JPS5921300B2 - How to manufacture endless belts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an endless belt that is used for rotation by being wound around a plurality of rotating bodies, such as when pinching and conveying easily damaged items such as harvested agricultural products. .

For example, in a rice grass cutting and harvesting machine, in order to transport the harvested straw grass without damaging it, as shown in Fig.
A sponge strip 12 is adhered in a laminated state to the outer peripheral surface of the belt 1 to constitute an endless belt 10 having a flexible outer surface,
A pair of such endless belts 10 are arranged to be wound oppositely, and cut straw grass is held between them.

Since the sponge strip 12 used in this case is shaped into a substantially flat linear shape, in order to make it endless as described above, it must be glued along the outer circumferential surface of the base bell stitch 1, and It was necessary to butt both ends of the sponge strip 12 and adhere them. However, conventionally, both ends of the cut end of the sponge strip 12 were simply butt-glued together in a flat, linearly stretched state as shown in FIG. When the belt 10 is wound around the pulleys of the clamping and conveying device and bent at a large curvature, a large tensile force acts on the outer periphery of the sponge strip, and the protrusions at both ends of the sponge strip are removed in a relatively short period of time. There was a tendency for peeling to occur at the mating joints.

The present invention provides a method for manufacturing an endless belt that is less likely to peel off at adhesive joints even when subjected to repeated bending effects during long-term use.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a side view and a plane view of a rice straw cutting and harvesting machine as an example of a mechanical device using an endless belt obtained by the method of the present invention. After cutting the introduced straw grass A near the base with a palligan type reaping device 2, the cut straw grass A near the base is pinched from the left and right by the gripping and conveying device 3 and transported rearward and upward. The tip side is locked with a locking and conveying device 4 consisting of a chain with claws or a belt, etc., and transferred upward, and the harvested rush A is lifted and conveyed to a nearly horizontal position facing forward and backward, and then the front and back intermediate portions of the rush A are conveyed. The clamping and conveying device 5
The protrusions 7 are planted on the sorting belt 6 which is held between the upper and lower sides and conveyed in the lateral direction, and during this lateral conveyance, the sorting belt 6 rotates rearward at the lower part of the plant base side than the pinched part.・
... combs the side-transported rush grass, pulls out the short culms that are not supported by the clamping and conveying device 5 rearward, guides and releases them through the fixed guide plate 8 to the side of the machine, which is the already-cut side, and The system is configured to discharge and collect the long straw grass A that has been sorted into a gutter-like collection tool 9 disposed outside the terminal end of the clamping and conveying device 5. As mentioned above, the clamping and conveying devices 3 and 5 are configured to wind and drive a pair of endless belts 10 and 10 that are arranged opposite to each other. It is composed of

As shown in FIG. 3, the endless belt 10 is laminated on the outer circumferential surface of a base belt 11 made of an endless rubber belt integrally formed with a flat part containing a core material and a V guide part having a width of about several tens of eleven. Sponge strip 12 in the state
, 12 are adhered with an appropriate adhesive, and the outer surface of the sponge strip 12 is curved, so that the pair of endless belts 10 fit into each other on the curved outer surfaces to ensure that the grass does not fall through. It is configured so that it can be held.

The sponge strip 12 is manufactured into a substantially flat linear shape by extrusion molding or the like, and is cut into a suitable length from a long material and wound and glued around the outer peripheral surface of the endless base belt 11. , both ends of the sponge strip are butted together and glued.

In order to adhere both ends of the sponge strip 12, in the present invention, one end of the sponge strip 12 is cut diagonally at an appropriate angle α as shown in FIG. 6 while the sponge strip 12 is stretched linearly. Angle β5 smaller than this
The base belt 11 is cut diagonally at
The length of the outer peripheral surface of the sponge strip 1 should be the same as that of the sponge strip 1.
The circumferential length L2 of the outer circumferential surface of the base belt 11 is set larger than the inner circumferential length L1, and the thus cut sponge strip 12 is curved and adhered along the outer circumferential surface of the base belt 11. , and then butt and glue both ends together. In the present invention, as shown in FIG. 7, the base belt 11 is curved to the maximum curvature during use using a jig 13, and the sponge strip 12 is bent at a position corresponding to the curved outer peripheral surface of the base belt. Near both ends of the base bell opening 1 are glued, and finally the ends are butted and glued together.

