JPH0729339B2 - Disk mold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a disc as a disc-shaped recording medium such as a video disc or an audio disc.

[0002]

2. Description of the Related Art In this type of disk molding, a stamper having a pit pattern is attached to either one or both of a fixed-side mold plate and a movable-side mold plate of a mold. The inner peripheral portion is held by the inner peripheral pressing member and the outer peripheral portion is held by the outer peripheral pressing member.

The outer peripheral pressing member is composed of a ring member provided between the mold plates so as to seal the outer peripheral region of the cavity, and a stamper holding portion integrally formed on the inner periphery of the ring member. It is designed to be detachably attached to one template with bolts.

[0004]

By the way, according to the above-mentioned conventional structure, when the stamper is replaced, the bolt is removed and then the ring member is removed while holding it by hand, and another stamper is attached by the inner peripheral pressing member. After attaching to the template, the ring member must be bolted again, but it is laborious because the ring member is a considerable weight, and
Since there is a risk of dropping the floor and damaging it, it is necessary to pay attention to it, which is troublesome and complicated in the replacement work.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk molding die capable of easily and safely exchanging a stamper with a simple operation without requiring labor and improving the efficiency of the exchanging work.

[0006]

The present invention was devised to achieve the above-mentioned object, and is characterized in that the ring members are fixed to the fixed-side mold plate and the movable-side mold plate at corresponding positions. A plurality of through holes for the through bolts are formed, and screw holes for screwing the through bolts are formed on both sides of the ring member.

[0007]

According to the present invention, when the stamper is replaced,
The through bolts are removed in the mold closed state, and the ring member is inserted into the other mold plate that is not originally fixed and screwed to the opposite side of the ring member. As a result, the ring member is in a temporarily fixed state in which it is fixed to the other template. In this state, the mold is opened and the stamper is replaced. When the stamper replacement is completed, each through bolt is removed from the other mold plate in the mold closed state again, and is inserted into the mold plate having the stamper and screwed to the ring member.

[0008]

1 to 3 show an embodiment of the present invention.
The mold 2 is provided with a fixed-side mold plate 4 and a movable-side mold plate 6, so that the mold 2 is directly supported and opened / closed by two guide rods 8 which also have a tie bar function without using a die plate. It has become. As the guide rod 8, for example, a rod of a mold clamping cylinder (not shown) can be directly used, and the fixed side mold plate 4 can be held by the bearing member 10 so as to be smoothly slidable. The nozzle 12 is inserted into the nozzle guide hole 4a formed in the fixed-side template 4 for injection.

The sprue bush 1 is provided at the center of the fixed-side template 4.
4 is attached, and a fixed-side mirror surface portion 16 which is one of the constituent elements of the cavity is provided on the mold facing surface of the sprue bush 1.
4 and the outer peripheral portion is fixed by a bolt 17 and attached. A stamper S as a transfer base material is attached to the fixed-side mirror surface portion 16, and the stamper S is held by an inner peripheral pressing member (not shown) and an outer peripheral pressing member 18. .

The outer peripheral pressing member 18 is composed of a ring member 20 which also serves as a spacer between the molds and seals the outer peripheral region of the cavity, and a stamper holding portion 22 which is integrally formed on the inner periphery of the ring member 20. There is. Further, screw holes 20a are formed on both sides of the ring member 20,
Through bolt 2 penetrating the fixed-side template 4 or the movable-side template 6
4, the fixed-side template 4 does not require manual holding operation.
And the movable side mold plate 6 can be arbitrarily attached and converted.

On the other hand, a gate cut member 26 is attached to the central portion of the movable side mold plate 6, and a movable side mirror surface portion 28 which is the other component of the cavity is attached to the mold facing surface. The gate cut member 26 is a movable mold plate 6
And a cut pin 34 that has a sprue ejector pin and is movably provided in the cylinder member 30.

The movable side mirror surface portion 28 is fitted to the cylinder member 30 like the fixed side mirror surface portion 16, and the outer peripheral portion is fixed by bolts 29.

Next, the mounting and converting operation of the ring member 20 by the through bolt 24 at the time of replacing the stamper will be described. While the mold is closed, the through bolts 24 are sequentially removed to remove the movable mold plate 6
It is screwed to the other side of the ring member 20 through the insertion hole 6a. When the through bolts 24 are all attached to the movable side mold plate 6 and the mold is opened, the ring member 20 is converted from the fixed side mold plate 4 to the movable side mold plate 6 as shown in FIGS. 2 and 3. .

In this state, the stamper S is attached to the fixed side mirror surface portion 16
When the through bolts 24 are attached to the fixed side mold plate 4 again in the same procedure as described above in a mold closed state, the outer peripheral pressing member 18 is attached in close contact with the inner peripheral pressing member. Then, the outer peripheral portion of the stamper S is held.

According to the above construction, the stamper exchange state can be easily obtained without holding the outer peripheral pressing member 18, which is a heavy object, by the simple operation of moving the through bolt 24, and thus the work efficiency is improved. In addition to being able to improve the safety, it is possible to improve the safety because there is no fear of dropping it on the floor or the like.

[0016]

According to the present invention, it is possible to easily obtain the stamper replacement state by holding the ring member, which is a heavy object, by the operation of transferring the through bolt, thereby improving the work efficiency. In addition, since there is no fear of dropping it on the floor surface or the like, it is possible to prevent damage accidents of the ring member and improve safety.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a disk molding die according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a ring member is converted and the mold is opened.

FIG. 3 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 4 Fixed-side template 6 Movable-side template 20 Ring member 20a Screw hole 22 Stamper holding part 24 Through bolt

Claims (1)

[Claims] 1. A ring member for holding an outer peripheral portion of a stamper
Close the cavity outer area between the fixed mold plate and the movable mold plate.
It is provided in a closed state and either one of the above
The mold for disc molding fixed to the mold plate of
Te, corresponding respectively to said fixed die plate and the movable side mold plate
Through bolt for fixing the ring member at a certain position.
There are multiple insertion holes for the
Formed screw holes on both sides of the member to screw the through bolts
A metal mold for disk molding, which is characterized by being