JPH10138361A - Manufacture of belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position of a belt at a suitable position in a belt thickness direction of a core body component by uniformizing a thickness of the belt without uniformizing a thickness of a sheet itself by a method wherein first and second cutting processes wherein a surface is cut to a uniform thickness are provided after first and second pressurizing processes wherein an unvulcanized elastomer sheet on a mold are pressurized. SOLUTION: In a first forming process A, a peripheral face of a cylindrical mold is covered by a cylindrical canvas, an unvulcanized elastomer sheet is wound thereon, and an under canvas layer and an under rubber layer are provided. In a first pressurizing process B wherein that is pressurized and a first cutting process C, a surface of the under rubber layer is cut to be uniformized to a specific thickness. Then, after winding a core body component on the under rubber layer in a second forming process D, an unvulcanized rubber sheet is wound thereon to provide an upper rubber layer. Further, in a second pressurizing process E, an upper rubber layer is pressurized, and a surface of the upper rubber layer is unifomized to a specific thickness in a second cutting process F. An upper canvas layer is provided on the upper rubber layer in a third forming process G, and a cylindrical slab composed of from the lower canvas layer to the upper canvas layer is fabricated to a product in a vulcanizing pressurizing process H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a belt such as a flat belt, a V-belt, a cogged belt, a toothed belt, etc., in which an elastomer layer is disposed on both sides of a belt of a core member. The measures to make the uniformity.

[0002]

2. Description of the Related Art In general, a belt in which a rubber layer is integrally provided on both sides of a belt of a core member is known. As a conventional method for manufacturing such a belt, first, an unvulcanized rubber sheet is wound on a cylindrical mold to provide an unvulcanized lower rubber layer, and a core member is wound thereon, and Then, an unvulcanized rubber sheet is wound around to provide an unvulcanized upper rubber layer. Then, the cylindrical slab having the unvulcanized lower rubber layer, the core member and the unvulcanized upper rubber layer is vulcanized under pressure.

More specifically, as shown in FIG. 8, a first molding step a for providing an unvulcanized lower rubber layer, a first pressing step b for pressing the lower rubber layer, A second molding step c for providing an unvulcanized upper rubber layer via a core member thereon, a second pressing step d for pressing the upper rubber layer, and a vulcanizing step e for vulcanizing the rubber layers Consists of That is, in the first molding step a, the unvulcanized lower rubber layer is provided by winding the unvulcanized rubber sheet around the peripheral surface of the cylindrical mold a predetermined number of times (for example, three times). Further, in the second molding step c, after the core member is wound on the lower rubber layer, an unvulcanized rubber sheet is wound thereon a predetermined number of times (for example, three times) to form an unvulcanized upper rubber. Provide a layer.

[0004]

The thickness of the rubber sheet varies. For this reason, if the rubber layer is provided by winding such a rubber sheet several times, the thickness variation as a belt increases accordingly. Further, if the thickness of the rubber layers varies between both surfaces of the belt, the core body shifts in the belt thickness direction, which may cause a variation in the pitch height.
Although these are unsuitable for recent demands for higher precision belts, it is difficult to eliminate variations in the thickness of the rubber sheet itself. Is required.

The present invention has been made in view of the above points, and a main object thereof is to manufacture a belt in which an elastomer layer such as a rubber layer is disposed on both sides of a belt of a core member. Even if there is some variation in the thickness accuracy of the elastomer sheet for forming the elastomer layer, the thickness accuracy of the belt can be improved without reducing the variation in the thickness of the sheet itself. is there.

[0006]

In order to achieve the above object, according to the present invention, an elastomer sheet is wrapped to form an unvulcanized elastomer layer, and then the surface of the elastomer layer is cut. The thickness of the elastomer layer was made uniform to a predetermined thickness.

Specifically, according to the first aspect of the present invention, a core member extending in the belt length direction, a lower elastomer layer disposed on the inner side of the belt of the core member, and a belt back surface of the core member The method is based on a method for producing a belt having an upper elastomer layer disposed on the side.

