Sewing – Stitch forming – Feeding work material
Patent
1981-05-19
1984-11-20
Schroeder, Werner H.
Sewing
Stitch forming
Feeding work material
11212111, 198859, D05B 2700
Patent
active
044832664
ABSTRACT:
A sewing machine having a power-driven needle has an endless feed belt for moving workpieces beneath the needle. The belt stops and advances, and there is provision for measuring the movement of the belt upon each advance of the belt. In response to this measurement, the belt is stopped, thereby to ensure that the belt moves only a predetermined distance beneath the needle each time the belt advances. To advance the belt, there is a friction roll in contact with the belt, a back-up roller on the opposite side of the belt from the friction roll, and structure selectively to apply the back-up roll forcibly against the belt and to move the back-up roll away from the belt, thereby respectively to drive the belt and to interrupt the drive to the belt. The measuring structure is a wheel that rotates in frictional contact with the belt, the wheel including a transparent plate having radial scale markings thereon, a stationary transparent ruled interference grating has parallel markings thereon that overlie the markings on the transparent plate. A light source transilluminates both the grating and the transparent plate, and photoelectric cells on the other side of the plate and grating from the light source detect interference fringes and generate a signal responsive to the detection of the interference fringes, which signal is indicative of the distance the belt travels. The starting and stopping of the belt are controlled according to this signal.
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Kocsis Oliver
Kovacs Jozsef
Olasz Sandor
Szalay Denes
Csepel Muvek Jarmu es Konfekcioipari Gepgyara
Falik Andrew M.
Schroeder Werner H.
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