JP6017903B2 - Endless belt manufacturing apparatus and manufacturing method thereof - Google Patents

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless belt manufacturing apparatus and a manufacturing method thereof, and in particular, an endless belt manufacturing apparatus and a manufacturing method thereof capable of shortening a molding time of a toothed endless belt such as a timing belt and an electric V belt It is about.

Conventionally, when molding an endless belt, there is a method of supplying a molding material for the endless belt to a belt molding space formed between an outer mold and an inner mold arranged concentrically.
An outline of the toothed endless belt 1 will be described with reference to FIGS. 9 and 10.
FIG. 9 is a perspective view of a general toothed endless belt 1, and FIG. 10 is a schematic perspective view of a manufacturing apparatus 2 (molding apparatus) for the toothed endless belt 1, where the toothed endless belt 1 is endless. Belt body 3 and reinforcing fiber 4 embedded in the inner peripheral wall surface of belt body 3.

    On the inner peripheral wall surface of the endless belt 1 with teeth, as shown in an enlarged view in FIG. 9, engaging teeth 5 composed of uneven portions are formed, and a gear or a pulley (not shown) is formed. Engagement is possible.

A manufacturing apparatus 2 for a toothed endless belt 1 has an outer mold 6 and an inner mold 7 arranged concentrically, and a mold release agent is applied to the outer peripheral surface of the inner mold 7, and the outer mold 6 and the inner mold are applied. The molding material of the toothed endless belt 1 is supplied to the belt molding space 8 formed between 7 and molded.
On the outer peripheral wall surface of the inner mold 7, as shown in an enlarged view in FIG. 10, an engagement tooth molding groove 9 formed of an uneven portion for molding the engagement tooth 5 of the toothed endless belt 1. Is forming.

    However, the conventional manufacturing apparatus 2 for the toothed endless belt 1 employs a method of injecting a molding material into the belt molding space 8 (for example, Patent Document 1), and a thermosetting elastomer is used as the molding material. Therefore, there is a problem that heat treatment for a long time is necessary to cure the molded body.

On the other hand, if a manufacturing apparatus using an injection molding method capable of shortening the molding time is adopted, the molding time can be shortened, but after molding, the belt molded body is inserted with the outer mold 6 removed (mold open state). Removal from the mold 7 is virtually impossible.
In particular, since the reinforcing fiber 4 is embedded in the inner peripheral wall surface of the molded belt body 3 and the inner mold 7 is tightened, there is a problem that it is difficult to remove the belt body 3 from the inner mold 7.
Therefore, it is necessary to die-cut the inner die 7 from the outer die 6 by a considerable extrusion force without damaging the belt molding, and there is a problem that this die-cutting process takes time and effort.

JP-A-2-167773

    The present invention has been considered in view of the above problems, and it is an object of the present invention to provide an endless belt manufacturing apparatus and a manufacturing method thereof capable of forming a toothed endless belt and other endless belts in a shorter time than conventional. To do.

    It is another object of the present invention to provide an endless belt manufacturing apparatus and a manufacturing method thereof that can efficiently perform a die-cutting operation of an inner mold from an outer mold even when an injection molding method is employed.

    Another object of the present invention is to provide an endless belt manufacturing apparatus capable of manufacturing an endless belt at a low cost by shortening the molding time and a manufacturing method therefor.

    That is, the present invention focuses on adopting an injection molding method for molding an endless belt, and allowing the belt molded body of the endless belt to remain in the outer mold when the inner mold is removed from the outer mold. A first invention includes an outer mold and an inner mold arranged concentrically, and a fixed platen having a supply port for supplying a molding material of an endless belt to a belt molding space formed between the outer mold and the inner mold. An endless belt manufacturing apparatus having a movable plate that moves forward and backward relative to the fixed platen, wherein the belt forming space is provided between the outer die and the inner die facing the supply port of the fixed platen. A flange capable of forming a constricted path that communicates with each other, and a belt-molded body of the endless belt that is molded in the belt-forming space, and a flange that can form a circumferential flange at the end of the belt located on the movable platen side Part formation An apparatus for manufacturing an endless belt, characterized in that a recess can be formed in the outer mold so as to communicate with the belt molding space, and the inner mold can be removed from the outer mold by the movable platen. .

