JPS5828168B2 - Automatic operation preparation device for stretch wrapping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic operation preparation device for a stretch wrapping machine.

Conventionally, there are various types of stretch wrapping machines of this type, but among these, the items to be packaged are pushed into a stretched film, wound into a tube with the film, and after the edges of this film are pulled, the bottom surface is wrapped. There are some that can be folded and packaged.

This type of stretch wrapping machine can wrap items of various sizes with a film of the same width, but when the sizes are different, a stretch wrapping machine that pushes the items into the film is used. It is necessary to change the amount of protrusion of the pusher claws and to adjust the interval between the wrapping parts for pulling and folding the film edges.

Conventionally, all such adjustments have been made manually, and there is a problem that even the slightest deviation in the dimensions makes it impossible to perform smooth packaging operations, and the preparation work associated with changing the size of the packaged items is extremely time consuming. It is time-consuming and difficult.

The present invention was developed in view of these points, and is an automatic stretch wrapping machine that can automatically adjust each part to be adjusted by simply specifying the size of the object to be wrapped, thereby simplifying the preparation work. The purpose is to obtain an operation preparation device.

In the present invention, a film is wound around an object to be wrapped in a tube, and the edges on both sides of the tube-wound film are folded back for packaging. A pair of holding frames are provided with film pushing claws whose protrusion amount changes depending on the length, and a stretch plate for stretching the ears and a folding plate for folding the ears are attached to the width dimension of the item to be packaged. and a control unit that sets the protrusion amount of the film pushing claw and the interval dimension of the holding frame to predetermined values by setting the dimensions of the object to be packaged. It is characterized by the following.

An embodiment of the present invention will be described based on the drawings.

First, what is shown in FIG. 1 schematically shows a stretch wrapping machine 1, which includes a main body 3 held by legs 2,
A pusher 5 for pushing a tray 4 serving as an object to be packaged is provided on the front side of the main body 3 so as to be horizontally reciprocated.

Film holding parts 7 and 8 are provided at the upper and lower parts of the main body 3 for winding and holding the film 6 in the form of a roll. It is guided by guide rollers 9 and is fused at the middle.

Next, a film welding/cutting device 10 is provided.

As shown in FIG. 2, this film welding/cutting device 10 consists of two pedestals 11 provided in a fixed position, a film presser 12 that moves up and down, and a heat cutting device 13 that moves up and down from between the pedestals 11. Become.

At the rear of the film welding/cutting device 10, a carry-in chino 14, a discharge chino 15, and a heat sealing device 16 are provided, and a packaging section 17 is provided below the discharge chino 15.

Details of this packaging section 17 will be described later.

The pusher 5 is formed as shown in FIG.

That is, a motor 20 is mounted on a pusher plate 19 whose front edge is a pressing edge 18 that joins to the tray 4, and a worm wheel 24 of a shaft 23 held by a bracket 22 is attached to a worm 21 attached to the motor 20. They are interlocked.

A pinion 25 is formed at both ends of this shaft 23.

A film pushing pawl 27 is provided on a guide portion 26 integrally formed with the pusher plate 19 so as to be movable forward and backward.

These film pushing claws 27 are guided by two guide pins 29 that fit into elongated holes 28, and a rack 30 erected on the side thereof is engaged with the pinion 25.

Further, a frame 31 is attached to the pusher plate 19, and this frame 31 includes a detector 33 that faces a detection magnet 32 provided on the worm 21, and a detection magnet 35 of a detection wheel 34 fixed to the shaft 23. A detector 36 facing the is provided.

Then, as shown in FIGS. 4 to 6, the packaging section 1 is
7 is provided.

First, the tray 4 sent in by the carry-in cheno 14
In this case, the film 6 is wound into a tube, and gripping and conveying sections 38 for pinching the edges 37 of the film 6 are provided on both sides, and inside these gripping and conveying sections 38, there are two pairs of gripping and conveying sections 38 each. A stretch plate 39 and a folding plate 40 are provided.

Each of the stretch plate 39 and the folding plate 40 on one side is attached to a holding frame 41.

These holding frames 41 are held by driving screw shafts 43 and 44 each having threaded portions 42 having different lead angle directions.

In particular, the drive screw shaft 44 is screwed to the holding frame 41 via a bracket 45 fixed to the holding frame 41.

Further, a protruding piece 46 is formed on one of the holding frames 41, and two limit switches 47 are provided on both sides of the protruding piece 46 at a predetermined interval.

Next, sprocket wheels 48 are fixed to the drive screw shafts 43 and 44, and a check 751 is suspended between these sprocket wheels 48 and a sprocket wheel 50 attached to a motor 49.

Further, a detection wheel 53 having a detection magnet 52 is fixed to the drive screw shaft 43.
A detector 54 is provided close to 3.

Next, what is shown in FIG. 7 is a control section 55, which has an operation surface 56 on its surface and is provided with a control circuit (not shown) inside.

The operation surface 56 has operation buttons 57 for setting the dimensions of the tray 4 and a display window 58 for indicating that preparation is complete.
It is becoming more and more.

In such a configuration, the state in which normal packaging work is performed will first be described.

The tray 4 is inserted so that the film 6 is pushed in by the pusher 5, whereby the film 6 is wound into a cylinder as shown in FIG.

