JPH063767Y2 - Film cutting device in stretch wrapping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial field of application >> The present invention automatically wraps an object to be packaged such as meat, fruits, and prepared foods placed on a tray in a tray with a stretch film having stretch-restoring property. The present invention relates to improvement of a film cutting device of a stretch wrapping device.

<Prior art> A stretch film is an ultra-thin sheet that has excellent flexibility and tension recovery, and can be packaged while being stretched while it is packaged, and it can also be fixed against acids, alkalis, etc. Since it is chemically stable, it is widely used especially in supermarkets as a pre-pack for fresh food.

Various types of packaging (stretch packaging) using this stretch film have been developed. For example, a long stretch film wound around a material roll is intermittently fed by a feeding device at predetermined lengths, and Both sides in the width direction of the stretched film to be unwound are sequentially clamped by the clamping and transferring means along the longitudinal direction thereof and transferred to the packaging position while being held in a tensioned state, and are placed in the standby position, and the stretched film is packaged with respect to this stretched film. It is known to relatively press and wrap.

Here, in such a packaging device, since both sides of the stretch film are held in a tension state by being held by the holding and transporting means as described above, the both sides of the stretch film are cut at the position held by the holding means. Therefore, the cutting means for cutting the stretch film is arranged on the upstream side in the vicinity of the holding start position of the holding and transferring means,
The entire width of the stretch film is preliminarily cut into predetermined lengths before both sides are held by the holding and transporting means.

<Problems to be solved by the invention> However, in the above-mentioned conventional stretch wrapping device, since the stretch film is extremely soft and is not stiff, the front end portion of the stretch film whose full width has been cut is held at the holding start end of the holding transfer means. When inserting into, the front end portion was curled or crushed, so that it could not be smoothly inserted into the holding start end, and in some cases, the stretch packaging device had to be stopped.

On the other hand, perforations are formed in the width direction of the stretch film at a predetermined length upstream from the holding start position of the holding and transferring means so that the front end part of the cut portion of the stretch film is smoothly supplied to and held by the holding and transferring means. However, before the perforation forming part is held by the holding and transferring means and does not enter too deeply, the transfer of the stretch film is braked by the brake means provided on the upstream side of the holding and transferring means, which causes the stretch film. A packaging device in which a stretch film is cut from the perforated portion by utilizing tension is disclosed in Japanese Patent Laid-Open No. 62-100.
It is disclosed in Japanese Patent Publication No. 365.

However, in such a proposal, since the perforation forming portion is already held by the holding and transferring means, the stretch film between the holding start end of the holding and transferring means and the braking means is more than the perforated forming portion. A large tension is applied to the portion, which may cause the stretch film to be stretched before it is attached to the object to be packaged.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to smoothly feed the front end portion of the cut portion of the stretch film to the holding and transporting device and hold it. It is an object of the present invention to provide a film cutting device in a stretch packaging device that does not cause the stretch film to stretch before being attached to an object.

<< Means for Solving Problems >> Therefore, in order to achieve the above object, in the film cutting device in the stretch packaging device according to the present invention, the stretching means for feeding the stretch film from the original roll and the feeding means are synchronized with the feeding means. Of the stretch film that is operated by the above-mentioned feeding means, and the widthwise both sides of the stretch film are sequentially clamped along the longitudinal direction, and the clamping transfer means for transferring and holding the stretched film to the packaging position in a tension state, and the clamping transfer means. A first notch is provided on the upstream side of the holding start position, and is formed on both sides of the stretch film before being held by the holding transfer means, which is slightly longer than the width of the stretch film held by the holding transfer means. The first cutting means and the holding means provided on the downstream side of the holding start position of the holding and transferring means, and held on both sides by the holding and transferring means. A second cutting means that cuts the entire width by forming a second cut continuous to the first cut in the widthwise central portion of the stretch film.

