JP2519877C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a sheet of paper, plastic, or the like previously loaded and stored in a printer, a printing machine, a copying machine, or any other processing apparatus is preliminarily stored. The present invention relates to a sheet feeding device that feeds sheets one by one. 2. Description of the Related Art Generally, as a method of feeding stacked paper, plastics, and other papers one by one from a top sheet one by one, a sheet feeding rotating body (hereinafter, referred to as a sheet rotating body) that engages the top sheet on a stacker is provided.
It is called a paper feed roller. ) And at the same time, the sheet which is separated and fed at a gap of one sheet prepared downstream of the sheet feeding is used as a simple sheet feeding mechanism for relatively thick sheets such as postcards and other cards. [0003] However, in this type of separation method, if the direction in which the stacked sheets are fed out is not constant, the leading edge of the sheet reaching the sheet feeding gap provided downstream of the sheet feeding roller is not used. In this case, the stacker is moved up and down in a state where the leading ends are parallel, so that the next sheet is advanced as the sheet is supplied. In this case, if the paper is curled or the paper is too stiff, the paper does not reliably engage with the paper feed roller, and even if the paper feed roller is rotated, it often slips and does not reliably feed the paper. In particular, when printing is performed on a relatively thick sheet of paper such as a postcard by a printing device, and then the stacking is performed on a stacker of a paper feeding device in order to print on the back surface again, and these are sequentially separated and supplied,
The paper has already been curled, and if the amount of loaded paper is large, it slips between the paper feed rollers and causes non-feeding. If so, there is a possibility that a so-called double feed in which several sheets are fed simultaneously when the stacking amount of sheets is reduced may be caused. In view of the above, an object of the present invention is to provide a sheet feeding apparatus capable of preventing a non-feed or a double feed and obtaining a stable and reliable separation and feeding. That is, in order to achieve the above object, the present invention provides a paper feed roller which is driven by a driving means and feeds out a paper sheet which comes into contact with a peripheral surface; In addition to supporting the paper, the length in the paper feeding direction is shorter than the length of the paper to be supported in the paper feeding direction, and the leading edge is located forward of the contact point between the paper feed roller and the paper in the paper feeding direction. The paper feed table is supported on the rear side in the paper feeding direction so that the leading edge moves toward the contact point of the paper feed roller, and the paper loading table presses the paper against the paper feeding roller. A first support surface for locking, and a second inclined surface in a paper feeding direction for guiding the leading end of the paper locked in the first support surface in the paper feeding direction with the rotation of the paper table to the paper feeding roller. And a leading end of the sheet accommodated in the sheet table having The paper feed roller is locked at a position forward of the contact point between the paper feed roller and the paper in the paper feed direction, and a paper feed gap is formed between the paper feed roller and the paper feed roller. A configuration provided with a leading end locking member that separates the sheet into one sheet in cooperation with the paper feed roller is a solution to the problem. [0008] Since the present invention is configured as described above, when the paper loading table is pushed down as shown in FIG. (B), the leading edge of the paper set on the paper table moves in the direction away from the leading edge locking member, and the paper is moved between the leading edge and the leading edge locking member. A gap α is generated. For this reason, even when the leading end of the sheet is strongly pressed against the first support surface of the leading end locking member when the sheet is set, the pressure contact force is reduced and the frictional resistance is reduced, so that the leading end of the sheet follows the first support surface. When the paper is fed out and the paper is fed out, the leading end locking member is inclined before the paper is separated into one sheet between the paper feeding roller and the leading end locking member as shown in FIG. Since separation is performed in advance on the second support surface, non-feed and double feed can be prevented more easily. An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a sheet feeding apparatus according to the present invention. In the drawing, a paper feeding device B is detachably attached to a processing device (printing machine) A composed of a printer, and sheets are separately supplied to a paper feeding port of the printing machine A one by one. The printer is a normal thermal transfer printer, and includes a platen 1 for backing up a sheet in a printing section P, a printing element 2, a carriage 3 on which the printing element 2 is mounted and which moves step by step at every character interval. The printing element 2 includes a platen paper feed mechanism 4 for stepwise feeding the paper at the position of the platen 1 in the row direction, and a drive motor M for the paper feed mechanism, and a print element 2 according to a print signal output from a computer or an input key. To print on the paper, and move the carriage 3 stepwise according to the character interval to execute the next printing. When printing of one line is completed, the paper feed mechanism 4 is operated to step-feed the sheet to the next line. In FIG. 1, reference numeral 5 denotes a casing in which a platen 1 is fixedly supported on an inner frame 6. The platen 1 is formed of an axial stem material positioned in the width direction of the paper, and the surface facing the paper is formed of an elastic material such as rubber. A paper path 7 having a U-shape is formed around the platen 1. Paper is taken in from a paper feed port 7 a at one end and printed at a portion of the platen 1, and then a paper discharge port 7 b at the other end.
It is designed to be discharged from. In the paper path 7, a paper feed mechanism that supplies paper to the platen 1 site and feeds the paper stepwise at the platen 1 site is prepared as follows. Since the platen 1 has a structure in which the platen 1 does not have a paper feed function, a paper feed roller 8 is rotatably supported on the frame 6 separately from the platen 1 and adjacent to the platen 1. One end of the feed roller 8 is connected to the drive motor M by a gear transmission mechanism 9, and the other end is provided with a knob 10 for manual rotation shown in FIG. The paper feed roller 8 has a paper guide 11 disposed opposite to the paper path 7 and pinch rollers 12 and 13. This pinch roller 12, 1
Numerals 3 are arranged in two rows near the paper feed port 7a and near the platen 1.
4, the screw 15 is fixed to the frame 6 so as to be constantly pressed against the paper feed roller 8 side. The carriage 3 has a trailing end 3 a fitted to a guide rail 16 of the frame 6 and a leading end 3 b fitted to a shaft 17 attached to the frame 6 so as to be movable left and right in the paper width direction. Although not shown, a stepping motor is connected to one of the pulleys at the same time as is fixed to an endless wire bridged over pulleys at the left and right ends of the platen 1 as usual. Therefore, a print element 2 composed of a thermal head is mounted on the carriage 3 so as to be swingable by a shaft 19 so as to abut on the platen 1 during printing and to be separated when not printing, and is connected to a print control circuit by flexible wiring. I have. Further, a ribbon tape is mounted on the carriage 3, and the tape is wound up in response to the movement of the carriage 3 in the printing direction. In FIG. 20, a paper sensor disposed in the paper feed path 7 detects the trailing edge of the paper during printing, determines the last line of printing, stops the printing operation, and simultaneously rotates the paper feed roller 8 by a predetermined amount to rotate the paper. Is discharged from the discharge port 7b. In the illustrated printer, the paper feed mechanism 4 is constituted by a paper feed roller 8 arranged near a fixed platen, but the platen itself is constituted by a rotatable roller-like member regardless of this, and a pinch is provided. After the rollers are pressed against each other, a driving motor may be connected to the roller-shaped platen to feed the paper by rotation of the platen. Therefore, the paper feeder B of the present invention automatically feeds paper to the frame 6 of the printing machine A together with a paper discharge device that guides the paper from the paper discharge port 7 b to the paper discharge stacker 23 and stores the paper. It is constituted as. The paper feeding / discharging unit B includes a paper feeding stacker 22 and a paper discharging stacker 23 in a device machine frame 21 at positions continuous with the paper feeding port 7a and the paper discharging port 7b of the printing machine A. It is designed to be removably attached to. Therefore, the paper discharge device includes a paper discharge roller 25 arranged near the paper discharge port 7 b of the printing machine A, and a freely openable and closable paper discharge that guides the sheet to the paper discharge stacker 23 facing the paper discharge roller 25. The discharge stacker 23 includes a guide 26 and a paper discharge stacker 23. In particular, the paper discharge stacker 23 includes a sheet rear end receiving portion 23a, a back surface receiving portion 23b, and a manual insertion slit 27 for inserting a sheet from the illustrated gap between the both receiving portions. It is composed. The manual feed slit 27 is connected to a path 28 prepared so that a manual feed paper can be supplied to a pressure contact between the paper feed roller 8 and the pinch roller 12 of the paper feed port 7 a of the printing machine A. A paper discharge path 29 from the paper discharge port 7b of the printing machine A to the paper discharge stacker 23 is formed between the paper discharge roller 25 and the paper discharge guide 26, and the paper discharge roller 25 is provided with the above-described platen paper. The paper is discharged at the same speed as the paper transport speed of the feed mechanism 4. Next, the sheet feeding device B will be described. The sheet feeding device B includes a sheet feeding stacker 22 and a sheet feeding roller 30 that engages with the uppermost sheet of the sheets stacked and stored in the sheet feeding stacker 22.
