JPS60228209A - Regulating mechanism of movement of elastic plate material molding cylindrical bag body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for adjusting the forward and backward movement of an elastic plate for forming a cylindrical bag, and more specifically, a belt-like web is formed into a cylindrical bag, A novel mechanism for continuously variably adjusting the opening diameter of a tubular body formed by a tubular bag forming device used in a bag-forming-fill-sealing machine that seals after filling an article. The content is as follows.

Vertical pillow packaging machines, horizontal pillow packaging machines, 3-side seal packaging machines, 4-side seal packaging machines, etc. form a packaging material web into a cylindrical bag, fill this bag with various articles, and then BACKGROUND OF THE INVENTION A web former, generally called a former, is used in a bag making, filling and packaging apparatus that automatically packages articles by applying a seal. This web forming machine is used to form a packaging web (a general term for polyethylene sheets and other synthetic resin films) unwound from a roll of raw material into a cylindrical bag. Various types of web forming machines have been proposed in the past6, and this web forming machine is generally of a fixed type in which the diameter of the bag formed by the web forming machine cannot be changed. When changing the diameter of a cylindrical bag in a bag filling and packaging device, pre-prepared molding tools of various sizes can be used as appropriate, depending on the desired opening size of the bag. There is. However, replacing the web forming tool requires extremely complicated work, and the operation of the bag-forming-fill-sealing apparatus must be temporarily stopped for the replacement work, which causes a decrease in work efficiency.

Considering that there is a demand for changing the dimensions of the cylindrical bag depending on various factors such as the shape, dimensions, and capacity of the packaged items,
The present applicant has made a useful proposal regarding a web forming machine that enables the forming of cylindrical bags of any diameter by variably adjusting the bag making width, and this is the invention ``Film Forming Apparatus J (Japanese Patent Application No. No. 58-227679), a patent application has been completed.

The gist of the invention is to fix and hold one end of an elastic plate made of a long material with high flexibility, and to extend the plate diagonally upward in a loop starting from the fixed part. The other end on the return side crosses the front of the fixed part and extends diagonally downward, and is attached to the advancing/retracting mechanism, so that the loop formed in the plate material is freely formed by the advancing/retracting movement of the advancing/retracting mechanism. The reason is that it is structured so that it can converge and expand.

By the way, the mechanism for adjusting the forward and backward movement of the elastic plate that was proposed and implemented in the above-mentioned invention "Film forming apparatus" is large in size due to its structural limitations, and furthermore, the operating handle is located diagonally below the machine frame. It had inherent drawbacks such as being difficult to use.

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 it at the front of the machine frame.

In order to achieve the above object, the mechanism for adjusting the forward and backward movement of an elastic plate for forming a cylindrical bag according to the present invention comprises extending an elastic plate made of a highly flexible elongated material with one end fixedly held diagonally upward. In an apparatus for forming a cylindrical bag, the elastic plate material is returned in a loop shape so that the other end of the elastic plate crosses in front of the fixing part, and the elastic board crosses the front of the fixing part and extends diagonally downward. A return side of the existing elastic plate material is held under pressure by a pair of rollers, and a means for rotationally driving the rollers is provided,
Accordingly, the elastic plate material is moved forward and backward to freely converge and expand the loop.

Next, a mechanism for adjusting the forward and backward movement of the elastic plate material forming the cylindrical bag according to the present invention will be described in detail below with reference to the accompanying drawings, using preferred embodiments. FIG. 1 is a plan cross-sectional view showing a schematic structure of a web forming apparatus in which the mechanism for adjusting the forward and backward movement of an elastic plate according to the present invention is suitably implemented, and FIG.
3 is a sectional view taken along the line ■-■ of FIG. 2;
The figure is a sectional view taken along the line N-■ in FIG. 1.

In the figure, reference numeral 10 indicates a long elastic plate material with high flexibility, such as a stainless steel plate, and one end of this elastic plate material 10 is arranged so as to be movable relative to the machine frame 12 shown in FIG. The mounting member 18 is fixed to the supporting member 14 by bolts 16 via suitable fixing means 20. The other end of the elastic plate 10 is attached to a forward/backward adjusting mechanism 22 according to the present invention shown in FIGS. 1 to 4, so that it can move forward and backward.

The other end of the long elastic plate 10 extends obliquely upward from the side fixedly held by the mounting member 118, and is inclined at a predetermined angle α with respect to the perpendicular H as shown in FIG. After drawing a clockwise loop, it returns toward the fixed part. 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 to a pair of rollers provided in the advance/retreat adjustment mechanism 22 according to the present invention. It is held under pressure by 24 and 26. The support member 14 is capable of moving toward and away from the elastic plate holding member 28 within the machine frame 12 under the action of a relative movement mechanism to be described later.

'The advancement/retraction adjustment mechanism 22, which forms the gist of the present application, will be explained in more detail. As shown in Figures 1 and 5,
The other end of the elastic plate 10, which has returned after extending in a clockwise loop, crosses the front of the mounting member 18 in a non-contact manner and extends diagonally downward, as described above. 1
8 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. Since the guide passage G is for slidably guiding the elastic plate 10, it is positioned so that the elastic plate 10 is installed at an angle that corresponds to a trajectory that extends diagonally downward after returning in a loop. Of course, it is set.

The elastic plate material 10 that has passed through the guide path G is held under pressure by a pair of rollers 24 and 26 rotatably mounted on the support member 14, and is moved forward and backward by the rotation of these rollers, so that the elastic plate material 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.
A pair of roller support plates 36 and 38 are vertically fixed to the back side of the elastic plate 4 with bolts 39 with a spacing slightly larger than the width of the elastic plate 10. This roller support plate 3
Below 6, 3.8 (on the side close to the support member 14),
A rotating shaft 40 on the driving side is rotatably supported.
A drive roller 24, preferably made of a material with a large friction coefficient such as hard rubber, is inserted and fixed in the middle of the roller 0. One end of the rotating shaft 40 is attached to one roller support plate 3.
A bevel gear 42 is fixedly protruding outwardly from the other roller support plate 38, and a spur gear 44 is attached to the other end protruding outwardly from the other roller support plate 38. Furthermore, the roller support plate 36.3
8 (on the side away from the support member 14), there are rectangular openings 46, respectively, as can be seen from the plan view in FIG.
A bearing 48 having a shape shown in FIG. 3 is inserted into this rectangular opening 46 so as to be slidable along the opening 46. Further, the bearing 48 is connected to another roller 26 (this roller 26 is connected to the roller 24 with the elastic plate 10 in between) which is interposed between the roller support plates 36 (38).
The driven-side rotating shafts 52, each of which has a fixed shaft inserted therein (so as to be in rolling contact with each other), are each freely rotatably supported. One end of this driven-side rotating shaft 52 protrudes outward from the roller support plate 38 to which a spur gear 54 is fixed, so as to be meshed and connected to another spur gear 44 described above. Note that the bearing 4
8, the free ends of adjustment bolts 50 screwed vertically into the tops of the roller support plates 36 (38) come into contact with each other, and the rotation of the bolts 50 causes the rollers 24° 2
Six rolling blades are provided in a freely adjustable manner.

As shown in FIGS. 1 and 4, a sleeve 56 is horizontally attached to the vertical front surface (operating side) of the machine frame 12, and a handle shaft 58 is rotatably inserted and supported through the sleeve 56. A handle 60 is fixed to the end of the handle shaft 58 that protrudes outward from the machine frame, and a thrust key 62 is protruded from the shaft extending inward of the machine frame. The protruding region of the thrust key 62 of the handle shaft 58 is inserted into another bevel gear 64 whose center hole is formed with a thrust groove 63 shown in FIG. This bevel gear 64 is the first
As is clear from the figure, it is rotatably inserted and supported by the support member 14 and meshes with the bevel gear 42 attached to the drive-side rotating shaft 40 orthogonal to the handle shaft 58.

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 attached to the holding member 28 as described later. Even if you move relatively,
The bevel gear 64 is allowed to slide in the axial direction.

Therefore, when the handle 60 is rotated in a predetermined direction, the handle shaft 58. The drive-side rotating shaft 40 rotates via the bevel gear 64 and the bevel gear 42, thereby causing the roller 24 to rotate.
drive the rotation. The roller 26 also rotates via the spur gears 44, 54, and the elastic plate lO held under pressure by both rollers 24, 26 is moved forward and backward along the guide path G.

That is, if the elastic plate 10 is moved forward in the direction of the arrow in FIG. 2, the loop made of the elastic plate expands in a direction that increases the diameter, and conversely, if it is moved backward in the direction of arrow B, the loop expands. It will be appreciated that the diameter may be reduced in a converging direction.

Next, referring to FIG. 1, a mechanism for relatively moving the support member 14 and the holding member 28 will be briefly explained. This relative movement mechanism is arranged so that when the elastic plate material 10 is converged and expanded in the web forming device, a substantially uniform circular loop can be obtained without moving the center point. be. In this embodiment, as shown in FIG. 1, a pair of threaded shafts 66.6 each having a reverse thread
8 are rotatably but not axially movably inserted into shaft supports 78 protruding from appropriate positions on the bottom surface of the machine frame 12 at their center portions (no screws are threaded here). Supported. One end of each of the pair of threaded shafts 66 and 68 is connected to a guide nut 8 fixed to the holding member 28.
It is inserted and screwed to 0.82. Also screw shaft 66.68
The other end of each is threaded through a guide nut 84,86 which is also fixed to the support member 14. Further, a timing pulley 70 and a handle 72 are coaxially fixed to the end (operating side) of the one screw shaft 68 that projects from the machine frame 12. A timing pulley 74 is also fixed to the other end of the other screw shaft 66 that projects outward from the machine frame 12, and as shown in FIG. 6, the two timing pulleys 70.
A timing belt 76 is wound around the belt 74 . Note that the reference numeral 88 indicates a tension adjustment roller.

