JPS5939034Y2 - Slitter - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a device for cutting paper into a predetermined width, that is, a slitter.

(Conventional technology) FIG. 1 shows an example of a conventional slitter.

1 is a lower cutting force, which is fixed to a shaft 2 and rotated in the direction of arrow A.

Reference numeral 3 denotes an upper cutting blade, which is fixed to a shaft 4 and rotated in the direction of arrow B.

Both cutting blades 1 and 3 each have cutting edges on their circumferential edges, and act as scissors by pressing their sides against each other.

The shaft 4 is rotatably supported at both ends by bearings 5a and 5b.

The bearings 5a and 5b are 1. By a frame not shown,
It is supported so as to be movable in the vertical direction, that is, in the direction of arrow C, and is urged downward by springs 6a and 6b.

? a and γb are eccentric cams fixed to the shaft 8, and support cam follower pieces 9a and 9b fixed to bearings 5a and 5b.

Therefore, the spring 6a acting on the bearings 5a, 5b,
The biasing force of 6b is stopped by eccentric cams 7a, 7b via cam driven pieces 9a, 9b, and the shaft 4 and upper cutting blade 3 are held at the position shown by the solid line in the figure.

When the paper 10 to be cut is fed from the back toward the front by a conveying device (not shown), it is sheared by the two cutting blades 1 and 3 as shown in FIG. 2A.

When cutting is not necessary, rotating the eccentric cams 7a and 7b causes the cam driven pieces 9a and 9b to
is pulled up, causing the shaft 4 to move upward as shown by the chain line.

As a result, the upper cutting blade 3. It disengages from the lower cutting force 1 and moves upward, allowing the paper 10 to pass between the two cutting blades 1 and 3 without being cut.

By the way, when paper that requires the cutting capacity of one double-sided cutting blade 1.3 is fed in, for example, several sheets of paper 10' overlapped as shown in FIG. 2, the upper cutting blade 3 The paper 1 is lifted up against the biasing force of the springs 6a and 6b.
0' is passed through without being cut.

When the paper 10' passes, the upper cutting blade 3 releases the spring 6a.
, 6b, the cutting blades 1 and 3 descend again, but since the sides of the cutting blades 1 and 3 are in pressure contact with each other, while their engagement is prevented, the cutting blades move sideways due to the pressure force. , even if the upper cutting blade 3 descends again, a misalignment occurs as shown in FIG. 2C.

Therefore, it is necessary to return this to the normal meshing state shown in FIG.

However, when overcoming this, an excessive force is applied to the cutting edges of both cutting blades 1 and 3, resulting in damage to the cutting edges.

(Purpose) The present invention aims to solve the above-mentioned problem, that is, to prevent damage to the cutting edge due to collision between the cutting edges.

(Structure) In order to achieve the above object, the present invention includes two rotating cutting blades that are in mesh with each other, and the distance between the axes of the two rotating cutting blades can be expanded against the biasing force of a spring. In the slitter, the slitter is configured such that the side surface of one cutting edge of the double-rotating cutting blade is pressed against the side surface of the other cutting edge, without fixing the axial position of the other rotating cutting blade. The present invention is characterized in that the pressure contact force is regulated by a stopper, and the pressure contact force transmitted from the one rotary cutting blade to the other rotary cutting blade is stopped by the stopper.

Hereinafter, the bar of the present invention will be explained in detail based on an embodiment.

The lower cutting force is fixed to a boss 11, and the boss 11 is slidably fitted onto the shaft 2.

The rotation of the shaft 2 is transmitted to the boss 11 by a key and a keyway 12.

The lower cutting force 1 is pressed against a stopper 15 fixed to the shaft 2 as shown by the arrow by the weak force of a spring 14 compressed between it and a collar 13 fixed to the shaft 2, and is thereby fixed. held in position.

The upper cutting blade 3 is fixed to a boss 16, and the boss 16 is slidably fitted onto the shaft 4.

The rotation of the shaft 4 is transmitted to the boss 16 by a key and a keyway 17.

Bearings 5a and 5b that rotatably support the shaft 4 are supported by a frame (not shown) so as to be movable up and down, that is, in the direction of arrow C, and their up and down positions are relative to the cam follower piece 9a.
, 9b and are regulated by cams 7a, 7b.

The bearings 5a and 5b are urged downward by springs 6a and 6b.

cam? a and 7b are fixed to a shaft 8 via bosses 18a and 18b, and the shaft 8 is rotatably supported by a frame (not shown).

An end cam 19 is fixed to the shaft 8, and a cam follower 20 is in contact with the cam surface.

The cam follower 20 is loosely fitted onto the shaft 8 and is capable of axial movement, button movement, and rotation with respect to the shaft 8 .

The cam follower 20 and the collar 21 fixed to the shaft 8
The spring 22 compressed between the end cam 1
It is biased toward 9.

Reference numeral 23 denotes a fork fixed to the cam follower 20, and its bifurcated portion is connected to the annular groove 2 provided in the boss 16 of the upper cutting blade 3.
4 is engaged.

Next, the operation of the device will be explained.

3 and 5 show the cutting operation in progress, with the shaft 4 and the upper cutting blade 3 in a lowered state.

That is, the shaft 4 is in the lower position for a long time allowed by the cams γa and 7b due to the force of the springs 6a and 6b, and the cutting edge of the upper cutting blade 3 is engaged with the cutting edge of the lower cutting force 1.

