JPH0834415A - Film switching feeder in stretch film wrapping machine - Google Patents

Abstract

PURPOSE:To smoothly transfer film and enhance the efficiency of the wrapping operation by providing a control means by which a driving means is so controlled as to drive a specific film feeding unit at a lower speed than a predetermined film transfer speed synchronously with a film transfer device. CONSTITUTION:Film is set in the film standby positions of feeding parts 29a and 30a of a film switching feeder 8 at the time of film switching and its forward end is transferred to a film end detecting sensor located at a drawing guide part 16 of a film transfer device 3 at a lower speed than a predetermined film transfer speed of the film transfer device 3, thereby completing the low-spee film feeding operation. A gap between both the transfer mechanisms of the film transfer device 3 is adjusted according to the film width selected based on the dimension of an article. Accordingly, the film is accurately positioned in transfer after switching, the end part of the film is prevented from bending and a satisfactory film transfer and an efficient film wrapping operation are possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch film wrapping machine, and more particularly to a film switching and feeding device for selectively feeding a plurality of films to a film feeding device.

[0002]

2. Description of the Related Art Conventionally, in a film switching device of a stretch film wrapping machine disclosed in Japanese Unexamined Patent Publication No. 62-168832 (Citation 1), upper, middle and lower pull-in guide units integrated with each other are provided as sliders. On the other hand, it is rotatably supported in the vertical direction, and one of the pull-in guide units faces the film transport conveyor and is moved toward and away from each other by the reciprocating movement of the slider. Then, in a state where the drawing guiding unit is close to the film conveying conveyor, the leading end of the film is transferred from the drawing guiding unit to the conveyor and conveyed. In this film switching device, since it is necessary to rotate and reciprocate the drawing-in guide unit, not only the mechanism becomes complicated, but also the time required for film switching becomes long and the efficiency of the packaging work deteriorates.

On the other hand, in the switching device of the packaging paper feeding device disclosed in JP-A-61-183045 (Cited example 2), the packaging paper drawn from each roll into the upper box body and the lower box body is intermittently fed. It is inserted into one Y-shaped guide case via the, and one of the wrapping sheets is cut out at the exit of the Y-shaped guide case and carried out.

[0004]

In Cited Example 2, since the upper and lower boxes and the Y-shaped guide case are in fixed positions, the drawbacks of Cited Example 1 are eliminated. However, when the switching device of the second reference example is used for a stretch film that is extremely flexible and has self-adhesiveness unlike wrapping paper, the leading end portion of the film is bent and clogged in the Y-shaped guide case, so that the switching device transfers to the transport device. The leading edge of the film may not be delivered smoothly, which may reduce the efficiency of the packaging work.

[0007] Further, mainly at the time of automatic film switching, a structure is adopted in which the film is automatically selected by detecting the size of the article. In this case, even if the tray size is the same standard, A film having a width different from the optimum width when the detection value of the tray size varies before and after the size data of the tray, which is a switching condition, due to a dimensional error in manufacturing the tray, a detection error by the sensor, and the like. There is a risk that waste will occur in the film by selecting.

It is an object of the present invention to smoothly convey a film and to perform an efficient packing operation in a film switching / feeding device of a stretch film packing machine.

[0007]

A stretch film packaging machine according to the first invention and the second invention comprises a film transporting device, a film setting device, and a film switching device described below. The film transporting device has transporting mechanisms on both sides of the wrapping unit, and sandwiches the film carried in from the film pull-in guides of both transporting mechanisms and feeds it to the wrapping unit at a predetermined film transporting speed. The film setting device has
A plurality of film take-up rolls are attached. The film switching device has respective film feeding units for sandwiching and waiting the film front end pulled out from the film setting device, and selectively carries out the film front end to the film transport device.

Further, the packaging machine according to the first aspect of the present invention has the following structure as a film switching and feeding device. The article detection sensor detects the article size in the direction orthogonal to the film transport direction when the article is supplied to the packaging unit.

The gap adjusting means adjusts the gap between the two transport mechanisms of the film transport device. The control means positions the distance adjusting means in correspondence with the film width selected based on the article size detected by the input signal from the article detection sensor.

The film leading edge detection sensor detects the film leading edge at a film leading-out position in the pull-in guide portion of the film transporting device, which is separated from the film standby position in each of the film feeding units in the film feeding direction.

The drive means synchronously drives the film transport device and each film delivery unit of the film switching device. The film delivery determination means determines which of the film delivery units of the film switching device is to be driven.

The control means drives a specific film feeding unit of the film switching device selected based on the discrimination signal by the film feeding discrimination means at a speed lower than a predetermined film feeding speed in synchronization with the film feeding device. The drive means is controlled as described above.

The control means terminates the low speed driving in the film feeding unit of the film switching device based on the detection signal from the film front end detection sensor. Furthermore, the packaging machine of the second invention has the following configuration as a film switching / delivery device.

The drive means synchronously drives the film transport device and each film delivery unit of the film switching device. The optimum film width storage means stores the data about the film width when the data about the film width along the direction orthogonal to the film transport direction is input for each packaged article.

The set film width detecting means recognizes each film width by automatically detecting input data or a set value regarding the width of each film attached to the film setting device or each set film width.

The used film discriminating means compares the optimum film width stored in the optimum film width storage means with each set film width detected by the set film width detecting means, and among the set film widths, the optimum film width or more is determined. And the particular film used with a set film width that is closest to this optimum film width.

The control means controls the drive means so as to drive the film feeding unit for the used film based on the discrimination signal by the used film discrimination means. The stretch film packaging machines according to the third invention, the fourth invention and the fifth invention each include the following film transport device, film setting device, and film switching device. The film transporting device has transporting mechanisms on both sides of the wrapping unit, and feeds the film carried in from the film pull-in guides of both transporting units to the wrapping unit. A first film winding roll and a second film winding roll are attached to the film setting device. The film switching device has an upper film feeding unit and a lower film feeding unit for sandwiching and waiting the film leading end pulled out from the film setting device,
These film front end portions are selectively carried out to the film pull-in guide portions of both transport mechanisms of the film transport device.

Further, the film switching / delivering device of the third invention is configured as follows. The film pull-in guide portions of both transport mechanisms of the film transport device have an upper belt wound around an upper pulley and a lower belt wound around a lower pulley, and the upper belt is wound from an end portion thereof. Also, the winding end of the lower belt is projected to the upstream side in the film transport direction.

The upper and lower film feeding units of the film switching device are fixedly arranged, and the first and second films are fixed between the lower placing roller and the lower placing roller, respectively. An upper nipping roller for nipping the tip portion, a plurality of peripheral grooves arranged in parallel in the axial direction of these upper and lower rollers at predetermined intervals, and a comb-toothed film arranged between the upper and lower rollers through the peripheral grooves. And a guide.

The film feeding surface between the upper and lower rollers of the upper film feeding unit and the film feeding surface between the upper and lower rollers of the lower film feeding unit are the film in the film feeding direction of the film feeding device. The comb teeth of the film guide guide are made to incline toward the pull-in guide portion, and the comb teeth of the film guide guide are projected between the upper and lower rollers in the film feeding direction toward the lower belt of the film pull-in guide portion through the circumferential groove inside the outer peripheral surface thereof. ing.

Further, the upper holding rollers of the upper and lower film feeding units are supported so as to be vertically openable and closable with respect to the lower loading roller. Further, the film switching / delivering device of the fourth invention is configured as follows.

The film pull-in guide portions of both transport mechanisms of the film transport device have an upper belt wound around an upper pulley and a lower belt wound around a lower pulley.

In the upper and lower film feeding units of the film switching device, the lower mounting roller and the lower mounting roller sandwich the leading end portions of the first and second films, respectively. Upper clamping roller, a plurality of circumferential grooves arranged in parallel in the axial direction of the upper and lower rollers at predetermined intervals, and a comb-teeth-shaped film guide guide disposed between the upper and lower rollers through the circumferential groove. Have

This film guide guide has an upper guide and a lower guide in which a plurality of comb teeth are arranged in parallel along a direction orthogonal to the film feeding direction. The comb teeth of the lower guide are projected between the upper and lower rollers in the film feeding direction toward the film pull-in guide portion of the film transporting device through the circumferential groove inside the outer peripheral surface thereof.

