JP2000168711A - Three side seal film packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely weld by a sideways sealer. SOLUTION: One face part 5b of a pair of sideways sealer face parts of a sideways sealer 5 comprising a pair of sideways sealer face parts 5a, 5b is pivoted on a sideways sealer arm 51b and a cutter 57 on a cutter arm 51a. These arms are pivoted on a pivot point 0 fixed on a main body one by one. The cutter is installed freely slidable on a groove part 5a' formed on the other face part 5a of the sideways sealer face parts, and the cutter takes shelter in the groove part when the pair of the sideways sealer face parts touch for welding, and the other part of the sideways sealer face parts is elastically connected to the cutter arm through a spring 5d to make the cutter protrude from the groove in cutting after welding. A crank machine 52 provided drives the sideways sealer arm and the cutter arm to move apart from each other. Or the other part of the sideways sealer face parts can be fixed to the other sideways sealer arm pivoted on the pivot point, and in this case, the cutter, etc., is fixed in each arm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-side seal film packaging machine, and more particularly to a three-side seal film packaging machine having a box motion type horizontal sealer.

[0002]

2. Description of the Related Art Conventionally, a packaged film is wrapped with an object to be packaged to weld a vertical sealer and a horizontal sealer (end sealer).
There is known a film packaging machine which forms a three-sided seal wrapper having a predetermined length in accordance with the vertical dimension of an article to be packaged by fusing. As a mechanism of the horizontal sealer of such a film packaging machine, a rotary system and a box motion system are known. In the rotary method, as shown in FIG.
The film is pressed and heated by rotating a pair of heat seal portions 81a and 81b, which are arranged vertically and heated by a heater 82, in the flow direction of the film, and is incorporated into the pair of heat seal portions 81a and 81b. The packaging film 24 pressed and heated by the cutter 83 and the receiving blade 84 is cut, and the packaging film 24 is welded and melted. Note that a pair of heat seal portions 81a, 81
The tips of b are formed in an arc shape, and the arc-shaped surface keeps the line contact by the circular motion, so that the packaging film 24 can be pressed and heated.

On the other hand, the box motion system is used as a package for hermetic sealing, and is classified into a combination system of linear motion and a system based on circular motion. As shown in FIG. 15, a combination method of the linear motion includes a pair of heat seal portions 93a and 93b provided on a guide rod 92 erected on a slide member 91 so as to be separated from each other and heated by a heater. The packaging film is pressurized and heated by linear movement (packaging film pressurizing step), and the packaging film pressed and heated by a cutter incorporated in one of the pair of heat seal portions 93a and 93b is cut (packaging film). Cutting process). At this time,
By moving the slide member 91 linearly in the horizontal direction in synchronization with the film speed, it is possible to perform welding and cutting at an intermediate position between the wrappings of the set wrapping length. Can be.

As shown in FIG. 16, a system based on circular motion is a pair of heat seal portions 101a and 101b which are arranged vertically and are heated by a heater 102.
Are made to make contact with the packaging film by making them move substantially in a semicircle while facing each other, and further, by being translated in synchronization with the film speed of the packaging film, the packaging film is pressed and heated, and finally the upper heat-sealing portion 101a Then, the cutter 103 incorporated is ejected to cut the package film heated and pressed, and the package film is welded and cut. The ends of the pair of heat seal portions 101a and 101b are formed in a planar shape, and the planar surfaces move in parallel, so that surface contact can be maintained, so that the packaging film can be pressed and heated. Therefore, heat can be stably supplied by prolonging the heat supply time, so that a strong and good seal can be performed. Further, since the pair of heat seal portions 101a and 101b approach the packaging film while maintaining the facing state, tight packaging is possible.

Further, as the box motion method, a method based on an arc motion having an intermediate feature of these methods is known. As shown in FIG. 17, the method based on this circular motion is a pair of horizontal sealer arms 111a and 111b pivotally connected at a pivot point O, and is installed at the tips of the pair of horizontal sealer arms 111a and 111b. A pair of heat seal portions 112a and 112 approaching and coming apart from each other
b and a pair of heat seal portions 112a, 112
b are each heated by a heater. The package film is pressed and heated by causing the pair of heat seal portions 112a and 112b to move in an arc with a pair of horizontal sealer arms 111a and 111b so as to approach each other.
By pressing the pair of heat seal portions 112a and 112b, the cutter 113 incorporated in the upper heat seal portion 112a is ejected to cut the press-bonded and heated packaging film, and the packaging film is welded and cut.

The pair of horizontal sealer arms 111a, 111
As shown in FIG. 18, the crank mechanism for making the circular motion 1b move up and down adjusting arm 11 of horizontal sealer height position adjusting mechanism 114.
By rotating the crankshaft 116 axially mounted on the crankshaft 5, the crank 117 transmitting the rotational movement of the crankshaft 116 to one of the pair of horizontal sealer arms 111a, and rotating the crankshaft 116 to the other 111b of the pair of horizontal sealer arms. The crank 118 that transmits the motion is configured so that the pair of heat seal portions 112a and 112b can be separated and approached from each other via the pair of horizontal sealer arms 111a and 111b. By rotating the vertical adjustment shaft 119 of the horizontal sealer height position adjustment mechanism 114, the other end 115b of the vertical adjustment arm 115 whose one end 115a is mounted on the main body 120 can be moved up and down. As shown in (a) and (b), the horizontal sealer height of the horizontal sealer can be positioned at half the height dimension H of the packaged object according to the height dimension of the packaged object. .

