JPS5916241Y2 - heat sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for heat sealing a continuously transitioning film in a direction perpendicular to the direction of the transition.

This type of device is used in automatic packaging devices, etc., where it is essential to fill a continuous cylindrical film with an object to be packaged and then seal it laterally.

As a conventional device of this type, those shown in FIGS. 1 and 2 have been proposed.

In the device shown in FIG. 1, two meshing gears 100
．． It is of the type in which heat seekers 102 and 102' are fixed to rotating shafts 101 and 101' fixed at 100'.
' are brought into contact with each other, and the film A' is heat-sealed between them.

This device has a simple mechanism, but since sealing is only performed at point a in Figure 1, there is a drawback that there is insufficient sealing time and it is difficult to perform sufficient sealing, which is a problem especially when increasing speed. becomes.

Next, what is shown in FIG. 2 has two slide rods 10.
The seek case 104 is of a type in which the seek case 104 is reciprocated up and down by the crank 105 using the pinion 103' as a guide. , 10
9' is provided, and the desired position of the reciprocating movement of the seek case 104 is set to the rack 106 by an air cylinder 110 or the like.
is moved, the rack 107 is moved in the opposite direction, and during seek 109, 109', the film to be sealed is sandwiched and heat-sealed.

The motion locus of the seek 109, 109' in this sealing device is box-shaped as shown in Figure 2. Although the sealing time is sufficient compared to the one in Figure 1, it is difficult to increase the speed due to the box-shaped motion. The major drawbacks are that the upper structure is complicated and that a driving device such as an air cylinder is required, resulting in an increase in cost.

The present invention provides a heat sealing device that eliminates the drawbacks of the conventional devices as described above.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus according to the present invention will be described in detail below based on illustrated embodiments.

In Fig. 3, 1 and 1' are in a state where the L side edges in the length direction are parallel to each other as shown in the figure.
It is a thief whose side edges periodically come into contact and perform a lateral seal between them and then separate.

The thieves 1, 1' are provided with two sealing surfaces for laterally sealing the tubular film at two locations separated by a distance l, as best shown in the side view of FIG.

The thief 1, 1' has thief holders 10. at both outer ends.
10' is fixed, and the thief holder 10 has a hinge pin 1.
4 is fixed.

Since the thief holders 10 and 10' have the same structure, only the thief holder 10 will be described below.

A slide piece 11 is attached to the hinge pin 14 so as to be relatively rotatable.

20 is a rotational drive sprocket; sprocket 20
A suitable drive chain 21 is engaged.

The rotation given to sprocket 20 is
The signal is transmitted to a gear 16A fixed to the shaft.

Thief holder 1 fixed to Thief 1 and Thief 1' respectively
Similar gears 16A', 16B corresponding to 0.10'
, 16B' are provided, gears 16A and 16B and 16A' and 16B' mesh with each other, and gears 16A and 16A are drivingly connected via gears 16C and 16C'.

A slide guide 12 is attached to each gear as shown for gears 16A and 16B, and the slide piece 11 described above is slidably engaged with each slide guide 12.

These gears, slide guide 12, slide piece 1
1 constitutes the rotor referred to in the present invention.

A spring seat 15 is fixed to each gear, and a spring 9 is interposed between the spring seat 15 and the slide piece 11 to push the slide piece 11 away from the spring seat 15.

13 is a stopper attached to one of the sliding grooves of the slide guide 12.

As clearly shown in FIGS. 4 and 5, a rod holder 17 and a slide sleeve 19 are fixed to the thief holder 10', respectively.

Below the thief holder 10.10' there is a horizontal rod 1
A rod holder 17 is provided at one end of the rod 18.
is fixed thereto, and the aforementioned slide sleeve 19 is fitted so as to be slidable along this rod 18.

This configuration allows the thieves 1, 1' to be displaced only in the direction along the rod 18.

One of the thieves 1 and 1', that is, the thief 1, is provided with a cutter mechanism that cuts the cylindrical film laterally sealed between the thieves 1 and 1'. This will be explained.

3 to 5, a horizontal groove is formed in the thief 1 at an intermediate position between the upper and lower sides thereof, and a cutter 2 that slides within this groove is disposed.

The back of the cutter protrudes from the back of Thief 1.

Two hinge holders 4 are fixed to the rear surface of the thief, and a hinge rod 5 is pivotally mounted between the hinge holders 4.

A push pin 3 and a cam lever 6 are fixed to the hinge rod 5, and the upper end of the push pin 3 engages with a hole in a cutter 2 protruding from the rear surface of the thief 1.

A cam follower 7 is pivotally attached to the tip of the cam lever 6.

The cam follower 7 is adapted to engage with a cam plate 8 fixed to the gear 16A.

Next, the operation of the above-mentioned horizontal seal mechanism will be explained based on the mechanism diagrams shown in FIGS. 6 to 9.

Due to the rotational motion transmitted to the sprocket 20 via the chain 21, the gear 16A rotates in the direction of the arrow in the figure, and the gears 16 A', 116 B, and 16 B' also rotate in the direction of the arrow in the figure.

Each gear 16 A', 16 A', 16 B', 1
6B' rotates, the slide guide 12, slide piece 11. The thief 1, 1', which is attached via the hinge pin 14, is connected to the aforementioned rod 18.
Since the movement of the cranks is restricted by the engagement with the gears, the cranks move in a circular motion toward and away from each other, always in a horizontal state, as shown in FIGS. 6 to 8, in accordance with the rotation of the gears.

