JPH0558967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging device for wrapping an object to be packaged with a film such as a stretch film.

[Prior art]

This packaging device uses a transparent stretch film to wrap an item in a dish-shaped container, that is, a tray, with a transparent stretch film. A front folding member and a left and right folding member that operate in conjunction with a cam mechanism or the like for the operation of the front folding member. There is a packaging device that folds the end of the film into the bottom of the object to be packaged and wraps the object using a film folding mechanism.

In the packaging apparatus having the above structure, as shown in FIG. 8a, the elevator head 11 of the elevator mechanism is
The elevator head 11 pushes up the packaged object 12 onto the film 13 stretched in a predetermined position, and the ends of the film 13 are folded by a front folding member (not shown) and left and right folding members 14 and 15. The object to be packaged 12 is wrapped with the film 13 by folding it into the bottom of the object to be packaged 12.

[Problem that the invention seeks to solve]

However, since the packaging apparatus with the above-mentioned conventional structure has only one elevator head 11, when the object to be packaged 12 is small and the cut length of the film is short, the end of the film is attached to the elevator head as shown in FIG. 8b. 11, left and right folding member 1
When folding the ends of the film 13 at steps 4 and 15,
The ends of the film 13 are the left and right folding members 14 and 15.
There was a drawback that packaging could not be carried out because the product was placed on top of the product.

Furthermore, as an example of a packaging device that eliminates the above-mentioned drawbacks, there is one that was previously filed by the present applicant as Patent Application No. 60-24686. The packaging device changes the operation timing of the left and right folding members, and then
This packaging device has an excellent feature of being able to reliably wrap even if the size of the object to be packaged and the film cut length are small, but the packaging device has a configuration in which the drive sources for the left and right folding members and the drive source for the front folding member are different. However, the control structure is complicated, and the device is large and costly. or,
There is also the problem that when the length of the film cut is increased, the control becomes more complicated and cannot be handled.

The present invention has been made in view of the above-mentioned problems, and has a simple structure and can reliably fold the end of the film into the bottom of the packaged item even when the packaged item is small and the film cut length is short. The purpose of this invention is to provide a packaging device that can do the following.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention stretches a film cut to a predetermined length transferred by a film transfer mechanism to a predetermined part of a packaging device, and pushes up the packaged item onto the film from the lower part of the film using an elevator mechanism. In a packaging device that folds the end of the film into the bottom of the object to be packaged and wraps the object with the film by a film folding mechanism composed of left and right folding members, a front folding member, etc., the elevator head of the elevator mechanism is placed at the front. Or, it has a central head with a tip part that can be tilted by a rear folding member, and at least one tip part is arranged on the left and right sides of both sides of the central head, integrally connecting the left and right parts, and which can be tilted by the left and right folding members. The central head is divided into left and right heads, and includes a central head lifting section that lifts and lowers independently of each other in correspondence with the divided heads, and at least one lifting section for lifting and lowering the left and right heads. Depending on the size or length of the film cut, select whether to raise and lower the left and right heads of the center head, or only the center head. The left and right heads and the center head are simultaneously raised and lowered by simultaneously operating the lifting parts for raising and lowering the left and right heads and the left and right heads.
After folding at least the left and right ends of the film into the bottom of the object to be packaged, the left and right heads are lowered together with the center head, and if it is selected to raise and lower only the center head, the center head lifting section is operated to move the center head. The present invention is characterized by comprising a control means for lowering the central head after the central head is raised and at least the left and right ends of the film are folded into the bottom of the packaged object.

[Effect]

In the present invention, by adopting the above configuration, when the object to be packaged is large and the length of the film cut is long, the control means selects to raise and lower the center head and the left and right heads, and Even if the lifting parts for raising and lowering the heads are operated at the same time and the center head and left and right heads are raised at the same time, the ends of the film will hang down at the ends of the object to be packaged, and the ends of the film will fold in on the left and right sides, as shown in Figure 4a. Since the film does not run over the member, the left and right ends of the film can be reliably folded into the bottom of the packaged object using the left and right folding members. Furthermore, when the object to be packaged is small and the length of the film cut is short, the control means selects to raise and lower only the center head and operates the center head lifting section to raise and lower only the center head. As shown in Figure 4b, the film ends hang down at the ends of the packaged object, and the film ends do not ride on the left and right folding members, and the left and right folding members securely secure the left and right ends of the film. It can be folded into the bottom of the packaged item.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 3 are views showing a packaging device according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a side view (viewed from the direction of arrow A in FIG. 1), and FIG. FIG. 1 is a front view (view from the direction of arrow B).