The side surface of the cutting edge of the upper cutting blade 3 is pressed against the side surface of the cutting edge of the lower cutting force 1 by the force of the spring 22 transmitted through the fork 23.

When the paper 10 is conveyed from the back of the figure toward the front, it is cut as it passes through the meshing portion of the two rotating cutting blades 1.3.

If the paper 10 is not to be cut, the shaft 8 is rotated approximately 90', as indicated by arrow E, into the inoperative state.

As a result, the cams 7a and 7b raise the shaft 4 in the direction of the arrow C1 via the cam follower piece 9at9bk, as shown in FIG.
Raise the upper cutting blade 3.

On the other hand, since the fork 23 engages with the boss 16 of the upper cutting blade 3, the cam follower 20 does not rotate despite the rotation of the shaft 8, and the end cam 19 rotates together with the shaft 8.

Therefore, the cam follower 20 is driven by the end cam 19 in the direction of arrow F, and the upper cutting blade 3
are moved in the same direction to release the pressure contact with the lower cutting force 1.

Eventually, the upper cutting blade 3 moves obliquely upward, that is, in the direction of arrow G, as shown by the chain line in FIG. 6, and disengages from the lower cutting force 1.

Therefore, one sheet of paper 10 can pass through without being cut.

If the transported paper 10' is uncuttable as shown in Figure 2, the upper cutting blade 3 is cut as shown in Figure 2.
rises against the urging force of springs 6a and 6b, and paper 1
0' and after passing the paper 10',
The misalignment as shown in FIG. 2C is the same as in the prior art.

In order to return this misaligned state to the normal engagement L state shown in Fig. 2a, first rotate the shaft 8 by 90° in the direction of the arrow from the operating state shown in Figs. 3 and 5. 4-
put it into working condition.

As a result, it moves in the direction of arrow G, as shown in the upper cut.

The cutting edge of the upper cutting blade 3 pushes the cutting edge of the lower cutting force 1 in the direction of arrow F, but the lower cutting force 1 is not fixed to the shaft 2 and is pushed against the stopper 15 by the weak spring 14. The lower cutting force 1 retreats in the direction of arrow F.

Then, by the time the upper cutting blade 3 reaches the diagonally upward position shown by the chain line, it returns to the opposite direction of the arrow F by the force of the spring 14,
It comes into contact with the stopper 15 and returns to the normal position.

Next, when the shaft 8 is reversely rotated to return to the operating state shown in FIG. 3, the upper cutting blade 3 returns in the opposite direction of the arrow G and returns to its normal meshing state against the lower cutting force 1.

In the above embodiment, the upper cutting blade 3 is provided with an axial biasing force for engagement, and is also movable in the vertical direction. The lower cutting force 1 may be retracted by only applying a biasing force in the direction, and the cutting force 1 may be moved in the vertical direction.

That is, the distance between the axes of both cutting blades may be changed by making either one movable or by making both one movable.

They may also be placed upside down or placed side by side.

Furthermore, the present invention can also be implemented for the purpose of making perforations without cutting the paper by making one cutting edge of the cutting blade into a looplet shape.

That is, the slitter used in the present invention is defined as including a perforation forming device in addition to the original hotbed slit.

(Effects) As described above, the present invention provides a pair of rotary cutting blades (upper cutting blade 3 in the embodiment) with which (one) of the two rotating cutting blades is applied with an axial pressing force for engagement. (other)
The axial position of the rotating cutting blade (lower cutting force 1 in the example) is not fixed, but is regulated by a stopper, so that in the normal meshing state, the pressure contact force for meshing is stopped by the stopper, and the other The axial position of the rotating cutting blade can be maintained accurately.

In the misaligned state shown in FIG. 2C, no pressure force is applied to the other rotating cutting blade, so it can move freely away from the stopper.
When returning from a misaligned state to a normal meshing state, it can be temporarily retracted, and the blade edges of the bi-rotating cutting blades do not collide, thereby preventing damage to the blade edges.

In addition, as shown in the embodiment, if the other rotating cutting blade is pressed against the stopper by a spring, the distance between the axes of both rotating cutting blades can be temporarily increased in order to return the misaligned state to the normal meshing state. Operation 75 of returning the other rotary cutting blade from the temporarily retracted position to the normal position where it contacts the stopper can be performed dynamically.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional slicer, and FIG. 2 is a front view of the cutting edge portion. Figure 3 and the following diagrams show an embodiment of the present invention.
5 and 4 are front views, FIG. 5 is a perspective view, and FIGS. 6 and 7 are front views showing the engagement state of the upper and lower cutting blades. 1...Lower cutting force, 3...Upper cutting blade, 6a
, 6b...Spring, 14...Spring, 15...Stopper, 22...
·spring.

Claims (2)

[Scope of utility model registration request] (1) Two rotary cutting blades that are in mesh with each other, the distance between the axes of the two rotating cutting blades can be expanded against the biasing force of a spring, and the double rotating cutting blade The slitter is pressed so that the side surface of one cutting edge of the blade is pressed against the side surface of the other cutting edge, and the axial position of the other rotary cutting blade is regulated by a stopper without being fixed. Slipper 0 characterized in that the pressure contact force transmitted from one rotary cutting blade to the other rotary cutting blade is stopped by the stopper. (2) Slipper 0 according to claim 1 of the utility model registration claim, characterized in that the other rotary cutting blade is pressed against the stopper by a spring.