JP5666943B2 - Stretch packaging equipment - Google Patents

Description

  The present invention relates to a stretch wrapping apparatus.

  Conventionally, a stretch packaging apparatus is known as an apparatus for packaging an object to be packaged such as fresh food. The stretch wrapping apparatus holds a film cut to a predetermined length in tension, and presses the object to be packaged against the film so that the object to be packaged adheres to the film. After that, the stretch wrapping apparatus folds the peripheral edge of the film on the back surface of the packaged object, and then heat seals to package the packaged object.

  In recent years, for example, a stretch wrapping apparatus including a plurality of roll holding units has been proposed as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-95208). Specifically, the film roll is arrange | positioned at the both sides of the main body (packing part) which packages a to-be-packaged object, and a film is sent out from the film roll with which any one roll holding part was loaded. A film delivery mechanism is provided for each film roll. The film delivery mechanism grips the leading edge of the film, and then delivers the leading edge of the film to the film transport mechanism. Therefore, the stretch wrapping apparatus described in Document 1 can continuously wrap articles having different sizes by loading film rolls having different film widths into the plurality of roll holding units.

  By the way, when the said technique is employ | adopted, several space for installing a roll holding | maintenance part is needed. Therefore, it is difficult to meet the need for space saving. In addition, when a plurality of spaces are located away from each other, the film roll replacement work is also complicated.

  The subject of this invention is providing the stretch wrapping apparatus which responds to the need of space saving and improves the operativity of a wrapping apparatus.

The stretch wrapping apparatus according to the present invention includes a wrapping section, a transport mechanism, and a film delivery mechanism. The packaging unit holds the first film or the second film in tension and presses the first film or the second film relatively against the article, and wraps the article with the first film or the second film. The transport mechanism transports the first film or the second film to the packaging unit. The film delivery mechanism selectively delivers either the first film or the second film to the transport mechanism. The film delivery mechanism includes a first film gripping part, a second film gripping part, and a switching part. The first film gripping part grips the first film. The second film gripping part grips the second film. The switching unit switches between the first posture, the second posture, and the third posture. The first posture is a posture in which the first film gripping section delivers the first film to the transport mechanism. The second posture is a posture in which the second film gripping section delivers the second film to the transport mechanism. The third posture is a posture in which the first film can be gripped by the first film gripping portion. Furthermore, the film delivery mechanism further includes a support shaft. The support shaft supports the first film gripping portion and the second film gripping portion. The switching unit switches to any one of the first posture, the second posture, and the third posture by changing the rotation angle of the support shaft. Thereby, while saving space, the operativity of film roll loading can be improved.

Moreover , it is preferable that a 3rd attitude | position is an attitude | position which can also make a 2nd film holding part hold | grip a 2nd film. Thereby, replacement and replacement of the film can be further facilitated.

  Further, in the first posture, the distance from the tip of the first film gripping portion to the transport mechanism is closer than the distance from the second film gripping portion to the transport mechanism, and in the second posture, the transport from the tip of the second film gripping portion. The distance to the mechanism is closer than the distance from the first film gripping portion to the transport mechanism, and the third posture is the distance from the tip of the first film gripping portion to the transport mechanism than the first posture and the second posture. And it is preferable that the distance from the front-end | tip of a 2nd film holding part to the conveyance mechanism is long. By switching the posture of the gripping portion to the third posture, the film can be easily gripped by the film gripping portion.

  Moreover, it is preferable that a 1st film holding part contains a 1st board member and a 2nd board member. The second plate member is a member that can approach and separate from the first plate member. Moreover, it is preferable that a 2nd film holding part contains a 3rd board member and a 4th board member. The fourth plate member is a member that can approach and separate from the third plate member. Here, the first film is held between the first plate member and the second plate member, and the second film is held between the third plate member and the fourth plate member. This makes it easy to change the film in a narrow space.

  Further, the support shaft supports the first plate member and the third plate member at positions close to each other, and the second plate member moves in the first direction, thereby approaching the first plate member, and the fourth plate. The member preferably moves closer to the third plate member by moving in a second direction that is the opposite direction of the first direction. Thereby, the space required for loading the film into the first film gripping portion and loading the film into the second film gripping portion can be reduced.

  The stretch wrapping apparatus according to the present invention can save space and improve the operability of film roll loading.

1 is an external perspective view of a stretch wrapping apparatus according to the present invention. It is a front schematic diagram inside a stretch wrapping apparatus. It is the III-III arrow schematic diagram of FIG. It is the schematic of a roll holding mechanism. It is the elements on larger scale of a roll holding mechanism. It is a figure which shows arrangement | positioning of the lower stage belt of a roll holding mechanism. It is a figure which shows arrangement | positioning of the upper stage belt of a roll holding mechanism. It is a plane outline figure of a stretch packing device. It is an external appearance perspective view of a film delivery mechanism (at the loading position). It is an external appearance perspective view of a film delivery mechanism (at the 1st feeding position). It is an external appearance perspective view of a film delivery mechanism (at the 2nd feeding position). It is a schematic block diagram of a loading unit. It is a side view of a 1st film holding unit. It is the elements on larger scale of a film sending mechanism, a cutting mechanism, and a film conveyance mechanism. It is a side view of a feeder unit. It is a figure which shows arrangement | positioning of the upper belt and lower belt in a feeder unit. It is a plane arrangement view of an introduction unit and a clamp. It is a block block diagram of a control apparatus. It is operation | movement explanatory drawing of a stretch wrapping apparatus. It is operation | movement explanatory drawing of a stretch wrapping apparatus. It is operation | movement explanatory drawing of a stretch wrapping apparatus. It is operation | movement explanatory drawing of a stretch wrapping apparatus. It is a figure which shows the flow which shows the operation | movement in a film delivery mechanism. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process. It is a figure which shows the operation | movement in a film delivery process.

(1) Overall Configuration FIG. 1 shows a film transverse feed type stretch wrapping apparatus according to an embodiment of the present invention. The stretch wrapping apparatus 1 pushes up a fresh food product (article) G placed on the tray T against the tension-held film (stretch film), and folds the periphery of the film to the bottom side of the tray T. This is an apparatus for film-wrapping a package (article G placed on the tray T). The stretch wrapping apparatus 1 has a weighing function and a priced function by labeling in addition to a film wrapping function. The stretch wrapping apparatus 1 includes an input port IS and a discharge port OS on the front surface of the main body 1a. The insertion port IS is disposed below the front surface of the main body 1a. The take-out port OS is disposed above the input port IS. After the article G (or the article G and the tray T) is introduced from the insertion port IS, a series of film packaging processes are performed. The article G (packaged product) that has undergone the packaging process is taken out from the outlet OS.

  As shown in FIG. 1 or FIG. 2, the stretch wrapping apparatus 1 includes a weighing-in mechanism 2, a packaging station 3, a roll holding mechanism 4, a film delivery mechanism 5, a film transport mechanism 6, a cutter mechanism 7, And a sealing mechanism 8. The stretch wrapping apparatus 1 further includes a control device 9 for controlling each mechanism included in the stretch wrapping apparatus 1. Each mechanism included in the stretch wrapping apparatus 1 is housed in the main body 1a and the casing 1b of the stretch wrapping apparatus 1. The casing 1b is attached to the side part of the main body 1a. The casing 1b is provided with a lid 1c and a lid 1d used when the film rolls R1 and R2 are loaded into the casing 1b. Hereinafter, each component included in the stretch wrapping apparatus 1 will be described in detail.

  In the following description, “left and right” means right and left as viewed from the front of the main body 1 a of the stretch wrapping apparatus 1. Moreover, when describing as film F1, F2, it means the arbitrary one of film F1 and film F2, and when describing as film roll R1, R2, film roll R1 and film roll R2 Any one film roll is meant. Moreover, the width direction of a film means the same direction as the width direction of film roll R1, R2, and the length direction of a film means the direction which cross | intersects the width direction of a film. Further, upstream means upstream in the film transport direction, and downstream means downstream in the film transport direction.

(2) Detailed configuration (2-1) Configuration of weighing-in mechanism The weighing-in mechanism 2 measures the article G, and then conveys the article G to the packaging station 3. The weighing-in mechanism 2 is provided in front of the main body 1a. Specifically, the weighing-in mechanism 2 is provided at the insertion port IS.

  As shown in FIG. 3, the weighing-in mechanism 2 includes a weighing device 2 a and a loading belt 2 b. The weighing device 2a measures the weight of the fresh food product (article) G placed on the tray T. The carry-in belt 2b is stretched between a pair of rollers. The carry-in belt 2b is provided with a conveyance protrusion. When the tray T (packaged item) containing the article G is placed on the measuring instrument 2a, the weight of the article G is measured by the measuring instrument. Thereafter, the article to be packaged is pushed by the protrusion of the carry-in belt and is sent onto a support member 33 of a lifter mechanism 30 (described later) of the packaging station 3.

(2-2) Packaging station The packaging station 3 is a space formed in the main body 1a. The article to be packaged is packaged in the packaging station 3. The packaging station 3 is a space where a series of film packaging processes are performed on an article to be packaged measured by the weighing-in mechanism 2 described above. In the packaging station 3, a lifter mechanism 30 and a folding mechanism 37 are arranged.

(2-2-1) Lifter Mechanism The lifter mechanism 30 holds the bottom surface of the tray T and moves the tray T and the article G upward. Moreover, the lifter mechanism 30 pushes up an object to be packaged against stretch films (stretched films) F1 and F2 held in tension by a film transport mechanism 6 described later (see FIG. 17). The lifter mechanism 30 is provided below the packaging station 3.

  As shown in FIGS. 2 and 3, the lifter mechanism 30 includes a support base 31, a plurality of support bars 32, a support member 33, and an electric ball screw mechanism 34. The support base 31 is a member that fixes a plurality of support bars 32. The support bar 32 is fixed to the upper surface of the support base 31. Each support bar 32 includes a hinge that bends forward, backward, left, and right. A hinge is provided at the central portion of each support bar 32. Due to the hinge, each support bar 32 temporarily falls when left and right folding plates 76 and 77 and a rear folding plate 78 described later enter the lower portion of the tray T. The support member 33 is a member that receives the bottom surface of the tray T. The support member 33 is rotatably supported on the upper end portion of each support bar 32. The electric ball screw mechanism 34 is connected below the support base 31 and moves the support base 31 up and down.

(2-2-2) Folding mechanism The folding mechanism 37 folds the portions around the films F1 and F2 on the bottom surface side of the packaged object pushed up by the lifter mechanism 30 (that is, the bottom surface side of the tray T). Thereby, the films F1 and F2 cover the tray T and the article G.

  2 or 3, the folding mechanism 37 mainly includes left and right folding plates 76 and 77, a rear folding plate 78, and a front folding rod 79.

  The left and right folding plates 76 and 77 fold both ends of the films F1 and F2 in the film transport direction to the bottom surface side of the tray T. The left and right folding plates 76 and 77 can be moved horizontally in the length direction of the films F1 and F2 by a motor and a timing belt (not shown).

  The rear folding plate 78 folds the side portions on the back side in the width direction of the films F1 and F2 to the bottom surface side of the tray T. The rear folding plate 78 can be moved horizontally in the width direction of the films F1, F2 by a motor and a timing belt (not shown).

  The front folding bar 79 folds the side portion on the front side in the width direction of the films F1 and F2 to the bottom surface side of the tray T. The front folding bar 79 folds the film F to the bottom side of the tray T when the tray T is discharged to the seal mechanism 8 side by the discharge pusher 79a.

(2-3) Roll holding mechanism The roll holding mechanism 4 is installed in the casing 1b as shown in FIGS. The roll holding mechanism 4 is configured to hold two film rolls R1 and R2. A plurality of stretch films F1 and F2 having a predetermined width are wound around the film rolls R1 and R2. Here, the stretch films F1 and F2 wound around the film rolls R1 and R2 may have the same width or different widths. Further, the stretch films F1 and F2 wound around the film rolls R1 and R2 may be the same type (material, thickness, etc.) or different types.

  As shown in FIG. 4, the roll holding mechanism 4 mainly includes a roll holding unit 40 and a roll driving unit 43.

(2-3-1) Roll Holding Unit The roll holding unit 40 includes an upper roll holding unit 41 and a lower roll holding unit 42. The upper roll holding unit 41 holds the film roll R1 (first roll), and the lower roll holding unit 42 holds the film roll R2 (second roll).

  The upper roll holder 41 is disposed above the lower roll holder 42. Moreover, the upper side roll holding | maintenance part 41 and the lower side roll holding | maintenance part 42 are arrange | positioned in the position shifted to right and left by planar view. Specifically, the upper roll holding portion 41 is disposed at a position close to the main body 1a in the casing 1b. On the other hand, the lower roll holding part 42 is arranged at a position away from the main body 1a in the casing 1b. That is, the upper roll holding part 41 is disposed at a position closer to the main body 1 a than the lower roll holding part 42.

(A) Upper roll holding part The upper roll holding part 41 includes an upper roll bar 41a and an upper holder 41b.

