JPS6226331Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to an improvement of a packaging device using a thermoplastic plastic band.

``Prior art'' This type of device generally overlaps the packaging ends of the band vertically, inserts a heater between the overlapping parts, melts the upper and lower ends, and then presses and joins the two. The parts can be cut from the band and the next packing operation can be repeated. In this case, conventional equipment has two methods: a method in which the overlapping part is cut before melting (Japanese Patent Application No. 74654/1982), and a method in which the overlapping part is cut off after melting and welding (Japanese Patent Publication No. 54-34394). has been adopted.

``Problem that the invention attempts to solve'' However, in any of these cutting methods, the band is gripped and fixed at two places, the tip and the tightening side after going around, and no tension is applied to the band. The general rule was to cut it off. Also,
Usually, the band is cut by shearing action by a pair of shearing blades separate from the band gripping part and the pressing part. Therefore, a considerable amount of installation space is required for arranging two band gripping members, a pressure bonding member, a pair of shearing blades, and the like. Therefore, in cases where the clamping diameter is small or the overlapping weld is narrow, such as in the case of small cargo, it is not possible to arrange all of the necessary members within the installation space, making welding and cutting difficult.

This idea was made in view of the above circumstances,
The gist of this is that the band is gripped at one place at the tip of the band, the number of band gripping members on one side is eliminated, and a pressure avoidance part is formed in a part of the seal press, while a part of the cutting part is The blade part is integrally formed to reduce the number of parts and installation space, and it is possible to weld narrow overlapping parts in small packages, making it easier to assemble the device and making it more compact. Furthermore, by forming a gripping tongue portion that is not welded to the base of the welded portion of the band, the welded portion can be easily peeled off later.

"Means to Solve the Problems" In order to solve the above problems, the present invention takes the following measures.

The packaging device using a thermoplastic plastic band according to the present invention includes a seal press head that is movable up and down on the bottom surface of a slide table on which cargo to be packed is placed, and a seal press head that appears between the slide table and the seal press head. A freely movable heater, a gripper for fixing the tip of a band around which the load is wound on one side of the seal press head, and a band guide hole arranged so as to be movable up and down on the other side of the seal press head facing the gripper. A cutter anvil having a structure of the seal press head is formed with a press flat part on the upper end surface thereof, and a press avoidance part that slopes downward from the press flat part on the cutter anvil side. Further, a blade portion is formed at the end of the pressure avoidance portion to shear the band in cooperation with the cutter anvil.

"Embodiments" This invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a schematic side view showing a main part of the packaging device of this invention in cross section. In the figure, 1 is a table on which the cargo to be packed is placed.
A slit 1a is provided for guiding a band 2 made of thermoplastic packaging. Further, a band guide arch 3 that is vertically swingable is pivotally attached to the upper surface thereof. Further, a slide table 4 for guiding the tip of the band 2 is attached to the lower surface of the table 1, and a step portion 4a is provided on one side.
has. Below this slide table 4,
A seal press head 5 is provided which can be raised and lowered to move toward and away from the slide table 4. As shown in FIG. 2, this seal press head 5 has a press-contact flat part 5a that contacts the slide table 4, and a press-contact flat part 5a that is inclined downward on one side of the press-contact flat part 5a, that is, on the supply side of the band 2. It consists of a pressure avoidance part 5b and a receiving blade part that shears the band 2 in cooperation with a cutter anvil 6, which will be described later, in the pressure avoidance part 5b.

On the other hand, between the slide table 4 and the seal press head 5, a center guide 8 that cooperates with the slide table 4 to form a tip guide path 7 for the band 2, and a heater 9 are selectively provided. It is freely arranged.

Also, the band 2 is engaged with one side of the seal press head 5, that is, the stepped portion 4a of the band 2.
A gripper 10 is arranged to clamp the tip of the
On the opposite side of the gripper 10, a cutter anvil 6 having a band guide hole 6a is disposed so as to be movable up and down. In this case, an arcuate surface 6b for guiding the band 2 is formed on the upper surface of the cutter anvil 6, and a receiving blade is provided at the upper end of the band guide hole 6a on the seal press head side of the cutter anvil 6. A portion 6c is formed.

Incidentally, numeral 11 is a sensor which, when pressed by the tip of the band 2, instructs to stop feeding the band 2. Regarding the power transmission mechanism, as shown in FIGS. 3 to 5, the motor 12 rotates counterclockwise in response to an ON command. A speed reducer 15 is installed which rotates the camshaft 14 to the left at a low and constant speed using the rotational force of the V-belt 13. This reducer 15 includes a clutch pawl 16 for starting and stopping the camshaft 14.
is installed. Also connected to the pawl 16 is a solenoid 17 which actuates the clutch. This reducer 15 constitutes a differential reduction mechanism, and by braking either the camshaft 14 or the sprocket 18, the power input from the motor 12 through the V-belt 13 is reduced. The structure is such that high output and low speed are output to the other shaft that is not braked.

Various cams that selectively perform various operations are attached to the camshaft 14. Further, a roller 19 used for feeding the band is attached to a shaft 20 which is constantly rotating to the left when the motor 12 is rotating. A pulley 21 for transmitting input from the motor 12 is attached to the shaft 20, and a belt 13 is wound around the pulley 21.

On the other hand, a reducer 15 that rotates the camshaft 14 at a reduced speed
A sprocket 18 attached to one of the output shafts is connected to a sprocket 23 by a chain 22. A band tightening roller 25, which is rotated in the right direction by a speed reducer 15 and is used for tightening, is mounted on the shaft 24 to which the sprocket 23 is attached.

A pair of rotatable rollers 27 and 28 are attached to the swing piece 30 in correspondence with the other band feeding roller 26 and the band tightening roller 25, respectively. Furthermore, the swinging piece 30 is pivotably supported around the pin 29 as a fulcrum.
Therefore, when sending out the band, the solenoid 31
is activated to pull the swinging piece 30 via the link 32 and spring 33. The roller 27 of the swing piece 30 is pressed against the band feed roller 26. band 2
The band 2 is sandwiched between a band feed roller 26 and a roller 27, and the band 2 can be fed into the arch by the rotational force of the band feed roller 26.

On the other hand, if the band is to be pulled back and tightened, the swinging piece 30 may be swung in the opposite direction and the roller 28 may be tilted so as to press the band tightening roller 25 against the band tightening roller 25. To perform this operation, the link 35 is moved by the cam 34 attached to the camshaft 14, the head of the bolt 37 attached to the link 35 pushes the pin 38, and the force is transferred to the spring 39.
The roller 28 is pressed against the band tightening roller 25, and the pressing force is used to sandwich the band, and the band is tightened by the rotational force of the band tightening roller 25. pull back,
Tighten.

"Operation" Next, the operation of the packaging device of this invention will be explained with reference to the embodiments shown in FIGS. 1 to 13.

