of the mandrel assembly and the shaping device so as to be movable in parallel to the longitudinal axis of the mandrel 1 the capping and clinching device includes a chuck 14 fig3 comprising a pair of chuck halves 15 supported for rotation about a common pivot 18 fixed to a chuck holder 20 a pair of drive rods 16 are rotatably connected to the respective chuck halves 15 by way of pivots 17 the drive rods 16 are driven by a cam not shown to open and close the chuck 14 to grip a portion of the cylindrical shell plate 50 to be capped a cap chute 10 for supplying caps 40 is provided above the chuck holder 20 the cap 40 has a central opening 40a through which a film spool projects outside and an annular groove 40b extending along the peripheral edge of the cap 40 and opening on one side of the cap 40 on the other side of the cap 40 is formed an annular recess surrounded by an annular wall 40c which defines the inner peripheral wall of said annular groove 40b the chuck holder 20 is moved back and forth in parallel to the longitudinal axis of the mandrel 1 by a shaft 25 slidably supported on a holder 26 a clinching head 22 is moved back and forth in parallel to the longitudinal axis of the mandrel 1 by a shaft 23 which is slidably supported on the holder 26 the clinching head 22 brings the cap 40 into engagement with an end of the cylindrical shell plate 50 so that the end of the shell plate 50 is received in the annular groove 40b of the.