JPH0317693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a film forming apparatus, and more particularly, to a method for reducing the opening diameter of a cylindrical bag formed by a film forming apparatus of a bag making, filling and packaging machine. The present invention relates to an improvement in a drive mechanism that can be adjusted in stages quickly and reliably.

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.

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.

Therefore, in view of the need to change the dimensions of the cylindrical bag according to various factors such as the shape, size, and capacity of the packaged object, we have developed a cylindrical bag with an arbitrary diameter by making it possible to variably adjust the width of the bag. The applicant of the present invention has made a useful proposal regarding a film molding machine that can mold bodies, and a patent application has been filed for this invention as an invention "Film Molding Apparatus" (Japanese Patent Application No. 58-227679).

Problems to be Solved by the Invention By the way, the mechanism for adjusting the forward and backward movement of an elastic plate disclosed as an example in the pending application for the above-mentioned invention "Film forming device" is large in size due to its structural limitations. The operating handle was located diagonally below the machine frame, making it difficult to use.

Purpose of the Invention The present invention has been devised in order to solve the above-mentioned disadvantages inherent in the mechanism for adjusting the forward and backward movement of elastic plates. The purpose is to improve usability by locating the operating section on the front of the machine frame.

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. The film is drawn in a loop in a direction opposite to the feeding direction of the film, is extended, and then returned, and after the return side of the plate intersects the fixed side, the end of the return side is connected to a pair of rollers and the roller. A configuration in which the loop formed by the elastic plate material is freely converged and expanded by being held under pressure by a forward/backward feeding mechanism comprising a rotational drive means and by rotating a pair of rollers in the forward/backward feeding mechanism in forward and reverse directions. At the same time, the outer surface of the elastic plate material is disposed so as to be parallel to the feeding line of the cylindrical film or widen toward the feeding direction of the cylindrical film, and the strip-shaped film draws the loop. It is characterized in that it is configured to be guided inward along one end edge in the longitudinal direction of the elastic plate material.

Examples Next, regarding the film forming apparatus according to the present invention,
Preferred embodiments will be described below with reference to the accompanying drawings. Reference numeral 10 in Figures 1 and 2
shows a long elastic plate material with high flexibility, such as a stainless steel plate, and one end of this elastic plate material 10 is fixed to a mounting member 18, which will be described later, via an appropriate fixing means 20, and the elastic plate material 10 The other end of the first
Advancement/retraction adjustment mechanism 22 according to the embodiment shown in FIGS.
It is attached to the machine so that it can move forward and backward. The attachment angle of the elastic plate 10 to the attachment member 18 is inclined by a required angle with respect to the feeding line of the cylindrical film (not shown) in the front view of FIG. Further, as shown in FIG. 1, the mounting member 18 is fixed via a bolt 16 to a support member 14 which is disposed so as to be movable relative to the machine frame 12.

The other end of the long elastic plate 10 is attached to the mounting member 1
8, and extends diagonally upward in a loop in a direction opposite to the feeding direction of the cylindrical film, and as shown in FIG. It is designed to return toward the fixed part with an inclination of . The other end on the return side of the elastic plate 10 crosses and passes in front of the fixed part without contact, and then extends diagonally downward and connects the pair of forward and backward adjustment mechanisms 22 according to the embodiment. It is held under pressure by rollers 24 and 26. Note that the support member 14 can move toward and away from the elastic plate holding section 28 within the machine frame 12 under the action of a relative movement mechanism to be described later. With such a configuration, as can be seen from FIGS. 1 and 5, the outer surface of the elastic plate 10 is parallel to the feeding line of the cylindrical film, or the outer surface of the elastic plate 10 is parallel to the feeding line of the cylindrical film. It is something that expands in the direction.

