JP2554909B2 - Printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding drive canceling mechanism of a sheet feeding device which is mounted on a printer and is connected to and driven by a driving device of the printer.

[Conventional technology]

In the conventional paper feeding device, the platen is fed by the printer driving device to correctly position the cut sheet stored in the paper feeding hopper and pressed against the feed roller by the printer drive device. The sheet was conveyed toward the platen by a sheet feeding roller that was rotated in the opposite direction to the drive train and transmitted through the train wheel.

Then, by switching the release of the feed roller that presses the cut sheet set in the sheet feeding device and the continuous sheet set in the push tractor to the platen, the printer that can print on both sheets is provided with the sheet feeding device described above. When it is installed, when feeding single-cut sheets while continuous sheets are being fed to the platen, it is necessary to backfeed this to the position of the push tractor in order to remove the continuous sheets. The driving device is driven in the opposite direction to the sheet feeding, and the driving force is transmitted to the sheet feeding roller by this, so that the cut sheet is fed while the pinch roller is in the release state.

[Problems to be Solved by the Invention]

Therefore, when performing back feeding, there is a problem in that the paper feeding device must be removed from the printer or the paper feeding roller must be released from the cut sheet.

The present invention solves such a problem, and an object of the present invention is to cut a single-cut sheet onto a platen which is reversed by a paper feed roller in order to feed the single-cut sheet to a correct position with respect to the platen. In a paper feeding device having a mechanism for abutting the leading end of a sheet, even if the continuous sheet positioned in the printing unit is back-fed for printing on the sheet, the sheet is not delivered from the sheet storage unit. It is to provide a sheet feeding device having the.

[Means for solving the problem]

The printer according to the present invention includes a tractor that feeds continuous paper to a printing unit, a cylindrical platen that supports the back surface of the paper in the printing unit and rotates in the normal direction, and a printer body that includes a switching mechanism that disconnects power to the tractor. A paper feed roller that feeds single-cut sheets toward the platen, and a power transmission mechanism that transfers power from the printer body to the paper feed roller to rotate it normally only when the platen reverses. When the switching mechanism is switched so as to connect power to the tractor, the power transmission mechanism is interlocked with this to cut off the power transmission to the paper feed roller and switch the power to the tractor off. When the mechanism is switched, the power transmission mechanism is interlocked with this and the power transmission to the paper feed roller is cut off.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the sheet feeding device, and FIG. 2 is a perspective view of a drive transmission mechanism.

Although not shown, the paper feeding device is detachably attached to the upper part of the printer by hooking a hook on the side frame 56 to a set pin of the printer.

First, the configuration of FIG. 1 includes a paper feed unit, a printing unit, a discharged paper path switching unit, and a discharged paper storage unit.

The paper feeding unit includes a hopper for accumulating cut sheets, a paper feeding roller 14 for feeding the cut sheets 1, and auxiliary feeding rollers 15a, 15a.
5b and a tractor 4 on the printer side for feeding the continuous paper 2. The hopper part has a pressure plate 18 on which the cut sheets are deposited, a guide shaft 20 which functions as a guide for moving the pressure plates 18 in parallel, and a cut sheet paper on the pressure plate 18 according to the accumulated amount of the cut sheets. 1 and the paper feed roller 14 are composed of a compression coil spring 19 which enables the same pressure contact. The first
Although not shown in the figure, the cut sheet 1 is provided in the hopper.
Separation claws and slopes are provided to facilitate the separation.

In the above, the timing at which the cut-sheet paper 1 starts to be fed is set such that the cut-sheet paper fed before the cut-sheet paper is discharged sheet storage unit 6 inside the paper feeding device or discharged paper storage outside the paper feeding device. It is configured to start from the time when the discharge to the front cover 7, which is a part, is completed.

By the time the single-cut sheet 1 is fed and until the end of paper discharge, the continuous paper is on standby at the position of the tractor 4, and when the printer is set to change the paper, the single-cut sheet 1 is The tractor 4 operates to feed the continuous paper 2 from the time when the paper discharge is completed. Also, while continuous paper 2 is being fed,
The cut sheet 1 is in a standby state at the hopper.

