Patent GB-1153625-A (GB)
Title: Apparatus for Advancing a Web by Adhesively Securing it to a Transport Band
IPC: B41F15/24
Filed: 1966-07-01
Abstract: 1,153,625. Feeding webs. FRITZ BUSER A.G. 1 July, 1966 [2 July, 1965], No. 29648/66. Heading B8K. [Also in Division B6] In apparatus wherein web material, e.g. textile material, is fed intermittently through a machine, such as a screen printing-machine making successive imprints on the material, by being adhered to an endless band to which thermoplastic adhesive has been applied, the web is pressed on to the band by a heated roller and the pressure is varied as a function of the speed of the web past the heating roller so that variations in the adhesion of the web to the band due to speed variations are avoided. In one arrangement, Fig. 3, the endless feed band 52a passes over fixed axis rollers 52, and the textile web 56a passes over a guide roller 56 and a heated roller 55 on to the band 52a. A counter-pressure roller 54 co-operates with the roller 55, and the three rollers 54 ... 56 are mounted on a carriage 53 which reciprocates between positions 53<SP>1</SP>, 53<SP>11</SP> along the line of the upper run of the band 52a. Reciprocating grippers intermittently advance the upper run of the band 52a. A variable-speed oil motor drives the roller 54, the motor speed being controlled by a valve actuated by a feeler 57 on the carriage 53 engaging a cam 58, the carriage 53 being moved along the band 52a by the engagement of the rollers 54, 55 with the band. The control effected by the feeler 57 is such that during a feed movement of the band 52a, the speed of the carriage towards position 53<SP>11</SP> is less than that of the band by an amount equal to the rate of feed of the web past the heating roller 55, and so that when the band is stationary, i.e. during a printing operation, the carriage returns to the position 53<SP>1</SP> with a speed equal to the rate of web feed past the roller 55. An hydraulic cylinder presses the roller 55 against the roller 54 against the action of a spring and the pressure in the cylinder is adjusted by a valve actuated by another feeler-and-cam device similar to the devices 57, 58. Thus the rate of web feed past the heating roller 55 and the pressure of the roller are dependent on the carriage position, and therefore the pressure varies with the web speed past the roller 55. In another embodiment (Figs. 1, 2), wherein the feed band is carried by rollers on carriages reciprocating in the direction of feed, and is operated as described in Specification 1,037,467, a web guide roller (6) co-operating with the left-hand band roller (27) is formed as a heating roller and drives a pump connected to the hydraulic cylinder exerting pressure on the heating roller, so that the pressure between the rollers varies with the speed of the heating roller. According to another arrangement, Fig. 5, wherein the feed band 85 is carried by rollers 83 on carriages 84, the carriages being reciprocated, and the upper run 85a of the band being intermittently moved forward by grippers, as described in Specification 1,037,467, the web 88 is fed on to the lower run 85a of the band between a heating roller 87 and a vertically-movable pressure roller 86. A cam 89 attached to the carriage 84 is engaged by a feeler 90 actuating a valve controlling hydraulic pressure applied to the roller 86, so that the pressure depends on the carriage position. Due to the actuation of the carriage as described in Specification 1,037,467, the speed of web feed past the rollers 86, 87 is also dependent on carriage position, so that such speed is related to the pressure between the rollers.