JPH06226801A - Swivel device for injection unit - Google Patents

Abstract

PURPOSE:To lightly conduct a swiveling operation even in an inclined state of a nozzle at the time of regulating the nozzle by supporting a pivot pin provided between a nozzle touching unit for the swiveling operation and an injection unit of an injection molding machine by a spherical bearing. CONSTITUTION:A pivot pin 6 mounted at an extruder base 10 is supported by a spherical bearing. 13. The bearing 13 is engaged with a stepped recess hole 17 formed on the base 10, a fixing unit is placed on the stepped part, and removal of the bearing 13 is prevented by a screw 18 from its side. The pin 6 engaged with a through hole 15 of a sphere 16 to be mounted, and an injection unit 3 is engaged with a recess 19 at its upper part to connected the unit 3 to a nozzle touching unit 4. The unit 3 can be rotated along an upper surface of the unit 4 on the pivot 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel device for an injection unit in an injection molding machine.

[0002]

2. Description of the Related Art In a horizontal injection molding machine as shown in FIG. 3, a mold clamping unit 2 and an injection unit 3 are arranged on a machine base 1 so as to face each other, and the injection unit 3 is attached to a nozzle touch unit 4. It can be moved back and forth with respect to the mold clamping unit 2.

The axis a of the cylinder assembly 5 in the injection unit 3 normally faces the front of the mold clamping unit 2. However, in the injection unit 3, the cylinder assembly 5 is a portion that needs to be removed for replacement or inspection, and at the time of removal, a swivel operation is possible to facilitate the extraction operation.

That is, the injection unit 3 is fitted and coupled to a vertical pivot pin 6 fixed to a nozzle touch unit 4 which is moved back and forth on the machine base 1, and the injection unit 3 is pivoted when necessary. Rotate around the pin 6 along the upper surface of the nozzle touch unit 4,
The axis a of the cylinder assembly 5 is the mold clamping unit 2
It can be turned in the direction not intersecting with (Fig. 4, a ').

On the other hand, between the injection unit 3 and the nozzle touch unit 4, the tip of the cylinder assembly 5, that is, the vertical position of the tip of the nozzle is adjusted to adjust the mold clamping unit 2.
The nozzle center adjustment bolt 7 is arranged so that it can be aligned with the sprue hole of the mold attached to the. The bolt 7 adjusts the nozzle center by adjusting the distance between the front end of the injection unit and the nozzle touch unit 4. The result of the adjustment is as shown by the chain line in FIG. Injection unit 3
Will be slightly inclined.

By the way, this swivel operation is performed by pushing the injection unit 3 by hand after removing the fixing member for preventing the floating motion. Then, the injection unit 3 may be tilted with respect to the nozzle touch unit 4 by adjusting the nozzle center, but at this time, the fitting between the injection unit 3 and the pivot pin 6 is twisted, and the injection unit 3 is twisted. The movement becomes stiff. When the injection molding machine is small, the operator can rotate it even in such a situation, but the swivel operation can be easily performed with a large injection molding machine in which the weight of the injection unit 3 is about 3t. Can not.

In FIGS. 3 and 4, reference numeral 8 is a nozzle touch motor which drives the ball screw 9. The ball screw 9 is screwed with a ball nut 12 attached to the tip of the extruder base 10 via a touch pressure spring 11. When the ball screw 9 is driven in the forward direction, the injection unit 3 advances and the tip of the nozzle comes into contact with the mold. The ball screw 9 is further driven to compress the touch spring 11 with the ball nut 12 and stop when a predetermined touch pressure is achieved.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a swivel device which does not twist the fitting of the injection unit and the pivot pin when the swivel is operated.

[0009]

A pivot pin that connects a nozzle touch unit and an injection unit is supported by a spherical bearing.

[0010]

The spherical bearing allows the tilting of the pivot pin with respect to the nozzle touch unit, and prevents the twisting of the injection unit due to the tilting of the injection unit.

[0011]

1 shows the position of a pivot pin 6 of a swivel device according to the invention. Configurations other than this part
Since the structure is the same as that of the conventional example shown in FIGS. 3 and 4, detailed description thereof will be omitted. Further, the same reference numerals are used for the same members as the conventional ones.

A pivot pin 6 mounted on the front part of the extruder base 10 is supported by a spherical bearing 13. The spherical bearing 13 is composed of a fixed body 14 and a ball 16 having a through hole 15 in the longitudinal direction at the center, and the ball 16 is fitted into the fixed body 14 so as not to fall off and to be rotatable in any direction. ing. The spherical bearing 13 is fitted in the stepped recessed hole 17 formed in the extruder base 10,
The fixed body 14 is mounted on the stepped portion, and is mounted by preventing the spherical bearing 13 from coming off from the side with a screw 18.

The pivot pin 6 has a small-diameter portion on the lower side of the sphere 1.
6 is fitted into the through hole 15 and is attached, and the injection unit 3 is fitted into the recessed hole 19 on the upper part thereof to connect the injection unit 3 and the nozzle touch unit 4.

With the above-described structure, the injection unit 3 can be rotated around the pivot pin 6 along the upper surface of the nozzle touch unit 4, and the injection unit 3 is indicated by the chain line in FIG. 1 with respect to the nozzle touch unit 4. Even when the injection unit 3 is tilted as described above, the pivot pin 6 is supported by the spherical bearing 13 and tilts its axis line. Therefore, even if the injection unit 3 is rotated with the nozzle center being adjusted, the pivot pin 6 is not supported. There is no twist between them. Therefore, the swivel operation does not become heavy.

The above is one embodiment, and the present invention is not limited to the illustrated specific configuration. For example, the spherical bearing 13
May have a structure in which a spherical portion formed integrally with the lower portion of the pivot pin 6 is simply fitted into a hole provided in the extruder base 10.

[0016]

EFFECT OF THE INVENTION The injection unit can be swiveled lightly while the nozzle center is adjusted. In particular, even in a large injection molding machine, one operator can easily perform swivel operation.

[Brief description of drawings]

FIG. 1 is a front view showing a main portion in section.

FIG. 2 is a front view showing a cross section of a main part (conventional example).

FIG. 3 is a front view showing a main part of the injection molding machine.

FIG. 4 is a plan view of a nozzle touch unit.

[Explanation of symbols]

 1 Machine base 2 Mold clamping unit 3 Injection unit 4 Nozzle touch unit 5 Cylinder assembly 6 Pivot pin 7 Nozzle center adjustment bolt 8 Nozzle touch motor 9 Ball screw 10 Extruder base 11 Touch pressure spring 12 Ball nut 13 Spherical bearing 14 Fixed body 15 Through Hole 16 Sphere 17 Recessed Hole 18 Screw 19 Recessed Hole

Claims (1)

[Claims] 1. A structure in which an injection unit is coupled to an upper portion of a nozzle touch unit via a pivot pin, and the injection unit is rotatably arranged along an upper surface of the nozzle touch unit, wherein the pivot pin is a spherical bearing. The swivel device for the injection unit, which is supported by