JP2001227601A - Sprocket width adjusting device applicable to perforation width of film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a sprocket in common by varying a sprocket width to films different in perforation hole width. SOLUTION: A sprocket is formed by two sprocket discs 1, 1 split in the axial direction to slide on a rotating shaft 4, and the respective sprocket discs 1, 1 contain ball plungers projected inward by spring force, and the rotating shaft is provided with plural grooves engaged with the ball plungers and engraved so that the distance between the sprocket claws 3, 3 provided on the outer peripheries of the sprocket discs 1, 1 agrees with the perforation width of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus capable of freely adjusting a sprocket width for different perforation widths on a film.

[0002]

2. Description of the Related Art A sprocket adapted to a film perforation width is fixed on a shaft, and a film perforation having a different width, which is exclusively used, cannot be used and needs to be replaced.

[0003]

SUMMARY OF THE INVENTION A sprocket disk is combined with a moving film perforation width left and right without replacing the sprocket.

[0004]

The claw tip of a sprocket disk mounted on a rotating shaft is stopped at a position suitable for a film perforation hole. At this time, the ball at the tip of the ball plunger in the sprocket disk stops at the groove of the rotating shaft. Each groove width is positioned to match the film perforation and sprocket width.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment will be described with reference to the drawings. In FIG. 1, a sprocket disk (1) fitted to a rotating shaft (5) is fixed to a moving film perforation width to the left and right. The ball plunger (2) in the sprocket disk is fixed to the groove (7) on the rotating shaft.

[0006]

The present invention is embodied in the form described above and has the following effects.

In the present invention, the sprocket width can be freely adjusted with respect to a conventional sprocket having a fixed tooth width, and the width of each sprocket is determined promptly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sprocket (13) on a rotary shaft in which a sprocket is incorporated. The sprocket (13) is adapted to the dimensions of FIG. 5 (a).

FIG. 2 shows the movement of the sprocket from side to side (14) is adapted to the dimensions of FIG. 5 (b).

Fig. 3 Groove width on the rotating shaft of sprocket

FIG. 4 is a sectional view of a sprocket disk, showing the position of a ball plunger.

FIG. 5 is a diagram of a film perforation width suitable for a sprocket width.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sprocket disk 2 Ball plunger 3 Sprocket claw 4 Rotating shaft 5 Sprocket movement guide 6 Retaining ring 7 Ball plunger stop groove 8 Stop position 9 Stop position 10 Stop position 11 Ball plunger stop position 12 Ball plunger stop position 13 Sprocket Claw stop position 14 Sprocket claw stop position 15 Film perforation hole

Claims (5)

[Claims] 1. A sprocket (1) for a film having different intervals and a perforation width (a) (b) (c)
A device that can change the width freely. 2. A device in which two right and left sprockets are mounted on a rotating shaft (4), and the sprockets are moved right and left so as to be aligned with a film perforation hole (15). 3. A device wherein the ball plunger (2) in the sprocket disk stops at the groove (7) on the rotating shaft at the time when the sprocket to be moved is in contact with the film perforation hole and the sprocket claw (3). 4. A device in which three balls at the tip of a ball plunger are pushed by a coil spring of the plunger and are mounted at intervals of 120 °, and pressure is applied to the movement of the sprocket disk. 5. An apparatus in which a guide groove is provided on a rotating shaft so that a sprocket disk is moved left and right on the rotating shaft so that parallelism with the shaft is always maintained.