Fabric alignment method and machine
First Claim
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1. Apparatus to correct the alignment of a web of material having a plurality of rows of ferrous containing markings on the back thereof comprising:
- a frame, a plurality of input rolls, a plurality of output rolls, each of the input rolls having a corresponding output roll, means to drive the corresponding input roll and output roll in synchronism, means to supply the web of material to said input and output rolls, means to drive each set of corresponding input and output rolls separate from the drive of the other sets of corresponding input and output rolls, means to vary the speed of each set of corresponding input and output rolls and means operably associated with the ferrous markings on the back of the web material to sense the position of the markings to control the means to vary the speed of each set of corresponding input and output rolls.
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Abstract
Method and apparatus to automatically detect and correct the bow and skew of a moving web of material. Individually controlled rolls are employed to speed up or retard the speed of a section of web material when a control mark is detected by a magnetic response detector to realign the section of fabric detected with other sections of the web of material.
50 Citations
16 Claims
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1. Apparatus to correct the alignment of a web of material having a plurality of rows of ferrous containing markings on the back thereof comprising:
- a frame, a plurality of input rolls, a plurality of output rolls, each of the input rolls having a corresponding output roll, means to drive the corresponding input roll and output roll in synchronism, means to supply the web of material to said input and output rolls, means to drive each set of corresponding input and output rolls separate from the drive of the other sets of corresponding input and output rolls, means to vary the speed of each set of corresponding input and output rolls and means operably associated with the ferrous markings on the back of the web material to sense the position of the markings to control the means to vary the speed of each set of corresponding input and output rolls.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of maintaining the alignment of the pattern on a web of material comprising:
- placing a plurality of rows of ferrous marks on the back of the web of material in registry with the pattern on the other side of the web of material passing the web of material over a plurality of aligned rolls, sensing each line of ferrous marks as they pass a reference point and generating a pulse, and supplying the generated pulse to one of the aligned rolls to control the speed thereof.
- View Dependent Claims (16)
Specification