The comb teeth of the upper guide and the comb teeth of the lower guide are arranged so as to be displaced from each other in the direction orthogonal to the film feeding direction. Further, the film switching / delivering device of the fifth invention is configured as follows.

The film pull-in guide portions of both transport mechanisms of the film transport device have an upper belt wound around an upper pulley and a lower belt wound around a lower pulley.

In the upper and lower film feeding units of the film switching device, the lower loading roller and the lower loading roller sandwich the leading end portions of the first and second films, respectively. Upper clamping roller, a plurality of circumferential grooves arranged in parallel in the axial direction of the upper and lower rollers at predetermined intervals, and a comb-teeth-shaped film guide guide disposed between the upper and lower rollers through the circumferential groove. Each of the comb teeth of the film guide guide is projected between the upper and lower rollers in the film feeding direction toward the film pull-in guide portion of the film transport device through the peripheral groove inside the outer peripheral surface thereof.

The comb teeth of the film guide are arranged at intervals such that they can support at least the lower surfaces of the widthwise ends of the prescribed film along the direction orthogonal to the film feeding direction.

[0029]

In the film switching and feeding device according to the first aspect of the present invention, the film leading end portion set at the film standby position in the feeding portion of the film switching device at the time of film switching is lower than the predetermined film feeding speed by the film feeding device. Then, the film is conveyed to the film front end detection sensor in the pull-in guide portion of the film transport device, and the low-speed feed is completed. Further, the interval between both transport mechanisms of the film transport device is adjusted according to the film width selected based on the article size.

In the second invention, data about the optimum film width for each article is set according to the article dimensions (height and width). Further, even if the film having the optimum width set for each article does not exist in the set film of the film setting device, the width that is equal to or larger than the optimum film width and is the closest to the width of the film that is currently set. Select the film with.

In the third aspect of the invention, the upper film feeding unit tilts upward and the lower film feeding unit tilts downward, so that the space between them becomes wide. Further, the leading end portion of the film fed out from the comb teeth of the film guide guide is reliably drawn and guided to the film transport device.

According to the fourth aspect of the invention, even if the film is extremely flexible and has an adhesive property such as a stretch film, the upper and lower comb teeth alternately support the leading end of the film.

According to the fifth aspect of the invention, both ends of the film width direction are supported from below in accordance with the prescribed film width without changing the film placement width of each film feeding unit, and both ends of the film width direction hang down. Disappears.

[0034]

First, an outline of a stretch film packaging machine according to an embodiment of the present invention will be described with reference to FIGS.

For convenience of explanation, the upstream side of the article feeding device in the article feeding direction or the upstream side of the article unloading device in the article unloading direction is set to the rear side, and these downstream sides are set to the front side. In the following description, the upstream side in the film transport direction is the right side and the downstream side is the left side.

The packaging machine comprises an article supply device 1, an article cradle device 2, a film transport device 3, a film folding device 4, and an article unloading device 5. In the article receiving device 2 in the machine frame 6, the placing table 2a is provided so as to be able to move up and down. The article supply device 1 is disposed inside and outside the machine frame 6, and the inner end side thereof corresponds to the mounting table 2a of the article receiving device 2.
Then, the article 67 placed on the article supply apparatus 1 (with the contents stored in the tray) is transferred onto the placing table 2a of the article receiving apparatus 2 at the lowest position, and then the article placing apparatus 2a is used. The packaging section, which will be described later, is designed to be lifted.
An article detection sensor 1a, which is a photoelectric switch for detecting an article 67 being conveyed, is attached to the article supply apparatus 1. The film transport device 3 is provided above the article receiving device 2 at the upper end in the machine frame 6. The film folding device 4 is provided above the film transport device 3 and at the upper end of the machine frame 6. The film folding device 4 includes a front fixed folding member 4a, a rear movable folding member 4b, and left and right movable folding members 4c and 4d, and the front and rear movable folding members 4b are moved toward and away from the front fixed folding member 4a. The left and right movable folding members 4c and 4d, which are movable in the direction, and rotatably supported behind the rear movable folding member 4b, open and close each other in the left-right direction as the rear movable folding member 4b moves back and forth. It is like this. And each folding member 4a, 4
The packaging section S between b, 4c and 4d corresponds to above the film feeding position of the film transport device 3, and the article cradle device 2 is mounted between the packaging section S and the inner end side of the article feeding apparatus 1. Table 2
a moves up and down. The article unloading device 5 is provided on the machine frame 6 above the film folding device 4, and the unloading belt 5a is above the packaging section S.

As shown in FIG. 3, a film setting device 7 is provided on the lower right side of the film conveying device 3, and a film switching device corresponding to the right side of the film conveying device 3 above the film setting device 7. 8 are provided. In particular, this embodiment is an improvement of the film switching device 8 in connection with the film transport device 3 and the film setting device 7, which will be described in detail below.

Detailed description of the film transporting device 3 shown in FIGS. 1 and 3, 5 and 8 will be omitted, but as shown in FIG. 4, a fixed transporting mechanism 9 on the front side and a movable transporting mechanism 10 on the rear side are provided. And the rear movable transport mechanism 10 is supported on the left and right rotation guide shafts 11 and 12. When the guide shafts 11 and 12 rotate, the movable transfer mechanism 10 moves in the front-rear direction along the guide shafts 11 and 12, moves toward and away from the fixed transfer mechanism 10, and the transfer mechanisms 9 and 12. The distance N between 10 in the front-rear direction is changed. The guide shaft 12 on the right side is rotated by a space adjusting motor 13, and the rotation is transmitted to the guide shaft 11 on the left side by a chain or the like (not shown).

In both of the transport mechanisms 9 and 10, as shown in FIGS. 3 and 8, the upper flat belt 14 and the lower flat belt 1
5, the upper flat belt 14 is wound around the upper pulley 17 and the lower flat belt 15 is provided at the film pull-in guide portion 16 between the upper and lower flat belts 14 and 15 facing the film switching device 8. Is wound around the lower pulley 18. The rotation center 17a of the upper pulley 17 is closer to the film conveyance direction P than the rotation center 18a of the lower pulley 18.
Is displaced toward the downstream side by a distance L, and the winding end portion 1 of the lower flat belt 15 is lower than the winding end portion 14a of the upper flat belt 14.
5a projects upstream in the film transport direction P. Therefore, a step is formed between the winding end portions 14a and 15a, and the upper side of the winding end portion 14a of the upper flat belt 14 is open. Rotation drive shaft 1 near the left rotation guide shaft 11
The rotation of the film feed motor 20 as a drive means is transmitted to the drive shaft 9, and the rotation of the rotary drive shaft 19 causes the upper flat belt 1 to rotate.
4 and the lower flat belt 15 are transmitted.
The lower flat belt 15 is made of a material having a high adhesion to the film, and the upper flat belt 14 is made of a material having a low slip resistance against the film, that is, a material having no close contact.

In the film setting device 7, as shown in FIG. 3, an upper set shaft 21 and an upper tension lever 22, a lower set shaft 23 and a lower tension lever 24 are provided. The first film 26 from the inserted first film winding roll 25 is pulled out as an upper film to the upper film feeding unit 29, which will be described later, via the lower tension lever 24, and the second film is inserted into the upper set shaft 21. The second film 28 is drawn from the film winding roll 27 through the upper tension lever 22 to the lower film feeding unit 30 described later as a lower film.

The film switching device 8 comprises an upper film feeding unit 29 and a lower film feeding unit 30. 5 to 8 in each unit 29 and 30.
As shown in FIG. 3, a first fixed shaft 32, a cutter rotary shaft 33, a drive rotary shaft 34, and a second fixed shaft 35 are arranged side by side between both fixed plates 31 from the upstream side in the film transport direction P. A guide roller 36 is rotatably supported on the first fixed shaft 32. The surface of the guide roller 36 is plated with chrome or the like to increase the adhesion of the roller 36 to the films 26 and 28. Therefore, when the films 26 and 28 are pulled out from the film winding rolls 25 and 27 and placed on the film feeding units 29 and 30, if they are placed on the guide rollers 36, they can be easily set. A cutter 37 is attached to the cutter rotation shaft 33 so as to be integrally rotatable. A first lower placement roller 38 is attached to the drive rotation shaft 34 so as to be integrally rotatable. A second lower mounting roller 39 is attached to the second fixed shaft 35.
Is rotatably supported. These both mounting rollers 38,
A plurality of round belts 40 are stretched between 39.

