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US 5,857,392 AGranted
Cutting device for cutting continuous webs
AssigneeStralfors AB
InventorGothe Anders Krister Parkander
Life of this patent
Estimating the term…
Abstract
The present invention relates to a cutting device for cutting continuous webs, whereby a draw roller (29) with pulling surfaces (42) and a rotating cutting means (33) are rotatable by separate drive units (28 and 32 respectively) so that the speed of rotation of the draw roller (29) and the rotatable cutting means (33) can be varied relative to each other, whereby the relationship between the transport speed of the web and the speed of rotation of the rotatable cutting means (33) can be varied.
Claims22
An apparatus for cutting a continuous web (2/3/73) having a longitudinal edge (20), said apparatus comprising:
- cutting means (33, 33a) for cutting the continuous web (2/3/73) into individual sheets (9);
- at least one rotatably mounted transport means (29) for transporting the continuous web (2/3/73) in a transport direction (7) along a transport path (22) at a transport speed toward said cutting means (33, 33a), said at least one rotatably mounted transport means comprising a draw roller (29),
- said cutting means (33, 33a) comprising at least one rotatable cutting means (33) and a fixed cutting means (33a), said at least one rotatable cutting means (33) rotating about a longitudinal centre line (57) and having at least one cutting edge (59) which extends helically relative to said longitudinal centre line (57), said fixed cutting means (33a) having a straight cutting edge (60),
- said at least one cutting edge (59) and said straight cutting edge (60) defining a shear-type cutting device for cutting the continuous web (2/3/73) into individual sheets (9) along cutting lines (8a, 8b) that extend at a right angle to the longitudinal edge (20) of the continuous web (2/3/73);
- and
- a reading and control device (16) for sensing the position and transport speed of the continuous web (2/3/73) and for controlling said draw roller (29) and said at least one rotatable cutting means (33) based on the sensed position and transport speed of the continuous web (2/3/73),
- said draw roller (29) and said at least one rotatable cutting means (33) being rotatable by separate rotary drive units (28 and 32, respectively) to permit variation of the rotational speed of said draw roller (29) and the rotational speed of said at least one rotatable cutting means (33) relative to each other so that variation between the transport speed of the continuous web (2/3/73) and the rotational speed of the rotatable cutting means (33) relative to one another is possible,
- said at least one rotatable cutting means (33) being operated by a rotary drive unit (32) comprising a motor which is controlled by pulsed control signals (30) from said reading and control device (16).
5 more elements
An apparatus for cutting a continuous web (2/3/73) having a longitudinal edge (20), said apparatus comprising:
- cutting means (33, 33a) for cutting the continuous web (2/3/73) into individual sheets (9);
- at least one rotatably mounted transport means (29) for transporting the continuous web (2/3/73) in a transport direction (7) along a transport path (22) at a transport speed toward said cutting means (33, 33a), said at least one rotatably mounted transport means comprising a draw roller (29)
- said cutting means (33, 33a) comprising at least one rotatable cutting means (33) and a fixed cutting means (33a), said at least one rotatable cutting means (33) rotating about a longitudinal centre line (57) and having at least one cutting edge (59) which extends helically relative to said longitudinal centre line (57), said fixed cutting means (33a) having a straight cutting edge (60),
- said at least one cutting edge (59) and said straight cutting edge (60) defining a shear-type cutting device for cutting the continuous web (2/3/73) into individual sheets (9) along cutting lines (8a, 8b) that extend at a right angle to the longitudinal edge (20) of the continuous web (2/3/73);
- and
- a reading and control device (16) for sensing the position and transport speed of the continuous web (2/3/73) and for controlling said draw roller (29) and said at least one rotatable cutting means (33) based on the sensed position and transport speed of the continuous web (2/3/73),
- said draw roller (29) being capable of transporting a first type (2) of continuous web without edge perforations (31) and a second type (3) of continuous web with edge perforations (31),
- said reading and control device (16) including a first reading means (23) for reading cutting information signs (25) on the first type (2) of continuous web and a second reading means (24) for reading the edge perforations (31) in the second type (3) of continuous web, said second reading means (24) being rotated by the edge perforations (31) in the second type (3) of continuous web.
5 more elements
Dependencies are inferred from the claim text.