The packaging device includes a carry-in section 10 for carrying in items to be packaged.
0, a packaging section 200 for packaging objects to be packaged, a film supply and transfer section 3 for supplying and transferring stretch film;
00, elevator mechanism 40 for pushing up the packaged items
0 and the packaged object are carried out.
It consists of 0.

The elevator mechanism 4 is carried in from the carrying section 100.
The packaged items placed on the elevator head 00 are pushed up by the elevator mechanism 400. A film cut to a predetermined length from the film supply and transfer section 300 is stretched over the packaging section 200 located at the top of the elevator mechanism 400, and the packaged items pushed up by the elevator mechanism 400 are placed on the film. Push up from below. In this state, a film folding mechanism including a later-described post-folding roller, left and right folding plates, etc. of the packaging section 200 is operated to fold the end of the film into the bottom of the object to be packaged, thereby packaging the object. The wrapped object is transported out of the packaging device from the transport section 500. Each of the above parts will be explained in detail below.

The carry-in section 100 includes a plurality of pusher belts 101 each having a pusher for pushing out the packaged items.
A pusher conveyor 104 is disposed such that both ends thereof are suspended between a driving pulley 102 and a driven pulley 103. The pusher conveyor 104 is fixed to a frame 99 of the packaging device via a carry-in frame 105. Between the pusher belts 101 of the pusher conveyor 104, a weighing plate 107 of a weight detecting section 106 for detecting the weight of the packaged object is arranged to slightly protrude. Further, the drive pulley 102 is a gear 108 that rotates in conjunction with a motor.
It is designed to be driven by gear 10
The motor rotating 8 is independent of the motors driving other parts of the packaging machine.

When an object to be packaged is placed on the weighing pan 107 of the pusher conveyor 104, the motor is driven by the weighing stability signal from the weight detection section 106, the drive pulley 102 is rotated via the gear 108, and the object is placed on the weighing pan 107. The placed object is placed on the pusher belt 101.
Transported by.

An elevator head of an elevator mechanism 400 is located at the tip of the pusher belt 101 of the carry-in section 100. The elevator head includes a central head 401 located in the center and a central head 40
It is divided into left and right heads 402 and 403 located on the left and right sides of 1. Left head 402 and right head 4
03 is fixed to the support plate 409. As shown in detail in FIG. 4a, the tips 401a and 401b of the central head 401 are rotatably supported by pins 405 and 406 in directions facing each other, and the tips 402a of the left head 402 and the right head 403 are and 403a are similarly supported by pins 407 and 408 so as to be rotatable in directions facing each other.

Support plate 412 that supports and fixes the central head 401
is fixed to the tip of the central head support rod 410, and a left head 402 and a right head 402 are attached to both ends.
A support plate 409 supporting and fixing the head 03 is fixed to the tips of left and right head support rods 411.

The lower end of the central head support rod 410 is rotatably supported at the tip of a connecting rod 414 via a pin 413, and the lower ends of the left and right head support rods 411 are also connected via a pin 415 (not shown). It is rotatably supported at the tip of a rod 416. Further, the other end of the pin 413 of the connecting rod 414 is rotatably supported by a shaft 417. A substantially central portion of the central head support rod 410 is rotatably supported by a pin 419 at the tip of a lever 418, and the left and right head support rods 4
The tip of a lever 420 is also rotatably supported approximately at the center of the lever 11 via a pin 412 (not shown). The rear end of lever 418 is fixed to shaft 422, and the rear end of lever 420 is fixed to shaft 422.
It is rotatably supported.

An electromagnetic clutch 423 is provided near the rear end of the lever 420 of the shaft 422, and by actuating the electromagnetic clutch 423, the rotational force of the shaft 422 is transmitted to the lever 420. Further, both ends of the shaft 422 are rotatably supported by a bracket 424 fixed to the frame 99.