  The upper roll bar 41a is a member that holds the film roll R1. The upper roll bar 41a has a predetermined length so that a plurality of film rolls R1 having different film widths can be loaded. The upper roll bar 41a extends from the other side of the casing 1b toward the front side when viewed from the front. The upper roll bar 41a has a first end and a second end. The first end is rotatably supported by a support plate 49 disposed on the other side of the casing 1b. An upper pulley 41c is attached to the first end. An upper belt 41d is hung on the upper pulley 41c (see FIG. 7). An upper holder 41b is attached to the second end. The film roll R1 loaded on the upper roll bar 41a is fixed to the upper roll bar 41a by the upper holder 41b.

(B) Lower roll holding part Similarly to the upper roll holding part 41, the lower roll holding part 42 also includes a lower roll bar 42a and a lower holder 42b. The configurations 41a and 41b included in the upper roll holding unit 41 and the configurations 42a and 42b included in the lower roll holding unit 42 are the same. Therefore, description of each structure 42a, 42b included in the lower roll holding part 42 is omitted. In addition, the lower roll holding part 42 is a member that holds the film roll R2. An upper pulley 42c is attached to the first end of the lower roll bar 42a, and an upper belt 42d is hung on the upper pulley 42c (see FIG. 7).

(2-3-2) Roll Driving Unit The roll driving unit 43 selectively rotates the upper roll holding unit 41 and the lower roll holding unit 42, and the film F1 or the film roll R1 or the film roll R2 from either one of the film roll R1 and the film roll R2. The film F2 is fed out. The roll drive unit 43 is disposed below the lower roll holding unit 42 (see FIG. 4).

  As shown in FIG. 5, the roll drive unit 43 mainly includes a roll drive motor 431, an upper roller drive mechanism 44, and a lower roller drive mechanism 45.

(A) Roll drive motor The roll drive motor 431 can rotate forward and backward. The roll drive motor 431 is connected to a first gear 44a of an upper roller drive mechanism 44 described later. The roll drive motor 431 drives the upper roll holding unit 41 during forward rotation and drives the lower roll holding unit 42 during reverse rotation. That is, during forward rotation, the roll drive motor 431 drives the upper belt 41d that is hung on the upper pulley 41c described above. Further, during reverse rotation, the roll drive motor 431 drives the upper belt 42d hung on the upper pulley 42c.

(B) Upper roller driving mechanism The upper roller driving mechanism 44 is a mechanism for rotating the upper roller holding portion 41. As shown in FIG. 5, the upper roller driving mechanism 44 mainly includes a first gear 44a, a lower timing pulley 44b, an intermediate first timing pulley 44c, an intermediate second timing pulley 44d, an idler pulley 44e, and a one-way. A clutch 44f and a brake 44g are included.

  The first gear 44a is connected to the roll drive motor 431 described above. A lower timing pulley 44b is attached to the first gear 44a. Above the lower timing pulley 44b, an intermediate first timing pulley 44c and an intermediate second timing pulley 44d for transmitting the rotation of the first gear 44a to the upper roller holding portion 41 are disposed. The middle first timing pulley 44c and the middle second timing pulley 44d are attached to both ends of the shaft 44h.

  As shown in FIG. 6, a lower belt 41e is hung on the lower timing pulley 44b and the middle first timing pulley 44c. Further, as shown in FIG. 7, an upper belt 41d is hung on the middle second timing pulley 44d and the upper pulley 41c. A tension roller 41f is provided between the middle second timing pulley 44d and the upper pulley 41c. The idler pulley 44e is disposed between the middle first timing pulley 44c and the lower timing pulley 44b, and adjusts the tension of the lower belt 41e.

  The one-way clutch 44f regulates the rotation direction of the shaft 44h. In the present embodiment, the one-way clutch 44f restricts the shaft 44h from rotating counterclockwise. That is, the shaft 44h rotates only clockwise. Thereby, the upper roll bar 41a of the upper roller holding portion 41 rotates clockwise with respect to the paper surface of FIG. 2, and the film F1 is drawn from the film roll R1.

  The brake 44g is a disc brake. The brake 44g is attached to the shaft 44h. The brake 44g suppresses the rotation of the shaft 44h. Specifically, the brake 44g suppresses the rotation of the shaft 44h when the driving of the lower roll holding portion 42 (use of the film roll R2) is selected by the control device 9 described later.

(C) Lower roller driving mechanism The lower roller driving mechanism 45 is a mechanism that rotationally drives the lower roller holding portion 42. As shown in FIG. 5, the lower roller drive mechanism 45 mainly includes a second gear 45a, a lower timing pulley 45b, an intermediate first timing pulley 45c, an intermediate second timing pulley 45d, an idler pulley 45e, A one-way clutch 45f and a brake 45g are included.

  The second gear 45a is configured to mesh with the first gear 44a. That is, the second gear 45a rotates in a direction different from the rotation direction of the first gear 44a. A lower timing pulley 45b is attached to the second gear 45a. Above the lower timing pulley 45b, an intermediate first timing pulley 45c and an intermediate second timing pulley 45d for transmitting the rotation of the second gear 45a to the lower roller holding portion 42 are disposed. The middle first timing pulley 45c and the middle second timing pulley 45d are attached to both ends of the shaft 45h.

  As shown in FIG. 6, a lower belt 42e is hung on the lower timing pulley 45b and the middle first timing pulley 45c. Further, as shown in FIG. 7, an upper belt 42d is hung on the middle second timing pulley 45d and the upper pulley 42c. The idler pulley 45e is disposed between the middle first timing pulley 45c and the lower timing pulley 45b, and adjusts the tension of the lower belt 42e.

  The one-way clutch 45f regulates the rotation direction of the shaft 45h. In the present embodiment, the one-way clutch 45f restricts the shaft 45h from rotating counterclockwise. That is, the shaft 45h rotates only clockwise. Thereby, the lower roll bar 42a of the lower roller holding part 42 rotates clockwise with respect to the paper surface of FIG. 2, and the film F2 is drawn from the film roll R2.

  The brake 45g is a disc brake. The brake 45g is attached to the shaft 45h. The brake 45g suppresses the rotation of the shaft 45h. Specifically, the brake 45g suppresses the rotation of the shaft 45h when the driving of the upper roll holding unit 41 (use of the film roll R1) is selected by the control device 9 described later.

(2-4) Film Delivery Mechanism The film delivery mechanism 5 transfers the film F1 drawn from the film roll R1 or the film F2 drawn from the film roll R2 to a pair of feeder units 61 and 62 of the film transport mechanism 6 described later. It is a mechanism for delivery.

