JP2733883B2 - Injection molded product removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an injection molded product when manufacturing a disk cartridge, and more particularly to a method for removing an extremely thin injection molded product such as a plastic shutter mounted on a micro floppy disk.

[0002]

2. Description of the Related Art Disk-shaped recording media such as a magnetic disk and an optical disk are loaded into a recording / reproducing apparatus while being stored in a cartridge case to record desired information for easy handling and protection from dust. For example, a 3.5-inch micro floppy disk is known which can be reproduced.

[0003] The micro floppy disk has a magnetic disk rotatably housed in thin rectangular upper and lower half shells formed of ABS resin or the like. In order to prevent dust and the like from entering into the micro floppy disk through the magnetic head insertion opening and sticking to the magnetic disk, the sliding shutter opens and closes the magnetic head insertion opening. Is installed.

[0004] Then, the shutter is formed by bending a metal plate of for example a thin stainless steel in a U-shape, the front plate, after
It consists of a face plate and a connecting plate connecting these, and a projection protruding near the connecting portion of the shutter is guided in a guide groove provided along a side edge of a front outer surface of the upper and lower half shells, and magnetically. It is slidably mounted in the direction to open and close the head insertion opening. That is, the shutter slides in a sliding area formed in a region including a peripheral edge of the magnetic head insertion opening and extending over one side surface of the microfloppy disk. The shutter has an opening that matches the magnetic head insertion opening in the use state and exposes the magnetic disk to the outside. In the non-use state, the magnetic head insertion opening is formed by the shutter. The magnetic disk is closed with a shutter, and the magnetic disk is covered with the shutter.

In recent years, shutters integrally formed using a synthetic resin material have been proposed as the shutters. These shutters have been used for conventional metal shutters which have many manufacturing steps and are difficult to perform with high precision. Instead, it has the advantage of being easy and inexpensive to manufacture.

[0006]

When a shutter is formed from a synthetic resin, a material having self-lubricating properties, such as polyacetal, is usually used with emphasis on the function as a product. However, in these crystalline plastics,
Mold temperature high enough for crystal growth (usually 70-
(Approximately 90 ° C.), and the temperature of the molded product when it is removed from the mold also reaches approximately 80 to 100 ° C., so that the molded product is easily deformed by a slight external force. For this reason, removal of the molded product requires extremely careful attention and is difficult.

An example of a method for removing a molded product according to the prior art is shown in FIGS. 4 and 5 by an injection molded product (shutter).
And the relationship of the take-out unit. The figure
In FIG. 4 , for simplicity of the drawing, for the four shutters 1 formed in a horizontal posture, only the take-out unit 3 having a structure for holding one shutter is shown, and the portions corresponding to the other shutters are omitted. Of course, the take-out unit has a structure of four take-outs corresponding to the number of shutters.

In each figure, one conventional extraction method is performed according to the following operation process of an extraction unit. First, the movable mold 2 is moved and removed, and the take-out unit 3 enters the movable mold 2 and the fixed mold 2a in the opened state from above in the vertical direction (the direction of arrow A).

After the take-out unit 3 enters the two dies, it moves forward (in the direction of arrow B) toward the molded product (shutter 1). The unloading unit 3 includes a pair of upper and lower chucked surfaces a and b of the shutter 1 which are protruded from the movable mold 2 by the protruding pins 4 (see FIG. 5 ) and move in the chucking direction (arrow C direction). Is gripped by the chuck piece 5.

In this state, the take-out unit 3 retreats from the mold 2 (in the direction of arrow D), and pulls out the shutter 1 from the mold 2. Next, the take-out unit 3
Retreats upward (in the direction of arrow E) in the vertical direction, takes out the shutter 1 from the molding area, and conveys it to the next processing step.

However, in the above-described conventional method, the take-out unit operates as described above, that is, the chuck surface of the take-out unit 3 is in a direction perpendicular to the chucked surfaces a and b of the shutter 1. There are the following drawbacks as they enter from the Since the chuck piece 5 is advanced toward the mold 2 after the entry into the mold is completed, and the shutter 1 is removed from the mold 2, the removal time of the shutter 1 is increased. It costs.

There are movements such as entry and stop of the take-out unit 3 into the fixed and movable molds, and further advance and stop with respect to the shutter, and the unit entry direction is perpendicular to the holding direction of the chuck piece 5. Because of this, the vibration generated at the time of stopping the approach affects the accuracy of the sandwiching position in the shutter thickness direction when the shutter 1 is held, and the shutter is easily deformed when sandwiched. The effect of this vibration increases as the operation of the unit 3 increases,
This has been a major bottleneck in improving productivity.