First, when the band guide arch 3 is pushed open and the baggage A is placed at a predetermined position, the baggage sensor 40 disposed at the proximal end of the arch 3 is activated and the band is fed. That is baggage sensor 40
A signal is sent to start driving the motor 12. Then, the band feed roller 26 and the band tension roller 25 start rotating, and the solenoid 3
1 is activated and the band feed roller 26 is moved to the roller 27.
is pressed, and the band held between the rollers 26 and 27 begins to be fed into the arch. Then, the band 2 is inserted into the band guide hole 6a of the cutter anvil 6.
, passes through the groove guide of the arch 3, goes around the package A on the table 1, passes through the lower end guide passage 7 of the slide table 4, and finally collides with the sensor 11 (see Figure 8). . This sensor 1
1, the solenoid 31 is de-energized and the feeding of the band 2 is stopped. At the same time, the solenoid 17 is activated, the clutch pawl 16 engages with the teeth of the sprocket 18, and the reducer 15 is activated.
Hold the sprocket 18 on one output side.
This causes the camshaft 14 to rotate approximately 60 degrees (FIG. 3). By rotating this camshaft 14 by 60 degrees, the gripper 10 grips the tip of the band.
rises and grips the band tip between it and the stepped portion 4a of the slide table 4 (FIG. 9). At the same time, the center guide 8 retreats to a position where it does not interfere with the tightening and bonding operations. When this state is reached, the tightening cam 34 pivotally attached to the camshaft 14 rotates, thereby pushing the link 35 and pin 38 via the spring 39. Then, the swinging piece 30 is pushed and swings, and the band tightening roller works to tighten the band (FIG. 10).
At this time, the camshaft 14 rotates once by 60 degrees and then stops. The reason why the camshaft 14 stops is because the pawl 16 that was holding the sprocket 18 is released when the solenoid 17 is de-energized. When this pawl 16 is released, the sprocket 18
rotates, and the camshaft 14 then stops (third
figure). A tightening force setting spring 42 that utilizes the inclined surface of the cam 41 is attached to the lever 43 on the camshaft 14.
brakes the rotation of the camshaft 14 (Fig. 7).
On the other hand, the rotational force of the opened sprocket 18 is transmitted to the band tightening roller 25 through the chain 22, and the band begins to tighten. The band 2, which is gripped at one end, is pulled back against the packaged item A.
The band is gradually tightened, and the tightening force is applied as a load to the band tightening roller 25. When this load (tightening force) exceeds the force braking the camshaft 14, the camshaft 14 begins to rotate due to the action of the differential speed reduction mechanism, and on the contrary, the band tightening roller 25 stops. However, at this time, the tightened band does not loosen, and the camshaft 14 always acts as a reaction force to the tightened force.
rotates. When the camshaft 14 rotates, the solenoid 17 is energized again, and the sprocket 18 engages the pawl 1.
6. The camshaft 14 started rotating again without loosening the tightened band.
As a result, another cam attached to this rotates, and by its action, the heater 9 is inserted into the overlapping part of the band 2 formed between the slide table 4 and the seal press head 5. Then, the seal press head 5 is raised to sandwich the band between it and the slide table 4, and the heat from the heater melts the polymerized inner skin of the band (FIG. 11). After that, the seal press head 5 is lowered slightly to remove the pinching force and move the heater 9 away from the band overlapping area, and then the seal press head 5 is raised again and the band 2 is moved between it and the slide table 4. Strong pressure is applied and uniform pressure is applied to the molten surface of the band to enhance the welding effect and to cool and harden the molten band (FIG. 12). Next, continue to tighten the cutter anvil 6 without loosening the tightened band.
is pushed down by the cam. At this time, the blade part 6c of the cutter anvil 6 and the seal press head 5
The band 2 is cut in cooperation with a blade portion 5c formed at one end of the band 2 (FIG. 13). Then, at the same time as the cutting is completed, the force that was holding the band between the tightening rollers 25 and rollers 28 is removed. When the cutting is completed, the seal press head 5, cutter anvil 6, and gripper 10 return to their original positions, and the slide table 4 retreats from the band path to tighten the band 2 firmly. Become. Further, the slide table 4 and the center guide 8 return to their original positions, the solenoid 17 is de-energized, the pawl is removed, and the camshaft stops. The motor also stops in the same way.

Finally, the packaged package A is pulled back from the table 1 in the opposite direction to the direction in which it was initially inserted, completing the entire packing operation and entering a standby state to enable subsequent packing operations.

``Effects'' As mentioned above, the present invention includes a seal press head 5 that is movable up and down on the bottom surface of the slide table 1 on which cargo to be packed is placed, and a seal press head 5 that can be moved up and down between the slide table 1 and the seal press head 5. A heater 9 that can be freely retracted between the grippers 10 and 10, a gripper 10 that fixes the tip of the band 2 around which the cargo is wound on one side of the seal press head 5, and the seal press head 5 that faces the gripper 10.
The seal press head 6 has a cutter anvil 6 having a band guide hole 6a which is arranged to be movable up and down on the other side. 5
A pressure avoidance part 5b is formed on the cutter anvil 6 side that slopes downward from a, and the cutter anvil 6 forms a band guiding circular arc surface 6b on its upper surface, and the band on the seal press head 5 side. A blade receiving portion 6c is provided at the upper end of the guide hole 6a.
and forms a blade portion that shears the band 2 in cooperation with the downward movement of the end portion of the pressure avoidance portion 5b of the seal press head 6 and the receiving blade portion 6c of the cutter anvil 6. It is what it is.

