JPH0357482Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bail operating device that automatically moves a bail that presses paper toward and away from a platen of a printing device.

[Conventional technology]

When automating the operation of the bail, it is common to use a solenoid to drive the bail.

Furthermore, as shown in Japanese Utility Model Publication No. 58-2618, there is a technique in which an automated bail operating section is provided outside the main body of the printer. In this technique, a cam rotated by a paper feed motor displaces the bail away from the platen, and a solenoid releases a latch to return the bail.

[Problem that the invention attempts to solve]

As described above, in the past, a solenoid was essential in any case, and automatic bail operation was impossible without this solenoid, but using the solenoid would increase costs.

Further, in the conventional example, since the paper feeding motor is used as the driving source, there is a problem that the paper feeding device becomes large and the attached part becomes large with respect to the main body of the printing device.

An object of the present invention is to automate a bail actuation device without using a solenoid or increasing the size of the device.

[Means for solving problems]

The present invention provides a bail operating device that automatically moves a bail 23 that presses paper toward and away from a platen 12 of a printing device, which includes the bail 23 and is rotatably supported in a fixed position and is always attached in the direction of the platen. The biased bail arm 22 and this bail arm 2
2, which selectively meshes with the platen drive system gear 13 to rotate the bail arm 22, and a carriage 43 of a printing device that controls the arm displacement means 31.

[Effect]

The present invention uses a carriage 43 that operates beyond the normal printing stroke to control the arm displacement means 31, and selectively engages the arm displacement means 31 with the platen drive system gear 13 to rotate the platen drive system gear 13. The bail arm 22 is rotated by
3 is moved away from or returned to the platen 12.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

In FIG. 1, reference numeral 11 denotes a side wall plate of the main body of the printing device, and a platen drive system gear 13 that is substantially integrated with the platen 12 and a motor shaft gear 14 that can mesh with this gear 13 are supported on this side wall plate 11. do.

Further, a bail arm 22 is rotatably supported on the side wall plate 11 by a support shaft 21, and a bail 23 that can move toward and away from the platen 12 is rotatably supported on the upper part of the bail arm 22. . A tension spring 24 is provided between the bail arm 22 and the side wall plate 11 to bias the bail 23 toward the platen 12. Further, a lock leaf spring 25 is provided on the side wall plate 11 of the main body of the printer for holding the bail arm 22 rotated against the tension spring 24 in a state in which the bail 23 is separated from the platen 12.

Further, the bail arm 22 is provided with an arm displacement means 31. This arm displacement means 31 has a latch lever 33 attached to the arm 22 by means of a support shaft 32.
The lever 33 is rotatably supported on a shaft, and a rack portion 34 that can mesh with the gear 13 is provided on one side of the lever 33. Also, this rack portion 34 and the arm 22
A tension spring 35 for biasing the rack portion 34 in a direction away from the gear 13 is provided between the gear 13 and the gear 13.

Further, a shaft 41 is horizontally protruded from the side wall plate 11, and a coil spring-like body 42 is rotatably fitted to the outer peripheral surface of the shaft 41. Further, as shown in FIG. 5, a carriage 43 of the printing device is provided so as to be horizontally movable to a non-printing operation position beyond the end of the normal printing stroke (shown in FIG. 44 is installed protrudingly. As shown in FIG. 5, when the carriage 43 moves to the non-printing operation position, the protrusion 44 presses one end 45 of the coiled spring-like body 42, and the other end of the coiled spring-like body 42 is pressed. Each part is arranged in a positional relationship such that the end part 46 presses the latch lever 33.

Next, the operation of the above embodiment will be explained.

Normally, a sheet of paper (not shown) wound around the platen 12 is conveyed while being held between the bail 23 and the platen 12 in the state shown in FIG.

At this time, the carriage 43 of the printing device is
As shown in FIG. 4, the protrusion 44 does not come into contact with one end 45 of the coiled spring-like body 42 by reciprocating within a range that does not exceed the end of the normal printing stroke.

Next, when the bail 23 is separated from the platen 12, the carriage 43 is displaced beyond the normal printing stroke (this can be easily controlled electrically), as shown in FIG. For this reason,
The protrusion 44 is connected to one end 45 of the spring-like body 42.
, and this spring-like body 42 is
Rotate clockwise as shown in the figure. As a result, the latch lever 33
It is pressed by the other end 46 and rotated clockwise as shown in FIG. 2, so that the rack 34 meshes with the gear 13 and is driven.

That is, as the gear 13 rotates counterclockwise (in the direction of the solid arrow), the rack portion 34 of the rack lever 33 is driven to the right. Therefore, as shown in FIG. 3, the bail arm 22 rotates clockwise about the support shaft 21 and is locked by the lock leaf spring 25, and the bail 23 is rotated clockwise about the support shaft 21. It is held at a distance from the

On the other hand, when the bail 23 is returned to the platen 12 side, the gear 13 is rotated in a clockwise direction (in the direction of the broken line arrow in FIG. The gear 13 may be engaged with the rack portion 34 by pressing the portion 44 against one end portion 45 of the spring-like body 42 .

The above explanation is an example in which the bail 23 is returned by reversing the gear 13. However, the gear 1
It is also possible to return the bail 23 to the platen side using the stored force of the tension spring 24 without reversing the bail 23. To do this, the lock leaf spring 25 may be released in conjunction with the movement of the carriage 43.

That is, as shown in FIG.
A separate protrusion 5 is provided at the bottom of the protrusion 51 corresponding to 4.
2 are provided side by side, and the upper protrusion 51 is provided with a recess 53, and the lower protrusion 52 is provided with a stepped portion 54. 55 is an insertion hole for the lower protrusion 52. Then, the carriage 43 is further advanced from the position shown in FIG. 7, which corresponds to the position shown in FIG. 5 of the embodiment, to the position shown in FIG. As a result, as shown in FIG. 8, when the lock leaf spring 25 is pushed up by the stepped portion 54, the bail arm 22 is released from the leaf spring 25.
It is returned toward the platen by the tension spring 24. At the same time, one end 4 of the coiled spring-like body 42
5 is released from the tip of the protrusion 51 into the recess 53, and the latch lever 33 is returned in the direction away from the gear 13 by the tension spring 35.

The arm displacement means 31 can also be realized by selectively engaging ordinary gears or by using planetary gears instead of the rack lever 33.

Further, in the above description, the means for automatically operating the bail 23 has been described, but it goes without saying that it is also possible to operate the bail 23 manually.

[Effect of idea]

According to the present invention, the bail arm is rotated by the platen drive system gear through the arm displacement means controlled by the carriage of the printing device.
Since the bail is moved toward and away from the platen, the bail actuating device can be automated without using a solenoid as in the prior art. Further, since this bail actuating device uses the platen drive system gear as a driving source, it can be compactly constructed near the platen, and the device does not become large.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the bail actuating device of the present invention, FIG. 2 is a front view showing the engaged state of the arm displacement means, and FIG. 3 is a front view showing the bail arm rotating state. Fig. 4 is a sectional view of the main part thereof, Fig. 5 is a sectional view showing the operating state of the carriage protrusion, Fig. 6 is a sectional view showing a modified example of the carriage protrusion, and Figs. 7 and 8. is a sectional view showing its operating state. 12...Platen, 13...Platen drive system gear, 22...Bail arm, 23...Bail, 3
1... Arm displacement means, 43... Carriage.

Claims (1)

[Claims for Utility Model Registration] A bail operating device that automatically moves a bail that presses paper toward and away from a platen of a printing device, which has the bail and is rotatably supported in a fixed position and always moves toward the platen. The bail arm includes an energized bail arm, an arm displacement means provided on the bail arm that rotates the bail arm by selectively meshing with a platen drive system gear, and a carriage of a printing device that controls the arm displacement means. A bail operating device characterized by: