JP2543821B2 - Full web type automatic stretch wrapping machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-web type automatic stretch wrapping machine, and more specifically, a rotary table is used to rotate an article to be packaged, and a stretch film is wrapped around it to form a single layer. The present invention relates to an improvement of a full-web type automatic stretch wrapping machine that can fix items.

[0002]

2. Description of the Related Art On a rotary table equipped with a conveyor for loading and unloading articles to be packaged, if necessary, the articles to be packaged are stabilized by a pressing device, and while the articles to be packaged make one revolution, the surroundings of the articles to be packaged. Regarding the full-web type automatic stretch wrapping machine in which only one layer of a stretch film is wound on and fixed to an object to be packaged, Japanese Patent Application No. 4-235150 and Japanese Patent Application No. 5-53288 filed by the present applicant. Disclosed in the book.

[0003]

However, in the full-web type automatic stretch wrapping machine disclosed in Japanese Patent Application No. 4-235150, as shown in FIGS. It is sandwiched between the heat sealer 26 and the air tube 16 at a position closer to the object to be packaged than the wound start end and the end end of the stretch film by heat-sealing, so that the film Even after cutting, the part from the sealing part to the tip of the film sandwiched between the fingers 12 and 13 remains protruding from the side surface of the packaged object, and the part is detected by the detector in the automatic warehouse and malfunctions. There was a problem that caused the.

The apparatus disclosed in Japanese Patent Application No. 5-53288, which was made in order to solve the above problems, is a full-web type automatic stretch wrapping machine of Japanese Patent Application No. 235150 shown in FIGS. 19 to 20. Fingers 1 and 2 clamped from the column-shaped gripper 10 at the tip of the stretch film
3 is replaced with a film intermittent feeding mechanism which also serves as a film edge holding means, and the tip of the film is pushed from the swing arm between the fingers 12 and 13 of the pillar gripper 10 ( 1) The pushing blade 28 is removed, the number of heat sealers is increased to a pair, and the film is cut between these heat sealers, so that the extra portion Fa of the film formed at the tip of the heat seal portion is formed.
Was able to shorten the length of.

However, in the apparatus of Japanese Patent Application No. 5-53288, as shown in FIGS. 21 to 23, the seal portion S2 formed by the heat sealer 53 on the rear side in the film feeding direction is used in the next packaging cycle. When connecting the winding start end and the winding end of the stretch film by heat-sealing, the stretch film is located at a position where the heat sealer 51 abuts and is connected by the seal portion S2 so as not to be heat-sealed again. Since the stretched film F thus moved is moved to a predetermined size (for example, about 20 mm) by the film intermittent feeding mechanism, there is a disadvantage that the film of this length is wastefully discharged as waste.

The present invention has been made in view of the above circumstances, and its object is to stabilize the object to be packaged by a pressing device on a rotary table equipped with a conveyor for loading and unloading the object to be packaged. While the package rotates once, a stretch film wider than the height of the package can be tensioned and wrapped around the package only once to tighten and fix the package, and the film is wasted. Another object of the present invention is to provide a full-web type automatic stretch wrapping machine capable of shortening the extra film portion formed at the tip of the seal portion of the stretch film without discharging it as waste.

[0007]

SUMMARY OF THE INVENTION In the present invention, Japanese Patent Application No.
A second pushing blade is provided adjacent to the front end in the film feeding direction of the heat sealer of the swing arm of the full-web type automatic stretch wrapping machine of 235150 specification, and is opposed to the second pushing blade of the pillar-type gripper. By providing the receiving groove in the portion, the extra film portion formed at the tip of the seal portion of the stretch film can be shortened without wastefully discharging the film as waste.

