JPS6274635A - Shaping device for tire - Google Patents

Abstract

PURPOSE:To simplify the structure as well as to prevent the detecting means from being broken even through an excessive loading is acted on the cutter by providing the frame with the non-contact system detecting means which detects the external configuration of the tread part of a tire separately from the cutter unit. CONSTITUTION:A non-contact system detecting means 55 which detects the external configuration of a tread part 2 of a green tire 1 as a whole is constituted of a projector 52 and a light-receiving device 54. A control means 56 sends out a signal to a motor 15 on the basis of the detected result from the detecting means 55 to control the position at the time of cutting by a cutter 48, that is, the lengthwise positions of a frame 14 at the time of cutting-in by the cutter 48, so that the cutter 48 always cuts off a constant amount of a rubber material. Moreover, the signal from this control means 56 is outputted to motors 19, 33, 43 and 47 as well to control the operating period of each motor and its number of revolutions.

Description

[Detailed description of the invention] 1,100,000 on production-1 The present invention relates to a tire shaving device.

疋"31 Techniques" In general, tires with deep grooves formed in the tread, such as agricultural tires, are made with raw tires to prevent the plies from shifting due to excessive rubber flow during vulcanization. In this step, deep grooves similar to pattern grooves are formed in the tread portion.

However, even if a green tire is filled with sufficient internal pressure,
The radius of the tread portion is not uniform and is uneven in the circumferential direction. For this reason, if the raw tire is intermittently rotated by a cutter that always follows a fixed trajectory and the rubber on the tread is removed one after another, the amount of rubber removed varies each time, resulting in a production tire There is a problem in that the weights of the two materials differ by one tree.

In order to solve these problems, a tire shaving device has been proposed, for example, as described in Japanese Patent Application Laid-Open No. 59-215849. This device is equipped with a blade edge that cuts the tire rubber and a blade edge contact detection sensor that detects when the cutter comes into contact with the tire, at the tip of the cutter device, and when the sensor detects that the blade edge has contacted the tire. The cutting edge is moved according to a program from then on to remove a certain amount of rubber from the tire, regardless of the unevenness of the tire radius.

- is heard. However,
Such tire shaving devices have both the cutting edge and the sensor at the tip of the cutter device, so the structure is complicated and there is a risk that the sensor may be damaged if an excessive load is applied to the cutter. There is a problem.

``Treasure'' Such a problem is that in a tire shaving device that partially cuts off the rubber on the tread while rotating the tire intermittently, there is a frame that moves toward and away from the tire, and a frame that moves toward and away from the tire. A non-contact detection means is attached to the frame and detects the outer shape of the tread of the tire, a drive means is attached to the frame and drives a cutter that cuts out the rubber of the tread, and the detection results of the detection means are greatly affected. This problem can be solved by providing a control means for controlling the cutter position at the time of cutting.

Without saying anything, move the frame closer to the tire. When the non-contact detection means detects the outer shape of the tread portion of the tire, this detection result is sent to the control means. Thereby, the control means sends a signal regarding the position of the cutter at the time of cutting to the frame or the drive means.1.
The frame is moved or the drive means is activated to move the cutter to the desired position. Further, the drive means is also activated, and the cutter is moved after cutting into the tread portion to remove a predetermined amount of rubber. At this time, since the detection means and the sensor are installed separately on the frame, the structure is simplified and the detection means will not be damaged even if an excessive load is applied to the cutter.

Support 1 Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Fig. 1.2, reference numeral 1 denotes a raw tire that is intermittently rotated at a predetermined angle while being supported upright by a rotating means (not shown). Approximate deep grooves 3 are formed. 11 is a shaving device installed behind the green tire 1, and this shaving device 11 has a horizontal base 12. A pair of guide rails 13 extending in the front-rear direction are fixed on the base 12, and a frame 14 is slidably supported on the guide rails 13. 1
Reference numeral 5 denotes a servo motor fixed to the base 12. A screw shaft 16 parallel to the guide rail 13 is connected to the motor 15, and the screw shaft 16 is screwed into the frame 14. As a result, when the motor 15 is activated, the frame 14 moves forward and backward while being guided by the guide rail 13, approaching and away from the raw tire l. frame 1
A vertical pivot shaft 17 is rotatably supported at the front end of 4.
One end portion of an L-shaped pivot frame 18 is fixed to this pivot shaft 17 . A servo motor 19 is fixed to the bent portion of the rotating frame 18, and this motor 1
A tin rocket 21 is fixed to the rotating shaft 20 of 9. A chain 23 is passed between the sprocket 22 and the sprocket 21 fixed to the frame 14,
As a result, when the motor 19 operates, the pivot shaft 17 pivots about the axis of the pivot shaft 17 together with the pivot frame 18 .

