chamber which has vacuum suction holes communicating with a single suction unit and is divided into a plurality of small chambers to cope with various widths of films may be provided instead of the internal chambers 25d since the bar 25 has the film suction holes 25b2 at the longitudinal edge of the bar nearer the film bonding position than the other longitudinal edge of the bar as shown in fig8 c 8d 8e and 8f the yet unbonded trailing edge portion of the cut off stratified film 1b is securely sucked and held by the bar until the portion reaches a position in which the portion is sufficiently near the base plate conveyance passage the operation of the bonding apparatus is briefly described from now on when it is detected by a base plate leading edge position sensor which is provided near the base plate conveyance passage but not shown in the drawings that the base plate 22 is conveyed to a film initial bonding position in which the film 1b is initially bonded to the base plate the sensor sends out a detection signal so that the rotation of the driving rollers 23a are stopped at the same time the rotation of the base plate holding roller 24a is also stopped immediately after the leading edge of the base plate 22 has passed under the roller 24a the pneumatic cylinder 24b for moving the roller is put into action on the basis of a detection signal so that.