Each of the threaded shafts 66 and 68 has a reverse thread, and the threading direction of the threaded portion screwed onto the support member 14 and the holding member 28 are screwed onto each of the threaded shafts 66 and 68. The threading directions of the threaded portions are set in opposite directions. Therefore, if the handle 72 is rotated in a predetermined direction in FIG.
are rotated in opposite directions, thereby causing the support member 14 and the retaining member 28 to move toward and away from each other.

The holding member 28 is provided with a height-adjustable upright member 92 as shown in FIG. 5, and the elastic member 10 is
The rear lower end of the holder is slidably attached to the holder.

Further, as shown in FIGS. 1 and 5, an upright member 92 is fitted into a longitudinal groove bored on the back side of the holding member 28 so as to be slidable in the vertical direction, and by tightening a bolt 94. The upright member 92 is held at a desired height, and any desired height can be set by loosening the bolt 94 and raising or lowering the upright member 92.

In FIG. 1, reference numeral 96 indicates a roller. This roller 96 has the function of contacting and guiding a belt-shaped web 98 coming from a web supply source (not shown) and smoothly feeding the web 98 into a loop-shaped web former formed by the elastic plate 10.

Next, the operation and effect of the elastic plate advance/retreat adjusting mechanism according to the present invention will be explained. In FIG. 1, the diameter of the web former formed by the loop of the elastic plate 10 is 1.
Assume that it is 30mm. If a cylindrical bag with an opening diameter of 90 mm is required depending on various requirements such as the shape of the packaged object 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 handle shaft 58 connected to the handle 60 is rotated in a predetermined direction. Drive-side rotating shaft 40 via bevel gear 64 and bevel gear 42
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 both rollers 24
, 26 is moved backward in the direction of arrow B along the guide path G. In other words, the elastic plate 10 gradually converges its loops and reduces its diameter. When the diameter of the loop in the planar state reaches 90 mm, the rotation of the handle 6o is stopped, and the web forming machine made of the elastic plate 10 forms a cylindrical bag with a desired opening diameter. This means that possible dimensions have been set.

By the way, since the distance between the mounting member 18 that fixedly holds one end of the elastic plate 10 and the holding member 28 that is attached with the upright member 92 that guides and holds the lower end surface of the loop is constant, If the handle 60 is simply rotated, the convergently obtained loop will take on an elliptical shape with the long axis along the X-axis, making it impossible to maintain a nearly perfect circle. Therefore, the handle 72 provided in the above-mentioned relative movement mechanism
The screw shaft 66.6 has a reverse thread cut by rotating the screw shaft 66.6.
．． 8, the pair of support members 14 and holding members 28 are moved relatively closer to each other, and 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 loop diameter in the initial setting state is 130I.
The opening diameter of the cylindrical film packaging bag is larger than IllI,
For example, if you want to obtain 150 mm, you can perform the opposite operation to the above-mentioned operation. That is, when the handle 60 provided on the advancing/retracting mechanism 22 is rotated in the direction in which the elastic plate IO moves forward in the direction of the arrow, the loop made of the elastic plate 10 gradually opens and its diameter increases. Then, the handle operation can be stopped at the position where the diameter reaches the desired diameter of 1501 mm. Note that 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 to separate the support member 14 and the holding member 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.

A web 98 is supplied via the roller 96 to a web former made of the elastic plate material 10 formed into a loop of a desired diameter, and is fed into the web former as shown in FIGS. 1 and 5. As a result of the squeezing, a cylindrical bag of the desired diameter is formed. Depending on the diameter of the loop and the angle of entry of the web 98 fed through the rollers 96, it is preferred to set the height of the upright member 92 to the most appropriate value.

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 is large in size due to its structural limitations. Since the operation handle is located diagonally below the machine frame, it has inherent drawbacks such as being 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 have a more compact structure. At the same time, by locating the operating section on the front side of the machine frame, the above-mentioned drawbacks were completely eliminated, and the usability was significantly improved.

Although the foregoing forward/backward adjustment mechanism is operated by rotating the handle, it is possible to use a hydraulic source capable of forward and reverse driving;
The forward/backward adjusting mechanism may be operated using a pneumatic source, an electric motor, or the like as an actuator.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing a schematic structure of a web forming apparatus in which a mechanism for adjusting forward and backward movement of an elastic plate according to the present invention is suitably implemented;
FIG. 2 is a view taken along the line ■-■ in FIG. 1, showing the overall structure of the advancement/retraction adjustment mechanism according to the present invention, and FIG.
4 is a sectional view taken along the IV-mV line in FIG. 1, 5 is a side view of the web forming device, 6 is a front view of the machine frame, and 7 is a roller support plate. FIG. Patent applicant Fuji Machinery Co., Ltd.

Claims (1)

[Claims] An elastic board made of a highly flexible long material with one end held fixed is extended obliquely upward and then returned in a loop shape.
In a cylindrical bag forming apparatus configured such that the other end side of the elastic plate crosses in front of the fixing part, a pair of return sides of the elastic plates extending diagonally downward across the front of the fixing part are provided. The elastic plate is held under pressure by a roller and is provided with a means for rotationally driving the roller, whereby the elastic plate material is moved forward and backward to freely converge and expand the loop. Advancement/retraction adjustment mechanism for plate materials.