Mold clamping device and injection molding machine

Patent metadata

Field	Value
Publication number	US-12589537-B2
Application number	US-202318348890-A
Country	US
Kind code	B2
Filing date	Jul 7, 2023
Priority date	Jul 8, 2022
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

A mold clamping device includes two mold platens; a plurality of ball screw mechanisms connecting the mold platens to each other; and a plurality of servo motors configured to drive the respective ball screw mechanisms. Each of ball screws respectively configuring the plurality of ball screw mechanisms is provided with a cover which covers at least a part of the corresponding ball screw between the two mold platens.

First claim

What is claimed is:

1 . A mold clamping device comprising:
two mold platens; a plurality of ball screw mechanisms connecting the mold platens to each other; and a plurality of servo motors respectively provided on the plurality of ball screw mechanisms and configured to drive the respective ball screw mechanisms, wherein the plurality of ball screw mechanisms respectively includes ball screws, wherein each of the plurality of ball screws is provided with a cover that covers at least a part of the corresponding ball screw between the two mold platens, wherein the cover provided between the two mold platens on each of the plurality of ball screws includes a first cover body provided on one of the mold platens and a second cover body provided on the other of the mold platens, and wherein the first cover body and the second cover body are concentrically separated and maintained out of contact with each other.

2 . The mold clamping device according to claim 1 , wherein the cover covers the ball screw over an entire length thereof between the two mold platens.

3 . The mold clamping device according to claim 1 ,
wherein one end portions of the plurality of ball screws protrude outward from one of the mold platens, and wherein the mold clamping device further comprises outer covers that cover the respective protruding portions of the plurality of ball screws protruded outward from the one of the mold platens.

4 . The mold clamping device according to claim 1 ,
wherein in a case where the two mold platens are driven in a mold closing direction, the first cover body is configured to be inserted into the second cover body.

5 . The mold clamping device according to claim 1 , wherein the cover is made of metal.

6 . The mold clamping device according to claim 1 , wherein the cover is provided with a grease reservoir structure configured to receive grease scattered from the ball screw.

7 . The mold clamping device according to claim 6 , wherein the cover has a grease drain structure for discharging grease scattered from the ball screw to an outside.

8 . An injection molding machine comprising:
an injection device configured to inject an injected material; and a mold clamping device configured to clamp a mold, the mold clamping device comprising:
two mold platens;
a plurality of ball screw mechanisms connecting the mold platens to each other; and
a plurality of servo motors respectively provided on the plurality of ball screw mechanisms and configured to drive the respective ball screw mechanisms,
wherein the plurality of ball screw mechanisms respectively includes ball screws, wherein each of the plurality of ball screws is provided with a cover that covers at least a part of the corresponding ball screw between the two mold platens, wherein the cover provided between the two mold platens on each of the plurality of ball screws includes a first cover body provided on one of the mold platens and a second cover body provided on the other of the mold platens, and wherein the first cover body and the second cover body are concentrically separated and maintained out of contact with each other.

9 . The injection molding machine according to claim 8 , wherein the cover covers the ball screw over an entire length thereof between the two mold platens.

10 . The injection molding machine according to claim 8 ,
wherein one end portions of the plurality of ball screws protrude outward from one of the mold platens, and wherein the injection molding machine further comprises outer covers that cover the respective protruding portions of the plurality of ball screws protruded outward from the one of the mold platens.

11 . The injection molding machine according to claim 8 ,
wherein in a case where the two mold platens are driven in a mold closing direction, the first cover body is configured to be inserted into the second cover body.

12 . The injection molding machine according to claim 8 , wherein the cover is made of metal.

13 . The injection molding machine according to claim 8 , wherein the cover is provided with a grease reservoir structure configured to receive grease scattered from the ball screw.

14 . The injection molding machine according to claim 13 ,
wherein the cover has a grease drain structure for discharging grease scattered from the ball screw to an outside.

Assignees

• Japan Steel Works Ltd

Inventors

• Mitani Souma

Classifications

• B29C33/202 Primary

  Clamping means operating on closed or nearly closed mould parts, the clamping means being independently movable of the opening or closing means (clamping devices for injection moulding machines B29C45/64) · CPC title

• B29C2045/665

  using a screw or screws having differently threaded parts arranged in series · CPC title

• B29C2045/835

  for ball screws or ball nuts · CPC title

• B29C45/17 Primary

  Component parts, details or accessories; Auxiliary operations · CPC title

• B29C45/83

  Lubricating means · CPC title