JP2790098B2 - Stretch film packaging machine - Google Patents

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 for wrapping goods by using a stretch film, and more particularly, to a method in which goods placed on a goods mounting table are conveyed onto an elevator by means of a conveyer or the like. The elevator itself also serves as a transport means, and after transporting the product under the packaging unit, the elevator is raised to cover the top surface of the product with the film stretched over the packaging unit, and to attach the end of the film to the bottom of the product. The present invention relates to a so-called elevator type stretch film wrapping machine.

[0002]

2. Description of the Related Art After an article placed in a carry-in section is conveyed under a packaging section, the elevator is raised to cover the top surface of the article with a film stretched over the packaging section and to attach an end of the film to the bottom of the article. The stretch film wrapping machine, which folds the paper, is usually placed on the loading table provided at the loading end (in the case of a weighing / packaging / pricing machine, the loading table is a weighing pan). The apparatus is configured to start by placing the product or placing the product conveyed by a conveyor or the like, and to start the packaging operation of the product. In particular, when the product is placed manually, the product is placed so that the center in the width direction of the loading table (the center of the carry-in conveyor) coincides with the center in the width direction of the product (center reference). Position regulation cannot be performed by bringing the end into contact with a guide or the like, and the product may be placed with its center shifted left and right (in the width direction). On the other hand, the arrangement of the left and right folding plates provided in the packaging machine, the centering control of the film, and the like are based on the assumption that the center of the product coincides with the center of the carry-in conveyor.

[0003]

Although there is no such problem when the amount of displacement of the product is small,
If the amount of misalignment increases, it affects the packaging finish, and not only does the appearance of the product deteriorate, but also the packaging fails, the product is damaged, the product falls into the packaging machine,
The product may be stuck between the elevator and the folding plate. This problem was raised during the transportation of goods.
This problem can be solved by arranging a centering device as proposed in JP-A-122624 and automatically correcting the displacement, but by providing the centering device, the device becomes large and the structure is complicated. This has the disadvantage of increasing costs.

[0004] From such a background, the applicant of the present application detects the amount of misplacement of the product, prohibits the activation of the apparatus when the amount of misalignment is equal to or more than a predetermined value, and warns of a request for re-installation of the product. The contents described above have been proposed (Japanese Patent Application No. 7-221871). However, even in this case, if the degree of deviation is equal to or less than a predetermined value, packaging is performed with the deviation, which may affect the packaging finish.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a stretch film packaging machine capable of performing good-looking packaging without correcting a placement deviation by a centering device or the like even when the placement deviation occurs.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, a technical measure taken by the present invention is a film cut from a predetermined length by a product placed on a product mounting table being conveyed under a packaging section. Is transported to the packaging unit and stretched, the product is pushed up toward the film, the upper surface of the product is covered with the film, and the end of the film is folded into the bottom of the product. A shift amount detecting means for detecting an amount of shift from a reference point of the apparatus in a direction orthogonal to a conveying direction of the product placed on the mounting table; and a packaging machine based on the amount of shift detected by the detecting means. Adjusting means for changing the control. Note that the placement displacement is a displacement of the product in the left-right direction, that is, a displacement from a reference point of the apparatus in a direction perpendicular to the transport direction, and is generally located at a center in the width direction of the product in a direction perpendicular to the transport direction. This is the distance from the center of the device (transporting means). However, the center of the device (transporting means) does not mean that the physical dimension is exactly in the middle, but is the center set in the device when performing the packaging process, and the left and right folding plates are arranged symmetrically with respect to this center. And centering in the sense that the film is centered.

[0007] The displacement amount detecting means for detecting the placement displacement is arranged on a product placement table on which the product is placed, and after the product is placed on the placement table, detects the displacement of the product before starting the transport of the product. Alternatively, the detecting means may be arranged on the transport path of the product from the product mounting table to the elevator, and the mounting displacement of the product may be detected during the transport of the product. Further, the above-mentioned displacement amount detecting means may also serve as a sensor for detecting the width dimension of the product. In that case, a reflection type optical sensor is preferable, and the number of sensors to be installed is one or two. Further, a large number may be provided, and if two are provided, they are configured to move in diametrically opposite directions to be separated from or approach to each other.

In the case where a detection means for detecting the width dimension of the product is provided in addition to the deviation amount detection means, at least one of the operating sections of the apparatus is based on the detection results of the deviation amount detection means and the width dimension detection means. The operation or stop timing of some of the operation units is determined. Further, the control contents of the packaging machine, which are changed by the adjusting means based on the detection result of the above-mentioned shift amount detecting means, include a centering position of the film, a timing of operation and stop of the left and right folding plates, and a plurality of films for holding the end of the film. The timing of releasing the film clamping of the divided film clamp means is exemplified. Further, the above-mentioned packaging machine may be provided with a notifying means for notifying the worker when the start of the apparatus is prohibited or the operation of the apparatus is stopped by the adjusting means. In addition, the stretch film packaging machine according to the present invention is capable of measuring, packaging,
The present invention can be applied to a packaging machine having a pricing function or a packaging machine having a simple packaging function.

According to the above arrangement, when a product placed on the product mounting table is placed in a lateral direction with respect to the reference point of the apparatus in a direction perpendicular to the transport direction, the amount of displacement is reduced. An operation unit related to packaging, which is detected by the shift amount detecting means and based on the detected amount of the mounting shift, that is, a centering position of the film, a timing of operation and stop of the left and right folding plates, a plurality of divided films. Since the control such as the timing of releasing the clamping of the film by the clamp means is changed and adjusted, the packaging finish is not deteriorated even if the packaging is performed with the gap kept, and a packaging finish of a certain level or more can be obtained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a stretch film packaging machine according to the present invention will be described with reference to the drawings. The stretch film wrapping machine shown in FIGS. 1 to 3 is a weighing / pricing and wrapping machine provided with a mechanism (pre-stretching mechanism) for expanding the width direction of the film, and the product G is placed in front of the machine frame A. A mounting table a is provided, and near the front side of the product mounting table a, there are provided reflective optical sensors 1 and 1 'and a moving means 2 for moving the reflective optical sensors 1 and 1' in the width direction of the product. A product displacement / dimension detecting means B is provided, and the product G placed on the product placing table a is transported by the transport conveyor 3 to the elevator 4 provided inside the machine frame A.
The height and length (depth) of the product G are detected by the sensor 3a during the transportation. In addition, the elevator head of the elevator 4 that receives the product G is configured to be inclined when at least one of the left and right folding plates and the rear folding plate abuts.

The product G is provided on the front edge of the product mounting table a.
The positioning stopper 5 when mounting is set up and protruded,
On the outer peripheral surface of the belt 3 ′ of the conveyor 3, a pusher 6 for pressing and transferring the product at a predetermined interval in the length direction is fixed, and the conveyor 3 is configured to be intermittently driven. The intermittent driving is stopped when the pusher 6 attached to the belt 3 ′ of the conveyor 3 is detected by the pusher initial position sensor 7 at the lower front of the product mounting table a, and the product is mounted on the product mounting table a. Weighing is performed, and is started when the weighing is completed.

A packaging portion b is provided above the elevator 4, and as shown in FIG. 2, a film roll disposition portion 8 and a film roll 9 set in the disposition portion 8 are fed upstream of the packaging portion b. Film holding means C for holding the leading end of the film 9 'to be held, and film feed means D for holding and pulling the film held by the film holding means C and conveying the film to the packaging part b. A cutter E that is arranged close to the tip of C and that is cut between the film holding means C and the film feeding means D and cut into a predetermined length from the film that is nipped and pulled out by the film feeding means is arranged. On the left and right sides of the packaging part b above the film feeding means D, left and right folding plates 10, 10 'for folding the end of the film covering the surface of the product to the lower side of the product and a rear folding plate 41 are arranged. Further, a discharge pusher 11 for discharging the packaged product is disposed above the discharge pusher 11, and the discharge pusher 11 is configured so that the product is horizontally pushed and discharged toward the heat seal portion F on the front side of the machine frame A. Have been.
Note that the front end of the film 9 'is folded into the bottom surface of the product by being pushed to the heat seal portion F, and the end of the folded film is heat sealed by the heat seal portion F to complete the packaging. The left and right folding plates 10 and 1
0 'are configured to be driven by independent motors, respectively. Thereby, the operation and stop timings of the left and right folding plates 10, 10 'can be changed separately.

