초록 ▼

A system for aligning a moving run of fabric which has longitudinal and transverse threads along a path determined by a selected one of the longitudinal threads. The system includes optics for projecting an image of the longitudinal threads while suppressing the image of transverse threads, means fo

A system for aligning a moving run of fabric which has longitudinal and transverse threads along a path determined by a selected one of the longitudinal threads. The system includes optics for projecting an image of the longitudinal threads while suppressing the image of transverse threads, means for determining the direction of any deviation and the amount of deviation from the selected thread position, and guidance means for returning the run to a position in which the selected thread is in its desired position. An improved guidance means which effects transverse movement of the fabric run without introducing wrinkles or bias into the run is also disclosed.

대표청구항 ▼

A system for aligning a moving run of fabric having longitudinal threads which are aligned in the direction of movement of the run and transversely aligned threads including: (a) optical means for projecting an image of threads from said fabric onto a fixed target, said optical means enlarging the i

A system for aligning a moving run of fabric having longitudinal threads which are aligned in the direction of movement of the run and transversely aligned threads including: (a) optical means for projecting an image of threads from said fabric onto a fixed target, said optical means enlarging the image of longitudinally aligned threads and the spaces therebetween and suppressing the image of transversely aligned threads, (b) means for sensing the original position of a selected, longitudinally aligned thread relative to a fixed point on said target, (c) counting means connected to said sensing means, said counting means being responsive to transverse movement of the fabric relative to said fixed point to count the number of longitudinally aligned threads passing across said fixed point on said target, (d) means for determining the direction of movement of said selected, longitudinally aligned thread transversely of said fixed point, (e) guidance means engaging said fabric for moving said fabric transversely across said fixed point, (f) control means for said guidance means, said control means being adapted to position said guidance means to effect a change in the transverse position of said fabric relative to said fixed point on said target, (g) means responsive to said counting means and said direction determining means for activating said control means in response to transverse movement of said selected, longitudinally, aligned thread relative to said fixed point on said target to steer said fabric towards a position in which said selected, longitudinally aligned thread is in its original position relative to said fixed point.