JP2509270Y2 - Film gripper device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film holding device. More particularly, it relates to an improved film gripper device in an automatic stretch wrapping machine.

[0002]

2. Description of the Related Art Conventionally, an elastic plastic film having at least one side having an adhesive property is automatically wound around a package loaded on a pallet while being tensioned.
An automatic spiral stretch wrapping machine for wrapping the article to be wrapped is known.

For example, Japanese Utility Model Laid-Open No. 57-95302 discloses a rotary table which automatically rotates at a preset position after it has been rotated by a preset number of revolutions, and is independent of the rotary table on a base frame. In a spiral pallet stretch wrapping machine equipped with a stanchion provided and a film elevating frame that can descend after rising in a range of strokes set along the stanchion and set the rising and lowering speeds separately. The film is closed on one side of the rotary table so as to project from the upper surface of the rotary table, and the film end is sandwiched, and when the rotary table rotates, the film is opened so as not to project from the upper surface of the rotary table at a set timing. A gripper that opens the end is provided and is provided on the base frame so as to face the rotary table. Immediately afterwards, the film pressing roller and the film are rocked with a rocking radius capable of coming into contact with the side surface of the object to be packaged so that the film is attached to the object to be packaged and a part of the film is moved to a position where the gripper is held. Disclosed is a spiral stretch wrapping machine provided with a cutter which lags behind a pressing roller and swings with a smaller oscillating radius to cut a film sandwiched between the film pressing roller and the gripper by the gripper. .

Further, for example, Japanese Utility Model Publication No. 63-35921 discloses an improved automatic spiral type stretch wrapping machine. FIG. 6 is a perspective view of the conventional automatic spiral type stretch wrapping machine shown in FIG. 2 of the publication, and FIG. 7 is a perspective view of the conventional automatic spiral type stretch wrapping machine shown in FIG. 4 of the publication. FIG. 2 is an enlarged view showing a side surface of a rotary table provided with a gripper, in which reference numeral 1 is a base frame, 2 is a rotary table, 3 is a film roll, 4 is a film, 5 is a lifting frame, 6 is a frame, and 7 is a brake. A device, 8 is an object to be packaged, and 9 is a gripper.
FIG. 8 is an enlarged plan view of the gripper portion of the conventional automatic spiral type stretch wrapping machine shown in FIG. 4 of the publication, in which reference numeral 2 is a rotary table, 9 is a gripper, and 3 is a gripper.
1 is a gear, 32 is a lever, 33 is a connecting rod, 34 is an air cylinder, 35 is a frame, 36 is a guide rail,
Reference numeral 37 is an air cylinder, 38 is a stopper frame, and FIG. 9 is an enlarged side view of an essential part of the gripper portion viewed from the direction of the arrow in FIG. 8, and the same reference numerals as those in FIG.

First, referring to FIGS. 6 and 7, the operation of the automatic spiral type stretch wrapping machine described in the above-mentioned publication will be briefly described. In the automatic spiral type stretch wrapping machine shown in FIG. 6, the gripper 9 is provided on the side edge portion of the rotary table 2, and the object to be wrapped 8
Is placed at a predetermined position on the turntable, the turntable 2 starts rotating in the direction of the hands of the clock when viewed from above,
After half to two and a half turns, the gripper 9 turns the turntable 2
(See the gripper shown by the dotted line in FIG. 7) so that it does not protrude from the upper surface of the film to open the end of the film. Then, the elevating frame 5 rises along the frame 6 to a position where the upper end of the film roll 3 is slightly higher than the height of the article to be packaged, and the film 4 is spirally wound around the article to be packaged. During this time, the brake device 7 applies tension to the film. The elevating frame rises to a predetermined height and then descends,
At the same time it descends to the initial position, the rotary table
When the gripper reaches the position shown in FIG. 6, it stops rotating. Then, the film pressing roller 10 provided on the base frame 1 swings to apply the film to the side surface of the packaged object, and the gripper 9 closes to clamp the lower end of the film 4 by the gripper 9. The film held between the press roller 10 and the gripper is cut by the cutter 11 which oscillates with a small oscillating radius after the film press roller 10 lags.

Next, the improved automatic spiral type stretch wrapping machine described in Japanese Utility Model Publication No. 63-35921 will be described with reference to FIGS. 8 and 9. In the automatic spiral type stretch wrapping machine shown in FIG. 6 and FIG. 7, when the size of the object to be wrapped is smaller than one side of the rotary table, since the gripper is provided at one side edge of the rotary table. , When the gripper is opened during the packaging and the lower end of the film is opened, the film part held by the gripper hangs from the lower part of the package and is not only unclean, but also an obstacle. Since there was a problem, the problem was solved in Figure 8
And the automatic spiral stretch wrapping machine shown in FIG.

