JPH10296746A - Method and device for releasing belt slab from mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold releasing method and a mold releasing device thereof for a belt slab to be release from a mold in which the forcible deformation and damage are hard to be generated to a helically toothed belt teeth at the time of mold releasing. SOLUTION: A belt slab BS molded between an inner mold 1 of sectional circular shape with a helical groove 10 for forming belt teeth on an outer peripheral face and a cylindrical outer mold encircling the inner mold is released from the inner mold 1 after the inner mold 1 and the outer mold are separated each other in a mold releasing method. In the mold releasing method, while the face of the belt slab BS is kept immovable by a belt presser 3 and the inner mold 1 is moved linerly in the mold axial line L direction in compliance with the inclination of the helical groove 10 in the state of keeping the outer face of the belt slab, the inner mold is revolved with the mold axial line L as its center. A mold releasing device is provided with the belt presser 3 for fixing and keeping the belt slab BS immovable by being brought into contact with the outer face of the belt slab BS and a moving means 4 for revolving the inner mold 1 as the mold axial line L with its center while moving linearly the inner mold in the mold axial line L direction in compliance with the inclination of the helical groove 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a helical belt used for transferring a carriage of a copying machine or a printer, and more particularly, to removing a molded and vulcanized belt slab from an inner die. And a method and apparatus for performing the method.

[0002]

2. Description of the Related Art A toothed belt having straight teeth (hereinafter referred to as a straight tooth belt) fills a gap between a cylindrical inner mold and a cylindrical outer mold surrounding the inner mold with an elastomer or the like. It is manufactured by pressing together with
In order to form the teeth immediately, longitudinal grooves for forming belt teeth are formed on the outer surface of the inner mold in parallel with the axis of the inner mold. Then, the belt slab is left in the inner mold
Separation of the belt slab and the inner mold after the outer molds were separated from each other was performed by pushing up the inner mold in the axial direction of the inner mold while holding the belt slab with a plurality of belt presses. .

However, in the case of manufacturing a toothed belt having helical teeth (hereinafter referred to as a helical belt), in the conventional method, the spiral direction of the helical teeth and the relative movement direction between the inner and outer dies are known. Therefore, the belt teeth were to be heavily burdened when the mold was removed from the mold. In the helical belt manufactured in this way, the shape of the belt teeth is no longer maintained in a highly accurate state,
As a result, the smoothness of the engagement with the pulley, which is a feature of the present belt, is impaired.

[0004] Such a problem occurs irrespective of whether or not there is canvas on the tooth surface of the belt.

[0005] In recent years, it has been required that the toothed belt be driven with high precision, so that the belt slab metal which is unlikely to cause excessive deformation force or damage to the helical belt teeth during removal from the mold is required. There is a need for a method and apparatus for demolding from a mold.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method and an apparatus for removing a belt slab from a mold, which are unlikely to cause excessive deformation force or damage to the helical belt teeth at the time of removal from the mold. That is the task.

[0007]

According to the first aspect of the present invention, there is provided an inner mold 1 having a circular cross section having a spiral groove 10 for forming belt teeth formed on an outer peripheral surface thereof, and a cylindrical outer mold surrounding the inner mold. Mold 2
In the method of separating the inner and outer molds 1 and 2 from the inner mold 1 after separating the belt slab BS molded between the inner mold 1 and the outer mold 1, the outer surface of the belt slab BS is immovable by the belt presser 3. The spiral groove 1 is held in this holding state.
The inner mold 1 is rotated about the mold axis L while linearly moving the inner mold 1 in the mold axis L direction corresponding to the inclination of 0.

According to a second aspect of the present invention, an inner mold 1 having a circular cross section having a spiral groove 10 for forming belt teeth formed on an outer peripheral surface thereof and a cylindrical outer mold 2 surrounding the inner mold 1 are provided. In the apparatus for separating the inner and outer molds 1 and 2 from the inner mold 1 after separating the belt slab molded in the above, the belt slab BS is immovable by contacting the outer surface of the belt slab BS. A belt holder 3 for fixing and holding; and a moving means 4 for rotating the inner mold 1 about the mold axis L while linearly moving the inner mold 1 in the mold axis L direction corresponding to the inclination of the spiral groove 10. Shall do.

The invention according to claim 3 relates to the invention according to claim 2, wherein the inner mold 1 is suspended by suspending means, and the inner mold 1 is moved to the belt slab BS by moving means 4.
At the same time as being pushed up in the direction of the mold axis L by the suspending means.

The invention according to claim 4 relates to the invention according to claim 2, wherein the lifting speed of the inner mold 1 by the moving means 4 and the lifting speed of the inner mold 1 by the suspending means are substantially matched. .