That is, in order to solve the above-mentioned problems, the full-web type automatic stretch wrapping machine of the present invention is provided with a rotary table equipped with a conveyor for loading and unloading articles to be packaged, and provided on the base frame independently of the table. The trolley is provided with a film unwinding device for unwinding the winding of the stretch film wider than the height of the packaged object, and a tension applying device for tensioning the film. The table is stopped every time, a tip of the stretch film is clamped on the rotary table in the vicinity of the periphery thereof over the entire width of the film, and a column-type gripper that rotates 360 ° at the time of starting is attached, and the frame is also provided. A first pushing blade that pushes the tip portion of the stretch film between the fingers of the pillar-shaped gripper, and a flap that is wrapped around the article to be wrapped. A heat sealer for thermally adhering the winding start end and the winding end of the rum, and a knife mechanism for cutting the stretch film between the heat sealer and the fingers, immediately after stopping the rotary table, the pillar type In a full-web type automatic stretch wrapping machine provided with a swinging arm swinging toward a gripper, the swinging arm is provided with a second pushing blade adjacent to a front end of the heat sealer in the film feeding direction, and The pillar-shaped gripper has a structure in which a receiving groove is provided in a portion facing the second pushing blade. In addition, in the device of the present invention, it is preferable to provide a device for pressing an object to be packaged that moves up and down along the gantry.

[0009]

In the apparatus of the present invention, Japanese Patent Application No. 4-23515
As in the case of the device of No. 0, if necessary, the device for pressing the object to be packaged stabilizes the object to be packed on the rotary table, and then the pillar-type gripper attached near the periphery of the rotary table holds the tip of the stretch film. While rotating as it is, after rotating 360 °, by rotating once with the rotary table,
Wrap the tensioned stretch film around the package only once.

After the rotary table is stopped, the swing arm swings toward the pillar-shaped gripper and engages with it to slide the stretch film at the winding start end and winding end with the guide roller. Release the winding start end of the stretch film held by the fingers of the pillar-shaped gripper in the state of being held by the stopper member, cut the end portion of the winding by the knife mechanism, and then with the heat sealer, stretch film The heat-sealing connection between the winding start end and the end of the previously cut end of the winding end that is close to the object to be packaged, and the other end of the stretch film that has not been heat-sealed before cutting Is clamped by the fingers as the winding start end portion in the next step, the swing arm returns to the origin, and the entire packaging step is completed. In this way, the packaging machine of the present invention has the function of tensioning the stretch film around the article to be wrapped and winding only one layer, and tightening and fixing the article to be packaged.

In particular, in the apparatus of the present invention, the second pushing blade provided adjacent to the front end of the heat sealer of the swing arm in the film feeding direction cuts the stretch film, and after the stretch film is cut, the two stretch films are stacked. The heat-sealing portion of the stretch film is displaced toward the end portion of the film by pushing the heat-sealing portion of the stretch film into the receiving groove provided on the column-shaped gripper so that the heat-sealing portion of the stretch film is on one side surface of the packaged object. The effect of forming a short seal portion of the extra film portion is achieved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to this. FIG. 1 is a schematic plan view showing an overall image of an embodiment of the device of the present invention, in which a supporting arm of a device for pressing an object to be packaged is omitted for easy understanding of the drawing. Figure 2
1 is a schematic side view of the device of FIG. 1, FIG. 3 is a schematic plan sectional view for explaining the structure of a pillar-type gripper, and FIG. 4 is a mechanism for supplying a power source to an operating device on a rotary table. In the schematic cross-sectional side view of the rotary table, some devices such as a motor and a speed reducer for rotating the table are omitted for easy viewing.

FIG. 5 is a schematic plan sectional view for explaining the structure of the swing arm, and FIG. 6 is a schematic perspective view for explaining the structures of the column-type gripper and the swing arm. The parts are cut away or omitted in the drawing. 7 and 8
9 and 9 are schematic plan views for explaining the continuous operation of the apparatus of FIG. 1, wherein A to C in FIG. 7, DF in FIG. 8 and G in FIG. Indicates. 10 to 1
7 is a schematic plan sectional view for explaining the operation of the columnar gripper and the swing arm following G in FIG. 9, and each shows each stage of the operation. FIG. 18 is a schematic plan view of the device of FIG. 1, showing the operating state subsequent to FIG.