  The film delivery mechanism 5 is also installed in the casing 1b as shown in FIGS. As shown in FIG. 2 or FIGS. 9A to 9C, the film delivery mechanism 5 mainly includes a loading unit moving frame 51, a loading unit 70, and a loading unit drive motor 52.

(2-4-1) Loading Unit Moving Frame The loading unit moving frame 51 is disposed above the casing 1b (see FIGS. 9A to 9C). That is, the loading unit moving frame 51 is disposed above the roll holding mechanism 4. The loading unit moving frame 51 rotatably supports a loading unit rotating shaft 70a described later. Further, the loading unit moving frame 51 can be moved horizontally by a link mechanism. Specifically, the loading unit moving frame 51 moves at a predetermined timing between a first position farthest from the film transport mechanism 6 described later and a second position closest to the film transport mechanism 6. Here, the predetermined timing is a timing at which the loading unit 70 sends out the films F1 and F2 to the film transport mechanism 6 described later.

(2-4-2) Loading Unit The loading unit 70 is attached to the loading unit moving frame 51 as shown in FIGS. 9A to 9C. That is, the loading unit 70 is disposed above the film roll R1 and the film roll R2.

  The loading unit 70 mainly includes a first gripping unit 71, a second gripping unit 72, and a loading unit rotating shaft 70a. The first gripping unit 71 and the second gripping unit 72 are attached to the loading unit rotating shaft 70a.

  As shown in FIG. 10, the first gripping unit 71 and the second gripping unit 72 are disposed at positions symmetrical with respect to the reference line L. Here, the reference line L is a perpendicular line extending virtually from the center of the loading unit rotating shaft 70a along the height direction of the loading unit moving frame 51. That is, the reference line L extends in a direction orthogonal to the transport surfaces of the films F1 and F2. The first gripping unit 71 and the second gripping unit 72 have a V shape in a side view. The distance from the first gripping unit 71 to the second gripping unit 72 is always constant.

  The first gripping unit 71 and the second gripping unit 72 are selectively used depending on the type of film to be used (film F1 or film F2). Specifically, the first gripping unit 71 is a unit that grips the film F1. On the other hand, the second gripping unit 72 is a unit that grips the film F2. The first holding unit 71 and the second holding unit 72 have a predetermined length in the depth direction of the casing 1b so that the films F1 and F2 having different film widths can be sent out.

  The 1st holding | grip unit 71 is arrange | positioned in the position close | similar to the main body 1a within the casing 1b. That is, as shown in FIG. 2, the first gripping unit 71 is disposed at a position close to the cutter mechanism 7 and the film transport mechanism 6. On the other hand, the 2nd holding | grip unit 72 is arrange | positioned in the position away from the main body 1a within the casing 1b. In other words, the first gripping unit 71 is disposed at a position closer to the main body 1 a than the second gripping unit 72.

  As with the upper roll bar 41a and the lower roll bar 42a, the loading unit rotating shaft 70a extends from the far side of the casing 1b toward the near side when viewed from the front. The loading unit rotating shaft 70a is rotatably supported with respect to the loading unit moving frame 51. The loading unit rotating shaft 70a is driven by a loading unit drive motor 52 described later (see FIG. 2). By changing the rotation angle of the loading unit rotation shaft 70a, the loading unit 70 changes its posture (see FIGS. 9A to 9C). The posture of the loading unit 70 includes a first posture, a second posture, and a third posture.

  The first posture is a posture in which the first gripping unit 71 delivers the film F1 to the film transport mechanism 6 (first feeding position). In the first posture, the distance from the front end of the first gripping unit 71 to the film transport mechanism 6 is closer than the distance from the front end of the second gripping unit 72 to the film transport mechanism 6. Specifically, when the loading unit 70 is in the first posture, the first gripping unit 71 is tilted until it becomes parallel to the horizontal plane (see FIG. 9B). The film F <b> 1 is sent out in the horizontal direction from the front end of the first gripping unit 71 to the film transport mechanism 6.

  The second posture is a posture in which the second gripping unit 72 delivers the film F2 to the film transport mechanism 6 (second feeding position). In the second posture, the distance from the tip of the second gripping unit 72 to the film transport mechanism 6 is closer than the distance from the tip of the first gripping unit 71 to the film transport mechanism 6. Specifically, when the loading unit 70 is in the second posture, the second gripping unit 72 is tilted until it becomes parallel to the horizontal plane (see FIG. 9C). The film F <b> 2 is fed out in the horizontal direction from the tip of the second gripping unit 72 to the film transport mechanism 6.

  The third posture is a posture that enables the first gripping unit 71 to grip one film F1 (loading position). The third posture is also a posture that enables the second gripping unit 72 to grip the film F2. In the third posture, the distance from the first grip unit 71 to the film transport mechanism 6 and the distance from the second grip unit 72 to the film transport mechanism 6 are longer than when the first posture and the second posture are taken. In other words, the loading unit rotation shaft 70a is rotated so that the first gripping unit 71 and the second gripping unit 72 are positioned symmetrically with respect to the reference line L (see FIG. 9A).

  Next, the configuration of the first gripping unit 71 and the second gripping unit 72 will be described in detail with reference to FIGS. 10 and 11.

(A) First Holding Unit The first holding unit 71 is a unit that holds the film F1. The first gripping unit 71 extends along the longitudinal direction of the film rolls R1 and R2. The length of the 1st holding | grip unit 71 is longer than the length of film roll R1, R2.

  As shown in FIG. 11, the first gripping unit 71 mainly includes two plate members (corresponding to a first plate member and a second plate member) 157 and 158 and a one-way roller 159.

(A-1) Plate member The plate members 157 and 158 are formed with a plurality of notches 53a to 53h, respectively. The notches 53a to 53h are spaces for holding the film F1 by inserting an upper belt 24 and a lower belt 23 described later when the film F1 is transferred to the film transport mechanism 6. Further, the plate members 157 and 158 have uneven portions 157a and 158a on the surface facing the film F1 (see FIG. 10).

  Furthermore, as shown in FIG. 10, the top surface (upper surface) TF of the plate member 158 is buffed. Thereby, when the film F1 is cut by the cutting blade 7a of the cutter mechanism 7 described later, the film F1 is held in close contact with the top surface TF of the plate member 158. Further, the corner ED on the outer side of the top surface TF where the plate member 158 is buffed is further filed.

  One end of each of the two plate members 157 and 158 is connected by a hinge (not shown). The plate member (corresponding to the second plate member) 158 rotates with respect to the plate member 157 around the hinge portion. Specifically, the plate member 158 can approach and separate from the plate member (corresponding to the first plate member) 157. That is, the plate member 158 can be opened and closed with respect to the plate member 157. A state indicated by a dotted line in FIG. 8 represents an open state of the plate member 158. As shown in FIG. 8, the plate member 158 is opened by rotating in a direction approaching the main body 1a (corresponding to the first direction).

(A-2) One-way roller The one-way roller 159 is a roller that allows rotation in only one direction (see arrow A1 in FIG. 10). A plurality of one-way rollers 159 are provided along the longitudinal direction (film width direction) of the plate member 157. The one-way roller 159 holds the film F so that the film F1 sandwiched between the plate members 157 and 158 does not fall down. The one-way roller 159 has a resin main body plated with nickel or the like.

  The surface of the one-way roller 159 protrudes closer to the plate member 158 than the surface of the plate member 157. Therefore, the film F1 sandwiched between the plate members 157 and 158 always comes into contact with the one-way roller 159. Thus, even when the film F1 sandwiched and held between the plate member 157 and the plate member 158 is separated from the film F1 conveyed to the film conveyance mechanism by the cutter mechanism 7 described later, the one-way roller 159 Retained.

(B) Second gripping unit The second gripping unit 72 is a unit that grips the film F2. The second gripping unit 72 extends along the longitudinal direction of the film rolls R1, R2. The length of the second gripping unit 72 is longer than the length of the film rolls R1 and R2.

  The second gripping unit 72 has a configuration similar to that of the first gripping unit 71. That is, the second gripping unit 72 mainly includes two plate members (corresponding to a third plate member and a fourth plate member) 257 and 258 and a one-way roller 259. Therefore, hereinafter, a configuration different from the configuration of the first gripping unit 71 will be described.

(B-1) Plate member The plate members 257 and 258 have uneven portions 257a and 258a on the surface facing the film F2. Of the two plate members 257 and 258, the plate member (corresponding to the fourth plate member) 258 rotates with respect to the plate member 257 about the hinge portion. Specifically, the plate member 258 can approach and separate from the plate member (corresponding to the third plate member) 257. That is, the plate member 258 can be opened and closed with respect to the plate member 257. A state indicated by a dotted line in FIG. 8 represents an open state of the plate member 258. As shown in FIG. 8, the plate member 258 is opened by rotating in a direction away from the main body 1a (corresponding to the second direction).

(B-2) One-way roller A plurality of one-way rollers 259 are provided along the longitudinal direction (film width direction) of the plate member 258. The surface of the one-way roller 259 protrudes closer to the plate member 257 than the surface of the plate member 258 (see FIG. 10).

(2-4-3) Loading unit drive motor The loading unit drive motor 54 rotates the loading unit rotating shaft 70a described above. The loading unit drive motor 54 rotates the loading unit rotation shaft 70a according to the setting input to the control device 9 described later. Here, the setting input to the control device 9 is a setting relating to which film roll R1 or film roll R2 is used. If the setting input to the control device 9 is to select the film roll R1, the loading unit drive motor 54 loads the first gripping unit 71 so that the tip of the first gripping unit 71 is closest to the film transport mechanism 6. The unit rotation shaft 70a is rotated. Specifically, the loading unit drive motor 54 rotates the loading unit rotation shaft 70a so that the inclination of the first gripping unit 71 with respect to the film transport mechanism 6 described later is horizontal (see FIGS. 9B and 20B). On the other hand, when the setting input to the control device 9 is to select the film roll R2, the loading unit drive motor 54 makes the tip of the second gripping unit 72 closest to the film transport mechanism 6. Then, the loading unit rotating shaft 70a is rotated. Specifically, the loading unit drive motor 54 rotates the loading unit rotation shaft 70a so that the inclination of the second gripping unit 72 with respect to the film transport mechanism 6 described later is horizontal (see FIGS. 9C and 21B). Further, in the control device 9 to be described later, when the film set button is pressed or when the sensor detects that the film rolls R1 and R2 are lost, the loading unit drive motor 54 has the first gripping unit 71. The loading unit rotating shaft 70a is rotated so that the leading end of the second gripping unit 72 and the leading end of the second gripping unit 72 are away from the film transport mechanism 6. Specifically, the loading unit drive motor 54 rotates the loading unit rotation shaft 70a so that the first gripping unit 71 and the second gripping unit 72 are positioned symmetrically with respect to the reference line L (FIG. 9A). And FIG. 10 etc.).

(2-5) Film Transport Mechanism The film transport mechanism 6 receives a film from the film delivery mechanism 5 and transports the films F1 and F2 to the packaging station 3. Further, the film transport mechanism 6 holds the films F <b> 1 and F <b> 2 received from the film delivery mechanism 5 in tension at the central portion of the packaging station 3.

  As shown in FIG. 8, the film transport mechanism 6 mainly includes a first feeder unit 61, a second feeder unit 62, a first feeder moving unit 63, a second feeder moving unit 64, and a feeder driving unit 65. It is composed of

  The first feeder unit 61 is disposed on the front side when viewed from the front of the stretch wrapping apparatus 1. Further, the second feeder unit 62 is disposed on the other side as viewed from the front of the stretch wrapping apparatus 1. Moreover, the 1st feeder unit 61 and the 2nd feeder unit 62 are arrange | positioned at the width direction both sides of the film along the longitudinal direction of a film. The 1st feeder unit 61 and the 2nd feeder unit 62 pinch | interpose the width direction both sides (front side and side part on the other side) of a film with a belt. The first feeder unit 61 and the second feeder unit 62 are driven by a feeder driving unit 65 and transport the films F1 and F2.

  In addition, slide shafts 66 and 67 extending in the width direction of the film are provided on the side portions in the longitudinal direction of the first feeder unit 61 and the second feeder unit 62, as shown in FIGS. The first feeder unit 61 and the second feeder unit 62 are supported by slide shafts 66 and 67. The first feeder unit 61 and the second feeder unit 62 are driven by the first feeder moving unit 63 and the second feeder moving unit 64, and move in the film width direction along the slide shafts 66 and 67.

(2-5-1) First Feeder Unit and Second Feeder Unit The configuration of the first feeder unit 61 and the configuration of the second feeder unit 62 are substantially the same. Therefore, the configuration of the first feeder unit 61 will be described below with reference to FIGS. 12 and 13A to 13C.

  The first feeder unit 61 mainly includes an introduction unit 22, a lower belt 23, an upper belt 24, an upstream region clamp 25, a midstream region clamp 26, a downstream region clamp 27, and a frame 21 that supports these configurations. Including.

(A) Introduction Unit The introduction unit 22 introduces the films F1 and F2 between the lower belt 23 and the upper belt 24. The introduction unit 22 is arranged on the upstream side of the first feeder unit 61, that is, in the vicinity of the loading unit 70 (see FIG. 12). In addition, as shown in FIG. 12, the introduction unit 22 is arranged at a position overlapping the lower belt 23 on a plane.

  The introduction unit 22 has a first end and a second end that is the end opposite to the first end (see FIGS. 12, 13A, and 13B). The first end is disposed in the vicinity of the film delivery mechanism 5. An introduction pulley 22a is attached to the first end. The introduction pulley 22 a is driven by the rotation of the pulley 21 b of the lower belt 23. As shown in FIGS. 12 and 13B, the upper belt 24 is hung on the introduction pulley 22a. The upper belt 24 is driven by the rotation of the introduction pulley 22a.

  The second end portion has an introduction unit rotation shaft 22b. The introduction unit rotation shaft 22b is driven by a solenoid (not shown). The introduction unit 22 opens and closes the first end with the introduction unit rotation shaft 22b as a fulcrum. Specifically, the first end portion moves back and forth between an upper position away from the lower belt 23 and a lower position close to the lower belt 23 at a predetermined timing. Here, the predetermined timing is a timing at which the films F1 and F2 are delivered by the loading unit 70. That is, when the films F1 and F2 are delivered by the loading unit 70, the introduction unit 22 moves the first end portion to the lower position around the introduction unit rotation shaft 22b. Accordingly, the films F1 and F2 are sandwiched between the upper belt 24 and the lower belt 23.

  The introduction unit 22 keeps the first end in the lower position for a first predetermined time. During the first predetermined time, the films F1 and F2 continue to be held between the upper belt 24 and the lower belt 23. Here, the first predetermined time is the time from the timing at which the loading unit 70 delivers the films F1, F2 to the timing at which the films F1, F2 are cut by the cutter mechanism 7.

  In addition, the introduction unit 22 moves the first end portion to the lower position in accordance with the timing when the clamp described later clamps the films F1 and F2.

(B) Lower belt The lower belt 23 contacts the film F1 from below. The lower belt 23 is stretched around a plurality of pulleys as shown in FIG. 13B. The plurality of pulleys include a pulley 21b and a pulley 21c. The pulley 21b is disposed on the upstream side in the film transport direction. The pulley 21c is disposed on the downstream side in the film transport direction. The pulley 21c is connected to the drive motor. The pulley 21b follows the movement of the pulley 21c. The drive motor drives the pulley 21c in synchronization with the roll drive unit 43 described above. The lower belt 23 of the first feeder unit 61 and the second feeder unit 62 operates by driving the pulley 21c by the drive motor.

(C) Upper belt The upper belt 24 rides on the lower belt 23. The upper belt 24 follows the movement of the lower belt 23. The upper belt 24 is also stretched around a plurality of pulleys as shown in FIG. 13B. The plurality of pulleys include the introduction pulley 22a of the introduction unit 22 described above. The films F1 and F2 are conveyed downstream while being wound between the upper belt 24 and the lower belt 23.

(D) Clamp The clamp includes an upstream region clamp 25, a midstream region clamp 26, and a downstream region clamp 27. As shown in FIG. 13C, the upstream area clamp 25 is disposed on the upstream side in the film conveyance direction, the downstream area clamp 27 is disposed on the downstream side in the film conveyance direction, and the midstream area clamp 26 includes the upstream area clamp 25 and It is arranged between the downstream area clamps 27. The clamps 25 to 27 are arranged at positions shifted from the belts 23 and 24 on the plane. Specifically, the clamps 25 to 27 are arranged inside the belts 23 and 24 with respect to the width direction of the film. Below the clamps 25 to 27, a band plate 21a is arranged.

  The clamps 25 to 27 are operated by switching on / off a solenoid (not shown). Specifically, the clamps 25 to 27 apply force to the films F1 and F2 or release the films F1 and F2 by switching the solenoid on / off. More specifically, when the solenoid is on, the clamps 25 to 27 contact the upper surfaces of the films F1 and F2 and apply a downward force. Thereby, film F1, F2 is clamped between the clamps 25-27 and the strip 21a. On the other hand, if the solenoid is turned off, the tension holding of the films F1 and F2 is released. The solenoid is switched ON at the timing when the film conveyance is completed.

(2-5-2) First Feeder Moving Unit and Second Feeder Moving Unit The first feeder moving unit 63 is attached below the first feeder unit 61. As shown in FIG. 3, the first feeder moving unit 63 includes a drive motor 63a and a belt 63b. The belt 63b is moved in both directions of the film width by the drive motor 63a.

  Further, the second feeder moving unit 64 is attached below the second feeder unit 62. As shown in FIG. 3, the second feeder moving unit 64 includes a drive motor 64a and a belt 64b. The belt 64b is moved in the film width direction by the drive motor 64a.

  As the belt 63b moves in the film width direction, the first feeder unit 61 also moves in the film width direction. Similarly, when the belt 64b moves in the film width direction, the second feeder unit 62 also moves in the film width direction.

(2-6) Cutter Mechanism The cutter mechanism 7 cuts the film F stretched between the film delivery mechanism 5 and the film conveyance mechanism 6 after the film delivery mechanism 5 delivers the film to the film conveyance mechanism 6. Specifically, after the film transport mechanism 6 transports a predetermined amount of film, the cutter mechanism 7 cuts the film F stretched between the film delivery mechanism 5 and the film transport mechanism 6.

  The cutter mechanism 7 is disposed between the film delivery mechanism 5 and the film transport mechanism 6 as shown in FIGS. Moreover, the cutter mechanism 7 has the cutting blade 7a (refer FIG. 2 etc.). The cutting blade 7a is longer than the film width. The cutting blade 7a is moved up and down by an actuator.

(2-7) Seal mechanism, label printer, label issuing machine The seal mechanism 8 heat seals the films F1 and F2 folded to the bottom surface side of the package by the folding mechanism 37. The sealing mechanism 8 also has a function of discharging the packaged tray T and the article G (product).

  The label printer 10 prints information on articles on a label. Here, the information on the article includes a product name and a price.

  The label issuing machine 11 attaches the label printed by the label printer 10 to the discharged packaged product.

(2-8) Control Device The control device 9 is a computer arranged at the upper part of the main body 1a. The computer includes a display panel 9a, operation keys 9b, a storage unit 9c, and the like. The control device 9 controls the operation of each mechanism described above (see FIG. 14).

  Further, the control device 9 calculates the price of the article G based on the signal indicating the weight of the article G measured by the weighing-in mechanism 2. Furthermore, the control device 9 controls the operation of the label printer 10 and the label issuing machine 11 that print the weight, price, etc. of the article G on the label.

  The display panel 9a is a touch panel display. Operation buttons are also displayed on the display. The storage unit 9c stores various data input from the display panel 9a, the operation keys 9b, or the like or transferred from an external device. The various data includes data about the films F1 and F2, information about the article G to be packaged, and the like.

  The operation by the operator is accepted not only by the operation button and operation key 9b in the display panel 9a but also by each switch and dials 15, 16, 17, 18, 19 (see FIG. 14). The operation buttons include a film set button 15. The film set button 15 is used when the film rolls R1 and R2 are exchanged. Specifically, the film set button 15 is a button for switching the loading unit 70 of the film delivery mechanism 5 to the loading position. The operations accepted by the operator include the type and number of articles G to be packaged, the speed at which the articles G are packaged, and the selection of film rolls R1 and R2.

  A lid opening / closing sensor 14 is connected to the control device 9. The lid opening / closing sensor 14 is a proximity switch that monitors the opening / closing of the lid 1d of the casing 1b. When the lid opening / closing sensor 14 is opened or closed, the control device 9 receives the detection result of the state change from the lid opening / closing sensor 14. When receiving the detection result from the lid opening / closing sensor 14, the control device 9 changes the loading unit 70 to a posture suitable for the selected film rolls R1 and R2.

  Various control lines and boards connected to the control device 9 are housed in an electrical component box 13 in the casing 1b (see FIG. 2). As described above, the roll holding mechanism 4 is installed in the casing 1b. Heat generated from the substrate stored in the electrical component box 13 is used to warm the inside of the casing 1b.

(3) Operation | movement of stretch packaging apparatus (3-1) Operation | movement outline | summary Next, operation | movement of the stretch packaging apparatus 1 which concerns on this embodiment is demonstrated easily. In the stretch wrapping apparatus 1, when the tray T containing the articles G is placed on the weighing instrument of the weighing-in mechanism 2 by the operator (see FIG. 15), it waits for the weighing value to stabilize and the weighing to be completed. The carry-in belt 2b starts to move. The protrusion fixed to the carry-in belt 2b moves according to the movement of the carry-in belt 2b, and pushes out the tray T on which the article G is placed onto the support member 33 of the lifter mechanism 30 (see FIG. 15).

  On the other hand, the films F1 and F2 transferred to the film transport mechanism 6 by the film delivery mechanism 5 are cut by the cutter mechanism 7 into one rectangular film F1 and F2. When the films F1 and F2 are carried to the upper part of the lifter mechanism 30 by both feeder units 61 and 62, both sides in the width direction of the films F1 and F2 are held in tension by the operation of the clamps 25 to 27 (see FIG. 16).

  The lifter mechanism 30 pushes up the article G and the tray T against the film F held in tension (see FIG. 17). As a result, the films F1 and F2 that are tension-held on the side in the width direction of the films F1 and F2 extend so as to cover the article G and the tray T.

  The folding mechanism 37 starts operating with the films F1 and F2 covering the article G and the tray T. Specifically, the rear folding plate 78 and the left and right folding plates 76 and 77 move horizontally to the bottom surface side of the tray T. Further, at an appropriate timing, the clamps 25 to 27 other than the clamp 26 on the front side (left side in FIG. 17) release the holding of the films F1 and F2. After releasing the holding of the films F1 and F2 by the clamps 25 to 27, the three sides around the films F1 and F2 are folded to the lower side of the tray T.

  Thereafter, when the discharge pusher 79a pushes the tray T toward the seal mechanism 8, one side of the front-side films F1 and F2 that have not been folded comes into contact with the front folding bar 79. The films F1 and F2 that have come into contact with the front folding bar 79 are folded under the tray T as the tray T moves toward the seal mechanism 8 side. At this time, the front-side clamp 26 releases the holding of the films F1 and F2. The film F folded under the tray T is heat-sealed and then discharged (see FIG. 18).

  If processing including labeling is selected, the price and weight of the product calculated based on the measured value are printed on the label by the label printer 10, and then the label is printed on the film by the label issuing machine 11. Affixed to F1 and F2.

(3-2) Operation in Film Delivery Mechanism Next, the operation in the film delivery mechanism 5 will be described with reference to FIG.

  First, in step S1, it is determined whether or not the film set button has been pressed by the operator. If the film set button has been pressed, the process proceeds to step S2.

  In step S2, the loading unit drive motor 54 rotates the loading unit rotating shaft 70a to switch the loading unit 70 to the third posture (loading position). That is, the loading unit rotating shaft 70a is rotated so that the first gripping unit 71 and the second gripping unit 72 are positioned at positions symmetrical with respect to the reference line L (see FIG. 9A).

  Next, in step S <b> 3, whether or not the lid 1 d of the casing 1 b is closed is determined based on the detection result transmitted from the lid opening / closing sensor 14. In step S3, the process waits until it is determined that the lid 1d is closed. When the lid 1d is closed, the process proceeds to step S4.

  In step S4, it is determined which film F1, F2 is selected. If it is determined in step S4 that one film F1 has been selected, the process proceeds to step S5. On the other hand, if it is determined that the film F2 has been determined, the process proceeds to step S6.

  In step S5, the loading unit drive motor 54 rotates the loading unit rotating shaft 70a to switch the loading unit 70 to the first posture (first feeding position). That is, the loading unit rotating shaft 70a is rotated so that the first gripping unit 71 is horizontal (see FIG. 9B).

  On the other hand, in step S6, the loading unit drive motor 54 rotates the loading unit rotating shaft 70a to switch the loading unit 70 to the second posture (second feeding position). That is, the loading unit rotating shaft 70a is rotated so that the second gripping unit 72 is horizontal (see FIG. 9C).

(3-3) Film Delivery Process Next, the flow of the process (film delivery process) in which the films F1 and F2 are sent from the film delivery mechanism 5 to the film transport mechanism 6 will be described with reference to FIGS. 20A to 21D. 20A to 20D show film delivery processing when the film F1 is selected. 21A to 21D show film delivery processing when the film F2 is selected.