    A second invention includes an outer mold and an inner mold arranged concentrically, and a fixed platen having a supply port for supplying a molding material for an endless belt to a belt molding space formed between the outer mold and the inner mold. An endless belt manufacturing method using a movable plate that moves forward and backward with respect to the fixed platen, wherein the belt forming space is provided between the outer die and the inner die facing the supply port of the fixed platen. Forming a constricted path to be communicated, forming a flange forming recess in the outer mold on the movable platen side to communicate with the belt molding space, and supplying the molding material from the supply port via the constricted path; The belt molded body of the endless belt to be injected and supplied to the belt molding space and molded in the belt molding space has a circle corresponding to the flange forming recess at the belt end located on the movable platen side. Circumferential direction Forming an intermediate portion, and cutting the inner mold from the outer mold by the movable platen to cut off the narrowed material portion of the molding material in the narrowed path, and integrally with the outer circumferential flange portion. The belt molded body of the endless belt molded on the inner peripheral side of the mold is left, the movable plate is separated from the outer mold, and the molded belt molded body of the endless belt is removed from the outer mold. This is a method for producing an endless belt.

    The movable plate can be configured such that the outer mold and the inner mold can advance and retreat with respect to the fixed plate.

    The movable plate can be equipped with an extrusion pin that enables the inner die to be punched from the outer die toward the fixed plate.

    In the state where the inner mold is removed from the outer mold, the belt molded body of the endless belt molded on the inner peripheral side of the outer mold can remain.

    In a state where the inner mold is removed from the outer mold, the movable board can be separated from the outer mold.

    The outer mold is formed with an inward flange-like projecting portion capable of forming the narrowed path at the fixed platen side end facing the fixed platen, and at the movable platen side end facing the movable platen. A concave portion for forming the flange portion can be formed.

    The outer mold may have a fixed platen side opening corresponding to a side opening portion of the endless belt with respect to the fixed platen, and a movable platen side opening facing the movable platen. .

    The movable board can have an intermediate board for attaching and detaching the outer mold to and from the movable board.

    The inner mold may include a fixed platen side shaft portion that engages and disengages with the fixed plate engaging recess portion of the fixed platen, and a movable platen side shaft portion that engages and disengages with the movable plate engaging recess portion of the movable platen. .

    In the inner mold, the reinforcing fibers of the endless belt can be wound in the circumferential direction.

    As the molding material, a thermoplastic elastomer is generally used, but a thermosetting elastomer can also be adopted by appropriately selecting processing conditions and processing time.

In the endless belt manufacturing apparatus and the manufacturing method thereof according to the present invention, a narrow path communicating with the belt molding space is formed between the outer mold and the inner mold facing the molding material supply port of the endless belt, and the movable platen A flange-forming concave portion capable of forming a circumferential flange portion was formed in the outer mold at the belt end located on the side.
Therefore, when the movable platen is retracted from the fixed platen (opens the mold), the belt molded product is torn off in the narrow path, so there is a possibility that the belt molded product may be damaged even if the outer mold and the inner mold are separated from the fixed platen. Absent.
Furthermore, since there is a circumferential flange portion in the belt molded body, this circumferential flange portion can be caught in the concave portion for forming the flange portion of the outer mold, and the inner mold can be smoothly removed from the outer mold, A belt molded body of an endless belt can remain in the outer mold.
It is easy to take out a belt molded body of an endless belt from the outer mold, and it is possible to reduce the cost by reducing the processing time and labor saving of the endless belt.

    In particular, the endless belt manufacturing apparatus of the first invention has an outer mold and an inner mold, a fixed platen and a movable platen, and communicates with the belt molding space to form a narrow path and a circumferential flange portion. Therefore, it is possible to take advantage of the injection molding method by removing the inner mold from the outer mold while leaving the belt molded body of the endless belt in the outer mold.

    In particular, in the endless belt manufacturing method of the second invention, the molding material is injected and supplied from the supply port to the belt molding space through the narrow path, and the circumferential flange portion is formed on the endless belt molded in the belt molding space. The inner mold is removed from the outer mold by the movable plate, the belt molded body of the endless belt molded on the inner peripheral side of the outer mold is left, and the movable plate is separated from the outer mold and molded. Since the endless belt molding is taken out from the outer mold, it is possible to manufacture by taking advantage of the injection molding method with a short molding time and cooling time.

