JPS6327157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for a strip-shaped soft material such as cardboard.

Conventionally, this type of device is called a slitter, and as shown in FIG. , 1' are rotated at a speed slightly faster than the transport speed of the material to be cut, and the material to be cut is sandwiched between both blades and sheared.

For this reason, when the material to be cut is a hollow composite paper with a liner paper on the surface and a corrugated core paper on the inside, the area around the cut part deforms due to the compressive action of the knife before the cutting starts. However, since the cutting method is shearing with a thick knife, there is a problem in that the cut ends are crushed, resulting in what is commonly called "crow's footprints."Also, it is necessary to obtain the best possible cut surface when adjusting the gap in areas where the upper and lower cutters overlap. Therefore, strict cutting edge adjustment is required.

To improve these drawbacks, sawtooth etc.1
A cutting device with two rotary blades has been proposed, but in principle it relies on shearing like the two-blade blade described above, so a support member is placed opposite the cutting edge of the rotary blade to support the material to be cut. However, it has the drawback that the cut surface is easily crushed, deformed, and scratched with the receiving material. Furthermore, if the rotation of the rotary blade is accelerated, the damage and deformation of the cutting surface will be improved to some extent, but on the other hand, the blade edge will overheat and become soft due to the heat generated by the friction between the cut material or the receiving material and the blade, which will reduce the sharpness of the blade. It has the drawback of not only damaging it but also accelerating its wear. Further, there is also a problem in that the receiving material also comes into contact with the blade and the material to be cut, causing wear and other damage to both of them.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and includes a disc-shaped cutter having saw-toothed cutting edges of the same pitch on the circumference, supported rotatably up and down in the same plane, and meshing the incisors without contacting each other and rotating the cutter synchronously,
This cutting device is characterized in that it continuously cuts a material to be cut, which is conveyed between two blades, parallel to the flow direction of the material.

The present invention will now be described in detail based on the most preferred embodiment shown in FIGS. 2 and 3. In the figure, an upper rotating shaft 4 and a lower rotating shaft 4' are rotatably supported by a frame via bearings 6, 6' at both ends thereof, respectively. A disk-shaped cutter 3, which has incisors P of the same pitch on the circumference, is attached to the rotating shafts 4, 4' by means of fixing jigs 5, 5' with bolts or the like.
3' is attached. The cutting teeth P are provided all around the blades 3, 3', but are partially omitted in FIG. 2, and the omitted portions are indicated by dashed lines.
Furthermore, as shown in FIG. 3, the cutters 3 and 3' are arranged in the same plane, without contacting each other, and with the peaks and troughs of the incisor teeth P interlocking with each other.

Since the upper and lower cutters 3, 3' must be rotated while meshing with each other, they must be designed so that the cutting teeth P do not interfere with each other during rotation. For example, cutting P
It is better to make the pitch larger and the tooth height higher if possible to avoid interference.

Further, in case of interference, a relief may be provided in the blade portion.

In order to rotate the blades 3, 3' synchronously, gears 7, 8 are fitted on a part of the rotating shafts 4, 4'.
There is also a gear 9 disposed so as to mesh with the gear 8, and the gear 9 is connected to a drive motor 1 equipped with an accelerating/decelerating device.
Connected to 0. Further, rolls 12 are arranged to support and guide the material 11 to be cut.

Next, the operation of this device will be explained. As the gear 9 fitted to the main shaft connected to the drive motor 10 rotates, the gears 8 and 7 rotate in opposite directions to transmit rotational torque to the rotation shafts 4 and 4'. The blades 3 and 3' attached to the shaft rotate together with the blade 4' while meshing with each other.

Next, as shown in FIG. 3, the material to be cut 11 is continuously transferred in the direction of the arrow by a transfer device (not shown) and introduced into the meshing portion of the blades 3 and 3', so that the upper surface of the material to be cut 11 is The cutter is cut from both sides simultaneously, primarily by the upper cutter 3, and the lower surface by the lower cutter 3'.

The cutting mode depends on the thickness of the material to be cut 11 and the blade 3.
3', and if the former is larger than the latter, the upper cutter 3 will overlap the workpiece 11.
Also, since the cutter 31 does not reach the upper surface of the material to be cut 11, the upper part of the material to be cut 11 is cut by the upper cutter 3, and the lower part by the lower cutter 3'.

Further, when the former is smaller than the latter, the cutting form differs depending on the relative speed between the transport speed of the material to be cut 11 and the rotational speed Vc of the blades 3, 3'.

That is, when both speeds Vs and Vc are approximately equal, the cutting teeth P of the blades 3 and 3' pierce the upper and lower surfaces of the material 11 to cut the material 11 at different angles.

Further, when the rotational speed Vc is higher than the transfer speed Vs, cutting is performed alternately by the incisors of the leading blade among the blades 3 and 3'.

According to the present invention, in any cutting mode, the material to be cut is sandwiched between the disc-shaped blades arranged above and below, and the cutting resistance applied to each blade can be balanced. Since the object acts both as a cutting blade and as a support material for the other blade at the same time, a support material is not needed, and clean cuts can be made without crushing the cut surface. Particularly favorable results can be obtained when applied to a cardboard cutting device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a schematic configuration of a conventional cutting device, FIGS. 2 and 3 are explanatory diagrams showing a cutting device according to an embodiment of the present invention, and FIG. FIG. 3 is a cross-sectional view of FIG. 3,3'... cutlery, P... incisor.

Claims (1)

[Claims] 1. A disk-shaped cutter having serrated cutting edges of the same pitch on its circumference is supported so as to be rotatable up and down in the same plane, and the cutters are meshed without contacting each other, and the cutter is A cutting device that rotates synchronously and continuously cuts a material to be cut that is conveyed between two blades parallel to the flow direction of the material.