A bearing 31 is attached to the other end of the rotating frame 18,
A horizontal rotation shaft 32 extending in the front-rear direction is rotatably supported by the bearing 31. A motor 33 with a speed reducer is fixed on the bearing 31, and the output shaft 3 of this motor 33
A gear 35 is connected to 4. The gear 36 connected to the rotation shaft 32 and the gear 35 mesh with each other,
Thereby, when the motor 33 operates, the rotation shaft 32 rotates around its axis. The upper end of a vertical plate 41 is fixed to the tip of the rotation shaft 32, and the vertical plate 41
A pair of guide rails 42 extending in the vertical direction are fixed to the front surface facing the green tire 1. 43 is a servo motor fixed to the upper end of the vertical plate 41, and an output shaft 44 of this motor 43 is connected to a screw shaft 45 parallel to the guide rail 42. 4B is guide rail 42
This is an elevating platform that is slidably supported by the elevating platform 4B.
The threaded shaft 45 is screwed into the screw shaft 45, and as a result, when the motor 43 is operated, the lifting platform 46 moves up and down while being guided by the guide rail 42. A motor 47 is attached to the lifting table 46, and both ends of a U-shaped cutter 48 are connected to the motor 47, so that when the motor 47 is operated, the cutter 48 rotates. The aforementioned rotating frame 18. The motor 19, the rotating shaft 32, the motor 33, the vertical plate 41, the motor 43, the lifting platform 46, and the motor 47 collectively constitute a driving means 49 for driving the cutter 48. A support frame 51 is connected to the front end of the frame 14, and a number of projectors 52 are attached to the tip of the support frame 51 located forward and below the cutter 48. A support frame 53 is connected to the rear end of the frame 14, and a number of light receivers 54 located directly above the light projector 52 are attached to the tip of the support frame 53. These floodlights 52
As shown in FIG. 2, the light receivers 54 are arranged on a straight line parallel to the rotational axis of the green tire. The above-mentioned light emitter 52 and light receiver 54 collectively constitute a non-contact detection means 5 for detecting the outer shape of the tread portion 2 of the raw tire l.
5. 5B is a control means such as a microcomputer, and this control means 56 sends a signal to the motor 15 based on the detection result from the detection means 55, and controls the cutter 4.
The position of the cutter 48 at the time of cutting, that is, the longitudinal position of the frame 14 at the time of cutting, is controlled so that the cutter 8 always cuts a certain amount of rubber.

Further, the signal from this control means 56 is transmitted to the motor 19.3.
3.43.47 is also sent to control the operating timing and rotation speed of each motor.

Next, the operation of one embodiment of the present invention will be explained.

First, a green tire 1 in which deep grooves 3 are not formed is mounted on a rotating means.Next, a signal is sent from the control means 56 to the motor 19, and the motor 19 is activated.

As a result, the rotating frame 1 rotates around the rotating axis 17, and the control means 56 moves the cutter 48 to the side where the rubber is to be cut, that is, to one side or the other side of the equatorial plane of the green tire. When a signal from 1 is sent to the motor 33, the vertical plate 41 rotates about the rotation axis 32 by the same angle as the angle at which the deep groove a intersects the equatorial plane.
Next, the motor 15 is actuated by a signal from the control means 56 to rotate the screw shaft 16, and the drive means 49 and the detection means 55 are moved forward together to approach the green tire 1.

