JPH0784230B2 - Hot air supply device in container mouth encapsulation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container mouth wrapping device for wrapping a thermoplastic thin film sheet made of polyethylene or the like in the mouth of various containers such as milk bottles,
In particular, the present invention relates to an improved technique of a hot air supply device used for heat-shrinking the sheet piece in the wrapping operation.

[0002]

2. Description of the Related Art Conventionally, in the technique of encapsulating the mouth of a container of this type, a thermoplastic thin film sheet made of polyethylene or the like is used as an encapsulating material, and hot air is supplied to the sheet piece during the encapsulation work. There is widely known an encapsulation technique in which heat shrinkage is caused to bring the container into close contact with the mouth of the container (Japanese Patent Publication No. 36-19090). However, since the hot air supply means in this prior art is incorporated in the rotating part of the main body of the apparatus for performing the encapsulation work, the sheet piece cutting mechanism and the sheet piece is pressed against and supported between the upper surface of the mouth of the container. The structure is extremely complicated in relation to the sheet piece support mechanism and the like, the arrangement is unreasonable, and maintenance is hindered.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a container mouth portion wrapping device which solves the above-mentioned drawbacks of the prior art by incorporating the hot air supply means into the rotating portion. It is an object of the present invention to provide a hot air supply device.

[0004]

In order to solve the above-mentioned problems, the present invention is arranged around the rotation axis of the apparatus main body,
Corresponding to the pedestal of an appropriate number of containers that reciprocate through an appropriate elevating mechanism while revolving on the circumference of a predetermined radius, above the wrapping head that covers the mouth of the container with a thermoplastic sheet piece. The container is placed inside the encapsulating head and
Forming a cylindrical heating space capable of accommodating the mouth, and
An opening for supplying hot air is provided on the side wall of the outer peripheral surface of the encapsulating head.
And forming, by arranging the hot air supply means having a blowout in a position communicatable the opening to an appropriate outer peripheral portion of the trajectory of the encapsulation head, of the encapsulated head through the opening
Due to the hot air supplied to the inside from the periphery of the mouth of the container
It is characterized in that the sheet piece is heated . In this case, the hot air supply means may be provided with a relief valve for discharging hot air when the operation of the apparatus main body is stopped.

[0005]

Since the hot air supply means is not incorporated in the rotating portion of the apparatus main body, its structure is greatly simplified and maintenance is facilitated. Moreover, a container is placed inside each of the encapsulating heads.
A cylindrical heating space that can accommodate the mouth of the
Through the opening for hot air supply formed on the side wall of the
The hot air supplied from the periphery of the mouth of the container
Since the heating strip is heated, the hot air supply means is
Even if it is arranged only on the outer peripheral part of the locus of the head,
In addition, a good heating effect without unevenness can be obtained. Further, when the relief valve is attached, hot air is released through the relief valve when the operation of the apparatus main body is stopped, so that the container is prevented from being overheated during the envelope work.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view showing an overall layout of an embodiment of the present invention, which includes a conveyor 1, an apparatus body 2 for enclosing a sheet piece in the mouth of a container conveyed by the conveyor 1, and a container. The main elements are a ribbon hooking device 3 for hanging a fastening ribbon on a sheet piece wrapped in the mouth of the sheet, a sheet piece feeding device 4 and a ribbon feeding device 5.
The container conveyed on the conveyer conveyor 1 is transferred to the apparatus main body 2 through the introduction path composed of the star wheel 7 and the guide 8 at predetermined intervals by the infeed screw 6 at a predetermined timing. In the apparatus main body 2, the sheet pieces are delivered from the sheet piece supply device 4 in the delivery area A. In this sheet piece supply device 4, a belt-shaped sheet 10 is supplied from a supply roll 9 to a roller 11 for tensioning.
While applying a predetermined tension by using, a feed roller 12 for feeding and a pinch roller 13 feed out at a predetermined speed. When the belt-shaped sheet 10 is adsorbed and transferred on the vertical axis rotating drum 14 for cutting, the belt-shaped sheet 10 is cut into a sheet piece having a predetermined length by an appropriate cutting mechanism 15 using a heat cutter or the like. This sheet piece is adsorbed and held on the cylindrical outer peripheral surface of the vertical axis rotating drum 16 for delivery, and in the delivery area A, is delivered to the arc-shaped adsorption holding surface of the sheet piece holding segment on the apparatus body 2 side. In this case, the vertical axis rotating drum 14 for cutting, the vertical axis rotating drum 16 for delivering, and the sheet piece suction holding means in the segment for holding the sheet piece on the side of the apparatus body 2 serve as a suction holding means for the sheet. A means for vacuum suction through the provided through hole is used. Then, the delivery between them is performed by performing on / off control of the vacuum state in accordance with the delivery timing angle. In the figure, 17 indicates a supply roll for a spare.

