JPH089362B2 - Stretch wrapping equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch wrapping apparatus, and more particularly, to an upper surface of a wrapping object by pushing up a wrapping object from below a film which is drawn out by a wrapping part and is on standby for extension. The present invention relates to a stretch wrapping device in which a sheet is covered with a film, and then four peripheral edges of the film are folded into the bottom of the article to be packaged.

[0002]

2. Description of the Related Art Conventionally, as this type of stretch wrapping device, for example, a device disclosed in Japanese Patent Laid-Open No. 50-65384 is known. Such a conventional device is
After grasping both side edges in the width direction of the film pulled out to a predetermined position of the wrapping part, the film is stretched (pre-stretched) in the width direction and the stretched amount is the time when the object to be packaged is pushed up to the film. The stretching / loosening operation (pre-stretch releasing operation) of the left and right clamp mechanisms that make the movement to decrease by the lifting operation of the lifting lift, which is commonly called an elevator, that is, the film that is pulled out to the wrapping part and stands by in a stretched state. The object to be wrapped is lifted and pushed toward the film from below in a direction synchronized with the ascending operation so that the film is stretched more than necessary by pushing the object to be packed. It is configured to prevent. However, the above-mentioned conventional device is irrelevant to the shape and size (height) of the object to be packaged. The left and right clamp mechanisms for approaching each other to loosen the extension of the stretched film and the lifting and lifting of the object to be packaged. Since the movement of the lift is the same as that of the lift, not only the shape and size of the wrapping object that can be wrapped are limited, but also the film is prevented from being stretched more than necessary by pushing up the wrapping object. Since it is the purpose, it is not possible to adjust the tension of the film and the extension amount of the strength according to the packaged object.
Therefore, in the case of an article to be packaged using a soft tray such as strawberries, there is a drawback that the tray is deformed and cannot be packaged. Moreover, it is required to wrap the article to be packaged directly with a film without using a tray in a situation where environmental problems due to non-burnable dust are being agitated, and a packaging form for packaging the article to be packaged by a so-called note ray system is required. In recent years, it has been difficult for conventional devices to wrap beautifully a plurality of (bulk) objects to be packaged, such as cucumber and carrot, which do not have a uniform shape, without using a tray.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and is particularly improved by adjusting the stretch amount of the film in accordance with the shape and size of the packaged object. It is an object of the present invention to provide a stretch wrapping device which is effective for a Notley wrapping form.

[0004]

The technical means taken by the present invention to achieve the above object is to raise an object to be packaged from below a film which is pulled out to a packaging part and is on standby for extension. In a packaging device that pushes up and covers the upper surface of the packaged object with a film, and then folds the end of the film to the bottom of the packaged object, a film transfer mechanism that transfers the film to a predetermined position of the packaging section, and a film withdrawal mechanism. Left and right clamp mechanisms that are arranged on both sides of the wrapping section that intersects the direction and that grip the widthwise both side edges of the film transferred to the predetermined position of the wrapping section, and move the left and right clamp mechanisms toward or away from each other. The clamp moving mechanism that allows the package to be wrapped and the film to be packaged that is placed under the wrapping unit, is pulled out to the wrapping unit, and is waiting to be stretched. And a sensor for detecting the top at a predetermined position in front of that, and before and after the top of the package is detected by the sensor, the left and right clamp mechanisms are moved in directions away from each other to stretch the film by a predetermined amount. When the sensor detects the top of the package, the left and right clamp mechanisms are moved toward each other so as to reduce the amount of stretching of the film. Further, the left and right clamp mechanism is composed of a lower clamp plate and an upper clamp plate, and the upper clamp plate is a left and right folding plate.

[0005]

According to the above-mentioned technical means of the present invention, the widthwise both side edges of the film drawn and transferred by the film transfer mechanism to a predetermined position of the wrapping part intersect the drawing direction. The film is gripped by the left and right clamp mechanisms arranged on both sides of the section, and the left and right clamp mechanisms are moved in a direction in which they are separated from each other, so that the film is stretched (pre-stretched) by a predetermined amount in the width direction. Then, the operation of ascending and pushing up the object to be packaged from below the film toward the film is started, and when the top of the object to be packaged is detected by the sensor during the ascending process, the left and right clamp mechanisms approach each other at that time. The film is moved in the direction to appropriately reduce the stretching amount of the film. As a result, the film is not stretched more than necessary by pushing up the packaged object, and the packaged object is correctly packaged with an appropriate amount of tension and extension. Further, the structure is simplified by using the left and right folding plates as the fixed clamp plates of the left and right clamp mechanism.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the entire stretch wrapping apparatus of the present embodiment. A carrying-in section A for placing a product) is arranged on the front side of the apparatus machine frame 3, while a film 2 for wrapping the article 1 is horizontally pulled out and stretched in a stretched state.
Is disposed on the upper surface of the machine frame 3, and the film 2 is pulled out from the film supply mechanism G by a predetermined length at a position in the front and rear direction of the film withdrawing direction X of the packaging part B, and the drawn film 2 is provided in the predetermined part of the packaging part B. A film transfer mechanism C for transferring to a position is provided, and both sides of the width direction of the film 2 transferred to a predetermined position are grasped on both sides of the packaging section B intersecting with the drawing direction X, and In the apparatus frame 3, the left and right clamp mechanisms D extending in the width direction are arranged, and the transport mechanism E for transporting the product 1 received from the carry-in section A to the packaging section B is supported by the drive mechanism F. After being movably provided in the horizontal direction and the vertical direction, and the carrier table E is horizontally moved to the carry-in section A on which the product 1 is placed by the horizontal operation section F-1 of the drive mechanism F described later, Drive at the loading section A The product 1 is vertically moved by a vertical operation unit F-2 of the mechanism F, which will be described later, and receives the product 1 from the carry-in unit A on its upper surface. Then, the carrier E on which the product 1 is placed is horizontally moved to the lower side of the packaging unit B by the horizontal operation unit F-1 to carry the product 1 below, and then the film transfer mechanism C and the left and right clamps. With the mechanism D and the four peripheral edges on both the front and rear sides being held and being stretched by a predetermined amount, the vertical movement section F-2 is directed toward the film 2 which is horizontally suspended in the packaging section B. By these movements, the carrier E is moved horizontally and vertically from the carry-in section A to the packing section B, and the product 1 placed on the carry-in section A is packed from the carry-in section A only by the carrier stand E. It is configured to be conveyed to the part B and pushed up to the film 2 of the wrapping part B for wrapping.

The carrying-in section A is formed of a plurality of mounting rods 4 in the shape of a flat comb blade which is open at the other end and has one end thereof connected and supported at appropriate intervals. Receiver
The product 1 placed on the space between the loading rods 4 can be received by passing the space between the loading rods 4. The carrying-in section A is fixedly supported on the supporting rods 6 on both sides projecting from the measuring instrument 5 with a built-in load cell, which is disposed at the central portion in the height direction on the front surface of the machine frame 3, and is above the measuring instrument 5. After being arranged (see FIGS. 1 and 2), the weight of the commodity 1 placed on the placing rod 4 is detected, and the weight data calculated by a label printer (not shown) and the weight data are calculated. The label with is printed. The product 1 may be placed on the carry-in section A either manually by an operator or automatically by a supply conveyor or the like.

The packaging section B holds the front edge of the film 2 and pulls the film 2 out of the film supply mechanism G by a predetermined length.
A film transfer mechanism for arranging C-1 so as to be horizontally movable in the front-rear direction on the front side of the machine frame 3 on the side of the carry-in section A, and for grasping the trailing edge of the film 2 pulled out to the upper inside of the machine frame 3. C
The rear clamp mechanism C-2 described later in
The film 2 is pulled out by a left and right clamp mechanism D that is horizontally movably arranged in the front-rear direction on the rear surface side of the machine frame 3 in the direction facing 1 (see FIG. 1) and holds both left and right edges of the film 2. Machine frame 3 intersecting (orthogonal) with respect to the drawing direction X
(See FIG. 3) on both sides of the film feeding mechanism G, and the four peripheral edges of the film 2 pulled out from the film feeding mechanism G
The film 2 is held by being held by C-2 and D and stretched or pre-stretched by a predetermined amount.