One end of a lever 425 is fixed to one end of the shaft 422, and the other end of the lever 425 is fixed to a pin 426.
The connecting rod 427 is rotatably supported at one end of the connecting rod 427. Further, the other end of the connecting rod 427 is connected to a lever 428.
The lever 428 is rotatably supported at one end thereof, and the other end of the lever 428 is rotatably supported by a pin 430 on a bracket 429 fixed to the frame body 99. A cam floor 431 is rotatably supported approximately at the center of the lever 428.
A cam 432 is adapted to engage with the cam 432.

The cam 432 is fixed to a rotating shaft 434 of a reducer 433, and rotational force is transmitted to the reducer 433 from a motor 435 via a belt 436, so that the rotation speed of the motor 435 is adjusted to a predetermined reduction ratio. is slowing down. Further, a speed reducer 433 or a timing disc 437 is attached to rotate in conjunction with the rotation shaft thereof.

In the elevator mechanism 400 configured as described above, the rotation of the motor 435 rotates the cam 432 via the reducer 433, and the rotation of the cam 432 causes the lever 428 to swing up and down about the pin 430. By vertically swinging the lever 428, the connecting rod 42
7 and lever 425, the shaft 422 rotates. The rotation of the shaft 422 causes the lever 418 to move
22 and swings up and down about the shaft 422 as the center of rotation. In conjunction with the vertical swing of the lever 418, the central head 401 moves up and down via the central head support rod 410. In addition, the electromagnetic clutch 4
23, the rotational force of the shaft 422 is transmitted to the lever 420, and the left and right heads 402, 403 are also raised and lowered together with the center head via the left and right head support rods 411.

A packaging section 200 is located above the elevator mechanism 400.
The packaging unit 200 includes a rear folding roller 201, a left folding plate 202, a right folding plate 203, and a front folding roller 241. Both ends of the rear folding roller 201 are rotatably supported by the tips of sliding members 204 and 205. The sliding members 204 and 205 are adapted to slide along guide rails 208 and 209, respectively.

The ends of connecting rods 210, 210' are rotatably supported on each of the brackets 206, 207, and the other ends of the connecting rods 210, 210' are rotatably supported on one end of cranks 211, 211'. It is pivotally supported. The other ends of the cranks 211, 211' are fixed to both ends of the shaft 212. The left folding plate 202 and the right folding plate 203 are fixed to a cam plate 213 (not shown) and a cam plate 214, respectively, and a cam groove 214a is formed in the cam plate 214. Further, similar cam grooves are formed on the cam plate 213 as well. Mounting plates 215 and 216 are attached to the respective sides of the cam plates 213 and 214, and the rod 21 is attached to the mounting plates 215.
Sliding members 219 and 22 that slide on 7 and 218
0 is attached. The mounting plate 216 also has a sliding member 2 on which the rods 217 and 218 slide.
21 and 222 are attached.

Guide rails 225 and 226 are disposed above the guide rails 208 and 209, and mounting plates 223 are provided on the guide rails 225 and 226, respectively.
Sliding members 227 and 228 fixed to both ends are slidably fitted. At the front end of the mounting plate 223, there is a pusher 2 for discharging the packaged items.
24 is attached. Brackets 229 and 230 are fixed to both ends of the mounting plate 223, and the ends of connecting rods 231 and 232 are rotatably supported on the brackets 229 and 230, respectively. The ends are pivotally supported by cranks 233 and 234, respectively. It is fixed to a shaft 235 at the other end of the cranks 233, 234.

The shaft 212 has a motor 2 for driving the rear folding roller.
36 is transmitted to the shaft 235 via a gear 237, and the rotational force of a discharge pusher driving motor 238 is transmitted to the shaft 235 via a gear 239.

