JP3244038B2 - Stretch wrapping 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 packaging machine for packaging articles (commodities) with a stretch film, and more particularly to a stretch packaging machine for folding an end of a film to the bottom side of an article to be packaged.

[0002]

2. Description of the Related Art In this type of conventional stretch packaging machine, an object to be packaged is placed on an elevator head and pushed up from below with respect to a film stretched over a packaging portion, and the surface of the object to be packaged is covered with a film. The end is folded to the bottom side of the article to be packaged to complete the packaging. The applicant of the present invention has provided an elevator head that pushes up the packaged object from below with respect to the stretched film so that the length of the elevator head can be changed according to the depth dimension along the transport direction of the packaged object. No. 8-66500.
In this device, the distance between a movable head element on the back side (a head element located forward in the transport direction of a packaged object) in an elevator head is moved in the front-rear direction, so that the distance between the movable head element and a fixed head element on the front side is variable. That is.

[0003]

However, in the above-mentioned packaging machine, since all the head element rows are configured to be variable lengthwise in the front-rear direction, a base member serving as a mounting base for the movable head element located on the back side is provided. Have become independent members for each row, and they must be assembled separately, resulting in a complicated structure and poor productivity. In addition, the work of removing the elevator head for maintenance and cleaning requires a total of six locations, the front and rear of the central head, and the front and rear of the left and right heads respectively. Was.

[0004] 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 packaging machine provided with an elevator head capable of changing the length of an elevator head without enlarging or reducing all the head element rows constituting the elevator head.

[0005]

Means for Solving the Problems To solve the above problems, the technical measures taken by the present invention are as follows. The head of an elevator that pushes up an object to be packaged from below with respect to a film stretched over a packaging unit is located at the center. In the stretch wrapping machine in which the elevator head is divided into a main head portion and left and right sub head portions, and the elevator head is enlarged or reduced in the front and rear direction according to the size of the article to be packaged, the left and right sub head portions are respectively moved in the front and rear direction. The main head portion is composed of a movable head element and a fixed head element that are movable in
It is characterized in that a moving means for moving the sub-head portion to a substantially central position in the front-rear direction is provided.

The movement of the movable head element and the movement of the main head element may be independently driven . In addition , the base member and the main head member of the movable head element are respectively movably engaged with a vertically movable guide member slidably disposed with respect to the machine frame. Further, the base member of each head unit or head element described above may be provided with a detachable mounting member. Further, at least one of the head elements of the main head portion is configured to be slidable against the urging force, thereby facilitating entry of the folding plate when folding the end of the film toward the bottom surface of the packaged object. You may do so.

According to the above means, the movable head elements in the left and right sub heads are moved in the front-rear direction, and the main head is also moved in accordance with the movement. Since the movement amount of the main head portion is substantially half of the movement amount of the movable head element in the sub head portion, the main head portion is always located substantially at the center of the sub head portion to be expanded. Therefore, the main head portion is always located at the center of the package.

Further, the base member and the main head portion of the movable head element are respectively movably engaged with a vertically movable guide member slidably disposed on the machine frame in a vertical direction.
The elevator head can be enlarged or reduced regardless of the position of the elevator head to be raised and lowered. Furthermore, each of the above-described head portions or the base member of the head element is provided with a detachable mounting member,
The number of removals can be reduced compared to the conventional structure, and workability such as maintenance and cleaning can be improved. Further, at least one of the head elements of the main head portion is configured to be slidable against the urging force, so that when the folding plate enters below the packaged object, like a rotary head element. There is no space between the packaged object and the head element, and the packaged object can be supported up to the final entry position of the folding plate.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an overall view of a stretch film packaging machine. A conveyor 1 for transporting a packaged object a to an elevator B provided inside the machine frame A is provided on the side of the machine frame A. A wrapping portion b is provided above, and a film for holding a film roll disposition portion 2 and a leading end of a film 3 ′ unwound from a film roll 3 set on the disposition portion 2 beside the wrapping portion b. The holding portion 4 is pulled out by a predetermined length with the front end of the film held by the film holding portion 4 interposed therebetween, and is stretched around the packaging portion b. A conveying means 5 for pre-stretching is arranged so that the film can be packaged by one narrow film roll. Above the conveying means 5, the end of the film 3 'covering the upper surface of the article to be packaged a is folded toward the bottom of the product. Discharging pusher 8 to discharge positioned above the rear folding plate 7 and the rear folding plate 7 and the left and right folding plates 6,6 'packaged the packaged product writing is located. In addition, the front folding is performed in the course of the discharge by the discharge pusher 8. Further, on the near side (upstream side) of the conveyor 1 of the packaging machine, the position in the direction perpendicular to the conveying direction of the packaged object is corrected and the packaged object a
On the upstream side of the roller conveyor 10 provided with the position correcting device 9 that also detects the lateral width of the sheet, a transfer device C on which an accumulation conveyor (not shown) is arranged is connected and arranged, thereby centering the article to be packaged. It is supplied one by one to the conveyor 1 of the packaging machine at a predetermined interval.

