JPH04164619A - Molding device for upper case for holding audio cassette - Google Patents

Abstract

PURPOSE:To perform molding by releasing an upper case favorably from a mold, by a method wherein the first ejector pin is provided by corresponding to a bottom plate part of the upper case, the second ejector pin is provided by corresponding to a side fringe of the upper case and an elastic means is provided between a movable backing plate and movable mold. CONSTITUTION:A movable template 18 and stationary template 19 are separated from each other as they are confronted with each other by energizing force of a spring 25 under a state where molding is performed and mold break is started, the tip 31 of the first ejector pin 29 is lowered from a confronting surface 20 and the tip 36 of the second ejector pin 30 becomes flush with the confronting surface 20 or lower than the confronting surface 20. When mold breaking is performed further, the movable template 18 and stationary template 19 are separated from each other and a slide core 21 is moved backward. The first ejector rod 39 is operated, the first ejector pin 29 is ejected from the movable template 18, abuts against a bottom plate part 13A of a pocket 13 of an upper case 8 and the place is released from a mold. At the same time, the second ejector pin 30 is ejected the movable template 18, abuts against a rib 15 of the upper case 8 and the position is released from a mold.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for molding an upper case for accommodating an audio cassette, for molding the upper case of a case for accommodating an audio cassette by injection molding or the like.

[Prior Art] Conventionally, as a device of this type, Japanese Patent Application Laid-Open No. 61-291113 discloses a movable mold, a fixed mold that is butted against the movable mold, and a structure formed between the abutting surfaces of the movable mold and the fixed mold. These movable type
A mold for molding an upper case for storing an audio cassette has been proposed, which is provided with a gate for injecting molten resin into a cavity formed by a fixed mold and a sliding core.

Then, the upper case molded by this molding die is integrally connected to the lower case at their base ends via a hinge, and the audio cassette head corresponding portion is loosely fitted into the pocket to store the audio cassette. It looks like this.

[Problems to be Solved by the Invention] In an audio cassette storage case having an upper case molded according to the prior art, the head corresponding part is loosely fitted into the pocket, so that the audio cassette knob is There was a problem in that the side part of the audio cassette was short and perpendicular to the head corresponding part, resulting in poor operability.

Figures 6 and 7 can be used to solve these problems.
Case 1 shown in the figure can be considered.

This case l is an upper case 8 which is integrally connected via holes 6 provided in bases #i4 and 5 of the flat plate parts 2 and 3 and a hinge shaft 7.
and a lower case 9 , and the upper case 8 has a pocket 13 into which the side portion 11 of the audio cassette 10 , that is, the portion orthogonal to the head corresponding portion 12 loosely fits therein.
It is formed at the proximal end 4 of. In addition, 13A is pocket 13
The bottom plate portion 15 is a rib serving as a side edge formed at the longitudinal edge of the flat plate portion 2 of the upper case 8. Therefore, the audio cassette 10 can be easily stored by pinching the relatively long head corresponding part 12 or the opposite side thereof and loosely fitting the side part 11 of the audio cassette 10 into the pocket 13.

However, when molding such a long upper case 8, it is necessary to provide protruding pins corresponding to the pocket 13 and the flat plate portion 2, respectively. That is, in conventional molding equipment, protruding pins for taking out products were provided only in correspondence with the pockets, but in the case of a vertically long case like the upper case 8, protruding pins were provided only in correspondence with the pockets 13. This is because there is a problem with mold releasability if the mold is removed.

An object of the present invention is to improve mold releasability in a molding apparatus for molding an upper case for storing an audio cassette without forming a pocket at the base end in the longitudinal direction for storing the audio cassette.

[Means for Solving the Problems] In order to achieve the above object, the molding device for an upper audio cassette storage case of the present invention includes a movable mold provided on a movable plate, a fixed mold opposite to this movable mold, and Movable type,
In a molding apparatus in which a slide core is provided in a part of the space formed between fixed molds and a protruding pin is provided, a first protruding pin is provided corresponding to a pocket of an upper case, and a first protruding pin is provided corresponding to a pocket of an upper case, A second protruding pin is provided corresponding to the side edge of the part, and an elastic means is interposed between the movable receiving plate and the movable mold.

[Function] In the molding device for the upper case for storing audio cassettes of the present invention, molten resin is injected into the cavity in the mold-clamped state and molding is performed, and then immediately after the mold starts to open, the molding device slides into the cavity by elastic means. The cores move slightly while still in the butt state, and when the mold is opened further, the slide core comes out and the protruding pin of the rear cylinder 1 comes into contact with the pocket of the upper case and protrudes, and the second protruding pin is inserted into the upper case. The upper case can be taken out by touching the edge of the flat plate part and protruding.

[Example 1] Hereinafter, an example of the present invention will be explained in detail with reference to FIGS. 1 to 5.

The mold 16 for molding the upper case 8 shown in FIG. 6 and FIG. The barrel fixed mold plate 19, these movable mold plates 18 and the fixed mold plate 1
Slide core 21 formed between abutting surface 20 with 9
The main components are: Furthermore, a movable mounting plate 23 is provided on the movable receiving plate 17 via a movable spacer 22. A recess 24 is formed on the upper surface of the movable receiving plate 17, and a spring 25, which is an elastic means for constantly urging the movable mold plate 18 upward, is housed in the recess 24. Further, the fixed mold plate 19 is attached to a fixed mounting plate (not shown). An angular pin 26 is inserted diagonally into the slide core 21, and a locking 27 is provided at the rear of the slide core 21.

