JPH0723361Y2 - Film folding machine with automatic packing machine - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> This invention is used in an automatic packaging machine for producing a package with a gusset, and has a crease habit at a predetermined position of a strip-shaped film in the same direction as its traveling direction. The present invention relates to a device for attaching a film folding line.

<< Prior Art >> Conventionally, for example, a strip-shaped film that is continuously drawn out is formed into a tubular shape by a bag-making device disposed in the middle of the withdrawal, and an object to be packaged is formed in the tubular film formed into the tubular shape. Are sequentially supplied at predetermined intervals. Then, while the tubular film and the object to be packaged move together, a vertical seal is applied to the polymerized end of the tubular film, and further, a seal is cut in the lateral direction between the objects to be packaged to manufacture a package. There is an automatic packaging machine that does this.

Then, depending on the shape of the packaged object accommodated in the completed package, the completed package does not have the corners and has a rounded shape, so that a high-class feeling cannot be obtained. In addition, a gusset may be formed by inserting a folding claw in the center of the thickness (height) of the tubular film immediately before making a seal cut in the lateral direction, and in such a case, the tubular film has a certain thickness. If it is not formed, the height direction position of the folding claw is fixed, so that the folding claw cannot be accurately inserted in the center of the tubular film in the thickness direction.

For this reason, a beautiful package in which the end seals of the completed package are evenly folded and folded is not manufactured, which is unsightly.

Therefore, in order to give the feeling that the corners of the completed package are angular without being influenced by the shape of the object to be packaged and to allow the folding claw to be easily inserted into the center of the package, for example, As shown in Japanese Utility Model Laid-Open No. 55-84201, various devices have been proposed in which a band-shaped film which is being transferred is previously given a crease habit.

That is, in the apparatus proposed in the above publication, as shown in FIG. 6, a pair of relatively wide curling rollers B and B'arranged so as to sandwich the strip-shaped film A are arranged to face each other. Then, on the outer peripheral surface of one of the protuberance rollers B, two convex stripes C, C and a concave groove D arranged between both convex stripes C, C are provided so as to surround the convex groove C and the concave groove D. There is also one in which two concave grooves D and one convex line C are formed on the outer circumference of the other forming roller B ′ so as to be engaged with. Then, by passing the strip-shaped film F between the habit forming rollers B and B ′, the ridge line habit is imparted by being pinched by the convex strip C and the concave groove D arranged above and below.

<< Problems to be Solved by the Invention >> However, in the above-described conventional apparatus, in order to form a constant crease habit at a predetermined position of the strip-shaped film, the protruding height of the ridge C and the depth of the concave groove D, and Each habitual roller B,
The shapes of B'need to be the same, and
It is necessary to ensure that almost the same clamping pressure is applied to the strip film at each point where the strip film is bent and that the gap between the rollers B and B'is not less than the minimum dimension value. Therefore, it is required to maintain the machining dimensional accuracy of each member and the assembly dimensional accuracy of those members with high accuracy, which makes the adjustment at the time of assembly very complicated and reduces the manufacturing cost. Was difficult. If such adjustment is not successful, not only a certain crease habit is not formed, but also the belt-like film in the course of transfer may meander or be damaged.

Furthermore, since the habit forming rollers B and B'are integral with each other, it is impossible to adjust the position in the direction orthogonal to the traveling direction of the strip-shaped film (adjust the interval between the folding line habits). For this reason, when changing the interval of each folding line habit due to the reason that the intermediate position of the completed package is different, etc., there is a problem that it is necessary to replace with a habit forming roller manufactured to an appropriate size each time. is there.

The present invention has been made in view of the above-mentioned problems, and the purpose thereof is to easily accommodate packaging forms having different sizes, and further, without requiring much machining accuracy for individual parts. An object of the present invention is to provide a film crease forming device in an automatic packaging machine capable of surely forming a crease form on a strip-shaped film.

<< Means for Solving the Problems >> In order to achieve the above-mentioned object, the apparatus for forming a film folding line in the automatic packaging machine according to the present invention is a means for forming a continuously drawn strip film into a tubular shape, and A vertical sealing device that vertically seals the overlapping end of the tubular film formed in a tubular shape, and a substantially central portion in the height direction of both side surfaces of the tubular film, which is disposed in front of the longitudinal sealing device in the traveling direction. Automatic packaging including a gusset forming device that folds toward the inner package to form a gusset, and an end seal device that is arranged immediately in front of the gusset forming device in the advancing direction and performs a sealing cut in the width direction of the tubular film. A device for forming a film crease, which is used in a machine and is disposed behind the means for forming a cylinder, in order to add a crease habit to a gusset formation site. A pair of first habit forming roller devices arranged in the width direction of the band-shaped film, and a package manufactured by the automatic wrapping machine arranged on both sides of both of the first habit forming roller devices. Each pair of second creases that add a crease to the corners
The first and second habit forming roller devices each have a front side roller and a back side roller which are arranged on both sides with the front and back sides of the strip-shaped film sandwiched therebetween. One of the back side roller and the back side roller is individually movably locked to a shaft provided in the width direction of the strip-shaped film along the width thereof, and the other roller is provided in the width direction of the strip-shaped film. A slide member that is individually movably engaged along the guide member is attached to the corresponding one roller via a support member so as to be movable toward and away from the corresponding roller.
The supporting member includes an urging means for moving the other roller closer to the one roller, and a gap adjusting means for restricting the other roller to move closer to adjust the gap between the one roller and the other roller. Is provided, and on the outer peripheral surface of the front side roller and the back side roller of each of the habit forming roller devices, a convex strip is formed along one of them and a concave groove corresponding to the convex strip is formed on the other side. The convex strip and the concave groove are arranged opposite to each other in the first habit forming roller device and the second habit forming roller device.

<< Embodiment >> A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

First, referring to FIG. 1, an example of an automatic wrapping device in which the crease forming device of the present invention is used will be described. As shown in FIG. 1, the band-shaped film 1 has a larger number of tension rollers 3 than the original film 2. Are continuously drawn out, and are formed into a tubular shape by the bag-making device 4 disposed in the middle to form a tubular film 5.

On the other hand, a supply conveyor 6 is disposed behind the bag making machine 4 in the traveling direction, and the carry-out end of this supply conveyor 6 is the bag making machine 4.
It is located near the entrance of the. The supply conveyor 6 has a pair of sprockets 7, 7 '.
It is composed of an endless chain 8 provided in between and fingers 9 arranged at predetermined intervals of the endless chain 8. Then, the object 10 to be packaged is pushed by the fingers 9, and the object 10 to be packaged is sequentially transferred into the tubular film 5 at predetermined intervals.

Further, the packaged object 10 pushed by the fingers 9 moves together with the tubular film 5, and the vertical sealing device 11 arranged at the next stage of the bag making device 4 superposes the tubular film 5 on the way. A vertical seal is applied to the end 12.

Then, the longitudinally sealed tubular film 5 is further advanced, and a predetermined position on both side surfaces in the traveling direction is folded inward by a gusset forming device and an end seal device 14 (not shown) arranged in the next stage. As a result, a gusset is formed, and the portion where the gusset is formed is sealed and cut in the lateral direction of the traveling direction to manufacture the package 15 with the gusset.

Next, an embodiment of the film folding line forming device according to the present invention will be described with reference to FIGS. 2 to 5. In the film folding line forming device 20, the strip-shaped film 1 is continuously drawn out to form a cylinder. Before being formed into a shape, that is, at a predetermined position behind the bag making machine 4 in the traveling direction (see FIG. 1).

Then, the side plates 21, 21 are placed at predetermined positions of the automatic packaging machine (not shown).
Formed upright, and the strip-shaped film 1 is placed between the side plates 21 and 21.
The intermediate shaft 22 is rotatably provided in the width direction of the. The base ends of the rocking levers 23, 23 are mounted on both ends of the intermediate shaft 22, respectively, and the rotary shaft 25 is rotatably mounted on the tip ends of the rocking levers 23, 23. Has been done. On the other hand, the operating rod of the cylinder 26 is connected to the base end side of the swing lever 23, whereby the rotary shaft 25 can swing about the base end of the swing lever 23.

Further, a predetermined number (six in this embodiment) of front side rollers 27 that are in contact with the surface of the strip-shaped film 1 are independently mounted on the rotating shaft 25 so as to be movable in the axial direction. Each of the plurality of front side rollers 27 is a set of three, and in each set, a substantially V-shaped concave groove 28 is formed in the outer peripheral surface of the front side rollers 27a and 27c on both sides, and the front side roller at the center is formed. On the outer peripheral surface of the roller 27b, a convex shape 29 having a substantially mountain-shaped cross section is formed.

That is, in this example, the center side roller 27b and the back side roller 45, which will be described later and which makes a pair with the front side roller 27b and is in contact with the back surface of the strip film 1, give a crease habit to the gusset formation site on the strip film 1. It constitutes a habit forming roller device, and the first habit forming roller device is arranged on both sides in the width direction of the belt-shaped film 1 and provided as a set.

In addition, 2 located on both sides of the first habit forming roller device
One front roller 27a, 27c and the other back roller 45 paired with it
And constitute a second folding-curve roller device for imparting a folding habit to the corner portion of the package, and the second habit-roller device is paired laterally with each first roller device. It is provided.

Further, a first gear 30 is fixed to one end of the rotary shaft 25, and the first gear 30 is not shown in the figure via an intermediate gear 31 attached to the center of the swing lever 23. The second gear 34 fixed to the drive shaft 33 linked to the drive device
Is meshed with. As a result, the power of the driving device (not shown) is transmitted to the rotary shaft 25 via the gears 34, 31, 30 so that the front roller 27 is driven to rotate.

On the other hand, at the predetermined position between the both side plates 21 and 21, the rotary shaft 25
A guide rail 37 is provided in parallel with. This guide rail 37 is a plate-shaped board as shown in FIGS. 3 and 4.
A rail portion 39 having an inverted trapezoidal cross section is integrally formed on the upper surface of 38. And, on this rail part 39, the rail part is
A slide member 40, which has a notch formed substantially in the reference numeral 39, is slidably slidably provided, and is arranged at a position facing the front roller 27.

Further, on both upper side surfaces of this slide member 40, flat rocking plates 41, 41 are provided as supporting members for the back side roller 45, respectively.
Is pivotably attached by a pin 43. This swing plate 41
An elongated concave notch opening upward at the tip of the
44 is bored, and the rotary shaft 46 of the back roller 45 is inserted and arranged between the concave notches 44, 44. The back roller 45 is provided with a convex groove or a concave groove on the outer peripheral surface thereof so as to engage with the concave groove 28 or the convex groove 29 formed on the outer peripheral surface of the front roller 27. That is, the back roller 45 is connected to the front roller 27 via the swing plates 41, 41.
It is possible to move close to and away from.

Further, the back side roller 45 is always urged by the urging means 50 arranged below the back side roller 45 so as to move closer to the front side roller 27 side. That is, the urging means 50 is sandwiched between the rear end portions of the oscillating plates 41, 41, and has a substantially rectangular parallelepiped stopper member 51 and a stopper member 51 penetrating in the stopper member 51 in the front-rear direction and the front-rear direction. The stopper pin 52 screwed so as to be capable of advancing and penetrating in the front-rear direction in the upper part of the above-mentioned slide member 40 and at the tip screw part 53 thereof
a is a pressure adjusting pin 53 screwed to the front surface of the stopper member 51, a head 53b of the pressure adjusting pin 53, and the slide member 4
It is composed of a spring 55 interposed between the front surface of 0 and the front surface in a compressed state.

Then, a slide member for inserting the pressure adjusting pin 53 is inserted.
The inner shape of the through hole 40a formed in the 40 is the pressure adjustment pin 5
Sufficiently larger than the outer shape of 3 and pressure adjustment pin 53
Can swing vertically. Further, by screwing the pressure adjusting pin 53, the screw portion 53a enters into the stopper member 51, the compressive force of the spring 55 is strengthened, and the biasing force of the back roller 45 can be increased.

Further, here, the stopper pin 52 regulates the proximity movement of the back side roller 45, and the gap size between the back side roller 45 and the front side roller 27 can be adjusted according to the thickness of the strip-shaped film 1 sandwiched therebetween. It serves as a gap adjusting means, and the stopper pin 52 adjusts the gap dimension so as not to fall below the minimum dimension value.

Next, the operation of the present embodiment will be described. First, the front side roller 27 and the back side roller 45, which respectively constitute the first and second setting roller devices, are independently arranged along the rotary shaft 25 and the guide rail 37. In this state, the belt-shaped film 1 is moved along the axial direction to be positioned at a predetermined position of the band-shaped film 1 to which the gusset and the corners of the package 15 are bent, and is fixed at that position by a locking means (not shown).

Then, the cylinder 26 is operated and the front roller 27 is rotated.
Move up by 25. At this time, the head force 53b of the pressure adjusting pin 53 is biased forward by the restoring force of the spring 55, and the stopper member 51 is also biased forward accordingly, so that the tip end portion of the swing plate 41, that is, the back roller 45 rotates about pin 43 and tries to move upward. However, when it rises above a certain level, the tip of the stopper pin 52 comes into contact with the rear surface of the slide member 40 and prevents further rise. Therefore, there is a predetermined gap between the front roller 27 and the back roller 45, and the strip film 1 is inserted between them.
Further, the strip-shaped film 1 is set in an automatic packaging machine by a known process.

Next, the cylinder 26 is operated in the reverse order of the above so that the front roller 27
And move it downward to move the strip-shaped film 1 between it and the back side roller 45.
Pinch. Then, as described above, the back roller is
45 is biased upward by the biasing means 50, that is, toward the front side roller 27 at a predetermined pressure. Therefore, the front roller 27
When the strip-shaped film 1 passes between the back side roller 45 and the back side roller 45, the ridges and troughs (or troughs, troughs) (or troughs, troughs) are formed at predetermined positions due to the engagement of the projections and the recessed grooves formed on both rollers 27 and 45. The habit of being broken is added in this order.

At this time, the front roller 27 receives the rotational force of a drive device (not shown) and rotates together with the rotation shaft at substantially the same speed as the strip film 1. The back side roller 45 rotates following the movement of the strip-shaped film 1 or the like.

After that, the packaging body 15 with a gusset is manufactured by a normal process, but since it has a crease habit in advance, it looks like a corner portion is formed and a gusset is surely formed in the central portion in the height direction. A beautiful package will be manufactured.

Further, in the present embodiment, each habit forming roller device is provided with the urging means 50 and the gap adjusting means, and is sandwiched between the front side roller 27 and the back side roller 45 for each habit forming roller device. The holding pressure of the strip-shaped film 1 to be adjusted can be adjusted, and the minimum gap size between the front roller 27 and the back roller 45 can also be adjusted individually. Even if there are variations, the variations in dimensional accuracy can be absorbed, and the clamping pressure and the gap size between the respective protrusive roller devices can be adjusted substantially uniformly and reliably and easily.

Further, in the above-described embodiment, the band-shaped film 1 is bent due to the clamping pressure generated between the rollers 27 and 45, but the clamping pressure alone is sufficient and reliable depending on the material and thickness of the film. When it is not possible to add a linear habit, it is desirable to use a heating means together.

That is, for example, as shown in FIG. 2, a heating means such as a heater 60 can be built in the rotary shaft 25. Also,
As shown in the figure, without incorporating the heater 60, a heating means is arranged immediately before being pinched by both rollers 27, 45, and the belt-shaped film 1 which has been heated and softened by the heating means is placed on both rollers 27, 4
It is also possible to pinch at 5 to add a crease habit.

<< Advantages of the Invention >> As described above, according to the film folding line forming device in the automatic packaging machine according to the present invention, the partial configuration (first and second forming device) for forming the folding line forming pattern on the band-shaped film is integrated. Since the structure is not an independent structure but each structure is independent, it can be easily moved to the crease-fixed position required for various packaging forms, and a gusset is formed at the center in the height direction on both sides of the package. Moreover, the four corners of the package are formed neatly. In particular, the crease habit formed on the band-shaped film by the first gusset forming roller device serves as a guide for the insertion position of the folding claw in the gusset forming device.

Further, each habit forming roller device is provided with a biasing means and a gap adjusting means, and adjusts the holding pressure of the band-shaped film to be held between the front side roller and the back side roller for each individual folding line forming roller device. In addition, since the minimum gap size between the front side roller and the back side roller can be adjusted individually, even if the machining dimensional accuracy of the parts and the assembly dimensional accuracy vary during manufacturing, the dimensional accuracy of those parts can be adjusted. By absorbing the variation, the holding pressure and the gap size between the respective folding line forming roller devices can be adjusted substantially uniformly and reliably and easily. For this reason, the processing dimensional accuracy and the assembly dimensional accuracy of each component can be greatly relaxed, the manufacturing is facilitated, the cost can be reduced, and the crease crease can be surely added.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of an automatic wrapping machine, FIG. 2 is a plan view showing an embodiment of a film folding line attachment device, FIG. 3 is an enlarged side view of essential parts, and FIG. 4 is a perspective view thereof. FIG. 5 is a schematic configuration diagram for explaining the swing mechanism of the front side roller, and FIG. 6 is a front view showing a conventional folding-line bending device. DESCRIPTION OF SYMBOLS 1 ... Band-shaped film, 4 ... Bag-manufacturing device 5 ... Cylindrical film, 11 ... Vertical sealing device 14 ... End sealing device, 27 ... Front side roller 25 ... Rotating shaft, 28 ... Recessed groove 29 ... Relief line, 41 ... Oscillating plate (Supporting member) 45 ... Back roller, 50 ... Biasing means 52 ... Stopper pin (gap adjusting means)

Claims (1)

[Scope of utility model registration request] 1. A means for forming a continuous strip-shaped film into a tubular shape, a vertical sealing device for longitudinally sealing the superposed ends of the tubular film formed in the tubular shape, and the progress of the vertical sealing device. And a gusset forming device for forming a gusset by inwardly folding substantially central portions of both side surfaces of the tubular film inwardly, and the gusset forming device is provided immediately in front of the advancing direction of the gusset forming device. A device for forming a film crease, which is used in an automatic wrapping machine equipped with an end seal device for sealing and cutting in the width direction of the tubular film, and which is disposed behind the means for forming the tubular film in the traveling direction. There is provided a set of first habit forming roller devices arranged in the width direction of the band-shaped film for forming a crease habit in the gusset forming portion, and both of the first habit forming devices. Attaching roller device A pair of second habit forming roller devices which are arranged on both sides and which form a crease habit at a corner portion of a package manufactured by the automatic wrapping machine, and the first and second habit forming roller devices. Each has a front side roller and a back side roller which are arranged on both sides with the front and back sides of the strip film sandwiched therebetween, and one of the front side roller and the back side roller is provided across the width direction of the strip film. The other roller is movably locked along the shaft, and the other roller is supported by a slide member that is individually movably engaged along a guide member that extends across the width of the strip film. Is attached to the corresponding one roller so as to be able to move closer to and away from the corresponding one roller, and the supporting member is provided with an urging means for moving the other roller closer to the one roller, and the other roller. Restrict the proximity movement and Gap adjusting means capable of adjusting the gap is provided, and the outer peripheral surfaces of the front and back side rollers of each of the forming roller devices are formed with ridges on one side thereof and on the other side thereof. A concave groove that corresponds to the convex stripe is formed, and the convex stripe and the concave groove are arranged opposite to each other in the first habit forming roller device and the second habit forming roller device. Film folding line attachment device for automatic packaging machines.