When the endless belt 10 manufactured in this manner is stretched in a straight line as shown in FIG. An initial compressive deformation portion B is formed and has a slightly raised shape. Therefore, when this endless bell opening 0 is wound and tensioned around the pulley group of the clamping and conveying device 3 or 5, the endless belt 10 is curved with a small curvature at the part where the pulley is wound, and the sponge strip 12 becomes closer to the outer peripheral surface of the belt. Although it will be subjected to a large tensile stress in the circumferential direction, since an initial compressive stress is applied in advance to the connecting points at both ends of the sponge strip 12, the tensile stress is offset,
A state in which the tensile stress acting on the butt bonding surfaces is extremely small, or no tensile force is applied at all, or conversely, a state in which some compression remains is obtained, and even if the joint is repeatedly bent, it will not be in a compressed state. It is simply deformed repeatedly to a stress state close to the restoring state. In addition, as another means of applying the above-mentioned initial compressive stress when bonding the tying points, for example, it may be possible to simply extend the base belt 11 in a straight line, but in this case, It is necessary to apply a relatively large amount of compression to both ends of the sponge strip 12 while bonding, making it difficult to bond with accurate positioning.

In particular, since a strong, quick-drying adhesive is used for such bonding, the bonding cannot be repeated, and greater care is required in the bonding process. In contrast, according to the method of the present invention, the circumferential length of the outer circumferential surface is set to be larger than the circumferential length of the inner circumferential surface, and the portions near both ends of the cut sponge strip 12 are actively held in a curved posture. Since both end faces are opposed to each other in this opposed state, both end faces can be positioned approximately parallel to each other, and as a result, it is not necessary to compress or deform both end faces, or they can be easily positioned and bonded by only slightly deforming them. This made the gluing operation easier and less likely to cause gluing errors.

In addition, when both ends of the sponge strip 12 are cut at opposite angles to each other as shown in FIG. 9, the base belt 11 is bent using a jig 13 as shown in the figure, with the abutment surface as the bending point. It is best to hold it in position and glue it.

Moreover, FIG. 10 is an application example of the present invention, in which case,
The sponge strip 12 is divided into a long part 12a that is shorter than the entire length of the base bell opening 1, and a small piece part 12 corresponding to the short length.
First, the entire length of the elongated portion 12a is glued to the base belt 11, and then the other small piece portion 12b is glued so as to be embedded, with the portion corresponding to the gap curved as described above.

Note that this means can also be used for repair processing when the sponge strip 12 is locally damaged.

[Brief Description of the Drawings] Figures 1 to 10 show an embodiment of the endless belt manufacturing method according to the present invention, and Figure 1 is a schematic side view of a straw grass cutting and harvesting machine as an example of a machine using the endless belt. , second
3 is a partial perspective view of the endless belt, FIG. 4 is a plan view thereof, FIG. 5 is a side view thereof, FIG. 6 is a side view of the sponge strip, and FIG. 7 is a bonding means. FIG. 8 is a side view of the connecting part, FIG. 9 is a side view of the main part showing another form of adhesive means, and FIG. 10 is a side view of the main part showing an application form of the adhesive means. FIG. 11A and FIG. 11B are side views of main parts showing the conventional connection structure. 11...Base belt 12...Bullet band body.

Claims (1)

[Claims] 1. A method for manufacturing an endless belt that is wound around a plurality of rotating bodies and used for rotation, by bonding the end surfaces of the sponge strip 12 in abutted state, the sponge strip 12 , both end surfaces of the sponge strip 12 are formed such that the circumferential length of the outer circumferential surface is larger than the circumferential length of the inner circumferential surface, and these both end surfaces are connected in an abutting state. Hold the parts near both sides including the inner circumferential surface in a curved state in use or in a bent position with the abutting surface as the bending point so that both end faces face each other, and bond these opposing end faces together. A method for manufacturing an endless belt, which is characterized by being connected.