Mold clamping device and method

Patent metadata

Field	Value
Publication number	US-10688704-B2
Application number	US-201616070906-A
Country	US
Kind code	B2
Filing date	Dec 26, 2016
Priority date	Jan 19, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

Moving servo motors of molds in synchronization with the operations of platens which enables fine patterns or shapes to be formed even on a large molded article. A mold clamping device forms patterns or the like on a molded article by detecting a mold position of a second platen among first, second, third platens with digital mold opening/closing position detector, and driving servo motors for molds of the molds in synchronization with a digital mold opening/closing position signal from the digital mold opening/closing position detector.

First claim

The invention claimed is:

1. A mold clamping device that moves, with an actuator, at least a second platen among first, second, and third platens provided on a base via a tie bar, and closes and opens first and second molds provided on the second and third platens, respectively, the mold clamping device comprising:
servo motor(s) for the molds provided in at least one or both of the respective molds; and
digital mold opening/closing position detection means provided on the base and detecting a mold position of the second platen, wherein
one or both of the servo motors for the first and second molds are configured to be driven in synchronization with a digital mold opening/closing position signal from the digital mold opening/closing position detection means.

2. The mold clamping device according to claim 1 , wherein the first and third platens are configured to move with the second platen.

3. The mold clamping device according to claim 1 , wherein the digital mold opening/closing position detection means is formed from a combination of any of an encoder, a resolver and a magnetic encoder, and a rack-and-pinion.

4. The mold clamping device according to claim 1 , wherein the mold clamping device is combined with a blow molding machine.

5. The mold clamping device according to claim 1 , wherein the digital mold opening/closing position detection means is formed from a servo motor with a rotation detector, and a ball screw.

6. A mold clamping method for moving, with an actuator, at least a second platen among first, second, and third platens provided on a base via a tie bar, and closing and opening first and second molds provided on the second and third platens, respectively, the mold clamping method comprising:
using servo motor(s) for the molds provided in at least one or both of the respective molds and digital mold opening/closing position detection means provided on the base and detecting a mold position of the second platen; and
driving one or both of the servo motors for the first and second molds in synchronization with a digital mold opening/closing position signal from the digital mold opening/closing position detection means.

7. The mold clamping method according to claim 6 , wherein the first and third platens move with the second platen.

8. The mold clamping method according to claim 6 , wherein the digital mold opening/closing position detection means is formed from a combination of any of an encoder, a resolver and a magnetic encoder and a rack-and-pinion.

9. The mold clamping method according to claim 6 , wherein the mold clamping method is combined with a blow molding machine.

10. The mold clamping method according to claim 6 , wherein the digital mold opening/closing position detection means is formed from a servo motor with a rotation detector, and a ball screw.

Assignees

• Japan Steel Works Ltd

Inventors

• Ikegaya Masanosuke
• Fujiwara Yukio
• Suzuki Kazunari
• Okuoka Toshimitsu

Classifications

• B29C49/5605

  Hydraulically operated, i.e. closing or opening of the mould parts is done by hydraulic means · CPC title

• B29C49/04114

  for keeping constant thickness · CPC title

• B29C49/5607

  Electrically operated, e.g. the closing or opening is done with an electrical motor direct drive · CPC title

• B29C49/20

  of articles having inserts or reinforcements {; Handling of inserts or reinforcements} · CPC title

• B29C49/78 Primary

  Measuring, controlling or regulating · CPC title