CARTRIDGE FOR A PRINTER SYSTEM

Abstract: A cartridge for a printer system for storing a paper and an ink film (36) comprises an ink film storing part (32, 321) provided at a front side of the cartridge for holding a first roll (34, 332) of ink film and a second roll (35, 333) of ink film immediately behind the first roll so that the ink film is wound between the first and second rolls continuously and a paper storing part (33, 323) behind the ink film storing part for storing the paper therein as a form of a paper stack. The ink film storing part has a first opening (32c, 337) on a first side of the cartridge so as to allow taking out of the first roll of ink film from the cartridge through the first opening, and the paper storing part has a second opening (33a, 350) on a second side of the cartridge relative to the direction of insertion of the cartridge into the printer which is opposite to the first side so as to allow feeding of the paper from the cartridge through the second opening.

Description: The present invention generally relates to a cartridge for accommodating a paper and an ink film for printing, and particularly to a cartridge for use in a thermal imprint recording apparatus which records an image on the paper via the ink film on which a thermally melting or thermally sublimating ink is applied. Recently, thermal imprint type recording apparatus (printer) have been widely used for printing a computer graphics image and the like because of the simplicity of the mechanism, high recording speed, and ease of handling. A typical thermal imprint recording apparatus records predetermined information or a predetermined image on the recording paper by pressing a thermal head assembly on the recording paper via an ink tape or film carrying ink thereon, with the recording paper being placed on a platen roller which is rotated by a DC motor, pulse motor and the like. The thermal head assembly comprises a group of thermal elements arranged in a row along the longitudinal direction of the platen roller as well as in the lateral direction of the recording paper. Such a linearly configured thermal head system appropriately controls current supplied to each of the thermal elements and prints a single line portion of the information at a time. Thereafter, the platen roller is rotated and the recording of the subsequent line is performed. By repeating this sequence, colour image information such as a predetermined script or picture is recorded in a sequence of lines on the recording paper. The ink film may be constructed such that coloured ink of three primary colours, yellow (Y), magenta (M), and cyan (C) is deposited with a predetermined form on a base film. According to the need, a fourth colour of black (B) may be included. When using such an ink film for the imprint recording, the imprint recording is performed by mechanically setting a predetermined positional relationship between a first colour ink part on the ink film and the recording paper, and then bringing the two into contact with one another and performing the imprint recording. After the first colour of the ink has been printed, the ink film is fed so as to set a predetermined positional relationship between colour ink part on the ink film and the recording paper which is maintained stationary, and then the paper and the ink film are brought into contact with one another and the imprint recording is performed. Thereafter, by repeating the operation as described above for the remaining colours of the ink on the ink film, the desired colour printing is completed. Each time the thermal imprint recording apparatus performs the imprint recording, the ink of the ink film is consumed. Therefore, a roll of ink film and a stack of the recording paper are prepared as a first supply, but these supplies still need to be replenished after being consumed. In order to smoothly perform the resupplying of the above materials, a unitary type cartridge has been proposed in which an ink film housing and a recording paper housing are unitarily constructed. That is, the unitary type cartridge is made so as to allow checking of the consumption of the recording paper and the ink film and of the need for a new supply of the ink film or the recording paper. Thus, one can find if there is an approaching shortage of the recording paper or the ink film before they are fully consumed, so that the user can supply the recording paper or change the ink film before all of these materials are consumed. However, the prior art cartridges proposed heretofore have a construction such that, when the cartridge is loaded on the printer, the ink film to be loaded on the platen roller is drawn out from an upper side of the cartridge and the paper accommodated in the cartridge is also taken out from the upper side of the cartridge through an opening provided on the upper side. As the paper has to be fed between the platen roller of the printer and the ink film loaded on the platen roller, the paper is inevitably supplied through a circuitous path which goes around the path of the ink film as well as the thermal head assembly provided adjacent to the platen roller. As a result, the printer has to be made larger. Further, in such a construction of the cartridge, there is a tendency that dust will intrude into the cartridge through the opening at the upper side of the cartridge. Such dust deteriorates the quality of recording when it accumulates on the paper in the cartridge. JP-A-62 151 367 discloses a cartridge for a printer system having the features defined in the preamble of the appended Claim 1. According to the invention, there is provided a cartridge as defined in the appended Claim 1. Preferred embodiments of the invention are defined in the other appended claims. It is thus possible to provide a cartridge of a thermal imprint recording apparatus for accommodating a recording paper and a roll of ink film wherein the ink film and the recording paper are taken out from the cartridge from opposite sides of a body of the cartridge. The path of the ink film from the cartridge to a platen roller of a printer and the path of the paper from the cartridge to the platen roller are formed in the printer at respectively opposite sides from each other when the cartridge is loaded on the printer. As a result, the path of the paper and the path of the ink film are simplified and the printer co-operating with such a cartridge can be constructed compactly. It is also possible to provide a cartridge of a printer for accommodating an ink film and a paper on which recording of an image is made by the ink film comprising a first cover for closing a first opening of the cartridge from which the ink film is drawn out and a second cover for closing a second opening of the cartridge from which the paper is taken out when the cartridge is not loaded on a printer. Further, the cartridge is constructed such that the first and second covers are displaced responsive to the loading of the cartridge on the printer and the first and second openings are exposed. The penetration of dust into the cartridge is prevented and the adverse effect on the printing due to the dust is positively prevented. The present invention will be further described, by way of example, with reference to the attached drawings, in which: FIG.1 is a diagram showing a prior art cartridge used in a prior art thermal imprint recording apparatus for accommodating an ink film and a paper; FIGS.2(A) - (C) are respectively a bottom view, side view and a cross sectional view taken along a line II c - II c of FIG.2(A) showing a first embodiment of the cartridge of the present invention; FIG.3 is a schematical view showing the cartridge of FIG.2(A) in relation to the apparatus; FIG.4 is a perspective view of a roll of ink film wrapped around a core; FIG.5 is a perspective view showing a modification of the core; FIGS.6(A) and (B) are partial sectional views showing a procedure in which a take-up roll for taking up the ink film is mounted on the cartridge; FIG.7 is a partially enlarged view showing a part for driving a supply roll; FIGS.8(A) and (B) are partially enlarged views showing a procedure for mounting the supply roll on the cartridge; FIG.9 is an enlarged view showing a finger for holding the paper in the cartridge; FIG.10 is a partially enlarged view showing the engagement of a lid with the cartridge; FIG.11 is a perspective view showing the internal construction of the apparatus to which the cartridge of FIG.2(A) is applicable; FIG.12 is a perspective view showing the recording apparatus of FIG.11 together with the cartridge at the time of loading; FIG.13 is an enlarged view showing a mechanism for feeding and taking up the ink film; FIG.14 is a perspective view showing a mechanism for driving a platen roller; FIG.15 is a perspective view showing a mechanism for feeding and discharging paper on and from the platen roller of FIG.14; FIG.16 is a perspective view showing a guide mechanism for guiding the recording paper; FIG.17 is a schematical view showing a driving mechanism for driving a shaft used to drive a take up roll of the ink film shown in FIG.4; FIG.18 is a perspective view showing a mechanism for displacing a thermal head; FIGS.19(A) and (B) are views showing a mechanism for controlling the engagement of a drive shaft with a take up roll of the ink film; FIG.20 is a view showing the construction of the interior of the platen roller; FIG.21 is a sectional view of the platen roller; FIGS.22, 23, and 24 are side views showing the operation of the thermal imprint recording apparatus accompanying the movement of the take-up roll within the cartridge; FIGS.25(A) and (B) are side views of the thermal imprint recording apparatus showing another embodiment of the arms carrying the take up roll; FIG.26 is a side view of the cartridge showing the operation for feeding a paper; FIGS.27(A) through (D) are side views showing modifications of the mechanism for driving the take-up roll in four different states; FIG.28 is a side view showing the locking mechanism of the cartridge; FIG.29 is a cross sectional view showing a modification of the cartridge; FIG. 30 is a diagram showing a second embodiment of the cartridge of the present invention; FIGS.31(A) and (B) are respectively a bottom view and a side view showing a third embodiment of the cartridge of the present invention in a state prior to its insertion into the printer; FIGS.32(A) and (B) are respectively a bottom view and a side view showing the cartridge of FIG.31(A) in a loaded state; FIG.33 is a perspective view showing a fourth embodiment of the present invention; FIG.34 is a cross sectional view of the cartridge of FIG.33; FIG. 35 is a perspective view showing the cartridge of FIG.33 in a state in which a lid thereof is opened; FIG.36 is a diagram showing a mechanism for locking the lid of the cartridge of FIG.33; FIG.37 is a perspective view showing the cartridge of FIG.33 from a bottom side; FIG.38 is a perspective view showing a fifth embodiment of the cartridge of the present invention from its bottom side; FIG.39 is a side view showing the mechanism of a thermal imprint recording apparatus on which the cartridges of FIG.33 and FIG.38 are loaded; FIGS.40 - 43 are diagrams similar to FIG.39 showing the operation of the apparatus of FIG.39; FIG.44 is a perspective view showing a detector used in the apparatus of FIG.39; FIG.45 is a side view showing a sixth embodiment of the cartridge of the present invention; and FIG.46 is a side view similar to FIG.45 showing a seventh embodiment of the cartridge of the present invention. FIG.1 shows a prior art thermal imprint recording apparatus (hereinafter referred to as printer) disclosed in the Japanese Laid-open Utility Model Application No.97765/1987. Referring to the drawing, the printer uses a cartridge 11 comprising a recording paper accommodating a part 14 in which a stack of recording papers 16 are accommodated, and a roll holding part adapted to hold a supply roll 7 of an ink film 12 carrying a thermally melting ink thereon. The printer on the other hand comprises a platen roller 13 on which the recording paper 16 is fed from the recording paper accommodating part 14 of the cartridge 11 along a supply path 18, and a recording is made by pressing a thermal head 17 on the recording paper 16 via the ink film 12 which in turn is fed from the supply roll 7 on the cartridge 11. The ink film 12 is taken up by a take up reel 8 held rotatably on a swing lever 10. The swing lever 10 is held rotatably on an axis coincident to the axis of the platen roller 13. Thus, when feeding the ink film 12 from the supply roll 7, the lever 10 carrying the take up roll 8 is swung in the clockwise direction about its axis and the ink film 12 is drawn out along an upper side of the platen roller 13. Thus, the paper 16 fed along the path 18 is held between the platen roller 13 and the ink film 12, and printing is made by the thermal head 17 which selectively applies heat to the ink film 12 held on the paper 16 on the platen roller 13. When the printing is completed, the platen roller 13 is rotated in a reversed direction and the paper 16 is discharged along a path 20. In this prior art printer, the recording paper accommodating part 14 of the cartridge 11 has an opening 15 formed on its upper surface, and the recording paper 16 is loaded within the recording paper accommodating part 14 through this opening 15. At the time of printing, the recording paper 16 is fed from the opening 15 and is transported around the circuitous path 18 running around the thermal head 17 and a take-up gear 19 provided to drive the take up roll of the ink film. It should be noted that this circuitous path 18 becomes inevitably large as there is no way of bringing the paper 16 directly to the platen roller 13 across the path of the ink film 12. Therefore, there is a problem that the printer which performs the above described operation is large in size and has a complicated construction. FIGS.2(A) through (C) show a preferred embodiment of the cartridge applicable to the printer of the present invention in which FIG.2(A) is a bottom view, FIG.2(B) is a side view showing the cartridge of FIG.2(A) as seen from the right, and FIG.2(C) is a sectional view taken along a line II C -II C in FIG.2(A). Further, FIG.3 is a schematical diagram showing the fundamental relationship