JPS625309Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tire tread spill removal device.

During the tire vulcanization process, the mold is equipped with numerous vent holes to prevent tire damage such as so-called bareness by discharging the surrounding air that exists between the tire and the mold. After the process is completed, whisker-like rubber protrusions called spews will appear on the surface of the tire's tread. Conventionally, such spills impair the commercial value of the tire, so it is common practice to use a spill trimming machine to remove them. The formed long tooth part 1 (for example, the tooth part length ₁ is about 110
Using a pair of cutters integrally equipped with long handles 2 with a tooth spacing _W1 of approximately 3.5mm), the handles 2 of the cutters are set at a constant angle with respect to the equatorial plane of the tire. The tread spew is removed by gradually lowering the tooth part 1 and moving it while bringing it into contact with the tread surface, but since the tooth part 1 is relatively long, it is difficult to polish the tooth part 1, resulting in poor workability. The disadvantages of not only poor polishing accuracy but also high cost remain unresolved.

As a result of intensive research to solve the above-mentioned drawbacks, the present invention was developed as a result of extensive research that allows the relatively short tooth section, which is conventionally used for removing spouts derived from the sidewall of tires, to be turned into a long handle. For example, if a cutter that is pivoted with both the front and rear swing angles of approximately 150° is used for resection of the tres de spew, the cutter's play due to the large swing angle will be too large, and the handle will continue to descend. The cutter remains in contact with a portion of the tread surface until the play disappears, and does not move on the tread surface, causing a large waste of movement of the cutter.The cutter is then found to be in a state of rest and does not move on the tread surface, resulting in a large amount of waste in the movement of the cutter, and the tread spew is efficiently removed. The idea was that the front swing angle of the cutter should be set to about 11° to 13° and the rear swing angle of the cutter should be set to about 9° to 11°.

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 4, a cutter 10 having relatively short comb-like teeth 11 (e.g., teeth 11
(length ₂ is about 40 mm) is installed in the pigeonhole groove formed in the holder 12, and fixed by applying the fixing bolt 13. A plurality of small through holes 14 are bored in the width direction of the cutter 10 in the rear part of the holder 12, and a stopper pin 15 is fitted into one of the small through holes 14, so that the cutter can be removed as the teeth are worn and polished. 10
The degree of protrusion from the holder 12 can be adjusted. The holder 12 is pivotably supported by a holder support 17 via a pivot 16, and as shown in FIG. 5, the front swing angle α of the cutter 10 is about 11° to 13°, preferably about 12°. To ゜,
Also, the rear swing angle β is approximately 9° to 11°, preferably approximately
Each is set at 10°. The front swing angle α refers to the reference cutter line S, which is perpendicular to the perpendicular line drawn from the pivot 16 of the cutter 10, and the cutter 10 swinging around the pivot 16 as a fulcrum, and the cutter holder support 17 The rear swing angle β means the angle formed by the swing cutter line S ₁ when it is resting on the front protrusion 18 (FIG. 5A), and the rear swing angle β means the perpendicular line drawn from the axis 16 of the cutter 10. The reference cutter line S is perpendicular to the reference cutter line S, and the swing cutter line when the cutter 10 swings about the pivot 16 and rests against the rear protrusion 19 of the cutter holder support part 17 (FIG. 5B). _S2 refers to the angle formed by the cutter holder 12, and the method of setting each swing angle α and β is such that when the cutter 10 swings about the pivot, the front or rear part of the cutter holder 12 is stopped. By appropriately selecting and designing the degree of protrusion (length) h ₁ and h ₂ of the front projection 18 and rear projection 19 of the holder support portion 17, each swing angle can be set. for example,
When the front and rear swing angles α and β are 12° and 10°, respectively, the length h ₁ of the front projection 18 of the holder support portion 17 is approximately 2.5 mm, and the length h ₂ of the rear projection 19 is approximately
It is 4.5mm. When the front and rear swing angles exceed about 13 degrees and about 11 degrees, respectively, the play of the cutter becomes so large that even if the handle 20 continues to descend during the spew cutting operation, the cutter 10 will not be able to touch a part of the tread surface. Temporary stagnation causes wasted movement, and
When the front and rear swing angles α and β are less than 11° and 9°, respectively, the length ₂ of the tooth portion 11 is relatively short, making it difficult to remove the spew within the necessary range to a sufficient degree. The holder support part 17 is supported by a fixing bolt 21 on the handle part 20. The handle 20 is pivotally supported by a lifting mechanism (not shown) at a desired angle of inclination (for example, 20 degrees) with respect to the equatorial plane of the tire, and the cutter 10 is always moved toward the tire by a biasing means (for example, a spring). The energization is such that the cutter 10 is properly pressed against the tread surface 22 during the cutting operation.

Incidentally, by setting the interval W ₂ between the teeth 11 to approximately 3.0 mm and making the narrow cut surface 23 sharper, the cutting precision of the spew can be further improved.

As explained above, the present invention has a structure in which it is supported on the handle with a relatively small play (swing angle), which not only makes it easier to polish the teeth, but also eliminates waste in the cutter's movement. Furthermore, the torsion spew can be excised with high precision, and the cost is low, which is an excellent practical effect.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional cutter for resection of tread sparrows, Fig. 2 is a front view of the tread sparrow resection device of the present invention, Fig. 3 is a plan view of the device of the present invention, Fig. 4 is a right side view, and Fig. 5 A is a partially enlarged view showing the front swing angle of the cutter of the present invention, and FIG. 5B is a partially enlarged view showing the rear swing angle. 10... Cutter, 11... Teeth, 12... Holder, 17... Holder support part, 20...
Handle.

Claims (1)

[Claims for Utility Model Registration] (1) A device for cutting out spills on a tread surface of a rotating tire by moving a cutter having teeth formed in the shape of a comb against the tread surface of a rotating tire, the device comprising: The holder with the cutter attached is pivotably supported, and the front swing angle α of the cutter is set to approximately 11° to 13°, and the rear swing angle β is set to approximately 9° to 11°. A tire tread spill removal device featuring: (2) The tire tread spill cutting device according to claim 1, wherein the cutter has a front swing angle α of about 12° and a rear swing angle β of about 10°. (3) The tire tread spill cutting device according to claims 1 and 2, wherein the cutter has a tooth interval _W2 of about 3.0 mm.