JPH0634915U - Die-cutting device for cylindrical molded products - Google Patents

Abstract

(57) [Summary] [Purpose] It is not necessary to provide a part that causes material loss in the molded product, and there is no risk of quality defects such as internal strain, and the molded product is reliably extracted from the mold. [Structure] A plurality of friction plates 10 are arranged so as to be pressed against the outer periphery of a cylindrical molded product A attached to the side surface of a cylindrical mold B. The friction plate drive means 20 is configured to press the friction plate 10 against the outer periphery of the molded product A with a constant force and to lock the friction plate 10 in that state. A moving means 30 is provided, which provides relative movement of the molded product A in the axial direction between the mold B and the friction plate 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a die-cutting tool for extracting a cylindrical molded product (for example, a rubber molded product called a slab, which has not been cut into a plurality of transmission belts) formed on its side surface from a columnar mold. It relates to the device.

[0002]

[Prior art]

 A slab, which is a semi-finished product for manufacturing a power transmission belt, is molded and vulcanized on the side surface of a cylindrical mold (inner mold), but it is not so easy to remove the slab from the mold. It is sufficient to move the slab relative to the mold in the axial direction (or move the mold in reverse), but since the slab contracts on the mold during cooling, considerable force is required. .

In order to effectively apply the force necessary for the relative movement to the slab, an adapter G that engages with a part of the slab E is conventionally used as shown in FIG. If this adapter G having several grooves Ga on the outer circumference is connected to the shaft end of the mold F and the slab E is integrally molded (and vulcanized) on the side surfaces of both molds, the slab E Engages with the adapter G at the groove G a. Therefore, for example, as shown in FIG. 4, when the adapter G is fixed and the upper protrusion Fa of the mold F is pushed down by the push rod H, the mold F is separated from the slab E and pulled out. To separate the main body of the slab E from the adapter G, subsequently separate the main body of the slab E at the position of the lower end surface of the adapter G (the part attached to the outer circumference of the adapter G is also cut vertically). Done. The use of such an adapter is described in JP-A No. 2-188219.

In addition to using the adapter as described above, as a means for pulling out a slab or other tubular molded product from a columnar mold, a method of hooking a claw on the axial end of the molded product on the mold There is also. After fixing the mold, extend several claws from the surroundings according to the size of the mold and hang it on the shaft end of the molded product, and move the molded product with that claw (or conversely, hook the claw to mold the product By fixing the and moving the mold), the molded product is pulled out from the mold.

[0005]

[Problems to be solved by the device]

 Among the conventional die-cutting means introduced above, the one using the adapter as shown in FIG. 4 has a drawback that a loss of molding material is inevitably caused in the adapter part. In other words, the part molded on the side surface of the adapter has no use after the molded product is separated from the mold, and is separated from the molded product body and becomes scrap. In addition, if the frictional force between the molded product and the mold is large, a large tension is applied to the intermediate part that straddles the mold and the adapter, causing the molded product to break or the molded product to There is also the inconvenience that distortion easily occurs.

On the other hand, in the method in which the claw is hooked on the end of the molded product in the axial direction, the claw often does not hang on the molded product in an appropriate state. Unlike the middle part, the part near the shaft end of the molded product may have uneven thickness or may not have sufficient strength. Since it is difficult to extend it to a proper position (a position that is close enough to the side surface of the mold only if it hits the side surface of the mold), the tip of the nail is likely to come off from the shaft end of the molded product. However, if you touch the tip of the nail to the side of the mold so that the nail does not come off from the molded product, the mold or nail will be easily damaged. In addition, in such a method using a claw, the force for relative movement of the mold / molded product is locally concentrated at the shaft end of the molded product and at the part where each claw touches. There is a high possibility that internal distortion (or disturbance of built-in reinforcing fibers, etc.) will occur in the molded product centering around.

An object of the present invention is that it is not necessary to provide a part that causes material loss in a molded product, and there is no risk of causing a quality defect of the molded product such as internal strain, so that the molded product can be reliably removed from the mold. It is to provide a device that can be extracted.

[0008]

[Means for Solving the Problems]

 The die-cutting device for a tubular molded product according to the present invention includes a plurality of friction plates arranged to be pressed against the outer periphery of the molded product, and the friction plates pressed against the outer periphery of the molded product with a constant force. The friction plate driving means for locking with, the moving means for providing relative movement of the molded product in the axial direction are provided between the die and the friction plate. As the friction plate, use a plate with a high coefficient of friction with the molded product, such as a plate with a rough surface.

Further, as in claim 2, a part or all of the plurality of friction plates are arranged so as to push only the middle of the outer periphery of the molded product in the axial direction, and Further, it is also possible to form a claw that hangs on the shaft end of the molded product.

[0010]

[Action]

 In the die-cutting device of the present invention, the above friction plate is pressed against the cylindrical molded product on the side surface of the columnar mold by the driving means, and the relative movement between the mold and the friction plate is made by the moving means. By raising it, the molded product is removed while moving to the mold together with the friction plate. It is between the die and the friction plate that gives relative movement, but since the friction force between the friction plate and the molded product exceeds that between the die and the molded product, the mold and the molded product are The molded product is pulled out by slipping between the gap and. If the number of friction plates is increased and they are made longer in the axial direction (axial direction of the molded product) to increase the contact area with the molded product, sufficient friction force will be obtained to ensure the above extraction. Is generated between the product and the molded product, and the concentration of force that adversely affects the molded product is not caused.

The friction plate driving means presses the friction plate with an appropriate force against the molded product on the mold and locks in that state (that is, there is no further displacement in the pressing direction). Therefore, when a molded product is pulled out of the mold, there is no fear that the molded product will be forcibly bent by the force of the friction plate or that the friction plate will be applied to damage the mold.

In the die-cutting device of the second aspect, in addition to the above-mentioned friction plate, a claw similar to the one introduced previously as the conventional technique is used together. That is, when a sufficient number and area of friction plates cannot be provided, or when the pressing force of the friction plates is insufficient, the above-mentioned action of the friction plates is supplemented by the claws on the shaft end of the molded product. The molded product will move relative to the mold based on the frictional force received from the friction plate on its side surface and the force received from the pawl at the shaft end.

However, the claw is formed integrally with the friction plate, and the tip can be placed very close to the side surface of the mold so as not to come off from the shaft end of the molded product. Different from the nails. The friction plate with pawls is arranged so as to push only the middle (axial direction) part of the outer periphery of the molded product that has a uniform thickness and is easy to form in a prescribed manner. Since it extends inward by an appropriate length according to the thickness of the molded product, the position of the tip of the pawl is naturally accurately determined when the friction plate is pressed against the molded product.

[0014]

【Example】

 1 and 2 show a first embodiment of the present invention. Of these, FIGS. 1 (a) and 1 (b) are schematic views of the main parts of the die-cutting device 1 of this embodiment shown in FIGS. 2 (a), (b), and (c).

This device 1 is provided with a cylindrical mold (inner mold) B and a slab (cylindrical rubber molded product which is a semi-finished product of a rubber belt for transmission) A molded and vulcanized on its side surface. It is a device to pull out. The slab A projects a rubber material between a mold B having a large number of axial grooves (not shown) on its side surface and a cylindrical outer mold (not shown) arranged outside thereof. It is molded by molding and then vulcanized by pressing and heating. The slab A for the toothed belt is molded due to the groove on the side surface of the mold B, but the outer mold is removed after vulcanization (the outer mold is easy because the slab A contracts during cooling). At this stage, the device 1 withdraws the slab A from the mold B.

In outline, the device 1 is configured as shown in FIGS. 1 (a) and 1 (b). That is, the friction plate 10 and its driving means 20, the fixing mechanism 40 for fixing the mold B at the central portion, the elevating mechanism 50 for raising and lowering the friction plate 10 and the driving means 20, and the like are the main parts of the apparatus 1. The friction plate 10 is a metal plate whose surface is knurled (makes mesh-like knurls), but two upper and lower plates are attached to the support plate 13 via a support rod 11 and a spring 12 to form a central portion. As shown in FIG. 1 (b), eight sets are arranged so as to surround the mold B placed on the. As the driving means 20, a push rod 21 connected to the support plate 13 is pushed and pulled by a driving force of a motor 22 described later. The fixing mechanism 40 sandwiches and fixes the mold B by the expansion / contraction end 41a of the reduction cylinder 41 and the pin 42a on the table 42. Further, the elevating mechanism 50 is configured to elevate and lower the frame 36 having the friction plate 10 and the driving means 20 thereof by the action of the feed screw 54. The combination of the fixing mechanism 40 and the elevating mechanism 50 is also the moving means 30 that gives relative movement between the mold B and the friction plate 10.

In this die-cutting device 1, the mold B is fixed by the fixing mechanism 40, each friction plate 10 is pressed against the slab A on the side surface thereof by using the driving means 20, and all the lifting mechanism 50 is used. The slab A is pulled upward from the mold B by raising the frame 36 together with the friction plate 10. When the sizes of the slab A and the mold B are changed, the axial dimension can be responded to by the expansion / contraction amount of the cylinder 41, and the radial dimension can be responded to by the position of the friction plate 10. It can also be applied to mixed production of various sizes.

The detailed configuration of the device 1 is as shown in FIGS. 2 (a), (b), and (c). First, as a skeleton to which the cylinder 41, the table 42, etc. are attached, a column 31 is erected on a base plate 33 to fix an upper plate 32. The frame 36 is moved up and down while sliding along the column 31.

The friction plate driving means 20 is configured such that the servo motor 22 with a brake drives all the friction plates 10 forward and backward toward the position of the mold B, and is constructed entirely within the frame 36. ing. That is, (a) as shown in FIG. 2 (a), the rods 21 for pushing the friction plates 10 are respectively inserted into the bevel gears 28b via screws, and the rods 21 are moved forward and backward by the rotation of the bevel gears 28b. 2) Each bevel gear 28b was meshed with the bevel gear 28a on the vertical shaft 27 provided on the frame 36, and was attached to the output shaft of the motor 22 as shown in FIG. 2C. Pulley 23 was connected to pulleys 26 on each shaft 27 via synchro belts 24 and 25. Therefore, when the motor 22 is activated, the eight shafts 27 rotate at the same time, and the rotation is replaced by the forward / backward movement of the rod 21 via the bevel gears 28a and 28b. When the rod 21 is moved forward, the motor 22 stops its rotation when the pressing force of the friction plate 10 against the slab A reaches a proper value (a constant value depending on the type of slab A), and brakes in that state. Is controlled to work.

In the fixing mechanism 40, the table 42 is configured to be movable for the purpose of facilitating the installation and replacement of the mold B. That is, the center shaft 43 rotatably supports the table 42, and the tables 42 are arranged so as to slide along the straight track 44. Since the two pins 42a are provided on the table 42 as shown in FIG. 2B, the mold B can be efficiently installed and replaced by rotating the table 42 and sliding the table 42 back and forth.

As the elevating mechanism 50, four vertical feed screws 54 are passed through the female thread portion 55 of the frame 36, and the motor 51, which is a driving portion of each screw 54, and the gear box 52 / bevel gear pair. 53 and the like are arranged on the upper plate 32.

The apparatus 1 is also provided with a receiving means 60 for the slab A extracted from the mold B. As shown in FIG. 2 (a), the same means 60 comprises a box 61 whose upper and side parts are partially opened, a plurality of rollers 62 provided on a bracket 61a of the box 61, and a groove into which the rollers 62 fit. The guide frame 63 and the air cylinder 64 for moving the box 61 back and forth. The box 61 easily receives the slab A from above in the state shown by the solid line in the figure, but when the slab A is dropped onto the box 61, the cylinder 62 is contracted so that the roller 62 moves along the guide frame 63. As a result, the box 61 moves up while moving up to an outer position where a worker can easily carry the slab A.

