JPH0245120A - Mold thickness adjusting mechanism of injection molding apparatus - Google Patents

Abstract

PURPOSE:To improve the efficiency in assembling a mechanism and arranging a rear platen in parallel by fitting a tie-bar nut with a sprocket by a key and a retaining ring and rotatably mounting each tie-bar in a fixed platen and a rear platen, in a mold thickness adjusting mechanism of an injection molding apparatus. CONSTITUTION:After each tie-bar nut 5 is fitted with a sprocket 4 by a key 12 and a retaining ring 13, the tie-bar nut 5 is fastened with a screw portion 3 at a rear end portion of each the-bar which passes through a rear platen 1. Each tie-bar nut 5 is rotated independently, so that the rear platen 1 can be placed approximately parallel to the fixed platen. Then, a chain 8 is wound around every sprocket 4 to hinger the tie-bar nut 5 from moving in a floating manner. And, each tie-bar 2 is independently rotated by a rotating tool provided in each tool portion 16 of tie-bar. After the rear platen 1 is further adjusted to be parallel, it is assembled into a mechanism. Thus, the parallelism of the rear platen 1 can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an electric mold thickness adjustment mechanism for adjusting the distance of a rear platen to a fixed platen in an injection molding machine.

Prior Art Conventionally, the mold thickness adjustment mechanism of an injection molding machine was constructed on the rear surface of the rear platen 1 in the mold clamping unit as shown in FIG. The tie burpts 5 provided are screwed together, and the tie burpts 5 are attached to the rear surface of the rear platen 1 with a collar 6.
It has a structure in which a chain 8 driven by a mold thickness adjustment motor 7 is wound around each sub (1 to 4) so as to be rotatable.

In this case, the sprocket 4 is fitted into the boss portion 9 of the tie bar nut 5, and then is fixed to the shoulder portion 10 of the nut 5 (with a plurality of bolts 11).

However, since only relatively thin bolts 11 can be used, the coupling force between the sprocket 4 and the tie bar nut 5 is weak when only these poles are fastened, and when the mold thickness is repeatedly adjusted, play may occur between the two. be.

In addition, in this type of die thickness adjustment mechanism, when assembling the rear platen 1 and the tie bars 2, each tie bar 2 is passed through the rear platen 1, and the tie bar nut 5 is screwed into the threaded portion 3 at the rear end, so that these can be individually connected. It rotates to achieve parallel alignment of the rear platen 1 with respect to the fixed platen. At this time, each tie bar nut 5 times! 71ffi is unpredictable. For this purpose, if you attach the sprockets 4 to the tie bar nut 5 in advance, each sprocket 4
There may be cases where the chains 8 cannot be completely wrapped around each sprocket 4 because the phases of the tooth positions do not match between them. After that, a tap hole is formed in the shoulder part 10 of the tie bar nut 5 and the bolt 11 is inserted as shown in the figure.
It is fixed at

For this reason, the assembly process is very complicated, and if the number of bolts 11 is increased in order to increase the bonding force, this problem will be further exacerbated.

It should be noted that integrally molding the tie bar nut 5 and the sprocket 4 requires additional machining, and as described above, adjustment cannot be made if the pitch of the teeth on the sprocket and the pitch of the chain do not match.

Problem to be Solved by the Invention It is an object of the invention to provide a mold thickness adjustment mechanism for an injection molding machine that allows easy attachment of a sprocket to a tie bar nut and allows adjustment to arrange a rear platen parallel to a fixed platen.

Means for solving the problem: Attach the tie bar 1- and sprocket in the mold thickness adjustment mechanism of an injection molding machine with a locking key and a resoning ring, which locks the handle, and each tie bar is rotatably attached to the fixed platen and rear platen. , and a rotary tool hook is formed in advance.

Function: The 4-ring that prevents rotation and the resonating ring that prevents removal are tied together!・The sprocket can be easily attached to the rear platen, and the rotating tool hook provided on the tie bar simplifies the adjustment work to achieve parallel arrangement of the rear platen.

