초록 ▼

A roller width adjusting device for a divided molding roller has a hollow main shaft journalled at each end to side bearings so as to be rotatable around a rotary axis thereof. The hollow main shaft is connected at one end to a driving source for rotating the main shaft around the rotary axis. A pai

A roller width adjusting device for a divided molding roller has a hollow main shaft journalled at each end to side bearings so as to be rotatable around a rotary axis thereof. The hollow main shaft is connected at one end to a driving source for rotating the main shaft around the rotary axis. A pair of hollow cylindrical roller holders are disposed on an outer periphery of intermediate portions of the main shaft so as to be slidable along the rotary axis of the main shaft. The roller holders may be fixed in any position along the rotary axis by a holding device. A pair of divided type molding rollers are attached to the roller holders, respectively. An adjusting shaft is rotatably disposed in the hollow shaft along its rotary axis. Each end of the adjusting shaft has a screw thread with opposed screw directions. One end of the adjusting shaft has a rotatable handle. By rotating the handle in one direction the interval between divided rollers is increased thus moving the roller holders farther apart; whereas by rotating the handle in the other direction the interval is decreased thus drawing the roller holders closer together. Once in position, the divided rollers are slidably fixed by the holding device such that pipe of that particular size can be manufactured.

대표청구항 ▼

A roller width adjusting device for a divided type molding roller, comprising: a hollow main shaft having a first end and a second end, an interior area, an outer periphery and a rotary axis; a first side bearing journalled to said first end of said hollow main shaft; a second side bearing journalle

A roller width adjusting device for a divided type molding roller, comprising: a hollow main shaft having a first end and a second end, an interior area, an outer periphery and a rotary axis; a first side bearing journalled to said first end of said hollow main shaft; a second side bearing journalled to said second end of said hollow shaft; a gear disposed at said first end of said hollow main shaft for being connected to a drive source for driving said hollow main shaft; a first hollow cylindrical roller holder axially slidably disposed on said outer periphery of said first end of said hollow main shaft; a second hollow cylindrical roller holder axially slidably disposed on said outer periphery of said second end of said hollow main shaft; a first divided type molding roller connected to said first roller holder; a second divided type molding roller connected to said second roller holder, wherein said first and second divided type molding rollers are disposed with an interval therebetween; holding means for fixing said first and second roller holders at a plurality of axial positions along said outer periphery of said main shaft; an adjusting shaft rotatably disposed in said interior area of said main shaft and having a first adjusting shaft end and a second adjusting shaft end, wherein said first adjusting shaft end has a screw thread in a first direction and said second adjusting shaft end has a screw thread in a second direction different from said first direction and a rotatable handle disposed on one of said first and second adjusting shaft ends; a first screw movable on said screw thread in said first direction in a first expanding direction of movement and a first contracting direction of movement, wherein said first screw transmits said first expanding direction of movement and said first contracting direction of movement to said first roller holder; a second screw moveable on said screw thread in said second direction in a second expanding direction of movement opposite to said first expanding direction of movement and a second contracting direction of movement opposite to said first contracting direction of movement, wherein said second screw transmits said second expanding direction of movement and said second contracting direction of movement to said second roller holder, wherein said rotatable handle controls said movement of said first and second screws and thereby said first and second roller holders, wherein said rotatable handle is rotatable in one direction thereby causing said first and second screws to move in said first and second expanding directions of movement and in another direction thereby causing said first and second screw to move in said first and second contracting directions of movement.