The printing unit is on the printer side, and includes a platen 3 around which a single-cut sheet 1 or a continuous sheet 2 for printing is wound, and a platen 3
Hold the paper when winding the single-cut paper 1 around the continuous paper 2
In the case of, the feed roller 10 for releasing the holding, the head 13 for printing, and the pull-up roller 22 for sending out the cut sheet 1 or the continuous sheet 2 after printing to the discharge sheet path switching section.
It is composed of a and 22b.

The ejected paper path switching unit defines a discharge path for the paper discharged from the printing unit when printing is completed in the paper feeding device, and a guide lever 9 to which the discharged paper path switching plate 5 is fixed. And the cut sheet storage unit 6 in the sheet feeding device
Ejection roller 24 for delivering to, ejection roller 24 and cut sheet 1
A paper ejecting roller B25a for nipping and ejecting the paper in the direction of the claw 23 integrally formed with the front frame 12 for holding the paper and the front cover 7 serving as a paper storage unit outside the paper feeding device.
It consists of b.

The discharged paper storage unit includes a discharged paper storage unit 6 inside the paper feeding device, a front cover 7 serving as a discharged paper storage unit outside the paper feeding device, and a front stacker board 17 inserted and connected to the front cover 7. Has become.

FIG. 2 shows that the cut sheet 1 is fed from the hopper section to the printing section, and the cut sheet 1 or the continuous sheet 2 for which printing has been completed is ejected into the sheet feeding section 6 inside the sheet feeding apparatus or outside the sheet feeding apparatus. Of the gear trains to be ejected to the front cover 7 of FIG. 1, one of which is in the disengaged state. The relacing lever 26 has a rod shape with a semicircular cross section at its tip. The relacing lever 26, when the paper feeding device is installed in the printer,
As shown in FIGS. 4 and 5, the side curved portion of the relacing lever is set at a position where it abuts on the lock lever pushing portion 28.

The structure for transmitting or releasing the driving force of the platen gear 37 to the paper feed gear 38 is such that a lock lever push that abuts the relacing lever 26 on the printer side that operates according to the discharge paper path switching command on the printer side and rotates by the raising operation. The lock lever 27 having the portion 28 and the lock lever pin tip portion 39 which is in contact with the rotation lever 9a when the lock lever 27 is rotated around the rotation shaft 36 are integrally slidable so that the contact can be released. The movable lock lever pin 33 and the rotation of the lock lever 27 compress the compression coil spring 30 to form a sliding gear shaft 35. The lock lever 27 is rotatable about a rotation shaft 36. , The sliding gear shaft 35 is guided to rotate.

The sliding gear shaft 35 has a slidable gear 29, a compression coil spring 30, and a flange 31, and an E ring 32 is fixed by biting to the sliding gear shaft 35 so that the flange 31 can move from the sliding gear shaft 35. The structure prevents the disengagement and pushes the lock lever 27 via the gear 29 by the compression coil spring 30.

When the release lever 26 provided on the printer side moves from the position shown in FIG. 3 to the position shown in FIG. 2, it abuts against the lock lever push portion 28 having the warped shape of the tip of the lock lever 27, and from the abutting position. As the relacing lever 26 rotates to the position shown in FIG. 2, the lock lever push portion 28 is raised to compress the compression coil spring 30 via the gear 29,
The gear 29 is disengaged from the mesh of the drive gear train.

The structure of the drive transmission system shown in FIGS. 2, 3, and 6 is as follows.

When the platen gear 37 rotates, the platen transmission gear 42 meshes with the platen gear 37 and is transmitted.
29, the drive gear A48, the drive gear B49, the drive gear C50, the planet gear A57, and the planet gear C51 are transmission-rotated. The drive gear C50 is shown by an imaginary line in FIG. 6 and is arranged on the upper surface of the planetary gear A57, etc., and has a drive gear B49, a planetary gear C27, and a planetary gear B58.
Is meshing with. Also, drive gear C50a and drive gear C50
And are fixed on the same shaft. The planetary lever B is rotatably supported coaxially with the drive gear C50 with a predetermined friction torque, and at its ends, a planetary gear A57 and a planetary gear C51 are respectively supported. The planet gear B58 is the planet lever A59.
Is rotatably supported at the end of, and the planet lever A59 is
It is pivotally supported coaxially with the drive gear C50 with a predetermined friction torque. The driving force transmitted to the paper discharge transmission gear 43 is transmitted to the paper discharge drive gear A44 and the paper discharge drive gear B45, and further fixed coaxially with the paper discharge roller 25a and the paper discharge gear A46 and the paper discharge roller 25b. It is configured to be transmitted to the paper discharge gear B47, rotate the paper discharge rollers 25a and 25b, and further rotate a paper discharge gear C55 fixed coaxially with the paper discharge roller 24 by a paper discharge drive gear B45.

