Sheet supply device and sheet supply method

Patent metadata

Field	Value
Publication number	US-11390480-B2
Application number	US-201816767041-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Nov 30, 2017
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A conveyance device is capable of preventing a remaining portion of a cut sheet from being caught in a conveyance path. A sheet supply device includes an urging mechanism capable of switching between a supply state of applying force in a direction away from a pressing position to an upstream part, in a conveyance direction, of a cut position of a sheet of a supply side roll, the cut position being cut by a cutter, and a stopped state of stopping application of the force, and a controller configured to switch the urging mechanism from the stopped state to the supply state in accordance with a timing when the sheet is cut by the cutter.

First claim

The invention claimed is:

1. A sheet supply device for supplying a sheet from a first roll and a second roll around which the sheet is wound, the sheet supply device comprising:
a first support shaft configured to support the first roll at a center position thereof;
a second support shaft configured to support the second roll at a center position thereof;
a joining mechanism configured to join the sheet of the second roll to the sheet of the first roll when a remaining quantity of the sheet of the first roll is equal to or less than a preset remaining quantity in a state in which the sheet of the first roll is supplied;
an urging mechanism; and
a controller,
wherein the joining mechanism includes:
a pressing roller configured to press the sheet of the first roll against a preset pressing position on an outer peripheral surface of the second roll;
a moving unit configured support the pressing roller such that the pressing roller is configured to approach and move away from the outer peripheral surface of the second roll between a forward position pressed against the preset pressing position and a retracted position away from the preset pressing position;
a guide roller that is attached to the moving unit and configured to guide, to the preset pressing position, the sheet of the first roll on an upstream part of the preset pressing position in a conveyance direction of the sheet of the first roll in a state in which the pressing roller is pressed against the preset pressing position; and
a cutter configured to cut a portion of the sheet of the first roll between the guide roller and the pressing roller in a state in which the pressing roller, in a direction orthogonal to the conveyance direction of the sheet of the first roll, is pressed against the preset pressing position, and

wherein the urging mechanism can be switched between a supply state in which a force in a direction away from the preset pressing position is applied to an upstream part, in the conveyance direction, of a cut position of the sheet of the first roll by the cutter and a stopped state in which application of the force is stopped, and the controller is configured to switch the urging mechanism from the stopped state to the supply state in accordance with a timing when the sheet is cut by the cutter.

2. The sheet supply device according to claim 1 , wherein the controller is configured to control the urging mechanism to be in the supply state during a period from before a predetermined time of the timing when the sheet is cut by the cutter to after a lapse of the predetermined time.

3. The sheet supply device according to claim 2 , wherein the urging mechanism is configured to apply a force in a direction away from the guide roller to the upstream part, in the conveyance direction, of the guide roller on the sheet of the first roll.

4. The sheet supply device according to claim 3 , wherein a distance from a portion of the sheet to which the force is applied from the urging mechanism to the guide roller is smaller than a distance from the guide roller to the cut position of the sheet of the first roll by the cutter.

5. The sheet supply device according to claim 4 , wherein:
the guide roller is disposed below the pressing roller such that a downstream part is bent upward with respect to the upstream part, in the conveyance direction, of the guide roller in a conveyance path of the sheet of the first roll; and
the urging mechanism is configured to apply a downward force to the sheet of the first roll.

6. The sheet supply device according to claim 3 , wherein:
the guide roller is disposed below the pressing roller such that a downstream part is bent upward with respect to the upstream part, in the conveyance direction, of the guide roller in a conveyance path of the sheet of the first roll; and
the urging mechanism is configured to apply a downward force to the sheet of the first roll.

7. A sheet supply method for supplying a sheet from a first roll and a second roll around which the sheet is wound, the sheet supply method comprising:
a first supply step of supplying the sheet of the first roll supported at a center position by a first support shaft; and
a joining step of joining the sheet of the second roll to the sheet of the first roll using a joining mechanism that joins the sheet of the second roll to the sheet of the first roll when a remaining quantity of the sheet of the first roll is equal to or less than a preset remaining quantity in a state in which the sheet of the first roll is supplied, and cutting the sheet of the first roll,
wherein the joining mechanism includes:
a pressing roller that presses the sheet of the first roll against a preset pressing position on an outer peripheral surface of the second roll;
a moving unit that supports the pressing roller such that the pressing roller is configured to approach and move away from the outer peripheral surface of the second roll between a forward position pressed against the preset pressing position and a non-pressing position away from the preset pressing position;
a guide roller that is attached to the moving unit; and
a cutter that cuts a portion of the sheet of the first roll between the guide roller and the pressing roller in a state in which the pressing roller is pressed against the preset pressing position, and

wherein:
an urging mechanism supplies a force in a direction away from the preset pressing position to an upstream part, in a conveyance direction, of a cut position of the sheet of the first roll by the cutter; and
in the joining step, the sheet of the first roll on an upstream part of the preset pressing position in the conveyance direction is guided to the preset pressing position by the guide roller while the pressing roller is pressed against the preset pressing position by moving the moving unit in a direction approaching the second roll, and a force in a direction away from the preset pressing position is applied by the urging mechanism to the upstream part, in the conveyance direction, of the cut position of the sheet of the first roll by the cutter in accordance with a timing when the sheet is cut by the cutter.

Assignees

• Zuiko Corp

Inventors

• Tsujimoto Yoshiaki
• Fujita Hideki

Classifications

• B65H19/1815 Primary

  the replacement web being stationary prior to splicing contact · CPC title

• B65H19/1868

  The roll support being of the turret type · CPC title

• B65H2513/10

  Speed · CPC title

• B65H19/1821 Primary

  the replacement web being accelerated or running prior to splicing contact · CPC title

• B65H19/20

  Cutting-off the expiring web · CPC title