A third fixed shaft 41 is installed above the second lower loading roller 39 and between the two fixed plates 31. Lid frame 4
Reference numeral 2 includes both arm plates 43 and a handle plate 44 connecting them, and both arm plates 43 are supported by both ends of the third fixed shaft 41 so as to be vertically rotatable. A fourth fixed shaft 45 is installed between the arm plates 43 between the third fixed shaft 41 and the handle plate 44. Between the two arm plates 43, the first upper holding roller 46 is rotatably supported by the third fixed shaft 41 and is in contact with the second lower mounting roller 39, and at the same time the fourth fixed shaft 45 is attached. On the other hand, the second upper nipping roller 47 is rotatably supported and contacts the first lower placing roller 38, and a plurality of round belts 48 are stretched between the nipping rollers 46 and 47. On the handle plate 44, a large number of comb teeth 49 are juxtaposed at predetermined intervals in the axial direction of the second upper nipping roller 47 and extend toward the same.

A lock rotation shaft 44a is installed between the fixed plates 31 near the handle plate 44 of the lid frame 42, and lock plates 44b are attached to both sides of the lock rotation shaft 44a. The operation knob 44c is attached to one side thereof. Then, with the lid frame 42 moved downward and closed,
The lock turning shaft 44a is turned by the operation knob 44c so that the lock plates 44b can be engaged with and disengaged from the lock pins 44e on the arm plates 43 of the lid frame 42 (lock mechanism).

Below the first lower placing roller 38, below the second lower placing roller 39 and the first upper holding roller 46.
Between the two fixing plates 31 above the first lower guide guide 50, the second lower guide guide 51 and the upper guide guide 52.
A plurality of comb teeth 50a, 51a, 52a are provided on these guides 50, 51, 52, respectively.
They are arranged in parallel at a predetermined interval in the axial direction of 9, 46, 47. The lower mounting rollers 38, 39 and the upper holding rollers 46, 47 have circumferential grooves 38a, 39a, 46a, respectively.
47a are juxtaposed in alignment with the respective comb teeth 50a, 51a, 52a. Each comb tooth 51a of the second lower guide 51 is bent between both lower placement rollers 38 and 39, and inside each outer groove 39a of the second lower placement roller 39 inside its outer peripheral surface. It is inserted and extends in the film feeding direction Q through between the second lower placing roller 39 and the first upper nipping roller 46. Each comb tooth 50a of the first lower guide roller 50 is bent between the first lower mounting roller 38 and the cutter rotating shaft 33 so that the comb teeth 50a are similarly formed in each circumferential groove 38a of the first lower mounting roller 38. And extends in the film feeding direction Q to the vicinity of the second lower guide guide 51, passing between the first lower placing roller 38 and the second upper nipping roller 47. Each comb tooth 52a of the upper guide 52 has two upper nipping rollers 46, 4
7 and is inserted into each circumferential groove 46a inside the outer peripheral surface of the first upper nipping roller 46 and passes between the first upper nipping roller 46 and the second lower placing roller 39. And extends in the film feeding direction Q along the comb teeth 51a. The second lower placement roller 39 and the first upper placement roller 46 are always in contact with each other regardless of whether the lid frame 42 is opened or closed,
The outer peripheral surface of the first lower placement roller 38 and the outer peripheral surface of the guide roller 36 are located on the film feed surface R between the outer peripheral surfaces. The film facing surface of each comb tooth 51a of the second lower guide 51 facing the film feeding surface R and the film facing surface of each comb tooth 52a of the upper guide 52 are
The comb teeth 51 are located inside the outer peripheral surface of the second lower placing roller 39 or the first upper nipping roller 46, respectively.
The film feeding surface R is provided between the film facing surfaces of a and 52a.
A predetermined gap is formed. Therefore, the transfer of the films 26 and 28 between them is excellent. The same applies to each comb tooth 50a of the first lower guide 50. By the way, each of the guides 50, 51, 5
Of the two comb teeth 50a, 51a, 52a, the film 2
The portions on which 6, 28 are rubbed are subjected to low frictional force treatment with the films 26, 28. The rotation trajectory of the cutter 37 on the cutter rotation shaft 33 intersects the film feeding surface R. When the lid frame 42 is moved downward and closed, the outer peripheral surface of the second upper nipping roller 47 abuts the outer peripheral surface of the first lower placing roller 38 on the film feeding surface R, and the grip plate 44 Each comb tooth 49 is a cutter 37
And a predetermined gap with respect to the film feeding surface R. When the lid frame 42 is moved upward and opened, the second upper nipping roller 47 and each comb tooth 49 are separated upward from the film feeding surface R.

In the drive system of the film switching device 8, the rotation of the rotary shaft 53 that rotates together with the lower pulley 18 in the film pull-in guide portion 16 of the fixed transport mechanism 9 of the film transport device 3 is as shown in FIG. As shown in FIGS. 6 and 7, it is transmitted to the drive rotating shaft 34 of the upper film feeding unit 29 and the lower film feeding unit 30 via the timing belt 54 and the clutch 55 as the driving means. The rotation of 34 is the guide roller 36.
To the second fixed shaft 35 via the round belt 40 from the first lower mount roller 38 on the drive rotation shaft 34. It is transmitted to 39. Then, as shown in FIG. 5 (b), the rotation of the second lower placement roller 39 causes the gear 5 to rotate.
It is transmitted to the first upper nipping roller 46 on the third fixed shaft 41 via 7, 58, and is further transmitted to the second upper nipping roller 47 on the fourth fixed shaft 45 via each round belt 48. A brake 59 is mounted on the drive rotary shaft 34. A clutch brake 60 is installed on the fixed plate 31 of each of the film feeding units 29 and 30, and the rotation of the drive rotary shaft 34 is controlled by the timing belt 6.
1 and this clutch brake 60 and timing belt 62
It is transmitted to the cutter rotating shaft 33 via.

The upper film feeding unit 29 is installed above the film pull-in guide portion 16 of the film conveying device 3, and the lower film feeding unit 30 is also installed below. By the rollers 38, 39, 46, 47 and the guide guides 50, 51, 52 of the upper film feeding unit 29, the upper film feeding portion 29a.
The film feeding surface R along the film feeding direction Q in the upper film feeding portion 29a is downward at a predetermined angle θ with respect to the film feeding direction 16 of the film feeding direction P of the film feeding device 3. Is inclined to.
Therefore, the comb teeth 51a, 52a protruding toward the film pull-in guide portion 16 along the film feeding direction Q are formed.
The upper film feeding surface R passes through the vicinity of the tangent to the winding end portion 14a of the upper flat belt 14 and the lower flat belt 15
Cross over the wrapping end 15a. The rollers 38, 39, 46, 47 and the guide guides 50, 51, 52 of the lower film feeding unit 30 constitute a lower film feeding portion 30a, and the lower film feeding portion 3
0a, the film feeding surface R along the film feeding direction Q
Is inclined upward at a predetermined angle θ toward the film pull-in guide portion 16 with respect to the film transport direction P of the film transport device 3. Therefore, each comb tooth 5 protruding toward the film pull-in guide portion 16 along the film feeding direction Q
Each film feeding surface R on 1a and 52a passes near the tangent to the winding end 15a of the lower flat belt 15.

As described above, the film pull-in guide portion 16
Each comb tooth 51 of the second lower guide guide 51 protruding toward
Although a and the comb teeth 52a of the upper guide 52 are close to each other along the film feeding surface R, they are further displaced in the film width direction orthogonal to the film feeding direction Q, and The upper comb teeth 52a between the comb teeth 51a
Is arranged. The tips of the lower comb teeth 51a project slightly toward the film pull-in guide portion 16 side than the tips of the upper comb teeth 52a. By the way, when the article 67 conveyed from the article supply apparatus 1 is placed on the mounting table 2a of the article receiving apparatus 2, as shown in FIG.
Is brought into contact with the stopper 2b at its front side and positioned, and is raised to the upper packaging portion S by the placing table 2a. The reference position of the article 67 in the packaging section S is the stopper 2
the front end side of the article 67 that abuts against b, and the article dimension W
₀ changes backwards based on this position. In the film transport device 3, the movable transport mechanism 10 moves with respect to the fixed transport mechanism 9 in accordance with the film width selected based on the article size W ₀ , and the distance N between the transport mechanisms 9 and 10 is set. Reference positions E of a plurality of different film widths H ₁ and H ₂ set so as to correspond to the reference position of the article size.
Is on the fixed conveyance mechanism 9, and as shown in FIG. 7C, the frontmost comb tooth 51a of the comb teeth 51a of the second lower guide 51 is on the reference position E. When the film widths H ₁ , H _2, ... H _n are set, the position E changes to the rear. The distance between the comb teeth 51a on the reference position E and the other comb teeth 51a is set in accordance with the distance between both ends of the prescribed films 26, 28 in the width direction. The comb teeth 50a of the other lower guide guide 50 are also arranged in accordance with the arrangement of the comb teeth 51a. The specified films 26 and 28 are stretch films for automatic packaging machines sold by each manufacturer, and film widths of 280 mm and 300 except for special cases.
The width pitches of mm and 320 mm are standardized by all manufacturers.

Next, the main electrical structure will be described. The article detection sensor 1a on the article supply apparatus 1 described above is for detecting the article dimension W ₀ along the transport direction before packaging. Here, the article size W ₀ means the article 67 in the packaging section S.
Is a dimension in a direction orthogonal to the film transport direction P when is supplied. By the way, in the automatic switching mode described later, the detection of the article size and whether or not the article is supplied are detected.In the operation mode by product code described below, only the supply of the article is detected, and the product is detected. The size is not detected.

As shown in FIG. 4, a position detecting sensor 13a, which is a potentiometer, is attached to the output side of the gap adjusting motor 13 of the film transport device 3. The position detection sensor 13a detects the position of the movable transport mechanism 10 of the film transport device 3. This interval adjustment motor 13
And both rotation guide shafts 11, 1 for supporting the movable transfer mechanism 10.
By means of 2, both transport mechanisms 9 and 10 of the film transport device 3
The distance adjusting means is configured to adjust the distance N according to the film width selected on the basis of the article size W ₀ .

The film feeding units 29a and 30a provided in the upper film feeding unit 29 and the lower film feeding unit 30 of the film switching device 8 respectively.
At the film leading-out position B in the film pull-in guide portion 16 of the film transport device 3 which is separated from the film standby position A near the tips of the comb teeth 51a and 52a in the film feeding direction Q by a predetermined distance. Two
A film front end detection sensor 63, which is a photoelectric switch for detecting the front end portions 26a and 28a of 6, 28, is attached. As shown in FIG. 4, a pulse transmitter 20a is attached to the output side of the film feeding motor 20 of the film feeding device 3 as a film feeding amount detecting means by the feeding machine powders 9 and 10 in the film feeding device 3. .
The pulse transmitter 20a emits a pulse according to the number of rotations of the film feed motor 20. The film feed motor 20 is controlled by the inverter 64 (see FIG. 9).

A control box 65 is attached to the machine casing 6 above the article supply apparatus 1. A controller 66 is built in the control box 65, and outside the control box 65, operation keys 65a connected to the controller 66 and a display screen 65b (see FIG. 9) are provided.

Although not described in detail, the controller 65 includes a central processing unit (CPU), a read-only memory (ROM) in which a predetermined control program and the like are stored in advance, and a random access memory (temporarily storing the calculation result of the CPU and the like). RA
M) and a backup RAM for storing previously stored data, and the like, which are configured as a logical operation circuit in which these are connected to an external input circuit and an external output circuit by a bus. This external input circuit includes the article supply device 1
The article detection sensor 1a on the upper side, the position detection sensor 13a on the interval adjustment motor 13, the film front end detection sensor 63 on the film pull-in guide section 16, and the pulse transmitter 20a on the film feed motor 20 are provided. It is connected. The external output circuit is provided with the interval adjusting motor 13
And the inverter 64, the clutch 55, the brake 59, and the clutch brake 60 of the film switching device 8.
And are connected. Then, the controller 66 reads the signals from the article detection sensor 1a, the position detection sensor 13a, the film front end detection sensor 63, the pulse transmitter 20a, and the operation key 65a as input values via an external input circuit, and these input values Based on the above, the distance adjusting motor 13, the inverter 64, the clutch 55, the clutch brake 60, the brake 59 and the display screen 65b are controlled via an external output circuit.

Next, of the various processing operations executed by the controller 66, the packing operation in the product code operation mode (operation after the packing machine is stopped) will be described with reference to the flowchart of FIG.

First, in the film setting device 8 shown in FIGS. 3 and 5, the first film winding roll 25 is inserted into the lower setting shaft 23 and the second film winding roll 27 is inserted into the upper setting shaft 21. Fit. The upper film feeding unit 29 and the lower film feeding unit 30 of the film switching device 8 are unlocked to open the lid frame 42 upward. Then, the second film 28 is pulled out from the second film take-up roll 27 via the upper tension lever 22, and the leading end portion 28a of the second film 28 is fed to the lower stage film, and the first lower placement roller 38 of the unit 30 and Each comb tooth 50 of the first lower guide 50
Place it on a and set it. On the other hand, from the first film take-up roll 25, the first film 26 is moved to the lower tension lever 2
Then, the leading end portion 26a of the first film 26 is sent out through the upper film 4 and is similarly set in the upper film feeding unit 29. Then, the respective lid frames 42 are closed downward and locked by the lock mechanism, and the leading end portions 26a, 28a of the upper and lower films 26, 28 are sandwiched by the first lower loading roller 38 and the second upper loading roller 47. .

Next, in step 101, when the data concerning the width H ₁ of the upper film 26 and the data concerning the width H ₂ of the lower film 28 are inputted by the operation keys 65a, the controller 66 makes them the widths H ₁ , H _2. The data corresponding to is stored (set film width detection means).

Next, in step 102, the paper is conveyed.
Optimum film width H for each article 67 ₀₁, H₀₂, H₀₃,…
H_0nIs also entered using the operation key 65a,
The width of the roller 66 is H₀₁, H₀₂, H₀₃, ... H_0nRemember
(Optimum film width storage means).

Next, in step 103, when the product code corresponding to the product to be packaged is input by the operation key 65a, the optimum film width data stored in the controller 66 is selected.

Next, in step 104, the controller 66 determines whether the set film width of H ₂ set film width H ₁ and the lower side film 28 of the upper film 26 are matched, not matched ( If NO), the process proceeds to step 105.

In step 105, the controller 6
6 determines whether or not the set film width H ₁ of the upper film 26 is smaller than the set film width H _{2 of the} lower film 28, and when it is determined to be small (YES), step 1
Move to 06.

In step 106, the controller 6
6 determines whether or not the set film width H ₁ of the upper film 26 is equal to or more than the optimum film width H _on based on the selected product code, and after it is determined to be (YES), it is started in step 107. When the switch is turned on, the process proceeds to step 108.

The controller 66 stores the interval N of the film transport device 3 for each film width, and in step 108, the width H _{1 of the} upper film 26 is detected based on the signal from the position detection sensor 13a on the interval adjusting motor 13. The motor 13 is driven and controlled so that the interval N corresponding to

The controller 66 is the film feed motor 2
For an output frequency of 0, one corresponding to a predetermined film transport speed and one corresponding to a lower predetermined film cueing speed are stored. Then, in step 109, the controller 66 drives the film feeding motor 20 and connects the clutch 55 of the upper film feeding unit 29, and the film transport device 3 and the upper film feeding unit 29 are driven in synchronization with each other. The controller 66 controls the inverter 64 based on the signal from the pulse transmitter 20a on the film feed motor 20 so that the output frequency of the film feed motor 20 matches the output frequency corresponding to a predetermined film cue speed. . Therefore, in the upper film feeding unit 29, the rollers 36, 38, 39,
The rotation of the rolls 46, 47 and the round belts 40, 48 causes the tip portion 26a of the upper film 26 to move into the guide guides 50, 51,
While being guided by the comb teeth 50a, 51a, 52a of 52, it is fed out at a low speed from an arbitrary initial set position between the lower mounting rollers 38, 39. Then the upper film 2
The leading end portion 26a of 6 is the winding end portion 15 of the lower flat belt 15.
It comes in contact with a and is sandwiched between the winding end portions 14a and 15a of the upper and lower flat belts 14 and 15 to reach the film cueing position B. When the film leading edge detection sensor 63 detects the leading edge 26a of the upper film 26 at that position, the controller 66 disengages the clutch attached to the film feed motor 20 based on the signal from the film leading edge detection sensor 63, and The brake attached to the motor 20 is operated to stop the film transport device 3 and the upper film feeding unit 29. Therefore, as shown in FIG. 8B, the leading end portion 26 a of the upper film 26 stops at the film cueing position B.

