JPH0528978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a low edge V-belt, and more specifically, a method for manufacturing a low-edge V-belt, in which a plurality of vulcanized sleeves in the form of a relatively long flat belt with a belt length of 100 inches or more are mounted on two shafts. This invention relates to a simple method for manufacturing a low-edge V-belt that is simultaneously polished and cut.

(Prior art) Conventionally, there are two methods for manufacturing low-edge type V-belts: the angle-cut method and the method of square-cutting and then polishing into a V-shape (SCAM). Molding of belt laminate, (2) Vulcanization of the belt molded body, (3) Cooling of the molded body, (4) Removal of the vulcanized sleeve-shaped belt molded body from the drum, (5) Removed belt molded body storage, (6)
Transferring the belt moldings to the expander drum, followed by V-cutting into individual V-belts, and (7) V-belt production by wrapping the V-belt around a pair of pulleys to reduce vibration of the V-belt. Siding work to polish the sides, (8) inspection, (9)
Processes such as belt deburring and other finishing work are employed.

As an alternative to the angle cut method, there is a method in which the sleeve is square cut to a predetermined width, and then each belt is turned over and the side surfaces are polished into a V shape.

(Problem to be solved by the invention) However, the above-mentioned manufacturing method has no problem when the belt size is relatively short (100 inches or less), but when the belt size is long (100 inches or more)
In the former case, it is difficult to form a perfect circle because the wide vulcanized belt is transferred to another expander drum and this drum is expanded, resulting in variations in the upper width and angle of the belt when V-shaped cutting occurs, and the V-belt This required extra steps such as sanding to polish the sides, which resulted in a lot of scrap and complicated the process.

Further, in the latter case, the variation in the upper width and angle of the V-belt is smaller than in the former case, but since each belt is polished one by one, there are problems such as poor productivity and an increase in the cost of the belt.

As a result of various studies in order to solve the above-mentioned problems, the present invention has been developed to simultaneously vulcanize a plurality of vulcanized sleeves in the form of a flat belt with a relatively long belt length using a two-axis drum.
By polishing the shape and then cutting, it is possible to create a low edge V with good cutting precision and work efficiency.
The purpose of the present invention is to provide a method for manufacturing a belt.

(Means for Solving the Problems) In order to achieve this object, the present invention is characterized by having an extension part of the belt on the outer peripheral surface of the forming drum.
The members constituting each part of the tensile body part and the compression part are wound in a laminated manner to form an unvulcanized belt sleeve, and after vulcanization, the vulcanized sleeve is suspended between a pair of driving drums and a driven drum, and circulated. A polishing wheel consisting of a group of grindstones having a V-shaped cross section is press-fitted on the surface side of the sleeve while it is running.
At the same time as the grooves are polished, the protrusions of the positioning member that can gradually deepen the depth of engagement are fitted into the grooves of these V-grooves, and then the protrusions are cut.

(Example) Next, a specific example of the present invention will be described using the drawings.

FIG. 5 is a partial vertical sectional view showing the manufacturing process of the vulcanized sleeve used in the present invention, in which a canvas 5 having elasticity is attached to the circumferential surface of the cylindrical drum 20, for example, the intersection angle of the warp and weft is 90°. A bias canvas with good elasticity set at ~155° is placed in the circumferential direction of the drum 20, that is, in the longitudinal direction of the belt to be manufactured.
After wrapping multiple plies and then wrapping the upper rubber layer 6, a low elongation and high strength tensile rope 7 made of nylon, polyester, aromatic polyamide, glass fiber, etc. is wound spirally under constant tension. Furthermore, a lower rubber layer 8 thicker than the upper rubber layer 6 is laminated thereon, and an unvulcanized belt sleeve 9 is reverse-molded.

In addition, various types of short fibers may be embedded in the lower rubber layer 8 in an orientation aligned with the belt width direction, if necessary.

This unvulcanized belt sleeve 9 is vulcanized in the next vulcanization step by a known pressure and heating means to obtain a vulcanized sleeve 10 in the form of a wide flat belt. This vulcanized sleeve 10 is removed from the molding drum 20 and transferred to the next polishing step. FIG. 1 is a schematic front view of a manufacturing apparatus equipped with polishing means for forming a low-edge V-belt for carrying out the present invention. A polishing wheel 3 is provided on the surface side of the vulcanized sleeve (lower rubber layer 8 side of the vulcanized sleeve), more specifically, on either the driving drum 1 or the driven drum 2. Positioning rolls 11 are disposed at positions extending from each other.

Note that the surface of the driving drum 1 or the driven drum 2 on the side where the polishing wheel 3 is disposed is covered with a disposable protective member (not shown). As shown in FIG. 2, this polishing wheel 3 has an elongated cylindrical shape, and a plurality of V-shaped cross-section grindstones 4 are provided in the circumferential direction on the surface of the cylinder. , depending on the case, can automatically rotate in the same direction, and can gradually move in the radial direction as shown by arrow X.

On the other hand, the positioning roll 11 is disposed close to the polishing wheel 3 and immediately before the polishing wheel. More specifically, when the polishing wheel 3 is placed in contact with the drive drum 1 as shown in FIG. 1, the positioning roll 11 is also positioned on the drive drum 1. , the positioning roll 11 is supported on the same drum, and the purpose of the positioning roll can be efficiently enhanced. This positioning roll 11 has an elongated cylindrical shape similar to the polishing wheel 3, and has a group of 12 protrusions raised on the outer circumferential surface of the cylinder that has the same pitch and shape as the V-shaped grindstone on the polishing wheel 3. During polishing work on the vulcanized sleeve 10, it is configured to be pressed toward the vulcanized sleeve 10 using a known pressing means 13 such as a spring. Each protrusion 12 of this positioning roll 11 is made of rubber, synthetic resin, or metal material.

In the device having the above configuration, the drive drum 1
By rotating the vulcanizing sleeve 10, the vulcanizing sleeve 10 circulates. In this state, the polishing wheel 3
is gradually pressed against the surface of the vulcanizing sleeve 10 while rotating it in the opposite direction to the rotational direction of the drive drum 1. As a result, first, in the circumferential direction of the vulcanized sleeve, V-shaped grooves 14 are cut into the surface of the vulcanized sleeve by the V-shaped grindstone 4 of the polishing wheel 3, and between these V-shaped grooves, a circle is formed on the surface of the vulcanized sleeve. A plurality of belt compression sections 8 extending in the circumferential direction are formed. As the depth of the groove increases with the progress of the V-groove formation work using the polishing wheel 3, the positioning roll 11, which had been press-fitted in advance on the surface of the vulcanized sleeve, has a V-shaped projection 12 on the roll. They fit into the respective grooves to prevent movement of the vulcanized sleeve 10 immediately before the polishing wheel 3, thereby increasing the precision of V-groove polishing. (See Fig. 3) In this way, as shown in Fig. 3, a connecting belt 15 in which a plurality of low-edge V-belts were joined was obtained, and then each type of pitch was determined from the side where the V-groove was formed. By simultaneously cutting with multiple blades 16 or sequentially cutting with a single blade at a feeding pitch, a tensile body 7 is embedded in adhesive rubber 6 as shown in FIG. 4, and has compressed rubber 8 at the bottom. ,
A plurality of low edge V-belts 17 having the rubberized canvas 5 attached to the upper part are obtained.

(Effects) The present invention provides two vulcanized sleeves that are reverse molded and vulcanized.
While suspended on a shaft drum and circulated, V-shape polishing is performed using a polishing wheel consisting of a plurality of grindstones with a V-shaped cross section at a predetermined position on the sleeve. In addition, the cutting accuracy is improved, and the polishing efficiency is increased compared to the SCAM method, and by simply changing the distance between the drums, it is possible to polish and cut with high precision even in long sizes.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a manufacturing apparatus equipped with a polishing means of the manufacturing method according to the present invention, FIG. 2 is a partial cross-sectional view of a polishing wheel, FIG. 3 is a partial cross-sectional view showing the polishing process, and FIG. 4 5 is a perspective view of a low edge V-belt manufactured by the manufacturing method according to the present invention, and a partial vertical sectional view showing the manufacturing process of the vulcanized sleeve of FIG. 5. 1... Drive drum, 2... Driven drum, 3...
Polishing wheel, 4... V-shaped grindstone of the polishing wheel,
9... Unvulcanized belt sleeve, 10... Vulcanized sleeve, 11... Positioning roll, 12... V-shaped protrusion of positioning roll, 13... Pressing means, 14...
...V-shaped groove, 15...Connection belt, 16...Multi-blade, 17...Row edge V-belt.

[Claims]

1. Green tire handling in which an arm support frame 18 equipped with green tire gripping arms 100, 101 that can be freely expanded and contracted in the radial direction is attached to a base body 5 movable along the axis 2 of a green tire forming drum in a vertically movable manner. In the apparatus, a first arm 24 rotatable about a horizontal axis parallel to the axis 2 of the green tire forming drum is pivotally supported on the arm support frame 18, and the first arm 2
A second arm 45 having a cylindrical shaft shape rotatable around a horizontal axis perpendicular to the rotation axis of the first arm 24 is provided at one end of the arm support frame 18, and A pair of upper and lower green tire gripping arms 100 and 101 are provided on the green tire forming drum side of the second arm 45 so as to be able to expand and contract in the radial direction, and a first arm rotation mechanism that rotates the first arm 24 about its axis. Second arm rotation drive means 51, 62, 6, which includes drive means 28, 36, 39, 42, and rotates the second arm 45 about its axis.
4, 67, and the gripping arm 100, on the opposite side of the gripping arm 100, 101 of the second arm 45.
A driving body 53 that expands and contracts the driving body 5 is provided.
A green tire handling device characterized in that the green tire handling device is provided with a drive shaft 71 of No. 3 inserted into the second arm 45.