JP3616508B2 - Packaging bag opening device - Google Patents

Description

[0001]
[Problems of the prior art]
When opening an opened envelope, everybody has experienced that opening is easy when breathing into the envelope. Similarly, in the packaging machinery field, a packaging bag is sent mechanically. Japanese Utility Model Laid-Open No. 57-188604 discloses a device that splits the mouth of each bag in advance and injects a small amount of air into the bag when the bag is opened one after another. The apparatus is configured as shown in FIG. 3, after sucking a pair of vacuum cups 2 fixed to two rotating bodies 1 on both sides of the bag 3, the cam 4 moves one end of the lever 5 downward, When the movement is transmitted through the link 6 and each of the rotating bodies 1 is rotated about the pin 7 as an axis, the lip of the bag 3 is divided into two by the vacuum cup 2 as shown in FIG. Since an air intrusion path is formed, the two rotating bodies 1 are then separated from each other, or the mouth of the bag 3 is grasped and separated by the two clamps 8, so that the bag 3 without mistakes as shown in FIG. Can be opened.
[0002]
However, the apparatus shown in FIG. 3 is not integrated with the movement of rotating the rotary body 1 around the pin 7 and the movement of moving the rotary body 1 or the clamp 8 away from each other. However, the structure of means for performing different movements must be equipped separately, and the structure is complicated in that respect.
[0003]
[Solution]
The present invention simultaneously and mouth split movement of FIG. 4, and to have integrity in the bag opening movement of FIG achieving efficiency up once, aims to simplify the structure of the apparatus, respectively upper A pair of open / close arms that move apart and approach each other with a support pin at one end as an axis, and a pair of swing arms that are swingably suspended from the open / close arms via pivot pins and a vacuum cup is fixed to the lower ends of the arms. It consists of a rotating link, and the rotating link is returned to its own weight balance direction by loosening of the pressing force of both vacuum cups in the process of separating the both opening and closing arms from the state where both vacuum cups are pressed from both sides of the bag, A double opening / closing arm that restricts rotation of the rotary link by an upper stopper after dividing the bag mouth adsorbed by the two vacuum cups by a return rotary motion transmitted from the rotary link to the vacuum cup. The continuation away motion, constituting as to widely open the bag.
In the above configuration, when the pair of open / close arms are separated from each other with the upper support pin as an axis, the pivot pins of the pair of rotary links are also separated from the open / close arm integrally with the vacuum cups attracting each other as a support point. The bag mouth is divided into two by the inclination of the vacuum cup caused by. And the continuous separation movement of the both opening and closing arms that restrict the rotation of the rotation link with the upper stopper further opens the bag, so that the bag splitting movement and the bag opening movement are integrated. .
[0004]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1A, a pair of vertically open / close arms 11 supported by the support pins 10 are interlocked by meshing of two gears 12 fixed to the support pins 10. The open / close arms 11 are separated from each other and approach each other. A pair of rotary links 14 that are suspended and pivotally supported via pivot pins 13 at the lower parts of the two open / close arms 11 respectively have vacuum cups 15 fixed to their lower ends, and these vacuum cups are clamped. Close to both sides of the bag 17 suspended and supported by 16, vacuum suction is performed on the bag. In this case, the rotary link 14 is pushed in by the lower stopper 18a of the mountain-shaped angle 18 fixed to the open / close arm, and the pressure-bonding force of the two vacuum cups 15 is increased.
[0005]
The crossing angle X between the center line 20 of the vacuum cup 15 and the center line of the rotary link 14 is 75 degrees. Therefore, when both the vacuum cups 15 are pressure-bonded to both surfaces of the bag 17, the rotary link 14 counters its own weight balance. Inevitably, there is a 15 degree tilt with the vertical plane of the bag. Therefore, as shown in FIG. 1B, when the opening / closing arm 11 is moved away by the rotation of the support pin 10 to loosen the pressure of the vacuum cup 15, the rotation link 14 inevitably maintains its own weight balance, that is, the center line 21 is vertical. Thus, the vacuum cup 15 is tilted by this return rotation, and the mouth of the bag 17 is split into two to form an air intrusion path. Further, the bag is greatly opened by the separation movement of the opening / closing arm 11. In this case, since the upper end of the rotation link 14 is subjected to rotation restriction by the upper stopper 18b of the angle 18, the vacuum cup 15 can strongly peel the bag mouth.
The opening / closing arm 30 shown in FIG. 2 has a lower end supported by a support pin 31 and a rotation link 32 supported by a pivot attachment pin 33 at the upper end, unlike the embodiment. In addition, in the drawing, each element indicated by the same reference numeral as in FIG. 1A and its action are the same as those of the same reference numeral in FIG. 1A.
[0007]
In FIG. 2, the coil spring 35 wound around the pivot pin 33 assists the returning rotational movement due to the weight of the rotating link 32. Therefore, it is possible to provide a similar spring in the case of FIG. 1A.
[Brief description of the drawings]
FIG. 1A is a side view, FIG. 1B is a partial side view of the previous figure, FIG. 2 is an explanatory view of another embodiment, FIG. 3 is a side view of a conventional example, and FIG. 5] Action diagram of conventional example [Explanation of symbols]
10 ... Support pin 11 ... Open / close arm 13 ... Pivoting pin 14 ... Rotating link 15 ... Vacuum cup 35 ... Spring

Claims (1)

Separating each of the support pins of the upper end to the shaft, and a pair of opening and closing arms for performing approaching movement, the hanging freely each swinging through the opening and closing arm lower the pivot pin and respectively facing the vacuum cup on the lower end A pair of rotating links fixed in a shape, and these links are restored by returning the both opening and closing arms from the state in which both vacuum cups are crimped from both sides of the bag in the process of separating the both rotating links in their own weight. The two vacuum cups installed in a slanted shape are opened from the upper side , the mouth of the bag adsorbed by the two vacuum cups is divided into two, and then the rotation link is restricted by an upper stopper provided in the both opening and closing arms, and the packaging bag opening device configuration for wide open the bag by continuing separating movement of the two closing arms.

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