JP2587263Y2 - Paper feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder attached to a printer or a printing device such as a personal word processor. 2. Description of the Related Art Generally, a printing device such as a printer is supplied with paper to be printed from a paper feeding device. The supply device is attached to a paper supply / discharge port of the printing device, and supplies the paper of the paper supply stacker to a platen of the printing device by a paper supply roller, and discharges the paper printed on the platen with the discharge roller and the discharge roller. The sheet is stored in a sheet discharge stacker through a space between the sheet roller and a guide pressed against the sheet roller. [Problems to be Solved by the Invention] However, the paper supplied from the paper feed stacker to the platen is printed, for example, by being wound around a roll-shaped platen, so that the paper discharged to the paper discharge stacker is curled inward. When the paper is stored in the paper output stacker, the leading edge does not slide up along the paper output stacker, and the paper is discharged while being curled inward. May be conversely accommodated. This is more noticeable as the paper is thinner. SUMMARY OF THE INVENTION The purpose of the present invention is to provide a paper feeder capable of storing paper in a paper discharge stacker with less curl. DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. <Structure> As shown in FIG. 1, a paper feeding device B is detachably attached to a printing device A such as a printer, and sheets are separately supplied to a paper feeding port of the printing device A one by one. The printing device A is, for example, a thermal transfer printer, and a platen 1 for backing up a sheet at a printing unit P, and a printing element 2
A carriage 3 on which the print element 2 is mounted and which moves step by step at every character interval; 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 for the paper feed mechanism 4 M (FIG. 5), prints on the paper with the print element 2 in response to a print signal output from a computer or an input key, moves the carriage 3 step by step in accordance with the character interval, and performs the next print. Is to be executed. When printing for one line is completed, the paper feed mechanism 4 is operated to step-feed the sheet to the next line. The platen 1 is fixedly supported by a frame 6 in a casing 5. 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, and paper is taken in from a paper feed port 7a at one end, printed at a portion of the platen 1, and discharged from a paper output port 7b at the other end. It has become. In the paper path 7, a paper feed mechanism 4 for feeding the paper to the platen 1 site and stepwise feeding the paper at the platen 1 site is prepared as follows. In the drawing, the platen 1 does not have a paper feed function, so that a paper feed roller 8 is rotatably supported on the frame 6 separately from and adjacent to the platen 1. Has one end connected to the drive motor M shown in FIG. 5 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 opposed to the paper feed roller 8 with the paper path 7 interposed therebetween, and pinch rollers 12 and 13 are provided.
Is arranged. The pinch rollers 12 and 13 are arranged in two rows near the paper feed port 7a and near the platen 1, and are fixed to the frame 6 by screws 15 so that the leaf spring holder 14 constantly presses against the paper feed roller 8 side. It is. The carriage 3 has a trailing end 3a fitted on a guide rail 16 of the frame 6 and a leading end 3b fitted on a shaft 17 attached to the frame 6 so as to be movable left and right in the paper width direction. At the same time as not shown, it is fixed to an endless wire that is stretched over pulleys at the left and right ends of the platen 1 as usual.
A stepping motor is connected to one of the pulleys. Therefore, a printing element 2 composed of a thermal head is mounted on the carriage 3 so as to swing on a shaft 19 so as to abut on the platen 1 during printing and to be separated when printing is not performed, and is connected to a printing control circuit by flexible wiring. ing. Furthermore, 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 being printed, determines the last line of printing, stops the printing operation, and simultaneously rotates the paper feed roller 8 by a predetermined amount. Exit paper
Discharge from 7b. In the illustrated printer, the paper feed mechanism 4 is fixed to the fixed platen 1.