With the die-cutting device 1 configured as described above, the slab A can be pulled out from the die B by the following procedure.

1) A worker puts the mold B with the slab A attached to the side surface on the pin 42 a of the table 42. Of the two pins 42a, the pin 42a at the outer position where the mold B can be easily placed may be used.

2) Press the operation switch (not shown) of the device 1. As a result, the subsequent steps will proceed automatically.

3) The table 42 turns and moves forward, and the mold B is carried to directly below the cylinder 41 (central portion).

4) The cylinder 41 of the fixing mechanism 40 extends, and the mold B is fixed by pressing the upper end of the mold B with the expandable end 41a.

5) The frame 36 located above is lowered by the lifting mechanism 50.

6) The friction plate 10 which has retracted outward is pressed onto the slab A by the driving means 20. At this time, as described above, the drive means 20 is locked when the pressing force reaches the set value.

7) The slab A is extracted from the mold B by raising the frame 36 by the elevating mechanism 50. Since the operation of the friction plate 10 is locked, the extracted slab A is held between them without being excessively bent by the friction plate 10.

8) The cylinder 41 of the fixing mechanism 40 contracts, and the expandable end 41a moves away from the mold B and rises.

9) The table 42 retreats and turns to carry the mold B separated from the slab A to a position where the operator can easily take it out.

10) The cylinder 64 of the receiving means 60 advances the box 61 retracted to the outside. The box 61 enters directly below the slab A held between the friction plates 10 and tilts so that the slab A can be easily received.

11) The driving means 20 retracts the friction plate 10 to drop the slab A into the box 61.

12) The cylinder 64 of the receiving means 60 contracts and retracts the box 61 to the original position, so that the received slab A is carried to a position where it can be easily taken out.

Next, FIGS. 3 (a), (b), and (c) show a second embodiment of the present invention. The die-cutting device 2 shown in the figure also pulls out a slab C, which is a cylindrical molded product that is molded and vulcanized on its side surface, from a cylindrical mold D.

This device 2 also has a friction plate 110 to be pressed against the slab C on the die D and a driving means 120 thereof, but differs from the die cutting device 1 of the first embodiment in the following points. It That is, a) The friction plate 110 is constructed by attaching a rubber 112 having high friction to the inner surface of the metal plate 111. The position where the rubber 112 is attached is near the shaft end of the slab C (the shaft ends on both sides are often not molded to the specified thickness as shown in the figure, and the cord for reinforcing the belt Etc. are not built in. Note that this part is the part corresponding to the middle except (excised later). As shown in FIG. 3B, the friction plate 110 surrounds the slab C and the mold D so that it can be moved forward and backward on the guide rail 125, which will be described later, but is not vertically moved (elevated). It was installed in the place.

B) The friction plate driving means 120 pushes and pulls the friction plate 110 (metal plate 111) by the air cylinder 121 attached to the bracket 123 on the floor surface. The friction plate 110 moves forward and backward along a guide rail 125 fixed on the floor through a slide block 124a that is integral with the lower bracket 124 and without floating from the rail 125. The body of the cylinder 121 is equipped with a lock tool 122 so that the rod 121a of the cylinder 121 will not be displaced further when the friction plate 110 is pressed against the slab C on the die D with a predetermined force. Like the cylinder 121, the lock 122 is actuated by air and receives the pressure of the air to lock (braking) the rod 121a, and plays a role similar to a brake.

C) While the friction plate 110 and its driving means 120 do not move in the axial direction of the slab C (that is, up and down) as described above, the die D is lifted upward by a hanging tool (not shown). This was used as a moving means between the mold D and the friction plate 110.

D) When the friction plate 110 is pressed against the slab C at the upper end portion of each friction plate 110 (that is, the end portion in the relative movement direction of the mold D with respect to the friction plate 110), as shown in FIG. The claw 116 was attached so as to be located on the upper end of the cage slab C. The amount of projection of the claw 116 inward is determined when the friction plate 110 is pressed against the slab C (middle part) on the mold D with an appropriate force (and when locked as in b) above). In addition, it is assumed that the tip does not come into contact with the side surface of the mold D but is located extremely close to it.

