JPH0347850Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutting device for an unvulcanized rubber sheet. More specifically, the present invention provides an unvulcanized rubber sheet that can cut a wide and long preformed unvulcanized rubber sheet such as a waterproof rubber sheet along a predetermined cutting position line with high dimensional accuracy. This invention relates to a cutting device for sheet-like materials.

[Prior Art] Generally, a rubber sheet is manufactured by preforming a long unvulcanized rubber sheet using unvulcanized rubber, and then continuously vulcanizing the sheet in a high-temperature vulcanization device.

On the other hand, among special-purpose rubber sheets with high precision dimensions, long unvulcanized rubber sheets are created, cut into predetermined short dimensions, and then cut into short unvulcanized rubber sheets. The method used is to vulcanize a rubber sheet.

In cutting these short unvulcanized rubber sheets, it is necessary to be able to cut along the predetermined cutting position line and in the thickness direction with high dimensional accuracy, and also to have no unevenness or overheating burnout on the cut surface. be done.

Now, unvulcanized rubber sheets are inherently plastic and sticky. For this reason, when an unvulcanized rubber sheet is cut with a cutter knife, etc., the unvulcanized rubber sticks to the cutter knife surface, worsening the blade release properties, and causing wrinkles and unevenness on the cut surface, resulting in cutting. There are drawbacks such as reduced work efficiency and difficulty in cutting with high dimensional accuracy.

Therefore, a cutting device for cutting sheets using a heated thin blade has been proposed in order to suppress the adhesion of the cutting blade.
(For example, JP 49-13663, JP 56-62800
However, since the cutting device disclosed in Japanese Patent Publication No. 49-13663 is a heated thin-blade thermal cutter with a heating element built into the cutting edge, there is a concern that the cut surface of the rubber sheet may be overheated and burnt out. Further, the heated thin blade of this cutting device requires an extremely complicated and large-scale cutting angle adjustment device, and the adjustment thereof also has the disadvantage of being time-consuming.

On the other hand, the heated thin blade of the cutting device disclosed in JP-A No. 56-62800 has only one heating element in the center, and as a result, the temperature at both ends of the heated thin blade in the longitudinal direction is low, resulting in poor thermal cutting performance. On the other hand, the central part has the disadvantage of overheating and burning out the rubber sheet.

In addition, the heated thin blade of this cutting device uses a swing arm or pin to adjust the cutting angle, so it takes time to adjust the cutting angle, and even after adjustment, the angle may shift or the rubber sheet There is a problem in that there is an imbalance in the pressing force of the heated thin blade between the center and both ends of the cutting line. These tendencies are noticeable when cutting wide and thin unvulcanized rubber sheets.

[Problem to be solved by the invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above, and to solve the problem of wide and long unvulcanized To provide a cutting device for an unvulcanized rubber sheet, which can accurately press a heated thin blade onto the cutting position line of a rubber sheet, and can cut quickly and with high dimensional accuracy without generating wrinkles or unevenness on the pressing surface. There is a particular thing.

[Means for Solving the Problems] The gist of the present invention is to provide a conveyor mechanism for delivering a long unvulcanized rubber sheet, a cutting mechanism for cutting the long unvulcanized rubber sheet into short pieces using a heated thin blade, A cutting device for an unvulcanized rubber sheet consisting of a conveyor mechanism for pulling out short unvulcanized rubber sheets, in which a plurality of heating elements are integrally welded to the heated thin blade of the cutting mechanism and supported by the plurality of heating elements. This is because a pressing part is provided which can keep the cutting direction constant through the plate.

That is, the heated thin blade of the cutting mechanism of the present invention is installed above the axis of the drive roll in a direction perpendicular to the conveying direction of the conveyor belt of the delivery conveyor mechanism and perpendicular to the surface of the conveyor belt. A plurality of heating elements are welded at predetermined intervals to the longitudinal base of the heated thin blade, and these heating elements are integrally fixed to one support plate,
Furthermore, a piston rod connected to the cylinder that can move up and down is fixed to the center of the support plate, and guide rods are provided on both sides of the support plate, and these guide rods extend to both sides of the cylinder. The cutting device for cutting an unvulcanized rubber sheet is characterized in that the cutting device is inserted into a through hole of an arm.