When the detection means 55 approaches the raw tire 1, the moving speed of the frame 14 is reduced. In this state, when the light from the light emitter 52 is blocked by the tread portion 2 and no longer enters the light receiver 54, the detection means 55 detects the tread portion 2. Here, the outer shape of the tread portion 2 of each raw tire 1 is determined by the fact that the ply is attached at different positions.
Due to differences in storage conditions, there may be slight differences, especially the maximum radius position may shift slightly in the axial direction of the raw tire 1.
In this embodiment, a large number of light projectors 52 and light receivers 54 are arranged on a straight line parallel to the rotational axis of the green tire l, and one of the light receivers 54 detects this maximum radius position, and this detection position is connected to the deep groove 3. This is the starting point for the cut. As a result, the outer shape of the tread portion 2 can be accurately grasped compared to the case where the outer shape of the tread portion 2 is detected and output using a pair of light receivers, thereby reducing fluctuations in the amount of rubber to be removed. be able to. Then, when this detection result is sent from the detection means 55 to the control means 56, the control means 56 sends a signal to the motor 15 to advance the frame 14 by a distance equal to the amount of cut into the deep groove 3 and to move the cutter 48 to the green tire 1. bring them closer. and,
When the frame 14 moves by the distance and stops, a signal is sent from the control means 5B to the motor 47, and as a result,
The cutter 48 rotates approximately 90 degrees from the position shown by the solid line in FIG. 1 to the position shown by the phantom line, and the tread i'! 1!0 Cut into 2 Next, when a signal is sent from the control means 56 to the motor 43, the screw shaft 45 rotates, and the lifting platform 46 is integrated with the cutter 48 and guided by the guide rail 42 downward. move towards. At this time, vertical plate 4
1 has an inclined # as described above, the cutter 48 cuts out a certain amount of rubber from the tread portion 2 to form the inclined deep groove 3 as shown in FIG. 2. Next, the motor 15.
18.33.Activate 43,47 to shaving device 1
Next, the raw tire 1 is rotated by a predetermined angle to prepare for the formation of the primary deep groove 3. Although one deep groove 3 is formed in this way, a large number of deep grooves 3, for example 14 to 16 deep grooves 3, are subsequently formed on the outer periphery of the tread portion 2 in the same manner.

In the above embodiment, a large number of light projectors 52 and light receivers 54 as detection means are arranged on a straight line parallel to the rotational axis of the green tire 1 to detect the outer shape of the tread portion 2. As described above, in this invention, an image detector such as a television camera or an image sensor is used as the detection means, and the position of the cutter at the time of cutting is calculated from the area of the tire occupied within the field of view of this image detector. Alternatively, the amount of rubber to be removed may always be a constant amount.In this way, the detection accuracy is improved and the fluctuation in the amount of rubber to be removed can be reduced. Furthermore, in the present invention, the raw tire is rotated at a predetermined angle around its axis of rotation while the detection means detects the outer shape of the tread, and thereby the radial fluctuation of the tread in the area where the rubber is to be removed is detected in detail. In this way, when determining the position of the cutter when cutting, it is possible to take into account radial fluctuations due to differences in the circumferential position of the tire, so it is possible to detect the position of the rubber to be cut. Variations in quantity can be further reduced.

Further, the present invention can also be applied to vulcanized tires. Furthermore, in the present invention, in order to simplify the structure, a detector and a light receiver may be provided on one side and the other side of the tire equatorial plane, respectively, and the radial fluctuation of the tire may be individually detected.

Further, in the above-mentioned embodiment, a case was explained in which the cutter was advanced to the cutting position by moving the frame 14, but in this invention, apart from the frame, for example, a screw shaft is provided on the drive means to move the cutter forward and backward. The cutter may be moved in this direction, and the screw shaft or the like may be actuated to advance the cutter to the cutting position.

As explained above, according to the present invention, the structure is simplified and the detection means will not be damaged even if an excessive load is applied to the cutter.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a schematic perspective view thereof. 1... Tire 2... Tread portion 14.
... Frame 48 ... Cutter 49 ... Drive means 55 ... Detection means 5G ... Control means

Claims (1)

[Claims] A tire shaving device that partially cuts off the rubber of the tread while rotating the tire intermittently includes a frame that approaches and separates from the tire, and a frame that is attached to the frame to shave the outer shape of the tread of the tire. a non-contact detection means for detecting; a drive means for driving a cutter attached to the frame for cutting off the rubber of the tread; and a control means for controlling the cutter position at the time of cutting based on the detection result of the detection means. A tire shaving device comprising: