JPS6229366Y2 - - Google Patents

Description

[Detailed description of the invention] In a packaging device equipped with a device that grips both sides of a packaging bag with support members and conveys it by intermittent motion,
During the transportation path of the packaging bag, there are a pair of opening claws that are individually biased so as to expand to the full allowable angle of the figure eight shape, and when activated, the opening claws resist the bias to open the opening claws at a V-shaped angle. An opening claw device consisting of a control piece that closes the opening and a detection switch is attached to an arm that is movable up and down, and each opening claw has an operating arm that is operated by contacting the detection switch individually when the opening claw is opened to the full allowable angle. and an actuating arm interlocked with the actuation of the control piece, and the pair of opening claws are moved to V by the actuation of the control piece.
After it closes at the same angle as the arm and plunges into the packaging bag as the arm descends, the control piece is deactivated and each opening claw is brought into tension contact with the packaging bag at an expansion angle within the above-mentioned allowable angle to expand it. A bag mouth opening claw device for a packaging bag was developed in 1973, and consists of a configuration in which the switch is actuated by an operating arm when each opening claw opens to the full allowable angle due to the absence of a packaging bag. This is disclosed in Publication No.-24853.

However, in such a device, a pair of rocking pieces that are biased in the expansion direction are pivotally supported on the lower surface of the tip end of a horizontally extending arm, and a detection switch is attached to the upper surface of the arm. The operating arms of the switches extending upward are faced above the switches, and the opening claws are fixed to the lower ends of the swinging pieces and extended in the direction of intermittent rotation of the packaging device, respectively, and the opening claws are fixed to the protruding shafts extending in the direction of intermittent rotation of the packaging device. A hopper for filling the packaged material is lowered between the shaft and the opening claw that opens the packaging bag, and the detection switch or the operating arm of the switch is moved upward in the shape of a turret at the tip of the arm. The opening claw must be rotated together with the arm from the opening station to the filling station so that the filling hopper of the packaged material faces the bag mouth, and then the arm is raised and returned to the opening station at the same time. The complicated and frequent operation of closing the claw in a V-shape and inserting it into the opening of the packaging bag of the station must be controlled, so this complicated operation becomes unstable and may cause damage or malfunction of the detection switch, etc. There was a simple flaw. The present invention eliminates the above-mentioned drawbacks by moving the mounting position of the detection switch closer to the center of vertical movement of the arm and eliminating the extension of the operating arm of the switch.

An embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes an intermittent rotating shaft that rotates intermittently by 45° or 60° each time, and 8 or 6 supporting arm pairs 3 are provided on a disc 2 fixed to this shaft. The intermittent rotation of the intermittent rotating shaft 1 causes it to sequentially stop at a supply station, an opening station, a filling station, a melting station, a discharge station, etc., and at the supply station, the pair of supporting arms 3 grips both vertical edges of the packaging bag a and transports it. .

The opening station I is provided with movable suction cups 24, 24a corresponding to both sides of the packaging bag a and a pair of opening claws 12, 12a that close in a V shape or open in parallel. The opening claws 12, 12a are a pair of rocking pieces 7, which are pivotally supported by inner and outer shaft elements 6, 6a at the tip of a horizontal arm 5 fixed to a lifting shaft 4 loosely inserted into the center of the intermittent rotating shaft 1. As shown in FIG. 2, each of the swinging pieces 7, 7a is fixed to a mounting plate 8, 8a which protrudes in the conveying direction of the packaging bag a, as shown in FIG. A tension spring 10 is applied between 9 and 9a to apply a force for expansion to the full allowable angle as shown in FIG. 11 and 11a are provided. Further, as shown in detail in FIG. 2, a second bell crank 13 is fitted into the shaft 6 adjacent to the swinging piece 7, and the horizontal piece 13a projects from the lower surface of the intersection of the expansion control arms 11, 11a. The pressure receiving pin 14 is inserted into the upper part 13b, and the second rod 15 is inserted into the upper part 13b.
Concatenate. Reference numeral 18 denotes a shaft 17 of a shaft support piece 16 attached to the upper surface of the arm 5 near the connecting portion to the lifting shaft 4.
A first rod 19 that is pivotally supported by a first bell crank and that has one end 18b of the bell crank 18 inserted loosely into the center of the lifting shaft 4 and protrudes above the arm 5.
The other end 18a of the first bell crank 18 is connected to the connecting shaft 20 provided in the second rod 1.
5 to the left end in Figure 1.

The reason why the one end 18b of the first bell crank 18 is connected to the first rod 19 as described above is because the lowering control of the first rod 19 causes the first bell crank 18 to connect to the first rod 19.
1 in the clockwise direction in Figure 1, thereby rotating the 2nd
The rod 15 is moved to the left, the second bell crank 13 is rotated, and the opening claw 12 is opened by the pressure receiving pin 14.
12a in a V-shape as shown in FIG. 1. When the second rod 15 moves to the right with the lowering control of the first rod 19 released, the first bell crank 18 closes the first rod 19. It rotates independently in a counterclockwise direction in relation to the The amount of rotation is up to the full allowable angle of the opening claws 12, 12a due to the contraction of the spring 10.

When the first bell crank 18 rotates clockwise due to the lowering control of the first rod 19, an arc movement occurs, but the first rod 19 provided with the connecting shaft 20 is not tightly inserted into the lifting shaft 4, but is loosely inserted. Therefore, the arcuate movement can be absorbed by bending the rod 19 or by slightly loosely engaging the end 18b of the first bell crank 18 with the shaft 20.

