Recording apparatus

Abstract: A recording apparatus includes a roll of recording paper conveying roller (20) for feeding a roll of recording paper (21) and a sheets of recording paper conveying roller (4) for feeding sheets of recording paper, and power force from a DC motor (23) is transmitted to these rollers through a switching mechanism. The switching mechanism includes a system gear (32), a planetary gear (7), and a planetary gear arm (25). The switching mechanism is further provided with a lock nail (26) for fixing planetary gear arm (25) at a prescribed position. Further in cooperation with the switching mechanism, a head release cam (15), a head release pulley (16) and a timing belt (9) for moving a recording head (10) are provided. Thus, roll of recording paper and sheets of recording paper can separately used as needed, and the manufacturing cost and size of the apparatus can be reduced.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates generally to recording apparatuses such as facsimile machine, and more specifically, to a recording apparatus permitting selective use of recording paper in the form of roll and recording paper in the form of sheets as needed. Description of the Related Art Conventionally, a facsimile machine has been known as one example of a recording apparatus. The facsimile machine optically scans an original, converts the scanned data into an electrical signal for transmission, and conducts recording in response to a signal received at a receiver which is synchronously operated with the transmitter. A roll of recording paper and sheets of recording paper had been used as recording paper at the time of recording. Fig. 10 is a view schematically showing the structure of one example of a facsimile machine using a roll of recording paper. Fig. 11 is a view schematically showing a structure of one example of a conventional facsimile machine using sheets of recording paper. Referring to Fig. 12, facsimile machine 101 includes read unit 102 for reading information to be transmitted, a roll of recording paper 104, a platen roller 105 for conveying the roll of recording paper, and a thermal head 106 for recording received information onto the roll of recording paper 104. At the time of transmission, an original 103 having transmission information is passed on read unit 102 for reading of the information, and the read information is transmitted. At the time of reception, the roll of recording paper 104 is fed by platen roller 105, and at that time received information is recorded on the roll of recording paper 104 using thermal head 106. Now, referring to Fig. 13, a facsimile machine 107 using sheets of recording paper 111 includes a read unit 108, a thermal head 113, a platen roller 112, the sheets of recording paper 111, and a cassette for housing the sheet of recording paper 111. When received information is recorded, the sheets of recording paper 111 are conveyed by platen roller 112, and the received information is recorded using thermal head 113. Such a facsimile machine using only a roll of recording paper or sheets of recording paper is however encountered with the following disadvantages. When facsimile machine 101 using the roll of recording paper 104 is provided with a copying function, and used as a simple copier, an empty space is left at a tip end of the recording paper, and therefore the length of recording paper after being copied is longer than the original. The roll of recording paper 104 tends to roll after released. Therefore, a roll of recording paper suffers from inconvenience in filing after the copying. Meanwhile, the facsimile machine 107 using sheets of recording paper is encountered with a disadvantage in recording received data. Received information is recorded together with the records of a transmitting party. Therefore, image data must be reduced for recording or data for one sheet must be recorded in two sheets. When image data is reduced, the recorded image is sometimes too small to read. When data for one sheet is divided into two sheets in recording, it will be necessary to join these two sheets of recording paper later, which results in waste of recording paper. Furthermore, data in far excess of the amount which can be recorded on sheets of recording paper is received, a large number of RAMs should be provided for recording the data, resulting in cost increase. In view of the foregoing, a facsimile machine using a roll of recording paper in recording received data and sheets of recording paper in copying is disclosed in Japanese Patent Publication JP-A-56 164 674. Fig. 14 is a view schematically showing the structure of the facsimile machine disclosed in Japanese Patent Publication JP-A-56 164 674 which includes both a roll of recording paper and sheets of recording paper. It is noted that for ease of description, only the part which is supposed to be necessary in conjunction with the following description is set forth in Fig. 14, and the other part is omitted. Referring to Fig. 14, facsimile machine 114 includes a reading portion 115 for reading information on an original surface, and a recording portion 116 for recording received information onto recording paper. Recording portion 116 includes sheets of recording paper for copying 117, a cassette 117a for housing the sheets of recording paper 117 and a paper feeding roller 118 for feeding sheets of recording paper 117 in the direction of a conveying path, a roll of recording paper 119, paper feeding rollers 120 for feeding the roll of recording paper 119 in the direction of the conveying path, a cutter 121 for cutting the roll of recording paper 119 into a prescribed length, holding rollers 122, guide plates 123, 124, timing rollers 125, a recording head 126, a presser plate 127, a guide nail 128, a solenoid 131 for operating the guide nail, a first discharge tray 129 for accommodating recording paper for copying, and a second discharge tray 130 for accommodating recording paper for facsimile reception. In thus structured facsimile machine 114, in copying, a sheet of recording paper 117 is conveyed by paper feeding roller 118, the timing for the recording paper is adjusted by timing rollers 125, and then the sheet is conveyed to recording head 