JP2003191344A - Method for producing belt with teeth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a belt with teeth having an enough traveling life which can form complete slanted teeth or straight teeth without damaging a rubber part. <P>SOLUTION: The method includes a process in which the first canvas jacket 1A, the first rubber sheet 2A, a core 3, the second rubber sheet 4A and the second canvas jacket 5A having elasticity in the mold circumference direction are fitted in turn to a cylindrical mold 70; a process in which the second rubber sheet 4A is fluidized almost without being vulcanized by applying a low pressure and a low temperature from the outer surface side of the second canvas jacket 5A, and a cylindrical intermediate B1 with these members integrated is molded; and a process in which the demolded intermediate B1 is pressed by two plate press molds heated at a temperature to vulcanize the first and second rubber sheets 2A and 4A, and the slanted teeth or the straight teeth are molded on the surface side of the second canvas jacket 5A. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a toothed belt.

[0002]

2. Description of the Related Art As a method for manufacturing a toothed belt, for example, the following steps A to E are used. A. A stretchable canvas, a core wire, a thick unvulcanized rubber sheet, and a stretchable canvas are wound in this order on a cylindrical mold having a tooth forming groove on the outer peripheral surface. B. A cylindrical mold with stretchable canvas, core wire, unvulcanized rubber sheet and stretchable canvas wound is placed in a vulcanizing can, and steam with a predetermined pressure is introduced into the can to form a semi-vulcanized belt. Manufacture the body.

Here, in this semi-vulcanized belt molded body, the unvulcanized rubber sheet flows due to heating and pressurization by steam, and about half the amount of the unvulcanized rubber sheet exceeds the core wire. Is pressed to form an unfinished tooth following the shape of the tooth forming groove, and the other half amount is left outside without crossing the core wire. C. The cylindrical mold is taken out of the vulcanization can, cooled to room temperature, and then the semi-vulcanized belt molded body is removed from the cylindrical mold. D. The semi-vulcanized belt molded body is stretched between two toothed pulleys having teeth corresponding to the unfinished teeth formed on the semi-vulcanized belt molded body. E. The half-vulcanized belt molded body is stretched between the toothed pulleys by a pair of upper and lower pressurizing / heating dies having a tooth shape by rotating the half-vulcanized belt molded body while rotating the toothed pulley. Hold and press to form teeth on both sides.

However, in the above-mentioned manufacturing method, since it is necessary to bring one thick rubber sheet into a fluid state in the step B, the heating temperature and the pressing force must be increased, and therefore the semi-vulcanized belt is used. The vulcanization degree of the entire rubber of the molded product becomes high, and the fluidity decreases. Therefore, if it is attempted to form a complete tooth by the pressing / heating die in the step E, the rubber will be damaged, and as a result, the running life of the belt will be shortened.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a method for manufacturing a toothed belt having a sufficient running life, which can form a complete helical tooth or an immediate tooth without damaging a rubber portion. This is an issue.

[0006]