The film transfer mechanism C is composed of a film drawing mechanism C-1 and a rear clamp mechanism C-2. The film drawing mechanism C-1 is a flat comb blade having such a length as to extend between both sides of the machine frame 3. The film gripping portion is formed in a shape of one and is fixed to the other side, and the other is tilted by a gripping cylinder (not shown) so as to be movable toward and away from the fixed side to grip or release the front edge 2a of the film 2. Both side ends of 7 are connected to and supported by slide bushes 9 of both side guide shafts 8 which are attached in a crosswise manner in both front and rear directions of the machine frame 3 via connecting tools 10 so as to be movable in the film drawing direction X. At the same time, one end of the film is fed from the film supply mechanism G by being connected to a timing belt 12 which is wound around the outer surface of one side of the apparatus frame 3 in the front-rear direction and which is rotated by a motor 11 in the front-rear direction. the film Of the film leading-out direction X from the film tip holding portion H having a flat comb blade shape disposed on the rear surface side of the machine frame 3 for holding the front edge (front edge) 2a of the film machine to the front side of the machine frame 3. It can be moved to an appropriate position by the motor 11 in the range over the entire length. That is, the pull-out length of the film 2 according to the size of the product 1 and the pulled-out film 2 to the predetermined position of the packaging section B are rear clamp mechanism C-
The motor 11 is configured to perform these movements which are transferred by a cooperative operation in synchronism with 2. On the other hand, the rear clamp mechanism C-2 is formed to have a length that extends between both sides of the apparatus frame 3 like the film drawing mechanism C-1, and the movable side is fixed to the fixed side by a gripping cylinder (not shown). Both ends of the film gripping portion 13 that tilts so that it can be moved in and out freely to grip or release the trailing edge 2b of the film 2 are connected and supported to the slide bushes 14 of the above-mentioned two-sided guide shafts 8 via the connecting members 15. At the same time, one end of the device frame 3
The motor 16 is wound around the outer surface of the other side in the front-back direction.
It is connected to a timing belt 17 that rotates in the front-back direction by the motor 16 and moves to an appropriate position in the film withdrawing direction X by its own motion and the cooperative operation synchronized with the film grasping section 7 of the film withdrawing mechanism C-1. It is configured to obtain.

The left and right clamp mechanisms D for holding both side edges 2c of the film 2 in the width direction are positioned substantially below the left and right folding plates 27 of the left and right folding mechanism L, which will be described later, which stands by in an open state. A movable clamp plate 19 having a substantially L-shaped cross section is mounted on an elevating frame which is connected to and supported by the upper end of the rod of the installed air cylinder 18, and a spring 20 is wound around the left and right folding plates 27 so as to be movable in the folding and returning directions. guide pin
The movable clamp plate 19 is mounted and supported by 21, and the movable clamp plate 19 is raised by the cylinder 18 and brought into contact with the lower surfaces of the left and right folding plates 27, whereby the left and right side edges 2C of the film 2 are grasped. That is, the left and right clamp mechanism D uses the left and right folding plates 27 as the left and right fixed clamp plates (see FIG. 13B) to move the movable clamp plate 19 along with the movement of the left and right folding plates 27 by the control means described later. The film 2 to be gripped is stretched (pre-stretched) by a predetermined amount in the width direction, and the product 1 is lifted and pushed up by the carrier E toward the film 2 in the ascending process. Upon detection, the extension amount in the width direction of the film 2 is appropriately reduced, that is, the pre-stretch amount is reduced.

The control means is constituted by a microcomputer (not shown) that executes a program stored in a read only memory (ROM).
The sensor I pulls up the commodity 1 to a predetermined position of the packaging section B and ascends and pushes it up toward the film 2 which is waiting to be stretched by the carrier E. In the ascending process, the top of the commodity 1 is shielded from light. Is a reflection-type sensor for detecting by means of a reflective plate J disposed at one corner on a diagonal line at a lower predetermined height position of the packaging portion B, and on the other side opposite corner. The top of the product 1 is pushed up by the carrier base E and operated at the time when the light is not reflected by the reflector J, that is, when the light is blocked by the top of the product 1, and the top of the product B is the packaging part B. It is detected that the film has reached a predetermined position below the film 2, and a detection signal is output. When the output signal is output, the control means outputs a signal to the motor 33 of the clamp moving mechanism M to start the operation of moving the left and right clamp mechanisms D in the direction of approaching each other.

Further, the film drawing direction X of the packaging section B
A front and rear folding mechanism K for folding the front and rear edges of the film 2 to the bottom side of the product 1 is disposed on the front and rear sides of the machine frame 3 located on the both sides of the machine frame 3 intersecting the drawing direction X. A left and right folding mechanism L for folding the left and right side edges 2c of the item 2 to the bottom side of the product 1 is provided.