A method based on such an arc motion is described as follows.
It has the following advantages as compared to the above-described combination of linear motion and the method based on circular motion. (1) Since the motion trajectories of the pair of heat seal portions 112a and 112b are on the same circular arc, the alignment of the seal can be easily performed. (2) Since the pair of horizontal sealer arms 111a and 111b can be assembled around the axis (center of the pivot O).
Assembling is simplified, and accuracy is easily obtained. (3) Since a guide rod 92 (see FIG. 15) for increasing the height of the horizontal sealer itself and a frame having a large occupied area are not used as in the case of the combination method of linear motion, it is possible to reduce the weight and size. Further, since the center of gravity can be lowered, the inertial force during the reciprocating lateral movement can be reduced. (4) Although the mechanism is compact, the drive position can be separated from the pair of heat seal portions 112a and 112b, so that the position of each drive action point of the pair of horizontal sealer arms 111a and 111b can be set freely. it can. Therefore, it is possible to increase the opening height and the opening width of the pair of heat seal portions 112a and 112b. As a result, a large space can be secured around the pair of heat seal portions 112a and 112b, and a peripheral mechanism such as a gusset that can push both sides of the tunnel-shaped film immediately before sealing can be easily incorporated. be able to. (5) Since the height position of the horizontal sealer can be adjusted by the compact mechanism 114, the rigidity of the horizontal sealer unit itself is not impaired.

[0008]

However, in the box motion system based on an arc motion having such an intermediate feature, the sealing surfaces of the pair of heat seal portions 112a and 112b are formed in the film sheet pressing step. It is set so as to make surface contact (see FIG. 20A). In the subsequent film sheet cutting step, the pair of heat seal portions 112a and 112b must be further pressed to cause the cutter 113 to fly out.
0 (b), the pair of heat seal portions 112
In some cases, a gap S was formed between the seal surfaces a and 112b.

More specifically, as shown in FIG. 21, after the sealing surfaces of the pair of heat sealing portions 112a and 112b come into surface contact, when the pressure is further increased, the lower heat sealing portion 11
2b moves upward from the meeting position. At this time, the upper heat seal portion 112a is pushed back against the resilience of the spring 121, but the lower heat seal portion 112b moves linearly in spite of the arc movement. Surface contact is not possible except at one of the meeting positions. In addition, since the motion trajectories of the heat seal portions 112a and 112b are different, a surface shift occurs. This surface deviation increases as the amount of pressing movement increases. Such gaps and surface shifts have an adverse effect on seal weight.

In order to alleviate the adverse effects of the gap and the surface deviation, a film sheet pressing step and a film sheet cutting step as shown in FIG. That is,
The order of the contact operation relationship between the pair of heat sealing parts is (a) small sealing pressure → (b) medium sealing pressure → (c) large sealing pressure → (b) medium sealing pressure → (b) small sealing pressure Set the mounting position so that However, setting such a sealing pressure condition requires an extremely complicated operation,
In addition, there is a problem that good surface contact cannot be achieved even in this contact operation.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and a three-way welding method capable of reliably performing welding by a box motion type horizontal sealer in which the motion trajectory of a heat seal portion is circular. An object of the present invention is to provide a seal film packaging machine.

[0012]

In order to achieve the above object, a three-way seal film packaging machine according to the present invention wraps a packaged product in a packaged film by a former provided in a main body and transports the packaged product on a center conveyor. A three-side seal film packaging machine that is welded by a pair of vertical sealer surface portions of a vertical sealer, welded by a pair of horizontal sealer surface portions of a horizontal sealer, and cut by a cutter to form a three-side seal wrapper having a predetermined wrapping length. One of the pair of horizontal sealer surface portions of the horizontal sealer is mounted on the horizontal sealer arm, and the cutter is mounted on the cutter arm, respectively.
A horizontal sealer arm on which one of a pair of horizontal sealer surfaces of the horizontal sealer is axially mounted and a cutter arm on which a cutter is axially mounted are respectively pivotally mounted on pivot points fixed to the main body, and the cutter is the other of the pair of horizontal sealer surfaces. The pair of lateral sealer surfaces are slidably fitted in the grooves formed in the pair, and the pair of lateral sealer surfaces are evacuated to the grooves during welding contact, and the pair of lateral sealer surfaces protrude from the groove at the time of cutting after welding. The other is elastically connected to the cutter arm via a spring.

In this three-side seal film packaging machine, when a pair of separated horizontal sealer surfaces of the horizontal sealer are brought closer to each other by a crank mechanism, one of the horizontal sealer surfaces is a horizontal sealer arm, and the other is a horizontal sealer surface. The cutter arms move and abut each other. Thereby, the packaging film is welded. Further, when the pair of lateral sealer surfaces are pressurized, the cutter is pivotally attached to the pivot point by the cutter arm, and the other lateral sealer surface is elastically connected to the cutter arm via a spring. And the other of the pair of horizontal sealer surfaces are pressed while in a contact state (contact state). At this time, since one of the pair of lateral sealer surface portions pushes up the other of the pair of lateral sealer surface portions against the elastic resilience of the spring, the cutter pops out by the amount of retreat of the other of the pair of lateral sealer surface portions. Will be. Therefore, the cutter protrudes from the other groove of the pair of lateral sealer surfaces. Further, since the pair of lateral sealer surfaces are pivotally mounted on the respective arms, they rotate so as to maintain the close contact state. As a result, a gap is not formed between the pair of horizontal sealer surfaces and no surface deviation occurs, so that stable welding can be performed.