It is a schematic sectional side view of the mold split state (mold open state) of the manufacturing apparatus 10 of the endless belt (toothed endless belt 1) according to the embodiment of the present invention. It is a schematic sectional side view of the clamping state of the manufacturing apparatus 10 of the toothed endless belt 1. FIG. 2 is a schematic side sectional view showing a state (first mold opening state) in which the movable mold 12 separates the outer mold 13, the inner mold 14, and the belt molded body 1 </ b> A of the toothed endless belt 1 from the stationary platen 11. In the same manner, the movable platen side shaft portion 33 of the inner mold 14 is pushed in the direction of the fixed platen 11 by the pushing pin 21 in the movable platen 12, and the inner die 14 is die-cut from the outer die 13 by almost half the length (second state). It is a schematic sectional side view which shows a mold open state. FIG. 6 is a schematic side cross-sectional view showing a state (third mold open state) in which the inner die 14 having a half of the length opened is manually completely pulled out from the outer die 13. FIG. 6 is a schematic side sectional view showing a state (fourth mold opening state) in which the movable platen 12 (intermediate platen 20) is separated from the outer die 13 while the inner die 14 is removed from the outer die 13; FIG. 4 is a schematic side cross-sectional view showing an operation for manually taking out the belt molded body 1A of the molded endless belt 1 with teeth from the outer mold 13; 2 is a schematic sectional side view of a belt molded body 1A of a toothed endless belt 1 taken out from the outer mold 13. FIG. 1 is a perspective view of a general toothed endless belt 1. FIG. It is a schematic perspective view of the manufacturing apparatus 2 (molding apparatus) of the toothed endless belt 1.

    The present invention employs an injection molding method for molding an endless belt, forms a narrowed path and a circumferential flange portion in communication with the belt molding space, and removes the inner mold from the outer mold. Since an endless belt molded body can remain, an endless belt manufacturing apparatus and a manufacturing method thereof that can reduce the molding time and manufacture an endless belt at low cost have been realized.

Next, an endless belt manufacturing apparatus 10 and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8 by taking the case of a toothed endless belt 1 as an endless belt. However, the same parts as those in FIGS. 9 and 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.
FIG. 1 is a schematic side sectional view of a mold splitting state (die opening state) of a manufacturing apparatus 10 for an endless belt (toothed endless belt 1), and FIG. 2 is a mold clamping state of the manufacturing apparatus 10 for a toothed endless belt 1. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side sectional view showing a toothed endless belt manufacturing apparatus 10 including a fixed platen 11 and a movable platen 12, and an outer mold 13 and an inner mold 14 arranged concentrically between the fixed platen 11 and the movable platen 12 Have.

The fixed platen 11 is connected to a belt material injection unit (not shown), and forms a supply port 15 for supplying (injecting) the molding material of the toothed endless belt 1. The supply port 15 includes an injection port 16 formed through the fixed platen 11 and a runner 17 formed between the fixed platen 11 and the outer mold 13 and the inner mold 14 in a mold clamping state.
The fixed platen 11 has a fixed plate engaging recess 18 formed in the central shaft portion thereof.

    The movable platen 12 is connected to a mold clamping drive unit (not shown), and moves forward and backward in the axial direction of the outer die 13 and the inner die 14 (left and right in FIG. 1) with respect to the fixed platen 11. By doing so, the outer mold 13 and the inner mold 14 can be moved back and forth (clamping and mold opening) with respect to the fixed platen 11, and have a movable portion 19, an intermediate plate 20, and an extrusion pin 21.

In particular, as will be described later with reference to FIG. 4, the inner mold 14 can be removed from the outer mold 13 by the movable platen 12 (extrusion pin 21).
The movable portion 19 drives the movement of the entire movable platen 12, the intermediate plate 20, and the push pin 21.
The intermediate board 20 is located between the outer mold 13 and the movable part 19, attaches and detaches the outer mold 13 with respect to the movable part 19 (movable board 12), and is movable as a movable board 12 at the central axis portion thereof. A panel engaging recess 22 is formed.
The push pin 21 can advance and retreat in the axial direction of the outer mold 13 and the inner mold 14 in the central hole portions of the movable portion 19 and the intermediate plate 20, and the inner die 14 is moved from the outer die 13 toward the fixed platen 11 by hydraulic pressure. Extrusion and die cutting are possible (see FIG. 4, described later).

