EP 1047532 A1 20001102 - SELECTABLE PHASE CROSS-WEB PERFORATOR
Title (en)
SELECTABLE PHASE CROSS-WEB PERFORATOR
Title (de)
VORRICHTUNG ZUM QUERPERFORIEREN MIT WÄHLBARER PHASENSTELLUNG
Title (fr)
ENSEMBLE DE PERFORATION SELECTIVE D'UNE BANDE DE PAPIER
Publication
Application
Priority
- US 9716077 W 19970911
- US 71495696 A 19960917
Abstract (en)
[origin: WO9812027A1] A perforation assembly (55) has a backup roller (56) placed on one side of a web (W) and a perf knife (65) rotatably held on the opposite side. The backup roller (56) runs at a constant surface speed substantially matched to that of the web (W) which is tensioned around the roller (56) and supported thereon. A servo motor (5) rotates the perf knife into engagement with the web (W) and with the backup roller (56), which then carries the knife (65) past a nip, perforating the web (W) without loss of speed during the perforation impact. The perf knife (65) rotates out of engagement with the web (W) and continues to accelerate up to a sensor (68) which triggers application of a braking torque by the servo motor (5), bringing it to rest at a home position. The backup roller (56) thus serves as an energy-storage mechanism which engages and maintains the perf knife (65) at the web speed once the perf knife (65) has been moved to the engagement point adjacent the nip region. Because the perf knife (65) is passively synchronized by contact with the backup roller (56), the backup roller (56) and perf knife (65) may rotate on different circumferential diameters without the high inertia of a mechanically coupled gear train. The inertia of the perf knife (65) holder is significantly reduced, allowing a simple servo (5) to quickly move the perf blade (65) to engage with a short response time, to recycle to home position with a relatively quick recovery time, and to be actuated in arbitrary phase relation to the rotation of the backup roller (56) at arbitrarily selected times as the web (W) passes adjacent thereto. A preferred system is an electrographic print system, wherein electronic printer drive signals provide timing synchronization for actuating the knife (65) to form perforations in the printed web (W). Position sensors (68, 69) synchronize the motor braking and locking power cycles, allowing fast response and high accuracy perforation of webs moving at one hundred feet per minute or more.
IPC 1-7
IPC 8 full level
B26D 1/40 (2006.01); B26D 1/62 (2006.01); B26D 5/20 (2006.01); B26D 5/32 (2006.01); B26D 7/06 (2006.01); B26F 1/20 (2006.01); B65H 35/08 (2006.01)
CPC (source: EP)
B26D 1/405 (2013.01); B26D 1/626 (2013.01); B26D 5/20 (2013.01); B26D 5/32 (2013.01); B26F 1/20 (2013.01)
Citation (search report)
See references of WO 9812027A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9812027 A1 19980326; AU 4267497 A 19980414; EP 1047532 A1 20001102; JP 2001500799 A 20010123
DOCDB simple family (application)
US 9716077 W 19970911; AU 4267497 A 19970911; EP 97941031 A 19970911; JP 51474298 A 19970911