JP2002130380A - Method of winding of core wire for transmission belt and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of winding of core wire for transmission belt and an apparatus therefor in which appearance defectiveness by wrinkles of the transmission belt can be eliminated by removing swelling of a sheet body appearing near front of a core wire installation portion susceptible to occur, when the core wire having a specified tensile force is wound spirally around the sheet body in which an extension layer and an adhesion layer are laminated on a canvas by which a metallic mold is covered at a forming step of the transmission belt. SOLUTION: The method comprises the step in which the swelling part F produced at the end portion of the winding part is dislodged toward the open end by compressing firmly with a pressing roll 15 and then released when winding the core wire C spirally around a tube-shaped sheet body S which covers the metallic mold K, wherein the simple and easy apparatus is used for releasing the swelling by shuttle operation of the pressing roll 15 without manual actuation with shuttle speed being altered by detecting the diameter of mold even when the diameters of the metallic mold are differed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention covers an outer surface of a cylindrical molding die with an unvulcanized sheet such as a canvas with rubber or a rubber sheet, and rotates the shaft to form a core wire spirally on the upper surface thereof. In connection with a method and a device for manufacturing a power transmission belt to be wound,
More specifically, the present invention relates to a molding technique for preventing a poor swelling occurring in the unvulcanized sheet body when a core wire is spirally wound and eliminating a poor wrinkling of the transmission belt.

[0002]

2. Description of the Related Art A method of manufacturing a power transmission belt in which a side surface of a product belt is not covered with a cover canvas is performed by laminating an unvulcanized sheet body such as a rubberized canvas, a stretched rubber layer and an adhesive rubber layer on a cylindrical outer surface of a molding die. After covering in a cylindrical shape, the core wire as a tensile body is spirally wound, and then subjected to a molding step of laminating a compressed rubber layer, vulcanized, cooled, and then released from the mold to obtain a cylinder. This is performed by cutting a vulcanized body (referred to as a sleeve) into a predetermined width.

[0003] The present invention relates to a method of spirally winding a core wire as a tensile member on a laminated sheet body in the above-mentioned molding step. In this molding step, a core having the sheet body covered on the cylindrical outer surface is horizontally supported by the central axes of both sides, the cylindrical die is rotated at a predetermined number of revolutions, and a core wire fed at a predetermined tension. At a predetermined speed in the axial direction, and the core wire is spirally wound around the outer surface of the cylindrical mold (called spinning).

As for the spinning process,
According to Japanese Patent Publication No. 4-279323 filed by the applicant of the present invention, an automatic winding device includes a touch pulley for guiding a core wire to be fed to a sheet body, a push roll for setting a tip of the core wire, and a core wire. A rope that cuts and clamps a rope, automatically installs a rope (also called a core wire) on a cylindrical body without relying on the experience and skill of the operator, spins, and then cuts the rope The present invention provides an automatic winding device.

[0005]

However, in the above-described automatic rope winding apparatus according to the prior art, there is a problem that the wrinkles of the canvas are generated in the appearance of the product belt and the automatic function is hindered. The spinning of a thin, sticky ribbed belt, which is uncured, requires manual intervention, leaving room for improvement.

[0006] In view of these, in the spinning process,
The cylindrical surface of the mold is tightly covered with a canvas with rubber, and the stretched rubber layer and the adhesive rubber layer are pressed and laminated tightly. Unwrapped sheet material was compressed and could not absorb deformation by winding the core wire partially into the sheet material so as to cover the upper surface of the sheet material at a narrow pitch. In addition, since the core wire is wound up from one end to the other end of the tubular sheet body, swelling on the circumference near the front of the tubular sheet body in the process of the winding core area progressing to the other end. Occurred on the surface of the body. The amount of swelling varies depending on the thickness of the sheet body, the tension and the pitch of the core wire, but the circumferential width is 20 to 40 mm 10 to 30 mm in front of the core winding end, and the swelling height is approximately 5 mm.
10 to 10 mm.

