JPS6140480Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary clipper that has an anvil roll between an upstream conveyor and a downstream conveyor, and is capable of cutting thin sheets at high speed on the anvil roll. be.

The present invention uses this kind of rotary clipper to cut a thin sheet-like material 7, such as a veneer, paper, cloth, etc. By preventing wrapping, the rotary clipper can cut the sheet material 7 at high speed, which is the original purpose of the clipper.

Originally, a rotary clipper rotates a cutter roll 5 equipped with a knife 4 in synchronization with the sheet-like object 7 being conveyed.
This was intended to improve productivity, yield, etc. by cutting without stopping, but when the sheet material 7 to be cut is thin, a problem occurs on the back side of the knife 4 as the cutter roll rotates during cutting. Because the wind pressure acts on the negative side due to the turbulence, the sheet-like material 7 that is continuously conveyed to be cut next
The tip of the knife 4 is sucked up to the back side of the knife 4, and is also wound around the cutter roll 5 surface due to the rotation of the cutter roll 5. Therefore, the operation may be stopped to remove the wrapped sheet material 7, or the sheet material 7 may be cut at low speed to weaken the negative effect of wind pressure due to turbulence generated on the back side of the knife 4. Alternatively, countermeasures had to be taken, such as using it only for cutting thick sheet materials 7. For this reason, there have been problems such as a decrease in work efficiency, a decrease in yield, and the fact that the sheet-like material 7 to be cut is limited to thick ones.

However, a paper cutting device as disclosed in Utility Model Publication No. 12-16483 in which a cutting blade is held between rubber protective stripes and the cutting blade is always projected from the protective stripes is known. (Former) In addition, as in Utility Model Publication No. 32-14306, an operating arm placed upstream of the cutting blade protrudes and cuts the paper immediately after cutting the paper, and hits the leading edge of the paper to prevent it from wrapping around the paper. The device also belongs to the known art. (Latter) However, in the former case, since the cutting blade always protrudes from the protective strip, the protective strip only comes into contact with the paper just before the cutting blade cuts, and although it prevents the paper from fluttering, it It does not have a stretching effect. The paper is therefore cut without regard to the protective strips. In this way, the cutting edges are often compromised because the protective strips are unable to provide tension to the paper.

Further, in the latter case, since the operating arm protrudes immediately after the cutting blade cuts, no tension is applied to the paper before cutting, and the paper does not have the function of smoothing the cutting. Just knock off the cut end of the paper,
It only prevents the wrapping.

[Means for solving problems and their effects]

The rotary clipper of the present invention has the following configuration in order to solve the problems of the above-mentioned conventional cutting devices of this type. That is, an anvil roll 3 is provided between the upstream conveyor 1 and the downstream conveyor 2, and the anvil roll 3
A cutter roll 5 equipped with a knife 4 is provided on the top,
In a rotary clipper that rotates an anvil roll 3 and a cutter roll 5 to cut a sheet material 7 conveyed by an arbitrary conveyance device on the anvil roll, a cutter roll 5 equipped with a knife 4 has a knife 4 on the back side upstream of the knife 4.
It is provided with a semicircular strip spring 6 protruding from the tip, and one end of this semicircular shape is fixed along the upstream back side of the knife 4, and the other end is pressed against the circumferential surface of the cutter roll 5 as a free end. This is what I did.

The rotary clipper of the present invention has the above-mentioned configuration, so that the spring 6 is activated by the sheet-like material 7 supported by the anvil roll 3 and the upstream conveyor 1 immediately before the knife 4 cuts the sheet-like material 7. Pressed upward, the sheet-like material 7
After cutting, the spring 6 operates to strike the tip of the cut sheet 7 in order to return it to its original state, the pressed state is released, and the knife 4 protrudes again from the tip. .

Therefore, the spring 6 of the rotary clipper of this invention has two functions: just before cutting, it is pressed against the sheet-like material 7 between the anvil roll 3 and the upstream transport conveyor 1, causing it to become depressed, applying tension to it and making it easier for the knife 4 to cut, and just after cutting, it strikes the leading edge of the cut sheet-like material 7 to prevent it from wrapping around itself.

The present invention will be explained below based on the embodiments shown in the accompanying drawings.

A cutter roll 5 is provided with a transport device including an upstream transport conveyor 1 and a downstream transport conveyor 2 in the front and back, and has a knife 4 on an anvil roll 3.
will be established.

The cutter roll 5 protrudes from the circumferential surface of the cutter roll 5 on the back side of the knife, and is provided with a band-shaped spring 6 in a semicircular shape. One end of the spring 6 is fixed to the back surface of the upstream side of the knife 4, and the other end is a free end. Then, the anvil roll 3 and cutter roll 5 are rotated relative to each other to cut the sheet material 7 conveyed onto the anvil roll 3. Sheet materials 7 such as veneers, paper, cloth, plastic films, sheets, etc. are transported by the upstream transport conveyor 1.
The tip of the sheet-like material 7 placed on the anvil roll 3 rotating at the same speed as or faster than the conveyance speed, and placed on the downstream conveyor 2 is detected by an appropriate detection device, and the anvil roll 3
The cutter roll 5 is rotated in synchronization with the drive of the
The sheet-like material 7 is cut by the knife 4.

