Stencil printing machine and a wrinkle preventing method on a stencil sheet of the stencil printing machine

• US 6,382,097 B2
• Filed: 03/02/2001
• Issued: 05/07/2002
• Est. Priority Date: 03/02/2000
• Status: Expired due to Fees

• Current Assignee: RISO Kagaku Corporation
• Original Assignee: RISO Kagaku Corporation
• Inventors: Kinoshita, Hideyuki, Oshima, Kenji, Yoshida, Kenji, Watanabe, Hiroshi
• Primary Examiner(s): Yan, Ren
• Application Number:
  US09/796,793
• Publication Number:
  US 20010020422A1
• Time in Patent Office: 431 Days
• Field of Search: 101/114, 101/116, 101/119, 101/120, 101/129, 101/425, 101/477
• US Class Current: 101/129
• CPC Class Codes: B41L 13/06 with a single cylinder carrying the stencil

Abstract

An ink supplying roller (17) is disposed in a rotary cylindrical drum (16), and is moved so that the ink supplying roller (17) can be brought into contact with an inner peripheral surface of a cylindrical circumferential wall (15). The ink supplying roller (17) is placed at a contact position with an ink permeable portion (15a) of the circumferential wall (15). The rotary cylindrical drum (16) is rotated in a state in which a stencil sheet (M) is not wound around the rotary cylindrical drum (16). Therefore, ink (50) drawn out through the ink permeable portion to the outer peripheral surface of the circumferential wall (15) because the stencil sheet (M) is peeled off at the stencil discharging operation is pulled into the ink permeable portion of the circumferential wall (15) by negative pressure produced by the ink supplying roller (17) coming in contact with the inner peripheral surface of the circumferential wall (15) and is removed.

Claims

1. A wrinkle preventing method for preventing a wrinkle on a stencil sheet, the method comprising the steps of:

providing a stencil printing machine which includes;

a rotary cylindrical drum rotatable about its own axis, the rotary cylindrical drum including an ink-permeable cylindrical circumferential wall having an outer peripheral surface around which a stencil sheet subjected to a stencil making process can be wound;

a contact member capable of contacting with an inner peripheral surface of the circumferential wall, the contact member being disposed in the rotary cylindrical drum; and

a move mechanism capable of moving the contract member to a contact position at which the contact member is brought into contact with the inner peripheral surface of the circumferential wall or a distance position at which the contact member is spaced with a predetermined interval from the inner peripheral surface of the circumferential wall;

discharging the stencil sheet from the rotary cylindrical drum so that the rotary cylindrical drum is placed in a state in which the stencil sheet is not wound around the circumferential wall of the rotary cylindrical drum;

rotating the rotary cylindrical drum while placing the contact member at the contact position relative to an ink permeable portion of the circumferential wall;

placing the contact member at the distance position relative to the ink permeable portion of the circumferential wall; and

winding, around the outer peripheral surface of the circumferential wall of the rotary cylindrical drum, a stencil sheet subjected to the stencil making process.

2. A stencil printing machine, comprising:

a rotary cylindrical drum rotatable about its own axis, the rotary cylindrical drum including an ink-permeable cylindrical circumferential wall having an outer peripheral surface around which a stencil sheet subjected to a stencil making process can be wound;

a contact member capable of contacting with an inner peripheral surface of the circumferential wall, the contact member being disposed in the rotary cylindrical drum; and

a move mechanism capable of moving the contract member to a contact position at which the contact member is brought into contact with the inner peripheral surface of the circumferential wall or a distance position at which the contact member is spaced with a predetermined interval from the inner peripheral surface of the circumferential wall,

wherein when the stencil sheet is not wound around the circumferential wall of the rotary cylindrical drum, the rotary cylindrical drum is rotated while the contact member is placed at the contact position relative to an ink permeable portion of the circumferential wall.

3. The stencil printing machine of claim 2, wherein the contact member includes an ink supplying roller which supplies ink to the inner peripheral surface of the circumferential wall.