JPS5918256B2 - Method and device for tying lid cutting threads of packaging containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for tying cutting threads for cutting the lids of packaging containers (hereinafter referred to as packs) for packaging eggs, food, fruits, etc.

The pack referred to in the present invention is a vacuum-formed thermoplastic film, such as a hard PVC film, in which a storage compartment and a lid are integrally connected symmetrically at the center. The edge of the folded lid and the edge of the storage area are sealed with spot heat sealing or non-adhesive tape.

For example, in a pack for eggs, as shown in FIGS. 1 and 2, recesses 5 are formed in the lid 2 in correspondence with the storage section 1 in which recesses 5 are formed to store a plurality of eggs in one or three rows. , the central connecting part is folded 15 along the folding line 3 and then wrapped.

In recent years, an incision thread Y is tied in tension around the central connecting part of a pack P for packaging eggs as shown in FIG. Packs in which a fold seal 4 is applied to the edges and the lid 2 is incised along a central joint fold line 3 opposite to the edge of the lid 2 are popular.

As mentioned above, when the incising thread is tied around the central connecting part of the pack, it is easy to take out fragile items such as chicken eggs, because there is no need to peel off the seal, so there is no need to worry about over-stripping and breaking the eggs. It can be taken out. Conventionally, the work of tying the incision threads around them was done manually, but since the incision threads had to be tied in a taut state, this work was not easy and inefficient, and the amount of consumption was large. The current situation is that demand and supply do not match.

The present invention provides a method and apparatus for automatically tying the incision thread for incising the lid of the pack to the central connecting part of the pack under tension.

The reason why the incision thread is tied under tension is that in a relaxed state, there is a risk that the incision thread may be caught during handling at the store or during transportation. 11. The main object of the present invention is to effectively bind the incision threads by utilizing the elasticity of the pack in a state where the pack is deformed into a curved state, and by tensioning the surroundingly tied incision threads when the pack is restored to its curved state. The present invention provides a method for tying incision threads, and also provides a tying device for incision threads that is suitable for efficiently tying incision threads around each other with a tying effect that prevents mistakes in tying incision threads. be.

According to a feature of the present invention, the method of the present invention first bends both ends of the pack whose central connecting portion is moved parallel to the traveling direction in an upwardly opened state to bend the pack downward, and this deformation is avoided. On the other hand, as the pack is moved, an incision thread passing through the center upper part of the pack from the bobbin winder and connected to the knot 1 is fed out and surrounded by the central connection part of the pack, and the middle of the incision thread is guided to the knot 1 and tied. After performing this, the curved deformation is released and the material is discharged from the binding position.

Furthermore, the present invention provides a device for performing the binding method effectively and with high efficiency, in which an incision thread guiding member that guides the incision thread let out from a bobbin to a knotter is supported so as to be rotatable back and forth. A chain conveyor is provided which supports the binding part and a plurality of back cradle at equal intervals and operates intermittently.
When the packs supplied and placed on the pack holder move to the bundling part by the intermittent movement of the chain conveyor, the stopper 1, which the advancing side of the pack comes into contact with, is rotatably supported; The present invention is characterized in that the middle of the incision thread fed out from the bobbin and surrounded by the central connecting part of the pack is guided to the knotter by rotation of the incision thread guiding member.

The above-described method and apparatus of the present invention include the following steps when tying the incision thread for incising the lid around the central joint of the bag:
The elasticity of the pack is used to curve the pack downward as it moves, and this deformation is temporarily restrained.When the pack is restored by releasing the curved deformation, the bundled incision thread becomes taut. It is a binding that exhibits a state.

Next, referring to the attached drawings Figures 4 to 7, pack 5 chicken eggs in two rows for a total of 10 eggs (see Figures 1 and 2).
An embodiment of a device for binding incision threads Y to chicken egg packs P will be described.

Reference numeral 10 denotes a pair of chain conveyors (only one side is shown) that is stretched between four chain wheels 11 on each side, and the chain conveyors are driven by a known clutch mechanism or the like from an appropriate drive source (not shown). It is constructed so that it moves intermittently in the direction of the arrow through an intermittent drive device (not shown).

Reference numeral 12 denotes a large number of pack holders supported at equal intervals on the chain conveyor.

The pack holder moves and circulates in the order of bag supply position 1, cutting thread binding position, and discharge position by the intermittent operation of the chain conveyor 10. The opposite bottom of the advancing side of one pack P supplied from a pack P (not shown) is placed thereon. The packs P supplied to the bag pedestal and removed from the pedestal are received by a bed plate (not shown) installed between the chain conveyors 10. Reference numeral 13 denotes a cutting thread guiding member which is provided in a reciprocating manner in the binding position, and is formed in a fan shape and is connected to a rotating shaft 14 through a one-rotation crack mechanism (not shown) from an appropriate drive source (not shown). They are connected by a crank mechanism 15 and reciprocate once for each revolution of the shaft 14.

Reference numeral 16 designates a stopper 1, which is supported by a rotary solenoid 17 and rotates instantaneously when the rotary solenoid is turned off, and the pack holder 12 moves from the pack supply position 1 to the incision thread binding position. It is provided at a position where the moving side edge of the pack P on the pedestal comes into contact when the pack P is moved.

Reference numeral 18 designates a knotter provided at a lower bundling position of the chain conveyor 10.

(Since the knot 1 is a known one, the explanation of its construction will be omitted.) The cutting thread Y is pulled out from the bobbin winding, passes through the tension device 19, passes through the guide 20 provided in the fan-shaped part of the cutting thread guiding member 13, and then is inserted into the knot. The thread passes through one 18 thread knots 18a and is connected to and held by the clip part 18b. Next, a description will be given of the incision thread binding effect of the device having the above-described configuration. When the packs P, which have been fed to the pack holder 12 at the supply position 1 with the center connecting part facing upward and open in the direction of travel, are moved to the bundling position by the intermittent operation of the chain conveyor 10, the packs are held in the stopper 16 which is held in a hanging state. When the moving side edge of the pack P comes into contact with the pack P, the moving side edge bends downward and the opposite edge also forms an acute angle as shown in FIG. 5. , and is thus self-elastically deformed into a curved state.

On the other hand, the cutting thread Y, which is pulled out from the bobbin by the movement of the bag P, passes through the thread knotting part 18a of the knotter 18, and is held in the clip part 18b is let out from the bobbin as shown in FIG. 5 from the state shown in FIG. 116, and a knot 18 is reached along the bending line 3 of the central connecting portion of the pack P. In this state, the shaft 14 is continuously driven one rotation. First, the incision thread guide member 13 is rotated counterclockwise by half a rotation of the shaft 14, so that the middle of the incision thread Y is bent into a curved state as shown in FIG. The pack P is guided to the knotter 18 along the bending line 3 of the central connection part, and then the knotter 18 is activated to bind the cutting thread Y, and at the same time, the shaft 14 is turned half a turn as shown in FIG. In this manner, the incision thread guide member 13 is returned to its original position in the clockwise direction, and the stopper 16 is turned counterclockwise instantaneously by energization from the hanging state to the rotary solenoid 17. Due to this rotation, the pack P, which had been deformed into a curved shape, is released from its restrained state and returns to its original supplied state due to the restoring force due to its self-elasticity. In this way, the incision thread Y, which is wrapped around the connecting central bend line 3 of the pack P, becomes in a taut state, and the pack P with the incision thread Y is moved to the discharge position of the chain conveyor 10 intermittently as shown in FIG. Move by train. Then, the stopper 16 is returned to the state shown in FIG. 5 again, and the above-described series of operations is repeated to bind the incised threads to the packs P that have been sequentially moved to the binding position. When carrying out the above-mentioned apparatus and tying incision threads into packs, there is a supply device that supplies the pack P onto the pedestal 12 at supply position 1, a discharge processing device for discharging the bundle of incision threads moved to the discharge position, etc. For example, a supply device stores a large number of packs stacked above the supply position, and suctions air that acts on the suction member sequentially starting from the lowest pack.
When the pack is cut off, the bottom of the pack is suctioned by suction and taken out onto the pack holder, or a peeling member that engages and rotates at both edges in the length direction of the pack is installed to peel off and take out the pack. It is best to use a device that has a built-in system, and the discharge processing device can be equipped with a lifting member below the discharge position to push up and stack the bottoms of the packs one after another, or a belt conveyor connected to the discharge position can be installed to transport the packs to the appropriate position. It is also free to collect them, and both devices may be selected as appropriate.

By the above-described method and apparatus of the present invention, the incision thread for opening the lid of a pack made of hard PVC film, etc., which is popular for packaging eggs, food, fruits, etc., is tied around the central joint of the pack. When performing this, the self-elasticity of the pack is used to maintain the curved deformation, and the binding thread that was tied around the center joint of the pack recovers when the restraint of the curved deformation is released, and the binding thread is in a taut state. Since it is not loosened, the incision thread does not get caught during handling, and the use of the device of the present invention allows the incision to be made in the sequentially supplied packs more efficiently than with conventional artificial bundling. It has the effect of making it possible to perform surrounding binding of threads.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the open state of the egg pack;
The figure is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is an enlarged cross-sectional view of an egg pack in which the incision threads of the lid are tied together, and Figure 4 is a schematic side view showing an example of an apparatus for carrying out the method of the present invention. , Figure 5, Figure 6
This figure and FIG. 7 are explanatory diagrams showing the binding effect of the incision thread. P...Pack, 10...Chain conveyor 12...Pack cradle, 13...
Incision thread guide member, 16... Stopper 18.
...Notsuta No.1.

Claims (1)

[Scope of Claims] 1. The pack is bent downward by bending both ends of the pack whose central connecting portion is moved parallel to the direction of travel in an upward open state, and this deformation is maintained; With this movement, the incision thread that passes through the upper center of the pack and connects to the knotter is paid out from the bobbin winder, and is surrounded by the central connecting part of the pack, and the middle of the incision thread is guided to the knotter to perform binding, and then the curved deformation is released. A method for tying lid cutting threads of packaging containers, characterized in that the threads are discharged from a tying position. 2. A chain conveyor is provided which supports an incision thread guiding member reciprocally rotatably supporting an incision thread guide member that guides the incision thread let out from a bobbin winding to a knotter, supports a plurality of pack holders at equal intervals, and operates intermittently; With the operation of the chain conveyor,
When the pack supplied and placed on the pack pedestal moves to the binding part, the advancing side of the pack rotatably supports the stopper that comes into contact with it, and as the pack moves, the central connecting part of the pack is moved from the bobbin winder. A device for binding lid incision thread for a packaging container, characterized in that the incision thread that has been fed out and surrounded is guided in the middle to the knotter by rotating the incision thread guiding member.