However, the platen itself is constituted by a rotatable roller-shaped member, and a pinch roller is pressed against the platen itself, and a driving motor is connected to the roller-shaped platen. The paper may be fed by rotating the platen. The paper feeding device B is detachable from the frame 6 of the printing device A,
An apparatus frame 21; a paper feed stacker 22 connected to the paper feed port 7a of the printing apparatus A; a paper feed roller 30 for engaging the uppermost sheet of paper loaded and stored in the paper feed stacker 22; A paper feed path 31 for guiding the paper fed by the roller 30 to a pressure contact between the paper feed roller 8 and the pinch roller 12, and a paper discharge rotator such as a paper discharge roller 25 disposed near the paper discharge port 7 b of the printing apparatus A. And an openable and closable discharge guide 26 for guiding a sheet to the discharge stacker 23 facing the discharge roller, and a discharge stacker 23. As shown in FIG. 2, the device frame 21 has a pair of left and right side plates 32, 33.
And a bottom plate 34 connecting the both side plates 32 and 33, and the left and right side plates 32 and 33 have a rotating shaft 30a of the sheet feeding roller 30.
Shaft 35 of the paper discharge roller 25 and its transmission gears 36, 37, 3
8, 39, 40, chucking members 41, 42 for the printing device A are attached. At the same time that the sheet feeding stacker 22 is skirted on the bottom plate 34, the tip 34a of the bottom plate 34 constitutes a sheet feeding path 31 for guiding the sheet fed by the sheet feeding roller 30 to the sheet feeding port 7a. The rotation shaft 30a attached to the left and right side plates 32, 33 is provided with a paper feed roller 30 and the above-described paper discharge roller.
Similarly to the rotation shaft 35 of 25, the drive motor M of the printing apparatus A is connected to the drive motor M by gears 36, 38.39, 40, and the three members of the paper feed roller 30, the platen paper feed roller 8, and the paper discharge roller 25 are integrated. Are rotated at the same timing. That is, the output shaft of the drive motor M built in the printing device A
Power is transmitted from 41 to the rotating shaft 8a of the platen paper feed roller 8 by gear transmission. A gear 36 in the paper feeder B engages with a gear 42 in the gear transmission system, and the rotating shaft 35 of the sheet discharging roller 25 is driven by the gear 37 from the gear 36, and the gear 36
The rotation shaft 30a of the paper feed roller 30 rotates at 39 and 40. 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 replacing 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. The paper feed stacker 22 is provided between the paper feed roller 30 and the bottom plate 34.
An apparatus space 43 is prepared, and a leaf spring guide 44 which rises from the rear end in the sheet feeding direction to the front end and faces directly below the sheet feeding roller 30 is attached to the bottom plate 34 of the space 43. The leaf spring guide 44 is provided with a spring action to urge the paper feed stacker 22 mounted in the mounting space 43 toward the paper feed roller 30, and at the same time, guides the insertion of the stacker 22 into the space 43. It is composed of a plate-like member that is inclined so as to serve also. The paper output stacker 23 includes a paper rear end receiving portion 23a and a rear receiving portion 2a.
3b and a manual insertion slit 27 for inserting a sheet from the illustrated gap between the two receiving portions. As shown in FIG. 3, the paper trailing end receiving portion 23a has a plurality of ribs 77 provided on the back receiving portion 23b side and a second projecting portion 75 for correcting the curl of the paper discharged to a portion covering the rotating shaft 35. And The rear receiving portion 23b is provided with a plurality of ribs 79 inclined so that the paper discharged by the paper discharge roller 25 and the guide 26 does not enter the manual feed slit 27. 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 7a of the printing apparatus A. A paper discharge path 29 from the paper discharge port 7b of the printing apparatus A to the paper discharge stacker 23 is formed between the paper discharge roller 25 and the paper discharge guide 26. Feed mechanism 4
The paper is discharged at the same speed as the paper transport speed. The paper discharge guide 26 rotates around a shaft 73, and the inside thereof comes into contact with the paper discharge roller 25. Inside the paper discharge guide 26, the sheet sandwiched between the paper discharge guide 26 and the paper discharge roller 25 is placed on the platen 1 side, that is, upstream of the contact point between the paper discharge guide 26 and the paper discharge roller 25. A first protruding portion 71 is provided for correcting the curl generated in the U-turn through 1 in a direction opposite to the curl direction. The paper feed stacker 22 of this embodiment is composed of two or more paper feed cassettes that respectively store sheets of different widths and other types. The first cassette body 22A is configured by attaching separation claws 46a and 46b to be engaged with the top end edge of the paper to be stored in the left and right sides of the paper storage frame 45 shown in FIG. The cassette body 22B has a leading end abutting piece that forms a paper feed gap G corresponding to the thickness of one sheet between the paper feed roller 30 and the front end of the paper storage frame 47 shown in FIGS. 48a and 48b are provided, and each is attached to the mounting space 43 of the apparatus frame 21. The first cassette body 22A is composed of left and right side plates 45a and 45b and a bottom plate 45c obtained by integrally molding a paper storage frame 45 with a resin, and arm levers having separation pawls 46a and 46b at their ends at the left and right side plates 45a and 45b. Attach the rear end of 50 with a pin 49, and
a, 46b are 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 first cassette body 22A runs out, the paper feed roller 30 In order to reduce the load when rotating. At the same time, the first cassette body 22A has a projection 53 hanging down from the bottom.