In the die-cutting device 2, when the die D having the molded and vulcanized slab C on its side surface is placed in the center, the cylinder 121 is extended to press the friction plate 110 onto the slab C. (And locked in that state), and then the mold D is lifted to separate the slab C and the mold D. Since the number of friction plates 110 and the contact area with the slab C are slightly insufficient, there is a possibility that the slab C will slip on the friction plates 110, but when slippage occurs, a claw 116 is provided on the upper end of the slab C. Since it is caught, it does not hinder the die cutting. The fact that the tip of the claw 116 comes to a position extremely close to the side surface of the mold D is one of the factors that enable reliable mold release. It should be noted that a slab C that is to be die-cut is preferably highly rigid (for example, has relatively high thickness and hardness, and is short), because it can effectively receive force from the claws 116.

Although two embodiments have been introduced above, in addition to these, the die-cutting device of the present invention can also be implemented as follows, for example.

(A) Of course, it does not matter if the object is a tubular molded product other than the rubber belt or the semi-finished product slab, or a molded product that is not cylindrical but has, for example, a rectangular tubular shape.

(B) The number of friction plates and their driving means is set according to the sizes of the molded product and the mold, and when a large size is targeted, a large number of friction plates may be arranged.

(C) The area of the friction plate is determined in the same manner as in (b) above, but the contact surface with the molded product may be a flat surface or a curved surface corresponding to the shape of the molded product.

[0046]

[Effect of device]

 The die-cutting device of the present invention has the following effects.

1) Since it is not necessary to provide a part that causes material loss in the molded product, the yield in the molded product production is improved.

2) Unreasonable force is not concentrated on the molded product, so there is no risk of causing quality defects of the molded product such as internal strain.

3) The molded product can be reliably extracted from the mold, and the molded product and the mold are not damaged by the friction plate immediately after extraction.

In addition to the above, the die-cutting device of claim 2 has the following effect.

4) Since the action of the friction plates is supplemented by the claws, it is possible to reliably perform die cutting even when the number, size, and pressing force of the friction plates cannot be sufficiently taken due to the installation space and the like.

[Brief description of drawings]

FIG. 1 is a schematic view of a die-cutting device 1 according to a first embodiment of the present invention, FIG. 1 (a) is a front view of a main part, and FIG. 1 (b) is a plan view thereof.

FIG. 2 is an overall view of the above-mentioned die cutting device 1, FIG. 2 (a) is a front view, FIG. 2 (b) is a side view, and FIG. 2 (c) is c- in FIG. 2 (a).
It is c sectional drawing.

FIG. 3 relates to a die-cutting device 2 of a second embodiment of the present invention, FIG. 3 (a) is a front view, FIG. 3 (b) is a plan view, and FIG. It is a detailed view of the vicinity of the nail in the state of being pressed against the product.

FIG. 4 is a front view of a conventional die cutting means.

[Explanation of symbols]

 1.2 Die-cutting device 10/110 Friction plate 20/120 Friction plate driving means 30 Moving means 116 Claw A / C Molded product (slab) BD Mold

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[Procedure amendment]

[Submission date] October 16, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 29, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 4]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (2)

[Scope of utility model registration request] 1. A device for ejecting a cylindrical molded product formed on a side surface of a columnar mold, wherein a plurality of friction plates arranged to be pressed against the outer periphery of the molded product, and the molded product. A friction plate driving means for pressing the friction plate against the outer periphery with a constant force and locking in that state, and a moving means for providing relative movement in the axial direction of the molded product between the mold and the friction plate. A die-cutting device for a cylindrical molded product. 2. A part or all of the plurality of friction plates are arranged so as to push only the middle of the outer periphery of the molded product in the axial direction, and have a claw that hangs on the axial end of the molded product. The die-cutting device for a tubular molded article according to claim 1.