Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1991-10-01
1993-09-14
Stodola, Daniel P.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 1602
Patent
active
052441610
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for paying out web sections, especially paper towels from a dispenser roll, comprising automatic changeover of the dispensing to a supply roll upon exhaustion of the dispenser roll, wherein a feeler in contact under spring loading with the web of material of the dispenser roll detects the presence of the web of material of the dispenser roll and, in case of absence thereof, presses the end of the web of material of the dispenser roll by way of a lever structure against the beginning of the web of material of the supply roll and feeds both webs of material in common to a contact pressure roller and the counter-roller in engagement with the same.
Sheet dispensers working from a roll are known in great number. The most significant ones, apart from dispensers of cleaning rags and cloths, have become dispensers of towels. For this reason the invention will be discussed below with reference to the example of a towel dispenser without, however, restricting it thereto.
Towel dispensers which are equipped with a supply roll and with which this extra roll is resorted to when the paper supply on the first roll is exhausted are known from U.S. Pat. No. 4,236,679, EP-OS 319 166, EP-OS 235 446, and DE-OS 28 12 756. According to U.S. Pat. No. 4,236,679 it is suggested to arrange the material rollers above each other on hingedly suspended supporting levers, whereby they are in contact with each other, and to support the lower roller on a transport roll. Upon exhaustion of the lower web of material roll the supporting levers swing back and the roll in reserve takes the place of the first dispenser roll. It is not assured in this case that the beginning of the web of the extra roll actually will exit downwardly from the dispenser.
EP-OS 319 166 provides for dispensing web material by means of a slide surface actuated by a rack, the material of the first roll being wrapped around the slide surface and leads to the removal opening. At the same time, the leading end of the web of the second roll is placed on the slide surface and pressed against the transport roll by a contact pressure plate. The contact pressure plate includes detents by which the leading and of the second paper roll is held. When the first paper roll is unwound the frictional resistance between the beginning of the web of the second paper roll and the transport roll is increased due to the greater friction of the transport roll, whereby the paper is pulled across the detents and gets to the exit opening. In view of the fact that the friction may vary considerably, depending upon the type of paper inserted, it cannot be warranted that paper is not withdrawn already from the second roll, too, while there still is paper to be dispensed from the first roll. Thus it may well happen that two sheets are paid out, i.e. that the consumption of paper is doubled.
A changeover mechanism may be taken from EP-OS 235 446 with which a feeler connected to a lever system senses the diameter of the first roll and, as the decrease in diameter augments, moves a contact pressure roll by way of the lever system to the transport roll over which the paper is guided. Below the contact pressure roll, the leading end of the web of the replacement roll is supported at a fixed point and pressed against the transport roll when the first roll essentially has been unwound, whereby material can be unwound from the spare roll. With this structure it is not guaranteed that the beginning of the web of the replacement roll always can be grasped, nor is it guaranteed that it is not withdrawn unintentionally together with the first web.
DE-OS 28 12 756 describes a towel dispenser with which the first paper roll is disposed above the spare roll, the web to be withdrawn being guided along a spring loaded feeler between two spaced apart rollers to a transport and counter-pressure roller and from the latter to the removal opening. The web to be paid out is kept under tension between the first roll and the transport roll, the leading end of the second paper roll be
REFERENCES:
patent: 4236679 (1980-12-01), Jespersen
patent: 4307638 (1981-12-01), DeLuca et al.
patent: 4756485 (1988-07-01), Bastian et al.
Darling John P.
Scott-Feldmuhle GmbH
Stodola Daniel P.
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