JPH0317696B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention manufactures a package by forming a packaging film into a cylindrical bag, filling the bag with an article to be packaged, and then applying a seal. The present invention relates to an improvement in a film forming apparatus in which the opening diameter of a cylindrical bag formed from the film can be very easily and steplessly adjusted in a bag making, filling and packaging machine.

Prior Art In vertical pillow packaging machines and horizontal pillow packaging machines, a packaging film is formed into a cylindrical bag, a seal is applied in the longitudinal direction, various articles to be packaged are filled into the bag, and then the packaging film is BACKGROUND ART Bag-fill-fill-seal machines that sequentially manufacture required packages by performing directional sealing and cutting are widely used. This bag-forming-fill-sealing machine uses a film forming machine for forming a band-shaped packaging film into a cylindrical bag body, and its mechanism is as follows.
Conventionally, various structures have been proposed.

Problems to be Solved by the Invention The film forming machine is generally of a fixed type in which the diameter of the cylindrical bag formed by the film forming machine cannot be changed. Therefore, when changing the diameter of the packaging bag in the bag-forming-fill-sealing machine,
Depending on the desired size of the cylindrical bag, molding tools of various sizes prepared in advance are used as appropriate. However, replacing the film forming tool requires extremely complicated work, and the operation of the bag-forming-fill-sealing machine must be temporarily stopped for the replacement work, which causes a significant decrease in work efficiency. ing.

In view of the need to change the dimensions of the cylindrical bag according to various factors such as the shape, dimensions, and capacity of the packaged items, we have developed a system that allows the diameter dimension (bag-making width) of the cylindrical bag to be changed. Several proposals have already been made regarding film formers that are adjustable and thus allow the production of cylindrical packaging bags of arbitrary diameter. For example, Japanese Utility Model Publication No. 53-50697 proposes a "film forming machine" in which an overhanging part with an opening is provided in the main body of an automatic packaging machine, and a film forming machine with an L-shaped fitting is attached to this overhanging part. discloses a technical idea in which the gap between the backs of a pair of film formers can be adjusted by loosening and moving the tightening screws of the L-shaped fittings to set an arbitrary bag making width. However, the device according to this invention has the disadvantage that the range of the opening width that can be adjusted is small and that it cannot accommodate changes in the bag diameter over a wide range. Moreover, the configuration is complicated because each L-shaped bracket is attached at two locations on the overhang, and there are also two adjustment locations.
There are inherent drawbacks such as the adjustment operation being troublesome due to the large number of locations.

Further, in Japanese Utility Model Application Publication No. 55-66906, a cylindrical forming tool 20 is constructed by combining two half-cylindrical divided bodies 21 and 22, and these divided bodies 21 and 22 are connected to bolts 24a and 24b. A technical idea is disclosed in which the spacing can be adjusted using nuts 25a and 25b. However, in this invention, a chute 4 which also serves as a forming cylinder is fitted into the inner periphery of the forming tool 20, and the outer circumferential dimension of the chute 4 is fixed. Therefore, the variable adjustment range of the bag making width is extremely limited, and there is a problem in that it cannot be applied at all to adjusting the bag making width over a wide range and is not practical.

Purpose of the Invention The present invention has been proposed in view of the above-mentioned drawbacks inherent in the film forming device (former) used in the bag-forming-fill-sealing machine and the like according to the prior art, and to suitably solve the problem. The opening diameter of the packaging bag made of a cylindrical film can be freely adjusted according to the shape of the contents, the amount of filling, and other user needs, and the cylindrical packaging has various opening sizes and is stable in shape. It is an object of the present invention to provide a novel film forming apparatus capable of manufacturing bodies.

Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the present invention provides a method for forming a band-shaped packaging film fed from a roll into a cylindrical shape during the feeding process. In this film forming apparatus, one end of an elastic plate made of a long material with high flexibility is fixedly held at a predetermined angle with respect to the feeding line of the cylindrical film, and the elastic plate is fixed to the cylindrical film. A loop is drawn and extended in the direction opposite to the film feeding direction, and then returned, the return side of the plate intersects the fixed side, and the end of the return side is attached to the reciprocating feed mechanism. By driving the advancing and retracting feeding mechanism, the loop formed by the elastic plate material is freely converged and expanded, and the outer surface of the elastic plate material is parallel to the feeding line of the cylindrical film or parallel to the feeding line of the cylindrical film. The strip-shaped film is arranged to spread in the feeding direction of the elastic plate, and the strip film is guided inward along one longitudinal edge of the looped elastic plate; A position substantially opposite to the intersection of the elastic plates,
A holding member whose position is adjustable parallel to the feeding line of the cylindrical film, and an interval between the holding member and the fixed side of the elastic plate relative to each other in a plane perpendicular to the feeding line of the cylindrical film. The present invention is characterized in that the present invention is characterized in that it is configured such that the shape of the loop formed by the elastic plate material can be changed by providing a relative moving means that can be adjusted in a fixed manner, and operating the relative moving means.

Examples Next, regarding the film forming apparatus according to the present invention,
Preferred embodiments will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a long elastic plate material such as a stainless steel plate that is highly flexible, and one end of this plate material 10 is arranged so as to be relatively movable in a rectangular frame 12 shown in FIG. is fixed to the fixed side of the supporting member 14 via a bolt 16,
The other end of the plate 10 is attached to an advancing/retracting mechanism 18 shown in FIGS. 1 and 4 so that it can move forward and backward.

That is, as shown in FIGS. 1 and 2, one end of the long elastic plate 10 is attached to a fixing member 22 via the bolt 16, which is attached to the support member 14 via a support shaft 20 of a guide roller, which will be described later. It is held fixed. At this time, the elastic plate material 10
As can be seen from the figure, the cylindrical film 94 is fixed and held at an angle of a predetermined angle θ with respect to the feeding line L. The other end of the elastic plate 10 is formed into a loop diagonally upward in a direction opposite to the feeding direction of the cylindrical film 94, as shown in FIG. It is designed to be drawn, extended, and then returned to. It is assumed that the looped portion of the elastic plate 10 is inclined at a predetermined angle α with respect to the perpendicular H, as shown in FIG.

The return end portion of the elastic plate 10 crosses and passes in front of the fixed portion without contacting it, and then extends diagonally downward as it is to the advancing/retracting mechanism 1 which will be described later.
It is attached to a sliding piece 52 provided at 8 via a bolt 26. The support member 14 can be relatively moved toward and away from another support member 28 within the rectangular frame 12 under the action of a relative movement mechanism to be described later. Therefore,
The outer surface of the elastic plate 10 is parallel to the feeding line L of the cylindrical film 94, or maintains its width in the feeding direction of the cylindrical film 94.

Further, the support member 14 has the advancing/retracting mechanism 1
8 can be attached, so this advancing/retracting mechanism 18 will be explained first. As shown in FIGS. 1 and 4, the other end of the elastic plate 10, which has returned after extending in a clockwise loop,
As described above, the fixing member 22 crosses the front side of the fixing member 22 in a non-contact manner and extends diagonally downward. It is guided and supported by two guide rollers.

That is, an appropriately shaped support plate 32 is attached to the extension portion 30 integrally extending from the support member 14 via bolts 34, and a plurality of support shafts 20 are fixed to this support plate 32 with bolts. has been done. As shown in FIGS. 1 and 4, guide rollers 36a, 36b, and 36c each having a V-shaped groove on the circumferential surface are rotatably attached to the support shaft 20, and two of these guide rollers 36
a and 36b guide and hold the upper end surface of the elastic plate 10 in the longitudinal direction, and guide rollers 36c guide and support the lower end surface of the elastic plate 10 in the longitudinal direction.
The elastic plate member 10 is slidably held between the plurality of guide roller groups. As shown in FIG. 4, the fixing member 22 is attached to the other end of the support shaft 20.