The advancement/retraction adjustment mechanism 22, which forms the gist of the present application, will be explained in more detail. As shown in FIGS. 1 and 5, the other end of the elastic plate 10, which has returned after extending in a required loop, crosses the front of the mounting member 18 without contact, as described above. It extends obliquely downward and passes through a guide passage formed between the mounting member 18 and the guide member 30. That is, as shown in FIG. 2, a guide groove 32 having a U-shaped cross section is recessed in one flat surface of the guide member 30 made of a rectangular plate material. The guide passage G is formed by overlapping the guide member 30 on the mounting member 18 so as to face the member 18, and then tightening both members with the bolts 34. Note that the guide path G is
Since the elastic plate 10 is slidably guided, it goes without saying that the elastic plate 10 should be positioned at an angle that matches the trajectory that extends diagonally downward after returning in a loop. be.

The elastic plate 10 that has passed through the guide path G is held under pressure by a pair of rollers 24 and 26 rotatably attached to the support member 14, and is moved forward and backward by the rotation of these rollers, so that the elastic plate 10 is fed out. and retreat, so that the diameter of the loop formed by the elastic plate 10 can be freely converged or expanded. That is, as is clear from FIG. 3, which is shown as a cross section taken along the line - in FIG. 2, the support member 14
A pair of roller support plates 36, 3 are provided on the back surface of the elastic plate 10 with a spacing slightly larger than the width of the elastic plate 10.
8 is vertically fixed by bolts 40. Below the roller support plates 36 and 38 (support member 14
A rotating shaft 40 on the driving side is rotatably supported on the rotating shaft 40 (on the side close to Fixed.

One end of the rotating shaft 40 protrudes outward from one roller support plate 36 to which a bevel gear 42 is fixed, and the other end protrudes outward from the other roller support plate 38 to which a spur gear 44 is attached. has been done. Furthermore, above the roller support plates 36 and 38 (support member 14
As can be seen from the plan view of FIG. 7, rectangular openings 46 are formed on the sides (separated from A bearing 48 is slidably inserted along the opening 46. Further, the bearing 48 is
Another roller 26 interposed between the roller support plates 36 (38) (this roller 26 is connected to the elastic plate 1
The driven-side rotating shafts 52, each of which has a fixed shaft inserted therein (which is adapted to be in rolling contact with the roller 24 with the roller 24 sandwiched therebetween), are each rotatably supported.

One end of the driven rotation shaft 52 protrudes outward from the roller support plate 38 to which a spur gear 54 is fixed.
It is adapted to be meshed and connected to the other spur gear 44 mentioned above. Note that the free ends of adjustment bolts 50 screwed perpendicularly into the tops of the roller support plates 36 (38) come into contact with the bearings 48, and the rotation of the bolts 50 causes the rollers 24,
The rolling force between 26 and 26 is adjustable.

As shown in FIGS. 1 and 4, a sleeve 56 is horizontally attached to the vertical front surface (operation side) of the machine frame 12, and a handle shaft 58 is attached to the sleeve 56.
is inserted and supported so that it can rotate freely. Handle shaft 5
A handle 60 is fixed to the end of the handle 8 projecting outward from the machine frame, and a thrust key 62 is protruded from the shaft extending inward of the machine frame. The protruding area of the thrust key 62 on the handle shaft 58 is
It is inserted into another bevel gear 64 which has a thrust groove 63 shown in FIG. 4 in its center hole. As is clear from FIG. 1, this bevel gear 64 is rotatably inserted into and supported by the support member 14, and meshes with the bevel gear 42 attached to the drive-side rotating shaft 40 perpendicular to the handle shaft 58. There is. Note that the handle shaft 58 has its thrust key 62 fitted into the thrust groove 63 (FIG. 4) of the bevel gear 64, so that the support member 14 that pivotally supports the bevel gear 64 is held against the holding member 28 as described later. This allows the bevel gear 64 to slide in the axial direction even if the bevel gear 64 moves relatively.