Further, in the three-side-sealed film packaging machine of the present invention, it is preferable that the pair of horizontal sealer surfaces is provided with a guide. Accordingly, the pair of horizontal sealer surface portions are guided so as to be opposed to each other at the time of meeting, so that surface deviation does not occur. Further, the three-side seal film packaging machine of the present invention is characterized in that the packaged material is wrapped in a packaging film by a former provided in the main body, conveyed on a center conveyor, welded by a pair of vertical sealer surfaces of the vertical sealer, A three-sided seal film packaging machine that forms a three-sided seal wrapper having a predetermined wrapper length by welding with a pair of horizontal sealer side parts of a sealer and cutting with a cutter, wherein the pair of horizontal sealer side parts of the horizontal sealer are each paired with a horizontal part. With the sealer arm, the cutter is pivotally attached to a pivot point fixed to the main body by the cutter arm, and the cutter is slidably fitted into a groove formed in one of the pair of lateral sealer surfaces, and the pair of lateral sealer surfaces is One side of the pair of horizontal sealer surfaces is retracted via a spring so that the pair of horizontal sealer surfaces is retracted into the groove when welding abutment, and protrudes from the groove during cutting after welding. Those that are elastically connected to.

In this three-side seal film packaging machine, when a pair of separated horizontal sealer surfaces of the horizontal sealer are moved closer to each other, the pair of horizontal sealer surfaces are moved by the respective arms and come into contact with each other. Thereby, the packaging film is welded. Further, when a pair of lateral sealer surfaces are pressed, the cutter is pivotally attached to the pivot point by the cutter arm, and the other lateral sealer surface is pivotally attached to the pivot point by one lateral sealer arm. Are elastically connected to each other, so that when the other lateral sealer surface portion and the one lateral sealer surface portion are pressed in a contact state (abutting state), both of them perform the same circular motion. At this time, since one of the pair of lateral sealer surface portions pushes up the other of the pair of lateral sealer surface portions against the elastic resilience of the spring, the cutter pops out by the amount of retreat of the other of the pair of lateral sealer surface portions. Will be. Therefore, the cutter protrudes from the other groove of the pair of lateral sealer surfaces. As a result,
Since a pair of horizontal sealer surface portions do not have a gap or a surface shift, stable welding can be performed.

Further, the three-side seal film packaging machine of the present invention is provided with a horizontal sealer feed mechanism for driving the pivot point in synchronization with the film welding and conveying speed of the vertical sealer when the pair of horizontal sealer surfaces abut against each other. Therefore, even in the case of continuous operation, welding and cutting can be performed at the set position of the predetermined wrapping length by the horizontal sealer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a three-side seal film packaging machine according to the present invention will be described below with reference to the drawings. As shown in FIG. 5, a horizontal inverted pillow three-sided seal film packaging machine according to an embodiment of the present invention wraps a packaged product in a packaging film 24 by a former 2 and conveys the packaged product on a center conveyor 3 to form a vertical sealer 4. Welding and horizontal sealer 5
To form a three-side sealed zipper having a predetermined zipper length. The vertical sealer 4 performing such a packaging operation,
The horizontal sealer 5 and the center conveyor 3 are driven by an electric motor drive unit 6.

The main body 1 on which the vertical sealer 4, the horizontal sealer 5 and the center conveyor 3 for forming the three-side seal wrapper having the predetermined wrapper length are installed has a hexahedral frame structure formed in a trapezoidal shape, and has a basic skeleton. Denotes four vertical beams 11 and four column beams 1 that form a hexahedron together with the vertical beams 11.
2 and a plurality of T-shaped joints 13 connecting between the beams 11 and 12.

The vertical sealer 4 has vertical sealer surface portions (vertical heat seal portions) 4a and 4b composed of a pair of rotating bodies, and the vertical sealer surface portions 4a and 4b are brought into contact with each other. A gear mechanism 41 for rotationally driving the pair of vertical sealer surfaces 4a and 4b so as not to slip, and a coupling mechanism for rotationally driving the gear mechanism 41 by power from an electric motor driving unit 6 that transmits power to the vertical sealer 4. 42 and is mounted on a vertical sealer mounting table 43 for mounting on the upper vertical beam 11. Further, the vertical sealer 4 includes a vertical position adjusting mechanism 44 for integrally adjusting the vertical position.

As shown in FIGS. 1, 2, 3 and 4, the horizontal sealer 5 has a cutter arm 51a pivotally mounted at a pivot point O.
-51a and the horizontal sealer arm 51b-51b, and the cutter arm 51a-51a and the horizontal sealer arm 5
A pair of horizontal sealer surfaces (horizontal heat seal portions) 5a, 5b provided at the tips of 1b-51b for welding the packaging film.
A crank mechanism 52-52 for driving the cutter arms 51a-51a and the horizontal sealer arms 51b-51b to move away from each other, and a vertical direction of the horizontal sealer 5 from an electric motor driving unit 6 transmitting power to the horizontal sealer 5. A link connecting mechanism 53 (FIG. 5) for rotating and driving the crank mechanisms 52-52 in response to the movement in the transport direction (arrow X) of the packaged object, for mounting on the upper vertical beam 11. Is mounted on the horizontal sealer moving table 54. The horizontal sealer moving table 54 is configured to be able to reciprocate on the upper vertical beam 11 in the vertical direction (the direction in which the packaged material is conveyed (arrow X)).