 Next, the sheet feeding operation of the cut sheet 1 will be described.

FIG. 3 is a perspective view of the drive transmission mechanism when the gear trains of the drive transmission mechanism are in mesh with each other.

FIG. 4 is an enlarged view of an essential part showing a state where the gear train meshes with each other and the driving force of the platen gear 37 is transmitted to the paper feed gear 38.

 FIG. 6 is a side view showing a gear train.

When the platen gear 37 rotates counterclockwise (reverse rotation),
The rotational force is transmitted by the gear train described above, and the drive gear C50
Normally rotates, the planetary lever A59 and the planetary lever B60 rotate normally, the planetary gear B58 meshes with the paper feeding gear 38 fixed coaxially with the paper feeding roller 14, and the planetary gear A57 coaxially fixes with the auxiliary roller 15a. By meshing with the drive transmission intermediate wheel 52 engaged with the auxiliary gear A53, the paper feed roller 14 and the auxiliary roller 15a rotate in the direction of feeding the cut sheet 1 to the platen 3. On the other hand, when the platen 3 rotates normally, the planetary gear B58 moves away from the paper feed gear 38 and the planetary gear A58
57 moves away from the drive transmission intermediate wheel 52, and at the same time, the planetary gears
C51 meshes with auxiliary gear B54. Therefore, the paper feed roller 14 is cut off, and the auxiliary roller 15a moves the platen 3 to the cut sheet 1
Rotate in the direction of feeding. When the cut sheet 1 is fed by the sheet feeding device as described above, it is necessary to press the feed roller 10 of the printer main body against the platen 3. In this case, the release lever 26 is tilted by a command from the printer so that the tractor 4 is driven so as to be in the above state.

On the other hand, when the continuous paper 2 is used, the drive is transmitted to the tractor 4 in the printer body by instructing the release lever 26 to move the feed roller 10 away from the platen 3 and tilting it. When the release lever 26 is tilted in this direction, the lock lever push portion 28 provided on the lock lever 27 rotatably attached to the stopper 11 is provided.
And the tip of the release lever 26 come into contact with each other, and the lock lever 27 rotates in a direction to compress the compression coil spring B30 via the gear 29 about the rotation shaft 36. At this time, since the gear 29 is displaced in the compression direction of the compression coil spring B30 by the lock lever 27 so that the gear 29 does not mesh with the platen transmission gear 42, the driving force of the platen gear 37 and the auxiliary gear 38 Does not reach gear A53. Therefore, the paper feeding operation by the paper feeding device is not performed. As a result, the continuous sheet 2 is fed to the head 13 for normal rotation of the platen 3 for printing, and the continuous sheet 2 is fed to the printer in preparation for feeding the cut sheet 1 to the printer. Even if the platen 3 is rotated in the reverse direction to retract the sheet 1 out of the moving path, the sheet feeding roller 14 and the auxiliary roller 15a of the sheet feeding device do not rotate. It will not be sent.

Next, when using the cut sheet 1 again, after retracting the continuous sheet 2 by the above-described operation, when the release lever 26 is tilted in the direction in which the field roller 10 is pressed against the platen 3, the tip of the release lever 26 is moved. , The lock lever 27 is completely separated from the lock lever 27, and the lock lever 27 is not restricted by the release lever 26. Therefore, the lock lever 27 is rotated by the compression coil spring B30 in which the gear 29 is always engaged with the platen transmission gear 42. . Then, when the gear 29 is completely engaged with the platen transmission gear 42, the lock lever 27
The lock lever 27 is locked by a stopper 11 provided so as to lock the lock lever 27 when the lock lever 27 rotates. Therefore, driving the platen gear 37 again
Since it is transmitted to 29, the paper feeding operation by the above-mentioned paper feeding device can be performed.

