JP4155376B2 - Manufacturing method of toothed belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a conveyor belt, and more particularly to a method for manufacturing a toothed belt for efficiently manufacturing an endless toothed belt having a belt back surface suitable for conveyance.
[0002]
[Prior art]
As a conventional example of a manufacturing method of an endless toothed belt, for example, there is a technique described in Japanese Patent Application Laid-Open No. 55-158947 . This will be schematically described with reference to FIGS. 7 to 10. The forming wheel 1 and the tension adjusting wheel 2 constituting the main part of the apparatus are both tooth forms corresponding to the tooth form and tooth form pitch of the toothed belt of the production specification. have. By variably adjusting the position of the tension adjusting wheel 2 in advance with respect to the molding die 1 whose position of the rotation shaft does not move, the distance L between the two wheels can be set as required. By variably adjusting the inter-shaft distance L, an endless toothed belt having a required belt circumferential length can be manufactured. A reinforcing core wire 3 insert-molded as a belt reinforcing core wire is spirally wound between the two vehicles.
[0003]
Further, a molding guide device is provided in which a molding guide belt 6 is wound between three rotating rollers 5, 5 ', 5 ". This molding guide device is integrated into the molding die 1 as a whole. The part that faces the molding die 1 during rotation of the molding guide belt 6 is set to have an arc shape having a curvature larger than the die flange diameter of the molding die 1 by a predetermined dimension. That is, when the molding guide device moves to the left in the figure and approaches the molding die 1 and the molding guide belt 6 contacts the mold flange, the adjacent tooth profiles of the molding die 1 are in contact with each other. The interdental space 7 is covered from the outside by the arcuate rotating portion of the molding guide belt 6. The interdental space 7 formed in this way becomes a mold cavity.
[0004]
Further, as shown in FIGS. 8 to 10, a nozzle 8 for injecting a molten resin as a belt molding material is provided, and a discharge port of the injection nozzle 8 is covered with an arcuate rotating portion of the molding guide belt 6. It is directed toward the injection start end side of the portion that becomes the mold cavity 7.
[0005]
With the above apparatus, an endless toothed belt is manufactured in the following process. First, from the position shown in FIG. 7, when the belt is formed, the forming guide device is moved closer to the forming wheel 1 and the arcuate rotating portion of the forming guide belt 6 is moved to the forming die as shown in FIG. A mold cavity 7 is formed between several tooth forms in the mold wheel 1 by covering the cover with the mold flange of the car 1.
[0006]
The mold wheel 1 and the tension adjusting wheel 2 are rotated in the clockwise direction in the drawing. The molding guide belt 6 of the molding guide device is also rotated in the same direction. At that time, the reinforcing core wire 3 is also sent in the same direction corresponding to the rotation thereof.
[0007]
After such driving is started, molten resin of the belt molding material is sequentially injected from the injection nozzle 8 from the injection start end side of the mold cavity 7. When the molding die 1 is rotated approximately half a half after injection, the molding start end 4 of the endless toothed belt in which the reinforcing core wire 3 is insert-molded is fed from below the molding die 1 as shown in FIG. Head to the adjustment car 2.
[0008]
As shown in FIG. 10, the molding start end 4 of the endless toothed belt that has been guided by the tension adjusting wheel 2 and half-rotated is finally rotated once and reaches the molding die 1. When the molding start end 4 reaches a position where it joins the molding end, the molding start end 4 and the molding end are heated and fused by a heater device. After the fusion, when the welded portion is cooled by a cooling device or natural cooling, the production of one endless toothed belt is completed.
[0009]
In the conventional technique, there is room for improvement in the following points. In other words, when carrying an article on the back of a toothed belt, it is shaped into a concavo-convex shape or corrugated shape that can be adapted to the shape of the conveyed article rather than a smooth carrying surface on the back of the belt. Is desirable. Conventionally, as a means for forming the back surface of the toothed belt into such a concavo-convex shape or wave shape, the back surface of the ready-made toothed belt is cut into a required shape and machined, or each of the concave and convex portions or each concavo-convex portion In general, it is common to prepare a separate sheet having continuous portions and adhere or fuse it to the back of the belt. However, any means for machining, adhering or fusing the back surface of the belt is expensive, and there is a decisive difficulty that the means for adhering or fusing is particularly easy to peel off.
[0010]
[Problems to be solved by the invention]
It is an object of the present invention to set a reinforcing core wire between a pair of molding dies and to manufacture an endless toothed belt by insert molding. Another object of the present invention is to provide a method for manufacturing a toothed belt that can be simultaneously molded.
[0011]
[Means for Solving the Problems]
To manufacture the toothed belt that achieves the object of the present invention, a helical reinforcing core wire is wound between a pair of first and second molding dies provided with a tooth profile with a required tooth profile pitch on the entire circumference, and the first molding is performed. Cover the tooth profile of almost half the circumference of the mold wheel from the outside, form a mold cavity with a gap between the tooth profile, insert the molten core into the mold cavity and insert molding the reinforcing core wire, then the next molding end When the molding start end is rotated by one rotation via the second molding die and reaches the first molding die again, the molding start end is moved to the first molding die. In a method of manufacturing an endless belt by welding with a molding end portion in one molding die car, a recess-shaped conveyance surface forming hole suitable for article conveyance is formed on the outer peripheral surface facing the mold cavity of the molding guide belt. It sets the conveyance surface forming mold having It is accomplished by co-molding the conveying surface of the convex shape on the back of the endless toothed belt by the molten resin into the hole of the conveyance surface forming mold flows.
[0012]
The toothed belt according to the present invention is manufactured by winding a helical reinforcing core wire between a pair of first and second molding dies provided with a tooth profile having a required tooth profile pitch on the entire circumference, and almost the same as that of the first molding dies. A molding guide device for forming a mold cavity by a gap between the tooth profile and the tooth profile, covering a half circumference of the tooth profile from the outside, is provided. The molding guide device is provided by being wound around a plurality of rotating rollers. The belt is brought close to the first mold car to form a mold cavity. The molten resin is sequentially injected into the mold cavity while insert molding of the reinforcing core wire, and the molding start end is the first mold car. When the molding start end rotates by one rotation via the second molding die wheel and reaches the first molding die wheel again, the molding start end portion is molded in the first molding die car. By welding to the end An apparatus for producing a single toothed belt, the conveying surface forming die having a hole for the conveyance surface forming the concave shape suitable for article transport on the outer peripheral surface facing the mold cavity of the molding guide belts It is performed by simultaneously forming a convex shaped conveying surface on the back surface of the endless toothed belt by flowing the molten resin into the hole of the conveying surface forming mold.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of such a toothed belt manufacturing apparatus will be described in detail with reference to the drawings. 1 to 6, members common to the conventional apparatus shown in FIGS. 7 to 10 are denoted by the same reference numerals.
[0014]
Both the first and second molding die wheels 1 and 2 provided in this apparatus have tooth forms 1a and 2a corresponding to the tooth form and tooth form pitch of the toothed belt of the production specification. In contrast to the first molding die wheel 1 whose rotational axis is stationary, the second molding die wheel 2 is variable in position as a tension adjusting wheel (tension adjusting wheel) also shown in the conventional example, and the inter-shaft distance L between the two vehicles is set. Can be adjusted. By variably adjusting the inter-shaft distance L, a ring-shaped endless toothed belt can be manufactured. A reinforcing core wire 3 that is insert-molded as a belt reinforcing wire is spirally wound between the two vehicles.
[0015]
Further, this apparatus includes a molding guide device 20 in which a molding guide belt 6 is wound around, for example, three rotating rollers 5, 5 ', 5 ". The molding guide device 20 is integrated as a whole. The first molding die 1 can be moved closer to and away from the first molding die 1 and a part of the first shaping die 1 that faces the first molding die 1 during rotation of the molding guide belt 6 has a predetermined dimension from the die flange diameter of the first molding die 1. In other words, the molding guide device 20 moves to the left in the figure to approach the first molding die 1 and the molding guide belt 6 contacts the mold flange. Thus, the interdental space 7 between the adjacent tooth profiles 1a and 1a is covered from the outside by the arcuate rotating portion of the forming guide belt 6. Therefore, the interdental space formed as such 7 is the mold cavity in the present invention.
[0016]
Further, as shown in FIGS. 3 to 5, the present apparatus is provided with a nozzle 8 for injecting a molten resin 4 of a belt molding material, and the discharge port of the injection nozzle 8 is rotated in an arc shape of the molding guide belt 6. This is directed to the injection start start side of the portion that is covered with the portion and becomes the mold cavity 7.
[0017]
Further, this apparatus is provided with a conveyance surface forming die 21 as a gist of the present invention in a hole 22 as shown in FIG. 2, for example, on the outer peripheral surface of the molding guide belt 6 of the molding guide apparatus 20. The convex portion 33 suitable for article transportation is provided on the back surface of the endless toothed belt 30 after molding.
[0018]
With the above configuration, the endless toothed belt 30 is manufactured by the following process. First, as shown in FIG. 1, when forming the belt, the forming guide device 20 is moved closer to the first forming die wheel 1, and the conveying surface forming die provided on the outer peripheral surface of the forming guide belt 6. 21 is brought into contact with the mold flange of the first molding die 1. Thereby, a mold cavity 7 is formed between several tooth forms 1a and tooth forms 1a.
[0019]
The first molding die wheel 1 and the second molding die wheel 2 are rotated in the clockwise direction in the figure. The molding guide belt 6 of the molding guide device 20 is also rotated in the same direction. At that time, the reinforcing core wire 3 is also sent in the same direction corresponding to the rotation thereof.
[0020]
After such driving is started, the molten resin 4 of the belt molding material is sequentially injected from the injection nozzle 8 to the injection start side of the mold cavity 7. After the injection, when the first molding die 1 is rotated approximately half a turn, the molding start end portion of the endless toothed belt 30 in which the reinforcing core wire 3 is insert-molded is sent out from below the first molding die 1 as shown in FIG. , Head to the second mold car 2.