The cutter arms 51a-51a and the horizontal sealer arms 51b-51b are connected to a horizontal sealer shaft 56-56 (pivot point O) fixed to an upper portion of a mounting plate 55-55 fixed to the horizontal sealer moving base 54. Is pivoted to. One of the pair of horizontal sealer surfaces 5b is a lower mounting plate 5c.
Is fixed to the horizontal sealer arms 51b-51b so as to be swingable, and the other 5a of the pair of horizontal sealer surface portions is connected to a spring 5d-
The upper mounting plate 5e is elastically connected to the upper mounting plate 5e via 5d, and the upper mounting plate 5e is swingably fixed to the cutter arms 51a-51a. Sleeves 5f-5f are fitted to both ends of the upper mounting plate 5e so as to be movable in the vertical direction. The sleeves 5f-5f are loosely fitted with springs 5d-5d, and the springs 5d-5d are in a pressurized state. So that it is fixed to the other 5a of the horizontal sealer surface. In addition, the sleeve 5f-5f
Is locked to the upper mounting plate 5e, so that the other side 5a of the horizontal sealer surface portion is suspended on the upper mounting plate 5e while the resilient force is applied to the springs 5d-5d. Further, a cutter 57 is fixed to the upper mounting plate 5e, and the cutter 57 is slidably fitted in a groove 5a 'formed in the other side 5a of the horizontal sealer surface.

With such a configuration, the cutter 57 is provided with a spring 5d when the pair of horizontal sealer surfaces 5a and 5b are brought into contact with each other by welding.
With the resilient force of -5d, it retreats to the groove 5a 'of the other 5a of the pair of horizontal sealer surfaces, and when cutting after welding, the springs 5d-5d
Can protrude from the groove 5a 'against the resilience. A groove 5b 'is formed in one of the pair of horizontal sealer surfaces 5b so as to accommodate the protruding cutter 57. Further, the pair of horizontal sealer surface portions 5a and 5b can swing, respectively, so that they are in close contact with no gap.

Further, an upper mounting plate 5e and a lower mounting plate 5c
The gap between the cutter arms 51a-51a and the lateral sealer arms 51b-51b is regulated so that the swing amount does not become larger than necessary. This is because when a pair of guide arms 58a, 58b serving as a guide for the pair of horizontal sealer surface portions 5a, 5b is provided, the pair of guide arms 5
Guide notches 58a ', 58 formed in 8a, 58b
This is because the approach is made in such a manner that b 'can be swung to the extent that b' does not come off. By providing the pair of guide arms 58a, 58b at both ends of the pair of lateral sealer surfaces 5a, 5b, it is possible to prevent the occurrence of surface misalignment when the pair of lateral sealer surfaces 5a, 5b meet. In addition, the pair of guide arms 58a, 58b can be mounted and adjusted so that the pair of lateral sealer surface portions 5a, 5b are opposed to and in close contact with each other when the pair of lateral sealer surfaces 5a, 5b meet.

As shown in FIG. 4, the crank mechanism 52 includes a timing sprocket 52a to which power from the electric motor drive unit 6 is transmitted via a link connecting mechanism 53 (see FIG. 5) described later, and the timing sprocket 52a. A fixed crankshaft 52b and the crankshaft 52b
Cranks 52c-52c, 52d-52d and 52c for moving the cutter arm 51a-51a and the lateral sealer arm 51b-51b away from each other by the rotational movement of
-52c, 52e-52e, and 52f-52f. The height of the crank of the crank mechanism 52 is adjusted by a horizontal sealer height position adjusting mechanism 59 described later.
Therefore, when the crankshaft 52b rotates, the cranks 52c-52c and 52d-52d move the cutter arm 51.
a-51a, cranks 52c-52c, 52e-52
e, 52f-52f are horizontal sealer arms 51b-51b
Are reciprocated around the pivot point O so as to move away from each other.

As shown in FIGS. 4 and 5, the link connecting mechanism 53 applies the power from the electric motor driving unit 6 to the timing sprocket 53a → the timing chain 53b → the timing sprocket 53c → the connecting shaft 53e → the timing sprocket 53f → the timing chain 53g. Through
Cranks 52c-52c, 52d-52d and 52c
-52c, 52e-52e and 52f-52f are transmitted to a timing sprocket 52a fixed to a crankshaft 52b for reciprocating motion. The timing sprocket 53a is provided in the electric motor drive unit 6, the timing sprockets 53a and 53c are connected by a link 53A, and the timing sprockets 53f and 52a are connected by a link 53B. Note that the timing chain 53b includes timing sprockets 53a,
The timing chain 53g is wound between the timing sprockets 53f and 52a.