This stretch wrapping machine is different only in the mounting position of the gripper 5 and its operation. That is, the gripper 9 is provided inside the rotary table at a position closer to the center of the rotary table of the frame 35, and the frame 35 is installed on the guide rail 36 so as to be movable toward the center of the rotary table. There is. When the object to be packed is placed on the rotary frame and the packing is started, the stopper frame 38 is moved toward the center of the rotary table by the operation of the air cylinder 37 while the lower end of the film is held by the gripper. The packaging is started until it reaches the side wall of the packaged object, and the gripper 9 is brought as close to the packaged object as possible.
As described with reference to FIG. 6, the lower end of the film is clamped by the gripper 9, and after the film is cut, the gripper is moved to the outer side of the rotary table by the operation of the air cylinder 37. Reference numerals 31 to 34 indicate devices for opening and closing the gripper 9.

In the stretch wrapping machine having such a structure, when the object to be wrapped is wrapped, conventionally, the film is wound using the brake device 7 (see FIG. 6) in a tensioned state by utilizing its elasticity. Conventional type was used, but resource saving has been required in recent years.
The pre-stretch type so-called roll type film pre-stretching automatic spiral stretch wrapping machine shown in FIG. FIG. 10 is a perspective view of an automatic spiral stretch wrapping machine of a film pre-stretching system by a pre-stretching roll system, in which 1 is a base frame, 2 is a rotary table,
3 is a film roll, 4 is a film, 5 is a film lifting frame, 6 is a gantry, 8 is an object to be packaged, 9 is a gripper,
10 is a film pressing roller, 11 is a cutter, 13 is a low speed roll, 14 is a high speed roll, 15 is a tension, 1
6 is a guide roll, 17 is a drive unit, and 18 is a motor.

The film 4 drawn out from the film roll 3 is arranged so as to face each other, and is driven by a motor 18 via a drive unit 17 to a low speed roll 13 and a high speed roll 1.
4 is pre-stretched. For both rolls, a rubber roll is used and the surface is roughened so that slip does not occur on the roll surface with which the film 4 is in contact when driven. Usually, the speed ratio between the low speed roll 13 and the high speed roll 14 is set to 2-3 times, and the film 4 is pre-stretched between both rolls according to the speed ratio amount. The stretched film 4 is wound around the article to be packaged through the tension rolls 15 and the guide rolls 16. At this time, the film 4 detects the tension between the high speed roll 14 and the article 8 to be packaged by the tension roll 15. ,
Packaging is performed while changing the rotation speed of the high-speed roll 14 to control the winding tension.

In the pre-stretch type stretch packaging, a film having a film thickness of 20 to 30 μ is usually used, but it becomes extremely thin because it is stretched 2 to 3 times in a pre-stretching process, and the conventional automatic spiral type is used. The gripper 8 used in the stretch wrapping machine takes a lot of time to adjust the holding surface or holds the film, but holds the film when the rotary table starts rotating or when the gripper slides. There were often problems that the pressure applied was too strong to cut the film, or the film was removed when the holding pressure was weak.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its purpose is to use a pre-stretch type automatic spiral stretch packaging, which is so-called stretch. In order to respond to the thinning of the film, the purpose is to
It is an object of the present invention to provide a film gripper device having an extremely simple mechanism in which when a film is gripped by a film gripper, the film is tucked up and then clamped.

[0012]

DISCLOSURE OF THE INVENTION The present invention provides a rotary table that automatically rotates at a set position after rotating by a set number of rotations, and a rack provided on a base frame independently of the rotary table. In a stretch wrapping machine equipped with a column and a film elevating frame that ascends and descends within a range of strokes set along the gantry, at the side edge of the rotary table, the upper surface of the rotary table when the rotary table is stopped. A film sandwiching device that holds the cut end of the film by closing it so that it protrudes more, and opens it so that it does not project from the upper surface of the rotary table at a set timing when the rotary table rotates. When the cut end of the film is clamped, the fulcrum on the link mechanism is raised according to the closing of the gripper. The clamping end so as to sandwich after Takushiage toward the center of the film, a film gripper and wherein the fulcrum on the link mechanism up and down.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the accompanying drawings showing a specific example thereof, but the present invention is not limited thereto. In addition, only the main parts are shown in each drawing for easy understanding. 1 is a front view showing a specific example of the device of the present invention, in which the film gripper device is open, FIG. 2 is a film gripper device in the closed state, and FIG. 3 is a part 81a and 81b of FIG. The figure which looked at from above is shown. Further, the automatic spiral stretch wrapping machine shown in FIG. 4 is essentially the same as that shown in FIG. 10 in the structure and operation of each component except the film gripper device 9. In addition, in these figures, reference numerals 1 to 17 have the same meanings as in FIG.

The film gripper device of the present invention is attached to a pair of rotating shafts. Note that, for example, as shown in FIG.
Similar to the gripper device of FIGS. 7 and 8 used in the automatic spiral stretch wrapping machine shown in FIG. 10, it suffices to select and attach an appropriate position.

Next, the present invention will be described in detail with reference to FIGS. 1 and 2. The gripper device of the present invention is shown in FIG.
Is attached to the rotary table 2 shown in FIG. A pair of rotating shafts 84a and 84b are attached symmetrically on a base 86 on the frame, and levers 85a and 85b are fixed to the rotating shafts, and levers 81a and 81b are attached to pins 83a and 83b at the tips thereof.
Is attached, the pair of left and right levers are connected by the connecting pin 82, and the pair of rotating shafts are interlocked and rotated in opposite left and right directions. The connecting pin 82 moves up and down by the rotating operation. When the connecting pin 82 is lowered to the position shown in FIG. 1, the grippers 81a and 81b are opened, and in this state, the film end is set to be near the connecting pin, and the connecting pin 82 is set to the position shown in FIG. Gripper 81a when rising,
81b is set to close and pinch the film, and the lower end of the film is lifted up by the connecting pin 82 and the grippers 81a and 81b in accordance with the closing operation, and finally pinched completely, that is, in the state of FIG. Sandwiching is completed.

When used as a link mechanism in the film gripper device of the present invention for a gripper mechanism of a well-known spiral stretch wrapping machine conventionally used, it may have a shape as shown in FIG. 5 if necessary. That is, FIG. 5 shows a front view, and reference numerals 81c and 81d.
Is a guide rod, 82 is a connecting pin, 83a and 83b are pins, 8
Reference numerals 4a and 84b denote rotating shafts, and 9 denotes a gripper. The link mechanism used in the film gripper device of the present invention can thus be easily attached to the conventional film gripper device, and can be used in place of the conventional film gripper device of the spiral stretch packaging machine. Even when attached, the linking pin 82 and the guide rods 81c and 81d ascend and descend due to the operation of the pair of rotating shafts by the same action, and the lower end portion of the film has the connecting pin 82 and the stabilizing rods 81a and 81b. It is lifted up and pinched. Further, since the timing of this operation is not different from that of the conventional film gripper 9, detailed description will be omitted.

[0017]

In the above description, the case where the film gripper device of the present invention is applied to a pre-stretch type automatic stretch wrapping machine has been described.
From the viewpoint of resource saving, when using a thinner film,
The present invention can be applied to the pre-stretch type automatic stretch wrapping machine described with reference to FIGS. 6, 8 and 9, and its utility is extremely large.

[Brief description of drawings]

FIG. 1 shows an embodiment of the film gripper device of the present invention, in which the gripper device is in an open state.

FIG. 2 is a drawing showing a state in which the gripper device of the present invention shown in FIG.

3 is a top view of the grippers 81a and 81b of FIG. 2;

4 is a perspective view showing an example of a pre-stretch type automatic spiral type stretch wrapping machine to which the gripper device shown in FIG. 1 of the present invention is applied.

FIG. 5 is a view showing an embodiment in which the present invention is applied to a conventional gripper device.

FIG. 6 is a schematic perspective view showing an example of a conventional automatic spiral stretch wrapping machine.

FIG. 7 is a view for explaining a gripper mounting portion of the automatic spiral stretch wrapping machine shown in FIG. 6 and an operation thereof.

FIG. 8 is a plan view for explaining a mounting position of a gripper of a type different from that shown in FIG.

9 is a schematic front view of the gripper device shown in FIG.

FIG. 10 is a schematic perspective view of an example of a conventional pre-stretch type automatic spiral type stretch wrapping machine.

[Explanation of symbols]

1 base frame, 2 rotary table, 3 film roll, 4 film, 5 film lifting frame, 6
Frame, 7 Electromagnetic brake, 8 Packaged object, 9 Gripper device, 10 Film pressing roller, 11 Cutter, 12 Air cylinder, 13 Low speed roll, 14
High speed roll, 15 tension roll, 16 guide roll 17 Drive unit, 18 motor, 31 gear, 32 lever, 33 connecting rod, 34 air cylinder, 35 frame, 36 guide rail, 37
Air cylinder, 38 stopper frame, 81
a, 81b gripper, 82 connecting pin, 83a, 8
3b pin, 84a, 84b rotating shaft, 85a, 85b
Lever, 86 base, 87 mounting frame

Claims (1)

(57) [Scope of utility model registration request] 1. A rotary table that automatically stops at a set position after rotating by a set number of rotations, a gantry provided on a base frame independently of the rotary table, and along the gantry. In a stretch wrapping machine equipped with a film elevating frame that ascends and descends within a set stroke range, the film is closed at the side edge of the rotary table so as to project from the upper surface of the rotary table when the rotary table is stopped. A film clamping device for clamping the cut end of the film and opening it so as not to project from the upper surface of the rotary table at a set timing when the rotary table rotates, and the film cut end is formed. When the portion is clamped, the fulcrum on the link mechanism rises in accordance with the closing of the gripper so that the clamping end portion of the film is moved by the fulcrum. A film gripper device in which a fulcrum on a link mechanism moves up and down so that the film is tucked up toward the center of the film and then pinched.