Means for Solving the Problems (Invention according to Claim 1)
A method for manufacturing a toothed belt according to the present invention comprises: covering a cylindrical mold with a first canvas jacket, winding a first rubber sheet, a core wire, and a second rubber sheet in that order, and further covering the second rubber sheet on the second rubber sheet. The step of covering the second canvas jacket having elasticity in the mold circumferential direction and the step of applying a low pressure and low temperature from the outer surface side of the second canvas jacket to cause the second rubber sheet to flow in a state where it is hardly vulcanized to integrate these members. The process of forming the cylindrical intermediate product and the demolded intermediate product
A step of pressing the two rubber sheets with two flat plate press dies heated to a temperature at which they are vulcanized to form a tooth or a straight tooth on the second canvas jacket surface side; The step of removing the molded product from the flat plate press die and cutting it into a predetermined width. (Invention of Claim 2) The method for manufacturing a toothed belt according to the present invention comprises:
A step of forming a band-shaped integral body having a temporary tooth portion by preforming with a canvas, and a band-shaped integral body in which a temporary tooth portion is fitted into the tooth molding groove in a cylindrical mold having a tooth molding groove on the outer peripheral surface. And a step of winding a core wire and a second rubber sheet on the first rubber sheet in this order, and covering the second rubber sheet with a second canvas jacket having elasticity in the mold circumferential direction. Process, and by applying low pressure and low temperature from the outer surface side of the second canvas jacket to flow the second rubber sheet to the tooth forming groove side with almost no vulcanization, the first canvas, the first rubber sheet, the core wire, and the second rubber A step of molding a cylindrical intermediate product in which a sheet and a second canvas jacket are integrated, and two flat plate press dies in which the demolded intermediate product is heated to a temperature at which the first and second rubber sheets are vulcanized Pinch with a tooth or a tooth on the surface side of the second canvas jacket. A step of molding the teeth, and remove the ones of the state where helical teeth or immediately teeth are molded from flat press die as comprising the step of cutting a predetermined width. (Invention of Claim 3) The method of manufacturing a toothed belt according to the present invention relates to the invention of Claim 1 or 2, wherein the demolded intermediate product is laid over a pair of pulleys and the pulleys are rotated to a predetermined pitch. Rotate and move each time, first and second
It is supposed that two flat plate press dies heated to a temperature at which the rubber sheet is vulcanized are pressed to form helical teeth or immediate teeth on the second canvas jacket surface side. (Invention of Claim 4) The method of manufacturing a toothed belt according to the present invention relates to the invention of Claim 1, wherein the first canvas jacket is stretchable in the circumferential direction of the mold, and a demolded intermediate product is obtained. , The pulley is rotated around the pair of pulleys, and the pulleys are rotated and moved at a predetermined pitch.
It is assumed that two flat plate press dies heated to a temperature at which the rubber sheet is vulcanized are pressed to form a helical tooth or a straight tooth on the first or second canvas jacket surface side.

The action and effect of the method for manufacturing a toothed belt according to the present invention will be described in the section of the following embodiments of the invention.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings showing the embodiments. [First Embodiment] FIG. 1 is an enlarged view of a cross section of a toothed belt B having helical teeth on one surface.

As shown in FIGS. 1 and 2, the toothed belt B includes a first rubber layer 2 which is a back plate portion, a second rubber layer 4 which has a bevel tooth portion 40 and a tooth bottom portion 41, First and second rubber layers 2, 4
It comprises a core wire 3 provided between them, a first canvas 1 covering the surface of the first rubber layer 2, and a second canvas 5 covering the surface of the second rubber layer 4.

The toothed belt B described above has the following characteristics:
It is manufactured by the process shown in. ． Step of Setting Material to Cylindrical Mold 70 Cylindrical mold 70 having no tooth forming groove as shown in FIG.
4, as shown in FIG. 4, a first canvas jacket 1A is covered, and then a first rubber sheet 2A, a core wire 3 and a second rubber sheet 4A are wound on the first canvas jacket 1A, and subsequently a mold is formed. A second canvas jacket 5A having elasticity in the circumferential direction is covered. ． As shown in FIG. 5, the cylindrical mold 70 in which the respective materials are set as shown in the molding step of the intermediate product B1 is put into the vulcanization can 73 and, as shown in FIG. Low pressure and low temperature (pressure 0.5 to 0.7 MPa, 50 only from the outer surface side)
~ 110 ° C) to flow the second rubber sheet 4A,
As shown in FIG. 6, a cylindrical intermediate product B1 in which the first canvas jacket 1A, the first rubber sheet 2A, the core wire 3, the second rubber sheet 4A, and the second canvas material 5A are integrated is molded.

The intermediate product B1 has a low pressure and low temperature (pressure 0.5 to 0.7 MPa, only from the outer surface side of the second canvas material 5A).
Since the second rubber sheet 4 </ b> A is fluidized, it is hardly vulcanized. That is, the second rubber sheet 4A and the first rubber sheet 2A
And are in a state where they are hardly vulcanized. ． Belt Teeth Forming Step First, the intermediate product B1 is removed from the cylindrical mold 70 (demolding).

Next, as shown in FIG. 7, the demolded intermediate product B1 is laid over a pair of pulleys P, P, and the pulleys P, P are rotated so as to be rotationally moved at a predetermined pitch. The first and second rubber sheets 2A and 4A are pressed by two flat plate press dies 80 and 81 which are heated to a temperature at which the rubber portion corresponding to them is vulcanized (constantly maintained at 130 to 180 ° C). 2 Mold the helical teeth on the 5A side of the canvas jacket.

After a certain time has passed, the first and second rubber sheets 2
Although the vulcanization of the rubber portion corresponding to A and 4A is completed, both the first and second rubber sheets 2A and 4A are hardly vulcanized before being formed by the flat plate press dies 80 and 81, so that the fluidity is low. Does not fall, and the flat plate press die 80 forms a perfect helical tooth without damage to the rubber part. Therefore, the toothed belt formed through the subsequent steps has a sufficient running life. ． In the cutting process, flat tooth press molds 80, 81
Remove it and cut it to the specified width. ． After the above steps, the toothed belt B having the helical teeth is completed by turning over.

In the above toothed belt B, the first canvas 1 is made of the first canvas jacket 1A, the first rubber layer 2 is made of the first rubber sheet 2A, and the second rubber layer 4 is made of the second rubber sheet 4A. The second canvas 5 is formed by the second canvas jacket 5A. [Embodiment 2] FIG. 8 is an enlarged view showing a cross section of a toothed belt B in which helical teeth are formed on one side and immediate teeth are formed on the other side. It is a partial perspective view of the toothed belt B.

As shown in FIGS. 8 and 9, the toothed belt B includes a second rubber layer 4 having a helical tooth portion 40 and a tooth bottom portion 41,
A first rubber layer 2 composed of an immediate tooth portion 20 and a tooth bottom portion 21, a core wire 3 provided between the first and second rubber layers 2 and 4, and a first rubber layer 2 which covers the surface of the first rubber layer 2. It is composed of one canvas 1 and a second canvas 5 covering the surface of the second rubber layer 4.

The toothed belt B described above has the following characteristics:
It is manufactured by the process shown in. ． Step of forming the band-shaped integrated body B1 In this step, as shown in FIG. 10, a tooth portion 61 provided on the outer periphery of the preforming toothed drum 60 and a tooth portion 63 provided on the outer periphery of the toothed roller 62 are provided. However, a device for engaging and cooperating is used, and the preforming toothed drum 60 and the toothed roller 62 are
It is rotated in the directions indicated by arrows A and B, respectively.

The first canvas material 1B is supplied to the preforming toothed drum 60 so as to surround a part of the periphery of the preforming toothed drum 60 as shown in FIG. The first canvas material 1B is introduced into
It is preformed into a corrugated shape by the cooperation of 61 and 63. Regarding the supply of the first canvas material 1B to the preformed toothed drum 60, the stretchable processed yarn is the preformed toothed drum 60.
Is performed so as to be in a direction perpendicular to the rotation axis of.

Next, as shown in FIG. 11, a steel belt 64 is applied to a part of the periphery of the preforming toothed drum 60 with an appropriate pressing force, and the same speed as the peripheral speed of the preforming toothed drum 60 is applied. Can be run in. Preformed toothed drum 60 and steel belt
The first rubber sheet 2B is supplied between the first rubber sheet 64 and the first rubber sheet 64, whereby the preformed first canvas material 1B and the first rubber sheet 2B are integrated. That is, the first rubber sheet 2B is pressed by the steel belt 64, and the first canvas material 1B after preforming is formed.
A belt-shaped integrated body B2 in which the first canvas material 1B and the first rubber sheet 2B are integrated is obtained by preforming according to the shape of the above.

The preformed band-shaped integrated body B2 is shown in FIG.
As shown in FIG. 11 and FIG. 13, temporary tooth portions 20 ′ and tooth bottom portions 21 are alternately formed, and the first canvas material 1B is coated according to the shapes of these temporary tooth portions 20 ′ and tooth bottom portions 21. ing. ． Step of Setting Material to Cylindrical Mold 70 As shown in FIG. 12, a cylindrical mold 70 having a tooth forming groove 71 on the outer peripheral surface thereof, and as shown in FIG. In the mode in which the strip is fitted, the strip-shaped integral body B for one round
Wind 2.

Then, as shown in FIG.
The core wire 3 and the second rubber sheet 4B are wound on the second first rubber sheet 2B in this order, and the second canvas jacket 5B having elasticity in the mold circumferential direction is further covered on the second rubber sheet 4B. ． As shown in the molding process of the intermediate product B3, the cylindrical mold 70 in which each material is set is put in the vulcanization can 73 (see FIG. 5), and the low pressure and low temperature (only from the outer surface side of the second canvas jacket 5B). A pressure of 0.5 to 0.7 MPa, 50 to 110 ° C.) is applied to flow the second rubber sheet 4B, and as shown in FIG.
First canvas material 1B, first rubber sheet 2B, core wire 3, second
A cylindrical intermediate product B3 in which the rubber sheet 4B and the second canvas jacket 5B are integrated is molded. In this state, the intermediate product B3 has teeth 20 ″ (immediate teeth) that are almost vulcanized but are close to the final shape on the inner peripheral surface side.