In the work area B, the segment of the apparatus main body 2 is rotated horizontally while sucking and holding the sheet piece, and the mouth portion of the container is inserted into the opening formed in the segment, so that the sheet A work process is performed in which a piece is covered on the mouth of the container. In the heating region C, as will be described later, the hot air sent from the hot air supply means 18 is guided to the sheet piece portion covering the mouth portion of the container to cause the heat shrinkage. In the cooling region D, the cool air from the cool air supply means is guided to the sheet piece portion to cool that portion. In this way, the container in which the sheet piece is wrapped in the mouth part has a discharge area E
And is transferred to the ribbon hooking device 3 via a guide path formed by the star wheel 19 and the guide 20. Similar to the case of feeding the sheet pieces, the ribbon-hanging device 3 is fed by a feed roller 21 for feeding while a belt-shaped ribbon 22 from a feed roll 21 is applied with a predetermined tension by a tension roller 23. It is sent out at a predetermined speed by the 24 and the pinch roller 25. The ribbon 22 is applied with hot melt by a hot melt supply means 26 on the way and then supplied to a known ribbon hanging device 3 to carry out a ribbon hanging operation on a sheet piece portion covered by the mouth portion of the container. Is done. The container on which the ribbon hanging operation has been completed is the star wheel 27 and the guide 28.
And is discharged onto the conveyor 1.
In the figure, reference numeral 29 is a spare supply roll, and 30 is a heating means.

Next, with reference to FIGS. 2 and 3, the work of wrapping the sheet piece in the mouth of the container will be described. Figure 2
Is a vertical cross-sectional view showing the main part of the apparatus main body 2, and FIG.
FIG. 3 is a plan view showing a main part of the apparatus main body 2 with a partial cross section. In the figure, 31 is a fixed shaft, 32 is a rotary shaft, and 33 is a bearing portion thereof. A cam plate 34 is fixed to the fixed shaft 31, and a rotary plate 35 is fixed to the rotary shaft 32. An appropriate number of encapsulating heads 36 are arranged on the outer peripheral portion of the rotary plate 35. A cylindrical heating space is formed inside each encapsulating head 36.
A pressing member 38, which is pressed downward by a spring 37 , is slidably incorporated in the inside thereof, and by pressing the upper surface of the mouth portion of the container 40 which is lifted and lowered by the lift base 39, a sheet piece 41 is provided. The pressing member 38
Configured so as to press supported between the mouth portion upper surface of the container 40 and
Has been done. And the cylinder inside the encapsulating head 36
If the mouth of the container 40 is housed in the space,
Formed between the cylindrical inner wall of the container and the mouth of the container 40
The hot air passages are formed by the spaces, and the sheet piece 41 is heated.
It will function as a space. An annular sheet piece squeezing member 42 composed of a coil spring or the like is disposed below and inside thereof, and serves to squeeze the sheet piece 41 so as to cover the mouth of the container as the container 40 rises. .
Further, on the outer side of each encapsulating head 36, a segment 43 having an arc-shaped sheet piece suction holding surface is provided.
It is supported rotatably about a support shaft 45 via.
A link mechanism composed of a connecting rod 46, a lower arm 47, a rotating shaft 48 and an upper arm 49 is connected to the other end of the rotating arm 44 on one side of each segment 43, and the outer peripheral surface of the cam plate 34 is connected thereto. It is configured to be rotated by a cam follower 50 that moves along the cam surface formed on the. In the figure, 51 is a return spring connected to the lower arm 47. Further, a vacuum pipe 52 for adsorbing and holding a sheet piece is connected to each segment 43, and through a joining means 53 such as a rotary joint,
It is connected to a vacuum means such as a vacuum pump (not shown).
In the figure, 54 is an opening for inserting the mouth of the container 40 formed in the central portion of each segment 43, and 55 is the encapsulation head so as to communicate with the hot air supply means 18 in the heating region C.
A hot air supply opening formed in the side wall of the outer peripheral surface of the door 36, and 56 denotes a cold air supply pipe connected to the cool air supply means such as a blower (not shown) through the joining means 53.

