Construction of supporting shaft of roll paper

Abstract: The supporting shaft (24) of a roll paper, in which said roll paper is supported by means of first to third supporting pieces (d,e,f) touching internally an inner circumferential surface of a core cylinder of the roll paper at three points as seen in a longitudinal direction of said core cylinder comprises a first supporting member (72) provided with said first supporting piece (d) and a second supporting member (73) provided with said second supporting piece(e) which are fixed in opposition to each other by means of small-sized core shafts (74,75) provided at both ends in a longitudinal direction of said both supporting members. The core shafts fixedly mounting the first and second supporting members thereon are small-sized, so that not only the roll paper-supporting shaft can be reduced in weight and improved in assembly but also the cost of production can be reduced.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a construction of a supporting shaft supporting a roll paper. Description of the Prior Art In some of image-forming apparatus, such as copying machines, various kinds of printers and the like, a long paper rolled around a core cylinder, that is a so-called roll paper, is supplied. A supporting shaft supporting this roll paper. which touches internally an inner circumferential surface S of a core cylinder 96 of a roll paper at three points as seen in the direction of axis shaft line to support said roil paper, as shown in Fig. 15 and Fig. 16, has been known. This supporting shaft comprises a supporting member 91 having a first supporting piece (d) and a second supporting piece (e) and two pieces of flat plate member 92, 92 fixedly mounted on a core shaft 93, an arm 95 extending in the direction of axis shaft line of said core shaft 93 through a supporting shaft 94 meeting at right angles with an axis shaft line of the core shaft 93 pivoted on midway portions in the longitudinal direction of said flat plate members 92, 92, a saw-toothed third supporting piece (f) connected with a vicinity of said portion, on which said arm 95 is pivoted, and energizing means 97 for energizedly pressing said third supporting piece (f) against an inner circumferential surface S of a core cylinder 96. Referring to Figs. 15, 16, reference numeral 98 designates a balancer. With the above described construction, a roll paper-supporting shaft 99 can be easily inserted into and drawn out of the core shaft 93 by holding the arm 95 so as to approach to the core shaft 93 against an energizing force of said energizing means 97. In addition, also a construction of a supporting shaft of a roll paper, in which the above described arm 95 is omitted and end edges of the above described flat plate members 92, 92 are used as the third supporting piece so that these end edges may be engaged with an inner circumferential surface of a core cylinder, has been known. In this case, said core cylinder is supported at substantially three points by pushing said supporting shaft in the core cylinder. However, in every one of the above described constructions of a supporting shaft of a roll paper, a number of parts is increased, an assembly taking much time. and also a weight being increased. In particular, the core shaft 93 is heavy and it has been necessary to reduce the weight of the core shaft 93. Separately from the above described problem, a disadvantage has occurred in that a position of the third supporting piece (f) mounted on the arm 95 is limited by a vicinity of the portion, on which the arm 95 is pivoted, so that both sides in the longitudinal direction of the core cylinder 96 are apt to be swung in a radial direction of the core cylinder 96 with the third supporting piece (f) as a fulcrum, whereby the drawing out and supply of roll paper is getting instable, thus a bad paper-supply, such as oblique paper-supply, is apt to occur. SUMMARY OF THE INVENTION The present invention has been achieved in view of the above described problems and it is an object of the invention to provide a construction of a supporting shaft of a roll paper which is light and superior in assemblage. Further, the construction of a supporting shaft should be capable of preventing a roll paper from swinging in a radial direction to smoothly supply said roll paper by an improvement of a third supporting piece. In order to achieve the above described object in accordance with the invention, a construction of a supporting shaft of a roll paper is provided in which said roll paper is supported by means of first to third supporting pieces touching internally an inner circumferential surface of a core cylinder of the roll paper at three points as seen in a longitudinal direction of said core cylinder, characterized in that a first supporting member provided with said first supporting piece and a second supporting member provided with said second supporting piece are fixed in opposition to each other by means of a core shaft or two small sized core shaft portions provided in a longitudinal direction of said first and second supporting members. (claim 1) Depending claims 2 to 18 each specify an advantageous development thereof. According to a preferred alternative, the supporting shaft can be lightened and simply produced by fixedly mounting two supporting members on two small sized fixing shafts axially arranged to each other. And, the core cylinder of the roll paper is supported at first, second and third contact portions as seen in the direction of axis shaft line. According to a further advantageous development the core