The method and apparatus for removing the belt slab from the mold according to the present invention will be described in the following embodiments of the present invention.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for removing a belt slab from a mold according to an embodiment of the present invention will be described in detail with reference to the drawings. (Embodiment 1) The helical belt 9 shown in FIG.
From the tooth surface 91 to the tooth surface 91, and the uneven surface on the tooth surface 91 side is made of a canvas 93.
And a plurality of core wires 92 extending in the longitudinal direction of the belt are embedded.

The urethane elastomer is composed of 100% by weight of a urethane prepolymer, 20% by weight of a plasticizer, and a curing agent.
The core wire 92 is made of Kevlar fiber (aramid fiber manufactured by DuPont). The plasticizer may be in the range of 10 to 30% by weight, and the curing agent may be in the range of 8 to 20% by weight.

The canvas 93 is made of nylon 6, nylon 66, etc., both sides of which are coated with latex, and the amount of latex attached is about 50 to 50% of the weight of the base cloth.
It is assumed to be 200% by weight, and after being coated with latex, coated with resorcinol-formalin latex.

The core wire 92 is not limited to Kevlar fiber or the like, and may be any wire having high tensile strength.

Next, the manufacture of the above-mentioned helical belt 9 will be described. The raw material in the first step is immersed in a latex solution, squeezed by passing between a pair of rolls, and then dried. At this time, the solid adhesion amount of latex is set at 50 to 200% by weight based on the weight of the raw material.

The type of the latex is not particularly limited, but preferably a self-crosslinking latex which forms a flexible film which does not impair the stretchability of the canvas 93 and which has a high film strength when forming teeth. The latex may be a single latex, and if necessary, a vulcanizing agent, a vulcanization accelerator, an antioxidant and the like may be added. Second Step Next, the latex-treated canvas 93 is further subjected to RFL treatment for forming an adhesive layer. The processing steps are the same as for latex. The RFL solution is obtained by mixing an initial mixture of resorcinol and formalin (RF solution) with latex. Third Step As shown in FIG. 2, between a pair of upper and lower mold plates 5a and 5b each having a plurality of nested tooth profiles on the inner contact surface.
The canvas 93 is positioned. The canvas 93 is mounted on the molding boards 5a, 5a.
b, and a toothed canvas 93a having shape retention as shown in FIG. 3 is molded by a known method. Next, it is cut into a predetermined number of teeth so as to be compatible with the inner mold 1, and is subjected to endless processing into a cylindrical shape by bonding or fusing by a hot press. Fourth Step The cylindrical toothed canvas 93a produced in the third step is
As shown in (1), it is fitted into a cylindrical inner mold 1 having a spiral groove 10 for forming belt teeth formed on the outer peripheral surface. Fifth Step A core wire 92 is spirally wound around the surface of the toothed canvas 93a mounted on the cylindrical inner mold 1 (see FIG. 5). Sixth Step When the toothed canvas 93a and the core wire 92 have been mounted on the inner mold 1, the inner mold 1 is inserted into the cylindrical outer mold 2 as shown in FIG. The two ends of the outer mold 2 are closed and fixed by upper and lower lids 20 and 21. After heating the inner and outer molds 1 and 2 to 100 ° C., the liquid urethane elastomer UE in the casting container 22 is heated.
Is pressurized by the piston 23 at a pressure of ² kgf / cm ² or less, and the space K is filled with the liquid urethane elastomer UE through the casting tube 24. When the space K is filled with the liquid urethane elastomer UE, the degassing holes 25 of the upper lid 20 are formed.
The liquid urethane elastomer UE flows out of the container, and at the time when the liquid urethane elastomer UE flows out, an opening / closing screw 26 is screwed into the deaeration hole 25, the deaeration hole 25 is sealed, and 110 ° C., 120 minutes, 10 to 30K.
Press molding at gf / cm ² . And inner and outer molds 1, 2
After forming the belt slab BS, the upper and lower lids 20 and 21 are removed, and the inner and outer dies 1 and 2 are separated. In this state, the belt slab BS remains on the inner mold 1 side in such a manner that the belt teeth are fitted into the spiral grooves 10. At the end of the seventh step , after removing the belt slab BS from the inner mold 1,
The helical belt 9 is completed by cutting to a desired width.