A first forming step of winding an unvulcanized elastomer sheet around the peripheral surface of the cylindrical mold to provide an unvulcanized lower elastomer layer; and a first pressing step of pressing the lower elastomer layer. A first cutting step of cutting the surface of the lower elastomer layer so that the thickness of the lower elastomer layer pressed in the first pressing step is equalized to a predetermined thickness; After winding the core member on the cut lower elastomer layer, a second molding step of winding an unvulcanized elastomer sheet on the core member to provide an unvulcanized upper elastomer layer, A second pressing step of pressing the upper elastomer layer, and cutting the surface of the upper elastomer layer so that the thickness of the upper elastomer layer pressed in the second pressing step is made uniform to a predetermined thickness. The second cutting step and the above unvulcanized Lower elastomer layer, so that and a press vulcanization step of the tubular slab press vulcanization comprising a elastomeric layer over the tension member members and unvulcanized. That is,
When shifting from the first pressure step to the second molding step and from the second pressure step to the pressure vulcanization step, a step of cutting the surface of each elastomer layer is performed.

In the above configuration, in the first molding step,
An unvulcanized lower elastomer layer is provided by winding the unvulcanized lower elastomer sheet a predetermined number of times around the peripheral surface of the cylindrical mold, and then, in the first pressing step, the peripheral surface shape of the mold is adjusted to the lower The elastomer layer is pressurized, for example, to transfer to the elastomer layer. Next, in the first cutting step, the surface of the lower elastomer layer is cut, whereby the thickness of the lower elastomer layer is made uniform to a predetermined thickness, and the thickness variation is canceled.

In the second molding step, after the core member is wound on the lower elastomer layer, an unvulcanized elastomer sheet is wound thereon to provide an unvulcanized upper elastomer layer. In addition, the elastomer layer is pressed in the second pressing step. Next, in the second cutting step, the surface of the upper elastomer layer is cut, whereby the thickness of the upper elastomer layer is made uniform to a predetermined thickness, and the variation in the thickness is canceled. Thereafter, in a vulcanization step, the cylindrical slab having the unvulcanized lower elastomer layer, the core member, and the unvulcanized upper elastomer layer is vulcanized under pressure.

Accordingly, since the thickness of each of the above-mentioned elastomer layers is made uniform to a predetermined thickness, the belt thickness itself is also made uniform to the predetermined thickness. In addition, since each of the elastomer layers is made uniform to a predetermined thickness, the core member interposed between the two elastomer layers can be properly positioned at a predetermined position in the belt thickness direction.

According to a second aspect of the present invention, in the first aspect of the invention, in the first cutting step, a cylindrical slab having a lower elastomer layer is removed from a cylindrical mold and wound around two axes, The surface of the lower elastomer layer is cut while running while applying tension between the two axes.

[0013] In the above configuration, the cylindrical slab having the lower elastomer layer provided in the first molding step is:
After being pressurized in the first pressurizing step, in the first cutting step, it is detached from the cylindrical mold and wound around two axes. Then, the surface is cut while traveling while applying tension between the two axes. Accordingly, when the surface of the lower elastomer layer is cut while rotating the mold on the cylindrical mold, it is difficult to cut the surface of the lower elastomer layer by sliding the slab on the mold. On the other hand, the slab can be made to travel more reliably, and therefore, the cutting can be performed more reliably.

According to a third aspect of the present invention, in the first aspect of the invention, in the second pressing step, the cylindrical slab having the lower elastomer layer, the core member and the upper elastomer layer is rotated by the pressing. Apply pressure until the length change is stable.

In the above configuration, in the second pressurizing step,
The cylindrical slab having the lower elastomer layer, the core member and the upper elastomer layer is pressurized.
The circumference of the slab changes in the direction of shortening. At this time,
By applying pressure until the change in circumference becomes stable, the elastomer of the upper elastomer layer almost completely covers the core member. Thereby, in the vulcanizing step performed after the thickness is equalized to the predetermined thickness in the second cutting step, the surrounding elastomer flows into the portion of the core member where the elastomer of the upper elastomer layer is incompletely covered. Variations in thickness resulting from this are avoided.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a configuration of a high-load transmission V-belt according to an embodiment of the present invention. The high-load transmission V-belt includes a large number of blocks arranged at predetermined pitch intervals in the belt length direction. 7, 7, ..., left and right 1
It is locked and fixed by tension bands 1 and 1 as a pair of belts, and is used by being wrapped around a variable speed pulley having a variable pulley groove width.

First, the tension bands 1, 1 and the block 7,
Each shape of 7,... Will be described. Each of the tension bands 1 is of a cogged belt type having cogs on both surfaces thereof, and has a circular arc shape provided on its lower surface so as to extend in the belt width direction, as shown in FIG. A number of lower grooves 1a, 1a,...
A plurality of upper surface grooves 1b, 1b,... Each having a concave cross section, which are also provided so as to extend in the belt width direction, are arranged at predetermined pitch intervals in the belt length direction and correspond vertically. ing.

