Printing apparatus and control method

Patent metadata

Field	Value
Publication number	US-9327528-B2
Application number	US-201414326497-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Jul 16, 2013
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A printing apparatus according to the present invention includes a printing unit, a conveying unit, a driving source driving the conveying unit, a feeding unit, a discharging unit, a control unit, a switching mechanism switching a driving state of the feeding unit and a restricting mechanism restricting backward feeding of the discharging unit. The control unit changes a timing of feeding the subsequent printing medium in accordance with a printing start position of the subsequent printing medium.

First claim

What is claimed is:

1. A printing apparatus comprising:
a printing unit configured to perform a printing operation of printing an image on a printing medium;
a conveying unit arranged upstream of said printing unit in a conveyance direction of a printing medium, and configured to convey a printing medium;
a driving source configured to drive said conveying unit, said conveying unit conveying a printing medium in the conveyance direction when said driving source rotates in a first direction, and said conveying unit conveying a printing medium in a direction opposite to the conveyance direction when said driving source rotates in a second direction;
a feeding unit arranged upstream of said conveying unit in the conveyance direction and configured to perform a feeding operation for a printing medium by transmission of a driving of said driving source, the driving of said driving source not transmitted to said feeding unit when said driving source rotates in the first direction, and the driving of said driving source transmitted to said feeding unit when said driving source rotates in the second direction;
a discharging unit arranged downstream of said printing unit in the conveyance direction and configured to perform a discharging operation for a printing medium by transmission of the driving of said driving source, the driving of said driving source being transmitted to said discharging unit when said driving source rotates in the first direction, and the driving of said driving source not transmitted to said discharging unit when said driving source rotates in the second direction; and
a control unit configured to perform a control in which:
after the printing operation for a first printing medium is completed, the first printing medium is conveyed by a conveyance amount by the driving source rotating in the first direction, the conveyance amount being calculated based on a printing start position on a second printing medium which is subsequent to the first printing medium, and
after the first printing medium is conveyed by the conveyance amount, the feeding operation for the second printing medium is started by changing a rotation direction of said driving source from the first direction to the second direction before the discharging operation for the first printing medium is completed.

2. The apparatus according to claim 1 , further comprising a detection unit configured to detect passage of a trailing end of a printing medium,
wherein a detection position of said detection unit is a position upstream of said conveying unit in the conveyance direction and downstream of said feeding unit in the conveyance direction, and
said control unit is configured to set a feeding start timing of the second printing medium based on a detection result of said detection unit regarding the first printing medium, and the printing start position on the second printing medium.

3. The apparatus according to claim 1 , wherein
said conveying unit includes a conveying roller, and
the conveying roller rotates so as to convey a printing medium in a direction opposite the conveyance direction when said driving source rotates in the second direction.

4. The apparatus according to claim 1 , wherein
said conveying unit includes a conveying roller,
said feeding unit includes a feeding roller,
said discharging unit includes a discharging roller,
said driving source includes a motor,
the rotational direction of the conveying roller is switched by rotation of the motor, and
said apparatus further includes:
a planet gear arranged in a transmission path of a driving force from the motor to the feeding roller; and
a planet gear arranged in a transmission path of a driving force from the motor to the discharging roller.

5. The apparatus according to claim 1 , wherein
said control unit is configured to perform a control in which after said feeding unit starts the feeding operation for a printing medium, the printing medium abuts against said conveying unit which is under an operation state to convey a printing medium in the direction opposite to the conveyance direction.

6. A printing apparatus comprising:
a printing unit configured to perform a printing operation of printing an image on a printing medium;
a conveying roller arranged upstream of said printing unit in a conveyance direction of a printing medium, and configured to convey a printing medium;
a driving source configured to drive said conveying roller, said conveying roller conveying a printing medium in the conveyance direction when said driving source rotates in a first direction, and said conveying roller conveying a printing medium in a direction opposite to the conveyance direction when said driving source rotates in a second direction;
a feeding roller arranged upstream of said conveying roller in the conveyance direction and configured to perform a feeding operation for a printing medium by transmission of a driving of said driving source, the driving of said driving source not transmitted to said feeding roller when said driving source rotates in the first direction, and the driving of said driving source transmitted to said feeding roller when said driving source rotates in the second direction;
a discharging roller arranged downstream of said printing unit in the conveyance direction and configured to perform a discharging operation for a printing medium by transmission of the driving of said driving source, the driving of said driving source transmitted to said discharging roller when said driving source rotates in the first direction, and the driving of said driving source not transmitted to said discharging roller when said driving source rotates in the second direction; and
a control unit configured to perform a control in which:
after the printing operation for a first printing medium is completed, the first printing medium is conveyed by a conveyance amount by the driving source rotating in the first direction, the conveyance amount being calculated based on a printing start position on a second printing medium which is subsequent to the first printing medium; and
after the first printing medium is conveyed by the conveyance amount, the feeding operation for the second printing medium is started by changing a rotation direction of said driving source from the first direction to the second direction before the discharging operation for the first printing medium is completed.

7. The apparatus according to claim 6 , further comprising a detection unit configured to detect passage of a trailing end of a printing medium,
wherein a detection position of said detection unit is a position upstream of said conveying roller in the conveyance direction and downstream of said feeding roller in the conveyance direction, and
said control unit is configured to set a feeding start timing of the second printing medium based on a detection result of said detection unit regarding the first printing medium, and the printing start position on the second printing medium.

8. The apparatus according to claim 6 , wherein
said driving source includes a motor, and
said apparatus further includes:
a planet gear arranged in a transmission path of a driving force from the motor to said feeding roller; and
a planet gear arranged in a transmission path of a driving force from the motor to said discharging roller.

9. The apparatus according to claim 6 , wherein
said control unit is configured to perform a control in which after said feeding roller starts the feeding operation for a printing medium, the printing medium abuts against said conveying roller which is under an operation state to convey a printing medium in the direction opposite to the conveyance direction.

Assignees

• Canon Kk

Inventors

• Hakamata Keisei

Classifications

• B41J13/0018

  in the sheet input section of automatic paper handling systems · CPC title

• B41J13/0009 Primary

  control of the transport of the copy material · CPC title

• B41J23/025

  using a single or common power source for two or more functions · CPC title