The links 53A and 53B extend and contract by moving the horizontal sealer 5 in the vertical direction (the direction in which the package is transported (arrow X)). Can be transmitted. Also, as shown in FIGS. 1, 2 and 4, the horizontal sealer 5 adjusts the height of the crank of the crank mechanism 52 to cover the horizontal sealer height of the horizontal sealer 5 in accordance with the height of the packaged object. A horizontal sealer height position adjusting mechanism 59 is provided which is positioned at a height H which is half the height of the package (see FIGS. 20A and 20B). The horizontal sealer height position adjusting mechanism 59 includes a vertical adjusting arm 59b-59b, one end of which is axially attached to a lower portion of the mounting plate 55-55 by a vertical adjusting arm shaft 59a, and a shaft mounted at the other end of the vertical adjusting arm 59b-59b. Vertical adjustment shaft 59c worn
And a bevel gear 59d-59d fixed to a predetermined portion of the up / down adjustment shaft 59c, and an up / down adjustment screw 5 to which the bevel gears 59e-59e engaged with the bevel gears 59d-59d are fixed.
9d-59d; and vertical adjustment blocks 59f-59f fixed to lower projecting portions 54a-54a formed at predetermined positions of the horizontal sealer moving base 54 (see FIG. 5) and screwed with vertical adjustment screws 59d-59d. A vertical adjustment handle 59g fixed to one end of the vertical adjustment shaft 59c and vertically moving the vertical adjustment screws 59d-59d. In addition, the up and down adjustment arm 5
A crankshaft 52b is journaled between one end and the other end of each of 9b-59b.

Accordingly, by rotating the vertical adjustment handle 59g, the horizontal sealer height of the horizontal sealer 5 is set to a height H which is half the height of the packaged object according to the height of the packaged object (FIG. 20). (See (a) and (b)). Further, as shown in FIGS. 4 and 5, the horizontal sealer 5 has a pair of horizontal sealer surface portions 5a and 5b which are pivotally connected at the time of welding and abutment in order to continuously form a three-package seal wrapper having a predetermined wrapper length. A horizontal sealer feed mechanism 500 for driving the O (horizontal sealer 5) in synchronization with the film welding and conveying speed of the vertical sealer 4 is provided. The horizontal sealer feed mechanism 500 includes a driving sprocket 501 fixed to a crankshaft 52b to which a timing sprocket 52a is fixed, and a mounting plate 55-55.
Driven sprocket 502 fixed to the vertically adjustable arm shaft 59a attached to the shaft, and a chain 503 wound between the driven sprocket 501 and the driven sprocket 502
Motion flanges 504 to 504 fixed to both ends of the vertically adjustable arm shaft 59a;
-504 and lower part 43 of vertical sealer mounting table 43
In order to connect the a-43a, the motion links 505 to 505 are attached to the respective shafts.

In such a horizontal sealer feed mechanism 500, since the motion flanges 504-504 and the motion links 505-505 function as cranks, the motion flanges 504-504 are rotated by the up and down adjustment arm shaft 59a, so that the vertical movement is achieved. Lower part 4 of sealer mounting table 43
Motion link 505-5 connected to 3a-43a
05 reciprocates the horizontal sealer 5 in the vertical direction (the transport direction of the packaged object (arrow X)). Specifically, the cutter arm 51a-51a and the horizontal sealer arm 51b
When -51b is located at the maximum opening (top dead center), the horizontal sealer 5 is located at the middle point of the movement length. Then, the cutter arm 51a-51a and the horizontal sealer arm 51b-
When the horizontal sealer 5 moves to the vertical sealer 4 side and the horizontal sealer 5 returns to the intermediate point again, the pair of horizontal sealer surface portions 5a and 5b weld and cut the packaging film 24. After the packaging film 24 is welded and cut, the horizontal sealer 5 moves to the discharge conveyor 7 described later and returns to the intermediate point. With this movement, the cutter arms 51a-51a and the horizontal sealer arms 51b-51b separate from each other and move to the top dead center. Return to This series of operations is performed by the motion flange 50.
Since 4-504 is performed during one rotation, continuous operation becomes possible.

Next, a pair of horizontal sealer surfaces 5 shown in FIG.
The operation timing considered from the motion trajectory of one cycle of welding cutting by a and 5b will be described. In addition, the numeral 1 in the figure is a pair of horizontal sealer surface portions 5a, 5a, respectively.
b indicates the top dead center, and numeral 13 indicates the bottom dead center (weld cutting position). First, as can be seen from the motion trajectory, when the pair of horizontal sealer surfaces 5a and 5b are located at the numerals 12 to 14, the pair of horizontal sealer surfaces 5a and 5b are in close contact with the packaging film. When the sealer 5 is moved to the discharge conveyor 7 side, it must be synchronized with the moving speed of the packaging film.

The minimum of the packaging pitch (packing length) is
The length of the packaging film fed during one cycle of welding and cutting by the pair of horizontal sealer surfaces 5a and 5b is equal to the length of the packaging film, and the horizontal sealer 5 is operated continuously. When the packaging pitch is set to be long, the horizontal sealer 5 is stopped in a state where the pair of horizontal sealer surfaces 5a and 5b are open. This stop section is obtained by the following formula: stop section = packaging pitch-minimum pitch.

For the cutting position, for example, the feeding amount of the packaging film is counted by a counter. In this case, adjustment may be made based on the count value. In this case, if a mark that can be detected by the phototube is attached to the packaging film, the detection signal from the phototube becomes a count start signal by the counter. If the cutting position does not require accuracy, the feeding amount of the packaging film may be counted by a timer instead of the counter.

