JPH08156918A - Packaging bag support width adjustment device - Google Patents

Abstract

(57) [Summary] (Modified) [Object] The present invention is a packaging bag support width adjusting device provided in a bag filling and packaging machine, and relaxes restrictions on the installation position of the adjusting screw rod. [Structure] When the adjusting screw rod 40 is turned, the adjusting disc is rotated by the rocking of the rocking body 45. Due to the rotation of the adjusting disk, the projecting piece 27 is rotated according to the movement of the link 16 via the parallel link mechanism including the swing arm 28, the first link 29, the second link 30, and the projecting piece 27. By the rotation of the projecting piece 27, the one holding arm 24a is rotated and the other holding arm 24b is rotated in the opposite direction, so that the holding arm 24a is rotated.
The support width of a and 24b can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag support width adjusting device provided in a bag packaging machine.

[0002]

2. Description of the Related Art As a packaging bag support width adjusting device,
No. 5-6326, Japanese Utility Model No. 63-30652,
There is Japanese Patent Publication No. 4-51413. Mitsuko Sho 55-63
In Japanese Patent No. 26,26, an annular gear is provided concentrically with a swivel disc, a feed screw having a pinion engaged with the gear is provided, and the feed screw has a nut at the end of a swing arm connected to one holding arm. The feed screw is interlocked with the pinion by the rotation of the annular gear, the nut is fed by the rotation, and the swing arm is rotated to rotate one of the sandwiching arms, and the interlocking mechanism is used. By rotating the other holding arm in the opposite direction, the support width of the both holding arms can be adjusted. Japanese Examined Patent Publication No. 4-51413 is published in Japanese Utility Model Publication No. 55-63.
The device disclosed in Japanese Laid-Open Patent Publication No. 26 is an improvement over the drawback that the packaging machine must be stopped in order to adjust the support width of the sandwiching arm. It is possible to move in the radial direction by means of, and the support width of the holding arm is adjusted on the circumference of the movable cam via a cam contact roller which is pressed. In addition, Japanese Utility Model Publication No. 63-30652 is also an improvement of the invention disclosed in Japanese Utility Model Publication No. 55-6326, in which the support width can be adjusted without using a feed screw mechanism attached to each holding arm. The opening of the adjusting disc is adjusted by the link mechanism of the sandwiching arm via one feed screw mechanism, and the other sandwiching arm is rotated through the interlocking mechanism to support the width of both sandwiching arms. Is adjustable.

[0003]

A new structure is desired as compared with the support width adjusting device disclosed in each of the above-mentioned publications, and in particular, the feed screw mechanism disclosed in JP-B-63-30652 is disclosed. , It is necessary to attach the adjustment disc in the tangential direction, and the installation location is restricted. Therefore,
The present invention provides a packaging bag support width adjusting device that is not subject to such restrictions.

[0004]

A support width adjusting device for a packaging bag according to the present invention has a pair of vertically sandwiching arms pivotally supported by an arm shaft, and pulls the pair of adjacent sandwiching arms through an elastic body. It is possible to rotate in opposite directions via the connecting member,
An adjustment disc for adjusting the opening is rotatably mounted concentrically with the swivel disc, and a contact roller attached so as to project toward the other holding arm and contact a substantially circular cam plate concentric with the swivel disc is mounted. The moving arm is rotatably attached to the arm shaft of the sandwiching arm, and one of the sandwiching arms is rotatable by a projecting piece formed to project in a direction opposite to the sandwiching arm, and the swing end is swung at the projecting end of the projecting piece. The first link, which is substantially parallel to the arm, is axially coupled, and the free end of the first link and the swing arm are axially coupled by the second link, which is arranged substantially parallel to the projecting piece, and the shaft of the edge portion of the adjusting disk is coupled. A free end of a link, one end of which is connected to the child, is connected to a connecting shaft of the first link and the second link, and a swingable rocking body and an adjusting screw rod are provided on a swivel disc, and an end portion of the rocking body. On the adjustment disc, while supporting the other end of the adjustment disc on the adjustment disc. By rotation of the rod it is to swing the rocking body.

