JPH0748488Y2 - Film supply control device for packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a film supply device in a packaging machine for stretch-wrapping an article to be packaged such as fresh food with a stretch film.

(Prior Art) Generally, there is known a stretch wrapping machine that wraps an article such as fresh food stored in a polystyrene foam tray with a stretch film together with the tray. This type of packaging machine generally includes a roll support device that rotatably supports a film roll in which a stretch film having a predetermined width dimension is wound, and both side edges of the stretch film cut into a predetermined length. A film supply device that sandwiches the film and supplies it to the packaging unit, a lifter device that pushes up the articles stored in the tray from below the stretch film held in the packaging unit, and a stretch film on the bottom side of the tray that is pushed up by the lifter device. And a wrapping device that folds and wraps the peripheral portion of the.

By the way, in this type of packaging machine, if a certain tension is applied to the film in the process of packaging the tray containing the articles by the stretch film supplied from the film supply device, the product after packaging is Will be beautifully finished. In this case, since both side edges of the film are held by the film feeding device or the like in the width direction, it is easy to give tension, but there is a problem that it is difficult to hold the film in a tension state in the longitudinal direction at right angles thereto. .

For such a problem, for example, as disclosed in Japanese Patent Laid-Open No. 63-71060, a dancer roller device for applying a tension force in the longitudinal direction of the film between the film roll and the film supply device. It is possible to arrange.

(Problems to be solved by the invention) However, when the dancer roller device is provided as described above, not only is it necessary to precisely control the dancer roller device in order to apply a certain tension to the film, but the dancer roller device is also required. In the apparatus, since the film is bent and routed, the setting of the film roll becomes complicated and the workability is deteriorated.

In particular, in the type in which the film is cut before shifting to the packaging process, the tension force applied by the dancer roller device does not reach the film piece after cutting, and therefore, when the tray is wrapped, the film is cut. The tension in the longitudinal direction does not act on the piece, which may cause packaging failure.

Therefore, in view of the above problems in the stretch wrapping machine, the present invention is a film that is fed to a wrapping station while holding the feeding roller that feeds the film from the film roll while capturing the film and the side edges of the film that is fed by the feeding roller. A simple structure in a packaging machine provided with a transport mechanism and a perforation forming means which is disposed between the film transport mechanism and the feeding roller and forms perforations for cutting in the width direction of the film. Therefore, it is an object of the present invention to apply a tension force in the longitudinal direction to the cut film so that the film can be supplied to the packaging unit.

(Means for Solving the Problem) That is, the film supply control device of the packaging machine according to the present invention is configured to be driven by the first driving unit to feed the film from the film roll while capturing the film, and the second driving unit. A film transport mechanism that is driven and transports to the packaging station while holding both side edges of the film delivered by the delivery roller, and is disposed between the film transport mechanism and the delivery roller, and the width direction of the film. In a packaging machine provided with a perforation forming means for forming perforations for cutting, while stopping the film supply operation at the time of operating the perforation forming means, at least one of the stop or the next start of supply. In the above, the state in which the first driving means is stopped and the second driving means is in operation is generated, and the feeding roller is It is characterized by having control means for activating the first and second driving means at different timings so that the film is tensioned in the longitudinal direction on the downstream side.

