JPH11309787A - Method and apparatus for molding transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the point at issue such that the thickness of a rubber sheet is not stable because winding tension is not constant when the rubber sheet having a predetermined length is wound around a cylindrical mold by manual work and the terminal end part of the rubber sheet is not linearly abutted to the leading end part thereof and adhesive strength becomes irregular when the end parts of the rubber sheets are overlapped by manual work. SOLUTION: A mold length measuring roller 3 having an encoder attached thereto is brought into contact with the outer peripheral surface of a cylindrical mold 2 to be allowed to make a turn to measure and record the outer peripheral length of the mold and, thereafter, the cylindrical mold 2 is rotated while the cut leading end part of a rubber sheet 1 is pressed to the mold 2 by a pressure contact roller 4 and the rubber sheet 1 with a length calculated by subtracting a cut position constant from the outer peripheral length of the cylindrical mold 2 is wound to stop the mold and, after the terminal part of the rubber sheet 1 is cut, the rubber sheet 1 having the length corresponding to the cut position constant is wound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION For example, a method for manufacturing a rubber transmission belt such as a V-belt or a V-ribbed belt comprises a method of manufacturing an unvulcanized rubber sheet obtained by rolling unvulcanized rubber and a core material or the like which is subjected to a predetermined bonding treatment. An unvulcanized belt slab is formed by laminating and winding a cylindrical mold (this step is referred to as a forming step). This unvulcanized belt slab is vulcanized in a vulcanization step to produce a vulcanized belt slab. A power transmission belt is completed by a finishing step of cutting the vulcanized belt slab into a predetermined shape. The present invention relates to a method and an apparatus for forming a power transmission belt in the forming step.

[0002]

2. Description of the Related Art A conventional method for forming a power transmission belt is, for example, to prepare an unvulcanized rubber sheet by cutting it into predetermined dimensions.
It is manually wound around a cylindrical mold rotatably supported with its axis being horizontal. When winding by hand, first, a solvent is lightly applied to the front end of the unvulcanized rubber sheet, and pressed down and temporarily bonded to the outer peripheral surface of the cylindrical mold. Then, slowly rotate the cylindrical mold, rotate the cylindrical mold once, and press the end portion of the rubber sheet to the front end portion temporarily bonded, for example, by a pressing roller or the like to bond the two together. Form an unvulcanized belt slab.

[0003]

However, in the case of manual molding as described above, the cut rubber sheet is manually wound around a cylindrical mold. Since the elongation is not stable, the end of the rubber sheet may not evenly (linearly) abut the tip when the winding is completed. If this is forcibly corrected, the thickness of the rubber sheet will be uneven There is a problem. In addition, the work of overlapping and pressing with a hand roller or the like is also a manual operation, and there is a problem that the adhesive strength varies depending on the operator.

[0004] The present invention has been made in view of the above points, and has as its object to provide a molding method and a molding apparatus in which a leading end and a trailing end are uniformly and linearly joined.

[0005]

According to a first aspect of the present invention, there is provided a method for forming a power transmission belt, comprising: forming an unvulcanized rubber sheet (hereinafter simply referred to as a rubber sheet) into a predetermined length. A method of forming a power transmission belt that is cut and wound around a cylindrical mold, the mold measuring roller having an encoder being brought into contact with the outer peripheral surface of the cylindrical mold and rotating once to form an outer periphery of the cylindrical mold. After measuring and recording the length, the cut end of the rubber sheet is pressed against the cylindrical mold by a pressure roller, and then the cylindrical mold is rotated, and cut from the outer peripheral length of the cylindrical mold. The rubber sheet having a length reduced in the position constant is wound and stopped. Further, after cutting the terminal end of the rubber sheet, the rubber sheet having a length corresponding to the cut position constant is wound.