FIG. 6 shows gears 16A and 16B and 1 that engage with each other.
The gear is rotated to a position where the slide pieces 11 of 6A' and 16B' are pushed away from each other by the spring 9, and at this time the thieves 1 and 1' are fully opened.

Next, Fig. 7 shows a state in which the gear is rotated 90 degrees from the position shown in Fig. 13, and the slide piece 11 is pushed upward by the spring 9, so the thieves 1 and 1' are also lifted upward. and are close enough to each other to engage with, for example, a cylindrical film A' to be laterally sealed.

Next, FIG. 9 shows a state in which the gear has rotated 180 degrees from the position shown in FIG. 6, the thieves 1 and 1' are completely closed, and the spring 9 is compressed and crimped together, similar to FIG. 3. ing.

In this state, the cylindrical film A' to be horizontally sealed is
As shown in the figure, the vertical distance is l due to the thief 1°1'.
It is closed by being heat fused in the lateral direction at two positions where the

As shown diagrammatically in FIG. 9, the thieves 1 and 1' come into contact with each other at point a as the gear rotates, and thereafter continue to come into contact with each other until the spring 9 is compressed until point b, during which time the horizontal seal is conduct.

To explain the operation of the cutter, in Figs. 4 and 5, the thieves 1 and 1' are in the most open state (the
In Figure), the cam follower 7 does not engage with the cam plate 8, and the cutter 2 is in a position where it does not protrude from the front surface of the thieves 1.
When the thieves 1 and 1' are closed and the cam plate 8 comes into contact with the cam follower 7, the cam follower 7 is pushed by the cam plate 8, causing the hinge rod 50 to rotate and the cutter 2 to be pushed forward via the push pin 3. It protrudes from the mating surface of the thief 1 and cuts the cylindrical film X between the two horizontal seals of the thief 1.

In this way, the bag is closed at its upper end with a lower horizontal seal and the position immediately above the cut portion is closed with an upper horizontal seal to form the bottom of the cylindrical film A'.

The film A' to be horizontally sealed is continuously transported downward, and the linear speed between a-6 is synchronized with the transport speed when horizontally sealing is performed between a-1) in Figure 9. Needless to say, it is.

As shown in Fig. 8, the bottom is attached to the lower end of the cylindrical film A', the gear rotates once, and then the cylindrical film A' is sandwiched between the thieves 1 and 1'. An object to be packaged is dropped into this cylindrical film A', and when it is closed again as shown in FIG. 8, the object to be packaged is accommodated.

Next, a second embodiment of the horizontal seal mechanism will be described with reference to FIG. 10.

In this embodiment, the thieves 1 and 1' are attached to the gears through the slide guide 12, the slide piece 11 and the spring 9, which are the parts that constitute the rotor in the previously described embodiment, and are eccentrically attached to the gears. The support frame 24 is pivotally attached to the pin, and the spring 9' is attached to this support frame, which together with the gear constitutes the rotor, and the thieves 1, 1' are attached.The other parts may be the same as those described above. The explanation will be omitted.

It is easy to understand that this second embodiment also performs lateral sealing in the same manner as in the first embodiment.

As specifically explained above, the apparatus according to the present invention is an apparatus for heat-sealing a film that is continuously transferred in a direction perpendicular to the direction of the transfer, and is provided with a continuous rotation.
A slide piece that is biased in one direction by a spring is slidably engaged with a slide guide fixed to each of two pairs of rotating disks, and has a pair of thieves attached to the slide piece, This sealing device is driven only by the rotation of the rotor and can be operated at high speeds.
The sealing action is performed by applying the eccentric movement caused by the rotation of the rotor to the thief via a spring, and the thief performs the sealing action so as to have a notched circular motion locus, so that the sealing time and sealing pressure can be set as desired to ensure sufficient sealing. can be done.

Further, in the heat sealing device according to the present invention, since the slide guide is fixedly attached to the rotating disk, the structure of the device is compact, and the direction of force of the spring against the thieves changes as the rotating disk pair rotates. Since the thieves are oriented away from each other when the film is not heat-sealed, it is possible to perform a sealing action by inserting a filler of a predetermined size into the film, even though the structure is compact.

Furthermore, this device is driven only by the rotation of the rotor, making the mechanism extremely simple, resulting in fewer failures and a lower price.

[Brief explanation of the drawing]

FIGS. 1 and 2 are drawings showing a conventional heat sealing mechanism, FIG. 3 is a perspective view showing an embodiment of the heat sealing device according to the present invention, and FIGS. 4 and 5 show different operations. 1 and 6 to 8 are mechanical views of the device shown in FIGS. 3 to 5, each shown in a different operating position. . FIG. 9 is a diagram for explaining the sealing operation of the device shown in FIG. 3, and FIG. 10 is a drawing showing another embodiment of the device according to the present invention. 1 and 1'... Thief, 9 and 9'... Spring, 10... Thief holder, 11...
Slide piece, 12...Slide guide, 1
3...Stopper, 14...Hinge pin, 15...Spring seat, 16...Gear as a disc, 17...Rod holder , 18...
...Rod, 19...Slide sleeve, 24...Support frame.

Claims (1)

[Scope of utility model registration request] In an apparatus for heat sealing a continuously migrating film in a direction perpendicular to the direction of the migration, a pair of rotating discs are provided with continuous rotation, and a slide is attached to each of the discs and rotated together with the discs. A rotor pair comprising a guide, a slide piece slidably engaged along the slide guide, and a spring biasing the slide piece in one direction along the slide guide to eccentrically center the slide piece, and each rotor pair. A heat sealing device characterized in that it has a pair of seekers attached to the slide piece.