The conveyor 1 comprises a first conveyor 101 in which a plurality of belt-like belts are arranged in parallel at a predetermined interval, and a second conveyor
The conveyor 102 is configured to partially overlap, and the transport speed of the first conveyor 101 on which the packaged articles a sent from the transport device are placed is higher than the transport speed of the second conveyor, and the elevator Packaged a on B
On the belt surface of the second conveyor 102 for transporting
A stopper 103 for receiving the front end of the packaged article a carried in by the conveyor 101 is fixed. Thus, the transport of the packaged object a is performed based on the front end reference where the front end of the packaged object a is abutted against the stopper 103. The end of the second conveyor 102 for transporting the packaged article a onto the elevator B in the transport direction is inserted between a plurality of elevator heads constituting the elevator B, and the second conveyor 1
The transport surface of 02 is located above the elevator head surface before ascending. Further, a dimension detection sensor (not shown) for detecting the height and length (depth dimension) of the article to be packaged conveyed by driving of the conveyor 1 sandwiches the conveyance path. And are arranged to face each other.

The elevator head of the elevator B, on which the article to be packaged is mounted, has a main head portion 13 located at the center and sub head portions 14, 1 located on the left and right sides of the main head portion 13.
4 ', and the main head portion 13 is moved in the front-rear direction with respect to a substantially gate-shaped sliding frame 16 erected up and down on guide posts 15, 15' standing upright and fixed to the machine frame A. In the depth dimension of the head), and supported so as to be able to move up and down together with the sliding frame 16, and the left and right sub heads 14 and 1 are supported.
4 ′ is attached to a frame 17 formed in a reverse gate shape to integrally form the sub heads 14 and 14 ′, and the frame 17
The main head 1 is mounted on guide posts 18, 18 'which are fixed upright in parallel with the guide posts 15, 15' so as to be able to move up and down.
3 and the sub heads 14, 14 'are supported so as to be able to move up and down.

The main head portion 13 is a forked three-pronged flat surface having a space enough to fit and arrange a plurality of belt belts (two belts in the drawing) constituting the second conveyor 102, and has a substantially L-shaped side surface. And a head element 13e attached to the head base 13a made of synthetic resin. The head element 13e mounted on the left and right bases of the head base 13a is provided with a cylindrical support rod 13a.
b and a rectangular support rod 13c. The support rods 13b and 13c are mounted on a base plate 13d so as to be able to fall down, and the base plate 13d is fixed on a base. or,
The head element 13e 'attached to the middle base of the head base 13a has a storage section 1 having a rectangular cross section.
3f, a moving part 13g slidably supported in the front-rear direction with respect to the storing part 13f, and a compression spring 13h provided between the storing part 13f and the moving part 13g.
The moving part 13g is configured to be urged by the compression spring 13h in the carrying-in direction of the article to be packaged so as to be able to come and go. The main head 13 configured as described above is removably mounted on a mounting base plate 19 supported to be movable in the front-rear direction with respect to the sliding frame 16, and the main head part 13 is further mounted on the mounting base plate 19 in the front-rear direction. A moving means for moving horizontally is connected to the
Elevating means for vertically moving the main head 13 up and down is connected to the sliding frame 16.

As shown in FIGS. 9 and 10, the head base 13a of the main head portion 13 is detachably mounted on the mounting base plate 19, and pins 20 are erected on upper surfaces of both sides of the mounting base plate 19 in the width direction. On the other hand, a hole 21 is formed in the head base 13a so that the pin 20 can be fitted therein, and a hook 22 formed in the mounting base plate 19 on the side of the head base 13a.
The main head 13 can be detached from the mounting base plate 19 in an upward direction by removing the hook 23 from the hook 22.

The sub heads 14, 14 'arranged on the left and right sides of the main head 13 have a movable head base 14a and a fixed head base 14 each having a substantially L-shaped side surface.
a ', a movable head element 14b detachably attached to the upper end of the movable head base 14a, and a fixed head element 14b' detachably attached to the upper end of the fixed head base 14a '. The movable head element 14b has a columnar supporting rod 1 on the upper surface of the base plate 14c.
The fixed head element 14b 'has a rectangular support rod 14d' mounted on the upper surface of the base plate 14c 'so as to be capable of falling. The base plates 14c, 14c 'are detachably attached to the movable head base 14a and the fixed head base 14a', respectively. The movable head base 14a and the fixed head base 14a 'are arranged in a straight line with their horizontal pieces overlapped in the vertical direction, and the front movable head base 14a is moved in the front-rear direction (covered) with respect to the rear fixed head base 14a'. It is supported so that the movement can be adjusted in the depth dimension direction of the package a).

As shown in FIGS. 9 and 11, the movable head base 14a and the fixed head element 14b 'are attached to the movable head base 14a and the fixed head base 14a' of the sub head sections 14 and 14 '.
In addition, the pin 24 is fixed on the upper surface of the fixed head base 14a 'in an upright position. On the other hand, a hole 25 in which the pin 24 fits is formed in the base plate 14c of the movable head element 14b and the base plate 14c' of the fixed head element 14b '. , And the movable head base 14
a and the movable head element 1 on the fixed head base 14a '.
The base plate 14c of the fixed head element 14b 'and the base plate 14c of the fixed head element 14b'
A buckle-like hook 27 that can be engaged and disengaged from the hook 26 formed on the c ′ side is attached.
The movable head element 14b
The fixed head element 14b 'is connected to the movable head base 14a.
And can be removed upward from the fixed head base 14a '.

The moving means for horizontally moving the main head portion 13 in the front-rear direction includes two drive belts 28, 28 'arranged at the bottom of the machine frame A as shown in FIGS.
The drive belts 28, 28 'are provided with a stepping motor 29.
Large / small pulleys 30, 3 with different outer diameters fixed to the rotary shaft
The driving belt 28 'is wound around the small pulley 30' so that the moving distance of the driving belts 28 and 28 'is different (largely doubled).
An L-shaped frame 32 movably supported in the front-rear direction along a guide rod 31 attached to a side of the machine frame A is connected and fixed, and the main head portion 13 is inserted into a vertical groove 32 ′ of the L-shaped frame 32. The front end of a connecting rod 33 connected to the rear end of the mounting base plate 19 that supports is mounted. Accordingly, when the motor 29 is driven by a drive amount corresponding to the depth dimension of the packaged object to rotate the small pulley 30 'and the drive belt 28' is rotated, the L-shaped frame 32 is moved in the running direction of the belt. The main head portion 13 is moved in the front-rear direction via a connecting rod 33 fitted and engaged with the vertical groove portion 32 'of the L-shaped frame 32. A driving mechanism for driving the main head 13 up and down includes a groove 34 'of a cam 34 rotated by a motor as shown in FIG.
A shaft provided on one side of an arm rod 35 which is formed in a substantially rectangular shape, is pivotally supported at the middle, and is vertically swingably mounted, is fitted and engaged, and is connected to the other side of the arm rod 35. The other end of the connecting rod 36 is directly connected to the sliding frame 16 so that the main head 13 is moved up and down.

As described above, the movable head base 14a of the sub heads 14, 14 'is provided with the inverted gate-shaped frame 1 as described above.
The frame 17 is supported by a driving belt 28 wound around a large pulley 30 of the moving means so as to be movable in the front-rear direction along a guide rod 31 attached to the side of the machine frame A. Support plate 37 and the vertical groove 3 of the support plate 37
It is connected via a horizontal rod 38 fitted to 7 '.
The sub heads 14 and 14 'are arranged so that the movable head base 14a moves in the front-rear direction (longitudinal direction) with respect to the fixed head base 14a' as described above, so that the length of the head can be continuously varied. Therefore, the position detection flag 39 is attached to the drive belt 28 of the moving mechanism, and the detectors 40 and 40 'are attached at predetermined intervals to the side of the drive belt 28 to expand and contract the head. It is configured to be able to detect a variable state. This allows
The main head 13 moves to an intermediate position with respect to the sub-heads 14, 14 'when the sub-heads 14, 14' expand and contract in the front-rear direction.

The main head 1 constructed as described above
The subhead 3 and the sub-heads 14 and 14 'are configured to be connectable and separable according to the width dimension of the packaged object a. The connection / separation switching mechanism includes a sliding frame 16 to which the main head 13 is connected.
The two engaging rods 41 are horizontally installed and fixed at a predetermined interval, and an engaging member 42 that engages with and disengages from the engaging rod 41 is fixed to an upper end of a transmission unit 44 driven by a driving unit 43. ing. The engagement member 42 is a rod slightly narrower than the interval between the engagement rods 41 and is formed longer than the interval between the engagement rods 41. Transmission means 44 for fixing the engaging member 42 to the upper end
Is a projection member 45 having an engagement projection 45 'formed at one end (lower end) of the rod, and the engagement projection 4 at one end (upper end) of the rod.
And a concave member 46 formed by cutting out an engaging concave portion 46 ′ into which the 5 ′ is fitted.
The engaging member 42 is connected at a right angle (T-shape) to the opposite side. A position control plate 47 having a square planar shape is horizontally attached to the convex member 45 in the middle of the rod in the longitudinal direction, and the rod portion below the position control plate 47 is attached to the sub head portions 14, 14. ′ Attached to the bottom frame 17a of the frame 17
The position control plate 47 protruding downward through the bottom frame 17a and mounted on the upper surface of the bottom frame 17a is provided so as to cover the control plate 47.
a and is supported by the frame 17 so as to be rotatable at a fixed position in a vertical state with respect to the frame 17. Bottom frame 1
Position control plate 47 sandwiched between 7a and cover 17b
As shown in FIG. 15, the periphery is parallel to the side of the engaging member 42 fixed to the rod, and the convex member 45 is provided around the position control plate 47 at an incomplete angle. The control pieces 48, 48 'for adjusting so as not to stop are biased by springs so as to rotate in opposite directions at respective relative positions.

With the above configuration, the size (area) in the width direction of the elevator head on which the article to be packaged a is placed can be varied in size according to the size of the article to be packaged a. Section 13 and sub head sections 14, 14 '
The connection / separation is switched by operating the driving means 43 in a state where the main head portion 13 is located at the lowest position.
4 by rotating the engaging member 42 attached to the upper end of the convex member 45 of the transmission means 44.
The transmission means 44 is lifted together with the sliding frame 16 supporting the main head portion 13 by arranging the sliding frame 16 supporting the main frame 13 at right angles to the engaging rod 41. Since the means 44 is configured to be vertically separated on the way, only the upper convex member 45 rises together with the sliding frame 16. Since the convex member 45 of the transmission means 44 is engaged via the position control plate 47 with the frame body 17 which connects and holds the sub heads 14 and 14 ', the sub heads 14 and 14' are connected and held. The frame 17 thus moved up together with the main head 13. (See Fig. 16)

When the width of the article to be packaged a is small and the width of the elevator head is small, the driving means 43 is operated to rotate the transmission means 44, whereby the engaging means attached to the upper end of the transmission means 44 is engaged. The member 42 is rotated so that the direction of the engaging member 42 is parallel to the engaging rod 41 of the sliding frame 16 so that the engaging member 42 does not engage with the engaging rod 41. As a result, the sliding frame 16 supporting the main head 13 is disengaged from the engaging member 42, and only the sliding frame 16 is raised, and the frame 17 holding and connecting the sub heads 14, 14 'is moved to the lowest position. Will be left behind. (See Fig. 17)

In the embodiment described above, the left and right sub heads 1
The packaging machine is capable of adjusting the width of an elevator head in which only the central main head portion 13 moves up and down while leaving the main head portion 4 and 14 'or the main head portion 13 and the sub head portions 14 and 14' move up and down integrally. However, it goes without saying that the present invention can also be applied to a packaging machine in which the width of the elevator head in the left-right width direction cannot be changed. In addition, since the center of the center head and the packaged object are more coincident with each other as compared with the related art, even when only the central head is raised with the vertically long packaged object, the packaging can be performed with a good finish. Furthermore, the dimensions of the packaged items are not limited to those measured each time, and are preset in advance,
You may call it. In addition, the front-rear direction, which is the enlargement / reduction direction of the elevator head in the present invention, is based on the discharge direction of the packaged object.