    In particular, as shown in FIG. 2, a bottomed cylindrical belt molding space 23 can be formed between the outer mold 13 and the inner mold 14 in the clamped state, and is supplied to the belt molding space 23. The mouth 15 (injection port 16, runner 17) is communicated so that the molding material of the toothed endless belt 1 can be injected and supplied to the belt molding space 23.

The outer mold 13 is formed with a fixed platen side opening 24 corresponding to a side opening portion of the toothed endless belt 1 with respect to the fixed platen 11, and a movable platen side opening 25 facing the movable platen 12. The opening is formed.
The outer mold 13 is formed with an inner flange-like projecting portion 26 at a fixed platen side end portion 13A located in the fixed platen side opening 24 facing the fixed platen 11, so that the outer mold 13 and the inner die 14 are clamped. A narrow path 27 having a slight length (a length enough to tear the narrowed material portion 28 as described later) can be formed.
The thickness D1 in the radial direction of the constriction path 27 is a thin-walled constriction due to the molding material remaining in the portion of the constriction path 27 when the inner mold 14 is separated from the stationary platen 11 together with the outer mold 13 after injection molding of the molding material. The material portion 28 needs to be thin enough to be separated from the runner residual material 29 by being torn off from the molding material (runner residual material 29) remaining in the runner 17 portion. In practice, the radial thickness D1 of the constriction path 27 can be made substantially equal to the width of the runner 17.
Further, with respect to the runner 17 and the belt molding space 23 with which the narrow path 27 communicates, the radial direction from the inner wall surface of the inward flange-shaped protrusion 26 facing the belt molding space 23 in the outer mold 13 to the maximum circumferential edge of the runner 17 As the length D2, after the molding material is injection-molded as described above, when the inner mold 14 is separated from the stationary platen 11 together with the outer mold 13, the runner residual material 29 in the runner 17 portion having only the radial length D2 is The length needs to be a resistance so that the constriction material portion 28 in the constriction path 27 is torn off.

Further, in the outer mold 13, a flange portion forming recess 30 is formed in an annular shape at the movable platen side end 13 B facing the movable plate 12, and the flange portion forming recess 30 can communicate with the belt molding space 23. It is said.
That is, for the belt molded body 1A of the toothed endless belt 1 to be molded in the belt molding space 23, the flange portion forming recess 30 capable of forming the circumferential flange portion 31 at the belt end portion located on the movable platen 12 side. The movable mold side end portion 13B of the outer mold 13 can be formed so as to communicate with the belt molding space 23.
The flange-forming recess 30 has a radial length D3 when the inner mold 14 is separated from the outer mold 13 after injection molding of the molding material. The circumferential flange portion 31 formed in the 30 portion serves as a resistance, and it is necessary that the belt molded body 1A of the molded endless belt 1 remains on the inner peripheral side of the outer mold 13.

The inner mold 14 is formed with the engaging tooth molding groove 9 (FIG. 10) on the outer peripheral surface thereof, and the reinforcing fiber 4 of the toothed endless belt 1 can be wound in the circumferential direction. Yes.
Further, as described above, the narrow path 27 communicating with the belt molding space 23 can be formed between the outer mold 13 and the inner mold 14 facing the supply port 15 of the fixed platen 11.
Further, the inner mold 14 includes a fixed platen side shaft portion 32 that engages and disengages with the fixed plate engaging recess 18 of the fixed platen 11 and a movable platen side that engages and disengages with the movable plate engaging recess 22 of the movable platen 12 (intermediate platen 20). And a shaft portion 33.

