JP2016221592A - Rubber strip cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber strip cutter which makes cutter blade height adjustment work by an operator unnecessary.SOLUTION: Provided is a rubber strip cutter which cuts an unvulcanized belt-like rubber strip used in the strip wind method, comprising a pneumatic cylinder which includes a cylinder body which is filled with compressed air and a piston rising and falling in the cylinder body, a cutter blade which is attached to the piston and enters into and exits from the pneumatic cylinder, corresponding to rising and falling of the piston, air supply means which supplies compressed air into the cylinder body, and control means which controls the air pressure inside the cylinder body as a constant pressure. The control means comprises an exhaust port which exhausts the compressed air in the cylinder body and an exhaust valve which is provided at the exhaust port and opens the exhaust port when the air pressure inside the cylinder body exceeds a specified pressure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rubber strip cutter for cutting a strip-shaped rubber strip in a strip wind method.

  The strip wind method is a technology for forming a rubber member by winding a belt-shaped unvulcanized rubber strip that has been conveyed on a conveying belt around a forming drum, and at the end of the wrapping, the rubber strip is formed on the conveying belt. It has cut | disconnected (for example, patent document 1).

  4 is a front view showing a conventional rubber strip cutter, FIG. 5 is a perspective view thereof, and FIG. 6 is a side view for explaining cutting of the rubber strip using the conventional rubber strip cutter.

  As shown in FIGS. 4 and 5, the conventional rubber strip cutter a is configured by fixing a cutter blade c to a cutter body b, and as shown in FIG. It is arranged so as to be rotatable as indicated by an arrow A with the center point O as the center. At this time, the rubber strip cutter a rotates once in the same speed and in the same direction as the conveyor belt d, thereby cutting the rubber strip S conveyed on the conveyor belt d.

JP 2014-217999 A

  However, since there are various types of rubber strips and various thicknesses, conventionally, the cutter blade c is released according to each rubber strip and the height from the conveying belt d is adjusted. Therefore, an appropriate cutting is performed.

  This height adjustment is conventionally performed by an operator, but it is necessary to confirm the actual product after adjustment, resulting in production loss. In addition, the adjustment results may vary depending on the skill of the operator.

  If the height of the cutter blade is too high in the adjustment operation, a rubber strip cut defect occurs, and defects such as A / T (problems caused by air remaining inside the tread layer) occur in the product tire. There is also a fear, and there is a possibility that the uniformity may be adversely affected.

  On the other hand, if the height of the cutter blade after adjustment is too low, the cutter blade and the conveyor belt may come into contact with each other.

  This invention is made | formed in view of said point, Comprising: It aims at providing the cutter for rubber strips which makes the height adjustment work of the cutter blade by an operator unnecessary.

The invention described in claim 1
While transporting the unvulcanized belt-shaped rubber strip used in the strip wind method by the transport belt, the rubber strip is lowered while rotating in the same direction as the transport direction from the standby position above the transport belt to cut the rubber strip. A rubber strip cutter having a cutter blade to be installed,
A pneumatic cylinder having a cylinder body filled with compressed air and a piston that moves up and down in the cylinder body;
A cutter blade attached to the piston and entering and exiting the pneumatic cylinder as the piston moves up and down;
Air supply means for supplying compressed air into the cylinder body;
Control means for controlling the air pressure in the cylinder body to a constant pressure,
The control means is
An exhaust port for exhausting compressed air in the cylinder body;
The rubber strip cutter is provided with an exhaust valve that is provided at the exhaust port and opens the exhaust port when the air pressure in the cylinder body exceeds a predetermined pressure.

The invention described in claim 2
The rubber strip cutter according to claim 1, further comprising an upper limit stopper and a lower limit stopper that limit the lifting amount of the piston.

The invention according to claim 3
3. The rubber strip cutter according to claim 1, further comprising a spring body that urges the exhaust valve toward the exhaust port.

  ADVANTAGE OF THE INVENTION According to this invention, the cutter for rubber strips which makes the height adjustment operation | work of the cutter blade by an operator unnecessary can be provided.

It is a side view explaining the cutting | disconnection of the rubber strip using the cutter for rubber strips which concerns on one embodiment of this invention. It is a perspective view which shows the cutter for rubber strips which concerns on one embodiment of this invention. FIG. 2 is an enlarged view of a portion X in FIG. 1. It is a front view which shows the conventional cutter for rubber strips. It is a perspective view which shows the conventional cutter for rubber strips. It is a side view explaining the cutting | disconnection of the rubber strip using the conventional cutter for rubber strips.

1. Outline of Rubber Strip Cutter According to the Present Invention The rubber strip cutter according to the present invention cuts the rubber strip conveyed on the conveyor belt by making one rotation in the same speed and the same direction as the conveyor belt. This is the same as a conventional rubber strip cutter.

  However, in the rubber strip cutter according to the present invention, since the height of the cutter blade can be automatically adjusted using a pneumatic cylinder, an operator can cut the cutter according to the rubber strip as in the past. Even if the height of the blade is not adjusted, it is possible to appropriately prevent the cutting failure due to the cutter blade being too high and the damage of the conveying belt due to being too low.

2. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a side view for explaining cutting of a rubber strip using the rubber strip cutter according to the present embodiment, FIG. 2 is a perspective view showing the rubber strip cutter according to the present embodiment, and FIG. It is an enlarged view of X part.

(1) Pneumatic cylinder and cutter blade As shown in FIGS. 1 and 2, the rubber strip cutter 1 according to the present embodiment includes a pneumatic cylinder 2 and a cutter blade 3.

  As shown in FIG. 1, the pneumatic cylinder 2 includes a box-shaped cylinder main body 21 that is filled with compressed air, and a piston 22 that can be moved up and down along the guide portion 23 in the cylinder main body 21. .

  A cutter blade 3 is attached to the piston 22, and the cutter blade 3 enters and exits the pneumatic cylinder 2 as the piston 22 moves up and down.

  At this time, in order to appropriately control the amount of movement of the cutter blade 3, the guide portion 23 is provided with an upper limit stopper 24 and a lower limit stopper 25 to control the lifting / lowering amount of the piston 22. Usually, the interval between the upper limit stopper 24 and the lower limit stopper 25 is set to about 5 mm.

(2) Air Supply Unit The rubber strip cutter 1 according to the present embodiment includes an air supply unit (not shown) for supplying compressed air into the cylinder body 21 of the pneumatic cylinder 2. The air supply means is connected to an air supply port 26 (see FIG. 2) of the cylinder body 21 via an air supply pipe.

  The air supply means always supplies compressed air to the cylinder body 21 to keep the air pressure in the cylinder body 21 constant (for example, 1100 hPa). Thereby, in the standby state before cutting the rubber strip S, the cutter blade 3 is disposed at the lower limit position by the piston 22 that is lowered by the air pressure in the cylinder body 21.

(3) Control Means Next, the rubber strip cutter 1 according to the present embodiment maintains a constant air pressure in the cylinder body 21 in order to appropriately adjust the height of the cutter blade 3 when the rubber strip S is cut. The control means to control is provided.

  As shown in FIG. 3, the control means presses the exhaust port 4 provided in the cylinder body 21, the exhaust valve 5 that opens and closes the exhaust port 4, and the exhaust valve 5 toward the exhaust port 4 with a predetermined spring force. The spring body 6 is provided. 3 is a jig for attaching the exhaust valve 5 and the spring body 6 to the cylinder body 21.

  In this control means, an external pressure that pushes up the piston 22 is applied, such as when the cutting edge of the cutter blade 3 comes into contact with the transport belt B, and the air pressure in the cylinder body 21 exceeds the pressing force of the spring body 6. The exhaust valve 5 is opened, and the air in the cylinder body 21 is exhausted from the exhaust port 4. Thereby, since the air pressure in the cylinder main body 21 is lowered, the piston 22 rises and the cutter blade 3 enters the cylinder main body 21.

3. Next, a method for cutting the rubber strip S using the rubber strip cutter 1 will be described.

  As described above, the rubber strip cutter 1 according to the present embodiment is rotated at the same speed and in the same direction as the conveyor belt B around the center point O as in the conventional rubber strip cutter. The rubber strip S conveyed on the conveyor belt B is cut.