In the figure, reference numeral 1 is a base frame, 2 is a rotary table, 3 is a chain conveyor, 4 is a gantry, 5 is a film unwinding device, 6 is a drive roller stretching mechanism which is a tension applying device, and 7 is a cover. Package holding device, 8 is a taper cone for locking, 9 is an object to be wrapped, 10 is a column-type gripper, 11 is a receiving hole for the taper cone, 12 and 13 are fingers, 1
Reference numerals 4 and 15 are air cylinders for operating the fingers 12 and 13, respectively, 16 is an air tube, 17 and 18 are anti-slip members, 19 is a chuck holder, 20 is a swing arm, and 2 is a swing arm.
Reference numerals 1 and 22 are film guide rollers, 23 is a brake shoe, and 24 and 25 are springs.

Reference numeral 26 is an impulse heat sealer, 27 is a hot wire cutter, 28 is a first pushing blade, 29 is a chuck, 30 is an air cylinder for moving up and down the package pressing device, 31 is an air cylinder for rocking a rocking arm,
32 is an air cylinder that operates the chuck, 33 is an air cylinder that moves the heat wire cutter back and forth, and 34 is the first
An air cylinder for moving the pushing blade back and forth, an air cylinder for moving the taper cone up and down, a reference numeral 36 for a gear motor with a brake for rotating the pillar-shaped gripper 360 by 360 °, a reference numeral 37 for a gear motor with a brake for driving the chain conveyor 3, 38 and 39 are slip rings, and 40 and 41 are rotary joints. Also,
42 is a second pushing blade, 43 is a receiving groove, and 44 is an air cylinder for moving the second pushing blade back and forth.

The apparatus of this embodiment shown in FIGS. 1 and 2 comprises a conveyor 3 for loading and unloading an article 9 to be packaged, a rotary table 2 which is stopped at every rotation, and a rotary table on the base frame 1 which is independent of the rotary table. And a stanchion 4 provided on the stanchion, and a film unwinding device 5 for unwinding the winding of a stretch film having a width wider than the height of the article 9 to be wound, and a tension applying device for tensioning the film. It is composed of two rollers that are forcibly driven as follows. The downstream roller is rotated at a higher peripheral speed than the upstream roller, and it is lifted and lowered by the operation of the drive roller stretching mechanism 6 and the air cylinder 30 that stretches the film between these rollers. An object-to-be-packaged pressing device 7 is attached to stabilize the package 9 by pressing it from above. A column-shaped gripper 10 is attached near the periphery of the rotary table 2, and the column-shaped gripper 1 is mounted on the base frame 1.
A swing arm 20 that swings toward 0 and engages with the swing arm 20 is provided.

Next, the pillar type gripper 10 and the swing arm 20 are provided.
Will be described in detail. As shown in FIGS. 3 and 6, the pillar-shaped gripper 10 has a pair of fingers 12 and 13 for holding the tips of the stretch film F and air cylinders 14 and 15 for operating the fingers, respectively. As shown in FIG. 6, a plurality of sets are attached at regular intervals in the upper and lower directions. Further, one air tube 16 extending over substantially the entire length is attached to the pillar-type gripper 10. This is a backup member when heat-sealing the winding start end and the winding end of the stretch film F. Fulfill the role of. The receiving groove 43 is provided adjacent to the front end of the air tube 16 in the film feeding direction.
Is provided.

A receiving hole 11 for a locking taper cone is provided on the top surface of the pillar-type gripper 10, and when the pillar-type gripper 10 and the swing arm 20 are engaged with each other, a support arm for the object-to-be-packaged pressing device 7 is supported. Attached to the lock taper cone 8 that moves up and down by the operation of the air cylinder 35.
(See FIG. 2) descends and is inserted into the receiving hole to fix the column-type gripper 10. Further, when the pillar-type gripper 10 is engaged, anti-slip members 17 and 18 are attached to the positions where the film guide rollers 21 and 22 attached to the swing arm are attached, respectively. A chuck receiver 19 is attached to a portion of the chuck 20 which is engaged with the chuck 29.