A method for manufacturing (injection molding) the toothed endless belt 1 by the manufacturing apparatus 10 for the toothed endless belt 1 having such a configuration will be described below with reference to FIGS.
As described above with reference to FIGS. 1 and 2, the mold open state of the manufacturing apparatus 10 for the toothed endless belt 1 is a state in which the outer mold 13 is separated from the fixed platen 11 by the movable platen 12.
The inner mold 14 to which the release agent is applied and the reinforcing fiber 4 is wound is disposed between the fixed platen 11 and the outer mold 13, and the movable platen 12 is moved in the direction of the fixed platen 11 (right direction in FIG. 1). Thus, the fixed plate side shaft portion 32 of the inner mold 14 is set to the fixed plate engaging recess portion 18 of the fixed plate 11, and the movable plate side shaft portion 33 of the inner die 14 is set to the movable plate engaging recess portion of the movable plate 12 (intermediate plate 20). Each is engaged with 22 and clamped as shown in FIG.

    In such a mold-clamped state, a molding material (generally, a thermoplastic elastomer) is injected and supplied at a predetermined pressure from the injection port 16 of the supply port 15, and the inner mold 14 and While being injected and supplied to the belt molding space 23 between the outer dies 13, the pressure is maintained and cooled in this state (FIG. 2).

FIG. 3 is a schematic sectional side view showing a state (first mold opening state) in which the movable mold 12 separates the outer mold 13, the inner mold 14, and the belt molding 1 </ b> A of the toothed endless belt 1 from the stationary platen 11. .
In this first mold open state, the fixed platen side shaft portion 32 of the inner die 14 is detached from the fixed plate engaging recess 18 of the fixed platen 11, and the molding material (runner residual material 29) in the runner 17 portion is fixed platen. 11, the narrowed material portion 28 in the narrowed path 27 between the outer mold 13 and the inner mold 14 is torn off and separated, and the belt molded body 1 </ b> A is formed into a necessary and appropriate shape in the belt molding space 23. Remains.

FIG. 4 shows a state in which the movable platen side shaft portion 33 of the inner mold 14 is pushed out toward the fixed platen 11 by the pushing pin 21 in the movable platen 12 and the inner die 14 is cut from the outer die 13 by about half the length (first). It is a schematic sectional side view which shows the mold open state of 2).
In the mold opening operation to the second mold opening state, the movable portion 19 and the intermediate plate 20 are stopped at that position, and only the push pin 21 pushes the inner die 14 toward the fixed plate 11 with a predetermined push force. The belt molded body 1A of the endless belt 1 with teeth and the reinforcing fibers 4 are mechanically and precisely moved in the axial direction and are molded so as to be positioned on the outer periphery of the inner mold 14 in the second mold open state. 13 can remain on the inner peripheral side.
Further, in the pushing operation of the inner die 14 by the pushing pin 21, the flange portion of the outer die 13 is provided at the belt end of the belt molded body 1 </ b> A of the toothed endless belt 1 in the belt molding space 23 on the movable platen 12 side. Since the circumferential flange portion 31 is integrally formed by the forming recess 30, the circumferential flange portion 31 becomes a resistance, and the entire belt molded body 1 </ b> A of the toothed endless belt 1 is directed toward the fixed platen 11 of the inner mold 14. There is no risk of being pulled out of the outer mold 13 by being dragged by the mold opening operation.
Further, the extrusion amount of the inner die 14 by the extrusion pin 21 may be such that approximately half the length of the inner die 14 is separated from the outer die 13 and the entire inner die 14 does not fall due to its own weight. , And separated from the outer mold 13.

FIG. 5 is a schematic cross-sectional side view showing a state (third mold opening state) in which the inner mold 14 whose mold has been opened by about half the length is manually pulled out from the outer mold 13 manually.
The mold opening operation to the third mold opening state can be executed manually because the inner mold 14 is pulled out from the outer mold 13 by almost half of the length, so that the third mold opening can be performed manually. In the state, the inner mold 14 is removed after the belt molded body 1A of the toothed endless belt 1 and the reinforcing fibers 4 are transferred to the outer mold 13 side.

FIG. 6 is a schematic sectional side view showing a state (fourth mold opening state) in which the movable platen 12 (intermediate platen 20) is separated from the outer die 13 while the inner die 14 is removed from the outer die 13. As shown in FIG.
In the fourth mold open state, the movable platen side opening 13B of the outer die 13 facing the movable platen 12 faces the movable platen 12 side of the belt molded body 1A of the endless belt 1 with teeth. The facing end is exposed in an open state.

