JPH0517239Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a paper feeding device for a thermal master in a flat type mimeograph machine.

(Prior art) In the conventional flat-type mimeograph machine, the thermal master is
The paper is passed from the first paper feed roller to the second paper feed roller and then to the paper ejection roller, but wrinkles may occur in the mimeograph paper (thermal master) between the paper ejection roller and the second paper feed roller. Ta. In addition, the second paper feed roller is
Since it affects skew, etc., there is a need for adjustment, and there are problems such as the adjustment requires skill.

In other words, with conventional devices in which the operation of the second paper feed roller does not release even after the base paper is transported by the second paper feed roller and transferred to the next transport means (for example, a platen roller), the operation of the second paper feed roller is not released. The speed error causes stress such as loosening and elongation to the base paper, which adversely affects the paper passing performance.

For this reason, devices have been devised to release the second paper feed roller.

FIG. 6 is a diagram illustrating an example of a release device for the second paper feed roller in the paper feed device of a flat type mimeograph machine.

In FIG. 6, 31 is the lower second paper feed roller;
2 is an upper second paper feed roller, 33 is a lever, 34 is a spring, and 35 is a cam.

The shaft of the lower second paper feed roller 31 is fixedly attached, and the upper second paper feed roller 32 is connected to the lever 3.
3. This lever 33 has a shaft 33
It is rotatably provided around a, and a spring 34
It is biased clockwise in Figure 6. Lever 33
A roller 33b is provided at the other end and is in contact with the cam surface of the cam 35. This cam 35 is
It is driven by a dedicated motor.

Before plate making, the second paper feed rollers 31 and 32 are in contact with each other (FIG. 6b), but the motor is turned on in synchronization with the transfer of the mimeograph paper to the next conveyance means. is driven, the cam 35 rotates, and the lever 3
3 counterclockwise, and rotate the upper second paper feed roller 32.
was floating above the lower second paper feed roller 31.

In addition, a solenoid or the like has been used as a device for floating the second paper feed roller 32.

(Problems to be solved by the invention) In such a device, the drive of the second paper feed roller must be controlled using a timing sensor, an electromagnetic clutch, a cam mechanism, a control circuit, etc., and the device itself is There were problems in that it was expensive and generated noise during operation.

The present invention uses a simple mechanism in which the second paper feed roller is linked to the thermal head up/down mechanism.
After the second paper feed is activated, this roller is lifted from the base paper transport surface to improve the paper passing performance of special paper called mimeograph paper, and to prevent the occurrence of wrinkles in the mimeograph paper. The purpose is to provide a paper feeding device.

(Means for solving the problem) As a result of intensive study, the inventors of this case have determined that a mechanism in which the thermal head moves up and down with respect to the platen roller is implemented as an indispensable means in a plane mimeograph machine. By focusing on this, we linked the second paper feed roller to this up-and-down mechanism, which is much more effective than means for controlling the second paper feed roller independently (means such as timing sensors, electromagnetic clutches, cam mechanisms, control circuits, etc.). The conclusion was reached that it is possible to realize simple and reliable timing operation.

In other words, the paper feeding device of the flat-plane mimeographing machine according to the present invention includes a thermal head whose base side is pivoted on a fulcrum shaft and whose heat generating part is provided facing the platen roller, and a direction in which the thermal head is pressed against the platen roller. and a head drive mechanism that rotates the thermal head about the fulcrum shaft to raise and lower the heat generating part, and includes a first paper feed roller, a second paper feed roller, and a discharge roller. In a paper feeding device of a flat mimeograph machine that conveys a mimeograph paper by a paper roller, a bearing portion of the second paper feeding roller is connected to the opposite side of the fulcrum shaft of the thermal head, and the second paper feeding roller It is configured to operate in the opposite direction to the lifting and lowering movement of the head.