Next, in step 110, the packaging machine automatically starts operation (excluding film transport). Next, in step 111, the worker supplies the article supply device 1
By supplying the article 67 to the article 67, the article detection sensor 1 a on the article supply apparatus 1 detects the article 67 and the detection signal is input to the controller 66.

Next, in step 112, the controller 66 matches the output frequency of the film feed motor 20 with the output frequency corresponding to the predetermined film transport speed by the same inverter control, and the upper wrapping film at the film cue position B. The front end portion 26a of 26 is sandwiched between the upper and lower flat belts 14 and 15 and is fed toward the packaging portion S at a predetermined film conveying speed. When the upper film 26 reaches the packaging section S by being sent for a predetermined length based on the number of pulses from the pulse transmitter 20a, the controller 66 turns the clutch brake 60 on and off, and the cutter rotation shaft 33 makes one rotation from the standby position. The cutter 37 perforates the upper film 26. Then, the controller 66 disengages the clutch 55 and actuates the brake 59, so that the rollers 36, 38, 3 of the upper film feeding unit 29 are driven.
When the rotation of 9, 46, and 47 is stopped, the upper film 26 pulled out from the upper film take-up roll 25 is cut along the perforations, and the film cut end from the film supply source is the film cue. Stop near position B. On the other hand, the upper film 26 cut into a predetermined length
The rotation of the motor 20 is continued, and the number of pulses from the pulse generator 20a is input for the film transfer distance based on the film cut length that is input in advance, and when the predetermined number of pulses is reached, the packaging unit S Stop at the center of.

At the time of this film supply, the article 67 has already been loaded with the article 67 from the article feeding apparatus 1 and the mounting table 2 of the article receiving apparatus 2 at the lowest position.
It is placed on a and stopped. When the mounting table 2 a of the article receiving device 2 rises together with the article 67, the upper film 26 is lifted by the article 67 in the packaging section S. next,
In the film folding device 4, the upper film 26 is folded from three sides below the article 67 by the movable folding members 4b, 4c, 4d. After that, when the article 67 is carried forward by the carry-out belt 5a of the article carry-out device 5, the front side of the upper film 26 is also folded below the article 67 by the front fixed folding member 4a, and the packaging is completed.

In step 106, the upper fill
Width H of mu 26₁Is the optimum film width H _0nNot more than (N
O) and the controller 66 discriminate, step 11
Move to 3.

In step 113, the controller 6
6 determines whether or not the width H ₂ of the lower film 28 is equal to or more than the optimum film width H _0n , and when it is determined to be the above (YES), moves to step 114.

Steps 114, 115, 116, 11
7, 118 and 119 are the steps 107 and 1 respectively.
Corresponding to 08, 109, 110, 111, 112, the same work is performed on the lower film 28 instead of the upper film 26.

When the controller 66 determines in step 105 that the width H ₁ of the upper film 26 is not smaller than the width H ₂ of the lower film 25 (NO), the process proceeds to step 120.

In step 120, the controller 6
6 determines whether or not the width H ₂ of the lower film 28 is equal to or larger than the optimum film width H _0n , and if it is larger than (YES), proceeds to steps 114 to 119. Therefore,
A similar operation is performed on the lower film 28.

In step 120, the lower fill
Width H of Mu 28₂Is the optimum film width H _0nNot more than (N
O) and the controller 66 make a determination, step 12
Go to 1.

In step 121, the controller 6
6 determines whether or not the width H ₁ of the upper film 26 is equal to or larger than the optimum film width H _{0n, and when} it is larger than (YES), proceeds to steps 107 to 112. Therefore, the same work is performed on the upper film 26.

[0073] In step 104, if the width of H ₂ width H ₁ and the lower side film 28 of the upper film 26 are matched (YES) the controller 66 has determined,
Go to step 121.

In step 121, the controller 6
6 determines whether or not the width H ₁ of the upper film 26 is equal to or larger than the optimum film width H _{0n, and when} it is larger than (YES), proceeds to steps 107 to 112. Therefore, the same work is performed on the upper film 26.

In step 113, the width H ₂ of the lower film 28 is not more than the optimum film width H _0n (NO).
If the controller 66 determines that the width H ₁ of the upper film 26 is the optimum film width H _{0n in} step 121.
If the controller 66 determines that the above is not the case (NO), it is displayed in step 122 that there is no corresponding film on the display screen 65b.

On the other hand, for example, when switching to the upper film 26 while the lower film 28 is in use, the cut end of the lower film 28 located near the film cueing position B is
By rotating the motor 20 in the reverse direction for a predetermined number of pulses input from the pulse generator 20a, the film is retracted to the film standby position A at a low speed, and then the leading end portion 26 of the upper film 26 is reached.
Cueing is performed in the same manner as described above for a. In this case, the upper tension lever 22 is lowered so that the lower film 28 is not loosened, so that the film 28 is always in tension. The same applies to the case of switching to the lower film 28 while the upper film 26 is being used.

Next, the wrapping action in the product code operation mode during operation of the wrapping machine will be described with reference to the flow chart of FIG. 11 focusing on the differences from the flow chart of FIG.

Step 20 in the flowchart of FIG.
1,202,203,204,205,206,21
4, 222, 223 and 224 respectively represent steps 101, 102, 103 and 10 in the flowchart of FIG.
4, 105, 106, 113, 120, 121, 122
Refer to the description of the flowchart in FIG. 10 for details.

Step 107 in the flow chart of FIG.
112 and steps 114 to 119 are respectively shown in FIG.
The steps are changed to steps 207 to 213 and steps 215 to 221 in the flowchart of FIG.

At step 207, the article 67 is supplied to the article supply conveyor 1 and transferred, and is detected by the article detection sensor 1 a provided on the conveyor 1 and the detection signal is input to the controller 66.

In step 208, the controller 6
6 receives an article detection signal and receives an article 67 being transferred.
In order to complete the delivery to the placing table 2a in the article receiving device 2, the driving is performed so that the number of pulses preprogrammed is gradually reduced from the rotation speed of the packaging machine to stop. Therefore, when the packaging machine is decelerated and stopped, it is possible to prevent the contents piled up on the tray being transferred from being displaced or spilled due to an impact at the time of stop.

At step 209, the lower film 28 is pulled back from the vicinity of the film indexing position B of the film transport mechanisms 9 and 10. In step 210, the space N between the film transport mechanisms 9 and 10 is set to a space corresponding to the selected width of the upper film 26.

In step 211, the selected upper film 26 is transferred at a low speed and stopped until it is detected by the film front end detection sensor 63 of the film transport mechanism 9, 10.

In step 212, the film transport mechanism 9 and 10 and the upper film delivery unit 29 are synchronously driven by switching to the normal film transport speed to transport the film 26 to the center of the packaging section S. To do.

In step 213, the packaging machine is automatically started to push up the waiting article 67 on the placing table 2a of the article receiving apparatus 2 and then package and discharge the article 67. On the other hand, steps 213 to 221 are the same as step 20.
Corresponding to 7 to 213, the lower film 28 is used instead of the upper film 26 for packaging.

The flowchart for the automatic switching mode shown in FIG. 12 is different from the flowchart for the product code-specific operation mode (when the packaging machine is operating) shown in FIG. 11 in the following points.

In the product code operation mode, step 20
In step 2, the optimum film width H _0n for the packaged article 67 is input to and stored in the controller 66, and then the product code is selected in step 203. However, in the automatic switching mode, steps 202 and 203 are changed. That is, in step 302 following step 301, the controller 66 controls the set film widths H ₁ , H
Maximum dimension W ₁ of the packable article 67 which has been pre-programmed input every ₂ to select the W _2. And step 30
At 3, the start switch is turned on. Next, in step 304, the worker supplies the article 67 to the article supply apparatus 1, whereby the article detection sensor 1 on the article supply apparatus 1
The article 67 is detected at a, and the detection signal is input to the controller 66. The controller 66 supplies an article 67 based on a signal from the article detection sensor 1 a on the article supply apparatus 1.
By calculating the dimension W ₀ of, the process moves to step 305 and thereafter.

Steps 305, 306 and 30 of FIG.
7, 321, 322 and 323 correspond to steps 204, 205, 206, 222, 223 and 224 of FIG. 11, respectively, and set film widths H ₁ and H ₂ are the maximum article size W.
_{In addition} to replacing ₁ and W ₂ and replacing the optimum film width H _0n with the packaged product width W ₀ , the same determination as in the product code operation mode is performed in the automatic switching mode. Further, in the case of the automatic switching mode, it is necessary to detect the article size in step 304 before proceeding to step 305 and subsequent steps. Therefore, in step 2 shown in FIG.
The article detection discrimination of 07 and 215 is omitted in FIG. Steps 208 to 213 and 216 to 221 in FIG.
Are the same as 308 to 313, 315 to 320 in FIG. 12, respectively.

Although not shown, in the fixed mode, one of the upper film 26 and the lower film 28 is selected, and the selected upper film 26 or lower film 2 is selected.
Only when the dimension W _{0 of} the supplied article 67 is small with respect to the distance N between the film transport mechanisms 9 and 10 whose distance is adjusted according to 8, only the preselected film is forcibly fed out. ing.

The present embodiment has the following characteristics (a) to (b) regarding the film switching device 8 and the film setting device 7 and the film conveying device 3 associated therewith. (B) At the time of film switching, the film switching device 8
Film waiting position A in the feeding section 29a, 30a
The film front end portions 26a and 28a set to the position are transferred to the film front end detection sensor 63 in the pull-in guide portion 16 of the film transfer device 3 at a speed lower than a predetermined film transfer speed by the film transfer device 3 and stopped. Therefore, when the film is transferred from the film switching device 8 to the film transport device 3, the initial position of the film transport after the switching is surely performed to prevent the bending of the film front end portions 26a and 28a, and the smooth film transport is performed. Good packaging work can be done.

(B) Since the film transport device 3 and the film switching device 8 are driven in synchronization with each other at a predetermined film transport speed or slower than that, the initial position of the film transport after the switching and the subsequent film transport are performed. It can be done smoothly.

(C) Since the interval N between the two transport mechanisms 9 and 10 of the film transport device 3 is adjusted according to the film width selected based on the product dimension W ₀ , the product 67 and the product cradle device 2 are It is possible to prevent interference between the mounting table 2a and both transport mechanisms 9 and 10. Further, the space N is set in accordance with the widths H ₁ and H ₂ of the films 26 and 28 used according to the article size W ₀ , so that the film can be smoothly transported.

(D) Flow of the automatic switching mode described above.
-As shown in the chart, the article size W ₀To automatically detect
When automatically switching the film switching device 8,
Law W ₀The film with the optimum width is selected according to
Is preferred. However, with the same standard tray size
However, the dimensional error in manufacturing this tray and the inspection by the sensor
The detection value of the tray size may become a switching condition due to the output error.
There is a variation in the detected value before and after the dimensional data of the tray
In some cases, choose a film with a width different from the optimum width
There is a possibility that the film will be wasted. Such an automatic
Optimal film for each product 67 type in addition to the switching mode
Width is H₀₁, H₀₂, H₀₃... H_0nVoluntarily decided by the operator
Since the operation mode for each product code to be set is provided, the product dimensions
Select the film with the optimum width according to (height and width).
You can Furthermore, the optimum width H set for each product type_0nTo
The film has a set fill of the film setting device 7.
Currently set even if it does not exist in
Film width H₁, H₂From that, the best
Film width H_0nFilm with the above and closest width
Since I have chosen to interrupt the packaging work,
It is not necessary to attach the optimum film that has been set to the setting device 7.
It is possible to perform efficient packaging work.

(E) In the film switching device 8, the film feeding direction Q of the upper film feeding unit 29
And the film feeding direction Q of the lower film feeding unit 30 is inclined toward the film leading-in guide portion 16 with respect to the film feeding direction P of the film feeding device 3, and the film guiding guides 51 and 52 pull in the film. Since it projects toward the lower flat belt 15 of the guide portion 16 in the film feeding direction Q, the upper film feeding unit 29 tilts upward and the lower film feeding unit 30 tilts downward, and the space between them is increased. Can be widened. Therefore, not only the upper film feeding unit 29 but also the lower film feeding unit 3
Also for 0, the work of opening and closing the upper nipping rollers 46 and 47 with respect to the lower placing rollers 38 and 39 in the vertical direction and nipping the film front end portions 26a and 28a becomes easy, and the film front end portions 26a and 28a are respectively attached. The film feeding units 29 and 30 can be reliably set.

(F) The comb teeth 50a, 51a, 52a of the guides 50, 51, 52 are the lower placement rollers 38, 3 respectively.
9 are inserted in the circumferential grooves 38a, 39a or the circumferential groove 46a of the upper holding roller 46, and the film facing surfaces of the comb teeth 50a, 51a, 52a are located inside the outer circumferential surfaces of these rollers 38, 39, 46. Therefore, the rollers 38, 39, 46
Winding the films 26, 28 into the film 26,
It is possible to prevent film clogging caused by the generation of wrinkles due to self-adhesion of 28, and to reliably send out the films 26 and 28.

(G) In the film pull-in guide portion 16 of the film transport device 3, the center of rotation 1 of the upper pulley 17
7a is displaced downstream of the rotation center 18a of the lower pulley 18 in the film transport direction P, and the winding end portion 1 of the lower flat belt 15 is lower than the winding end portion 14a of the upper flat belt 14.
Since 5a projects to the upstream side in the film transport direction P, the comb teeth 51a, 52 of the film guide guides 51, 52 are formed.
The film leading ends 26a and 28a sent out from a can be reliably brought into contact with the lower flat belt 15 having high adhesion, and can be smoothly transferred from the film switching device 8 to the film transport device 3.

(H) Comb teeth 51a and upper guide guide 52 of the lower guide guide 51 projecting toward the lower flat belt 15 of the film pull-in guide portion 16 of the film transport device 3.
Since the comb teeth 52a and the comb teeth 52a are arranged so as to be displaced from each other in the film width direction, even if the film is extremely flexible and has adhesiveness like a stretch film,
The film transport device 3 is delivered from the rollers 39 and 46.
The film tip portions 26a and 28a are alternately guided by the upper and lower comb teeth 52a and 51a while being transferred to the film, so that the film tip portions 26a and 28a do not become stuck due to self-adhesion, and the film is switched. Transfer from the device 8 to the film transport device 3 can be smoothly performed.

(B) Since each comb tooth 51a of the lower guide 51 is arranged so as to be aligned with the space between both ends of the prescribed films 26 and 28 in the width direction, it is possible to support the lower part thereof. The both ends of the film width direction are supported from below without changing the film placement width of each of the film feeding units 29 and 30, and the both ends of the film width direction do not hang down from the film switching device 8 to the film transport device 3
The films 26 and 28 can be delivered to. Therefore, it is possible to prevent the films 26 and 28 from dripping to the wrapping section S while the film transporting device 3 is carrying the film to the wrapping section S.

In addition to the above-mentioned embodiment, the following (a) to
You may comprise like (C). (B) Regarding the recognition of the width of the film attached to the film setting device 7, when it is necessary to store the input data, the numerical value of the film width (for example, 330 m) is used.
m, 350 mm) with the operation keys 65a, a numerical value corresponding to the film width (for example, 330 mm)
"1", 350 mm is "2" data input) may be input by the operation keys 65a, and when it is not necessary to store the input data, a rotary selector switch assigned for each film width, etc. In the case of switching and setting with, the film widths 26a and 28a of the film winding rolls 25 and 27 set on the film setting shafts 21 and 23 provided in the film setting device 7 are automatically recognized by detecting the film widths 26a and 28a. There are cases.