And a paper feed path 31 for guiding the paper fed by the paper feed roller 30 to the pressure contact between the paper feed roller 8 and the pinch roller 12. These are mounted on an apparatus frame 21 as shown in FIGS. The machine frame 21 is composed of a pair of left and right side plates 32 and 33 and a bottom plate 34 connecting the both side plates. The rotating shaft 35 of the discharge roller 25 and its transmission gears 36, 37, 38, 3
9, 40, the chucking members 41, 42 to the printing machine A are attached, and the sheet feeding stacker 22 is installed on the bottom plate 34, and at the same time, the tip 34a of the bottom plate 34 A paper feed path 31 leading to the paper feed port 7a is configured. The rotation shaft 30 a attached to the left and right side plates 32, 33 is provided with a paper feed roller 30, and the gears 36, 38, 38, similarly to the rotation shaft of the discharge roller 25 described above.
The drive motor M on the printing machine A side is connected by 39 and 40, and the three members of the paper feed roller 30, the platen paper feed roller 8, and the paper discharge roller 25 are integrally rotated at the same timing. That is, power is transmitted from the output shaft 41 of the drive motor M incorporated in the printing machine A to the rotating shaft 8 a of the platen paper feed roller 8 by gear transmission. Gear 4 in this gear transmission system
The gear 36 on the paper feeder side meshes with the gear 2, the rotation shaft 35 of the paper discharge roller 25 is driven by the gear 36 from the gear 36, and the rotation shaft 30 a of the paper feed roller 30 by the gears 38, 39, 40 from the gear 36. Is designed to rotate. The paper feed roller 30 is composed of two or more rollers spaced apart in the width direction. The illustrated one is made up of three sheets, which are used to feed various sheets having different sheet thicknesses and sheet widths, which will be described later, by exchanging the sheet feeding stacker 22. The positional relationship between the paper width and the rollers is selected so that the paper is fed by three rollers, and the paper with a small width such as a postcard is fed by two rollers. A mounting space 43 for the paper feed stacker 22 is prepared between the paper feed roller 30 and the bottom plate 34, and the bottom plate 34 of the space 43 rises from the rear end in the paper feed direction to the front end. A leaf spring guide 44 that faces directly below the paper feed roller 30 is attached. The leaf spring guide 44 is provided with a spring action so as to urge the paper feed stacker 22 mounted in the mounting space 43 toward the paper feed roller 30, and at the same time, inserts the stacker into the space 43. It is composed of a plate-like member that is inclined so as to also serve as a guide at the time. According to the present invention, the paper feed stacker 22 is constituted by two or more paper feed cassettes that respectively store papers of different width sizes and other types. The first cassette body 22A has separation claws 46a, 46b on both left and right sides of the paper storage frame 45 shown in FIGS. 1 and 2, which are engaged with the top edge of the paper stored in the paper storage frame 45.
The second cassette body 22B has a paper feed gap at the leading end of the paper storage frame 47 shown in FIG. 3 and FIG. It is configured by providing leading end locking members 48a and 48b to be formed, and is attached to the mounting space 43 of the device machine frame 21, respectively. The first cassette body 22A is a left and right side plate 45a in which the paper storage frame 45 is integrally molded with resin.
