Intermittent drive device

Patent metadata

Field	Value
Publication number	US-11480237-B2
Application number	US-202117408472-A
Country	US
Kind code	B2
Filing date	Aug 22, 2021
Priority date	Mar 24, 2021
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

An intermittent drive device includes a tooth-missing gear having a tooth row partially missing, an output gear, an input gear provided with a first tooth row receiving a driving force and a second tooth row transmitting the driving force to the tooth-missing gear and arranged at a position apart from the output gear in a rotation axis direction. A shaft joint member moves in the rotation axis direction to a first position where the driving force is transmitted to the output gear and a second position where the transmission is released. A tooth-missing gear control mechanism starts rotation of the tooth-missing gear from a state where the driving force from the input gear is released and meshes with the input gear. A switching mechanism switches a position of the shaft joint member in the rotation axis direction between the first position and the second position.

First claim

What is claimed is:

1. An intermittent drive device comprising:
a tooth-missing gear in which a tooth row is partially missing;
an output gear;
an input gear that is provided with a first tooth row that receives a driving force and does not come into contact with the tooth-missing gear and a second tooth row that transmits the driving force to the tooth-missing gear and that is arranged at a position apart from the output gear in a rotation axis direction;
a shaft joint member that moves in the rotation axis direction to a first position where the driving force of the input gear is transmitted to the output gear and a second position where the transmission is released;
a tooth-missing gear control mechanism that starts rotation of the tooth-missing gear from a state in which the driving force from the input gear is released and meshes with the input gear; and
a switching mechanism that switches a position of the shaft joint member in the rotation axis direction between the first position and the second position.

2. The intermittent drive device according to claim 1 ,
wherein the tooth-missing gear control mechanism includes
a first spring member that urges the tooth-missing gear in a state in which the driving force from the input gear is released, in a direction of meshing with the input gear, and
a solenoid provided with an arm portion that is hooked on the tooth-missing gear in a state in which the driving force from the input gear is released to prevent rotation made by the first spring member, and that releases the hooking by energizing the solenoid.

3. The intermittent drive device according to claim 2 ,
wherein the switching mechanism includes
a second spring member that urges the shaft joint member toward the first position,
a moving member that receives the urging of the second spring member via the shaft joint member, moves in the rotation axis direction together with the shaft joint member, and is rotatable around the rotation axis,
a cam member that rotates together with the tooth-missing gear to interfere with the moving member and moves the shaft joint member to a third position further away from the first position than the second position, and
a movement positioning member provided with a latch portion having a first groove that interferes with the moving member to move the shaft joint member to the first position, a second groove that holds the shaft joint member at the second position, and a slope that is formed between the first groove and the second groove and performs guiding into the first groove or the second groove, and
the moving member has an acting portion that enters the first groove or the second groove or is in contact with the slope of the latch portion, depending on a rotational position of the moving member.

4. The intermittent drive device according to claim 3 ,
wherein the moving member has an interference portion that interferes with the tooth-missing gear in a case where the shaft joint member moves to the third position, and
the interference portion receives a rotational force from the tooth-missing gear so that the acting portion rotates to a position corresponding to the slope.

5. The intermittent drive device according to claim 2 ,
wherein the tooth-missing gear has a claw portion on which the arm portion is hooked in a state in which the driving force from the input gear is released.

6. The intermittent drive device according to claim 5 ,
wherein the switching mechanism includes
a second spring member that urges the shaft joint member toward the first position,
a moving member that receives the urging of the second spring member via the shaft joint member, moves in the rotation axis direction together with the shaft joint member, and is rotatable around the rotation axis,
a cam member that rotates together with the tooth-missing gear to interfere with the moving member and moves the shaft joint member to a third position further away from the first position than the second position, and
a movement positioning member provided with a latch portion having a first groove that interferes with the moving member to move the shaft joint member to the first position, a second groove that holds the shaft joint member at the second position, and a slope that is formed between the first groove and the second groove and performs guiding into the first groove or the second groove, and

the moving member has an acting portion that enters the first groove or the second groove or is in contact with the slope of the latch portion, depending on a rotational position of the moving member.

7. The intermittent drive device according to claim 6 ,
wherein the moving member has an interference portion that interferes with the tooth-missing gear in a case where the shaft joint member moves to the third position, and
the interference portion receives a rotational force from the tooth-missing gear so that the acting portion rotates to a position corresponding to the slope.

8. The intermittent drive device according to claim 1 ,
wherein the switching mechanism includes
a second spring member that urges the shaft joint member toward the first position,
a moving member that receives the urging of the second spring member via the shaft joint member, moves in the rotation axis direction together with the shaft joint member, and is rotatable around the rotation axis,
a cam member that rotates together with the tooth-missing gear to interfere with the moving member and moves the shaft joint member to a third position further away from the first position than the second position, and
a movement positioning member provided with a latch portion having a first groove that interferes with the moving member to move the shaft joint member to the first position, a second groove that holds the shaft joint member at the second position, and a slope that is formed between the first groove and the second groove and performs guiding into the first groove or the second groove, and

the moving member has an acting portion that enters the first groove or the second groove or is in contact with the slope of the latch portion, depending on a rotational position of the moving member.

9. The intermittent drive device according to claim 8 ,
wherein the moving member has an interference portion that interferes with the tooth-missing gear in a case where the shaft joint member moves to the third position, and
the interference portion receives a rotational force from the tooth-missing gear so that the acting portion rotates to a position corresponding to the slope.

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Tachibana Kohei
• Shiokawa Yuya

Classifications

• F16H27/08 Primary

  with driving toothed gears with interrupted toothing · CPC title

• B41J11/14

  Platen-shift mechanisms; Driving gear therefor · CPC title

• F16H29/12 Primary

  between rotary driving and driven members (F16H29/20, F16H29/22 take precedence) · CPC title