(B) Wrapping end portion 1 of the upper flat belt 14
As for the means for projecting the winding end 15a of the flat belt 15 below 4a to the upstream side in the film transport direction P, the rotation center 17a of the upper pulley 17 is the rotation center of the lower pulley 18 as in the previous embodiment. It is possible to make the outer diameter of the lower pulley 18 larger than the outer diameter of the upper pulley 17 instead of displacing it to the downstream side of the film transport direction P from 18a.

(C) A motor is used in place of the clutch 55 and the brake 59, which are synchronous driving means for the film transport mechanisms 9 and 10 and the film feeding units 29 and 30.

[0102]

According to the film switching and feeding device of the first aspect of the present invention, when the film is transferred from the film switching device to the film transporting device, the film transporting position after switching is reliably performed to prevent the bending of the leading end portion of the film. However, it is possible to carry out good transportation and perform efficient packaging work. Further, it is possible to prevent interference between the article and both transport mechanisms of the film transport apparatus.

According to the second invention, it is not necessary to interrupt the packaging work and attach the designated optimum film to the setting device, and the efficient packaging work can be performed.
According to the third invention, not only in the upper film feeding unit but also in the lower film feeding unit, the work of holding the leading end of the film by opening and closing the upper holding roller with respect to the lower mounting roller in the vertical direction is performed. It becomes easier and the film leading end can be reliably set in each film feeding unit. Further, the leading end of the film can be smoothly transferred from the film switching device to the film transport device.

According to the fourth aspect of the present invention, it is possible to prevent the leading end portion of the film from getting stuck due to self-adhesion, and to smoothly transfer the film from the film switching device to the film transport device.

According to the fifth aspect of the invention, the film is transferred from the film switching device to the film conveying device without the both ends in the width direction of the film being hung down, and the film is hung down to the wrapping part during the film conveying to the wrapping part by the film conveying device. It is possible to prevent packaging defects due to

[Brief description of drawings]

FIG. 1 is a schematic side view of a stretch film packaging machine according to this embodiment.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a schematic front view showing a film switching device according to the present embodiment and a film transporting device and a film setting device related to the film switching device.

FIG. 4 shows a film transport device according to the present embodiment, which is indicated by X in FIG.
FIG. 3 is a schematic plan view viewed from X-ray.

FIG. 5A is a partial cross-sectional view showing a state in which the film front end is in a standby position in the upper film feeding unit and the lower film feeding unit of the film switching device, and FIG. It is a fragmentary sectional view showing an interlocking mechanism, and (C) is a fragmentary sectional view showing an interlocking mechanism between each of these units and a film transport device.

FIG. 6A is a plan view showing the upper film feeding unit of the film switching device according to the present embodiment as seen from the line Y ₁ -Y ₁ in FIG. 3, and FIG. 6B is the lower film feeding unit. FIG. 4 is a plan view of the unit viewed along the line Y ₂ -Y ₂ in FIG. 3.

7A is a partial cross-sectional view showing a lower side portion of the upper film feeding unit or the lower film feeding unit shown in FIG. 5A, and FIG. 7B is a portion showing an upper portion thereof. It is sectional drawing, (c) is a partial top view which shows the positional relationship between each comb tooth of a lower side, and each comb tooth of an upper side, and the positional relationship between each comb tooth of a lower side, and a film front-end | tip part. is there.

FIG. 8 (a) is a partially enlarged view of FIG. 5 (a),
5B is a partial cross-sectional view showing a state in which only the leading end of the film on the upper film feeding unit in the film switching device shown in FIG. 5A is pulled out to the indexing position of the film transporting device, and FIG. Similarly, it is a partial cross-sectional view showing a state in which only the leading end of the film on the lower film feeding unit is pulled out to this cueing position.

FIG. 9 is an electric block circuit diagram of the film switching / delivery device of the stretch film packaging machine according to the present embodiment.

FIG. 10 is a flow chart in a product code-specific operation mode (operation after the packaging machine is stopped) of the film switching / delivery device according to the present embodiment.

FIG. 11 is a flow chart in a product code-specific operation mode during operation of the packaging machine.

FIG. 12 is a flowchart in the automatic switching mode of the film switching / delivery device according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Article supply device, 1a ... Article detection sensor, 3 ... Film conveyance device, 7 ... Film setting device, 8 ... Film switching device, 9 ... Fixed conveyance mechanism, 10 ... Movable conveyance mechanism, 13
... Motor for adjusting the distance between both transport mechanisms, 14 ... Upper flat belt, 1
4a ... Winding end part, 15 ... Lower flat belt, 15a ... Winding end part, 16 ... Film pull-in guide part 17 ... Upper pulley, 17a ... Rotation center, 18 ... Lower pulley, 18a ... Rotation center, 20 ... A film feed motor as a driving means,
25 ... Film winding roll, 26 ... Upper film, 26
a ... Tip part, 27 ... Film winding roll, 28 ... Lower film, 28a ... Tip part, 29 ... Upper stage film feeding unit, 29a ... Film feeding part, 30 ... Lower stage film feeding unit, 30a ... Film feeding Shibe, 38 ...
Lower mounting roller, 38a ... Circumferential groove, 39 ... Lower mounting roller, 39a ... Circumferential groove, 42 ... Lid frame, 46 ... Upper clamping roller, 46a ... Circular groove, 47 ... Upper clamping roller, 47a ... Circular groove , 50 ... lower guide guides, 51a ... comb teeth, 51a ... lower guide guides, 52a ... comb teeth, 52 ... upper guide guides,
52a ... comb teeth, 55 ... clutch as drive means, 63
... Film front end detection sensor, 65 ... Control box, 6
6 ... Controller as control means or discriminating means or storage means or detecting means, 67 ... Article (tray), S ... Packaging section, N ... Space between both transport mechanisms, P ... Film transport direction, L ...
Displacement distance between rotation centers of the upper and lower pulleys, Q ... film feeding direction, R ... film feeding surface, A ... film standby position, B ... film cueing position.

Claims (5)

