JPS597078Y2 - Cutter for removing tire spills - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a tire spew cutter. To be more specific, the invention has a structure in which a protective guard is provided on a cutter shaped like a comb, and the cutter is shaped like a comb. One end of the protective guard is fixed to the support part of the cutter, the other end faces the tip of the cutter's blade with a slight gap, and the lower end is aligned with the lower end of the tip of the blade or Q. Approximately 20 mm located below the cutter blade and extending approximately along the extension line of the cutter blade.
This device is characterized by having an arm portion having a length of the above length.

The surface of the tire vulcanized by the vulcanization press has spews, which are elongated whisker-like protrusions of the rubber, formed by vent holes drilled in the mold to remove air between the vulcanization press mold and the tire surface. Formally imposing.

However, since these spews impair the appearance of the finished tire, for example, as shown in Figure 6, a so-called comb-shaped cutter with many V-shaped grooves cut in parallel is directly cut into the surface of the rotating tire. The spew is trimmed by moving it in the radial direction of the tire while making contact with the spew.

However, as mentioned above, with this type of comb cutter, the cutting edge is cut in a state where it is in direct contact with the tire surface. It may dig into the tire surface and damage the tire.

(2) Since lug tread pattern tires such as those shown in Fig. 7 have discontinuous lug grooves 9 in the shoulder portion 8, rib tread patterns or sidewalls that do not have such discontinuous lug grooves may be used. If the cutter used to remove spews is also used as is, it will not be able to cross the discontinuous lug grooves smoothly, and the cutter edge may dig into the tire surface and damage the tire. It is difficult to remove the spew from some types of tires.

(3) If the tip of the cutter's cutting edge breaks, it is necessary to trace the tire, and in some cases, it may be noticed only after the tire is mounted on the vehicle, making maintenance difficult.

It has the following problems.

The present invention was developed in order to eliminate the above-mentioned drawbacks when removing spews from the tire surface.The present invention was developed by attaching a protective guard to the tip of the cutting edge of the cutter used for cutting down the spew, and by attaching this protective guard to the cutter. We have discovered that these drawbacks can be eliminated by creating a U-shaped protective guard that has an arm with a length of about 20 mm or more that extends almost on the extension line of the blade, and we have developed the present invention. be.

The present invention will be explained below based on the drawings.

FIG. 1 is a side view of a spew cutting cutter with a U-shaped protective guard according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a bottom view, and FIG. 4 is a front view.

In Fig. 1, 1 is a cutter, 2 is a cutter support part, by which the cutter 1 is supported on a support rod so as to be swingable in the radial direction of the tire, and 3 is in a U-shape. It is a protective guard.

This U-shaped protective guard 3 has one end 4 as shown in FIG.
is fixed to the cutter support section 2.

The other end 5 faces the cutting edge of the cutter with a slight gap, and the lower surface of the lower end 5 is substantially on the same line as the lower surface of the cutting edge 6 of the cutter or is lower than the lower surface of the cutting edge. Q. The protective guard is positioned downward within a range of 5 mm, and furthermore, this protective guard is provided with an arm portion having a length of approximately 20 mm or more that extends approximately on the extension line of the cutter blade portion, so that the overall shape is approximately U-shaped. This is the state of affairs.

Figure 1 shows Q. This is a side view showing a state in which the lower surface of the tip 5 of the arm portion of the U-shaped protective guard is located below the lower surface of the cutter edge portion 6 within a range of 5 mm.

This is an essential condition when installing the U-shaped protective guard in the present invention. If installed, the spew will remain unpicked when spew is removed, which is not desirable.

Also, the lower end 5 of the U-shaped protective guard is placed on the upper surface from almost the same line.
If the lower surface of the tire is positioned, the object of the present invention cannot be achieved because it may dig into the tire.

The U-shaped protective guard 3 is made up of a plurality of pieces provided not only at both ends of the toothed cutter but also inside thereof.

The individual U-shaped protective guards may be arranged independently, or may be continuous at the tip, as shown in FIGS. 4 and 5, for example.

Since the U-shaped protective guard 3 was positioned only at both ends of the comb-shaped cutter having multiple cutting edges, there was a risk that the middle cutting edge of the comb-shaped cutter would dig into the tire surface during spew cutting. At least three locations at both ends and in the center are required.

The material of this U-shaped protective guard 3 is preferably iron.

Appropriately, the width W of one of the U-shaped protective guards 3 is approximately 7 mm.

The length l1 depends on the length of the cutter, but in the case of a cutter for spewing rib tread patterns or sidewalls, it is approximately 30 mm.

This U-shaped protective guard 3 is fixed at one end to the cutter support 2, and has a continuous integral structure at the other end, and the integral part comes into contact with the tire surface during spew cutting.

The cutting length GW of this integral part is approximately 10 to 20 mm. If it is less than 10 mm, there will be no gap for the spew to fit into the V-shaped blade, making it difficult to cut, and if it exceeds 20 mm, it will be wasteful due to the lug pitch. It is.

The length l2 from the tip of the U-shaped protective guard 3 to the rear end of the cutter 1 is greater than the maximum groove width of the shoulder of the lug tread pattern, and the height h of the U-shaped protective guard 3 is approximately It is 20 mm or more.

By having the arm portion 7 in this manner, there is no fear that the cutter blade edge will dig into the lug groove when spewing a lug pattern tire having lug grooves in the shoulder.

As described above, the tire spew cutting cutter of the present invention has a U-shaped protective guard having an arm portion 7 having a length l3 of approximately 20 mm or more and extending approximately along the extension line of the cutter blade portion. With this installation, spews can be removed not only from rib tread patterns and sidewalls, but also from tires with discontinuous lug grooves in a part of the shoulder, such as lug tread patterns, without damaging the tire surface. Moreover, even if the tread pattern changes, it is only necessary to replace the cutter with a cutter equipped with an appropriate protective guard, so one trimming machine can cut out the spews of many types of tires. It has great practical value.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the cutter of the present invention, Figure 2 is a partial plan view of the same, Figure 3 is a bottom view of the same, and Figure 4 is a bottom view of the same.
Figure 5 is a front view of the same as above, Figure 5 is a perspective view showing the condition of the force cutter and protective guard of the present invention, Figure 6 is a plan view of the comb cutter, and Figure 7 is a partially cutaway perspective view of the lug tread pattern tire. It is. 1...Cutter, 2...Support part, 3.
...Protection guard, 6...Cutter cutting edge,
7...Arm.

Claims (1)

[Scope of utility model registration request] One end is fixed to the support part of the cutter, the other end faces the tip of the blade of the cutter with a slight gap, and the lower end is on the same line as the lower end of the tip of the blade or Q. In a tire spew cutting cutter equipped with a protective guard located below 5 mm, an arm with a length of about 20 mm or more that extends so that the protective guard substantially coincides with the extension line of the cutter blade. A tire spew cutting cutter characterized by a U-shaped protective guard having a U-shaped protective guard.