DEVICE FOR CUTTING CORD WEBS TO SIZE FOR THE PRODUCTION OF PNEUMATIC TYRES

摘要

1293823 Cutting webs A HERBERT and M GUHR [trading as LEONHARD HERBERT MASCHINENFABRIK] 13 May 1970 [13 May 1969] 23249/70 Heading B4B A device for cutting through cord webs for the production of pneumatic tyres comprises two downwardly directed pointed blades 57, 571 each movable with a carriage unit 36, Fig. 6, appropriate thereto and guided in the direction in which cutting is to be effected, and a driving mechanism operable to reciprocate the units 36 towards and away from each other to cause cutting of the web by the blades the points of which at the start of the cutting operation are in mutual contact. The device is characterized in that each blade is arranged to be pivotable about the axis of a vertical spindle 44, 441 individual thereto and mounted in its carriage unit. In the device described, carriages 29, 30, Fig. 3, are reciprocated along guide bars 27, Fig. 6, by a cable 31, Fig. 3. In operation, a cord web to be cut is fed by belts 12a to 12d over a grooved cutter bar and beneath the blades until a sufficient length of material has been measured. Feed is then stopped and a cylinder 67, Fig. 6, is actuated to cause a thrust plate 69 to move the spindles 44, 441 axially downwards so that the points 60 of the blades pass through the cord web and enter the groove in the cutter bar. The carriages 29, 30 are then separated to cause the blades to cut the web. As the blades near the edges of the web, spring-loaded rollers carried by the carriages depress spring-loaded arms 90, Fig. 3, to cause pads 91 thereon to clamp the web edges whilst cutting is completed. After cutting and still during the blade separating movement, rollers 65 carried by the blade carriers 55, 551 are raised by running along arms 95 so that the blades are lifted to their original positions before they are returned to their starting position. Whilst in their separated positions, the blades are heated by inserting them between spring-loaded electrically heated plates (97, 98), Fig. 4 (not shown). The spindles 44, 441 are held in their raised or lowered positions by spring-loaded detents 53, Fig. 6. The angle at which the web is cut may be varied.