[0006] By measuring the outer peripheral length of the cylindrical mold in advance by using a mold measuring roller, basic data for setting the necessary length of the rubber sheet can be eliminated by eliminating the mounting mistake (size error) of the cylindrical mold. collect. A rubber sheet having a length obtained by subtracting the cutting position constant from the outer peripheral length of the cylindrical mold is wound around the cylindrical mold and stopped, and the end of the rubber sheet is cut straight. After cutting the end portion, a rubber sheet having a length corresponding to the cutting position constant is wound around to complete an unvulcanized belt slab. Here, the "cut position constant" refers to a length from a tangent line between the pressure roller and the cylindrical mold to a cut groove of the second cut support plate. When wound around a mold,
It refers to the length at which the tip and the end can be joined exactly.

According to a second aspect of the present invention, there is provided a transmission belt forming apparatus for cutting an unvulcanized rubber sheet into a predetermined length and winding the same around a cylindrical mold. Mold driving means for supporting and rotating horizontally, a heating table movable back and forth by means of forward and backward moving means, and capable of heating by mounting the rubber sheet on an upper surface, and a tip of the heating table A press roller having an axis parallel to the axis of the cylindrical mold, supported by a cutter support frame attached to the second base,
A cutter for cutting the rubber sheet placed on the heating table in a width direction thereof, and a mold length measurement supported by the cutter support frame and capable of coming into contact with and separating from the cylindrical mold and including an encoder. And a roller.

Since the cylindrical mold is horizontally supported and rotated by the mold driving means, it is easy to balance the left and right (width direction) heights when winding the rubber sheet. The heating table is heated by placing a rubber sheet thereon. This is because the rubber sheet needs to have a certain degree of flexibility in order to be wound around the cylindrical mold, and the unvulcanized rubber becomes too hard in winter and may not easily fit into the cylindrical mold. The heating table can be moved back and forth by means of the back and forth moving means, and the pressure roller supported at the tip thereof is brought into contact with the cylindrical mold,
Can be separated. This is because the rubber sheet is pressed against a cylindrical mold and wound. Here, "forward" refers to a direction approaching the cylindrical mold, and "rearward" refers to a direction away from the cylindrical mold.

The pressure roller, which is rotatably attached to the tip of the heating table, has an axis parallel to the axis of the cylindrical mold. it can. The cutter cuts the rubber sheet placed on the heating table at its tip and end in the width direction. Since the cutter is supported by the cutter support frame attached to the second base, the cutting position of the rubber sheet can be relatively changed by moving the heating table, and the tip and the end of the rubber sheet can be changed. Can be cut. The heating table is retracted to cut the end of the rubber sheet, and the heating table is advanced to cut the end of the rubber sheet.
Further, when cutting, similarly, by lowering the sheet fixing plate supported by the cutter supporting frame so as to be able to move up and down and fixing and cutting the rubber sheet, more stable cutting can be performed.

The mold length measuring roller is provided with an encoder capable of coming into contact with and separating from the cylindrical mold. The mold measuring roller is brought into contact with the cylindrical mold, and when rotated in synchronization with the rotation of the cylindrical mold, the rotation is counted by an encoder to measure the outer peripheral length of the cylindrical mold. This prevents the mounting mistake of the cylindrical mold and sets the winding length of the rubber sheet.

According to a third aspect of the present invention, there is provided an apparatus for forming a power transmission belt, which is rotatable between the front side and the lower side of the pressure roller with the axis of the pressure roller as an axis, and the first surface is formed on the upper surface.
A turning frame to which a cut support plate is attached, and a sheet pressing plate supported at the end of the turning frame in parallel with the axis of the pressing roller are provided.

Since the first cut support plate is provided on the upper surface, when cutting the leading end of the rubber sheet, the turning frame is turned forward to hold it horizontally, and the rubber sheet is pinched in cooperation with a sheet fixing plate described later. Improve cutting accuracy of rubber sheet by fixing. After cutting the rubber sheet, the pressure roller is pressed against the cylindrical mold while the rotating frame is swung downward, and the cylindrical mold is rotated to wind the rubber sheet around the cylindrical mold. Subsequently, the revolving frame is pivoted forward to press the sheet pressing plate against the position where the end of the rubber sheet of the cylindrical mold is wound, and press the end of the rubber sheet.

In a power belt forming apparatus according to a fourth aspect of the present invention, a sheet is provided at a leading end of a frame which has a turning shaft behind the pressing roller and is capable of turning from above to the front of the pressing roller. A tip bending plate is provided.

As described above, the rubber sheet having a cut end has considerable rigidity, and after cutting the end, the rubber sheet may be projected horizontally. In order to press the rubber sheet onto the cylindrical mold while the above-mentioned sheet pressing plate is turned downward, the sheet tip bending plate is turned forward of the pressing roller, and the end of the rubber sheet is formed into a cylindrical shape with the pressing roller. Press down between molds.

According to a fifth aspect of the present invention, in the power transmission belt forming apparatus, the heating table is attached to the cutter supporting frame so as to be movable up and down, and the heating table is attached to an upper surface of the sheet fixing plate. An upper portion supported by a second base that reciprocates between a position where the second cut support plate is located below the sheet fixing plate and a position where the first cut support plate is located below the sheet fixation plate. A cylinder, a lower cylinder supported by a first base for moving the second base back and forth to press or separate the pressure roller against the cylindrical mold, and a cylindrical mold for the mold measuring roller; Device moving means for moving the first base to a position where the first base can be brought into contact with the outer peripheral surface of the first base.

A cutter capable of traveling in the width direction of the rubber sheet and perpendicular to the side thereof is mounted on a cutter support frame supported by the second base, and the first cutter support plate is located at the traveling position to position the rubber sheet. The leading end is cut, and the second cutter supporting plate is supported at the running position to cut the end of the rubber sheet. The upper cylinder (moving means of the heating table) supported by the second base moves the heating table so that the ends of the rubber sheet are located at these positions. The lower cylinder (moving means of the second base) supported by the first base further moves the heating table moved forward by the upper cylinder further forward in order to wind the rubber sheet around the cylindrical mold. Then, a pressure roller rotatably attached to the front end is pressed against a cylindrical mold. After the work is completed, they are separated. The device moving means is a type of the cylindrical mold, that is, by changing the outer diameter of the cylindrical mold,
The heating table and the first base supporting the second base are moved back and forth so that the mold length measurement roller and the pressure roller supported by the cutter support frame can contact the outer peripheral surface of the cylindrical mold. I do.

According to a sixth aspect of the present invention, in the power transmission belt forming apparatus, the lower cylinder is advanced to abut the cylindrical mold with the front end of the rubber sheet sandwiched in front of the pressure roller. A fixed-size retreating means for retreating a predetermined distance.

Normally, in order to temporarily adhere the tip of the diagonally cut rubber sheet to the cylindrical mold, it is necessary to press the pressure roller until it comes into contact with the cylindrical mold. However, if the cylindrical mold is rotated as it is, the rubber sheet may be crushed to change the thickness. In order to prevent this, it is necessary to rotate the cylindrical mold while maintaining a gap by the thickness of the rubber sheet. Then, after pressing the pressure roller with the lower cylinder and temporarily bonding the rubber sheet, the gap corresponding to the thickness of the rubber sheet is retracted by the fixed-size retracting means to form a necessary gap.

According to a seventh aspect of the present invention, in the power transmission belt forming apparatus, the heating table includes an air slide. The unvulcanized rubber sheet has an adhesive property to the iron plate, and particularly when heated, increases the adhesive property, so that it is difficult to slide and move to wrap it around a cylindrical mold. Therefore, movement is facilitated in a state where the rubber sheet is floated by the air slide.

[0020]

FIG. 1 is a front view showing the entire molding apparatus according to this embodiment. FIGS. 2, 3 and 4 show a procedure for winding a rubber sheet using the apparatus shown in FIG. FIG. The power transmission belt forming apparatus of the present invention is shown in FIG.
As shown in the figure, the mold driving means 20 rotatably supports the cylindrical mold 2, and the rubber sheet 1 is horizontally supported and heated, and can be moved back and forth before cutting the end and sending it forward. Heating table 5, cutter 6, mold measuring roller 3
And a cutter support frame 19 that supports the sheet fixing plate 23.

The mold driving means 20 supports one end of the cylindrical mold 2 horizontally and rotatably by supporting means (not shown). The other end of the cylindrical mold 2 is supported by a pair of mold support frames 22 that are pivotable about the pivot shaft 21 and have a support at the top.

The heating table 5 has a heating plate (not shown) and an air slide (not shown) on the upper part, and a plurality of meandering prevention rollers 24 for preventing meandering of the rubber sheet are attached to the side.
A pressure roller 4 having an axis parallel to the axis of the cylindrical mold 2 is rotatably supported at the front of the heating table 5 (the end facing the cylindrical mold 2). A cylindrical mold 2 is attached to the tip of a revolving frame 30 that can revolve between the front and the lower side with the axis of the pressure roller 4 as the axis.
Is attached to the sheet press plate 7 parallel to the axis. The end portion of the rubber sheet 1 described later is
It is pressed against the tip of the previously wound rubber sheet 1. A first cut groove 31 is provided on the upper surface of the revolving frame 30.
And a first cut support plate 15 having Rubber sheet 1
Used to cut the tip of the. In addition, this first
The cut groove 31 is provided at a predetermined angle with respect to the surface of the first cut support plate 15. This is to increase the area of adhesion to the end of the rubber sheet 1 described below.

The bent sheet 8 at the front end of the sheet is provided with a plate-like body curved downward at the front end thereof, and is provided with a frame 34 rotatably supported by the frame of the heating table 5 so as to approach the rear of the pressure roller 4. It is pivotable from above the pressure roller 4 to the front thereof. The turning shaft 34 is connected to the air cylinder 32 attached to the frame of the heating table 5.
Activated by After cutting the front end of the rubber sheet 1, the front end bending plate 8 is turned to the front of the pressure roller 4 to bend the front end of the rubber sheet 1 forward of the pressure roller 4. Further, a sheet holding roller 33 is provided on the upper surface of the heating table 5 at the rear of the frame 34 to hold the rubber sheet 1 and prevent the rubber sheet 1 from floating during the movement, and is attached to the frame of the heating table 5 as necessary. Up and down by the air cylinder. The upper surface of the heating table 5 and the sheet pressing roller 3
The second cut support plate 16 having the second cut groove behind 3
Is installed. At this position, the end of the rubber sheet 1 is cut. The cutting is performed at a predetermined angle with respect to the upper surface of the rubber sheet 1, and the adhesion with the tip of the rubber sheet 1 on the outer peripheral surface of the cylindrical mold 2 is improved.

The heating table 5 includes a pressing roller 4 and a sheet pressing plate 7 attached to the
Is brought into contact with and separated from the cylindrical mold 2 by the procedure described below. First, the heating table 5 is connected to the second
The second base 1 is supported slidably back and forth on the base 18.
8 is moved by an upper cylinder 11 attached to the upper cylinder 8. The moving range is the first range provided on the heating table 5.
A position (also referred to as p-1) where the cut support plate 15 is located below the sheet fixing plate 23 described later, and a position where the second cut support plate 16 is located below the sheet fixing plate 23 similarly.
(also referred to as p-2).

The second base 18 includes a linear guide 36
Is slidably supported on the first base 17 through the
It is moved by the lower cylinder 12 supported by the first base 17. The moving range is such that the pressure roller 4 at the front end of the heating table 5 at the position of p-2 is further brought into contact with the outer peripheral surface of the cylindrical mold 2 supported by the mold driving means 20. Move up to Thereby, the front end of the rubber sheet 1 pressed and bent to the front of the pressure roller 4 is pressed against the cylindrical mold 2, and the rubber sheet 1 is wound by rotating the cylindrical mold 2 with the pressure roller 4 pressed. . Separate after winding is completed.

The first base 17 is further moved back and forth by the device moving means 13. The device moving means 13 includes:
The first base 17 is moved by a device moving motor 37 supported on a base (not shown) via a ball screw 38 similarly supported on the base (not shown). This movement adjusts the reference position in response to the change in the outer diameter of the cylindrical mold 2 depending on the type and size of the product. That is, it is designed such that the position of the cylindrical mold 2 shown by the solid line is the minimum diameter, and can be changed to the size of the cylindrical mold 2 'shown by the virtual line.

A fixed size retreating means 14 is provided between the first base 17 and the second base 18. The fixed-size retreat means 14
The second base 18 is urged rearward with a pressure smaller than the pressing pressure of the lower cylinder 12. After the tip of the rubber sheet 1 is pressed against the cylindrical mold 2 by the lower cylinder 12, when the pressure of the lower cylinder 12 is reduced to less than the pressing pressure of the fixed-size retreating means 14, the second base 18 is moved by a predetermined distance. Only retreat. In this example, the predetermined distance is the rubber sheet 1
Is slightly narrower when the thickness is 3.8 mm.
0 mm. This is because when the cylindrical mold 2 is rotated while the pressure roller 4 is pressed down by the lower cylinder 12, the rubber sheet is rolled and its dimensions change.

The cutter 6 is supported by a cutter support frame 19 attached to the second base 18 and cuts the rubber sheet 1 placed on the heating table 5 at a predetermined position in the width direction. The cutter 6 is supported by the cutter support frame 19 via a traveling unit that travels in the width direction of the rubber sheet 1 (not shown), and is mounted on the first cut support plate 15 or the second cut support plate 16 to fix the sheet. Board 2
Cut the tip or end of the rubber sheet 1 fixed by 3. The cutter 6 is mounted to be inclined with respect to the surface of the rubber sheet 1 and is designed so that the rubber cut surface is widened to improve the adhesion. The long rectangular sheet fixing plate 23 is supported by the cutter support frame 19 so as to be able to ascend and descend, and by descending and pressing the rubber sheet 1 at a position close to the cutter groove, the linearity of the cut surface of the rubber sheet 1 is improved. Secure. This is for improving the dimensional accuracy of the rubber sheet 1.

The mold length measuring roller 3 is supported by the cutter supporting frame 19 via the lifting frame 40 and is raised and lowered by a lifting motor 46. The tip of the mold length measuring roller 3 is a rotatable roller, and is lowered to move down the cylindrical mold 2.
The cylindrical mold 2 rotates while measuring its outer peripheral length by rotation of the cylindrical mold 2. The mold length measuring roller 3 is provided with an encoder to measure and record the measured outer peripheral length.
Based on this measured value, the length of the rubber sheet 1 to be wound around a cylindrical mold 2 described later in detail is set.

The function of the forming apparatus has been supplementarily described in the description of the forming apparatus. The forming procedure of the transmission belt by the forming method of the present invention will be described with reference to FIGS. FIG.
4A shows a state in which the tip of the rubber sheet 1 is cut by the cutter 6, and thereafter, as shown in FIG. 1 shows a procedure up to a state where the sheet pressure bonding plate 7 approaches the end joining position.

Before starting the operation, as shown in FIG.
, The heating table 5 is retracted, the pressure roller 4 is separated from the cylindrical mold 2, and the first cutter support plate having the first cut groove 31 while horizontally supporting the revolving frame 30 is provided. 15 is located below the sheet fixing plate 23. In the first step of the molding procedure, the rubber sheet 1 is placed on the heating table 5 and heated to a predetermined temperature. The heated rubber sheet 1 moves until the distal end thereof is positioned forward of the first cut groove 31. Then, the sheet fixing plate 23 is lowered to fix the rubber sheet 1,
The cutter 6 is moved along the first cut groove 31 to cut the tip of the rubber sheet 1. The rubber sheet 1
Is previously cut to a length obtained by adding a cutting margin (about 45 mm) to the circumference of the mold. Further, since an air slide is prepared on the heating table 5, the worker can
Can be easily moved along the meandering prevention roller 24 in a state in which it is raised.

In the second step, as shown in FIG. 2B, the turning frame 30 is turned 90 ° in the direction of the arrow x, and the sheet tip bending plate 8 is turned in the same direction so that the tip of the rubber sheet 1 is turned. It is pushed down to the front of the pressure roller 4 (the position in contact with the cylindrical mold 2). This is because when the rubber sheet 1 is hard, it may not hang down sufficiently.

In the third step, the first base 17 is moved forward by a distance designed by the outer diameter of the cylindrical mold 2 through the ball screw 38 by the apparatus moving motor 37 shown in FIG. As shown in (c), the cutter is lowered by a lifting motor 46 (see FIG. 1) via a lifting frame 40 supported by the cutter support frame 19 (see FIG. 1).
The mold measuring roller 3 is brought into contact with the cylindrical mold 2. After the cylindrical mold 2 is rotated once in the direction of arrow z to accurately measure its outer peripheral length, the mold measuring roller 3 is raised. An encoder (not shown) is attached to the mold length measuring roller 3, and a pulse generated by rotation of the mold length measuring roller 3 is taken in to calculate the outer peripheral length of the cylindrical mold 2. Based on this, the length of the rubber sheet 1 to be wound is calculated.

In the fourth step, as shown in FIG. 3D, the lower cylinder 12 (see FIG.
Is advanced in the direction of arrow u, and the tip of the rubber sheet 1 bent in front of the pressure roller 4 is pressed against the cylindrical mold 2. In this position, the second cutter support plate 16 is located below the sheet fixing plate 23.

In the fifth step, as shown in FIG. 3 (e), the rubber sheet 1 is pressed against the cylindrical mold 2 by the lower cylinder 12, and then the pressing pressure is reduced, so that the fixed-size retracting means 14 (FIG. 1) to retract the pressure roller 4 by a predetermined distance v (about 3 mm). The fixed size retreating means 14 constantly urges the second base 18 rearward by a predetermined pressure (a pressure lower than the operating pressure of the lower cylinder 12), and can operate only a predetermined distance. Subsequently, the sheet tip bending plate 8 and the sheet fixing plate 23 are raised. This is to prevent the rubber sheet 1 from being rolled by the pressing force when the cylindrical mold 2 is rotated in a state where the rubber sheet 1 is pressed by the pressure roller 4.

In the sixth step, as shown in FIG. 3 (f), the mold measuring roller 3 is lowered again to come into contact with the cylindrical mold 2, and the cylindrical mold 2 is rotated in the direction of arrow z. Then, the mold length measuring roller 3 is calculated as (mold circumference result value) − (cut position constant).
Until the rubber sheet 1 is shown. The cut position constant specifically refers to a distance from a tangent line 44 between the pressure roller 4 and the cylindrical mold 2 shown in FIG. 4G to the second cut groove 43 of the second cutter support plate 16. The rubber sheet 1 of this length matches the distance between the tangent line 44 and the tip 45 of the rubber sheet 1.

In the seventh step, as shown in FIG. 4 (g), the rubber sheet 1 is set to (die circumference result value)-(cut position constant).
And the cylindrical mold 2 is temporarily stopped, the mold length measuring roller 3 is raised (not shown in FIG. 4 (g)), and the sheet fixing plate 23 is lowered again to remove the rubber. Sheet 1
Is pressed against the second cut support plate 16,
The end of the rubber sheet 1 is cut by running the cutter 6. After cutting, the sheet fixing plate 23 is raised to a length corresponding to the cutting position constant (about 30 m in this embodiment).
m) Rewind the rubber sheet 1.

In the eighth step, as shown in FIG. 4H, when the winding is completed in the seventh step, the sheet fixing plate 23
And the heating table 5 is moved backward. Continued to,
The revolving frame 30 is revolved in the direction of the arrow w to bring the sheet pressing plate 7 at the tip of the revolving frame 30 closer to a position facing the joining point of the rubber sheet 1 wound around the cylindrical mold 2. Further, the pressing roller 4 is advanced and pressed against the joining point of the rubber sheet 1 to complete the molding. When the crimping is completed,
Return to the preparation stage before the step.

[0039]

As is apparent from the above description,
The power belt forming method and apparatus according to the present invention have the following excellent effects.

According to the molding method of the first aspect, the tension applied to the rubber sheet can be kept constant by mechanically winding the rubber sheet, and the elongation rate of the rubber sheet can be stably increased. The variation of the length can be reduced. In addition, since the end of the rubber sheet is mechanically cut, the cut surface becomes straight, and when the winding is completed, the end of the rubber sheet is uniformly butted against the tip. Further, even in the final procedure, when the leading end portion and the trailing end portion are abutted with each other, they can be pressed uniformly and strongly because of the sheet pressure plate.

In the molding apparatus according to the second aspect, the first aspect is as follows.
Can easily be carried out. In particular, by measuring the outer peripheral length of the cylindrical mold with a mold measuring roller equipped with an encoder, the mounting mistake of the cylindrical mold is set to 0, and the length of the rubber sheet to be wound around the cylindrical mold is reduced. Since it can be set accurately, the butt accuracy with the end is improved, and the dimensional accuracy of the completed transmission belt is improved.

According to the third aspect of the present invention, the sheet pressing plate is supported on a revolving frame that can be revolved.
When cutting the end portion of the rubber sheet and bonding the end portion of the rubber sheet, the revolving frame can be kept horizontal and accurate processing can be performed. In addition, when the rubber sheet is wound around the cylindrical mold by the pressure roller, the rubber sheet is avoided downward, and the pressure roller can be pressed against the cylindrical mold, so that the rubber sheet can be wound smoothly.

According to the fourth aspect of the present invention, even if a rubber sheet having a high rigidity is cut by the bent sheet end, the rubber sheet is forcibly pushed down in front of the pressure roller after cutting the front end. When the roller is advanced, the rubber sheet can be reliably pressed against the cylindrical mold.

According to the fifth aspect of the present invention, the heating table can be moved back and forth in three stages, so that the pressure roller and the sheet pressure plate attached to the front end thereof can be used alternately. The cut support plate provided in two stages for cutting the part and the end part can be easily moved to a required position.

In the molding apparatus according to the sixth aspect, since the rubber sheet is wound around the pressure roller at a predetermined distance from the outer peripheral surface of the cylindrical mold, the rubber sheet may be rolled by the pressure of the pressure roller. Therefore, a stable rubber sheet thickness and length can be secured.

According to the seventh aspect of the present invention, by providing the heating table with the air slide, the unvulcanized rubber sheet which is easily adhered by heating can be lifted and moved. It can be moved to a predetermined position without wrinkling and without changing the dimensions due to stretching.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire transmission belt forming apparatus according to an embodiment of the present invention.

FIGS. 2 to 4 are partial side views showing the operation of the molding apparatus of FIG. 1 for explaining a procedure for implementing the method of molding a transmission belt of the present invention using the molding apparatus of FIG. FIG.
2A is a diagram at the start of the work, showing a state in which the tip of the rubber sheet 1 is cut, and FIG. 2 (c) shows a state where the mold measuring roller 3 is pressed.
3 shows a state in which the outer peripheral length of the cylindrical mold 2 is measured.

FIG. 3D shows a state in which the tip end of the rubber sheet 1 is pressed against the cylindrical mold 1 by the pressure roller 4;
3 (e) shows a state in which the pressure roller 4 is retracted by a predetermined distance v by the fixed-size retracting means, and FIG. 3 (f) shows a state in which the rubber sheet 1 is wound around the cylindrical mold 1 while confirming the outer peripheral length. Show.

