JPH0437743Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rotary shear for a corrugating machine that is incorporated into a corrugated sheet production line.

[Conventional technology and its problems]

As a conventional rotary shear technology with functions for partial and complete cutting of corrugated cardboard sheets,
There is one shown in Publication No. 35431.

As shown in FIG. 8, the rotary shear is provided with a straight knife 21 over the entire width on the outer periphery of a knife cylinder 20, and an elastic body 23 that serves as a receiver for the knife 21 is lined on the outer periphery of an anvil cylinder 22. However, a trapezoidal cutout 24 is formed in a part of the elastic body 23.

In this rotary shear, the cutout 24 formed in the elastic body 23 has a shape that changes in the width direction of the anvil cylinder 22, so that when the knife 21 of the knife cylinder 20 bites into the elastic body 23, the knife 21 relative to the anvil cylinder 22 is The cutting width can be varied by adjusting the phase angle according to the cutting width to be cut.

However, the rotary shear described above has the following disadvantages. In other words, since the knife 21 is straight, when the cardboard sheet is completely cut,
The cut portion becomes a straight line in the width direction of the sheet. Therefore, when the corrugated sheet on the cutting side flows to a new path, if the front ends of the corrugated sheet hit an obstacle such as a sheet guide installed in the sheet transport path due to the meandering of the sheet, the corrugated sheet will It stops and causes a blockage. Furthermore, knife 21
Although the elastic body 23 is easily damaged due to biting into the elastic body 23, and the frequency of replacement of the elastic body 23 due to this damage is much higher than in the case of the knife 21, forming the cutout portion 24 of the elastic body 23 is troublesome. and
It's expensive.

Therefore, this invention solves the above-mentioned inconveniences and allows for complete and partial cutting of corrugated cardboard sheets.Moreover, during complete cutting, the corrugated sheets on the trailing side of the cutting can easily flow smoothly, and furthermore, the anvil The object of the present invention is to provide a rotary shear in which the elastic body of the cylinder can be easily processed.

[Means for solving problems]

In order to achieve the above object, this invention has a knife provided on the outer periphery of the knife cylinder with a length spanning the effective width of the knife cylinder, and at least both ends of the knife are provided with inclined blades that are inclined in opposite directions. The outer periphery of an anvil cylinder facing the knife cylinder is lined with an elastic body having the same width as the effective width that serves as a receiver for the knife, and the length in the circumferential direction of the elastic body is equal to the length of the knife. The dimension was made larger than the length in the circumferential direction.

[Effect]

With the above configuration, by adjusting the phase angle between the anvil cylinder and the knife so that the entire knife bites into the elastic body, the corrugated sheet passed between the knife cylinder and the anvil cylinder can be stretched over its entire width. Can be completely cut.

In addition, by adjusting the phase angle between the anvil cylinder and the knife so that only both ends of the knife bite into the elastic body, it is possible to partially cut both sides of the cardboard sheet passed between the knife cylinder and the anvil cylinder. can.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 7.

As shown in FIGS. 1 and 2, shafts 2 and 2' at both ends of the knife cylinder 1, which is provided opposite to the transport path of the corrugated paperboard sheet S, are connected to a pair of side frames 4 and 4 via bearings 3. Supported. A knife 5 is attached to the outer periphery of the knife cylinder 1 over its entire width. The knife 5 has a straight blade 6 in the center that is parallel to the axis of the knife cylinder 1, and sloped blades 7, 7 that are tilted in opposite directions are provided at both ends of the straight blade 6.

The length l of the straight blade 6 is shorter than the minimum paper width of the corrugated cardboard sheet S.

Further, a clutch 8, a gear 9, and a sprocket 10 are attached to one of the shafts 2 and 2' at both ends of the knife cylinder 1, and the rotation of a line shaft (not shown) is transmitted to the sprocket 10. . The rotation of the indexing motor 11 is connected to the other shaft 2' by a chain sprocket mechanism 12.
and is transmitted via clutch 12'.

An anvil cylinder 13 is arranged below the knife cylinder 1, and the anvil cylinder 1
A shaft 14 provided at both ends of the shaft 3 is supported by the side frames 4 through bearings 15. Furthermore, a clutch 16 and a gear 17 are attached to one of the shafts 14 at both ends of the anvil cylinder 13, and the gear 17 meshes with the gear 9 of the knife cylinder 1. For this reason, knife cylinder 1
When the anvil cylinder 13 rotates due to the drive from the line shaft, the anvil cylinder 13 also rotates in the opposite direction. At this time, the anvil cylinder 13 is configured to rotate at the same speed as the knife cylinder 1.

The outer periphery of this anvil cylinder 13 is lined with an elastic body 18 made of urethane rubber or the like.
The length W of the elastic body 18 in the circumferential direction is larger than the length W of the knife 5 in the circumferential direction.