[Claims] 1. A transport mechanism (9, 10) is provided on each side of the packaging section (S), and a film (26, 26) carried in from a film pull-in guide section (16) of both transport mechanisms (9, 10). 28), a film conveying device (3) for feeding the film to the packaging section (S) at a predetermined film conveying speed, a film setting device (7) for mounting a plurality of film winding rolls (25, 27), and this film set Each of the film delivery units (29, 30) holds the film front end portions (26a, 28a) pulled out from the device (7) and waits, and selectively supplies the film front end portions (26a, 28a). Film switching device (8) for carrying out to the film transport device (3)
An article detection sensor (1a) for detecting an article size in a direction orthogonal to a film transport direction (P) when an article (67) is supplied to a packaging section (S) in a stretch film packaging machine including And both transport mechanisms (9, 10) of the film transport device (3)
Interval adjusting means (11, 12,
13, 13a) and a control means (66) for positioning the space adjusting means in correspondence with the film width selected based on the article size detected by the input signal from the article detection sensor (1a).
And the film feeding direction (Q) from the film standby position (A) in each of the film feeding units (29, 30).
A film leading edge detection sensor (63) for detecting the film leading edge (26a, 28a) at the film cueing position (B) in the pull-in guide portion (16) of the film transport device (3), Device (3) and film switching device (8)
Of the drive means (20, 55, 64) for synchronously driving the film delivery units (29, 30) of the above, and the film delivery units (29, 30) of the film switching device (8). And a specific film delivery unit (6) of the film switching device (8) selected based on the determination signal by the film delivery determination means (66). A control means (66) for controlling the drive means (20, 55, 64) so as to drive the (29, 30) in synchronization with the film transport device (3) at a speed lower than a predetermined film transport speed; Based on the detection signal from the front end detection sensor (63), the low speed driving of the film feeding unit (29, 30) of the film switching device (8) is terminated. Film switching delivery device in stretch film packaging machine is characterized in that a control means (66). 2. A transport mechanism (9, 10) is provided on each side of the packaging section (S), and a film (26, 26) carried in from a film pull-in guide section (16) of both transport mechanisms (9, 10). 28), a film transporting device (3) for feeding the film to the packaging section (S), a film setting device (7) for attaching a plurality of film winding rolls (25, 27), and a film setting device (7) pulled out from the film setting device (7). Each of the film feeding units (29, 30) has a film feeding unit (29, 30) for holding the film leading end portions (26a, 28a) held by the film feeding unit (3). ) Film switching device (8)
A stretch film wrapping machine comprising: a film transport device (3) and a film switching device (8).
The driving means (20, 55, 64) for synchronously driving the respective film feeding units (29, 30) of No. 1 and the data regarding the film width along the direction orthogonal to the film transport direction (P) are provided for each packaged article. An optimum film width storage means (66) for storing data relating to the film width when input to the device, and input data relating to the width of each film attached to the film setting device (8) or set values or each set film width. The set film width detection means (66) for recognizing each film width by automatically detecting the film width, the optimum film width stored in the optimum film width storage means (66) and the set film width detection means (66). Compared with the set film width, the optimum film width of each set film width is greater than or equal to this optimum film width The most close set film using a film discriminating means for selecting the particular use films having a width (66), and film feed according to use film based on the discrimination signal by the use film discriminating means (66) unit (2
9, 30) so as to drive the driving means (20, 5)
5, 64) and a control means (66) for controlling the film switching delivery device in the stretch film packaging machine. 3. A transport mechanism (9, 10) is provided on both sides of the packaging section (S), and a film (26, 26) carried in from a film pull-in guide section (16) of both transport mechanisms (9, 10). 28) a film transporting device (3) for sandwiching and feeding to the packaging section (S), and a film setting device (7) for mounting the first film winding roll (25) and the second film winding roll (27). An upper film feeding unit (29) and a lower film feeding unit (30) for holding the film front end portions (26a, 28a) pulled out from the film setting device (7) and making them stand by. A film switching device (8) for selectively delivering the leading end portions (26a, 30a) to the film pull-in guide portions (16) of both transport mechanisms (9, 10) in the film transport device (3). Stretch in the film wrapping machine, wherein both conveying mechanism in the film conveyance device (3) (9 provided with,
The film retraction guide portion (16) of 10) has an upper belt (14) wound around an upper pulley (17) and a lower belt (15) wound around a lower pulley (18). , The winding end portion (15a) of the lower belt (15) is projected to the upstream side in the film transport direction (P) from the winding end portion (14a) of the upper belt (14), and the film switching device (8) The upper and lower film feeding units (29, 30) are fixedly arranged between the lower placing roller (38, 39) and the lower placing roller (38, 39), respectively. And the upper nipping rollers (46, 47) nipping the front end portions (26a, 28a) of the first and second films (26, 28), and the axial direction of the upper and lower rollers (38, 39, 46, 47). To a plurality of circumferential grooves (38a, 39a, 46a)
And a comb-shaped film guide guide (50, 51, 52) disposed between the upper and lower rollers (38, 39, 46, 47) through the circumferential groove (38a, 39a, 46a).
And the upper and lower rollers (38, 39, 46, 47) of the upper film feed unit (29) and the upper and lower rollers of the lower film feed unit (30). The film feed surface (R) between (38, 39, 46, 47) and the film feed-in guide (1) with respect to the film transport direction (P) of the film transport device (3).
6) and the comb teeth (51a, 52a) of the film guide guides (51, 52) are arranged between the upper and lower rollers (39, 46) on the inner side of the outer peripheral surface of the peripheral grooves (39a, 46a). ) In the film feed-in guide portion (16) toward the lower belt (15) in the film feeding direction (Q), and the upper and lower film feeding units (2).
9. A film switching and feeding device in a stretch film packaging machine, characterized in that an upper holding roller (46, 47) of (9, 30) is supported so as to be vertically openable and closable with respect to a lower placing roller (38, 39). 4. A transport mechanism (9, 10) is provided on each side of the wrapping section (S), and a film (26, 26) carried in from a film pull-in guide section (16) of both transport mechanisms (9, 10). 28) a film transporting device (3) for sandwiching and feeding to the packaging section (S), and a film setting device (7) for mounting the first film winding roll (25) and the second film winding roll (27). An upper film feeding unit (29) and a lower film feeding unit (30) for holding the film front end portions (26a, 28a) pulled out from the film setting device (7) and making them stand by. A film switching device (8) for selectively delivering the leading end portions (26a, 28a) to the film pull-in guide portions (16) of both transport mechanisms (9, 10) in the film transport device (3). Stretch in the film wrapping machine, wherein both conveying mechanism in the film conveyance device (3) (9 provided with,
The film retraction guide portion (16) of 10) has an upper belt (14) wound around an upper pulley (17) and a lower belt (15) wound around a lower pulley (18). In the upper and lower film feeding units (29, 30) of the film switching device (8), the lower placement roller (38, 39) and the lower placement roller (38, 39) are respectively provided. ) And the first and second films (26,
28) upper nipping rollers (46, 47) nipping the front end portions (26a, 28a) of the upper and lower rollers (3).
8, 39, 46, 47) and a plurality of circumferential grooves (38a, 39a, 46a) arranged side by side at predetermined intervals in the axial direction, and the upper and lower rollers (38, 39a, 46a) passing through these circumferential grooves (38a, 39a, 46a). 39, 46, 47) and a comb-teeth-shaped film guide guide (50, 51, 52), and the film guide guide (50, 51, 52) has a film feeding direction. It has an upper guide (52) and a lower guide (51) in which a plurality of comb teeth (52a, 51a) are arranged in parallel along a direction orthogonal to (Q), and each comb tooth of the upper guide (52). (52a) and lower guide (5
The upper and lower rollers (39, 46) of each comb tooth (51a) of 1)
The circumferential groove (52a, 51a) on the inner side of the outer peripheral surface from the space
Through the film conveying device (3) toward the film pull-in guide portion (16) in the film feeding direction (Q), and the comb teeth (52a) of the upper guide (52) and the lower guide (51) A film switching and feeding device in a stretch film packaging machine, characterized in that the comb teeth (51a) and the comb teeth (51a) are displaced from each other in a direction orthogonal to the film feeding direction (Q). 5. A transport mechanism (9, 10) is provided on each side of the wrapping section (S), and a film (26, 26) carried in from a film pull-in guide section (16) of both transport mechanisms (9, 10). 28), a film transporting device (3) for feeding the film to the packaging section (S), and a film setting device (7) equipped with a first film winding roll (25) and a second film winding roll (27). And an upper film feeding unit (29) and a lower film feeding unit (30) for holding the film front end portions (26a, 28a) pulled out from the film setting device (7) for standby. A film switching device (8) for selectively ejecting the film front end portions (26a, 28a) to the film pull-in guide portions (16) of both transport mechanisms (9, 10) in the film transport device (3). Stretch in the film wrapping machine, wherein both conveying mechanism in the film conveyance device (3) (9 provided with,
The film retraction guide portion (16) of 10) has an upper belt (14) wound around an upper pulley (17) and a lower belt (15) wound around a lower pulley (18). In the upper and lower film feeding units (29, 30) of the film switching device (8), the lower placement roller (38, 39) and the lower placement roller (38, 39) are respectively provided. ) And the first and second films (26,
28) upper nipping rollers (46, 47) nipping the front end portions (26a, 28a) of the upper and lower rollers (3).
8, 39, 46) and a plurality of circumferential grooves (38a, 39a, 46a) arranged side by side at predetermined intervals in the axial direction, and the circumferential grooves (38
a, 39a, 46a) and a comb-teeth-shaped film guide guide (50, 51, 52) disposed between the upper and lower rollers (38, 39, 46, 47). 51, 52) comb teeth (51a, 5)
2a) between the upper and lower rollers (39, 46) and through the circumferential groove (39a, 46a) inside the outer peripheral surface thereof toward the film drawing guide portion (16) of the film transport device (3). Q), and each comb tooth (51) of this film guide guide (51, 52).
a, 52a) is at least the film feeding direction (Q)
A film switching and feeding device in a stretch film wrapping machine, characterized in that it is arranged at an interval capable of supporting the lower surfaces of both ends in the width direction of a specified film along a direction orthogonal to the direction.