Transverse sheet withdrawal brake

Patent metadata

Field	Value
Publication number	US-9969156-B2
Application number	US-201514872985-A
Country	US
Kind code	B2
Filing date	Oct 1, 2015
Priority date	Oct 1, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method for operating a device that applies a force to a print sheet during a folding operation, wherein the print sheet is in a specified starting position prior to the folding operation. Braking-force triggering pulses are directed toward the print sheet to counter the acceleration of the print sheet in the starting phase of the folding operation and/or to counter fluttering movements that occur during the intake of the print sheet. The pulses exert an intermittent, uniform or oscillating force onto at least a section of the print sheet. The pulses are controlled by a control unit which operates based on control profiles resulting from queried operating parameters and/or based on stored control profiles.

First claim

What is claimed is:

1. A device for making available braking forces that act upon a print sheet during a folding operation, wherein the print sheet is in a specified starting position prior to the folding operation, comprising:
a transverse sheet brake operable during a folding operation to generate braking-force triggering one or more pulses that cause intermittent, uniform or oscillating braking forces that act upon at least a section of the print sheet to counter an acceleration of the print sheet that occurs in a starting phase of the folding operation and/or to counter fluttering movements of the print sheet that form during an intake of the print sheet into the folding operation; and
a control unit to control the braking-force triggering pulses which is operated based on changeable control profiles resulting from queried operating parameters of production data including at least one of a folding pattern, paper weight, paper width and cut-off length and/or by stored control profiles relating to at least one of said parameters.

2. A method for operating the device according to claim 1 to make available braking forces acting upon a print sheet during a folding operation, wherein the print sheet is in a specified position before reaching the folding operation, comprising:
directing braking-force triggering pulses, that are triggered by the transverse sheet brake toward the print sheet to counter at least one of acceleration of the print sheet that occurs during a starting phase of the folding operation and fluttering movements that form during the intake of the print sheet to the folding operation, wherein the pulses are triggered to act intermittently, uniformly or oscillatingly on at least a section of the print sheet; and
controlling the braking-force triggering pulses by the control unit operated with the at least one of changeable control profiles resulting from queried operating parameters and the stored control profiles.

3. The method according to claim 2 , including generating the braking-force triggering pulses pneumatically.

4. The method according to claim 2 , including transmitting at least one of the intermittent, uniform or oscillating braking-force pulses to the print sheet directly, semi-directly or indirectly.

5. The method according to claim 2 , including triggering the braking force pulses mechanically, electronically, hydraulically or pneumatically, and focusing the braking force pulses directly or indirectly onto the print sheet.

6. The method according to claim 2 , wherein the braking-force triggering pulses act upon the print sheet to generate an increase in friction between the print sheet and a table support surface.

7. The device according to claim 1 , wherein the transverse sheet brake is operative to directly, semi-directly or indirectly transfer the intermittent, uniform or oscillating braking forces to the print sheet.

8. The device according claim 1 , further including a table support surface for the print sheet, and the transverse sheet brake is operative to generate braking-force triggering pulses to act upon the print sheet to cause an increase in friction between the print sheet and the table support surface.

9. The device according to claim 1 , wherein the transverse sheet brake is operative to supplement at least one braking force acting upon the print sheet during the intake of the print sheet to the folding operation with an additional braking force which acts upon the back edge of the print sheet or is effective in a region of the back edge.

10. A device for making available a braking force that acts upon a print sheet along a feeding direction to a folding operation and during the folding operation, wherein a print sheet is in a specified starting position prior to a folding operation, comprising:
a braking force generating means operative to generate braking force triggering pulses effective along a feeding direction for the print sheet, applied directly or indirectly to the print sheet to exert intermittent, uniform or oscillating braking forces onto the print sheet, while the print sheet is in an operative connection with the folding operation, to position the print sheet in the specified starting position for the folding operation, wherein the braking force triggering pulses are at least one of pneumatic, mechanical and vacuum generated to cause friction to the print sheet;
a transverse sheet brake operative to generate during the folding operation braking-force triggering pulses that cause intermittent, uniform or oscillating braking forces that act upon at least a section of the print sheet to counter an acceleration of the print sheet that occurs in a starting phase of the folding operation and/or to counter fluttering movements of the print sheet during an intake of the print sheet into the folding operation; and
a control unit to control all the braking-force triggering pulses, the control unit being operated based on at least one of changeable control profiles resulting from queried operating parameters of production data including at least one of a folding pattern, paper weight, paper width and cut-off length and/or by stored control profiles relating to at least one of said parameters.

11. A method for operating a device according to claim 10 to apply braking-forces to the print sheet along the feeding direction to the folding operation and during a folding operation, comprising:
generating pneumatic, mechanical or vacuum generated braking-force triggering pulses that are effective along the feeding direction of the print sheet, and applying the braking-force generated triggering pulse directly or indirectly to the print sheet to exert the intermittent, uniform or oscillating braking-forces to the print sheet to position the print sheet in the specified starting position for the folding operation; and
while the print sheet is subjected to the folding operation, generating braking-force triggering pulses by the transverse sheet brake for causing intermittent, uniform or oscillating braking forces to act on the print sheet to at least one of counter an acceleration of the print sheet that occurs during a starting phase of the folding operation and counter fluttering movements of the print sheet during the folding operation; and
controlling the braking-force triggering pulses by the control unit during the intake of the print sheet which is operated based on the at least one of changeable control profiles resulting from queried operating parameters and the stored control profiles.

12. A method of using the device according to claim 10 , for braking and positioning a print sheet in a feeding direction and for delaying the print sheet during an intake for a folding operation and/or to counter flattering movements that occur during print sheet intake, the method comprising:
computing an air pressure needed for braking based on a specified production data including at least one of a folding pattern, paper weight, paper width and cut-off length, and sending an information regarding the computed pressure to an automatic pressure controller, taking into consideration the print sheet has different values on the left and right side based on a folding pattern;
computing the air pressure required for slowing down the print sheet during intake into the folding station and/or to counter the flattering movements based on specified production data including at least one of the folding pattern, paper weight, paper width and cut-off length, and sending an information regarding the computed air pressure to an automatic pressure controller, taking into consideration that the left and right side of the print sheet have different values, depending on

Assignees

• Mueller Martini Holding Ag

Inventors

• Duss Hanspeter
• Troxler Christian

Classifications

• B65H9/14

  Retarding or controlling the forward movement of articles as they approach stops · CPC title

• B65H45/18 Primary

  Oscillating or reciprocating blade folders (carried on rotary members B65H45/16) · CPC title

• B65H2301/4492

  braking · CPC title

• B65H29/686

  Pneumatic brakes · CPC title

• B41F21/00 Primary

  Devices for conveying sheets through printing apparatus or machines (through platen presses B41F1/28) · CPC title