The film holding means C holds and holds both sides of the film 9 'which is unwound from the film roll 9 set in the film roll disposing portion 8, and is held below the film as shown in FIG. Endless belt placed
12 and the film 9 ′ supported on the surface of the endless belt 12
And a pressing member 13 for pressing the endless belt 12 against the endless belt 12, and a pair of holding means including the endless belt 12 and the pressing member 13 are arranged on both sides of the film at an interval corresponding to the interval of the film width. The pressing member 13 is pivotally supported at one end and is provided so as to be freely opened and closed. The endless belt 12 is configured to be driven and rotated by a motor 12a. Incidentally, the film holding means C may be configured such that one or both of the holding means can be moved in the width direction according to the film width so as to correspond to the film roll 9 set in the film roll disposing portion 8.

The film feeding means D is a pair of upper and lower endless elastic belts for sandwiching the lateral end of the film in the width direction.
14 and 14 'and the lower elastic belt 14'
And a pressing belt 16 which is disposed on the upper surface of the lower end of the elastic belt 14 ′ so as to overlap with the upper surface of the lower end of the elastic belt 14 ′. The distance is the same as that of the pair of front and rear holding units constituting the film holding unit C described above. The pair of components before and after that are supported by the mounting frames 17, 17 ', respectively.
The mounting frames 17, 17 'are supported via connecting members 19, 19' on two guide rods 18, 18 'arranged at right angles to the lower side of the mounting frames 17, 17'. The mounting frame 17 'on which one feed means D1 is mounted is fixed, and the mounting frame 17 on which the other feed means D2 is mounted is configured to be movable along guide rods 18, 18'. D2 is connected to a distance expanding means (not shown) so that the distance between the distance D2 and the fixed-side feeding means D1 can be adjusted.

The pair of upper and lower endless elastic belts 14 and 14 'constituting the above-mentioned feeding means are driven and rotated in the same direction so that the film can be pinched and conveyed. The drive roller 14a 'around which the elastic belt 14' is wound, and the drive roller 14a '
The power is transmitted by winding the chain over a chain sprocket (not shown) fixed to the shaft of the drive roller 14a and a chain sprocket (not shown) fixed to the shaft of the drive roller 14a around which the upper elastic belt 14 is wound. And the upper elastic belt 14 is also configured to rotate. The upper and lower elastic belts are provided with a tension adjusting mechanism on the way to stably and reliably hold and transport the film.

The clamp plate 15 for pressing the lower elastic belt 14 'against the upper elastic belt 14 is divided into five, as shown in FIG. 5, and the five clamp plates are connected to the central clamp plate 15a. , The first clamps disposed on the left and right of the central clamp plate 15a.
Left and right clamp plates 15b, 15b ', and second left and right clamp plates 15c, 15c' disposed outside the first left and right clamp plates 15b, 15b '. Are located. The five clamp plates are second left and right clamp plates disposed outside.
The lengths of the first left and right clamp plates 15b, 15b 'and the central clamp plate 15a, which are disposed inside the lengths of the first and second clamp plates 15c, 15c', are shorter.

Further, the clamp plate 15 divided into five parts has its central clamp plate 15a disposed substantially at the center of the packaging position, and the other parts are disposed at symmetrical positions with respect to the central clamp plate 15a. Each of the five divided clamp plates 15 is independently driven by an electromagnetic solenoid or the like, pressed against the lower elastic belt 14 'and separated from the lower elastic belt 14'. . Therefore, the above 5
The release timing of the divided clamp plates 15 can be changed separately. For example, the film is released in accordance with the order of folding of the film (the progress of the left and right folding plates 10, 10 '), and the second left and right clamping plates 15c, 15c', which are generally arranged in front and rear in the width direction of the film. First left and right clamp plates 15b, 15b '→ rear center clamp plate 15a →
The front central clamp plate 15a is released in this order. (See Fig. 6)