〔The invention's effect〕

The printer according to the present invention has a sheet feeding device provided with a power transmission mechanism for transmitting power from the printer main body to the sheet feeding roller to normally rotate only when the platen rotates in the reverse direction, and has a switching mechanism for connecting the power to the tractor. When switched, the power transmission mechanism works in conjunction with this to cut off the power transmission to the paper feed roller,
When the switching mechanism that cuts off the power to the tractor is switched, the power transmission mechanism works in conjunction with this to cut off the power transmission to the paper feed roller. Since the form paper is fed and the power to the paper feed roller is cut off when the power to the tractor is connected, even if the continuous form is reversely fed, the single form paper is not mistakenly fed. .

[Brief description of drawings]

FIG. 1 is a sectional view of a paper feeding device. FIG. 2 is a perspective view of the drive transmission mechanism. FIG. 3 is a perspective view of the drive transmission mechanism when the gear trains of the drive transmission mechanism are in mesh with each other. FIG. 4 is an enlarged view of essential parts showing a state in which the gear trains mesh with each other and the driving force of the platen gear is transmitted to the paper feed gear. FIG. 5 is an enlarged view of an essential part showing a state where the gear train is disengaged and the driving force of the platen gear is not transmitted to the paper feed gear. FIG. 6 is a side view showing a gear train. 1 …… Single-cut paper 2 …… Continuous paper 3 …… Platen 4 …… Tractor 5 …… Discharged paper path switching plate 6 …… Discharged paper storage 7 …… Front cover 7a …… Front cover joint 8 …… Front Center of rotation of cover 9 ...... Guide lever 9a …… Rotation lever 9b …… Guide lever joint 10 …… Feed roller 11 …… Stopper A 12 …… Front frame 13 …… Head 14 …… Paper feed roller 15a, 15b …… Auxiliary roller 16 …… Stacker board 17 …… Front stacker board 18 …… Pressure plate 19 …… Compression coil spring 20 …… Guide shaft 21 …… Hopper body 22a, 22b …… Pulling roller 23 …… Claw 24 …… Discharge Paper rollers 25a, 25b …… Paper discharge rollers B 26 …… Release lever 27 …… Lock lever 28 …… Lock lever push part 29 …… Gear 30 …… Compression coil spring B 31 …… Flange 32 …… E ring 33…. …Lock Lever pin 34 …… Pin guide 35 …… Sliding gear shaft 36 …… Rotating shaft 37 …… Platen gear 38 …… Feeding gear 39 …… Lock lever pin tip 40 …… Torsion coil spring 41 …… Guide lever shaft 42 …… Platen transmission gear 43 …… Paper ejection transmission gear 44 …… Paper ejection drive gear A 45 …… Paper ejection drive gear B 46 …… Paper ejection gear A 47 …… Paper ejection gear B 48 …… Drive gear A 49… … Drive gear B 50 …… Drive gear C 50a …… Drive gear C 51 …… Planet gear C 52 …… Drive transmission intermediate wheel 53 …… Auxiliary gear A 54 …… Auxiliary gear B 55 …… Paper discharge gear C 56… … Side frame 57 …… Planet gear A 58 …… Planet gear B 59 …… Planet lever A 60 …… Planet lever B 61 …… Stopper B

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tsutomu Hoshino 347 Hino, Hino-shi, Tokyo Orient Watch Co., Ltd. (72) Inventor Akira Okuma 347 Hino, Hino-shi, Tokyo Orient Watch Co., Ltd. (72) Inventor Yoshinobu Ofuze 347 Hino, Hino City, Tokyo Orient Watch Co., Ltd.

Claims (1)

(57) [Claims] 1. A printer main body comprising a tractor for feeding continuous paper to a printing unit, a cylindrical platen for supporting the back side of the paper in the printing unit and rotating in the forward and reverse directions, and a switching mechanism for connecting and disconnecting the power to the tractor. A sheet feeding roller that feeds cut sheets toward the platen, and a power transmission mechanism that transmits power from the printer body to the sheet feeding roller only when the platen rotates in the reverse direction and has a power transmission mechanism that rotates in the normal direction, and is detachably set in the printer body. A printer having a sheet feeding device, wherein when the switching mechanism is switched to connect power to the tractor, the power transmission mechanism is interlocked with the switching mechanism to cut off power transmission to the sheet feeding roller. When the switching mechanism is switched so as to cut off the power to the tractor, the power transmission mechanism is interlocked with this to cut off the power transmission to the paper feed roller. Data.