JPH0123366B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a container forming device in a packaging machine,
More specifically, in a packaging machine that uses a web as a packaging material and manufactures a rectangular parallelepiped container from the web, the web is formed into a tube and is filled with a content such as a fluid food, and then a content-filled tube is formed. The present invention relates to a container forming apparatus that forms bag-like containers by dividing seals into lengths corresponding to one container.

Conventional technology This type of device includes, for example,
As disclosed in Japanese Patent No. 43427, there is provided a container forming device that clamps and seals a content-filled tube in lengths corresponding to one container, and cuts the middle part of the sealing width, An elevating frame, a pair of swinging arms whose lower parts are attached to the elevating frame with integral parallel horizontal shafts, a pair of jyos fixed to the upper parts of both swinging arms so as to face each other, and both jyoes are connected to each other. The arm opening/closing device is equipped with an arm opening/closing device that swings both swinging arms between a closed position in which the swinging arm approaches a closed position and an open position in which they are separated from each other. What exists is known.

Problems to be Solved by the Invention In the above-mentioned conventional device, considerable parts such as the link mechanism and the cam mechanism are forced to move up and down together with the elevating frame, so the movable parts account for a large amount of weight in the entire device. Become. Therefore, it is necessary to secure a large movable space, which is a factor that hinders the miniaturization of the device.

An object of the present invention is to provide a container forming device for a packaging machine that solves the above problems.

Means for Solving the Problems A container forming device in a packaging machine according to the present invention is a container forming device in a packaging machine, which is different from the above-mentioned conventional container forming device in that the arm opening/closing device moves up and down together with the lifting frame and is passed between both swinging arms. a horizontal airfoil member fixed to the vertical rod for rotation with the vertical rod between both swinging arms; and a pair of horizontal airfoil members attached to each end of the airfoil member. vertical pin,
A pair of horizontal pins are respectively attached to both swing arms so as to be located on opposite sides of the center of rotation of the airfoil member, a bearing holding vertical tube is attached to one end of each, and a bearing holding horizontal tube is attached to each other end. and a pair of connecting rods in which each vertical cylinder is fitted over both vertical pins via a spherical bearing, and the horizontal cylinder is fitted over both horizontal pins via a spherical bearing. It is something to do.

Function The arm opening/closing device of the container forming device includes a vertical rod that can be raised and lowered together with the lifting frame and can be moved up and down and reversibly rotated between both swinging arms, and a vertical rod that rotates together with the vertical rod between both swinging arms. a horizontal airfoil member movably fixed to a vertical rod; a pair of vertical pins each mounted at each end of the airfoil member; A pair of horizontal pins are respectively attached to both swing arms, a bearing holding vertical tube is provided at one end of each, a bearing holding horizontal tube is provided at each other end, and each vertical tube is fitted over both vertical pins. Since the horizontal cylinder is equipped with a pair of connecting rods that are fitted over both horizontal pins, when the vertical rod reversibly rotates, the airfoil member rotates together with the vertical rod, and the pair of connecting rods are connected to each other. It advances and retreats in opposite directions, and as a result, both swing arms swing to open and close.

As both swinging arms swing, the horizontal cylinders of both connecting rods are moved in the vertical direction, and a vertical bending moment about the vertical cylinders is generated in both connecting rods. Since the spherical bearing is interposed between the vertical tubes, the angle of both connecting rods in the vertical direction around the spherical bearing can be freely changed, thereby preventing the generation of bending moments in the vertical direction. As the rods rotate, the vertical tubes of both connecting rods are moved in the length direction of the connecting rods and in a direction perpendicular to that length, causing both connecting rods to move horizontally around the horizontal tubes. A bending moment is about to occur, but since a spherical bearing is interposed between the horizontal pin and the horizontal tube, the horizontal angle of both connecting rods around the spherical bearing can be freely changed, so that the horizontal angle can be changed freely. Bending moments are prevented from occurring.

Embodiments Embodiments of the present invention will now be described with reference to the drawings.

In this specification, "front and rear" means the side perpendicular to the paper surface of Figure 2 and the other side is the front, and the side in front of it is the rear, and left and right means the left side of Figure 2 is the left and the right side is the right. Define.