FIG. 3 shows a mounting displacement / dimension detecting means B for measuring the mounting displacement of the product G placed on the product mounting table a and the width dimension of the product which is the basis for determining the length of the film drawn out. As shown in FIG. 2, two reflection-type optical sensors 1 are disposed in the vicinity of the product mounting table a in the product loading section at positions equidistant L from the center O of the width of the mounting table toward the outside in the width direction. , 1 'and its reflective optical sensor 1, 1'
And the moving means 2 for moving the light in the width direction of the product. The reflection type optical sensors 1 and 1 'include a light emitter and a light receiver, and determine whether the reflected light of the emitted light is received by the light receiver. Thus, it is configured to detect whether or not the displacement is equal to or more than a predetermined amount. That is, the reflection type optical sensor 1 on the right side
Is ON and the left reflective sensor 1 'is OFF, it is detected that the right reflective sensor 1' is off by more than a predetermined amount, and the right reflective optical sensor 1 is OFF and the left reflective sensor 1 'is OFF.
If it is N, it is detected that it is shifted to the left by a predetermined amount or more. The above sensor measures the width dimension of the product G in conjunction with the detection of the displacement, so that if the emitted light is reflected by the product and the reflected light is received by the light receiver, the width of the product is reduced. It is measured and if there is no reflected light, the width limit is confirmed. (FIGS. 9 to
(See 11)

The moving means 2 for moving the two reflection-type optical sensors 1, 1 'in the width direction of the product G is
As shown in FIG. 1, the reflection type optical sensor 1 is provided on the forward side (upper side) of the belt 202 wound around the stepping motor 201 of the driving source and the driven pulley, and the reflection type optical sensor is provided on the return side (lower side). 1 'is fitted to guide rods 203, 203', respectively, and is attached via sliding bodies 204, 204 'which slide in the left-right direction. Position) and a limit switch 205 'for detecting the limit position of the movement. The origin position (initial position) of the two reflection-type optical sensors 1 and 1 'is near the position corresponding to the center in the width direction of the carry-in portion, and the position is the narrowest among the products handled. When a product is placed on the product mounting table a, the distance required to move the reflective optical sensor 1, 1 'for dimension measurement is shortened by setting the position to be several tens of mm narrower than the width thereof, and the time required for measurement is reduced. The advantage is that it can be shortened. The movement of the reflection type optical sensors 1 and 1 'is started at the same time as the movement of the pusher 6, and the pushers 6 at both ends are moved until the position of the pusher 6 moves from the position of the solid line to the position of the virtual line in FIG. It is a moving speed that allows it to be located outside of the vehicle. Therefore, the measurement can be performed in a short time without the pusher 6 being in the way.

FIG. 7 is an electrical configuration diagram of the above-described packaging machine.
Control of various operations in the packaging machine is performed by microcomputer control. In the figure, reference numeral 21 denotes a CPU (central processing unit) constituted by a microcomputer.
, A ROM 23, a RAM 24, an operation unit 25, a display unit 26, a weighing unit 27, a printing unit 28, and a packaging machine control unit 29 are connected. A control program executed by the CPU 21 is stored in the ROM 23, and product data (for label printing and packaging machine control) preset for each product is stored in the RAM 24, and the CPU 21 executes the program in the ROM 23. During execution, the data is temporarily stored. The operation section 25 is for inputting various commands and data, and the display section 26 is for inputting commands and data input from the operation section 25 or RA.
In addition to displaying the data stored in the M24 or the operation status of the apparatus, various operations and error messages are displayed in characters and graphics. The weighing unit 27 is a weighing dish in which the product placing table a in the packaging machine is a weighing dish. The weight signal of the product placed on the placing unit is output to the CPU 21. Is printed and affixed to the product. The packaging machine control section 29 conceptually shows the entire packaging mechanism section controlled by the CPU 21. If directly related to the present invention, the width sensor circuit 30, the width sensor drive section 31, the transport conveyor drive section 32,
Elevator drive unit 33, film feed means drive unit 34,
A left / right folding plate driving unit 35, a rear folding plate driving unit 36, a discharge pusher driving unit 37, a clamp plate driving unit 38, and the like are provided.

The width sensor circuit 30 outputs detection signals of the right reflection type optical sensor (R) 1 and the left side reflection type optical sensor (L) 1 ′ to the CPU 21.
Is for driving a motor M1 (stepping motor 201) of a drive source for moving the sensor in accordance with a command from the CPU 21, and a transport conveyor driving unit 32 is for driving a motor M2 for driving the transport conveyor 3 in accordance with a command from the CPU 21. is there. The elevator driving unit 33 drives a motor M3 as a driving source for raising the elevator 4 according to a command from the CPU 21.
Motor M which is a driving source for film transport in response to U21 command
4 for driving the (motor 20 with reduction gear).

