| 摘要 |
1492251 Calenders HERMANN BERSTORFF MASCHINENBAU GmbH 22 April 1976 [24 May 1975] 16369/76 Heading B5A In a multi-roll calender there is provision to move a pair of rolls either in unison, perhaps with reference to a further roll, or to move one roll relative to the other to alter the gap between them. In the described embodiment, a pair of rolls are carried by journals 511 and 512. One journal 512 is carried by a bearing block 16 slidable along guide grooves 545 of the calender stand 514 and the other journal 511 is carried by a mounting member 544 slidable along guide grooves 543 of the bearing block. Projecting upwardly from the mounting member is a screw threaded spindle 23 which passes through an internally threaded sleeve 516 rotatably mounted in a cross-member 13 of the calender stand. The upper end of the sleeve is fixed to a worm gear 529 driven by a worm 534 and engageable via an electromagnetic coupling 527 with a spur gear 528 rotatably mounted around the sleeve. The spur gear co-operates with two further spur gears 525, 526 each of which is carried by a further internally threaded sleeve 515 or 517 also mounted in the cross member 513. Each sleeve contains a screw threaded spindle 22 connected to the upper surface of the bearing block 16. In operation, to move the rolls in unison, the coupling is energized to connect the spur gear 528 to the worm gear so that rotation of the worm gear by the worm 534 causes rotation of the spindle 23 directly and rotation of spindles 22 indirectly through spur gears 528, 525 and 526. Thus the bearing block and mounting member are moved together. To alter the gap between the rolls the coupling is de-energized to disconnect the spur gear 528 from the other spur gears, this causing only the spindle 23 to be rotated by the worm gear, and thus only the roll carried by journal 511 to move. The invention finds use in the calendering of plastics or rubber by a five-roll L-calender (see Fig. 1, not shown), a six-roll L-calender (see Fig. 2, not shown) a four-roll Z-calender (see Fig. 3 not shown) or a seven-roll L-calender (see Fig. 4, not shown).
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