JPS6231375Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a heat-sealing device for unwinding and heat-sealing a packaging body made of a thin synthetic resin sheet.

[Prior art] A packaging body made of a thin synthetic resin sheet for packaging electronic components such as diodes, Tr, IC, etc.
The packaging body 1 is continuously formed into a tube shape, flattened and wound into a coil shape, and the packaging body 1 is sequentially fed out from the coil 2 as shown in FIG. Both the front and back thin sheets 3 and 4 are heat-sealed 5 in a direction perpendicular to the axis at appropriate intervals 1 along the axis, and then the heat-sealed portion 5 is
Heat seal part 5 so that the part becomes the bottom of packaging bag 6
Cut the upper part 7 at an appropriate distance from the part to make a packaging bag 6 of a predetermined length L, and vacuum-suction both the front and back sheets 3, 4 near this cut-off part from the outside to open the packaging bag 6. After expanding the section 9 and dropping the electronic component 8 into it, the opening 9 is heat sealed to complete the packaging of the electronic component 8.

As a prior art of a device that heat-seals the packaging body wound into a coil shape to a portion that will become the bottom of a packaging bag while unwinding it to a predetermined length,
In Publication No. 40041, a pair of clampers that clamp the packaging body from both outside sides are provided at the lower part of the coil so as to be movable up and down, and both clampers are each provided with a heater section on opposing surfaces that clamp the packaging body. , move both clampers up as appropriate with the distance between the two heater parts open, then close them there and lower them while holding the packaging object, then open them at the lowest position and move them up, repeating this operation as appropriate to secure the packaging object. When unwinding, in order to unwind a predetermined length, the heater is turned on for an appropriate amount of time during the final lowering of the clamp to heat-seal the front and back sheets of the packaging body, and this cycle is repeated to seal the bottom of the packaging bag onto the packaging body. Forming a heat seal is disclosed.

[Problems to be solved by the invention] However, in the prior art, the pair of heater parts has the role of sandwiching and pressing both the front and back thin sheets 3 and 4 to heat-seal them, and at the same time serves to heat-seal the thin sheets 3 and 4 while sandwiching them in a downward direction. It is also necessary to play a role of pulling people together.

In this case, if the surface members of the heater parts (the surfaces which come into contact with and press the front and rear thin sheets 3, 4) are made of a material which is poor in thermal conductivity and heat resistant, such as cloth impregnated with a fluororesin, for example polytetrafluoroethylene (trade name Teflon), heat is not transferred to the entire area clamped by the heater parts when the heaters are heated, and heat sealing can be performed in a substantially straight line only in the vicinity of the heater parts. However, since these materials generally have a small coefficient of friction, there is a disadvantage that the dimensions of the package which slides when it is clamped and lowered vary, resulting in packaging bags of different lengths or electronic components protruding out.

On the other hand, if a material with a large coefficient of friction is selected for the surface material of the heater part, problems may arise in heat resistance, making it difficult to satisfy both the unwinding operation of the packaging body and the heat sealing operation at the same time. There was a problem.

Furthermore, although the optimal pressure level for the clamping action and the optimal pressure level for the heat-sealing action are generally different, in the prior art, only the heater part is involved, so the clamping action and the heat-sealing action are performed simultaneously and integrally. Therefore, there was a problem in that the optimum pressing force could not be adjusted.

The present invention aims to solve the problems of the prior art and to improve the payout of packaging materials without impairing the heat sealing workability.

[Means for Solving the Problems] Therefore, in the present invention, one of the front and back clampers that clamps the top and bottom longitudinal packaging bodies made of front and back thin sheets made of synthetic resin from the front and back outsides is arranged so that one can be opened and closed with respect to the other. In a heat-sealing device for delivering a packaging body, the device is configured to lower both clampers simultaneously in a closed state and to rise simultaneously in an open state. A pair of clamping pieces for clamping the object are provided facing each other, and the pair of clamping pieces are made of an elastic body with a large coefficient of friction. A heat-sealing press body is provided at an appropriate distance above or below the clamper, and a press receiving member is provided on the surface of the other clamper facing the heat-seal press body.

[Operations and effects of the invention] In this way, on the opposing surfaces of the pair of front and back clampers, the clamping piece portion that clamps the thin sheet and the heat-sealing portion are separated vertically so as to be appropriately spaced. The surface material of the clamping piece that plays the role of holding and pulling the thin sheet downward, and the surface material of the heat-sealing press body that plays the role of heat-sealing the thin sheet while holding and pressing it, and the press receiving member that faces it. You can select the most suitable material for each role.

Furthermore, since the clamping piece is separated from the heat-sealing press body, the influence of heat generated by the heat-sealing press body and its press receiving member on the clamping piece is extremely reduced.

Furthermore, since the holding pieces are made of a material with a high coefficient of friction and an elastic body that does not cause slipping against the thin sheet, slipping will not occur when holding the thin sheet and pulling it downward. Therefore, the unwinding operation of the packaging body can be carried out smoothly and reliably.