Next, the outline of the control in the above-mentioned apparatus is shown in FIG.
This will be described with reference to the flowchart of FIG. (Step 1) When the product is placed on the mounting table (weighing dish), the weighing of the product is started. (Step 2) When the weighing is stabilized, the loading of the goods is started. (Step 3): At the start of loading and at the time of loading, the size (length, width, height) of the product and the amount of displacement of the product are detected. (Step 4)... The timing of each operating section is determined based on the data detected in (Step 3). (Step 5) Each of the operating sections is operated at the timing detected in (Step 4) to execute the packaging operation. (Step 6) ... The packed product is carried out to the heat sealing section (discharge path) by the operation of the discharge pusher. (Step 7) A price label is affixed to the product during or after unloading. The price printed on the price label is obtained by multiplying the weight measured in (Step 1) by the unit price set in advance.

FIG. 8 is a time chart (mechanical time chart) of the operation of each part relating to standard product packaging when the product placed on the product mounting table a is not shifted in the width direction. . The control of each part in the packaging machine is performed based on the rotation angle of the cam 39 for driving the elevator. When the cam 39 makes one rotation, one cycle of packaging is performed. The rotation angle of the cam is detected by counting output pulses from the rotary encoder 40 attached to the cam shaft, and detecting the count value.
The gist of the present invention includes the above-described steps (step 3) and (step 4), and the following description will discuss them.

In step (3), the size L (width), W (length), H (height) and the amount of deviation ΔL of the product G are detected. W and H are detected by the sensor 3a while the product is being carried in, and the lateral width L and the deviation amount ΔL are determined by the right and left reflection type optical sensors (R) constituting the placement deviation and dimension detection means B.
1, (L) 1 'is determined by the detection results LR and LL. (See FIG. 13) Width L = LL + LR Deviation ΔL = 1/2 × (LR−LL) Conventionally, the timing data of each operation unit determined by the size (L, W, H) of the product is as follows: (a) The cut length of the film is basically determined by L (width). However, H (height)
Is more than a predetermined value, it is determined by L and H. (If L → Large, Cut length → Large. However, If H is greater than a predetermined value, the cut length is increased by one rank.) (B) Prestretch amount W (length) and H (height) It is determined. (In the case of W, H → large, pre-stretch amount → large) (c) Entry amount of left and right folding plates is determined by L (width). (In case of L → Large amount →
(Small) (d) Operation timing of rear folding plate Determined by W (vertical width). (If W → large, timing is late.) (E) Operation timing of discharge pusher Determined by W (vertical width). (When W → large, timing is late) (f) Release timing of film clamp Determined by L (width) and H (height). Of each item.

If there is a misalignment of the product,
With respect to the deviation amount ΔL, control of each item of (a) film centering position (b) operation timing of the left and right folding plates (c) stop timing of the left and right folding plates (d) release timing of the film clamp is changed. Hereinafter, the change will be described in detail. (A) As shown in FIG. 14, when the distance from the center N of the packaging part b to the cutter E is P, when the film length M (which is determined by L and H) is determined, the film length M The distance K traveled for centering the film (centering the film on the center N of the wrapping portion) is K = (M / 2) + (PM) = P- (M / 2). Here, for example, if the product is displaced by ΔL to the right, the distance K ′ is K ′ = [(M / 2) −ΔL] + (P−ΔL−M) to align the center of the film with the center of the product. ) = [P− (M / 2)] − 2ΔL = K−2ΔL That is, the center of the product can be made to coincide with the center of the product by moving by [distance K]-[2ΔL] determined by the film length M.

(B) As shown in FIG. 15, even when the center of the product G is shifted by ΔL from the center N of the packaging portion b, the left folding plate FL (10) and the right folding plate FR (10 ') are At the same time at the left end TL and right end TR. For that purpose, the moving speed of the left and right folding plates
Then, (1) the operation timing of the left folding plate FL is made earlier by ΔL / V than that of the right folding plate. (2) Alternatively, the operation timing of the right folding plate FR is delayed by ΔL / V from the operation timing of the left folding plate FL. (C) As shown in FIG. 16, the amount of entry N of the left and right folding plates when there is no misalignment of the product is determined by the width L of the product. That is, when there is no misalignment of the product, the moving amount of the left folding plate FL and the right folding plate FR is [R- (N / 2)], and the moving time is [R- (N / 2)] / V. . Note that R is the distance from the center N of the packaging portion b when the left and right folding plates are at the initial position. Therefore, when the distance is shifted by ΔL to the right, the moving amount of the left folding plate FL is set to [R− (N / 2) + ΔL].
That is, the moving time is [R− (N / 2) + ΔL] / V, and the moving amount of the right folding plate FR is [R− (N /
2) -ΔL], that is, the moving time of [R− (N / 2) −
ΔL] / V.

(D) As shown in FIG. 17, the release timings of the film clamps are the product size L (width) and H, respectively.
(Height). 5 if there is no misalignment
The front and rear second left and right clamp plates I and I 'of the split clamp plate operate at the same timing, the front and rear first left and right clamp plates II and II' operate at the same timing, and the front and rear second right and left clamp plates I and I '. , I ′ → the first left and right clamp plates II, II ′ → the rear center clamp plate III → the front center clamp plate III ′. The film clamp plate is released in the process of folding the film by the left and right folding plates. The later the release timing, the stronger the film tension. If the product has a displacement and is ΔL shifted, the front and rear second left and right clamp plates and the front and rear first
The release timing of the left and right clamp plates is changed in accordance with the operation timing of the left and right folding plates. That is, if the release timing of the front and rear second left and right clamp plates is T1 and the release timing of the front and rear first left and right clamp plates is T2 and the operation timing of the left folding plate FL is ΔL / When V is slowed, the release timing of the second left clamp plate and the first left clamp plate is set to T1-(ΔL /
V). Conversely, when the operation timing of the right folding plate FR is delayed by ΔL / V, the release timing of the second right clamp plate and the first right clamp plate is set to T1 + (ΔL /
V). As described above, when there is a misalignment of the product, the misalignment amount ΔL is detected, and the control of (a), (b), (c), and (d) is changed to perform the above. In addition, it is possible to eliminate the influence of the mounting displacement and to finish the packaging at a certain level or more.

In the above-described embodiment, the film is pre-stretched in the width direction by an amount corresponding to the product size H (height) and W (length), so that a single film can be used to package products of different sizes. Yes, but not limited to this packaging machine. Also, the control of each operating part is changed according to the size L, W, H of the product, but only L (width) or L (width)
And W (vertical width), the control of each operation unit may be changed. Further, in the embodiment, the product size L,
Although W and H are detected by the sensors, they may be preset for each product. Further, the embodiment is a case in which the present invention is implemented without substantially changing the configuration of a conventional apparatus, but the present invention is not limited to this, and the following modified examples can be considered. For example, the left and right folding plate unit, the film clamp unit, and the elevator unit are configured to be slidable in the left and right direction, and these units are moved according to the amount of deviation. That is, the configuration is such that the center N of the packaging portion b is moved according to the amount of deviation. This configuration has a complicated mechanism, but the effect becomes clearer.

Further, as previously proposed by the present applicant, when the displacement amount ΔL is large, the start-up of the apparatus may be prohibited or stopped. In this case, the shift amount ΔL to be prohibited or stopped may be determined for each product based on the preset or the length L of the product. Further, the control of the label attaching device may be changed according to the amount of deviation.
In the present embodiment, the worker places the product on the mounting table. However, the present invention is naturally included in the case where the product is automatically placed on the mounting table using a conveyor or the like. That is.

[0030]

According to the stretch film wrapping machine of the present invention, the control of the operating part in the wrapping machine is changed and adjusted by the amount of misalignment of the product by the structure described in the claims.
Even if packaging is carried out with a displacement, the packaging finish is not deteriorated as compared with the conventional case, and a packaging finish of a certain level or more can always be obtained. Even if the mounting position is slightly displaced, it does not affect the packaging finish, so that the operation of mounting the product is simplified, and improvement in work efficiency can be expected. Further, since there is no need to provide a centering device or the like, the size and weight of the device and the cost can be reduced. Further, according to the configuration of claim 6, when the amount of displacement is more than a predetermined value, the packaging operation is not performed, so that the packaging finish is deteriorated, the product is clogged in the packaging machine, and the product is damaged. Not only that, but that fact is notified, so that the worker can immediately recognize that the mounting method was bad and learn the correct mounting method.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view schematically showing a stretch film packaging machine according to the present invention.

