Method and apparatus for accelerating a roll to a target

• US 9,540,201 B2
• Filed: 12/06/2012
• Issued: 01/10/2017
• Est. Priority Date: 12/07/2011
• Status: Active Grant

• Current Assignee: Abb Oy (ABB Limited)
• Original Assignee: Abb Oy (ABB Limited)
• Inventors: Talvitie, Tapio
• Primary Examiner(s): RIVERA, WILLIAM ARAUZ
• Application Number:
  US13/706,373
• Publication Number:
  US 20130146701A1
• Time in Patent Office: 1,496 Days
• Field of Search: 242/554, 242/554.1, 242/554.2, 242/554.6, 242/555, 242/555.3, 242/555.4
• US Class Current: 1/1
• CPC Class Codes: B65H 19/1821 the replacement web being accelerated or running prior to splicing contact
• CPC Class Codes: B65H 2220/01 indicating an entity as a function of which control, adjustment or change is performed, i.e. input
• CPC Class Codes: B65H 2220/02 indicating an entity which is controlled, adjusted or changed by a control process, i.e. output
• CPC Class Codes: B65H 2511/212 Rotary position
• CPC Class Codes: B65H 2511/51 Presence
• CPC Class Codes: B65H 2511/512 Marks, e.g. invisible to the human eye; Patterns
• CPC Class Codes: B65H 2513/20 Acceleration or deceleration

Abstract

Method and apparatus of splicing a paper web, in which a paper web from a new reel is spliced to a paper web from an emptying reel and a position of glue or two sided tape in the surface of the new paper reel is marked. The method includes receiving a command for splicing, determining the splicing time instant, accelerating a rotation of the new paper reel, detecting the glue or tape, controlling, based on the detected glue or tape, the rotation of the new paper reel in such a manner that the rotation speed of the new paper reel and the position of the glue or tape are as required at the splicing time instant, and splicing the paper web at the splicing time instant.

Claims

1. A method of splicing a paper web, in which a paper web from a new reel is spliced to a paper web from an emptying reel and a position of glue or two sided tape in a surface of the new paper reel is marked, the method comprising:

receiving a command for splicing;

determining a splicing time instant;

accelerating a rotation of the new paper reel;

detecting the glue or tape;

controlling, based on the detected glue or tape, the rotation of the new paper reel in such a manner that a rotation speed of the new paper reel is such that a surface speed of the new paper reel corresponds to a travel speed of the paper web and the position of the glue or tape is such that the splicing is done at the splicing time instant; and

splicing the paper web at the splicing time instant.

2. The method according to claim 1, wherein the accelerating of the rotation of the new paper reel comprises:

accelerating the new paper reel using a pre-defined acceleration profile, which comprises linearly increasing acceleration, constant acceleration and linearly decreasing acceleration.

3. The method according to claim 2, comprising:

detecting the glue or tape for the first time during the linearly increasing acceleration, and after the detection, calculating a correction period (tx);

leaving the acceleration to the value at the time instant of the detection for the correction period (tx); and

after the correction period, accelerating the new paper reel with linearly increasing acceleration until a pre-defined acceleration (a) is reached.

4. The method according to claim 3, comprising after the pre-defined acceleration (a) is reached:

accelerating the new paper reel with the constant acceleration (a); and

accelerating the new paper reel with linearly decreasing acceleration until the acceleration ramps to zero.

5. The method according to claim 4, comprising:

detecting the glue or two-sided tape during each rotation of the new paper reel;

calculating an actual distance the surface of the new paper reel has travelled during the acceleration;

calculating a distance the surface of the new paper reel should have travelled according to the pre-defined acceleration profile;

calculating an error between the calculated distances; and

changing a time instant of a start of the linearly decreasing acceleration and a slope of the linearly decreasing acceleration on the basis of the calculated error in distances.

6. The method according to claim 5, wherein the changing the time instant of the start of the linearly decreasing acceleration comprises:

changing the linearly decreasing acceleration in such a way that speed gained during the decreasing acceleration is the same as with a pre-defined slope of the decreasing acceleration.

7. The method according to claim 1, wherein after the linearly decreasing acceleration the method comprises:

rotating the new paper reel with a constant speed until the splicing time instant.