JP4104619B2 - Bag sealing device - Google Patents

Description

  The present invention relates to a bag sealing device for sealing the mouth or bottom of a bag.

  Various bag sealing devices for sealing the mouth or bottom of the bag have been proposed. For example, as a conventional technique in Japanese Patent No. 3581875, the bag is held in a suspended state with the bag mouth facing up after filling the contents. A pair of front and rear endless carrier chains to be transported, a taping mechanism for taping the upper end of a bag transported by the carrier chain into a horse shape, and a taping mechanism disposed at, for example, the apparatus body position at the rear stage of the taping mechanism. What is formed is provided with a stitching mechanism that sews the upper end of the bag.

  Also, the opening end side of the heavy wrapping paper bag along the transfer belt, such as a chain belt, that holds and directly below the sewing portion of the heavy wrapping paper bag that has been sewn and closed by the bag mouth stitching machine. A heater group that heats the outer side of the kraft paper and thermally welds the innermost polyethylene bag, and a binder that feeds the reinforcing tape across the bag mouth opening end of the heavy wrapping paper bag that has passed through the heater group, A cutter that cuts the reinforcing tape drawn out toward the bag mouth opening end by the binder, and the reinforcing tape straddling the bag mouth opening end are heated, and the reinforcing tape is applied with the heat welding material applied to the inside. There is known a closing device for a heavy wrapping paper bag that performs heat welding in which a heater group that is heat-welded to a bag mouth opening end is disposed (for example, Patent Document 1).

  In addition, the top of the bag that is successively transferred along the straight path is sewn with a sewing thread, and the top of the bag that is sewn and closed by the suturing mechanism is connected to each other. A thread chain cutter that cuts the continuous thread chain, and is placed at the rear stage of the thread chain cutter. A bag sealing device having a taping mechanism for taping is well known.

Japanese Utility Model Publication No. 51-18873

  In the bag sealing device described above, taping is applied to the upper end of the bag sewn and closed by the stitching mechanism with over tape, but the tops of the bags are connected to each other in the step before taping. In order to cut the continuous thread chain 15 that is being cut by the thread chain cutter, the cut end of the thread chain (hereinafter referred to as the surplus portion 21) hangs down in front of the bag, and the taping is kept at the upper end of the bag in this state. If applied, the end of the yarn chain protrudes from the over tape 6. FIG. 4 is a diagram for explaining this state, and FIG. 4 (a) shows the position where the continuous thread chain 15 that connects the tops of the bags 1 to each other is cut by the thread chain cutter between the bags. FIG. 4B shows a state in which the surplus portion 21 of the thread chain after cutting hangs down in front of the bag 1, and FIG. 4C shows a state in which the surplus portion 21 of the thread chain hangs down in front of the bag. Each taped bag is shown. The bag taped with the end portion of the excess portion of the thread chain protruding (see FIG. 4C), the thread chain protruding from the over tape 6 (the excess portion 21) is caught for some reason and the bag mouth If it is torn unexpectedly, the contents will be scattered from the bag.

  In order to solve this problem, a pair of left and right brushes 16 are arranged at the rear stage of the thread chain cutter and at the front stage of the taping mechanism so as to rub against both side surfaces of the upper end of the stitched bag from the side. (See FIG. 5). According to this, when the bag that is sewn and closed by the stitching mechanism and the thread chain is cut by the thread chain cutter is transferred along the straight path, the front side surfaces of the upper end of the bag are paired with a pair of left and right brushes. The excess portion 21 of the yarn chain that hangs down in front of the bag is hooked on the brush at the base end. Then, as the bag is transferred, both side surfaces of the upper end of the bag continuously pass through the brush from the front to the back, so that the excess portion 21 of the thread chain is continuously hooked on the brush and is substantially omitted. The posture is lifted horizontally (actually in a direction slightly upward from the horizontal, but here for the sake of simplicity), and the posture of the excess part of the yarn chain is made substantially horizontal. By applying the taping to the upper end of the bag while holding it, the excess portion of the thread chain can be securely stored in the over tape, and the protrusion of the thread chain from the over tape can be eliminated. Reference numeral 20 denotes a sewing closing portion.

  The above-described conventional bag sealing device uses a brush to eliminate the drooping of the excess portion of the yarn chain, and the brush is rubbed against the bag being transferred one after another. Each time the brush hair comes off and adheres to the bag, or the bag is transferred one after another, the brush is rubbed, so there is a problem in durability.

  Therefore, the object of the present invention is to eliminate the drooping of the excess portion of the yarn chain without using a brush, and to change the posture of the excess portion of the yarn chain from the proximal end of the excess portion to the rear in the transfer direction. The bag sealing device can be sent to the taping mechanism while being held in a state of being lifted from the base end, and therefore, the problem of brush hair dropout and brush durability can be solved.

  According to a first aspect of the present invention, there is provided a bag sealing device including a sewing mechanism for sewing a top portion of a bag with a sewing thread along a bag transfer path that is successively transferred along a straight path, and a rear stage of the sewing mechanism. A thread chain cutter that cuts a continuous thread chain that connects the tops of the bags sewn closed by the suturing mechanism, and a bag sewn and closed by the suturing mechanism. A taper mechanism is provided in which an over-tape is placed on the upper end portion in an inverted U shape and taping is performed by heat-sealing, and in order to solve the above-described problem, in the subsequent stage of the yarn chain cutter, In addition, at the front stage of the taping mechanism, whether the tip of the excess portion of the thread chain from the front end of the sewn closed portion of the bag after being cut by the thread chain cutter is behind the front end of the sewn closed portion of the bag. It is characterized in that it has provided the air blowout means for blowing upwards.

  According to the bag sealing device of the first aspect, the leading end of the excess portion of the thread chain hanging from the front end of the sewn closed portion of the bag after being cut by the yarn chain cutter by the air blowing means is connected to the front end of the sewn closed portion of the bag. Since the drooping of the surplus part of the thread chain is eliminated, the surplus part of the thread chain is positioned behind the front end of the sewn closed part of the bag behind the front end of the surplus part. Can be sent to the taping mechanism while being held higher than the base end. Therefore, by not using a brush, it is possible to solve the problem of brush hair loss and brush durability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a bag sealing device according to an embodiment of the present invention. In FIG. 1, as disclosed in Japanese Utility Model Laid-Open No. 51-18873, the bag 1 has a bag mouth that is sandwiched by a chain belt 2 so that the bag transfer path along the straight path is successively moved in the transfer direction. Be transported. In addition, a conveyor 3 is provided which cooperates with the chain belt 2 to place and carry bags.

  A suturing mechanism 4 that sews the top of the bag with a sewing thread at the front of the bag transporting path along the bag transporting path, and a top of the bag 1 that is sewn and closed with the suturing mechanism 4 at the rear stage of the suturing mechanism 4 A thread chain cutter 5 for cutting continuous thread chains connected to each other is disposed, and an over tape is provided at the rear of the transfer path of the bag 1 with respect to the upper end of the bag 1 sewn by the stitching mechanism 4. A taping mechanism 7 is provided which covers 6 in an inverted U-shape and taps by heat fusion.

  The suturing mechanism 4 and the thread chain cutter 5 are conventionally known ones. Further, the taping mechanism 7 is also a conventionally known one. Among these, the over tape 6 is obtained by applying a heat welding material such as a thermoplastic resin, for example, polyethylene to the inner surface covering the bag mouth. Further, the binder 8 guides the over tape 6 to the bag mouth in the form of being folded in the longitudinal direction. The tape cutter 9 cuts the over tape 6 at an appropriate position to the length corresponding to the width of one bag. The heater 10 heats the over tape 6 cut by the tape cutter 9. The pressure roller 11 presses the over tape 6 and is thermally welded to the upper end portion of the bag. The heater 10 and the pressure roller 11 are installed in a pair on the left and right in the bag transfer path.

  As shown in FIGS. 2 to 3, the present invention provides the bag 1 after being cut by the thread chain cutter 5 at the rear stage of the thread chain cutter 5 and at the front stage of the taping mechanism 7 as shown in FIGS. An air nozzle 12 is provided as air blowing means for blowing the tip of the excess portion of the thread chain from the front end of the sewn closed portion toward the rear and upward from the front end of the sewn closed portion of the bag. As shown in FIG. 3, a pair of air nozzles 12 are installed on the bag transfer path.

  According to this, the bag 1, which is sewn and closed by the stitching mechanism 4 and the thread chain is cut by the thread chain cutter 5, has the bag mouth sandwiched between the chain belts 2, and the chain belt 2 and the conveyor 3 along the transfer path. When the bag arrives at a predetermined position before the binder 8 of the taping mechanism 7, the bag is sensed by, for example, a lever connected to a microswitch and blows out air from the air nozzle 12 and is cut by a thread chain cutter. The tip of the surplus portion of the thread chain that hangs down from the front end of the sewn closed portion is blown away from the front lower side of the bag 1 toward the rear and above the front end of the sewn closed portion of the bag. Accordingly, the drooping of the excessive portion of the thread chain is eliminated, and the posture of the excessive portion of the thread chain is in a state where the distal end of the excessive portion is lifted from the proximal end behind the front end of the sewn closed portion of the bag. The bag 1 is sent to the guide bar 8a of the binder 8 of the taping mechanism 7 while the tip of the surplus portion is held in a state of being lifted from the base end. Therefore, by not using a brush, it is possible to solve the problems of brush hair loss and brush durability. Then, the taping mechanism 7 applies the taping to the upper end portion of the bag while maintaining the posture of the excessive portion 21 of the yarn chain in a state in which the tip is lifted from the base end, whereby the excess portion 21 of the yarn chain is removed. It can be surely stored in the over tape 6 and the protrusion of the thread chain from the over tape can be eliminated.

1 is a side view schematically showing a bag sealing device according to an embodiment of the present invention. It is a principal part enlarged view of FIG. FIG. 3 is a plan view of FIG. 2. Shows the bag where the continuous thread chain of the bag is to be cut, the excess part of the thread chain after the cut hangs down in front of the bag, and the tape that has been taped while the excess part of the thread chain hangs down in front of the bag It is a figure. It is a figure which shows the apparatus structure which eliminates drooping of the excess part of the conventional thread chain.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag 2 Chain belt 3 Conveyor 4 Sewing mechanism 5 Yarn chain cutter 6 Over tape 7 Taping mechanism 8 Binder 8a Guide bar 9 Tape cutter 10 Heater 11 Crimp roller 12 Air nozzle 15 Yarn chain 16 Brush 20 Sewing closing part 21 Excess part

Claims (1)

A sewing mechanism that sews the top of the bag with a sewing thread along the transfer path of the bag that is successively transferred along the straight path, and a bag that is arranged at the rear stage of the sewing mechanism and is sewn and closed by the sewing mechanism. A thread chain cutter that cuts a continuous thread chain that connects the tops to each other, and an inverted U-shaped tape over the upper end of the bag that is placed behind the thread chain cutter and sewn closed by the stitching mechanism In a bag sealing device in which a taping mechanism that taps by shape and is heat-sealed is disposed,
At the rear stage of the thread chain cutter and at the front stage of the taping mechanism, the front end of the excess portion of the thread chain from the front end of the sewn closed part of the bag after being cut by the thread chain cutter is the front end of the sewn closed part of the bag. A bag sealing device comprising air blowing means for blowing away rearward and upward.

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