Here, as shown in FIGS. 6 to 9, a demolding device for demolding the belt slab BS from the inner mold 1 includes four belt slabs for holding the outer surface of the belt slab BS immovably. And a moving means 4 for rotating the inner mold 1 about the mold axis L while linearly moving the inner mold 1 in the mold axis L direction in accordance with the inclination of the spiral groove 10. You are using

As shown in FIGS. 6 and 7, the belt retainer 3 is configured such that a vertically long plate 31 is attached to the tip of the output shaft 30a of the hydraulic cylinder 30. It is curved so that it contacts the belt slab BS integrated with the mold 1 over the entire surface. Note that the output section of the belt presser 3 is not limited to a hydraulic pressure, but may be a hydraulic pressure or the like. However, in order to keep the belt slab BS held by the belt presser 3 even after the belt slab BS moves the inner mold 1, it is preferable that a plurality of pressing force directions are set so as to pass through one point.

The moving means 4 is, as shown in FIGS.
It has a mold table 41 and a rotation elevating mechanism 40 for rotating and lifting the mold table 41. The diameter of the mold table 41 is set to be slightly smaller than the diameter of the inner mold 1. . Here, the above-mentioned rotary elevating mechanism 40 is
As shown in FIG. 9, a ball screw 40 a that is vertically provided on the lower surface of the mold table 41 and has an inclination angle of the screw equal to the inclination angle of the spiral groove 10, movably holds the ball screw 40 a, and is attached to the fixing portion. The ball screw guide 40b, the spline shaft 40c connected to the ball screw 40a, and the spline shaft 4
0d is a driven pulley 40d which is fitted on the outside so as to be movable up and down.
And a drive pulley 40e rotated by a motor M
And a power transmission belt 40f stretched between the driven pulley 40d and the driving pulley 40e. The inner mold 1 and the mold table 41 may be integrated or separate, and the ball screw 40a and the spline shaft 40c may be integrated or detachable.

Next, when the belt slab BS is released from the inner die 1 by using this release device, the die table 41 is used.
The inner mold 1 is placed and fixed on the mold table 41 in such a manner that the rotation center line of the inner mold 1 and the mold axis L of the inner mold 1 coincide with each other.
The inner die 1 is firmly pressed and held by the individual belt holders 3. In this state, when the drive table 40 is rotated and the mold table 41 is rotated and raised (or lowered) by rotating the drive pulley 40e, only the inner mold 1 moves upward as shown by a two-dot chain line in FIGS. The belt slab BS remains,
If it is moved further, the demolding is completed. Here, since the inclination angle of the screw of the ball screw 40a is made equal to the inclination angle of the spiral groove 10, the inner mold 1 is rotated by the presence of the rotatable mold table 41 when the mold is removed. Will rise while rotating following the formation trajectory of
Excessive deformation force acting on the helical belt teeth and scratching are suppressed. The above-described rotary elevating mechanism 40 is not limited to the above-described type, and may be configured to synchronize the rotation and elevation of the mold table 41 with another driving source so as to perform the above operation. Good.

Here, since the inner mold 1 is gradually inclined during the ascent, it is suspended by a chain via a hook (not shown) bolted to the upper surface of the inner mold 1 (the hook and the chain are problematic). (Corresponding to the suspending means described in the section of means for solving the problem). In addition, the lifting speed of the inner mold 1 by the moving means 4 and the lifting speed of the inner mold 1 by the suspending means are substantially the same, and the suspending means rotates in accordance with the rotation of the moving means 4. It works. (Embodiment 2) Next, a method for manufacturing a rubber belt 8 having helical teeth shown in a sectional view in FIG. First Step As shown in FIG. 10, a cylindrical canvas 80 is extrapolated to the outer periphery of the inner mold 1 having the spiral groove 10. In this state, as shown in FIG. 11, the canvas 80 is in a state of being in contact only with the protrusion between the spiral grooves 10, 10.

The canvas 80 is made of nylon 6, nylon
What has excellent elasticity, such as Ron 66, is used.Second step As shown in FIG. 12, Kevlar fiber and the like have excellent tensile strength.
The core wire 81 is spirally wound from above the canvas 80.Third step As shown in FIG. 13, a sheet-like rubber
The material 82 is wound. 4th process As shown in FIG. 14, the inner mold 1, the canvas 80, the core wire 81,
The rubber material 82 is integrated with the vulcanizing can 2a (together with the outer mold 2).
And heat and pressurize the integrated material
Vulcanize. In this state, as shown in FIG.
0 and a part of the rubber material 82 penetrate into the spiral groove 10 of the inner mold 1.
And the belt slab BS is formed.
ing. In addition, the inside of the through hole 11 of the inner mold 1 is heated.
As a result, the tooth flank side of the belt slab BS
Vulcanize and harden the teeth.Fifth step After the end of the fourth step, the inner mold 1, canvas 80, core wire 81, rubber
The one piece of the material 82 is taken out from the vulcanizing can 2a. And inside
Remove upper and lower plates 1a and 1b (see FIG. 10) from mold 1.
After that, similarly to the first embodiment, as shown in FIGS.
The slab BS is pressed and held by the belt holder 3,
Using the moving means 4, the inner mold 1 is extracted. Therefore,
At the time of demolding, as in the first embodiment, the helical belt teeth
Do not apply excessive deformation force or damage the
Is controlled.