On the other hand, each of the blocks 7 has a substantially trapezoidal shape in which the dimension in the belt width direction decreases toward the lower surface side, and both left and right sides in the belt width direction are in sliding contact with the groove surfaces of the speed change pulley. The sliding portions 8 are provided. Slit-shaped fitting portions 9, 9 are provided on both left and right sides of each block 7 so as to penetrate in the belt length direction and extend in the belt width direction and are opened to the side. When the tension bands 1 are pushed into the joint portion 9, the blocks 7, 7, ... are locked and fixed by the pair of right and left tension bands 1, 1. Specifically, the lower edge of each fitting portion 9 is provided with an upwardly protruding ridge 7a that has an arc-shaped cross section that protrudes upward and engages with the lower surface groove 1a of the tension band 1. On the other hand, the lower edge of each fitting portion 9 is provided with a downward protruding ridge 7b which has a concave cross section projecting downward and engages with the upper surface groove 1b of the tension band.
Thus, each block 7 is locked and fixed.

Next, the structure of each tension band 1 will be described. Each tension band 1 extends substantially in the belt length direction (substantially left-right direction in FIG. 3) and is arranged spirally at a predetermined pitch in the belt width direction. A lower rubber layer 3 as a lower elastomer layer disposed on the inner surface side of the belt (lower surface side in the drawing) and an upper elastomer layer disposed on the back side of the belt of the core member 2 (upper surface side in the drawing). And a rubber layer 4. A lower canvas layer 5 is integrally provided on the inner side of the lower rubber layer 3 with the belt, and an upper canvas layer 6 is integrally provided on the rear side of the belt with the upper rubber layer 4.

Here, a method of manufacturing the tension bands 1, 1,... Will be described with reference to FIG. In the following description, “′” is added to each symbol of the vulcanized lower canvas layer 5, the lower rubber layer 3, the core member 2, the upper rubber layer 4, and the upper canvas layer 6.
To indicate that they are in a state before vulcanization, respectively.

In the present embodiment, after a cylindrical canvas is covered on the peripheral surface of the cylindrical mold, an unvulcanized rubber sheet as an unvulcanized elastomer sheet is wound on the canvas to form a lower canvas layer 5 '. And a first molding step A for providing a lower rubber layer 3 ', a first pressing step B for pressing the lower rubber layer 3', and a first pressing step B for pressing the lower rubber layer 3 'pressed in the first pressing step B. A first cutting step C for cutting the surface of the lower rubber layer 3 ′ so that the thickness is uniformized to a predetermined thickness, and an upper part of the lower rubber layer 3 ′ whose surface has been cut in the first cutting step C. After the core member 2 ′ is wound around the core member 2 ′, an unvulcanized rubber sheet is wound around the core member 2 ′ to provide an upper rubber layer 4 ′, and the upper rubber layer 4 ′ is formed. A second pressing step E for pressing, and a second pressing step E
A second cutting step F for cutting the surface of the upper rubber layer 4 ′ so that the thickness of the upper rubber layer 4 ′ pressed in the step S is equalized to a predetermined thickness; A third forming step G of providing an upper canvas layer 6 'on the cut upper rubber layer 4';
The tension in the pressure vulcanizing step H, in which the cylindrical slab composed of the lower canvas layer 5 ', the lower rubber layer 3', the core member 2 ', the upper rubber layer 4' and the upper canvas layer 6 'is vulcanized under pressure. The bands 1, 1, ... are manufactured.

More specifically, first, in the first molding step A, after covering a cylindrical canvas on the peripheral surface of a cylindrical mold, an unvulcanized rubber sheet is placed thereon a predetermined number of times (for example, three times). ) Just wrap. Thus, a lower canvas layer 5 'and a lower rubber layer 3' are provided. Next, in the first pressurizing step B, the mold is assembled to a gasket to squeeze the lower canvas layer 5 'and the lower rubber layer 3', and the resulting cylindrical slab w is removed from the cylindrical mold.