126. After information read by recording head 126 is recorded on the recording paper, the sheet of recording paper 117 is accommodated in the first discharge tray 129. When received information is recorded, roll of recording paper 119 is used. The roll of recording paper 119 is conveyed by paper feeding rollers 120 and holding rollers 122, the timing for the recording paper is adjusted by timing roller 125, and then the recording paper is conveyed to recording head 126. After received information is recorded by recording head 126, the paper is cut into a prescribed length by cutter 121 and accommodated into second discharge tray 130. As described above, facsimile machine 114 uses the roll of recording paper 119 for recording received information and the sheets of recording paper 117 for copying, and therefore the main disadvantage of the above-described conventional facsimile machine should be virtually overcome. The above-described facsimile machine 114 is however still encountered with the following disadvantage. It will be necessary to independently provide a power source for conveying the roll of recording paper 119 and a driving source for conveying the sheets of recording paper in the above-described facsimile machine 114. More specifically, at least two power sources will be necessary for conveying recording paper. Therefore, excess space will be necessary for accommodating these power source, resulting in increase of manufacturing cost. In the above-described facsimile machine 114, received information is always recorded on the roll of recording paper 119. The roll of recording paper 119 however tends to roll after discharge and therefore it is desirable to use sheets of recording paper for the sake of filing convenience. Accordingly, as long as the amount of received data is within the amount which permits use of sheets of recording paper, it is desirable to record received information onto sheets of recording paper. Documents JP-A-56 164 674 and DE-A-40 22 883 disclose each a recording apparatus, comprising a recording portion for recording an image on recording paper; first paper feeding means for feeding first recording paper to said recording portion; and second paper feeding means for feeding second recording paper to said recording portion. Document US-A-4 866 531 discloses in a facsimile apparatus a recording medium feeding device which uses one bidirectional motor for driving according to its rotational direction one of the first and second feed rollers. It is an object of the invention to provide a recording apparatus permitting reduction of the size of the machine and the manufacturing cost, and selection of recording paper depending upon the amount of information received, by the provision of a common power source for conveying roll of recording paper and sheets of recording paper. SUMMARY OF THE INVENTION A recording apparatus according to the invention includes a recording portion for recording an image on recording paper, a first paper feeding portion for feeding first recording paper to the recording portion, a second paper feeding portion for feeding second recording paper to the recording portion, a common driving motor for operating first and second paper feeding portions, and a switching mechanism for selectively transmitting driving force from the driving motor to the first paper feeding portion or the second paper feeding portion. As described above, the recording apparatus according to the invention includes the switching mechanism for selectively transmitting driving force from the driving motor to the first paper feeding portion or the second paper feeding portion. Thus, the first and second paper feeding portions can be operated by a single driving motor. The first recording paper or second recording paper can be selected as needed. The above-described first paper feeding portion includes a first driving force transmitting portion to which the driving force from the driving motor is transmitted through the above-described switching mechanism, while the above-described second paper feeding portion includes a second driving force transmitting portion to which the driving force from the driving motor is transmitted through the above-described switching mechanism. The switching mechanism preferably includes a first gear to which the driving force is transmitted from the driving motor, a second gear for selectively transmitting the force transmitted to the first gear to the first driving force transmitting portion or the second driving force transmitting portion, and a holding member holding the second gear rotatably at the first gear for pivoting the second gear with rotation of the first gear, thereby moving the second gear to the first driving force transmitting portion or the second driving force transmitting portion. As described above, the switching mechanism preferably includes the first gear, the second gea=, and the holding member. The second gear is attached to the first gear through the holding member. Therefore, the holding member and second gear move with the rotation of the first gear. Thus, the second gear can be selectively moved to the first driving force transmitting portion or the second driving force transmitting portion by the rotation of the first gear. Consequently, driving force from the common driving motor can selectively be transmitted to the first paper feeding portion or second paper feeding portion. The recording apparatus according to claim 4, includes a recording portion having a recording head for recording an image on recording paper, and a cooperative operation portion for operating the first gear and the recording portion in cooperation, thereby moving the recording head. As described above, the recording apparatus further includes the cooperative portion for operating the first gear and recording portion in cooperation, thereby moving the recording head. Thus, operation of the first gear permits the movement of the recording head together with the first gear. Thus, operation of the first gear permits the recording head to change its state from the state in which recording paper can be recorded to the state in which the recording paper cannot be recorded. More specifically, the recording head can