FIG. 16 shows a cross section of a rubber belt 8 having helical teeth manufactured by this method. (Other Embodiments) In the above embodiment, the helical tooth belt having the canvas on the tooth surface has been described. However, the same effect can be obtained with the helical tooth belt having no canvas.

In the above embodiment, the inner mold 1 is pushed up by the moving means 4, but the invention is not limited to this. The inner mold 1 may be pushed down by the moving means 4, and the inner mold 1 may be pulled. The inner mold 1 may be moved by force.

[0026]

According to the embodiments of the present invention, at the time of demolding,
A method and an apparatus for removing a belt slab from a mold, which hardly cause excessive deformation force and damage to the helical belt teeth, can be provided.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a helical belt.

FIG. 2 is a perspective view of a pair of upper and lower molding boards used for manufacturing the helical belt.

FIG. 3 is a perspective view of a toothed canvas formed by the molding board.

FIG. 4 is a perspective view showing a state in which a toothed canvas is mounted on an outer surface of an inner mold used for manufacturing the helical belt.

FIG. 5 is a cross-sectional view showing a state in which a liquid urethane elastomer is filled in a space formed between the inner and outer molds in the helical belt manufacturing process.

FIG. 6 is a perspective view of a removal device according to the embodiment of the present invention.

FIG. 7 is a top view of the demolding device.

8 is a longitudinal sectional view of the demolding device shown in FIG.

FIG. 9 is a conceptual diagram of a rotary elevating mechanism in the removal device.

FIG. 10 is an explanatory diagram of an operation of extrapolating a canvas into an inner mold.

FIG. 11 is a sectional view showing a state in which a canvas is extrapolated to an inner mold.

FIG. 12 is an external perspective view showing an operation of winding a core wire from above the canvas.

FIG. 13 is an external perspective view showing an operation of winding a sheet-like rubber material from above the core wire.

FIG. 14 is an external perspective view showing a state where the inner mold is housed in a vulcanizing can.

FIG. 15 is a sectional view showing a state of an inner mold, a canvas, a core wire, a rubber material, and the like when the inside of the vulcanization can is heated and pressurized.

FIG. 16 is a cross-sectional view of a rubber belt having helical teeth.

[Explanation of symbols]

 BS Belt slab L Mold axis 1 Inner mold 2 Outer mold 3 Belt holder 4 Moving means 10 Spiral groove

Claims (4)

[Claims] A spiral groove (1) for forming belt teeth is formed on an outer peripheral surface.
The belt slab (BS) molded between the inner mold (1) having a circular cross section on which the above (0) is formed and the cylindrical outer mold (2) surrounding the inner mold (1) is inserted into the inner and outer molds. (1) (2) In the method of releasing from the inner mold (1) after separating each other, the outer surface of the belt slab (BS) is immovably held by the belt presser (3). In accordance with the inclination of the spiral groove (10), the inner mold (1) is rotated about the mold axis (L) while linearly moving the inner mold (1) in the mold axis (L) direction. To remove the belt slab from the mold. 2. A helical groove (1) for forming belt teeth on the outer peripheral surface.
A belt slab molded between an inner mold (1) having a circular cross section on which the above (0) is formed and a cylindrical outer mold (2) surrounding the inner mold (1) is formed into an inner / outer mold (1). (2) In a device for removing the inner mold (1) from the inner mold (1) after separating them from each other, a belt retainer (3) for fixing the belt slab (BS) immovably by contacting the outer surface of the belt slab (BS) )
And the inner die (1) corresponding to the inclination of the spiral groove (10).
Moving means (4) for rotating the belt slab about the mold axis (L) while linearly moving the belt slab in the direction of the mold axis (L). 3. The inner mold (1) is suspended by suspending means, and the inner mold (1) is suspended with respect to the belt slab (BS).
The lifting means is lifted in the direction of the mold axis (L) by the moving means (4), and is simultaneously lifted by the hanging means by the same amount as the lifting amount.
A device for removing the belt slab from the mold as described. 4. The lifting speed of the inner mold (1) by the moving means (4) and the lifting speed of the inner mold (1) by the hanging means are substantially matched.
A device for removing the belt slab from the mold as described.