System for cutting pieces from a traveling strip of sheet material
AssigneeMitsubishi Rayon Co., Ltd.
InventorTetsuji Kato
Life of this patent
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Abstract
Continuously cast plastic strip has interspaced marks or defects with lengths of unmarked usable strip therebetween. To obtain a maximum possible yield of sheets from such strip, the lengths of the portions between the marks or defects are measured and cut into sheets of two or more different lengths, the cutting being such as to produce the maximum yield of sheets of either or all lengths, singly or in combination, which can be obtained from the length cut. This procedure reduces the loss or waste due to the marks or defects, to a minimum. A special system is provided for this practice and for cutting out the marks or defects between the unmarked strip portions free from defects, with a minimum of loss or waste. Other features are involved.
Claims7
An apparatus for cutting a traveling strip of plastic into pieces and comprising a stationary bed positioned under the traveling strip and a pair of units mounted on said bed and through which the strip travels in succession;
- each unit comprising an upstanding frame mounted on said bed and extending transversely across the strip and which is reciprocative on the bed in the strip's longitudinal direction, said frame having powered means for reciprocating it independently and individually with respect to the corresponding frame of the other unit, and said frame mounting a screw-threaded drive shaft extending transversely across the strip and having a guideway parallel to the shaft and a carriage in screw-threaded engagement with the drive shaft and reciprocatively guided by the guideway to traverse the strip, said drive shaft having a rotary drive motor which is independently and individually operative with respect to the corresponding drive motor of the other unit, a rotary motor and rotary saw assembly being mounted by said carriage with the saw positioned to make a transverse cut in the strip;
- each of said units being individually reciprocative and its screw-threaded drive shaft drive motor being individually controllable.
Dependencies are inferred from the claim text.