The guide groove 54 formed on the bottom plate 34 is designated by the reference numeral, and when the first cassette body 22A is inserted and set in the mounting space 43, the guide groove 54 is positioned in the left-right direction. In addition, the first cassette body 22A and the apparatus frame 21 are fitted and locked with the locking projections 55 formed on one of them and the locking holes 56 formed on the other, so that they are held in the state of FIG. It has become. 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 locking hole 56, and the front end can swing freely about this connection part. Urges the paper feed roller 30 side. Next, the second cassette body 22B is configured such that the paper storage frame 47 is
It is composed of a molded body of 7a, 47b and a bottom plate 47c, and a paper table 57 is arranged inside this storage frame 47 so as to be vertically movable. In other words, the rear end of the paper loading table 57 is pin 58 with the bottom plate 47c of the storage frame 47.
The top end of the paper loading table 57 is attached to the paper feed roller 30 by a spring 59 disposed between the storage frame 47 and the bottom plate 47c. I'm going. In the illustrated second cassette body 22B, one of the left and right side plates 47a and 47b of the storage frame 47 can adjust the widthwise position of one of the left and right side plates 47a and 47b so that cards such as postcards can be stored in a horizontal position or a vertical position. Installed. That is, the width dimension of the left and right side plates 47a and 47b is 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 side plate 60 to the right side 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. The left and right side plates 47a, 47 are provided on the second cassette body 22B.
A positioning piece having a U-shaped groove 63 extending from b is fitted to the rotating shaft 30a of the paper feed roller 30, and the positional relationship between the paper feed roller 30 and the second cassette body 22B, especially the paper feed roller The paper feeding gap between 30 and the front end abutting piece 48a is kept constant. The leading end abutting piece 48a is formed integrally with the storage frame 47. The leading end abutting piece 48a locks the leading end of the sheet on the sheet placing table 57 and simultaneously repeats one of the uppermost sheets with the sheet feeding roller 30. A sheet feeding gap corresponding to the thickness of one sheet is formed between the sheet feeding roller 30 and the sheet feeding roller 30. Only formed. This is because when the paper undulates or curls in the width direction, the paper is arranged at the central portion of the sheet feeding roller where the undulation is the least, thereby preventing non-feeding. <Operation> In the configuration described above, this device operates as follows. For example, when the printing apparatus A operates with the second cassette body 22B mounted as shown in FIG. 3, the paper feed roller 30 rotates to feed out the paper in the second cassette body 22B. This paper is fed to the platen 1 by the paper feed roller 8 and printed by the print element 2. This paper is guided by the paper ejection guide 26,
The paper is discharged while being nipped by the paper discharge rollers 25. The leading edge of the sheet rises along the sheet discharge stacker 23, and when the trailing edge separates from the sheet discharging roller 25, the trailing edge falls onto the sheet trailing edge receiving portion 23a, and the sheet is stored. The above operations are repeated, and continuous paper feeding and continuous printing are performed. According to the above-described embodiment, the paper sandwiched between the paper ejection guide 26 and the paper ejection roller 25 is placed inside the paper ejection guide 26 toward the platen 1 from the contact point between the paper ejection roller 25 and the paper ejection guide 26. Since the first protrusion 71 is provided to correct the curl generated in the U-turn through the platen 1 in a direction opposite to the curl direction, the curl is held between the paper discharge roller 25 and the paper discharge guide 26. The rear of the sheet is bent by the first protrusion 71. For this reason, the sheet is corrected by the first projecting portion 71 in the direction opposite to the curl direction of the curl generated when making a U-turn through the platen 1, and even if the sheet is thin,