(A) Overview of the entire container forming apparatus As shown in Figs. 2 and 3, the container forming apparatus consists of a left half and a right half, which have the same configuration but are arranged in different directions. Each part includes a vertical rod 1 that can be raised and lowered and reversibly rotated, and a lifting frame 2 that is attached to the vertical rod 1 so that it can be raised and lowered together with the vertical rod 1 and that the vertical rod 1 can be rotated reversibly.
A pair of front and rear swing arms 5 each supported by the lifting frame 2 so as to swing around a pair of mutually parallel horizontal axes at the bottom;
6, a pair of front and rear jaws 3, 4 fixed to the upper part of each swinging arm 5, 6 so as to face each other, and a closed position where both jaws 3, 4 approach each other and a position where they are separated from each other. an arm opening/closing device that swings both swinging arms 5, 6 between open positions, and generates sealing pressure between the two swing arms 3, 4 by drawing the swinging arms 5, 6 toward each other in the closed position. It is equipped with a press device. Note that of the left and right halves, only the right half will be described below.

Of the two jaws 3 and 4, although not shown, a heat sealing heater is embedded in the front jacket 3, and a cutter is embedded in the rear jacket 4, respectively.

The two elevating frames 2 are synchronously moved up and down alternately in different directions with predetermined strokes.
That is, when one of the elevating frames 2 rises,
The other lifting frame 2 is lowered. When the elevating frame 2 is at the upper limit position of its elevating stroke, both the jaws 3 and 4 close each other, so that the tube W is strongly pressed across a predetermined width and sealed. By lowering both the jaws 3 and 4 together with the elevating frame 2 while pressing the tube W, the tube W is sent by a length corresponding to one container. When the lifting frame 2 reaches the lower limit position, the cutter is activated and the tube W is cut at the center of the height of the seal width. Then, both jaws 3 and 4 open to release the tube W. As a result, a portion corresponding to one container at the tip of the tube W is separated from the other portions.

Above the jaws 3 and 4, although not shown in detail, a pair of front and rear divided rectangular cylindrical movable press molds 7 and a pair of left and right movable lug pieces 8 are provided, respectively. A roller 9 is attached to each movable press die 7, and as these rollers 9 move along the cam 10, the movable press die 7 swings in opposite directions about its lower end. The inner circumferential surface of the movable mold 7 in the mated state is formed in a shape similar to the outer circumferential surface of the final box-shaped container.
By pressing the tube W together with the movable press mold 7, one end of the tube W is formed flat, and its outer peripheral surface is formed as square as possible to form a box-shaped container, and at the same time, the contents of the tube W are is quantified. The movable lug piece 8 has a substantially L-shaped cross section, and is moved in opposite directions around one side of its lower end by a horizontal retractable rod 11 provided at the top of the swing arms 5 and 6 and a rack and pinion (not shown). oscillate. A cam 12 and its follower 13 are connected to the protruding end of the horizontal reciprocating rod 11 for operating the same. The movable lug piece 8 cooperates with the movable mold 7 to form a protruding triangular lug at the end of the flat tube W.

(B) Vertical Rod As shown in detail in FIGS. 4a and 4b, the vertical rod 1 is rotatably and vertically supported by upper and lower bearings 14 and 15 at two locations near the upper end and lower end. vertical rod 1
A spline 16 is provided at the portion received by the lower bearing 15, and a collar 17 is provided following the upper end of the spline 16. Upper bearing 14 is inner and outer rings 18, 1
9 and two upper and lower ball bearings 20 interposed between both wheels 18 and 19.
The inner ring 18 is connected to the vertical rod 1 through the bush 21.
The outer cylinder 19 is slidably fitted onto the outer cylinder 19, and the outer cylinder 19 is fixed to a frame (not shown). Lower bearing 15
consists of two upper and lower ball bearings 24 interposed between inner and outer rings 22, 23 and both rings 22, 23. Inner ring 22 is spline 16
The vertical rods 1 are fitted together so that the vertical rods 1 rotate together with the inner ring 22. Inner ring 2
An arm 25 is fixed to the lower end of the arm 25, and one end of a rod 26 extending from a cam mechanism, which will be described later, is connected to the tip of the arm 25. Outer ring 23
is fixed to the frame 27. At the lower end of the vertical rod 1 protruding downward from the lower bearing 15, there is a vertical rod-shaped connecting member 2 in line with the lower end.
8 is fixed, and a horizontal rod-shaped member 29 is attached to the connecting member 28 orthogonally to the bushing 30.
It is installed through. A pair of vertical parallel rods 31 are provided at both ends of the horizontal rod-shaped connecting member 29.
The lower ends of the two are connected to each other, and the upper ends thereof are connected to a cam mechanism via a frame-shaped connecting member 32.