(Operation) According to the above configuration, the film feeding roller and the film transport mechanism are driven by operating the first and second driving means, and the film fed from the film roll is fed to the film transport mechanism. The transport mechanism receives the film sent from the delivery roller and transfers it to the packaging station. In order to form perforations for cutting in the continuous film in the process, the feeding operation of the film is stopped, but in that case, the film is tensioned in the longitudinal direction on the downstream side of the feeding roller. The first and second driving means are operated with a timing shift. Therefore, when the film transport mechanism restarts the transport operation next time, a tension force in the longitudinal direction acts on the film, and the tension state is maintained to the packaging station even after the film is cut. Will be transported. This allows
At the wrapping station, the film is held in a vertically and horizontally tense state, and the finished product after wrapping becomes good. Moreover, in the structure in which the control means shifts the operation timings of the first and second drive means to tension the film, the operation timings of the first and second drive means can be easily changed. By making such a change, it becomes possible to easily adjust the tension of the film. Therefore, even if the tension of the film varies depending on conditions such as the material and thickness of the film or the temperature and humidity, it is possible to change the operation timing of the first and second drive means. It is possible to easily and easily adjust the tension so that it is in an optimal state, and fine adjustment is possible.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the packaging machine 1 includes a weighing-in / carrying-in device 2 provided at the center of the front surface of the main body 1a and the main body 1a.
A roll supporting device 4 that rotatably supports a film roll 3a, in which a stretch film 3 having a predetermined width and wound on multiple sides is rotatably supported, and a film 3 fed from the roll supporting device 4. And a film supply device 6 (see FIG. 2) for supplying the film to a packaging station 5 formed in the main body 1a located above the weighing-in device 2 by sandwiching both side edges in the width direction of the packaging station 5. A packaging device 7 (see FIG. 3) that wraps an item to be packaged such as fresh food by the film 3 conveyed to the packaging device 7 and a packaging device 7 that is arranged in front of the packaging station 5 above the weighing-in device 2. And a sealing device 8 for heat-sealing the film 3 folded on the bottom side of the packaged item. On the other hand, on one side of the upper surface of the main body 1a, a console box 9 having a display 9a and an operating portion 9b is provided, and the operation of each of the devices 2, 6, 7, 8 is controlled by a built-in control unit. Is controlled, and the price of the packaged item is calculated based on the signal indicating the weight of the packaged item measured by the weighing-in / carrying-in device 2.
Further, on the other side of the upper surface of the main body 1a, there is provided a label printer 10 for printing the weight, price, etc. of the packaged product on a label based on the output signal from the console box 9 and a label issuing machine 11 integrated therewith. It is arranged.

Here, the structure of the film supply device 6 will be described. The supply device 6 is disposed above the film roll 3a rotatably supported by the roll support device 4 as shown in FIGS. The basic construction is a film feeding mechanism 12 which is provided to feed the film 3 while capturing it, and a film feeding mechanism 13 which feeds the film 3 fed by the feeding mechanism 12 toward the packaging station 5.

The film transport mechanism 13 includes a movable transport unit 14 that transports while holding one side edge (the right side edge in FIG. 3) of the film 3 and the other side edge of the film 3 ( It has a fixed-side transfer unit 15 for transferring while sandwiching the left side edge in FIG. Of these, the frame 14a of the movable side transport unit 14
A pair of slide members 17, 17 are fixedly mounted on the lower surface of the mounting brackets 16, 16 via a mounting bracket 16, and each of these slide members 17, 17 is provided with a pair of screw shafts 18 rotatably supported by the main body 1a. , 18 and each screw shaft 18,
Sprocket 19, 19 fixed to one end of 18 and drive motor 2
A sprocket 21 fixed to the end of the 0 rotation shaft is connected via a chain 22. Then, by rotating the screw shafts 18, 18 in the respective predetermined directions by the drive motor 20, the pair of slide members 17, 17 slide along the screw shafts 18, 18, whereby the movable-side conveyance The entire unit 14 is moved in the axial direction of the screw shafts 18, 18 so that the distance between the movable side transfer unit 14 and the fixed side transfer unit 15 can be adjusted appropriately. ing. On the other hand, the fixed-side transfer unit 15 is fixed to the main body 1a side while being supported by the ends of the screw shafts 18 and 18.