Reference numeral 22 denotes a detection switch attached to a bracket 21 fixed on the arm 5 in the range of rotational movement about the axis 17 of the first bell crank 18, and the opening claws 12, 12a detect the permissible angle as shown in FIG. When the first bell crank 18 is fully expanded, the one end 18b of the first bell crank 18 further rotates counterclockwise as shown by the arrow X from the angle indicated by the chain line in FIG.
Press the contact control lever 23 to switch the switch 22
Activate.

In the embodiment described above, the lifting shaft 4 is slightly raised;
The lower ends of the opening claws 12, 12a of the swinging pieces 7, 7a, which are pivotally supported by the arm 5, are raised to approximately the line 25, and at the same time, the raising of the first rod 19 is controlled to
The bell crank 18 is set at the angle shown by the solid line in FIG.
The pressure receiving pin 14 is moved upward by the second bell crank 13 through the rod 15 at the angle shown by the solid line in the figure, and the expansion control arms 11, 11a are pushed up by the pin 14.
The swinging pieces 7, 7a are swung against the elasticity of the spring 10 to bring the lower ends of the opening claws 12, 12a into contact with each other to create a V-shape.

In this position, when the packaging bag a suspended by the support arm pair 3 stops at the opening station 1, the movable suction cups 24, 24a approach both sides of the bag, and move further along the arrow line in FIG. At the same time, the lifting shaft 4 and the first rod 19 descend as shown in the solid line in Figure 1 to open the opening claws 12, 12a closed in a V shape. Insert it into the bag mouth b and simultaneously raise the first rod 19. For this reason, the first bell crank 18 is at the angle indicated by the chain line, and the second bell crank 18, which was being pulled by the second rod 15, is
The bell crank 13 is at the angle shown by the chain line, and the pressure receiving pin 1 is
4 is lowered, the swinging pieces 7, 7a and the opening claw 1
2 and 12a are opened by the elasticity of the spring 10. However, since the opening claws 12 and 12a open inside the mouth b of the packaging bag a whose vertical edges on both sides are gripped by the pair of support arms 3, it becomes impossible to open the bag to the full allowable angle shown in FIG. be restricted as follows. On the other hand, the lifting shaft 4 rotates at the same speed as the intermittent rotating shaft 1 to the filling station, and at that position, the hopper for filling the packaged material is lowered to the bag opening b opened by the opening claws 12, 12a, and the lifting shaft 4 rotates at the same speed as the intermittent rotating shaft 1. 4 rises and returns to the opening station 1 independently, and the opening claws 12, 12a are closed in a V shape by the lowering control of the first rod 19, and a new packaging bag a is transported to the station 1.

The above is the movement when the packaging bag a is conveyed to the opening station 1 each time, but when the support arm pair 3 moves without grasping the packaging bag a, the opening claw 1
2 and 12a are not subject to the above-mentioned restrictions, and as shown in FIG. 3, the spring 10 causes the expansion to the full allowable angle, and the expansion control arms 11 and 11a push down the pressure receiving pin 14. Therefore, the second bell crank 1
3 rotates further than the angle indicated by the chain line in FIG. Pushing it up causes a switch operation to detect the absence of a packaging bag, that is, the idle movement of the opening claws 12, 12a.

In the present invention, with the above-described configuration, the detection switch 22 is mounted on the arm 5 near the upper end of the lifting shaft 4 in the rotational movement range of the first bell crank 18, so that the swinging pieces 7, 7a are There is no need to extend the detection switch operation arm upwards as in the past, and the detection switch is not fixed to the arm directly above the opening claw, so there is no need to cover the filling station with dust from the filling packaging, or the filling hopper. There is no risk of vibration due to the downward movement, and since the detection switch 22 is installed near the center of rotation of the packaging device, there is no risk of failure due to shocks at the end of frequent horizontal swings of the arm 5. Even if only one of the opening claws 12, 12a is expanded to the full allowable angle, the first
Since it is possible to accurately rotate the bell crank 18 to operate the detection switch 22, it has various effects such as simplifying the configuration for the detection operation of the switch.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a partial plan view, and Fig. 3 is a front view showing the opening claws 12, 12a expanded to the full allowable angle. It is. a...Packaging bag, 1...Opening station, 1...
...Intermittent rotation axis, 3...Support arm pair, 5...Arm,
6, 6a... shaft element, 7, 7a... rocking piece, 10...
...Spring, 11, 11a... Expansion control arm, 12, 1
2a... Opening claw, 13... Second bell crank, 1
5... Second rod, 16... Shaft support piece, 18... First bell crank, 19... First rod, 22...
Detection switch.

Claims (1)

[Scope of utility model registration request] The vertical edges on both sides of the packaging bag a are gripped by a pair of support arms 3 and conveyed by intermittent rotation, and during the conveyance path, the packaging bag a is urged to expand to the full allowable angle. A pair of opening claws 8, 8, whose expansion angle is limited by the packaging bag when inserted into the bag mouth b, are supported by an arm 5 fixed to the lifting shaft 4 at the center of intermittent rotation. 8,8
is pivotally supported on a shaft support piece 16 provided on the arm 5 near the immediate upper part of the lifting shaft 4, and one end of the shaft is connected to the lifting shaft 4.
In the packaging device, the first bell crank 18 is connected to a first rod 19 passing through the center of the packaging apparatus, and the second rod 15 is connected to the other end of the first bell crank 18. Attach the detection switch 22 to the arm 5,
The switch 22 is opened by the first bell crank 18 which is linked to the expansion movement of the opening claws 8, 8 to the full allowable angle.
1. A switch device for detecting idle movement of a bag mouth opening claw of a packaging bag in a packaging device, characterized in that the device is configured to press the bag mouth opening claw of a packaging bag.