JP2686475B2 - Paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, a printing machine, a copying machine, and various other processing apparatus bodies, each of which is preliminarily stacked and stored, and each of plastic and other sheets of paper. The present invention relates to a sheet feeding device that is supplied separately. 2. Description of the Related Art Generally, as a method for separating and feeding sheets stacked and stored one by one from the uppermost portion, the uppermost sheet on a stacker is fed out by a sheet feeding rotary member engaging with the sheet and is fed. There is known a so-called gap separation method in which a sheet is separated and fed at a sheet feeding gap for one sheet prepared on the downstream side. However, in this gap separation system, when the sheet feeding gap is formed by the sheet feeding rotating member and the sheet leading edge locking member, as shown in FIG. If the stop member is provided outside the shaft end side surfaces of the pair of paper feed rotating bodies, the leading end locking member is less likely to contact the paper when the paper is curled upward in the direction perpendicular to the paper feed direction. Become. In view of the above problems, it is an object of the present invention to provide a paper feeding device capable of reliably and stably feeding a paper without being affected by curling of the paper. [0005] Since SUMMARY OF THE INVENTION The present invention to achieve the above object, the mounting et Rutotomoni the rotary shaft driven by a driving means, a pair of selecting functions by the width of the paper (2
Individual) sheet feeding rotators, a sheet pedestal disposed below the sheet feeding rotators, supporting a sheet fed by the sheet feeding rotator, and pressing the sheet to the sheet feeding rotator. The pair of paper feed rotors face each other .
Is arranged so as to support the front end of the paper on the paper tray, forms a paper feed gap with the paper feed rotator, and feeds the paper supplied to the paper feed gap by the paper feed rotator. It is characterized in that it is provided with two sheet leading end locking members that cooperate with the sheet rotator and separate them into one sheet. If the leading end locking member is provided outside the shaft end side surfaces of the pair of sheet feeding rotary members, the leading end locking member contacts the paper when the paper is curled upward. It gets harder. On the other hand, like the paper feeding device of the present invention, a pair of (two) paper feeding units that function selectively according to the width of the paper.
If the two paper-sheet leading end locking members are provided so as to face the respective paper-feeding rotary bodies of the rolling body , the paper may be curled downward or upward in the width direction. Also, since the lower surface of the paper is supported by the paper table and the upper surface of the paper is pressed by the pair of paper feed rotating bodies, the curl of the paper between the pair of paper feed rotating bodies is corrected, and the leading end locking member and the paper The contact with is stable, and stable separation can be performed regardless of the curl direction of the paper. An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a sheet feeding device of the present invention. In the drawing, the sheet feeding device B is detachably attached to the processing device (printing machine) A constituted by a printer, and the sheets are separately supplied to the sheet feeding port of the processing device A one by one. The printer is an ordinary thermal transfer printer, and the platen 1 for backing up the paper in the printing section P is used.
A printing element 2; a carriage 3 which mounts the printing element 2 and moves stepwise at character intervals; and a platen 1.
The platen paper feeding mechanism 4 for stepwise feeding the paper at the position of 1 and the drive motor M of this paper feeding mechanism, and the printing element 2 in accordance with the printing signal output from the computer or the input key. Printing is performed on paper, and the carriage 3 is moved stepwise according to the character spacing to execute the next printing. When printing for 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 is a casing in which a platen 1 is fixedly supported on an internal frame 6. The platen 1 is composed of a shaft-shaped stem member positioned in the width direction of the sheet, and the surface facing the sheet is formed of an elastic material such as rubber. A U-shaped paper path 7 is formed around the platen 1, and paper is taken in from a paper feed port 7a at one end of the platen 1 and printed at the platen 1 site, and then discharged from a paper ejection port 7b at the other end. It is designed to be discharged. And paper path 7
At the same time as feeding the paper to the platen 1 part, a paper feeding mechanism for stepwise feeding the paper at the platen 1 part is prepared as follows. Since the platen 1 shown in the figure has a structure that does not have a paper feed function, a paper feed roller 8 is rotatably supported by the frame 6 adjacent to the platen 1 separately from the platen 1, and the paper feed roller 8 Has one end connected to the drive motor M by a gear transmission mechanism 9 and the other end provided with a knob 10 for manual rotation shown in FIG. A paper guide 11 is arranged opposite to the paper feed roller 8 with the paper path 7 interposed therebetween, and pinch rollers 12 and 13 are also arranged. This pinch roller 1
Two rows 2 and 13 are arranged near the paper feed port 7a and near the platen 1, and the leaf spring holder 14 is used to constantly feed the paper feed roller 8
It is fixed to the frame 6 with screws 15 so as to be pressed against the side. The carriage 3 is movable left and right in the paper width direction, and its rear end 3a is a guide rail 16 of the frame 6.
