JPH0441045Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to an apparatus for wrapping trayed items with a film, particularly a stretch film.

Prior Art As a conventional packaging device of this type, the present inventor has already provided a device disclosed in Japanese Utility Model Publication No. 40002/1983.

Problems to be Solved by the Invention In the above method, everything from pulling out the film to moving the film presser frame was done manually, but the present invention improves and automates this point.

Means for Solving the Problems The present invention provides a tray transporting means for intermittently transporting trays to a packaging position, a film transporting means for intermittently transporting a film to a packaging position, and a film transporting means for intermittently transporting a film to a packaging position. Equipped with a film heating means for heating and softening the film to an appropriate temperature for forming, an air suction means for bringing the film covered on the tray at the packaging position into close contact with the periphery of the tray by suctioning air, and a means for cutting the film around the outer periphery of the tray. In a packaging device for tray-packed products, the tray transfer means is fixed to a number of packaging tables with air intake chambers attached to an endless chain at equal intervals, and on an air intake hole plate on the top surface of each packaging table, and a tray receiving frame with a resistance wire stretched around the periphery, and the film transfer means are arranged at intervals slightly larger than the dimensions of the packaging table in the transfer direction, and the film transfer means are arranged at the front and back positions of the packaging table in the transfer direction. A film presser bar is placed between the film presser bar and a film presser bar for pressing the film from a direction perpendicular to the film presser bar, and the film presser bar is placed between the film presser bars to press the film along the transfer direction on both sides of the packaging table in the transfer direction, and also to hold the film while conveying it. It is composed of a plurality of film hooking fittings, and an endless chain having a length that is an integral multiple of the length of one frame of film presser bars, and to which the film presser bars and film hooking fittings are attached for a plurality of frames, and further, The present invention is characterized in that the film transfer means and the tray transfer means are meshed with each other at the packaging position so that the film transfer surface is lower than the upper surface of the outer periphery of the packaging table.

Function The basic structure of the packaging requires air intake, and for this purpose, the inside of the packaging table must be isolated from the outside by a film touching the outer corner of the packaging table. As a means for this purpose, a film presser frame is used in Japanese Utility Model Publication No. 58-40002, but this cannot be attached to an endless chain.
Therefore, in the present invention, film presser bars are attached to an endless chain at predetermined intervals, a film hook is provided between them, the packaging table is held down by the presser rods in the front and back of the transport direction, and the packaging table is transferred Both sides along the direction are held down by film hooking fittings. This film hook is
It is attached to each chain link of the endless chain in a state where it is divided into multiple pieces independently, so that even when the endless chain changes direction, it can rotate smoothly while holding the film. In addition, at the packaging position, all of the film is lined up horizontally in a straight line, and both sides of the film can be pressed perfectly.

According to the present invention, the film is transported one frame at a time to the packaging position, and the operator only has to insert the tray-packed items into the tray receiving frame in front of the packaging position, and the finished product is manually transported behind the packaging position. It can be taken out during work or transported on a conveyor.

That is, at the packaging position, the film is spread over the trayed items, the suction action causes the film to adhere to the outside of the tray, and then the resistance wire is energized for a short time to melt and cut the film, completing the packaging. It is considered a good item.

The above-mentioned film is heated to an appropriate temperature for forming while being fed to the packaging position. Embodiment FIG. 1 is a side view showing a schematic structure of the entire apparatus of the present invention, in which A indicates a tray transfer means, B a film transfer means, C a film heating means, and D a suction means.

There are a plurality of tray transfer means A (four in Fig. 1).
Two endless chains 2, 2 installed on a chain wheel 1
, packaging tables 3 are mounted at equal intervals. As shown in FIG. 2, each packaging stand 3 has an intake chamber 3a at the bottom.
The upper surface is an intake hole plate 3c having a large number of intake holes 3b, and a tray receiving frame 3d is fixedly mounted on this intake hole plate 3c. The intake chamber 3a is
The suction action from the hose connection port 11a, which will be described later,
The film transfer means B extends into the film F placed on the packaging stand 3, and this film F
This is to bring the tray into close contact with the outer periphery of the tray receiving frame 3d. A resistance wire 3e such as a nichrome wire, an iron chrome wire, a tungsten wire, a molybdenum wire, etc. is stretched around the outer periphery of the tray receiving frame 3d, and the film F is fused by being energized. This is the film cutting means E in the invention.
The tray receiving frame 3d is made of a material having only electrical insulating properties or a heat insulating property, such as asbestos, and has a peripheral cross section of a right triangle.

Further, the film transfer means B has two endless chains 5, 5 installed on a plurality of (four chain wheels 4 in the drawing) a film presser at an interval slightly larger than the dimension in the transfer direction of the packaging table 3. Rods 6, 6 are arranged, and an appropriate number of film hooking fittings 7 are arranged between them at appropriate intervals. The film holding rods 6, 6 and the film hooking fittings 7 are arranged for a plurality of frames (four frames in FIG. 1).