In this way, the present invention allows a pair of clampers to clamp and pull a pair of front and back thin sheets and heat-seal them at the same time, yet it is possible to package the sheets without impairing the heat-sealing workability. This has the remarkable effect that the body can be drawn out well.

[Example] Next, an example of the present invention will be described based on the drawings. Numeral 10 is a device for unwinding and heat-sealing the packaging body 1 of the present invention, and the packaging body 1 is wound onto the lower part of the coil 2 around which the packaging body 1 is wound. A pair of front and back clampers 11 and 12 formed in a substantially horizontal length so as to clamp the body 1 from both the front and back sides, and which can be raised and lowered freely; and an opening/closing device that opens and closes the back clamper 12 by moving it closer to and closer to the front clamper 11. It consists of 13.

The front clamper 11 is fitted onto a shaft 15 which is set up on a base 14 so as to be able to move up and down.
A roller 17 attached to the base of the front clamper 11 is mounted on the cross-sectional guide rail 16 that stands parallel to the front clamper 11.
is inserted so as to be vertically movable, and the front clamper 11 is configured to be raised and lowered by an appropriate vertical distance l1 by a driving means 18 such as an air cylinder arranged parallel to the shaft 15.

A back clamper 12 disposed opposite the front clamper 11 is horizontally rotatably pivoted by a pin shaft 20 to a pair of upper and lower brackets 19, 19 protruding from near the base of the front clamper 11. 2
A compression spring 21 inserted between both clampers 11 and 12 closer to the base than zero biases the free end side of the back clamper 12 toward the free end of the front clamper 11 so that their palms come together.

The frame body 22 of the opening/closing device 13 is pivotally supported on a support 23 erected on a base 14 so as to be horizontally rotatable at a position slightly vertically apart from the vertical movement position of both the clampers 11 and 12. A vertical guide body 24 is provided on the frame body 22 along the back surface near the free end of the back clamper 12, and a roller 26 at the tip of an arm 25 protruding from the free end of the back clamper 12 can be moved up and down by the vertical guide body 24. A trochanter 28 is attached to the tip of an arm 27 that integrally projects horizontally from the frame 22 (for example, the lower part).
A cam 30 is horizontally rotated by a motor 29.
According to the rotation of the cam 30, the free end of the frame 22 separates from the front clamper 11, and the frame 22
The back clamper 12 engages with the vertical guide body 24 of
rotates about the pin shaft 20 against the force of the spring 21, so that the back clamper 12 opens relative to the front clamper 11.

Then, both the front and back clampers 11, 12 close at the uppermost position and descend while sandwiching the packaging body 1 from the front and back, and both clampers 11, 12 open at the lowermost position and rise to the uppermost position in the open state. The rotation of the cam 30 and the lifting and lowering of both clampers 11 and 12 by the lifting/lowering driving means 18 are configured to be synchronized.

Further, the front clamper 11 has a main body shaped like a letter in cross section, and the back clamper 12 has a main body divided into upper and lower parts from the base and formed in a letter shape when viewed from the front in a horizontal bifurcated manner. ,12
are arranged so that their upper and lower horizontally protruding portions face each other, and clamping pieces 31 and 32 made of an elastic body with a large coefficient of friction such as synthetic rubber are placed on the upper horizontal protrusions of both clampers 11 and 12, respectively, facing each other. Provided.

A pin 34 pivots on the lower horizontal protrusion of the back clamper 12 so as to be horizontally rotatable at the midpoint of a cross-sectional, horizontally long heat-sealing pressing body 33 that fits horizontally from the front clamper 11 direction. wear it. A horizontally long heater 35 facing the front clamper 11 is buried in the lower part of the heat seal press body 33, and the front surface of the heater 35 is made of a material with poor thermal conductivity and heat resistance, such as cloth impregnated with fluororesin. The partition wall plate 36 is stretched.

Further, this heater 35 is connected to both the clampers 11,
Among the 12 predetermined lowering operations from one to a plurality of times, the power is turned on for an appropriate time during the final lowering time when the unwound package 1 reaches a predetermined length l.