<< Operation >> In the film cutting device in the stretch wrapping device according to the present invention having the above-described configuration, the stretch film wound around the original fabric roll is intermittently fed out by the feeding means by a predetermined length, and the fed stretch film is The paper is fed to the holding and transferring means that is operated in synchronization with the feeding means, and the widthwise both sides are sequentially held along the longitudinal direction, and are transferred and held in the tensioned state at the packaging position. At this time, it is fed out by a predetermined length and transferred to the packaging position 1
The stretch film of the cycle is cut in its full width in two steps. That is, at the trailing end portion of the stretch film for one cycle, first, the first notches on both sides in the width direction of the stretch film, which are slightly longer than the width of the stretch film held by the gripping transfer means, are held by the holding means. Before being preformed by the first cutting means, then transferred to the packaging position and sandwiched by the first holding means by the holding means, then by the second holding means the first cutting means
A second notch following the notch is formed in the central portion of the stretch film and cut across its entire width.

In other words, while the front end of the stretch film having the first cuts formed on both sides is continuously connected to the rear end of the stretch film of the previous cycle, the stretch film is pulled by the holding and transporting means, and is then uncut. The central part of the second
Since it is cut by the cutting means of, the front end of the stretch film of the next cycle can be smoothly and smoothly held in the holding and transferring means, and the stretch film is transferred to the packaging position until it is held and held. No significant tension is applied and no stretching occurs before it is applied to the package.

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

In FIG. 1, FIG. 2 shows a side view and a plan view of a stretch wrapping device 1 equipped with a film cutting device according to the present invention. As shown in the figure, a holding belt as a holding and transferring means for transferring and holding the conveying device 3 and the stretch film of the object to be packaged between the machine frame portions 2 arranged in a pair on the left and right in a tension state to the packaging position. The devices 4 are each arranged horizontally. On the other hand, a discharge conveyor device 5 is horizontally arranged above the stretch wrapping device 1, and a raw roll 7 around which a stretch film 6 is wound is arranged on a side part of the stretch wrapping device 1.

Next, each part will be described in detail. The transport device 3 is for transporting the article to be packaged 10 to a position below the holding belt device 4, and specifically, a pair of left and right conveyor frames 11 and this conveyor frame. It is composed of a pair of left and right endless chains 12, which are arranged inside 11 respectively. This endless chain 12 has a drive sprocket 13 and a driven sprocket 14 as shown in FIG.
It is installed between and can be moved along the conveyor frame 11. Further, a plurality of fingers 15 are attached to the endless chain 12 at predetermined intervals, and the fingers 15 are engaged with both sides of the rear end portion of the article to be packaged 10 and pushed. Therefore, when the article to be packaged 10 is placed on the starting end side of the transport device 3 as shown in FIGS. 1 and 2,
The fingers 15 push both sides of the rear end portion of the article to be packaged 10 and the article to be packaged 10 is conveyed in the direction of arrow a. In this embodiment, the article to be packaged 10 is composed of a tray 10a having a tray shape and the content 10b placed on the tray 10a.

On the other hand, a pair of left and right detecting means 16 are arranged at positions near both ends of the conveying path of the article to be packaged 10 as shown in FIGS. 1 and 2. This detection means is, for example, a so-called optical sensor consisting of a combination of a light emitter and a light receiver,
When the object to be packaged 10 blocks the light of the light projector during transportation, the light receiver detects it. Then, as shown in FIG. 3, the detection result of the detection means 16 is input to the controller 17, and the length of the article 10 to be conveyed in the conveyance direction is determined from the conveyance speed and the light-shielding time of the article 10 preset by the controller 17. The length L is calculated, and the optimum length of the stretch film 6 required to wrap the article 10 having the length L is calculated.

A lift device 20 is disposed between the pair of conveyor frames 11 on the terminal end side of the transfer device 3 as shown in FIG. The lift device 20 is composed of an elevating table 21 which can be vertically moved up and down, and a plurality of inclinable claws 22 which are erected on the elevating table 21 and which are stopped by a stopper 23. Is placed on the claw 22 and lifted toward the holding belt device 4. A sensor (not shown) that detects the contact of the article to be packaged 10 is incorporated in the stopper 23, and a signal from this sensor is input to the drive control unit of the lift device 20 to raise and lower the platform 21.
Is rising.