In the packaging section 200 configured as described above, the rear folding roller 201 and the left and right folding plates 202, 203
is driven by a rear folding roller drive motor 236.
The connecting rod 2 is driven by the swinging of the cranks 211 and 211' attached to both ends of the shaft 212.
brackets 206, 20 via 10, 210'
7. As a result, the sliding members 204, 20
5 moves forward along the guide rails 208 and 209, and the rear folding roller 201 also moves forward. After this, at the same time as the folding roller 201 moves forward, the sliding member 2
Guide rollers 240 (not shown) and 241 attached to the rear end of the cam plate 2
13 (not shown) and 214, the sliding member 2
19, 220 and sliding members 221, 222 also slide along the rods 217, 218, and the left and right folding plates 202 and 203 also move toward each other. When the rear folding roller drive motor 236 is reversed, the rear folding roller 201 moves backward due to the operation opposite to the above, and the left and right folding plates 202
and 203 move away from each other. The pusher 224 is driven by driving the ejection pusher drive motor 238, and force is transmitted to the brackets 229, 230 via the connecting rods 231, 232 by swinging cranks 233, 234 attached to both ends of the shaft 235. be done. As a result, the sliding members 227, 228 are moved to the guide rails 225, 2
26 to advance the pusher 224 attached to the front end of the mounting plate 223. When the discharge pusher drive motor 238 is reversed, the pusher 224 is moved backward by an operation opposite to that described above.

The object to be packaged is discharged onto the heater roller 501 of the carry-out section 500 by the pusher 224, and the front end of the film is folded into the bottom of the object by the front folding roller 241.

The film supply and transfer section 300 includes support rollers 301 and 3 that support the stretch film roll F.
02 is rotatably supported at both ends. The support roller 301 receives rotational force from a pulley 304 through a belt 303 and is rotated via a pulley 305. Pulley 305
is integrally attached to a feed roller 305' (not shown) that feeds out the film f from the film roll F. A cutter 306 is disposed between the pulleys 304 and 305, and cuts the film f from the stretch film roll F into a predetermined length. Note that 307 is a blade holder for the cutter 306.

A film transport mechanism 308 and a transport mechanism 308' are disposed in front of the pulley 304 for gripping and transporting both ends of a film cut to a predetermined length. The film transport device 308 has a film transport belt 309.
09 is suspended at both ends by the driving pulley 310 and the pulley 304. The transfer mechanism 308' also has substantially the same configuration. Drive pulley 310 is gear 3
11, via chain 312 and belt 313,
It is configured to rotate by receiving rotational force from a motor 314.

The surface of the film transport belt 309 is formed with irregularities, and both ends of the film f can be held between the film transport belt 309 and the contact plates 315 and 316 by elastic action. The friction coefficient of the surface 309 is made larger than the friction coefficient of the surfaces of the contact plates 315 and 316. A film transport belt 309' and a backing plate 31 having the same structure are installed in parallel with the film transport belt 309.
5', 316' (not shown) are arranged. In the figure, reference numeral 317 denotes a tension roller for applying a predetermined tension to the film, and the two rollers are urged to rotate counterclockwise. Also, 31
Reference numeral 8 denotes a distance adjustment handle for adjusting the distance between the film transfer belts 309, 309' in accordance with the width of the stretch film roll F to be used.

In the packaging apparatus configured as described above, the film f from the stretch film roll F of the film supply section 300 passes alternately over the surfaces of the pair of tension rollers 317, passes through the film feeding roller 305', and then passes through the contact plate 316 and the film transport belt 309. guided between. When the film f is transferred by a predetermined amount,
The cutter 306 is operated to cut the film f to a predetermined length. The film f cut to a predetermined length is held at a predetermined position of the packaging section 200 located at the upper part of the elevator mechanism 400 with its both sides sandwiched between the film transport belt 309 and the plate 315.

On the other hand, the pusher conveyor 104 of the loading section 100
The object to be packaged placed on the pusher belt 101 is actuated by a measurement signal from the weight detecting section 106 or a detection signal from a packaging detector (not shown), and the object to be packaged is moved onto the elevator head of the elevator mechanism 400. to be carried out. Whether or not the object to be packaged has been carried out onto the elevator head is determined by detecting the front end of the object to be packaged with a detector (not shown). Next, the elevator mechanism 400 is driven to lift up the packaged items.While the central head 401 always moves up and down as described above, the left and right heads 402, 40
3 operates the electromagnetic clutch 423 to move the electromagnetic clutch 423 up and down depending on the cut length of the packaged item or film. If it is less than a predetermined value, the electromagnetic clutch 423 is deactivated and only the central head 401 is raised or lowered.