be enabled to record only at the time of recording. The recording apparatus according to claim 6, includes a holding member control portion for fixing the holding member to a first position for transmitting the driving force to the first paper feeding portion, or to a second position for transmitting the driving force to the second paper feeding portion. As described above, the recording apparatus according to claim 6 additionally includes the holding member control portion. Thus, the holding member can be fixed to the first position for transmitting the driving force to the first paper feeding portion or to the second position for transmitting the driving force to the second paper feeding portion when the driving force is selectively transmitted to the first paper feeding portion or the second paper feeding portion. A recording apparatus according to claim 9 includes a first accommodation portion for accommodating first recording paper, a second accommodation portion for accommodating second recording paper, a recording portion for recording an image on recording paper, a first paper feeding portion for taking out the first recording paper from the first accommodation portion and feeding it to the recording portion, a second paper feeding portion for taking out the second recording paper from the second accommodation portion and feeding it to the recording portion, a common driving motor for operating the first and second paper feeding portions, a switching mechanism for selectively transmitting driving force from the driving motor to the first paper feeding portion or second paper feeding portion, a sensor for detection of whether or not the first recording paper still remains at the first accommodation portion, a control portion for making such a control that the switching mechanism is operated in response to the detection of the first recording paper not remaining at the first accommodation portion by the sensor and driving force from the driving motor is transmitted to the second paper feeding portion. A recording apparatus according to claim 9 includes a sensor for detecting whether or not the first recording paper remaining at the first accommodation portion. Thus, whether or not the first recording paper is left at the first accommodation portion can be detected. The sensor is connected to the control portion, and the switching mechanism is operated by the control portion in response to the detection of the first recording paper not remaining at the first accommodation portion by the sensor. As a result, the driving force from the driving motor is transmitted to the second paper feeding portion. Thus, if the first recording paper runs out, the second recording paper can automatically be fed to the recording portion. The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing the structure of a facsimile machine according to a first embodiment of the invention; Fig. 2 is a view schematically showing the structure of a switching mechanism in the facsimile machine according to the first embodiment of the invention; Fig. 3A is a view for use in illustration of how a roll of recording paper is fed in a facsimile machine according to the invention; Fig. 3B is a view for use in illustration of a neutral state in a facsimile machine according to the invention; Fig. 3C is a view for use in illustration of how a sheet of recording paper is fed in a facsimile machine according to the invention; Figs. 4A-4F are views showing 1st-6th stages in a switching operation from the state of feeding a roll of recording paper to the neutral state; Figs. 5A-5F are views showing 1st-6th stages in a switching operation from the neutral state to the state of feeding sheets of recording paper; Figs. 6A-6F are views showing 1st-6th stages in a switching operation from the neutral state to the state of feeding a roll of recording paper; Fig. 7 is a timing chart for use in illustration of the switching operation shown in Fig. 4; Fig. 8 is a timing chart for use in illustration of the switching operation shown in Fig. 6; Fig. 9 is a timing chart for use in illustration of the switching operation shown in Fig. 5; Fig. 10 is a view schematically showing the structure of a facsimile machine according to a second embodiment of the invention; Fig. 11 is a block diagram schematically showing the characteristic portion of the facsimile machine according to the second embodiment of the invention; Fig. 12 is a view schematically showing the structure of one example of a conventional facsimile machine using only a roll of recording paper; Fig. 13 is a view schematically showing the structure of one example of a conventional facsimile machine using only sheets of recording paper; and Fig. 14 is a view schematically showing the structure of one example of a conventional facsimile machine using a roll of recording paper and sheets of recording paper. DESCRIPTION OF THE PREFERRED EMBODIMENTS Now, a facsimile machine according to a first embodiment of the invention will be described in conjunction with Figs. 1-9. Fig. 1 is a view schematically showing the structure of the facsimile machine according to the first embodiment of the invention. Fig. 2 is a view showing the structure of the switching mechanism in Fig. 1. The drawings showing embodiments which will be described below do not show the part provided with a copying function. However, the switching mechanism according to the invention is useful regardless of the presence/absence of the copying function. Referring to Fig. 1, facsimile machine 1 includes a read unit 12 for reading transmitted information, a DC motor 23 to be power source for conveying recording paper, a system gear 32 constituting the essential part of the switching mechanism, a roll of recording paper 21, a roll of recording paper conveying rollers 20 for conveying the roll of recording paper 21, sheets of recording paper 2, a recording paper cassette 3 for accommodating the sheets of recording paper 2, a sheet of paper conveying roller 4 for conveying the sheets of recording paper 2, a first idler gear 5a for transmitting driving force to sheet of paper conveying roller 4, a second idler gear 5b, a conveying path 33 for conveying the sheets of recording paper 2 or the roll