[0005]

Since the adjacent holding arms are pulled by the elastic body and can rotate in opposite directions via the connecting member, the rotation of one holding arm causes the other holding arm to rotate. At the same time, the rotating force of the sandwiching arm
It is blocked by a swing arm equipped with a contact roller that comes into contact with the cam plate via a link mechanism composed of the projecting piece, the first link and the second link. Therefore, by making the shape (radius) of the substantially circular cam plate that is concentric with the swivel disk different, when the swinging arm rotates through the contact roller that contacts the cam plate, the holding arm rotates and is connected. The other holding arm rotates in the opposite direction via the member. Therefore, the support width of the packaging bag can be widened according to the shape of the cam plate. The bag width can be adjusted by opening the bag mouth when the object to be packaged is put in while holding the packaging bag and tensioning the bag for sealing. On the other hand, when the adjusting screw rod is turned, the adjusting disc is rotated through the swing of the swing body. Due to the rotation of the adjusting disk, the protrusion is rotated in accordance with the movement of the link via the parallel link mechanism including the swing arm, the first link, the second link, and the protrusion. By the rotation of the projecting piece, one holding arm rotates and the other holding arm rotates in the opposite direction, so that the support width of the holding arm can be adjusted. This adjustment of the support width can correspond to the size of the packaging bag.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. 1 showing a partially cutaway plane of a packaging machine, FIG. 2 showing a partially enlarged view of FIG. 1, and showing a cross section of FIG.
This will be described with reference to FIG. 4 showing the development of parts. As shown in FIG. 1, this packaging machine sequentially performs each step of bag supply, opening, filling, sealing, seal cooling and discharging at predetermined time intervals. A sleeve 2 is fixed by fitting to an intermittent swivel shaft 1 provided vertically at the center of a base (not shown), and between the upper end surface of the sleeve 2 and a flange 5 fixed to the intermittent swivel shaft 1. The thrust bearing 4 is provided in the. The swivel disc 7 has an annular cut portion 6 formed on the peripheral edge of the upper surface of the flange 5, fitted into the cut portion 6, and fixed by passing a bolt 8 through a through hole 9 formed. Also, a small-diameter adjusting disc 10 for adjusting the opening degree.
Is fitted to the outer periphery of the flange 5 concentrically with the swivel disc 7, and a part of the inner periphery is engaged with the cut portion 11 of the flange 5, and the adjustment disc 10 has a small angle on the lower face of the swivel disc 7. It is rotatable, and is rotated by a handle 40a described later. The adjusting disk 10 is provided with a plurality of downwardly projecting projections 13 at equal angular intervals along a virtual circle 14 centered on the axis of the intermittent swivel shaft 1, and a shaft 15 is screwed onto the projecting projections 13. One end of the link 16 is fitted and mounted on the shaft. Further, a substantially circular cam plate 17 is fitted on the flange 2a of the sleeve 2 concentrically with the rotary disc 7 and fixed.

An arm shaft 21 is provided near the outer periphery of the rotating disk 7.
Are provided so as to project on the lower surface, and the arm shafts 21 are arranged at regular angular intervals to form a pair of two.
In FIG. 1, ten arm shafts 21 are provided,
The same number of the downward protrusions 13 as the arm shafts 21 are formed. Clamping arm shafts 22a, 2 protruding from the outer periphery of the swivel disc 7
2b vertically supports an arm shaft 21 and a nut 24
The clamping arms 24a and 24b are fixed via the
A number of a and 24b are arranged. In addition, the fixed claws 50a and the sandwiching claws 5 are provided at the tips of the sandwiching arms 24a and 24b.
0b is attached, the holding claw 50b always maintains the holding state via the elastic body 51, and when the holding claw 50b is opened, the operating lever 53 presses the operating body 53. Further, a tension spring 26 is attached between the holding arm shafts 22a and 22b to pull each other, and a link member 38 is used to link them so that the holding arm shafts 22a and 22b rotate in opposite directions. is there. The connecting member 38 may be a pair of fan-shaped gears.

A projecting piece 27 projecting in the opposite direction to the sandwiching arm 22a is fixed to the sandwiching arm shaft 22a, and a swinging arm 28 projecting in the direction of the adjacent arm shaft 21 at the lower part of the sandwiching arm shaft 22a. Is rotatably supported on the arm shaft 21. The swing arm 28 is attached to the shaft 31 at the projecting end of the projecting piece 27.
Pivotally supports the first link 29 protruding in a direction substantially parallel to
The protruding end of the first link 29 and the swing arm 28 are connected by both ends of the second link 30 which is substantially parallel to the protruding piece 27.
Connection shaft 32 that connects the first link 29 and the second link 30
Is connected to the free end of the link 16 described above. A contact roller 33 is pivotally supported on the protruding end of the swing arm 28,
The contact roller 33 is constantly moved by the elastic force of the tension spring 26 by a parallel link mechanism composed of the projecting piece 27, the first link 29, the second link 30, and the connecting shaft 32.
It contacts the peripheral surface of the cam plate 17.

