JP4070997B2 - Packaging apparatus and initial setting method in packaging apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging apparatus and an initial setting method in the packaging apparatus, and in particular, a packaging apparatus that performs a packaging operation in which a package is pressed against a film held in tension and a peripheral portion of the film is folded to the bottom side of the package. About.
[0002]
[Prior art]
A so-called stretch wrapping apparatus is widely known as an apparatus for covering and sealing an object to be packaged such as fruits and vegetables or food on a tray with a film. In this stretch wrapping apparatus, the object to be packaged is wrapped with the film by pushing up the object to be wrapped against the tensioned film, folding the periphery of the film to the bottom side of the object to be packaged, and heat-sealing.
[0003]
In such a stretch wrapping apparatus, in order to hold the film in tension, a clamp that holds both ends of the film is provided. After the film is gripped by these clamps, before the object to be packaged is pushed up against the film, the packaging apparatus moves the clamp outward so that the film extends. As a result, the film is held in tension without wrinkles. In general, this operation of moving the clamp holding the film outward to stretch the film is called a pre-stretch operation.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional stretch wrapping apparatus, the clamp is disposed at a position where both ends of the film can be gripped, and the prestretching operation is performed after the both ends of the film are gripped by the clamp. Depending on the packaging device, the position of the clamp is changed depending on the film length so that the clamp can hold the end of the film even when the film length (width or depth) changes. Is also present. In such a packaging apparatus, the position of each clamp is changed from the film length data, and control is performed so that the clamp always holds the end of the film.
[0005]
However, depending on the length of the article to be packaged, it may be necessary to move the clamp in a state of gripping the film edge for prestretching. In such a case, if the method of always gripping the end of the film as described above is adopted, a sufficient amount of pre-stretch cannot be secured due to the limitation of the movable range of the clamp, or the clamp in the pre-stretch operation It is conceivable that the movement distance of is larger than necessary. For example, when packaging a small package using a wide film, if the clamp is holding the edge of the film, not only the part of the film directly above the package, Since the pre-stretching operation will be performed, the distance that the clamp must move to obtain the required pre-stretch amount is not secured even if the clamp is moved outwards to the full extent. Will become bigger.
[0006]
An object of the present invention is to provide a packaging device that can ensure a sufficient amount of pre-stretching with a small amount of movement when performing a pre-stretching operation (operation for holding a film in tension).
[0007]
[Means for Solving the Problems]
A packaging apparatus according to claim 1 is an apparatus that performs a packaging operation of pressing a package object against a tension-held film and folding a peripheral portion of the film to a bottom side of the package object. The packaging device includes a first clamp, a second clamp, a clamp moving mechanism, and a control unit. The first clamp can grip the first side of the film. The second clamp can grip the second side of the film facing the first side. The clamp moving mechanism moves the first and second clamps in a direction connecting the first and second clamps. The control unit controls the clamp moving mechanism based on the length in the direction connecting the first and second clamps of the package before the package operation or before pressing the package against the film in the package operation. The Adjust the distance from the film ends of the first and second clamps .
[0008]
In this packaging apparatus, since the first and second side portions of the film facing each other are held by the first and second clamps, the first and second clamps are separated from each other before the film is pressed against the package. It is possible to perform an operation (pre-stretch operation) for moving the film in the direction and holding the film in tension. Thereby, it becomes possible to cover a to-be-packaged object with a film with few wrinkles.
[0009]
And here, based on the length of the direction in which the first and second clamps of the article to be packaged are connected (hereinafter abbreviated as the length of the article to be packaged), the clamp moving mechanism is controlled to control the first and second clamps. of Adjust the distance from the film edge ing. Therefore, when the length of the package is short, the first and second clamps can grip the film at a portion closer to the package than the film end. In this way, if the length of the package is short and the clamp is adjusted so that the part close to the package is gripped, a sufficient amount of pre-stretch can be secured with a small amount of movement in the pre-stretch operation. Will be able to.
[0010]
That is, when the positions of the first and second clamps are determined so as to always grip the film end from the film length, a sufficient amount of pre-stretching is obtained when the film length is long and the length of the package is short. The distance that the clamp must move before obtaining the required pre-stretch amount may be increased, but here the first and second clamp positions depend on the length of the package. Therefore, it is possible to ensure a sufficient amount of pre-stretching with less movement in the pre-stretching operation.
[0011]
A packaging device according to a second aspect is the packaging device according to the first aspect, wherein the control unit is configured so that the first and second clamps are relative to each other based on a length in a direction in which the first and second clamps of the film are connected. A maximum allowable value of the distance is determined, and the clamp moving mechanism is operated so that the relative distance between the first and second clamps does not exceed the maximum allowable value.
[0012]
Here, the position of the first and second clamps is not adjusted based only on the length of the object to be packaged, but the length in the direction connecting the first and second clamps of the film (hereinafter abbreviated as the film length). .) Is also taken into consideration, and the first and second clamp positions are adjusted so as not to exceed the maximum allowable value determined from the film length.
[0013]
A packaging device according to a third aspect is the packaging device according to the first or second aspect, wherein the control unit is configured to reduce the first and first lengths in a direction in which the first and second clamps of the packaged object are connected. The clamp moving mechanism is controlled so that the relative distance between the two clamps becomes small.
[0014]
Since the first and second clamps always hold the same part (both ends) of the film, when the length of the package is reduced, the film is stretched by pre-stretching to the part of the film that does not need to be stretched. This wastes. That is, if the clamp is not moved more than necessary, a sufficient pre-stretch amount cannot be ensured, and the time required for the pre-stretch operation becomes long.
[0015]
On the other hand, in the apparatus according to claim 3, since the relative distance between the first and second clamps is reduced as the length of the packaged item is shortened, the portion of the film stretched unnecessarily is reduced, and the number of clamps is reduced. The pre-stretching operation can be completed with this movement.
[0016]
Claim 4 The initial setting method in the packaging apparatus according to the present invention is the initial setting in the packaging apparatus having a packaging operation of pressing the object to be packaged against the film in a state where both sides of the opposing film are gripped by the first and second clamps and prestretched. It is a method. This method includes a first step and a second step. In the first step, the length of the packaged object in the direction in which the first and second clamps are connected is obtained. In the second step, the first and second clamps are moved in the direction connecting the first and second clamps according to the length of the package, and the initial positions of the first and second clamps are corrected. And adjusting the distance from the film end of the first and second clamps .