of recording paper 21, and a recording portion 34 for recording an image on recording paper. An original conveying roller 14 for conveying an original 13 is provided at a position opposite to the reading surface of read units 12. The original 13 with transmitted information thereon is conveyed on the reading surface in read unit 12 by original conveying roller 14. Thus, reading of the received information is performed. DC motor 23 is provided with a worm gear 22 for driving a system gear 32. System gear 32 is driven by worm gear 22. A planetary gear arm 25 is rotatably provided to system gear 32. A planetary gear 7 is rotatably provided to one end of planetary gear arm 25 for selectively transmitting driving force transmitted to system gear 32 to roll of recording paper conveying roller 20 or first idler gear 5a. A lock nail 26 for controlling the operation of planetary gear arm 25 is inserted in system gear 32. System gear 32 is further provided with a gear position detection sensor 31. System gear 32 itself is formed of a worm wheel 27, a head releasing drive pulley 28, a sun gear portion 29 and a gear position detection cam 30. A lock nail driving groove 24 for driving the above-described lock nail 26 is provided inside system gear 32. A raised portion is provided at a prescribed position at the bottom of lock nail driving groove 24. Lock nail 26 is driven along lock nail driving groove 24. More specifically, lock nail 26 reciprocates in the direction of the diameter of system gear 32 by the rotation of lock nail driving groove 24 according to the rotation of system gear 32. Recording paper conveying path 33 is so structured that a path for conveying the roll of recording paper 21 and a path for conveying the sheets of recording paper 2 are joined at a prescribed position. Roll of recording paper conveying roller 20 is provided in the path of conveying roll of recording paper 21, and a roll of recording paper sensor 19 is provided in the vicinity of the joining position of these conveying paths. Thus, it can be determined whether or not the roll of recording paper 21 is in the vicinity of the joining position in the conveying path 33. Meanwhile, sheets of recording paper conveying roller 4 is provided at a prescribed position on the sheets of recording paper 2, and is connected with planetary gear 7 through first idler gear 5a and second idler gear 5b. A sheet of recording paper sensor 6 is provided at a prescribed position in the conveying path for sheets of recording paper 2. A recording paper storage 8, an A4 detection sensor 17, and a recording portion 34 are provided at the portions after the joining position of the sheets of recording paper conveying path and roll of recording paper conveying path. Recording portion 34 includes a printing head 10, a head release cam 15, and a head release pulley 16. Head release pulley 16 is connected to head releasing driving pulley 18 through a timing belt 9. Thus, head release pulley 16 is rotated with the rotation of head releasing drive pulley 28 due to the rotation of system gear 32. Thus, head release cam 15 is rotated and the position of printing head 10 moves. A platen roller 11 is provided at a prescribed position opposite to printing head 10 in recording portion 34. Recording paper recorded with printing head 10 is conveyed by platen roller 11. The switching mechanism in facsimile machine 1 will be described in more detail in conjunction with Fig. 2. Referring to Fig. 2, sun gear 29 in system gear 32 engages with planetary gear 7 to transmit force from system gear 32. A portion 29a having a diameter approximately identical to sun gear 29 is provided, which is not transmitted with the driving force, because it does not engage with planetary gear 7. More specifically, sun gear 29 rotates due to the rotation of system gear 32 and driving force is transmitted only when sun gear 29 and planetary gear 7 come into engagement. A recess 30a is provided to gear position detection cam 30, and detection of recess 30a using gear position detection sensor 31 permits detection of the initial position of the rotation of system gear 32. Lock nail 26 is mated with lock nail driving groove 24, and disposed in contact with the bottom surface of lock nail driving groove 24. Lock nail 26 has a projection (not shown) on the side of system gear 32 (on the side of the contacting surface between lock nail 26 and the bottom of lock nail driving groove 24). The projection is provided to extend in a direction crossing the upper surface 25a of planetary gear arm 25. Engagement of the projection with planetary gear arm 25 can restrict the pivotal movement of planetary gear arm 25. The lock nail 26, as indicated by arrow in Fig. 2, reciprocates in a direction toward system gear 32 or in a direction away from system gear 32. If, for example, system gear 32 rotates anticlockwise, planetary gear 7 engages with first idler gear 5a, but if lock nail 26 is close to system gear 32, planetary gear arm 25 is prohibited from rotating clockwise by the function of the above-described projection of lock nail 26. More specifically, by the function of lock nail 26, planetary gear arm 25 is fixed to the position at which driving force can be transmitted to first idler gar 5a. Accordingly, the driving force can be transmitted to sheet of recording paper conveying roller 4, and sheets of recording paper 2 can be fed to recording portion 34. Sheets of recording paper conveying roller 4 includes a sheet of recording paper conveying gear 4a, and the driving force is transmitted to sheets of recording paper conveying gear 4a from second idler gear 5b. This rotates sheets of recording paper conveying roller 4. Meanwhile, a roll of recording paper conveying gear 20a is provided coaxially to roll of recording paper conveying roller 20 and the driving force from planetary gear 7 is transmitted to roll of recording paper conveying gear 20a. As a result, roll of recording paper conveying roller 20 is rotated, and the roll of recording paper 21 is fed to recording portion 34. As described above recording head 10 in recording portion 34 is provided to operate together with head releasing drive pulley 28 in system gear 32, and in this case it moves in the direction