Therefore, when the handle 60 is rotated in a predetermined direction, the drive-side rotating shaft 40 rotates via the handle shaft 58, the bevel gear 64, and the bevel gear 42.
This drives the roller 24 to rotate. The roller 26 also rotates via the spur gears 44, 54, and the elastic plate 10 held under pressure by both rollers 24, 26
are moved forward and backward along the guide path G. That is, if the elastic plate 10 is moved forward in the direction of arrow A in FIG. 2, it will expand in a direction that increases the diameter of the loop made of the elastic plate, and if it is moved backward in the direction of arrow B,
This reduces the diameter of the loop in the direction of convergence.

Next, in FIG. 1, a mechanism for relatively moving the support member 14 and the holding member 28 will be briefly explained. , are arranged so that a substantially uniform circular loop can be obtained without moving the center point. In this embodiment, as shown in FIG. 1, a pair of screw shafts 6 each having a reverse thread are used.
6 and 68 are rotatably but immovable in the axial direction on shaft supports 78 protruding from appropriate positions on the bottom surface of the machine frame 12 at their central portions (no screws are threaded here). It is inserted through and supported. One end of each of the pair of threaded shafts 66, 68 is connected to a guide nut 80, 82 fixed to the holding member 28.
It is inserted and screwed into.

Further, the other end of each of the screw shafts 66 and 68 is connected to a guide nut 8 similarly fixed to the support member 14.
4, 86 and is screwed on. Furthermore, a timing pulley 70 and a handle 7 are attached to the protruding end (operation side) of the one screw shaft 68 from the machine frame 12.
2 are coaxially fixed. Further, a timing pulley 74 is fixed to the other end of the other screw shaft 66 that protrudes outward from the machine frame 12, and as shown in FIG. It is wrapped. Note that the reference numeral 88 indicates a tension adjustment roller.

The threaded shafts 66 and 68 are both threaded with reverse threads, and the threading direction of the threaded portion threaded onto the support member 14 and the holding member 28 are threaded onto each other. The threading directions of the threaded portions are set in opposite directions. Therefore, in FIG. 1, when the handle 72 is rotated in a predetermined direction, the screw shafts 66 and 68 connected by the timing pulleys 70 and 74 and the timing belt 76 are rotated in opposite directions, thereby causing the support member to rotate. 14 and the holding member 28 will move toward or away from each other.

The holding member 28 is provided with an upright member 92 whose height is adjustable as shown in FIG. It is adapted to be slidably latched. Further, the holding member 2
As shown in FIGS. 1 and 5, an upright member 92 is fitted into the vertical groove bored on the back side of the 8, so as to be slidable in the vertical direction, and by tightening a bolt 94, the upright member 92 is maintained at a desired height, and any desired height can be set by loosening the bolt 94 and raising and lowering the upright member 92.

Note that the roller 96 shown in FIG.
and guide the film 98 against the elastic plate 1.
It functions to smoothly feed the film into the loop-shaped film forming machine formed by the film forming machine.

Effects of the Embodiment Next, the actual use of the film forming apparatus according to the embodiment will be explained. In FIG. 1, 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 bag with an opening diameter of 90 mm is required depending on various requirements such as the shape of the packaged item and the filling capacity, the operator will follow the following operating procedure. First, the handle 60 provided on the advancing/retracting mechanism 22 shown in FIGS. 1 to 4 is rotated in a predetermined direction, and the drive side rotating shaft 40 is rotated through the handle shaft 58, bevel gear 64, and bevel gear 42 connected thereto. The roller 24 attached to the roller 24 is driven to rotate. Further, the roller 26 is also rotated by a spur gear 44 connected to the drive side rotating shaft 40 and a spur gear 54 meshing with the spur gear 44, and the elastic plate 10 held under pressure by both rollers 24 and 26 is moved along the guide path G. It is then moved backward in the direction of arrow B. In other words, the elastic plate 10 gradually converges its loops and reduces its diameter. Then, when the diameter of the loop in the planar state reaches 90 mm, if the rotation operation of the handle 60 is stopped,
This means that the dimensions of the film forming apparatus made of the elastic plate 10 are set such that a cylindrical bag having a desired opening diameter can be formed.