The holding belt device 4 disposed above the lift device 20 holds the both sides in the width direction of the stretch film 6 continuously drawn out by a feeding device or the like described later sequentially along the longitudinal direction at the packaging position. The first and second belts 26 are transferred to and held in a tensioned state, and a total of four first and second belts 26 are formed in each pair as shown in FIG. 1 and FIG.
It is composed of 26, 27 and 27. First belt 2
Reference numerals 6 and 26 are arranged on the lower side and are provided between the first drive pulley 28 and the driven pulley 29 so as to be driven intermittently in the direction of arrow b in FIG. The second belts 27, 27 are disposed on the upper side, and the second drive pulley 30
And the first belt 26 provided between the driven pulley 31 and
It is adapted to be driven intermittently in the direction of arrow c in synchronism with. The upper side of the first belt 26 and the lower side of the second belt 27 are in pressure contact with each other, and the stretch film 6 is sandwiched between the pressure contact surfaces. The second belt 27 has a pair of tension pulleys 32, 3
2 is applied.

Further, as shown in FIG. 1 and FIG. 2, a feeding device 35 is provided on the side of the gripping belt device 4 where the gripping is started, that is, in the vicinity of the left end side of the gripping belt device 4 in FIG. The feeding device 35 is for feeding the stretch film 6 intermittently by a predetermined length and supplying it to the holding belt device 4, and is composed of a pair of drive rollers 36, 36 and idle rollers 37, 37. The stretch film 6 is fed between the drive rollers 36, 36 and the idle rollers 37, 37. As shown in FIG. 2, the feeding devices 35 are arranged in a pair of right and left, and only both side portions of the stretch film 6 are sandwiched between the drive rollers 36, 36 and the idle rollers 37, 37. The drive rollers 36, 36 and the first,
The second drive pulleys 28, 30 are driven in synchronization with each other.

Further, in this embodiment, the drive rollers 36, 3 are located upstream of the pinching start position of the sandwiching belt device 4.
A first cutter 38 as a film cutting device is arranged between the six members as shown in FIGS. 1 and 2. As shown in FIG. 4 (a), the first cutter 38 is provided on both sides of the stretch film 6 with the belt 26,
The first notch 40, which is slightly longer than the width of 27, is inserted at a right angle, and is driven forward and backward with respect to the stretch film 6 by the fluid cylinder 39. On the other hand, a second cutter 41 as a film cutting device is disposed at a position on the downstream side (a little right side position of the left idle roller 32 in FIG. 1), which is slightly inward from the gripping start side of the holding belt device 4. ing. As shown in FIG. 4 (c), the second cutter 41 is for making a second notch 42 continuous with the first notch 40 in the widthwise central portion of the stretch film 6, and is a fluid cylinder. It is adapted to be driven forward and backward by 43. As described above, since the first notch 40 and the second notch 42 are separately provided before and after being sandwiched in the sandwiching belt device 4, the stretch film 6 that has been cut into the full width at once as in the conventional case is directly sandwiched. As compared with the case where the belt device 4 is inserted, the holding belt device 4 is smoothly inserted.

In addition, the original roll 7 around which the stretch film 6 is wound
Is a pair of support rolls 4 as shown in FIG. 1 and FIG.
It is placed on 6,46. The pair of support rolls 46, 46 are free to rotate, and when the stretch film 6 pulled out from the original fabric roll 7 is pulled by the feeding device 35, the force causes the original fabric roll 7 to move in the direction of arrow d in FIG. It is designed to rotate in the direction. Both ends of the pair of support rolls 46, 46 are supported by a pair of bracket plates 45, 45 projecting laterally from the machine frame 2.

Furthermore, in this embodiment, the discharge conveyor device 5 is arranged above the stretch wrapping device 1. The discharge conveyor device 5 is formed of a thick sponge in the shape of an endless belt, and the sponge surface is lightly applied to the upper stretch film 6 of the packaged item 10 after packaging is completed, and the packaged item is shown in the direction of arrow e in FIG. It sends out 10. Then, the delivered article 10 to be packaged is conveyed to a predetermined accumulation place by the discharge conveyor 47.

Next, the operation of the above-described embodiment will be described. First, as shown in FIGS. 1 and 2, when the article 10 to be packaged is placed on the upper surface of the conveying device 3 on the starting end side and the drive sprocket 13 is rotated, the article 10 is packaged. While being pushed by the finger 15, it is conveyed in the direction of arrow a. At this time, when the article to be packaged 10 passes in front of the detection means 16, the light-shielding time at that time is sent to the controller 17, and the length L of the article to be packaged 10 in the transport direction is determined from the light-shielding time and the transport speed of the transport device 3. Calculated instantly. In addition, the length of the stretch film 6 that is optimum for the length L in the transport direction, that is, when the object to be packaged 10 is wrapped with the stretch film 6, the stretch film 6
The length of the stretch film 6 is calculated by the controller 17 such that the length of self-adhesion polymerization on the lower surface of the article to be packaged 10 is neither too long nor too short, and at the same time necessary for that purpose. The total number of revolutions N of the drive roller 36 of the feeding device 35 per cycle is calculated. The rotation speed N is temporarily stored in the memory of the controller 17, and the memory value is output at the same time when the article 10 having the length L is conveyed to the top of the lift device 20, and the third value is output.
The motor 48 for rotating the drive roller 36 shown in the figure is controlled to rotate N times. A rotation speed counter 49 is attached to the motor 48 so that the total rotation speed for each cycle is continuously input to the controller 17 for quick feedback control.

However, in the stretch wrapping apparatus 1, the motor 48 is temporarily stopped just before the rotation of the motor 48 for one cycle is completed, and then is slightly rotated again to be stopped. That is, since the stretch film 6 is cut in two steps as shown in FIG. 4, the first cut 40 is made by stopping the motor 48 just before the motor 48 is completely rotated.
And then rotate it again to stretch film 6
By a distance l (equal to the mutual distance between the first cutter 38 and the second cutter 41) as shown in FIG.
Finally, make a second notch 42 and stretch film 6
To cut the entire width.

As described above, in this embodiment, before the stretch film 6 is fed to the end, the first cut 40 is made in advance in the portion to be held by the holding belt device 4, so that the stretch film 6 is fed to the end. Then, as shown in FIGS. 4 (b) and 4 (c), the front end portion of the stretch film 6 for the next cycle is already smoothly and smoothly caught in the holding belt device 4. On the other hand, when the front end portion of the stretch film 6 which has been cut into the full width is inserted between the driven pulleys 29 and 31 of the holding belt device 4 as in the conventional case, the front end portion of the stretch film 6 is extremely soft and has no waist. Although it may not be smoothly inserted between the driven pulleys 29 and 31 due to being rolled or crushed and the stretch wrapping device 1 may have to be stopped in some cases, in the present embodiment, the front end of the stretch film 6 is stopped. Part of the stretch film 6 of the previous cycle and the holding belt device 4 while continuing.
Since it is pulled into the device 4 while pulling with,
Unlike the conventional case, the front end portion of the stretch film 6 does not curl, and the stretch film 6 can be inserted into the holding belt device 4 extremely smoothly. Further, the front end of the stretch film 6 is pulled into the device 4 while being pulled by the sandwiching belt device 4 while keeping the front end of the stretch film 6 of the previous cycle continuous, and then the uncut central portion is moved to the second cutter. Since it is cut at 41, the stretch film 6 is not subjected to a large tension until it is transferred to and held in the packaging position, and stretching may occur before it is attached to the article to be packaged 10. Absent.

Then, when the article to be packaged 10 is conveyed to above the lift device 20 and comes into contact with the stopper 23, the lift device 20 is driven and the article to be packaged 10 is supported on the claws 22 of the elevating table 21 and moves upward. Can be lifted. At this time, the motor 48 has already completed one cycle of rotation, and the stretch film 6 is stretched horizontally between the left and right belts 26-27 and 26-27 of the holding belt device 4.
However, at this time, as shown in FIG. 4B, only the first notch 40 is made in the stretch film 6, and the second notch 42 is not yet made. That is, the stretch film 6 stretched horizontally on the holding belt device 4
Is still continuous with the original roll 7 at this stage. Therefore, when the article to be packaged 10 rises and pushes up the stretch film 6, it is possible to apply a sufficient tension force to the stretch film 6 on the surface of the article to be packaged by effectively exerting a tensile constraint on the original roll 7 side. The content 10b is securely fixed, and a tension-free appearance without wrinkles is obtained to improve the appearance.

When the article 10 to be packaged is further lifted and lifted to the final height, the blade 50 is inserted into the lower surface of the tray 10a of the article to be packaged 10 while tilting the claw 22 from the side of the elevating table 21, and the stretch film 6 is provided with a second The notch 42 is cut and cut along the entire width thereof, and the peripheral portion of the stretch film 6 is cut by the blade 50 into the tray 10.
It is rolled up on the lower surface of a and self-adhesively polymerized with each other. Then, this superposed portion is heated and welded by a hot plate (not shown) arranged in the middle of the discharge conveyor 47, whereby the packaging of the content 10b is completed.

As described above, the feeding length of the stretch film 6 is controlled in accordance with the length L of the object to be packaged 10 so that the overlapped portion has the optimum length. There is no inconvenience such that the stretch film 6 is wrinkled and wrinkled on the back side, or the stretch film 6 is not long enough to obtain a sufficient polymerization length.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, especially when the length of the tray 10a is changed. Considering this, the detection means 16 was provided only at one place in order to feed the stretch film 6 having the optimum length.
Since the optimum length of the stretch film 6 varies depending not only on the length of the article to be packaged 10 but also on the height and shape in the vertical direction, a plurality of detecting means may be provided in the vertical direction along the conveyance path of the article to be packaged 10. Or, an object to be packaged 10 provided with an image recognition system in which a video camera and a computer are combined.
It is also possible to detect the shape, size, etc.

In addition, it detects changes in the size and shape of the package in the width direction,
In order to accommodate the change, a structure may be added in which an extra length in the width direction of the stretch film 6 is cut off before packaging.

In addition to the packaging device for packaging the article to be packaged with one stretch film 6 from one side, the present invention continuously feeds two stretch films along the top and bottom of the conveying line of the article to be packaged. It can also be applied to a wrapping device that puts the wrapping material on both the top and bottom simultaneously.

<< Advantages of Device >> As described above, in the film cutting device of the stretch wrapping device according to the present invention, the front end of the stretch film having the first cuts formed on the both sides is the rear end of the stretch film of the previous cycle. After pulling into the same means while pulling it with the holding and transferring means while continuing, the uncut central portion is cut with the second cutting means to cut the entire width, so that the front end portion of the stretch film of the next cycle is cut. In addition to being able to smoothly and smoothly grip the holding and transferring means, the stretch film does not receive a large tension until the stretch film is transferred to and held in the packaging position. No stretching occurs in the stretch film before it is worn.

[Brief description of drawings]

1 to 4 show one embodiment of the present invention, and FIG. 1 is a schematic side view of a longitudinal section of a stretch wrapping device,
FIG. 2 is a schematic plan view of the apparatus, FIG. 3 is a configuration diagram of control means of the feeding apparatus, and FIGS. 4 (a) to 4 (c) are cutting process diagrams of the stretch film. 1 ... Stretch wrapping device 3 ... Conveying device 4 ... Holding belt device (holding transfer device) 5 ... Ejection conveyor device 6 ... Stretch film 7 ... Original roll 10 ... Packaged item 16 ... Detecting device 17 ... Controller (control means) 20 ... Lifting device 35 ... Feeding device (feeding means) 38 ... First cutter (first cutting means) 40 ... First cutting 41 ... Second cutter (Second cutting means) 42 ... Second cutting

Claims (1)

[Scope of utility model registration request] 1. A feeding means for feeding a stretch film from an original roll, and both side portions in the width direction of the stretch film fed from the feeding means, which are operated in synchronization with the feeding means, are sequentially held along the longitudinal direction. A gripping transfer means for transferring and holding the gripping transfer means to a packaging position in a tensioned state, and a gripping transfer means provided upstream from a gripping start position of the gripping transfer means,
First holding means for forming first cuts on both sides of the stretch film before being held by the holding transfer means, the first notches being slightly longer than the holding width of the stretch film by the holding transfer means in the width direction, and the holding means. Provided on the downstream side of the holding start position of the transfer means,
A second continuous continuous first slit in the widthwise central portion of the stretch film held on both sides by the sandwiching and conveying means.
A film cutting device in a stretch wrapping device, comprising: a second cutting means for forming a notch and cutting the entire width.