[Function] The device for cutting an unvulcanized rubber sheet according to the present invention has the following features:
First, a heated thin blade is installed above the axis of the drive roll in a direction perpendicular to the conveying direction of the conveyor belt of the conveyor mechanism and perpendicular to the surface of the conveyor belt. The cutting position of the long unvulcanized rubber sheet is moved to the axis of the drive roll, and then a heated thin blade installed above the axis of the drive roll is pressed in a direction perpendicular to the direction of conveyor belt transport, so that the sheet can be cut. , Second, by welding a plurality of heating elements to the heating thin blade at a predetermined interval to the base in the longitudinal direction, the heat of the heating elements is evenly and gently conducted to the heating thin blade. The temperature distribution in the longitudinal direction of the heated thin blade is made uniform, so that when the heated thin blade is pressed, it semi-vulcanizes the unvulcanized rubber sheet along the cut surface line without overheating and burning out, curing and preventing adhesion. Thirdly, a plurality of heating elements are integrally fixed to a support plate, and a cylinder connecting piston rod that can move up and down is fixed to the center of the support plate, and guide rods are erected on each side of the support plate. Furthermore, by inserting these guide rods into the through holes of the arms extending on both sides of the cylinder, the heated thin blade can be accurately and longitudinally moved along the cutting position line of the long unvulcanized rubber sheet. The synergistic effect of these forces allows the heated thin blade to be accurately pressed onto the cutting position line of the long unvulcanized rubber sheet, quickly and without creating wrinkles or unevenness on the pressing surface. The purpose is to enable cutting with high dimensional accuracy.

[Example] Next, an example of the cutting device for an unvulcanized rubber sheet according to the present invention will be described with reference to the drawings. The drawing is a perspective explanatory view showing an unvulcanized rubber sheet being cut by an embodiment of the unvulcanized rubber sheet cutting device of the present invention.

That is, an embodiment of the unvulcanized rubber sheet cutting device of the present invention is roughly divided into a conveyor mechanism 1,
16 and a cutting mechanism 4.

A conveyor mechanism 1 is a conveyor for sending out a long unvulcanized rubber sheet, and is composed of a conveyor belt 2 and a drive roll 3. This conveyor mechanism 1 rotates a drive roll 3 by operating a drive motor (not shown).
The rotation of the conveyor belt 2 causes the conveyor belt 2 to rotate.

On the other hand, the conveyor mechanism 16 is a conveyor that takes over the cut short unvulcanized rubber sheets, and its structure and driving method are the same as those of the conveyor mechanism 1.

The cutting mechanism 4 is installed above the drive roll 3 of the conveyor mechanism 1, and includes a heated thin blade 6, a cylindrical heater 7, a support plate 8, a piston rod 9, a cylinder 10, a pressing part 11, guide rods 12, 13,
It consists of an arm 14, a through hole 15, etc.

Here, the heated thin blade 6 is installed so as to be perpendicular to the transport direction of the delivery side conveyor belt 2 of the conveyor mechanism 1 and perpendicular to the surface of the delivery side conveyor belt 2.

A plurality of heaters 7 are welded to the base side of the heated thin blade 6 at predetermined intervals using silver solder or the like, and these plurality of heaters 7 are integrally fixed to a single support plate 8. There is. The tip of a piston rod 9 is integrally fixed to the center of the support plate 8, and the tips of guide rods 12 and 13 are oriented in the same direction as the piston rod 9 at both ends of the support plate 8 in the longitudinal direction. It is fixed as follows. Although not shown, a power cord is connected to the heater 7.

The base of the piston rod 9 is integrally fixed to a cylinder 10 built in the pressing part 11, and
There are through holes 15, 15 on both sides of the cylinder 10.
The arms 14, 14 having the above are fixed together. Guide rods 12 and 13 are inserted into these through holes 15 and 15 so that they can move forward and backward.

That is, when the cylinder 10 moves forward, the support plate 8 moves forward, and accordingly, the heated thin blade 6 fixed to the support plate 8 via a plurality of heaters 7 moves forward. Conversely, when the cylinder 10 retreats, the support plate 8 retreats, and the heated thin blade 6 fixed to the support plate 8 retreats accordingly.

