JPS6360819A - Paper feeding device - Google Patents

Abstract

PURPOSE:To separately feed sheets of paper regardless of a loading quantity by forming a paper feed stacker with a paper housing frame, an engaging member on its end, and a swingably supported paper placing table, and specifying the end position of said paper placing table and the distance between said end position and a rotatably supporting point. CONSTITUTION:A paper feed stacker consists of a paper housing frame 47, an end engaging member 48 which is formed on the end part of the paper housing frame 47 and which forms a paper feeding gap for one sheet of paper toward a paper feeding rotary body 30, and a paper placing table 57 the rear end of which is rotatably supported in the paper housing frame 47 vertically movable supporting its front end part. And, the end 57a of the paper placing table 57 is positioned front ward from the point Y-Y right under the center of curvature of the paper feeding rotary body 30 when sheets of paper are loaded to the muximum, and the distance between the end 57a and a pin 58, or a shaft supporting point, is set in such a way that the end 57a is gradually moved toward the point Y-Y right under the center of curvature as the number of the sheets of paper are reduced. Thereby, the sheets of paper can be securely fed separately one at a time regardless of change in the loading quantity of the sheets of paper.

Description

[Detailed description of the invention] [Field of application of the invention]

The present invention relates to a paper feeding device that separates and feeds sheets of paper, plastic, etc., which have been pre-loaded and stored, one by one to the main bodies of various processing apparatuses such as printers, printing machines, copying machines, and others.

[Conventional technology]

Generally, as a method of separating and feeding stacked paper, plastic, etc. one sheet at a time from the top, the top paper on the stacker is fed out by a paper feed roller that engages with it, and at the same time, the paper is prepared on the downstream side of the paper feed. A mechanism that separates and feeds relatively thick paper such as postcards and other cards is used as a simple paper feeding mechanism. However, with this type of separation method, if the direction in which the stacked sheets are fed is not constant, the posture and position of the leading edge of the sheet that reaches the sheet feeding gap provided on the downstream side of the sheet feeding roller will be incorrect, resulting in paper feeding failure. - is moved up and down with its leading edge parallel, and as the paper is fed, the next paper is brought up. In this case, if the paper is curled or has a strong stiffness, it often does not engage the paper feed roller reliably, and even if the paper feed roller is rotated, it slips and the paper is not fed out reliably. In particular, after printing on comparatively thick paper such as a postcard using a printing device, if you try to stack it on the paper feeder's stunker and feed it in a square order in order to print on the back side of the paper again, the paper will already have curls. If there is a large amount of paper loaded, it will slip between the paper feed roller and cause paper feed.In an attempt to solve this problem, the paper that is strongly engaged with the paper feed roller and rotated with great force will cause the amount of paper loaded to decrease. There is a risk of causing so-called double feed in which several sheets are fed out at the same time. - Method - If the paper feed device uses a separation method other than the cap separation method in which one sheet of paper is separated as it passes through a gap equivalent to the thickness of one sheet of paper as described in L, the stacker It is known that the rear end in the paper feeding direction is supported by a support and the leading end is swingable so as to move ten degrees toward the paper feeding roller.

1.1 Object of the Invention When the present invention separates sheets fed out by a sheet feeding roller at a sheet feeding gap through which one sheet passes, this sheet feeding gap is separated between the sheet feeding roller and a sheet tip locking piece at the tip of a stacker. Based on the knowledge that the paper is formed between the sheets, the object of the present invention is to provide a paper feeding device that can perform stable and reliable separation and feeding regardless of changes in the size of the paper stacking section.

