초록 ▼

The invention relates to a roll stand (1') comprising a frame (3') with a roll-holding device (71) for two unwinding stations (A', B'), which frame (3') comprises means (101, 102, 103) for joining, in a roll-changing operation, a material web, which is unwound from a roll (12, 12a) provided with a r

The invention relates to a roll stand (1') comprising a frame (3') with a roll-holding device (71) for two unwinding stations (A', B'), which frame (3') comprises means (101, 102, 103) for joining, in a roll-changing operation, a material web, which is unwound from a roll (12, 12a) provided with a rotating spindle (171, 181), to a leading end, provided with adhesive, of a material web from another roll (12, 12a) which is similarly provided with a rotating spindle (171, 181), as well as means (108, 109) for cutting off the first-mentioned web and a mechanism for braking the spindles. The invention is further characterized by means (117, 118, 172, 173, 182, 183, 197) for, on the one hand, transferring the rotary moment from the roll spindles (171, 181) to a braking mechanism (115), comprising a free-wheel mechanism (157, 195) arranged to connect the braking mechanism (115) to the roll spindle (171, 181) which is momentarily rotating at the highest speed and on the other hand, at the start of a roll-change operation, transferring an accelerating moment from an acceleration unit (116) to the roll spindles (171, 181), which acceleration unit comprises a free-wheel mechanism (165, 166) arranged to connect the acceleration unit to the roll spindle (171, 181) which is momentarily rotating at the lowest speed.

대표청구항 ▼

[ We claim:] [1.] Roll stand comprising:a frame;at least one supporting shaft mounted on said frame;a roll-holding device on said at least one supporting shaft and having two unwinding stations, each unwinding station including a rotatably mounted roll spindle;means mounted on said frame for joining

[ We claim:] [1.] Roll stand comprising:a frame;at least one supporting shaft mounted on said frame;a roll-holding device on said at least one supporting shaft and having two unwinding stations, each unwinding station including a rotatably mounted roll spindle;means mounted on said frame for joining a first material web during a roll-changing operation unwound from a roll provided on one rotating roll spindle to a leading end of a second material web from another roll mounted on the other rotating roll spindle, the leading end being provided with adhesive;means for cutting off the first material web; anda rotational motion transmission connected to each of the roll spindles, said transmission including two coaxially arranged shafts running through said at one supporting shaft, roll arm transmissions connected between said two coaxially arranged shafts and said roll spindles, an acceleration unit arranged to drive said two coaxially arranged shafts, a braking unit arranged for braking the spindles, and means for transferring the rotary moment from the roll spindles to the braking unit, comprising a first free-wheel mechanism arranged to connect the braking unit to the one roll spindle which is momentarily rotating at a higher speed than the other roll spindle, and at the start of the roll-changing operation, for transferring an acceleration moment from the acceleration unit to the roll spindles, said transferring means further comprising a second free-wheel mechanism arranged to connect the acceleration unit to the one roll spindle which is momentarily rotating a lower speed than the other roll spindle.