Automatic web transfer mechanism for flexible sheet dispenser
First Claim
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1. A method for sequentially dispensing flexible sheet material from a primary web roll and a secondary web roll, said method comprising the steps of:
- passing a primary web from the primary web roll through a feed nip defined as a contact plane between a pair of feed rollers and dispensing the primary web therethrough;
moving one of the feed rollers with respect to the other feed roller upon passage of a trailing edge of the primary web from the feed nip;
following said moving step, introducing a leading edge from the secondary web roll into the feed nip;
thereafter, dispensing the secondary web through the feed nip.
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Abstract
A dispenser for sequentially dispensing web material from a primary web roll and then a reserve web roll. The dispenser senses the presence of the primary web directly at the feed nip defined by two feed rollers and introduces the leading edge of the reserve web roll to the feed nip immediately after the trailing end of the primary web roll passes through the feed nip. The movement of one feed roller relative to the other feed roller actuates the transfer mechanism which introduces the reserve web to the feed nip.
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Citations
33 Claims
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1. A method for sequentially dispensing flexible sheet material from a primary web roll and a secondary web roll, said method comprising the steps of:
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passing a primary web from the primary web roll through a feed nip defined as a contact plane between a pair of feed rollers and dispensing the primary web therethrough; moving one of the feed rollers with respect to the other feed roller upon passage of a trailing edge of the primary web from the feed nip; following said moving step, introducing a leading edge from the secondary web roll into the feed nip; thereafter, dispensing the secondary web through the feed nip. - View Dependent Claims (2, 3, 4, 12, 13, 14, 15, 16, 17, 18)
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5. A method for sequentially dispensing flexible sheet material from a primary web roll and a reserve web roll, said method comprising the steps of:
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passing a primary web from the primary web roll through a feed nip defined as a contact plane between a pair of feed rollers; determining directly at the feed nip when a trailing edge of the primary web passes intermediately between the feed rollers at the feed nip; following said determining step, introducing a leading edge of the reserve web from the reserve web roll into the feed nip; thereafter, passing the reserve web through the feed nip defined between the pair of feed rollers.
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6. A dispenser for flexible sheet material, comprising:
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a chassis having a rear wall, a front cover and an opening through which the flexible sheet material is dispensed; support means for supporting a primary roll of flexible sheet material and a reserve roll of flexible sheet material within said chassis; feed and sensing means for defining a feed nip for dispensing therethrough a web of sheet material from one of the primary roll and the reserve roll supported by said support means and for sensing the presence of a primary web of material from the primary roll dispensing through said feed nip; position means for positioning a leading edge of a reserve web of material from the reserve roll and preventing the reserve web from entering said feed nip while the primary web of material is dispensing therefrom; and transfer means for transferring the leading edge of the reserve web of material to said feed nip in response to said feed and sensing means sensing the absence of the primary web at said feed nip such that dispensing of said reserve web commences. - View Dependent Claims (7, 8, 9, 10, 11)
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19. A dispenser for flexible sheet material, comprising:
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a chassis defining at least in part a primary roll area for a primary web roll and a reserve roll area for a reserve web roll having a reserve web leading edge; a pair of feed rollers defining a nip as the contact area therebetween and positioned such that the web of the primary roll in the primary roll area is feedable therethrough; detectors disposed about the peripheries of both said feed rollers and positioned to detect directly at said nip the depletion of the primary roll web; and a transferring mechanism which transfers the reserve web leading edge to said feed nip in response to said detectors detecting the depletion of the primary roll web at said feed nip. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A dispenser for flexible sheet material, comprising:
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a chassis defining at least in part a primary roll area for a primary web roll and a reserve roll area for a reserve web roll having a reserve web leading edge; a pair of feed rollers defining a feed nip area positioned such that the web of the primary roll in the primary roll area is feedable therethrough; said feed rollers positioned to detect the depletion of the primary web roll directly at said feed nip; one of said feed rollers being movable relative to the other said feed roller in response to said feed rollers detecting the depletion of the primary roll web; means responsive to the movement of said one feed roller relative to said other feed roller to cause the reserve web leading edge to be inserted into said nip. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A dispenser for flexible sheet material, comprising:
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a chassis defining at least in part a primary roll area for a primary web roll and a reserve roll area for a reserve web roll having a reserve web leading edge; a pair of feed rollers defining a nip as the contact area therebetween and positioned such that the web of the primary roll in the primary roll area is feedable therethrough; sensing means for sensing directly at said feed nip and immediately between said feed rollers the presence of the primary roll web; transferring means for transferring said reserve web leading edge into said feed nip in response to said sensing means sensing the absence of the primary roll web at said feed nip. - View Dependent Claims (32, 33)
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Specification