The tip ends 3b are fitted to the shafts 17 attached to the frame. Although not shown, a stepping motor is fixed to one of the pulleys at the left and right ends of the platen 1 as usual, and is fixed to the endless wires. 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. Illustration 2
Reference numeral 0 denotes a paper sensor arranged in the paper feed path 7, which detects the trailing edge of the paper during printing, determines the last line of printing and stops the printing operation, and at the same time rotates the paper feed roller 8 by a predetermined amount to move the paper. It is discharged from the discharge port 7b. In the printer shown in the figure, the paper feed mechanism 4 is constituted by the paper feed roller 8 arranged in the vicinity of the fixed platen 1, but the platen itself is constituted by a rotatable roller member regardless of this. After pressing the pinch roller, a drive motor may be connected to the roller platen to feed the paper by rotating the platen. Therefore, the paper feeding device B of the present invention automatically feeds the paper from the paper ejection port 7b to the frame 6 of the printing machine A together with the paper ejection device which guides the paper to the paper ejection stacker 23 for stacking and storage. Is configured as. The paper feeding / discharging unit B is provided with a paper feeding stacker 22 and a paper discharging stacker 23 on the apparatus frame 21 at positions connected to the paper feeding port 7a and the paper discharging port 7b of the printer main body A, and the frame of the printer A is provided. It is designed to be detachably attached to 6. Therefore, the paper discharge device is the paper discharge port 7b of the printer A.
The paper discharge roller 25 arranged in the vicinity and the paper discharge roller 2
5 is composed of an openable / closable discharge guide 26 that guides the sheet to the discharge stacker 23, and a discharge stacker 23. In particular, the discharge stacker 23 has a sheet rear end receiving portion 23a,
The back side receiving portion 23b and a manual insertion slit 27 for inserting a sheet through the gap between the both receiving portions are shown. This manual feed slit 27 is a path 28 prepared so that the manual feed paper can be fed to the pressure contact point between the paper feed roller 8 and the pinch roller 12 of the paper feed port 7a of the printer body A.
It is connected to. A discharge path 29 extending from the discharge port 7b of the printer body A to the discharge stacker 23 is formed between the discharge roller 25 and the discharge guide 26, and the discharge roller 25 is the platen described above. The paper is ejected at the same speed as the paper conveyance speed of the paper feed mechanism 4. Next, the sheet feeding device will be described. The sheet feeding device includes a sheet feeding stacker 22 and the sheet feeding stacker 22.
The paper feed roller (paper feed rotator) 30 that engages with the top paper of the papers stacked and stored in the paper, and the paper fed out by the paper feed roller 30 is used as the pressure contact between the paper feed roller 8 and the pinch roller 12. It is composed of a paper feed path 31 for guiding. These are attached to the machine frame 21 as shown in FIGS. The device frame 21 includes a pair of left and right side plates 32,
The left and right side plates 32 and 33 are composed of a rotary shaft 30a of the paper feed roller 30, a rotary shaft 35 of the paper discharge roller 25, and transmission gears 36 and 37 thereof. , 38, 39, 40, chucking members 41, 42 for the printing machine A are attached, and the paper feed stacker 22 is installed on the bottom plate 34 at the same time as the bottom plate 34.
The leading end 34a of the sheet feeding path 31 constitutes a sheet feeding path 31 for guiding the sheet fed by the sheet feeding roller 30 to the sheet feeding port 7a. A rotary shaft 30a attached to the left and right side plates 32, 33 is equipped with a paper feed roller 30, and like the rotary shaft 35 of the paper discharge roller 25, the gear 3 is provided.
6, 38, 39, 40 are connected to the drive motor M on the printing machine A side so that the paper feed roller 30, the platen paper feed roller 8 and the paper discharge roller 25 are integrally rotated at the same timing. ing. That is, the drive motor M built in the printing machine A
Power is transmitted from the output shaft 41 to the rotary shaft 8a of the platen paper feed roller 8 by gear transmission. The gear 36 on the side of the sheet feeding device meshes with the gear 42 in the gear transmission system, the rotation shaft 35 of the paper discharge roller 25 is driven by the gear 36 to the gear 37, and the gear 36 also feeds the gears 38, 39, 40. Paper roller 3
The rotating shaft 30a of 0 rotates. The paper feed rollers 30 are separated by two in the width direction.
