JPS6020562Y2 - Film feeding device for forming, filling and packaging machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film feeding device provided between the intermittent film feeding process and the continuous film feeding process in a forming, filling and packaging machine.

In a PTP packaging machine, if the drum vacuum method is used to form a container onto a film, the film flow will be continuous up to the sealing process, and if the container is formed onto a film using a flat plate molding method, the film flow will be continuous throughout the entire process. Generally, the flow is intermittent.

However, each method has its advantages and disadvantages.

In other words, when using the drum vacuum method, there is a structural problem in synchronizing the speed of the forming drum with the flow speed of the film, but in the tablet feeding process, the tablets are fed into the film container (pocket) because the film is flowing. It has the advantage of being easy to carry out because the supply is completed in several steps.

On the other hand, when using the flat plate bottom type method, the heating of the film during flat plate molding is uniform and efficient molding can be performed, but in the tablet feeding process, if the film is stopped intermittently, the tablets may become clogged, and the film will move intermittently. The disadvantage is that the tablet feeding device must be operated in synchronization with the system, resulting in a complicated structure.

Therefore, the film flow is performed intermittently until the forming process, and continuously from the tablet feeding process to the sealing process.
A device for absorbing slack in the film is provided in the conversion section from intermittent film flow to continuous film flow.

By the way, the conventional type of slack absorbing device is composed of a step roller d as shown in FIG.
There was a problem with shock during vertical movement, and pulsation was occurring due to the step roller in the subsequent continuous flow process.

Therefore, an object of the present invention is to provide a film feeding device that can automatically keep the tension of the film constant after feeding the film.

The present invention provides a film feeding device in which a feeding mechanism is provided on the upstream side in the film feeding direction and a tensioning mechanism is provided on the downstream side, separated from each other in the feeding direction, and in which slackness of the film is absorbed between the feeding mechanism and the tension mechanism. , the feed mechanism is rotated about the same axis as the drive shaft through a transmission plate fixed to a drive shaft driven by a motor, and a rotary plate frictionally engaged with the transmission plate through a brake lining. and a pressure roller which is pressed against the feed roller and is designed to sandwich the film between the tension mechanism and the film. A pair of shafts arranged so that one of them is pressed against the other, a roller rotatably supported by each of the pairs of shafts and in pressure contact with the film, and a brake device that applies a constant braking force to one of the rollers. It is configured with the following.

Embodiments of the film feeding device according to the present invention will be described below with reference to the drawings.

2 to 5, a film feeding device 1 according to this embodiment is shown.

This film feeding device 1 is a film f of a forming, filling and packaging machine.
The upstream side along the film transport path between the intermittent feeding device C that feeds the item intermittently and the feeding device e that feeds the item into the pocket formed in the film f.

The film feed mechanism 2 and the tension mechanism 4 are provided separately on the downstream side.

The film feeding mechanism 2 includes a hollow drive shaft 20 rotatably supported within a support tube 10 fixed to the main body of a forming, filling and packaging machine, and a length movably inserted into the drive shaft 20. It has a shaku support shaft 21.

A gear 22 is provided at one end of the drive shaft 20 and a transmission plate 2 is provided at the other end.
3 is fixed.

The gear 22 meshes with a gear 26 that meshes with a gear 25 of a motor 24, so that the drive shaft 20 is continuously rotated by the motor 24.

A spring receiver 2 fixed to one end of the drive shaft 20 and the support shaft 21
A spring 27 is provided between the support shaft 21 and the drive shaft 20 to bias the support shaft 21 to one side (to the right at 4 in FIG. 4) with respect to the drive shaft 20.

The support shaft 21 has a sleeve 3 on the opposite side from the spring 27.
0 is rotatably attached to the support shaft 21, and its axial movement is restricted by a stopper 211 fixed to the other end of the support shaft 21.

A flange 301 is integrally formed at the end of the sleeve 30 on the drive shaft 20 side, and this flange 301 prevents the support shaft 20 from being pressed to the right (at 7 in FIG. 4) by the spring 27. The stopper 211 causes the transmission plate 23 to
Since it is pressed to the side, it is frictionally engaged with the brake lining 28 joined to one surface of the transmission plate 23.

A plurality of feed rollers 31 (31
a to 31) f) are fitted and fixed.

Note that the sleeve 30 and the feed roller 31 may be formed integrally.

rollers 31 (31a to 3If) parallel to the support shaft 20;
A shaft 32 disposed adjacent to and supported by a stand 33
has a plurality of levers 34 (34a).

'34bt34c) is rotatably attached.

C at the tip of each lever 34 (34a, 34b, 34c)
A feed roller 31 rotatably attached to the support shaft 20
(31a, 31d, 31f) and a pressure roller 35 (35a, 31f) that pinches and feeds the flat part of the film f.
, 35 b, 35 c) are rotatably attached.

The rear end of each lever 34 (34at 34b934c) is connected to a spring 36 (36a, 36b*36
c) is pulled by the pressure roller 35 to the roller 3
Oppressing one side.

The tension mechanism 4 is rotatably attached to a support shaft 40 and a support shaft 40 arranged and fixed at right angles to the advancing direction of the film at the lower side of the transport path for the film f (the side from which the pocket P protrudes). a hollow rotating shaft 41; and a plurality of annular rollers 42 fitted and fixed at predetermined intervals on the outside of the hollow rotating shaft.
(42a, 42b, 42c), a brake device 44 provided at the end of the hollow rotating shaft, and a brake device 44 that is rotatably attached to a bracket 51 on the upper side of the film f and rotated clockwise by a spring 54 (Fig. 4). A shaft 50 is attached parallel to the support shaft 40 at the tip of a lever 52 which is pressed by a lever 52, and a cylindrical roller 53 is rotatably attached to the shaft 50. being oppressed.

The brake device 44 includes a brake plate 45 fixed to the end of the hollow rotating shaft 41, an annular housing 46 arranged and fixed adjacent to the brake plate, and the housing mounted movably within the hole 460. A piston 47 is inserted and pressed toward the brake plate by a spring 48, and a brake liner 49 that frictionally engages with the brake plate 45 is attached to the tip of the piston 47.

Therefore, a constant braking force determined by the spring 48 is applied to the hollow rotating shaft and the roller.

In the film feeding device having the above configuration, the film f starts to operate while being held by each of the rollers when the forming, filling and packaging machine is started.

In this film feeding device, when the drive shaft 20 is rotated by the motor 24, the rotation is transmitted to the plurality of feeding rollers 31 (31a to 31f) via the transmission plate 23, flange 301, and sleeve 30.

The feed roller 31 and the pressure roller 35 (35
The film sandwiched between a to 35C) is continuously fed out in the direction of arrow X.

At this time, the rotational speed of the motor 24 is slightly faster than the speed at which the film moves due to film feeding, so the film does not sag, and the film is moved to the brake lining 2.
8, it is always fed out with a constant tension.

Next, the film f sent out from the feeding mechanism passes between the annular roller 42 (42a to 42C) and the cylindrical roller 53 of the tension mechanism 4 and is sent to the downstream seal roller.

When passing through this tension mechanism, a constant braking force is applied to the annular roller 42 by the braking device 44, so that the braking force also acts on the film f, so that the film being pulled by the sealing roller has a constant braking force. tension will be added.

In this way, according to the present invention, it is possible to automatically feed the film and apply a certain tension to the film being fed downstream, so (a) there is no loss of film, and (b) continuous feeding is possible. Since there is no pulsation in the film, there is no unnecessary stretching of the film, resulting in stable sealing.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a conventional forming, filling and packaging machine using step rollers, Fig. 2 is a schematic diagram of a forming, filling and packaging machine equipped with a film feeding device according to the present invention, and Fig. 3 is a schematic diagram of a forming, filling and packaging machine according to the present invention. Side view of the feeder, Figure 4 is taken along line I in Figure 3.
5 is a cross-sectional view taken along line V--IV in FIG. 3. FIG. 1: Feeding device, 2: Feeding mechanism, 20: Drive shaft, 23: Transmission plate, 30 Ni sleeve, 31: Feed roller, 3 Ni brake mechanism, 42, 53: Roller, 44 Ni brake device.

Claims (1)

[Scope of utility model registration request] In a film feeding device, a feeding mechanism is provided on an upstream side in a film feeding direction, and a tensioning mechanism is provided on a downstream side separated from each other in the feeding direction, and in which slackness of the film is absorbed between the feeding mechanism and the tension mechanism. The mechanism includes a transmission plate fixed to a drive shaft driven by a motor, and a feed roller that rotates around the same axis as the drive shaft via a rotary plate that is frictionally engaged with the transmission plate through a brake lining. and a pressure roller that is pressed against the feed roller and is configured to sandwich the film between the tension mechanism and the tension mechanism that is arranged parallel to each other while sandwiching the film. A pair of shafts, one of which is pressed against the other, rollers that are rotatably supported by several pairs of shafts and come into pressure contact with the film, and a brake device that applies a constant braking force to one of the rollers are provided. A film feeding device for a forming, filling and packaging machine, characterized by the following configuration.