JP3113427U - Bag opening device - Google Patents

Abstract

An opening efficiency of a sachet provided with a zipper at a bag mouth is achieved.
A pipe heater type heater 55 is installed inside a holding claw 31 for carrying a bag 11 in a bag hanging clamp 40 in a bag filling and packaging machine. Since the holding claw 31 receives the zipper 60 part of the wrapping bag 11 from outside and transfers it to the suspension clamper 40, the zipper 60 can be heated during the transportation process, and the transfer to the suspension clamper is performed. Immediately thereafter, the zipper 55 can be torn efficiently and with a relatively weak force.
[Selection] Figure 1

Description

  The present invention relates to an apparatus for facilitating opening by heating and softening a zipper formed in a bag opening.

  There is a wrapping bag in which a zipper is provided along the opening edge of a plastic packaging bag. The zipper can close the bag mouth by pushing the elongated male element into the elongated groove-type female element, and these two elements can be opened with a forced force from outside to open the bag. it can. Such opening of the wrapping bag can be performed by adsorbing the bag mouth with a pair of suction cups and tearing it to both sides, or by holding the opening edge with a pair of clamping claws. However, especially at low temperatures in the winter, the plastic zipper is hardened, so that the suction cup may be difficult to open, and the pinch nails have the disadvantage of damaging the bag mouth with a force.

  As means for solving such a problem, in Patent Document 1 below, a bag mouth is separated on both sides by a pair of opening devices, while the zipper is heated with hot air blown from a nozzle inserted into the bag mouth, Technical means for tearing the zipper with the opening device are disclosed. However, such an opening means has a problem in efficiency when employed in a rotary packaging machine.

Japanese Patent Laid-Open No. 10-081313 JP 59-103815 A

  In order to solve the above problem, the present invention provides a delivery mechanism for taking out a bag waiting on a transport conveyor and holding the bag with a clamping claw and transporting the bag to a pair of suspension clamps of a rotary bagging and packaging machine. A heater is installed inside the holding claw, and the zipper part provided in the bag mouth of the wrapping bag is held from the outside by the holding claw so that the zipper is not heated and the wrapping bag is delivered to the suspension clamp. To do.

  According to the above-described configuration, when each sachet sandwiched by the clamping claws is sequentially transported to the pair of suspension clamps of the rotary bag filling and packaging machine, the heater provided in the clamping claws holds the zipper of the bag mouth from the outside. Since the wrapping bag is conveyed to the suspension clamp while heating, the suspension clamp of the bagging and packaging machine receives the wrapping bag, and at the same time, the pair of opening devices can tear open the already softened zipper. Therefore, the intermittent stop time of the rotary bag filling and packaging machine that rotates intermittently can be shortened to improve efficiency.

  In FIG. 2, the transport conveyor 10 conveys a large number of wrapping bags 11 in a domino-tilted manner on the upper surface of the transport conveyor 10, and with the vacuum cup 22 supported at the tip of the tacky arm 21 of the take-out mechanism, Each holding bag 11 is sucked and taken out at a constant time interval, and a holding claw 31 provided in the delivery mechanism 30 is operated by a rotary arm 32 to move the packing bag 11 from the vacuum cup 22 to a rotary bag filling and packaging machine. To the suspension clamp 40.

  As shown in FIG. 4, the hooked arm 21 has a structure in which the vacuum cup 22 is rotated forward and backward by an arrow track 23 by the rotational power of the shaft 25 and the packing bag 11 is taken out at a predetermined time interval. The rotary wrapping machine mentioned in FIG. 2 is provided with a large number of pairs of suspension clamps 40 in a radial pattern around a circular rotor (not shown), and the rotor includes a plurality of suspension clamps. The structure is such that it rotates intermittently at a pitch that matches the installation interval, and the delivery mechanism 30 supplies the wrapping bag 11 to the suspension clamp 40 in accordance with the stop time of this intermittent rotation.

  FIG. 3 is a plan view of the transport conveyor 10 in which a plurality of string belts 12 arranged in parallel convey each dosing-wrapped bag toward the stopper 14 between the guide walls 13 on both sides. In this case, each bag is in an arrangement relationship in which the bag bottom is carried toward the stopper 14 and the bag mouth stops at the lower region of the pair of vacuum cups 22.

  In the figure, the pair of vacuum cups 22 attached to the flange 25 is supported via a lever 28 at the tip of a shaft 27 that is rotatably supported by a machine base 26 and the flange 25, and is input from the chain wheel 29 to the shaft 27. 4, the vacuum cup 22 rotates as indicated by an arrow 23 as shown in FIG. 4, and the bag mouth of the wrapping bag 11 adsorbed by the vacuum cup 22 is carried toward the standby position of the holding claw 31 as indicated by an arrow 24. It is.

  In FIG. 2, the lever 34 pivotally supported on the first pin 33 fixed to the machine base pivotally supports the rotary arm 32 integrally with the sub gear 36 on the second pin 35 at the upper end thereof. A chain 38 provided between the main gear 37 fixed to the sub-gear 36 and the sub gear 36 is tensioned by a tension gear 39. Accordingly, when the main lever 34 is swung by the vertical movement of the piston rod 46 in the fluid cylinder 45, the chain 38 that engages the stationary main gear 37 rotates the sub gear 36, and the rotating arm 32 that is integral with the sub gear 36. To reverse. As a result, a difference occurs in the posture angle of the rotating arm 32 when the rotating arm 32 reaches the upper region A of the conveyor 10 and when it reaches the upper region B of the suspension clamp 40.

  As shown in FIG. 4, the rotary arm 32 includes a fixed claw 51 and a rotary claw 52, and the rotary claw 52 is operated by a fluid cylinder 53, and the wrapping bag 11 is moved by relative approach and separation between the two claws. In this structure, the bag mouth is clamped or released. The movement of holding the bag in the area A in FIG. 2 and delivering it to the suspension lamp 40 in the area B is repeated.

As shown in FIG. 1, the clamping claw 31 has a pipe heater heater 55 installed inside a rotating claw 52, and the clamping claw 31 clamps the zipper 60 portion of the packaging bag 11 from the outside. Since it is received and transferred to the suspension clamper 40, the zipper 60 can be heated during this transporting process, and immediately after the transfer to the suspension clamper, it is adsorbed from both side surfaces of the bag 11 to the bag mouth as shown in FIG. With the vacuum suction cups 61 and 62, the zipper 55 can be efficiently and torn with a relatively weak force as shown in FIG.

  The clamping claws 31 in the bag delivery mechanism can be further improved in efficiency by providing a heater 55 on each of the pair of claws. In addition, instead of the pair of vacuum suction cups 61 and 62 shown in FIG. 5, a clamp-type opening device that directly tears the bag mouth 2 surface may be used.

Front view of the nail that delivers the wrapping bag to the suspension clamp Side view of the device Top view of the conveyor Side view of the bag removal mechanism Enlarged side sectional view of the bag mouth Opening view of sachets

Explanation of symbols

10 ... Conveyor 11 ... Packaging bag 22 ... Suction cup 30 for taking out the packaging bag ... Delivery mechanism 31 ... Claw 40 ... Suspension clamp 55 ... Heater

Claims (1)

In the delivery mechanism that takes out the wrapping bag waiting on the conveyor and holds the wrapping bag with the holding claws and conveys it to a pair of suspension clamps of the rotary bagging and packaging machine, a heater is installed inside the holding claw, A device for delivering the packaging bag to the suspension clamp without heating the zipper from the outside by clamping the zipper part provided in the bag mouth of the packaging bag from the outside.