Here, the fixed-side transport unit 15 and the movable-side transport unit 14 have the same configuration, respectively. Therefore, the configuration of the movable-side transport unit 14 will be described, and the configuration of the fixed-side transport unit 15 will be described. Is omitted. That is, as shown in FIG. 2, the movable side transport unit 14 has a direction in which the film 3 is transported between a pair of timing pulleys 23, 23 rotatably supported on both sides of the upper portion of the frame 14a (in the figure, An upper conveyor belt 24, which is a timing belt, is stretched along the (indicated by arrow A), and the upper conveyor belt is also interposed between a pair of timing pulleys 25, 25 rotatably supported on both sides of the frame 14a. Below the belt 24, a lower conveyor belt 26, which is a timing belt, is stretched in parallel with the belt 24. The timing pulley 25 located on the left side in FIG. 2 is driven by a belt carrying motor 27a such as a pulse motor. By operating this belt carrying motor 27a in the counterclockwise direction, the lower carrying belt 25 is carried. The film 3 sandwiched between the belt 26 and the upper transport belt 24 is transported toward the packaging station 5.
A plurality of clamp members 28 ... 28 are arranged below the lower conveyor belt 26 along the stretching direction, and each clamp member 28 is swingably supported by the frame 14a. The swing levers 29 are mounted on the upper portions of the swing levers 29 ... 29, and a pair of bar members 30 and 30 are supported on the lower ends of the swing levers 29. One end of each bar member 30 and 30 is a frame. Solenoids 31 and 31 arranged at predetermined positions of 14a
Are connected to each other via connecting levers 32, 32.
Then, as shown in the drawing, each clamp member 28 pushes up the lower conveyor belt 26 to bring the conveyor belt 26 into close contact with the upper conveyor belt 24, and then the solenoid is released.
By driving 31,31, the bar members 30 ... 30 move in the feeding direction of the film 3 (counter arrow A direction) via the connecting levers 32, 32, and accordingly, the swing levers 29 ... 29 swings in a predetermined direction, so that each clamp member 28 ... 28
The unclamped state can be set apart from the lower conveyor belt 26. Further, in the clamped state in which the lower conveyor belt 26 is in close contact with the upper conveyor belt 24 as described above, one side edge of the film 3 is reliably sandwiched between the two conveyor belts 24, 26. . The lower conveyor belt 26 in the fixed conveyor unit 15 having the same structure as the movable conveyor unit 14
Is also driven by another belt transport motor 27b, and the other side edge of the film 3 is held by the transport belt 26 and the upper transport belt 24.

On the other hand, the film delivery mechanism 12 located at the end of the film transport mechanism 13 on the film introduction side is driven by a film delivery motor 33 and a pair of delivery rollers that deliver the film 3 while capturing the film 3 from the film roll 3a. 34 and 35 are provided, and at the upper position thereof, a spindle 36 is provided on one side of the film transport mechanism 13 on the main body 1a side.
Of the pressing roller 37, which is rotatably supported between the state shown by the solid line and the state shown by the chain line, and which holds the film 3 between the feeding roller 35 and the lower conveying belt 26. A film carry-in unit 39 having a carry-in belt 38 for sandwiching the film 3 therebetween is arranged. The cutter solenoid 4 is provided between the feeding rollers 34 and 35.
A cutter 41 is formed which is driven by 0 to form a perforation in the width direction of the film 3, and below the carry-in belt 38 in the carry-in unit 39, is driven by a clamp solenoid 42 to form a carry-in belt 38. Clamping member 43 for clamping both side edges in the width direction of the film 3 between
Is provided. Further, the carry-in belt 38 is attached to the frame of the carry-in unit 39 so as to be vertically movable via a spring (not shown), and the carry-in unit 39 is rotated upward as shown by a chain line in FIG. Belt 38
In the floating state, the end portion of the film 3 pulled out from the film roll 3a is guided onto the pair of feeding rollers 34, 35, and the carry-in unit 39 is rotated to move the pressing roller 37 as shown by the solid line. By bringing the feeding roller 35 into contact with the feeding roller 35, the end portion of the film 3 is conveyed so that both conveying units 1
It will be delivered to 4,15.

Then, as shown in FIG.
Movable side transport unit 14 and fixed side transport unit
Film 3 transported to packaging station 5 by 15
A lifter device 44, which receives a packaged product Y such as fresh food stored in a tray X from the weighing-in device 2 and pushes it up to the packaging station 5, is provided below the table. On the upper part, a packaging device 7 for packaging the above-mentioned article to be packaged Y with the film 3 together with the tray X.
The weighing-in / carrying-out device 2 is supported by a weighing machine 45 for weighing the weight of the articles to be packaged Y stored in the tray X, and a bracket 46 attached to the upper surface of the weighing machine 45. 48 has a plurality of carrying-in belts 48 stretched between a pair of rollers 47, 47, and each carrying-in belt 48 is provided with a protrusion 48a for pressing the end portion of the tray X and carrying it to the lifter device 44 side. By mounting the articles to be packaged Y stored in the tray X on the respective carry-in belts 48 ... 48 which are fixedly mounted, the weight of the articles to be packaged Y is measured by the measuring device 45, and Tray X is projected 48a as drive belt 48 is driven.
It is pushed by and is conveyed to the lifter device 44 side. And this lifter device 44 is
A plurality of support bars 50 ... 50 erected on the 49 and each support bar
50 has support members 51 ... 51 that are rotatably supported at the upper ends of the trays 50 and that support the bottom surface of the tray X, and the base 49 has a main body 1a of the main body 1a as shown in FIG. The upper part of each of the support members 51 ... 51 is moved up and down by a predetermined stroke through a link mechanism 53 and the like which is arranged below the side part and is moved up and down by a cam member 52 which is rotated by a driving means (not shown). The tray X supported by the
It is designed to be pushed up from below,
While the film 3 adheres to the upper surface of the article to be packaged Y,
Both side edges of the film 3 in the width direction are movable side transport units 14
And the transfer belts 24, 2 in the fixed-side transfer unit 15
It is clamped between 6; 24 and 26 so that the film 3 is held in a stretched state in the width direction.

The to-be-packaged product Y is packaged together with the tray X by the packaging device 7 by the film 3 stretched as described above. As shown in FIGS. In addition, the timing belt 5 stretched between the pair of timing pulleys 54a and 54b supported on one side of the rear portion of the main body 1a.
5 and a pair of timing pulleys 56a, 5 supported on the opposite side.
Another timing belt 57 stretched between 6b, and a pair of left and right folding plates 60, 61 supported below the respective timing belts 55, 57 via support brackets 58, 59,
A timing belt stretched between a pair of timing pulleys 62a, 62b supported at predetermined positions of the main body 1a in a direction orthogonal to the transport direction of the film 3 (width direction of the film 3).
63, a folding plate 65 supported below the belt 63 via a support bracket 64, and the timing pulleys 62a, 62b.
A timing belt 67 stretched between a pair of timing pulleys 66a, 66b arranged to face each other,
A discharge pusher 69 supported below the timing belt 67 via a support bracket 68 is provided. Then, the timing pulley 54b and the timing pulley 56a are interlocked by a pair of gear members 70a, 70b, and the timing pulley 54a is driven by the drive motor 71, so that both timing belts 55, 57 are in opposite directions. The pair of left and right folding plates 60, 61 will be moved to
As shown by the arrow B in FIG. 4, they are moved in the directions in which they come in contact with each other. Further, the timing pulleys 62c and 6c coaxially supported by the timing pulleys 62b and 66b are also provided.
By driving 6c by the drive motors 72 and 73, respectively, the folding plate 65 and the discharge pusher 69 are moved in the width direction of the film 3 as shown by an arrow C in FIG. ing. And each of the above folding plates 6
As shown by the chain line in FIG. 3, the peripheral portion of the stretched film 3 is folded by the 0, 61, 65 onto the bottom side of the tray X in which the article to be packaged Y is housed, and is wrapped by the film 3. The packaged product Y thus pushed is pushed forward by a discharge pusher 69 which is advanced at a timing later than the folding plate 65, and the packaged product Y is arranged at the front position of the packaging station 5 with a sealing device. It is designed to be pushed out toward 8. The film 3 folded on the bottom surface side of the tray X pushed onto the sealing device 8 is heat-sealed.

It should be noted that, as shown in FIGS. 1 and 3, a pair of pressing members 7 for contacting the upper surface of the article to be packaged Y and preventing the article to be packaged Y from rising above the packaging station 5.
4,74 are rotatably supported.

Next, the control system of the film supply device 6 in the present embodiment will be explained. As shown in FIG. 5, this control system includes a film feeding motor 33 in the film feeding mechanism 12 and a pair in the film transport mechanism 13. The belt 3 conveys the film 3 between the belt conveying motors 27a and 27b, the cutter solenoid 40 which operates the perforation forming cutter 41, and the carry-in belt 38 in the film carry-in unit 39 on the downstream side of both the feeding rollers 34 and 35. It has a control unit 75 for controlling the clamp solenoid 42 for operating the clamp member 43 for clamping.
The control unit 75 inputs the interlocking signal a from the control unit 76 in the console box 9 shown in FIG. 1, and the film feeding motor is driven in accordance with a predetermined timing preset based on the interlocking signal a.
Film feeding signal b to 33 and each belt transport motor
Belt conveying signals c and c for 27a and 27b, a cutter actuation signal d for the cutter solenoid 40, and a clamp signal e for the clamp solenoid 42 are output respectively.

Next, the operation of this embodiment will be described with reference to the time chart of FIG.

That is, when the control unit 75 receives the interlocking signal a from the control unit 76, it is shown in FIG.
As shown in (c), first, the film feeding signal b and the belt conveying signals c, c are simultaneously output. Therefore, the film feeding motor 33 starts to operate and the film feeding mechanism described above is started.
The pair of delivery rollers 34 and 35 in 12 are rotated to deliver the film 3 from the film roll 3a supported by the roll support device 4 and convey the leading end thereof to the film transport mechanism 13 located on the downstream side. At the same time, both belt transport motors 27a, 27b also start operating to move the lower transport belts 26, 26 of the movable transport unit 14 and the fixed transport unit 15 in the film transport mechanism 13 in synchronization. As a result, the both side edges of the leading edge of the film 3 sent from the film feeding mechanism 12 enter between the opposing upper transport belts 24, 24 and are held between the two belts 24, 26; 24, 26. At the same time, it is transferred to the transfer station 5 in that state. Then, when a predetermined time elapses and time t ₁ is reached, the control unit 75 stops sending the film feeding signal b as shown in (b) and (c) of the figure, and then at time t ₂ (t ₂ >). When t ₁ ) is reached, the transmission of the belt conveyance signals c, c is stopped. As a result, after a while after the film feeding rollers 34 and 35 are stopped, the transport operations of the movable side transport unit 14 and the fixed side transport unit 15 are both stopped, and the film 3a fed from the film roll 3a is stopped. However, it is held in a state of being tense in the longitudinal direction on the downstream side of the feeding roller 34 located on the upstream side. With the film 3 thus tensioned, the sixth
As shown in FIG. 7D, the cutter operating signal d is output from the control unit 75 to the cutter solenoid 40, so that the cutter solenoid 40 is actuated to move the cutter 41 upward.
Perforations are formed on the film 3 at the position P ₁ . At that time, since the film 3 is tensioned in the longitudinal direction, perforations are easily formed. After that, the sending of the cutter actuation signal d is stopped and the cutter 41, which has been moving upward, moves downward and returns to the initial position.

At a time t ₃ after the lowering of the cutter 41, as shown in FIGS.
27a, a belt carrier signal c for 27b, c is output first, in a subsequent time t ₄ when a while elapsed, the film feeding motor
The film feeding signal b for 33 is output. Therefore, first, the transport operation of the fixed-side transport unit 15 and the movable-side transport unit 14 in the belt transport mechanism 13 is restarted, the film 3 starts moving toward the packaging station 5, and then the film feeding mechanism 12 is started.
The feeding rollers 34 and 35 in 1 restart the feeding operation of the film, whereby the film 3 is conveyed again to the packaging station 5 while maintaining the tension state. Then, after that state continues for a while, time t ₅
Then, as shown in FIG. 7E, a clamp signal e is output to the clamp solenoid 42, whereby the clamp member 43 moves upward and the film 3 is clamped. At this time, as shown in FIG.
The perforation formed by 41 has reached the position of P ₂ immediately downstream of the clamp member 43 from the position of P ₁ . At this point in time, as shown in FIG. 6 (c), since the belt conveyance signals c, c to both the belt conveyance motors 27a, 27b continue to be sent out, the film 3 is cut from the perforations, and the film 3 is cut to a predetermined length. The length of the film 3 is conveyed to the packaging station 5 while maintaining the tension in the longitudinal direction.

Therefore, in the packaging station 5, the film 3 is held in a vertically and horizontally tense state, and the finished product after packaging becomes good.

In the present embodiment, the relationship between the rotation speeds of the film feeding motor 33 and the two belt feeding motors 27a and 27b is set so that the feeding speed of the film feeding mechanism 13 is slightly higher than the feeding speed of the film feeding mechanism 12. Has been done.

In this embodiment, the timing of the stopping operation of the film 3 at the time of forming the perforations and the timing of starting the next transport operation are made different, but either one of them may be made different.

As described above, according to the present invention, when the film feeding mechanism restarts the feeding operation after the film feeding is interrupted to insert the perforations for cutting into the film, Since the tension force in the longitudinal direction acts, the tension state is conveyed to the packaging station 5 while being maintained even after the film is cut. As a result, the film is held in the packaging station 5 in a state where the film is tensioned in the vertical and horizontal directions.
Good finish after packaging. Moreover, since it is a simple structure for varying the operation timings of the film transport mechanism and the film feeding roller in the process of interrupting the film supply operation in order to form perforations for cutting on the film, this type of packaging There is an advantage that the manufacturing cost of the machine can be reduced. Moreover, in the structure in which the control means shifts the operation timings of the first and second drive means to tension the film, the operation timings of the first and second drive means can be easily changed. By making such a change, it becomes possible to easily adjust the tension of the film. Therefore, even if the tension of the film varies depending on conditions such as the material and thickness of the film or the temperature and humidity, it is possible to change the operation timing of the first and second drive means. It is possible to easily and easily adjust the tension so that it is in an optimal state, and fine adjustment is possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a front view of a packaging machine equipped with a film supply device according to this embodiment,
FIG. 2 is an enlarged cross-sectional view showing the structure of the film supply device and its periphery, FIG. 3 is an enlarged cross-sectional view of an essential part taken along the section line III-III in FIG. 1, and FIG. 4 is shown in FIG. IV-IV is a cross-sectional view of the main part showing the structure of the packaging device taken along the section line IV, and FIG.
FIG. 6 is a time chart showing the operation of the film supply apparatus, and FIG. 7 is an explanatory view of the operation of this embodiment. 1 ... Packing machine, 3 ... Film, 3a ... Film roll, 5 ... Packing station, 6 ... Film supply device, 12 ... Film feeding mechanism, 13 ... Film transport mechanism, 14 ... Movable side transport Units, 15 ... Fixed side transport unit, 27a, 27b ... Belt transport motor (second drive means), 33 ... Film feeding motor (first drive means), 34
...... Film feeding roller, 41 …… Cutter (perforation forming means), 75 …… Control unit (control means).

Claims (1)

[Scope of utility model registration request] 1. A packaging roller which is driven by a first driving means to feed a film from a film roll while capturing the film, and a packaging material which is driven by a second driving means and which holds both side edges of the film fed by the feeding roller. A packaging machine provided with a film transport mechanism for transporting to a station, and a perforation forming means which is disposed between the film transport mechanism and the feeding roller and forms perforations for cutting in the width direction of the film. In addition to stopping the film supply operation when the perforation forming means is activated, the first drive means is stopped and the second drive means is activated at least at one of the stop and the start of the next supply. The first and second driving hands so that the film is tensioned in the longitudinal direction on the downstream side of the feeding roll. Packaging machine the film supply control apparatus characterized by comprising a control means for actuating by shifting the timing.