FIG. 7 is a schematic cross-sectional side view showing an operation of manually taking out the belt molded body 1A of the molded toothed endless belt 1 from the outer mold 13.
The belt molded body 1A of the toothed endless belt 1 molded and cooled can be elastically deformed even if the circumferential flange portion 31 is integrally formed at the belt end, and the outer mold 13 and Since a necessary space can be made between the intermediate plate 20 and the intermediate plate 20, it can be easily removed from the outer mold 13 in the direction of the movable plate 12 by hand. That is, it is not necessary to take out the belt molded body 1A by forcibly bending or distorting it, and the belt molded body 1A can be taken out in a substantially molded shape, so there is no fear of breakage or deformation.

FIG. 8 is a schematic cross-sectional side view of the belt molded body 1 </ b> A of the toothed endless belt 1 taken out from the outer mold 13.
The fixed platen side unnecessary end portion 1B (including the torn narrowing material portion 28) on the fixed platen 11 side of the belt molded body 1A of the toothed endless belt 1 is cut and removed at the fixed platen side cutting line 34 and the movable platen 12 side is removed. By cutting and removing the movable platen-side unnecessary end portion 1C at the movable platen-side cutting line 35, the endless belt 1 with teeth as the final product can be obtained.

    Thus, according to the present invention, the narrow path 27 communicating with the belt molding space 23 is formed between the outer mold 13 and the inner mold 14 facing the supply port 15 of the fixed platen 11, A flange portion forming recess 30 is formed in the mold 13 so as to communicate with the belt molding space 23, and the molding material can be injected and supplied to the belt molding space 23 from the supply port 15 through the narrow path 27. Thus, the injection molding method can shorten the molding time, and can automate the processing and save labor.

    Further, since the endless belt 1 with teeth formed in the belt forming space 23 is formed with a circumferential flange portion 31 corresponding to the flange forming recess 30 at the belt end located on the movable platen 12 side. The belt molded body 1A of the toothed endless belt 11 to be left on the outer mold 13 and the inner mold 14 can be reliably separated. The inner mold 14 is removed from the outer mold 13 by the movable platen 12, and the outer mold 13 is removed. 1A of the toothed endless belt 1 molded on the inner peripheral side of the belt can be left without being damaged.

    Furthermore, the toothed endless belt 1 can be manufactured in a short time and at a low cost by separating the movable platen 12 from the outer mold 13 and taking out the molded molded body 1A of the toothed endless belt 1 from the outer mold 13. it can.

1 Toothed endless belt (Figs. 8 and 9)
1A Belt molded body of endless belt 1 with teeth (FIGS. 2 and 8)
1B Unnecessary end of fixed end side of toothed endless belt 1 (FIG. 8)
1C Unnecessary end of movable end side of toothed endless belt 1 (FIG. 8)
2 Toothed endless belt manufacturing equipment (Fig. 10)
DESCRIPTION OF SYMBOLS 3 Belt main body 4 Reinforcing fiber 5 Engagement tooth 6 Outer mold 7 Inner mold 8 Belt molding space 9 Engagement tooth molding groove 10 Manufacturing apparatus of toothed endless belt 1 (Example, FIGS. 1 to 7)
DESCRIPTION OF SYMBOLS 11 Fixed platen 12 Movable platen 13 External mold | type 13A Fixed platen side edge part 13B of the outer mold | type 13 Movable platen side edge part 14 of the outer mold | type 13 Inner type | mold 15 Supply port 16 Injection port 17 Runner 18 Fixed platen engagement recessed part in the fixed platen 11 DESCRIPTION OF SYMBOLS 19 Movable part 20 Intermediate | middle board 21 Extrusion pin 22 Movable board engaging recessed part 23 in the movable board 12 (intermediate board 20) Belt forming space 24 Fixed board side opening 25 of outer mold 13 Moving board side opening 26 of outer mold Inner flange-shaped protrusion 27 of outer mold 13 Narrow path 28 Narrow material 29 in narrow path 27 Runner residual material 30 in runner 17 Flange forming recess 31 formed in outer mold 13 Belt molded body of toothed endless belt 1 Circumferential flange portion 32 formed on 1A Fixed platen side shaft portion 33 of inner die 14 Movable platen side shaft portion 34 of inner die 14 Fixed platen side cutting line (FIG. 8)
35 Movable panel side cutting line (Fig. 8)
D1 Radial thickness of constriction path 27 (FIG. 2)
D2 The radial length (of the runner residual material 29 in the runner 17) from the inner wall surface of the inward flange-shaped protrusion 26 to the maximum circumferential edge of the runner 17 (FIG. 2)
D3 Radial length of flange portion forming recess 30 (circumferential flange portion 31) (FIG. 1)