The cutter roll 5 may have a fixed length determined by its rotation speed, and may be continuously rotated to continuously cut the sheet material 7.

The cutter roll 5 is equipped with a knife 4, one end is fixed to the cutter roll 5 surface on the back side upstream of the knife 4, the other end is in a free state, and a band-shaped spring 6 is attached so as to have a semicircular shape. Provide multiple units in each direction. The spring 6 has its semicircular circumferential surface tip somewhat protruding from the tip of the knife 4.

The operating state of the spring 6 is shown in FIGS. 3A to 3D.

In FIG. 3A, the sheet-like material 7 is in a state just before being cut, and the spring 6 and knife 4 are still attached to the sheet-like material 7.
is not in contact with

FIG. 3B shows a state in which the sheet-like material 7 is being cut by the knife 4, and at this time, the spring 6 comes into contact with the sheet-like material 7 before the knife 4 cuts the sheet-like material 7.

As a result, the free end of the spring 6 retreats,
The top of the semicircular shape is concave.

At this time, the sheet-like material 7 has not yet been completely cut, and the anvil roll 3 is also in a stretched state due to the tensile force of the downstream conveyor 2 and the pushing force of the upstream conveyor 1. For this reason, spring 6
is pushed upward by this expansion tension and becomes in a contracted state.

As a result, the spring applies tension to the sheet material 7 between the anvil roll 3 and the upstream conveyor 1 before the knife 4 cuts it.

In FIG. 3C, cutting of the sheet-like material 7 is completed, the knife 4 is separated from the sheet-like material 7, and only the spring 6 is in contact with the sheet-like material 7. In this state, the cut end of the sheet-like material 7 is supported by the upstream conveyor 1 and the anvil roll 3. The spring 6 is connected to the upstream conveyor 1,
Although it is pressed between the anvil rolls 3, the sheet-like material 7 is cut and becomes a free end, so the spring, which had been compressed in the state shown in FIG. 3B, returns to its original state as shown in FIG. 3C'. Go back and hit the tip of the sheet-like material 7 so as to push it down somewhat.

The states c and c' in FIG. 3 change instantaneously, so they are displayed at the same position.

In this way, the force with which the tip of the sheet-like material 7 tries to wrap around the cutter roll 5 is reduced.

FIG. 3D shows a state in which the leading end of the sheet-like material 7 passes through the cutter roll 5 and the sheet-like material 7 is smoothly transferred.

After cutting in this way, as the cutter roll 5 rotates, the spring 6 returns to its original state due to its repulsive force. The repulsive force hits the tip of the sheet-like material 7, and if the tip of the sheet-like material 7 hits the knife 4,
Even when a force is applied to the back surface side, the material gets on the downstream conveyor 2 due to the knocking down action of the spring 6.

Then, the semicircular top of the spring 6 again protrudes from the tip of the knife.

The best condition is to attach the spring 6 to the entire widthwise surface of the knife 4, but the spring 6
Since the knock-off effect is strong, the effect can be fully demonstrated by installing several pieces at appropriate locations.

Further, since the sheet material 7 is cut while the insertion side is held down by the spring 6, the sheet-like material 7 is not pulled toward the delivery side during cutting, and cutting accuracy is improved.

[Effect of the invention] With the spring 6 holding down the insertion side of the sheet-like material 7, that is, when cutting the sheet-like material 7, the tension is reduced between the anvil roll 3 and the upstream conveyor 1. Therefore, the cutting accuracy of the sheet-like material 7 is improved.

In addition to the function of applying tension to the sheet-like material 7, the spring 6 also has a function of hitting the tip of the cut sheet-like material 7 to prevent it from wrapping.

Therefore, the spring 6 has the above-mentioned two functions, and the structure as a whole becomes simple.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a partial sectional view of the cutter roll in Fig. 1,
FIGS. 3A, 3B, 3C, 3D, and 3C are cross-sectional views showing the cutting operation by the cutter roll. 1...Upstream conveyor, 2...Downstream conveyor, 3...Anvil roll, 4...Knife, 5...Cutter roll, 6...Spring, 7...Sheet-like material.

Claims (1)

[Claims for Utility Model Registration] An anvil roll 3 is provided between the upstream conveyor 1 and the downstream conveyor 2, and a cutter roll 5 equipped with a knife 4 is provided on the anvil roll 3. In a rotary clipper that rotates cutter rolls 5 relative to each other and cuts a sheet material 7 conveyed by an arbitrary conveyance device on an anvil roll, a knife 4
The cutter roll 5 is equipped with a semicircular strip spring 6 protruding from the tip of the knife 4 on the upstream back side of the knife 4, and one end of this semicircular shape is fixed along the upstream back side of the knife 4, and the other end is free. The end of the spring 6 is pressed against the circumferential surface of the cutter roll 5, and the spring 6 is pressed upward by the sheet 7 supported by the anvil roll 3 and the upstream conveyor 1 just before the knife 4 cuts the sheet 7. After cutting the sheet-like material 7, the spring 6 operates to strike the tip of the cut sheet-like material 7 to return to its original state, and the pressed state is released and the knife 4 protrudes again from the tip. A rotary clipper configured as follows.