[0017]
In this method, the initial positions of the first and second clamps are corrected according to the length of the article to be packaged. Therefore, when the length of the package is short, the first and second clamps can grip the film at a portion closer to the package than the film end. In this way, if the length of the package is short and the clamp is modified so that the portion close to the package is gripped, a sufficient amount of pre-stretch can be secured with a small amount of clamp movement in the pre-stretch operation. become able to.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
<Overall configuration and general operation>
A schematic side view, front view, and plan view of a stretch wrapping apparatus according to an embodiment of the present invention are shown in FIGS. Moreover, the control block of the stretch wrapping apparatus 10 is shown in FIG. The stretch wrapping device 10 is a small weighing and packaging device, and is designed to wrap fruits and vegetables with note trays or to wrap foods (products) such as fruits and vegetables contained in soft trays. However, even a product placed on a normal foam tray can be packaged.
[0019]
The stretch wrapping apparatus 10 has a weighing function and a function with a value (a label creation function including a measurement value and a price), but here, the description will be made focusing on the wrapping function of the stretch wrapping apparatus 10.
[0020]
The stretch wrapping device 10 is a device in which each mechanism is attached to the main body frame 15, and mainly includes a product introduction mechanism 20, a lift mechanism 30, a film transport mechanism 40, a film holding mechanism 50, and a film pushing mechanism. 60, a film film right and left folding mechanism 66, and a heat seal and film front and rear folding mechanism 70 are provided.
[0021]
When the product G (see the product G on the front side in FIG. 1) is placed on the introduction table 21 of the product introduction mechanism 20 by the operator's hand, the product G is lifted after the product G is weighed by the measuring instrument 29. It is sent to the mechanism 30 (see the commodity G on the rear side of FIG. 1). On the other hand, the film F transported above the lift mechanism 30 by the film transport mechanism 40 is pre-stretched in a state where the front and rear, right and left ends are gripped by the film holding mechanism 50 (see FIG. 10B). When the product G supported by the lift mechanism 30 is pushed up with respect to the pre-stretched film F, the product G is in a state where the upper side and the side are covered with the film F with the film F pushed up (see FIG. 10 (c)).
[0022]
Thus, the peripheral part of the film F covering the upper side and the side of the product G is folded to the bottom side of the product G by the left and right pushing members 61 and 62 and the rear folding plate 71 (see FIG. 10E). Before this folding operation, the left and right folding plates 64 and 65 enter the vicinity of the left and right ends of the bottom of the product G and play a role of supporting the bottom of the product G together with the lift mechanism 30. The film F folded on the bottom side of the product G receives heat input from the nichrome wire 81 attached to the front fixing member 72 while being sandwiched between the rear folding plate 71 and the front fixing member 72. Then, heat sealing is performed (see FIG. 13D).
[0023]
The product G thus wrapped with the film F including the heat seal is taken out by an operator's hand, and a label discharged from a pricing mechanism (not shown) is attached.
[0024]
<Composition of product introduction mechanism 20>
As shown in FIGS. 1 and 4, the merchandise introduction mechanism 20 mainly includes an introduction table 21, an introduction table vertical movement motor 22, and an introduction table longitudinal movement motor 23. The introduction table 21 supports the product G by a plurality of support plates 21a arranged in the left-right direction. These support plates 21a and support members 34a, 34b, 35a (described later) of the lift mechanism 30 shown in FIG. A measuring instrument 29 for measuring the weight of the commodity G placed on the introduction table 21 is disposed below the introduction table 21. The introduction table 21 is connected to an introduction table longitudinal movement motor 23 via a belt, a pulley, or the like, and moves back and forth by the operation of the introduction table longitudinal movement motor 23. Further, the entire longitudinal movement unit including the introduction table 21 and the introduction table longitudinal movement motor 23 is configured to move up and down by the introduction table vertical movement motor 22.
[0025]
When each motor 22 and 23 of the product introduction mechanism 20 is actuated by a command from the control unit 90 to be described later, the introduction table 21 performs a rectangular motion, and the product G placed on the introduction table 21 by the walking beam method is moved to the rear side. It is sent onto the support members 34a, 34b, 35a of the lift mechanism 30.
[0026]
<Configuration of lift mechanism 30>
The lift mechanism 30 is provided to support the bottom of the product G sent from the product introduction mechanism 20 and lift the product G upward. Further, the lift mechanism 30 plays a role of supporting the bottom of the product G even when the peripheral portion of the film F is folded to the bottom side of the product G, as will be described later.
[0027]
As shown in FIGS. 1, 2, 4 and 5, the lift mechanism 30 mainly includes a vertical rail 30a arranged on the left and right sides, a slider 31a that moves up and down along the vertical rail 30a, and a link mechanism 30c. The lift motor 30d moves the slider 31a up and down via the link mechanism 30c, the first base 31 mounted on the slider 31a, and the small rail 31b extending downward from the upper center of the first base 31 up and down. And a second base 32 that moves. The lift mechanism 30 includes a regression mechanism and a time difference descending solenoid switch 37.
[0028]
The link mechanism 30c rotates around the pin support portion 30b by the operation of the lift motor 30d, and moves the slider 31a and the first base 31 up and down along the vertical rail 30a.
[0029]
[First base 31]
As shown in FIGS. 5 and 7, the first base 31 is formed integrally with the slider 31a, and includes a left and right support member 34a and a central front and rear support member 34b. The first base 31 has a left and right divided portion, and a support member 34a (or 34b) extends upward from each divided portion one by one. In the left and right support members 34a, the upper surface that supports the product G is a horizontal plane, and three each are arranged on the left and right. Each of the left and right support members 34a has a structure in which the upper part can be collapsed inward. When the left and right folding plates 64 and 65 and the left and right pushing members 61 and 62, which will be described later, come into the middle, It falls inward by the force that acts from etc. On the other hand, the center front / rear support member 34b extends upward from the center of the first base 31 divided into seven parts, and does not fall down. The center front and rear support member 34b plays a role of supporting a central portion in the left-right direction of the product G together with the center support member 35a described later, but forms a concave shape in a side view combined with the center support member 35a. Is stably supported (see FIG. 5A). The center front / rear support member 34b supports a front portion and a rear portion of the center portion of the product G in the left-right direction.
[0030]
The two small rails 31 b extend downward from the upper center of the first base 31. The small rail 31b is provided to vertically move the left and right support members 34a and the center front / rear support member 34b fixed to the first base 31 and the center support member 35a pin-supported by the second base 32. Yes.