FIG. 4 (g) shows a state in which the end of the rubber sheet 1 has been cut, and FIG. 4 (h) shows a state in which the rubber sheet 1 has been completely wound.

[Explanation of symbols]

 1: Rubber sheet 2: Cylindrical mold 3: Mold measuring roller 4: Crimping roller 5: Heating table 6: Cutter 7: Crimping plate 8: Bending plate of sheet tip 10: Forward and backward moving means 11: Upper cylinder 12: Lower cylinder 13: device moving means 14: fixed-size retreating means 17: first base 18: second base 19: cutter support frame 20: mold driving means 23: sheet fixing plate

Claims (7)

[Claims] 1. A method of forming a transmission belt for cutting an unvulcanized rubber sheet into a predetermined length and winding the same around a cylindrical mold, comprising: a mold measuring roller provided with an encoder; After the cylindrical mold is rotated once by contacting the outer peripheral surface of the cylindrical mold and its outer peripheral length is measured and recorded, the cut end of the rubber sheet is pressed against the cylindrical mold by a pressure roller. The cylindrical mold is rotated, the rubber sheet having a length obtained by subtracting the cutting position constant from the outer peripheral length of the cylindrical mold is wound and stopped, and further, after the end of the rubber sheet is cut, the cut is performed. A method for forming a power transmission belt, comprising winding the rubber sheet having a length corresponding to a position constant. 2. A molding device for a power transmission belt for cutting an unvulcanized rubber sheet into a predetermined length and winding it around a cylindrical mold, wherein the cylindrical mold is horizontally supported and rotated. A heating means, a heating table which can be moved back and forth by the front and rear movement means, and which can be heated by mounting the rubber sheet on an upper surface; and a rotatably supported at a front end of the heating table, A pressure roller having an axis parallel to the axis of the cylindrical mold; and an end portion of the rubber sheet supported by a cutter support frame attached to a second base and placed on the heating table. A cutter that cuts in the direction, and is supported by the cutter support frame and abuts against the cylindrical mold.
A molding apparatus for a power transmission belt, comprising: a mold length measuring roller which is separable and has an encoder. 3. A revolving frame having a first cut support plate mounted on an upper surface thereof, the revolving frame being rotatable between the front and the lower side of the pressure roller with the axis of the pressure roller being the axis. 3. The power transmission belt forming apparatus according to claim 2, further comprising a sheet pressure bonding plate supported at a front end thereof in parallel with an axis of the pressure bonding roller. 4. A rotating shaft is provided behind the pressure roller,
The transmission belt forming apparatus according to claim 2 or 3, further comprising a sheet tip bending plate supported on a tip of a frame that can pivot from above the pressure roller to forward. 5. A sheet fixing plate attached to the cutter supporting frame so as to be able to move up and down to fix and open the rubber sheet; and a second cut supporting plate attached to the upper surface of the heating table, wherein the sheet fixing plate is An upper cylinder supported by a second base for reciprocating between a position below the sheet fixing plate and a position where the first cut support plate is below the sheet fixing plate; and moving the second base back and forth. A lower cylinder supported by a first base that presses or separates the pressure roller against the cylindrical mold; and a first cylinder at a position where the mold measuring roller can contact the outer periphery of the cylindrical mold. The apparatus for forming a transmission belt according to any one of claims 2 to 4, further comprising an apparatus moving unit that moves the base. 6. A fixed-size retreat means for automatically retreating a predetermined distance after advancing the lower cylinder and contacting the cylindrical mold with the front end of the rubber sheet sandwiched in front of the pressure roller. The transmission belt forming apparatus according to any one of claims 2 to 5, further comprising: 7. The power transmission belt forming apparatus according to claim 2, wherein an air slide is provided on the heating table.