Roll holder, image forming apparatus, and liquid discharge apparatus

Patent metadata

Field	Value
Publication number	US-2018257902-A1
Application number	US-201815913809-A
Country	US
Kind code	A1
Filing date	Mar 6, 2018
Priority date	Mar 13, 2017
Publication date	Sep 13, 2018
Grant date	—

Abstract

A roll holder is inserted with a hollow tube of one of a first roll having a first inner diameter and a second roll having a second inner diameter greater than the first inner diameter. The roll holder includes a holder and a cam assembly that are supported by a support shaft and movable in an axial direction of the support shaft. The cam assembly includes an abutment and a cam. The abutment contacts a lateral end of the second roll in the axial direction of the support shaft. The cam presses against one of a first presser and a second presser of the holder in a radial direction of the support shaft to cause the one of the first presser and the second presser to press against and hold an inner circumferential face of the hollow tube of the one of the first roll and the second roll.

First claim

What is claimed is:

1 . A roll holder for being inserted with a hollow tube of one of a first roll having a first inner diameter and a second roll having a second inner diameter greater than the first inner diameter, the roll holder for holding the one of the first roll and the second roll and comprising:
a support shaft; a holder being supported by the support shaft and movable in an axial direction of the support shaft, the holder including:
a first roll holding portion to hold the first roll,
the first roll holding portion including:
a wedge to contact a lateral end of the first roll in the axial direction of the support shaft; and
a first presser being movable about the support shaft in a radial direction of the support shaft; and

a second roll holding portion to hold the second roll,
the second roll holding portion including:
a second presser being movable about the support shaft in the radial direction of the support shaft; and

a cam assembly being supported by the support shaft and movable in the axial direction of the support shaft, the cam assembly including:
an abutment to contact a lateral end of the second roll in the axial direction of the support shaft; and
a cam to move to one of the first presser and the second presser when the one of the first roll and the second roll contacts corresponding one of the wedge and the abutment, the cam to press against the one of the first presser and the second presser in the radial direction of the support shaft to cause the one of the first presser and the second presser to press against and hold an inner circumferential face of the hollow tube of the one of the first roll and the second roll.

2 . The roll holder according to claim 1 ,
wherein the cam contacts a support shaft side face of the one of the first presser and the second presser, the support shaft side face disposed opposite the support shaft.

3 . The roll holder according to claim 1 ,
wherein the lateral end of the first roll and the lateral end of the second roll are placed on an identical hypothetical plane when the holder holds the first roll and the second roll.

4 . The roll holder according to claim 1 ,
wherein the first roll holding portion is combined with the second roll holding portion on the support shaft.

5 . The roll holder according to claim 1 , further comprising an elastic presser cover disposed on the first presser and the second presser, the elastic presser cover to contact the inner circumferential face of the hollow tube of the first roll and the second roll.

6 . The roll holder according to claim 1 ,
wherein the first roll holding portion further includes a lock being disposed opposite and in contact with the wedge, the lock to restrict motion of the first roll holding portion with respect to the support shaft.

7 . The roll holder according to claim 6 ,
wherein the first roll holding portion further includes: a first resilient member to bias the wedge in a direction opposite an insertion direction in which the first roll is inserted into the first roll holding portion; and a second resilient member to bias the lock in a release direction that releases restriction by the lock.

8 . The roll holder according to claim 7 ,
wherein each of the first resilient member and the second resilient member includes a spring.

9 . The roll holder according to claim 7 ,
wherein the wedge includes a first taper and the lock includes a second taper contacting the first taper.

10 . The roll holder according to claim 9 ,
wherein as the first roll contacts and moves the wedge in the insertion direction, the second resilient member moves the lock in the release direction.

11 . The roll holder according to claim 1 ,
wherein the cam assembly further includes: a first stopper to stop the cam assembly; and a second stopper to stop the holder.

12 . The roll holder according to claim 11 , further comprising a retaining ring mounted on the support shaft,
wherein the first stopper comes into contact with the retaining ring.

13 . The roll holder according to claim 11 ,
wherein the second presser includes an abutment portion to contact the cam assembly.

14 . An image forming apparatus comprising:
a roll holder for being inserted with a hollow tube of one of a first roll having a first inner diameter and a second roll having a second inner diameter greater than the first inner diameter; and an image forming device to form an image on a sheet drawn out of the first roll and the second roll, the roll holder for holding the one of the first roll and the second roll and comprising:
a support shaft;
a holder being supported by the support shaft and movable in an axial direction of the support shaft,
the holder including:
a first roll holding portion to hold the first roll,
the first roll holding portion including:
a wedge to contact a lateral end of the first roll in the axial direction of the support shaft; and
a first presser being movable about the support shaft in a radial direction of the support shaft; and

a second roll holding portion to hold the second roll,
the second roll holding portion including:
a second presser being movable about the support shaft in the radial direction of the support shaft; and

a cam assembly being supported by the support shaft and movable in the axial direction of the support shaft,
the cam assembly including:
an abutment to contact a lateral end of the second roll in the axial direction of the support shaft; and
a cam to move to one of the first presser and the second presser when the one of the first roll and the second roll contacts corresponding one of the wedge and the abutment, the cam to press against the one of the first presser and the second presser in the radial direction of the support shaft to cause the one of the first presser and the second presser to press against and hold an inner circumferential face of the hollow tube of the one of the first roll and the second roll.

15 . A liquid discharge apparatus comprising:
a roll holder for being inserted with a hollow tube of one of a first roll having a first inner diameter and a second roll having a second inner diameter greater than the first inner diameter; and a liquid discharge head to discharge liquid onto a sheet drawn out of the first roll and the second roll, the roll holder for holding the one of the first roll and the second roll and comprising:
a support shaft;
a holder being supported by the support shaft and movable in an axial direction of the support shaft,
the holder including:
a first roll holding portion to hold the first roll,
the first roll holding portion including:
a wedge to contact a lateral end of the first roll in the axial direction of the support shaft; and
a first presser being movable about the support shaft in a radial direction of the support shaft; and

a second roll holding portion to hold the second roll,
the second roll holding portion including:
a second presser being movable about the support shaft in the radial direction of the support shaft; and

a cam assembly being supported by the support shaft and movable in the axial direction of the support shaft,
the cam assembly including:
an abutment to contact a lateral end of the second roll in the axial direction of the support shaft; and
a cam to move to one of the first presser and the second presser when the one of the first roll and the second roll contacts corresponding one of the wedge and the abutment, the cam to press against the one of the first presser and the second presser in the radial dire

Assignees

• Honda Ryo
• Ricoh Co Ltd

Inventors

• Honda Ryo

Classifications

• B65H2405/40

  Holders, supports for rolls · CPC title

• B65H75/18 Primary

  Constructional details · CPC title

• B41J15/04

  Supporting, feeding, or guiding devices; Mountings for web rolls or spindles · CPC title

• B65H75/245 Primary

  by deformation of an elastic or flexible material (B65H75/2437 takes precedence) · CPC title