Screw driving device, injection device and injection molding machine

Patent metadata

Field	Value
Publication number	US-11759987-B2
Application number	US-202217673170-A
Country	US
Kind code	B2
Filing date	Feb 16, 2022
Priority date	Feb 17, 2021
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A screw driving device includes: a plasticization motor; a rotation drive shaft provided coaxially with a screw and configured to rotate the screw; and a transmission mechanism configured to decelerate rotation of the plasticization motor and transmit the rotation to the rotation drive shaft. The transmission mechanism includes: a speed reducer whose output shaft is coupled to the rotation drive shaft; a drive rotation member provided in the plasticization motor; a driven rotation member provided on an input shaft of the speed reducer; and one endless string-shaped force transmission member wound around the drive rotation member and the driven rotation member.

First claim

What is claimed is:

1. A screw driving device comprising:
a plasticization motor;
a rotation drive shaft provided coaxially with a screw and configured to rotate the screw; and
a transmission mechanism configured to decelerate rotation of the plasticization motor and transmit the rotation to the rotation drive shaft,
wherein the transmission mechanism includes:
a speed reducer whose output shaft is coupled to the rotation drive shaft;
a drive rotation member provided in the plasticization motor;
a driven rotation member provided on an input shaft of the speed reducer; and
one endless string-shaped force transmission member wound around the drive rotation member and the driven rotation member

wherein the input shaft of the speed reducer connects to the speed reducer through a first axis, and the output shaft of the speed reducer connects to the speed reducer through a second axis provided coaxially to the rotation drive shaft and the screw,
wherein the first axis and the second axis are parallel.

2. The screw driving device according to claim 1 ,
wherein the drive rotation member is formed of a drive pulley, the driven rotation member is formed of a driven pulley, and the force transmission member is formed of a timing belt.

3. The screw driving device according to claim 1 ,
wherein the input shaft of the speed reducer is disposed at a position spaced apart from an extension line of an axis of the screw.

4. The screw driving device according to claim 1 ,
wherein the screw and the rotation drive shaft are integrally connected.

5. The screw driving device according to claim 1 ,
wherein the input shaft of the speed reducer is disposed in an upper portion of the speed reducer and the output shaft of the speed reducer is disposed in a lower portion of the speed reducer,
wherein an axis of the input shaft is parallel to an axis of the output shaft.

6. An injection device comprising:
a heating cylinder;
a screw provided in the heating cylinder; and
a screw driving device configured to drive the screw,
wherein the screw driving device includes:
a plasticization motor;
a rotation drive shaft provided coaxially with the screw and configured to rotate the screw; and
a transmission mechanism configured to decelerate rotation of the plasticization motor and transmit the rotation to the rotation drive shaft, and

wherein the transmission mechanism includes:
a speed reducer whose output shaft is coupled to the rotation drive shaft;
a drive rotation member provided in the plasticization motor;
a driven rotation member provided on an input shaft of the speed reducer; and
one endless string-shaped force transmission member wound around the drive rotation member and the driven rotation member

wherein the input shaft of the speed reducer connects to the speed reducer through a first axis, and the output shaft of the speed reducer connects to the speed reducer through a second axis provided coaxially to the rotation drive shaft and the screw,
wherein the first axis and the second axis are parallel.

7. The injection device according to claim 6 ,
wherein the drive rotation member is formed of a drive pulley, the driven rotation member is formed of a driven pulley, and the force transmission member is formed of a timing belt.

8. The injection device according to claim 6 ,
wherein the input shaft of the speed reducer is disposed at a position spaced apart from an extension line of an axis of the screw.

9. The injection device according to claim 6 ,
wherein the screw and the rotation drive shaft are integrally connected.

10. An injection molding machine including:
an injection device configured to inject a resin; and
a mold clamping device configured to clamp a mold,
wherein the injection device includes:
a heating cylinder;
a screw provided in the heating cylinder; and
a screw driving device configured to drive the screw,

wherein the screw driving device includes:
a plasticization motor;
a rotation drive shaft provided coaxially with the screw and configured to rotate the screw; and
a transmission mechanism configured to decelerate rotation of the plasticization motor and transmit the rotation to the rotation drive shaft, and

wherein the transmission mechanism includes:
a speed reducer whose output shaft is coupled to the rotation drive shaft;
a drive rotation member provided in the plasticization motor;
a driven rotation member provided on an input shaft of the speed reducer; and
one endless string-shaped force transmission member wound around the drive rotation member and the driven rotation member

wherein the input shaft of the speed reducer connects to the speed reducer through a first axis, and the output shaft of the speed reducer connects to the speed reducer through a second axis provided coaxially to the rotation drive shaft and the screw,
wherein the first axis and the second axis are parallel.

11. The injection molding machine according to claim 10 ,
wherein the drive rotation member is formed of a drive pulley, the driven rotation member is formed of a driven pulley, and the force transmission member is formed of a timing belt.

12. The injection molding machine according to claim 10 ,
wherein the input shaft of the speed reducer is disposed at a position spaced apart from an extension line of an axis of the screw.

13. The injection molding machine according to claim 10 ,
wherein the screw and the rotation drive shaft are integrally connected.

Assignees

• Japan Steel Works Ltd

Inventors

• Negi Hiroshi

Classifications

• B29C45/50 Primary

  Axially movable screw · CPC title

• B29C45/5008 Primary

  Drive means therefor · CPC title

• B29C45/17

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

• B29C45/66

  mechanical · CPC title

• B29C45/67

  hydraulic · CPC title