[0031]
[Second base 32]
The second base 32 has a slide portion 32a, which is a rear portion, engaged with the small rail 31b so as to be slidable up and down. Therefore, the second base 32 can move up and down relatively with respect to the first base 31. The lower ends of the two small rails 31b are connected by a member for preventing the slide portion 32a of the second base 32 from falling off the small rail 31b. A stopper bolt is attached to a member connecting the lower ends of the two small rails 31b, and the head of the bolt supports the lower surface of the slide portion 32a of the second base 32 from below. For this reason, when the slider 31a and the 1st base 31 raise, the 2nd base 32 will also raise.
[0032]
The second base 32 supports the central support member 35a by four link bars 35b. The center support member 35a is two plate-like members for supporting the center portion of the bottom of the product G. As shown in FIG. 5, the upper surface of the central support member 35a is concave in a side view. The upper part of the link bar 35 b is pin-bonded to the central support member 35 a, and the lower part is pin-bonded to the second base 32. These link bars 35 b serve to move the central support member 35 a back and forth by a predetermined distance with respect to the second base 32. That is, the central support member 35a is configured to move back and forth within a predetermined range with respect to the second base 32 fixed in the front-rear direction (see FIGS. 5B and 5C).
[0033]
An extension member 32b extends downward from the rear end of the slide portion 32a of the second base 32. The lower end of the extension member 32b is bent backward to form a horizontal portion 32c. The horizontal portion 32c is supported from below by a shaft 37a of a solenoid switch 37 described later when the peripheral portion of the film F is folded to the bottom side of the product G (see FIG. 5A).
[0034]
[Regression mechanism]
The return mechanism of the lift mechanism 30 includes a structure in which the second base 32 supports the central support member 35a so as to be movable back and forth via the link bar 35b, and a guide roller 36a provided at the front end of the first base 31. The The guide roller 36a is rotatably supported at the front end of the first base 31, and contacts the center of the front link bar 35b so that the center support member 35a does not move forward more than necessary. It plays a role of regulating movement (see FIG. 5C). Further, the guide roller 36a serves to guide the central support member 35a so as to return backward when the first base 31 is lowered first and the second base 32 is lowered later.
[0035]
When the second base 32 descends after the first base 31 descends first, a backward reaction force (reaction force against the downward inertia force of the central support member 35a) from the guide roller 36a to the front link bar 35b. Works. For example, in the state shown in FIG. 6A, a backward force acts on the link bar 35b from the guide roller 36a. Thereby, the center supporting member 35a returns to the original position backward (see FIG. 6B).
[0036]
Note that the stopper 32d works when the central support member 35a returns to the original front-rear position so that the central support member 35a does not move rearward more than necessary. The stopper 32d is provided at the front end of the second base 32, and prevents excessive rearward movement of the central support member 35a by restricting forward movement of the lower end of the rear link bar 35b.
[0037]
[Solenoid switch 37 for time difference lowering]
The time difference descending solenoid switch 37 of the lift mechanism 30 is fixed to the main body frame 15. The solenoid switch 37 operates immediately after the first and second bases 31 and 32 are raised to the highest point, and the shaft 37a supports the lower surface of the horizontal portion 32c of the second base 32 from the lower side (FIG. 5 ( a)). Thereby, even if the 1st base 31 descend | falls as shown in FIG.5 (b), the 2nd base 32 maintains the same height position until the solenoid switch 37 is turned off.
[0038]
<Configuration of film transport mechanism 40>
The film transport mechanism 40 is a mechanism for transporting the film F cut to a predetermined size above the product G supported by the lift mechanism 30 and holding the film F in tension. The film transport mechanism 40 mainly moves the roll holding part 41 that rotatably supports the film roll R, the front clamp 54 that holds the front end of the film F fed from the film roll R, and the front clamp 54 to move back and forth. And a front clamp moving mechanism. The front clamp moving mechanism includes a front clamp forward / backward movement motor 56a (see FIG. 4), a belt mechanism, a front clamp support member, and the like. Here, the front clamp 54 moves back and forth by operating the front clamp forward / backward movement motor 56a. The front clamp 54 grips or separates the front end portion of the film F by turning on / off the front clamp solenoid switch 56b shown in FIG.
[0039]
When a command to convey the film F is issued from the control unit 90, the front side clamp 54 moves rearward and grasps the leading end of the film F that is fed from the film roll R and reaches the vicinity of the rear side clamp 53. Then, the front clamp 54 moves forward with the front end of the film F being gripped, so that the film F is positioned above the lift mechanism 30.
[0040]
<Configuration of Film Holding Mechanism 50>
The film holding mechanism 50 mainly includes a front clamp 54 and a front clamp moving mechanism, which are also components of the film transport mechanism 40, a rear clamp 53 and a rear clamp moving mechanism, a left clamp 51, a right clamp 52, and a later-described film. It is comprised from the left-right pushing member moving mechanism which is also a component of the film pushing mechanism 60 to perform.
[0041]
The rear clamp 53 grips and separates the rear end of the film F by turning on and off the rear clamp solenoid switch 55b shown in FIG. 4, and moves back and forth by the rear clamp moving mechanism. The rear clamp movement mechanism includes a rear clamp forward / backward movement motor 55a (see FIG. 4), a belt mechanism, a rear clamp support member, and the like.
[0042]
As shown in FIG. 9, the left clamp 51 and the right clamp 52 are provided below left and right pressing members 61 and 62, which will be described later, and the film F is sandwiched between the left and right pressing members 61 and 62. Grip. That is, the left clamp 51 and the right clamp 52 move upward to grip the film F by contacting the left and right pushing members 61, 62, and move downward to leave the film F by moving away from the left and right pushing members 61, 62. Release the grip. Therefore, in order to move the left clamp 51 and the right clamp 52 up and down, as shown in FIG. 4, a left clamp up-and-down motor 51a and a right clamp up-and-down motor 52a are provided. When the left clamp vertical movement motor 51a and the right clamp vertical movement motor 52a operate, the left clamp support base 51b and the right clamp support base 52b that support the left clamp 51 and the right clamp 52 move up and down.
[0043]
The left clamp 51 and the right clamp 52 are supported by a left clamp support base 51b and a right clamp support base 52b so as to be movable left and right by a predetermined distance. Then, the left clamp 51 and the right clamp 52 can slightly move up and down with respect to the left clamp support base 51b and the right clamp support base 52b so that the left clamp 51 and the right clamp 52 do not draw an arcuate locus due to the left-right movement. It is configured as follows. Therefore, when the left and right push members 61 and 62 move to the left and right in a state where the left clamp 51 and the right clamp 52 are pressed against the left and right push members 61 and 62 from below, the left clamp 51 and the right clamp 52 follow the movement. . In other words, the left and right pushing member moving mechanism that moves the left and right pushing members 61 and 62 to the left and right also serves to move the left clamp 51 and the right clamp 52 to the left and right.
[0044]
The film holding mechanism 50 plays a role of gripping the peripheral portion of the film F when the product G is pushed up by the lift mechanism 30 and is in a state where the film F is stretched immediately before the product G is pushed up. Perform a pre-stretch operation. By this pre-stretching operation, the clamps 53, 54, 51, 52 holding the peripheral portion of the film F are horizontally moved outward, and the film F is stretched by a predetermined amount.
[0045]
<Configuration of film push-in mechanism 60>
The film pushing mechanism 60 includes left and right pushing members 61 and 62 and a left and right pushing member moving mechanism that moves the pushing members 61 and 62 to the left and right. The left and right pushing member moving mechanism includes a film pushing motor 63a shown in FIG. 4, a belt mechanism, a support member that supports the left and right pushing members 61 and 62, and the like. The film pushing motor 63a is operated by a command from the control unit 90, and moves the left and right pushing members 61 and 62 to the left and right.
[0046]
Further, the left and right pushing members 61 and 62 can grip the film F by sandwiching the film F between the left clamp 51 and the right clamp 52, and act as a part of the clamp. The left and right pushing members 61 and 62 are formed with long holes for strengthening the clamping action. Since the same applies to any of the pressing members 61 and 62, here, the elongated hole 61a formed in the left pressing member 61 shown in FIG. 9B will be described. The long hole 61 a is formed long in the front-rear direction, and has a size such that a protruding portion 51 c protruding upward from the upper surface of the left clamp 51 can be inserted. When the left clamp 51 moves upward and comes into close contact with the pushing member 61, the protrusion 51c of the left clamp 51 enters the long hole 61a, and the film F enters between the protrusion 51c and the long hole 61a. The movement of F in the left-right direction is strongly restricted. Thus, the presence of the protrusion 51c and the long hole 61a enhances the degree of gripping the film F by the clamp 51 and the pushing member 61.
[0047]
<Configuration of film left / right folding mechanism 66>
The film right / left folding mechanism 66 mainly includes left and right folding plates 64 and 65 and a left / right folding motor 68a (see FIG. 4) for moving the left and right folding plates 64 and 65 to the left and right. . The left and right folding motor 68a moves the folding plates 64 and 65 to the left and right via a belt mechanism, a support member that supports the folding plates 64 and 65, and the like.
[0048]
The left and right folding plates 64 and 65 are disposed above the left and right pushing members 61 and 62 and support the bottom of the product G during the film folding operation by the rear folding plate 71 described later.
[0049]
<Configuration of Heat Sealing / Film Front and Back Folding Mechanism 70>
The heat sealing and film front / rear folding mechanism 70 operates after the right and left ends of the film F covering the product G are folded under the product G, and the rear end of the film F is folded under the product G. This is a mechanism for sandwiching the film F under the product G and heat-sealing.
[0050]
The mechanism 70 mainly includes a rear folding plate 71 and a rear folding plate moving mechanism, a rear clamp 53 and a rear clamp moving mechanism (described above), a front fixing member 72, a front clamp 54 and a front clamp moving mechanism (described above). ) And a nichrome wire 81 and a thermistor 82 attached to the front fixing member 72.
[0051]
The rear folding plate 71 is disposed between the left and right pushing members 61 and 62 and the left and right folding plates 64 and 65 in the height direction, and folds the film F from the back to the bottom side of the product G and fixes the front side. The film F is sandwiched between the members 72 and a pressing force necessary for heat sealing is applied to the film F. The rear folding plate moving mechanism includes a rear folding plate moving motor 71a (see FIG. 4), a belt mechanism, a support member that supports the rear folding plate, and the like. When the rear folding plate moving motor 71a is actuated by a command from the control unit 90, the rear folding plate 71 moves back and forth.
[0052]
The rear folding plate 71 has a roughened front surface of the main body 71b in the range shown in FIG. 3 and a rough surface. Further, as shown in FIG. 8, a bakelite member 71 c is attached to the tip of the rear folding plate 71. The bakelite member 71c is made of a material having appropriate hardness, heat resistance, wear resistance, insulation, and the like. With such a configuration, the portion of the rear folding plate 71 that comes into contact with the film F when the film F is folded is in a state in which the film F is hardly adhered.
[0053]
The front side fixing member 72 is fixed to the main body frame 15. The front side fixing member 72 includes an aluminum plate 72a, a stainless plate 72b, and a roller 72c. The aluminum plate 72a is disposed at a position sandwiched between the stainless plate 72b and the roller 72c. A nichrome wire 81 is attached to the rear surface of the aluminum plate 72a (the surface facing the rear folding plate 71), and the nichrome wire 81 is more forward than the rear surface of the stainless steel plate 72b and the rear end of the roller 72c. The stainless steel plate 72b and the roller 72c are arranged so as to be retracted. The nichrome wire 81 (height dimension 2 mm) is attached to the rear surface (height dimension 5 mm) of the aluminum plate 72a via an insulating tape.
[0054]
In order to estimate the amount of heat applied to the film F from the nichrome wire 81 by measuring the temperature of the aluminum plate 72a, a thermistor 82 as a temperature sensor is embedded in the aluminum plate 72a.
[0055]
Furthermore, the aluminum plate 72 a is divided into two parts on the left and right sides, and absorbs the elongation corresponding to the thermal expansion of the nichrome wire 81.
[0056]
<Details of operation of stretch wrapping apparatus 10>
Next, of the operations of the stretch wrapping apparatus 10, the operation of folding the film F from the left and right to the bottom side of the product G and the operation of folding the film F from the rear to the bottom side of the product G and heat-sealing the film F are detailed. Explained.
[0057]
(Left / right folding and pushing)
As shown in FIG. 10A, when the film F is transported above the lift mechanism 30 by the film transport mechanism 40, the left and right clamps 51, 52 are lifted up and between the left and right pushing members 61, 62. To grip the left and right portions of the film F. At this time, the front and rear portions of the film F are also held by the front and rear clamps 53 and 54.
[0058]
Next, the left and right pushing members 61 and 62 and the left and right clamps 51 and 52 following them are opened outward, and the film F is pre-stretched in the left and right direction (see FIG. 10B). At this time, the film F is also prestretched in the front-rear direction.
[0059]
In this way, the lift mechanism 30 raises the product G placed on the support members 34a, 34b, and 35a with respect to the film F that has been pre-stretched and has no wrinkles, and creates a state in which the film F is pushed up by the product G ( (Refer FIG.10 (c)). At this time, the product G is in a state where the film F is covered upward by the film F with the film F pushed up.