The intermediate product B3 has a low pressure and low temperature (pressure 0.5 to 0.7 MPa, only from the outer surface side of the second canvas material 5B).
Since the second rubber sheet 4B is fluidized, it is hardly vulcanized. That is, the second rubber sheet 4B and the first rubber sheet 2B
And are in a state where they are hardly vulcanized. ． Belt Teeth Forming Step First, the intermediate product B3 is removed from the cylindrical mold 70 (demolding).

Next, as shown in FIG. 15, the demolded intermediate product B3 is laid over a pair of toothed pulleys P'and P'and rotated by the toothed pulleys P'and P'tooth 20 '. 'To rotate and move for each pitch, the first and second rubber sheets 2B,
The temperature at which the rubber portion corresponding to 4B is vulcanized (130-1
Two flat plate press dies 80B, 81B heated to 80 ℃
Then, a tooth is formed on the second canvas jacket 5B side and a tooth is immediately formed on the first canvas material 1B side.

After a certain period of time, the first and second rubber sheets 2
Although the vulcanization of the rubber portions corresponding to B and 4B is completed, both the first and second rubber sheets 2B and 4B are hardly vulcanized before being formed by the flat plate press molds 80B and 81B. 2 The rubber part on the side of the rubber sheet 4 is completely protected by the flat plate press die 80B without being damaged.
However, the rubber portion on the side of the first rubber sheet 2 is not damaged and the complete immediate tooth portion 20 is formed by the flat plate press die 81B. Therefore, the toothed belt formed through the subsequent steps has a sufficient running life. ． In the cutting step, the toothed and straight teeth are removed from the flat plate press dies 80B, 81B and cut into a predetermined width. ． After the above steps, when turned inside out, a toothed belt B having helical teeth inside and immediate teeth outside is completed.

In the above toothed belt B, the first canvas 1 is made of the first canvas material 1B, the first rubber layer 2 is made of the first rubber sheet 2B, and the second rubber layer 4 is made of the second rubber sheet 4B. The second canvas 5 is formed by the second canvas jacket 5B. (Other Embodiments) In the first embodiment, the first canvas jacket 1A has elasticity in the mold circumferential direction,
If the helical teeth are formed on the first canvas jacket 1A side, the step of turning over is unnecessary.

In the first embodiment, the belt may have teeth immediately formed on one surface.

Further, in the second embodiment, the tooth may be formed with helical teeth or straight teeth on both sides of the belt.

[0027]

The present invention having the above-mentioned structure has the following effects.

As is clear from the contents of the section of the embodiment of the invention, a method for manufacturing a toothed belt having a sufficient running life, which can form a complete helical tooth or an immediate tooth without damaging a rubber portion. Could be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a toothed belt according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the toothed belt.

FIG. 3 is a perspective view of a cylindrical mold used for molding the intermediate product B1 according to the first embodiment, which has no tooth forming groove on the outer peripheral surface.

FIG. 4 is a view showing that the first mold jacket is attached to the cylindrical mold,
Sectional drawing which shows the state which set the 1st rubber sheet, the core wire, the 2nd rubber sheet, and the 2nd canvas jacket.

FIG. 5 is a perspective view of a vulcanization can used for molding the intermediate product B1 according to the first embodiment.

6 is a cross-sectional view showing a state in which an intermediate product is formed by applying low pressure and low temperature from the second canvas jacket side in the state of FIG. 4.

FIG. 7 is an explanatory view showing a procedure for molding helical teeth on one surface of the intermediate product.

FIG. 8 is a sectional view of a toothed belt according to a second embodiment of the present invention.

FIG. 9 is a perspective view of the toothed belt of the second embodiment.

FIG. 10 is an explanatory view showing a state in which the first canvas material is preformed into a corrugate by the preforming toothed drum and the toothed roller.

FIG. 11 is an explanatory view showing a state in which a band-shaped integrated body is formed from the first canvas material and the first rubber sheet.

FIG. 12 is a perspective view of a cylindrical mold having a tooth forming groove on an outer peripheral surface used for molding the intermediate product B3 according to the second embodiment.

FIG. 13 is a cross-sectional view showing a state in which a band-shaped integral body made of a first canvas material and a first rubber sheet, a core wire, a second rubber sheet, and a second canvas jacket are set in the cylindrical mold.