As shown in FIG. 3, the film presser bars 6, 6 are attached between two endless chains 5, 5 via appropriate blankets 6a, 6a, and two endless chains 5, 5 are attached to the film hooking fitting 7. They are attached independently to the chains 5, 5, and normally the ones on both sides are attached facing each other, but this is not restrictive.

As the film F, a commonly used stretch film is used. The film hook 7 is preferably made of a material such as stainless steel and has a mirror-like surface. This utilizes the property of stretch film to self-adhere to smooth surfaces. Further, the tip of the film hooking fitting 7 is bent into an L-shape, and the film F is hooked on this portion. Further, a locking protrusion such as a barb may be provided at the L-shaped tip. The film hooking fitting 7 is a member for holding and transporting the film F from the supply position to the packaging position, and it should be understood that the metal fitting is not limited to being made of metal. The position where the film F is pulled out from the roll 8 and hooked onto the film hooking fitting 7 is as shown in FIG.
When the chain 5 is in the direction change position above, the distance between the film hooks 7 attached to the chain 5 in the chain running direction is widened, and when the chain 5 is in the straight running position after the direction change, The distance between the film hooking fittings 7 in the chain running direction is restored and contracted, so that the hooked film F also shrinks in the chain running direction, and during packaging, the film F stretches well and good packaging can be obtained.

The distance between the film hooking members 7, that is, the film holding distance in the direction perpendicular to the chain running direction, is larger than the width of the packaging stand 3.

At the packaging position A, the packaging table 3 by the tray transfer means A and the film F by the film transfer means B are engaged so that the tip positions of the film hooking fitting 7 and the film presser bars 6, 6 are lower than the upper surface of the outer periphery of the packaging table 3. The film F is set at a position lowered by about 5 mm to ensure that the film F touches the outer corner of the packaging table 3.

The film heating means C is preferably a hair dryer type hot air heater, and the temperature of the hot air should be maintained at about 40°C with a thermostat.If the temperature is too high, the film F may sag and form holes.
If it is too low, the elongation will be poor.

The suction means D is for applying suction to the suction chamber 3a of the packaging stand 3 that has reached the packaging position A, and FIG. 5 shows an example thereof. That is, in FIG.
9 is a shaft fixedly supported by a frame (not shown);
10 is a disc-shaped valve lid fixedly integrated with the shaft 9; 11
is a disk-shaped intake distribution valve that is rotatably fitted on the shaft 9, and is integrally equipped with a chain wheel 12 and a spring 13.
The valve cover 10 is constantly pressed against the valve cover 10 via the thrust bearing 14.

An intake passage 9a is formed in the shaft 9 along the axial direction, and is connected to an intake source via a hose by a hose connection fitting 9b at one end, and the other end of the intake passage 9a is formed in the valve cover 10. It is communicated with the intake passage 10a. The valve cover 10 is provided with only one intake hole 10c communicating with the intake passage 10a on a surface 10b facing the intake air distribution valve 11. The intake distribution valve 11 has hose connection ports 11 arranged at equal positions on its outer circumferential surface.
The number of hose connection ports 11a is the same as the number of packaging stands 3 installed in the tray transfer means A, and each hose connection port 11a communicates with an end opening 11b of a passage independently formed in the intake distribution valve 11. This opening 11b is formed on the surface facing the valve lid 10, and
They are provided at equidistant positions on the circumference that coincide with the intake holes 10c. The hose connection port 11a is connected to the intake chamber 3a of the packaging stand 3 via a hose, and the intake distribution valve 11 is connected to the opening 11b via the chain 15 and drive chain wheel 16 in synchronization with the intermittent feeding operation of the tray transfer means A. It is made to rotate intermittently to the evenly spaced pitch,
As a result, air can be sequentially applied to the air intake chambers 3a of the packaging table 3 that has reached the packaging position A. The opposing surfaces of the valve cover 10 and the intake air distribution valve 11 are rubbed together to prevent air leakage, and the materials used for these may be, for example, the valve cover 10 is made of cast iron, and the intake air distribution valve 11 is made of planed metal casting. obtain.

Note that the intake means D is not limited to the above,
For example, one suction head that communicates with the suction source is placed directly below the packaging position A, and is connected to the suction chamber 3 of the packaging table 3 through actuating means such as a solenoid or a pneumatic cylinder.
The suction head may be connected to and disconnected from the suction connection port a, and the suction head may be successively connected to the packaging table 3 that reaches the packaging position a. In this case, a nozzle with a check valve is attached to the intake head, and only when connected to the packaging table 3, the check valve is opened at a part of the intake connection port of the packaging table 3 to communicate the intake air, The check valve can be closed when the tray is separated from the packaging table 3, and the timing for connecting the suction head to the packaging table 3 is set to be approximately at the same time as the intermittent feeding of the tray transfer means A is stopped. However, the timing for separating from the packaging table 3 may be set immediately before the start of the intermittent feeding movement of the tray transfer means A, and may be set using a timer or the like.

