Automatic splicer for unwinder
First Claim
1. A splicing apparatus for an unwinder which is adapted to unwind a roll of web material and advance the web along a path of web movement from an upstream direction to a downstream direction comprising:
- a first roll support frame for supporting a first roll of web material,a second roll support frame for supporting a second roll of web material,each of the roll support frames being movable from an unwinding position in which a roll on the roll support frame is aligned with said path of web movement and a loading position in which a roll on the support frame is laterally offset from said path,a stationary frame,web supporting means on the stationary frame for supporting a web as the web is advanced along said path,a slitter mounted on the stationary frame upstream of said web supporting means,a web holder movably mounted on each of the roll support frames for movement toward and away from the web supporting means on the stationary frame, each of the web holders being movable to a splicing position in which a web held by the web holder is pressed against a web supported by the web supporting means on the stationary frame.
1 Assignment
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Accused Products
Abstract
A splicing apparatus for an unwinder automatically splices the trailing end of a web from one roll to the leading end of a web from a second roll. A pair of roll support frames are mounted for movement between an unwinding position in which a roll on the support frame is aligned with the path of web movement and a loading position in which a roll on the support frame is laterally offset from the path of web movement. A vacuum retainer is mounted on each of the roll support frames for retaining a leading edge of the web of a new roll. A movable vacuum belt is mounted adjacent the path of web movement, and a slitter is mounted upstream of the vacuum belt. When a first roll in the unwinding position is to be replaced, the first web is secured by the vacuum belt and cut by the slitter to form a trailing end. The roll support frames are moved to bring a second roll into the unwinding position. The leading end portion of the second web is adjacent the trailing end portion of the first web. A ply bonder presses the two webs against the vacuum retainer to bond the webs as the vacuum belt advances the trailing end of the first web.
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Citations
7 Claims
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1. A splicing apparatus for an unwinder which is adapted to unwind a roll of web material and advance the web along a path of web movement from an upstream direction to a downstream direction comprising:
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a first roll support frame for supporting a first roll of web material, a second roll support frame for supporting a second roll of web material, each of the roll support frames being movable from an unwinding position in which a roll on the roll support frame is aligned with said path of web movement and a loading position in which a roll on the support frame is laterally offset from said path, a stationary frame, web supporting means on the stationary frame for supporting a web as the web is advanced along said path, a slitter mounted on the stationary frame upstream of said web supporting means, a web holder movably mounted on each of the roll support frames for movement toward and away from the web supporting means on the stationary frame, each of the web holders being movable to a splicing position in which a web held by the web holder is pressed against a web supported by the web supporting means on the stationary frame. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification