Injection molding machine

Patent metadata

Field	Value
Publication number	US-11840004-B2
Application number	US-202017003618-A
Country	US
Kind code	B2
Filing date	Aug 26, 2020
Priority date	Aug 30, 2019
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

An injection molding machine includes a belt transmission mechanism (mold opening/closing mechanism, ejector mechanism, screw drive mechanism, injection mechanism) configured to transmit drive force from a driving shaft (driving pulley) to a driven shaft (driven pulley) by means of a belt. The injection molding machine includes: a cover covering part or entirety of the belt; and a sensor attached to the cover and configured to detect an abnormality of the belt.

First claim

What is claimed is:

1. An injection molding machine including a belt transmission mechanism configured to transmit drive force from a driving shaft to a driven shaft by use of a belt, the injection molding machine comprising:
a cover covering part of the belt such that one of the driving shaft and the driven shaft is exposed from the cover; and
a sensor attached to the cover and configured to detect an abnormality of the belt,
wherein the sensor is
a displacement sensor configured to detect displacement of the cover.

2. The injection molding machine according to claim 1 , further comprising one or more processors that execute a computer-executable instruction stored in memory,
wherein the one or more processors execute the computer-executable instruction to cause the injection molding machine to give notification of a result detected by the sensor.

3. The injection molding machine according to claim 1 , further comprising:
one or more processors that execute a computer-executable instruction stored in memory,
wherein the one or more processors execute the computer-executable instruction to cause the injection molding machine to:
determine that an abnormality has occurred on the belt if a value detected by the sensor is out of a given range; and
give notification when the abnormality determining unit detects the abnormality of the belt.

4. The injection molding machine according to claim 1 , wherein the belt transmission mechanism moves a crosshead of a toggle link forward and backward by rotation of the driven shaft to thereby open and close a mold.

5. The injection molding machine according to claim 1 , wherein the belt transmission mechanism moves forward and backward an ejector pin configured to eject a molded article from a movable mold by rotation of the driven shaft.

6. The injection molding machine according to claim 1 , wherein the belt transmission mechanism rotates a screw of an injection unit by rotation of the driven shaft to thereby supply a resin material into a cylinder.

7. The injection molding machine according to claim 1 , wherein the belt transmission mechanism moves a screw of an injection unit forward and backward by rotation of the driven shaft to thereby inject a resin material from a cylinder into a mold.

8. The injection molding machine according to claim 1 , wherein the belt comprises a synchronous power transmission belt.

9. The injection molding machine according to claim 3 , wherein the belt transmission mechanism moves a crosshead of a toggle link forward and backward by rotation of the driven shaft to thereby open and close a mold.

10. The injection molding machine according to claim 3 , wherein the belt transmission mechanism moves forward and backward an ejector pin configured to eject a molded article from a movable mold by rotation of the driven shaft.

11. The injection molding machine according to claim 3 , wherein the belt transmission mechanism rotates a screw of an injection unit by rotation of the driven shaft to thereby supply a resin material into a cylinder.

12. The injection molding machine according to claim 3 , wherein the belt transmission mechanism moves a screw of an injection unit forward and backward by rotation of the driven shaft to thereby inject a resin material from a cylinder into a mold.

13. The injection molding machine according to claim 1 ,
wherein the displacement sensor is attached to an outer wall surface, wherein the displacement sensor irradiates a reference portion provided outside of the cover with a laser beam to thereby detect an amount of displacement of the cover relative to the reference portion, and
wherein a thermometer is attached to one of:
the inner wall surface of the cover, wherein the thermometer detects the temperature of the inner wall surface of the cover or the temperature of an atmosphere inside the cover; and
the outer wall surface, wherein the thermometer detects the temperature of the outer wall surface of the cover.

14. An injection molding machine including a belt transmission mechanism configured to transmit drive force from a driving shaft to a driven shaft by use of a belt, the injection molding machine comprising:
a cover covering part of the belt such that one of the driving shaft and the driven shaft is exposed from the cover; and
a sensor attached to the cover and configured to detect an abnormality of the belt,
wherein the sensor includes a displacement sensor configured to detect displacement of the cover, and
wherein the displacement sensor is attached to an outer wall surface, wherein the displacement sensor irradiates a reference portion provided outside of the cover with a laser beam to thereby detect an amount of displacement of the cover relative to the reference portion.

Assignees

• Fanuc Corp

Inventors

• Sugahara Keisuke

Classifications

• B29C45/768 Primary

  Detecting defective moulding conditions (B29C45/84 takes precedence) · CPC title

• B29C45/1775

  Connecting parts, e.g. injection screws, ejectors, to drive means · CPC title

• B29C45/706

  using a single drive system providing both the mould closing and clamping pressure and also the injection pressure, e.g. using a fixed injection piston · CPC title

• B29C45/78

  of temperature · CPC title

• F16H7/02

  with belts; with V-belts · CPC title