(C) Elevating Frame As shown in detail in FIGS. 4a and 7, the elevating frame 2 is integrally provided with a vertical cylindrical portion 33 via a connecting portion 34 at an intermediate portion of its outer circumferential length. It consists of a pair of left and right opposing walls 35 and 36. The vertical cylindrical portion 33 is fitted onto the vertical rod 1 via a pair of upper and lower bushes 37 and 38, and is received by the collar 17 thereof. Two through holes 39 and 40 are formed in each of the opposing walls 35 and 36 at a predetermined interval in the front-rear direction. Bearings 41 are fitted into each of the through holes 39 and 40, and these bearings 41
A pair of front and rear horizontal support shafts 42, 43 are supported across the left and right opposing walls 33, 36. Of both opposing walls 35 and 36, the right opposing wall 3
A pair of front and rear rollers 44 are provided on the outer surface of the lift frame 6, and these rollers 44 sandwich a vertical guide rail 46 provided on a column 45 from both front and rear sides, thereby preventing the lifting frame 2 from rotating. (See Figure 2). Further, a lid 47 which also serves as a bearing holder is provided at the open end of each of the through holes 39 and 40.

(D) Swinging arm Both swinging arms 5 and 6 have their lower ends fixed to a pair of horizontal support shafts 42 and 43 in the front-rear direction, as shown in FIGS. 4a, 7, and 11. Oblate rectangular parallelepiped blocks 48, 49 with thickness
, horizontal bars 50 and 51 placed on the tops of blocks 48 and 49 so that the left half of their lengths protrude to the left of blocks 48 and 49;
It consists of prismatic blocks 52 and 53 with approximately square cross sections suspended from the lower surfaces of the protrusions 0 and 51. A pair of jaws 3 and 4 are fixed to opposing surfaces of both prismatic blocks 52 and 53 in a protruding manner, respectively.

(E) Arm opening/closing device The arm opening/closing device is shown in Figures 1, 4a, and 5.
6 and 6, the reversible rotation of the lifting rod 1, which is reversibly rotated by a cam mechanism to be described later, is converted into the swinging of both swinging arms 5, 6. The vertical rod 1 is arranged so as to rotate together with the vertical rod 1 between the movable arms 5 and 6.
A horizontal airfoil member 58 is fixed to the airfoil member 58, a pair of vertical pins 59 are respectively attached to both ends of the airfoil member 58, and a pair of vertical pins 59 are positioned on opposite sides of each other with the center of rotation of the airfoil member 58 in between. A pair of horizontal pins 56 are attached to both swing arms 5 and 6, respectively, and a bearing holding vertical cylinder 5 is attached to each end.
4a, 55a are bearing holding horizontal cylinders 54 at each end.
b, 55b are provided and each vertical cylinder 54a, 5
5a is fitted over both vertical pins 59 via spherical bearings 60, and horizontal cylinders 54b and 55b are fitted over both horizontal pins 56 via spherical bearings 57, respectively;
55.

The horizontal airfoil member 58 is fitted and keyed to the vertical rod 1 at the center of rotation so as to press down the vertical cylindrical portion 33 of the lifting frame 2 from above, and is fitted onto the vertical rod 1 from above the airfoil member 58. The vertical rod 1 is loaded with a bag nut 61.
The airfoil member 58 is thus fixed to the vertical rod 1.

When the vertical rod 1 is raised or lowered, the lifting frame 2 is raised or lowered together with the airfoil 58 accordingly. On the other hand, when the vertical rod 1 is reversibly rotated, the airfoil member 58 rotates in the same direction together with the vertical rod 1, and the pair of rods 54 and 55 connected thereto cause the swing arms 5 , 6 swing between a closed position in which they are mutually upright and an open position in which they are tilted upwardly.