According to the above configuration, after the second paper feed roller sends the mimeograph paper (thermal master) sent by the first paper feed roller to the paper ejection roller, the thermal head descends to the platen roller and the plate is made. However, at the same time as the thermal head descends to the platen roller,
The second paper feed roller on the upper side is floated, and the mimeograph paper can be transported by the paper discharge roller. At this time, since the mimeograph paper has already reached the paper ejection roller, the mimeograph paper is fed by a single drive, and wrinkles and the like no longer occur.

(Example) The present invention will be described in detail below with reference to the drawings and the like.

FIG. 1 and FIG. 2 are front views showing an embodiment of a paper feeding device of a plane mimeograph machine according to the present invention,
FIG. 1 is a diagram showing the second paper feed roller before the release operation, and FIG. 2 is a diagram after the release operation.

3 and 4 are a plan view and a side view showing the second paper feed roller release mechanism section of the apparatus according to the embodiment.

FIG. 5 is a front view showing the overall configuration of a plane mimeograph machine to which the paper feeding device according to the present invention is applied.

First, with reference to FIG. 5, the overall configuration of a plane mimeograph machine to which a paper feeding device according to the present invention is applied will be briefly described.

The original 2 placed on the original paper table 1 is fed by upper and lower original first feeding rollers 4 and 5, and guided to the lower surface of the conveyor belt 6. The document 2 is conveyed by the conveyor belt 6 between the lower surface of the conveyor belt 6 and the glass 3 above the reading sensor 7, and is read by the reading sensor 7.
Its contents are read. The original 2 that has been read is ejected by an original ejecting roller 9.

In parallel with this operation, the thermal master 12 stored in the paper feed cassette 11 is separated into one by the paper sorting plate 13.
While the sheets are being sorted one by one, the master first feed roller 14
The paper is fed by The heat-sensitive master 12 further includes:
The paper is conveyed onto the platen roller 16 via the master second paper feed roller 15 . The thermal head 17 is lowered by a drive device (not shown), and the contents read by the reading sensor 7 are amplified by the amplifier 8 and then subjected to thermal plate making via the heat generating part of the thermal head 17. When the plate making is completed, the thermal head 17 is raised, and the plate-made thermal master 12 is
The paper is ejected by the master paper ejection roller 18.

Next, the paper feeding device for a plane mimeograph machine according to the present invention will be further explained.

As shown in FIG. 1, the thermal head 17 and the second paper feed roller 15 are supported by the same lever 20, which is connected to a fulcrum shaft 21.
(Fig. 3).

As shown in FIG. 4, the machine frame 22 includes a board 23.
is provided, and a motor 24 is attached to this board 23. As the motor 24, a small
A DC motor is used, and a pinion gear 25 is provided on its output shaft. This pinion gear 25 meshes with a rack 26a of a moving table 26. The upper surface of the moving table 26 has a cam surface 26b.
is formed, and is moved in the left-right direction in FIG. 4 on the substrate 23 by rotation of the motor 24.

A roller 28 provided on the lever 19 is in contact with the cam surface 26b of the moving table 26. Lever 1
The other end of the thermal head 17 is attached to the left side of the thermal head 17 in FIG.
is urged downward in FIG. 4 by a push spring 29.
A platen roller 16 is provided below the heat generating portion of the thermal head 17.

Next, the operation of the present invention will be explained.

The thermal master 12 is fed by a first paper feed roller 14 and conveyed to a second paper feed roller 15 .
Furthermore, the paper is sent by the second paper feed roller 15 to the paper discharge roller 18 via the platen roller 16 .

Immediately after that, the thermal head 17 descends and the second
The paper feed roller 15 is raised, and the paper is conveyed and made into a plate at the same time by the drive of the paper discharge roller 18.

After the plate making is completed, the thermal head 17 is raised and the second paper feed roller 15 is lowered. The thermal master 12 is ejected, the second paper feed roller 15 is brought into contact, and the next paper is fed.

Next, the thermal head 17 and the second paper feed roller 1
The elevating mechanism of No. 5 will be explained in detail.

Before plate making, as shown in FIG.
is located on the far right side and is located at a high lifting height portion of the cam surface 26b. Therefore, the thermal head 17
As shown in FIG. 1, the fulcrum shaft 2 is
1, and the heat generating part is separated from the platen roller 16.

On the other hand, since the second paper feed roller 15 is provided on the lever 20 to which the thermal head 17 is attached, when the thermal head 17 is rotated upward, the upper second paper feed roller 15 is lowered. The pressure spring 3 is brought into contact with the lower second paper feed roller.
It is pressurized by 0 and is in a paper feeding state.

During plate making, the motor 24 rotates clockwise in FIG. 4, and the moving table 26 moves leftward. By moving the movable base 26, the cam surface 26b of the movable base 26
It reaches the lower part of the lift through the slope. Therefore, the lever 19 moves downward via the roller 28. When the lever 19 is lowered, the thermal head 17 is pressed against the platen roller 16 by the pressing spring 29.

At the same time, the second paper feed roller 15 is raised by the lever 20, as shown in FIG.
The thermal master 12 is in a free state and is conveyed by the paper discharge roller 18 while being made into a plate.

After plate making, the motor 24 rotates counterclockwise in FIG. 4, and the moving table 26 moves rightward. It passes through the slope of the cam surface 26b of the moving table 26 and reaches a portion with a high lift. Therefore, the lever 19 rises via the roller 28, and the thermal head 17 resists the biasing force of the push spring 29 and moves toward the platen roller 1.
6 and returns to the state shown in FIG.

At this time, the second paper feed roller 15 descends and is pressed against the lower second paper feed roller by the push spring 30, preparing for the next paper feeding state.

(Effects of the invention) As explained in detail above, according to the invention,
The second paper feed roller is attached to the same member as the thermal head so that it operates in the opposite direction to the raising and lowering of the thermal head, so the mechanism is simple and inexpensive, and there is no need for adjustment means, and the operation is reliable. effective.

Furthermore, regarding the paper feeding performance, technical prototype evaluation results have also been shown to improve.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are front views showing an embodiment of a paper feeding device of a plane mimeograph machine according to the present invention,
FIG. 1 is a diagram showing the second paper feed roller before the release operation, and FIG. 2 is a diagram after the release operation. Third
4 are a plan view and a side view showing the second paper feed roller release mechanism section of the apparatus according to the embodiment. FIG. 5 is a front view showing the overall configuration of a plane mimeograph machine to which the paper feeding device according to the present invention is applied. FIG. 6 is a diagram illustrating an example of a release device for the second paper feed roller in the paper feed device of a flat type mimeograph machine. 1...Original table, 2...Original, 3...Glass, 4
...Upper document feed roller, 5...Lower document feed roller, 6...Transport belt, 7...Reading sensor, 8...
...Amplifier, 9...Document ejection roller, 11...Paper feed cassette, 12...Thermal master, 13...Base paper sorting plate, 14...Master first paper feed roller, 15...
Master second paper feed roller, 16... Proten roller, 17... Thermal head, 18... Paper ejection roller, 19... Lever, 20... Lever, 21...
Fulcrum shaft, 22... Machine frame, 23... Board, 24...
Motor, 25... Pinyon gear, 26... Moving table, 28... Roller, 29... Push spring, 30...
...Press spring.

Claims (1)

[Scope of utility model registration request] a thermal head whose base side is pivoted on a fulcrum shaft and whose heat generating part is provided facing the platen roller; an urging means for urging the thermal head in a direction to press the thermal head against the platen roller; A sheet feeder for a flat mimeograph machine, which has a head drive mechanism that rotates about a shaft to raise and lower the heat generating part, and transports the mimeograph paper by a first sheet feed roller, a second sheet feed roller, and a sheet discharge roller. In the device,
On the opposite side of the fulcrum shaft of the thermal head is the second
1. A paper feeding device for a plane mimeographing machine, characterized in that the bearing portions of the paper feeding rollers are connected, and the second paper feeding roller is configured to move in the opposite direction to the vertical movement of the thermal head.