JP2549100Y2 - Film supply device in packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a film supply device in a packaging apparatus for stretch-packaging a packaged product such as a fresh food product with a polyethylene film, for example.

(Prior Art) In general, there is known a stretch packaging machine for packaging articles such as fresh food items stored in a polystyrene foam tray with a polyethylene stretch film together with the tray. This type of wrapping machine is generally provided with a roll support mechanism for rotatably supporting a film roll on which a stretch film having a predetermined width is wound in multiple layers, and at both side positions in the width direction of the stretch film. A pair of film transport mechanisms for nipping both sides of the stretched film cut to a predetermined length and transporting the stretched film to the packaging unit, and pushing up the articles stored in the tray from below the stretched film held tight in the packaging unit It is composed of a lifter mechanism and a packaging mechanism that wraps the periphery of the stretch film on the bottom side of the tray pushed up by the lifter mechanism and wraps it.

By the way, when the articles are stretch-wrapped together with the tray by using the above-described packaging machine, the size of the articles stored in the tray, in other words, the size of the tray corresponding to the size of the tray is suitable for each tray size. A film roll having a predetermined width is selectively used.

Further, when the film roll is exchanged according to the tray dimensions as described above, a pair of film transport mechanisms for nipping the both sides in the width direction of the film and transporting the film to the packaging unit accordingly. At least one of
The film is moved in the width direction in accordance with the width of the film. For example, according to a conveying device for a packaging film and the like described in JP-A-57-194915, a plurality of endless transport belts for transporting the film while nipping one side in the width direction of the packaging film. Supports the moving frame stretched in parallel up and down so that it can be moved in the film width direction. By operating the operation bar attached to this moving frame manually, it corresponds to the width dimension of the film that uses the moving frame. And can be moved in the width direction.

(Problems to be Solved by the Invention) By the way, when the film roll is exchanged according to the tray dimensions as described above, each time the interval between the pair of film transport mechanisms is set to the interval corresponding to the film width. In order to achieve this, it is necessary to manually operate at least one of the film transport mechanisms to move the film in the film width direction to adjust the position thereof, and this adjustment work is cumbersome and troublesome.

On the other hand, prior to adjusting the distance between the pair of film transport mechanisms as described above, when exchanging the film roll, conventionally, both of the film holders supporting both ends of the film roll, or at least one of the positions thereof Has to be adjusted according to the width of the film roll to be replaced, and the adjustment work is cumbersome and troublesome. As described above, in the related art, in addition to the inconvenience at the time of replacing the film roll, it is necessary to adjust the interval of the film transport mechanism more troublesome, and therefore, when replacing the film roll in accordance with the tray size. It took a long time for a series of setup change work, and the workability was significantly reduced.

The present invention addresses the above-described circumstances, and in a packaging device that stretch-wraps a packaged product such as a fresh food product with a film, exchange of the roll of the film and adjustment of the distance between a pair of film transport mechanisms accompanying the roll exchange. It is an object of the present invention to provide a film supply device that can be performed extremely easily, thereby improving the workability thereof.

(Means for Solving the Problems) In order to solve the above problems, the present invention is characterized in that it is configured as follows.

First, a device according to the first claim of the present application (hereinafter, referred to as a first device) is to push up an article to be packaged from below a film held in tension at a packaging station and to attach a peripheral portion of the film to the article to be packaged. What is claimed is: 1. A film supply device in a packaging device, which folds and wraps a film on a bottom surface thereof, comprising: a roll support mechanism for rotatably supporting a roll of the film; Having a pair of transport units that individually pinch and transport both side portions in the width direction of the film,
Among these transport units, at least one of the transport units is movable so that the distance between the transport unit and the other transport unit can be adjusted, and a detecting means for detecting a set position of the film roll set on the roll support mechanism is provided. And a drive unit for driving at least one of the transport units so that both units of the film transport mechanism are located at the sandwiching positions corresponding to the respective sides in the width direction of the film based on the detection result by the detection unit. It is characterized by having.

The invention according to the second claim of the present application (hereinafter, referred to as the second invention) is to push up the wrapped product from below the film held in tension at the packaging station and to attach the peripheral edge of the film to the wrapped product. What is claimed is: 1. A film supply device at a packaging position where the film is folded and packaged on a bottom surface side, wherein a roll support mechanism rotatably supports the film roll, and a film transport mechanism that transports the film unreeled from the support mechanism to the packaging station. Having a pair of transport units that individually pinch and transport both side portions in the width direction of the film,
Among these transport units, at least one of the transport units is movable so that the distance between the transport unit and the other transport unit can be adjusted, and detection means for detecting the roll width of the film roll set on the roll support mechanism is provided. And a drive unit for driving at least one of the transport units based on the detection result by the detection unit so that the interval between the two units in the film transport mechanism becomes an interval corresponding to the film width.

The invention according to the third claim of the present application (hereinafter, referred to as a third invention) is to push up the packaged article from below the film held in tension at the packaging station and to attach the peripheral edge of the film to the packaged article. In the film supply device in the packaging device that folds and wraps the bottom surface side, a roll support mechanism that rotatably supports the roll of the film, and is cut out to a predetermined length according to an article to be packaged by being unreeled from the support mechanism. A film transport mechanism for transporting a film to the packaging station, and the roll support mechanism, a roll bar supporting a roll, a fixed holder provided on the roll bar, and movable on the roll bar. And a movable holder that clamps both ends of the roll between the fixed holder and the film transport mechanism. A fixed-side transport unit for nipping and transporting one side of the film, and a transport for nipping and transporting the other side in the width direction of the film and adjusting the distance between the fixed-side transport unit and the fixed-side transport unit. And a movable side transport unit that is made possible, and according to the position of the movable holder in the roll support mechanism, the movable side so that the interval between both units in the film transport mechanism becomes an interval corresponding to the film width. Driving means for driving the transport unit is provided.

The invention according to a fourth aspect of the present invention (hereinafter referred to as a fourth invention) is characterized in that, in any of the first to third inventions, a roll supporting mechanism for rotatably supporting the film roll is provided by packaging. A roll bar for supporting the roll, which is supported in a cantilever manner on the apparatus main body side, a fixed holder provided at the distal end of the roll bar, and a fixed holder movably supported on the base end side of the roll bar. A movable holder that sandwiches both ends of the roll between the movable holder and an elastic member that urges the movable holder in a direction to approach the fixed holder, and has a diameter that allows the fixed holder to pass through a roll of film. And a locking means for projecting radially outward from the fixed holder after the roll is inserted through the holder and locking one end of the roll.

(Operation) According to the first invention, the film nipping position of the film transport mechanism is automatically adjusted based on the setting position of the film roll with respect to the roll support mechanism. According to the second invention,
Since the film sandwiching interval of the film transport mechanism is automatically adjusted based on the roll width of the film roll set in the roll support mechanism, in any of the inventions, the positioning operation of the film transport mechanism accompanying the exchange of the film roll is unnecessary. Become.

According to the third aspect of the present invention, both ends of the roll are held between a fixed holder provided on the roll bar and movable on the roll in a roll supporting mechanism for rotatably supporting the roll of film. In accordance with the position of the movable holder, the movable transport unit constituting the film transport mechanism is driven by the driving unit, so that the interval between the movable transport unit and the fixed transport unit becomes the interval corresponding to the film width. This automatically eliminates the need to adjust the interval between the two units in the film transport mechanism each time the roll is changed, as in the related art.

Further, according to the fourth invention, the fixed holder provided at the tip of the roll bar supported in a cantilever manner in the roll supporting mechanism has a diameter capable of inserting a roll of film, and the roll is inserted into the fixed holder. After that, locking means for projecting radially outward from the fixed holder to lock one end of the roll are provided, and the movable holder is movable on the roll bar, so that the roll is fixed. By being inserted from the holder side, the movable holder is pressed by the end of the roll and moves on the roll bar according to the roll width against the elastic member, and after the roll is inserted, the other end of the roll is inserted. The ends are locked by locking means provided on the fixed holder, so that the roll is always in contact with the fixed holder regardless of the roll width of the roll to be mounted. Together is reliably supported in a state of being sandwiched between the movable holder, the roll will be its one end is precisely maintained at a predetermined set position positioned by the locking means. Further, the roll can be easily removed simply by releasing the locked state of the roll end by the locking means. As described above, according to the fourth invention, the roll can be held in the mounted state only by inserting the roll of the film from the fixed holder side, and when the roll is replaced, the roll is provided on the fixed holder. The roll can be easily removed simply by releasing the locked state of the roll end by the locking means, thereby making it possible to replace the film roll very easily.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the packaging device 1 has a main body 1a.
And a film roll 3a in which a weighing-in mechanism 2 provided at the center of the front and a stretch film 3 having a predetermined width, which is also provided on the side of the main body 1a, and wound in multiple layers.
And a roll support mechanism 4 that rotatably supports the film 3, and is formed in a main body 1 a located above the weigh-in / carry-in mechanism 2 by sandwiching both sides in the width direction of the film 3 unwound from the roll support mechanism 4. A film transport mechanism 6 (see FIG. 2) for transporting the product to the packaging station 5, and a folding mechanism 7 (see FIG. 2) for packaging a product to be packaged such as a fresh food product by the film 3 transported to the packaging station 5. When,
The weigh-in / carry-out mechanism 2 in front of the packaging station 5
And a sealing mechanism 8 for heat-sealing the film 3 folded on the bottom side of the article to be packaged, which is disposed on the upper side of the package and packaged by the folding mechanism 7. On the upper surface of the main body 1a, a display 9a and an operation unit 9b are provided, and the mechanisms 2,
A control device 9 for controlling the operations of 6, 7, 8 and calculating the price of the packaged product based on a signal indicating the weight of the packaged product measured by the weighing-in / carrying-in mechanism 2; A label printer 10 that prints the weight, price, and the like of an article to be packaged on a label based on an output signal from the device 9 and a label issuing machine 11 integrated with the label printer 10 are provided.

Next, the structure of the film transport device 6 will be described. As shown in FIGS. 2 and 3, the transport mechanism 6 is provided at one end of a film roll 3a rotatably supported by the roll support mechanism 4. (A left end in FIG. 2), a fixed-side transport unit that sandwiches one side of the film 3 fed from the film roll 3a and transports the film 3 toward the packaging station 5. 12 and the film roll 3a, which is disposed above the other end (the right end in FIG. 2) of the film roll 3a.
A movable side transport unit 13 for nipping the other side of the film 3 unreeled from 3a and transporting the film 3 toward the packaging station 5; And the movable side transfer unit
A pair of slide members 15, 15 is fixedly mounted on the lower surface of the frame 13a via mounting brackets 14, 14, and each of these slide members 15, 15 is rotatably supported by the main body 1a. The screw shafts 16, 16 are respectively screwed together, and the sprockets 17,
A sprocket 19 fixed to an end of a rotation shaft 18a of the drive motor 18 is connected to a sprocket 19 by a chain mechanism 20.
Then, by rotating each of the screw shafts 16 and 16 in a predetermined direction by the drive motor 18, the pair of slide members 15 and 15 slide along each of the screw shafts 16 and 16, thereby moving the movable side. The whole unit 13 has screw shafts 16,16
, The distance between the movable side transport unit 13 and the fixed side transport unit 12 can be appropriately adjusted. The fixed transfer unit 12 is fixed to the main body 1a while being supported by the ends of the screw shafts 16, 16.

However, if necessary, the fixed-side transport unit 12 is configured to be movable similarly to the movable-side transport unit 13, and the transport units 12, 13 on both sides can be moved according to the film setting position, or the transport unit 12 can be moved. , 13 may be finely adjusted to adjust the amount of grip on the side of the film.

The fixed-side transport unit 12 and the movable-side transport unit 13 have the same configuration, and therefore, the configuration of the movable-side transport unit 13 will be described, and the configuration of the fixed-side transport unit 12 will be described. Omitted. That is, as shown in FIG.
Is an upper conveyor belt 22 formed of a timing belt between a pair of timing pulleys 21 and 21 rotatably supported on both sides of an upper portion of the frame 13a along a conveying direction of the film 3 (indicated by an arrow A in the figure). And a lower portion formed of a timing belt in parallel with the belt 22 below the upper conveyor belt 22 between a pair of timing pulleys 23, 23 rotatably supported on both sides of the frame 13a. A transport belt 24 is stretched. Below the lower conveyor belt 24, a plurality of clamp members 25 are arranged along the direction in which the lower conveyor belt 24 is stretched, and each of the clamp members 25 is swingably supported by the frame 13a. At the upper end of each of the plurality of swing levers 26, a bar member 27 is supported at the lower end of each of the swing levers 26. One end of each of the bar members 27, 27 is connected to the frame 13a.
Connecting lever 2 to solenoids 28, 28
They are connected via 9,29 respectively. Then, as shown in the drawing, the lower conveying belt 24 is pushed up by each clamp member 25, and the solenoids 28, 28 are driven from the clamp state in which the conveying belt 24 is brought into close contact with the upper conveying belt 22, thereby connecting each connection. The bar member 27, via the lever 29, 29,
27 moves in the direction opposite to the feed direction of the film 3 (the direction opposite to the arrow A), and accordingly, each swing lever 26 swings in a predetermined direction. A non-clamped state separated from the lower transport belt 24 can be achieved. Further, in the clamped state in which the lower transport belt 24 is in close contact with the upper transport belt 22 as described above, the film 3 is securely held between the two transport belts 22 and 24, and the film 3 is moved with the movement of the two belts 22 and 24. The film 3 cut to a predetermined size is transported to the transport station 5.

Further, one side of the movable side transport unit 13, that is,
At the end on the introduction side of the film 3, the film roll 3a
A pair of feed rollers 31, 32 rotated in a predetermined direction by a drive motor 30 for carrying the unreeled film 3 to the start ends of the upper and lower transport belts 22, 24; A spindle on one side of the body 1a
A pressing roller 34 rotatably supported between a state shown by a solid line and a state shown by a dashed line around 33, and sandwiching the film 3 between the feed roller 32 and the lower transport belt 24. A carry-in mechanism 36 provided with a carry-in belt 35 for holding the film 3 therebetween is provided. Further, a cutter 38 which is driven by a solenoid 37 to form a perforation in the width direction of the film 3 is provided between the feed rollers 31 and 32, and is provided below the carry-in belt 35 in the carry-in mechanism 36. Is provided with a clamp member 40 which is driven by a solenoid 39 and clamps both sides in the width direction of the film 3 with the carry-in belt 35. The carry-in belt 35 is attached to a frame of the carry-in mechanism 36 via a spring (not shown) so as to be vertically movable, and as shown by a chain line in FIG. With the 35 lifted, the end of the film 3 pulled out from the film roll 3a is guided onto a pair of feed rollers 31 and 32, and the loading mechanism 36 is rotated as shown by a solid line to press the pressing roller 34. When the film 3 is brought into contact with the feed roller 32, the end of the film 3 is conveyed and the end is transferred to the upper and lower conveyor belts 22 and 24. Then, the film 3 is fed out by a predetermined amount by the pair of feed rollers 31 and 32, and once the feeding of the film 3 is stopped. At this time, a perforation is formed in the width direction of the film 3 by the cutter 38. The film 3 is conveyed again, and both side portions in the width direction of the film 3 are clamped by the clamp member 40 in a state where the perforations formed by the cutter 38 are located immediately downstream of the clamp member 40. By driving each of the conveyor belts 22 and 24, the film 3 is cut from the perforation, whereby one side in the width direction of the film 3 cut to a predetermined length is brought into contact with each of the conveyor belts 22 and 24. It is conveyed to the packaging station 5 by being pinched between the 24. The other end of the film 3 is conveyed to the packaging station 5 by being pinched by the fixed-side transport unit 12 having the same configuration as the movable-side transport unit 13.

Then, as shown in FIG. 4, below the film 3 conveyed to the packaging station 5 by the fixed side conveyance unit 12 and the movable side conveyance unit 13 constituting the film conveyance mechanism 6, a tray (a) is provided. A lifter mechanism 50 that receives the stored packaged goods (b) such as fresh food products from the weighing-in / carrying-in mechanism 2 and pushes it up to the packaging station 5 is provided. 3, a folding mechanism 7 for wrapping the packaged product (b) together with the tray (a) is provided, and the weigh-in / carrying-in mechanism 2 is provided with the packaged product (b) stored in the tray (a).
And a pair of rollers 43, 4 supported by a bracket 42 attached to the upper surface of the weighing device 41.
A plurality of carry-in belts 44 ... 44 stretched between the three, and each carry-in belt 44 has a projection 44a for pressing the end of the tray (a) and carrying it to the lifter mechanism 50 side. The weight of the packaged product (b) is measured by the weighing device 41 by placing the packaged product (b) stored in the tray (b) on each of the carry-in belts 44. At the same time, the tray (a) is pressed by the projection 44a with the driving of the carry-in belt 44, and is conveyed to the lifter mechanism 50 side. The lifter mechanism 50 includes a support bar 53 rotatably supported by a plurality of brackets 52... 52 fixed on a base 51 and capable of falling, and an upper end of each support bar 53. And a support member 54 rotatably supported to receive the bottom surface of the tray (a). The base 51 is disposed below the side of the main body 1a as shown in FIG. The tray (a) which is raised and lowered by a predetermined stroke via a link mechanism 56 and the like which is raised and lowered by a cam member 55 rotated by a driving means (not shown), and which is supported on the upper part of each support member 54, As shown by the dashed line, the film 3
Is pushed up from below.
The film 3 is in close contact with the upper surface of the article to be packaged (b), and both side portions in the width direction of the film 3 are transport belts in the fixed side transport unit 12 and the movable side transport unit 13
The film 3 is clamped between 22 and 24 so that the film 3 is held in a stretched state.

As shown in FIG. 4, the support bar 53 of the lifter mechanism 50 is appropriately overturned according to the size of the tray (a), so that the support bar 53 and the other disposition parts when the base 51 is raised. To prevent interference.

Then, the packaged product (b) is folded together with the tray (b) by the folding mechanism 7 by the film 3 stretched as described above.
As shown in FIGS. 4 and 5, the folding mechanism 7 extends between the pair of timing pulleys 57a, 57b and 58a, 58b supported at the rear of the main body 1a. Provided timing belts 59, 60, and a pair of left and right folding plates 63, 64 supported below the timing belts 59, 60 via support brackets 61, 62.
A timing belt 66 stretched between a pair of timing pulleys 65a and 65b supported at predetermined positions of the main body 1a in a direction (width direction of the film 3) orthogonal to the transport direction of the film 3; The folding plate 68 supported via a support bracket 67 below the
A timing belt 70 stretched between a pair of timing pulleys 69a, 69b disposed so as to face the respective 65a, 65b, and a support bracket below the timing belt 70;
And a discharge pusher 72 supported via 71. The timing pulleys 57b and 58a are linked by a pair of gear members 73a and 73b, and the timing pulley 57a is driven by a drive motor 74,
The timing belts 59 and 60 are moved in opposite directions, and the pair of left and right folding plates 63 and 64
As shown by an arrow B in the figure, they are moved in a direction away from each other. In addition, each of the above timing pulleys
Timing pulleys 65c, 69c supported coaxially with 65b, 69b
Are driven by drive motors 75 and 76, respectively, so that the folding plate 68 and the discharge pusher 72
As shown by the arrow C in the figure, the film 3 is moved in the width direction. Then, as shown by chain lines in FIG. 4, the peripheral portions of the stretched film 3 are moved by the folding plates 63, 64, 68 into the tray (a) in which the packaged goods (b) are stored. A discharge pusher 72 that folds the packaged product (b) wrapped by the film 3 on the bottom surface side and advances at a timing later than the folding plate 68.
To push the packaged product (b) forward, and the sealing mechanism 8 disposed at the front position of the packaging station 5.
It is designed to extrude toward. Then, the film 3 folded on the bottom side of the tray (a) extruded onto the sealing mechanism 8 is heat-sealed.

As shown in FIGS. 1 and 4, a pair of upper parts of the packaging station 5 are provided on the upper part of the packaging article (b) to abut on the upper surface of the packaging article (b) to prevent the packaging article (b) from floating. The pressing members 77, 77 are rotatably supported.

In this embodiment, as shown in FIGS. 6 to 8, a roll support mechanism 4 for rotatably supporting the film roll 3 is rotatably mounted on a support bracket 78 fixed at a predetermined position of the main body 1a. Roll bar 79 cantilevered on
A fixed holder 80 fixed to the tip of the roll bar 79 and having a diameter that allows the film roll 3a to pass therethrough, and supporting one end of the film roll 3a; A large-diameter flange portion 81a movable between a position indicated by a solid line and a position indicated by a chain line in FIG. 6 according to the width of the film roll 3a and supporting the other end of the film roll 3a. Are fixedly mounted on the movable holder 81 integrally formed between the movable holder 81 and the pair of locking members 82, 82 fixed to the opposing surfaces of the movable holder 81 and the fixed holder 80, respectively. And a coil spring 83 approaching the side. Further, on the outer peripheral portion of the fixed holder 80, a plurality of leaf springs 84... 84 which are in contact with the inner peripheral surface of the core member 3b of the film roll 3a to prevent the film roll 3a from rotating are arranged. A stopper member 86 is provided which is urged by a leaf spring 85 and protrudes radially outward from the outer peripheral portion of the fixed holder 80 to lock the end of the core member 3b of the film roll 3a. . Thereby, as shown in FIG. 6, both ends of the core member 3b of the film roll 3a can be held between the fixed holder 80 and the movable holder 81 to hold the film roll 3a in the mounted state. Has become.

A brake drum 87 is integrally attached to an end of the roll bar 79 supported on the main body 1a side, and a lever 89 to which a brake shoe 88 slidingly contacting the drum 87 is fixed is turned. It is movably supported, and by rotating the lever 89 by a solenoid 90 disposed at a predetermined position of the main body 1a, the brake shoe 88 is pressed against the outer peripheral surface of the drum 87, The rotation of the roll bar 79 is restricted, and the film 3 is turned into the film roll 3a.
It is designed to prevent more than necessary feeding.

Further, in this embodiment, as shown in FIGS. 2 and 3, the movable transport unit 13 in the film transport mechanism 6 is moved in the width direction of the film 3 in accordance with the position of the movable holder 81 in the roll support mechanism 4. By moving, the distance between the movable-side transport unit 13 and the fixed-side transport unit 12 is adjusted to be equal to the width of the film 3. That is, the engaging member 91 that engages with the large-diameter flange portion 81a formed integrally with the movable holder 81.
A guide member 92 which is fixed and moves with the movement of the movable holder 81 when the film roll 3a is inserted is provided, and one side of the guide member 92 is provided with a mounting bracket 93 via a mounting bracket 93. A position detection sensor 94 for detecting the position of the movable transfer unit 13 is fixedly provided. On the other hand, a detection piece 96 is fixedly mounted at a predetermined position of the frame 13a in the movable side transport unit 13 via a mounting bracket 95, and the position of the detection piece 96 is detected by the position detection sensor 94. Accordingly, the position of the movable side transport unit 13 is adjusted with the movement of the movable holder 81 accompanying the replacement of the film roll 3a. That is, when replacing the film roll 3a, the drive motor
By rotating each of the screw shafts 16 and 16 in a predetermined direction by 18, the movable-side transport unit 13 is once retracted to the right side end from the state shown in FIG.
After the detection piece 96 fixed to 13 is separated from the position detection sensor 94, the detection piece 96 is moved to a predetermined position via the guide member 92 in conjunction with the movement of the movable holder 81 when the film roll 3a is inserted. By moving the movable side transport unit 13 forward again along each screw shaft 16, 16 until the detection piece 96 fixed to the movable side transport unit 13 is detected by the position detection sensor 94, the movable side The transport unit 13 is moved according to the width of the film 3.

Next, the operation of the present embodiment will be described.
When the film roll 3a is mounted, as shown in FIG. 6, by inserting the film roll 3a from the fixed holder 80 fixed to one end of the roll bar 79, the core member 3b of the roll 3a is inserted.
The movable holder 81 is pressed by one end of the film roll 3a and moves on a roll bar 79 according to the width of the film roll 3a against the coil spring 83, and after the film roll 3a is inserted, the roll 3a The other end of the core member 3b is locked by a stopper member 86 provided on the fixed holder 80, whereby the fixed holder 80 and the fixed holder
The film roll 3a is reliably supported between the movable holder 81 biased by the coil spring 83 toward the side 80, and the roll 3a can be held in the mounted state. Further, the film roll 3a can be easily removed from the roll bar 79 simply by releasing the locking state of the end of the core member 3b of the film roll 3a by the stopper member 86 by pressing the stopper member 86.
In this manner, the movable holder 81 moves on the roll bar 79 according to the width of the film roll 3a just by inserting the film roll 3a from the fixed holder 80 side, and the movable holder 81
The film roll 3a can be held in the mounted state between the film roll 3a and the fixed holder 80, and the film roll 3a
When removing the roll, simply release the locked state of the end of the core member 3b in the film roll 3a by the stopper member 86 provided on the fixed holder 80.
This makes it possible to remove the film roll 3a, so that the film roll 3a can be replaced very easily.

Further, in the present embodiment, when the film roll 3a is replaced, the position detection sensor 94 is moved to a predetermined position via the guide member 92 in conjunction with the movement of the movable holder 81 when the film roll 3a is inserted. In addition, according to the position of the position detection sensor 94, the movable-side transport unit 13 is moved along the pair of screw shafts 16, 16 by the drive motor 18, and the movable-side transport unit 13 and the fixed-side transport unit
12 is automatically adjusted so as to be an interval corresponding to the width of the film 3, so that each time the film roll 3a is replaced, each of the two transport units in the film transport mechanism 6 is changed. It is not necessary to adjust the intervals of 12,13.

However, the automatic positioning mechanism of the film transport mechanism 6 accompanying the exchange of the film roll 3a is not limited to this embodiment, and various other modes can be adopted.
For example, as shown in FIG. 9, a limit switch 100 is attached to the lower part of the movable side transport unit 13, and a contact 101 of the switch 100 is attached to one of the side ends of the movable holder 81 or the film roll 3a. It is configured to be able to contact. When the contact 101 swings over a predetermined width due to the exchange of the film roll 3a, the limit switch 1
The screw shaft 16 is rotated by a signal from 00 to move the movable side transport unit 13 in the direction of arrow D. During the movement, a new film roll 3a is held by the roll support mechanism 4
Set to. On the other hand, when the movable-side transport unit 13 is retracted to a predetermined position, the movable-side transport unit 13 is moved in the direction of arrow E by the reverse rotation of the screw shaft 16. When the contact 101 comes into contact with the newly set film roll 3a or the side end of the movable holder 81, the screw shaft 16 is stopped by a signal from the limit switch 100, and then the movable side transport unit 13 Is also stopped.
In this manner, the movable transport unit 13 is automatically positioned at a position corresponding to the up-down direction with respect to the right end of the film roll 3a.

FIG. 10 shows an example in which an optical sensor is used in place of the limit switch 100. As the optical sensor, various types such as a transmission type and a reflection type can be adopted. An example is shown in which a transmission type including a light receiving device and a light receiving device is adopted. That is, a vertical arm 102 is fixed to a lower portion of the movable side transport unit 13, a C-shaped arm 103 is fixed to a lower end thereof, and a light projecting device is provided at one end of the C-shaped arm 103 branched vertically. A light receiver 105 is attached to the other end of the film 104, and a beam emitted from the light projector 104 is input to the light receiver 105 across the set area of the film roll 3a.

And the transport unit 13 always has the movable holder 81
It stops at a position facing up and down. That is, the movable holder 81 is replaced with the replacement of the film roll 3a.
Moves in the direction of arrow E, and the movable holder 81
The beam interrupted by is detected by the light receiver 105, and the signal causes the screw shaft 16 to rotate.
Move in the direction of arrow E to track the movable holder 81. However, when the film roll 3a is not set in the roll support mechanism 4, the transport unit 13 stops before the movable holder 81 at the initial position. When a new film roll 3a is set, the beam is interrupted by the set film roll 3a.
Moves in the direction of arrow D. And the transport unit 13
However, when the beam passes through the set position of the movable holder 81 and the beam is detected again by the light receiver 105, the signal causes the screw shaft 16 to rotate in the reverse direction, and the transport unit 13 advances in the direction of arrow E. . Then, when the beam is again blocked by the movable holder 81, the screw shaft 16 stops at that point, whereby the transport unit 13 stops at a position vertically facing the movable holder 81.

On the other hand, when a reflective optical sensor is used, the surface of the roll bar 79 facing the optical sensor is formed as a reflective surface, and a movable side is provided at a boundary where reflected light from the roll bar 79 is no longer detected. The transport unit 13 may be stopped.

What has been described above is the film roll 3a set on the roll support mechanism 4 in order to automate the operation of positioning the transport unit when replacing the film roll.
The film nipping position of the film transport mechanism 4 (that is, the stop position of the transport unit 13) is automatically adjusted based on the setting position of the film transport mechanism 4. In addition, the film roll set in the roll support mechanism 4 By automatically adjusting the film nipping interval of the film transport mechanism 4 based on the roll width 3a, the positioning operation of the transport unit can be automated.

FIG. 11 shows the structure, in which a scale beam 106 is provided in parallel with the roll bar 79, and a bar code scale on the surface of which beam 106 has a reflection line and a non-reflection line repeated at a constant pitch. S is formed. On the other hand, a scanner 108 for detecting a vertical stripe reflection line is attached to an arm 107 extending from the side surface of the movable holder 81, and the scale S is arranged on the movement locus of the scanner 108. When the scanner 108 is located at the initial position, the scanner 108 is configured to be located at the entire reflection area 109 which is the start end of the scale S. When the film roll 3a is set on the roll support mechanism 4, the movable holder 81 moves in the direction of arrow D, and the scanner 108 scans the scale S with the movement, thereby outputting a pulse signal. The pulse signal is input to a counter (not shown), and is counted as the amount of movement of the movable holder 81. Then, the roll width of the set film roll 3a is calculated from the count value, the stop position of the movable transport unit 13 is calculated based on the calculated roll width, and the movement control of the transport unit 13 is performed. Thereby, the interval between the two transport units 12, 13 is adjusted to an optimal interval corresponding to the film width.

In the above embodiment, only the positioning adjustment of one transport unit 13 has been described.However, the other transport unit 12 is similarly configured to be movable, and the left end face of the film roll 3a and the transport unit 12 are connected to each other. However, it can also be adjusted to always correspond to the up and down.

(Effects of the Invention) As described above, according to the first and second inventions, the work of positioning the transport unit at the time of changing the film roll can be automated, so that the workability is improved and the transport unit is improved. There is an effect that the positioning can always be kept constant.

According to the third aspect of the present invention, the roll support mechanism rotatably supports the roll of film, and is movable on a roll bar to hold both ends of the roll between a fixed holder provided on the roll bar. In accordance with the position of the movable holder to be moved, the driving unit drives the movable transport unit constituting the film transport mechanism, and the gap between the movable transport unit and the fixed transport unit is supported by the roll support mechanism. The distance between the two units in the film transport mechanism must be adjusted each time the roll is changed, as in the conventional case, so that the distance is adjusted automatically to the distance corresponding to the film width. Workability is improved.

According to the fourth invention, the movable holder moves on the roll bar according to the roll width only by inserting the roll of film from the fixed holder side, and the roll is mounted between the movable holder and the fixed holder. It can be held in the state, when replacing the roll as before,
Each time, it becomes unnecessary to adjust the position of the roll holder that supports both ends of the roll according to the roll width. In particular, the above-mentioned roll is locked by the locking means provided on the fixed holder and protruding outward in the radial direction by urging the movable member toward the fixed holder by the elastic member. Regardless of which, the roll is always reliably supported while being sandwiched between the fixed holder and the movable holder, and the roll is accurately supported at a predetermined set position where one end thereof is positioned by the locking means. Will be. When replacing the roll, the roll can be easily removed simply by releasing the locked state of the end of the roll by the locking means provided on the fixed holder, thereby making it extremely easy to remove the film. The roll can be replaced, and workability at the time of replacing the roll can be further improved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, FIG. 1 is a front view of a packaging apparatus equipped with a film supply apparatus according to the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 3 is an enlarged sectional view showing the configuration of the film transport mechanism taken along the line III-III in FIG. 2, FIG. 4 is an enlarged sectional view showing a main part taken along the line IV-IV in FIG. 1, FIG. 5 is a sectional view of a main part showing the structure of the folding mechanism as viewed along the section line VV in FIG. 4, FIG. 6 is an enlarged longitudinal sectional view of the film supporting mechanism, and FIG. 7 is VII in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6 similarly. 9 to 11 are schematic structural diagrams of another embodiment. DESCRIPTION OF SYMBOLS 1 ... Packaging device, 3 ... Film, 3a ... Film roll, 4
... Roll support mechanism, 5 ... Packing station, 6 ... Film transport mechanism, 12 ... Fixed side transport unit, 13 ... Movable side transport unit, 15,16,18,20 ... Drive means (15 ... Slide member, 16 ... Screw shaft , 18 drive motor, 20 chain mechanism), 79 roll bar, 80 fixed holder, 81 movable holder, 83 elastic member (coil spring), 86 locking means (stopper member).

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-194915 (JP, A) JP-A-62-111255 (JP, A) Jikai 48-66849 (JP, U)

Claims (4)

(57) [Scope of request for utility model registration] 1. A film supply device in a packaging apparatus for pushing up an article to be packaged from below a film held in tension at a packaging station, and folding the peripheral portion of the film toward the bottom side of the article to be packaged, wherein: A support mechanism for rotatably supporting the film roll, and a film transport mechanism for transporting the film unreeled from the support mechanism to the packaging station, wherein the film transport mechanism has both side portions in the width direction of the film. And a pair of transport units for individually nipping and transporting, and among these transport units, at least one of the transport units is movable so as to be able to adjust an interval with the other transport unit. And detecting means for detecting the set position of the film roll set on the roll support mechanism. In addition, a drive unit for driving at least one of the transport units based on the detection result by the detection unit so that both units of the film transport mechanism are located at the clamping positions corresponding to each side in the width direction of the film is provided. A film supply device in a packaging device, which is characterized in that: 2. A film supply apparatus in a packaging apparatus for pushing up an article to be packaged from below a film held in tension at a packaging station, and folding the peripheral portion of the film to the bottom side of the article to be packaged, wherein: A support mechanism for rotatably supporting the film roll, and a film transport mechanism for transporting the film unreeled from the support mechanism to the packaging station, wherein the film transport mechanism has both side portions in the width direction of the film. And a pair of transport units for individually nipping and transporting, and among these transport units, at least one of the transport units is movable so as to be able to adjust an interval with the other transport unit. And detecting means for detecting the roll width of the film roll set in the roll supporting mechanism is provided. A driving unit for driving at least one of the transport units so that an interval between the two units in the film transport mechanism is an interval corresponding to a film width based on a detection result by the detection unit. Characteristic film supply device in packaging equipment. 3. A film supply device in a packaging device for pushing up a packaged product from below a film held in tension at a packaging station and folding the peripheral portion of the film toward the bottom surface side of the packaged product, wherein the film supply device includes: A support mechanism for rotatably supporting the roll of film, and a film transport mechanism for transporting the film fed from the support mechanism to the packaging station, wherein the roll support mechanism is a roll bar that supports the roll. A fixed holder provided on the roll bar, and a movable holder that is movable on the roll bar and sandwiches both ends of the roll between the fixed holder and the film transport mechanism. A fixed-side transport unit for nipping and transporting one side in the width direction of the film, and the other side also in the width direction of the film And a movable-side transfer unit that is movable so as to be able to adjust the distance between the fixed-side transfer unit and the fixed-side transfer unit, and according to the position of the movable holder in the roll support mechanism. And a drive unit for driving the movable-side transport unit such that the interval between the two units in the film transport mechanism is an interval corresponding to the film width. 4. A support mechanism for rotatably supporting a roll of film, comprising: a roll bar for supporting a roll, which is supported in a cantilever manner by a packaging device main body; and a fixed holder provided at a tip end of the roll bar. A movable holder movably supported on the base end side of the roll bar and sandwiching both ends of the roll between the fixed holder, and an elastic member for urging the movable holder in a direction to approach the fixed holder. And the fixed holder has a diameter capable of inserting a roll of film, and after the roll is inserted through the fixed holder, protrudes radially outward from the fixed holder to engage one end of the roll. The film supply device according to any one of claims 1 to 3, further comprising a locking means for stopping the film supply.