JP2650729B2 - Cutting method of unvulcanized rubber sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention cuts a thin unvulcanized rubber sheet used for forming an air spring, a small tire, etc., particularly smoothly and easily. And a method for cutting an unvulcanized rubber sheet.

(Prior Art) As a conventionally known cutting method for cutting an unvulcanized rubber sheet by a cutting blade which translates with respect to the unvulcanized rubber sheet, for example, there is a method as shown in FIG.

This is because, after the tip of the unvulcanized rubber sheet S horizontally conveyed by the belt conveyor B is positioned beyond the anvil A fixed in the middle of the conveyance path, the unvulcanized rubber sheet S is separated The unvulcanized rubber sheet S is cut into a predetermined size by moving the cutting blade C facing the anvil A horizontally along the groove G provided on the anvil A. According to the method, the unvulcanized rubber sheet S having a thickness of 2 mm or more can be cut smoothly and easily.

(Problems to be Solved by the Invention) However, in the related art, since it is necessary to get over the fixed anvil A by the tip portion of the unvulcanized rubber sheet S, the unvulcanized rubber sheet is In particular, when it is thin, there is a problem that the unvulcanized rubber sheet is easily caught on the groove wall of the anvil A as shown in FIG. Even if such overcoming is successfully performed, the unvulcanized rubber sheet has a low rigidity in the cutting direction and is cut in the cutting direction by the cutting blade C having a thickness of about 10 mm when cutting by the cutting blade C. When subjected to a large external force, the unvulcanized rubber sheet is peeled off from the belt conveyor B and the anvil A as shown in FIG. But there is a problem that does not not proceed at all.

The present invention advantageously solves the above-mentioned problems of the prior art. An unvulcanized rubber sheet that can always be cut smoothly and easily regardless of the thickness and the adhesive strength of the unvulcanized rubber sheet. A method for cutting a vulcanized rubber sheet is provided.

(Means for Solving the Problems) The present invention relates to a method of cutting an unvulcanized rubber sheet into an anvil by cutting the unvulcanized rubber sheet with a cutting blade moving horizontally, obliquely upward or downward, for example. Based on the retracting operation and air blow from there, after hanging down the front of the anvil, the unvulcanized rubber sheet is vacuum-adsorbed to the front of the anvil, and then opposed to the anvil via the unvulcanized rubber sheet Where you want, for example
The unvulcanized rubber sheet is cut by moving a thin cutting blade heated to 200 to 300 ° C. through the unvulcanized rubber sheet.

(Operation) In this cutting method, for example, by lowering the unvulcanized rubber sheet in front of the anvil while retreating, the thickness of the unvulcanized rubber sheet and the magnitude of the adhesive force may be reduced. Without having to, the unvulcanized rubber sheet can always be reliably positioned on the front side of the anvil,
By cutting the unvulcanized rubber sheet with a cutting blade heated to 200 to 300 ° C. in a state of being adsorbed on the anvil, any rubber sheet can be cut regardless of its rigidity. The cutting can be performed very smoothly under a small cutting resistance.

Here, such cutting of the unvulcanized rubber sheet is performed more smoothly when the razor blade of the cutting blade is made as thin as possible.

(Example) Hereinafter, a cutting method of the present invention will be described based on illustrated examples.

FIG. 1 is a diagram illustrating an embodiment of the present invention,
In the figure, 1 is an anvil, 2 is a cylinder for moving the anvil 1 forward and backward, 3 is a knife holder arranged on the front side of the anvil 1, and 4 is detachably attached to the knife holder. Each shows a cutting blade.

In carrying out the present invention by such a device, first,
The anvil 1 is retracted by the action of the cylinder 2 as shown by a solid line in FIG. 2 (a), or provided with a groove 5 in the anvil 1 as shown in FIG. 2 (b). Pressurized air is blown out from small holes 6 of preferably 1φ or less, and then an unvulcanized rubber sheet 7 having a thickness of, for example, about 0.5 mm is hung forward of the anvil 1.

According to this, the lower end of the unvulcanized rubber sheet 7 is
Regardless of its thickness and viscosity, as shown in FIG. 2, it can be reliably and easily passed past the anvil 1 and below it.