The sheet piece 41 cut into a predetermined length by the cutting mechanism 15 is, in the delivery area A,
Segment 43 from the vertical axis rotary drum 16 to the apparatus main body 2 side
To be delivered to. During this delivery, segment 4
As shown on the left side of FIG. 2, 3 is in the vertical state, and in this state, the sheet piece 41 is delivered from the vertical axis rotary drum 16. As the rotary plate 35 rotates, the upper arm 49 pivots outward along the cam surface of the peripheral surface of the cam plate 34 via the cam followers 50 as shown in FIG. As a result, the segment 43 includes the rotating shaft 48, the lower arm 47, the connecting rod 46, and the rotating arm 44.
Is rotated to a horizontal state. In parallel with this, the container 40 is transferred onto the elevating table 39 of the apparatus main body 2 at a timed timing by the star wheel 7, and the elevating table 39
Rises with the rise of. As a result, the mouth of the container 40 is inserted through the opening 54 formed in the center of the segment 43, as shown on the right side of FIG. At this time, the sheet piece 41 sucked and held by the segment 43 is pressed and supported between the upper surface of the mouth of the container 40 and the pressing member 38 and pulled upward, and at the same time, the sheet piece squeezing member 42 moves the sheet piece 41 of the container 40. It is squeezed along the outer shape of the mouth portion and covered on the mouth portion of the container 40.

In this state, when the heating area C is entered, the hot air supply means 1 is applied to the opening 55 of the encapsulating head 36.
8 outlets are communicated, hot air is supplied to the portion of the sheet piece 41, and thermal contraction is performed. FIG. 4 is a partial side view showing this hot air supply state. In the figure, 57 is a connecting portion,
Reference numeral 58 denotes an appropriate heating means, which is connected to a blower or the like via this connecting portion 57, and air is supplied to the heating means 58. The hot air heated by the heating means 58 is supplied to the flat hot air blowing portion 60 connected downward via the intermediate connecting portion 59 as shown by an arrow A, and the encapsulating head 3 is heated.
The air is blown toward the opening 55 through a plurality of air outlets 61 formed on the side surface facing the opening 55 provided in the nozzle 6. In this case, the outlet 61 is provided over the entire length of the heating region C as shown in FIG. 1, and the hot air supplied through the opening 55 in the heating region C is, as described above, covered. Cylindrical shape inside the packaging head 36
Through the gap formed between the inner wall of the container and the mouth of the container 40
Evenly around the mouth of the container 40 Te is supplied without the exhaust holes 6
It is exhausted via 2 etc. That is, the encapsulation head 36
The cylindrical space formed inside heats the sheet piece 41.
It functions as a space, and due to the heating action here, the sheet piece 4
In particular 1 to contact the mouth of the container 40 causing the heat-shrinkable
Become In the figure, 63 indicates a support member connected to the fixed side of the apparatus main body 2, and the blowout port 61 is the encapsulating head 3
The hot air supply means 18 is supported so as to communicate with the opening 55 of the nozzle 6. Further, in the figure, reference numeral 64 denotes a relief valve for releasing hot air, which is installed below the hot air blowing portion 60 via an air blowing portion 65, and is used when the operation of the apparatus main body 2 is stopped.
It is configured to be rotated by driving means such as 6 and to radiate hot air to the outside as shown by an arrow B. This prevents overheating of the container during the wrapping operation when the operation of the apparatus body is stopped. Then, when further moving to the cooling region D, since the cool air is supplied from the cold air supply pipe 56 to the portion of the sheet piece 41 through the gap of the sheet piece throttle member 42, the shape of the sheet piece 41 is fixed. . In this way, the container 4 with the sheet piece 41 wrapped in the mouth portion
0 is discharged in the discharge area E, and in the next ribbon hanging device 3, the sheet piece 41 portion is fastened by the ribbon 22 and then discharged onto the transport conveyor 1.

