JPS637513Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for cutting a rolled sheet-like web in a direction perpendicular to its longitudinal direction.

Conventionally, as an apparatus for cutting this type of web into a constant size in a direction perpendicular to the flow direction while continuously feeding the web at a constant speed, for example, the present applicant has developed
- There is something provided in No. 58279. The device is
Both lower blades are moved synchronized by the same crank; the upper blade moves in a circular motion, and the lower blade moves in a horizontal reciprocating motion, so that the web to be cut is continuously moved at a constant speed along the upper edge of the lower blade. The web is cut when the upper and lower blades are engaged with each other. Typically, such cuts begin at both ends of the web and end at the center, so the upper blade is sloped higher at the center. Therefore, it takes some time from the beginning of cutting to the end of cutting. In this case, the speed of the horizontal component of the cutting blade must match the flow speed of the web, but the cutting blade is moved by a crank that rotates at a constant angular velocity, and the movement of the horizontal component is a simple harmonic motion. becomes. Therefore, the speed of the horizontal component of the cutting blade is not constant, so even if the speed (horizontal direction) of the cutting blade at the beginning of cutting is adjusted to the flow speed of the web, at the end of cutting, the cutting blade will shift to a position that is forward of the web. .

The situation is shown in FIG. That is, in this figure, the arrow indicates the flow direction of the web W, and when cutting with a straight cutting blade (viewed from a plane) in a direction perpendicular to the flow direction, the cut will be made from the cutting start position a, a to the cutting end position b. Line l will be inclined in the flow direction. Although this cutting line is actually a curved line, it is shown as a straight line in this figure.

The present invention was devised in view of these circumstances, and the cutting line as described above is inclined in the flow direction and produces so-called diamonds, but it is possible to reduce the number of diamonds and cut in a nearly straight line. The present invention provides a cutting device that enables this.

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, to explain the basic idea of the present invention, as described in the conventional cutting example shown in Fig. 1, when cutting a web with a cutting blade without a rake, the cutting blade changes at the end of cutting. Since the position shifts as the web moves forward in the flow direction, and the cutting line l becomes a curve, the cutting blade is preliminarily formed to form a rake (inclined) curve in the opposite direction to the flow direction by the amount of the above shift. If you do this, the cutting line will be a straight line.

In Fig. 2, 1 is a cutting blade (upper blade) that cuts the web from both sides in the width direction in the present invention.
The cutting blade 1 is disassembled into small blocks 1a, 1a and attached to a tool rest by block gauges 2, 2. Thus, the attached cutting blade 1 has a rake that approximates the curve of the cutting line 1 in a direction opposite to the flow direction (arrow) of the web on a plane. The amount of rake is theoretically determined from the web cutting length, cutting width, crank radius, etc. By the way, as already mentioned, the cutting line l by the straight cutting blade is actually a curved line, so it is ideal that the line to rake the cutting blade 1 is also a curved line in the opposite direction to the above curved line, and that curve is It is shown as curve r in Figure 3. However, cutting blade 1
It is extremely difficult to form the cutting blade 1 to match such a curve r, and in the present invention, in order to form the cutting blade 1 on an approximate line close to the curve, the cutting blade 1 is formed by forming the small blocks 1a, 1a to improve the accuracy of each single item, each small block 1a, 1a is arranged along the curve r, and the curve r
The cutting blade 1 is formed by the approximation line. The cutting blade 1 is fixed by placing a block gauge 2 between each block 1a and fixing it with a bolt 3.
A reference surface 5 formed on each of the upper and lower tool rests 4, 4',
5', press the block gauges 2, 2 and bolts 6,
Fix at step 6. The clearance between the upper and lower cutting blades 1, 1' is adjusted by changing the block gauges 2, 2. Furthermore, reference numeral 7 designates an air nozzle provided for the purpose of removing cutting powder etc. from cutting and cooling the cutting blades 1, 1'.

The present invention is as described above, and the cutting blade is formed in a substantially symmetrical direction opposite to the cutting curve l that occurs in the flow direction of the web in a plane when cutting is performed by the cutting blade without a rake. By arranging and fixing a plurality of small blocks 1a along a similar curve r, a rake approximating the curve r is formed in advance on a plane and the cutting line is corrected. For example, the cutting blade during cutting can be synchronized with the flow of the web without requiring a complicated mechanism to change the rotational speed of the crank during cutting, so there is no need to change the drive mechanism of the device. It has the advantage that conventional equipment can be used as is and operations can be performed in the same way. In addition, in forming the rake of the cutting blade, the cutting blade is divided into small blocks and each block is fixed along the rake line, making it extremely easy to manufacture and making corrections or adjustments to each block separately. It is very convenient because it can be done easily.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the diamonds generated in the web by conventional cutting, Fig. 2 is a plan explanatory diagram of the cutting blade in the present invention, Fig. 3 is a detailed explanatory diagram thereof, and Fig. 4 is the main part of the present invention. FIG. 1, 1'... Cutting blade, 1a... Small block of cutting blade, 2... Block gauge, 3, 6... Bolt, 5... Reference surface.

Claims (1)

[Claims for Utility Model Registration] 1. One cutting blade 1 is caused to make circular motion and the other cutting blade 1' is made to make horizontal reciprocating motion by the rotational movement of the same crank, so that ∧ both cutting blades 1 and 1' are In this cutting device, the cutting blades 1 and 1' are configured to mesh with each other and continuously feed the web at a constant speed between the cutting blades 1 and 1' to cut the web into a certain length. A plurality of small blocks 1a are arranged along a substantially similar curve r formed in a direction symmetrically opposite to the cutting curve l that occurs in the flow direction of the web in a plane when cutting with a cutting blade in a state where the web is not cut. A cutting device that forms a rake that approximates the curve r on a plane by fixing the rake. 2 The above-mentioned small blocks 1a, 1a are fixed by using block gauges 2, 2 between each small block 1a, 1a.
The block gauges 2, 2 are pressed against the reference surfaces 5, 5' formed on the upper and lower tool rests 4, 4' and fixed with the bolts 6, 6. The cutting device according to scope 1.