When the film F covers the upper surface of the tray receiving frame 3d and is suctioned tightly around the upper surface of the tray receiving frame 3d by the suction means D at the packaging position A (after a predetermined time set by a timer from the start of suction), the film cutting means E cuts the film F from the packaging position A to the packaging position Only the resistance wire 3e of the tray receiving frame 3d in A is energized for a short time (set by a timer according to the time required for film fusing). Although the wiring and energization control means for this purpose are omitted in the drawings, they may be a rotary switch type similar to the method of the intake means D described above or a docking type using a single solenoid provided at the packaging position A. It is.

Tray transfer means A and film transfer means B are
Taking into consideration the time required for wrapping and cutting the film after wrapping at the wrapping position A, they are driven intermittently in synchronization at the same traveling speed, and the amount of feed per time is made equal to one frame.

The film F is unrolled one frame at a time from the roll 8, heated to a suitable temperature for forming by the film heating means C, and sequentially sent to the packaging position A.

Tray-packed products (not shown) are sequentially mounted on the tray receiving frame 3d at the tray mounting position B in front of the packaging position A, and when moving to the packaging position A, the film F
is covered from above and synchronously enters the packaging position A, and when it stops at the packaging position A, the suction air is immediately applied to the packaging table 3 to perform packaging with the film F, and then the film F is fused and cut. After this, the trays are sequentially taken out at the tray take-out position C, and this operation is repeated. The film scraps F' remain on the packaging table 3 and are placed in the first position in front of the tray mounting position B.
It is wound up onto a roll 17 as shown in the figure.

Effects of the invention According to this invention, not only the packaging work is automated, but also the film transporting means and the tray transporting means are arranged so that the film transporting surface is lower than the outer peripheral upper surface of the packaging table at the packaging position. By setting the meshing so that can. That is,
When the film is pressed against a corner of the outer periphery of the packaging table, the inside of the packaging table is isolated from the outside at that part, and a suction action is automatically activated. Moreover, the film hooking device not only transfers the film, but also serves to hold down both sides of the tray in the direction of transfer, and the film presser bar can be used to control both sides of the tray in the direction of transfer. Of course, the film can be reliably transferred to the packaging position by being hooked with a film hooking device, and the film can be voluntarily pulled out by the tray after packaging is transferred from the packaging position by the tray transfer means or by the articles on the tray. Therefore, there is no disadvantage that the heat-softened film is excessively stretched before reaching the packaging position, and damage to the film can be prevented. In addition, the film is cut by applying electricity to the resistance wire stretched around the tray receiving frame to fuse it, which is easier and more reliable than using a cutting knife or the like, and can also be cut at the packaging position. Therefore, the space can be reduced by that amount, and the entire device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the entire device of the present invention, Fig. 2 is a perspective explanatory view showing the relationship between the tray transfer means and the packaging table, Fig. 3 is a perspective explanatory view showing the structure of the film transfer means, and Fig. 4 5 is an explanatory diagram showing an example of setting the film hooking start position of the film transport means, and FIG. 5 is a perspective explanatory diagram showing an example of the suction means. A... Tray transfer means, B... Film transfer means, C... Film heating means, D... Air intake means,
E...Film cutting means, F...Film, 2...
...Endless chain, 3...Packaging stand, 3a...Intake chamber, 3b...Intake hole, 3c...Intake hole plate, 3d...
...Tray receiving frame, 3e...Resistance wire, 5...Endless chain, 6...Film presser bar, 7...Film hooking fitting, A...Wrapping position.

Claims (1)

[Scope of Claim for Utility Model Registration] Tray transport means for intermittently transporting trays to the packaging position, film transport means for intermittently transporting the film to the packaging position, and heating the film to an appropriate temperature for forming on the way to the packaging position. A tray-packed product comprising a heating means for softening the film, a suction means for bringing the film covered on the tray at the packaging position into close contact with the periphery of the tray by suctioning air, and a means for cutting the film around the outside of the tray. In the packaging device, the above-mentioned tray transfer means is installed on a large number of packaging tables with suction chambers attached to an endless chain at equal intervals, and is fixed on the suction hole plate on the top surface of each packaging table, with a resistance wire around the outer periphery. The film transport means are arranged at intervals slightly larger than the dimensions of the packaging table in the transport direction, and the film transport means are arranged in a direction perpendicular to the transport direction at the front and back positions of the packaging table in the transport direction. and a plurality of film hooks disposed between the film presser bars to press the film along the transfer direction on both sides of the packaging table in the transfer direction, and to hook and hold the film for conveyance. It comprises a metal fitting, and an endless chain having a length that is an integral multiple of the film presser bar arrangement interval of one frame, and to which the film presser bar and the film hooking metal fittings are attached for a plurality of frames, and further comprising a film transport means. 1. A packaging device for tray-packed products, characterized in that the film transporting means and the tray transporting means are engaged with each other at the packaging position so that the film transporting surface is lower than the upper surface of the outer periphery of the packaging table.