Method and apparatus for splicing web
First Claim
1. A web splicing method for splicing a trailing end of an old web which is being unwound from an old roll and a leading end of a new web which starts to be unwound from a new roll, wherein:
- holding means for holding the old web is provided at an upstream side of a splicing position of the webs; and
said holding means positions the old web so as to guide the trailing end of the old web separating from the old roll to the splicing position.
2 Assignments
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Accused Products
Abstract
A web holding unit is provided just in front of a cutting and splicing unit. The holding unit is comprised mainly of multiple pass rollers, a pass roller motor, a vacuum pump, and an up/down cylinder. As the unwinding of an old web comes to an end, a rod of the up/down cylinder extends, and the pass rollers of the holding unit abut against the old web. The pass roller rotates at lower speed than web transport speed, and during the transport, the old web is drawn onto the pass rollers by sucking of the pump. The old web is transported to the cutting and splicing unit with a position thereof being regulated by the holding means.
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Citations
8 Claims
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1. A web splicing method for splicing a trailing end of an old web which is being unwound from an old roll and a leading end of a new web which starts to be unwound from a new roll, wherein:
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holding means for holding the old web is provided at an upstream side of a splicing position of the webs; and said holding means positions the old web so as to guide the trailing end of the old web separating from the old roll to the splicing position.
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2. A web splicing apparatus for splicing a trailing end of an old web which is being unwound from an old roll and a leading end of a new web which starts to be unwound from a new roll, said apparatus comprising:
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turret means for pivotally supporting the old roll and the new roll; splicing means for splicing the trailing end of the old web and the leading end of the new web; and holding means for holding and positioning the old web so as to guide the trailing end of the old web separating from the old roll to said splicing means, said holding means provided at an upstream side of said splicing means. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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Specification