[Structure of the invention]

In order to achieve the above object, the present invention includes a paper feed rotor connected to a suitable driving means, a paper feed stacker that sequentially feeds and presses stacked sheets of paper onto the paper feed rotor, and a paper feed stacker that sequentially brings stacked sheets of paper into pressure contact with the paper feed rotor. A distal end portion 11-piece is provided at the distal end portion and forms a paper feeding gap for one sheet of paper with the paper feeding rotary body,
The above-mentioned paper feed stacker includes a paper storage frame, a leading end retaining piece W formed at the leading end of the paper storage frame, and a rear end in the paper feeding direction is supported within the paper storage frame, and the leading end is vertically swung toward the paper feeding rotating body. It consists of a movably supported paper tray, and the leading edge of this paper tray is positioned forward in the paper feeding direction from directly below the center of curvature of the paper feeding rotor when the paper is loaded at maximum, and as the paper gradually decreases. The solution is to set the distance between the leading edge of the paper mounting table and the bearing point L so that the leading edge of the paper mounting table moves directly below the center of curvature of the paper feeding rotor.

[Action of the invention] [Explanation of Examples]

The illustrated example shows a case in which a paper feeder B is detachably attached to a device A consisting of a printer, and sheets are separated and fed one by one to a paper feed port of a processing device A. The printer is a normal thermal transfer printer, and includes a platen 1 that backs up paper in the printing section P, a printing element 2, a carriage 3 that carries this printing element 2 and moves step by step at each character interval, and It consists of a platen paper feed mechanism 4 that feeds the paper at a position in steps in the row direction, and a drive device M for this paper feed mechanism. Carriage 3
is moved in steps 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. ffi 1 In the figure, 5 is a casing, and the platen 1 is fixedly supported on an internal frame 6. This platen 1 is composed of a shaft-like stem member positioned in the paper width direction, and its surface facing the paper is made of an elastic material such as rubber. A U-shaped paper path 7 is constructed around the platen 1, and the paper is taken in from the paper feed lower a at one end, printed on the platen 1, and then discharged from the paper ejection lower b at the other end. It has become. The paper path 7 is equipped with a paper feeding mechanism that feeds the paper to the platen 1 part and at the same time feeds the paper in steps at the platen 1 part as follows. In the illustrated example, since the platen 1 does not have a paper feeding function, a paper feeding roller 8 is rotatably supported on the frame 6 in addition to the platen 1 and adjacent to the platen 1. connects one end to the drive motor M and the gear transmission mechanism 9
The other end is provided with a knob 10 for manual rotation as shown in FIG. A paper guide 11 is disposed opposite to the paper feed roller 8 across the paper path 7, and a pinch roller 12.
3 is the placement. These pinch rollers 12 and 13 are arranged in two rows near the paper feed lower a and near the platen l.
The plate spring holder 14 is fixed to the frame 6 with screws 15 so as to be in constant pressure contact with the paper feed roller 8 side. The carriage 3 is movable left and right in the width direction of the paper, and its rear end 3a is fitted into a guide rail 16 of the frame 6, and its leading end 3b is fitted into a 41-digit bracket 17 attached to the frame. Although not shown in the drawings, as usual, the rack is fixed to an endless wire passed through pulleys at the left and right ends of the platen l, and at the same time a stamping motor is connected to one of the pulleys. Therefore, a printing element 2 consisting of a thermal head is swingably attached to the carriage 3 on a shaft 19 so that it comes into contact with the platen 1 during printing and separates when not printing, and is connected to the printing control circuit by flexible wiring. There is. 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. Reference numeral 20 in the figure denotes a paper sensor disposed in the paper feed path 7, which detects the trailing edge of the paper being printed, determines the last line to be printed, stops the printing operation, and at the same time rotates the paper feed roller 8 by a predetermined amount. Eject the paper from ejection lower b. In the illustrated printer, the paper feeding mechanism 4 is composed of a paper feeding roller 8 disposed near a fixed platen, but instead of this, the platen itself is composed of a rotatable roller-like member,
After the pinch roller is pressed, a drive motor may be connected to this roller-like platen to feed the paper by rotation of the platen. Therefore, the paper feeding device B of the present invention is configured as a paper feeding and discharging unit (B) that automatically supplies the paper to the frame 6 of the printing device A together with a paper discharging device that guides the paper from the paper discharging lower b to the paper discharging stacker and stacks and stores the paper. It is. This paper feed/discharge unit B is provided with a paper feed stacker 22 and a paper discharge stacker 23 in a machine frame 21 at a position connected to a paper feed lower a and a paper discharge lower b of a printing machine main body A, and a frame of the printing machine A. It is designed to be removably attached to 6. Therefore, the paper ejection device includes a paper ejection roller 25 disposed near the paper ejection 17b of the printing machine A, a paper ejection guide 26 that can be opened and closed and faces the tJII paper roller 25, and guides the sheet to the paper ejection stacker. Particularly, the paper discharge stacker 23 is composed of a paper trailing edge holder section 23a, a back holder section 23b, and both of these holders include a manual feed slit 27 for inserting the paper from the illustrated gap in the section. This manual feed slit 27 is connected to a path 28 prepared to feed manual paper to the pressure contact point between the paper feed roller 8 and the pinch roller 12 of the paper feed lower a of the printer main body A. A paper ejection path 29 from the paper ejection lower b of the printer main body A to the paper ejection stacker 23 is configured between the paper ejection roller 25 and the paper ejection guide 26.
The paper is ejected at the same speed as the paper conveyance speed of the platen paper feeding mechanism 4 described above. Next, the paper feeding device will be explained. This paper feeding device consists of a paper feeding stacker 22, a paper feeding roller 30 that engages with the topmost sheet of paper stacked and stored in this paper feeding stacker 22, and this paper feeding roller 30. A paper feed path 31 that guides the fed paper to the pressure contact point of the paper feed roller 8 and the pinch roller 12 described above.
It is composed of. These are attached to a device frame 21 as shown in FIG. 1.2. The device frame 21 is composed of a pair of left and right side plates 32 and 33, and a bottom plate 34 that connects the left and right side plates. 25 rotating shaft 35 and its transmission gear 36.
37, 38, 39, 40, the chucking members 41, 42 to the printing machine A are attached, and the paper feed stacker 22 is installed on the bottom plate 34, and at the same time, the tip 34 of the bottom plate 34 is installed.
a feeds the paper fed by the paper feed roller 30 to paper feed 1-17 a
It constitutes a paper feed path 31 that leads to. A rotating shaft 34 mounted on the left and right side plates 32, 33 is equipped with a paper feeding roller 30, and a gear 36° 38, 39, 40, similar to the rotating shaft of the paper ejecting roller 25 described above.
It is connected to the drive device M on the printing machine A side by
The name is -・It rotates at the timing of the rotation inside the body. In other words, the output shaft 41 of the drive motor M built in the printing machine A
Power is transmitted from the platen paper feed roller 8 to the rotating shaft 8a by gear transmission. A gear 36 on the paper feeder side meshes with the gear 42 in the gear transmission system, and the rotating shaft 35 of the paper discharge roller 25 is driven by the gear 36 and the gear 37.
Rotating shaft 3 of paper feed roller 30 with gear 38° 39.40
4 is designed to rotate. The paper feed roller 34 is composed of two or more rollers separated by a distance in the width direction. The one shown in the figure consists of three pieces, and this is so that it can feed various types of paper with different paper thicknesses and paper widths, which will be described later, by replacing the paper feed stacker. The positional relationship between the paper width and the rollers is selected so that paper with a small width such as a postcard is fed with three rollers, and two rollers are used to feed paper with a small width such as a postcard. A mounting space 43 for a paper feed stacker is prepared between the paper feed roller 30 and the bottom plate 34, and a space 43 for mounting