| 摘要 |
<p>Apparatus for feeding sheet material, e.g. in the form of plastics film to an operating machine in the form of a bag making machine, comprises a support device (6) comprising a support (8) on which a bulk supply (10) of sheet plastics film, conveniently in the form of a drum, may be mounted. Sheet material (12) is drawn from the drum over a sensing roller (14) through a securing device (16) thence around a pair of drive rollers (22) of a feeding means, to a take-up device (24). Simultaneously a sheet 42 from a stationary roller (38) extends in the securing device in face-to-face contact with the sheet (12) As the trailing edge of the sheet (12) comes off the drum (10), it passes the sensing roller (14) which thereby detects emptying of the drum (10), and causes rotation of the drive roller (22) momentarily to be terminated, whilst a welding device (16) secures the trailing end portion of the sheet (12) to the leading end of the second sheet. Feeding is then re-commenced, and if desired the support device (6) may be rotated through 180<o>, to positionally interchange the drums (10 and 38), to enable the empty drum (10) to be replaced by a fresh drum, and sheet drawn therebetween and located in the securing device (16), to be secured to the sheets (42) when the sheet (42) empties. <IMAGE></p> |