between the printer and the cartridge of the present invention. Referring to FIGS.2(A) through (C) and FIG.3, a cartridge 30 comprises a cartridge body 31 on which an ink roll holding part 32 is provided at its front end. In this part 32, a supply roll 35 for supplying the ink film 36 and a take-up roll 34 for taking up the ink film 36 are held rotatably. Further, a recording paper accommodating part 33 is provided on the cartridge body 31 at its rear part away from the ink roll holding part 32. The cartridge 30 is loaded into a printer to be described later in a horizontal state such that the end of the cartridge body 31 carrying the ink roll holding part 32 is loaded first into the printer. Further, the cartridge 30 is loaded in such a direction that the recording paper is supplied in a downward direction from the bottom of the cartridge 30. Thereafter, as shown in FIG.3, arms 96a and 96b held rotatably on a shaft 92, on which a platen roller 93 is also held, is rotated in a clockwise direction so as to move the take up roll 34 away from the recording paper housing while maintaining a state in which the take-up roll 34 is engaged with U-shaped cutout portions 96a₁ and 96b₁ of the arms 96a and 96b. Thus, the take-up roll 34 is moved out of the cartridge 30, passes through a first opening 32c shown in FIG.2C, and is separated from the cartridge 30. As a result of the movement of the arms 96a and 96b, the ink film 36 is thus passed over the platen roller 93. When the arms 96a and 96b are fully moved in the clockwise direction, the take-up roll 34 is engaged with a take-up driving mechanism comprising gears 136 and 137 in the printer and is thus rotated by the take-up driving mechanism. Thus, the ink film is further taken up on the take-up roll 34 in response to the rotation of the gears 136 and 137. A description will now be given of the details of the construction of the cartridge 30 with reference to FIGS.2(A) through (C). The ink roll holding part 32 of the cartridge body 31 has a substantially U-shaped frame portion such that a pair of arms 32a and 32b constitute the U-shaped portion and the arms extend toward a front end of the cartridge body 31. The paper accommodating part 33 is constructed to have a generally rectangular shape and is provided adjacent to the ink roll holding part 32. Further, the recording paper accommodating part 33 has an opening 33a provided at a lower portion thereof so as to enable supplying of the recording paper from a bottom surface 31a of the cartridge body 31. Further, a pair of ribs 50 and 51 are formed along respective side surfaces 31c and 31d of the cartridge body 31, and these ribs act as a guide member at the time of insertion of the cartridge 30 into the printer. Further, the ribs 50 and 51 are provided at different heights with respect to one another on the respective side surfaces 31c and 31d in order to prevent erroneous insertion so that the insertion of the cartridges reversed into the printer is positively prevented. Thus when the cartridge 30 is correctly loaded at a proper angle of insertion into the printer, the ribs 50 and 51 are correctly engaged with respective grooves provided in the printer and thus the inserting operation is permitted. Further, T-shaped stoppers 50a and 51a are respectively provided at the end of the ribs 50 and 51 close to the rear end of the cartridge 30. Thus, by contacting with respective tip ends of the grooves, the stoppers 50a and 51a determine the position of the cartridge 30 relative to the printer in which the cartridge is fully inserted. During this state, the rear end of the cartridge 30 is substantially flush with the front panel of the printer. As already described, the take-up roll 34 and the supply roll 35 wound with the ink film 36 are rotatably held between the arms 32a and 32b with a predetermined separation from one another. In the description hereinafter, the distance between respective rotational axes of the take-up roll 34 and supply roll 35 is designated as P , and the distance P is selected to be as small as possible, provided that the ink film wound on each of the cores do not touch one another. The take-up roll 34 is mounted from the top of the cartridge body 31 whereas the supply roll 35 is mounted from a bottom of the cartridge body 31. Such a construction is used in correspondence with the construction of the cartridge 30 such that the take-up roll 34 is drawn out from a top side 31b (FIG.2(C)) of the cartridge body 31 which in turn is inserted into the printer with the recording paper to be fed out from a bottom side 31a (FIG.2(C)). As shown in FIG.4, the take-up roll 34 (or the supply roll 35) has the ink film 36 wound on a core 37 of a predetermined length L1 formed from a hollow cylinder made of metal, plastic and the like. The ink film 36 comprises a polyester film base of a width L2 less than the length L1 and on which different colours of a thermal melting type ink or a thermal sublimation type ink are sequentially painted with a predetermined pattern. Typically, yellow (Y), magenta (M), cyan (C), and, optionally, black (B) are used for colour printing. Further, the take-up roll 34 carries the ink film 36 wound thereon such that the ink surface faces inwards. By doing so, deposition of dust, fingerprints, and the like on the ink surface of the ink film 36 is prevented. On the film 36, black marks 36a, 36b, and 36c are formed in a longitudinal direction along one side portion of the ink film 36 in order to show the initial positions at which the formation or pattern of the ink of the respective colours Y , M , and C commence. Further, a black mark 36d is formed in the longitudinal direction along another side of the film 36 in order to show the initial position at which the formation of the ink of the first colour Y commences. On both ends of the core 37, a pair of slits 37a of a predetermined depth ℓ set so as to satisfy a relation (L1 - L2)/2 > ℓ and having a substantial V-shape diverging outwards is formed. By choosing the length ℓ as such, a margin ℓ₁ is formed at both the sides of the core 37 and it becomes possible to engage with arms 96a and 96b of the printer in this part. In this construction, neither end of the ink film 36 is wound onto the region of the grooves 37a, and the ink film 36 is wound uniformly onto the core 37 without occurrence of creases thereon. Thus it is possible to stably and reliably perform printing with high quality and gradation without causing damage to the ink film 36. As will be described later, the presence of the grooves 37a on the core 37 in the take-up side enables a smooth coupling with respective coupling portions 139 of the printer as shown in FIG.11, and the presence of the grooves 37a in the supply side takes up slackening of the ink film at the time the cartridge is ejected from the printer. Further, an internal circumferential portion at both ends of the core 37 has a predetermined rounded edge portion 37b in order to secure centering of the core 37 of the take up side when the take-up roll 34 is mounted on the cartridge 30 as illustrated in FIG.6(B). Further, the core 37 may have a cylindrical shape just at the end portions thereof and the portion of the core 37 which is wound with the ink film 36 may have a form other than a cylindrical shape. Furthermore, provided that the shape of the core 37 is the same for both the take up and supply rolls, then when the ink film 36 has been completely fed to the take up side, the core 37 of the supply side may be mounted on the take up side and used as the core of the take up side in place of the previous core 37. FIG.5 shows a modification of the core. A pair of flanges 38 are formed at the vicinity of opposing ends of the core 37 and are separated by a distance corresponding to the width of the ink film 36. The pair of flanges 38 act to ensure that the ink film 36 is correctly taken up on the core 37 without any deviation therealong. A description will now be given on the assembly of the take-up roll 34 and the supply roll 35 which have the respective cores 37 wound with or attached to the ink film 36, and also on the construction of the ink roll holding part 32, with reference to FIGS.6(A), (B) and FIG.7. As shown in FIG.2(A), a pair of mutually opposing guide grooves 39a and 39b are formed on the inner side of the arms 32a and 32b constituting the ink roll holding part 32. These guide grooves 39a and 39b extend upwards to the top side 31b of the cartridge body 31 and facilitate the insertion of the take up roll 34 therein at a forward position relative to the supply roll 35. Similarly, a pair of mutually opposing guide grooves 40a and 40b are formed on the inner side of the pair of arms 32a and 32b so as to extend up to the bottom side 31a of the cartridge body 31 and facilitate insertion of the supply roll 35 therein at a rearward position relative to the take-up roll 34. It will be noted that the guide grooves 39a and 39b have a predetermined arcuate shape corresponding to an arcuate path traced by the swinging motion of the lever of the printer to be described later so that the take-up roll 34 can be smoothly withdrawn from the guide grooves 39a and 39b by the lever. As shown in FIG.6(A), when inserting both ends of the core 37 of the take up roll 34 into the respective guide grooves 39a and 39b, both ends first come into contact with and deflect respective springs 42 which are fixed at one end to the arms 32a and 32b by screws 41. Thereafter the core 37 reaches a predetermined position of insertion where, as shown in FIG.6(B), the respective ends of the core 37 are rotatably fitted onto a circular shaped projection 42a forming a shaft receiving portion of the respective springs 42. Thus, the core 37 of the take up roll 34 is held flexibly at both ends by the springs 42. Accordingly, when loading the recording paper into the recording paper accommodating part 33 of the cartridge body 31, the take up roll 34 is not displaced from its inserted position because of the resiliency of the spring 42. On the other hand, the force applied by the movement of the arms 96a and 96b of the printer to be described later to the take up roll 34 is sufficient to remove the take up roll 34 from its elastically held state between the projections 42a. The supply roll 35, on the other hand, is inserted from the bottom surface 31a of the cartridge body 31 into the guide grooves 40a and 40b on the arms 32a and 32b respectively. Within the guide groove 40a of the arm 32a, a drive gear 43 is rotatably mounted on a shaft 44 as shown in FIG.7. On the gear 43, a coupling portion 46 is provided with projections 45₁ and 45₂ for engagement with the slots 37a of the core 37 and with the outer end of the core 37 . Furthermore, a coil spring 47 having a conical form is provided between the arm 32a and the drive gear 43 so as to urge the gear 43 in a direction Q1. Thus, the supply roll 35 having the core 37 wound with the ink film 36 is inserted into the guide grooves 40a and 40b, and one end of the core 37 is engaged with the coupling portion 46 of the drive gear 43 as shown in FIG.8A. Further, as a result of the engagement, the drive gear 43 is displaced in a direction Q2 against the force exerted by the spring 47. Thereafter, as shown in FIG.8(B), the other end of the core 37 is engaged with a fixed shaft-receiving portion 49 made of a material having a high wear resistance such as a polyester resin and which is fixed by a screw 48 within the guide groove 40b of the arm 32b. Thereby, the supply roll 35 is flexibly held between the arms 32a and 32b, with the coil spring 47 applying a force in the axial direction Q1. Due to the force applied by the coil spring 47, there is a friction µ₁ occurring between the coil spring 47 and the drive gear 43, and also a friction µ₂ occurring between the shaft 37 of the supply roll 35 and the fixed shaft receiving portion 49. Due to these frictional resistances, the chance of the ink patterns overrunning a predetermined position is prevented when the ink film 36 is pulled to the position and a loss of tension resulting in slackness which may otherwise develope is eliminated. Thus, a high quality of recording is ensured. The maximum diameter of the rolls 34 and 35 held in the ink roll holding part 32 is chosen so that the rolls 34 and 35 do not project beyond the cartridge body 31. A description will now be given of the construction of the recording paper accommodating part 33 with reference to FIGS.2(A) through (C). Referring to the drawings, the recording paper accommodating part 33 having a generally rectangular opening 33a in a bottom 31a has a holding portion 52 at its rear end so it can be held by the user at the time of insertion or removal of the cartridge 30. The holding portion 52 has a recess opened toward the bottom 31a of the cartridge body 31. When supplying recording papers 55 having a width slightly greater than that of the ink film 36, the paper is inserted into the opening 33a. Then, the paper is guided by a pair of guide portions 53 and 54 provided on the left and right of the recording paper accommodating part 33 so as to restrict movement of the recording papers 55. The guide portions 53 and 54 may be formed by press moulding or the like. Further, a pair of stopper ribs 56 and 57 are provided to the rear of the recording paper guide portions 53 and 54 respectively. The stopper ribs 56 and 57 cooperate with the stoppers 50a and 51a respectively and reinforce the cartridge body 31. The cartridge body may be moulded of plastic or fibre (paper), of which the latter is preferable for disposal. As shown in FIG.9, a tip end portion of the recording paper guide portion 53 is unitarily formed of a front lip 53a extending perpendicularly to the recording paper guide portion 53 and a finger 53b formed at a top edge of the front lip 53a. The recording paper guide portion 54 has a tip end portion of the same construction which is unitarily formed of a front lip 54a and a finger 54b which is identical to the finger 53b respectively. The fingers 53b and 54b are provided in order to engage with a front end portion of the recording paper 55. A portion of the finger 53b indicated by hatching in FIG.9 is polished so that it is ensured that any undesirable burr formed as a result of moulding and the like are removed. Similarly, a portion of the finger 54b is polished with the same degree of