After the predetermined amount of the unvulcanized rubber sheet 7 has been protruded below the anvil 1 in this manner, the anvil 1 is caused to advance as shown by a virtual line in FIG. By stopping the ejection of pressurized air from the small hole 6 and then applying a negative pressure to the small hole 6,
The unvulcanized rubber sheet 7 is vacuum-adsorbed to the anvil 1 and held firmly.

Further, the anvil 1 of the unvulcanized rubber sheet 7
The cutting blade 4, which is preferably heated to about 200 to 300 ° C. and preferably has a thickness of 1 mm or less, is heated by the heater 8 housed in the knife holder 3 between the suction positions of the cutting blade 4, for example, as shown in FIG. As shown in the figure, the blade is moved horizontally by the operation of the knife holder 3 so that the blade edge is unvulcanized rubber sheet 7.
The unvulcanized rubber sheet 7 is cut by the cutting blade 4 penetrating into the groove 5 horizontally provided in the anvil 1.

Here, at the time of this cutting, the cutting blade 4 is not only heated but also thin, so that the cutting blade 4 is heated.
The cutting resistance acting on the
The cutting is performed very smoothly without fear of peeling the unvulcanized rubber sheet 7 from the anvil 1.

The cutting blade 4 is attached to the knife holder 3 in such a manner that the cutting edge of the cutting blade 4 is slightly inclined with respect to the unvulcanized rubber sheet 7 in the front-rear direction as shown in FIG. According to this, the unvulcanized rubber sheet 7 can be cut with a small resistance at a part of the blade edge. Further, the attachment of the cutting blade 4 to the knife holder 3 is performed by inserting the cutting blade 4 into a slit provided in the knife holder 3 and by using one or a plurality of push screws 9. By tightening, attachment and detachment of the cutting blade 4 to and from the knife holder 3 can be performed easily and quickly.

Here, in order to appropriately change the cutting angle with respect to the surface of the unvulcanized rubber sheet 7 as required, the knife holder 3 is moved forward and backward with respect to the anvil 1 and, consequently, the unvulcanized rubber sheet 7. Preferably, and in addition to being able to move in the horizontal direction, it is preferable to allow pivoting movement about its axis and movement in the vertical direction. On the other hand, it is also possible to change the cutting angle of the unvulcanized rubber sheet 7 by changing the attachment angle of the cutting blade 4 to the knife holder 3.

After a series of cutting operations is completed in this way, the next cutting operation is continued by repeating the same operation as described above.

As described above, the present invention has been described based on the illustrated device.
In the present invention, not only a thin unvulcanized rubber sheet but also a thick rubber sheet can be easily and smoothly cut, and, as a cutting blade, various existing thin blades other than a razor blade are used. It is also possible to omit the grooves from the anvil.

(Effects of the Invention) Thus, according to the present invention, particularly, the unvulcanized rubber sheet is hung in front of the anvil, and the heated cutting blade is attached to the anvil while the unvulcanized rubber sheet is adsorbed. By moving and cutting the unvulcanized rubber sheet,
Under sufficient holding of the unvulcanized rubber sheet by the anvil, regardless of the thickness of the unvulcanized rubber sheet and the magnitude of the adhesive strength, the unvulcanized rubber sheet is removed under a small cutting resistance. It can be cut very smoothly and easily.

[Brief description of the drawings]

FIG. 1 is a view illustrating an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of hanging an unvulcanized rubber sheet forward of an anvil, and FIGS. 3, 4, and 5 show conventional examples, respectively. FIG. DESCRIPTION OF SYMBOLS 1 ... Anvil, 2 ... Cylinder 3 ... Knife holder 4, ... Cutting blade 6 ... Small hole, 7 ... Unvulcanized rubber sheet 8 ... Heater

Claims (1)

(57) [Claims] A step of hanging the unvulcanized rubber sheet in front of the anvil when cutting the unvulcanized rubber sheet with a cutting blade;
A step of adsorbing the unvulcanized rubber sheet to the anvil, and a step of moving the heated cutting blade to cut the unvulcanized rubber sheet at a position facing the anvil with the unvulcanized rubber sheet therebetween. Cutting method for unvulcanized rubber sheet.