By the way, the holding member 2 is equipped with the mounting member 18 that fixedly holds one end of the elastic plate 10 and the upright member 92 that guides and holds the lower end surface of the loop.
8 is constant, the loop obtained convergently by only rotating the handle 60 will have an elliptical shape with the long axis along the x-axis, which is close to a perfect circle. It becomes impossible to maintain a circular shape. Therefore, by rotating the handle 72 provided on the above-mentioned relative movement mechanism and rotating the threaded shafts 66 and 68 having opposite threads, the supporting member 14 and the holding member 28 are brought relatively close to each other. The rotation is adjusted so that the long axis in the x-axis direction substantially coincides with the short axis in the y-axis direction.

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. That is, when the handle 60 provided on the advance/retreat mechanism 22 is rotated in the direction in which the elastic plate 10 moves forward in the direction of arrow A, the loop made of the elastic plate 10 gradually opens and its diameter increases. . Then, you only need to stop operating the handle when the diameter reaches the desired 150 mm. At this time, the loop is formed into an ellipse whose major axis is the y-axis. Therefore,
By rotating the handle 72 provided on the relative movement mechanism and separating the support member 14 and the holding member 28, they are shaped into a perfect circle with the short axis in the x-axis direction substantially coinciding with the long axis in the y-axis direction. You can get a close loop.

In this way, the film 98 is supplied via the roller 96 to the film forming apparatus made of the elastic plate 10 formed into a loop of a desired diameter. As shown in FIGS. 1 and 5, the band-shaped film 98 is guided inward along one end edge in the longitudinal direction of the elastic plate 10 drawing the loop, so that it has a desired diameter. A cylindrical bag is formed. It is preferable to set the height of the upright member 92 to the most appropriate value depending on the diameter of the loop and the angle of entry of the film 98 fed through the roller 96.

Effects of the Invention As explained in detail above, the mechanism for adjusting the forward and backward movement of the elastic plate proposed in the invention "Film forming apparatus" related to the applicant's previous application has been enlarged due to its structural limitations. In addition, the operation handle was located diagonally below the machine frame, making it difficult to use. However, according to the mechanism for adjusting the forward and backward movement of elastic plates according to the present invention, the mechanism can be made smaller and more compact. By changing the structure and positioning the operating section on the front side of the machine frame, we were able to completely eliminate the above-mentioned drawbacks and significantly improve usability.

Although an example has been described in which the forward/backward adjustment mechanism is operated by rotating the handle, the forward/backward adjusting 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 drawings]

FIG. 1 is a plan sectional view showing a schematic structure of a film forming apparatus according to a preferred embodiment of the present invention, and FIG. 2 is a view taken along the line - - of FIG. The overall structure of the apparatus is shown, and FIG. 3 is a sectional view taken along the line - in FIG. 2, FIG. 4 is a sectional view taken along the line taken in FIG. 1, and FIG. 5 is a side view of the film forming apparatus. 7 is a front view of the machine frame, and FIG. 7 is a plan view of the roller support plate.

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 fixedly 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. After the return side of the plate crosses the stationary side, the end of the return side is held under pressure by a forward/backward feeding mechanism consisting of a pair of rollers and a means for rotating the rollers, and the forward/backward feeding is performed. By rotating a pair of rollers in the mechanism forward and backward, the loop formed by the elastic plate material can be freely converged and expanded, and the outer surface of the elastic plate material is connected to the feeding line of the cylindrical film. The strip-shaped film is disposed in parallel with or spread out in the feeding direction of the cylindrical film, and the strip-shaped film extends inward along one longitudinal edge of the looped elastic plate. A film forming apparatus characterized in that it is configured to be guided.