cylinder is not only supported by means of the supporting pieces of the first and second supporting members touching internally the inner circumferential surface of the core cylinder in the longitudinal direction but also by means of the supporting pieces of the third supporting member at separate two positions on both sides in at least the longitudinal direction, so that the roll paper can be prevented from being swung in the radial direction of the core cylinder. BRIEF DESCRIPTION OF THE DRAWINGS Fig.1 is a desintegrated perspective view showing a supporting shaft of a roll paper; Fig. 2 is an end view showing said supporting shaft; Fig. 3 is a side view showing the supporting shaft; Fig. 4 is a plan view showing the supporting shaft; and Fig. 5 is a perspective view showing the supporting shaft. Fig. 6 is a rough side view showing an image-forming apparatus; Fig. 7 is a longitudinally sectioned side view showing a body of paper-supply unit; and Fig. 8 is a longitudinally sectioned side view showing said body of paper-supply unit with a cover opened. Fig. 9(a), (b) is a digram describing operations of locking means and lock-releasing means; Fig. 10(a), (b), (c) is a diagram showing another preferred embodiment of said lock-releasing means; Fig. 11 is a longitudinally sectioned side view of the body of paper-supply unit showing another preferred embodiment of means for holding a pointed end of a roll paper; and Fig. 12 is an end view showing another preferred embodiment of the supporting shaft of a roll paper. Fig. 13 is a disintegrated perspective view showing a further preferred embodiment of the supporting shaft of a roll paper; and Fig. 14 is an end view showing the supporting shaft of a roll paper shown in Fig. 13. Fig. 15 is a disintegrated perspective view showing the conventional supporting shaft of a roll paper; and Fig. 16 is an end view showing the conventional supporting shaft of a roll paper. DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be below described with reference to the drawings. Fig. 6 is a block diagram showing one example of a copying machine (image-forming apparatus) to which a construction of a supporting shaft of a roll paper according to the present invention is applied and Fig. 7 and Fig. 8 is a side view showing a mounting of a roll paper on a body of roll paper-supply unit, respectively. A body of copying machine 2 is mounted on a movable deck 1 and a roll paper-supply unit 6 for cutting a roll paper 3 supported by means of a supporting shaft 24 in an appointed length to supply a paper-supply port 5 of said body 2 with a cut paper 4 is connected with the body 2. In addition, the body 2 is provided with an exposing portion 8 and manuscript-conveying means 9 in an upper portion of an apparatus case 7 thereof and a paper-supply cassette 10 for housing large-sized regular shaped papers in a lower portion of said apparatus case thereof so as to be freely drawn out toward the side of said roll paper-supply unit 6. A photoreceptor drum 11 is arranged below said exposing portion 8 and a charging device 12, a developing device 13, a transfer device 14, a separating device 15, a cleaning device 16 and the like are arranged along a direction of rotation of said photoreceptor drum 11. And, upon starting a transfer operation, a light from the exposing portion 8 is reflected by a manuscript and the resulting reflected light exposes the photoreceptor drum 11. On the other hand, a surface of the photoreceptor drum 11 is uniformly charged by means of said charging device 12 and an electrostatic latent image is formed by the above described exposure. The resulting electrostatic latent image is subjected to a toner-development by means of said developing device 13 and then transferred on said cut paper 4, said regular shaped paper 4 from said paper-supply cassette 10 and the like (hereinafter referred to as cut paper 4 and the like) by means of said transfer device 14 followed by separating the cut paper 4 and the like from the photoreceptor drum 11 by means of said separating device 15. In addition, a paper-passing guide 17 is provided ranging from a paper-supply portion of the paper-supply cassette 10 to said paper-supply port 5 and a paper-supply conveying passage 18 ranging from the paper-supply port 5 to the transfer device on the upstream side in a conveying direction, whereby the photoreceptor drum II is supplied with the cut paper 4 and the like to carry out a transfer. A paper-discharging and conveying passage 19, a fixing device 20 and paper-discharging rollers 21 are provided on the downstream side in a conveying direction of the cut paper 4 and the like. The roll paper-supply unit 6 comprises a unit frame 23 mounted on the side of the paper-supply port 5 of the body of copying machine 2 through a connecting member 22 and a body of paper-supply unit 31 freely ascending and descending relatively to said unit frame 23. The unit frame 23 comprises vertical frames 26 standing on the right and left sides of a bottom frame 25, guide rails 27 provided on the before and behind sides of said vertical frames 26, a tie rod 28 extending over upper end portions of the right and left vertical frames 26 and spirally progressible casters 29 provided at four lower corners of said bottom frame 25 so as to be adjustable in horizontal level and movable. Said body 31 of paper-supply unit 31 comprises rollers 30 idly engaged with said guide rails 27 in the vicinities of four upper and lower corners of an ascending and descending frame 32, energizing means (for example gas springs) 33 provided on the right and left sides