, 45b and a bottom plate 45c. The rear end of an arm lever 50 having separation pawls 46a, 46b at its front ends is supported on the left and right side plates 45a, 45b with a pin 49, and the separation pawls 46a, 46b are It is mounted to swing up and down. In the first cassette body 22A, idle rollers 52a and 52b are buried at a portion of a bottom plate facing the paper feed roller 30, and when the paper on the cassette body 22A runs out, the paper feed roller The load when the 30 rotates is reduced. At the same time, the first cassette body 22A has a projection 53 hanging down from the bottom, and the projection 53 matches a guide groove 54 formed on the bottom plate 34 of the apparatus frame 21. When inserted and set in the mounting space 43, the guide groove 54 is positioned in the left-right direction. Further, the first cassette body 22A and the apparatus frame 21 are formed such that a hooking projection 55 formed on one of them has a hooking hole 5 formed on the other.
6, and is held in the state shown in FIG. That is, in the state shown in FIG. 1, the rear end of the first cassette body 22A is connected by the hooking projection 55 and the hooking hole 56, and the front end is swingable about this connecting portion. At 44, it is urged toward the paper feed roller 30 side. Next, in the second cassette body 22 B, the paper storage frame 47 is formed of a molded body of the left and right side plates 47 a and 47 b and the bottom plate 47 c, and the paper mounting table 57 is vertically movable inside the storage frame 47. It is arranged. In other words, the rear end of the paper mounting table 57 is supported by the pins 58 on the bottom plate 47c of the storage frame 47, and the front end is supported so as to be vertically movable about the pins 58, and is disposed between the storage frame 47 and the bottom plate 47c. The paper loading table 57 is urged toward the paper feed roller 30 by the spring 59 thus formed. As shown in FIG. 6, the length of the paper tray 57 in the paper feeding direction is shorter than the length of the supported paper in the paper feeding direction. In the illustrated second cassette body 22 B, one of the left and right side plates 47 a and 47 b of the storage frame 47 is attached to the slide side plate 6 so that cards such as postcards can be stored in a horizontal position or a vertical position.
0 is attached so that the position in the width direction can be adjusted. That is, the width dimensions of the left and right side plates 47a and 47b are set according to the size of the horizontal posture, and the slide side plate 60 is supported by fitting the bent piece 61 into the guide groove 62 of the bottom plate 47c. By moving the slide side plate 60 to the right in FIG. 4, the paper in the vertical position is held. The second cassette body 22B is formed with a projection 53 hanging from the bottom plate 47c, similarly to the first cassette body 22A, and is fitted into the guide groove 54 of the apparatus frame 21 to be mounted. At the same time, a hooking projection 55 is provided. A positioning piece having a U-shaped groove 63 extending from the left and right side plates 47 a and 47 b is fitted in the second cassette body 22 B on the rotation shaft 30 a of the paper feed roller 30, and The positional relationship with the cassette body 22B, particularly, the paper feeding gap between the paper feeding roller 30 and the front end locking member 48a is kept constant. The leading end locking member 48 a is formed integrally with the storage frame 47,
The first support surface 48c that locks the leading edge of the sheet supported by the paper feeder, and the leading edge of the sheet that is locked to the first support surface 48c with the rotation of the paper feed roller 30 of the paper loading table 57 is fed. And a second support surface 48d inclined in the sheet feeding direction for guiding the sheet in the sheet feeding direction. A paper feeding gap is formed between the rollers 30 so as to prevent the two sheets from passing. The present invention relates to the second cassette body 22 B, and it is not always necessary to make the cassette body as shown in the drawing.