(F) Press device Referring to FIG. 3, FIG. 8, and FIG. A pair of left and right fixed engagement members 63 each having a recess 62 and an engagement recess 6 of each fixed engagement portion 63
A movable engagement member 64 having two engaged downward engagement protrusions 65 is provided. Each movable engagement member 64 is attached to a piston rod 67 of a hydraulic cylinder 66, as shown in detail in FIGS. 11 and 12. Fluid pressure cylinder 6
6 passes through the prismatic block 52 of the front swing arm 5 and has a pair of bushes 6 in the block 52.
They are respectively integrally provided at both ends of a horizontal main rotation shaft 69 which is rotatably supported via a shaft 8.
The fluid pressure cylinder 66 has a built-in double compression coil spring 70 that biases the piston rod 67 in the direction of protrusion, and a through hole 71 that communicates between the two fluid pressure cylinders 66 is opened in the axial direction of the main rotation shaft 69. It is being Of both the left and right fluid pressure cylinders 66, a hollow sub-rotation shaft 72 for supplying working fluid is attached to the right side of the right fluid pressure cylinder 66, and a flange 73 provided at its left end is bolted to the main rotation shaft. It is fixed concentrically with the shaft 69. The auxiliary rotation shaft 72 passes through the upper part of the flat rectangular parallelepiped block 48 of the front swing arm 5, and is rotatably supported by the block 48. A connector 74 is attached to the right protruding end of the sub-rotation shaft 72, and a hydraulic oil pipe (not shown) is connected to this. An operating lever 75 is attached to the sub-rotating shaft 72 so as to be in contact with the flange 73 thereof. The operating lever 75 includes a boss 77 that is rotatably fitted to the sub-rotating shaft 72 via a bush 76, a downward arm 78 that projects downward from the boss 77, and a forward arm 79 that projects forward from the boss 77. It has a forked upward arm 80 that projects upward from the boss 77. A roller 8 is installed at the tip of the downward arm 78.
1 is installed. A horizontal rectangular flat plate-shaped pushing piece 82 is fixed to the rear swinging arm 6 so as to be located behind the roller 81 . Push piece 82
The tip is formed in a front upward slope, and this contacts the roller 81 in the latter half of the swing movement of both swing arms 5 and 6 from the open position to the closed position, and the operating lever 75 is moved to the 9th position. Rotate counterclockwise in the figure. One end of a tension coil spring 83 is hooked to the tip of the forward arm 79. The other end of the spring 83 is hooked to the left end surface of the front swing arm 5 at a position below the operating lever 75, and the spring 83 causes the operating lever 75 to rotate clockwise in FIG. Forced. One end of a reciprocating rod 84 is connected to the tip of the upward arm 80 via a horizontal pin 85. A step 86 is formed in the middle of the length of the advance/retreat rod 84, and the step 86
A small diameter portion 87 is formed from one end to the other end. On the other hand, of both fluid pressure cylinders 66, a rectangular flat rod receiving plate 88 is provided on the front surface of the right fluid pressure cylinder 66, and the right half of the right fluid pressure cylinder 66 is
The small diameter portion 87 of the reciprocating rod 84 slidably passes through this rod receiving plate 88 via a bush 89, and the step 86 abuts the rear surface of the rod receiving plate 88. ing. A spring receiver 90 is provided at the other end of the advance/retreat rod 84.
is fixed, and a compression coil spring 91 fitted in the small diameter portion 87 is interposed between the spring receiver 90 and the rod receiving plate 88.

Assume that both swing arms 5 and 6 are now swinging from the open position toward the closed position. At this time, the movable engagement member 64 is maintained in an upward position tilted upward from the state perpendicular to the front swing arm 5, as shown by the chain line in FIG. Eventually, when both swing arms 5 and 6 reach the vicinity of the closed position, the pushing piece 82 comes into contact with the roller 81 and pushes it. Then, the operating lever 7
5 rotates counterclockwise in FIG.
8, but the compression coil spring 91 prevents this, and this spring 91 causes the rod receiving plate 88 to rotate counterclockwise along with the hydraulic cylinder 66 about the main and sub rotation axes 69 and 72. Rotate in the direction. As a result, the movable engagement member 64 rotates together with the fluid pressure cylinder 66, changes from an upward position to a horizontal position, and is engaged with the fixed engagement member 63. In this state, when the hydraulic cylinder 66 is supplied with working fluid and the piston rod 67 is retracted, the movable engagement member 64 moves forward together with the piston rod 67, and both engagement members 63 and 64 are attracted to each other. A sealing pressure is generated between both jaws 3,4. When both the engaging members 63 and 64 are engaged with each other, there is a slight gap C between the two jaws 3 and 4, but when both the engaging members 63 and 64 are drawn together, that gap C is disappears. In this case, both swing arms 5 and 6 will fall slightly inward from their upright state (see FIG. 10). At this time, in order for the movable engagement member 64 to maintain a horizontal position, it is necessary for the movable engagement member 64 to be in a slightly upward position with respect to the front swing arm 5. By compressing and relatively rotating the fluid pressure cylinder 66 and the actuating lever 75 in opposite directions, the posture can be changed.

