JPH01163051A - Grooving apparatus - Google Patents

Abstract

PURPOSE:To process a pattern groove having required inclination and to dispense with a rotary shaft for inclining a cutter support apparatus, by mounting a cutter to the cutter holder of the cutter support apparatus arranged in the direction right angled to a tire support shaft so as to incline the same at an arbitrary angle of inclination. CONSTITUTION:A cutter support frame 13 is fixed to a support rod 12 and the leg part of a cutter 10 is inserted in a pair of the cutter clampers 20 in the cutter holder 17 held to the engaging groove 16 of the cutter support frame 13 to be fixed in a state grasped between the cutter and the clamps. When a pattern groove is processed, a front-shape cutter 10 is symmetric with respect to the center axis (l) of the cutter holder 17 and mounted vertically with respect to a tire support shaft and cut in the tire vertically to process the pattern groove 24a. When a pattern groove 24b is processed at a position where a groove center line (n) has an angle theta of inclination, the cutter 10 is mounted so that the center line (p) thereof is inclined by theta with respect to the center axis (l) of the cutter holder. In the processing of the pattern groove 24c present at the position symmetric to the pattern groove 24b, the direction of the cutter 10 is made opposite to that at the time of the processing of the pattern groove 24b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention uses a plurality of cutter operating shafts to control the movement of a cutter to create a desired pattern of grooves on the surface of a vulcanized or uncured plain tire. In a grooving device that cuts tires, the number of operating axes can be reduced by attaching the cutter at an arbitrary inclination angle to the cutter holder of the cutter support device, which is placed perpendicular to the tire support axis. This is what I did.

(Prior art) A device for grooving the tread surface of a new or retreaded tire has a tire support shaft that supports and rotates the tire, and a transverse shaft that moves a cutter support device in the Y-axis direction parallel to the tire support shaft. and a cutter support device to cut a pattern groove in which the groove center line has a desired inclination angle with respect to the vertical line at the center of the tread. Some have a rotating shaft for tilting the cutter and a rotating shaft for rotating the cutter support shaft to change the cutting direction of the cutter.

To explain this with reference to FIG. 7, l is a base, 2 is a tire, and 3 is a tire support stand mounted on the base i, which is equipped with a tire support shaft 31 that rotatably supports the tire 2 in six directions. No drive motor is provided. 4
5 is a moving table that moves along the guide bar 41 on the base L in the X-axis direction perpendicular to the tire support axis and positions the tire and the cutter in advance; 5 moves on the moving table 4 along the guide rail 51; A transverse table 6 moves in the Y-axis direction parallel to the tire support axis, and a transverse table 6 moves up and down along the guide rod 61 on the transverse table 5 by rotation of a screw shaft 63 by a motor 62 and moves in the Z-axis direction. , 7 are arm support shafts projecting from the orthogonal table 6 in the X-axis direction, and are driven by a motor (not shown) in the orthogonal table 6 to rotate the rotating arm 8 in the direction of arrow B in FIG. Reference numeral 9 denotes a cutter support device supported by a rotary shaft 12 on a rotary arm 8, and a cutter 10 formed in a substantially U-shape symmetrically with respect to the central axis of the gutter support device is attached to the tip end of the cutter support device. is rotated by a motor 81 in the direction of arrow C to change the cutting direction of the cutter lO, and the cutter support device is tilted by rotation of the rotary arm 8 in the direction of arrow B. 23 is a power supply device for heating the cutter.

(Problems to be Solved by the Invention) Therefore, pattern grooves having a desired inclination angle with respect to a vertical line perpendicular to the tangent at the center of the tread are cut into a tire tread surface having a curved surface in the width direction. In this case, in order to tilt the cutter support device 9 with respect to the vertical line at the center of the tread, in addition to a number of operating axes such as transverse and orthogonal, a rotation axis for rotating the rotation arm 8 in the direction of arrow B is provided. (arm support shaft 7), and each shaft requires a drive device and its control device, which has the disadvantage that the device becomes complicated and large, and the control system is also complicated. Note that for tires with large tread radius, such as truck tires and race tires, the groove shape is relatively simple and there is often no need to change the cutter inclination frequently, but if the groove to be machined changes, the cutter inclination must be changed. Therefore, it was not possible to omit the rotation shaft of the rotation arm for tilting the cutter support device.