Further, when the core wire is further wound and the core wire advances to the other end, the compressive deformation increases, and the sideways sliding of the tubular sheet stops, the core wire runs over the bulging portion, and the canvas surface where there is no escape point is bent and wrinkles are generated. I let it. This portion has a problem in that the belt after vulcanization becomes wrinkles of poor appearance and involves disposal.

The present invention eliminates such a quality problem that causes wrinkle defects and a manual operation that prevents such wrinkle defects, and reduces the quality defects and eliminates the number of labor steps to improve the conventional problems. An object of the present invention is to provide a method of winding a transmission belt core wire and a device therefor.

[0009]

In other words, in the method according to the first aspect of the present invention, a mold in which a sheet body is laminated on a cylindrical outer surface is horizontally supported and rotated while being rotated with a predetermined tension. In the method of moving the wire in the axial direction and spirally winding the core wire on the outer surface of the sheet body of the mold, the pressing roll,
The present invention is characterized in that the swollen portion is moved to the open end of the sheet body and is released by pressing against the swollen portion of the sheet body generated at the unwound portion in contact with the spiral winding portion of the core wire. According to the method of claim 1, since the bulge of the sheet body covered on the mold is pressed and compressed to the other end side where the winding of the core wire is not completed, the bulge transitions, and the bulge can be sent to the open end. There is no need to let the cord run over the bulge. Thus, wrinkles can be prevented from occurring in the product belt, and quality can be ensured.
In particular, a thin sheet body such as a ribbed belt can be suitably used.

In the method according to the second aspect of the present invention, the portion from the vicinity of the unwound portion in contact with the spirally wound portion to the other end of the unwound sheet is moved to the end while being pressed by the pressing roll. Thereafter, the reciprocating motion of separating from the sheet body, returning to the vicinity of the spirally wound portion, and moving to the end while again pressing against the outer surface of the sheet body is repeated at least once. According to the method of the second aspect, the bulge generated due to the new winding progress after the release by one movement can be similarly shifted again and sent to the open end. As a result, swelling is prevented from the sheet body after full-width winding is completed, wrinkles can be prevented from occurring, and quality can be ensured.

In the method according to the third aspect of the present invention, the rotation axis of the pressing roll having a rotation axis that is lower and parallel to the rotation axis of the mold facing the mold rotating from below to the front. On a vertical plane, the open end is inclined downward toward the upstream side of rotation. According to this method, it is possible to freely adjust the contact of the pressing roll when pressed against the sheet member. In particular, the slope toward the upstream side of rotation,
By swinging down 7 ° (see FIG. 3), the contact gap on the open end side of the pressing roll becomes large, the gap with the outer surface of the sheet body widens, and escapes outward while suppressing the bulge in the traveling direction. The transition action width that promotes the release is created and the escape state becomes smooth.

In the apparatus according to the fourth aspect of the present invention, while a mold having a sheet body laminated on a cylindrical outer surface is horizontally supported and rotated, a core drawn out at a predetermined tension is moved in an axial direction. A mold that is rotatably supported in a horizontally supported state in a device for spirally winding a core wire around the outer surface of a sheet body of the die, a spinning pulley part that moves the fed core wire close to and away from the mold, and a core. The pressing roll portion that presses against the swollen portion of the sheet body that occurs at the unwound portion that contacts the spiral winding portion of the wire, and the pressing roll portion is not completely wound from the vicinity of the unwound portion that contacts the spiral winding portion. A shuttle operating unit for reciprocating to the other end of the sheet body and a proximity / separation driving unit for pressing the pressing roll unit against a mold to separate the pressing unit from each other. According to the device of the fourth aspect, the bulge generated in the sheet member covered with the mold can be reliably released mechanically unattended to the other end side (open end) where the winding of the core wire is not completed. I can do it. Therefore, the occurrence of wrinkles can be reliably prevented without variation without manual operation, and the problems of poor quality and reduction in the number of work steps can be solved.