The rotary shear shown in the embodiment has the above structure, and this rotary shear has clutches 8 and 16.
By this operation, the knife cylinder 1 and the anvil cylinder 13 are rotated, and the corrugated cardboard sheet S passed between the two cylinders 1 and 13 is cut.

In this case, the knife cylinder 1 is stopped with the knife 5 located at the upper part of its outer periphery, and the anvil cylinder 13 is stopped with the elastic body 18 located at the lower part of its outer periphery. When cutting S, the knife cylinder 1 and anvil cylinder 13 are rotated once.

At this time, the clutch 12' is kept in the disengaged state so that the rotation of the knife cylinder 1 is not transmitted to the indexing motor 11.

Further, the phase angle of the knife 5 with respect to the elastic body 18 of the anvil cylinder 13 is adjusted depending on the width dimension of the corrugated paperboard sheet S and whether the corrugated paperboard sheet S is to be completely cut or partially cut.

Note that the index motor 11 may be provided on the anvil cylinder 13 side to adjust the phase angle on the anvil cylinder 13 side.

To adjust the phase angle of the knife 5, the clutch 8 is disengaged, the clutch 12' is engaged, and the indexing motor 11 is driven to rotate the knife cylinder 1 by a predetermined angle from the reference position.

Now, as shown in FIG. 3, by adjusting the phase angle of the knife 5 with respect to the anvil cylinder 13 so that the entire knife 5 bites into the elastic body 18, the corrugated cardboard sheet S is cut as shown in FIG. Thus, the corrugated cardboard sheet S can be completely cut. At this time, both ends of the cutting line are inclined,
Because of the inclination, when the corrugated sheet on the trailing side of cutting flows to a new path, the meandering of the sheet causes both front ends of the corrugated sheet to hit obstacles such as sheet guides installed on both sides of the sheet transport path. When they come into contact with each other, the component of the braking force that attempts to stop the sheet acts to change the direction of the sheet, allowing the trailing corrugated sheet to flow smoothly.

Further, as shown in FIG. 5, both ends of the inclined blade 7 of the knife 5 bite into the elastic body 18, and the straight blade 6
By adjusting the phase angle of the knife 5 with respect to the anvil cylinder 13 so that the knife 5 does not cut into the anvil cylinder 13, it is possible to partially cut both sides of the corrugated cardboard sheet S, as shown in FIG. 30 indicates the cut portion.

Note that, as shown in FIG. 7, by providing a plurality of elastic bodies 18 on the outer periphery of the anvil cylinder 13 with a gap greater than the circumferential length w of the knife 5 between the elastic bodies 18. If one elastic body 18 is damaged, by driving the indexing motor 11 and rotating the anvil cylinder 13, the phase can be changed and a new elastic body 18 can be used as a receiver for the knife 5.
can also be used for a long period of time.

In the case of the embodiment, the straight blade 6 is provided at the center in the length direction of the knife 5, but the straight blade 6 may be omitted. In this case, the knife 5 is inclined in opposite directions from the center in the longitudinal direction toward both ends.

Furthermore, the slopes of the sloped blades 7 at both ends of the knife 5 may be in the opposite directions to those in the above embodiment. Even in this case, the paperboard sheet passing after complete cutting is smoother than the conventional straight cut shape.

In addition, in the case of the embodiment, the knife 5 and the elastic body 1
8 has the same effective width as the maximum width corrugated board sheet S, but each of them may naturally have a length greater than this effective width.

〔effect〕

As described above, according to the rotary shear according to the present invention, when completely cutting, the cutting shape is such that the corrugated paperboard sheet flows smoothly on the trailing side after cutting, so troubles due to clogging are prevented.

Furthermore, the elastic body of the anvil cylinder, which is frequently replaced, is easy to process and costs are low.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the rotary shear according to the invention, Fig. 2 is a perspective view showing the knife cylinder and anvil cylinder as above, Fig. 3 is a plan view showing the corrugated cardboard sheet in a completely cut state, and Fig. 4 5 is a plan view of a fully cut corrugated cardboard sheet, FIG. 5 is a plan view showing a partially cut state of the corrugated cardboard sheet, and FIG.
FIG. 7 is a perspective view showing another embodiment of the same anvil cylinder as above, and FIG. 8 is a perspective view showing a conventional rotary shear. 1...Knife cylinder, 5...Knife, 7...
Inclined blade, 13... Anvil cylinder, 18... Elastic body.

Claims (1)

[Scope of utility model registration request] In a rotary shear, a knife cylinder provided with a knife extending over an effective width on its outer periphery, and an anvil cylinder lined with an elastic body having the same effective width on its outer periphery to receive the knife, are provided opposite to a conveying path of a corrugated cardboard sheet. A rotary shear, characterized in that the knife is provided with inclined blades that are inclined in opposite directions at least at both ends thereof, and the circumferential length of the elastic body is larger than the circumferential length of the knife.