First and second protruding pins 29 and 30 are provided to release the upper case 8, which is a product formed by the cavity 28 of the mold 16. Said first protruding pin 2
The tips 31 of the movable receiving plate 17 are in contact with both sides of the bottom plate portion 13A of the boget 13 of the upper case 8, respectively.
, while penetrating the movable mold plate 18, the tip 31 is provided flush with the abutting surface 20 in the mold clamping state,
Moreover, the base end 32 has an upper protruding plate 33 and a central protruding plate 34.
and is connected to the lower protruding plate 35. The tip 36 of the second protruding pin 30 is connected to the upper case 8 when the mold is in the clamped state.
The base end 38 of the second protruding pin 30 is connected to the upper protruding plate 33, the central protruding plate 34, and the lower protruding plate 35. . and said first and second protruding pins 29.30.
can be operated via the upper protruding plate 33, the central protruding plate 34, and the lower protruding plate 35 by operating the ejector rod 39. Further, as shown in FIG. 4, a core rod 40 for forming the hole 6 of the upper case 8 is provided on one side of the fixed mold plate 19.

Next, when molding the upper case using the apparatus configured as described above, first, as shown in FIGS. Molten resin P is filled into 28 through a gate (not shown) to perform molding. At this time, the tip 3 of the first protruding pin 29
1 is provided on the same plane as the abutting surface 20, and the tip tl/A 36 of the second protruding pin 30 is provided so as to correspond to the rib 15 of the upper case 8. After molding is performed in this way, the second
As shown in the figure, the movable mold plate 18 and the fixed mold plate 19 are separated from each other due to the biasing force of the suge ring 25 while the movable mold plate 18 and the fixed mold plate 19 are in the butt state, and as a result, the tip of the first protruding pin 29 #A31 descends from the abutting surface 20,
Further, the tip 36 of the second protruding pin 30 is connected to the abutting surface 20.
or descend from the abutting surface 20. Incidentally, when the mold is in the open state, the core rod 40 is drawn out from the cavity 28 in advance.

When the mold is further opened, the movable mold plate 18 and the fixed mold plate 19 are separated as shown in FIGS.
As a result, the slide core 21 moves backward. After the slide core 21 retreats, the first ejector rod 39 operates, and along with this operation, the first protruding pin 29
protrudes from the movable mold plate 18 and the boget 13 of the upper case 8
The mold is released from the mold by contacting the bottom plate portion 13A of the mold. At the same time, the second protruding pin 30 protrudes from the movable mold plate 18 and comes into contact with the rib 15 of the upper case 8 to release the mold from that part.

After taking out the upper case 8, which is a product, in this way, when the mold is to be clamped again, the ejector rod 39 is activated to lower the first projecting pin 29 from the surface of the movable mold plate 18, and the second projecting pin 29 is lowered from the surface of the movable template 18. Move the protruding pin 30 to the movable template 1
Make it flush with the surface of 8 or slightly descend. Next, the slide core 21 is slid to a predetermined position, and then the mold is clamped.

During this mold clamping, the tip 11ij of the first protruding pin 29
31 is flush with the abutting surface 20, and the tip 36 of the second protruding pin 30 corresponds to the rib 15, and is then molded again as shown in FIG.

In this way, by providing the first protruding pin 29 corresponding to the bottom plate portion 13A of the boget 13 of the upper case 8 and providing the second protruding pin 30 corresponding to the rib 15 of the upper case 8, it is possible to When the upper case 8 is released from the mold, both sides of the upper case 8 in the longitudinal direction are protruded, so that the mold release can be performed satisfactorily.

Furthermore, since the second protruding pin 30 is lowered in advance and then protruded after the slide core 21 has retreated,
There is no friction between the slide core 21 and the second protruding pin 30, and good molding can be performed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications are possible, for example, the elastic means may be made of elastic rubber.

[Effects of the Invention] As detailed above, the present invention provides a first protruding pin corresponding to the bottom plate portion of the upper case, a second protruding pin corresponding to the side edge of the upper case, Furthermore, by providing elastic means between the movable receiving plate and the movable mold, the upper case, which is a product, can be released from the movable mold in a good manner and can be molded well.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view showing the mold clamping state, FIG. 2 is a sectional view showing the mold opening starting state, and FIG. 3 is a sectional view showing the mold opening completed state. , Figure 4 is a sectional view around the core rod in the mold clamped state, Figure 5 is a sectional view around the second protruding pin in the mold opening completed state, Figure 6 is an exploded perspective view of the case, and Figure 7 is the upper case. FIG. 2... Flat plate part 4... Base end 13... Pocket 13A... Bottom plate part 15... Rib (l!1 edge) 17... Movable receiving plate 18... Movable receiving plate (movable mold) 19...Fixed mold plate (fixed mold) 20...Abutment surface 21...Slide core 25...Spring (elastic means) 29...First protruding pin 30...Second protruding pin

Claims (1)

[Claims] A movable mold provided on the movable receiving plate, a fixed mold provided opposite to the movable mold, a slide core partially provided in a space formed between the abutting surfaces of the movable mold and the fixed mold, and the movable receiving plate. In the molding device for an upper case for storing audio cassettes, the apparatus includes a protrusion pin that is provided to be able to protrude through a plate and a movable mold, and a pocket is formed by the slide core at a base end in the longitudinal direction of the flat plate part, the bottom plate of the pocket. A first protruding pin is provided corresponding to the side edge of the flat plate part, a second protruding pin is provided corresponding to the side edge of the flat plate part, and an elastic means is provided interposed between the movable receiving plate and the movable mold. A molding device for an upper case for storing audio cassettes.