According to a fifth aspect of the present invention, in the apparatus of the fourth aspect, facing the mold rotating from below to the front,
The rotation axis of the pressing roll, which is located below the rotation axis of the mold and has a rotation axis parallel to both the horizontal and vertical directions, is lowered on its vertical plane with the open end side toward the upstream side of rotation. It is inclined. Due to this, the pressing roll inclined downwardly at the open end side is such that the portion that comes into contact first when approaching the mold is on the side opposite to the open end of the pressing roll, and the open end side of the pressing roll has an opening gap. Spread like a trumpet.
Therefore, the chevron-shaped swollen cross section of the sheet body can be smoothly compressed toward the open end side of the mold to facilitate transition (see FIG. 6).

According to a sixth aspect of the present invention, in the apparatus of the fourth or fifth aspect, there is provided a means for measuring a distance to an outer surface of the mold, and the pressing roll of the pressing roll is provided in accordance with the diameter of the mold. The shuttle operation speed is variable. According to the apparatus of the sixth aspect, since the feeding speed of the core wire is normally fed at a constant speed irrespective of the size of the die, a small-diameter die has a larger core wire diameter during winding than a large-diameter die. The speed of the traversing part which performs the feeding movement increases. Therefore, even in such a case, it is possible to respond to the shuttle operation by increasing the speed at which the bulge is released outward at a high speed previously determined from the distance to the outer surface of the mold.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a transmission belt core winding method and apparatus according to the present invention; As shown in FIG. 7, a method for automatically winding a core of a power transmission belt is to first cover a cylindrical outer surface of a molding die with a rubber-made canvas H in close contact with a cylindrical shape, and to cover the outer surface with a stretched rubber layer G1 and an adhesive rubber layer. This is a method of forming a sheet body S in which G2 is further superimposed and closely laminated, and arranging a core wire C as a tensile body of the transmission belt on the outer surface thereof at a predetermined pitch, and spirally winding the sheet C in a planar manner ( FIG. 3 is a perspective view).

As the core wire C is spirally wound at a predetermined pitch from a predetermined end of the mold, as shown in FIG. The upper surface of the above-mentioned sheet body S rises annularly on the circumference in the vicinity of the front of 10 to 30 mm, and its cross-sectional shape is about 20 to 40 mm in width on the circumference and about 5 to 1 in height.
It has a chevron shape with a foot of 0 mm, and is called a bulging portion F. This causes wrinkles in the vulcanized product.

The occurrence of the swollen portion F is caused by the fact that the tensioned core C is wound around the upper surface of the uncured, thick and easily deformable sheet S as described above. The sheet body S is compressed from the core wire C wound while biting into the sheet, and at the same time, the winding of the core wire C is wound up from one side. The direction of travel. At this time, the sheet body S laminated in close contact with the outer surface of the cylinder of the mold K does not slip easily, so that there is no escape area and the sheet body S rises and gradually expands. As a result, in the process of increasing the bulge, the adhesive force to the outer surface of the mold cylinder bends at the rising portion over the side slip,
Wrinkles are poor in appearance after vulcanization. Therefore, the method of the present invention is particularly effective for a ribbed belt in which the sheet member S is thin and has less rigidity in the lateral direction.

To prevent this swelling phenomenon, FIG.
The sheet body S is lifted up and gradually swells, and the lifting portion is pressed with the pressing roll 15 with 4 to 25 kgf as soon as possible until the sheet S loses the adhesive force to the outer surface of the mold cylinder. It can be suitably guided. In other words, the pressure roll surface, which is formed by inclining the swollen portion F having an annular chevron-shaped cross section and opening its mouth forward like a trumpet, suitably applies compression from the crest of the swollen portion F in the traveling direction.
As shown in FIG. 6 (c), a peeling action is given to the front of the mountain closely contacting the outer surface of the mold cylinder, so that the swollen portion F can be shifted to the open end side and shifted. By sending this action to the open end, the swollen portion can be moved to the open end of the sheet body S as shown in FIG.

