JPH0234168Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a film feeding device for feeding stretch film from a stretch film roll in a packaging machine that wraps items to be packaged with stretch film.

[Prior art]

Many years have already passed since the practical use of packaging machines that wrap items to be packaged in dish-shaped containers with transparent stretch film. During this time, various packaging machines have been proposed and improvements have been made. The same applies to a film supply device for supplying film to a packaging machine.

Figure 2 shows the applicant's earlier application (Utility Application 1986-
No. 02406) is a diagram showing the structure of a film supply portion of the film roll fixing device.

In the figure, 1 and 2 are rollers that support the stretch film roll F1 arranged at a predetermined interval, and the stretch film roll F1
The stretch film f1 fed out passes through the upper part of the roller 1, passes through the guide roller 3, is pulled by a film feeding roller (not shown), and is supplied to a film transfer device which transfers the film by holding both ends with grippers. Ru. Brakes 4 are provided at both ends of the roller 1.
brake shoe 4a and the brake shoe 4a
It is composed of a frame body 4b for fixing the frame body 4b, and a plate body 4c having an inverted L-shaped cross section for fixing the frame body 4b.

[Problem that the invention attempts to solve]

In the film supply section having the above structure, the stretch film is fed while being pulled with a predetermined force by a film feed roller (not shown), so that the stretch film pulled out from the film roll becomes loose and the stretch film is stretched. This is effective in preventing the film from adhering. However, the weight of the stretch film roll F1 is heavy at the beginning of the film supply, and becomes lighter as it approaches the end of film supply, so the stretching force applied to the stretch film f1 is strong at the beginning of the stretch film, and becomes weaker as the end time approaches. Therefore, a phenomenon occurs in which the width of the stretch film f1 unrolled from the stretch film roll F1 is narrow at the beginning and becomes wider as the end time approaches. This leads to the phenomenon that the amount of film gripped by the gripper of the film transfer device is small at the beginning of the stretch film roll F1, but increases as the end time approaches, and as a result, the film folding mechanism covers the wrapped object. When folding the stretch film, there was a problem in that the film did not come out easily.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a film feeding device which improves the film feeding device described above and allows the stretch film to be fed out from a stretch film roll so that the width of the stretch film is always constant. .

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention arranges two support rollers arranged in parallel with a predetermined interval in multiple stages, and places each support roller on top of the two support rollers arranged in the multiple stages. A packaging machine configured to feed stretch film selectively unrolled from a plurality of stretched film rolls placed therein via a single film unwinding roller to a film transport mechanism that transports stretch film while holding both ends with grippers. In the film feeding device shown in FIG. The present invention is characterized in that a rotational force transmission mechanism is provided for pushing out the belt and transmitting the rotational force of the belt to the driving pulley of at least one of the support rollers.

[Effect]

By configuring the film feeding device in the packaging machine as described above, the support roller that supports the stretch film roll is forcibly rotated at a predetermined speed in conjunction with the rotation of the film feed roller, so that the stretch film roll is removed from the stretch film roll. The stretching force applied to the stretched stretch film is always constant.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1A and 1B are diagrams showing the structure of a film feeding device in a packaging machine according to the present invention; FIG. 1A is a front view of the film feeding device, and FIG. 1B is a side view thereof. In the figure, 11, 12 and 13, 14 are
These are support rollers that support the stretch film rolls F1 and F2, respectively, and the support rollers 11 and 12 are arranged in parallel with a predetermined interval and rotatably supported by the packaging machine frame 15 via a support member 16. Further, support rollers 13 and 14 are also arranged in parallel with a predetermined interval and rotatably supported by the packaging machine frame 15 via a support member 17. 1
8 and 18' are the stretch film rollers F1.
A stopper plate for positioning and supporting both ends of the
9 and 19' are the stretch film rollers F2.
This is a stopper plate for positioning and supporting both ends. 20 is a film feeding roller that feeds out the stretch film from the stretch film roller F1 or F2; 21 is a timing belt located at the tip of the film feeding roller;
A cutter 2 is located between the film feeding roller 20 and the timing belt 21 and cuts the stretch film fed out from the stretch film roll F1 or F2 into a predetermined length.

The structure of the film feeding device is substantially the same as the structure of the film feeding section according to the above-mentioned earlier application, so the details will be omitted.

The main point of this embodiment is that the supporting roller 11 or 13 is rotated in conjunction with the rotation of the film feeding roller 20.
The point is that a roller rotation mechanism 30 for rotating the roller is provided. The roller rotation mechanism will be explained below.

