Apparatus for folding paper sheets
AssigneeGrapha-Holding AG
InventorGeorg Gotting
Life of this patent
Estimating the term…
Abstract
The apparatus has a driven pair of feed rolls (10, 11) and a folding roll (23) which is urged against the lower feed roll (10). The roll pair (10, 11) transports the sheet into a guide element (35, 36) for guiding and arresting the front end of the sheet. The guide element (35, 36) can be another roll pair with a reversible drive (41). After the front end of the sheet has come to a stop, the sheet is transported into the feed nip (22) between the rolls (10, 23), then folded and discharged downwardly. For increasing the operating speed without damaging the sheets, the roll pair (10, 11) is initially accelerated after the sheet is captured, and subsequently decelerated before the front end of the sheet comes to a stop.
Claims8
An apparatus for folding paper sheets (18), comprising
- a means for feeding said sheets at a feed velocity (v.sub.0);
- a first feed roll (10) for receiving said sheets from said feeding means having a circumferential velocity (v) and being driven by a first drive (14);
- a second feed roll (11) urged against the first feed roll (10);
- at least one guide element (19, 20;
- 35, 36) for guiding and arresting a front end of a sheet (21), and a folding roll (23) urged against the first feed roll (10);
- a means for controlling said first drive (14) such that after capturing the front end of the sheet (21), the circumferential velocity (v) of the first and the second feed roll (10, 11) is initially accelerated to a value greater than the feed velocity (v.sub.0) of the sheets (18) and is subsequently decelerated, before the front end of the sheet (21) comes to a stop, to a value smaller than the feed velocity (v.sub.0).
A printing machine including an apparatus for folding paper sheets (18), comprising
- a means for feeding said sheets at a feed velocity (v.sub.0);
- a first feed roll (10) for receiving said sheets from said feeding means having a circumferential velocity (v) and being driven by a first drive (14);
- a second feed roll (11) urged against the first feed roll (10);
- at least one guide element (19, 20;
- 35, 36) for guiding and arresting a front end of a sheet (21), and a folding roll (23) urged against the first feed roll (10);
- a means for controlling said first drive (14) such that after capturing the front end of the sheet (21), the circumferential velocity (v) of the first and the second feed roll (10, 11) is initially accelerated to a value greater than the feed velocity (v.sub.0) of the sheets (18) and is subsequently decelerated, before the front end of the sheet (21) comes to a stop, to a value smaller than the feed velocity (v.sub.0).
Dependencies are inferred from the claim text.