In the above-described release operation, the swelling state is previously detected from the difference in conditions such as the thickness, core tension and pitch of the sheet S, and the release speed and the number of times of release are determined based on this.
It must be repeated at least 5 to 10 times. At the same time, as described above, the feeding speed of the core wire is usually kept constant in order to stabilize the tension, so when the mold diameter becomes small, the core wire is wound around the core and the moving speed of the core wire toward the open end on the cylinder. Will also be faster. Therefore, it is necessary to increase the speed of the relief operation to correspond to this. This will be described later in the description of the apparatus.

Next, in the transmission belt core wire winding device,
The structure of each part of the present invention will be described with reference to FIGS. First, FIG. 2 shows a configuration in which a pressing roller portion 7 that moves in a shuttle motion, an approach / separation drive portion 8 that operates the pressing roll portion 7, and a shuttle operating portion 9 together with a die diameter detecting portion 10 are arranged on the rear surface of the molding machine. The mold diameter detector 10 is installed perpendicular to the same horizontal plane as the mold rotation axis. The pressing roll portion 7 and the proximity / separation drive portion 8 attached thereto are mounted on the slide block body 27 at a position perpendicular to the mold rotation axis, at right angles to the axis, and in the proximity / separation direction. As shown in FIG. 3, the sheet body S rotates from below toward the front surface of the pressing roll 15, and the pressing roll 15 is installed at an angle of 7 to 20 ° counterclockwise. The cylindrical mold K is positioned in front in FIG. 1 and has a rotation axis horizontal and is supported and rotated at both ends (see FIGS. 3 and 4 for the support state). The outer surface of the cylinder of the mold K is covered with a sheet S in close contact therewith.

Spinning pulley 5 from above mold K
The core C fed to the sheet body S is positioned and guided by the cylinder 45 by the spinning pulley part 5 which is close to and separated from the sheet body S surface, and is attached to a predetermined end of the sheet body surface by the core wire C.
Is moved at a predetermined speed to the other end and spirally wound at a predetermined pitch. The spinning pulley portion 5 is mounted on a sliding block body 38 as shown in the figure, and is moved by the rotation of a ball screw 39 so that a spiral winding can be performed at a predetermined pitch.

Next, the pressing roll 7 for releasing the swollen portion F generated in the sheet member S to the open end according to the present invention will be described in detail. This device is shown in FIGS. 1 and 2 and has a press roll 7 (see FIG. 3) which is three-dimensionally arranged and the rotation axis is inclined as described above, and the press roll 7 is pressed against a mold K and separated. Driving unit 8, operating unit 9 for shuttle operation, mold K
And a mold diameter detecting unit 10 for measuring the outer diameter of the mold.

First, as shown in FIG. 5, the pressing roll 7 is
The pressing roll 15 is supported on a table 17 by a support bracket 16.
The support bracket 16 has a swing adjustment hole in the support bracket 16, and is used when fastening on the table 17.
The swing of the angle can be adjusted freely. The table 17 is elastically supported by a coil spring 18 at four points with respect to an operating plate 19 at the front end of the proximity / separation driving unit 8 (the table 17 and the operating plate 19 always expand and contract in parallel). It can flexibly cope with unevenness of the body S. Pressing roll 15
The outer surface is lined with a urethane resin to provide abrasion resistance.

The proximity / separation drive unit 8 is connected to the shuttle operation unit 9 (see FIGS. 1 and 2) by a support member 24. The cylinder 21 is mounted on the support member 24, and the guide rod 22 and the ball bearing 23 suppress the run-out and can be extended and contracted (see FIG. 3).

As shown in FIG. 1, the shuttle operating portion 9 includes two guide rods 29 and a ball screw shaft 2 for moving the sliding block 27 located at the center thereof on the cross beam of the main body frame 2.
8, the rotation is transmitted by a timing belt 31 by a variable speed motor 30 disposed on a vertical beam of the main body frame 2, and the ball screw 28 is rotated forward and reverse, and the sliding block body 27 is rotated.
Is freely moved in the left-right direction.