In addition to the above reasons, there is an inconvenience that the protruding pin 4 comes into contact with the take-out unit 3 due to a shift in operation timing or the like, and the protruding pin 4 is easily broken.

Further, in addition to the above-mentioned problems in the form of forming the shutter, the following problems which occur when the shutter is taken out are added. That is, the above-mentioned plastic shutter is required to have strict dimensional accuracy particularly in the thickness direction, and if the swelling in the thickness direction is too large or too small without satisfying this requirement, the upper and lower half shells. When the cartridge is mounted on a cartridge made of, the cartridge and the cartridge case may be caught or have poor sealing. For this reason, as a problem at the time of taking out, as described above, the crystalline resin material such as polyacetal (POM) used for the shutter material is at a high temperature even at the time of taking out from the mold and is deformed by a slight external force as described above. Easy to occur
In addition, if the set position is slightly deviated between the shutter 1 and the chuck piece 5, there is a high risk of easily causing deformation beyond an allowable limit.

[0015] The present invention is intended to eliminate the disadvantages of the above-described description, shortening the take-out time, preventing the molded product from being deformed at the time of take-out, and preventing breakage of the protruding pin that causes the molded product to protrude from the mold. It is an object of the present invention to provide a method for taking out an injection-molded article, which prevents the injection molding and improves productivity.

[0016]

SUMMARY OF THE INVENTION The above object of the present invention, de
Front plate, rear plate, and these for disk cartridges
A shutter with a U-shaped cross section consisting of a connecting plate
When molding by injection molding, the cavity of the movable mold
Provide a protruding pin inside and connect the connecting plate of the shutter
Perpendicular to the mating surface of the movable mold and the fixed mold
A pair of fingers that protrude and hold the shutter
An injection molded product take-out unit equipped with a
The shutter is used to remove the shutter from the movable mold.
A method for taking out a molded product, wherein the unit comprises:
From outside the moving mold, advance parallel to the mating surface,
The pair of chuck pieces can
The surface moves parallel to the chucked surface of the shutter.
The chucked surface is freely movable in and out, and
And the rear panel, wherein the unit operates the shutter.
Until the operation of moving to the predetermined position to be gripped is completed
At the same time, the protrusion pin causes the shutter to protrude.
Operation is completed, a pair of chuck pieces of the unit,
An elastic part is provided at the part of the shutter that grips the chucked surface.
Material is stuck, and the chuck surface of the elastic member is
Surface contact is made perpendicular to the surface to be chucked.
The chucked surface of the shutter is moved by a pair of chuck pieces.
Grasp and immediately the shutter by the unit
I De extraction method moldings taken out from the movable mold
Is achieved by

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for removing an injection-molded article according to the present invention will be described in detail with reference to FIGS . In addition,
In each figure, the same parts as those in the prior art described in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.
Further, in each embodiment, as in the conventional example, a four-cavity mold structure is shown, but the take-out unit shows only a pair of chuck pieces for simplification of the drawing.

In FIG. 1, a molded product (hereinafter, referred to as a shutter) 1 injection-molded by dies 2 and 2a is arranged in a vertical posture, and chucked surfaces a and b of the shutter 1 are lowered from above. The drawing shows a method of taking out by gripping from both sides with the chuck pieces 5 of the take-out unit 3 (not shown). That is,
The chuck piece 5 has a chuck surface parallel to the chucked surfaces a and b of the shutter 1, and is provided with the molds 2 and 2a.
Wait in the upper position of. When the injection of the resin into the mold space is completed and the movable mold 2 of the pair of molds 2 and 2a moves to open the gap between the molds, the unit 3 is moved to the molds 2 and 2a.
Advance parallel to the mating surface of
The chuck surface of the workpiece 5 is the chucked surface of the shutter 1.
The chuck piece 5 advances parallel to a and b and descends vertically (in the direction of arrow A), enters a predetermined position between the molds 2 and 2a, and stops. The position of the chuck piece 5 at this time is a position where the shutter 1 can be held. On the other hand, substantially in association with this approach operation, the movable mold 2
The protruding pin 4 (see FIG. 2) moves horizontally to cause the shutter 1 to protrude from the parting surface 21 as shown. In this state, the protruding portion of the shutter 1 is arranged between the chuck pieces 5 having a pair structure, and the chucked surfaces a and b of the shutter face the respective chuck surfaces of the chuck pieces 5.