As a result, when the object to be wrapped is large and the length of the film cut is long, even if the center head 401 and the left and right heads 402, 403 are operated simultaneously as shown in FIG. Even if the front folding roller drive motor 236 is driven, the ends of the film F will not run over the left and right folding plates 202, 203, allowing for reliable wrapping. If the cut length of the film f is small, only the center head 401 in FIG. , 203, and packaging can be carried out reliably. In addition, since an elevator head with a large contact area can be used for large objects to be packaged, it is possible to eliminate warping of the packaged objects due to the tension of the film. Good packaging can be done.

Rear folding roller 201 and left and right folding plates 2
02 and 203, the rear and left and right ends of the film f are folded into the bottom of the object to be packaged, and then the discharge pusher drive motor 238 is driven, and the pusher 224 unloads the wrapped object. 500. By pushing the object to be packaged with the pusher 224, the film transport belt 30
The front end of the film, which was held between 9 and the abutment 315, is folded into the bottom of the packaged object by the front folding roller 241. After the end of the film f is folded into the bottom of the object to be packaged, the film f is discharged to the heater roller 501 of the unloading section 500, and the film f is welded by the heat of the heater roller 501, completing the packaging of the object.

The front folding roller driving motor 236 and the discharge pusher driving motor 238 are started at predetermined timing from a timing disk 437, and stopped by detection of flags attached to the shafts 212 and 235.

Note that 600 is a display section 601, an operation section 602,
The label printer 600 is equipped with a label issuing port 603 and the like, and the label printer 600 can be attached when necessary.

FIG. 5 is a block diagram showing the system configuration of the control section of the packaging apparatus when a label printer 600 is attached.

The control unit 20 on the label printer 600 side includes a read-only memory (ROM) 21, a random access memory (RAM) 22, a measuring unit 23, a label printing unit 24, a central processing unit 25, and an operation display unit 26. Control programs and control data are stored in the ROM 21 in advance. The weighing section 23 is a section that receives a signal from the weight detection section 106 of the loading section 100, and the label printing section 24 prints data such as weight, unit price, price, etc. on the label, and also prints the data from the label issuing port of the label printer 600. The operation display unit 26 is a part that outputs data to be displayed, and outputs display data to the display unit 601.
This is the part that receives data from 2. The control section 30 on the packaging machine side includes a ROM 31, a RAM 32, a central processing unit 33, an operation section 34, and a device control section 35. The equipment control unit 35 includes a packaged article supply drive control unit 36 that controls the pusher conveyor 104 of the loading unit 100, and a motor 4 of the elevator mechanism 400.
35, an elevator mechanism drive control section 37 for controlling the electromagnetic clutch 423, etc., and a film transport mechanism 3.
08, cutter 306, etc., and a packaging section 200.
The rear folding roller 201 and the left and right folding plates 20
2, 203, etc., a package discharge control section that controls the drive of the discharge pusher 224 and discharges the wrapped object, and a film clamp that controls the film clamp drive mechanism. A drive control section 41 is connected.

FIG. 6 is a block diagram showing details of the elevator mechanism drive control section 37. The timing detection sensor 50 detects an optical signal passing through a timing disk 437 that rotates in conjunction with the rotation of the motor 435.
It is sent to the device control section 35. The central processing unit 33 sends a signal to the motor drive circuit 51 via the device control unit 35 to drive the elevator drive motor 435 to drive the central head 40 of the elevator mechanism 400.
1, and the electromagnetic clutch drive circuit 5
The left and right heads 402, 4
03 is raised/lowered or made inoperable.

FIG. 7 is a diagram showing the control flow of the elevator mechanism. In this embodiment, the film cut length is set to seven levels from "1" to "7"("1" is the shortest and "7" is the longest), and when the length is "5" or more, the left and right heads 402 and 403 are also operated. Assuming “1”～
"4" means that only the central head 401 is operated. In the packaging apparatus of the above embodiment, the object to be packaged is placed on the pusher conveyor 104, and packaging is started by a measurement stability signal from the weight detection section 106 or a detection signal for the object to be packaged from the detector. In this case, first determine whether the film cut length is "5" or more (step A), and if YES, the electromagnetic clutch 4
23 (step B), then motor 435
(step C), and the left and right heads 402 and 403 are also raised together with the center head 401. If NO in step A, the motor 435 is immediately driven to raise only the central head 401.