The support plate 32 is arranged so as to extend diagonally downward with respect to the support member 14, and the advance/retreat mechanism 18 is attached to the end thereof. This advancing/retracting mechanism has a configuration as shown in FIGS. 1 and 4, and includes a pair of support blocks 38, 40, a screw shaft 46, and a sliding piece 5 screwed onto the screw shaft 46.
2 and a handle 50.
That is, a pair of support blocks 38 and 40 are fixed to one end surface of the support plate 32 with bolts 42 and 44 spaced apart by a predetermined distance, and a shank portion 48 of a screw shaft 46 is rotatably attached to the one support block 38. It is inserted. The open end of the screw shaft 46 is rotatably inserted into the other support block 40 and supported. A shank portion 48 inserted through the support block 38 projects outwardly, and a handle 50 is fixed to this projection.

A sliding piece 52 is inserted and screwed into the threaded portion of the screw shaft 46 interposed between the pair of support blocks 38 and 40, and the handle 50
By rotating in any direction, the sliding top 52 can move forward and backward along the screw shaft 46 in the directions of arrows A and B. Note that in order to prevent the sliding top 52 from rotating and to guide its smooth sliding, a guide bar 54 made of a round bar is inserted and fixed through both support blocks 38 and 40, and the sliding top 52 is It is freely inserted and supported. Then, on the sliding top 52, a fourth
As shown in the figure, the other end of the elastic plate 10 is fixed via a bolt 56. Therefore, by rotating the handle 50 provided on the advancing/retracting mechanism 18 and moving the sliding top 52 forward and backward in the direction of the arrow, the elastic plate 10 whose other end is fixed to the sliding top 52 can be moved forward and backward in the direction of the arrow.
If the loop is moved forward in the direction of arrow A in FIG. 1, the loop will contract in the direction of convergence, and if it is moved backward in the direction of arrow B, the loop will expand in the direction of increasing its diameter.

Next, referring to FIG. 2, a mechanism for relatively moving the first and third support members 14, 28 will be explained. This relative movement mechanism is provided in the film forming apparatus so that when the elastic plate 10 converges and expands as described later, a substantially uniform circular loop is formed without moving its center point. It is. In this embodiment, a pair of screw shafts 58 and 60 each having a reverse thread are rotatably inserted and supported at both ends in the longitudinal direction of the rectangular frame 12, and the end of one screw shaft 60 protruding from the frame 12 A handle 62 is fixed to one end, and a bevel gear 64 is fixed to the other end. Also,
A bevel gear 66 is also fixed to the other end of the other screw shaft 58 that projects outside the frame, and these bevel gears 64, 66 are rotatably inserted into two bearings 68, 68 attached to the frame 12 and are supported by shafts. Bevel gears 7 provided at both ends of the rotating shaft 70
2 and 74 are engaged as shown.

Further, guide nuts 76 and 78 are screwed onto the pair of screw shafts 58 and 60, respectively, and the support member 28 is fixed to the guide nuts 76 and 78. Further, the support member 14 is inserted and screwed into one screw shaft 58, and the support member 14 is inserted into a guide bar 80 that is commonly inserted into and fixed to the frame 12.
4 and a support member 28 are slidably inserted and guided. The thread cutting direction of the screw shaft 58 screwed onto the support member 14 and the support member 2
The threading direction of the part where 8 is threaded is:
They are set in opposite directions. Therefore, when the handle 62 is rotated in a predetermined direction in FIG.
4 and 28 become relatively close to each other or separate from each other.