As shown in FIG. 4, a pillar-type gripper 1
At the lower end of 0, a slip ring 39, a rotary joint 41, and a gear motor 36 with a brake for rotating the pillar gripper 10 360 ° are attached. The actuators mounted on the rotary table 2, including the pillar gripper 10, include slip rings 38 mounted on the rotary shaft of the rotary table 2 as well as other types of automatic stretch wrapping machines. Electric power and compressed air are supplied through the rotary joint 40. Electric power is supplied from the slip ring 38 to the brake geared motor 37 that drives the chain conveyor 3 and the brake geared motor 38 that rotates the pillar gripper 10. Further, the electric power for controlling the solenoid valves of the air cylinders 14 and 15 and the air tube 16 for operating the fingers 12 and 13 on the pillar gripper 10 from the slip ring 38 through a slip ring 39 attached to the lower end of the pillar gripper 10. Is supplied. Further, compressed air is supplied from the rotary joint 40 to the air cylinders 12 and 13 and the air tube 16 through a rotary joint 41 attached to the lower end of the pillar-type gripper 10.

Next, referring to FIGS. 5 and 6, the swing arm 2
The structure of 0 will be described. At the lower end of the swing arm 20, an air cylinder 31 for swinging the arm toward the pillar gripper 10, a chuck 29 for engaging the arm with the pillar gripper 10, and a chuck 29 for operating the chuck 29. An air cylinder 32 is attached. Film guide rollers 21 and 22 are attached to both left and right ends (in FIG. 5) of the swing arm 20, and when the arm is engaged with the pillar-type gripper 10, the roller 2 is attached.
The springs 24 and 25 respectively press-contact the anti-slip members 17 and 18 of the pillar-type gripper 10 with the springs 1 and 22 to sandwich the stretch film F therebetween.

The film guide roller 2 upstream of the feed path of the stretch film F (that is, the right hand in FIG. 5).
2 has a built-in ratchet (not shown),
While the stretch film F is sandwiched between the anti-slip member 18, the stretch film F is allowed to move from the upstream side to the downstream side, but is not moved in the opposite direction. In addition, the film guide roller 2 on the downstream side
1, the brake shoe 23 is built in, and when the swing arm 20 engages with the pillar-type gripper 10 and the film guide roller 21 is pressed against the anti-slip member 17, the force of the spring 24 brakes the film guide roller 21. The shoe 23 is pressed, and the film guide roller 21 is not rotated.
The stretch film F is sandwiched between 7 and. Between the film guide rollers 21 and 22, the second pushing blade 4 which moves forward and backward by the air cylinder 44 from the left hand of FIG.
2 next, the impulse heat sealer 26, and the hot wire cutter 27 operated by the air cylinder 33 on the right next to it.
Further, a first pushing blade 28 which is operated by the air cylinder 34 is attached to the right side thereof.

It should be noted that the swing arm 20 is a pillar-type gripper 1.
When engaged with 0, the second pushing blade 42 is in the receiving groove 43 of the columnar gripper 10, and the impulse heat sealer 26 is in the air tube 1 of the columnar gripper 10.
It is located at a position facing 6 respectively. Further, as shown in FIG. 6, the first pushing blades 28 are arranged at regular intervals in the vertical direction of the swing arm so that the first pushing blades 28 alternate with the fingers 12 and 13 of the pillar-type gripper 10 and are placed at positions just different from each other. Multiple sheets are attached.

Next, FIG. 1, FIG. 2, FIG. 7 to FIG. 9 and FIG.
The operation of the apparatus according to this embodiment will be described with reference to FIG. As shown in FIGS. 1 and 2, in the apparatus of the present embodiment, the chain conveyor 3 on the rotary table 2 is started in response to the carry-out signal from the upstream equipment, and the article 9 to be packaged is received from the upstream equipment. When conveyed to the center of the rotary table 2, the chain conveyor 3 is automatically stopped by an appropriate detection device such as a beam switch (not shown). Then, the object holding device 7 is lowered by the operation of the air cylinder 30, and presses the top surface of the object 9.

At the time of starting the apparatus, the pillar gripper 10 and the swing arm 20 are in the state of A in FIG. That is, the pillar-type gripper 10 is located at the position closest to the gantry 4 by sandwiching the tip of the stretch film F over the entire width of the film, and the swing arm 20 is still in the pillar-type gripper 10.
Not engaged with. Next, the pillar type gripper 10 is shown in FIG.
Driven by the geared motor 36 with a brake in the direction of the arrow indicated by B and B, it rotates 360 ° and stops in the state indicated by B in FIG.