[0022]

According to the stretch wrapping machine of the present invention, all the head element rows constituting the main head portion and the left and right sub head portions are enlarged corresponding to the depth dimension of the article to be wrapped. Since there is no need to reduce the size and the central main head moves together, the central main head can have a simple configuration and cost can be reduced. Soshi
And the center main head is always in front of and behind the left and right sub heads.
It is located almost in the center, and can stably load the packaged object, and can pack it with a good finish. Further, according to the configuration of the second aspect , since the elevator head can be enlarged or reduced regardless of the position of the elevator head, the operation of the enlargement or reduction can be performed by reducing the packaging ability (speed). It can be performed at a timing that does not cause the occurrence. Further, claim 3
According to the configuration described in (1), the number of locations where the head is removed for maintenance or cleaning can be reduced, so that workability can be improved. Further, according to the configuration of the fourth aspect , when the folding plate enters below (toward the bottom of) the article to be packaged, the folded article and the head element are separated from each other like a rotary (falling) head element. Since there is no space between them, even if a head element that can prevent the bottom of the packaged object from falling down and hitting the folding plate and damaging the packaged object is provided, the packaged object having various depth steps can be used. It can be easily handled.

[Brief description of the drawings]

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

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

FIG. 3 is an enlarged front view of an elevator part.

FIG. 4 is a cutaway plan view of the same part.

FIG. 5 is a sectional view taken along the line (5)-(5) of FIG.

FIG. 6 is a sectional view taken along the line (6)-(6) of FIG.

FIG. 7 is an enlarged plan view of the elevator head in the front-rear direction.

FIG. 8 is a sectional view of the same.

FIG. 9 is an exploded perspective view showing the elevator head.

FIG. 10 is an enlarged view showing a mounting structure between a head base and a mounting base plate in a main head portion.

FIG. 11 is an enlarged view showing a mounting structure of a head base and a head element in a sub head unit.

FIG. 12 is an explanatory view showing a state where the folding plate is advanced to fold the end of the film.

FIG. 13 is an explanatory view showing a state in which the folding plate has entered below the article to be packaged and folded the end of the film.

FIG. 14 is a plan view of FIG.

FIG. 15 is a perspective view showing an engaging member for switching the width of the elevator head in the width direction.

FIG. 16A is a front view showing a state in which the main head and the sub head are connected to each other and ascending, and FIG. 16B is an explanatory view showing directions of an engaging member and a flag.

FIG. 17A is a front view showing a state where a main head portion and a sub head portion are separated, and only the main head portion is raised;
(B) is an explanatory view showing directions of the engagement member and the flag.

[Explanation of symbols]

A: Machine frame B: Elevator 1: Conveyor 13: Main head section 14, 14 '... Sub head section 14a: Movable head base 14a': Fixed head base 14b: Movable head element 14b ': Fixed head element a: Packed object

Claims (4)

(57) [Claims] An elevator head for pushing up an object to be packaged from below against a film stretched over a packaging part is divided into a central main head part and left and right sub head parts, and the size of the object to be packaged is reduced. In the stretch wrapping machine in which the elevator head is expanded or contracted in the front-back direction, a movable head element and a fixed head element that can be moved in the front-rear direction are provided on the left and right sub-head portions, respectively. The main head portion in front of and behind the sub head portion,
A stretch wrapping machine, comprising a moving means for moving to a substantially central position . 2. A base member and a main head of the movable head element.
The heads are slidable with respect to the machine frame.
Engage with the vertical movement guide member movably in the vertical direction.
The stretch packaging machine according to claim 1, wherein the lower movement guide member is moved . 3. A head element or a head element as described above.
The base member has a detachable mounting member
Stretch wrapping machine according to claim 2, characterized in that it comprises. 4. The apparatus according to claim 1 , wherein at least the head element of the main head section is provided.
The other is configured to be slidable against the urging force,
Folding when folding the end of the film to the bottom of the package
1 through claim, characterized in that to facilitate the entry of saw plate
3. The stretch packaging machine according to any one of 3 .