The center conveyor 3 is, as shown in FIG.
Since the power from the electric motor drive unit 6 is transmitted through the center conveyor drive chain 45, the center belt (not shown) can be extended in the transport direction (arrow X) of the article to be packaged. In addition, the center conveyor 3 is connected to an unloading conveyor 7 for unloading the three-side sealed wrapper in which the articles to be packaged are packed. When the cutter arms 51a-51a and the horizontal sealer arms 51b-51b of the horizontal sealer 5 come close to each other, the center conveyor 3 comes into contact with the pair of horizontal sealer surfaces 5a, 5b, thereby welding and cutting the packaging film. Crankshaft 52b of mechanism 52
Is separated from the unloading conveyor 7 by a cam mechanism (not shown) driven by the Also, the cutter arm 51a
When -51a and the horizontal sealer arms 51b-51b move away from each other, the center conveyor 3 approaches the unloading conveyor 7 by the cam mechanism.

As described above, the center conveyor 3 and the unloading conveyor 7 are separated and approached by the cutter arm 51.
This is because the horizontal sealer arms 51b-51b are located below the center conveyor 3 when the horizontal sealer arms 51b-51b are separated from each other,
This is for the purpose of approaching the carry-out conveyor 7 from the center conveyor 3 and smoothly carrying the same during the transfer.

The electric motor driving section 6 employs a double motor system having a first electric motor for driving the vertical sealer 4 and the center conveyor 3 and a second electric motor for driving the horizontal sealer 5. Further, the electric motor drive unit 6 includes a sequence controller having a built-in motor switching control circuit for switching between the two motors according to the drive timing of the vertical sealer 4 and the horizontal sealer 5. This motor switching control circuit, based on a wrapping length setting signal output from a wrapping length adjusting means for setting a predetermined wrapping length in accordance with the vertical dimension of the article to be packaged, the vertical sealer 4 and the center conveyor 3
And the horizontal sealer 5 is driven.

The packaging operation by such a three-side seal film packaging machine will be described below. An operator (operator) guides the packaging film sheet 24 from the former 2 to the vertical sealer 4 in advance, and prepares a three-side seal wrapper for covering the packaged object with the packaging film sheet 24 by the former 2. The heater (not shown) of each sealer is energized in advance and the temperature is controlled so that the packaging film sheet 24 can be welded by the vertical sealer 4 and the horizontal sealer 5.

When an operator (operator) presses a packaging start button (not shown), a motor switching control circuit built in a sequence controller of the electric motor driving section 6 rotates the first electric motor, so that the first electric motor is rotated. Of the electric motor is transmitted to the coupling mechanism 42, and the coupling mechanism 42
1 is driven. Thereby, the vertical sealer 4 is driven by the power from the electric motor drive unit 6.

The power of the first electric motor is transmitted to the center conveyor 3 via the connecting mechanism 42 of the vertical sealer 4 together with the driving of the vertical sealer 4. As a result, the center conveyor 3 rotates, so that the center belt moves in the transport direction (arrow X) of the article to be packaged. Therefore, the packaging film 24 wrapping the packaged articles conveyed by the center conveyor 3 is separated into a pair of vertical sealer surfaces 4a, 4b.
Can be welded.

The motor switching control circuit rotates the second electric motor when the object to be packaged moves by a predetermined wrapping length, so that the power of the second electric motor is supplied to the timing sprocket 53a → the timing chain 53b → the timing sprocket 53c. → the connecting shaft 53e → the timing sprocket 53f → the timing chain 53g → the power is transmitted to the crankshaft 52b via the timing sprocket 52a. When the crankshaft 52b rotates, the crank 52c-
52c, 52d-52d are cutter arms 51a-51.
a, and the other 5a of the horizontal sealer surface portion is connected to the crank 52c.
-52c, 52e-52e, and 52f-52f are connected to one side 5b of the horizontal sealer surface via the horizontal sealer arms 51b-51b.
Are reciprocated around the pivot point O so as to move away from each other.

That is, when the pair of horizontal sealer surfaces 5a and 5b located at the top dead center approach each other and come into contact with each other, the packaging film is welded. At this time (during welding contact), the cutter 57 axially mounted on the cutter arms 51a-51a via the upper mounting plate 5e is retracted in the groove 5a 'formed in the other side 5a of the horizontal sealer surface (FIG. 7, see FIG. 8). After welding for a predetermined time, the pair of horizontal sealer surface portions 5a and 5b are further pressed, and one of the pair of horizontal sealer surface portions 5b pushes up the other 5a of the pair of horizontal sealer surface portions against the resilience of the spring 5d. The other 5a of the pair of horizontal sealer surface portions
The cutter 57 jumps out by the amount of retreat, and is housed in the groove 5b 'of one of the pair of horizontal sealer surfaces 5b (see FIG. 9). As a result, the packaging film is cut, so that a three-side sealed wrapper having a predetermined wrapping length can be formed. The pair of horizontal sealer surface portions 5a and 5b can swing to some extent, so that they are closely attached without any gap. Further, the pair of horizontal sealer surface portions 5a and 5b have a pair of guide arms 5 at both ends.
8a and 58b are provided, so that they are closely contacted without causing a surface shift. Therefore, stable welding can be performed.

A pair of horizontal sealer surfaces 5 of the horizontal sealer 5
In the cases (a) and (5b), the pivot point O is driven in synchronization with the film welding / conveying speed of the vertical sealer 4 at the time of welding and abutment by the horizontal sealer feeding mechanism 500. Can be. At this time, the center conveyor 3
Is separated from the carry-out conveyor 7 by a cam mechanism driven by a crank shaft 52b of a crank mechanism 52, and a pair of horizontal sealer surfaces 5a and 5b approach each other in the space and form a horizontal seal by welding and cutting. When the pair of horizontal sealer surfaces 5a and 5b separate from each other, the center conveyor 3 approaches the unloading conveyor 7 by the cam mechanism.

