GB1433335A - Stenter frames - Google Patents

Abstract

1433335 Stenters CHAMPION ASSOCIATED WEAVERS Ltd 6 July 1973 [13 July 1972] 32883/72 Heading D1S A stentor frame, for use in a carpet printing apparatus, has two wings 6, 10 one wing 6 of which is biassed outwardly and is connected to a control arm 20 movement of which to either side of a rest or neutral position actuating one of two switches 34, 44 for a width control motor 36 of the frame, the actuation of the respective switch causing the motor 36 to move the wing 6 in a direction to increase or decrease the distance between the wings 6, 10 so that the arm 20 is returned to its neutral position either by the biassing means 30, if the tension in the carpet fabric 2 had increased above the desired limit, or by the tension in the fabric, if the tension had fallen below the desired limit. As shown, the fabric 2 is stretched between pins 4, 8 on movable belts carried by wings 6, 10 carrying sprockets 12, 11 engaging opposite screw threads on a shaft 14 connected to a bar 16 pivoted at 18 to the arm 20. The wing 10 is fixed. The arm 20 is connected to a fixed pivot 22 and is pivoted at 26 to a piston rod 28 of an air cylinder 30. Air pressure in the cylinder 30 urges the arm 20 clockwise about the pivot 22 and the wing 6 outwardly. The arm 20 is held in the neutral position shown when the tension in the fabric 2 reaches that of the air pressure. If the weft tension rises, the arm 20 pivots anticlockwise and a plate 32 thereon operates a switch 34 to drive the motor 36 to move the sprockets 11, 12 inwardly towards each other. The weft tension is reduced and the motor 36 is stopped when the arm 20 returns to the Fig. 1 position. If the weft tension falls, the arm 20 pivots clockwise and a plate 42 thereon closes a switch 44 to drive the motor 36 to move the sprockets 11, 12 outwardly. The tension is increased until the arm 20 returns to the Fig. 1 position and the motor 36 is stopped. To increase or decrease the normal tension in the fabric a valve (not shown) is adjusted to alter the pressure in the cylinder 30. A further switch (not shown) may be provided to prevent the wing 6 being moved too far outwardly if the carpet 'has not been engaged on either the pins 4 or 8.