  At this time, the cutting of the rubber strip S is started in a state where the cutter blade 3 comes out to the lower limit by the compressed air supplied into the cylinder body 21. When the cutter blade 3 comes into contact with the conveyor belt B under the rubber strip S, the air pressure in the cylinder body 21 rises. When this occurs, the exhaust valve 5 is opened and the exhaust port 4 is opened. By opening, the air in the cylinder body 21 is discharged and the air pressure decreases. Along with this, the piston 22 rises, and at the same time, the cutter blade 3 attached to the piston 22 rises.

  As described above, the rubber strip cutter according to the present embodiment is configured so that the height of the cutter blade can be automatically adjusted using a pneumatic cylinder. The person does not have to adjust the height of the cutter blade. For this reason, it is possible to prevent production loss due to adjustment work and variations in adjustment results due to the skill of the operator.

  Further, it is possible to suppress the occurrence of defective cutting due to the height of the cutter blade 3 being too high, and to suppress the occurrence of defects due to the defective adjustment of the height of the cutter blade and the effect on tire uniformity. it can.

  Moreover, when the cutter blade 3 after height adjustment is too low, it is possible to prevent the cutter blade 3 and the transport belt B from coming into contact with each other and causing equipment failure.

1. Examples and Comparative Examples Three types of rubber strips (Formulation A, Formulation B, and Formulation C) with different formulations were prepared, and the rubber strips were cut using the rubber strip cutters of Examples and Comparative Examples shown below.

(1) Examples In the examples, the rubber strip was cut using the rubber strip cutter according to the above-described embodiment. The air pressure in the cylinder body was set to 1100 hPa.

(2) Comparative Examples 1-3
In Comparative Examples 1 to 3, a rubber strip cutting test was conducted using the conventional rubber strip cutter shown in FIG.

  In Comparative Example 1, the height of the cutter blade was kept constant and the height of the cutter blade was not adjusted in cutting any rubber strip of Formulation A to Formulation C.

  In Comparative Example 2 and Comparative Example 3, different operators adjusted the height of the cutter blade in accordance with the composition of the rubber strip. Specifically, in Comparative Example 2, worker A made adjustments, and in Comparative Example 3, worker B made adjustments.

2. Evaluation In each of the experimental examples and comparative examples 1 to 3, the rubber strip was cut with the conveying belt speed set to 1500 mm / s, and whether or not a cut defect occurred was evaluated. The test results are shown in Table 1. “Permitted” in Table 1 indicates that the cutting was performed as usual, and “Not possible” indicates that a cutting failure occurred.

  When the height of the cutter blade was made constant from Comparative Example 1, it was confirmed that there was a blending that could not be handled due to the occurrence of cutting failure depending on the type of rubber strip. Moreover, it was confirmed from Comparative Examples 2 and 3 that there is variation in the adjustment work by the operator.

  On the other hand, in the examples, it can be seen that the rubber strip can be appropriately cut regardless of the type of the rubber strip, and by using the rubber strip cutter according to the present embodiment, adjustment work by the operator can be made unnecessary. Was confirmed.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1, a Rubber strip cutter 2 Pneumatic cylinder 3, c Cutter blade 4 Exhaust port 5 Exhaust valve 6 Spring body 7 Jig 21 Cylinder body 22 Piston 23 Guide portion 24 Upper limit stopper 25 Lower limit stopper 26 Air supply port B, d Conveyor belt b Cutter body O Center point S Rubber strip

Claims (3)

While transporting the unvulcanized belt-shaped rubber strip used in the strip wind method by the transport belt, the rubber strip is lowered while rotating in the same direction as the transport direction from the standby position above the transport belt to cut the rubber strip. A rubber strip cutter having a cutter blade to be installed,
A pneumatic cylinder having a cylinder body filled with compressed air and a piston that moves up and down in the cylinder body;
A cutter blade attached to the piston and entering and exiting the pneumatic cylinder as the piston moves up and down;
Air supply means for supplying compressed air into the cylinder body;
Control means for controlling the air pressure in the cylinder body to a constant pressure,
The control means is
An exhaust port for exhausting compressed air in the cylinder body;
A rubber strip cutter, comprising: an exhaust valve that is provided at the exhaust port and opens the exhaust port when the air pressure in the cylinder body exceeds a predetermined pressure.   The rubber strip cutter according to claim 1, further comprising an upper limit stopper and a lower limit stopper that limit the lifting amount of the piston.   The rubber strip cutter according to claim 1 or 2, further comprising a spring body that urges the exhaust valve toward the exhaust port.

Images