Then, a three-sided seal wrapper having a predetermined wrapper length is formed by welding and cutting by the horizontal sealer 5, and the conveyer 7
After being unloaded from the container, if the operator (operator) or the automatic placing machine places the packaged object on the former 2 at the predetermined position on the packaging film 24, continuous operation can be performed. According to the embodiment of the present invention, the pair of horizontal sealer surfaces 5a and 5b are respectively connected to the arms 51a-51.
Although the horizontal sealer 5 attached to the shafts 51a and 51b-51b is used, the present invention is not limited to this, and a horizontal sealer 5 'as shown in FIGS. 10, 11, and 12 may be used. This horizontal sealer 5 'describes the movement trajectory of the pair of horizontal sealer surface portions 5a, 5b.
An arm that can always be made to move in an arc is used as a pair of horizontal sealer arms 51b-51.
b, 51c-51c and cutter arm 51a-51
a, three arms on one side, and a pair of horizontal sealer surfaces 5a, 5a
b is a pair of horizontal sealer arms 51c-51c,
1b-51b, the cutter 57 is connected to the cutter arm 51a.
-51a.

The structure is the same as that of the above-described horizontal sealer 5 except that the other 5a of the pair of horizontal sealer surfaces is fixed to one of the pair of horizontal sealer arms 51c-51c. I do. However, the guide arms 58a, 58
b is not attached. According to the horizontal sealer 5 'configured as described above, when an operator (operator) prepares a three-sided seal wrapper and presses a packaging start button (not shown), the electric power is supplied similarly to the horizontal sealer 5 described above. The vertical sealer 4 is driven by the power from the motor drive unit 6. In addition, since the power of the first electric motor is transmitted to the center conveyor 3 via the center conveyor drive chain 45 together with the driving of the vertical sealer 4, the packaging film 2 enclosing the object to be packaged.
4 is conveyed by the center conveyor 3 and welded by a pair of vertical sealer surfaces 4a and 4b.

Next, the electric motor driving section 6 is provided with a horizontal sealer 5 '.
Drive. The horizontal sealer 5 'is provided with a cutter arm 51a.
-51a and the other of the pair of horizontal sealer arms 51c-5
The other side 5a of the horizontal sealer surface portion is reciprocated via the pair 1c of the horizontal sealer arms such that the other side 5a of the horizontal sealer surface portion moves away from and approaching each other about the pivot point O. .

That is, when the pair of horizontal sealer surface portions 5a and 5b located at the top dead center approach each other and come into contact with each other, the packaging film is welded. At this time (during welding contact), the cutter 57 fixed to the cutter arms 51a-51a via the upper mounting plate 5e is retracted in the groove 5a 'formed in the other 5a of the pair of horizontal sealer surfaces. After welding for a predetermined time, the pair of horizontal sealer surface portions 5a and 5b are further pressed, and one of the pair of horizontal sealer surface portions 5b pushes up the other 5a of the pair of horizontal sealer surface portions against the resilience of the spring 5d. Therefore, the cutter 57 protrudes by the retreat amount of the other 5a of the pair of horizontal sealer surfaces, and the cutter 57 protrudes by one of the pair of horizontal sealer surfaces 5b.
In the groove 5b '. As a result, the packaging film 24 is cut, so that a three-side sealed zipper having a predetermined zipper length can be formed. In addition, a pair of horizontal sealer surface portions 5
a and 5b are the other 51c of the pair of horizontal sealer arms, respectively.
-51c and one of the pair of horizontal sealer arms 51b-5.
Since it is pivotally attached to the pivot point O via 1b, it can perform an arc motion even if it is pressurized in a contact state (contact state). Therefore, the pair of horizontal sealer surface portions 5a, 5b
Will not create gaps or misalignment,
Stable welding can be performed.

Further, the pair of horizontal sealer surfaces 5a and 5b of the horizontal sealer 5 'can be welded and cut just at the intermediate position between the wrapper and the wrapper similarly to the above-mentioned horizontal sealer 5. Then, after being welded and cut by the horizontal sealer 5 ', a three-sided seal wrapper having a predetermined wrapper length is formed and carried out of the carry-out conveyor 7, and thereafter, an operator (operator) or an automatic placement machine removes the packaged material from the former 2 On the packaging film 2 in its predetermined position
4, the apparatus can be operated continuously.

Further, according to each embodiment of the present invention, the electric motor driving section 6 employs the double motor system. However, the present invention is not limited to this. May be driven. Further, the present invention provides
In the above-described three-side seal film packaging machine, the horizontal inverted pillow three-side seal film packaging has been described. However, the present invention can be similarly applied to a horizontal forward pillow three-side seal film packaging as shown in FIG.

[0047]

As described above, according to the three-side seal film packaging machine of the present invention, a gap is not formed between the pair of horizontal sealer surfaces and no surface deviation occurs, so that stable welding can be performed. Can be.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a horizontal sealer of a three-side seal film packaging machine of the present invention.

FIG. 2 is a top view of the horizontal sealer of FIG. 1.

FIG. 3 is a front view of the horizontal sealer of FIG. 1;

FIG. 4 is an explanatory diagram showing a driving system of the horizontal sealer of FIG. 1;

FIG. 5 is an overall view showing one embodiment of a three-side seal film packaging machine of the present invention.