Next, the rotary table 2 is started, makes one rotation as shown in C of FIG. 7 and D to F of FIG. 8, and stops in the state of F of FIG. During this time, the pillar-shaped gripper 10 was rotated together with the rotary table 2 while holding the end of the stretch film F, unwound from the film unwinding device 5, stretched by the drive roller stretching mechanism 6, and tensioned. The stretch film F is wrapped around the article to be packaged 9. At that time, it is preferable to set the speed at which the drive roller stretching mechanism 6 delivers the stretched stretched film F to be slightly higher than the speed at which the rotating packaged object 9 pulls the stretched film. (See French Patent Application Publication No. 2281275)

When the rotary table 2 thus makes one rotation and stops at the position shown in F of FIG. 8, the lock taper cone 8 is lowered by the operation of the air cylinder 35, and is provided on the top of the pillar-type gripper 10. It is inserted into the receiving hole 11 of the tapered cone, and the pillar-shaped gripper 10 is fixed. Next, the swing arm 20 swings by the operation of the air cylinder 31 (FIG. 9), and the chuck 29 engages the pillar-type gripper 10 at its root. The state at this time is shown in FIG. That is, the tip end (rolling start end portion) of the stretch film F has a columnar gripper 10 and fingers 12.
And 13 are clamped at the position on the left side of FIG. In addition, the winding end portion of the stretch film F is sandwiched between the film guide rollers 21 and 22 of the swing arm 20 and the slip preventing members 17 and 18 of the pillar-type gripper 10 so as not to reverse, as described above. There is. Also,
Air tube 1 attached to pillar-type gripper 10
Since air is not yet supplied to 6, the stretch film F is not pressure-bonded to the impulse heat sealer 26, and the heat sealer itself is not energized. In addition, the heat wire cutter 27 and the first pushing blade 28
In addition, the second pushing blade 42 stands by at the position before the operation.

Next, as shown in FIG. 11, a pillar type gripper 1
No. 0 air cylinder 15 is actuated, the fingers 13 are retracted, the winding start end of the stretch film F is released, and then the hot wire cutter 27 is energized as shown in FIG. 12, and at the same time the air cylinder 33 is actuated. The heat wire cutter 27 is moved forward to cut the end portion of the stretch film F. When the cutting is completed, the energization is stopped, the air cylinder 33 operates again, and the hot wire cutter 27 returns to the origin. One of the cut ends is sandwiched between the film guide roller 21 and the anti-slip member 17, and the other end is sandwiched between the film guide roller 22 and the anti-slip member 18, respectively.

At this time, as shown in FIG. 13, when the air cylinder 44 is actuated, the second pushing blade 42 moves forward to push the two-layer stretch film F into the receiving groove 43. , Winding start end released from fingers 12 and 13 and hot wire cutter 2
The cut ends in the front of the film feeding direction (that is, near the object to be packaged) cut in 7 are both drawn toward the heat sealer 28. This is to shorten the extra film portion Fa formed at the tip of the heat seal portion S.

Next, as shown in FIG. 14, the air tube 1
6 is supplied with air, and the stretch film F is pressure-bonded to the impulse heat sealer 28, the heat sealer 28 is energized, and the winding start end portion and the winding end portion of the stretch film F are cut toward the packaged object. Heat seal.

Then, as shown in FIG. 15, the air cylinder 34 is operated to move the pushing blade 28 forward so that the stretch film F sandwiched between the film guide roller 22 and the anti-slip member 18 (that is, heat-sealed). Not the other) cut end with fingers 12
Push between 13 and 13. As already described with reference to FIG. 6, the pushing blade 28 of the swing arm 20 and the fingers 12 and 13 of the pillar-type gripper 10 are attached at a plurality of positions (or a plurality of sets) at positions where they cross each other upward and downward. The pushing blade 28 pushes the film forward, so that the film is pushed between the fingers 12 and 13 above and below where the pushing blade 28 extrudes.