finishing. As shown in FIG.2(C), the finger 53b is oriented at a slightly inclined angle α with respect to the bottom surface 31a of the cartridge body 31. As a result of the inclined angle and the finish given to the fingers 53b and 54b, the recording paper can be supplied to the printer with ease. On the inner sides of the guide portions 53 and 54, a movable tray 61 (FIG.2(C)) is provided. This movable tray 61 has pivot pins 59 and 60 on either side at a position close to a top plate 58 of the cartridge body 31 and located between a rear end of the recording paper guide portions 53 and 54 and the respective ribs 56 and 57. Further, the movable tray 61 is urged in a direction M in FIG.2(C) by a coil spring 63 positioned between a projection 62 on the movable tray 61 and a depression 58a provided in the upper wall 58. Thus, a plurality of sheets of the recording paper 55 placed on the movable tray 61 are urged by the force exerted by the coil spring 63 toward the fingers 53b and 54b. By fitting the coil spring 63 in the manner described above, it is ensured that the coil spring 63 will not move from its seated position and that no noise is generated during compression and expansion of the coil spring 63. Further, the height of the conical shape spring 63 in a fully compressed state is equal to the thickness of the spring wire thereof, and thus the coil spring 63 can be compressed until the upper wall 58 and the movable tray 61 are in mutual contact. As a result, it is possible to insert a plurality of the recording paper 55 stacked up to a thickness approaching the thickness of the cartridge body 31 itself. By setting the number of the papers 55 held in the recording paper accommodating part 33 such that the number of papers coincides with the number of groups of the primary colour ink patterns or frames provided on the film 36, it is possible to make sure that the moment at which the recording paper 55 is used up and the moment in which the ink film 36 is used up occur at the same time. In such a case, one can simply replace the cartridge with a new one when replenishing the paper and the film, and can discard the old one. It should be noted that one paper corresponds to one ink pattern of the ink film 36 for printing a monochrome image in one colour, while in the case of colour printing, a group of ink patterns having respectively the three primary colours Y , M and C (and optionally black) corresponds to one image or picture frame to be printed on one sheet of the recording paper. FIG.2(A) further shows a lid member 64 which is provided rotatably around pins 65 and 66 provided at a rear part of the opening 33a of the recording paper accommodating part 33 so as to close the opening 33a. The lid member 64 carries a pair of elastically deformable fingers 64a extending laterally on its front end. As can be seen in the enlarged view in FIG.10, each of the fingers 64a is engaged with a cutout 67 formed on the cartridge body 31 by deforming resiliently. Thus, the lid member 64 is locked when it is closed and accidental dropping out of the paper 55 from the cartridge 30 is positively prevented. FIG.2(C) further shows a friction sheet 68 made of a material such as cork and disposed centrally at an upper surface of the movable tray 61 at a position close to the front end of the tray 61. This friction sheet 68 prevents the feeding of the paper 55 in an overlapped state and ensures that the last paper in the recording paper accommodating part 33 is reliably fed to the printer. The coefficient of friction of the friction sheet 68 is determined so as to satisfy a relation a > b > c, where a stands for the friction between a paper feed roller to be described and the recording paper 55, b stands for the friction between the recording paper and the friction sheet 68, and c stands for the friction between recording papers stacked on each other in the recording paper accommodating part 33 of the cartridge 30. In order to realize such a relation, the spring constant of the conically shape spring 63 is adjusted. Further, by the use of the fingers 53b and 54b having the inclined angle α which is set to 5 - 15 degrees downwards, the separation of the paper from the stack of the papers in the recording paper accommodating part 33 is performed with excellent reliability. Furthermore, as will be described later, the paper 55 fed to the printer is printed with images on the side which is opposite to the side on which the paper feed roller is engaged. Thus, the surface of the paper carrying the images is not messed up even if slipping occurs between the paper 55 and the paper feed roller. Further, as the printing is made on the lower side of the paper stacked and accommodated in the recording paper accommodating part 33 of the cartridge, the deposition of dust or fingerprints on the recording surface of the papers in the uppermost layer of the stack of paper is prevented and excellent printing can be maintained up to the last of the papers in the cartridge 30. Referring to FIG.2(A), again, an elongated hole 69 is provided at a front part of the movable tray 61. When the cartridge 30 is loaded into the printer and the paper 55 in the cartridge 30 is completely used up, a photo sensor provided on the printer so as to face the hole 69 ceases to detect the reflection of light from the paper 55 in the cartridge 30, and the printer is stopped. At the same time, a warning lamp indicating the need to replenish the paper is illuminated. For this purpose, the cartridge 31 may be applied with a suitable surface coating and the like to eliminate reflection of light from the body of the cartridge. Next, a description will be given of the printer designed to use the cartridge 30 as described heretofore with reference to FIGS.11 through 24. Referring to FIG.12, a printer 80 has an insertion opening 81 on its front panel for accepting the insertion of the cartridge 30. As a result of the loading operation, the cartridge 30 is accommodated in a space 83 defined in the body of the printer 80. It should be noted that the cartridge is inserted into the printer 80 as shown by an arrow D₁ in such a state that the opening 33a of the cartridge 30 faces downwards and that the ink roll holding part 32 of the cartridge 30 is inserted first. At the time of loading, the ribs 50 and 51 provided on the side walls of the cartridge body 31 are engaged with guide grooves 91a and 91b and the cartridge 30 is loaded smoothly. In the loaded state, the cartridge 30 is urged by a spring member 95 (FIG.11) provided in the guide groove 91b toward the guide groove 91a and the cartridge 30 is thus restricted from movement in the lateral direction. As a result, the cartridge 30 is directed properly to the printer 80 and zigzag movement of the paper 55 fed from the cartridge 30 is prevented. Thus, the paper 55 is fed from the cartridge 30 with excellent reliability. In the fully loaded state, it is noted that the stoppers 50a and 51a (FIG.11) are abutted to the end of the guide grooves 91a and 91b. FIG.12 further shows a cutout 84 formed at a portion of the printer 80 located below the insertion opening 83 so that the user can easily draw out the cartridge 30 from the printer 80 at the time of unloading the cartridge. It should be noted that the rear end of the cartridge 30 becomes flush with the front panel 82 of the printer 80. In case the user of the printer 80 has loaded the cartridge 30 upside down, the insertion of the cartridge is prevented because the ribs 50 and 51 are provided on the body of the cartridge with a mutually asymmetric state and also because the rib 50 cannot be engaged with the opposite groove 91b and the rib 51 cannot be engaged with the opposite groove 91a. When the cartridge 30 properly loaded into the printer 80 has reached a predetermined fully loaded state in which the cartridge 30 is fully inserted into the printer 80, a switch SW1 disposed in the printer so as to face a slope 50b formed at the front end of the rib 50 is closed by the movement of the rib 50, and responsive thereto, the take up roll 34 is transferred from the cartridge 30 to a predetermined position in the printer 80 and the printer 80 becomes ready for printing. More specifically, responsive to the loading of the cartridge 30 on the printer 80, both ends of the core 37 of the take up roll 34 are transported to responsive sides of a platen roller 93 which is held rotatably on the printer 80 around a rotational shaft 92. In this state, the core 37 is held in the U-shaped portions 96a₁ and 96b₁ formed at an end of arms 96a and 96b which are provided integral with drive gears 94a and 94b which in turn are provided so as to rotate around the shaft 92 of the platen roller 93 (see FIG.22). In order to assure the proper engagement between the arms 96a, 96b and the core 37 of the take up roll 34, the U-shaped portion 96a₁ is configured such that the distance m₁, between the portion 96a₁ and the switch SW1 and the distance m₂ between the centre of the take up roll 34 in the cartridge 30 and the slope 50b at the front end of the rib 50 are kept identical. Further, the arm 96a is abutted with an L-shaped stopper 97 provided in the printer so as to restrict the movement of the arm 96a. Thus, the position of the arms 96a and 96b is determined unambiguously at the time of insertion of the cartridge 30. Therefore, the take up roll 34 is accepted into the U-shaped opening 96a₁ and 96b₁ securely and the possibility of improper engagement is eliminated. It is noted that the openings 96a₁ and 96b₁ are configured such that the lower edge of an upper leg defining the openings 96a and 96b is made flat and the upper edge of a lower leg defining these openings 96a and 96b has a hook. Further, the entrances to the openings 96a₁ and 96b₁ are made narrower as compared to the insides of the openings. Actually, these entrances are made slightly narrower than the outer diameter of the core 37 of the take up roll 34, and the upper leg and the lower leg defining the openings 96a₁ and 96b₁ are made of a resilient material. As a result, the entrances of the U-shaped openings 96a₁ and 96b₁ are expanded elastically when the core 37 is inserted into the openings. It should be noted that this resiliency of the U-shaped openings may be obtained by constructing the arms 96a and 96b of a resilient metal or by forming the U-shaped openings 96a₁ and 96b₁ in separate resilient plastic bodies and mounting them at the end of each of the arms 96a and 96b. Further, the construction of the U-shaped openings may be any known construction as long as the arms are deformed elastically in response to the insertion of the core 37 and as long as the core 37 is held rotatably in the openings 96a₁ and 96b₁. FIGS.25(A) and (B) show another embodiment of the arms 96a and 96b for holding the take up roll 34. In the drawing, only one of the arms, 96b, is shown as the construction of the arm 96a is identical to that of the arm 96b. Referring to the drawing, the arm 96b is made of a metal and the U-shaped opening 96b₁ comprises a horizontal part 96b₂ and a catch 96b₃ provided rotatably on the arm 96b. The catch 96b₃ is held rotatably on the arm 96b by a pin 104 and is urged in the clockwise direction to close the entrance to the U-shaped opening 96b₁ by a spring 106 wound around the pin 104 and having one end abutted to the catch 96b₃ and the other end engaged with a pin 105. Thus, when carrying the take up roll 34 on the arm 96b at the time of insertion of the cartridge 30 on the printer 80, a projection at the base of the catch 96b₃ is first engaged with the stopper 97 of the printer 80 and the catch 96b₃ is rotated in the counter clockwise direction against the force of the spring 106. Thus, the entrance of the core 37 into the opening 96b₁ is allowed. In this procedure, the position of the arm 96b is restricted by the stopper 97 and at the same time the U-shaped opening 96b₁ is opened. On the other hand, after the insertion of the cartridge 30 into the apparatus 80 is completed and the arm 96b is rotated, the entrance to the U-shaped opening 96b₁ is closed as the catch 96b₃ is rotated clockwise by the urging force of the spring 106. Thus, the core 37 of the take up roll 34 is securely held in the depression formed in the catch 96b₃ and an accident such that the roll is disengaged from the arm 96b and falls during the transport of the roller 34 is positively prevented. Referring to FIG.11 again, the position of the arm 96a is restricted by the stopper 97, and in this state, the arm 96a closes a switch SW2 by a pin 98 carried by the arm 96a. Further, in this horizontal state of the arm 96a, the U-shaped opening 96a₁ is opened so as to allow entrance of the cartridge 30. When the arm 96a is rotated to a state shown by a two-dotted line shown in FIG.11 by a motor 99, the pin 98 closes the switch SW3 and the motor 99 is deenergized. The positions of the switches SW2 and SW3 are determined such that they are located slightly offset against the direction of movement of the arm 96a relative to the stationary position of the arm 96a so as to compensate for the effect of inertia of the arm. Further, the positions of the switches SW2 and SW3 are adjustable at the time of assembling the printer 80. Furthermore, it is noted that the effect of inertia of the motor 99 can be eliminated even in such a case that the arm 96a contacts with the stopper 97 violently by providing a known slip clutch mechanism between the motor 99 and a gear 100 on the output shaft of the motor 99 so as to absorb the effect of inertia of the motor 99. Such a construction is preferable in order to realize a stable and reliable movement of the arm 96a. Responsive to the completion of the loading of the cartridge 30 in the printer 80, the arm motor 99 is energized by the closure of the switch SW1. Responsive to the rotation of the arm motor 99 carrying the gear 100, a gear 101 meshing with the gear 100 is rotated and responsive to the rotation of the gear 101, the aforementioned drive gear 94a is rotated. The gear 94a carries the shaft 92 and the arms 96a and 96b are rotated responsive to the rotation of the gear 94a around the shaft 92. It should be noted that another gear 103 is connected to the gear 101 by a shaft 102 so as to rotate unitarily with the gear 101, and the other drive gear 94b is engaged with the gear 103. Thus, responsive to the movement of the arm 