The roller rotation mechanism 30 has large diameter guide rollers 32 and 33 rotatably disposed at both ends of a rotation mechanism frame 31, and is rotatably disposed opposite the large diameter guide rollers 32 and 33, respectively. The rotation mechanism frame 31 is configured to rotate around a pivot shaft 36. In order to rotate the support roller 11 or 13 in conjunction with the film feed roller 20, a pulley 1 is attached to one end of the support rollers 11 and 13 integrally with the rollers 11 and 13.
1' and 13'. The round rubber belt 37 is fixed to the shaft of the film feed roller 20 and rotates in conjunction with a pulley 20', a pulley 11' or 13',
It is stretched between the large-diameter guide roller 32 and the small-diameter guide roller 34, between the large-diameter guide roller 33 and the small-diameter guide roller 35, and via a guide roller 38 provided at the lowest end.

In the roller rotation mechanism 30 configured as described above, when the rotation mechanism frame 31 is rotated clockwise about the pivot shaft 36, the round rubber belt 37 is guided by the large diameter guide roller 32 and pressed against the pulley 11'. Therefore, the support roller 1 integrated with the pulley 11'
1 rotates by receiving driving force from a round rubber belt 37. At this time, the round rubber belt 37 comes off from the pulley 13' of the support roller 13, so the support roller 13
The driving force is not transmitted to the In addition, the rotation mechanism frame 3
1 is rotated counterclockwise around the pivot shaft 36, the round rubber belt 37 is guided by the large diameter guide roller 33 and pressed against the pulley 13'.
The support roller 13, which is integrated with the pulley 13', rotates by receiving driving force from the round rubber belt 37. At this time, the round rubber belt 37 is also removed from the pulley 11' of the support roller 11, so no driving force is transmitted to the support roller 11.

That is, the roller rotation mechanism 30 selectively transmits the rotational force of the round rubber belt 37 to the roller 11 or the roller 13 by rotating the rotation mechanism frame 31 clockwise or counterclockwise about the pivot shaft 36. This constitutes a rotational force transmission mechanism.

Now, when the rotating mechanism frame 31 is rotated clockwise around the pivot shaft 36, the support roller 11 rotates as described above, and the stretch film placed on the support rollers 11 and 12 rotates. The stretch film f1 fed out from the roll F1 passes through the lower part of the support roller 11 and then passes through the film feeding roller 20.
The film is then fed out to the film transport device 21, and is further transported through the timing belt 21 to a film transport device. Similarly, when rotating mechanism frame 31 is rotated counterclockwise,
The stretch film is supplied from the stretch film roll F2.

In the above configuration, the film feeding roller 2
By making the diameter of the pulley 20' smaller than the diameter of the pulley 20', the circumferential speed of the pulley 20' is slower than that of the film feed roller 20, so a predetermined tension is applied to the stretch film, so that it is always stretched at a constant level. It becomes possible to apply force to the stretch film. Note that even if the diameters of the pulleys 11' and 13' are made larger than the diameters of the support rollers 11 and 13, the same effect as described above can be obtained.

By configuring the roller rotation mechanism 30 as described above, the leading end of the unused stretch film roll can be adhered to the stretch film roll via the support roller 13, for example, so that the film can be used next time. It becomes easy to feed out. In addition, since the load on the drive source is small,
A small motor with small capacity can be used as the drive source.

Further, in FIG. 1a, 39 is a lever mechanism for rotating the rotating mechanism frame 31 about the pivot shaft 36, and 40 is a brake mechanism for applying braking to the support roller 13. The lever mechanism 39 and brake mechanism 40 will be explained below.

FIG. 3 is a partially plan view showing the lever mechanism 39, and FIG. 4 is a partially sectional side view showing the lever mechanism 39 and the brake mechanism 40. As shown in the figure, the lever mechanism 39 includes a rotating lever 39b and an engaging member 39a that engages and fixes the rotating lever 39b in a predetermined position.
is fixed to the side surface of the packaging machine frame 15. The tip of the rotating lever 39b is fixed to the pivot shaft 36, and by rotating the rotating lever 39b clockwise or counterclockwise about the pivot shaft 36, the rotating mechanism The frame 31 also rotates clockwise or counterclockwise. Further, when the rotating lever 39b is rotated clockwise or counterclockwise, the notch 3 of the engaging member 39a
9a-1 and 39a-2 and are fixed.

FIG. 5 is a partial perspective view showing a portion of the brake mechanism 40. As shown, the brake mechanism 40
has a structure in which a roller 40b is fixed to one side of the tip of a member 40a having an inverted U-shaped cross section, and a round rubber belt 40d is stretched between the roller 40b and the support roller 13, and the rear end of the member 40a is pivoted. axis 40
an engagement protrusion 40f that is rotatably supported by c, and on the other side of the tip, the tip of an adjustment bolt 40e that adjusts the braking force of the brake mechanism 40 abuts;
is provided.

In the brake mechanism 40 configured as described above, by rotating the adjustment bolt 40e and changing its protrusion amount, the member 40a rotates around the pivot shaft 40c, and the roller 40b moves up and down. Thereby, the tension applied to the round rubber belt 40d changes, and the braking force of the brake mechanism 40 can be adjusted. That is, as the tension applied to the round rubber belt 40d increases, the braking force of the brake mechanism 40 also increases, and as the tension decreases, the braking force decreases.

A brake mechanism 40 having the same structure as that described above is provided to apply braking to the support roller 11, but its illustration is omitted. Note that the roller 40
b may be a mechanism that is difficult to rotate.

FIG. 6 is a plan view showing the structure of a film transfer device of a packaging machine and a film feeding mechanism for loading film into the film transfer device.

In the figure, numeral 41 is a film transporting device for transporting the stretch film, which has been unwound from the stretch film roll F1 or F2 and cut into a predetermined length by the cutter 22, along a film transport path; and 42 is a film transport device for transporting the stretch film. This is a film feeding mechanism that loads film into the device.

The film transfer device 41 engages on the outer periphery of a chain conveyor 44 that operates by engaging with a sprocket, and pinches both ends of the film between a round rubber belt 45 that operates in conjunction with the chain conveyor 44. It is equipped with a plurality of grippers 46. Further, on the starting end side of the film transfer device 41, a timing belt 21 is arranged inside the chain conveyor 44 in parallel with the chain conveyor 44, and a minute gap is formed on the upper surface of the timing belt 21 so that the plate A pressing member 48 having a shape is provided. The timing belt 21 is a belt having a shape in which concavities and convexities are provided at regular intervals parallel to the upper and lower surfaces, and is driven by a timing pulley 49 having concavities and convexities on its peripheral surface that fit into the concavities and convexities. Further, the timing pulley 49 rotates in conjunction with a sprocket (not shown) that drives the chain conveyor 44, and the timing belt 21 and the chain conveyor 4
4 are configured to operate synchronously. The film transporting device 41 having the above structure is operated by the film folding mechanism of the packaging machine while the grippers 46 hold both ends of the stretch film which is fed out by the film feeding mechanism 42 and cut to a predetermined length by the cutter 22. (not shown).

The film feeding mechanism 42 includes a film feeding roller 20 and a film guide plate 51. The film feed-out roller 20 is supported by the packaging machine frame 15 through bearings 52 at both ends, and is configured to rotate in conjunction with the chain conveyor 44, and as described above, the film feed-out roller 20 is configured to rotate from the stretch film roll F1 or F2. The film is fed out, passed over the upper surface of the film guide plate 51, and fed between the pressing member 48 and the timing belt 21. The width interval of the film transfer device is adjusted by operating the handle 47 and adjusting the interval between the chain conveyors 44, 44 by a mechanism (not shown).

Next, the operation of feeding the stretch film from the stretch film roll F1 placed on the support rollers 11 and 12 of the film transfer device having the above structure will be explained. The end of the stretch film f1 is pulled out from the stretch film roll F1, guided through the lower surface of the support roller 11 onto the film feed roller 20, and stretched onto the timing belt 21 through the surfaces of the film feed roller 20 and the guide plate 51. Place the end of the film f1. The end of the stretch film f1 is held between the timing belt 21 and the pressing member 48. When the timing belts 21, 21 are driven by the rotation of the chain conveyors 44, 44, the timing belts 21, 21 are fed out to a predetermined length and cut by the cutter 22, and the two ends thereof are held by the rubber belts 45, 45 and the grippers 46, 46 and transported. .

At this time, as mentioned above, the interval between the film transfer devices 41 is set in advance by operating the handle 47 according to the width of the stretch film roll F1.
The amount of both ends of the stretch film gripped by the grippers 46, 46 is determined depending on the width of the stretch film. That is, when a strong stretching force is applied to the stretch film and its width becomes narrow, the amount that can be held by the grippers 46, 46 becomes small, and conversely, when the stretching force is weak, the width is widened and the amount of gripping is reduced. The amount of water will increase. Therefore, in the structure of the film supply section of the film roll fixing device of the packaging machine previously filed by the present applicant, the tension applied to the stretched stretch film is different at the beginning and end of the stretch film roll. , as the end of the stretch film roll approaches, the grippers 46, 46
The amount of stretch film held in the
However, when the stretch film covering the object to be packaged is folded in by the film folding mechanism, it is difficult to remove the stretch film from the grippers 46, 46, which adversely affects the finished packaging. However, in the embodiment described above, since the support roller 11 or 13 is rotated in conjunction with the film feeding roller 20, the tension applied to the stretch film fed out from the stretch film roll F1 or F2 remains constant. Therefore, the amount of stretch film held by the grippers is constant, and the amount of stretch film that comes off from the grippers is also constant, so that a package with a beautiful packaging finish can be obtained.

Furthermore, since the support rollers 11 and 13 are braked by the brake mechanism 40, the inertia of the stretch film rolls F1 and F2 can be reduced when the film stops being fed out.
This prevents the stretch film from loosening and eliminates problems such as adhesion between the stretch film and the stretch film roll.

Furthermore, by making the rotational speed of the support roller 11 or 13 slightly slower than the rotational speed of the film feed roller 20, a constant tension can always be applied to the stretch film, making it possible to make the wrapping more beautiful. Become.

In addition, in the above embodiment, the support rollers 11, 12,
Of the support rollers 13 and 14, only the support rollers 11 and 13 are rotated, but it is possible to rotate all the support rollers 11 and 1.
It goes without saying that 2, 13, and 14 may be made rotatable.

[Effect of idea]

As explained above, according to the present invention, the following effects can be obtained.

A belt is provided that transmits rotational force in conjunction with the rotation of the film feed roller, and one stage of the support rollers arranged in multiple stages is selected by rotating around a pivot shaft by a lever, and at least one of the support rollers is rotated by a lever. Since a rotational force transmission mechanism that presses the belt and transmits the rotational force of the belt to the driving pulley of the support roller is provided, the stretch film unrolled from the stretch film roll selected by the rotational force transmission mechanism is always A constant tension is applied, the width of the stretch film becomes constant, and there is no need to adjust the distance between the film transfer mechanism, which transfers the stretch film by holding both ends of the stretch film with grippers, and there is no waste of stretch film due to distance adjustment. Moreover, it is economical because the stretch film on the stretch film roll can be used until the end.

Since the braking force is applied to the support roller by the brake mechanism, the inertia of the stretch film roll can be reduced when the film stops being fed out, so the stretch film does not loosen and the stretch film and stretch film roll are kept together. There is no need to glue.

By making a difference in the rotational speeds of the support roller and the film delivery roller, it is possible to always apply a constant stretching force to the delivered stretch film, thereby making it possible to improve the finish of the packaging.

[Brief explanation of the drawing]

1a and 1b are diagrams showing the structure of a film feeding device in a packaging machine according to the present invention, in which FIG. 1a is a front view of the film feeding device, FIG. 1b is a side view thereof, and FIG. filed the application first (Jet No. 60-
No. 02406) A diagram showing the structure of the film supply part of the film roll fixing device, FIG. 3 shows the lever mechanism 39.
FIG. 4 is a partial plan view showing the lever mechanism 3.
5 is a partial perspective view showing the brake mechanism 40, and FIG. 6 shows the structure of the film transfer device and film feeding mechanism of the packaging machine. FIG. In the figure, 11 to 14... Support roller, 15... Packing machine frame, 16, 17... Support member, 18, 1
8', 19, 19'... stopper plate, 20... film feeding roller, 21... timing belt, 22... cutter, 30... roller rotation mechanism, 31... rotation mechanism frame, 32, 33... Large diameter guide roller, 34, 35...Small diameter guide roller, 3
6... Pivot shaft, 37... Round rubber belt, 39...
Lever mechanism, 40...Brake mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) Two supporting rollers arranged in parallel with a predetermined interval are arranged in multiple stages, and each of the supporting rollers is mounted on the two supporting rollers arranged in the plural stages. A packaging machine configured to feed stretch film selectively unrolled from a plurality of stretched film rolls placed therein via a single film unwinding roller to a film transport mechanism that transports stretch film while holding both ends with grippers. In the film feeding device, a belt is provided which transmits rotational force in conjunction with the rotation of the film feeding roller, and the belt is rotated about a pivot shaft by a lever to feed one of the supporting rollers arranged in the plurality of stages. 1. A film feeding device for a packaging machine, comprising a rotational force transmission mechanism that selects a stage, pushes out the belt to a driving pulley of at least one of the support rollers, and transmits the rotational force of the belt. (2) Utility model registration claim No. (1) characterized in that the support roller is provided with a brake mechanism.
A film feeding device for the packaging machine described in 1. (3) The film feeding device for a packaging machine according to claim 1, wherein the rotational speed of the support roller is slower than the rotational speed of the film feeding roller.