Next, as shown in FIG. 16, the air cylinder 14 is actuated, the fingers 12 move forward, and the cut end of the stretch film F pushed by the pushing blade 28 is moved to the finger 13 at the position on the right side of the figure. Sandwich between. (This cut end becomes a winding start end in the next step.) Next, as shown in FIG.
4, 15 are activated at the same time, and the fingers 12, 13 are
These fingers move in the left direction in the figure with the end of the stretch film F being held therebetween.

Next, air is evacuated from the air tube 16, the air cylinder 35 operates (for locking), the taper cone 8 rises, and the air cylinder 32 operates,
The chuck 29 returns to the origin, the engagement between the pillar gripper 10 and the swing arm 20 is released, and then the air cylinder 31 is released.
Operates to return the swing arm 20 to the origin, and releases the heat-sealed end of the stretch film F. In this way, the periphery of the article to be packaged 9 is wrapped with the tensioned one-layer stretch film F. This state is shown in FIG. Next, the package pressing device 7 returns to the origin by the operation of the air cylinder 30, the chain conveyor is automatically started in response to the carry-in acceptance signal from the downstream device, and the stretch-wrapped packaged product is transferred to the downstream device. Unpack and complete one packaging cycle.

In the apparatus of the present invention, the tension applying device for tensioning the stretch film is composed of at least two rollers which are forcibly driven at the above-mentioned different peripheral speeds, and the stretch film is interposed between these rollers. In addition to the driving roller stretching mechanism for stretching, a suitable film tension detection mechanism is added to the stretching mechanism to maintain the tension of the stretch film wrapped around the article to be wrapped at a substantially constant level. The speed may be controlled.

Depending on the required packaging specifications, a structure in which a brake roller provided with an electromagnetic brake and a guide roller for contacting a film around the brake roller are combined may be used. Further, in the case where the heat-sealed portion of the stretch film is pressed against the edge of the separate sheet and the film is torn, for example, “stretch packaging of Japanese Patent Application No. 4-273406” filed by the present applicant. It is better to use a machine tensioning device.

The device for pressing the object to be packaged used in the device of the present invention may be of the type that can be moved up and down by the air cylinder described above, or it can be moved up and down by a chain, belt or rope driven by a motor, and the entire holding plate of the pressing device is A type that loads the weight and stabilizes the packaged object may be used. The second
The length (20 to 25 mm) of the film pushed into the receiving groove by the pushing blade acts as a stress relaxation allowance when the stretch wrapping body is completed. By applying a tension about 0.5% higher than the optimum value to the stretch film, the stretch film can be saved and a tight stretch package can be obtained.

[0036]

In the apparatus of the present invention, the second pushing blade provided adjacent to the front end of the heat sealer of the swing arm in the film feeding direction (that is, closer to the object to be packaged),
After cutting the stretch film and before heat-sealing, the two stretch films are pushed into the receiving grooves provided at the opposite positions on the pillar-type gripper so that the heat-sealing part of the stretch film is moved toward the end part of the film. It is possible to form a short seal portion of the extra film portion on one side surface of the article to be packaged.

As described in detail above, according to the present invention, on a rotary table equipped with a conveyor for loading and unloading articles to be packaged,
If necessary, stabilize the item to be wrapped with the pressing device, and while the item to be wrapped is rotated once, a stretch film wider than the height of the item to be wrapped is tensioned and wrapped around the item to be wrapped only once. clamping the package, can be fixed, and a full web automatic for an extra feet portions films formed on the tip of the sealing portion of the stretch film without wastefully discharged as waste film can be shortened A stretch wrapping machine can be provided.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an overall image of an embodiment of a device of the present invention.

2 is a schematic side view of the device of FIG.

FIG. 3 is a schematic plan sectional view of a pillar-type gripper.

FIG. 4 is a schematic side sectional view of a rotary table.

FIG. 5 is a schematic plan sectional view of a swing arm.

FIG. 6 is a schematic perspective view of a pillar gripper and a swing arm.

7A to 7C are schematic plan views for explaining the operation of the apparatus of FIG. 1, and A to C show states of respective stages from the start of operation to the middle.

8 is a schematic plan view for explaining the operation of the apparatus of FIG. 1 subsequent to FIG. 7C, and D to F show states of respective stages during the operation.