Composed of one or more rollers. The illustrated one is composed of three pieces, and this is for allowing various papers having different paper thicknesses and paper widths to be described later to be fed by exchanging the paper feed stacker 22. 3 sheets
Paper width and paper feed roller 30 so that paper with a small width such as postcards is fed by two rollers.
The positional relationship with is selected. A space 43 for mounting 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 to the front end in the paper feed direction. A leaf spring guide 44 that faces directly below the sheet feeding roller 30 is attached. The leaf spring guide 44 has a spring action for urging the sheet feeding stacker 22 mounted in the mounting space 43 toward the sheet feeding roller 30, and at the same time when the stacker is inserted into the space 43. It is composed of an inclined plate-shaped member that also serves as a guide. According to the present invention, the paper feed stacker 22 is composed of two or more paper feed cassettes (paper mounting bases) for respectively accommodating papers having different width sizes and other types. The first cassette body 22A is provided on both left and right sides of the paper storage frame 45 shown in FIGS. 1 and 2 with separation claws 46, 46 which engage with the top edge of the top paper of the paper stored therein.
b, and the second cassette body 22B has a third
4 and FIG. 4, the front end portion of the paper storage frame 47 is provided with front end locking members 48a and 48b that prevent the passage of two sheets of paper between the paper feed roller 30 and form a paper feed gap. It is attached to the mounting space 43 of the machine frame 21. The tip locking members 48a and 48b are a pair of paper feed rollers.
So as to face each roller of 30 (paper feed rotator)
It is located in. That is, the two tip locking members
48a and 48b are those of the two paper feed rollers 30 and 30.
Inside each side of the shaft end side, with a predetermined interval
Formed, preferably as shown in FIG.
It is arranged so as to face the rolling element (roller). The first cassette body 22A has a paper storage frame 45.
Left and right side plates 45a, 45b and a bottom plate 45 formed by resin
The left and right side plates 45a and 45b are supported by the pin 49 at the rear end portion of the arm lever 50 having the separation claws 46a and 46b at the tips thereof, and the separation claws 46a and 46b swing up and down. It is installed so that In the first cassette body 22A, the idle roller 52a,
52b is embedded so as to reduce the load when the paper feed roller 30 rotates when the paper on the cassette body 22A runs out. Along with this, the first cassette body 22A has a projection 53 that hangs down from the bottom, and this projection 53 is a guide groove 54 formed in the bottom plate 34 of the apparatus frame 21.
When the cassette body 22A is inserted and set in the mounting space 43, the guide groove 54 positions the left and right directions. Further, the first cassette 22A and the apparatus frame 21 are fitted with the latching projections 55 formed on one side thereof and the latching holes 56 formed on the other side, and are retained in the state shown in FIG. ing. That is, the first
In the state shown in the figure, the rear end of the first cassette body 22A is coupled by the latching projection 55 and the latching hole 56, and the tip end portion can be swung around this coupling portion, and the leaf spring guide 4 described above is used.
At 4, the sheet is biased toward the sheet feeding roller 30. Next, in the second cassette body 22B, the paper storage frame 47 is formed of a molded body of left and right side plates 47a and 47b and a bottom plate 47c, and the paper mounting table 57 is vertically movable inside the storage frame 47. It is arranged. That is, the rear end portion of the paper tray 57 is supported by the bottom plate 47c of the storage frame 47 by the pin 58, and the front end portion is supported so as to be vertically movable around the pin 58,
A spring 59 arranged between the storage frame 47 and the bottom plate 47c.
Therefore, the paper table 57 is biased toward the paper feed roller 30. The second cassette body 22B shown in the drawing has a slide side plate 60 whose width direction can be adjusted on one of the left and right side plates 47a and 47b of the storage frame 47 so that cards such as postcards can be stored in a horizontal position or a vertical position. It is installed as. That is, the width dimensions of the left and right side plates 47a and 47b are set in accordance with the size in the horizontal posture, and the slide side plate 60 has the bent piece 61 and the guide groove 62 of the bottom plate 47c.
The slide side plate 60 is moved to the right side in FIG. 4 to hold the paper in the vertical position. In the second cassette body 22B, the first cassette
As in the case of the cassette body 22A, a projection 53 hanging from the bottom plate 47c is formed, and the guide groove 5 of the apparatus machine frame 21 is formed.