Next, as shown in FIG. 3, the support member 28 is provided with a height-adjustable holding member 82, and a slit-like groove formed in the holding member 82 is inserted into the rear lower end of the elastic plate 10. is adapted to be slidably latched. That is, the support member 2
As shown in FIGS. 2 and 3, an upright base 84 that projects vertically from the support member is fixed to 8 through bolts 86. A holding member 82 having the shape shown in FIG.
By tightening the holding member 82, the holding member 82 is held at a desired height, and by loosening the bolt 90 and moving the holding member 82 up and down, an arbitrary height can be set. As described above, a slit-shaped groove is bored at the tip of this holding member 82, and the lower end surface of the elastic plate 10 falls into this groove, allowing the plate 10 to slide freely and stably. It is designed to be held at a predetermined height. In this case, the holding member 82 supports the cylindrical film 94 at a position substantially opposite to the intersection thereof parallel to the feeding line L of the cylindrical film 94 so as to be freely adjustable.

Note that the roller 92 shown in FIGS. 2 and 3 is
It has the function of contacting and guiding a band-shaped film 94 coming from a film supply source (not shown) and smoothly feeding the film 94 toward the loop-shaped film forming machine formed by the elastic plate 10.

Effects of the Embodiment Next, the actual use of the film forming apparatus according to the embodiment will be explained. In FIG. 2, it is assumed that the diameter of the film former formed by the loop of the elastic plate 10 is 130 mm. If a cylindrical film packaging bag with an opening diameter of 90 mm is required depending on various requirements such as the shape of the object to be packaged and the filling capacity, the operator would follow the following operating procedure.

First, the advancing/retracting mechanism 18 shown in FIGS. 1 and 4
Rotate the handle 50 provided in the predetermined direction,
The screw shaft 46 connected thereto is rotated to move the sliding top 52 forward along the guide bar 54 in the direction of arrow A. As a result, the bolt 5 is attached to the sliding piece 52.
The elastic plate member 10 attached via 6 is also pulled in the direction of arrow A. However, one end of the elastic plate 10 is fixedly held by the fixing member 22, and the lower end of the loop formed by the elastic plate 10 is slidably held by the holding member 82. As the sliding top 52 moves forward in the direction of arrow A, the elastic plate 10 gradually converges and its diameter decreases. Then, when the diameter of the loop in the planar state reaches 90 mm, the rotation operation of the handle 50 is stopped. As a result, the dimensions of the film forming machine made of the elastic plate material 10 are set such that a cylindrical film packaging bag having a desired opening diameter can be formed.

By the way, the supporting member 2 is equipped with the fixing member 22 that fixes and holds one end of the elastic plate 10 and the holding member 82 that guides and holds the lower end surface of the loop.
Since the distance between the handle 50 and the handle 50 is constant, the loop obtained convergently as shown in FIG. 2 is an elliptical shape with the long axis along the , and it becomes impossible to maintain a nearly perfect circle. Therefore, the handle 62 provided on the above-mentioned relative movement mechanism is rotated to rotate the threaded shafts 58, 60 having reverse threads. As a result, the pair of support members 14 and 28 are moved relatively close to each other, so that the long axis in the x-axis direction is
Adjust it so that it almost matches the short axis in the axial direction. At this time, the point C, which is approximately at the center of the loop formed by the elastic plate 10, is as shown in FIG.
By setting the screw shafts 58 and 60 to be located on a straight line connecting the branch points C ₂ and C ₃ where the reverse threads are threaded, the support members 14 and 28 can be relatively close to each other.・Even if separated,
The center point C of the loop does not shift.

Conversely, the diameter of the loop in the initial setting state
If it is desired to obtain an opening diameter of a cylindrical film packaging bag larger than 130 mm, for example 150 mm, the above-mentioned operation may be reversed. In other words, the advancing/retracting mechanism 1
When the handle 50 provided at 8 is rotated in the direction in which the sliding top 52 retreats in the direction of arrow B, the other end of the elastic plate 10 attached to the sliding top 52 is pushed back and gradually moves the loop. It will expand and increase its diameter. Then, the diameter is the desired
All you have to do is stop operating the handle when it reaches 150mm. At this time, the loop is formed into an ellipse whose major axis is the y-axis in FIG. 2. Therefore, by rotating the handle 62 provided on the relative movement mechanism to separate both the support members 14 and 28, a nearly perfect circle is formed in which the short axis in the x-axis direction substantially coincides with the long axis in the y-axis direction. You can get a loop.
In this case as well, the center point of the loop formed by the elastic plate 10 hardly moves for the same reason as mentioned above, which is preferable.

In this manner, a film 94 is supplied via the roller 92 to a film forming apparatus made of the elastic plate material 10 formed into a loop of a desired diameter. That is, as shown in FIGS. 3 and 1, the band-shaped film 94 is attached to the elastic plate 1 forming the loop.
As a result of being guided inwardly along one longitudinal edge of the bag, a packaging bag of the desired diameter is produced. Note that the diameter of the loop and the roller 9
It is preferable that the height of the holding member 82 is set to the most appropriate value depending on the entrance angle of the film 94 fed through the film 94.

Effects of the Invention As explained in detail above, according to the film forming apparatus according to the present invention, one end of the elastic plate made of a highly flexible long material is fixed, and the other end is fixed by winding it into a loop shape. By connecting to an advancing/retracting mechanism and operating the advancing/retracting mechanism, the loop can be converged and expanded to arbitrarily set its diameter within a predetermined range. Therefore, the opening diameter of the cylindrical film formed by the film forming machine made of the loop can be set to any size. In addition, a holding member is provided that supports the elastic plate at a position substantially opposite to the intersection thereof in parallel with the feeding line of the cylindrical film in an adjustable manner, and a fixed side of the elastic plate and a side substantially opposite thereto are provided. Since the spacing between the elastic plates can be relatively adjusted in a plane perpendicular to the feeding line of the cylindrical film, there is an advantage that the shape of the loop formed in the elastic plate can be easily changed.

Although the explanation has been made on the case where a stainless steel plate is used as the elastic plate material, various other materials can be suitably used as long as they are flexible and elastic and have the same effect. As long as it satisfies the requirements, for example, a synthetic resin plate can be used satisfactorily. Further, although the forward/backward mechanism has been described as an example in which it is operated by rotating the handle, the forward/backward mechanism may be operated using a hydraulic source, pneumatic source, or other electric motor capable of forward and reverse driving as an actuator.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing a preferred embodiment of the film forming apparatus according to the present invention, FIG. 2 is a plan view showing the overall structure of the apparatus according to the present embodiment, and FIG. FIG. 4, which is a side view of the device according to the example, is a plan view of the advancing/retracting mechanism suitably used in the device according to the present example, as viewed from the - line direction in FIG.

Claims (1)

[Scope of Claims] 1. A film forming device for forming a band-shaped packaging film fed from a roll of material into a cylindrical shape during the feeding process, which is made of a long material with high flexibility. One end of the elastic plate is fixed and held at a predetermined angle with respect to the feeding line of the cylindrical film, and this elastic plate is extended in a loop in a direction opposite to the feeding direction of the cylindrical film. A loop is formed by the elastic plate material by causing the plate material to return and intersect the return side of the plate material with the fixed side, and then attaching the end portion of the return side to a forward/backward feeding mechanism and driving the forward/backward feeding mechanism. The outer surface of the elastic plate is arranged parallel to the feeding line of the cylindrical film or widened toward the feeding direction of the cylindrical film. The film is configured to be guided inward along one end edge in the longitudinal direction of the elastic plate forming the loop, and has a position substantially opposite to the intersection of the elastic plate.
A holding member whose position is adjustable parallel to the feeding line of the cylindrical film, and an interval between the holding member and the fixed side of the elastic plate relative to each other in a plane orthogonal to the feeding line of the cylindrical film. 1. A film forming apparatus, comprising: a relative moving means that can be adjusted in a fixed manner; and by operating the relative moving means, the shape of the loop formed by the elastic plate material can be changed.