JPS5827924Y2 - Gripping and cutting device for packaging sheets in automatic packaging machines - Google Patents

Description

[Detailed description of the invention] In this invention, the receiver is installed in an automatic packaging machine that wraps the various products placed in the tray using a stretchable thin packaging sheet, and the rear end of the packaging sheet is This invention relates to a gripping and cutting device that grips and simultaneously cuts the same.

Perishable foods are packaged by placing them in a tray made of a suitable material and covering the top with a transparent plastic packaging sheet.

Automatic packaging machines that perform this packaging work mechanically can be roughly divided into:
There are two types of packaging methods: one in which the article to be packaged is moved relative to the packaging sheet, and the other in which the packaging sheet is moved relative to the article.

By the way, the automatic packaging machine developed by the applicant of this invention (such as Publication of Utility Model Publication No. 56-31521) adopts the latter method mentioned above, and also transfers the wrapped product from the delivery side of the packaging sheet. The structure is such that it can be carried outside.

In an automatic packaging machine with such a structure, the gripping means that grips the rear end of the packaging sheet needs to descend after gripping the packaging sheet to stretch the packaging sheet and open a passage for the product to be carried out. However, the part where the gripping means is provided forms the heart of the automatic packaging machine and contains various mechanisms, so it is required to be particularly simple in structure and to operate smoothly. .

This invention was made in view of the above points, and details thereof will be explained below with reference to the drawings.

The drawing shows one embodiment of this invention, and 1 is a frame.

This frame 1 is provided with a pair of left and right sprocket wheels 2 and 3 arranged on the left and right sides at a required interval, and is provided with upper and lower sprocket wheels 2 and 3, respectively, at opposing positions.

Endless chains 4 are wrapped around the sprocket wheels 2 and 3 on the left and right sides, and the upper sprocket wheels 2 and
2 is rotated clockwise in FIG. 2 in synchronization with each other by rotation by a drive device (not shown) of a drive shaft 5 on which the drive shaft 5 is mounted.

The pair of endless chains 4, 4 are stretched vertically and form a pull-out path a for the packaging sheet 6 that is pulled out almost horizontally from left to right in FIG. Supported at intervals.

Therefore, when the endless chains 4, 4 are operated as described above by the drive device, the left pressing bar 7 in FIG. The pressing bar 7 on the right side goes around the sprocket wheel 3 and exits on the left side, and then crosses the passage a from the bottom to the top.

On the other hand, a clamper 8 is disposed in the downward movement path of the press bar 7.

The clamper 8 cooperates with the pressing bar 7 that is moving downward to grip the packaging sheet 6, and is pushed by the pressing bar 7 and descends together with the packaging sheet 6 while gripping the packaging sheet 6. It is provided in the lifting frame 9 attached to 1.

The elevating frame 9 is guided along a guide rail 11 by a guide wheel 10 attached to the lower part of the frame 1, and is urged upward by a resistance member 12 made of a spring stretched between the frame 1 and the guide rail 11. It is installed between 1 and 1 so that it can be raised and lowered freely.

The clamper 8 has a guide rod 14 inserted into a guide tube 13 provided in the middle portion of the lifting frame 9, is urged upward by a spring 15, and is fixed to a rod 17 of a sonoid 16. This is also provided so that it can be moved up and down.

Further, the upper end of the guide rail 11 has a length larger than the vertical movement width W of the press bar 7, and the clamper 8
A member 18 is horizontally attached to the receiver which receives the pressure of the pressing bar 7 together with the member 18.

Therefore, when the solenoid 16 is actuated while the packaging sheet 6 is being gripped, the clamper 8 moves down against the elasticity of the spring 15, and the receiver separates from the pressing bar 7 that is in contact with and presses the member 18, and the packaging sheet 6 is wrapped. Release the grip on the sheet 6.

On the other hand, a cutter 19 is provided at the middle portion of the endless chain 4 on the upward side.

This cutter 19 is cut on the delivery side (second
It cuts the packaging sheet 6 by being moved downward by a solenoid or other cutting drive mechanism (not shown).

20 is a rotary wheel attached to the press bar 7 in order to reduce the frictional resistance between the press bar 7 and the member 18; 21 is a pull-out roller for the packaging sheet 6; and 22 is a roll-wound packaging sheet 6. The support roller 23 is a stopper.

Next, the operation of the gripping and cutting device according to the invention constructed as described above will be explained.