indicated by the arrow in the figure by the rotation of head release pulley 16 and head release cam 15. Thus, pressure by printing head 10 upon platen roller 11 can be reduced or eliminated. The operation of facsimile machine 1 having the above-described structure will be described in conjunction with Figs. 3-9. Fig. 3A illustrates the state in which the roll of recording paper 21 can be fed, Fig. 3C the state in which sheets of recording paper 2 can be fed, and Fig. 33 the state of transition between the state of feeding roll of recording paper and the state of feeding sheets of recording paper. Referring to Figs. 3A-3C, the state of machine can be moved from the state of conveying the roll of recording paper 21 (Fig. 3A) to the neutral state (Fig. 3B) by rotating system gear 32 normally (anticlockwise). Then, the state moves to the state of conveying sheets of recording paper 2 (Fig. 3C) by further rotating system gear 32 normally. When a transition is made from the state of feeding sheets of recording paper (Fig. 3C) to the state of feeding roll of recording paper (Fig. 3A), first the sheets of recording paper are discharged by platen roller 11. Then, the state is moved from the state of feeding sheets of recording paper (Fig. 3C) to the neutral state (Fig. 3B). Then, system gear 32 is reversely (clockwise) rotated, and the state is moved from the neutral state (see Fig. 3B) to the state of feeding roll of recording paper (Fig. 3A). The above-described switching operation will be described in more detail in conjunction with Figs. 4 to 9. Figs. 4A-4F are views showing step by step the switching operation from the state of feeding roll of recording paper (Fig. 3A) to the neutral state (Fig. 3B). Fig. 7 is a timing chart when the above-described switching operation is made. Referring to Figs. 4A-4F, and 7, switching of the state from the state of feeding roll of recording paper to the neutral state can be performed by a single rotation of system gear 32 in the normal direction. As illustrated in Fig. 4A, a mode switching key is turned on and platen roller 11 is rotated normally (anticlockwise) at a rotating speed of about 400pps. Thus, part of roll of recording paper 21 yields at recording paper storage 8. After rotating platen roller 11 for a prescribed amount, as illustrated in Fig. 4B, DC motor 23 to be a power source is turned on to rotate worm gear 22 reversely. Thus, system gear 32 rotates in the normal direction. At that time, the rotation of system gear 32 rotates head releasing drive pulley 28 and head release cam 15 is rotated in response. Thus, the pressure upon printing head 10 is reduced or eliminated. System gear 32 further rotates, and as illustrated in Fig. 4C, sun gear 29 comes to into engagement with planetary gear 7. Thus, planetary gear 7 rotates in the reverse direction, and then roll of recording paper conveying gear 20a (not shown) in engagement with planetary gear 7 rotates reversely. Thus, roll of recording paper conveying roller 20 rotates reversely, and roll of recording paper 21 in the conveying path is withdrawn. At that time, although force in the direction of anticlockwise rotation is effected upon planetary gear arm 25, the pivotal movement of planetary gear arm 25 is restricted by lock nail 26 positioned on the side of system gear 32. Thus, planetary gear 7 continues to be in engagement with roll of recording paper conveying gear 20a. System gears 32 continues to rotate normally, and the roll of recording paper is gradually withdrawn as a result. As illustrated in Fig. 4D, A4 detection sensor 17, and roll of recording paper detection sensor 19 in turn attain an out of paper state (OFF state). Then, platen roller 11 stops rotating when A4 detection sensor 17 attains the out of paper state or after rotation for a fixed amount. Then, according to the rotation of system gear 32, lock nail 26 is moved in the direction away from system gear 32 by the function of lock nail driving groove 24 integrated with system gear 32. This permits anticlockwise direction of planetary gear arm 25. At that time, such adjustment that the tip end of roll of recording paper comes between roll of recording paper detection sensor 19 and roll of recording paper conveying roller 20 by appropriately setting the diameters of sun gears 29 and roll of recording paper conveying roller 20 in system gear 32, and a speed reducing ratio from a sun gear 29 to roll of recording paper conveying roller 20. When planetary gear arm 25 is enabled to rotate anticlockwise, it immediately rotates anticlockwise and as illustrated in Fig. 4E, planetary gear 7 comes to a position in engagement with first idler gear 5a. However, sun gear 29 in system gear 32 has passed planetary gear 7 and therefore planetary gear 7 and sun gear 29 do not engage with each other. Accordingly, the driving force of system gear 32 is not transmitted to first idler gear 5a through planetary gear 7. Accordingly, sheets of recording paper conveying roller 4 scarcely rotates. When system gear 32 makes just one rotation from the state shown in Fig. 4A, as illustrated in Fig. 4F, gear position detection sensor 31 detects the recess in gear position detection cam 30. Thus, gear position detection sensor 31 attains an ON state, at which point DC motor 23 is turned off. Thus, the rotation of system gear 32 stops. Head releasing cam 15 operating with system gear 32 stops rotating, and the original state shown in Fig. 4A is attained, in other words pressure to printing head 10 is regained. As described above, one rotation of system gear 32 in the normal direction from the state of feeding roll of recording paper permits switching the state to the neutral state. Referring to Figs. 5A to 5F, the switching operation from the neutral state (Fig. 3 B) to the state of feeding sheets of recording paper (Fig. 3C) will be described. Figs. 5A-5F are views showing state by state the switching operation from the neutral state to the state of feeding sheets of recording paper. Fig. 9 is a timing chart for use in illustration the above-described switching operation. An operation of feeding sheets of recording paper is performed by rotating system gear 32 in the normal direction from the neutral state (Fig. 3B). DC motor 23 is