FIG. 6 is an explanatory diagram showing a state of a heat sealing motion of the three-side seal film packaging machine of the present invention.

FIGS. 7A and 7B are explanatory views showing a driving state of a horizontal sealer of the three-side seal film packaging machine of the present invention, wherein FIG. 7A is a front view and FIG.

FIG. 8 is an explanatory view showing a driving state of a horizontal sealer of the three-way seal film packaging machine of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 9 is an explanatory view showing a driving state of a horizontal sealer of the three-side seal film packaging machine of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 10 is a side view showing another embodiment of the horizontal sealer of the three-side seal film packaging machine of the present invention.

11 is a top view of the horizontal sealer of FIG.

FIG. 12 is a front view of the horizontal sealer of FIG. 10;

FIG. 13 is a simplified view showing another embodiment of the three-side seal film packaging machine of the present invention.

FIG. 14 is an explanatory view showing a horizontal sealer of a conventional three-side seal film packaging machine.

FIG. 15 is an explanatory view showing a horizontal sealer of a conventional three-side seal film packaging machine.

FIG. 16 is an explanatory view showing a horizontal sealer of a conventional three-side seal film packaging machine.

FIG. 17 is an explanatory view showing a main part of a horizontal sealer of a conventional three-side seal film packaging machine.

FIG. 18 is a configuration diagram showing a horizontal sealer of a conventional three-side seal film packaging machine.

FIG. 19 is a diagram illustrating height adjustment of a horizontal sealer.

FIG. 20 is an explanatory view showing the operation of a horizontal sealer of a conventional three-side seal film packaging machine, where (a) shows a state in which a pair of heat seal portions are in contact, and (b) shows a state in which a pair of heat seal portions are in contact. The figure in the state where it was further pressurized.

FIG. 21 is an explanatory diagram showing a movement locus of a pair of heat seal portions in FIG. 20.

FIG. 22 is an explanatory diagram showing preferable sealing pressure conditions for the pair of heat sealing portions in FIG. 20.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Former 3 ... Center conveyor 4 ... Vertical sealer 4a, 4b ... Pair of vertical sealer surface parts 5, 5 ′ ···· Horizontal sealer 5a, 5b ····· A pair of horizontal sealer surface parts 5a ′ ····· Groove 5d bored in the other of the pair of horizontal sealer surface parts Spring 24 Packaging film 51a Cutter arm 51b Horizontal sealer arm 51c Horizontal sealer arm 52 Crank mechanism 57 …… Cutters 58a, 58b …… A pair of guide arms (guides) 500 …… A horizontal sealer feed mechanism

Claims (4)

[Claims] An object to be packaged is wrapped in a packaging film (24) by a former (2) provided on a main body (1), and is conveyed on a center conveyor (3) to be transported on a pair of vertical sealers (4). Welded by the sealer surface portions (4a, 4b), welded by the pair of horizontal sealer surface portions (5a, 5b) of the horizontal sealer (5), and cut by a cutter (57) to form a three-sided seal wrapper having a predetermined wrapping length. A one-sided sealer surface portion (5b) of the pair of horizontal sealers is axially mounted on a horizontal sealer arm (51b), and the cutter is axially mounted on a cutter arm (51a). The lateral sealer arm on which one of the pair of lateral sealer surface portions is axially mounted and the cutter arm on which the cutter is axially mounted are respectively pivotally mounted on a pivot point (O) fixed to the main body. The other of the pair of lateral sealer surface (5a)
Is slidably fitted in a groove (5a ') formed in the hole, and the pair of horizontal sealer surfaces are evacuated to the groove when abutting on welding, and the pair of horizontal sealer surfaces protrude from the groove when cutting after welding. The other side of the pair of horizontal sealer surfaces is elastically connected to the cutter arm via a spring (5d) as described above. 2. The pair of lateral sealer surfaces are provided with guides (58).
The three-side seal film packaging machine according to claim 1, further comprising: a, 58b). 3. A pair of vertical sealers (4) of a vertical sealer (4), in which a packaged object is wrapped in a packaging film (24) by a former (2) provided in a main body (1) and conveyed on a center conveyor (3). Welded by the sealer surface portions (4a, 4b), welded by the pair of horizontal sealer surface portions (5a, 5b) of the horizontal sealer (5 '), and cut by the cutter (57) to form a three-side seal wrapper having a predetermined wrapping length. A three-sided seal film packaging machine to be formed, wherein a pair of horizontal sealer surfaces of the horizontal sealer are fixed to the main body by a pair of horizontal sealer arms (51b, 51c), respectively, and the cutter is fixed to the main body by a cutter arm (51a). The cutter is pivotally attached to a pivot point (O), and the cutter is the other of the pair of lateral sealer surfaces (5a).
Is slidably fitted in a groove (5a ') formed in the hole, and the pair of horizontal sealer surfaces are evacuated to the groove when abutting on welding, and the pair of horizontal sealer surfaces protrude from the groove when cutting after welding. A three-side seal film packaging machine characterized in that one of the pair of horizontal sealer surface portions is elastically connected to the cutter arm via a spring (5d). 4. A horizontal sealer feed mechanism (500) for driving the pivot point in synchronization with a film welding and conveying speed of the vertical sealer when the pair of horizontal sealer surfaces are brought into contact with each other for welding. Item 3. The three-side-sealed film packaging machine according to Item 1, 2 or 3.