FIG. 2 shows the state in which the packaging sheet 6 is pulled out by a pull-out mechanism (not shown); in this case, two pressing bars 7
is stopped at the top and bottom.

When the packaging sheet 6 is finished being pulled out, the endless chain 4 is moved to the second
Rotate clockwise in the diagram.

With this operation of the endless chain 4, the upper pressure bar 7 descends around the sprocket wheel 2, and the lower pressure bar 7 moves upward around the sprocket wheel 3.

At this time, the elevating frame 9 is raised by the action of the resistance member 12 so that the lower pressing bar 7 is pushed upward by the support member 18.

The press bar 7, which has descended from top to bottom as the endless chain 4 rotates, first comes into contact with the clamper 8, which has risen together with the lifting frame 9, at the middle part of the endless chain 4 (see the two-dot chain line in Fig. 2). ) After gripping the packaging sheet 6 and lowering the clamper 8 against the elasticity of the spring 15, the receiver contacts the member 18 with the rotary wheel 20 and continues lowering.

The other pressing bar 7 that is rising moves away from the clamper 8, which stopped rising upon contact with the descending pressing bar 7, and rises, pushing up the delivery side of the packaging sheet 6, but at this time, the cutter 19 It is activated to cut the delivery side of the packaging sheet 6.

The descending press bar 7 continues to descend as described above while gripping the clamper 8 and packaging sheet 6, and stops just before reaching the bottom dead center as shown in Fig. The rear end of the packaging sheet 6 pulled out above (not shown) is pulled down by the above-mentioned lowering operation and becomes appropriately tensioned.

Once this is completed, the four sides of the packaging sheet 6 are attached to the bottom of the pan by a necessary mechanism (not shown), but at this time, the solenoid 16 is activated to attach the trays at the rear end of the packaging sheet to the bottom of the pan as the attachment operation progresses. The clamper 8 is activated at an appropriate time to move the clamper 8 downward against the elasticity of the spring 15 to release the grip on the packaging sheet 6.

This completes one working cycle. By the way, the packaged tray passes between the endless chains 4, 4 from right to left in FIG. 2, and is carried outside.

In addition, in the above embodiment, the pair of endless chains 4 have two
Book pressing bars 7 are attached at equal intervals, and the packaging sheet 6
The structure is such that the pressure bar 7 is gripped alternately.
It is also possible to configure the number of books or three or more books.

As explained above, in this invention, the press bar 7 is circulated up and down by a pair of endless chains 4, and works together with the clamper 8 to grip and lower the packaging sheet 6. This has the effect that the gripping and tensioning of step 6 can be done simultaneously and reasonably.

Furthermore, since the structure is simple and a wide space can be left between the pair of endless chains in the standby state, it is possible to draw out the packaging sheet 6 and carry out the trays after wrapping without any trouble. .

Furthermore, when two pressure bars are attached to a pair of endless chains at equal intervals, the rising pressure bar that is not working to grip the packaging sheet lifts the packaging sheet upward, allowing the cutter to cut the packaging sheet well. There are also advantages.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with FIG. 1 being a front view and FIG. 2 being a side sectional view. 2.3...Sprocket wheel, 4...
...Endless chain, 6...Wrapping sheet, 7...
...Press bar, 8...Clamper, 12...
...Resistance member, 16...Solenoid (release device), 19...Cutter, a...Drawer passage, b...Movement passage.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A pair of left and right endless chains with the same configuration, which are rotatably stretched around a plurality of sprocket wheels and rotated in synchronization with each other by the rotation of the sprocket wheels by a drive device, and this pair of left and right endless chains. A pressing bar is installed between the pair of endless chains so as to cross the pulling path of the packaging sheet formed between the chains, and a pressing bar is arranged in the movement path of the pressing bar and cooperates with the pressing bar to pull out the packaging sheet. a clamper that moves a required distance by being pushed by a pressing bar against the resistance of a resistance member while gripping the sheet, a cutter that cuts the delivery side of the packaging sheet gripped by the pressing bar and the clamper, and a pressing bar. A gripping and cutting device for a packaging sheet in an automatic packaging machine, characterized in that it is separated from a release device that moves a clamper that cooperates to grip the packaging sheet away from a pressure bar to release the grip on the packaging sheet. . 2. A gripping and cutting device for packaging sheets in an automatic packaging machine according to claim 1, wherein two pressing bars are attached to the pair of endless chains at equal intervals.