FIG. 4 shows the die diameter detecting section 10 of the die K. Although this use will be described later, it is mounted on the sliding block 27 so as to be able to expand and contract in the same plane as the axis of rotation of the mold and at right angles. When the mold is carried in and horizontally supported, the cylinder 36 extends to the outer surface of the end of the mold and abuts, detects the stop stroke, and stores the reduced size. A resin rod 35 is fixed to the front end of the cylinder 36 to prevent damage when the mold contacts. The cylinder 36 is capable of detecting a stroke amount in accordance with the extension position.

Next, control contents of the shuttle movement will be described with reference to FIG. The core wire C starts winding from a predetermined die end, and the sliding block body 38 moves the spinning pulley portion 5 at a predetermined winding pitch and spirally winds. At this time, the support member 3 which is fastened to the sliding block body 38 for moving the spinning pulley portion 5 and protrudes.
At 3, the non-contact sensor 11 is mounted. On the other hand, the reflection mark 13 is provided on the upper surface of the shuttle block 27 for the shuttle operation of the pressing roll 7. The start point of the shuttle operation of the pressing roll unit 7 is set so that the non-contact sensor 11 is located at a position where the non-contact sensor 11 is sensitive to the reflection mark 13. The position where the pressing roll portion 7 starts pressing the swollen portion F near the front of the winding of the core wire C is determined.

Subsequently, when the reflection roll 13 is sensed, the pressing roll 7 presses against the sheet S by the extension of the proximity / separation driving unit 8, and the above-described variable speed motor 30 which operates the sliding block 27. Starts to move to the open end at a predetermined speed which is several times or more the speed of the spinning pulley 5, and the limit switch 47 at the end is moved.
When kicking, the variable speed motor 30 stops and the cylinder 21
The pressing roll portion 7 separates from the sheet member S and simultaneously rolls back to the spinning pulley portion 5 on the winding side.

During this process, the winding of the core wire S proceeds, and the non-contact sensor 1 from the sliding block body 38 during the winding is turned on.
The non-contact sensor 11 detects the sliding block 27 in which the 1 is flipping, and the shuttle operation is repeated again from that position.

As described above, the purpose of detecting the die diameter is as follows.
Normally, the feeding speed of the core wire is set to the same speed in order to stabilize the tension of the core wire, so that the moving speed of the spinning pulley portion 5 varies depending on the die diameter and the winding pitch. From this fact, the die diameter is detected, and the shuttle operating speed of the pressing roll 15 for releasing the swelling can be adapted to this.
It is automatically adjusted by arithmetic control based on the detected stroke of the cylinder 36.

The embodiment is not limited to the above, and may be modified as follows, for example. The pressing roll is not specified at the position shown in the drawing, but can be suitably arranged below. 2) The winding movement direction and the winding rotation direction of the core wire are not specified in this drawing, and the embodiments of the reverse direction and the reverse rotation can be appropriately changed.

[0032]

As described above, according to the invention relating to the method and the apparatus for winding the transmission belt according to claims 1 to 6 of the present application, the method according to claims 1 to 3 and the apparatus according to claims 4 to 6 are applied. According to the power transmission belt forming step, when a core wire having a predetermined tension is spirally wound around a sheet body in which a stretch rubber layer and an adhesive layer are laminated on a die in a molding process of a power transmission belt, a core wire winding portion which is likely to occur is formed. Poor appearance wrinkles of the transmission belt due to the swelling of the sheet appearing near the front could be eliminated. In addition, since manual work is performed with a simple device, it can be reliably eliminated without relying on humans,
The cost problem was also improved. In particular, the present invention was suitably implemented in forming a ribbed belt. Further, by using the pressing roll, there is no adverse effect on the deformation of the sheet member, and it is possible to suitably form the unevenness.

According to the method of the third aspect, by inclining the pressing roll, a trumpet-shaped gap is created in the contact surface between the cylindrical sheet surface and the pressing roll. The effect of peeling evenly could be given. According to the devices of claims 4 to 6, the same relief effect was exerted regardless of the product size.

[Brief description of the drawings]

FIG. 1 is an overall rear view of a transmission belt core wire winding device of the present invention.

FIG. 2 is a side view of FIG. 1 and is a cross-sectional view as seen from the direction of arrows XX.