Here, the support plate 8 is fixed at its center to a piston rod 9 that moves back and forth, and on both sides of the support plate 8 is fixed to guide rods 12 and 13 inserted into through holes 15 and 15 on both sides of the cylinder 10, so that it moves back and forth. The heated thin blade 6 fixed to the support plate 8 can always be in a direction perpendicular to the transport direction of the delivery side conveyor belt 2.

In addition, since the heated thin blade 6 is heated via a plurality of heaters 7 welded at predetermined intervals on its base side, the long heater 7 can be heated to a uniform temperature distribution, and moreover, Since the heated thin blade 6 is heated by thermal conduction, it can be heated uniformly and gently without overheating, and as a result, it is possible to completely prevent rubber burnout and overheating that would occur with direct heating of the heater.

Next, an example of cutting an unvulcanized rubber sheet using an embodiment of the unvulcanized rubber sheet cutting device of the present invention will be described with reference to the drawings.

First, in order to make the five heaters 7 generate heat,
Power is supplied via a power cord (not shown). When the five heaters 7 generate heat, the heat is uniformly and gently conducted from these five heaters 7 to the thin blade 6, and the cutting edge of the heated thin blade 6 is heated uniformly in the longitudinal direction.

On the other hand, a long unvulcanized rubber sheet is placed on the conveyor mechanism 1 on the sending side, a drive motor (not shown) is activated to send out the long unvulcanized rubber sheet, and when the cutting position reaches the top of the roll 3 Stop the drive motor.

Next, when the cylinder 10 of the cutting mechanism 4 is moved forward, the support plate 8 moves forward, and accordingly, the heated thin blade 6 fixed to the support plate 8 moves forward and is pressed onto the cutting position line of the unvulcanized rubber sheet. . When this pressing is performed for about 1 to 2 seconds, the rubber sheet is semi-vulcanized, and then the unvulcanized rubber sheet is cut along the cutting position line quickly and with high dimensional accuracy.

When the cutting is completed, the cylinder 10 is retracted,
As the support plate 8 moves back, the heated thin blade 6 fixed to the support plate 8 also moves back. Further, when the heated thin blade 6 retreats, a conveyor mechanism 16 on the take-up side is activated, and the cut short unvulcanized rubber sheet is pulled out.

Hereafter, these operations will be repeated.

[Effect of the invention] The cutting device for unvulcanized rubber sheet according to the invention has the following features:
A heated thin blade is pressed with precise and uniform force along the cutting position line of a long unvulcanized rubber sheet to semi-vulcanize it, thereby completely suppressing adhesion to the surface of the heated thin blade and applying adhesive to the cut surface. It is industrially useful because it completely eliminates the occurrence of wrinkles and unevenness, and as a result allows cutting to be performed quickly and with high dimensional accuracy.

[Brief explanation of the drawing]

The drawing is a perspective explanatory view showing an unvulcanized rubber sheet being cut by an embodiment of the unvulcanized rubber sheet cutting device of the present invention. 1, 16: conveyor mechanism, 2: conveyor belt, 3: drive roll, 4: cutting mechanism, 5: unvulcanized rubber sheet subjected to cutting, 6: heated thin blade, 7:
Heater, 8: Support plate, 9: Piston rod, 1
0: Cylinder, 11: Pressing part, 12,1
3: Guide rod, 14: Arm, 15: Through hole.

Claims (1)

[Scope of utility model registration request] A conveyor mechanism for sending out a long unvulcanized rubber sheet consisting of a drive roll and a conveyor belt, a cutting mechanism for cutting the long unvulcanized rubber sheet with a heated thin blade, and a conveyor mechanism for drawing out the short unvulcanized rubber sheet. A device for cutting an unvulcanized rubber sheet, the heating thin blade of the cutting mechanism being perpendicular to the conveying direction of the conveyor belt of the delivery conveyor mechanism and perpendicular to the surface of the conveyor belt. It is installed above the axis of the drive roll, and a plurality of heating elements are welded at a predetermined interval to the longitudinal base of the heated thin blade, and the plurality of heating elements are integrally fixed to a support plate. A piston rod connected to a cylinder that can move up and down and back is fixed to the center of the support plate, and guide rods are erected on both sides of the support plate. 1. A cutting device for cutting an unvulcanized rubber sheet material, characterized in that the device is inserted into a through hole of an arm extending from the side.