(Means for Solving the Problems) The present invention provides a transverse axis for relatively moving a cutter support device having a cutter holder to which a cutter is attached in a direction parallel to a tire support axis; In the grooving device, the cutter support device is rotatably supported in the direction perpendicular to the tire support shaft, and the cutter support device is rotatably supported in the direction perpendicular to the tire support shaft. A cutter support device that removably holds a cutter that is tilted with respect to the center line of the cutter holder according to the inclination angle is provided, and the cutter of this cutter support device can be held at different inclinations depending on the inclination of the pattern groove in the cross section. By replacing the cutter with a cutter, a pattern groove with a necessary inclination angle can be processed without tilting the cutter support device.

(Function) Therefore, the cutter is held in the cutter holder of the cutter support device at an angle of inclination corresponding to the inclination of the pattern groove, and the support arm that attaches the cutter support device in a direction perpendicular to the tire support shaft remains fixed to the orthogonal table. By performing grooving, a pattern groove with a desired inclination can be obtained in the cross section, and a rotation shaft for inclining the cutter support device can be omitted.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention, and the same parts as in FIG. 4 are given the same reference numerals, and the explanation of these parts will be omitted.

In FIG. 1, reference numeral 11 denotes a support arm fixed to the side surface of the orthogonal table 6, and the cutter support device 9 is connected to the motor 8 as in the conventional case.
1, the cutter is rotatably mounted so that the cutting direction of the cutter can be changed. That is, in this cutter support device 9, a support rod 12 rotated by a motor 81 is supported by a support arm 11, and a cutter support frame 1 is attached to this support rod 12.
3 is fixed. In FIG. 2, a connecting piece 14 is attached to one side of the cutter support frame 13 with a screw 15, and a dovetail-shaped fitting groove 16 is formed inside this connecting piece. The cutter holder 17 is insulated left and right through an insulating spacer 19, and the legs of the cutter 10 are inserted into the holding grooves 21 provided on the back of the pair of cover clamps 20, and the tightening screws 2
2, it is clamped and fixed between the cutter and the clamp. 23 is a power supply device for heating the cutter, 24a, 24b, 2 in FIG.
4c is a pattern groove in the cross section of the tire.

Note that the grooving device used in the present invention is not limited to the structure shown in FIG.
In the grooving device having the structure disclosed in Japanese Patent No. 2633, instead of using the cutter rotating shaft, the cutter can be installed by tilting the cutter according to the inclination of the cross-sectional shape of the pattern groove according to the method of the present invention.

This cutter holder 17 is designed so that the insulating base 18 is inserted into the fitting groove 16 of the cutter support frame 13 and fixed with the connecting piece 14. Therefore, when replacing the cutter 10, it is necessary to hold the necessary cutter in advance. By providing a cutter holder in the form of a cassette and inserting it into the fitting groove 16, the effort and time required to replace the cutter can be reduced.

The cutter lO with the front shape shown in FIG.
Since the cutter support device 9 is attached to the support arm 11 in a direction perpendicular to the tire support shaft 31, the cutter is cut in a direction perpendicular to the tire support shaft 31, A pattern groove 24a shown in FIG. 3 is processed. Pattern grooves 2 are formed at positions where groove center lines n are inclined at an angle θ with respect to a vertical line m drawn toward the center axis of the tire support shaft 31 at the center of the tire tread in the cross-sectional shape.
4b, the cutter 10 is attached to the cutter holder 17 with a cutter clamp 20 with the cutter center line p inclined by θ with respect to the center axis of the cutter holder.

When machining the pattern groove 24c located symmetrically to the pattern groove 24b, if the cutter 10 is a double-edged type with blades 10a on both sides as shown in FIG. 4(A), a support rod (
Rotating the rotary shaft) 12 by 180 degrees and setting the direction of the cutter 10 in the exact opposite direction to that used when machining the pattern groove 24b, or setting the cutter holder 1 with the inclination of the cutter in the exact opposite direction.
It may be attached to 7. In addition, in the case of a cutter 10 having the blade portion 10a on only one side as shown in FIG. 4(b), a cutter with the cutter tilted in the opposite direction is used.

Note that the cutter lO is made by bending the cutter itself to a desired inclination as in the above embodiment, and fixing it by the holding groove 21 of the cutter clamp 20 and the cutter holder 17, which are symmetrically provided. As shown in FIG. 5, a symmetrical standard cutter 10 may be fixed at a desired inclination angle θ by the holding groove 21 of the asymmetrical cutter clamp 20 and the cutter holder 17. Angle α1. α2 is α1 × α, or α1>α2.

Furthermore, FIG. 6 shows another embodiment, in which a circular cutter clamp 20 is attached with a tightening screw 22 slidably inserted into a convex groove 25 of the cutter holder 17, and the cutter clamp 20 is attached around this tightening screw 22. These cutter clamps 20 are each provided with at least one cutter holding groove 21 on the back side. (The cutter clamp is shown in cross section in the figure.) When machining pattern grooves with a cross-sectional shape that has no inclination (perpendicular to the tire support axis), cutter holding grooves 21 of the left and right cutter clamps 20, 20 are shown in Figure 6 ( The cutter clamp 20 is rotated so that it is in a symmetrical position as shown in b), and the legs of the symmetrical cutter lO are held in the cutter clamp 20 by the tightening screws 22.
The cutter holder 17 clamps and fixes the cutter.

In addition, when machining pattern grooves with an inclination θ, the sixth
As shown in FIG.
and the cutter holder [7]. According to this embodiment, there is no need to replace the cutter clamp.

(Effects of the Invention) As described above, the present invention fixedly supports the cutter support device on the support arm in a direction perpendicular to the tire support shaft, and adjusts the cutter support device according to the inclination of the pattern groove to be machined on the cutter support device. Since the cutter is held at an angle, pattern grooves with different inclination angles can be machined without rotating the support arm, and the shaft for rotating the support arm of the cutter support device and its drive device This has the effect of making the entire device simpler.

[Brief explanation of the drawing]

FIG. 1 is a front view of essential parts showing an embodiment of the present invention, and FIG. 2 is a front view of a cutter support device, partially in section. Fig. 3 is an explanatory diagram showing the relationship between the pattern groove and the cutter, Fig. 4 is a side view of the cutter, Fig. 5 is a front view showing another embodiment of the cassette holder, and Fig. 6 is yet another cassette holder. FIG. 7 is a front view showing the conventional grooving device, and FIG. 7 is a side view showing the conventional grooving device. 3 is a tire support stand, 31 is a tire support shaft, 4 is a moving stand,
5 is a transverse table, 6 is a perpendicular table, 7 is an arm support shaft, 1O is a cutter, 11 is a support arm, I2 is a support rod, 13 is a cassette support frame, 17 is a cutter holder, 20 is a cutter clamp, 21 is a holding groove, 22 is a tightening screw, 24a, 2
4b and 24c are pattern grooves, and 25 is a convex groove. Patent applicant: Sumitomo Rubber Industries, Ltd. Yaskawa Sekisei Giken Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 [! l Figure 6 (a) (b)
Figure 7

Claims (1)

[Claims] A cutter support device including a tire support shaft that rotatably supports a tire, a cutter holder to which a cutter is attached, a transverse shaft that relatively moves the cutter support device in a direction parallel to the tire support shaft, and a transverse shaft. In the grooving device, the cutter support device is rotatably supported in a direction perpendicular to the tire support shaft, and the cutter support device is provided with a perpendicular axis at the center of the tread. A grooving device characterized by detachably holding a cutter that is inclined with respect to a cutter holder centerline according to an inclination angle between a line and a centerline of a pattern groove to be processed.