FIG. 3 is a perspective view of a swollen portion of a sheet member and a pressing roll arrangement.

FIG. 4 is a perspective view of the arrangement of a mold diameter detection unit and a pressing roll start sensor.

FIG. 5 is a detailed view showing a pressing roll portion. FIG. 3 is a perspective view of a swollen portion of a sheet member and a pressing roll arrangement.

FIG. 6A is a schematic diagram showing a transition diagram of a bulging occurrence diagram, FIG. 6B shows a compression action, FIG. 6C shows a peeling movement, and FIG.

FIG. 7 is a configuration diagram of an unvulcanized sheet body.

[Explanation of symbols] The following is unnecessary if it is not in the drawing! DESCRIPTION OF SYMBOLS 1 Transmission belt core winding device 5 Spinning pulley part 6 Spinning traverse part 7 Pressing roll part 8 Pressing roll approach / separation drive part 9 Pressing roll shuttle operating part 10 Mold diameter detecting part 11 Non-contact sensor 15 Pressing roll 30 Variable speed motor S Sheet C Core wire F Bulging part K Mold

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 29:00 B29C 67/14 C F term (Reference) 4F205 AA45 AD08 AD15 AD16 AG16 HA22 HA37 HA47 HB01 HB12 HF05 HK25 HK29 HL03 HL12 HM13 HT06 HT22 4F213 AD05 AD13 AG16 WA41 WA53 WA55 WA97 WB01 WF05 WF23

Claims (6)

[Claims] 1. A mold in which a sheet body is laminated on a cylindrical outer surface,
In a method in which a core wire fed with a predetermined tension is moved in the axial direction while horizontally supported and rotated, and the core wire is spirally wound around the outer surface of the mold sheet body, a pressing roll is provided. A method of winding a core of a transmission belt, comprising pressing a swollen portion of a sheet body generated at an unwound portion in contact with a spirally wound portion and moving the swollen portion to an open end of the sheet body to escape. 2. A sheet is moved from the vicinity of the unwound portion in contact with the spiral wound portion to the other end of the unwound sheet while being pressed by a pressing roll to the end, and then separated from the sheet. The method according to claim 1, wherein the reciprocating motion of returning to the vicinity of the helical winding portion and moving to the end while pressing the outer surface of the sheet member again is repeated at least once or more. 3. A pressing roll having a rotation axis below and parallel to the axis of rotation of the pressing roll facing the cylindrical sheet body rotating from below to the front is rotated in a vertical plane. 3. The method of winding a transmission belt core wire according to claim 2, wherein the open end side is lowered and inclined toward the upstream side. 4. A mold in which a sheet body is laminated on a cylindrical outer surface,
While rotating horizontally while supporting and rotating, the core wire that is drawn out with a predetermined tension is moved in the axial direction, and it can be rotated while horizontally supported in a device that spirally winds the core wire around the outer surface of the mold sheet body A spinning pulley that moves the fed core wire close to and away from the die, and a pressing roll that presses against the bulge of the sheet that occurs in the unwound portion that comes into contact with the helically wound portion of the core wire. And pressing the pressing roll portion against the mold by pressing the shuttle operating portion and the pressing roll portion to reciprocate the pressing roll portion from the vicinity of the unwound portion in contact with the spiral winding portion to the other end of the sheet body that has not been wound. An apparatus for winding a core wire of a power transmission belt, comprising: a proximity / separation drive unit that separates the transmission belt. 5. A mold rotating from below to the front,
The rotation axis of the pressing roll, which is located below the rotation axis of the mold and has a rotation axis parallel to both the horizontal and vertical directions, is lowered on its vertical plane with the open end side toward the upstream side of rotation. 5. The core winding device for a transmission belt according to claim 4, which is inclined. 6. The apparatus according to claim 4, further comprising means for measuring a distance to an outer surface of the mold, wherein a shuttle operating speed of the pressing roll can be changed according to the diameter of the mold. 3. The core winding device for a transmission belt according to claim 1.