[0011]

According to the present invention, the following effects can be obtained based on the above constitution. (1) Since the hot air supply means is provided in the outer peripheral part of the locus of the encapsulating head without being incorporated in the rotating part of the apparatus main body, its configuration is greatly simplified and maintenance is facilitated (claim 1). . (2) A cylindrical inner wall formed inside the encapsulating head and a container
Around the mouth of the container through the gap formed with the mouth of
The hot air is evenly supplied to the enclosure to heat the sheet pieces from the surroundings.
As a result, the hot air supply means is connected to the locus of the encapsulating head.
Even if it is properly arranged only on the outer peripheral part, there is no unevenness.
A good heating effect is obtained (Claim 1). ( 3 ) Since hot air is released through the relief valve when the operation of the apparatus main body is stopped, overheating of the container during the covering work is prevented (claim 2).

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an overall layout of an exemplary embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the main parts of the apparatus main body 2 in the embodiment.

FIG. 3 is a plan view showing a main part of the apparatus main body 2 with a partial cross section.

FIG. 4 is a partial side view showing a hot air supply state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conveyor, 2 ... Device main body, 3 ... Ribbon hanging device, 4 ... Sheet piece supply device, 5 ... Ribbon supply device, 9 ...
Supply roll, 12 ... Feed roller, 15 ... Cutting mechanism,
16 ... Delivery vertical axis rotary drum, 18 ... Hot air supply means, 21 ... Supply roll, 30 ... Heating means, 31 ... Fixed shaft, 32 ... Rotation shaft, 34 ... Cam plate, 35 ... Rotation plate, 36
... Encapsulating head, 38 ... Pressing member, 39 ... Lifting platform, 40 ...
Container, 41 ... Sheet piece, 42 ... Sheet piece drawing member, 43
... segment for adsorbing and holding sheet piece, 44 ... rotating arm, 46 ... connecting rod, 47 ... lower arm, 49 ... upper arm, 50 ... cam follower, 52 ... vacuum pipe, 5
3 ... Joining means, 54 ... Opening portion for inserting mouth of container, 55
... Opening for hot air supply, 56 ... Cold air supply pipe, 57 ...
Connection part, 58 ... Heating means, 59 ... Intermediate connection part, 60 ... Hot air blowing part, 61 ... Hot air blowing port, 62 ... Exhaust hole, 6
3 ... Support member, 64 ... Relief valve, 65 ... Blowing part, 66
…Air cylinder

Claims (2)

[Claims] 1. A pedestal for a proper number of containers, which is disposed around a rotation axis of a main body of the apparatus, and which moves up and down through a proper elevating mechanism while revolving on a circumference of a predetermined radius, corresponding to an upper portion of the pedestal. In the container, an encapsulating head for covering the mouth of the container with a thermoplastic sheet piece is provided, and the container is placed inside the encapsulating head.
Forms a cylindrical heating space that can accommodate the mouth of the vessel, and
An opening for supplying hot air is formed on the side wall of the outer peripheral surface of the encapsulating head.
Parts to form a, disposed hot air supply means having a blowout in a position communicatable the opening to an appropriate outer peripheral portion of the trajectory of the encapsulation head, the encapsulation header through the opening
From around the mouth of the container by the hot air supplied to the inside of the container
A hot air supply device in a container mouth wrapping device, characterized in that the sheet piece is heated . 2. The hot air supply means is provided with a relief valve for discharging hot air when the operation of the apparatus main body is stopped.
A hot air supply device in the mouth enveloping device of the container described.