14 is a cross-sectional view showing a state in which an intermediate product is formed by applying low pressure and low temperature from the second canvas jacket side in the state of FIG. 13.

FIG. 15 is an explanatory view showing a procedure for molding helical teeth on one surface of the intermediate product.

[Explanation of symbols]

B Toothed belt B1 intermediate product B2 Belt-shaped integrated object B3 Intermediate product P pulley P'toothed pulley 1A First canvas jacket 1B First canvas material 2A 1st rubber sheet 2B 1st rubber sheet 20 'false tooth 3 cores 4A Second rubber sheet 4B 2nd rubber sheet 5A Second canvas jacket 5B 2nd canvas jacket 70 Cylindrical mold 71 Tooth forming groove 80,81 Flat plate die 80B, 81B Flat plate press die

Continued front page    (72) Inventor Kaneda clearly             172 Unita Co., Ltd., Ikezawa Town, Yamatokoriyama City, Nara Prefecture             Ceremony company Nara factory inside (72) Inventor Motohisa Kawano             172 Unita Co., Ltd., Ikezawa Town, Yamatokoriyama City, Nara Prefecture             Ceremony company Nara factory inside F-term (reference) 4F203 AA45 AD05 AD16 AD18 AG17                       DA11 DC13 DJ11 DL10                 4F213 AA45 AD05 AD16 AD18 AG17                       WA04 WA41 WA53 WA63 WA83                       WA87 WB01 WC03

Claims (4)

[Claims] 1. A cylindrical mold is covered with a first canvas jacket, on which a first rubber sheet, a core wire and a second rubber sheet are wound in order, and the second rubber sheet is expanded and contracted in the circumferential direction of the mold. And a cylindrical intermediate product in which these members are integrated by applying a low pressure and low temperature from the outer surface side of the second canvas jacket to cause the second rubber sheet to flow in a state where it is hardly vulcanized And the step of molding the demolded intermediate product with two flat plate press dies heated to a temperature at which the first and second rubber sheets are vulcanized, and a tooth or a tooth on the second canvas jacket surface side. Manufacture of a toothed belt, characterized by comprising a step of molding immediate teeth and a step of removing a beveled tooth or a molded tooth having immediate teeth from a flat plate press die and cutting it into a predetermined width. Method. 2. A step of preforming a first rubber sheet and a first canvas at a temperature at which they are hardly vulcanized to form a band-shaped integral body having a temporary tooth portion, and a cylindrical mold having a tooth-forming groove on its outer peripheral surface. And a step of winding the band-shaped integrated body in a manner that a temporary tooth portion is fitted in the tooth forming groove, and a core wire and a second rubber sheet are sequentially wound on the first rubber sheet, and the second rubber sheet is wound. A step of covering the sheet with a second canvas jacket having elasticity in the circumferential direction of the mold, and applying a low pressure and low temperature from the outer surface side of the second canvas jacket to the tooth forming groove side while the second rubber sheet is hardly vulcanized. Fluidize, 1st canvas, 1st
A step of molding a cylindrical intermediate product in which a rubber sheet, a core wire, a second rubber sheet, and a second canvas jacket are integrated, and the demolded intermediate product is heated to a temperature at which the first and second rubber sheets are vulcanized. A step of pressing two heated flat plate pressing dies to form a helical tooth or a straight tooth on the second canvas jacket surface side, and a step of molding a helical tooth or a straight tooth in a flat plate pressing die And a step of cutting the toothed belt to a predetermined width. 3. The demolded intermediate product is laid over a pair of pulleys, and the pulleys are rotated so as to rotate and move at predetermined pitches. The first and second rubber sheets are heated to a temperature at which they are vulcanized. The method for producing a toothed belt according to claim 1 or 2, wherein the toothed belt is formed by pressing the two flat plate press dies to form a tooth on the second canvas jacket surface side. 4. The first canvas jacket is stretchable in the mold circumferential direction, and the demolded intermediate product is hung on a pair of pulleys and the pulleys are rotated so that the intermediate product is rotatively moved at a predetermined pitch. Characterized in that two or more flat plate press dies heated to a temperature at which the first and second rubber sheets are vulcanized are squeezed to form a helical tooth or a straight tooth on the first or second canvas jacket surface side. The method for manufacturing a toothed belt according to claim 1.