In the first cutting step C, as shown in FIG. 4, a slab w is provided between the driving shaft 10 and the driven shaft 11 by using a belt traveling device having a driving shaft 10 and a driven shaft 11. By winding the cylindrical slab w in the direction in which the distance between the driven shaft 11 and the drive shaft 10 is increased (left direction in the figure) by further inclining the axis of the driven shaft 11 with respect to the drive shaft 10. While the slab w is run while applying tension, the blade 12 is moved in the opposite direction (rightward in the figure).
Are moved to cut the surface of the lower rubber layer 3 ′ on the drive shaft 10.

Next, in the second forming step D, the cylindrical slab w is removed from the drive shaft 10 and the driven shaft 11 and put on a cylindrical mold, and the core member 2 'is wound thereon in a spiral shape. An upper rubber layer 4 'is provided by winding a vulcanized rubber sheet a predetermined number of times (for example, three times). afterwards,
In the second pressurizing step E, the mold is assembled to a gasket, and the cylindrical slab including the lower canvas layer 5 ', the lower rubber layer 3', the core member 2 'and the upper rubber layer 4' is pressed. At that time,
The cylindrical slab is pressed until the change in circumference due to pressing is stabilized. That is, since the circumference of the slab changes in a direction to be shortened with the pressing, the slab is pressed until the change in the circumference hardly changes.

Then, in the second cutting step F, the surface of the upper rubber layer 4 'is cut using a cutting tool while rotating the mold. Next, in a third molding step G, a tubular canvas is put on the upper rubber layer 4 'whose surface has been cut in the second cutting step F to provide an upper canvas layer 6'. Thereafter, in the pressure vulcanization step H, vulcanization is performed while pressing a cylindrical slab composed of the lower canvas layer 5 ', the lower rubber layer 3', the core member 2 ', the upper rubber layer 4', and the upper canvas layer 6 '. I do. Through the above steps A to F, a belt molded body in which a plurality of tension bands 1, 1,... Are integrally joined in the belt width direction is obtained. By cutting to width, each tension band 1
Is obtained.

Therefore, according to the present embodiment, the unvulcanized lower rubber layer provided in the first molding step A is manufactured when the tension bands 1, 1,... Used for the high-load transmission V-belt are manufactured. Since the surface of the lower rubber layer 3 'is cut in the first cutting step C after squeezing the lower rubber layer 3' in the first pressing step B, the dispersion of the thickness of the rubber sheet is canceled and the lower rubber layer 3 'is canceled. 3 'can be made uniform to a predetermined thickness.

After the unvulcanized upper rubber layer 4 'provided in the second molding step D is squeezed in the second pressing step E, the surface of the upper rubber layer 4' is removed in the second cutting step F. Since the cutting is performed, as in the case of the lower rubber layer 3 ', the variation in the thickness of the rubber sheet can be canceled and the upper rubber layer 4' can be made uniform to a predetermined thickness.

In addition, in the second pressing step E, the squeezing is performed until the change in the circumferential length of the cylindrical slab is stabilized, so that the rubber of the upper rubber layer 4 'is almost completely applied to the core member 2'. As a result, in the subsequent pressure vulcanization step H, the surrounding rubber flows to the part of the core member 2 ′ where the rubber of the upper rubber layer 4 ′ is only covered incompletely. Variations in thickness caused due to this can be avoided, and the thickness of the upper rubber layer 4 'can be made more uniform.

Therefore, when the tension bands 1, 1,... Are manufactured using the rubber sheets having thickness variations, the rubber layers 3 ', 3', 4 'can be made uniform to a predetermined thickness.

Further, by making the upper rubber layer 4 'and the lower rubber layer 3' uniform to a predetermined thickness, the core member 2 'interposed between the rubber layers 4' and 3 'can be belt-thick. It can also be properly positioned at a predetermined position in the vertical direction.

In the first cutting step C, the cylindrical slab w
Is removed from the mold and wound around the two shafts 10 and 11, and the surface of the lower rubber layer 3 ′ is cut while running while applying tension between the two shafts 10 and 11. Thus, the cutting can be performed more reliably than when the cutting is performed by rotating the mold.

In the above-described embodiment, the cogged belt type tension bands 1, 1,... Having cogs on both surfaces of the belt are described, but the present invention, as shown in FIG. As long as the elastomer layers 3 and 4 are disposed on both surfaces and there is no means for holding the core member 2 at a predetermined position in the belt thickness direction at the time of belt production, the present invention can be applied. In the case where the fabric layers are provided on both sides of the belt as in the above embodiment, as shown in FIG.
The present invention can be applied as long as the canvas layers 5 and 6 are arranged in portions not in contact with the core member 2.