(G) Cam mechanism Figures 13 to 17 show a cam mechanism for raising and lowering the vertical rod 1 and reversibly rotating it.

A horizontal cam shaft 92 extending in the left-right direction is supported by a bracket 93 so as to be located obliquely below the rear end of the vertical rod 1. camshaft 92
sprocket 94 in order from right to left,
Two rod lifting plate cams 95, 96 and 1
Two rod rotating plate cams 97 are fixed (left and right are shown reversed in FIG. 15).
The two rod lifting plate cams 95 and 96 have different cam contours, and each cam contour corresponds to the stroke amount of the lifting frame 2. Two rod lifting plate cams 95, 96
One common rod lifting cam follower 9
8, one rod rotation plate cam 97 is provided with another rod rotation cam follower 99, respectively. Cam follower 98 for rod lifting
is a piece of groove-shaped steel having an inverted U-shape in cross section, and has a top wall 100 and left and right side walls 10.
1 and 102, and extends in the front and rear direction over the two rod lifting cams 95 and 96, and has a bracket 93 at the rear end.
The rectangular frame-shaped connecting member 32 described above is attached to the front end of the horizontal shaft 103 so as to be adjustable in length. A projecting ear 104 is integrally provided on the upper surface of the mid-length portion of the top wall 100, and a rod 105 of a fluid pressure cylinder for follower restraint is connected to this projecting ear 104. 1st
As shown in FIG. 5 and FIG. 17, both walls 10
A pair of parallel guide rods 106 at the front and rear are fixed across the guide rods 1 and 102, and a movable piece 107 is supported by these guide rods 106. A roller 108 is connected to the horizontal pin 107 on the movable piece 107.
It is attached in a downwardly protruding manner through the
Piston rod 1 of thin fluid pressure cylinder 110
11 is connected to the right side of the movable piece 107. The hydraulic cylinder 110 is attached to the outer surface of the right side wall 102, and the piston rod 111 passes through the right side wall 102. As shown in FIG. 16, the rod rotation cam follower 99 has an L shape when viewed from the front, and has a boss 113 supported by another horizontal shaft 112 provided on the bracket 93.
, a forward protruding arm 114 extending forward from the boss 113 , and two upwardly protruding arms 115 and 116 extending upward from the boss 113 . A roller 117 is attached to the tip of the forward protruding arm 114, and this is in contact with the rod rotation plate cam 97. The other end of the rod 26 whose one end is connected to the arm 25 is connected to one of the two upwardly projecting arms 115, 116, and the piston rod 119 of the follower restraining hydraulic cylinder 118 is connected to the other end.

When the camshaft 92 rotates, its rotational motion is
It is converted into reciprocating motion by either of the two rod lifting cams 95, 96 and the cam follower 98, and is transmitted to the vertical rod 1.
goes up and down. The vertical stroke of the vertical rod 1 corresponds to the length of one container of the tube W, so when changing the length, the thin fluid pressure cylinder 110 is actuated to move the movable piece 1.
07, and the roller 108 moving together changes from a state in which it is in contact with one of the two plate cams 95, 96 to a state in which it is in contact with the other. On the other hand, the rotational movement of the camshaft 92 is controlled by the rod rotation cam 97 and its follower 9.
9 converts it into a reciprocating motion and transmits it to the rod 26, which causes the rod 26 to reciprocate in its length direction. Then, the arm 25 connected to the rod 26 swings, and the vertical rod 1 reversibly rotates together with the inner ring 22.

Effects of the Invention According to this invention, when the vertical rod reversibly rotates, the airfoil member rotates together with the vertical rod, causing the pair of connecting rods to advance and retreat in opposite directions, and as a result, both swing arms swing. The mechanism for opening and closing the swing arm is simple, and the movable parts that move together with the lifting frame are relatively small.

As both swing arms swing, a vertical bending moment about the vertical tube is generated in both connecting rods, but the vertical angle of both connecting rods can be freely changed around the spherical bearing. This prevents the generation of a bending moment in the vertical direction, and as the horizontal rotating body rotates, a horizontal bending moment about the horizontal cylinder tends to occur in both connecting rods, but the spherical bearing Since the angles of both connecting rods can freely change in the horizontal direction around the center, the generation of bending moments in the horizontal direction is prevented. The arm can be opened and closed smoothly.

[Brief explanation of drawings]

The drawings show embodiments of the invention, and FIG. 1 is a perspective view of an arm opening/closing device showing the main parts of the invention. FIG. 2 is a rear view showing almost the entire container forming apparatus, and FIG. 3 is a left side view of the right half of the apparatus as indicated by the - line in FIG. 2. Figures 4a and 4b are enlarged sectional views taken along the - line in Figure 3, and Figure 5 is an enlarged sectional view of the
The - line in Figure a shows a side view of the swinging arm, lifting frame, etc., Figure 6 is a plan view showing the arm opening/closing device along with the cross-section of the swinging arm along the - line in Figure 4a, and Figure 7 shows the swing arm in Figure 4a. FIG. 6 is a perspective view of the portion shown in FIGS. 4b to 6; FIG. 8 is a perspective view of the press device, and FIGS. 9 and 10 are explanatory views of the operation of the press device. Fig. 11 is a rear view of the front swinging arm including a fractured cross section taken along the line XI-XI in Fig. 5, and Fig. 12 is a horizontal sectional view of the front swinging arm taken along the line XII-XII in Fig. 11. . 13 is a perspective view of the cam mechanism, FIG. 14 is a front view of the cam mechanism, and FIG. 15 is a vertical cross-sectional view of the cam mechanism taken along the - line in FIG. 14. Figure 16 is the 15th
17 is a partially enlarged sectional view of the cam follower taken along the line - in FIG. 14. 2... Lifting frame, 3, 4... Jiyo, 5,
6... Swinging arm, 42, 43... Support shaft, 5
4, 55... Connection rod, 54a, 55a... Vertical tube, 54b, 55b... Horizontal tube, 56... Horizontal pin, 57, 60... Spherical bearing, 58... Airfoil member, 59... Vertical pin , W... Tube.

Claims (1)

[Scope of Claims] 1. A container forming device that clamps a content-filled vertical tube W into lengths corresponding to one container, seals a required width, and cuts the middle part of the sealed width. A lifting frame 2, and a pair of parallel horizontal shafts 4 at the bottom of the lifting frame 2.
A pair of swing arms 5, 6 attached at 2, 43, a pair of jyos 3, 4 fixed to the upper part of both swing arms 5, 6 so as to face each other, and both jyos 3, 4. An arm opening/closing device that opens and closes both swinging arms 5 and 6 so as to approach and separate from each other, and a container forming device for a packaging machine, wherein the arm opening/closing device moves up and down together with the lifting frame 2 and swings both of them. A vertical rod 1 that can be raised and lowered and reversibly rotated is passed between the arms 5 and 6, and a horizontal rod that is fixed to the vertical rod 1 so as to rotate together with the vertical rod 1 between both swinging arms 5 and 6. An airfoil member 58, a pair of vertical pins 59 respectively attached to both ends of the airfoil member 58, and both swing arms 5 located on opposite sides of the rotation center of the airfoil member 58. , 6, a pair of horizontal pins 56, each having a bearing holding vertical cylinder 54a, 55a at one end, a bearing holding horizontal cylinder 54b, 55b at the other end, and each vertical cylinder 54a, 55a having a spherical surface. A pair of connecting rods 54 and 55 each fitted over both vertical pins 59 via bearings 60, and horizontal tubes 54b and 55b each fitted over both horizontal pins 56 via spherical bearings 57. A container forming device in a packaging machine characterized by: