Splicing device for splicing two web materials together, unwinder comprising said splicing device and relative method
First Claim
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1. A splicing device to splice a first web material, coming from a reel being fed, to a second web material, coming from a standing by reel, comprising two heads, each of which comprises:
- a roller associated with a clamping bar to hold between said roller and said clamping bar an initial edge of the second web material;
a counter-pressure member cooperating with said roller to press said first and second web materials against each other;
a cutting member;
wherein said counter-pressure member and said cutting member are carried by a moving unit controlled by an actuator which, through the movement the actuator imparts on said moving unit, causes the first and the second web material to be pinched between said roller and said counter-pressure member, the first web material to be cut by said cutting member and the second web material to be released by a movement of said roller in respect of said clamping bar, the roller being pushed by said counter-pressure member and removed from the clamping bar.
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Abstract
The splicing device comprises two heads (41A, 43A; 41B, 43B), each of which has: a roller (33A; 33B) associated with a clamping bar (93A; 93B) to hold between said roller and said clamping bar an initial edge (L) of the second web material; a counter-pressure member (53A; 53B) cooperating with said roller to press said first and second web materials against each other; and a cutting member (67A; 67B).
15 Citations
26 Claims
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1. A splicing device to splice a first web material, coming from a reel being fed, to a second web material, coming from a standing by reel, comprising two heads, each of which comprises:
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a roller associated with a clamping bar to hold between said roller and said clamping bar an initial edge of the second web material; a counter-pressure member cooperating with said roller to press said first and second web materials against each other; a cutting member; wherein said counter-pressure member and said cutting member are carried by a moving unit controlled by an actuator which, through the movement the actuator imparts on said moving unit, causes the first and the second web material to be pinched between said roller and said counter-pressure member, the first web material to be cut by said cutting member and the second web material to be released by a movement of said roller in respect of said clamping bar, the roller being pushed by said counter-pressure member and removed from the clamping bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 26)
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24. Method for splicing together a first web material and a second web material, comprising:
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providing two splicing heads, each splicing head including;
a roller associated with a clamping bar, a counter-pressure member cooperating with said roller, and a cutting member in a vicinity of said counter-pressure member;arranging a free leading edge of the second web material on the roller of a first one of said two splicing heads, clamping said free leading edge between said roller and the clamping bar corresponding therewith, with a strip of double-sided adhesive material applied to said free leading edge; arranging the counter-pressure member opposite said roller corresponding thereto; wherein, a single actuator provides; a movement to approach and press the counter-pressure member against said roller to pinch between said counter-pressure member and said roller the first web material and the second web material with the strip of double-sided adhesive material between them; a movement of the cutting member to cut the first web material; and a movement of said roller in respect of said clamping bar to release said second web material, the roller being pushed by said counter-pressure member and removed from the clamping bar. - View Dependent Claims (25)
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Specification