Winding – tensioning – or guiding – Unwinding – With supply coil replenishment
Reexamination Certificate
1999-03-15
2001-03-13
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Unwinding
With supply coil replenishment
C242S423100, C242S422400, C242S599200, C242S598200
Reexamination Certificate
active
06199791
ABSTRACT:
The invention relates to a dispenser of a wound web in the form of a coreless roll and including an improved spindle.
More specifically, the invention concerns a paper dispenser for public use, in particular, wherein the dispenser assumes the form of a housing and includes at least one roll mounted on a support spindle. The free end of a paper web in a roll passes through a dispensing opening and the user pulling on the free web end unwinds the roll by rotating the roll about the fixed axis of the support spindle.
More particularly, the invention relates to paper dispensers housing coreless rolls, that is rolls of which the center of the wound paper to be dispensed makes direct contact with the support spindle.
Such coreless rolls allow more compact windings and consequently a larger length of paper at a given radial roll bulk.
As a result, the coreless rolls must be operated in special dispensers.
When the user wants to unwind a specific length of paper, he will thereby set the roll in motion. If the traction exerted on the paper is comparatively vigorous, a certain speed of rotation is imparted to the roll about the support spindle and, short of further design features, the kinetic energy stored in the roll may cause excessive unwinding, to the point of self-rotation, beyond the paper length wanted by the user.
Accordingly, the objective of the invention is to propose simple and economic means allowing efficient slowing down of the roll to avert such excessive unwinding, however, the decelerating means must not unduly oppose the deliberate unwinding by the user and must not degrade the paper roll. The opposing force must be less than the force rupturing the pre-cut sheet sizes.
Moreover, it was found necessary to determine with some accuracy and, foremost, to keep the axial roll position in the unwinding position. When the user unwinds the paper, his traction is rarely perfectly perpendicular to the roll's axis of rotation and thereby the roll tends to be axially offset on its support spindle, sometimes so much that it is axially offset from the housing opening through which the paper is meant to pass.
This problem assumes special significance when the dispenser is designed to receive a second roll on the same support spindle, namely in the stored position. When, in such a dispenser, the roll in the unwinding position has been exhausted, no more needs to be done than to axially shift the second roll from the stored position to the unwinding position, such a displacement being possible because the rolls are coreless.
Therefore, another object of the invention proposes means to axially hold the roll in its unwinding position.
For that purpose, the invention proposes a dispenser described above which is characterized in that the support spindle includes means axially locking the roll and in that the spindle bears means assuring roll deceleration during unwinding.
In other features of the invention:
the roll is axially forced by the braking means against a transverse, axially locking surface,
the braking means include a flat press bar driven by elastic means against a transverse side of the roll,
the flat press bar runs radially to the spindle in such a manner that the bar cooperates with the transverse roll side over the full length of a roll radius,
the flat press bar cooperates with the transverse roll side over the full length of a roll diameter,
the spindle is irrotational about its axis during roll unwinding and the flat press bar is irrotational relative to the spindle,
the flat press bar is in the form of a plate elongated in the direction of a roll diameter and is slidable along the support spindle, and the plate includes at each of its ends an axially running guide projection received in an aperture in a stationary guard plate running transversely in the dispenser,
the guard plate is rigidly affixed to the support spindle,
a spring is inserted between the guard plate and the decelerating flat bar to axially drive the latter against the roll,
the spindle is irrotational about its axis when the roll is being unwound and the spindle is fitted with at least one radial boss housed inside the roll and rubbing against the roll to decelerate the roll during unwinding,
the radial boss runs axially over a length less than the axial roll dimension,
the radial boss is configured axially substantially at the middle of the roll when the same is in its unwinding position on the support spindle,
the change in cross-section of the support spindle caused by the radial boss is continuous,
the radial boss runs around the axis at an angle less than 180°,
the radial boss is configured at an angle on the support spindle in a direction substantially opposite the direction in which the web is being dispensed,
the axially locking roll means include a frustoconical boss having the same axis as the support spindle, the base of the boss forming a transverse surface to axially lock the roll in one direction, and the conical surface of the boss facilitating roll installation by axially sliding the roll onto the spindle toward the roll's unwinding position,
the braking means axially pressing the roll against the base of the frustoconical boss,
the support spindle includes a T-shaped end to engage a corresponding dispenser channel to detachably affix the spindle in the dispenser and to lock the spindle so as to be irrotational about its axis,
the T-shaped end of the support spindle is a separate part mounted on the spindle, and
the means locking the roll axially includes a transverse washer configured between the T-shaped end and the spindle.
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Conran Sebastian
Dit Picard Bernard Louis
Malecot Yves
Neveu Jean-Louis
O'Connor Joseph Patrick
Breiner & Breiner
Fort James, S.a.r.l.
Walsh Donald P.
Webb Collin A.
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