[0060]
As shown in FIG. 10 (c), when the product G is in a state of pushing up the film F, the left and right folding plates 64 and 65 enter the inner side first, and the left and right pushing members 61 and 62 and The rear folding plate 71 also enters inside. The left and right folding plates 64 and 65 stop moving when they enter the inside to a position where the bottom of the product G can be supported. On the other hand, the left and right push-in members 61 and 62 and the left and right clamps 51 and 52 that follow the left and right push-in members 64 and 65 prevent the excessive tension from acting on the film F due to the movement of the left and right folding plates 64 and 65. Then, the left and right clamps 51 and 52 are lowered at an appropriate position to release the right and left portions of the film F (see FIG. 10D).
[0061]
Even after releasing the grip of the left and right portions of the film F, the left and right pushing members 61 and 62 continue to move inward to push the film F into the bottom side of the product G, and finally from the left and right folding plates 64 and 65. It moves to the inside and stops (see FIG. 10 (e)). FIG. 11 shows the positional relationship between the left and right folding plates 64 and 65 and the left and right pushing members 61 and 62, and the rear folding plate 71 and the front side fixing member 72 in plan view.
[0062]
In the left and right folding operation, the support of the product G by the lift mechanism 30 continues to be supported by the central front and rear support members 34b and 35a, and the left and right support members 34a support the left and right folding plates 64 and 65. Replaced by support by. When the left and right folding plates 64 and 65 enter the inside, the left and right support members 34a are pushed by the left and right folding plates 64 and 65 in order from the outside, and fall inward.
[0063]
[Post-folding operation and heat sealing operation]
The product G and the film F that are in the state shown in FIG. 10 (e) or FIG. 11 by the above left and right folding operation and pushing operation are in the state shown in FIG. 12 (a) in a side view. In the rear folding operation, the rear folding plate 71 first moves forward, and the rear clamp 53 moves forward with a slight delay. Thereafter, the rear clamp 53 moves forward in accordance with the movement of the rear folding plate 71 so that excessive tension does not act on the film F (see FIG. 12B).
[0064]
Then, when the rear folding plate 71 approaches the lift mechanism 30, the first base 31 is lowered, and the support of the product G by the central front and rear support member 34b is released (see FIG. 12C). At this time, the first base 31 is lowered by the lift motor 30d, but the time difference lowering solenoid switch 37 is maintained as it is, so that the second base 32 remains at the same height without being lowered. Therefore, for a while after the first base 31 is lowered, the product G is supported only by the central support member 35a supported by the second base 32 and the left and right folding plates 64 and 65.
[0065]
When the rear folding plate 71 further moves forward and hits the central support member 35a of the lift mechanism 30, it is pushed forward by the force from the rear folding plate 71 and the central support member 35a starts moving forward (FIG. 10 (d). )reference). Following this, the product G also starts moving forward. Further, as the central support member 35a and the product G move forward, the front clamp 54 moves rearward in order to keep the tension of the film F on the front side of the product G properly (FIG. 13 (a), ( b)). FIG. 14 shows a plan view of the rear folding plate 71 and the like when the central support member 35a moves forward while supporting the product G.
[0066]
When the center support member 35a of the lift mechanism 30 and the commodity G approach the front fixing member 72, the shaft 37a of the time difference descending solenoid switch 37 is retracted, and the second base 32 and the center support member 35a are lowered (FIG. 5 ( c), FIG. 6 (a), and FIG. 6 (b)). As a result, there is no obstruction of the rear folding plate 71 and the rear clamp 53 below the product G, and the rear folding plate 71 and the rear clamp 53 move further forward (FIG. 13B, ( c)). Also at this time, the product G that receives a forward force from the rear folding plate 71 via the film F slides on the left and right folding plates 64 and 65 and continues to move forward.
[0067]
Finally, the rear folding plate 71 hits the front fixing member 72, specifically, the bakelite member 71c of the rear folding plate 71 hits the nichrome wire 81 of the front fixing member 72, and the front film F and the rear side The film F is heat-sealed under the product G by the pressing force and heat input from the nichrome wire 81 (see FIG. 13D). Note that the grip of the film F by the rear clamp 53 and the front clamp 54 is released at the time of heat input from the nichrome wire 81 or just before that. This is to prevent a change in tension of the film F during heat input.
[0068]
Thereafter, the rear folding plate 71 and the rear clamp 53 return to the rear, and the product G covered with the film F and heat-sealed is supported by the front portions of the left and right folding plates 64 and 65. Become.
[0069]
<Configuration of Control Unit 90 and Characteristic Control by Control Unit 90>
The control unit 90 controls the operation of each mechanism 20, 30, 40, 50, 60, 66, 70 of the stretch wrapping apparatus 10. The control unit 90 includes a storage unit 91 such as a RAM.
[0070]
The storage unit 91 stores information about the product G and information about the film F collected by external input, manual input, or input from the measuring instrument 29 or the like.
[0071]
[Control on left and right folding and pushing operations]
The control unit 90 controls the film pushing motor 63a and the left and right folding motor 68a based on the control data including the property information of the product G and the film F in the storage unit 91, and the left and right pushing members 61, 62 and The movement amount and the movement timing of the left and right folding plates 64 and 65 are optimal for the product G and the film F. Control data includes data relating to whether or not the product G includes a tray, data relating to the shape of the product G or tray, data relating to the dimensions of the product G or tray, data relating to the rigidity of the product G or tray, and data relating to the size of the film F. Data, and data on the type of film F, etc., but here, film size, film type, tray depth / width / height, tray softness, product G shape (round, etc.), product Control data including information on the height of G, whether the product G is placed on a hard tray or a soft tray, or whether the product G is packaged without a tray is used.
[0072]
The timing for releasing the right and left portions of the film F in the left and right folding operation, that is, the timing for lowering the left and right clamps 51 and 52 is also controlled based on the above control data.
[0073]
[Control for back folding operation]
The control unit 90 controls the rear folding plate moving motor 71a, the rear clamp forward / backward movement motor 55a, and the front clamp forward / backward movement motor 56a based on the property information of the product G and the film F in the storage unit 91. Specifically, the rear clamp forward / backward movement motor 55a that moves the rear clamp 53 in accordance with the movement of the rear folding plate 71 by the rear folding plate moving motor 71a is controlled so that excessive tension does not act on the film F. In order to keep the tension of the front film F that changes due to the forward movement of the product G in an appropriate range, the front clamp forward / backward movement motor 56a that moves the front clamp 54 is controlled. Thereby, it is suppressed that excessive tension acts on the film F and a hole is opened in the film F or an excessive force acts on the product G.