Therefore, the gripper 10, which is one band gripper, and the tightening roller 25 fix the band under tension, and the welding and cutting processes can be performed while maintaining this fixed state. As a result, the number of band gripping parts on one side has been reduced, and even a narrow overlapping part can be reliably welded, making it possible to pack a small diameter part such as the case where the diameter part of a soft bag-like cargo A is fastened and packed.

Moreover, as mentioned above, the seal press head 5
Since the pressure avoiding part 5b is formed in the gripping tongue part 2 which is not welded at the overlapping part of the band 2,
However, by grasping and pulling the gripping tongue portion 2a, the welded portion can be peeled off and the packaged state can be easily unpacked (Fig. 15).

As mentioned above, according to the packaging device of this invention,
Since the band is gripped at only one place, the number of other band gripping members is eliminated, and the pressure avoiding part is formed in a part of the seal press, the receiving blade part which becomes part of the cutting part is integrally formed. It is possible to weld the narrow overlapping portion of the packaging band, reduce the number of structural members and simplify assembly, and furthermore, the entire device can be made compact. In addition, since a gripping tongue part that is not welded is formed at the overlapping part of the packed band, excellent effects such as being able to facilitate unpacking by holding this part are obtained, and its utility value is high. is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional side view showing the main parts of the packaging device according to the present invention, and FIG. 2 is a band gripping device of the device,
A schematic explanatory diagram showing the main parts of the welding and cutting operation mechanism, FIG. 3 is a schematic plan view showing the power transmission mechanism of the device,
Figure 4 is a vertical cross-sectional view showing the structure of the rocking piece and the roller that switches between band feeding and band tightening, Figure 5 is a cross-sectional explanatory view showing the main parts of the drive mechanism of this device, and Figure 6 is the state in which the band is being fed. FIG. 7 is an explanatory view showing a mechanism for setting the band tightening force, and FIGS. 8 to 13 are schematic side sectional views showing the operating state of this device. 14th
The figure is a perspective view showing an example of packed luggage.
FIG. 15 is an enlarged sectional view showing the overlapping portion of the packed band. 1...Table, 2...Band, 3...Band guide arch, 4...Slide table, 5...Seal press head, 6...Cutter anvil, 8
... Center guide, 9 ... Heater, 10 ... Gripper, 11 ... Sensor, 25 ... Band tightening roller, 26 ... Band feeding roller, 27,
28... Roller, 30... Rocking piece, 31... Solenoid, 33... Spring, 35... Link,
38...Pin.

Claims (1)

[Scope of utility model registration request] Slide table 1 for placing items to be packed
a seal press head 5 which is disposed so as to be movable up and down on the lower surface of the table; a heater 9 which can freely appear and retract between the slide table 1 and the seal press head 5;
A gripper 10 for fixing the tip of the band 2 around which the cargo is wound on one side of the seal press head 5, and a band guide hole arranged to be movable up and down on the other side of the seal press head 5 facing the gripper 10. a cutter anvil 6 having a seal press head 5;
forms a press-contact flat part 5a on its upper end surface, and also forms a press-contact avoidance part 5b that slopes downward from the press-contact flat part 5a on the cutter anvil 6 side, and the cutter anvil 6 An arcuate surface 6b for guiding the band 2 is formed on the upper surface, and a receiving blade portion 6c is formed at the upper end of the band guide hole 6a on the side of the seal press head 5, and an end portion of the pressure avoidance portion 5b of the seal press head 5 is formed. A packaging device using a thermoplastic plastic band, which forms a blade portion that shears the band in cooperation with the lowering movement of the cutter anvil 6 and the receiving blade portion 6c.