96a driven by, the gear 94a, the arm 96b is moved simultaneously with the same speed by the gear 94b. It is obvious that one can use optically triggered switches in place of the switches SW1 - SW3. Responsive to the rotation of the drive gears 94a and 94b, the arms 96a and 96b are rotated in the counter clockwise direction and the take up roll 34 carried at the end or the arms is removed from the ink roll holding part 32 of the cartridge 30. Thus, responsive to the rotation of the arms 96a and 96b, the take up roll 34 is transported along the arcuate guide grooves 39a and 39b of the cartridge 30 and is separated from the guide grooves through the opening 32c of the ink roll holding part 32. When the cartridge 30 is inserted into the printer 80, the gear 43 which rotates unitarily with the supply roll 35 is meshed with a drive gear 108 of a take up mechanism 107 for taking up the ink film on the core 37. In the description hereinafter, the construction of the take up mechanism 107 particularly at the time of removal of the cartridge 30 from the printer 80 will be described with reference to FIG.13. Referring to FIG.13, the drive gear 108 of the ink film take up mechanism 107 carries a gear 109 unitarily formed therewith and the gears 108 and 109 are held rotatably on a pin 111 provided on a guide member 110 which in turn is fixed on a frame 116 of the printer 80. Further, the drive gear 108 is meshed permanently with a gear 113 via an intermediate gear 112. The gears 108, 112 and 113 are held rotatably on respective pins 111, 114 and 115 fixed on the guide member 110. The gear 113, on the other hand, is held slidably on the pins 115 and carries a sleeve extending through a clamp lever 118 which is supported rotatably on a pin 117 provided on the guide member 110. Further, the sleeve is provided with a stopper 119 which is engaged with the clamper lever 118. The gear 113 is urged by a spring 120 fitted over the pin 115 between the gear 113 and the clamp lever 118. The clamp lever 118 has one end connected to an actuating rod 121a of a solenoid actuator 121 and another end for holding a slidable ring 122 fitted over the rotary shaft 92 of the platen roller 93. Thus, when the solenoid actuator 121 is actuated from a non-actuated state shown in FIG.13 by a solid line to an actuated state shown by a two-dotted line, the clamp lever 118 is rotated around the shaft 117 in the clockwise direction as shown by the two-dotted line. Responsive to the rotation of this clamp lever 118, the gear 113 is displaced to the left along the shaft 115 while maintaining engagement with the gear 112 by the force exerted by the spring 120. In this state, the gear 113 is meshed with the drive gear 94b of the arm 96b and the swinging motion of the arm 96b is transmitted to the gear 43 in the cartridge 30 via the gears 94b, 113 and 112. Thus, the gear 43 of the supply roll 35 is rotated backwards responsive to the movement of the arms 96a and 96b in the backward direction to return the take up roll 34 at the time of removal of the cartridge 30 from the printer 80. As a result of this operation, the ink film 36 which was drawn out previously from the cartridge 30 is re-wound on the supply roll 35 and the slackening of the film 36 at the time of returning the take up roll 34 to the cartridge 30 is eliminated. Further, as a result of rotation of the clamp lever 118, the slidable ring 122 is displaced so as to urge a clamp shaft 123 of the platen roller 93 in the direction shown by an arrow. As a result, the clamping of the paper is removed as will be described later and the discharge of the paper becomes possible. It should be noted that the rotation of the ring 122 is prevented by a pin 116a provided on the frame 116. Next, a description will be given of the detailed construction of the platen roller 93 with reference to FIGS. 20 and 21. Referring to FIG.20, the platen roller comprises a cylindrical member 124 and a rubber covering 125 which covers the periphery of the cylindrical member 124. Both of the ends of the cylindrical member 124 are closed by a pair of flanges 126, and the flanges 126 are fixed to the aforementioned rotary shaft 92. Further, the platen roller 93 comprises a clamper 127 which is provided so as to be movable in the radial direction of the cylindrical member 124. The clamper 127 has a projection 127a on its base part, and the projection 127a is engaged with a cam 128 formed on the aforementioned clamp shaft 123 extending through the cylindrical member 124. Thus, responsive to the movement of the clamp shaft 123 in the longitudinal direction of the cylindrical member 124, the clamper 127 is lifted outwards against an urging force exerted by a spring 131. Further, a leaf spring member is inserted between the clamper 127 and a stationary plate 129 fixed inside the cylindrical member 124 for absorbing any rattling of the clamper 127 in the circumferential direction. It can be seen that the clamper 127 further has a clamping part which is a bent portion formed at the outer end of the clamper 127. This clamping part has a curvature which is substantially coincident to the curvature of the platen roller 93 and holds the recording paper on the platen roller securely. As a result, the overlapped printing of images with different colors on the same recording paper for color printing can be performed with high precision and high reliability. In order to hold the paper on the platen roller 93 with increased engaging force, one may provide minute projections on the radially inner surface of the clamping part of the clamper 127. Next, the operation for displacing the thermal head and for driving the take up mechanism of the printer at the time of transportation of the take up roll 35 by the arms 96a and 96b will be described with reference to FIGS.17 - 19(B). Referring to FIG.17, a motor 132 is used to drive the ink film 36 as well as to displace the thermal head away from the platen roller at the time of loading the ink film 36 on the platen roller 93. The rotation of the motor 132 is transmitted to a drive shaft 138 for driving the core 37 of the take up roll 34 via a gear 134 carried on an output shaft 133 of the motor 132, a gear 135 permanently meshed with the gear 134, a gear 136 provided unitarily with the gear 135, and a gear 137 permanently meshed with the gear 136. The gears 136 and 137 are the same gears 137 and 137 described with reference to FIG.3. At the end of the shaft 138, there is provided a coupling member 139 so as to engage with the core 37 of the take up roll 34. Further, a corresponding coupling member 139' is provided so as to hold the core 37 between the coupling member 139 and the coupling member 139'. The shaft 138 is further constructed so as to be movable in the directions as indicated by arrows in FIG.17. Therefore, the shaft 138 can be displaced towards the left when replacing the ink film 36 so that the core 37 is disengaged from the shaft 138. It should be noted that in this displaced state, a gear 140 which is formed unitarily with the gear 137 is engaged with a gear 141 which in turn is meshed with a gear 142 used for displacing a thermal head 143. It will be noted that the gear 142 is carried by a shaft 144 which is connected to a mounting base 158 of the thermal head 143. Thus, in the state in which the shaft 138 for driving the take up roll 34 is displaced towards the right in FIG.17, the rotation of the motor 132 is transmitted to the take up roll 34 and the ink film 36 is wound on the roll 34. Thus, the film 36 is transported across the platen roller 93 as will be described. In this state, the gear 140 and the gear 141 are disengaged and the thermal head 143 is not displaced from its normal position adjacent to the platen roller 93. On the contrary, in the state in which the drive shaft 138 is displaced towards the left in FIG.17, the rotation of the motor 132 is not transmitted to the core 37 of the take up roll 34 but is transmitted to the shaft 144 as a result of meshing of the gear 140 with the gear 141. As a result, the thermal head 143 is displaced from the normal position adjacent to the platen roller 93 responsive to the rotation of the shaft 144. FIGS.18, 19(A) and (B) show a mechanism for displacing the drive shaft 138 of the take up roll 34. Referring to the drawings, an actuator core 146 of a solenoid 145 is displaced inwards responsive to a trigger signal supplied thereto commanding the displacement of the thermal head 143 from its normal position, and responsive treto, a moving plate 147 connected to the core 146 is displaced towards the solenoid 145 against an urging force by a spring 148. As a result, the lever 149 is rotated in the clockwise direction about a centre of rotation 150 of the lever 149. As the end of the drive shaft 138 is connected to the lever 149, the shaft 138 is displaced towards the left in FIG. 18 responsive to the rotation of the lever 149. Thus, the coupling member 139 and the take up roll 34 are disconnected. Further, responsive to the movement of the moving plate 147, a lever 151 which is disposed so as to oppose the lever 149 is rotated in the counter clockwise direction about a centre of rotation 152. As a result, the other coupling member 139 is displaced towards the right in the drawing, and the coupling member 139 is disconnected from the take up roll 34. Further, when the solenoid 145 is deenergized, the aforementioned parts are returned to the state shown in FIG.18 and FIG.19(A). FIG.18 further shows another lever 162 which is held rotatably about a shaft 162a. The lever 162 is held by adjusting screws 206a and 206b disposed above and below the ver 162 and the position of the shaft 144, in other words, the centre of rotation of the thermal head 143 is adjusted by the screws 206a and 206b. Thus, the position of the thermal head can be optimized relative to the platen roller 93 and a high quality printing becomes possible as a result of such optimization. FIGS. 22 - 24 show a rotary solenoid actuator 159 disposed behind the mounting base 158 of the thermal head 143. The solenoid actuator 159 carries an arm 160 on its rotary shaft 159a. As can be seen in FIG.24, the arm 160 is driven by the actuator 159 and urges the mounting base 158 of the thermal head 143 such that the thermal head is pressed on the surface of the paper 55 on the platen roller 93 via the ink film 36. Further, the mounting base 158 is returned to an unurged state shown in FIG.23 by a spring 161 when the actuator 159 is deenergized. In the printer 80 having a construction described heretofore, levers 149 and 151 are moved responsive to the energizing of the solenoid actuator 145 shown in FIG.18 when replacing the ink film 36, and responsive to the movement of the levers, the drive shaft 138 is displaced towards the left in FIG.18 and the core 37 of the take up roll 34 is disengaged from the coupling member 139. Further, responsive to the movement of the drive shaft 138 towards the left, the gears 141 and 142 shown in FIG. 17 are engaged, and the rotation of the motor 132 is transmitted to the shaft 144 via the gears 134, 135, 136, 137, 140, 151, and 142. As a result, the shaft 144 is rotated in the counter clockwise direction in FIGS.17 and 18. It should be noted that, in FIG.23, the shaft 144 is rotated in the clockwise direction since FIG.23 shows the printer seen from the opposite direction to FIGS.17 and 18. Thus, the thermal head 143 is displaced from the platen roller 93 as shown in FIG.22, and once the thermal head is displaced for a sufficient distance, this movement of the thermal head is detected by a means not illustrated, and the motor 132 is stopped. Next, the arms 96a and 96b are rotated in FIG.22 in the counter clockwise direction and the take up roll 34 is returned to the ink roll holding part 32 of the cartridge 30. When returning the take up roll 34 to the cartridge 30, the take up roll 35 is driven in the reversed direction by the aforementioned mechanism 107, and the ink film 36 is wound on the supply roll 35. After the removal of this old cartridge and insertion of a new cartridge 30 io the printer 80, the switch SW1 shown in FIG.11 is actuated and the motor 99 driving the arms 96a and 96b is energized. Thus, the arms 96a and 96b are rotated about the shaft 92 and the take up roll 34 is transported across the platen roller 93 to a predetermined loading position. As the take up roll 34 is moved across the platen roller 93, the ink film 36 is drawn over the platen roller 93 and the film 36 is partially wound around the platen roller 93. When the arm 96a reaches a predetermined position, the switch SW3 is actuated and the motor 99 is deenergized. During this movement of the arms, the thermal head is displaced away from the platen roller as shown in FIG.22. After the deenergizing of the motor 99, the motor 132 shown in FIG.17 is energized in the reverse direction and the drive shaft 144 is rotated in the counter clockwise direction in FIG.22. Thus, the thermal head 143 is moved to the normal position adjacent to the platen roller 143. This state is detected by a detection means not illustrated, and the motor 132 is deenergized. At the same time, the solenoid actuator 145 is deenergized and the coupling members 139 are returned so as to engage with the core 37 of the take up roll 34. Further, the engagement of the gears 140 and 141 is disconnected and the rotation of the motor 132 is transmitted to the take up roll 34 alone. Thus, the take up of the ink film is performed. Next, a mechanism for driving the platen roller 93 will be described with reference to FIG.14. In FIG.14, the rotary shaft 92 of the platen roller 93 carries a disk-shaped sensor plate 163. Further, the platen roller 93 is rotated by a D.C motor mounted on a mounting base 164 with a reduced speed reduced by a factor of several hundred times as compared to the rotational speed of the D.C. motor 165, by a reduction gear system 166 as well as by a belt a pulley mechanism comprising toothed pulley wheels 162, 167, and a belt 168 carrying teeth for engagement with the pulley wheels. The motor 165 carries a gear 165a on its output shaft, and a photo detecting mechanism 169 is provided adjacent to the gear 165a so as to detect the movement of the teeth on the gear 165a as a result of interruption of light by the teeth and produces an output pulse corresponding to the rotation of the gear 165a. The aforementioned sensor plate 163, on the other hand, has a slit 163a extending radially on the plate, and a photo detecting mechanism 170 is disposed on the mounting base 164 so as to detect the slit 163a during the rotation of the sensor plate 163. Thus, the photo detecting mechanism 170 produces an output signal indicating the rotational angle of the platen roller 93, and responsive to this output signal, the state of a paper feeding mechanism for feeding the recording paper 55 on the platen roller 93 is set. FIG.14 further shows a motor 171 for driving a drive shaft 173 of a feed roller to be described with a reduced speed via a reduction gear system 172. As can be seen in FIG.14, the drive mechanism of the platen roller is carried by the mounting base 164 which in turn is mounted on the frame 116 by a screw 174 such that the position of the mounting base 164 is adjusted by loosening and moving the base 164 relative to the frame 116. Thus, the position of the drive mechanism of the platen roller 93 on the frame 116 of the printer 80 is optimized. Next, a mechanism for feeding the paper on the platen roller and for discharging the paper from the platen roller will be described with reference to FIGS.15 and 16. Referring to FIG.15, a feed roller 175 is supported rotatably on a shaft 180 which is held in a frame 176 which iturn is held rotatably around the drive shaft 173. The feed roller 175 is driven by the motor 171 via the reduction gear system 172, the shaft 173 engaged with the gear system 172, and gears 177, 178 and 179. It should be noted that a gear 182 is fixed on the end of the shaft 173, and the gear 182 is meshed with a gear 185 for driving a discharge roller 184. When the feeding of recording paper is not performed, the feed roller 175 is engaged with a discharge roller 181 located below the feed roller 175 by its weight. Further, a roller 183 is provided above the discharge roller 184 such that the roller 183 is engaged with the discharge roller 184 by gravity. When feeding a paper on the platen roller 93 by driving the feed roller 175, an actuator rod 186a of a solenoid actuator is moved in the direction indicated in FIG.15 by an arrow e . Responsive to this movement of the rod 186a, a shaft 188 is pulled by a link 187 connected to the rod 186a, the frame 176 is rotated in the counter clockwise direction as indicated by an arrow f , and the feed roller 175 is engaged with the paper 55 in the stack of recording papers held in the cartridge 30 located above the feed ller 175 as shown in FIG.26. When the motor 171 is driven in this state, the feed roller 175 driven via the gears 177 and 178 makes contact with a paper located at the bottom of the stack and draws out the paper from the cartridge 30 as indicated by an arrow in FIG.26. This paper is then transported to the platen roller 93 by the feed roller 175. Further, the solenoid actuator 186 carries a spring 189 for returning the actuation rod 186a to its original position. When discharging paper from the platen roller 93, the solenoid actuator 186 is not energized and the motor 171 is driven in a same direction as the direction of driving at the time when feeding the paper. As a result, the paper 55 is transported in the direction indicated by an arrow g in FIG.15. Thus, the feed roller 175 is used not only for feeding the paper but also for discharging the paper and the mechanism for feeding the paper is simplified. Further, when supplying the paper manually one by one on the platen roller 93 when the cartridge is empty, the motor 171 is reversed without actuating the solenoid actuator 186. With this operation, the paper is transported to the platen roller 93 along the path of the paper at the time of discharging the paper in a reversed direction. Thus, the mechanism is simple and the printer can be constructed compactly as a result. Next, the transportation of the paper at the time of feeding will be described with reference to FIG.16. The paper 55 drawn out from the cartridge 30 against the action of the fingers 53b for holding the paper inside the cartridge is transported along a path which passes between a pair of guide plates 190 and 191 of a guide assembly 194 connected to each other by a link 193, and is guided along another guide plate 192 until it reaches the clamper 127 of the platen roller 93 which is opened so as to accept the paper between the clamping Portion of the clamper 127 and the platen roller 93. The guide assembly 194 is held rotatably on a shaft 195 provided on the frame 116 of the printer, and positioned by abutting with a stopper 196. The front end of the guide plate 191 is extended so as to cover more or less the platen roller 94 and the guide plate 191 is formed with a pair of elongated openings 191a provided so as to allow movement of the clamper 127 of the platen roller 93 in a radially outward direction from the platen roller 93. Further, the guide plate 191 carries a photo sensor 197 for detecting whether the recording paper 55 is securely held on the platen roller 93 by the clamper 127 or not. Further, the guide plate 191 carries guide rollers 198 and 199 for guiding the ink film 36 and a photo detector 200 for detecting a mark on the film 36 indicating the position for starting printing or position of the ink provided on the film 36. Furthermore, the front end of the guide plate 191 is formed with a pair of cutouts 191b, and in these cutouts, a roller 201 carried on a leaf spring 202 for pressing the paper on the platen roller 93 is provided. Next, operation of the printer 80 from the loading of the cartridge 30 to the feeding and discharging of the paper will be described. Referring to FIG.12, the cartridge 30 is inserted into the printer 80 through the insertion opening 81 such that the side of the cartridge 30 from which the recording paper is taken out is oriented downwards. The cartridge 30 is guided in the printer 80 by the guide grooves 91a and 91b shown in FIG.11 and reaches the fully loaded state in which the rear end of the cartridge 30 defines a flush surface with the front panel 82 of the printer 80. In this state, the core 37 of the take up roll 34 is engaged with the arms 96a and 96b and the slope 50b at the front end of the rib 50 actuates the switch SW1. Responsive to the actuation of the switch SW1, the motor 99 and the solenoid actuator 145 shown in FIGS.18 and FIGS.19(A) and (B) are energized and the thermal head 143 is moved away from the platen roller 93 as shown in FIG.22. Further, responsive to the rotation of the motor 99, the arms 96a and 96b carry the take up roll 34 and transport them away from the cartridge 30 as shown in FIG.22. When the arms are fully rotated, the pin 98 carried by the arm 96a actuates the switch SW3 and the motor 99 is deenergized. At the same time as the deenergizing of the motor 99, the solenoid actuator 145 is also deenergized and then the pair of coupling members 139 are engaged with the core 37 of the take up roll 34. Further, the drive shaft 138 is driven by the motor 132 and the ink film 36 engaging with the platen roller 93 is drawn out until the film 36 reaches a predetermined position ready for printing. The position of the film 36 on the platen roller 93 is detected by the photo detector 200 which detects the reflection of light from a predetermined marking on the film 36 such as the first inked part having the first color (yellow, for example) of the sequence of inked parts on the film 36, and responsive to the detection, the motor 132 is deenergized. With the preparatory operation as described, the printer 80 becomes ready for printing. It should be noted that, during this initial drawing out of the film 36, the supply roll 35 is applied with a suitable back tension by the urging force of the spring 47 (FIG.7) urging the gear 43, and the excessive unwinding of the roll 35 which eventually leads to the creasing of the ink film 36 is prevented. When the loading of the ink film 36 is completed, the thermal head 143, which has been moved away from the platen roller 93 to a position as shown in FIG.22 during the loading of the ink film 36, is moved towards the platen roller 93 as shown in FIG.23. In this state shown in FIG. 23, the feeding of the recording paper 55 is started responsive to the actuation of a start button (not shown) on the printer 80 commanding the start of printing. Thus, responsive to the actuation of the start button, the solenoid actuator 121 of the ink film take up mechanism 107 is actuated and the clamper 127 is released. Further, the feed roller 175 is displaced upwards by the operation of the solenoid actuator 186 shown in FIG.15 and is resiliently engaged with the recording paper 55 in the paper stack in the cartridge 30 as a result of the urging force of the conically configured spring 63 (see FIG.2(C)) in the cartridge 30. Further, the motor 171 is energized and the paper in the lower most position in the stack of papers in the cartridge 30 is fed towards the platen roller 93. More specifically, the paper 55 is deformed as a result of the friction engagement with the feed roller 175 and is disengaged from the fingers 53b and 54b holding the paper in the recording paper accommodating part 33 of the cartridge 30. The paper 55 thus separated from the cartridge 30 is transported with the rotation of the feed roller 175 and is fed on the platen roller 93 until it is engaged with the clamper 127 shown in FIG.21. When the photo sensor 197 detects the recording paper 55 on the platen roller 93, the solenoid actuators 121, 186 and the motor 171 shown in FIGS.13 and 15 are deenergized. Responsive to the deenergizing of the solenoid 121, the clamper 127 holds the paper 55 on the platen roller 93 securely. As already described, the inner surface of the clamping portion of the clamper is provided with knurling and the like for increasing the frictional engagement, so the clamper 127 securely holds the paper on the platen roller 93. After the paper 55 is held securely on the platen roller 93, the motor 116 shown in FIG.14, is energized and the platen roller 93 is rotated. As the same time, the photo detecting mechanism 170 produces output pulses indicating the rotation of the platen roller 93. Thus, when the clamper 127 on the platen roller 93 passes under the thermal head 143 as a result of rotation of the platen roller 93, the solenoid actuator 159 is energized and the thermal head 143 is moved towards the platen roller 93 from the state shown in FIG.22 to the state shown in FIG.23, and the ink film 36 is pressed on the paper 55 held on the platen roller 93. At the same time, the motor 132 for driving the core 37 of the take up reel 34 is energized and the ink film 36 is wound on the take up roll 34 until it is discriminated as a result of the output signal of the photo detector 200 that the ink film 36 has reached the predetermined position ready for printing. When the ink film 36 is moved to the predetermined position ready for printing, the thermal head 143 is supplied with a current corresponding to the image to be printed, and the ink on the film 36 is transferred to the recording paper 55 while rotating the platen roller 93 and feeding the ink film at the same time in synchronization with the rotation of the platen roller 93 and thus the printing of the image on the recording paper is achieved. During this printing operation, the roller 201 continuously urges the paper on the platen roller 93, and the paper is securely held on the platen roller 93. Thus, a high quality of printing can be made with excellent precision. After the printing of the image in the first color such as yellow is completed, the solenoid actuator 159 is deenergized when the clamper 127 comes close to the thermal head 143 with the rotation of the platen roller 93. Thus, the thermal head 143 is removed from the surface of the platen roller 93 by the force exerted by the spring 161 as shown in FIG.23, and the solenoid actuator 159 is again energized and the thermal head 143 is again pressed on the surface of the ink film 36 on the platen roller 93. During this interval in which the thermal head 143 is moved away from the surface of the platen roller 93, the ink film 36 is fed further until it is discriminated on the basis of the output signal from the photo detector 200 that the second marking or the second inked part on the film 36 has reached the predetermined position ready for printing relative to the recording paper 55 on the platen roller 93. Similarly, this printing procedure is repeated and a desired color printing is completed. The control of the thermal head 143, the position of the ink film, and the timing by which the head is removed from the platen roller 93 are made on the basis of the pulse generated from the motor 165. After the printing is completed, the recording paper 55 thus printed is discharged from the printer 80 by reversing the platen roller 93 in the counter clockwise direction when the rear end of the paper 55 has reached the position at which the front end of the paper 55 is clamped on the clamper 127 at the time of feeding. During this reversal of the rotation of the platen roller 93 for discharging the paper, the discharge rollers 181, 183 and 184 in FIG.15 are driven. Further, when the recording paper 55 on the platen roller 93 has reached the aforementioned position in which the rear end of the paper coincides with the Position at which the paper is held on the platen roller at the time of feeding, the solenoid actuator 121 is energized and the clamper 127 is released. Further, the rotation of the platen roller 93 is stopped at the same time. Responsive to the reversed rotation of the platen roller 93 in the counter clockwise direction shown in FIG.15, the paper 55 is disengaged from the platen roller 93 and is accepted on the guide plate 192. The paper 192 is then transported along the guide plate 192 by gravity and is held between the feed roller 175 and the discharge rollers 183 and 184. Further, the motor 171 is energized and the feed roller 175 and the discharge rollers 183 and 184 are driven as a result of the rotation of the motor 171. Thus, the paper 55 is driven by the feed roller 175 as well as by the discharge rollers 183 and 184 and is discharged along the path between guide plates 203 and 204. Further, the motor 171 and the solenoid actuator 121 are deenergized when a sensor 205 detects the paper 55. Thus, the paper is held between the guide plates 204 and 205 when the discharge of the paper is completed and the discharged paper is prevented from falling on the floor. Further, the platen roller 93 is rotated to the initial position in which the clamper 127 is positioned so as to accept the feeding of the next paper. This return of the platen roller 93 to the initial position is discriminated by the disk-shaped sensor plate 163 and the photo detecting mechanism 170. Further, the motor 132 is rotated again for further drawing out the ink film 36 to a position where it is ready for printing, and the printer 80 becomes ready for printing for the next sheet of paper. Thus, responsive to the re-operation of the start button of the printer 80, the printing on the next paper is commenced. When the ink film 36 is used up and wound up on the take up roll 34, the ink film 36 has to be replaced with a new one. In order to replace the ink film 36, an unloading button of the printer (not shown) is operated by the user, and responsive thereto, the arms 96a and 96b are rotated in the counter clockwise direction in FIG.11 or in the clockwise direction in FIG.22. Thus, the take up roll 34 held in the U-shaped openings 96a₁ and 96b₁ at the end of the arms 96a and 96b is returned to the ink roll roll holding part 32 of the cartridge 30. The same operation is performed also when the printer has detected that the ink film is used up. During the movement of the arms 96a and 96b to the state shown in FIG.22 by the solid line, the solenoid actuator 121 in FIG.13 is energized and the slidable gear 113 is connected to the motor 99 driving the arms 96a and 96b. As a result, the film 36 is taken up on the supply roll 35 with the arms 96a and 96b moving back to the state shown in FIG.22. When the arms 96a and 96b are fully returned, the pin 98 on the arm 96a actuates the switch SW2 and the motor 99 is deenergized responsive thereto. In this state, the cartridge 30 is ready to be pulled out from the printer 80, and by removing the cartridge 30 from the printer 80, the user can perform the replacement of the ink film roll 35. During this operation, the user can check the amount of consumption of the paper in the cartridge 30, and can supply the paper to the cartridge 30 if necessary. In the description heretofore, the take up roll 34 is transported by the levers 96a and 96b. However, the present invention is not limited to such an embodiment but may be constructed such that the supply roll 35 is transported by the levers. In this case, however, it is necessary to modify the disposition of the gear 43 as the take up roll 34 is held in the cartridge 30 in this modification. Next, another embodiment of the printer of this invention will be described with reference to FIGS.27(A) - (D) in which the platen roller is rotated in synchronisation with the movement of the arms. In this embodiment, one can eliminate the use of a separate motor for driving the arms. Referring to the drawings, an arm 207 corresponding to the arm 96b of FIG.22 carries a slide member 210 slidably held on a pin 209 and held rotatable about the shaft 92 of the platen roller 93 relative to the platen roller similarly to the previous embodiment. Further, the shaft 92 carries a hook 208 which can be displaced relative to the arm 207. Thus, when the cartridge 30 is inserted into the printer 80 in the state shown in FIG.27(A), the take up roll 34 is engaged into an opening 207a at the end of the arm 207 held horizontally for accepting the take up roll 34, and at the same time, the slide member 210 is displaced towards the shaft 92 by the front end of the cartridge 30 against the force exerted by a spring 211, and the hook 208 is locked with the slide member 210. When the platen roller 93 is rotated about the shaft 92 in this state in the clockwise direction, a pin 212 at the side of the platen roller 93 is engaged with a bent portion 210a of the slide member 210 as shown in FIG.27(C), and the arm 207 is moved with the platen roller 93 towards the clockwise direction. Thus, the take up roll 34 is transported to the predetermined position shown in FIG.27(D). Immediately before reaching the state shown in FIG.27(D), a pin 213 provided on the printer 80 holds the hook 208. Thus, with the further rotation of the platen roller 94 in the clockwise direction, the hook 208 is rotated relative to the platen roller 93 in the counter clockwise direction. As a result, the slide member 210 is disengaged from the hook 208 and is returned to the original position in the arm 207. Thereafter, the engagement of the pin 212 with the slide member 210 is cancelled and the platen roller 93 can rotate freely relative to the arm 207 for printing. When returning the arm 207, a unidirectional clutch (not shown) between the shaft 92 and the arm 207 is engaged, and the arm 207 is moved responsive to the clockwise rotation of the platen roller 93 and the take up roll 34 is returned to the ink roll holding part 32 of the cartridge 30. In this embodiment, the arm 207 is moved responsive to the rotation of the platen roller 93, and use of a separate motor for driving the arm can be eliminated. This leads to the reduction in size as well as in cost of the printer. FIG.28 shows a locking mechanism of the cartridge 30. Referring to the drawing, the top side 31b (see FIG.2(C)) of the cartridge body 31 is formed with a cutout 215. Further, a bent locker arm 217 is supported rotatably on a shaft 216 fixed on the body of the printer 80, and a portion spring 218 is fitted on the shaft 216. The portion spring 218 has an end fixed to the body of the printer 80 and another end connected to an end of the locker arm 217 so as to urge the locker arm 217 in the counter clockwise,direction. As rotation of the locker arm 217 is restricted by abutting with the arm 96a or 96b when the arms 96a and 96b are in the state shown in FIG.28, the arm 217 is held at the position shown by the solid line in FIG.28. When the cartridge 30 is inserted into the printer 80 as shown in FIG.11, the core 37 of the take up roll 34 at the front end of the cartridge 30 is engaged into the U-shaped opening at the end of the arm 96b. Further, when the arm 96 is rotated from this state in the clockwise direction so as to transport the take up roll 34 over the platen roller 93, the restriction preventing the locker arm 217 from rotating in the counter clockwise direction is removed and the locker arm 217 is rotated in the counter clockwise direction by the force exerted by the portion spring 218. As a result of this rotation of the locker arm 217, a pin 217a formed at the end of the arm 217 is accepted in the cutout 215 on the top side 31b of the cartridge 30. Thus, the cartridge 30 is locked in the printer 80 by the pin 217a at the end of the locker arm 217. Next, an inexpensively constructed disposable type cartridge 230 which is a modification of the cartridge 30 will be described with reference to FIG.29. Referring to the drawing, the disposable type cartridge 230 comprises a cartridge body 231 moulded from a polypropylene based resin on which a finger 232 corresponding to the fingers 53b and 54b and a movable tray 233 corresponding to the movable tray 61 of the cartridge 30 are provided unitarily. The cartridge 230 has the recording paper accommodating part 33 and the movable tray 233 is accommodated in the part 33 such that the tray 233 is connected to a bottom side 231a of the cartridge body 231 via a flexible part 233a such that the tray 233 can move up and down about the flexible part 233a. It should be noted that the free end of the movable tray 233 is located adjacent to the finger 232. The free end of the tray 233 is formed with a flat part 233b which is horizontal in the state shown in FIG.29. On the side of the flat part 233 facing the feed roller 175 shown in FIG.15 there is formed a creased part 233c along a direction perpendicular to the feeding direction of the paper. As can be seen from FIG.29, the finger 232 has a rounded surface 232a on the side facing the feed roller and has a tapered surface 232b projects towards the stack of papers (not shown) held on the movable tray 233. Thus, the separation of the individual sheet of paper from the paper stack in the cartridge 30 is facilitated. It should be noted that the cartridge 230 is inserted into the printer 80 in a manner similar to that in the case of the cartridge 30 such that the ink roll holding part 32 indicated by a two-dotted line in FIG.29 is inserted first into the printer 80. Further, a hole 235 for detecting the recording paper is formed on the flat part 233b so as to enable the detection of the paper in the recording paper accommodating part 33 by means of a photo sensor detecting the reflection of light from the paper in the recording paper accommodating part 33. Such a cartridge 230 moulded from a resin as an integral body can also be used as a cartridge for other types of printers which use a cartridge carrying a roll of ink ribbon. Further, the cartridge 230 can be used as a simple tray for holding the recording paper alone. FIG.30 shows a second embodiment of the cartridge of the present invention. Referring to FIG.30, the cartridge 240 has a substantially identical construction to the cartridge 30 shown in FIGS.2(A) - (C) except that the rear end 242 of the cartridge 240 is made of a transparent material. The transparent rear end 242 may be mounted on a cartridge body 241 having a construction similar to the cartridge body 31 except that the rear end is removed, and the rear end 242 is mounted on the cartridge body 241 by screws 243. According to this embodiment, the user can check the amount of paper remaining in the cartridge 240 visually through the rear end. Next, a third embodiment of the cartridge applicable to the printer 80 will be described with reference to FIGS.31(A) and (B) as well as FIGS.32(A) and (B). Referring to FIGS.31(A) and (B), the cartridge has a construction generally identical to the cartridge 30 shown in FIG.2(A) except that the overall construction is enclosed by a cover 268 which is movable along the bottom side 31a of the cartridge body 31 in the directions shown by arrows E₁ and E₂ so as to close the opening 33a in the recording paper accommodating part 33 and another cover 269 which is movable along the top side 31b of the cartridge body 31 in the directions E₁ and E₂ so that the ink roll holding part 32 is covered by the cover 269. Further, the top plate 58 (FIG.31(B)) closes the top side 30b of the cartridge 30 and the entire structure of the cartridge 30 is closed. Further, the cartridge body 31 is fixed with a guide plate 272 similar to the lid 64 so as to close the bottom side 31a of the cartridge body 31 at the side close to its rear end by screws 273 as shown in FIG.31(B). Thus, the cover 268 is held in a groove 279 defined between the guide plate 272 and the cartridge body 31 and is guided in the direction indicated by the arrows E₁ and E₂. Further, the cover 268 carries a pair of projections 268a and 268b, and a pair of springs 275 having respective ends fixed to the cartridge body 31 by a pin 274 are connected to these projections so as to urge the cover 268 towards the direction E₁. As a result, the opening 33a is closed by the cover 268 in the normal state in which the cartridge is not inserted into the printer 80. Thus, intrusion of dust into the cartridge is prevented and the recording paper in the cartridge is prevented from becoming stained. Similarly, the cover 269 closing the ink roll holding part 22 of the cartridge is held slidably in a groove 278 defined between the top side 31b of the cartridge body 31 and the guide plate 277 fixed thereto by screws 276 (FIG.31(B)) in the directions E₁ and E₂. Further, the cover 269 carries a pair of projections 269a and 269b extending laterally from the cover 269, and a pair of springs 282 having respective ends fixed to the cartridge body 31 by a pin 281 is connected to the projections 269a and 269b after being turned around a pin 280 formed on the cartridge body 31. As a result, the cover 269 is urged in the direction E₁ in the normal state and the ink roll holding part of the cartridge is closed by the cover 269. When the cartridge 260 having the construction thus described is inserted into the printer 80 through the insertion opening 81 in the direction D₁ as indicated in FIG.12 such that the ink roll holding part 32 is inserted first into the printer 80, the projections 268a and 268b on the cover 268 are held by projections 283a₁ and 283b₁ of a stopper 283 provided in the printer 80, and the cover 268 is displaced relatively to the cartridge 260 in the direction E₂ and the opening 33a is exposed. Further, responsive to the insertion of the cartridge 260 into the printer 80, the projections 269a and 269b of the cover 269 are held by projections 283a₂ and 283b₂ of the stopper 283, and the cover 269 is displaced in the direction E₂ relative to the cartridge 260 and the ink roll holding part 32 is exposed. Further, at the same time as the displacement of the covers 268 and 269, the take up roll 34 and the arms 96a and 96b are engaged, and the feed roller 175 is moved into the cartridge 260 through the opening 33a. Thus, the printer 80 becomes ready for printing. Next a fourth embodiment of the cartridge of the present invention will be described with reference to FIGS.33 - 38. In the drawings, those portions having a construction identical with corresponding portions in the previous drawings are given identical reference numerals and the descriptions thereof will be omitted. Referring to the drawings, a cartridge 300 of the present embodiment comprises an ink roll holding part 321 which in turn comprises a stationary part 325 at a front side (right hand side in the drawing) of a cartridge body 320 and a lid 322 for closing the stationary part 325. The ink roll holding part 321 holds a take up roll 332 and a supply roll 333 on which the ink film 36 is wound. In the present embodiment, the ink film 36 in the ink roll holding part 321 is prevented from being touched by a finger of the user as long as the lid 322 is closed. It should be noted that the take up roll 332 is located at a front side of the supply roll 333. Further, a rear end 322a of the lid 322 is hinged on the cartridge body 320 by a commonly used hinge mechanism 326. As a result, the lid 322 is rotatably held about a rotational axis extending along the rear end 322a of the lid 322. Thus, the front end of the lid 322 is detached from the stationary part 325 in response to the rotation of the lid about the rotational axis. Further, the hinge mechanism 326 carries a spring 326a which urges the lid 322 such that the lid is closed. Furthermore, the lid 322 has a height H1 which is about one half of the height H2 of the cartridge 300. When the lid 322 is rotated relative to the stationary part 325 of the ink roll holding part 321 of the cartridge 320, an opening 337 (FIG.35) is formed at the front end of the cartridge 300. The size of the opening 337 is set such that, when the opening 337 is fully opened, the opening 337 is opened slightly larger than the maximum diameter of the take up roll 332, thus allowing for the taking out of the take up roll 332 from the cartridge 300 by the thermal printer. Further, semi-circular cutouts 327 and 328 are formed on the side wall of the stationary part 325 as well as on the side wall of the lid 322 of the cartridge 300 as shown in FIGS.34 and 35 so that first and second bearing parts are formed for holding cores 335 and 334 of the supply roll 333 and take up roll 332 when the lid 322 is closed. As the ink film 36 is wound on the cores 335 and 334 in the ink roll holding part 321, the supply roll 333 and the take up roll 332 are supported in the ink roll holding part 321 of the cartridge 300 via the cores 335 and 334. When the lid 322 is opened, the cutout 327 in the stationary part 325 and the cutout 327 in the lid 322 are separated from one another and the bearing support of the supply roll 333 disappears as illustrated in FIG.35. Similarly, responsive to the opening of the lid 322, the cutout 328 in the stationary part 325 and the cutout 328 is the lid 322 are separated from one another and the bearing support of the take up roll 332 disappears. It should be noted that the cores 334 and 335 have projections 334a and 335a for engagement with projections of a drive shaft to be described later at their respective ends. Further, the lid 322 of the cartridge 300 has a flexible tongue member 336 extending downwards from its inner surface as shown in FIG.34. This tongue member 336 may be made of a soft plastic and the like and is disposed so as to be positioned between the supply roll 333 and the take up roll 332 as shown in FIG.34 by a one-dotted line when the lid 322 is closed. The tongue member 336 is disposed parallel to the front end of the cartridge body 320 and has a width slightly larger than the width of the ink film 36. When the lid 322 is closed, the supply roll 333 and the take up roll 332 are separated by the tongue member 336 and the contact of the ink film 36 on the supply roll 333 and the ink film 36 on the take up roll 332 is prevented even if one of the rolls comes off from the cutouts 327 or 328. Further, the tongue member 336 produces slackness by pushing the ink film 36 between the rolls 332 and 333. As a result, unwanted tension on the ink film 36 is prevented, and unwanted rotation of the rolls 332 and 333 due to the force accidentally applied to the ink film 36 is prevented at the same time. As the tongue member 336 has an end provided with chamfering, the ink film 36 is not damaged by the contact with the tongue member 336. Further, the cartridge 300 of the present embodiment is provided with a lock mechanism as shown in FIG.36 for preventing accidental opening of the lid 322 at the time the cartridge is taken out from the printer. Referring to FIG.36, the lock mechanism comprises a lock member 345, a spring 346 for urging the lock member 345, and a projection 322b provided on the rear end 322a of the lid 322 at both its sides. The lock member 345 has an end held rotatably about a pin 347 and another end carrying a lock finger 345a to be engaged with the projection 322b of the lid 322. Further, the lock member 345 has a projection 345b extending laterally to the lock finger 345a. The lock member 345 is urged by the spring 346 in the clockwise direction about the pin 347, and in this state, the finger 345a of the lock member 345 is located below the projection 322b extending from the rear end 322a of the lid 322 as shown by a two-dotted chain line in FIG.36. Thus, the projection 322b of the lid 322 is engaged with the lock finger 345a of the lock member 345 and the rotation of the lid 322 is prevented. Thus, the lid 322 is prevented from opening in the state shown in FIG.36 by the two-dotted line. It should be noted that, in this state, the projection 345b is accepted in an opening 320b provided on a guide groove 320a which in turn is provided on the side wall of the cartridge body 320. As the guide groove 320a accepts a guide rib of the printer when the cartridge 300 is inserted into the printer, the projection 345b in the guide groove 320a is pushed by the guide rib of the printer when the cartridge 300 is inserted into the printer and the lock member 345 is rotated in the counter clockwise direction against the action of the spring 346. Responsive to the counter clockwise rotation of the lock member 345, the finger 345a is displaced from the position engaging with the projection 322b of the lid 322 and the lid 322 becomes freely rotatable. Thus, the cartridge 300 of the present invention prevents the opening of the lid 322 when the cartridge is taken out from the printer and the ink film 36 in the cartridge is reliably protected. Further, the lid 322 and the stationary part 325 of the ink roll holding part 321 have chamfered part at their front ends so as to facilitate the insertion of the cartridge into the printer to be described later. This chamfering of the front end of the cartridge also reduces the height of the front end of the lid 322 when the cartridge is inserted into the printer and the lid 322 is opened in the printer, thus contributing to the elimination of unused space in the printer. The cartridge 300 has on its front end facing the inside of the printer a pair of cutouts 338 and 339 extending from the lid 322 to the stationary part 325 as shown in FIG.33 for allowing insertion of the arms of the printer into the cartridge 300 for engaging with the take up roll 332. Further, the stationary part 325 of the ink roll holding part 321 has on its bottom (outer surface) a pair of ribs 340 shown in FIG.37 for separating the paper 55 on which the image is printed from the bottom of the ink roll holding part 321. The ribs 340 extend in a direction generally perpendicular to the front end of the cartridge 300 or extend in the direction of insertion of the cartridge into the printer. The ribs 340 have a rounded upper surface and are disposed so as to correspond to the non-printing marginal space of the paper when the paper is discharged from the printer after the printing is completed. Thus, damage to the image printed on the paper by the ribs is avoided. At both sides of the bottom of the stationary part 325 of the cartridge 300, there are provided steps 348 for locking the cartridge such that the cartridge 300 cannot be drawn out from the printer. In the locked state, the steps 348 are engaged with projections of the printer which hold the cartridge 300 responsive to the movement of the arms for taking out the take up roll 332. As a result of this locking, abuse such as inadvertent unloading or removal of the cartridge from the printer when the arms of the printer are moved to their operational positions and when the ink film wound on the take up roll is drawn out into the printer by the arms is prevented. Next, a recording paper accommodating part 323 of the cartridge 300 formed behind the ink roll holding part 321 for accommodating a stack of papers 55 will be described. The recording paper accommodating part 323 is a space defined in the body 320 of the cartridge 300 behind the ink roll holding part 322 and comprises a cover plate 324 at the bottom of the cartridge body 320 for closing a part of the space. Thus, the paper in the recording paper accommodating part 323 is taken out from the cartridge 300 through an opening 350 shown in FIGS.34 and 37 which is the part of the space not covered with the cover plate 324, and is transported to a predetermined position in the printer. The recording paper accommodating part 323 further has a pair of fingers 351 at its front end for holding the recording papers 55 one by one. Each of the fingers 351 is fixed in the recording paper accommodating part 323 such that the finger does not project to reach the cover plate 324 at the bottom of the cartridge. In other words, the cartridge 300 does not carry unnecessary projections on its bottom and the insertion of the cartridge 300 into the printer is performed without any problem. In the recording paper accommodating part 323, there is provided a tray 352 for supporting the recording paper 55 and a spring 353 (FIG.34) for urging the tray 352 towards the bottom of the cartridge 300 as shown in FIG.37. It should be noted that FIG.37 shows the bottom of the cartridge 300. Further, the lower side of the tray 300 supporting the paper 55 is provided with minute projections and depressions so as to increase the friction between the tray 352 and the papers 55 such that the friction between the tray 352 and the paper 55 is larger than the friction between the papers yet smaller than the friction between the paper 55 and a feed roller of the printer used for taking out the paper from the cartridge 300. Thus, all of the papers 55 in the cartridge 300 are reliably taken out one by one. The cover plate 324 of the cartridge 300 is further provided with a plurality of apertures 342a for detecting the paper 55 having various sizes. The number and the length of the apertures 342a are changed in correspondence to the sizes of the paper 55 as well as in correspondence to the type of the ink film 36. These apertures 342a are used by a detector incorporated in the printer for setting the operational mode of the printer to an optimal mode matching the type of the paper in the cartridge 300. As the apertures 342a are provided on the cover plate 324 which is a separate member from the cartridge body 320, various types of cover plates 324 having different apertures 342a may be selectively used for a common cartridge body 320 in production. Thus, it is not necessary to prepare various types of cartridge bodies 320 which correspond to the type of the paper to be used even in such a case that a variety of papers are used for recording. Further, as a result of constructing the cartridge body 320 and the cover plate 324 as separate members, the cartridge body 320 may be mass-produced by injection moulding using a single mould for all of the cartridges. Thus, the manufacturing cost of the cartridge 300 is significantly reduced. As the apertures 324a are transparent, the user can use these apertures to check if there is any paper remaining in the cartridge 300. At both sides of the cartridge body 320 of the cartridge 300 having a unitarily constructed recording paper accommodating part 323 and ink roll holding part 321, there are provided a pair of the aforementioned guide grooves 320a such that each of the guide grooves extend from the side wall of the recording paper accommodating part 323 to the side wall of the lid 322 of the ink roll holding part 321 as shown in FIG.33. These guide grooves facilitate the insertion of the cartridge 300 into the printer by engaging with the guide rib of the thermal printer (not shown) and determine the position of the cartridge 300 in the printer. Further, the front end of the guide groove 320a is slightly widened as a result of chamfering the front end of the guide groove 320a as shown by a slope 322c (FIG.33). As a result, the engagement of the guide rib of the printer with the guide groove 320a is facilitated. Further, the slope 322c is abutted with a cam member of the printer (not shown) when the cartridge is inserted into the printer and as a result of this abutting, the lid 322 is opened smoothly in the printer. Further, the cartridge body 320 is provided with a grip depression 320c (FIG.33) on its upper surface so it can be held by a finger of the user when removing the cartridge 300 from the printer. Next, a fifth embodiment of the cartridge of the present invention will be described with reference to FIG.38. In the drawing, those portions having a construction identical to corresponding portions in the previous drawings are given identical reference numerals and the description thereof will be omitted. Referring to the drawing, a cartridge 300A of the present embodiment has a removable lid 324b connected to the cover 324 so as to close the aforementioned opening 350 from which the paper 55 is taken out. Prior to use, the removable lid 324b is connected to the cover 324 closing the bottom of the recording paper accommodating part 324 and the opening 350 is closed by the lid 324b. Further, a slit 324c may be provided on the cover 324 between the cover 324 and the removable lid 324b so that the lid 324b is easily separated from the cover 324. Furthermore, the removable lid 324b may be provided with a grip 324d so that the lid 324b is easily separated from the cover 324. As a result of the use of the cover 324 having the lid 324b connected unitarily to the cover 324, the paper 55 in the recording paper accommodating part 323 is protected against dust and the like. Further, the apertures 324a may be provided on the cartridge body 320 as shown in FIG.38. Next, a printer 359 adapted to use the cartridge 300 or 300A will be described with reference to FIG.39. Further, the operation of the printer 359 will be described together with reference to FIGS.40 through 43. In the drawing, those parts having a construction identical to those corresponding parts already described in the previous drawings are given identical reference numerals and the description thereof will be omitted. Referring to the drawing, the printer 359 carries a guide rib 368 to be engaged with the guide groove 320a of the cartridge 300 or 300A and a cam member 369 for opening the lid 322 of the cartridge 300 or 300A located in the vicinity of the guide rib 368. The cam member 369 is provided obliquely to the guide rib 368. When the cartridge 300 or 300A is inserted into the printer 359, the projection 345a of the lock member 345 is pressed by the guide rib 368 and the lock of the lid 322 is released. Further, the portion of the guide groove 320a extending through the lid 322 is engaged with the cam member 369, and responsive to the insertion of the cartridge into the printer 359, the lid 322 is opened as shown in FIG.40 as a result of abutting of the cam member 369 with the slope 322c provided at the front end of the guide groove 320a (FIG.33). Further, a pair of arms 364 of the printer 359 are inserted into the cutouts 338 and 339 at the front end of the cartridge 300 or 300A and a hook 365 provided at an end of each of the arms 364 is engaged with the end of the core 334 of the take up roll 332. Further, a rotary shaft 370 shown in FIG.39 is engaged with the core 335 of the supply roll 333. When the cartridge 300 or 300A is properly loaded on the printer 359, the arm 364 commences its clockwise rotation as shown in FIG.41. In the cartridge 300 or 300A, the ink film 36 is slackened as a result of the tongue member 336 provided on the lid 322. As a result of the slackness of the ink film 36, accidental dropout of the take up roll 332 from the hook 365 of the arm 364 due to the tension of the ink film 36 when the take up roll 332 starts to move is prevented. Further, together with the rotation of the arm 364 in the clockwise direction, a lock lever 366 is rotated in the clockwise direction and a projection 366a at the end of the lock lever 366 is engaged with a corresponding stepped part of the cartridge 300 or 300A and holds the cartridge securely in the printer. Thus, the cartridge is protected against unintentional or erroneous removal of the cartridge from the printer during the operation of the printer in which the take up roll 332 is moved away from the ink roll holding part 321 of the cartridge 300 or 300A and the ink film 36 is drawn out from the supply roll 333. Responsive to the completion of the loading of the cartridge 300 or 300A in which the arms 364 are fully swung to the predetermined position, a drive shaft 371 is engaged with the core 334 of the take up roll 332. At the same time as the completion of loading of the cartridge on the printer 359, a thermal head 361 is moved to the supply roll 372 and a feed roller 372 similar to the feed roller 175 of FIG.15 is engaged with the paper 55 in the cartridge. Thus, the paper 55 is taken out from the cartridge 300 or 300A one by one. During this procedure, the paper 55 is prevented from direct contact with the bottom of the cartridge 300 or 300A because of the existence of the ribs 340 and the damage to the paper 55 due to the contact with the bottom of the cartridge is prevented. The paper 55 thus taken out from the cartridge 300 or 300A is held by a clamper 363 on a platen roller 360. The paper 55 is then transported to a predetermined printing station together with the platen roller 360 in response to the rotation of the platen roller. In this printing station, the thermal head 361 is pressed on the paper 55 held on the platen roller 360 via the ink film 36. Further, the platen roller 360 is rotated in the clockwise direction in this state and the ink film 36 is taken up on the take up roll 332 at the same time responsive to the driving of the drive shaft 371. When the printing by respective colors is completed, the platen roller 360 is rotated in the counter clockwise direction and the paper 55 is discharged from a path defined by a pair of plate members 385 and 386 shown in FIGS.39 - 43. Further, when removing the cartridge 300 from the printer 359, the arms 364 are swung in the counter clockwise direction while taking up the ink film on the take up roll 332 by driving the shaft 371 in the clockwise direction. As a result, the take up roll 332 is returned to the ink roll holding part 321 of the cartridge 300 or 300A. Further, responsive to the returning of the arms 364 to the original state shown in FIG.40, the lock lever 366 is rotated in the counter clockwise direction and the projection or the finger 366a carried by the lever 366 is disengaged from the step 348 shown in FIGS.37 and 38. In this state, the cartridge 300 or 300A is removable from the printer 359. The printer 359 further has a detector 381 disposed so as to face the apertures 324a of the cartridge 300 or 300A for detecting the paper in the cartridge. The detector 381 comprises a light emitting device 382 for emitting a light substantially from its entire surface, a row of photo sensors 383 for receiving the light emitted from the light emitting device 382 and reflected back from the paper in the cartridge through the apertures 324a, and a transistor array 384 for converting the output from the photo sensors 383 to a logical output data indicating the type and size of the paper accommodated in the cartridge. FIG.45 shows a sixth embodiment of the cartridge of the present invention. In the drawing, those parts having a construction identical to corresponding parts in the previous drawings are given identical reference numerals and the description thereof will be omitted. Referring to FIG.45, a cartridge 400 of this embodiment has a recording paper accommodating part 323 in which a tray 401 is disposed for supporting the recording paper 55. This tray 401 is urged by springs 402 and 403 so that the paper 55 on the tray 404 is urged against the opening 350. The springs 402 and 403 have an identical spring constant. The tray 401 is held in a state oblique to the body 320 of the cartridge by the springs 402 and 403 such that the tray 401 extends generally parallel with the direction along which the paper 55 is slid when the paper is taken out from the cartridge 400. Further, in this embodiment, the tray 401 is displaced towards the bottom of the body 320 of the cartridge 400 in response to the consumption of the paper in the cartridge while maintaining the oblique relation with the body of the cartridge 400. In this embodiment, the paper 55 is always held generally parallel with the direction along which the paper is slid or pulled by the feed roller when taking out the paper from the cartridge. As a result, the paper 55 is taken out from the cartridge 400 always parallel with the stock of papers held in the cartridge and the paper can be smoothly taken out from the cartridge 400. In order to further facilitate the smooth taking out of the paper 55 from the cartridge, the body 320 of the cartridge 400 is provided with a step 404 having an oblique top surface which is substantially parallel with the tray 401 held obliquely in the cartridge 400. As a result, the paper 55 is held between the tray 401 and the top surface of the step 404 and can be taken out from the cartridge 400 with an increased reliability. Thus, the cartridge 400 of the present embodiment enables stable feeding of the paper to the printer irrespective of the amount of paper remaining in the cartridge 400 and chances of the paper being jammed somewhere between the cartridge and the platen roller during the transport of the paper are substantially reduced. FIG.46 shows a seventh embodiment of the cartridge of the present invention. In the drawing, those parts having a construction identical to those corresponding parts in the previous drawings are given identical reference numerals and the description thereof will be omitted. Referring to FIG.46, a cartridge 410 of the present embodiment is identical to the cartridge 400 except for the use of a support member 411 having an obliquely defined surface which extends parallel with the top surface of the step 404 for supporting the tray 401. As a result of the use of the support member 411, the tray 401 is held parallel with the direction of the feeding of the paper from the cartridge. Thus, an advantage similar to that obtained from cartridge 400 is obtained by using a single spring 412. Further, various variations and further modifications may by made without departing from the scope of the claims.

Claims: A cartridge for a printer system comprising a printer in which the cartridge (30) is loaded, said cartridge being designed for storing a sheet to be fed to the printer for printing, said cartridge being designed further to hold an ink film (36) also to be fed to the printer such that an image is printed on the sheet as a result of an action of a printer head of the printer performed under a state wherein the ink film (36) and the sheet contact each other on a platen roller (93) of the printer, said cartridge being adapted to be loaded on the printer in such a direction that a front end of the cartridge is first inserted into the printer when the cartridge is loaded, said cartridge comprising an ink film storing part (32, 321) provided at the front end of the cartridge for storing an ink film, said ink film storing part removably holding a first roll (34, 332) and a second roll (35, 333) of the ink film in a state wherein the first and second rolls (34, 35, 332, 333) are mutually parallel and wherein the ink film is wound on the first and second rolls (34, 35, 332, 333) and stretched therebetween, characterised in that said ink film storing part (32, 321) has a first opening (32c, 337) generally forcing a first direction which is perpendicular to the direction of loading of the cartridge on the printer and perpendicular to the direction of the axis of the first and second rolls, said first opening (32c, 337) being configured to allow taking out of the first roll (34, 332) from the cartridge therethrough, said ink film storing part (32, 321) having a stationary part for covering the first and second rolls (34, 35, 332, 333) in a manner that prevents the first and second rolls (34, 35, 332, 333) being exposed in a second direction opposite to the first direction; said cartridge further comprising: a sheet storing part (33, 323) provided behind the ink film storing part (32, 321) such that the sheet storing part (33, 323) and the ink film storing part (32, 321) form a unitary body, for storing one or more sheets in a stack, said sheet storing part (33, 323) having a second opening (33a, 350) which exposes the sheet stored in the sheet storing part (33, 323) in said second direction so as to allow feeding of the sheet from the cartridge through said second opening (33a, 350); and a rotatable lid member (322) hinged on the ink film storing part (32, 321) so as to be rotatable between a first position whereat said lid member (322) closes the first opening (32c, 337) and a second position whereat said lid member (322) exposes the first opening (32c, 337), said rotatable lid member (322) being hinged at a part of the cartridge where the sheet storing part (33, 323) is contiguous with the ink film storing part (32, 321), said rotatable lid member (322) having a part which engages a corresponding part of the printer when the cartridge is loaded on the printer such that the lid member (322) is rotated to the second position upon loading of the cartridge on the printer. A cartridge for a printer system as claimed in Claim 1, characterized in that said first opening (32c) is provided at an upper side of the cartridge, and said second opening (33a) is provided at a lower side of the cartridge. A cartridge for a printer system as claimed in Claim 2, characterized in that said paper storing part comprises a tray (61, 233, 352, 401) for holding the sheets (55) at a lower side thereof and elastic means (63, 233a, 353, 402, 403) for urging the tray downwards so as to urge the sheet paper towards said second opening (33a, 350). A cartridge for a printer system as claimed in Claim 1, characterized in that said paper sheet storing part (33) comprises a cover (268) which closes said second opening (33a) when the cartridge is out of the printer but exposes said second opening when the cartridge is loaded on the printer. A cartridge for a printer system as claimed in Claim 1, characterized in that said ink film storing part (321) further comprises a lock mechanism for preventing the lid member (322) being rotated to the second position when the cartridge is not loaded on the printer. A cartridge for a printer system as claimed in Claim 1, characterized in that said lid member (322) and said stationary part of the ink film storing part are provided with semi-circular cutouts on respective side walls so as to form circular bearing support parts for supporting the first and second rolls of ink film when the lid is rotated to the first position and the first opening is closed. A cartridge for a printer system as claimed in Claim 2, characterized in that said ink film storing part (321) has ribs (340) on a bottom surface of the stationary part of the ink film storing part such that the ribs extend in the direction along which the sheet is fed from the sheet storing part (323) to the printer, said ribs (340) being disposed such that the ribs (340) contact non-printing marginal space of the sheet when the sheet is discharged from the printer after the printing is completed. A cartridge for a printer system as claimed in Claim 1, characterized in that said lid member (325) has a tongue member (336) depending from an inner surface of the lid member such that the tongue member is located between the first and second rolls (332, 333) of ink film. A cartridge for a printer system as claimed in Claim 1, characterized in that the cartridge further comprises detecting means (324a) for detecting a type of the sheet in the sheet storing part (33, 323) and a type of ink film in the ink film storing part (32, 321), said detecting means (324a) comprising a cover plate provided removably on the sheet storing part such that the cover plate closes a side of the sheet storing part (33, 323) of the cartridge facing the first direction, said cover plate having at least one aperture for detecting the pressure and absence of the sheet and the size of the sheet in the sheet storing part. A cartridge for a printer system as claimed in Claim 1, characterized in that said cartridge further has cutouts at the front end thereof such that each cutout continues to the first opening, for accepting an arm member of the printer which removes the first roll from the cartridge through the first opening upon loading of the cartridge on the printer system.

Inventors: ICHITO, TOSHIKATSU, KATO, SHIGERU, OSADA, NAOMI, TAKANASHI, ITSUO, TANAKA, HIDESHI
Applicants: VICTOR COMPANY OF JAPAN, LIMITED
Application year: 1988
Main classification: B41J11
IPC codes: B41J11, B65H1, B41J17