(Specific Example) Next, the production of the tension band will be specifically described. As the unvulcanized rubber sheet for forming the lower rubber layer and the upper rubber layer, a rubber sheet having a designed thickness of 0.7 mm was used.

First, the rubber sheet was wound three times around the peripheral surface of a cylindrical mold covered with a tubular canvas to provide an unvulcanized lower rubber layer (first molding step). When the thickness of the crest between the lower grooves of the lower rubber layer was measured, there was a variation of about ± 0.06 mm.

Next, the mold is assembled to a gasket to squeeze the lower rubber layer (first pressurizing step), and then the slab composed of the lower canvas layer and the lower rubber layer is removed from the mold to remove the slab of the hill. When the thickness variation was measured, it was about ± 0.17 mm. On the other hand, the slab is removed from the mold, wound around two axes, and the lower rubber layer is cut (first cutting step) while running while applying tension between the two axes. When the thickness of the portion was measured, the variation was ± 0.
It was about 03 mm. That is, the variation in the thickness of the unvulcanized lower rubber layer due to the first cutting step is ± 0.17.
mm to ± 0.03 mm.

Further, the slab is mounted on a cylindrical mold,
After the core member is wound, an unvulcanized rubber sheet is wound only three times to provide an unvulcanized upper rubber layer (second molding step). Then, the mold is assembled to a gasket to form an upper rubber layer. After squeezing (second pressurizing step), the slab is cut open and the thickness of the peak is measured.
It was about 6 mm. On the other hand, when the mold is rotated after the pressurization and the surface of the upper rubber layer is cut with a blade (second cutting step) and the thickness of the crest is measured, the variation is about ± 0.04 mm. Met. That is, the second
Due to the cutting process, the variation in the thickness of the ridge portion where the upper rubber layer is added to the lower rubber layer is from ± 0.16 mm to ± 0.04 mm
That is, it has been reduced.

After the canvas is put on the slab and the upper canvas layer is provided (third molding step), vulcanization is performed while pressing the lower rubber layer and the upper rubber layer (pressure vulcanization step). ) When the thickness of the peak portion of the slab (formed belt) was measured, the thickness variation was about ± 0.06 mm. Subsequently, when the distance between the axes of a plurality of tension bands obtained by cutting the slab to a width of 10 mm was measured, the variation in the distance between the axes was about ± 0.02 mm.

On the other hand, a tension band as a comparative example was produced using the same material as in the above-mentioned invention and without performing the first and second cutting steps. As a result, the variation in the thickness of the peak portion of the obtained tension band was ± 0.30 mm (± 30 mm in the case of the invention example).
0.06 mm), and the variation in the distance between the axes was about ± 0.09 mm (± 0.02 mm in the case of the invention). That is, comparing the two, in the invention example,
The variation in thickness is approximately 1/5 (= 0.06 / 0.30)
And the variation in the distance between the axes is approximately 1 / 4.5 (= 0.0
2 / 0.09).

Further, in the case of the above invention example, the second
During the pressing step, the slab was pressed until the outer peripheral length hardly changed. In other words, the temperature of the slab changes with the peripheral length of the slab as the slab is compressed, but when the slab is compressed while measuring the temperature of the core layer portion of the slab together with the peripheral length, the slab temperature is measured. Became larger than a predetermined value, the outer peripheral length hardly changed. Specifically, the outer peripheral length of the slab before the second pressing step is 598.
0 mm, and has a tendency to become shorter as the slab temperature rises. However, as shown in FIG. 7, the degree of shortening gradually becomes smaller as the temperature rises, and becomes substantially constant when the slab temperature becomes 70 ° C. or more. Value (in the example shown, approximately 5
97.3 mm). Therefore, when the slab temperature reaches 70 ° C., it is considered that the circumferential change of the slab has reached a stable state.

The slab was cut at the time when the slab temperature reached 70 ° C., and it was found that the rubber of the upper rubber layer completely covered the core member. Thereafter, the slab in a state in which the rubber completely covers the core body member is squeezed and vulcanized to produce a tension band, and when the variation in the thickness of the peak portion is measured, the above-mentioned ± 0.06 mm is further reduced to ± 0. .0
It was found that it was reduced to 4 mm.