The front and rear folding mechanism K includes a folding plate 22 having a flat rectangular shape formed in a length across the width of the machine frame 3 on the side of the film drawing mechanism C-1 and the side of the rear clamping mechanism C-2, respectively. The device frame 3 is arranged so as to be horizontally movable in the front-back direction.
The motor 23, which is wound around the outer sides of the
The two ends of the chain 24 which are tuned and rotated by the coupling arms 25 are fixedly connected by the connecting arms 25, respectively, and the distances between them are made close to each other at the synchronized moving speeds.
The front edge and the rear edge of the product are simultaneously folded into the bottom side of the product 1. In addition, either one of the front and rear folding plates 22, in the illustrated example, a heater for heat sealing is provided at the folding edge of the front folding plate 22.
26 is embedded and installed (see FIG. 3).

On the other hand, in the left and right folding mechanism L, a strip plate-shaped folding plate 27 formed to have a length extending between the front and rear folding plates 22 waiting in a fully opened state is positioned on the front and rear folding plates 22. In this state, the left and right sides of the machine frame 3 are arranged so as to be horizontally movable in the left and right directions, and the front and rear ends thereof are connected to the chain 24.
Is supported and connected by a guide bush 30 to a rotary shaft 29 which is installed before and after being wound and held via a sprocket 28, and the rear ends of the left and right folding plates 27 are connected to the rear clamp mechanism C-
2, one end side of each of which is fixedly connected to a rear chain 31 arranged in the vicinity of the upper part of the motor 2 by a connecting arm 32,
33, the left and right edges of the film 2 are simultaneously folded into the bottom side of the product 1 so that they are close to each other at the moving speeds synchronized with each other. That is, the chain 31 and the motor 33 that move the folding plates 27 of the left and right folding mechanism D toward and away from each other become the clamp moving mechanism M of the left and right clamping mechanism D, and the left and right clamping mechanism D is moved by driving the motor 33. The clamp plate 19 moves in the direction of approaching or separating.

The carrying table E receives the goods 1 placed on the carry-in section A and weighed from the carry-in section A, and at the same time, conveys the product 1 below the packing section B and from below the packing section B. It has a function of pushing up and feeding it toward the film 2 that is pulled out and stretched in the vertical direction, and the standing portions are arranged at intervals so as to pass between the comb-shaped mounting rods 4 constituting the carry-in portion A. A receiving portion 36 for receiving the product 1 is fixedly disposed on each standing portion 34 of the head base 35 having the 34 (see FIG. 4), and the drive mechanism F is supported by a supporting member 37 to The drive mechanism F is arranged so as to be movable in the horizontal and vertical directions in the machine frame 3 by the movement of the drive mechanism F.

The drive mechanism F is installed at the bottom of the machine frame 3 to move the carrier E from the carry-in section A to the packaging section B. The carrier E supported by the support member 37 is carried in. A horizontal operation unit F-1 for horizontally moving between the section A and the wrapping section B, and a vertical operation section F for vertically moving the carrying table E at each of the loading section A and the wrapping section B. -2
Consists of The support member 37 includes guide struts 38 on both sides of which the lower ends are fixedly attached to the bottoms of both sides of the machine frame 3, and both side frame portions are vertically slidably supported between the both side guide struts 38 to support the machine frame. 3. A vertical moving frame 39, which is horizontally arranged in the frame 3 and forms a frame in a rectangular shape in a plane, and guide grooves 40 provided on the inner surfaces of both side frames of the vertical moving frame 39. A front and rear moving plate 41 is provided inside the moving frame 39 so as to be slidably movable in the front and rear direction, and a supporting leg 42 is formed on the front side of the front and rear moving plate 41 and has an L-shaped side surface. The head base 35 of the carrier E is fixedly supported via the carrier base E so that the carrier E can enter under the carry-in portion A without the support rod 42 making the length of the support rod 6 too long. (Fig. 1
reference).

The horizontal operation part F-1 is a reduction box 43 having a gear mechanism, a so-called reduction mechanism, built in the bottom of the machine frame 3.
A cam A46 attached to a cam shaft 45 linked to the main motor 44 installed via the cam, and the cam A46 is connected to the cam A46 to swing the front end side, that is, the swing end up and down with the rear end shaft support 47 as a fulcrum. A swinging arm A48 for moving and a swinging end of the swinging arm A48, which has a substantially L-shaped side surface and whose corner portion is attached to a swinging shaft 49 which is installed on the bottom of the machine frame 3, is connected to the connecting arm A50. A starter arm 51 axially connected to the end of the short side via a connecting elongated hole formed over substantially the entire length and fixedly hung from the lower surface of the front and rear moving plate 41 of the support member 37. In 52, the long side end of the starting arm 51 is formed into a long hole.
Vertical arm 53 that is fitted and connected so that it can slide along 52
And a cam A46 that is rotated by the main motor 44.
The vertical swinging motion of the swinging arm A48 along the cam floor causes a longitudinal movement on the long side of the starting arm 51 with the pivot shaft 49 as a fulcrum to move the carrier base E through the longitudinal movement plate 41. It is moved from the carry-in section A to the lower side of the packaging section B (from the state of FIG. 5 to the state of FIG. 6), and from the lower side of the packaging section B to the carry-in section A.
It is configured to move to the lower part of.

On the other hand, the vertical operation portion F-2 is connected to the cam B54 attached to the cam shaft 45 and is connected to the cam B54 so that the rear end shaft support portion 55 is used as a fulcrum by the cam B54 to move the front end side, that is, the swing end. It comprises a swing arm B56 which swings up and down, and a connecting arm B57 which is attached by pivotally connecting the ends of the swing arm B56 and the vertical movement frame 39 of the support member 37. By the vertical swing motion of the swing arm B56 swinging end along the cam floor of the cam B54 which is rotated by the main motor 44, the transport base E is moved to the loading section A and the packaging section B via the vertical moving frame 39, respectively. It is configured to move up and down in. That is, in the loading section A, the state of FIG. 1 rises to the state of FIG. 5, and in the packaging section B, the state of the solid line of FIG. 6 rises to the state of the chain double-dashed line of FIG. It is configured so as to descend from the state of the chain line to the state of the solid line in FIG. In the figure, reference numeral 58 denotes a spring stretched over the apparatus frame 3 from the middle of the swing arm B56 in the longitudinal direction. The spring 58 suspends the swing arm B56 and moves the carrier table E upward. It sometimes serves to reduce the load on the main motor 44.

Next, a packaging method using the packaging apparatus configured as described above will be described with reference to FIGS. 5 to 20. The product 1 is placed on the carry-in section A and the operation switch of the apparatus is turned on.
Then, after the weighing by the weighing device 5 is completed, the operation is started, and first, the transport table E waiting under the loading section A is
Is lifted by the vertical operation unit F-2 to receive the product 1 from the carry-in unit A (the state shown in FIG. 5), and at the same time, the carrier E is kept at its height by the horizontal operation unit F-1 and packaged by the horizontal operation unit F-1. The product 1 is moved to the lower side of B and the product 1 is conveyed to the lower side (state of FIG. 6). At this time, the film withdrawing mechanism C-1 (in the state shown in FIG. 7) that holds the front edge 2a of the film 2 starts the film withdrawing operation at substantially the same timing, and the film withdrawing mechanism has a predetermined length according to the size of the product 1. When the film 2 is pulled out to the packaging section B and the pulling out of the film 2 is completed (state of FIG. 8),
The rear clamp mechanism C-2 moves from the standby position above and below the film leading edge holding portion H to grip the trailing edge 2b of the film 2 (from the state of FIG. 8 to the state of FIG. 10). After that, the film 2 is separated by the film cutting mechanism N between the film front end holding portion H and the rear clamp mechanism C-2 (state of FIG. 11), and the film is pulled out at a predetermined timing after the film 2 is separated. Device C-1 and rear clamp mechanism
C-2 and C-2 are moved at the same time and at the same speed to perform centering of the wrapping part B to a predetermined position (state of FIG. 12), and at the same time, during this moving process or after completion of centering, the film drawing mechanism C- 1 and rear clamp mechanism C-2
Pre-stretching is performed to stretch the film 2 in the front-back direction by a predetermined amount due to the difference in the moving distance between the film 2 and the left and right side edges 2C of the film 2 and the left and right clamp mechanism D
The movable clamp plate 19 raised by the cylinder 18 and the left and right folding plates 27 are gripped (states of FIGS. 13 (a) and 13 (b)). A direction in which the left and right folding plates 27 are separated from each other together with the movable clamp plates 19 of the left and right clamp mechanism D by the operation of the motor 33 of the clamp moving mechanism M that starts the operation at the same time as or at a predetermined timing after the end of the gripping operation. The pre-stretching is performed to move the film 2 to a predetermined amount in the width direction (Fig. 14).
(A), (b) states), the film 2 pulled out to the packaging part B is held in the four edges of the front edge 2a, the rear edge 2b, and the left and right side edges 2c while being pre-stretched in the front-rear, left-right directions. It