The adjusting screw rod 40 is swingable via a spherical pair 41 attached to the swivel disc 7, and has a screw portion 42 formed therein. The adjusting screw rod 40 is rotated by the handle 40a and its rotation amount is stopped. Regulate with body 48. A shaft 43 is vertically provided on the adjusting disc 10, and the shaft 43 has a long hole 44 formed in the turning disc 7.
Projecting from. The dog-legged rocking body 45 is used for the rotating disc 7
It is swingably attached by an upright shaft 46. A rotatable nut 47 is attached to the end of the rocking body 45, and the nut 47 is screwed into the screw portion 42 of the adjusting screw rod, while the other end of the rocking body 45 is connected to the shaft 43. It is attached so that it can rotate.

Next, during the packaging work, the support width adjustment for loosening or tensioning the packaging bag is performed by a loosening process for loosening the packaging bag to accommodate the object to be wrapped, and a tension for heat-sealing the bag mouth. Taking the sealing process as an example, FIG.
This will be described with reference to (A) and (B). 5A shows a filling step, and FIG. 5B shows a sealing step. In both cases, the shaft 15 of the link 16 is fixed at the same position (angle β) as the adjusting disk 10, and the contact roller 33 is used. However, Fig. 5 (A)
Shows the state of contact with the cam plate 17 having the radius R2, and FIG. 7B shows the state of contact with the cam plate 17 having the radius R3. When the state of FIG. (A) changes to the state of FIG. (B), the loose bag mouth can be tensioned. That is, the contact roller 33 shown in FIG.
Due to the radius (R2 <R3) of the cam plate 17, the cam plate 17 contacts the cam plate 17 at the left position as compared with the state of FIG. As a result, the swing arm 28 rotates clockwise around the arm shaft 21 to interlock with the second link 30, and the link 16 connected to the connecting shaft 32 of the second link 30 moves around the shaft 15. Then, it swings to the left to displace the connecting shaft 32, and with it, the first
The shaft 31 is displaced via the link 29, the projecting piece 27 is swung in the clockwise direction to rotate the holding arm 24a in the same direction, and the holding arm shaft 22b (the holding arm 24
Rotate b) in the opposite direction to increase the opening degree of the holding arms 24a and 24b. Therefore, the holding arms 24a, 24 during driving
The adjustment of the opening of b (the adjustment of the support width) can be performed via the contact roller 33 by changing the radius (R) of the cam plate 17. In the bag feeding process, the radius of the cam plate 17 is set to R1 (<R so that the packing bag can be received in a tensioned state.
3) (see FIG. 1). After the filling process,
Until the sealing step, the cam plate 17 is formed in a wave shape having a radius (R2 + α), and the holding arms 24a,
24b alternately opens and closes slightly. By this action,
The object to be filled in the vicinity of the opening falls into the packaging bag due to vibration to prevent the sealing of the object to be filled.

Next, with reference to FIGS. 6A and 6B, the adjustment of the support width corresponding to the case where the size of the packaging bag is made different depending on the storage amount of the object to be encapsulated will be described. Note that this support width adjustment is performed independently of the contact roller 33,
In FIGS. 6A and 6B, the contact roller 33 is in pressure contact with the cam plate 17 having the same configuration (radius R1, R2, R3). The pair of holding arms 24a and 24b are pulled by each other by a tension spring 26, and rotate via the connecting member 38 in opposite directions at the same angle to widen or narrow the tips. The holding arm shaft 22a, which constantly receives a counterclockwise rotational force, is
8, the contact roller 33 and the cam plate 17 via a parallel link composed of the projecting piece 27, the first link 29, and the second link 30.
It is pressed against and the rotation is blocked.

In this state, when the handle 40a of the adjusting screw rod is operated, the oscillating body 45 oscillates via the nut 47 about the shaft 46 erected on the revolving disk 7, and the adjusting disk 10 is moved. While rotating from the state (angle α) of FIG. 6 (A) to the state (angle α ′) of FIG. 6B, the adjusting screw rod also swings through the spherical pair 41 to change from the angle γ to γ ′. Due to the rotation of the adjusting disc 10, the position of the shaft 15 at the peripheral portion of the adjusting disc 10 is rotated from the angle β to β ′. With the movement of the shaft 15, the connecting shaft 32 of the link 16 is rotated, the first link 29 is pulled by the connecting shaft 32, and the shaft 31 is pulled by the first link 29 so that the projecting piece 27 (sandwich arm). The shaft 22a) is rotated in the clockwise direction to rotate the holding arm 24a in the same direction, while the holding arm 24a is rotated via the connecting member 38.
With the interlocking of b, the tension spring 26 repels the elastic force of the tension spring 26 to rotate, thereby widening the interval between the tips of the holding arms 24a and 24b and adjusting the opening simultaneously. The counterclockwise rotational force of the protrusion 27 by the tension spring 26 does not change the axial distance between the shaft 15 of the link 16 on the adjustment disk 10 side and the connecting shaft 32. Oscillates at substantially the same angle as the projecting piece 27 and hardly changes the angle of the oscillating arm 28. Therefore, the contact roller 33 provided on the oscillating arm 28 is kept in pressure contact with the substantially circular cam plate 17. Be blocked.

