JP3923326B2 - Cutting method of vulcanized tread member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of cutting a vulcanized tread member that has been continuously vulcanized and formed into a belt shape, and in particular, a tread pattern at a rear end portion and a tread pattern at a front end portion that have been cut first are aligned. To a method for cutting.
[0002]
[Prior art]
Conventionally, as a method of molding a rectified tire, a vulcanized tread member, which has been vulcanized and molded in a length corresponding to about 1 to 3 tires in advance and has a tread pattern formed on the surface, has a predetermined length. A method of cutting and joining to a prepared base tire is wound. In the cutting step, the tread member is cut so that the length of the tread member falls within a predetermined range, and the tread member is aligned so that the pattern block at the front end and the pattern block at the rear end are aligned. Disconnect. At this time, if the pattern at the front and rear ends shifts and a small divided block is formed at the joint, or the pattern block is divided at the groove, not only uneven wear is likely to occur, but peeling at the joint occurs. There was a fear.
Therefore, in order to align the pattern block at the rear end and the pattern block at the front end, the tread member is conveyed to a predetermined length by a conveyor or the like, and the operator marks the cut position with chalk or the like, and visually The tread member is cut by determining whether or not it is a proper cutting position. At this time, if the position is not the proper position, the tread member is manually moved to adjust the cutting position, and then the cutting position is reconfirmed for cutting.
[0003]
However, in the above conventional method, since the operator visually confirms the cutting position and manually adjusts the position of the tread member, not only the working efficiency is low, but also the positional accuracy of the cut portion is not sufficient. .
Accordingly, the applicant images the pattern block of the tread member that is scheduled to be cut and performs image processing, and the amount of deviation between the position of the captured pattern block and the pattern block of the planned cut position that is stored in the image processing apparatus in advance. And a method of cutting by adjusting the cutting position based on the amount of deviation (Japanese Patent Application No. 2000-28088). Specifically, as shown in FIG. 7, the actually captured image of the pattern block 2 is surrounded by a predetermined frame (search window 22B) for designating the pattern position, and the center of the search window 22B is defined. The amount of deviation from the center of the frame (pattern window 22A) for designating a preset cutting position displayed in the search window 22B is detected, and the tread member or the tread cutter is moved by the amount of deviation. And cutting the tread member. Thereby, the tread member can be cut accurately and efficiently.
[0004]
[Problems to be solved by the invention]
However, when the search window 22B is too wide, for example, when there are three or more pattern windows 22a, 22b, and 22c in the search window 22B, as shown in FIG. The amount of deviation from the pattern window 22b or the pattern window 22c, which is different from the pattern window 22a to which the amount of deviation should be compared, is detected, so that the cutting position of the tread member is shifted by one pitch or more. There was a fear.
Further, as shown in FIG. 8B, when the search window 22B is too narrow, the pattern windows 22p and 22q protrude from the search window 22B, and the detection accuracy of the shift amount decreases. In the worst case, the pattern window 22A does not exist in the search window 22B, and the amount of deviation may not be detected. In order to avoid the above situation, it is necessary to properly set the size of the pattern window 22A and the search window 22B (length in the window transfer direction). Inefficient.
[0005]
The present invention has been made in view of the conventional problems, and a method for accurately grasping the position of a tread pattern of a vulcanized tread member to be conveyed and conveying and cutting the tread member to an appropriate cutting position. The purpose is to provide.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the belt-shaped vulcanized tread member is transported by a predetermined amount from the cutting position, and then the photographing means integrally attached to the cutting device is used to cut the tread member. The tread member or the cutting device is moved while photographing the tread pattern, and the tread member is cut at a position where the photographed tread pattern image matches the pre-stored photographed tread pattern image. Thus, the tread pattern position of the tread member can be accurately grasped, and the tread member can be cut efficiently and accurately.
According to a second aspect of the present invention, in the method for cutting a vulcanized tread member according to the first aspect, in order to improve image detection accuracy, the tread member is pressed from above and below by a presser member. The tread member or the cutting device is moved.
According to a third aspect of the present invention, in the method for cutting a vulcanized tread member according to the second aspect, the upper and lower pressing members are both free rollers, and the pressing force of the pressing member is switched in two stages. The tread member can be pressed with a weaker pressure than when cutting, when the tread member or the cutting device is moved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an outline of a reforming tire molding apparatus according to this embodiment. In FIG. 1, 10 is a belt-shaped vulcanized tread member which is driven by a servo motor 11 and has a tread pattern formed on the surface. (Hereinafter referred to as a tread member) 1 is an unwinding conveyor for conveying 1, 20 is a cutting position detecting device including a camera 21 and an image processing device 22, and 30 is disposed in the middle of the unwinding conveyor 10, , A cutting device 40 for cutting the conveyed tread member 1, 40 is a length measuring conveyor that is arranged on the downstream side of the unwinding conveyor 10 and extends obliquely upward toward the base tire T that is rotatably supported. The servo motor Ph1 for driving the length measuring conveyor, Ph1 is installed at a predetermined feed distance from the rotary cutter 30R which is a cutting position, A photoelectric switch Ph2 for switching the conveyance speed of the red member 1 between two steps of high speed and low speed, Ph2 is arranged downstream from the photoelectric switch Ph1 by a predetermined distance, and pulse count for stepping the tread member 1 is started. The photoelectric switch 42 is a centering roller for correcting the positional deviation in the width direction of the tread member 1 being conveyed. Reference numeral 50 denotes a tread application device that includes free rollers 51 and 52 and applies the cut tread member 1 sent from the length measuring conveyor 40 to the outer peripheral surface of the base tire T.
[0008]
In this embodiment, as shown in FIG. 2A, a cutting device main body 33 including a rotary cutter 30R, a member presser 31 and an anvil 32 of the cutting device 30 is attached to a slide base 34. Is mounted on a gantry 36 which is a fixed base via an LM guide 35, and the ball screw 37a of the ball screw mechanism including a ball screw 37a and a nut member 37b is rotated by a moving motor 38 via a timing belt 38a. Accordingly, the cutting device main body 33 can be moved in the conveyance direction of the tread member 1.
In this example, the member presser 31 and the anvil 32 for pressing the tread member 1 from above and below are both free rollers, the pressing on the tread member 1 can be switched in two stages, and the cutting position can be changed. When the tread member 1 or the cutting apparatus main body 33 is moved for detection, the tread member 1 is pressed with a weaker pressure than when cutting.
In this example, the camera 21 is attached to one end of an L-shaped arm 23, and the other end of the arm 23 is horizontally connected to the cutting device main body 33 via an air cylinder 24 and a connecting member 25. After the tread member 1 is movably attached and conveyed to about one pitch before the planned cutting position, the rotary cutter 30R is moved in a direction perpendicular to the conveying direction of the tread member 1 (see FIG. 2B). 2 in a direction perpendicular to the paper surface of FIG. 2, and the camera 21 is moved by the air cylinder 24 to the fixed position of the rotary cutter 30 </ b> R in the cutting device main body 33, so It is possible to shoot.
In FIG. 1, for convenience of explanation, the image processing device 22 is attached to the connecting member 25. However, the image processing device 22 is actually separated from the cutting device 30, the servo motor 11, and the like. Installed in place.
[0009]
Next, a method for cutting a vulcanized tread member according to the present invention will be described with reference to the flowchart of FIG.
First, an outer peripheral length L ₀ of the base tire T is calculated by an outer peripheral measuring device (not shown) (step S10), and a necessary tread length L corresponding to the outer peripheral length L ₀ is set (step S11). For example, when the pattern pitch of the pattern block is P = 55 mm, the length of the tread member 1 for matching the pattern of the joint surface needs to satisfy L = N · P (N: natural number). At this time, if the outer peripheral length L ₀ of the base tire T is 3000 mm, 2970 mm and 3025 mm are candidates for the cutting position, but if the difference from the outer peripheral length L ₀ is about the same, tension winding is performed. Therefore, the tread length is set to L = 2970 mm and the tread member 1 is conveyed. In this example, the feed amount L is a feed amount with the origin directly below the rotary cutter 30R.
Next, the tread member 1 is transported by a length shorter than L, for example, a length L ₁ = L ₀ −P minus one pitch of the pattern block of the tread member 1 to be attached to the base tire T. Here, the length of the tread conveyed first is L ₁ = 3000−55 = 2945 (mm). In this example, the feed amount L ₁ is a feed amount with the origin directly below the rotary cutter 30R.
At this time, the tread member 1 is first conveyed at high speed (step S12), and when the tip of the tread member 1 reaches the photoelectric switch Ph1, the servo motor 11 of the unwinding conveyor 10 and the servo motor of the length measuring conveyor 40 are used. 41 is controlled to switch the conveyance speed from high speed to low speed (steps S13, S14). Further, when the tip of the tread member 1 reaches the photoelectric switch Ph2, the conveyance speed is switched from low speed to step feed (steps S15 and S16).
[0010]
Next, when the tread member 1 is conveyed to a position of L ₁ = 2945 (mm), the conveyance of the tread member 1 is stopped (step S17), the rotary cutter 30R is retracted, and the camera 21 is moved by the air cylinder 24. The rotary cutter 30R is moved to a fixed position to start photographing and pattern verification of the pattern block of the tread member 1 and restart the step feed of the tread member 1 (steps S18 and S19). At this time, the member presser 31 is lowered, and the tread member 1 is sandwiched between the member presser 31 and the anvil 32 and conveyed. In addition, the pressing pressure of the tread member 1 at the time of conveyance is set to a pressure that is weaker than that at the time of cutting and does not lift the tread member 1.
At the stage where the step feed of the tread member 1 is resumed, the position of the search window 22B for designating the pattern position of the tread member 1 designates the appropriate cut position of the tread member 1 as shown in FIG. Although the position is shifted from the position of the pattern window 22A, in the present invention, the tread member or the cutting device is moved while photographing the tread pattern at the planned cutting position of the tread member. The search window 22B moves in the direction of the pattern window 22A. Therefore, as shown in FIG. 4B, the time when the center of the pattern window 22A coincides with the center of the search window 22B is an appropriate cutting position. At this time, the conveyance of the tread member 1 is stopped. (Step S20), the camera 21 is retracted from the cutting device main body 33 by the air cylinder 24 and the rotary cutter 30R is returned to a fixed position, and then the tread member 1 is fixed by switching the pressing of the member presser 31 (Step S20). S21), the rotary cutter 30R is lowered to cut the rear end portion of the tread member 1 (step S22). Thereby, even if there is a feeding error during conveyance, the tread member 1 can be cut so as to eliminate the above-described deviation and align the position of the pattern block on the bonding surface. FIG. 5 and FIG. 6 are schematic views showing the appearance after joining the rib block and the pattern block when the pattern matching is not performed and when the pattern matching is not performed, FIG. As shown in a) and FIG. 6 (a), the patterns at the front and rear ends have shifted, but when the patterns are aligned, as shown in FIGS. 5 (b) and 6 (b), It was confirmed that the position of the pattern block can be accurately aligned.
The length of the cut tread member 1 is L ′ = 2970 mm, which is shorter by 30 mm than the outer peripheral length L ₀ = 3000 mm of the base tire T. Therefore, {(L ₀ −L ′) / L ₀ } × 100 = 1% tension winding.
[0011]
【The invention's effect】
As described above, according to the present invention, after the belt-like vulcanized tread member is transported by a predetermined amount from the cutting position, the photographing means integrally attached to the cutting device is used to determine the cutting position of the tread member. The tread member or cutting device is moved while photographing the tread pattern, and the tread member is cut when the pattern position of the photographed tread pattern matches the pre-stored photographed tread pattern image. As a result, the tread pattern position of the tread member can be accurately grasped, and the tread member can be cut efficiently and accurately.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a correction tire molding apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing a relationship between a cutting device and a camera at the time of positioning.
FIG. 3 is a flowchart showing a tread cutting method according to the present invention.
FIG. 4 is a diagram showing a cut position setting method according to the present invention.
FIG. 5 is a view showing a tread joining state according to the present invention.
FIG. 6 is a view showing a tread joining state according to the present invention.
FIG. 7 is a diagram illustrating a conventional method for setting a cut position.
FIG. 8 is a diagram illustrating a conventional method for setting a cut position.
[Explanation of symbols]
1 vulcanized tread member, 2 pattern block, 10 unwinding conveyor,
11 Servo motor, 20 Cutting position detection device, 21 Camera, 22 Image processing device, 22A Pattern window, 22B Search window, 23 L-shaped arm, 24 Air cylinder, 25 Connecting member, 30 Cutting device, 30R Rotary cutter 31 member presser, 32 anvil, 33 cutting device main body,
34 slide base, 35 LM guide, 36 mount base, 37a ball screw,
37b nut member, 38 motor for movement, 38a timing belt,
40 Length measuring conveyor, 41 Servo motor, Ph1 photoelectric switch for changing conveyance speed, Ph2 photoelectric switch for starting pulse count, 42 centering roller, 50 tread pasting device, 51,52 free roller, T tires.

Claims (3)

After the belt-like vulcanized tread member is conveyed by a predetermined amount from the cutting position, the tread member or the tread member or the tread member or A vulcanized tread member characterized in that the cutting device is moved and the tread member is cut at a position where the photographed tread pattern image coincides with a photographed tread pattern image stored in advance. Cutting method. 2. The method for cutting a vulcanized tread member according to claim 1, wherein the tread member or the cutting device is moved in a state where the tread member is pressed from above and below by a pressing member. Both the upper and lower presser members are free rollers, and the pressing force of the presser member can be switched in two stages. When the tread member or the cutting device is moved, the tread member is pressed with a weaker pressure than when cutting. The method for cutting a vulcanized tread member according to claim 2, wherein the vulcanized tread member is cut.

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