Rapid tearing device of a strip in a rewinding machine

摘要

A rapid tearing device of a strip in a rewinder for the winding of paper around a core (15) to produce a log (12), where said rewinder has a formation area of the log (12), for moving cores (15) forward into a channel (16) defined by a series of cradles (17) by an upper winding roller (18), the device having a blade (24), having the dimension of the width of the rollers (18, 19, 20), which can be moved by actuators (31, 35; 30, 22, 25) between a rest position and an engagement position on a core (15) when the core (15) is unloaded from said conveyor (13) by means of an introducer (34) and introduced into the channel (16) thus blocking, between core (15) and blade (24), the paper (11) which is being unwound.

主权项

1. A rapid tearing device of a strip in a rewinder for the winding of paper (11) around a core (15) to produce a log (12), wherein said rewinder essentially comprises a formation area of the log (12) upstream of which there is a conveyor (13) with pushers (14) for moving a core (15) forward into a channel (16) defined by a series of cradles (17) integral with the structure of said rewinder, and by an upper winding roller (18) which is situated above the channel (16), wherein the upper winding roller (18) collaborates with a lower winding roller (19) positioned almost at the final end of the cradles (17), whereas an oscillating roller (20) is situated above said lower winding roller (19) and acts as a press with the variation in the dimension of the log (12) being formed between said upper winding roller (18), said lower winding roller (19) and said oscillating roller, said device essentially consisting of a blade (24), having the dimension of the width of the rollers (18, 19, 20) is moved by actuators (31, 35, 30, 22, 25) between a rest position and an engagement position on said core (15) when said core (15) is unloaded from said conveyor (13) by means of a discharge introducer (34) and introduced into the channel (16) thus blocking, between said core (15) and blade (24), the paper (11) which is being unwound in order to tear said paper at a transversal perforation point (37) said blade (24) being positioned on an end of a pair of arms (22) hinged centrally on pins (25), said arms (22) being made to oscillate by means of a cam wheel (31) and a movable coupling feeler having a feeler (30) which move in synchronism with said discharge introducer (34) to discharge said core (15) from said conveyor (13) towards said channel (16).