JPH0369779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic bag filling device that suctions and supports both sides of the opening side of a bag to open it. This ensures that a bag made of resin film can be opened reliably.

(Technical Background) As a bag for packaging products such as powdered sugar or individual items such as confectionery into small quantities,
Bags made of synthetic resin films such as vinyl and polyethylene are often used, and are also used for liquid products.

These bags are made by forming a bottom part on a long cylindrical film that is tightly attached to the flat surface by welding, and then sequentially cutting the film to the required size (length). packaged in

That is, as shown in FIGS. 4 and 5,
A rotary table 2 that rotates intermittently and a bag supply device 11 are provided on a base 1, and around the rotary table 2 there are support suction units attached to ventilation arms 3a and 3b that move in opposite directions. Piece 4a,
A plurality of sets (8 sets in the illustrated embodiment) of bag support devices 5 are provided, each of which has a hollow passage inside the ventilation arm and the suction piece. It has air holes and is connected to a vacuum source (not shown) so that both sides of the open end of the bag body 6 can be suction-supported.

Surrounding this rotary table 2 and aligned with the stop position of the bag support device 5 on the base 1, a bag supply station 10, an opening station 20, a filling station 30, an opening shaping station 40,
A heat seal station 50 and an ejection station 60 are provided.

In addition, 21 is an actuator, 22 is a ladder piece,
31 is a hopper, 61 is a conveyor, and in addition to the above-mentioned stations, a preliminary sealing station (not shown) and an empty station 70 can be provided as necessary.

The bag feeding device 11 is also equipped with a suction plate 12 that suctions and holds the opening edge of the bag 6 cut by the cutter 14, and a holding suction piece 13 that suctions and holds the lower part of the bag. Holding the bag body 6 by suction, turn it half a turn in the direction of the arrow (Figure 4), move it from position A to position B in Figure 5, and move the bag body 6 as shown in Figure 6.
is inserted into the gap between the opposing support and adsorption pieces 4a and 4b of the bag support device 5.

In this way, the bag 6 supplied to the bag support device 5 by the suction plate 12 and the holding suction piece 13 is supported by the ventilation arms 3a and 3b moving in opposite directions as shown by arrow C. Both sides of the opening side end are suction-supported by the suction pieces 4a and 4b, and the suction plate 12
Then, the holding adsorption piece 13 is released from adsorption and sent to the opening station 20.

In the opening station 20, the supporting adsorption pieces 4a,
The ventilation arms 3a and 3b are moved in the opposite direction of the arrow C while the supporting suction pieces 4b are kept suctioning both sides of the bag body 6, and the support suction pieces 4a and 4b are separated and the bag body 6 is
to open. At this time, the straining piece 22 pushed out by the actuator 21 squeezes both ends of the opening edge of the bag body 6 inward to assist in opening.

(Prior Art) However, in the conventional bag supply station 10 of such an automatic bag filling apparatus, the cut bag body 6 is suctioned and held by the suction plate 12 and the holding suction piece 13, as shown in FIG. When the bag body support device 5 is inserted into the space between the support and suction pieces 4a and 4b facing each other in an upright state, it is clamped and supported by the support and suction pieces 4a and 4b while remaining in the upright state, and is moved to the next opening station. Sent to 20th. Therefore, the suction surface 12a of the suction plate 12 and the suction surfaces of the support suction pieces 4a, 4b are made to coincide with each other on the same plane.
For this reason, a gripper 9 is provided on the upper part of the support suction piece 4b so as to face the end surface 12a of the suction plate 12 on the same plane as the suction surface, so that the moving position of the support suction piece 4b is aligned with the end surface 12a of the suction plate.

(Problems to be Solved by the Invention) However, synthetic resin films such as polyethylene have strong adhesion at the overlapped portions, so even if an attempt is made to open and open the bag by adsorbing both sides of the bag, the adhesion force will be too strong. It is larger, and the bag body separates from the support suction piece, making it easy to open the bag incorrectly. Although the straining piece 22 provided on the opening station 20 was designed to squeeze both ends of the opening edge of the bag 6 from the outside to the inside, a sufficient effect could not be obtained due to slipping on the surface of the bag.

(Means for Solving the Problems) In view of the above points, the present invention is designed to prevent the opening edge of the bag 6 from opening by separating the support adsorption pieces 4a and 4b. Adsorption plate 12 on one side
While holding the bag by suction, bend the lower part of the suction holding part of the bag toward the suctioned side to release the other side surface that is not suctioned by the suction plate 12, and the bag 6 is moved to the next station. Even if it leaves the suction plate 12 and bends back, an air layer is created at the edge of the opening.

(Example) This will be described with reference to an example shown in FIGS. 1 to 3.

When the suction plate 12 provided on the bag supply device 11 rotates toward the rotary table 2 side (position B in FIG. 5), it attaches not only to the support suction piece 4a of the bag support device 5 but also to the support suction piece 4b. overlapped for a short time,
The suction support surface 4c of the support suction piece 4b in the suction state is deviated inward from the suction surface 12a of the suction plate 12.

Therefore, the cut bag body 6 is placed on the suction plate 12.
The holding adsorption piece 13 holds and rotates the holding adsorption piece 13, and as shown in FIGS. , 4b move in the direction of arrow C in FIG. As shown, it is bent at the upper end of the support adsorption piece 4b. However, since one side of the opening edge is suctioned and held by the suction plate 12, it is forcibly bent nearly at right angles at the bottom end of the suction plate, but the other side is not suctioned and is held by the suction plate 12 due to its elasticity. It separates, creating an opening g between it and the other side that remains adsorbed.

Therefore, even if the suction of the suction plate 12 is released, an air layer is formed at the edge of the opening, weakening the adhesion strength, and the supporting suction pieces 4a, 4b in the opening station 20
The opening is ensured by separation of the opening.

(Effects of the present invention) In the present invention, before opening the bag, one side of the opening edge of the bag is held by suction and the lower part thereof is bent toward the suctioned side. As a result of this bending, the other side of the opening edge opens elastically, and even if the bag is folded back, an air layer is created between both sides of the opening edge of the bag, making it easy to separate, and the support adsorption piece at the opening station separates. This ensures reliable opening, completely prevents opening errors, and prevents any hindrance to the next process, especially the work at the filling station, which eliminates wastage of packaged items due to filling errors and improves productivity. Effects such as this can be obtained.

In the above embodiment, the bag body 6 is bent as follows.
The end of the suction plate 12 in the bag supply station is overlapped with the support suction pieces 4a and 4b of the bag support device 5 with a short distance, and the suction support surface 4c of the bag support device 5 is placed inside the suction plate. Although the bending is performed by moving the support suction piece, a separate bending station may be provided, and the suction plate that has suctioned one side of the opening edge of the bag body may be moved. It is also possible to bend the bag body.

[Brief explanation of drawings]

Fig. 1 is an embodiment showing the main parts of the present invention. Fig. 2 is a side view showing the state when the bag is supplied, Fig. 2 is a cross-sectional perspective view thereof, and Fig. 3 is the state when the bag is suction-held. FIG. 4 is a partially enlarged sectional view showing the automatic bagging device implementing the present invention, and FIG.
FIG. 5 is a side view, with some parts omitted. 6th
The figure is a side view showing the state of FIG. 1 with a conventional configuration. 1 is a base, 2 is a rotary table, 3a, 3b are ventilation arms, 4a, 4b are support adsorption pieces, 5 is a bag body support device, 6 is a bag body, 10 is a bag supply station,
11 is a bag feeding device, 12 is a suction plate, 13 is a holding suction piece, 20 is an opening station, 30 is a filling station, 40 is an opening station, 50 is a heat sealing station, and 60 is a discharge station.

Claims (1)

[Scope of Claims] 1. At least a bag supply station, an opening station, a filling station, and a discharge station are provided, each of which has a support suction piece that suction-supports both sides of the opening side end of the bag with the opening side facing up. In an automatic bag filling device that includes a bag support device that sequentially moves the station, and opens the bag by separating the support suction piece at an opening station,
A bag in an automatic bag filling device characterized in that, before the opening is performed, one side of the opening edge of the bag body is held by suction and the lower part of this suction holding part is bent toward the suctioned side. Body opening device. 2. The bag supply station includes a bag supply device having a suction plate that sucks and holds one side of the opening edge of the bag and inserts and supplies the bag between the support and suction pieces of the bag support device, and Claim 1: The suction end of the suction plate overlaps the upper part of the support suction piece for a short distance, and the suction support surface of the support suction piece is deviated inward from the suction surface of the suction plate end. A bag opening device in the automatic bag filling device described above.