The carrier E moved to the lower side of the packaging section B is pushed up toward the film 2 of the packaging section B by the vertical operation section F-2 and supplies the product 1 to the packaging section B (FIG. 6).
The two-dot chain line and the state of FIG. 16). When the top of the product 1 is raised to a predetermined height position detected by the sensor I in the process of the product 1 being pushed up by the film 2, the control means detects the film moving mechanism M based on the detection signal of the sensor I. When a signal is output to the motor 33, the motor 33
When the motor 33 is actuated, the left and right folding plates 27 are moved in the folding direction in which they approach each other together with the movable clamp plates 19 of the left and right clamp mechanism D, and the extension amount in the width direction of the film 2 is reduced (state of FIG. 15). At a predetermined timing, the movable clamp plate 19 is separated from the left and right folding plates 27 by the air cylinder 18 and the left and right edges of the film 2 are released (state of FIG. 17). The left and right folding plates 27, which continuously move in the folding direction, allow the left and right edges of the film 2 to move.
2c is folded into the bottom side of the product 1 (state of FIG. 18), and when the left and right edges of the film 2 are released, the front and rear folding plates 22 start moving in the folding direction at substantially the same time, and at the same time, the film withdrawing mechanism C -1 and the rear clamp mechanism C-2 move in the folding direction toward each other, and the folding edges of the front and rear folding plates 22 abut each other (Figs. 19 (a) and (b)).
State) When the heat sealing is completed, a series of packaging operation for packaging the product 1 is completed at this point. The product 1 that has been heat-sealed and packaged is stopped and waits with the gaps between the colliding edges slightly separated from each other. The operator takes it out from the front and rear folding plates 15 (state of FIG. 20) and attaches a label or the like. Is. When these series of wrapping operations are completed, the transport table E, the film pull-out mechanism C-1 and the rear clamp mechanism C-
The item 2 is returned to the initial standby position, and thereafter the above-described operation is repeated to package the product 1.

Although the left and right folding plates 27 are used as the fixed clamp plates of the left and right clamp mechanism D in the above-mentioned embodiment, it goes without saying that the fixed clamp plates may be separately provided.

[0022]

As described above, in the packaging apparatus of the present invention, when the film is drawn out and transferred to the predetermined position of the packing section by the film transfer mechanism, both widthwise edges of the film intersect the drawing direction. The film is gripped by the left and right clamp mechanisms arranged on both sides of the wrapping section, and then the left and right clamp mechanisms are moved in the directions away from each other to stretch the film by a predetermined amount (pre-stretch), and at the same time, the film is removed from below the film. When the top of the packaged part is detected by the sensor during the ascending process, the right and left clamp mechanisms are moved toward each other and the film is stretched. Since the amount can be reduced appropriately, it is possible to adjust the stretch amount of the film according to the shape and size (height) of the packaged item. It was a stretch packaging equipment. Therefore, without stretching the film unnecessarily, it is possible to always wrap the object to be wrapped in a correct and good packaging form with an appropriate amount of tension and strength that does not cause wrinkles on the surface, and at the same time Since it can be packaged with a certain amount of tension and strength, when using a soft tray or when the shape is not uniform, multiple (bulk) items to be packaged such as cucumber and carrot are used in the tray. It was possible to provide a packaging device that is also effective for a so-called Notley-type packaging mode in which the packaging can be performed beautifully without breaking the arrangement even if it is packaged without it. Further, since the left and right folding plates are used as the fixed clamp plates of the left and right clamp mechanism, the structure of the left and right clamp device is simplified, and the device itself can be greatly simplified to reduce its manufacturing cost. .

[Brief description of drawings]

FIG. 1 is a side view showing an example of implementation of a packaging device of the present invention.

FIG. 2 is a perspective view of a main part showing a film transfer mechanism (a film pull-out mechanism and a rear clamp mechanism) in a packaging unit.

FIG. 3 is a perspective view of a main part showing a front, rear, left and right folding mechanism in a packaging unit.

FIG. 4 is a perspective view of a main part showing a carrier and a drive mechanism thereof.

FIG. 5 is a schematic view of a state where the carrier receives the article to be packaged from the carry-in section.

FIG. 6 is a schematic view of a state in which the carrier table on which the article to be packaged is placed is moved to the lower side of the packaging section

FIG. 7 is a schematic view of a state in which the leading edge of the film is held by the film pull-out mechanism of the film transfer mechanism.

FIG. 8 is a schematic view of a state where a film having a predetermined length is pulled out.

FIG. 9 is a schematic view of a state in which the rear clamp mechanism of the film transport mechanism is moved from the standby position to a position where the trailing edge of the film is gripped.

FIG. 10 is a schematic view showing a state in which the film is held by the rear clamp mechanism.

FIG. 11 is a schematic diagram of a state in which the film is separated between the film front end holding portion and the rear clamp mechanism by the film cutting mechanism.

FIG. 12 is a schematic view of a state in which the film is transferred to a predetermined position of the packaging unit by the film transfer mechanism.

[Fig. 13] Fig. 13 is a schematic view showing a state where both side edges of the film in the width direction are held by the left and right folding plates and the left and right clamp mechanism.
Is its plan view, (b) is the same vertical section front view

[Fig. 14] Fig. 14 is a schematic view of a state in which the film is stretched (pre-stretched) by a predetermined amount in the width direction, (a) is a plan view thereof, and (b) is a longitudinal front view thereof.

FIG. 15 is a state in which the top of the article to be packaged is raised to a height detected by the sensor, and the top and bottom of the sensor detect that the left and right clamp mechanisms are moved in the direction of approaching together with the left and right folding plates to reduce the extension amount of the film. Schematic of the closed state

[Fig. 16] A schematic view of a state where the object to be packaged is lifted up and pushed up by the film of the packaging section.

FIG. 17 is a schematic diagram showing a process of folding the left and right side edges of the film by the left and right clamp mechanism after the holding state of the right and left side edges of the film is released.

[Fig. 18] A schematic view of a state in which the left and right edges of the film are folded to the bottom side of the package by the left and right folding plates.

FIG. 19 is a schematic view of a state in which the front and rear edges of the film are folded by the front and rear folding plates, (a) is a plan view thereof, and (b) is a vertical side view thereof.

[Fig. 20] Schematic view of a state in which the packaged object is taken out from the front and rear folding plates.

[Explanation of symbols]

1 ... Object to be packaged (product) 2 ... Film 2a ... Film leading edge 2b ... Film trailing edge 2c ... Left and right side edges of film A ... Loading section B ... Packaging section C ... Film transfer mechanism C-1 ... Film pulling mechanism C-2… Rear clamp mechanism D… Left and right clamp mechanism I… Sensor J… Reflector plate K… Front and back folding mechanism L… Left and right folding mechanism 27… Left and right folding plate

Claims (2)

[Claims] 1. A covers the upper surface of the material to be packaged pushing up raising the material to be packaged toward the film from the bottom of the film being drawn to the packaging section stretching waiting in the film, then the packaging end of the film In a packaging device that folds into the bottom of an object, a film transport mechanism that transports the film to a predetermined position of the packaging unit and both sides of the packaging unit that intersects the film withdrawing direction are arranged at the predetermined position of the packaging unit. A left and right clamp mechanism that holds both side edges of the transferred film in the width direction, a clamp moving mechanism that moves the left and right clamp mechanisms in an approaching or separating direction, and is arranged on the lower side of the packaging unit.
A sensor for detecting the top at a predetermined position before the top of the package comes into contact with the film and is pushed up toward the film that has been pulled out to the packaging unit and is waiting to be stretched; Before the top is detected, the left and right clamp mechanisms are moved in directions away from each other to extend the film by a predetermined amount, and when the top of the package is detected by the sensor, the left and right clamp mechanisms are moved toward each other. A stretch wrapping device comprising: a control unit that moves the film to reduce the amount of stretching of the film. 2. The stretch wrapping apparatus according to claim 1, wherein the left and right clamp mechanism is composed of an upper clamp plate and a lower clamp plate, and the upper clamp plate is a left and right folding plate.