JPH05278729A - Horizontal sealing mechanism in bag making packer - Google Patents

Abstract

PURPOSE:To give a proper horizontal sealing treatment to packing material corresponding to film thickness, material quality and the like. CONSTITUTION:A pair of whirling arms 11 which rotate inwardly each other are provided below a pair of pull-down belts 3 to transfer cylinder-formed packing material S. A pair of horizontal sealing jaws 20 are mounted on the whirling arms 11 to make a horizontal sealing to the packing material S while they are constantly kept in a sealing posture through planet gear mechanisms 21, 22 and 24. On the other hand, a motor 40 for elevating the arms 11 is driven in one or the other direction at a preset timing. Thus, the whirling arms 11 go down together with the packing material S through a movable frame 30 at a connecting position, so that the horizontal sealing jaws 20 can draw an oblong locus including a necessary length of straight running part. Consequently, a proper horizontal sealing is made to the packing material S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral sealing mechanism used in a bag making and packaging machine.

[0002]

2. Description of the Related Art In the process of forming a strip-shaped packaging material into a tubular shape by a former, welding overlapping vertical edges, and then pulling out the tubular packaging material, the lower end of the filling tube is discharged. The vertical pillow packaging machine of the type that simultaneously seals the top part of the packaging material and the base part of the next packaging material by the pair of horizontal sealing members arranged in The device is excellent in workability because it can simultaneously and continuously fill the filling material.

In the device disclosed in Japanese Patent Laid-Open No. 62-235006, the horizontal sealing member is provided in the direction of pulling out the packaging material so that a sufficient time can be taken for the horizontal sealing process even when the heat-sealing cycle is shortened. The heating surface is brought into contact with the packaging material while linearly traveling along.

However, this device has a structure in which the lateral seal member is guided linearly by the D-shaped guide groove as a means for linearly moving the lateral seal member, so that the stroke and pressure contact force are constant. Therefore, depending on the film thickness and material of the packaging material, there is an inconvenience that the packaging material is damaged by applying an unreasonable force, or the lateral sealing process cannot be performed reliably.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to:
It is an object of the present invention to provide a new device capable of arbitrarily adjusting the stroke of the lateral seal member according to the film thickness and material of the packaging material.

[0006]

That is, the present invention provides a lateral sealing mechanism in a bag making and packaging machine for achieving such a subject, as a horizontal sealing mechanism below the packaging material tubular forming means and at the front end driven by the driving means. A pair of turning motion means for rotating the supported horizontal seal member inwardly so as to sandwich the packaging material transfer path is arranged opposite to each other, and at the time when the horizontal seal member has swung to the sealing position, these are moved over a stroke set by these members. Elevating and lowering drive means for moving both of the swivel movement means in the packaging material transfer direction is arranged.

[0007]

EXAMPLES The examples shown below will be described below. FIG. 1 shows a vertical pillow packaging machine provided with a horizontal sealing mechanism according to an embodiment of the present invention. This packing machine is configured as a device of a type that does not use a filling cylinder, and a pair of suction members are provided below a wrapping material S bent in a cylindrical shape by a former 2 attached below a hopper 1. While pulling down belts 3 and 3 with a chamber 4, while adsorbing and holding the outer surface so as to maintain a tubular shape,
At the same time, a vertical seal is performed by the vertical seal jaws 5 at the vertical joint, and the vertical seal jaws 5 are fed to the horizontal seal mechanism 10, which will be described later.

On the other hand, the horizontal seal mechanism 10 disposed below the pull-down belts 3 is roughly classified into a pair of front and rear revolving arms 11 for rotating the horizontal seal jaws 20 while always holding them in a fixed direction. 11 and an arm-elevating drive motor 40 for vertically moving the movable shaft 30 that supports each of the swiveling arms so that the lateral sealing jaws 20 and 20 can draw a required elliptical locus. ..

FIG. 2 is a cross-sectional view showing one of the turning arms 11, 11 in detail. The turning arm 11 is formed in a U-shape by a connecting shaft 13 for connecting the left and right arms 12, 12. In addition, these arms 12,
One of the base ends of the arm 12 has a support shaft 14 projecting inward from one side plate 31 of the movable frame 30, and the other arm 12 has a base end protruding inward of the other side plate 32. The shafts 15 are fixed to the shafts 15 and are configured to rotate about these shafts 14 and 15 by the driving force transmitted to the input shaft 15.

Reference numeral 17 denotes a sleeve for loosely inserting the seal jaws into the coupling shaft 13 for supporting the seal jaws. The transverse seal jaws 20 for horizontally sealing the tubular packaging material S are fixed to the sleeve 17, and the sleeve 17 has a sleeve. A planetary gear 21 having the same number of teeth as the sun gear 24 is integrally attached to one end, and the sun gear 2 fixed to an end of a fixed shaft 23 that penetrates the support shaft 14.
4 and the idler 22 are engaged.

Reference numeral 25 is a well-known Schmidt coupling mechanism composed of three discs 25a, 25b, 25c joined together via a link 26, and the first disc 25a is driven by an arm rotation drive motor 29. Drive shaft 27
In addition, the third disc 25c is coupled to the above-mentioned input shaft 15 respectively, and the third disc 25c is driven without causing a deviation of the rotation angle or a fluctuation of the transmission torque irrespective of the deviation of the axial center between them. The rotation of the shaft 27 is transmitted to the input shaft 15, and the pair of swivel arms 11, 11 are rotated inwardly by the gears 28, 28 at the ends of the drive shaft 27 that mesh with each other.

On the other hand, the above-mentioned pair of revolving arms 11, 1
The movable frame 30 which holds the base end portions of the swivel arm 1 is provided with the connecting plates 33 and 34 fixed to the front end and the rear end, respectively.
1 is formed in a frame shape surrounding the movable frame 30.
Are mounted so that they can slide up and down while being guided by four guide rods 36 ... Standing on the machine frame.

By the way, reference numeral 40 in the drawing is a drive motor for moving the movable frame 30 up and down in order to draw a required elliptical locus on the horizontal seal jaws 20, and this drive motor 40 is rotated in a rotating direction at a predetermined timing. An AC servomotor capable of switching between is used.

Then, as shown in FIG. 4, every time the horizontal sealing jaws 20, 20 reach the vicinity of the joining position and the maximum separating position, the drive motor 40 controlled by the braking circuit to be described later is rotated normally and reversely. Then, the revolving arms 11, 11 are vertically driven with a set amount of stroke via the brat 37 on the movable frame 30 that is screwed with the screw rod 41 on the drive shaft.

FIG. 3 shows a circuit for controlling the arm turning drive motor 29 and the arm lifting drive motor 40. FIG. 4 shows the movement of the turning arm 11.
The related operations of the arm turning drive motor 29 and the arm lifting drive motor 40 are shown.

Reference numeral 51 is an arm rotation angle detecting means for detecting the rotation angle of the revolving arm 11 from a certain reference point I based on the rotation of the arm revolving drive motor 29, and is proportional to the rotation angle of the revolving arm 11. The detected pulse signal is the detection means 5
It is input to the control means 53 from the pulse transmitter 52 connected to 1. 54 is a packaging material designating means such as a keyboard for designating the material and width of the packaging material S. When the packaging material width is designated,
The program storage means 55 connected here outputs one program signal designated from each program to the control circuit 53 to execute it.

On the other hand, the control means 53 is a pulse oscillator 52.
When the pulse signal from the motor and the signal from the packaging material designating means are inputted, the control signal is changed so that the angular velocity of the swing arm 11 is changed in the region of the lateral sealing stroke.
6 to control the rotation of the arm swiveling drive motor 29, and output a control signal to the motor driving means 57 every time the swivel arm 11 reaches the lateral seal position and the opposite side position to drive the arm elevating and lowering drive. The switching timing of the motor 40 is controlled to rotate the motor 40 by an amount corresponding to a designated stroke amount.

Next, the operation of the apparatus thus constructed will be described. First, the packaging material designating unit 54 designates the material and film thickness of the packaging material S to be used, the width of the packaging material S, or the like.

As a result, the arm lifting drive motor 40
Is the swivel arm 11 according to a preset program.
From the predetermined reference point I to the horizontal seal stroke start point II
The forward rotation is started at the time of rotating to, and the movable frame 30 is lowered in the same direction according to the transfer speed of the packaging material S by a stroke of an amount determined by the material of the packaging material S and the like.

Therefore, the lateral sealing jaws 20, 20 held at the tips of the swivel arms 11, 11 are in contact with the surface of the packaging material S over the stroke L depending on the width or material of the designated packaging material S. The traveling of the arm starts, and the arm rotation drive motor 29 increases or decreases the rotation speed according to the torque that fluctuates with the movement of the arm rotation drive motor 29 to apply the required lateral seal to the packaging material S.

Then, at the end point II 'of the horizontal sealing process, the horizontal sealing jaws 20 and 20 which have undergone the required horizontal sealing process.
When the robot further turns and reaches a position IV which is the farthest after making a half turn, the arm lifting drive motor 40 starts rotating in the opposite direction according to the program, and the fulcrum positions of the turning arms 11 and 11 are set to the original positions. Return to.

In the above description, the lifting mechanism for the swing arm 11 is described as the lifting mechanism for the movable frame 30 by the screw rod 42 of the arm lifting drive motor 40. 30 strokes L
Other lifting mechanisms such as a rack and a pinion can be used as long as the mechanism can change.

If necessary in this mechanism, the arm rotation drive motor 29 is stopped while the arm elevation drive motor 40 is operating, and the entire sealing step II is performed.
It can also be controlled to eliminate relative movement between the transverse sealing jaws 20 and the packaging material S over ~ II '.

[0024]

As described above, according to the present invention, the swiveling means for swiveling the pair of lateral seal members inward is disposed below the means for forming the packaging material into a tubular shape, and
Elevating drive means for moving these lateral sealing means in the transport direction of the packaging material over a specified stroke is provided, so that even if the lateral sealing member is swung at high speed, an unreasonable force is applied to the packaging material. It is possible to perform a proper lateral sealing process on the packaging material with a stroke according to the material, the film thickness, the width, etc. of the packaging material without acting.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a bag making and packaging machine provided with a lateral sealing mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view of an arm turning mechanism in the same apparatus.

FIG. 3 is a diagram showing an example of an operation control circuit of the same apparatus.

FIG. 4 is a diagram showing operations and timings performed by the same device.

[Explanation of symbols]

 10 Lateral Seal Mechanism 11 Revolving Arm 20 Lateral Seal Jaw 25 Schmidt Coupling 30 Movable Frame 40 Arm Drive Motor

Claims (1)

[Claims] 1. A bag-making packaging machine of a type in which a tubular forming of a band-shaped packaging material and a lateral sealing treatment of the packaging material are continuously performed in parallel with a filling operation of the filling material. Below the cylindrical forming means, a pair of swiveling means for rotating inwardly the lateral seal member supported by the driving means by the driving means so as to sandwich the packaging material transfer path is disposed so as to face each other, and the lateral seal is provided. A lateral sealing mechanism in a bag making and packaging machine, characterized in that an elevating drive means for moving both of the swiveling means in the packaging material transfer direction over a set stroke when the member has swung to the sealing position is provided. ..