Then, the film presser 12 descends and presses the doubled film 6 with the pedestal 11, and the heat cutting device 13
rises to weld and cut the film 6.

That is, the edges of the film 6 on the tray 4 side are welded,
On the other hand, the upper and lower edges are welded and the two are separated.

Then, the tray 4 is sent into the packaging section 11 by the carry-in cheno 14. First, the selvage 37 of the film 6 is gripped by the gripping and conveying section 38, and the stretch plate 39 is joined to the selvage 37 in the process of being fed 5. However, since the upper edge of the stretch plate 39 is successively higher, the film 6 is pulled laterally.

Then, the folding plate 40 is joined to the ear portion 37, and the ear portion 37
Fold inward.

At this time, since the gripping force of the gripping and conveying unit 38 is weaker than the strength of the film 6, the gripping force of the gripping and conveying unit 38 is gradually released, the ear portion 37 is pulled out, and the entire ear portion 37 is attached to the bottom surface of the tray 4. completely folded in.

The tray 4 packaged in this manner is transferred onto the heat sealing device 16 and welded, thereby being completely packaged.

In this way, the trays 4 are wrapped one after the other, but even if the width of the film 6 is constant, trays 4 of various sizes can be wrapped.

Generally, the width and length of the tray 4 are often set to several different sizes, and in such cases, the size of each operation button 57 is memorized. The operation is simple if you set the button so that a predetermined size signal is output when the button is pressed.

For example, the size of tray 4 is 150 mm in width and 1 in length.
00 mm, when the corresponding operation button 57 is pressed, a corresponding size signal is output and transmitted to the motor 20 and the motor 49.

First, regarding the motor 20, the detection wheel 34 is rotated in reverse at first, and the point where the detection magnet 35 is detected by the detector 36 is set as the zero point, and the motor 20 starts rotating forward, and the detection magnet 35 provided on the worm 21 is rotated in the normal direction. The detector 33 counts and rotates until the length corresponds to 100 mm.

As a result, the pinion 25 rotates and the film pushing pawl 27
advances by a predetermined dimension.

The amount of protrusion of these film pressing claws 27 is preferably such that the dimension from the pressing edge 18 to the tip is 105 m4 degrees, and that they slightly protrude from the tray 4.

As a result of this setting, when the film 6 is pushed in, the film pushing claw 27 pushes the side of the film 6 and pushes the film 6 into the tray 4.
To avoid placing any burden on the film and to make the film roll smoothly.

Note that even if a load is applied to the film pushing pawl 27, it is locked and does not move because there is an engaging portion between the worm 21 and the worm wheel 24 in the power transmission path.

Next, regarding the motor 49, the drive screw shaft 43.
44 to return the holding frame 41 to the reference position.

This reference position is detected when the protruding piece 46 comes into contact with the limit switch 47, and the motor 49 is rotated in reverse from this position.

The amount of movement due to the rotation is determined by the detector 54 detecting the detection magnet 52 of the detection wheel 53.
When the point corresponding to the width dimension of 150 mm is reached, motor 4
9 stops.

Therefore, the stretch plate 39 and the folding plate 40 are
The film 6 is positioned at a fixed position from the side edge of the film 6, and the tabs 37 of the film 6 are pulled and folded back in a fixed manner, thereby achieving uniform packaging.

In this manner, when the setting that matches the length and width of the tray 4 is completed, a display window 58 of the control section 55 displays a message indicating that preparation is complete.

Although the details of the electric circuit will not be explained in particular, it is easy to perform the above operation by applying a known circuit.Especially, since the dimensions are set after returning to the zero position, the circuit configuration It also becomes easier.

Further, the control section 55 can be made extremely compact by using a microcomputer, and can be easily added to the main body 3.

According to the present invention, by simply setting the size of the object to be packaged on the control unit as described above, the projecting amount of the film pushing pawl in the pusher can be set, and the interval dimension of the holding frame equipped with the stretch plate and the folding plate can be set. The settings can be made automatically, thereby shortening the preparation time and making the work easier, and it is extremely easy to change the size of the packaged item.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a vertical side view of a stretch wrapping machine, FIG. 2 is a vertical side view of a part of the machine, FIG. 3 is a perspective view of a pusher, and FIG. 4 is a vertical side view of a stretch wrapping machine. A plan view of the packaging section; Figures 5a, b, and c are front views showing the packaging process; Figure 6 is a front view showing the packaging process;
The figure is a perspective view of a part of the packaging section, and FIG. 7 is a perspective view of the control section. 4...Tray (packaged item), 5...Pusher, 6...Film, 27...
Film pressing claw, 37...Ear part, 39...
...Stretch board, 40...Folding board, 41...
. . . Holding frame, 55 . . . Control unit.

Claims (1)

[Claims] 1 In a case where a film is wrapped around an object to be packaged and the edges on both sides of the tube-wrapped film are folded back for packaging, a pusher that pushes the object to be packaged toward the film has a length of the object to be packaged. A pair of holding frames, to which a stretch plate for stretching the ears and a folding plate for folding the ears are attached, are provided with film pushing claws whose protrusion amount changes according to the width of the object to be packaged. A control unit is provided to adjust the interval, and to set the protrusion amount of the film pushing claw and the interval dimension of the holding frame to predetermined values by setting the dimensions of the object to be packaged. Automatic operation preparation device for stretch wrapping machine