On the other hand, in the concave groove of the lower horizontal protrusion of the front clamper 11, a press receiving member 37 having substantially the same length as the heater 35 is provided at the same height position as the heater 35 so as to be movable backward with respect to the front surface of the heater 35. That is, the press receiving member 37 is made entirely of a heat-resistant material with poor thermal conductivity such as fluororesin, or at least the vertical surface facing the heater 35 is covered with a sheet made of the material. Pins 3 are attached to the front clamper 11 at multiple locations appropriately spaced in the longitudinal direction.
8 and 38 so as to be movable in a direction perpendicular to the longitudinal direction thereof, and a buffer piece 39 made of an elastic material such as rubber provided on the main body of the front clamper 11 causes the press receiving member 37 to protrude forward. The clampers 11 and 12 close, and when the packaging body 1 is heat-sealed, the heat-sealing press body 33 and the press receiving member 37 become approximately parallel to each other along their longitudinal direction, and are pressed uniformly along the longitudinal direction. Pressure packaging body 1
It is configured so that it can be assigned to

With this configuration, both the front and back clampers 11, 12
In the open state, raise it by a distance l1, close it at the top position, and clamp the packaging body 1 from the front and back with the front and back clamping pieces 31 and 32 on the upper sides of both clampers 11 and 12, and in that state, raise it by the same distance 11, then open both clampers 11 and 12 at the lowest position, and then rise again. This operation is repeated one or more times for a predetermined number of times, and the packaging body 1 is removed from the coil 2.
When feeding out a predetermined length l, the heater 35 is turned on for an appropriate period of time during the final lowering of the clamps so that a horizontal straight line is drawn across both sides of the packaging body 1 at right angles to the downward feeding direction of the packaging body 1. A heat seal portion 5 is formed. By repeating this cycle, the heat-sealed portions 5 can be formed at appropriate intervals while continuously unwinding the packaging body.

In addition, during this heat sealing, the front surface of the heat seal pressing body 33 is a partition wall plate 3 having poor heat conductivity and heat resistance.
6, the temperature rises only near the front surface of the heater 35, and only the 37 locations of the press receiving member facing the front surface of the heater 35 are pressurized. This prevents the front and back sheets 3 and 4 of the body 1 from being thermally deformed or welded together.

Furthermore, the heat sealing pressing body 33 is attached to the back clamper 12.
It is horizontally rotatable with respect to the main body, and when the press receiving member 37 facing the press receiving member 37 is pressed by the heat seal pressing body, it retreats while resisting the elastic force of the buffer piece 39, so that the back clamper 12 is attached to the 20 pin shafts. When rotating around the front clamper 11 and closing it, the packaging body 1 is pressed almost uniformly by the free end sides of both clampers 11 and 12 and the side near the rotational axis of the base end. Various types of heat sealing can be applied. Note that instead of the heater 35, an inductor may be provided for heat sealing using high frequency waves.

In this way, since both clamping pieces are provided separately from the heat-sealing press body that generates heat and the press receiving member to which heat is transferred, heat conduction is eliminated in both clamping pieces, so both clamping pieces are made of heat-resistant material. It is possible to select materials with high elasticity and friction coefficient, such as rubber elastic bodies, which can maximize the clamping function of the packaging body, and is not limited to the material of the heat sealing press body. Therefore, the feeding action of holding and pulling the thin sheet can be reliably performed.

In addition, by varying the thickness of the pair of clamping pieces and the dimensions of the heat-sealing press body and the press receiving member facing it, we can simultaneously satisfy the optimal degree of pressure in the clamping action and the optimum degree of pressure in the heat-sealing action. can do.

Furthermore, since it is necessary to apply heat sealing uniformly to both the left and right sides of the packaging object, it is possible to achieve complete heat sealing by configuring the clamping piece, press receiving member, and heat sealing press body separately. .

It should be noted that reversing the vertical positional relationship of the pair of clamping pieces with respect to the pair of press receiving member and heat-sealing pressing body from the above-mentioned embodiment is simply a matter of design, and can be easily done.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the process of making a packaging bag from a packaging body, Fig. 2 is a front view of the device of the present invention, Fig. 3 is a sectional view taken along the line - - of Fig. 2, and Fig. 4 is a diagram showing the process of making a packaging bag from a packaging body. −
5 is an enlarged sectional view taken along the - line in FIG. 3, and FIG. 6 is a side view taken along the - line in FIG. 2. 1...Packaging body, 5...Heat sealing part, 11,1
2... Front and back clampers, 18... Lifting drive means,
22... Frame body, 24... Vertical guide body, 30...
Cam, 20...Pin shaft, 21...Compression spring, 3
1, 32... Holding piece, 33... Heat sealing press body,
35...Heater, 36...Partition plate, 37...Press receiving member, 39...Buffer piece.

Claims (1)

[Scope of utility model registration request] One of the front and back clampers that clamps a top and bottom longitudinal packaging body made of front and back thin sheets made of synthetic resin from the front and back outside thereof is arranged to be openable and closable relative to the other, and both clampers are lowered at the same time in a closed state,
In a heat sealing device for feeding and heat-sealing packaging bodies that is configured to rise all at once in an open state, a pair of clamping pieces for clamping the packaging bodies are provided facing each other on opposing surfaces of both clampers. The pair of clamping pieces are made of an elastic material with a large coefficient of friction, while the surface of one of the clampers is heat-sealed at a position appropriately spaced above or below the clamping piece. A device for delivering and heat-sealing packaging bodies, characterized in that a pressing body is provided, and a press receiving member is provided on the surface of the other clamper facing the heat-sealing pressing body.