[0041]

As described above, according to the first aspect of the present invention, as a method for manufacturing a belt in which an elastomer layer is disposed on both surfaces of a core member, a cylindrical mold is used in first and second molding steps. After the first and second pressurizing steps of pressing each unvulcanized elastomer layer provided by winding the unvulcanized elastomer sheet above, the surface of each elastomer layer is cut to reduce its thickness. Since the first and second cutting steps for equalizing the predetermined thickness of the elastomer sheet are provided, without equalizing the thickness of the elastomer sheet itself,
Variations in belt thickness can be reduced, and the respective elastomer layers are made uniform to a predetermined thickness, so that the core member can be properly positioned at a predetermined position in the belt thickness direction.

According to the second aspect of the present invention, in the first cutting step, the cylindrical slab having the lower elastomer layer is removed from the cylindrical mold and wound around two axes, and tension is applied between the two axes. , The surface of the lower elastomer layer can be more reliably cut than in the case of cutting while rotating and driving a cylindrical mold. The effect of the invention can be efficiently obtained.

According to the third aspect of the present invention, in the second pressurizing step, pressurization is performed until the circumferential change of the cylindrical slab having the lower elastomer layer, the core member and the upper elastomer layer is stabilized. Since the core member can be almost completely covered with the elastomer of the upper elastomer layer,
Therefore, during the vulcanization step, it is possible to avoid the thickness variation caused by the surrounding elastomer flowing over the portion of the core body member where the elastomer of the upper elastomer layer is only incompletely covered, and the thickness of the upper elastomer layer can be reduced. Can be further uniformized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a tension band manufacturing process according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a high-load transmission V-belt.

FIG. 3 is an enlarged longitudinal sectional view schematically showing the configuration of a tension band.

FIG. 4 is a plan view schematically showing a state in which the surface of the upper rubber layer is cut in a first cutting step.

FIG. 5 is a diagram corresponding to FIG. 3, showing a configuration of another belt to which the present invention is applied.

FIG. 6 is a diagram corresponding to FIG. 3, showing a configuration of another belt to which the present invention is applied.

FIG. 7 is a characteristic diagram showing a relationship between a slab outer peripheral length and a slab temperature in a second pressing step.

FIG. 8 is a view corresponding to FIG. 1 showing a conventional belt manufacturing process.

[Explanation of symbols]

 A first forming step B first pressing step C first cutting step D second forming step E second pressing step F second cutting step H pressure vulcanizing step 1 tension band (belt) 2 core member 3 bottom Rubber layer (lower elastomer layer) 4 Upper rubber layer (upper elastomer layer) 10 Drive shaft (shaft) 11 Follower shaft (shaft) w Slab

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 29:00

Claims (3)

[Claims] 1. A core member extending in a belt length direction, a lower elastomer layer disposed on an inner surface side of the belt of the core member, and an upper elastomer layer disposed on a back side of the belt of the core member. A method for producing a belt comprising: a first molding step of winding an unvulcanized elastomer sheet around a peripheral surface of a cylindrical mold to provide an unvulcanized lower elastomer layer; and pressurizing the lower elastomer layer. A first pressing step, a first cutting step of cutting the surface of the lower elastomer layer so that the thickness of the lower elastomer layer pressed in the first pressing step is equalized to a predetermined thickness; After the core member is wound on the lower elastomer layer whose surface has been cut in the first cutting step, an unvulcanized elastomer sheet is wound on the core member to provide an unvulcanized upper elastomer layer. A second molding step; A second pressing step of pressing the last layer, and a second step of cutting the surface of the upper elastomer layer so that the thickness of the upper elastomer layer pressed in the second pressing step is uniformized to a predetermined thickness. 2 a cutting step, and a pressure vulcanizing step of pressure vulcanizing a cylindrical slab having the unvulcanized lower elastomer layer, the core member and the unvulcanized upper elastomer layer. A method for producing a belt, comprising: 2. The method for producing a belt according to claim 1, wherein in the first cutting step, the cylindrical slab having the lower elastomer layer is removed from a cylindrical mold and wound around two axes. A method for producing a belt, comprising cutting the surface of the lower elastomer layer while running while applying tension between the belts. 3. The belt manufacturing method according to claim 1, wherein, in the second pressing step, the circumferential length of the cylindrical slab having the lower elastomer layer, the core member and the upper elastomer layer is changed by the pressing. A method for producing a belt, wherein pressure is applied until the pressure is stabilized.