JP3828998B2 - Cord cutting method and apparatus for carcass member end of pneumatic tire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for cutting a cord at a carcass member end portion of a pneumatic tire, and more particularly, to a carcass member end of a pneumatic tire that efficiently performs discontinuation of a reinforcing cord at a splice portion. The present invention relates to a method and an apparatus for cutting a cord.
[0002]
[Prior art]
In general, the carcass layer of a pneumatic tire has a two-layer structure in which the splice portion is spliced so that about 2 to 5 reinforcing cords overlap each other, thereby causing a toroidal deformation in the tire molding process, etc. This prevents the splice part from separating.
[0003]
However, when the two-layer structure is formed by overlapping the splice parts in this way, the rigidity becomes larger than the other parts of the carcass layer, and as a result, the splice parts are not easily deformed, thereby forming a recess on the surface of the sidewall part. Occurred, and the tire appearance was impaired. In particular, in a pneumatic radial tire for a passenger car having a single-layer structure of the carcass layer, the appearance defect becomes remarkable.
[0004]
Therefore, as the above solution, the present applicant cuts at least one of the reinforcing cords in one of the two layers forming the splice portion at least at one position between the left and right bead cores, thereby making the one discontinuous. Has proposed a technique in which the rigidity of the layer is greatly reduced and the rigidity of the splice is reduced to the same level as other parts (Japanese Patent Laid-Open No. 59-59502).
[0005]
However, as described above, the work for discontinuating the reinforcing cords in the splice part is performed by an operator before the carcass member that has been cut into a predetermined length is wound around the forming drum, and an improvement thereof has been demanded. .
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a cord cutting method and apparatus for a carcass member end portion of a pneumatic tire, which can efficiently perform an operation of discontinuating a reinforcing cord in a splice portion.
[0007]
[Means for Solving the Problems]
The cord cutting method of the end portion of the carcass member of the pneumatic tire according to the present invention that achieves the above object includes lifting the tip end portion of the carcass member that has been cut in a fixed length by a lifting means, and advancing the cord cutting means having a cut amount limiting stopper. The reinforcing cord at the tip of the carcass member is cut while the cut amount limiting stopper is pressed against the tip of the carcass member.
[0008]
Further, the cord cutting device for the end portion of the carcass member of the pneumatic tire according to the present invention is provided with a lift means for lifting the tip end portion of the carcass member that is cut at a fixed length at the tip end portion of the conveyor, and a cutting position in the vicinity of the lift means. A cord cutting means that moves forward and backward between the standby position and a cutting amount restriction stopper, and the cord cutting means is pressed against the leading end of the carcass member at the cutting position. The reinforcing cord at the tip of the carcass member is cut.
[0009]
After lifting the leading end of the carcass member cut in this way by the lift means, the cord cutting means is advanced to cut the reinforcing cord at the leading end of the carcass member. Can be performed automatically and efficiently without human intervention. In addition, by cutting with the cut amount limit stopper pressed against the carcass member, it is possible to cut only the set length without incurring the disadvantage of significantly reducing carcass durability if cut too much. it can.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of a cord cutting device for a carcass member end of a pneumatic tire according to the present invention. 1 is a conveyor for conveying a long carcass member K, 2 is a standard cutting means for cutting the carcass member K into a standard, and 3 is a tip K′1 of a carcass member K ′ that has been cut into a standard. Lifting means 4 is a cord cutting means for cutting the reinforcing cord of the carcass member tip K′1 lifted by the lifting means 3. A regular cutting means 2 is arranged on the leading end side (conveying direction side) of the conveyor 1, and a lifting means 3 is disposed at the leading end of the conveying conveyor 1 on the conveying side from the regular cutting means 2. The cord cutting means 4 is installed in the vicinity of the conveyance direction side.
[0011]
The conveyor 1 is provided with a conveyor belt 11 wound left and right, and after a long carcass member K is conveyed in the horizontal direction on the belt 11, it is conveyed obliquely downward to the front end side. Yes.
The standard cut means 2 is installed on the conveyor 1 and is cut by a cutter (not shown) along the reinforcing cord by cutting a long carcass member K along a width direction of the carcass member K. The carcass member K ′ is formed.
[0012]
As shown in FIGS. 2 and 3, the lift means 3 is connected to the front ends of support plates 31 a and 31 b disposed in parallel with the conveyor belt 11 on both sides of the front end of the conveyor 1, with hinges 32 a and 32 b, respectively. A lift plate 33 swingable up and down is provided. The lift plate 33 is attached to the hinges 32a and 32b via attachment blocks 34a and 34b fixed to the upper surfaces on both sides in the transport direction. The support plates 31a and 31b are provided so as to project inwardly on the rear end portions of the auxiliary plates 13a and 13b attached to the support frames 12a and 12b at the front end portion of the conveyor 1 so as to protrude to the front end side. And supported by a support block W fixed on the support frames 12a and 12b.
[0013]
A U-shaped bracket 35 protrudes upward on one support plate 31b, and a swing cylinder 37 is swingable about the shaft members 36a and 36b between the brackets 35 via shaft members 36a and 36b. Is provided. The tip of the rod 37a of the swinging cylinder 37 protruding in the conveying direction is connected to a connecting plate 38 protruding from one mounting block 34b, and the lift plate 33 is moved to the rear end side by the operation of the swinging cylinder 37. 2 swings up and down between an inclined position (conveying position) indicated by a solid line in FIG. 2 and a horizontal position (cut position) indicated by a two-dot chain line, centering on the hinges 32a and 32b.
[0014]
As shown in FIG. 5, two cord cutting means 4 are installed on the left and right sides in a direction orthogonal to the conveying direction of the carcass member. As shown in FIG. 4, each cord cutting means 4 has a moving body 41 that can move in a direction perpendicular to the conveying direction of the carcass member. The moving body 41 has a support portion 42 having an L-shaped cross section. A pair of upper and lower blade portions 43, 44 that open and close are provided on the lower end side of the support portion 42. The lower blade portion 44 is configured as a fixed blade portion projecting from the lower end portion of the support portion 42 toward the rear in the conveying direction, and a cutting blade 44a is detachably attached to the upper end of the tip portion.
[0015]
The upper blade portion 43 is disposed adjacent to the lower blade portion 44, is connected to the lower blade portion 44 by a bolt 45 and a nut 46, and is disposed between the nut 46 and the lower blade portion 44. The spring 47 is always urged toward the lower blade portion 44 side. A cutting blade 43 a is detachably attached to the lower side of the distal end portion of the upper blade portion 43. The rear end portion of the blade portion 43 passes through a notch portion 42 a formed at the lower end portion of the L-shaped support portion 42 and extends rearward from the support portion 42.
[0016]
An opening / closing cylinder 48 having a rod 48a protruding downward is connected and supported on the rear surface of the support portion 42, and a rear end portion of the upper blade portion 43 is connected to a lower end portion of the rod 48a. By the operation of the opening / closing cylinder 48, the upper blade portion 43 is a moving blade portion that opens and closes with respect to the lower blade portion 44 around the bolt 45.
A cut amount limiting stopper 50 is attached to the lower end side of the support portion 42 by a bolt 49 with a knob. The stopper 50 is formed in a gate shape as shown in FIG. 6 and is disposed so as to accommodate the upper and lower blade portions 43 and 44 inside thereof, and is cut from the tip x of the lower blade portion 44. Accordingly, the distal end surface 50a is fixed to the support portion 42 at a position retracted by a predetermined length.
[0017]
A swing cylinder 51 is connected to the moving body 41, and the tip of a rod 51a protruding obliquely downward is connected to the support portion 42. By the operation of the swing cylinder 51, the support portion 42 is moved in the direction indicated by the arrow Z. By swinging, the upper and lower blade portions 43 and 44 can be moved back and forth between a cut position indicated by a solid line and a standby position indicated by a two-dot chain line in FIG.
The moving body 41 is supported by a support frame 61 and is screwed into a rotatable ball screw 62 extending in a direction perpendicular to the conveying direction of the carcass member, and is inserted through a guide bar 63 extending in parallel with the ball screw 62. Yes. As shown in FIG. 7, the screwing direction of the ball screw 62 is reversed on both the left and right sides, and the two moving bodies 41 and 41 are symmetrically centered on the center in the width direction of the carcass member to be conveyed by driving the motor 64. It moves so that it may approach and separate and can cut | disconnect the symmetrical position of a carcass member.
[0018]
Reference numeral 7 denotes a transfer plate that is connected to the lift plate 33 at an inclined position at substantially the same inclination angle, and 8 denotes a carry-in conveyor disposed below the transfer plate 7. The transfer plate 7 has first support arms 71a and 71b whose rear ends project from the inner ends of both auxiliary plates 13a and 13b, and both support projections 72a whose front ends project from the carry-in conveyor 8 side. It is fixedly supported by second support arms 73a and 73b supported horizontally by 72b. The carcass member whose end reinforcement cords are cut is transferred from the lift plate 33 via the transfer plate 7 to the carry-in conveyor 8 that carries the unillustrated molding drum, but the lift plate 33 and the carry-in conveyor Depending on the distance to 8, it can be omitted.
[0019]
The cutting method of the present invention can be performed as follows by the apparatus having the above configuration. First, the long carcass member K is transported on the conveyor belt 11 of the transport conveyor 1, and the leading end side thereof is cut by the standard cutting means 2 on the conveyor belt 11. The carcass member K ′ that has been cut to a predetermined length is further conveyed so that the tip of the carcass member K ′ comes to a position that slightly protrudes (for example, 3 to 4 mm) from the position of a predetermined cutting length (for example, 4 mm) from the lift plate 33. Then, the rod 37a of the swinging cylinder 37 of the lift means 3 is reduced, the lift plate 33 is moved upward with the rear end side as a fulcrum, and is cut from the inclined transport position to the horizontal cut position. The tip K′1 of the carcass member K ′ is lifted.
[0020]
Next, both cord cutting means 4 that have been moved in advance to positions corresponding to the two cutting positions of the bead, for example, two positions below the two beads, are activated. The rod 51a of the oscillating cylinder 51 is reduced, and the support portion 42 is pivoted about the connecting portion at the upper end, and the upper and lower blade portions 43 and 44 are advanced from the standby position of the two-dot chain line in FIG. Let The front end surface 50a of the stopper 50 presses against the front end of the carcass member K ′ and pushes the front end portion K′1 of the carcass member K ′. The tip of the carcass member K ′ may be tilted obliquely or deformed into a U shape or an inverted U shape within a range (approximately 3 mm) from the tip, but more than that, the stopper 50 To push the tip of the carcass member K ′. If the tip of the carcass member K ′ protrudes too much, it is pushed back. Therefore, the front end of the carcass member always abuts on the front end surface 50a of the stopper 50 to ensure a predetermined cutting length.
[0021]
With the stopper 50 pressed against the tip of the carcass member K ′ in this way, the rod 48a of the opening / closing cylinder 48 is reduced, the upper blade 43 is moved in the closing direction, and the tip K ′ of the carcass member K ′. 1 is cut by a predetermined cutting length so as to cut a reinforcing cord (not shown) extending in the width direction. For this reason, the operation of discontinuating the reinforcing cord of the splice part can be automatically and efficiently performed without the need for manual operation. In addition, since the cut amount limit stopper 50 is pressed against the carcass member K ′ for cutting, the cut amount is not insufficient or excessively cut (when the cut amount exceeds a predetermined length, the carcass durability is greatly reduced). The amount of cutting can be ensured reliably.
[0022]
After the cutting, when the rod 48a of the opening / closing cylinder 48 is extended to open the upper blade portion 43, the rod 51a of the swinging cylinder 51 is extended, and the support portion 42 is swung in the opposite direction to the above. The blade portions 43 and 44 are returned to the standby position indicated by the two-dot chain line in FIG.
Subsequently, the oscillating cylinder 37 of the lift means 3 is actuated, and the rod 37a extends to move the lift plate 33 downward with the rear end side as a fulcrum, and the inclined transfer position indicated by the solid line in FIG. Move to. The conveyor 1 is actuated, and the carcass member K ′ from which the reinforcing cord f at the tip K′1 is cut is carried out to the carry-in conveyor 8.
[0023]
In the present invention, in the above embodiment, two cord cutting means 4 are installed and the reinforcing cord of the carcass member tip K′1 is cut at two places. However, only one may be installed. In that case, it is preferable to arrange the carcass member front end portion K′1 so that the central portion in the width direction can be cut.
Further, although the long carcass member K is cut on the conveyor belt 11 of the conveyor 1, the carcass member K ′ that has been cut in advance is supplied to the conveyor 1 to reinforce the tip K′1. The code f may be cut.
[0024]
【The invention's effect】
As described above, the present invention lifts the tip portion of the carcass member that has been cut to a fixed length by the lift means, advances the cord cutting means having the cut amount limiting stopper, and presses the stopper against the tip of the carcass member. Since the reinforcing cord at the tip is cut, the work of discontinuating the reinforcing cord at the splice can be performed automatically and efficiently without manual operation, and a predetermined cutting amount can be reliably obtained. it can.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a cord cutting device at an end portion of a carcass member of a pneumatic tire according to the present invention.
2 is a view taken along the line AA in FIG. 3;
FIG. 3 is a plan view in which a part of the list means is omitted.
4 is an enlarged view taken along the line B-B in FIG. 5;
FIG. 5 is a side view of a coat cutting means.
FIG. 6 is a side view of a cut amount limiting stopper.
FIG. 7 is an explanatory diagram of a ball screw.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conveyor 2 Fixed cut means 3 Lift means 4 Code cut means 7 Delivery plate 8 Carry-in conveyor 11 Conveyor belt 33 Lift plate 37 Oscillation cylinder 43,44 Blade part 48 Opening and closing cylinder 50 Cutting amount restriction stopper 51 Oscillation cylinder K , K 'Carcass member K'1 Tip

Claims (6)

The tip of the cut carcass member is lifted by lifting means, the cord cutting means having a cut amount limiting stopper is advanced, and the cut amount limiting stopper is pressed against the tip of the carcass member. A cord cutting method for a carcass member end of a pneumatic tire for cutting a reinforcing cord at a tip. A cord cut having a lift means for lifting the leading end of the carcass member cut at a fixed length at the leading end of the transport conveyor, moving between a cutting position and a standby position in the vicinity of the lifting means, and having a cut amount limiting stopper A carcass for a pneumatic tire in which a cord is cut and the reinforcing cord at the tip of the carcass member is cut while the cord cutting means is pressed against the tip of the carcass member at the cutting position. Cord cutting device for member end. The cord cutting device for the end portion of a carcass member of a pneumatic tire according to claim 2, wherein a regular cut means for cutting a long carcass member into a regular size is provided on the conveyor. The cord cutting device for a carcass member end portion of a pneumatic tire according to claim 2 or 3, wherein the lift means has a lift plate that swings up and down around the rear end side at the front end of the conveyor. The cord cutting device for a carcass member end portion of a pneumatic tire according to claim 2, 3 or 4, wherein the cord cutting means has a pair of upper and lower blade portions to be opened and closed. The lower blade portion of the pair of upper and lower blade portions is configured as a fixed blade portion, and a movable blade portion that opens and closes the upper blade portion, and the incision amount limiting stopper is provided on the lower blade portion side by a predetermined length from the tip of the blade portion. The cord cutting device for the end portion of the carcass member of the pneumatic tire according to claim 5 provided at a retracted position.

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