FIG. 2 is a vertical sectional front view of FIG.

FIG. 3 is a plan view showing a product loading section.

FIG. 4 is a partially cut-away enlarged side view showing a state in which the transport conveyor stops at an initial position and a placement deviation and a lateral width are detected by a reflection type optical sensor.

FIG. 5 is a schematic plan view showing an arrangement relationship among a film clamp plate, left and right folding plates, and a rear folding plate.

FIG. 6 is an explanatory view showing a released state of the clamp plate.

FIG. 7 is an electrical configuration diagram of the present apparatus.

FIG. 8 is a time chart showing an outline of an operation of each operation unit in the present apparatus.

FIG. 9 is an explanatory diagram of an operation of a sensor for measuring a width dimension of a product, and is an explanatory diagram showing an origin position of the sensor.

FIG. 10 is an explanatory diagram showing a moving state of a sensor.

FIG. 11 is an explanatory diagram showing a state where the width measurement is completed.

FIG. 12 is a flowchart illustrating an outline of an operation of the present device.

FIG. 13 is an explanatory diagram showing a state of a product displacement.

FIG. 14 is an explanatory diagram showing centering of a film when there is a mounting displacement.

FIG. 15 is an explanatory diagram illustrating a relationship between a misplaced product and a left / right folded plate.

FIG. 16 is an explanatory diagram showing the amount of entry of the left and right folding plates with respect to a product having no displacement.

FIG. 17 is an explanatory diagram of a release timing of the clamp plate.

[Explanation of symbols]

 A: Machine frame B: Mounting displacement / dimension detecting means C: Film holding means D: Film feeding means G: Commodity a: Commodity placing section b: Packaging section 3: Conveyor 4: Elevator 10, 10 ': Left and right folding Plate 15 ... Film clamp plate

Claims (6)

(57) [Claims] An article placed on an article placing table is conveyed under a packaging section, a film cut to a predetermined length is transferred to a packaging section and stretched, and the article is pushed up toward the film to push up the article. In an elevator type stretch film packaging machine that covers the upper surface of the product with the film and folds the end of the film into the bottom of the product, (a) the standard of the device in the direction perpendicular to the transport direction of the product placed on the product mounting table (B) adjusting means for changing the control of the packaging machine based on the amount of displacement detected by the detecting means. Stretch film packaging machine. 2. The stretch film packaging machine further comprises a width dimension detecting means for detecting a length dimension in a direction perpendicular to a conveying direction of the product, and at least a part of operation of each operation section of the packaging machine. The stretch film packaging machine according to claim 1, wherein the timing of the stop is determined based on the detection results of the width dimension detecting means and the deviation amount detecting means. 3. A film feeding means mounted on the stretch film packaging machine for centering a film changes the centering position in accordance with an amount of shift detected by the shift amount detecting means, and adjusts the centering position in a width direction of the product. 2. The stretch film packaging machine according to claim 1, wherein the adjusting means is adjusted by the adjusting means so that the center and the center in the longitudinal direction of the film substantially coincide with each other. 4. The operation of the left and right folding plates for folding the end of the film mounted on the stretch film packaging machine into the bottom of the product according to the amount of deviation detected by the deviation amount detecting means. 2. The stretch film packaging machine according to claim 1, wherein the adjustment means is adjusted so that the timing and the amount of the left and right folding plates entering the bottoms of the left and right ends of the product are substantially the same. 5. A film clamping means for sandwiching both edges in the width direction of a film stretched on a wrapping portion provided in the stretch film wrapping machine is divided into three or more along the length direction of the film. The timing of releasing the film holding by the film clamping means is changed in accordance with the amount of shift detected by the shift amount detecting means, and at least the release timing of the film holding on the shifted side is changed to the other side film. 2. The stretch film packaging machine according to claim 1, wherein the right and left tension of the packaged product is adjusted to be substantially equal by setting the release timing earlier than the clamping release timing. 6. A notifying means for prohibiting the start of the apparatus or stopping the operation of the apparatus when the amount of the shift detected by the shift amount detecting means is equal to or greater than a predetermined value, and alerting the user of the fact. The stretch film packaging machine according to any one of claims 1 to 5, wherein