The film cut length can also be set by operating the operating section 34 on the packaging machine side.
For example, the film cut lengths ``1'' to ``7'' are set in advance by the label printer 6 in accordance with the product number of the packaged item.
It is preset with data such as unit price and tare in the RAM 22 of the control unit 20 of 00, and by inputting the product number by operating the operation unit 602, the film cut length is set and the elevator head to be raised and lowered is selected. It is also possible to configure it as follows. Further, in the above embodiment, it is determined whether or not to raise the left and right heads 402, 403 based on the length of the film cut. However, the length of the film cut is determined based on the size of the packaged item. Therefore, it goes without saying that the above judgment may be made based on the size of the object to be packaged. In this case, in addition to inputting the size of the packaged item from the operation section or presetting it in advance as described above, it is also possible to arrange a sensor in the loading section and configure it to be detected by the sensor. It will be done.

In the above embodiment, the elevator head is divided into a central head 401 and left and right heads 4 which are integrally connected.
Although an example in which the film is divided into 02 and 403 parts is shown, it is also possible to have one or more left and right heads and finely control the number of left and right heads to be raised and lowered depending on the size of the object to be packaged or the length of the film cut. Of course.

Furthermore, even when such an elevator mechanism 400 is applied to a conventional packaging device, it is only necessary to select the elevator head without having to control the actuation timing of the left and right folding plates depending on the length of the film cut. It is very simple and similar effects can be expected.

〔Effect of the invention〕

As explained above, according to the present invention, depending on the size of the object to be packaged or the length of the film cut, the lifting section for raising and lowering the center head and the lifting section for raising and lowering the left and right heads can be operated simultaneously, or the lifting section for raising and lowering the center head can be operated at the same time. Since only the elevating part is operated, even when the object to be packaged is large or the length of the film cut is small, the film has an excellent effect in that the film does not ride on the left and right folding members and the wrapping can be carried out reliably.

[Brief explanation of the drawing]

1 to 3 are views showing a packaging device according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a side view (viewed from the direction of arrow A in FIG. 1), and FIG. Figure 1 is a front view (view from the direction of arrow B), Figures 4a and 4b are diagrams showing the operating state of the elevator head of the packaging machine according to the present invention, and Figure 5 is a view of the control section of the packaging machine according to the present invention. A block diagram showing the system configuration, FIG. 6 is a block diagram showing details of the elevator drive control section, FIG. 7 is a diagram showing the control flow of the elevator mechanism, and FIG. 8 is a diagram showing the operating state of the elevator head of a conventional packaging machine. FIG. In the figure, 100... Loading section, 200... Packaging section,
300...Film supply unit, 400...Elevator mechanism, 500...Export unit, 600...Label printer.

Claims (1)

[Scope of Claims] 1. A film cut to a predetermined length, transferred by a film transfer mechanism, is stretched over a predetermined part of a packaging device, and an item to be packaged is pushed up from the bottom of the film by an elevator mechanism, and the film is folded left and right. A packaging device that folds the end of the film into the bottom of the object to be packaged and wraps the object with the film by a film folding mechanism composed of a member, a front folding member, etc. A central head with a tip part that can be tilted by a folding member, and at least one tip part arranged on the left and right sides of both sides of the central head to integrally connect the left and right parts, and which can be tilted by the left and right folding members. The package is divided into left and right heads, and includes a central head lifting section that lifts and lowers independently of each other in correspondence with the divided heads, and at least one lifting section for lifting and lowering the left and right heads. Depending on the size or length of the film cut, it is selected whether to raise and lower the center head and the left and right heads, or only the center head, and if it is selected to raise and lower the center head and the left and right heads, The center head lifting section and the left and right head lifting sections are operated simultaneously to raise the left and right heads and the center head at the same time. If it is selected to lower the film along with the film head and to raise and lower only the center head, operate the center head elevating part to raise the center head, and after folding at least the left and right ends of the film into the bottom of the packaged object, A packaging device characterized in that it comprises control means for lowering said central head. 2. The control means presets the length of the film cut according to the product number of the object to be packaged, and selects whether or not to raise and lower the left and right heads depending on the product number designation. Packaging equipment as described in section.