IP Library › Granted Patent US 12703192
Granted Patent B2
US 12703192 · App. 18/342,446 · Granted Aug 11, 2026

Printing apparatus

Inventor: Takahiro Kojima (Kanagawa, JP)
Assignee: Canon Kabushiki Kaisha
B41J11/20B41J2/16508B41J2/16585B41J15/165B41J25/304B41J25/308
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Quick Facts
Patent No.
US 12703192
App. No.
18/342,446
Granted
Aug 11, 2026
Kind
B2
Abstract

A printing apparatus includes: a printing head for printing on a printing material; a feeding portion for feeding the printing material from an upstream side of a conveyance path of the printing material toward the printing head; a winding portion for winding a part of the printing material at a downstream side of the conveyance path, the part of the printing material having passed through the printing head; a conveying portion configured to convey the printing material while performing printing on the printing material with the printing head, at a position where the conveying portion is opposed to the printing head; a movement mechanism configured to change an opposing interval between the printing head and the conveying portion; and a detecting portion configured to detect floating of the printing material. The movement mechanism performs a separation operation to widen the opposing interval when the detecting portion detects the floating.

Claims (35)

1 . A printing apparatus comprising:

a printing head configured to perform printing on a printing material from a continuous sheet with a roll shape;

a feeding portion configured to feed the printing material and provided at an upstream side of the printing head with respect to a conveying direction;

a winding portion configured to wind a part of the printing material into a roll shape and provided at a downstream side of the printing head in the conveying direction;

a conveying portion configured to convey the printing material, while the printing head is performing printing on the printing material, and provided at a position where the conveying portion is opposed to the printing head;

a movement mechanism configured to move at least one of the printing head and the conveying portion and change an opposing interval between the printing head and the conveying portion;

a detecting portion configured to detect floating of the printing material at the upstream side of the printing head, and

a control portion configured to control the feeding portion and the winding portion in such a manner that a predetermined tension is applied to the printing material,

wherein the movement mechanism performs a separation operation to widen the opposing interval in a case where the detecting portion detects the floating while the predetermined tension is applied to the printing material, and

wherein after the separation operation, the winding portion stops winding of the printing material.

2 . The printing apparatus according to claim 1 , further comprising a tension detecting portion configured to detect tension of the printing material that is being conveyed,

wherein the detecting portion is disposed between the feeding portion and the winding portion.

3 . The printing apparatus according to claim 1 ,

wherein the control portion performs a conveyance stop operation, the conveyance stop operation being an operation to stop feeding of the printing material by the feeding portion and stop winding of the printing material by the winding portion.

4 . The printing apparatus according to claim 1 ,

wherein, in the conveyance stop operation, the control portion stops the feeding and then stops the winding.

5 . The printing apparatus according to claim 1 ,

wherein the separation operation is an operation to move the conveying portion in a direction away from the printing head.

6 . The printing apparatus according to claim 1 ,

wherein the separation operation is an operation to move the printing head in a direction away from the conveying portion.

7 . The printing apparatus according to claim 1 ,

wherein the separation operation is an operation to move the conveying portion in a direction away from the printing head and move the printing head in a direction away from the conveying portion.

8 . The printing apparatus according to claim 1 , further comprising a meander correcting portion configured to correct a meander of the printing material, the meander correcting portion being disposed between the feeding portion and the printing head in the conveying direction,

wherein the detecting portion is disposed between the meander correcting portion and the printing head in the conveying direction.

9 . The printing apparatus according to claim 1 ,

wherein the detecting portion includes:

a light emitting portion configured to emit detection light above the printing material and along a conveyance path of the printing material; and

a light receiving portion configured to receive the detection light, and

the detecting portion detects the floating by change in amount of light received by the light receiving portion.

10 . The printing apparatus according to claim 1 ,

wherein the conveying portion includes:

a supporting member configured to support the printing material at a position opposed to the printing head; and

a conveyance roller that is rotatably disposed at a position adjacent to the supporting member along a conveyance path of the printing material.

11 . The printing apparatus according to claim 1 ,

wherein the detecting portion includes an ultrasound sensor.