It will no longer be housed at 23. In addition, since the second protrusion 75 that protrudes in the direction of the paper ejection guide 26 is provided in the paper rear end receiving portion 23a, the paper that is bent between the paper ejection rollers 25, 25 is pushed upward, and the paper becomes wavy. As a result, the paper becomes stiff and the curl of the paper can be corrected. [Modifications] One embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and for example, the following modifications are possible. (1) As shown in FIG. 6, the first protruding portion 71 is protruded from the upper side inside the paper discharge guide 26 in the direction of pressing the paper, and the second protruding portion 75 is provided so as to direct the paper upward. May be conveyed in an S-shape to correct the curl of the sheet. (2) In the above embodiment, the first protrusion 71 is provided so as to correspond to the middle discharge roller 25, but may be provided to correspond to each discharge roller 25. Further, the first protrusion 71 may not be provided on both sides of the paper discharge roller 25, but may be provided only on one side. In summary, the present invention is concerned with the curl generated when the paper sandwiched between the guide and the paper discharge roller makes a U-turn through the platen by the first protrusion provided inside the guide. Since the paper is corrected in the direction opposite to the curl direction and the corrected paper is supported by the second protrusion, even if the paper is thin, the paper is stored in the paper discharge stacker in a state of less curl. And a paper feeder capable of performing the above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 are views showing an embodiment of the present invention, FIG. 1 is a cross-sectional view showing the overall configuration, FIG.
FIG. 3 is a sectional view showing a main part of this embodiment, FIG. 4 is a plan view showing the configuration of the cassette body 22A, and FIG. 5 is a schematic diagram of a drive system. FIG. 6 is a diagram showing a modification of the present invention. A printing device, B paper feeding device 1 platen 22, paper feeding stacker 23 paper discharging stacker 25 paper discharging roller 26 paper discharging guide 71, first protrusion Part 75: second protrusion

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tokihiro Nagata               3167 Yamamiyacho, Kofu Nippon Seimitsu Kogyo Co., Ltd.               In the formula company (72) Inventor Toshiaki Amano               1-7 Yukiya Otsukacho, Ota-ku, Tokyo Al               Within Pus Electric Co., Ltd.                (56) References Japanese Utility Model Sho 61-62754 (JP, U)

Claims (1)

(57) [Rules for requesting registration of utility model] The paper stored in the paper feed stacker is separated one by one and fed to the printing device, and the printed paper discharged from the printing device after being U-turned by the paper feeding mechanism in the printing device is discharged to the discharge stacker. A paper discharge device which is provided in a width direction to discharge the printed paper to the paper discharge stacker; and A guide that guides the paper along the paper ejection roller, wherein the paper ejection roller and the guide are configured to pinch and eject the printed paper, and a first paper provided inside the guide is provided. A protruding portion, and a second protruding portion provided on the paper trailing end receiving portion of the discharge stacker so as to face the guide, and the first protruding portion or the second protruding portion is provided on the guide. And the discharge row And a curl direction generated when the printed sheet is U-turned through the paper feed mechanism at the first projecting portion, in a direction opposite to the curl direction. , The second
A sheet discharge path configured to push up a sheet bent between sheet discharge rollers by a protrusion of the sheet upward to correct curl of the sheet.