Next, the chuck piece 5 moves in a direction (arrow C direction) where the chuck surfaces approach each other to grip the chuck surfaces a and b of the shutter 1 from both sides. The shutter 1 is pulled out of the mold 2 by moving in the retreating direction (the direction of arrow D). Finally, the chuck piece 5 rises (in the direction of arrow E) and retreats from between the molds 2 and 2a.

In the removal method of the present invention, even if the projecting pin 4 causes the shutter 1 to project before the chuck piece 5 enters the molds 2 and 2a, it is possible to prevent the shutter 1 from colliding with the shutter. The chuck pieces 5 can be opposed to the chuck surfaces a and b, and the chuck piece 5 can be made to enter the mold 2 in a sufficiently close state. The product take-out time can be reduced.

FIG. 2 is a plan view illustrating a specific example of the chuck piece 5 of the take-out unit 3. The take-out unit 3 can be inserted between the molds after the mold 2 shown by the imaginary line is released (the fixed side and the movable side are released) by the support frame 30 having a U-shaped cross section, for example. (In the vertical direction), and is movably provided in the direction away from the parting surface 21 of the mold 2 (arrow D direction) after the shutter 1 is gripped. At the time of descending, it is arranged substantially in contact with the parting surface 21.

The support frame 30 has opposing walls opposing each other.
The chuck members 33 are disposed on the respective 31. The chuck member 33 includes an air cylinder 35 having a pair of piston rods 34 which are attached to the opposed wall 31 so as to face each other and are extendable and contractable in the support body, and a flat plate fixed to the rod tip and facing each other. When the chuck pieces 5 move in the closing direction (the direction of arrow C) approaching each other, they come into soft contact with both sides of the shutter 1 and come into surface contact with each other. The shutter 1 can be gripped.

That is, the chuck piece 5 has a sponge rubber as an elastic member adhered to the contact surface with the shutter 1, and the closest distance between the chuck piece 5 and the opposing piece when the shutter piece is closed is determined by the shutter 1 0.2mm ~
It is set to be smaller by 0.8 mm. Also,
As the sponge rubber, a silicone rubber having a hardness of 15 degrees or less and excellent in heat resistance can be used.

When the shutter 1 is injection-molded and protrudes from the parting surface 21 by the protruding pins 4, the support frame 30 inserted into the mold is removed. The air cylinder 35
Is operated to move the chuck pieces 5 (in the direction of arrow C) to lightly abut on both sides of the shutter 1. Thereby, the position of the shutter 1 is regulated at a predetermined position, and the shutter 1 is held by the chuck piece 5.
Thereafter, while the chuck piece 5 maintains the gripping state,
The support frame 30 moves in the direction away from the parting surface 21 (the direction of arrow D), and the shutter 1 is pulled out of the mold 2. Thereafter, the shutter 1 is lifted up in a direction of withdrawing from the space between the molds (a direction perpendicular to the paper surface) to complete the removal of the shutter 1.

That is, the take-out unit 3 has a chuck surface parallel to the chucked surface of the shutter 1 and is inserted between the dies at a position substantially corresponding to the protruded chucked surface of the shutter 1. Therefore, the surface to be chucked can be immediately grasped immediately after entering the mold, and the time for taking out the shutter 1 can be reduced.

In the case shown in FIG . 3, the shutter 1 is horizontal.
The chucking piece 5 of the unloading unit is formed by being held in the horizontal direction by rotating the chucking piece 5 in the horizontal direction by 90 degrees counterclockwise. The chuck surface 5 grips chucked surfaces a and b, which are both side surfaces of the shutter 1, and the other portions are the same as those described with reference to FIG.

The present invention can achieve the object in each of the embodiments described above, and its operation and effect will be described in further detail. That is, as described in the conventional example shown in FIG. 4 , when the shutter 1 is in a horizontal posture and the chuck surface of the chuck piece 5 of the take-out unit 3 is also provided horizontally, the chuck piece 5 Since the shutter 1 is entered from a direction orthogonal to the longitudinal direction of the shutter 1 to grip the shutter 1, the waiting time until the vibration generated in the chuck piece 5 due to the operation such as the stop of the unloading unit 3 becomes small is long. On the other hand, in each of the embodiments of the present invention, the above-mentioned problem is solved and the take-out time can be reduced. According to experiments, this effect can be obtained by changing the operation method even if the same unloading unit is used.
Compared to the removal time of about 3.1 seconds shown in FIG. 4 for the reasons described above, the removal time was 1.2 seconds according to the method of the present invention shown in FIG. 1.6
Seconds can be greatly reduced.

In a shutter for a 3.5-inch micro floppy disk, the position of the chuck piece has a strict required accuracy in the shutter thickness direction as described above. Here, in the conventional example, the chuck piece 5 of the take-out unit easily deforms the shutter if the position restriction is poor in the thickness direction of the shutter 1, whereas the present invention shown in FIG. According to the embodiment, since the chuck surface of the chuck piece 5 enters and grips along the chucked surfaces a and b of the shutter 1, the operation is stable, and the vibration accompanying the entering operation is reduced. Since adverse effects on the positional accuracy of the chuck surface are effectively avoided,
For example, it can be taken out within the required accuracy within ± 0.1 mm. Further, according to the present invention, since the chuck surface of the chuck piece 5 of the take-out unit 3 enters along the chucked surfaces a and b of the shutter 1, the chuck piece 5 is operated according to the operation timing of the projecting pin 4. The influence of the entry timing of No. 5 can be eliminated.

[0029]

As described above, according to the method for removing an injection-molded product of the present invention, the removal unit has a chuck piece whose chuck piece is parallel to the chucked surface of the molded product,
Further, it is configured to enter the mold from a direction parallel to the chucked surface. Therefore, in the chuck piece of the conventional unloading unit, when the position accuracy of the extremely thin molded article is poor, the molded article is deformed at the time of holding. In this manner, the user enters and grips, so that the operation at the time of gripping is not affected by the vibration accompanying the approaching operation, the operation is stable, and the take-out operation with high positional accuracy of the chuck surface can be performed. Further, according to the present invention, the take- out unit is provided with
The chuck surface of the jack piece is along the chucked surface of the molded product
Since enters so, it is possible to eliminate the influence of the entry timing to that by the operation timing of the projecting pin projecting moldings the chuck pieces can shorten the extraction time of the molded article its motion is simplified.

Further, since the chuck piece according to the present invention grips a molded product in a direction orthogonal to the moving direction when the chuck piece is moved out of the space between the dies, the chuck piece is caused by, for example, vibration generated at the time of stopping and mechanical accuracy. Even if there is a rattling of one piece,
It is possible to avoid deformation of the molded product due to a change in the holding force of the chuck piece.

[Brief description of the drawings]

FIG. 1 is a substantial perspective view showing one embodiment of the present invention when a molded product is set in a vertical direction.

FIG. 2 is a main part plan view showing a specific example of a take-out unit applied to the present invention.

FIG. 3 is a substantial perspective view showing a different embodiment.

FIG. 4 is a diagram illustrating a conventional method for removing a molded product .
It is a body perspective view.

FIG. 5 shows the operation of the shutter and the take-out unit in FIG .
It is a principal part expanded sectional view which shows.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter (molded product) 2, 2a Die 3 Take-out unit 4 Protruding pin 5 Chuck piece 21 Parting surface 30 Support frame 31 Opposing wall 33 Chuck member 34 Piston rod 35 Air cylinder a, b Chuck surface

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-94319 (JP, A) JP-A-63-11317 (JP, A) JP-A-5-44519 (JP, U) JP-A-5-419 41749 (JP, U)

Claims (1)

(57) [Claims] A front plate provided for a disk cartridge;
U-shaped cross-section consisting of rear plates and connecting plates connecting them
Movable when molding shutters by injection molding
Provide a protruding pin in the cavity of the mold and
To the mating surface of the movable mold and the fixed mold.
And project the shutter vertically.
Injection molded product pick-up with a pair of chuck pieces at the tip
The shutter is moved to the movable metal
A method for removing an injection molded product to be removed from a mold, wherein the unit is provided on the mating surface from outside a movable mold.
It is possible to advance and exit in parallel to
The chuck surface of the chuck piece is the chucked surface of the shutter.
It can enter and exit parallel to the surface, and the chucked surfaces are the front plate and the rear plate,
At a predetermined position where the unit grips the shutter
By the time the moving operation is completed,
Thereby, the projecting operation of the shutter is completed, and the pair of chuck pieces of the unit are
An elastic member is attached to the part that grips the chucked surface.
And the chuck surface of the elastic member faces the chucked surface.
To make vertical surface contact, and then the shutter
By gripping the surface to be chucked, immediately by the unit,
Injection molded product to take out the shutter from the movable mold
How to take out.