[0074]
[Control for heat sealing operation]
When the front film F and the rear film F are sandwiched between the rear folding plate 71 and the front fixing member 72 below the product G, the control unit 90 has a large voltage or current (impulse) that lasts for a very short time. ) Is passed through the nichrome wire 81 to heat the film F. That is, here, an impulse seal that can change the amount of heat input to the heat seal portion with good responsiveness is employed.
[0075]
Then, the control unit 90 determines at least one of the current value, voltage value, number of times, and energization time of the impulse flowing through the nichrome wire 81 based on the temperature measured by the thermistor 82 embedded in the aluminum plate 72a of the front fixing member 72. To change. For this reason, the heat sealing of the film F can be performed with a heat input amount that is not excessive or insufficient.
[0076]
For example, when the temperature of the front fixing member 72 rises or falls due to a change in the surrounding environment, the temperature change is measured by the thermistor 82, so the nichrome wire 81 is controlled so that the heat seal is properly performed. be able to. Specifically, when the ambient temperature is low in winter, the temperature of the aluminum plate 72a is lowered, and the amount of heat necessary for heat sealing may be insufficient. Therefore, the impulse seal is controlled to compensate for this.
[0077]
<Position alignment of left and right clamps 51 and 52 before operation>
Here, the left and right clamps 51 and 52 are configured to move to the left and right following the left and right movement of the left and right pushing members 61 and 62. However, a drive mechanism that can independently move the left and right clamps 51 and 52 to the left and right is as follows. Not deployed.
[0078]
On the other hand, the applicant of the present application finds that it is desirable to appropriately determine the initial positions of the left and right clamps 51 and 52 based on the left and right width W3 of the film F and the left and right width W1 of the product G (see FIG. 9A). Have gained. In particular, when the width W3 of the film F is long and the width W1 of the product G is short, if the left and right clamps 51 and 52 are not arranged at appropriate initial positions, a sufficient prestretch amount cannot be secured in the left and right direction. The distance that the left and right clamps 51 and 52 must move to obtain the necessary pre-stretch amount may increase.
[0079]
In view of this, in the stretch wrapping apparatus 10, the distance W2 between the left and right clamps 51 and 52 (see FIG. 9A) is an appropriate value with respect to the width W3 of the film F and the width W1 of the product G. A method is adopted in which the operator determines the initial positions of the left and right clamps 51 and 52 in the left-right direction.
[0080]
Specifically, in the portion where the left clamp support base 51b and the right clamp support base 52b are fixed to the main body frame 15 in the left-right direction below, several steps are provided in the left-right direction, and the width W3 of the film F is set. In addition, the operator determines the fixed position using a table in the operation manual in which the fixed position can be derived from the width W1 of the product G. Therefore, when the width W3 of the film F or the width W1 of the product G changes, the fixing position for fixing the left clamp support base 51b and the right clamp support base 52b in the left-right direction changes, as indicated by an arrow A in FIG. The left and right positions of the left clamp support base 51b and the right clamp support base 52b change.
[0081]
<Characteristics of stretch wrapping device 10>
(1)
In the stretch wrapping apparatus 10, a left and right folding motor 68a for moving the left and right folding plates 64 and 65 is provided separately from the film pushing motor 63a for moving the left and right pushing members 61 and 62, and the product G or the like Both motors 63a and 68a are controlled on the basis of control data comprising information relating to the properties of the film F. Therefore, here, the movement of the left and right pushing members 61 and 62 and the movement of the left and right folding plates 64 and 65 can be controlled separately. Appropriately adjust when the pushing members 61 and 62 start to move, and the amount of movement of the left and right pushing members 61 and 62 and the amount of movement of the left and right folding plates 64 and 65 in accordance with the properties of the product G and film F Have been able to.
[0082]
Thereby, when the film F and the goods G change, the cooperation of the movement of the left and right pushing members 61 and 62 and the left and right folding plates 64 and 65 is out of an appropriate range, and the desired tension of the film F is obtained. The trouble of not being is suppressed.
[0083]
Here, since the left and right pushing members 61 and 62 have a role of a clamp, the movement of the left and right folding plates 64 and 65 with respect to the left and right pushing members 61 and 62 affects the tension of the film F. Is getting bigger. Therefore, the above-mentioned merit by controlling the movements of the left and right pushing members 61 and 62 and the left and right folding plates 64 and 65 in accordance with the properties of the film F and the product G is the tension of the film F in the stretch wrapping apparatus 10. This is very effective from the viewpoint of optimizing the condition.
[0084]
(2)
In the stretch wrapping apparatus 10, the operator sets the initial positions of the left and right clamps 51 and 52 before operation as described above. That is, the initial positions of the left and right clamps 51 and 52 are corrected according to the width W1 of the product G and the width W3 of the film F.
[0085]
For this reason, when the width W1 of the product G is short, the left and right clamps 51 and 52 grip the film F at a portion closer to the product G than the left and right ends of the film F. In this way, when the width W1 of the product G is short, the left and right clamps 51 and 52 are corrected so as to grip the left and right portions of the film F close to the product G. With this, a sufficient amount of pre-stretch can be secured.
[0086]
(3)
In the stretch wrapping apparatus 10, the film F is folded to the bottom side of the product G by the rear folding plate 71, and the film F folded to the bottom side of the product G is sandwiched and crimped by applying the rear folding plate 71 to the front fixing member 72. The film F is heat-sealed by applying heat from the nichrome wire 81 thereto.
[0087]
Since only the rear folding plate 71 is moved forward and the front fixing member 72 is fixed to the front side and does not move, the folding operation of the film F to the bottom side of the product G by the forward movement of the rear folding plate 71 is performed. At times, the product G moves forward in a form attracted to the film F. That is, when the film F is folded in such a way that both the front member and the rear member enter the lower side of the product G, the planar position of the product G does not change. Since the front fixing member 72 is fixed, the product G moves to the front side during the folding operation. Thus, as can be seen by comparing FIG. 12 (a) and FIG. 13 (e), after the folding by the rear folding plate 71 is finished and the film F is heat-sealed on the bottom side of the product G, the plane of the product G The target position is on the front side (the front side of the apparatus 10) from the position where the product G is pushed up with respect to the film F held in tension. Therefore, the operator can easily take out the product G that has been heat-sealed and packaged.