Claims (9)

An outer mold and an inner mold arranged concentrically;
A stationary platen having a supply port for supplying a molding material of an endless belt to a belt molding space formed between the outer mold and the inner mold;
An endless belt manufacturing apparatus having a movable plate that moves forward and backward with respect to the fixed plate,
A narrow path communicating with the belt molding space can be formed between the outer mold and the inner mold facing the supply port of the fixed platen,
About the belt molded body of the endless belt to be molded in the belt molding space, a flange forming recess capable of forming a circumferential flange at the end of the belt located on the movable platen side is provided with the belt molding space. The outer mold can be formed so as to communicate with the
The movable plate is equipped with an extrusion pin that allows the outer die and the inner die to advance and retreat with respect to the fixed plate, and allows the inner die to be released from the outer die toward the fixed plate. And
An apparatus for manufacturing an endless belt, wherein the movable mold allows the inner mold to be removed from the outer mold. 2. The endless belt according to claim 1, wherein the belt-molded body of the endless belt molded on the inner peripheral side of the outer mold can remain in a state where the inner mold is removed from the outer mold. Manufacturing equipment. The endless belt manufacturing apparatus according to claim 1 or 2 , wherein the movable plate is separable from the outer mold in a state where the inner mold is removed from the outer mold. The outer mold is formed with an inward flange-like projecting portion capable of forming the narrow path at the fixed platen side end facing the fixed platen, and at the movable platen side end facing the movable platen, The endless belt manufacturing apparatus according to any one of claims 1 to 3, wherein a flange forming recess is formed. The outer mold has a fixed platen side opening corresponding to a side opening portion of the endless belt with respect to the fixed platen, and a movable platen side opening facing the movable platen. An apparatus for manufacturing an endless belt according to any one of claims 1 to 4 . The endless belt manufacturing apparatus according to any one of claims 1 to 5 , wherein the movable plate has an intermediate plate for attaching and detaching the outer mold to and from the movable plate. The inner mold includes a fixed platen side shaft portion that engages and disengages with a fixed plate engaging concave portion of the fixed platen, and a movable platen side shaft portion that engages and disengages with the movable plate engaging concave portion of the movable platen. An apparatus for manufacturing an endless belt according to any one of claims 1 to 6 . The endless belt manufacturing apparatus according to any one of claims 1 to 7 , wherein a reinforcing fiber of the endless belt can be wound around the inner mold in a circumferential direction thereof. An outer mold and an inner mold arranged concentrically;
A stationary platen having a supply port for supplying a molding material of an endless belt to a belt molding space formed between the outer mold and the inner mold;
A movable plate that moves forward and backward with respect to the fixed plate, and a method of manufacturing an endless belt,
Forming a constricted path communicating with the belt molding space between the outer mold and the inner mold facing the supply port of the stationary platen;
Forming a flange forming recess on the movable plate side of the outer mold to communicate with the belt forming space;
Injecting and supplying the molding material from the supply port to the belt molding space through the narrow path,
For a belt molded body of the endless belt to be molded in the belt molding space, a circumferential flange portion corresponding to the flange portion forming recess is formed at the belt end portion located on the movable platen side,
The inner mold is removed from the outer mold by an extruding pin that allows the inner mold of the movable plate to be removed from the outer mold toward the fixed plate, and the molding material is narrowed in the narrow path. The material part is separated and the belt molded body of the endless belt molded on the inner peripheral side of the outer mold integrally with the circumferential flange part is left,
Further, separating the movable plate from the outer mold,
A method for producing an endless belt, comprising: taking out the molded molded body of the endless belt from the outer mold toward the movable platen .

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