Cutting segment for a false drum and method of supporting material overlying a slot
View Patent ↗A cutting segment for a False Drum ( 100,200,300 ) having a cylindrical outer surface ( 202,306 ) comprises a slot ( 204,224,330 ) extending generally axially from end-to-end of the cylindrical surface, a door panel ( 322 ) having substantially the same size and shape as the slot; and a mechanism ( 320 ) for opening and closing the door panel. The mechanism for selectively opening and closing the door panel includes an elongate lever ( 324 ), one end of which supports the door panel, the other end of which is pivotally attached to a stationary portion (point) of the drum, a spring ( 326 ) extending between an inner surface of the door panel and another stationary portion of the drum; and an inflatable pneumatic tube ( 328 ) disposed between the lever and yet another stationary portion of the drum. There is thereby provided a method of supporting material overlying the cutting slot of the False Drum, by opening the slot when cutting the material, and closing the slot when not cutting the material. Importantly, after the material is cut, the door panel closes the slot so that the cut end of the material does not hang in the slot, but rather is supported, thereby ensuring reliable transfer of the material to a tire building drum.
1. Method of supporting material overlying a cutting slot of a False Drum, characterized by:
providing a cylindrical drum having a perforated cylindrical outer surface upon which the material is laid and cut to a required length, the cutting slot being a radially inwardly-extending discontinuity in the outer surface of the drum extending generally axially from end-to-end of the cylindrical outer surface, the slot extending through the cylindrical outer surface and being sized and shaped to permit a cutting tool to pass through a portion of the material overlying the slot, the slot being circumferentially narrowest at a middle of the cylindrical drum, and is circumferentially wider towards opposite ends of the drum;
providing a door panel having substantially the same size and shape as the slot;
opening the slot when cutting the material; and
closing the slot when not cutting the material so that an outer surface of the door panel is contiguous with the outer surface of the drum.
2. Method, according to claim 1 , characterized by:
closing the slot after the material is cut.
3. Method of cutting material on a False Drum having a cylindrical outer surface and a slot in the surface for receiving an end of a cutting tool characterized by:
providing the slot as a radially inwardly-extending discontinuity in the outer surface of the drum, the slot extending generally axially from end-to-end of the cylindrical outer surface, the slot extending through the cylindrical outer surface and being sized and shaped to permit the cutting tool to pass through a portion of the material overlying the slot, the slot being circumferentially narrowest at a middle of the cylindrical drum, and is circumferentially wider towards opposite ends of the drum;
providing a door panel having substantially the same size and shape as the slot; and
providing a mechanism for selectively opening and closing the slot with the door panel whereby when the slot is closed, an outer surface of the door panel is contiguous with the outer surface of the drum;
disposing the door panel in the slot;
laying material on the cylindrical surface, and overlying the slot;
opening the door panel to expose the slot; and
with a cutting tool, cutting the material at the slot.
4. Method according to claim 3 , characterized by:
after cutting the material, closing the door panel to conceal the slot.
5. Method according to claim 3 , characterized by:
before laying the material on the surface, closing the door panel.
6. Method according to claim 3 , characterized by:
after cutting the material, removing excess material.
7. Method according to claim 3 , characterized by:
after cutting the material, closing the door panel to conceal the slot; and
after closing the door panel, transferring the material to a tire building drum.