Sheet feeding apparatus and printing apparatus

Patent metadata

Field	Value
Publication number	US-2021237998-A1
Application number	US-202117162121-A
Country	US
Kind code	A1
Filing date	Jan 29, 2021
Priority date	Feb 4, 2020
Publication date	Aug 5, 2021
Grant date	—

Abstract

There is provided a sheet feeding apparatus. A supporting unit rotatably supports a roll sheet formed by winding a continuous sheet into a roll shape. A first conveying path forming member is placed in a position spaced apart from the roll sheet supported by the supporting unit, and forms a first conveying path of the sheet. A displacing unit includes a guide portion capable of being displaced between a guide position and a retracting position set farther from a start position than the guide position. The guide portion is displaced from the retracting position to the guide position when a leading edge of the sheet separated from the roll sheet supported by the supporting unit is positioned between the guide portion in the retracting position and the start position.

First claim

What is claimed is:

1 . A sheet feeding apparatus comprising:
a supporting unit configured to rotatably support a roll sheet formed by winding a continuous sheet into a roll shape; a first conveying path forming member placed in a position spaced apart from the roll sheet supported by the supporting unit, and configured to form a first conveying path of the sheet; and a displacing unit including a guide portion capable of being displaced between a guide position on the side of a start position of the first conveying path, and a retracting position set farther from the start position than the guide position, wherein the guide portion is displaced from the retracting position to the guide position when a leading edge of the sheet separated from the roll sheet supported by the supporting unit is positioned between the guide portion in the retracting position and the start position.

2 . The apparatus according to claim 1 , further comprising a driving unit configured to rotate the roll sheet supported by the supporting unit, thereby feeding the sheet,
wherein the driving unit rotates the roll sheet such that the leading edge separates from the roll sheet between the start position and the guide portion in the retracting position.

3 . The apparatus according to claim 2 , wherein the displacing unit further includes a pivoting portion configured to support the guide portion and pivot around a rotational axis of the roll sheet.

4 . The apparatus according to claim 3 , wherein the guide portion includes a contact portion that comes in contact with the roll sheet.

5 . The apparatus according to claim 4 , wherein the guide portion includes a pressing portion configured to press the contact portion toward an inside of the roll sheet in a radial direction.

6 . The apparatus according to claim 5 , wherein the guide portion includes a second conveying path forming member configured to form a second conveying path between the first conveying path and the roll sheet, when the guide portion is placed in the guide position.

7 . The apparatus according to claim 6 , wherein
the pressing portion is a spring, and the second conveying path forming member includes a fixed portion connected to the pivoting portion, and a flexible portion connected to the fixed portion via the spring and configured to support the contact portion such that the contact portion presses the roll sheet by expansion/contraction of the spring.

8 . The apparatus according to claim 6 , wherein when an initial operation is executed, the driving unit is controlled to rotate the roll sheet such that the leading edge is separated from the roll sheet between the start position and the guide portion in the retracting position.

9 . The apparatus according to claim 8 , further comprising a first detecting unit configured to detect the sheet in a predetermined position between the guide position and the retracting position,
wherein the driving unit stops rotating the roll sheet if the first detecting unit detects the sheet.

10 . The apparatus according to claim 8 , further comprising a second detecting unit configured to detect that the sheet is separated from the roll sheet, in a predetermined position on a downstream side of the guide portion in a rotating direction when feeding the roll sheet,
wherein the driving unit rotates the roll sheet in a direction opposite to the rotating direction of feeding, if the second detecting unit detects that the sheet is separated from the roll sheet.

11 . The apparatus according to claim 2 , wherein
the guide portion comprises a plurality of guide portions spaced apart from each other in a widthwise direction intersecting a feeding direction of the driving unit, and the first conveying path forming member extends between the plurality of guide portions spaced apart from each other.

12 . The apparatus according to claim 1 , wherein the retracting position can be changed in accordance with a type of the sheet.

13 . A printing apparatus comprising:
a sheet feeding apparatus cited in claim 1 ; and a printing unit configured to print an image on a sheet fed from the sheet feeding apparatus.

Assignees

• Canon Kk

Inventors

• Kobayashi Ryo

Classifications

• B65H2301/522

  Threading web into machine · CPC title

• B65H2301/4151

  Starting unwinding process · CPC title

• B65H19/105

  Opening of web rolls; Removing damaged outer layers; Detecting the leading end of a closed web roll · CPC title

• B65H26/06

  responsive to predetermined lengths of webs · CPC title

• B65H16/103 Primary

  in which power is applied to web-roll spindle · CPC title