rotated reversely from the neutral state (Fig. 3A), which rotates system gear 32 in the normal direction. Thus, as illustrated in Fig. 5A, head release cam 15 rotates together with the rotation of system gear 32. Thus, pressure to printing head 10 is reduced. Thereafter, system gear 32 further rotates, and sun gear 29 comes into engagement with planetary gear 7. Thus, the rotation torque of system gear 32 is transmitted to sheets of recording paper conveying roller 4 through planetary gear 7, first idler gear 5a and second idler gear 6b. As illustrated in Fig. 5B, sheets of recording paper conveying roller 4 starts rotating as a result. By the rotation of sheets of recording paper conveying roller 4, as illustrated in Fig. 5C, the sheets of recording paper 2 accommodated in recording paper cassette 3 are conveyed, and the presence/absence of sheets of recording paper 2 in the conveying path is detected by sheets of recording paper detection sensor 6 provided in the conveying path. System gear 32 further rotates in the normal direction, and conveyance of sheets of recording paper is conducted. Thus, as illustrated in Fig. 5D, A4 detection sensor 17 provided in the downstream of sheets of recording paper detection sensor 6 in the recording paper conveying path attains an ON state, in other words obtains a recording paper present state. At that time, as illustrated in Fig. 5D, the sheets of recording paper 2 has its tip end abutted upon the vicinity of the contacting surface between printing head 10 and platen roller 11, and attains a somewhat yielded state. In response to this, as illustrated in Fig. 9, DC motor 23 is temporarily turned off, to temporarily stop the rotation of system gear 32. Then, as illustrated in Fig. 5E, platen roller 11 is rotated reversely at a speed of about 400pps for a prescribed time period. Thus, the tip end of the recording paper reaches a prescribed position, and the yielding of the recording paper disappears. Meanwhile, system gear 32, as illustrated in Fig. 5F, once again rotates reversely during the rotation of platen roller 11, and conveyance of sheets of recording paper 2 is conducted. According to the rotation of system gear 32, the recess 30a of gear position detection cam 30 rotating integrally with system gear 32 is detected by gear position detection sensor 31. Gear position detection sensor 31 thus attains an OFF state, in response to which DC motor 23 is turned off. At that time, head release cam 15 operating together with system gear 32 makes one rotation, and pressure upon printing head 10 is regained. As described above, one rotation of system gear 32 in the normal direction permits the state to be changed from the neutral state (Fig. 3B) to the state of feeding sheets of recording paper (Fig. 3C). The switching operation from the neutral state (Fig. 3B) to the state of feeding roll of recording paper (Fig. 3A) will be described in conjunction with Figs. 6A-6F. Figs. 6A-6F are views showing step by step the switching operation from the neutral state (Fig. 3B) to the state of feeding roll of recording paper. Fig. 8 is a timing chart for use in illustration of the above-described switching operation. The switching operation from the neutral state (Fig. 3B) to the state of feeding roll of recording paper (Fig. 3A) is performed by rotating system gear 32 once in the reverse direction. As illustrated in Fig. 6A, rotating DC motor 23 in the normal direction at a rotating speed of about 400pps permits rotation of system gear 32 in the reverse direction. Thus, head release cam 15 operating together with system gear 32 rotates, thus reducing pressure upon printing head 10. Lock nail 26 is moved in a direction away from system gear 32 by the function of lock nail driving groove 24 provided integrally with system gear 32. This permits planetary gear arm 25 fixed by lock nail 26 to rotate freely. When system gear 32 is further rotated reversely from the above-described state, sun gear 29 in system gear 32 comes into engagement with planetary gear 7. At that time, since planetary gear arm 25 is not restricted by lock nail 26, planetary gear arm 25 pivots in the reverse direction by the force between the teeth of sun gear 29 and planetary gear 7. Accordingly, as illustrated in Fig. 6, planetary gear 7 comes into engagement with a roll of recording paper conveying gear (not shown). Thus, the rotation torque of system gear 32 is transmitted to roll of recording paper conveying roller 20 through planetary gear 7 and the roll of recording paper conveying gear. Thus, the roll of recording paper 21 is sent out to the side of platen roller 11. When system gear 32 is further rotated, as illustrated in Fig. 6C, the tip end of roll of recording paper 21 passes roll of recording paper detection sensor 19 (roll of recording paper detection sensor is turned on). Then, system gear 32 is further rotated, and as illustrated in Fig. 6D, the tip end of roll of recording paper 21 reaches A4 detection sensor 17. Thus, A4 detection sensor 17 attains an ON state, in other words attains a paper present state. After system gear 32 rotates for a fixed amount, it starts rotating platen roller 11 reversely. When system gear 32 is further rotated from the above-described state, as illustrated in Fig. 6E, sun gear 29 in system gear 32 and planetary gear 7 do not engage with each other. More specifically, the roll of recording paper is no longer conveyed by roll of recording paper conveying roller 20. However, since the tip end of the roll of recording paper has already reached platen roller 11 by conveyance, the roll of recording paper 21 is conveyed by platen roller 11. Platen roller 11 stops after rotating for a fixed amount as illustrated in Fig. 8. System gear 32 further rotates reversely, and as illustrated in Fig. 6F, gear position detection sensor 31 detects recess 30a in gear position detection cam 30 rotating integrally with system gear 32. More specifically, the initial position of system gear 32 is detected. Accordingly, DC motor 23 is turned off, thus stopping the rotation of system gear 32. At that time, head release cam 15 operating together with system gear 32 makes one rotation, and pressure upon printing head 10 is regained. Going through the