JP2689782B2 - Paper clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper clamp device which is provided, for example, in a paper carrying section of a printing device and which nips and carries cut paper.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing an open state of a paper clamping device of a conventional printing device disclosed in, for example, Japanese Patent Laid-Open No. 63-199667, and FIG. It is a side view which shows the state which was done. In the figure, reference numeral 1 is a clamper, which comprises a rod-shaped snap 2 provided at the tip of a band-shaped elastic member and a socket member 3 having a recess into which the snap 2 is fitted. The clamper 1 is closed by its elasticity. It is like this. Reference numeral 4 is a sheet, and 5 is a belt that conveys the clamper 1.

In the conventional paper clamp device as described above, the snap 2 is opened from the socket member 3 and the paper 4 is inserted into the snap 2 by the opening / closing mechanism (not shown). After that, the snap 2 is fitted into the socket member 3 by the opening / closing mechanism, and the end portion of the sheet 4 is clamped. After printing is completed, the snap 2 is opened from the socket member 3 by the opening / closing mechanism and the paper 4 is taken out.

In particular, in a thermal transfer color printing apparatus, in order to print a desired color by performing printing on the same sheet a plurality of times, the clamping force of the clamper 1 is increased so that the clamping of the sheet 4 does not move during printing. It is necessary to adopt the above snap structure or the like.

[0005]

In the conventional paper clamp device configured as described above, the clamping force of the clamper 1 fluctuates due to variations in the thickness of the paper 4, and when it is too thick, the paper cannot be clamped. In addition, the paper 4 with high rigidity (for example, O
In the case of a transparent sheet for PH, etc., the curved portion A where the sheet 4 extends from the sandwiching portion of the socket member 3 along the belt 5 is pressed and reduced with each printing operation, so that color misregistration occurs. Ma
Also, the paper 4 is surely snapped onto the socket member 3
It is necessary to press down the snap 2 in order to hold it.
As a result, a strong force is applied to the belt 5 and the belt 5 stretches unnecessarily.
Reduce the accuracy of sheet conveyance and shorten the life of the belt 5.
There was a problem such as .

The present invention has been made in order to solve the above problems, and has a pressing force for gripping the sheet 4.
On the other hand, it is an object of the present invention to provide a paper clamp device in which the belt 5 does not extend unnecessarily .

[0007]

[0008]

SUMMARY OF THE INVENTION According to a first aspect of the present invention, there is provided a sheet clamp device in which a clamp bar carried by a pair of belts and a direction in which a clamp arm for sandwiching a sheet between the clamp bars is closed. a biasing means for biasing the lever to open the clamp arm acting as a a lever by one end freely clamp arm and the pivot is pressed <br/> other end attached, the paper A back plate that supports the pressing force of the lever by abutting the belt by a slight extension when the lever is pressed at the time of attachment / detachment .

[0009]

In the first aspect of the present invention, the lever is pushed.
Sometimes the back plate, which the clamp bar abuts, is the lever
Support the pressing force of.

[0010]

[0011]

【Example】

Embodiment 1 FIG. 1 is a side view of a schematic mechanism of a printing apparatus showing an embodiment of the present invention, FIG. 2 is a perspective view of a paper clamping apparatus of an embodiment of the present invention, and FIGS. 3 and 4 are lines II-- of FIG.
FIG. 4 is a cross-sectional view taken along line II, FIG. 3 is a state in which the clamper is opened, and FIG. 4 is a diagram in which the clamper is closed. In the figure, 4 and 5 are the same as those described in the conventional example. A first pulley 6 is provided in a pair on both ends of the platen coaxially with a platen (not shown), and a pair of belts 5 are hung on the platen. 7 is the second pulley,
The belt 5 is stretched with a third pulley (not shown). Reference numeral 8 is a pinch roller which is provided so as to be able to come into contact with and separate from the platen, 9 is a paver guide which is a supply path of the paper 4, and 10 is a cam. Reference numeral 11 is a clamper installed between the belts 5 and is rotated together with the belt 5 by the rotation of the pulley. 12
Is a back plate, and the cam of the trajectory of the clamper 11
The clamper 11 and the back plate 12 are normally provided at positions where they do not contact with each other in opposition to the passage of the clamper 11 closest to 10.

Numeral 13 is a clamp bar extending in the width direction of the sheet 4, both ends of which are attached to the belt 5. Reference numeral 14 denotes a clamp arm whose base end is rotatably attached to a clamp bar 13 via a shaft 15, and a sheet 4 (FIG. 4) is sandwiched between the clamp arm 14 and the clamp bar 13. . A rubber 16 is provided as a friction member on the contact portion of the clamp arm 14 with the sheet 4. Reference numeral 17 is a spring provided on the shaft 15 as a biasing means for biasing the clamp arm 14 in the closing direction, and 18 is rotatably attached to the action portion 14a of the clamp arm 14 and one end thereof is moved along the clamp bar 13. The lever 18 is a free lever, and the other end of the lever 18 is pressed by the cam 10 in the direction of the arrow in FIG. 4 to act as a lever to open the clamp arm 14. In addition, a roller 19 is provided at a contact portion of the lever 18 with the clamp bar 13 in order to smoothly move the lever 18 with respect to the clamp bar 13. Clamper
11 is the clamp bar 13 and the clamp arm 1 as described above.
It is composed of 4, shaft 15, rubber 16, spring 17, lever 18, and roller 19.

