JPS6365575B2 - - Google Patents

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a film conveying device, and more specifically, for example, when conveying a strip-shaped packaging film in a forming-fill-packaging machine, the present invention relates to a film conveying device. To provide a film conveying device capable of stably conveying the film at high speed by gripping both side edges and easily adapting to changes in the width of the film.

(B) Prior Art A conventional device for transporting film in a forming, filling and packaging machine includes, for example, a chuck that grips both side edges of the film, which is movable in a reciprocating straight line in the film transport direction, and the chuck is moved by a cylinder or cam, etc. The most common devices were devices that reciprocated the film, or devices that had a chain that moved around in the direction in which the film was fed, and chucks for gripping both edges of the film were attached to the chain.

However, these conventional devices have problems in that they are large, unsuitable for high-speed conveyance, and cannot quickly respond to changes in film width.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are to provide a device that is simpler in structure and more compact than conventional transport devices, and capable of transporting a strip-shaped film reliably and at high speed. At the same time, it is also possible to easily and quickly adjust the width of the film.

(d) Means for Solving the Problems In order to solve the above problems, the film conveying device of the present invention has a pair of supporting members that receive the film to be conveyed on the outer circumferential surface of the drive shaft so as to rotate together with the drive shaft. provided on the support member, a plurality of claws are rotatably provided on the support member and spaced apart in the circumferential direction for gripping the film to be conveyed in cooperation with the support member, and a roller is rotatably attached to the claws; A cylindrical cam member is provided adjacent to the support member and engages with the roller to control opening and closing of the pawl.

(E) Effect In the above configuration, if the drive shaft is rotated in a certain direction and the cam member is fixedly held, the support member rotates together with the drive shaft, and the gripping claws are rotated around the axis of the drive shaft. It rotates and opens and closes under the control of a cam member. When the gripping claws are closed by the rotation of the drive shaft, the film fed to the outer periphery of the support member when the gripping claws are open is gripped by the support member and the gripping claws, and is moved along the circumferential direction of the support member. Sent. When the drive shaft rotates by a certain angle, the gripping claws open and release the film.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

1 and 2, the film conveying device 1 of this embodiment includes a drive shaft 2 having a spline 21 formed on its outer periphery, and a pair of drive shafts 2 mounted on the drive shaft 2 facing each other and separated in the axial direction. The film gripping mechanism 3, 3a, and 3b are provided.

Each film gripping mechanism 3 has a sleeve 31 having a spline hole 32 formed in its inner periphery to fit with the spline 21 of the drive shaft 2, and a film support member 35 fitted and fixed to the sleeve 31. Therefore, the sleeve 31 and the film support member (hereinafter referred to simply as the support member) 35 rotate together with the drive shaft 2, but are relatively movable in the axial direction with respect to the drive shaft.

Support member 35 has a sleeve portion 36 and a radially outwardly extending flange portion 37 having an annular film support surface 38 formed around the outer periphery of the flange portion.

A support block 41 is provided on the side of the flange portion 37.
is installed. A support block 41 is attached. A large number of notches 42 are formed in the support block 41 at intervals in the circumferential direction, and each notch 42
A plurality of gripping claws 45 are rotatably attached by pins 43 at positions . The gripping claw 45 is constantly pressed by a spring 48 in the direction of rotation such that the tip 46 comes into contact with the film support surface 38 . Gripping claw 4
A cam follower or roller 49 is rotatably attached to the rear end of the roller 5.

A cylindrical cam member 50 is attached to the outer periphery of the sleeve portion 36 of the support member 35 via a bearing 39 so as to be rotatable relative to the sleeve portion 36 and therefore rotatable relative to the drive shaft 2 . A cam surface 51 that engages with the roller 49 is formed on the cam member 50 . The cam surface 51 is formed on the inner peripheral surface of the cam member 50, as shown in FIG. Direction outer part (portion with large radius of curvature) 5
3. This cam surface 51 is
9 is engaged with the inner portion 52, the gripping claw 45
The tip 46 is moved away from the film support surface 38 (this state is set as an open state), and when it reaches the outer part, it is moved away from the roller 49 and the gripping claw 45 is brought down by the action of the spring 48 (this state is closed). (in the same position) and hold the film.

The cam member 50 of each film gripping mechanism is attached to the bracket 6 as shown in FIG. This bracket 6 is attached to a long support plate 7 extending parallel to the drive shaft 2 so that its position can be adjusted in the longitudinal direction by a bolt (not shown) screwed into the bracket 6 through a long hole 71 in the support plate 7. There is. A scale 8 is attached to the support plate 7, and the width of the film that can be conveyed can be determined by the scale 8 and a pointer 9 attached to the bracket 6.

In the above configuration, the drive shaft 2 is indicated by the arrow X in FIG.
When the support member 35 rotates continuously in the direction of the
At the same time, the gripping claws 45 rotate at the same speed around the rotation axis of the drive shaft 2. As a result, the roller 49 attached to the gripping claw 45
1 and the outer portion 53 of the
The cam surface 51 is periodically moved away from the cam surface 51. Then, when the roller 49 is engaged with the inner portion 52 and the film f is placed on the film support surface 38 of the support member 35 at the position where the gripping claw 45 is open, when the roller 49 comes to the position of the outer portion 53, the gripping claw 4
5 closes and cooperates with the supporting member to grasp the film and transport the film.

When the drive shaft 2 rotates by a certain angle, the roller 49 attached to the gripping pawl comes into contact with the inner portion 52 of the cam surface, so that the gripping pawl opens and the film is separated from the support member.

Thereafter, the film f is fed by continuous rotation of the drive shaft.

Further, in order to change the distance between the film gripping mechanisms 3a and 3b by changing the width of the film, it is sufficient to loosen the bolt 72 and move the bracket while looking at the scale 8.

(g) Effects As described above, according to the present invention, not only the structure can be made simple and compact, but also high-speed conveyance is possible, and changes in the width of the film can be easily and quickly dealt with. Furthermore, if the drive shaft is rotated intermittently, it can also be used for intermittent feeding, which has a wide range of applications.

[Brief explanation of drawings]

1 is a perspective view of an embodiment of the film conveying device according to the present invention, FIG. 2 is a sectional view of a part of the device shown in FIG. 1, FIG. 3 is a perspective view of a gripping claw, and FIG. FIG. 2 is a sectional view taken along the line - in the figure, with rollers omitted. 1: Film transport device, 2: Drive shaft, 3: Film gripping mechanism, 35: Support member, 45: Gripping claw,
49: roller, 50: cam member.

Claims (1)

[Claims] 1. A pair of supporting members for receiving the film to be transported on the outer peripheral surface are provided on the drive shaft so as to rotate together with the driving shaft, and the supporting member has a plurality of supporting members that cooperate with the supporting member to grip the film to be transported. a cylindrical cam adjacent to the support member that engages with the roller and controls opening and closing of the pawl; A film conveying device characterized by being provided with a member.