above-described operations, supply of a roll of recording paper or sheets of recording paper is selected. Note that in the above-described first embodiment, one example of the switching mechanism has been described, the machine may have a switching mechanism with a structure different from the above. Any mechanism can be employed if it transmits driving force from a common source in supplying the two kinds of recording paper and has a gear mechanism for supplying the respective kinds of recording paper utilizing the transmitted force. Thus, the manufacturing cost and the size of the facsimile machine can be reduced. If it is equipped with means for determining the amount of received information, recording paper may be selected appropriately depending upon the amount of received information. Now, referring to Figs. 10 and 11, a second embodiment of the invention will be described. Fig. 10 is a view schematically showing the structure of a facsimile machine according to the second embodiment of the invention. Fig. 11 is a block diagram showing the structure of the facsimile machine according to the second embodiment of the invention. Referring to Fig. 10, the facsimile machine according to the embodiment includes a cartridge sensor 40 in addition to the above-described switching mechanism. Cartridge sensor 40 as in the state shown in Fig. 10 is for detecting whether or not the sheets of recording paper 2 being left in recording paper cassette 3. The absence of sheets of recording paper 2 in recording paper cassette 3 is detected by cartridge sensor 40, and the roll of recording paper 21 can automatically be supplied to recording portion 34 by operating the switching mechanism. Thus, even if the sheets of recording paper 2 run out during recording of received information, the roll of recording paper 21 is automatically sent into recording portion 34. Consequently, interruption of recording operation by the lack of recording paper during recording of received information can be avoided. In the embodiment shown in Fig. 10, a contacting type sensor having an actuator lever is used for the above-described cartridge sensor 40. However, the sensor may be of any type such as a reflective type sensor including a light emitter or a transmission type sensor provided with a light emitter at the bottom of recording paper cassette 3. Now, the characteristic operation of the above-described embodiment will be described in more detail in conjunction with Fig. 11. Referring to Fig. 11, cartridge sensor 40 is connected to a central processing unit 50. Central processing unit 50 is connected to DC motor 23 provided in a switching mechanism 51. When cartridge sensor 40 detects the absence of sheets of recording paper 2 in recording paper cassette 3, that information is sent to central processing unit 50. Central processing unit 50 controls the operation of DC motor 23, and operates switching mechanism 51. More specifically, switching mechanism 51 is operated from the state of feeding sheets of recording paper 2 to the state of feeding roll of recording paper 21 by conducting the same switching operation as the above-described first embodiment. Thus, even if the sheets of recording paper 2 run out, recording can be continued using roll of recording paper 21. More specifically, even if one recording paper (sheets of recording paper) runs out, recording can be conducted onto the other recording paper (roll of recording paper) without interrupting the recording operation. As a result, reception failures such as interruption of recording operation due to the lack of recording paper can be avoided. It is noted that in the above-described second embodiment, the roll of recording paper 21 can be supplied if the sheets of recording paper 2 run out. However, the invention is not limited to this, and the embodiment is applicable to the case in which the sheets of recording paper 2 are supplied in response to the detection of the lack of roll of recording paper 21. Printing head 10 in each of the above-described embodiments may be a thermal head. Furthermore, the method of recording may be of laser recording type or of ink jet recording type. According to the invention, supply of first recording paper or second recording paper can be selected as needed. Thus, if, for example, the amount of received information is small, sheets of recording paper can be selected as recording paper for the received information. More specifically, information can be recorded by selecting more suitable recording paper. In the recording apparatus according to the invention, a common power source can be used for operating the first and second paper feeding means. More specifically, driving force can be transmitted to the above-described first and second paper feeding means through the switching mechanism from the common power source. Thus, the manufacturing cost and size of the recording apparatus can be reduced. The above-described switching mechanism includes the holding member control means. Therefore, a switching operation can be conducted by a simple mechanism. The mechanism is further provided with a cooperative operation means moving the recording head by operating in cooperation with the operation of the switching mechanism. Thus, pressure upon the recording head can be reduced in parallel with the switching operation, and damages due to abrasion of the recording head can be prevented. More specifically, the recording apparatus according to the invention can operate a switching operation in a simple mechanism and can also provide a highly reliable recording apparatus. Furthermore, if equipped with a sensor for detecting whether or nor recording paper remaining in accommodation means for recording paper, even if a first kind of recording paper runs out during recording of received information, the sensor detects the absence of the first kind of recording paper to operate the switching mechanism, and a second kind of recording paper can automatically be supplied to the recording portion. Accordingly, interruption of the recording operation due to the lack of first kind of recording paper can be avoided. Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being limited only by the terms of the appended claims.

Claims: A recording apparatus, comprising: a recording portion (34) for recording an image on recording paper; first paper feeding means for feeding first recording paper (21) to said recording portion; second paper feeding means for feeding second recording paper (12) to said recording portion, characterized by a common driving motor (23) for operating said first and second paper feeding means; a switching mechanism for selectively transmitting driving force from said driving motor (23) to said first paper feeding means or said second paper feeding means, wherein said first paper feeding means includes a first driving force transmitting portion to which the driving force from said driving motor (23) is transmitted through said switching mechanism, said second paper feeding means includes a second driving force transmitting portion to which the driving force from said driving motor (23) is transmitted through said switching mechanism, said switching mechanism includes a first gear (32) to which the driving force from said driving motor is transmitted, a second gear (7) for selectively transmitting the driving force transmitted to said first gear (32) to said first driving force transmitting portion or said second driving force transmitting portion, and a holding member (25) holding said second gear (7) pivotally at said first gear (32) and pivoting according to the rotation of said first gear (32) for moving said second gear (7) to said first driving force transmitting portion or said second driving force transmitting portion; and wherein said first driving force transmitting portion includes a conveying roller (20) for conveying the first recording paper (21), said second driving force transmitting portion includes a conveying roller (4) for conveying the second recording paper (2), said first gear (32) includes a sun gear (29) rotating according to the rotation of said first gear (32), and said second gear is a planetary gear (7) engaged with said sun gear (29). A recording apparatus as recited in claim 1, wherein in the circumference of said sun gear (29), a substantially spherical portion (29a) without teeth for transmitting driving force is provided. A recording apparatus as recited in claim 2, wherein said first gear (32) has a gear position detection cam (30) for detecting the initial position of the rotation of the first gear (32). A recording apparatus as recited in claims 1 to 3, comprising a recording portion (34) having a recording head (10) for recording an image on recording paper; and cooperative operation means for operating said first gear (32) and said recording portion (34) in cooperation, thereby moving said recording head (10). A recording apparatus as recited in claim 4, wherein said cooperative operation means includes, a first pulley (28) provided coaxially with said first gear (32) for rotating according to the rotation of said first gear (32); a second pulley (16) provided at said recording portion (34); a head release cam (15) provided in contact with a surface of said recording head (10) for displacing said recording head (10) by rotating according to the rotation of said second pulley (16), and a belt (9) for coupling said first and second pulleys (28, 16). A recording apparatus as recited in claims 1 to 5, further comprising: a holding member control means for fixing said holding member (25) and said second gear (7) to a first position for transmitting driving force to said first paper feeding means or to a second position for transmitting driving force to said second paper feeding means. A recording apparatus as recited in claim 6, wherein said holding member control means has a pivotal movement control member (26) including a projection for engaging said holding member (25), thereby restricting the pivotal movement of said holding member (25). A recording apparatus as recited in claim 7, wherein a groove (24) for receiving said pivotal movement control member (26) is formed at said first gear (32), a raised portion is provided on the bottom of said groove (24) at a prescribed position, said pivotal movement control member (26) is so disposed that part of the surface of said pivotal movement control member (26) is in contact with the bottom of said groove (24), and said projection is provided to extend in a direction crossing the upper surface (25a) of said holding member (25) on the side of the surface of said pivotal movement control member (26) in contact with the bottom of said groove (24). A recording apparatus as recited in claims 1 to 8, further comprising: first accommodation means for accommodating first recording paper (21); second accommodation means for accommodating second recording paper (2); said first paper feeding means taking out said first recording paper (21) from said first accommodation means and feeding the paper to said recording portion; said second paper feeding means taking out said second recording paper (2) from said second accommodation means (3) and feeding the paper to said recording portion (34); a sensor (40) for detecting whether or not second recording paper (2) is remaining in said second accommodation means (3); and control means (50) for making such a control that said switching mechanism is operated in response to a detection of the absence of second recording paper (2) in said second accommodation means (3) by said sensor (40) and the driving force from said driving motor (23) is transmitted to said first paper feeding means. A recording apparatus as recited in claim 9, wherein said control means has a central processing unit (50), and said central processing unit (50) is connected to said sensor (40) and said driving motor (23) to control the operation of said driving motor (23) based on detection information by said sensor (40).

Inventors: KAWATSURI MASAYA, KIDA SHIGERU, SAKAI KATSUYUKI, SAKATA MANABU, KAWATSURI, MASAYA, KIDA, SHIGERU, SAKAI, KATSUYUKI, SAKATA, MANABU
Applicants: SHARP KK, SHARP KABUSHIKI KAISHA
Application year: 1993
Main classification: H04N1
IPC codes: G03G15, B41J13, H04N1, B65H3, B65H16