As described above, the handle 40 of the adjusting screw rod is used.
The nut 4 that is screwed into the threaded portion 42 by turning a
By rotating the oscillating body 45 via 7 and rotating the adjusting disk 10, the support width of the sandwiching arms 24a and 24b can be adjusted all at once, and since it can be adjusted via screws, The position of attachment of the adjusting screw rod 40 to the adjusting disc 10 is not limited to the tangential direction, unlike the conventional case, while the adjusting screw rod 40 can be adjusted with high precision.

7A and 7B show the adjusting screw rod 40.
Another configuration of is shown. A rotating sphere 61 having a screw 61a formed on the inner cylinder is rotatably attached to the swivel disc 7 and screwed with a screw portion 42 of an adjusting screw rod 40, and a tip portion 60 of the adjusting screw rod 40 has a swinging body. It is rotatably joined to the end of 45.
A stopper 63 is provided on the screw portion 42 so as to project, and the rotation amount is regulated. Also in this example, by rotating the adjusting screw rod 40, the adjusting screw rod 40 swings on the rotating sphere 61,
The oscillating body 45 is oscillated to rotate the adjusting disc 10, and the support widths of the holding arms 24a and 24b are simultaneously adjusted in the same manner as shown in FIG. In this way, the adjusting screw rod 40 and the oscillating body 45 can be configured, and through the rotation of the adjusting screw rod 40,
It is possible to accurately adjust the support width of the sandwiching arms 24a and 24b.

[0015]

According to the present invention, by mounting a pair of upper and lower sandwiching arms on the arm shaft and arranging a large number of sandwiching arms, many steps are possible, and an adjusting circle is provided through an oscillating body. Since the plate is rotatable, the adjusting screw rod can be arranged in a direction other than the tangential direction of the adjusting disc, and the installation place can be selected.

[Brief description of drawings]

FIG. 1 is a diagram showing a partially cutaway plane of a packaging machine.

FIG. 2 is a diagram showing a partial enlargement of FIG.

FIG. 3 is a view showing a cross section.

FIG. 4 is a diagram showing component development.

FIG. 5 is a diagram for explaining the operation of adjusting the support width during operation of the gripping arms.

FIG. 6 is a diagram illustrating an operation of adjusting a support width of a packaging bag of a holding arm.

FIG. 7 is a view showing a mechanism using another adjusting screw rod.

[Explanation of symbols]

 1 Swivel Axis 7 Swivel Disc 10 Adjusting Disc 16 Link 17 Cam Plate 21 Arm Shafts 24a, 24b Clamping Arm 26 Elastic Body 27 Projecting Piece 28 Swing Arm 29 First Link 30 Second Link 33 Contact Roller 38 Coupling Member 40 Adjustment Screw rod 42 Screw portion 43 Shaft 45 Oscillator 47 Nut

Claims (1)

[Claims] 1. A plurality of sets of rotatable holding arms are pivotally supported on an arm shaft at a constant angular interval on the outer periphery of a turning disk fixed to a turning shaft, and a pair of adjacent holding arms forms a packaging bag. In a supporting packaging machine, a pair of the sandwiching arms is vertically supported on an arm shaft, and the pair of adjacent sandwiching arms is pulled through an elastic body and rotatable in opposite directions via a connecting member. An adjustment disc for adjusting the degree is rotatably mounted concentrically with the swivel disc, and a contact roller is attached which projects toward the other holding arm and contacts a substantially circular cam plate concentric with the swivel disc. The arm is rotatably attached to the arm shaft of the sandwiching arm, and one of the sandwiching arms is rotatable by a projecting piece formed to project in a direction opposite to the sandwiching arm, and the swing arm is attached to a projecting end of the projecting piece. The first link, which is almost parallel to the first link, is axially connected, and the free end of the first link and the swing arm Is connected by a second link arranged substantially parallel to the projecting piece, and the free end of the link, one end of which is connected to the shaft of the edge of the adjusting disk, is connected to the connecting shaft of the first link and the second link. Then, a swingable body and an adjusting screw rod are provided on the swivel disc.
While swinging the swing body by rotating the adjustment screw rod, the other end of the swing body is pivotally supported on a shaft vertically provided on the adjustment disc while the other end is attached to the swivel adjustment screw rod. Packing bag support width adjusting device characterized by.