[0021]
At this time, the tooth profile 32 starts to be formed in the belt main body 31 at the molding start end of the endless toothed belt 30. At the same time, a convex portion 33 suitable for article conveyance is simultaneously formed on the back surface of the belt main body 31 by the hole 22 of the conveyance surface forming die 21 provided on the outer peripheral surface of the forming guide belt 6, and these are formed subsequently. Is done.
[0022]
As shown in FIG. 5, the molding start end portion of the endless toothed belt 30 that has been guided by the second molding die 2 and half-rotated is finally rotated by one track, as shown in FIG. 1 is reached. When the molding start end reaches a position where it joins the molding end, it is connected endlessly by fusing with the heat of the molding end. After fusion, when the welded portion is cooled by a cooling device or natural cooling, the pitch between the tooth profile 32 and the tooth profile 32 is constant over the entire endless length and does not vary. The manufacture of the endless toothed belt 30 having the convex portion 33 suitable for article conveyance on the back surface of 31 is completed.
[0023]
In addition, in the manufacturing apparatus of this embodiment, what formed the conveyance surface formation type | mold 21 using the outer peripheral surface of the shaping | molding guide belt 6 was shown, However, The hole 22 pattern shown in FIG. A structure in which the conveyance surface forming belt is disposed along the outside of the forming guide belt 6 and the both belts are integrally rotated is also possible. In this case, the convex portion 22 is shown, but it is also possible to use a conveyance surface with a concave portion 22 pattern instead.
[0024]
Further, by forming a cloth fabric having a surface state desired to be attached to the back surface of the belt while being arranged as shown in FIG. 1, protrusions suitable for conveyance can be formed on the back surface of the belt. Further, the second mold belt 6 may be either endless or open roll.
[0025]
【The invention's effect】
In the method for manufacturing a toothed belt according to the present invention, during the molding of an endless toothed belt, the back surface of the toothed belt can be simultaneously formed into a shape suitable for article transportation. There is an advantage that it can be remarkably reduced as compared with the manufacturing cost when it is machined or provided by bonding and fusing.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of an apparatus used for manufacturing a toothed belt according to the present invention.
FIG. 2 is a plan view showing an example of a shape suitable for conveying an article that is simultaneously formed on the back surface of a belt in the embodiment of the manufacturing apparatus.
FIG. 3 is an explanatory view showing a state immediately after pouring molten resin in the embodiment of the manufacturing apparatus.
FIG. 4 is an explanatory view showing a state immediately after the forming start end portion is sent out from the forming die wheel in the embodiment of the manufacturing apparatus.
FIG. 5 is an explanatory view showing a state in which a molding start end portion has made one rotation and reaches a molding end portion in the embodiment of the manufacturing apparatus.
FIG. 6 is a front view (a), a side view (b) and a plan view (c) showing an endless toothed belt formed in the embodiment of the manufacturing apparatus.
FIG. 7 is an explanatory view showing an apparatus for manufacturing an endless toothed belt according to a conventional example.
FIG. 8 is an explanatory view showing immediately after injection of molten resin in a conventional example.
FIG. 9 is an explanatory view showing a state immediately after the forming start end portion is sent out from the forming die wheel in the conventional example.
FIG. 10 is an explanatory view showing a state in which a molding start end portion makes one rotation and reaches a molding end portion in a conventional example.
[Explanation of symbols]
1, 2 1st, 2nd molding wheel 1a, 2a Tooth profile 3 Reinforcement core wire 4 Molten resin 5 Rotating roller 6 Molding guide belt 7 Mold cavity 8 Injection nozzle 20 Molding guide device 21 Conveying surface forming die 22 Conveying surface forming hole 30 Shaped endless toothed belt 31 Belt body 32 Tooth profile 33 Conveying convex part on the back of the belt

Claims (2)

A spiral reinforcing core wire is wound between a pair of first and second molding wheels provided with a tooth profile with a required tooth profile pitch on the entire circumference, and the tooth profile of the first molding wheel is covered from the outside with a tooth profile covering almost half of the circumference. A mold cavity is formed between the tooth profile and a cavity, and a molten core is poured into the mold cavity while insert molding of the reinforcing core wire, and the molding start end is fed in the rotational direction of the first molding die wheel, and the molding start end Is rotated by one rotation via the second molding die wheel and reaches the first molding die wheel again, by welding the molding start end portion with the molding end portion in the first molding die wheel, thereby the endless belt. In the method of manufacturing
The molded guide conveying surface forming die having a hole for the conveyance surface forming the concave shape suitable for article transport on the outer peripheral surface facing the mold cavity is provided, the melt in the holes of the conveyance surface forming die A method of manufacturing a toothed belt, wherein a convex shaped conveying surface is simultaneously formed on the back surface of an endless toothed belt by flowing resin . The method for manufacturing a toothed belt according to claim 1, wherein a convex-shaped conveyance surface is simultaneously formed on the back surface of the endless toothed belt while arranging the cloth fabric on the back surface of the belt by the conveyance surface forming mold.

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