a paper feed stacker is provided in the bottom plate 34 of this space 43. A plate spring guide 44 facing directly below the paper feed roller 30 is attached. This leaf spring guide 44 has a spring action to urge the paper feed stacker mounted in the mounting space 43 toward the paper feed roller 30 side, and at the same time serves as a guide when inserting the stacker into the space 43. It is composed of an inclined plate-like member. In the present invention, such a paper feed stacker is constituted by two or more paper feed cassettes each accommodating sheets of different widths and types. The first cassette body 22A is constructed by attaching separating claws 46a and 46b to the left and right sides of the paper storage frame 45 shown in FIGS. The second cassette body 22B forms a paper feed gap G corresponding to the thickness of one sheet of paper between the tip of the paper storage frame 47 shown in FIGS. 3 and 4 and the paper feed roller 30. The end abutting pieces 48a and 48b are provided, and are respectively attached to the mounting space 43 of the device frame 21. The first cassette body 22A is composed of left and right side plates 45a, 45b, which are integrally molded with resin, and a bottom plate 45C.The left and right side plates 45a, 45b are provided with separation claws 46a, 46b at their tips. The rear end of the arm lever 50 is supported by a pin 49 so that the separation claws 46a, 46b can swing downward. This first cassette body 22A has an idle roller 52a on the bottom plate facing the paper feed roller 30. 52b is embedded, so as to reduce the load when the paper feed roller 30 rotates when the paper in the cassette 1-22A I- is empty. Along with this, the cassette 22A has a projection 53 hanging down at the bottom, and this projection 53 is adapted to match a guide groove 54 formed in the bottom plate 34 of the device frame 21, and the cassette 22A is inserted into the mounting space 43 and set. When doing so, the guide groove 54 is used for positioning in the left and right direction. In addition, the cassette 22A and the device frame 21
The two protrusions 55 formed on one side are fitted into the holes 56 and held in the state shown in FIG. 1 by the two protrusions 55 formed on the other side. In other words, the cassette is in the state shown in Figure 1)
22A is connected at its rear end with a locking protrusion 55 and a locking hole 56, and its tip is swingable around this joint, and is urged toward the paper feed roller 30 by the plate spring guide 44. . Next, in the cassette l-22B, the paper storage frame 47 is connected to the left and right side plates 4.
It is composed of a molded body consisting of sheets 7 a and 47 b and a bottom plate 47 c, and a paper mounting table 57 is arranged inside the storage frame 47 so as to be vertically movable. In other words, the rear end of the platform 57 is connected to the pin 58.
This pin 58 is supported on the bottom plate 47c of the storage frame 47.
The distal end of the platform 57 is supported so as to be movable up and down, and the platform 57 is supported by a spring 59 disposed between it and the bottom plate 47c of the storage frame 47.
is biased toward the paper feed roller 30 side. The illustrated cassette 22B is designed so that cards such as postcards can be stored in both horizontal and vertical positions.
A sliding side plate 60 is attached to one of a and 47b so that its position in the width direction can be adjusted. In other words, the width dimensions of the left and right side plates 47a and 47b are set according to the size of the horizontal position, and the slide side plate 60 is supported by fitting its bent piece 61 into the guide groove 62 of the bottom plate 47c. By moving the slide side plate 60 to the right side in FIG. 4, the paper in the vertical position is held. Similar to the cassette body 22A, this set body 22B is formed with a protrusion 53 that hangs down from its bottom plate 47c, and is adapted to fit into the guide groove 54 of the device frame 21 and be installed at the same time. A latching protrusion 55 is provided. The left and right side plates 47a, 47 of the cassette body 22B are
A positioning piece having a U-shaped groove 63 extending from b fits into the rotating shaft 34 of the paper feed roller 30, and the positional relationship between the paper feed roller 30 and the cassette body 22B, especially the paper feed roller 30 and the tip end abutment. The paper feeding gap between the sheet 48a and the sheet 48a is kept constant. This tip end abutting piece 48a is formed integrally with the storage frame 47, and at the same time locks the leading edge of the paper on the paper table 57 and feeds the topmost sheet in cooperation with the paper feed roller 30. A sheet feed gap corresponding to the thickness of one sheet of paper is formed between the roller and the roller so that the paper feed gap is equivalent to the thickness of one sheet of paper.
is formed only at a position facing the center of the paper feed roller 30. This is to prevent non-feeding by arranging the feed roller at the center of the sheet where the waviness is least when the sheet is wavy or curled in the width direction. Therefore, the present invention relates to the above-mentioned cassette body 22B, and although the cassette body does not necessarily have to be as shown in the drawings, for example, a paper feed stacker can be constructed from the cassette body 22B shown in the drawings. That is, a tip locking piece 48a that forms a paper feed gap for one sheet between the paper storage frame 47 and the paper feed rotation body 30 formed at the tip of the storage frame 47 at 1;
48b, and a paper mounting table 57 whose rear end in the paper feeding direction is supported within the paper storage frame 47 and whose leading end is supported movably downwardly on the paper feeding rotary body side. Then, with the tip 57a of the paper loading table 57 in the maximum stacked state of paper as shown in FIG. 6(b),
- Position the paper forward of Y in the paper feeding direction, and the paper is shown in Figure 6 (A).
The distance between the leading edge 57a of the paper mounting table 57 and the bearing point (bin 58 in the figure) is set so that the leading edge 57a of the paper mounting table moves directly below the center of curvature of the paper feeding rotor as the paper gradually decreases to the state shown in FIG. be. Furthermore, the end locking pieces 58a and 58b of the illustrated embodiment are inclined in two steps toward the paper feeding direction, as shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the paper feeding device of the present invention;
Figure 2 is a top view, Figure 3 is an enlarged sectional view, Figure 4 is a top view of the cassette body 22A, Figure 5 is a schematic diagram of the drive system, Figures 6 (a) and (b) are paper loading tables. It is an enlarged view of. 21...Device machine frame 30...Paper feed rotating body 22
...Cassette body patent applicant: Japan Seimitsu Kogyo Co., Ltd. Procedural Amendment, Kae. July 1988 1311 Commissioner of the Patent Office Kuro 1) Mr. Akio (Examiner of the Patent Office) 2 Name of the invention Paper feeding device 3 Relationship with the case of the person making the amendment Patent applicant address (residence) 1I1 Kofu City, Nashi Prefecture 111 3167 Miyamachi Name: Japan Seimitsu Kogyo Co., Ltd. Address: 1-7 Yukitani Otsuka-cho, Ota-ku, Tokyo Name: Alps Electric Co., Ltd. Published by 4 Agent OO November 25, 1986 ( Date of dispatch) Number of inventions increased due to 6IwJ amendment 8 Contents of amendment 1. As per the engraving and attachment of the specification originally attached to the ll ¥ document (no change in content). 2. An engraving of the drawing originally attached to the application, as shown in the attached sheet (no changes to the content). 3. Submit a power of attorney for Alps Electric Co., Ltd.

Claims (1)

[Scope of Claims] 1. A paper feed rotor connected to an appropriate driving means, a paper feed stacker that sequentially brings up and presses stacked sheets of paper onto the paper feed rotor, and a paper feed stacker provided at the tip of the paper feed stacker. In a paper feeder equipped with a tip locking piece that forms a feed gap for one sheet of paper between the paper feed rotary body and the paper feed stacker, the paper feed stacker is attached to a paper storage frame and the tip of the paper storage frame. It is composed of the formed end locking piece and a paper mounting table whose rear end in the paper feeding direction is supported within a paper storage frame and whose leading end is vertically swingably supported on the paper feeding rotary body side. The leading edge of the paper tray is positioned forward in the paper feeding direction from just below the center of curvature of the paper feed rotor when the paper is loaded at maximum, and as the paper gradually decreases, the leading edge of the paper tray moves to the side directly below the center of curvature of the paper feed rotor. A paper feeding device characterized in that the distance between the leading edge of the paper mounting table and the shaft bearing point is set so as to 2. The paper feeding device according to claim 1, wherein the tip locking piece is inclined in two steps in the paper feeding direction from the bottom of the paper storage frame toward the paper feeding rotating body.