Sheet detecting device and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9950887-B2
Application number	US-201615069780-A
Country	US
Kind code	B2
Filing date	Mar 14, 2016
Priority date	Mar 17, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

After a detection flag and a detection member are integrally rotated as a result of the detection flag being pushed by a sheet, the detection flag is rotated relative to the detection member, with the detection member being in contact with an abutting portion.

First claim

What is claimed is:

1. A sheet detecting device comprising:
a contact member that comes into contact with a conveyed sheet and is rotated;
a detection member configured to be rotatable independently from the contact member, the detection member being a different member from the contact member;
a sensor configured to detect the detection member;
a first urging member configured to act on the detection member and the contact member;
a second urging member configured to act on the contact member such that the contact member and the detection member are located at a standby position;
a positioning part configured to position the contact member urged by the second urging member; and
a stopper with which the detection member comes into contact,
wherein, after the contact member and the detection member are integrally rotated from the standby position as a result of the contact member being pushed by the sheet, the contact member can be further rotated relative to the detection member in a state where the detection member is in contact with the stopper and in a case where the sensor has detected the detection member.

2. The sheet detecting device according to claim 1 , wherein the first urging member urges the detection member and the contact member toward each other.

3. The sheet detecting device according to claim 2 , wherein the contact member and the detection member are configured to be located at the standby position by their own weight.

4. The sheet detecting device according to claim 1 , further comprising a holding member to which the sensor is attached,
wherein the stopper is provided on the holding member.

5. The sheet detecting device according to claim 1 , wherein the sensor detects a sheet in a state in which the detection member is in contact with the stopper.

6. The sheet detecting device according to claim 1 ,
wherein the contact member can be moved from the standby position by being pushed by the sheet, and
wherein the sensor does not detect the sheet in a state in which the contact member is located at the standby position.

7. The sheet detecting device according to claim 1 , wherein the sensor is an optical sensor.

8. An image forming apparatus comprising:
an image forming part configured to form an image on a sheet; and
a sheet detecting device comprising:
a contact member that comes into contact with a conveyed sheet and is rotated;
a detection member configured to be rotatable independently from the contact member, the detection member being a different member from the contact member;
a sensor configured to detect the detection member;
a first urging member configured to act on the detection member and the contact member;
a second urging member configured to act on the contact member such that the contact member and the detection member are located at a standby position;
a positioning part configured to position the contact member urged by the second urging member; and
a stopper with which the detection member comes into contact,
wherein, after the contact member and the detection member are integrally rotated from the standby position as a result of the contact member being pushed by the sheet, the contact member can be further rotated relative to the detection member in a state where the detection member is in contact with the stopper and in a case where the sensor has detected the detection member.

Assignees

• Canon Kk

Inventors

• Koyama Tomooku
• Maeda Naoyuki

Classifications

• B65H2801/06

  Office-type machines, e.g. photocopiers · CPC title

• B65H2553/412

  in barrier arrangements, i.e. emitter facing a receptor element · CPC title

• B65H7/14 Primary

  by photoelectric feelers or detectors · CPC title

• B65H2404/611

  arranged to form a channel · CPC title

• B65H5/062

  between rollers or balls · CPC title