Embodiment FIG. 1 shows the characteristic parts of the mold thickness adjustment mechanism according to the present invention. Like the conventional one, each tie bar 2 is constructed on the rear surface of the rear platen 1 in the mold clamping unit and protrudes rearward from the rear platen 1. A quipal nut 5 equipped with a sprocket 4 is screwed into a threaded portion 3 formed at the rear end,
That oak! 5 is rotatably supported by a collar 6 on the rear surface of the rear platen 1.

Each tie bar 2 has its front end rotatably attached to a fixed platen, and its end 11 extends through the rear platen 1 and is arranged in parallel.

A chain 8 driven by a mold thickness adjusting motor 7 is wound around each sprocket 4.

The sprocket 4 is fitted into the boss portion 9 of the typal nut 5 until it abuts against the shoulder portion 10 of the nut, and the rotational direction is fixed with 4-12.Furthermore, the resonating ring 13 is attached in contact with the rear surface of the sprocket 4. , screw the fixing nut 14 into the threaded portion 15 of the boss portion 9 of the tie bar nut 5 from behind, and attach the resonating ring 13 to the sub-O socket 1-.
Fix it to 4 and 4-12 with the pusher number and pull it out backward 1)
I'm trying to stop it.

The resoning ring 13 is a strong spring body having a shape as shown in FIG. 2, for example.

Further, each tie bar 2 is provided with a pivot hook portion 16 at an appropriate position in the axial direction. As shown in FIG. 3, this portion 16 has a part of the circumferential surface of the tie bar 2 flattened to make it easier to hang a tool for rotating the tie bar 2.

This mold thickness adjustment mechanism is assembled as follows.

First, attach sprocket 4 to each tie bar nut 5 using key 12.
After attaching it with a resoning ring 13, this is screwed onto the threaded portion 3 of each tie bar 11 which penetrates through the rear platen 1, and the assembly is performed for the time being. Next, the tie bar nuts 5 are individually rotated to arrange the rear platen 1 substantially parallel to the fixed platen. Then, the chain 8 is passed around each sprocket 4 to close the T1 movement of each tie bar nut 5, and the tool U of each tie bar 2 is attached to the part 16.
By individually rotating the tie bars 2 using a suitable rotation tool, the parallel arrangement of the rear platen 1, which has been almost arranged as described above, is further adjusted and the assembly is completed.

After assembly, a chain 8 is passed around each sprocket 4 and connected to the mold thickness adjustment motor 7, so each sprocket 4 does not move Tl, and the mold thickness adjustment motor 7 is driven. Then, since these are rotated in synchronization, the parallel arrangement of the rear platen 1 is maintained in any case.

In addition, if the parallel arrangement of rear platen 1 becomes incorrect after assembly due to parts replacement or other reasons, each tie bar to 2
respectively) into the birthing room and adjust the inclination of the rear platen 1 as desired to recover.

Effects of the Invention The sprocket can be easily attached to the tie bar nut.

Parallel alignment of the rear platens can be easily achieved by rotating the quiver.

As a result, the efficiency of assembly and the parallel arrangement of rear platens are improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts, Figure 2 is a plan view, and Figure 3 is a cross-sectional view of the main parts.
FIG. 4 is a cross-sectional view taken along the line L-4 in the figure, and FIG. 4 is a cross-sectional view of the main part of the conventional example. DESCRIPTION OF SYMBOLS 1... Rear platen, 2... Tie bar, 3... Thread part, 4... Sprocket, 5... Tie bar nut, 6... Collar, 7... Motor for mold thickness adjustment, 8...
...Chain, 9...Boss part, 10...Shoulder part, 11
... Bolt, 12 ... Key, 13 ... Rear lining ring, 14 ... Fixing nut, 15 ... Threaded part,
16...Rotating tool hook is part. Patent applicant: FANUC CORPORATION Figure 1

Claims (1)

[Claims] The rear end of each tie bar, whose front end is rotatably attached to a fixed platen, protrudes rearward from the rear platen, and a tie bar nut equipped with a sprocket is screwed into the threaded portion provided at the rear end. is rotatably supported on the rear surface of the rear platen, and a chain driven by a clamping motor runs around each sprocket, and the sprocket is attached to the tie bar nut with a locking key and a retaining ring to prevent it from coming off. , a mold thickness adjustment mechanism for an injection molding machine, characterized in that each tie bar is formed with a rotary tool hook.