ranging from the bottom frame 25 to said ascending and descending frame 32 for liftingly energizing the ascending and descending frame 32 and inserting guides 36 of a supporting shaft 24 for supporting said roll paper 3 formed in right and left side plates 34 of the ascending and descending frame 32 to form a charging portion 37 of the roll paper 3, as shown in Fig. 7 and Fig. 8. In addition, axis shaft lines of said four upper and lower rollers 30 on the side of the body of copying machine 2 are directed in the right and left direction of the unit so that the roll paper-supply unit 6 may be prevented from being swung in the before and behind direction relatively to the body of copying machine 2. Furthermore, axis shaft lines of four upper and lower rollers 30 on the side opposite to the body of copying machine 2 are directed in the before and behind direction of the unit so that the roll paper-supply unit 6 may be prevented from being swung in the right and left direction relatively to the body of copying machine 2. Holding means 42 holding a pointed end of the roll paper by paper-supply roller means 40 comprising a pair of paper-supply rollers 38, 39 and a paper-supply guide 41 and cutting means 43 for cutting the roll paper 3 in an appointed length at an appointed timing are arranged in the midway of paper-passing passage ranging from a paper-support portion above said roll paper-charging portion 37 to a paper-discharging portion (a) toward the paper-supply port 5 of the body of copying machine 2. Besides, a paper-discharging guide plate 44 is obliquely provided so as to cover an upper side of said roll paper-cutting means 43, a cover 45 serving also as a paper-discharging guide being provided in said side plates 34 of the ascending and descending frame 32 in correspondence to the roll paper-charging portion 37 so as to be swingingly opened and closed around a supporting shaft 46 on the lower portion side, said paper-supply roller 38 of said paper-supply roller means 40 being mounted on the cover 5 on the side inward and upward from said cover 45 and opposite to the body of copying machine 2 with putting said paper-passing passage between the body of copying machine 2 and the paper-supply roller 38 so as to be idly turnable, and locking means 47 for locking the cover 45 at a closing position and lock-releasing means 48 for releasing a lock by said locking means 47 being provided. Referring to Fig. 6, reference numeral 49 designates a guide plate forming a paper-discharging passage in cooperation with the cover 45, reference numeral 50 designating a bent guide member arranged within a lower space of said movable deck 1, and a plate-like tray 51 connected with a lower portion side of said guide member 50 being provided below the unit frame 23. In addition, the cover 45 is provided with a window (not shown) formed therein for confirming a remaining quantity of the roll paper 3 charged in the roll paper-charging portion 37. Furthermore, said guide plate 49 is made of a transparent or translucent resinous material all over so that said remaining quantity of the roll paper 3 and the passage of the cut paper in the paper-discharging passage may be confirmed through said window. With the above described construction, the cut paper 4 supplied from the paper-supply cassette 10, the cut paper 4 manually supplied through the paper-supply port 5 or the so-called cut paper 4 obtained by cutting the roll paper 3 drawn out from the roll paper-supply unit 6 to be supplied to the paper-supply port 5 in an appointed timing, is discharged out of the apparatus through a pair of paper-discharging rollers 21 after the image-formation and the cut paper 4 is guided by means of said paper-discharging guide plate 44 and the cover 45 to arrive at said bent guide member 50 through the cover 45 and the guide plate 49. The pointed end of the cut paper 4 is brought into contact with a bent portion of the bent guide member 50 and a rear end of the cut paper 4 is fallen out from the guide plate 49 to take out the cut paper 4 above the bent guide member 50 and the tray 51. Said holding means 42 holding a pointed end of the roll paper has the following construction. That is to say, said paper-supply guide plate 41 is tiltedly provided on the upstream side of a cutter-case 52 covering a lower portion side of said roll paper-cutting means 43, said paper-discharging guide plate 44 being provided with a bracket 54 integrally connected therewith, and said bracket 54 being provided with holding member 55 connected therewith for holding the pointed end of the roll paper 3 in cooperation with the guide plate 41 under the condition that the small paper-passing passage is formed between said holding member 55 and the guide plate 41. Said locking means 47 comprises a lock lever 57 pivoted on a side plate 45a of the cover 45 through a supporting shaft 56 and engaging pins 59 projected on said side plates 34 of the ascending and descending frame 32 so as to be engaged with a hook 58 formed in a pointed end of said lock lever 57, as shown in Fig. 9(a). The lock lever 57 is rotatabty energized by a spring (not shown) in the direction that said hook 58 is engaged with said engaging pin 59 (counterclockwise direction in Fig. 9). Said lock-releasing means 48 comprises an operating member 61 pivoted on the front surface side ( right side in Fig. 9) of the cover 45 through a supporting shaft 60 and a lock-releasing shaft 62 inserted through a long hole (b) formed in said side palte 45a of the cover 45 and serving also as a supporting shaft of the guide plate 49. Said operating member 61 comprises a body 61a through which said supporting shaft 60 is inserted, a handle 61b projected on the front surface side of said body 61a and a shaft-holding portion 61c provided below the body 61a for rotatably holding said lock-releasing shaft 62. In addition, although it is not shown, the operating member 61 has a length ranging all over the width of the cover 45. Said lock-releasing shaft 62 is held by said shaft-holding portion 61c of the operating member 61 at a central portion thereof and both end portions projected outside through said long hole (b) from the side plates 45a of the cover 45 are engaged with side surfaces of riser members 57a of the lock levers 57 arranged on right and left side surfaces of the cover. And, the lock-releasing shaft 62 is pressed against the side of an inside of the apparatus of the long hole (b) by means of the lock levers 57. Thus, the lock-releasing shaft 62 and the operating member 61 can be prevented from being shaky during the time when the operating member 61 is not being operated. The lock is released by said lock-releasing means 48 in the following order. At first, said handle 61b is held to rotate the operating member 61 in the direction shown by a black arrow in Fig. 9(a). Thereupon, the lock-releasing shaft 62 held by the shaft-holding portion 61c of the operating member 61 is moved toward the side of a front surface of the cover 45 through the long hole (b), as shown by a white arrow in Fig. 9(a) and the lock levers 57 are rotated in a counterclockwise direction against the energizing force of the spring (not shown) with the supporting shaft 60 as a center with said movement of the lock-releasing shaft 62. And, as shown in Fig. 9(b), the engagement of the hook 58 formed in a pointed end of the lock lever 57 with the engaging pin 59 is released to release the lock of the cover 45. Subsequently, if the cover 45 is rotated with a supporting shaft 46 as a center to be opened, as shown in Fig. 8, the charging portion 37 of the roll paper 3 is opened widely and thus an operation of exchanging the roll paper 3 in the charging portion 37 can be easily conducted. And, upon inserting a pointed end of the roll paper 3 between the paper-supply guide plate 41 and said holding member 55 under the condition that the exchanged roll paper 3 corresponds to said paper-supply roller 39 on the side of the body of copying machine 2, said pointed end of the roll paper 3 can be skillfully inserted into said gap to be held since the roll paper 3 is curled even though the gap is wide to some extent. Accordingly, the pointed end of the roll paper can be prevented from sliding off the paper-supply guide plate 41 provided in a tilted manner until the cover 45 is closed and thus the pointed end of the roll paper 3 can be surely put between the paper-supply roller 38 and the paper-supply roller 39 and the exchanged roll paper 3 can be surely brought into a paper-supply posture by merely closing the cover 45. In addition, reference numeral W1 designates a wire for regulating a quantity of rotation of the cover 45 and hanging the opened cover 45 and reference numeral W2 designates a wire for hanging a pointed end of the guide plate 49 under the condition that the cover 45 is opened. Although the operating member 61 of the lock-releasing means 48 is provided all over the width of the cover 45 in the above described preferred embodiment, the shorter operating member 61, of which length is shorter than that all over said front surface of the cover, may be arranged in notched portions 49a formed in upper end portions of the guide plates 49 at both ends of the cover 45, as shown in Fig. 10(a) to (c). The operating member 61 comprises a body 61e rotatably supporting the supporting shaft 60 fixedly mounted on said side plate 45a of the cover 45 by means of a nut 63 by means of ribs 61d brought into contact with an outer circumference of the supporting shaft 60 from three directions, a handle 61f projected on the side of a front surface of said body 61e and a shaft-holding portion 61g provided below the body 61e for rotatably and movably up and down holding the lock-releasing shaft 62. In addition, the holding means 42 holding a pointed end of the roll paper may be modified as follows: That is to say, as shown in Fig. 11, the cover 45 of the roll paper-charging portion 37 is divided into an upper cover portion 45b and a lower cover portion 45c, the paper-supply roller 38 being put in said upper cover portion 45b so as to be idly rotated, the upper cover portion 45b being pivoted on said bracket 54 connected with the paper-supply guide plate 44 and an arm 64 being provided with an idle roller 65 to form said holding member 55 for holding a pointed end of the roll paper, and the holding member 55 being mounted on the bracket 54 connected with the paper-discharging guide plate 44 under the condition that said idle roller 65 is brought into contact with the paper-supply guide plate 41. Next, a concrete construction of said roll paper-supporting shaft 24 is described with reference to Figs. 1 to 5. In this roll paper-supporting shaft 24, a first supporting member 72 provided with a first supporting piece (d) brought into contact with an inner circumeferential surface S of a core cylinder 71 of the roll paper 3 in the longitudinal direction and a second supporting member 73 provided with a second supporting piece (e) brought into contact with said inner circumferential surface S of said core cylinder 71 are fixedly mounted on small-sized core shafts 74, 75 by means of screws and the like at both end portions thereof in opposition to each other, end portions of said core shafts 74, 75 being projected from end portions of said both supporting members 72, 73 so as to be rotatably supported relatively to said inserting guide 36, and the core shaft 75 being provided with a brake shoe 76 also serving as a handle. And, an arm 77 extending in the direction of axis shaft line of the core shafts 74, 75 is pivoted on a midway between both supporting members 72, 73 in the longitudinal direction so as to be swingable around a supporting shaft 78 meeting at right angles with said axis shaft lines of the core shafts 74, 75, a midway portion of a third supporting member 80 provided with saw-toothed third supporting pieces (f) on both sides in the longitudinal direction being pivotally connected with the vicinity of a portion, where said arm 77 is pivoted, through a pivoting shaft 79 parallel to said supporting shaft 78, and energizing means 81 for energizedly pressing said third supporting pieces (f) against the inner circumferential surface S of the core cylinder 71 being provided between the second supporting member 73 and the arm 77. Referring to Figs. 1 to 5, reference numeral 82a designates a screw screwed on a second regulating piece 87 (which will be detailly described later) of the second supporting member 73 through a hole (h) formed in the arm 77, a diameter of said hole (h) being set smaller than that of a screw head 82 so that the swing of the arm 77 resulting from an energizing force of said energizing means 81 may be regulated by an engagement of the arm 77 with said screw head 82, whereby forming the screw head 82 as a swing-regulating member 82 regulating a swinging range of the arm 77. The first and second supporting members 72, 73 have the same one shape, the first supporting piece (d) of the first supporting member 72 being bent at a first contact portion (i) against the inner circumferential surface S of the core cylinder to form a first extending portion 83 extending toward the side of a second contact portion (j) of said second supporting piece (e) against the inner circumferential surface S, the second supporting piece (e) of the second supporting member 73 being bent at said second contact portion (j) against the inner circumferential surface S to form a second extending portion 84 extending toward the side of said first contact portion (i) of said first supporting piece (i) against the inner circumferential surface S of the core cylinder, and extending ends of said first extending portion 83 and second extending portion 84 being bent toward the core shafts 74, 75 so that the extending bent ends may be engaged with each other. And, an arm-pivoting member 85 is bently connected with the first and second supporting members 72, 73 at a bending angle, for example 120°, a first regulating piece 86 extending toward said arm-pivoting member 85 of the second supporting member 73 under the condition that it is fixedly mounted by means of the core shafts 74, 75 being bently connected with one half of the arm-pivoting member 85 on the side of the first supporting member 72, and a second regulating piece 87 extending toward the side of the arm-pivoting member 85 of the first supporting member 72 under the condition that it is fixedly mounted by means of the core shafts 74, 75 being bently connected with a half on the other end side of the arm-pivoting member 85 on the side of the second supporting member 73 in the longitudinal direction so that the core shafts 74, 75 may be engaged with said first and second regulating pieces 86, 87. In addition, a pivotedly connecting position of the third supporting member 80 by said pivoting shaft 79 is slightly shifted in the extending direction of the arm 77 so that the side of a pointed end of the third supporting member 80 (the inserting side into the core cylinder 71) may be freely descended due to an unbalance of weight. With the above described construction, the core shafts 74, 75 fixedly mounting the first and second supporting members 72, 73 are small-sized, so that a weight can be reduced, and both supporting members 72, 73 have the same one shape, so that a number of parts can be substantially reduced and thus the cost can be reduced. In addition, the extending portions 83, 84 and the arm-pivoting members 85, 85 are bently connected with the first and second supporting members 72, 73, respectively, and the extending portions 83, 84 are engaged with each other, so that the first and second supporting members 72, 73 can be improved in rigidity and a jamming and the like resulting from a vibration of the roll paper 3 can be prevented and thus the roll paper 3 can be stably supplied. Furthermore, the regulating pieces 86, 87 are bently connected with both supporting members 72, 73 and the core shafts 74, 75 are engaged with the regulating pieces 86, 87, so that both supporting members 72, 73 and the core shafts 74, 75 can be simply fixed. On the other hand, when the roll paper-support shaft 24 is to be inserted in or drawn out of the core cylinder 71, the pivoting shaft 79 of the third supporting member 80 is pulled toward the side of the core shaft 75 to remove the supporting pieces (f), (f) of the third supporting member 80 from the inner circumferential surface S of the core cylinder 71 by approaching the arm 77 to one of the core shafts 75 against said energizing force of the energizing means 81. The supporting shaft 24 can be simply inserted in or drawn out of the core cylinder 71 of the roll paper 3 by this together with said matter that the side of said pointed end of the third supporting member 80 is