Image forming apparatus

• US 10,640,313 B2
• Filed: 04/06/2017
• Issued: 05/05/2020
• Est. Priority Date: 03/13/2014
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sato, Keita
• Primary Examiner(s): Tankersley, Blake A
• Application Number:
  US15/481,321
• Publication Number:
  US 20170210580A1
• Time in Patent Office: Days
• CPC Class Codes: B65H 2801/06 Office-type machines, e.g. photocopiers
• CPC Class Codes: B65H 7/02 by feelers or detectors
• CPC Class Codes: B65H 7/08 responsive to incorrect front register
• CPC Class Codes: B65H 9/002 changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
• CPC Class Codes: G03G 15/6529 Transporting G03G15/6555 takes precedence
• CPC Class Codes: G03G 15/6561 for sheet registration
• CPC Class Codes: G03G 15/6564 with correct timing of sheet feeding
• CPC Class Codes: G03G 2215/00945 Copy material feeding speed varied over the feed path
• CPC Class Codes: G03G 2215/0132 vertical medium transport path at the secondary transfer

Abstract

An image forming apparatus includes a feeding member, a conveying member, and a detecting unit. The feeding member feeds a recording material stacked on a stacking unit. The conveying member convey the fed recording material. The detecting unit detect the conveyed recording material. Where the recording material is a first type, the feeding member feeds the stacked recording material at a first speed, and the conveying member changes the first speed to a second speed that is faster than the first speed before the detecting unit detects the recording material. Where the recording material is a second type that is different from the first type, the feeding member feeds the stacked recording material a third speed that is different from the first speed, and the conveying member changes the third speed to a fourth speed that is different from the third speed after the detecting unit detects the recording material.

Claims

1. An image forming apparatus comprising:

a feeding member configured to feed a recording material stacked on a stacking unit;

a conveying member configured to convey the recording material fed by the feeding member;

a separation member configured to separate a plurality of recording materials so that one recording material is conveyed in a case where the plurality of recording materials is fed from the stacking unit by the feeding member;

a detecting unit disposed on a downstream side of the conveying member in a conveyance direction of the recording material, and configured to detect the recording material;

a controller configured to control the feeding member and the conveying member; and

an image forming unit configured to form an image on the recording material conveyed by the conveying member,

wherein, in a case where the feeding member feeds the recording material, which is one of glossy paper and cardboard, stacked on the stacking unit, the controller controls the feeding member to feed the recording material at a first speed, and the controller controls the conveying member to change a speed of the recording material from the first speed to a second speed that is faster than the first speed at a predetermined timing before the detecting unit detects the recording material, wherein the predetermined timing is a timing when a predetermined time has passed since the controller began controlling the feeding member to feed the recording material stacked on the stacking unit.

2. The image forming apparatus according to claim 1, wherein, when the detecting unit detects the recording material, the controller sets a length of a conveyance time to convey the recording material at the second speed based on a detection timing.

3. The image forming apparatus according to claim 2,

wherein, in a case where the detection timing is a first timing, the controller sets the length of the conveyance time to a length of a first time period, and

wherein, in a case where the detection timing is a second timing that is later than the first timing, the controller sets the length of the conveyance time to a length of a second time period that is longer than the length of the first time period.

4. The image forming apparatus according to claim 3, wherein, at a timing when the conveyance time has passed, the controller controls the conveying member to change the speed of the recording material from the second speed to the first speed.

5. The image forming apparatus according to claim 4,

wherein the image forming unit includes a photosensitive member on which a toner image is to be formed, a primary transfer unit configured to transfer the toner image formed on the photosensitive member to an intermediate transfer member, and a secondary transfer unit configured to transfer the toner image, which was transferred on the intermediate transfer member, to the recording material at a transfer portion,

wherein the first speed is a speed of the recording material when the toner image is transferred to the recording material at the transfer portion, and

wherein the controller sets the length of the conveyance time in such a manner that the toner image having been transferred on the intermediate transfer member is transferred onto the recording material at the transfer portion.

6. The image forming apparatus according to claim 1, wherein, in a case where the feeding member feeds the recording material stacked on the stacking unit, the conveying member conveys the recording material without the recording material being stopped in a section between the feeding member and the detecting unit.

7. The image forming apparatus according to claim 1, wherein the first speed is set based on reducing an occurrence of multi feeding due to a type of recording material.

8. The image forming apparatus according to claim 1, further comprising:

a driving unit configured to drive the feeding member, the conveying member, and the separation member; and

a transmission unit configured to transmit driving force from the driving unit to the feeding member.