US 12,134,536 B2
Rotary frame construction for web transport control devices
Ulrich Prims, Bielefeld (DE); Robin Lorenz, Herford (DE); and Jörgen Schumacher, Herford (DE)
Assigned to BST GmbH, Bielefeld (DE)
Filed by BST GmbH, Bielefeld (DE)
Filed on Jan. 10, 2022, as Appl. No. 17/572,096.
Claims priority of application No. 21151274 (EP), filed on Jan. 13, 2021.
Prior Publication US 2022/0219928 A1, Jul. 14, 2022
Int. Cl. B65H 23/038 (2006.01); B65H 23/035 (2006.01)
CPC B65H 23/038 (2013.01) [B65H 23/035 (2013.01); B65H 2301/31124 (2013.01); B65H 2404/15212 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A rotary frame construction for web transport control devices, comprising:
a carrier frame,
a rotary frame which extends in parallel with the carrier frame and carries an input roller and an output roller for a web to be controlled, the rotary frame being pivotably mounted on the carrier frame by a bearing having a virtual rotation center that is defined by control surfaces of one of the carrier frame and the rotary frame,
cam followers on the other of the frames for riding along the control surfaces,
support rollers on one of the frames and associated run surfaces on the other frame for holding the frames in parallel alignment,
a drive system, with the frames being connected with one another so as to be pivotable by means of the drive system,
wherein the control surfaces are constituted by three control curves that are formed at outer edges of a cam plate that is rigidly held on one of the frames, with two of the control curves being located on one side of the cam plate and the third on an opposite side of the cam plate, and
wherein the other of the frames has three said cam followers that are respectively associated with one of the control curves.