[0088]
As described above, in the stretch wrapping apparatus 10, the commodity G can be moved to the front side of the apparatus 10 even though a conventionally used pusher is not provided, and the operator can easily take out the commodity G. It is increasing. In addition, since the pusher does not directly hit the product G and pushes out the product G as in the past, it is possible to prevent the product G from being damaged in the Notley packaging or the like.
[0089]
Since the front clamp 54 is moved backward in the final stage in which the product G moves forward when the film F is folded by the rear folding plate 71, it is possible to suppress excessive tension from acting on the film F. At the same time, the phenomenon in which the product G is prevented from moving forward is suppressed. That is, the product G comes out more forward by the rearward movement of the front clamp 54.
[0090]
(4)
In the stretch wrapping apparatus 10, since the nichrome wire 81 is attached not to the rear folding plate 71 but to the front fixing member 72, it is not necessary to take movement into consideration for the nichrome wire 81 and the portion related to the nichrome wire 81. As a result, it is easy to ensure the durability of the nichrome wire 81 and the like as much as it does not move, and the cost can be reduced. That is, when the member to which the nichrome wire 81 is attached moves, the external load on the nichrome wire 81 is increased and the cost of parts for ensuring durability is increased, but here the front side fixing member 72 is increased. Since the nichrome wire 81 is attached to the device 10, the durability of the device 10 can be secured at a low cost.
[0091]
Further, since the nichrome wire 81 and the front fixing member 72 do not move, it is easy to provide a thermistor 82 for monitoring the heat seal portion.
[0092]
(5)
Conventionally, when determining the application condition of the impulse seal, a condition of a certain voltage and time is determined by a test. Therefore, there is a problem that the ambient temperature is not taken into consideration. Also, the conditions are basically settings that cannot be changed.
[0093]
On the other hand, in the stretch wrapping device 10, the current value, voltage value, number of times, and energization time of the impulse flowing through the nichrome wire 81 based on the temperature measured by the thermistor 82 embedded in the aluminum plate 72a of the front side fixing member 72. At least one has been changed. For this reason, the heat sealing of the film F can be performed with a heat input amount that is not excessive or insufficient.
[0094]
Since the thermistor 82 is embedded in the front fixing member 72, even if the rear folding plate 71 hits the front fixing member 72, there is no problem that the thermistor 82 is detached from the front fixing member 72 due to an impact.
[0095]
(6)
In the stretch wrapping apparatus 10, when the rear folding plate 71 folds the rear part of the film F to the bottom side of the product G, the central support member 35 a of the lift mechanism 30 moves while supporting the product G. Therefore, the movement of the central support member 35a with the product G supported supports the interference between the lift mechanism 30 and the rear folding plate 71, and the product G is supported by the central support member 35a when the film F is folded. Is maintained for as long as possible.
[0096]
Further, since the central support member 35a moves forward while supporting the product G, the product G and the central support member 35a do not slide, and damage to the product G due to friction between both the G and 35a is suppressed.
[0097]
(7)
In the stretch wrapping apparatus 10, the product G is supported during the folding operation of the film F by the rear folding plate 71 by the central front and rear support member 34 b supported by the first base 31 and the central support member 35 a supported by the second base 32. As the rear folding plate 71 approaches, the center longitudinal support member 34b is first lowered and the center support member 35a is moved forward while the product G is supported. Therefore, although the part which supports the goods G of the lift mechanism 30 is large as a whole, since the center support member 35a is small, the state which supports the goods G by the center support member 35a of the lift mechanism 30 is maintained as long as possible. And since the position (position which supports the center of the bottom part of the goods G) which suppresses the undesirable deformation | transformation of goods G is supported by the center support member 35a, goods G will warp in the folding operation by the back folding plate 71. This can be suppressed.
[0098]
Further, since only the center support member 35a of the lift mechanism 30 needs to be moved forward, a relatively small force may be applied, and the center support member can be pushed by the rear folding plate 71 without providing a dedicated drive device. The structure which moves 35a ahead can be taken.
[0099]
(8)
In the stretch wrapping apparatus 10, during the folding operation of the film F by the rear folding plate 71, the product G is supported as long as possible by the central support member 35 a that moves forward, but the central support member 35 a is lowered in the final stage.
[0100]
Then, the central support member 35a that has moved forward from the original position at the time of lowering is returned to the original planar position by guiding the guide roller 36a using the downward inertia force of the central support member 35a. I am doing so. For this reason, when the lift mechanism 30 supports the product G in order to press the next product G against the film F, the central support member 35a appropriately supports the product G together with the left and right support members 34a and the central front and rear support members 34b. It comes back to the position to do.
[0101]
[Other Embodiments]
(A)
In the above embodiment, a method is used in which the operator determines the initial positions of the left and right clamps 51 and 52 in the left and right direction. It is also possible to adopt a method in which the initial positions of the left and right clamps 51 and 52 are automatically set by a command from the control unit 90 having data of the width W1 and the width W3 of the film F.
[0102]
In this way, when a dedicated drive mechanism for moving the left and right clamps 51 and 52 to the left and right is provided, the control unit 90 may have the product before the packaging operation or before the product G is pressed against the film F in the packaging operation. The drive mechanism is controlled based on the width W1 of G and the width W3 of the film F, and the positions of the left and right clamps 51 and 52 are adjusted.
[0103]
Specifically, the control unit 90 adjusts the positions of the left and right clamps 51 and 52 so that the distance W2 between the left and right clamps 51 and 52 (see FIG. 9A) decreases as the width W1 of the product G decreases. To do. The width W3 of the film F is used for setting the maximum allowable value of the distance W2 between the left and right clamps 51 and 52. The controller 90 adjusts the positions of the left and right clamps 51 and 52 so that the distance W2 between the left and right clamps 51 and 52 does not exceed the maximum allowable value.
[0104]
It is also possible to cause the control unit 90 to adjust the positions of the left and right clamps 51 and 52 by adjusting the distance from the left and right ends of the film F of the left and right clamps 51 and 52 based on the width W1 of the product G. If the left and right clamps 51 and 52 always hold the left and right end portions of the film F, when the length of the product G is reduced, the film G is stretched to the portion of the film F that does not need to stretch the heel by the pre-stretching operation. Although waste occurs, if adjustment is performed in this way, the portions near the left and right ends of the film F are not stretched unnecessarily, and a sufficient amount of pre-stretching can be ensured with a small amount of clamp movement.
[0105]
(B)
In the above embodiment, a method is employed in which the operator determines the initial positions of the left and right clamps 51 and 52 in the left-right direction. However, the control unit determines whether or not the initial position adjustment of the left and right clamps 51 and 52 is correctly performed. It is also conceivable to provide a position sensor for confirmation so that it can be determined by 90.
[0106]
For example, if a plurality of position sensors capable of detecting the left and right positions of the outer end portions of the left and right clamps 51 and 52 are provided, the control unit 90 can determine the correct position based on the data of the width W1 of the product G and the width W3 of the film F It is possible to confirm whether the left and right clamps 51 and 52 are set in When the left and right clamps 51 and 52 are not correctly set, it is conceivable to display (or alarm) the controller 90 so as to notify the operator.
[0107]
(C)
In the said embodiment, although the idea which adjusts the left-right position of the left-right clamps 51 and 52 based on the width W1 etc. of the goods G is applied to the stretch packaging apparatus 10 of the type which conveys the film F back and forth, The present invention can be similarly applied to a stretch wrapping apparatus of a type that conveys the left and right directions.
[0108]
(D)
In the above embodiment, in the left and right folding operation, the movement amounts and movement timings of the left and right pushing members 61 and 62 and the left and right folding plates 64 and 65 are optimum based on the control data including the property information of the product G and the film F. However, it is also possible to optimize the moving speed of the left and right pushing members 61 and 62 and the left and right folding plates 64 and 65 by controlling the film pushing motor 63a and the left and right folding motor 68a with an inverter. It is done. Thereby, the tension of the film F can be made more appropriate.
[0109]
(E)
In the above embodiment, the central support member 35a of the lift mechanism 30 is pushed forward by the rear folding plate 71. However, the central support member 35a can be moved by a dedicated drive device. It is.
[0110]
Moreover, in the said embodiment, although the structure which moves only the center support member 35a which is a part of support member which supports the goods G in the lift mechanism 30 with the goods G is taken, the cost disadvantage should be considered. For example, it may be considered that the entire support member of the lift mechanism 30 can move forward.
[0111]
(F)
Instead of the central support member 35a of the above embodiment, a central support member 135 shown in FIG. 15A may be used.
[0112]
The central support member 135 has a structure in which support plates 135b and 135c are rotatably supported on both left and right sides of the main body 135a. Further, the support plates 135b and 135c are urged so as to return to the original state when the external force disappears even if the support plates 135b and 135c are rotated back and forth by the force of a spring (not shown).
[0113]
Here, when the center support member 135 is sandwiched between the rear folding plate 71 and the front side fixing member 72 and receives force from both the members 71 and 72, the support plates 135b and 135c are rotated and contracted in the front-rear direction (smaller). ). Thereby, the center support member 135 can support the product G longer than the center support member 35a.
[0114]
(G)
If the spring 36b shown in FIG. 15B is added to the return mechanism of the lift mechanism 30 of the above embodiment, the operation of returning the center support member 35a to the rear side more reliably is performed.
[0115]
The spring 36b is attached to the second base 32 and pulls the central portion of the rear link bar 35b backward. As a result, when the second base 32 descends after the first base 31 descends first, a backward reaction force acts on the front link bar 35b from the guide roller 36a, and the rear side is acted on by the spring 36b. A tensile force acts on the link bar 35b, and the central support member 35a returns to the original position backward.
[0116]
【The invention's effect】
In the present invention, the clamp moving mechanism is controlled based on the length of the article to be packaged. Adjust the distance from the film ends of the first and second clamps Therefore, when the length of the package is short, the first and second clamps can grip the film at a portion closer to the package than the film end. In this way, if the length of the package is short and the clamp is adjusted so that the part close to the package is gripped, a sufficient amount of pre-stretch can be secured with a small amount of movement in the pre-stretch operation. Will be able to.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a stretch wrapping apparatus.
FIG. 2 is a schematic front view of the stretch wrapping apparatus (a view taken along the line II-II in FIG. 1).
FIG. 3 is a schematic plan view of a stretch wrapping apparatus.
FIG. 4 is a control block diagram of the stretch wrapping apparatus.
FIG. 5 is a view showing the movement of the first base and the second base of the lift mechanism.
FIG. 6 is a view showing the movement of the first base and the second base of the lift mechanism.
FIG. 7 is a plan view of a lift mechanism.
8 is a view taken along arrow VIII-VIII in FIG. 3;
FIG. 9A is a diagram showing parameters in the initial position adjustment of the left and right clamps.
(B) The figure which shows the junction part of a left clamp and a left pushing member.
FIG. 10 is a diagram showing a left-right folding operation.
FIG. 11 is a schematic plan view when the left and right folding is completed.
FIG. 12 is a view showing a rear folding operation.
FIG. 13 is a view showing a back folding operation and a heat sealing operation.
FIG. 14 is a schematic plan view of one plane during a rear folding operation.
FIG. 15 is a partial side view of a lift mechanism according to another embodiment.
[Explanation of symbols]
10 Stretch packaging equipment
51,52 Left and right clamps (first and second clamps)
61, 62 Left and right pushing members
63a Film pushing motor
90 Control unit
F film
G Product (packaged item)
W1 Product width
W2 Distance between left and right clamps
W3 film width

Claims (4)

A wrapping device that performs a wrapping operation by pressing a package object against a tension-held film and folding a peripheral part of the film to the bottom side of the package object,
A first clamp capable of gripping the first side of the film;
A second clamp capable of gripping the second side of the film facing the first side;
A clamp moving mechanism for moving the first and second clamps in a direction connecting the first and second clamps;
Before packaging operation, or before pressing the material to be packaged into a film in the packaging operation, and controls the clamp movement mechanism based on the length of the direction connecting the first and second clamps to be packaged wherein A controller for adjusting the distance from the film ends of the first and second clamps ;
Packaging equipment with The control unit determines a maximum allowable value of a relative distance between the first and second clamps based on a length of the film in a direction in which the first and second clamps are connected, and a relative distance between the first and second clamps. Actuating the clamp movement mechanism so that does not exceed the maximum allowable value,
The packaging device according to claim 1. The control unit controls the clamp moving mechanism so that the relative distance between the first and second clamps becomes smaller when the length of the packaged object in the direction connecting the first and second clamps becomes smaller.
The packaging device according to claim 1 or 2. An initial setting method in a packaging apparatus having a packaging operation of pressing an object to be packaged against the film in a state where both sides of the opposing film are gripped by the first and second clamps and prestretched,
A first step of obtaining a length in a direction in which the first and second clamps of the package are connected;
The first and second clamps are moved in a direction connecting the first and second clamps according to the length of the packaged object, the initial positions of the first and second clamps are corrected, and the first And a second step of adjusting the distance from the film end of the second clamp ;
A method for initial setting in a packaging apparatus comprising:

Images