JP4531239B2 - Method and apparatus for winding core of power transmission belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a transmission belt in which a core wire is spirally wound around an upper surface of a cylindrical molding die, while an unvulcanized sheet body such as a rubber-equipped canvas or rubber sheet is put on the outer peripheral surface of the cylindrical molding die. More particularly, the present invention relates to a molding technique for preventing a defect in wrinkling of a transmission belt by preventing a bulging defect generated in the unvulcanized sheet body when winding a core wire in a spiral shape.
[Prior art]
The method of manufacturing a transmission belt in which the side of the product belt is not covered with a cover canvas is to form a cylinder by laminating unvulcanized sheet bodies such as canvas with rubber, stretch rubber layer and adhesive rubber layer on the cylindrical outer surface of the mold. After coating, a tubular vulcanized body obtained by winding a core wire as a tensile body in a spiral shape, and further vulcanizing and cooling through a molding step of laminating a compressed rubber layer, and then demolding from the mold ( (Referred to as a sleeve).
[0003]
In this invention, it is related with the method of winding the core wire which is a tensile body helically on the sheet | seat body laminated | stacked in the above-mentioned shaping | molding process. In this molding process, a core wire that is covered with the sheet body on the cylindrical outer surface is horizontally supported by the center axis of both side surfaces, and the cylindrical mold is rotated at a predetermined number of revolutions, and is drawn out with a predetermined tension. Is moved at a predetermined speed in the axial direction, and the core wire is spirally wound around the outer surface of the cylindrical mold (referred to as spinning).
[0004]
As for the spinning process, there is Japanese Patent Laid- Open No. 4-279323 according to the application of the present applicant. According to this, the automatic winding device has a touch pulley that guides the core wire fed out to the sheet body, and the tip of the core wire. It consists of a push roll to be installed and a pickup arm that cuts and clamps the core wire, and automatically installs and spins a rope (also called a core wire) on the cylinder without depending on the experience and skill level of the operator, Thereafter, an automatic rope winding device for cutting the rope was provided.
[0005]
[Problems to be solved by the invention]
However, the above-described automatic rope winding device according to the above-described prior art has a problem in that the product belt has a wrinkle of canvas on the appearance, and the automatic function is hindered. In the spinning of the sticky ribbed belt, it is necessary to add manpower, and there remains room for improvement.
[0006]
In view of these, in the spinning process, a rubber-clad canvas is tightly coated on the cylindrical surface of the mold, and the stretched rubber layer and the adhesive rubber layer are pressed and laminated in layers, but a predetermined tension is applied when winding the core wire. The unwrapped sheet body was compressed and absorbed by deformation, as the wound core wire partially cut into the sheet body so that the unwrapped core wire covered the upper surface of the unvulcanized sheet body with a narrow pitch. In addition, since the winding of the core wire is wound up from one end of the cylindrical sheet body to the other end, the bulge is formed on the circumference near the front in the process of the winding core wire region moving to the other end. Occurs 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, and the circumferential width is 20 to 40 mm and the raised height is approximately 5 to 10 mm in front of 10 to 30 mm from the winding end of the core wire.
[0007]
When the wire was further wound and the core wire proceeded to the other end, compression deformation increased, and the side slip of the cylindrical sheet body stopped, the core wire climbed over the swollen portion, and the canvas surface without a refuge was bent to generate wrinkles. This part was a vulcanized belt and had a defect in appearance, resulting in a problem with disposal.
[0008]
The present invention eliminates such quality problems that cause defects and manual labor to prevent defects, eliminates quality defects and eliminates labor, and improves conventional problems. An object of the present invention is to provide a core winding method and apparatus.
[0009]
[Means for Solving the Problems]
That is, in the method of claim 1 of the present application, while the mold having the sheet body laminated on the cylindrical outer surface is horizontally supported and rotated, the core wire fed out with a predetermined tension is moved in the axial direction, In the method of winding the core wire spirally around the outer surface of the mold sheet,
The pressing roll is pressed against a swollen portion of the sheet body generated in an unwrapped portion in contact with the spiral winding portion of the core wire, and the swollen portion is moved to the open end of the sheet body to escape. According to the method of claim 1, since the bulge of the sheet body covered with the mold can be pushed and compressed to the other end side where the winding of the core wire is not finished and the bulge is transitioned to be released to the open end. You don't have to run your heart on that bulge. Therefore, the product belt can prevent wrinkles and ensure the quality. In particular, a thin sheet such as a ribbed belt can be suitably used.
[0010]
In the method according to claim 2, the sheet is moved from the vicinity of the unwrapped portion in contact with the spirally wound portion to the other end of the sheet body that has not been wound to the end while being pressed by the pressing roll, The object is to repeat the reciprocation that moves away from the body and returns to the vicinity of the spiral winding portion and moves to the end while pressing against the outer surface of the sheet body at least once more. According to the method of claim 2, the bulge generated as a result of a new winding after being released by one movement can be similarly changed again to be sent to the open end. As a result, it is possible to prevent the occurrence of wrinkles by preventing the bulge from the sheet body that has been wound in the full width, and to ensure the quality.
[0011]
In the method according to claim 3 of the present application, the rotation axis of the pressing roll having a rotation axis that is downward and parallel to the rotation axis of the mold faces the mold rotating from below to the front surface. The open end side is lowered and inclined toward the upstream side of the rotation.
According to this method, when the sheet is pressed against the sheet body, the manner in which the pressing roll hits can be freely adjusted. In particular, the contact gap on the open end side of the pressure roll is increased by swinging the head toward the upstream side of rotation, that is, 2 to 7 degrees lower (see FIG. 3), and the gap with the outer surface of the sheet body is increased. A transitional action width that encourages outward escape while suppressing the bulge in the traveling direction is created, and the escape state becomes smooth.
[0012]
In the apparatus according to claim 4 of the present application, while the mold having the sheet body laminated on the cylindrical outer surface is horizontally supported and rotated, the core wire fed out with a predetermined tension is moved in the axial direction, and the mold is moved. In a device for spirally winding a core wire on the outer surface of the sheet body, a mold that can be rotated in a horizontally supported state,
A spinning pulley portion that draws and closes the drawn core wire away from the mold;
A pressing roll part capable of pressing a press roll supported elastically and elastically against a swollen part of a sheet body generated in an unwrapped part in contact with the spirally wound part of the core wire;
A shuttle actuating part for reciprocating the pressing roll part from the vicinity of the unwinding part in contact with the spiral winding part to the other end of the sheet body that has not been wound, and the pressing roll part of the sheet body of the mold A proximity separating drive unit that elastically presses and separates the swollen part ;
It is provided with. According to the apparatus of claim 4, the bulge generated in the sheet body placed on the mold can be repeatedly mechanically unmanned and reliably released to the other end side (open end) where the winding of the core wire is not finished. I can do it. Therefore, the occurrence of wrinkles can be surely prevented without any variation regardless of manpower, and the problems of quality defects and reduction of man-hours can be solved.
[0013]
The apparatus according to claim 5 of the present invention is the apparatus according to claim 4, which faces the mold rotating from the lower side to the front side, is positioned below the rotation axis of the mold and is parallel in both the horizontal and vertical directions. The rotation axis of the pressing roll having the rotation axis is inclined on the vertical plane with the open end side lowered toward the upstream side of the rotation. As a result, when the pressing roll tilted by lowering the open end side comes close to the mold, the first contact portion is the opposite opening end side of the pressing roll, and the opening end side of the pressing roll has an opening gap. Expands into a trumpet shape. Accordingly, it is possible to easily shift the angled bulging cross section of the sheet body toward the open end side of the mold so as to make a transition (see FIG. 6).
[0014]
The apparatus according to claim 6 of the present application is the apparatus according to claim 4 or 5, further comprising means for measuring the distance to the outer surface of the mold, and the shuttle operating speed of the pressing roll according to the mold diameter. Is variable. According to the apparatus of claim 6, the core wire is fed at a constant speed regardless of the size of the die, so that the small-diameter die has a larger core diameter than the large-diameter die. The traverse section that moves forward will increase its speed. Therefore, even in such a case, the shuttle operation can be supported by increasing the speed of releasing the bulge outward at a high speed determined in advance from the distance to the outer surface of the mold.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a transmission belt core wire winding method and apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 7, the automatic winding method of the core wire of the transmission belt is as follows. First, a rubber-equipped canvas H is placed in close contact with the cylindrical outer surface of the molding die, and the stretched rubber layer G1 and the adhesive rubber layer are covered on the outer surface. This is a method in which a sheet body S in which G2 is further overlapped and closely laminated is formed, and cores C serving as tensile members of the transmission belt are aligned on the outer surface thereof at a predetermined pitch and wound in a spiral and planar shape ( (See FIG. 3 perspective view).
[0016]
As the core C is spirally wound at a predetermined pitch from a predetermined end of the mold, as shown in FIG. 6 (a), approximately 10 to 30 from the position of the core being wound in the winding progress direction. In the vicinity of the millimeter front, the upper surface of the sheet body S swells in an annular shape on the circumference, and its cross-sectional shape is a mountain shape with a width of about 20 to 40 mm and a height of about 5 to 10 mm on the circumference. And is called a swollen portion F. This is a cause of defects in the product after vulcanization.
[0017]
As described above, the occurrence of the swollen portion F occurs when the cord C having tension is wound around the upper surface of the sheet S that is unvulcanized, thick, and easily deformed, while biting into the cross section of the sheet S. Since the sheet body S is compressed from the wound core C, and simultaneously the winding of the core C is wound up from one side, the evacuation area of the unvulcanized easily deformable sheet S is the unwrapped portion, that is, the winding progress direction. Become. At this time, the sheet S stacked in close contact with the cylindrical outer surface of the mold K is difficult to slip, and there is no escape place, and the sheet S is lifted and gradually bulges. As a result, in the process of increasing the bulge, the adhesion force to the outer surface of the mold cylinder overcomes the side slip and bends at the raised portion, resulting in defects in the appearance after vulcanization. Therefore, the method of the present invention is particularly effective for a ribbed belt having a thin sheet body S and low lateral rigidity.
[0018]
In order to prevent this swelling phenomenon, as shown in FIG. 6 (b), the sheet body S is lifted up and the swelling is gradually increased until the sheet body S is gradually swollen and loses its adhesion to the outer surface of the mold cylinder. By pressing with 4 to 25 kgf, it can be suitably guided to the open end as follows. That is, by pressing the pressure roll surface, which has an annular chevron-shaped cross-section of the swollen portion F, and is opened forward in a trumpet shape, it is suitably compressed from the crest of the swollen portion F toward the traveling direction, As shown in FIG. 6 (c), a peeling action can be applied to the front of the crest that is in close contact with the outer surface of the mold cylinder, so that the swollen portion F can be shifted to and moved to the open end side. 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.
[0019]
In the above-described relief operation, the swollen state is grasped in advance from the difference in conditions such as the thickness of the sheet S, the core wire tension, and the pitch, and the relief speed and the number of reliefs are determined based on this. It must be repeated at least 5-10 times. At the same time, as described above, the speed at which the core wire is drawn out is normally constant to stabilize the tension. Therefore, when the mold diameter is reduced, the core wire is wound and the core wire is moved toward the open end on the cylinder. Will also be faster. Therefore, it is necessary to speed up the escape operation speed. This will be described later in the description of the apparatus.
[0020]
Next, the structure of each part of the present invention in the transmission belt core winding device will be described with reference to FIGS. First, FIG. 2 shows a pressing roll section 7 that performs a shuttle motion, a proximity / separation driving section 8 that gives an operation to the pressing roll section 7, and a shuttle operating section 9 together with a mold diameter detecting section 10 arranged on the back of the molding machine. The mold diameter detecting unit 10 is installed so as to be orthogonal to the mold rotation axis on the same horizontal plane. The pressing roll unit 7 and the adjacent separation / separation driving unit 8 attached thereto are mounted on the sliding block 27 with the proximity / separation direction being horizontal and perpendicular to the axis from the position horizontal to the mold rotation axis. As shown in FIG. 3, the sheet body S is rotated 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 located in the front of FIG. 1 and is rotated with the rotation axis leveled and supported at both ends (see FIGS. 3 and 4 for the support state). A sheet body S is in close contact with and coated on the cylindrical outer surface of the mold K.
[0021]
The core C fed from above the die K to the spinning pulley 5 is positioned and guided by the spinning pulley 5 that is close to and away from the surface of the sheet S by the cylinder 45, and a predetermined one end of the sheet S surface. The tip of the core C is placed on the other end, moved to the other end portion at a predetermined speed, and wound in a spiral shape at a predetermined pitch. As shown in the figure, the spinning pulley 5 is mounted on a sliding block 38 and moved by the rotation of the ball screw 39, so that the spinning pulley 5 can be spirally wound at a predetermined pitch.
[0022]
Next, the pressing roll 7 that releases the swollen portion F generated in the sheet body S according to the present invention to the open end will be described in detail. This apparatus is shown in FIGS. 1 and 2, and a press roll section 7 (see FIG. 3) having a three-dimensional arrangement and tilting the rotation axis as described above, and a close separation that presses and separates the press roll section 7 against the mold K The driving unit 8 and the operating unit 9 for shuttle operation, and the mold diameter detecting unit 10 for measuring the outer diameter of the mold K are configured.
[0023]
First, as shown in FIG. 5, the pressing roll unit 7 is rotatably supported on a table 17 by a support bracket 16, and the support bracket 16 has a swing adjustment hole and is fastened on the table 17. In this case, it can be adjusted to swing 2-7 degrees. The table 17 is elastically supported by a coil spring 18 so that it can expand and contract at four points with respect to the operation plate 19 at the front end of the proximity / separation drive unit 8 (the table 17 and the operation plate 19 always expand and contract in parallel), and a cylindrical sheet The unevenness of the body S can be expanded and contracted. A urethane resin is lined on the outer surface of the pressing roll 15 to add wear resistance.
[0024]
The proximity / separation driving unit 8 is connected to the shuttle operating unit 9 (see FIGS. 1 and 2) by a support member 24. A cylinder 21 is mounted on the support member 24, and the guide rod 22 and the ball bearing 23 can be operated to extend and contract while suppressing vibration (see FIG. 3).
[0025]
As shown in FIG. 1, the shuttle actuating portion 9 is provided with two guide rods 29 and a ball screw shaft 28 for moving the sliding block body 27 located in the center of the transverse beam of the main body frame 2. The variable speed motor 30 disposed on the vertical beam transmits the rotation by the timing belt 31 to rotate the ball screw 28 forward and backward, thereby moving the sliding block body 27 freely in the left-right direction.
[0026]
Next, the mold diameter detection unit 10 of the mold K is shown in FIG. Although the purpose of use will be described later, it is mounted on the sliding block body 27 so that it can be expanded and contracted in the same plane and perpendicular to the rotational axis of the mold. When the mold is carried in and supported horizontally, the cylinder 36 extends to the outer surface of the end of the mold and hits, and the stop stroke is detected and stored in a reduced size. A resin rod 35 is fixed to the front end of the cylinder 36 to prevent damage when contacting the mold. The cylinder 36 can detect the stroke amount corresponding to the expansion / contraction position.
[0027]
Next, the control content of the above-described shuttle movement will be described with reference to FIG. The core C starts to wind from a predetermined die end, and the sliding block body 38 moves the spinning pulley 5 at a predetermined winding pitch to wind it in a spiral shape. At this time, the non-contact sensor 11 is mounted by a support member 33 that is fastened and extended to the sliding block body 38 that moves the spinning pulley portion 5. On the other hand, a reflective mark body 13 is provided on the upper surface of the sliding block body 27 for operating the shuttle of the pressing roll unit 7. The starting point of the shuttle operation of the pressing roll unit 7 is set so that the non-contact sensor 11 is at a position sensitive to the reflection mark body 13. The position where the pressing roll portion 7 starts to press the swollen portion F in the vicinity of the winding front of the core C is determined.
[0028]
Subsequently, when the reflection mark body 13 is sensed, the pressing roll unit 7 is pressed against the sheet body S by extension of the proximity / separation driving unit 8, and the aforementioned variable speed motor 30 that operates the sliding block body 27 is activated. When moving to the open end at a predetermined speed more than several times that of the spinning pulley 5 and kicking the limit switch 47 at the end, the variable speed motor 30 stops and the cylinder 21 shrinks. The pressing roll portion 7 is separated from the sheet body S and simultaneously returns to the winding pulley 5 on the winding side.
[0029]
During this process, the winding of the core S progresses, and the non-contact sensor 11 from the sliding block body 38 being wound detects the sliding block body 27 being turned over by the non-contact sensor 11 and the position thereof is detected. The above shuttle operation is repeated again.
[0030]
As described above, the purpose of detecting the mold diameter is usually to stabilize the tension of the core wire, so that the feeding speed of the core wire is the same speed. Varies with the winding pitch. Based on this, the shuttle operating speed of the pressing roll 15 that detects the mold diameter and releases the bulge is automatically adjusted by arithmetic control based on the detected stroke of the cylinder 36 so as to correspond to this.
[0031]
The embodiment is not limited to the above, and may be modified as follows, for example.
A press roll part is not specified to the position of this figure, and can be suitably arrange | positioned below.
2) The winding movement direction of the core wire and the winding rotation direction are not specified in this figure, and the reverse direction and reverse rotation embodiments can be changed as appropriate.
[0032]
【The invention's effect】
As described above, in the invention related to the core winding method and apparatus for the transmission belt according to claims 1 to 6 of the present application, according to the method of claims 1 to 3 and the apparatus of claims 4 to 6, A sheet that appears near the front of the core winding part that tends to occur when a core wire with a predetermined tension is spirally wound around a sheet body in which a mold is covered with a canvas and a stretched rubber layer and an adhesive layer are laminated. It was possible to eliminate defects in the appearance of the transmission belt caused by swelling of the body. In addition, since the manual work is done with a simple device, it can be reliably eliminated without relying on human hands, and the cost problem can be improved. In particular, it could be suitably carried out in forming a ribbed belt. In addition, by using a pressure roll, there is no adverse effect on the deformation of the sheet body, and it can be suitably formed with unevenness.
[0033]
According to the method of claim 3, by tilting the pressing roll, a trumpet-shaped gap is created on the contact surface between the cylindrical sheet surface and the pressing roll, and the swelling is favorably received and is peeled evenly on the rotating circumference. I was able to give the action to do. According to the apparatus of Claims 4-6, the same escape effect could be exhibited irrespective of the product size.
[Brief description of the drawings]
FIG. 1 is an overall rear view of a transmission belt core wire winding device according to the present invention.
FIG. 2 is a side view of FIG. 1, and is a cross-sectional view as seen from the direction XX.
FIG. 3 is a perspective view of a swollen portion of a sheet body and a press roll arrangement.
FIG. 4 is a perspective view of arrangement of a mold diameter detector and a pressure roll start sensor.
FIG. 5 is a detailed view showing a pressing roll part. It is a bulge part of a sheet | seat body, and a press roll arrangement | positioning perspective view.
FIGS. 6A and 6B are schematic views showing a transition of a bulging escape action and a gap between two cylindrical bodies intersecting and tilting at an open end; and FIG.
FIG. 7 is a configuration diagram of an unvulcanized sheet body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission belt core winding apparatus 5 Spinning pulley part 6 Spinning traverse part 7 Pressing roll part 8 Pressing roll proximity separation drive part 9 Pressing roll shuttle action | operation part 10 Type | mold diameter detection part 11 Non-contact sensor 15 Pressing roll 30 Variable speed motor S Sheet body C Core wire F Swelling part K Mold

Claims (6)

While the mold with the sheet body laminated on the cylindrical outer surface is horizontally supported and rotated, the core wire fed with a predetermined tension is moved in the axial direction to spiral the core wire to the outer surface of the mold sheet body. In the method of winding in a shape,
A transmission belt, wherein a pressing roll is pressed against a swollen portion of a sheet body generated in an unwrapped portion in contact with a spirally wound portion of a core wire, and the swollen portion is moved to an open end of the sheet body and escaped Core wire winding method.   After moving from the vicinity of the unwrapped portion in contact with the spirally wound portion to the other end of the sheet body that has not been wound to the end while being pressed by the pressing roll, the spirally wound portion is separated from the sheet body. 2. The method of winding a core of a transmission belt according to claim 1, wherein the reciprocating motion of returning to the vicinity of the belt and moving to the end while pressing against the outer surface of the sheet body is repeated at least once.   Facing the cylindrical sheet body rotating from the bottom to the front, the rotation axis of the pressing roll having a rotation axis that is below and parallel to the rotation axis is directed to the upstream side of the rotation on the vertical plane. The method of winding a power transmission belt core wire according to claim 2, wherein the open end side is lowered and inclined. While the mold with the sheet body laminated on the cylindrical outer surface is horizontally supported and rotated, the core wire fed with a predetermined tension is moved in the axial direction to spiral the core wire to the outer surface of the mold sheet body. A mold that can be rotated in a horizontally supported state in a device for winding in a shape,
A spinning pulley portion that draws and closes the drawn core wire away from the mold;
A pressing roll part capable of pressing a press roll supported elastically and elastically against a swollen part of a sheet body generated in an unwrapped part in contact with the spirally wound part of the core wire;
A shuttle actuating part for reciprocating the pressing roll part from the vicinity of the unwinding part in contact with the spiral winding part to the other end of the sheet body that has not been wound, and the pressing roll part of the sheet body of the mold A proximity separating drive unit that elastically presses and separates the swollen part ;
A device for winding a core wire of a transmission belt, comprising:   Facing the mold rotating from the bottom to the front, the rotation axis of the pressing roll having the rotation axis parallel to both the horizontal and vertical directions on the vertical plane is located below the rotation axis of the mold. The core winding device for a power transmission belt according to claim 4, wherein the open end side is lowered and inclined toward the upstream side of rotation.   6. The transmission belt according to claim 4, further comprising means for measuring a distance to the outer surface of the mold, wherein the shuttle operating speed of the pressing roll can be varied according to the diameter of the mold. Core wire winding device.

Images