In the paper clamp device constructed as described above, the clamper is provided between the back plate 12 and the cam 10.
11 is stopped and the cam 10 is moved in the direction shown by the arrow in FIG.
When the other end of the lever 18 is pressed by the lever 18, the lever 18 rotates around the acting portion 14a in the clockwise direction in the drawing. As a result, the roller 19 rolls on the clamp bar 13 to the left in the figure, and the lever 18 acts as a lever to lift the acting portion 14a, so that the clamp arm 14 opens against the spring 17 as shown in FIG. To be done. In this state, when the paper 4 is inserted between the clamp bar 13 and the clamp arm 14 and then the pressure on the lever 18 is released, the restoring force of the spring 17 closes the clamp arm 14 and the lever 18 moves counterclockwise. It turns to the state shown in FIG. And clamp bar 13 and rubber 16
The sheet 4 is clamped by the urging force of the spring 17 between them.

As described above, the spring 17 having a predetermined biasing force.
The clamp arm 14 is directly urged by the
It is possible to securely clamp with sufficient force while keeping the flat surface. Further, when the clamp arm 14 is closed, the lever 18 does not exert a force on the clamp arm 14 and the lever 18 is a floating mechanism, so that the load of the clamp arm 14 can be applied uniformly to the paper 4. You can Further, since the lever 18 works as a lever to open and close the clamp arm 14, the opening and closing is smooth. Further, since the roller 19 is provided at the contact portion of the lever 18 with the clamp bar 13, the load at the time of operation of the lever 18 can be reduced, and the opening and closing becomes smoother.

Further, since the clamping bar 13 is its ends is attached to the belt 5, the other end of the lever 18 by the rotation of the cam 10 is pressed, extend the belt 5 slightly, clamp bar 13 It abuts the back plate 12 and receives a pressing force to ensure the opening of the clamp arm 14. Further, the clamp component 13 stops the movement of the clamp bar 13 in the direction of the arrow B in FIG. 1 due to the rotational component of the cam 10 to eliminate the displacement of the insertion position of the sheet 4. Even if the biasing force of the spring 17 is increased in this way, the belt 5 is not supported due to the support of the back plate 12.
It is possible to ensure the opening of the clamp arm 14 without applying the necessary elongation and burden .

In order to reliably prevent the clamp bar 13 from moving in the direction of the arrow B due to the rotational component of the cam 10 of the back plate 12, the contact surface of the back plate 12 with the clamp bar 13 has a large friction coefficient. If a coating layer 12a made of a material (for example, polyurethane) is provided, the clamp bar 13
Can be reliably prevented from moving.

[0017]

As described above, in the present invention, the paper
When the lever is pressed when attaching or detaching the
With a back plate that abuts and supports the pressing force of the lever
The back plate supports the pressing force of the lever.
Since the belt does not need unnecessary stretching, paper can be transported.
The accuracy can be maintained and the life of the belt can be prevented from being shortened.
It has a clear effect.

[Brief description of the drawings]

FIG. 1 is a side view of a schematic mechanism of a printing apparatus showing an embodiment of the present invention.

FIG. 2 is a perspective view of a paper clamp device according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line II-II in FIG. 2, showing a state in which the clamper is opened.

FIG. 4 is a cross-sectional view taken along line II-II in FIG. 2, showing a state in which the clamper is closed.

FIG. 5 is a side view showing an open state of a paper clamp device of a conventional printing device.

FIG. 6 is a side view showing a state in which a sheet is clamped in a sheet clamp device of a conventional printing apparatus.

[Explanation of symbols]

 4 Paper 5 Belt 10 Cam 11 Cramber 12 Back plate 13 Clamp bar 14 Clamp arm 15 Shaft 16 Rubber 17 Spring as biasing means 18 Lever 19 Roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Yoshida 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (56) Reference JP-A-2-305668 (JP, A) JP-A-2-181998 (JP, A) JP-A-3-14411 (JP, A)

Claims (1)

(57) [Claims] 1. A clamp bar carried by a pair of belts, a clamp arm attached to the clamp bar for holding a sheet between the clamp bar, and a biasing force for biasing the clamp arm in a closing direction. Means, a lever for rotatably attaching one end to the clamp arm and pressing the other end to act as a lever to open the clamp arm, and a sheet of paper that normally does not contact the clamp bar . A sheet clamp device, comprising: a back plate that abuts against the extension of the belt when the lever is pressed during attachment / detachment to support the pressing force of the lever.