freely descended. And, upon releasing the arm 77 after the supporting shaft 24 is inserted in an inside of the core cylinder 71, the arm 77 is swung toward the side of said swing-regulating member 82 around the supporting shaft 78 by the energizing force of the energizing means 81 and the energizing force of the energizing means 81 is applied to the pivoting shaft 79 through the arm 77, whereby the supporting pieces (f), (f) of the third supporting member 80 swingable around the pivoting shaft 79 are energizedly pressed against the inner circumferential surface S of the core cylinder 71 and thus the supporting pieces (d), (e) of the first and second supporting members 72, 73 are energizedly pressed against the inner circumferential surface S of the core cylinder 71 all over the length in the longitudinal direction. And, the roll paper 3 can be surely prevented from being swung in the radial direction by supporting the core cylinder by means of the supporting pieces (d), (e) of the first and second supporting members 72, 73 coming in contact with the inner circumferential surface S of the core cylinder 71 in the longitudinal direction together with holding the core cylinder by the supporting pieces provided at separate two places on the third supporting member 80, whereby the roll paper 3 can be stably drawn out to be supplied. In addition, although tile third supporting pieces (f), (f) are partially formed on both sides in the longitudinal direction of the third supporting member 80, a modification that the third supporting piece is provided at also a central portion in the longitudinal direction of the third supporting member 80 or the third supporting pieces (f), (f) are provided all over the length in the longitudinal direction of the third supporting member 80 is possible. Furthermore, also as for the supporting pieces (d), (e) of the first and second supporting members 72, 73, modifications that for example they are formed in a saw-toothed shape and they touch internally the inner circumferential surface S of the core cylinder 71 in the longitudinal direction intermittently are possible. Although the arm 77 is pivoted on the first and second supporting members 72, 73 and the third supporting member 80 provided with the third supporting pieces (f), (f) is pivoted on the arm 77 to achieve the in the above described preferred embodiment, the arm 77 and the third supporting member 80 may be omitted and arm-pivoting members 85, 85 bently connected with the first and second supporting members 72, 73 may be used as the third supporting members 80 and additionally end edges (f) of the third supporting members 80, 80 may touch internally the inner circumferential surface S of the core cylinder 71, as shown in Fig. 12. Besides, although the first and second supporting members 72, 73 of the roll paper-supporting shaft 24 are fixedly mounted on the small-sized core shafts 74, 75, an embodiment can be achived also by replacing the small-sized core shafts 74, 75 with a single shaft-structured core shaft 74 and fixedly mounting the first and second supporting members 72, 73 on this core shaft 74, as shown in Fig. 13. This roll paper-supporting shaft 24, as shown also in Fig. 14, comprises the first supporting member 72 provided with the first supporting piece (d) touching internally the inner circumferential surface S of the core cylinder 71 of the roll paper in the longitudinal direction and the second supporting member 73 having the same one shape as that of the first supporting member 72 and provided with the second supporting piece (e) touching internally the inner circumferential surface S of the core cylinder 71 in the longitudinal direction fixedly mounted on said single core shaft 74 by means of a screw and the like in opposition to each other so that an end portion of the core shaft 74 may be projected over the end portions of both supporting members 72, 73 and the brake shoe 76 serving also as the handle provided on the side of one end in the longitudinal direction of the core shaft 74. And, an arm 77 extending in the direction of axis shaft line of the core shafts 74, 75 is pivoted on a midway between both supporting members 72, 73 in the longitudinal direction so as to be swingable around a supporting shaft 78 meeting at right angles with said axis shaft lines of the core shafts 74, 75, a midway portion of a third supporting member 80 provided with saw-toothed third supporting pieces (f) on both sides in the longitudinal direction being pivotally connected with the vicinity of a portion, where said arm 77 is pivoted, through a pivoting shaft 79 parallel to said supporting shaft 78, and energizing means 81 for energizedly pressing said third supporting pieces (f) against the inner circumferential surface S of the core cylinder 71 being provided between the second supporting member 73 and the arm 77. On the other hand, the first supporting piece (d) of the first supporting member 72 being bent at a first contact portion (i) against the inner circumferential surface S of the core cylinder to form a first extending portion 83 extending toward the side of a second contact portion (j) of said second supporting piece (e) against the inner circumferential surface S, the second supporting piece (e) of the second supporting member 73 being bent at said second contact portion (j) against the inner circumferential surface S to form a second extending portion 84 extending toward the side of said first contact portion (i) of said first supporting piece (d) against the inner circumferential surface S of the core cylinder. In addition, an arm-pivoting member 85 is bently connected with the first and second supporting members 72, 73 at a bending angle of for example 120° and a nearly half portion in the longitudinal direction of said arm-pivoting member 85 is removed. That is to say, although the first arid second extending portions 83, 84 of the first and second supporting members 72, 73 are bent at the extending ends thereof to engage the extending bent ends with each other and the first and second supporting member 72, 73 is provided with the first and second regulating piece 86, 87, respectively, in the roll paper-supporting shaft 24 shown in Fig. 1, the extending portions 83, 84 are reduced in extending length and the first and second regulating pieces 86, 87 are omitted in the roll paper-supporting shaft 24 shown in Fig. 13. [Effects of the Invention] The present invention has the above described construction, so that the following effects are exhibited. That is to say, according to a first embodiment, the core shafts fixedly mounting the first and second supporting members thereon are small-sized, so that not only the roll paper-supporting shaft can be reduced in weight and improved in assembly but also the cost of production can be reduced. According to a second embodiment, the core cylinder is supported not only by the first and second supporting members touching internally the inner circumferential surface thereof but also at the separate two places on both sides at least in the longitudinal direction of the third supporting member, so that both sides of the roll paper can be prevented from swinging in the radial direction and thus the roll paper can be ideally supplied in the appointed manner without accompanying the poor paper-supply such as oblique paper-supply.

Claims: A construction of a supporting shaft (24) of a roll paper (3), in which said roll paper is supported by means of first to third supporting pieces (d, e, f) touching internally an inner circumferential surface (S) of a core cylinder of the roll paper at three points as seen in a longitudinal direction of said core cylinder, characterized in that a first supporting member (72) provided with said first supporting piece (d) and a second supporting member (73) provided with said second supporting piece (e) are fixed in opposition to each other by means of a core shaft or two small-sized core shaft portions (74, 75) axially provided in a longitudinal direction of said first and second supporting members (72, 73). A construction of a supporting shaft of a roll paper as set forth in claim 1, wherein the first supporting member (72) and the second supporting member (73) have the same one shape. A construction of a supporting shaft of a roll paper as set forth in one of the claims 1 or 2, wherein the first supporting piece (d) of the first supporting member (72) is bent at a first contact portion (i) against said inner circumferential surface (S) of the core cylinder to form a first extending portion (3) extending toward the side of a second contact portion (j) of the second supporting piece (e) against the inner circumferential surface (S) of the core cylinder, the second supporting piece (e) of the second supporting member (73) being bent at said second contact portion (j) against the inner circumferential surface (S) to form a second extending portion (84) extending toward the side of said first contact portion (i) of the first supporting piece (d) against the inner circumferential surface (S) of the core cylinder, and extending ends of said first extending portion (83) and second extending portion (84) being engaged with each other. A construction of a supporting shaft of a roll paper as set forth in claim 1 or 2, wherein a third supporting member (80) provided with said third supporting piece (f-f) is pivoted on an arm (77), an arm-pivoting member (85) being bently connected with the first and second supporting members (72, 73), a first regulating piece (86) extending toward the side of said arm-pivoting member (85) of the second supporting member (73) under the condition that it is fixed by the core shaft being bently connected with the first supporting member (72), and a second regulating piece (84) extending toward the side of the arm-pivoting member (85) of the first supporting member (72) under the condition that it is fixed by the core shaft (74, 75) being bently connected with the second supporting member (73). A construction of a supporting shaft of a roll paper as set forth in claim 4, wherein said first and second regulating pieces (86, 87) are engaged with the core shaft. A construction of a supporting shaft of a roll paper as set forth in claim 1, wherein an arm (77) extending in the direction of axis shaft line of the two small sized core shaft portions (74, 75) is pivoted on midway in the longitudinal direction between the first supporting member (72) and the second supporting member (73) so as to be swingable around a supporting shaft (78) meeting at right angles with said axis shaft lines of the two core shaft portions (74, 75), a midway portion of a third supporting member (80) provided with said third supporting pieces (f-f) on both sides at least in longitudinal direction being pivoted on said arm (77) through a pivoting shaft (79) parallel to said supporting shaft (78), and energizing means (81) for energizedly pressing the third supporting pieces (f-f) against said inner circumferential surface (S) of the core cylinder being provided. A construction of a supporting shaft of a roll paper as set forth in claim 6 , wherein the arm (77) is manually swung against said energizing means (81). A construction of a supporting shaft of a roll paper in accordance with claim 1 , characterized in that said arm-pivoting member (85) of said first supporting member (72) and'said arm-pivoting member (85) of said second supporting member (73) are respectively provided with said third supporting pieces (f-f). A construction of a supporting shaft of a roll paper as set forth in claim 8, wherein a first regulating member extending toward the side of the third supporting piece of the second supporting member is bently connected with the first supporting member under the condition that it is fixed by means of said core shaft and a second regulating piece extending toward the side of the third supporting piece of the first supporting member is bently connected with the second supporting member under the condition that it is fixed by means of the core shafts. A construction of a supporting shaft of a roll paper according to claim 1, wherein the core shaft (74) fixedly mounting the first and second supporting members (72, 73) thereon is a single shaft extending all over the length in the longitudinal direction of the first and second supporting members (72, 73), and end portions of the core shaft (74) are projected from end portions of the first and second supporting members (72, 73). A construction of a supporting shaft of a roll paper, in accordance with claim 10, wherein a first supporting member (72) provided with said first supporting piece (d) brought into contact with said inner circumferential surface (S) of said core cylinder in a longitudinal direction and a second supporting member (73) provided with said second supporting piece (e) brought into contact with the inner circumferential surface (S) of the core cylinder in a longitudinal direction are fixedly mounted on said single core shaft (74) in opposition to each other, an arm (77) extending in the direction of axis shaft line of the core shaft (74) being pivoted in a midway in the longitudinal direction between the first supporting member (72) and the second supporting member (73) so as to be swingable around a supporting shaft (78) meeting at right angles with said axis shaft line of the core shaft (74), a midway portion of a third supporting member (80) provided with said third supporting pieces (f-f) on both sides at least in the longitudinal direction being pivoted on said arm (77) through a pivoting shaft (79) parallel to said supporting shaft (78), and energizing means (81) for energizedly pressing the third supporting pieces (f-f) against the inner circumferential surface (s) of the core cylinder being provided. A construction of a supporting shaft of a roll paper as set forth in claim 10, wherein the core shaft (74) is provided with a swing-regulating member (82) for regulating a swinging range of the arm and said energizing means (81) is provided between the core shaft (74) and the arm (77). A construction of a supporting shaft of a roll paper as set forth in claim 10, wherein the third supporting piece (f-f) has a saw-toothed shape. A construction of a supporting shaft of a roll paper as set forth in claim 10, wherein the first supporting member (72) and the second supporting member (73) have the same one shape. A construction of a supporting shaft of a roll paper as set forth in claim 14, wherein the first supporting piece (d) of the first supporting member (72) is bent at a first contact portion (i) against said inner circumferential surface (S) of the core cylinder to form a first extending portion (83) extending toward the side of a second contact portion (j) of the second supporting (73) against the inner circumferential surface (S) of the core cylinder, the second supporting piece (e) of the second supporting member (73) being bent at said second contact portion (j) against the inner circumferential surface (S) to form a second extending portion (84) extending toward the side of said first contact portion (i) of the first supporting piece (d) against the inner circumferential surface (S) of the core cylinder, and extending ends of said first extending portion (83) and second extending portion (84) being engaged with each other. A construction of a supporting shaft of a roll paper set forth in claim 14 , wherein a first regulating piece (86) extends toward the side of said arm-pivoting member of the second supporting member under the condition that it is fixed by the core shaft (74) being bently connected with the first supporting member (74), and a second regulating piece (87) extends toward the side of the arm-pivoting member of the first supporting member under the condition that it is fixed by the core shaft (74) being bently connected with the second supporting member (73). A construction of a supporting shaft of a roll paper as set forth in claim 16, wherein the arm-pivoting member of the first supporting member and said first regulating piece are formed in a ratio of about 1:1 in a longitudinal direction of the first supporting member and the arm-pivoting member of the second supporting member and said second regulating piece are formed in a ratio of about 1:1 in a longitudinal direction of the second supporting member. A construction of a supporting shaft of a roll paper as set forth in claim 10, wherein the arm is manually swung against said energizing means.

Inventors: IZUMI KOJI, KAJITA HIROSHI, MATSUO TAKESHI, TAKEMOTO MITSUTOSHI, IZUMI, KOJI, KAJITA, HIROSHI, MATSUO, TAKESHI, TAKEMOTO, MITSUTOSHI
Applicants: MITA INDUSTRIAL CO LTD, MITA INDUSTRIAL CO., LTD.
Application year: 1991
Main classification: G03G15
IPC codes: G03G15, B65H16