9 is a schematic plan view for explaining the operation of the apparatus of FIG. 1, showing a state following F of FIG. 8;

FIG. 10 is a schematic plan view for explaining the operation of the pillar-type gripper and the swing arm subsequent to FIG.

11 is a schematic plan view for explaining the operation of the pillar-type gripper and the swing arm following FIG.

FIG. 12 is a schematic plan view for explaining the operation of the pillar gripper and the swing arm following FIG. 11.

13 is a schematic plan view for explaining the operation of the column gripper and the swing arm following FIG.

FIG. 14 is a schematic plan view for explaining the operation of the column gripper and the swing arm following FIG.

FIG. 15 is a schematic plan view for explaining the operation of the pillar gripper and the swing arm following FIG.

16 is a schematic plan view for explaining the operation of the pillar gripper and the swing arm following FIG.

FIG. 17 is a schematic plan view for explaining the operation of the column gripper and the swing arm following FIG. 16.

18 is a schematic plan view of the apparatus of FIG. 1, showing the condition following FIG.

FIG. 19 is a schematic plan sectional view of a pillar-type gripper and a swing arm of the device of Japanese Patent Application No. 4-235150, showing a state before cutting a stretch film.

20 is a schematic plan cross-sectional view of the columnar gripper and the swing arm shown in FIG. 19, showing a state after cutting the stretch film and during heat sealing.

FIG. 21 is a schematic plan sectional view of a rotary pole and a swing arm of a device of Japanese Patent Application No. 5-53288, showing a film of 2
It shows a state in which heat sealing is performed at several points and cutting is performed between the heat sealing points.

FIG. 22 is a schematic plan sectional view for explaining the operation of the rotating pole subsequent to FIG. 21.

FIG. 23 is a schematic plan sectional view for explaining the operation of the rotating pole subsequent to FIG. 22.

[Explanation of symbols]

1: base frame, 2: rotary table, 3: chain conveyor, 4: frame, 5: film unwinding device, 6: driving roller stretching mechanism (which is a tension applying device), 7: device for holding a packaged object, 8: Taper cone (for lock), 9: Object to be packaged, 10: Column-shaped gripper, 11: Taper cone receiving hole, 12, 13: Finger, 14, 15: Air cylinder, 16: Air tube, 17, 18 : Non-slip member, 19: chuck receiver, 20: swing arm 21,
22: Film guide roller, 23: Brake shoe, 24, 25: Spring, 26: Impulse heat sealer, 27: Heat wire cutter, 28: First pushing blade, 29: Chuck, 30, 31, 32, 33, 34,
35: Air cylinder, 36, 37: Geared motor (with brake), 38, 39: Slip ring, 40,
41: rotary joint, 42: second pushing blade, 43: receiving groove, 44: air cylinder, 50: rotating pole, 51: impulse heat sealer, 52: heat cutter, 53: impulse heat sealer, 5
4, 55: nip roller, 55a: lever, 56, 5
7: Air cylinder

Claims (2)

(57) [Claims] 1. A rotary table provided with a conveyor for loading and unloading an article to be packaged, and a gantry provided on a base frame independently of the table. The gantry has a width wider than the height of the article to be packaged. Of a wide stretch film for unwinding and unwinding the film, and a tension applying device for tensioning the film are provided, and the tip of the stretch film is spread over the entire width of the film on the rotary table near its periphery. A pillar-type gripper which is clamped and rotated by 360 ° at the time of starting is attached, and a stretch film is pushed between the fingers of the pillar-type gripper on the base frame.
A pressing blade, a heat sealer for thermally adhering the winding start end portion and the winding end portion of the film wound on the packaged object, and a knife mechanism for cutting the stretch film between the heat sealer and the fingers. In a full-web type automatic stretch wrapping machine equipped with a swing arm that swings toward the column-shaped gripper immediately after the rotary table is stopped, the swing arm is adjacent to the front end of the heat sealer in the film feeding direction. A full web type automatic stretch wrapping machine is characterized in that a second pushing blade is provided, and a receiving groove is provided in the column-shaped gripper at a portion facing the second pushing blade. 2. The full-web type automatic stretch wrapping machine according to claim 1, further comprising: a device for pressing an object to be packaged that moves up and down along the gantry.