2 is constituted. That is, the paper storage frame 47, the leading end locking members 48 a and 48 b formed at the leading end of the storage frame 47 and forming a paper supply gap for preventing the passage of two sheets between the paper supply rollers 30, A paper loading table 57 is provided in the frame 47, the rear end of which is supported in the paper feeding direction, and the front end of which is supported by the paper feeding roller 30 so as to be vertically movable. The leading end 57a of the sheet mounting table 57 is positioned forward of the contact Y between the sheet feeding roller 30 and the sheet in the sheet feeding state in the state of FIG. 6 The leading edge 57a of the paper table 57 and the bearing point (pin 58 in the drawing) are moved so that the leading edge 57a of the sheet platform gradually moves toward the contact Y between the paper feed roller and the paper as the state gradually decreases to the state shown in FIG. And the distance is set. As described above, the present invention is configured as described above. When the paper loading table is pushed down as shown in FIG. As shown in FIG. 2B, the leading end of the sheet set on the sheet table moves in a direction away from the leading end locking member, and a gap α is formed between the leading end of the sheet and the leading end locking member. Occurs. For this reason, even when the leading end of the sheet is strongly pressed against the first support surface of the leading end locking member when the sheet is set, the pressure contact force is reduced and the frictional resistance is reduced, so that the leading end of the sheet follows the first support surface. When the paper is fed out and the paper is fed out, the leading end locking member is inclined before the paper is separated into one sheet between the paper feeding roller and the leading end locking member as shown in FIG. Since separation is performed in advance on the second support surface, non-feed and double feed can be prevented more easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing one embodiment of a sheet feeding device of the present invention. FIG. 2 is a top view thereof. FIG. 3 is an enlarged sectional view of a main part thereof. FIG. 4 is a top view of a second cassette body 22B. FIG. 5 is a schematic diagram of a drive system. FIGS. 6A and 6B are enlarged views of a sheet mounting table, wherein FIG. 6A shows a case where the amount of stacked sheets is small, and FIG. FIG. 7 is an explanatory diagram of the effect of the present invention. (A) shows the inserted state of the sheet, (B) shows the state where the hand is released and the sheet is raised together with the sheet table, and (C) shows the state where the sheet is fed out by the sheet feeding roller. DESCRIPTION OF SYMBOLS 1 Platen 2 Print element 3 Carriage 4 Platen paper feed mechanism 5 Casing 6 Frame 7 Paper path 7a Paper feed port 7b Paper discharge port 8 Paper feed roller 9 Gear transmission mechanism 10 Knob 11 Paper guide 12, 13 Pinch roller 14 leaf spring holder 15 screw 16 guide rail 17, 19 axis 20 paper sensor 21 machine frame 22 cassette body 22A first cassette body 22B second cassette body 23 paper discharge stacker 23a paper rear end receiving part 23b back receiving part 25 discharge Paper roller 26 Discharge guide 27 Manual feed slit 28, 31 Feed path 29 Discharge path 30 Feed roller 30a, 35 Rotary shaft 32, 33 Side plate 34, 45c, 47c Bottom plate 34a Bottom plate tip 36, 37, 38, 39, 40 Transmission gears 41, 42 Chucking member 43 Star Power mounting space 44 Leaf spring guides 45, 47 Paper storage frames 45a, 45b, 47a, 47b Left and right plates 46a, 46b Separating claws 48a, 48b Paper leading edge locking member 48c First support surface 48d Second support surface 49 Pin 50 Arm Lever 52a, 52b Idler roller 53 Projection 54, 62 Guide groove 55 Hook projection 56 Hook port 57 Paper tray 57a Tip of paper tray 58 Pin 59 Spring 60 Slide side plate 61 Folded piece 63 U-shaped groove A Printing machine) B Paper feeder M Drive motor P Printing part α Air gap

Claims (1)

Claims: 1. A paper feed rotating body which is driven by a driving means and feeds out a sheet which comes into contact with a peripheral surface, supports the paper fed out by the paper feed rotating body, and has a length in a paper feeding direction. Is shorter than the length of the paper supported in the paper feed direction, and the leading edge is located forward of the contact point between the paper feed rotating body and the paper in the paper feed direction. A paper support for supporting the paper on the paper supply rotating body, and a first support for locking a leading end of the paper supported by the paper support, the paper support being supported on the rear side in the paper supply direction so as to move toward the contact point; And a second support surface inclined in the paper feeding direction for guiding the leading end of the paper locked in the first support surface in the paper feeding direction with the rotation of the paper mounting table to the paper feeding rotating body. And the leading end of the paper accommodated in the paper mounting table is located forward of the contact point between the paper supply rotating body and the paper in the paper supply direction. And a sheet feeding gap is formed between the sheet feeding rotator and the sheet fed by the sheet feeding rotator to form one sheet in cooperation with the sheet feeding rotator. A sheet feeding device comprising: a leading end locking member for separating.