JP2772946B2 - Control method of film cutting unit for unpacking machine of film package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a film cutting unit for a film package unpacking machine. The present invention relates to an improvement in a control method of a film cutting unit for cutting a stretch film from a lower end to an upper end.

[0002]

2. Description of the Related Art Conventionally, as an unpacking machine for a stretch package in which articles to be packaged on a pallet are wrapped with a stretch film, Japanese Unexamined Patent Publication No. Hei.
No. 26, Japanese Unexamined Patent Publication No. 6-8926 has been proposed, and as an unpacking machine for both a stretch wrapper and a shrink wrapper, there is also a specially disclosed application of the present applicant. No. 6-173155, Japanese Patent Application No. 6
Proposals have been made as described in Japanese Patent Application No. 335442 and Japanese Patent Application No. 7-97592.

When unpacking a stretch package using the unpacking machine disclosed in these publications and specifications, the lower end of the stretch film wound around the packaged object (that is, the side surface) is gripped by a lower end gripper. The film that has been nipped and pulled out is nipped from the front and back with two pairs of nipping rollers of the cutting unit from below, and while rotating these nipping rollers, the cutting unit is moved along the front column at the same speed as the peripheral speed of the nipping rollers. Raise and cut the stretch film upward from the lower end. Then, the cutting unit temporarily stops before completely cutting the stretched film, and the upper gripper attached to the tip of the swing arm that unfolds the cut film descends to hold the upper end of the film being cut. I do. The cutting unit then rises to the top of its stroke, cutting the film completely. The cutting unit immediately descends, and the two swinging arms swing left and right with the upper gripper attached to the tip holding the upper end of the film, and move the cut film left and right from the cutting line. It is to open the door.

[0004]

However, most stretch wraps have a top surface covered with a film (top cover film) larger than the top surface before stretch wrapping. A stretch film is wound around the side and packaged. However, the top cover film that hangs down on the side of the package and the stretch film that is wrapped under tension from above adheres to the package, preventing the cutting unit from rising, and the upper gripper being attached to the side of the package. A problem sometimes arises that the top end of the stretch film cannot be pinched because it is not inserted between the hanging top cover film and the stretch film wound thereon. The present invention has been made in view of such circumstances, and the problem is to determine the close contact between the above-described top cover film and the stretch film wound thereon before the cutting unit cuts the portion. An object of the present invention is to provide a method of controlling a film cutting unit for an unpacking machine for a film package, which can be eliminated.

[0005]

In order to solve the above-mentioned problems, a method of controlling a film cutting unit for an unpacking machine for a film package according to the present invention is to cover a top surface of an object loaded on a pallet with a film. Further, the package is formed by cutting the stretch film on one side from the lower end to the upper end, and opening the film left and right to open the package. A pair of holding rollers for holding the stretch film from the front and back, and a cutter for cutting the film, which are used for an unpacking machine for a package, and are provided at a peripheral speed of the holding rollers along a column opposed to the side surface. A method for controlling a film cutting unit to move up and down, wherein the film cutting unit is moving upward from a lower end of its stroke while rotating the holding roller. Stopping the cutting unit at a preset position and continuing to rotate the holding roller for a set time, and then stopping the holding roller to raise the film cutting unit for the stop time. It is characterized by.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, the film cutting unit is temporarily stopped below the lower end of the top cover film hanging down on the side surface of the packaged object, and the holding roller is continued for a set time. By rotating, the stretch film hangs down. Next, while stopping the rotation of the sandwiching roller,
By raising the film cutting unit by the stop time, the film which has been lowered downward is lifted to a position where the upper gripper attached to the tip of the swing arm can be lowered to hold the upper end of the stretch film. In this way, the effect of eliminating the close contact between the top cover film and the stretch film wound thereon is achieved. This also achieves the effect that the film cutting unit rises smoothly and the upper gripper securely clamps the upper end of the stretch film.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the method of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a side view of a film package unpacking machine for carrying out the method of the present invention, and FIGS. 2, 3 and 4 are partially enlarged views for explaining the operation of a cutting unit of the apparatus of FIG.
Each figure shows the state of each stage of operation.

In the drawing, reference numeral 1 is a base frame, 2a is a front support, 2b is a rear support, 3 is a conveyor, 4 is a packaged object, 5a is a stretch film, and 5b is a top support.
A cover film, 6 a package holding plate, 7 a cutting unit, 7a and 7b holding rollers, 7c a hot wire knife,
7d is a drive belt, 8 is a lower gripper, 9 is a carriage, 10 is an upper gripper, 11 is a swing arm, 12
Is a used film discharging device, 20, 21 and 22 are drive motors, and 41, 42 and 43 are proximity switches. The apparatus having the configuration shown in these drawings is disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-253.
626 is the same as that shown in FIG. 2 and FIG. 6, and a detailed description thereof will be omitted.

In this embodiment, the lower end of the stretch film 5a covering the side surface of the package 4 transported by the conveyor 3 to the unpacking position is held by the lower gripper 8,
Removed from package. Next, the cutting unit 7 ascends from below and holds the stretch film 5a held by the lower gripper 8 and separated from the packaged object 4 from the front and back. Then, the cutting unit 7 is raised along the front column 2a by a chain (not shown) driven by the drive motor 21, and at the same time, the stretch film 5a is cut upward from the lower end by the hot-wire knife 7c (FIG. 1, see FIG. 2). On the other hand, as shown in FIG. 2, the nipping rollers 7a and 7b are driven by the driving motor 22 via the driving belt 7d, and rotate at the same peripheral speed as the rising speed of the cutting unit 7. The process so far is
There is no difference from the operation of the apparatus described in each of the above publications and specifications as the prior art.

The cutting unit 7 is stopped by the proximity switch 42 at an appropriate position before the holding rollers 7a and 7b press the lower end of the top cover film 5b hanging on the side surface of the packaged object 4. 7
a and 7b are driven by a drive motor 22, and continue to rotate for a time set appropriately based on experience in order to eliminate the close contact between the stretch film 5a and the top cover film 5b. Go down by a predetermined length. When the set time has elapsed, the drive motor 22 stops and the nipping roller 7
a and 7b stop rotating. On the other hand, the drive motor 21 starts and raises the cutting unit. The time when the cutting unit rises is the same as the time when it first stopped, so that the upper gripper 10 attached to the tip of the swing arm 11 holds the upper end of the stretched-down stretch 5a. Lower and raise to a position where it can be clamped.

As described above, when the upper gripper 10 grips the upper end of the stretch film 5a, the gripping rollers 7a and 7b start rotating again, the cutting unit 7 further rises, and the remaining portion of the stretch film 5a. , The swing arm 11 swings, and the stretch film 5a cut in the vertical direction is opened right and left.
This step is the same as that in any of the devices described in the publications and specifications described above as prior art. An apparatus for performing the method of the present invention is described in JP-A-4-253626,
JP-A-6-8926 and Japanese Patent Application No. 6-17315
5, Japanese Patent Application No. 6-335442 and Japanese Patent Application No. 7-97.
The invention can be applied to any of the unpacking machines described in each specification of No. 592. The cutting unit is disclosed in JP-A-6-89.
26 or the type described in Japanese Patent Application No. 6-250147, and the lower gripper may be of the type described in Japanese Patent Application No. 7-151116. It may be.

[0012]

According to the method of the present invention, the film cutting unit is temporarily stopped below the lower end of the top cover film hanging down on the side of the packaged object, and the holding roller is continuously rotated for a set time. With this, the stretch film is lowered downward. Next, while stopping the rotation of the sandwiching roller and raising the film cutting unit for the stop time, the upper gripper attached to the tip of the swing arm descends the stretched film, thereby stretching the film. Raise the top of the film to a position where it can be clamped. In this manner, the close contact between the top cover film and the stretch film wound thereon can be eliminated. This also allows the film cutting unit to rise smoothly, and the upper gripper to reliably hold the upper end of the stretch film.

As described above in detail, according to the present invention, the close contact between the top cover film and the stretch film wound thereon is eliminated before the film cutting unit cuts the portion. Thus, it is possible to provide a method for controlling the film cutting unit that is effective in performing the operation.

[Brief description of the drawings]

FIG. 1 is a side view of a film package unpacking machine for carrying out the method of the present invention.

FIG. 2 is a partially enlarged side view for explaining the operation of the cutting unit of the apparatus of FIG. 1, showing a state in which the cutting unit rises along a front support and temporarily stops at a preset position. FIG.

FIG. 3 is a partially enlarged side view for explaining the operation of the cutting unit of the apparatus of FIG. 1, and is a view showing a state following the state of FIG. 2;

FIG. 4 is a partially enlarged side view for explaining the operation of the cutting unit of the apparatus of FIG. 1, and is a view showing a state subsequent to FIG. 3;

[Explanation of symbols]

1: Base frame, 2a: Front support, 2b: Rear support, 3: Conveyor, 4: Packaged object, 5a: Stretch film, 5b: Top cover film, 6: Packaged object holding plate, 7 : Cutting unit, 7a, 7b: clamping roller, 7c: hot-wire knife, 7d: drive belt, 8: lower gripper, 9: carrier, 10: upper gripper, 11: swing arm, 12: used film discharging device, 20, 21, 22: drive motor, 41, 42, 4
3: Proximity switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-276920 (JP, A) JP-A-51-115190 (JP, A) Jiko 4-49050 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) B65D 69/00

Claims (1)

(57) [Claims] 1. A package formed by covering a top surface of an object loaded on a pallet with a film, further wrapping the side surface with a stretch film, and integrating the stretched film on one side surface and the lower end thereof. From the front to the upper end, the film is opened to the left and right, and used for an unpacking machine for a film package, and two pairs of clamping rollers for clamping the stretch film from the front and back and a cutter for cutting the film A method of controlling a film cutting unit that moves up and down at a peripheral speed of the holding roller along a column opposed to the side surface, wherein the film cutting unit rotates the holding roller from a lower end of its stroke. At a preset position in the middle of ascending, while stopping the cutting unit, the holding roller is continuously rotated for a set time, Then, the control method of the film cutting unit for the unpacking machine of the film package body includes stopping the holding roller and raising the film cutting unit by the stop time.