4 is adapted to be fitted in and mounted on the base plate 4, and at the same time, a hooking protrusion 55 is provided. A positioning piece having a U-shaped groove 63 extending from the left and right side plates 47a and 47b of the second cassette body 22B is fitted to the rotary shaft 30a of the paper feed roller 30 to form the paper feed roller 30. Positional relationship with the cassette body 22B,
In particular, the paper feed gap between the paper feed roller 30 and the front end locking members 48a and 48b is kept constant. The leading end locking members 48a and 48b are formed integrally with the storage frame 47, and lock the leading end of the sheet on the sheet loading table 57 and at the same time, feed the uppermost one sheet to the sheet feeding roller 30.
A sheet feeding gap is formed between the roller 30 and the roller 30 so as to feed the sheet in cooperation with the sheet feeding roller. Further, the positions of the first cassette body 22A and the second cassette body 22B with respect to the paper feed roller 30 are set to the storage paper front end of the first cassette body 22A shown in FIG.
The distance from the point where the sheet feeding roller 30 contacts the sheet (the point where the sheet feeding force is applied) is set to be larger than that of the second cassette body 22B shown in FIG. In the illustrated example, each of the cassette bodies 22A and 22B is provided with a hook hole 5 of the apparatus frame 21.
Since the latch projections 55 and 6'are engaged and attached to each other, the length from the position of the latch projection 55 to the leading end of the paper storage frame (actually, the leading end of the stored paper) is the first. The cassette body 22A side is set to be larger than the second cassette body 22B side. If the front end locking member is provided outside the shaft end side surfaces of the pair of paper feed rollers, the front end locking member contacts the paper when the paper is curled upward. Hard to do. On the other hand, as in the paper feeding device of the present invention, the pair of paper feeding rollers are opposed to the respective paper feeding rotary members.
If a pair of paper leading end locking members are provided as described above, the lower surface of the paper is supported by the paper loading table and the upper surface of the paper is supported by the pair of papers regardless of whether the paper curls downward or upward in the width direction. Since it is being pressed by the paper feed roller of
The curl of the paper between the pair of paper feed rollers is corrected, the contact between the leading end locking member and the paper is stabilized, and stable separation can be performed regardless of the curl direction of the paper.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a paper feeding device of the present invention. FIG. 2 is a top view thereof. FIG. 3 is an enlarged cross-sectional view thereof. FIG. 4 is a top view of a cassette body 22A. FIG. 5 is a schematic diagram of a drive system. FIG. 6 is an enlarged view of a paper table. FIG. 7 is a plan view thereof. FIG. 8 is an explanatory diagram of a curled state of paper. [Explanation of symbols] 1 platen 2 printing element 3 carriage 4 platen paper feed mechanism 5 casing 6 frame 7 paper path 7a paper feed port 7b paper ejection 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 shaft 20 paper sensor 21 device machine frame 22 cassette body 22A first cassette body 22B second cassette body 23 paper ejection stacker 23a paper rear end receiving portion 23b rear surface receiving portion 25 ejection Paper roller 26 Paper discharge guide 27 Manual insertion slit 28, 31 Paper feed path 29 Paper discharge path 30 Paper feed rollers 32, 33 Side plates 34, 45c, 47c Bottom plate 34a Bottom plate tip 35 Rotation shafts 36, 37, 38, 39, 40 Transmission gears 41, 42 chucking member 43 stacker mounting space 44 leaf spring guide 45 47 Paper Storage Frames 45a, 45b, 47a, 47b Left Right Side Plates 46a, 46b Separation Claws 48a, 48b Paper Tip Stopping Member 49 Pins 50 Arm Lever 52a, 52b Idle Roller 53 Projection 54, 62 Guide Groove 55 Locking Protrusion 56 Locking Mouth 57 Paper loading platform 57a Paper loading platform tip 58 Pin 59 Spring 60 Sliding side plate 61 Bending piece 63 U-shaped groove A Processing device (printing machine) B Paper feeding device M Drive motor P Printing unit

Claims (1)

(57) [Claims] Mounted on a rotating shaft driven by drive means
In addition, a pair of (two) sheet feeding rotary members that selectively function according to the width of the sheet, and a sheet disposed below the sheet feeding rotary member and supporting the sheet fed by the sheet feeding rotary member, the sheet is described above. A paper table that is in pressure contact with the paper feed rotator and a paper feed rotator of the pair of paper feed rotators are arranged so as to support the leading edge of the paper on the paper pedestal and to rotate the paper feed. A paper feed gap is formed between the paper feed member and the paper feed rotary member, and the paper fed into the paper feed gap is separated into one sheet by cooperation with the paper feed rotary member. A sheet feeding device comprising: a member.