  When the film F1 is used, the stretch wrapping apparatus 1 tilts the loading unit 70 in the direction indicated by the arrow A2 in FIG. 20A to make the first gripping unit 71 horizontal. Thereafter, the stretch wrapping apparatus 1 brings the loading unit moving frame 51 closer to the film transport mechanism 6 as indicated by an arrow A3 in FIG. 20B. Thereafter, the stretch wrapping apparatus 1 moves the introduction unit 22 to the lower position and sandwiches the film F1 with the lower belt 23 as indicated by an arrow A4 in FIG. 20C. The stretch wrapping apparatus 1 moves the loading unit moving frame 51 in the direction indicated by the arrow A5. Thereafter, the stretch wrapping apparatus 1 introduces a predetermined amount of film F <b> 1 between the lower belt 23 and the upper belt 24. When a predetermined amount of film F1 is introduced between the lower belt 23 and the upper belt 24, the cutter mechanism 7 is operated as shown by an arrow A6 in FIG. 20D, and the film feed mechanism 5 and the film transport mechanism 6 The film F1 stretched between them is cut.

  When the film F2 is used, the stretch wrapping apparatus 1 tilts the loading unit 70 in the direction indicated by the arrow A2 in FIG. 21A to make the second gripping unit 72 horizontal. Thereafter, the stretch wrapping apparatus 1 brings the loading unit moving frame 51 closer to the film transport mechanism 6 as indicated by an arrow A3 in FIG. 21B. Thereafter, the stretch wrapping apparatus 1 moves the introduction unit 22 to the lower position and sandwiches the film F1 with the lower belt 23, as indicated by an arrow A4 in FIG. 21C. The stretch wrapping apparatus 1 moves the loading unit moving frame 51 in the direction indicated by the arrow A5. Thereafter, the stretch wrapping apparatus 1 introduces a predetermined amount of film F <b> 1 between the lower belt 23 and the upper belt 24. When a predetermined amount of film F1 is introduced between the lower belt 23 and the upper belt 24, the cutter mechanism 7 is operated as shown by an arrow A6 in FIG. 21D, and the film feed mechanism 5 and the film transport mechanism 6 The film F1 stretched between them is cut.

(4) Features (4-1)
In order to save space, the stretch wrapping apparatus 1 according to the present embodiment has one casing 1b on one side of the main body 1a, and the casing 1b can be loaded with a plurality of film rolls R1 and R2. Yes. Moreover, the stretch wrapping apparatus 1 has a film delivery mechanism 5 so that the films F1 and F2 fed out from each of the plurality of film rolls R1 and R2 can be delivered to the film transport mechanism 6. In the film delivery mechanism 5, the posture of the loading unit 70 is switched according to the films F1 and F2 to be used. Furthermore, the stretch wrapping apparatus 1 has a loading position (third posture) so that the film rolls R1 and R2 can be easily loaded.

  Thereby, even if it is a case where several film roll R1, R2 is arrange | positioned in space saving, the operativity of film roll loading can be improved.

(4-2)
In the stretch wrapping apparatus 1 according to the above embodiment, the first holding unit 71 that holds the film F1 and the second holding unit 72 that holds the film F2 are supported by the loading unit rotating shaft 70a. Further, the posture of the loading unit 70 is switched by rotating the loading unit rotating shaft 70a.

  Thereby, the film to be used can be switched in a space-saving manner.

(4-3)
Furthermore, in the stretch wrapping apparatus 1 according to the above-described embodiment, both the first gripping unit 71 and the second gripping unit 72 are moved to a position away from the film transport mechanism 6 by switching to the loading position. Therefore, the loading unit 70 can be easily performed when either the film F1 or the film F2 is gripped.

(4-4)
Moreover, in the stretch packaging apparatus 1 which concerns on the said embodiment, the 1st holding | grip unit 71 is arrange | positioned in the position close | similar to the main body 1a, and the 2nd holding | grip unit 72 is arrange | positioned in the position away from the main body 1a. Further, the loading unit 70 is set to the first posture when the film F1 is fed to the film transport mechanism 6 so that the plurality of films F1 and F2 can be used, and the loading unit 70 is loaded when the film F2 is fed to the film transport mechanism 6. The unit 70 is switched to the second posture.

  Here, when the film F2 runs out while the film F2 is being used, the loading unit 70 takes the second posture. In order to cause the second gripping unit 72 to grip the film F2, the plate member 258 is rotated vertically upward with respect to the plate member 257, and the film F2 is gripped between the plate member 258 and the plate member 257. If the lid 1c of the casing 1b is opened, there is a wide space above the second gripping unit 72. Therefore, it is easy for the second gripping unit 72 to grip the film F2. However, when the film F1 runs out while using the film F1, the loading unit 70 takes the first posture. Therefore, when the first gripping unit 71 tries to grip the film F1, the plate member 158 is rotated downward in the vertical direction with respect to the plate member 157. At this time, the operator must work in a low posture, and the work is complicated.

  The stretch wrapping apparatus 1 according to the above embodiment is configured such that the plate member 158 and the plate member 258 can be rotated in the left-right direction when the loading unit 70 is in the loading position. Thereby, it is not necessary to force an unreasonable posture to the operator. In addition, a space required for causing the loading unit 70 to grip the films F1 and F2 can be reduced.

(4-5)
The stretch wrapping apparatus 1 according to the above embodiment arranges the electrical component box 13 inside the casing 1b and warms the film rolls R1 and R2 using heat generated from the substrate housed inside the electrical component box 13. Yes. Generally, the stretch wrapping apparatus 1 is disposed in a backyard such as a supermarket. That is, the stretch wrapping apparatus 1 is often arranged at a place where an inventory of articles is stored or where an article is processed. The backyard temperature is not well controlled compared to the sales floor temperature. Therefore, depending on the backyard temperature, the films F1 and F2 may not be properly fed out from the film rolls R1 and R2 loaded in the stretch wrapping apparatus 1. Conventionally, a fan heater has been used to warm the temperature in the casing 1b.

  However, in the stretch wrapping apparatus according to the above embodiment, the electrical component box 13 is disposed inside the casing 1b, and the heat generated by the substrate is used for temperature adjustment in the casing 1b. That is, the temperature of the space in which the film rolls R1 and R2 are installed is adjusted using waste heat. Thus, the films F1 and F2 can be reliably fed out. Further, the installation of the fan heater can be omitted or the operation time of the fan heater can be reduced.

(5) Modification (5-1)
The stretch wrapping apparatus 1 according to the above embodiment arranges the electrical component box 13 inside the casing 1b, and adjusts the temperature inside the casing 1b using the heat generated by the electrical component box 13. Here, a heat sink may be used to adjust the temperature.

(5-2)
Although the stretch wrapping apparatus 1 according to the above embodiment packages the article G placed on the tray T, the stretch wrapping apparatus 1 may be used when only the article G is packaged.

DESCRIPTION OF SYMBOLS 1 Stretch packaging apparatus 1a Main body 1b Casing 1c, 1d Lid 2 Weigh-in mechanism 3 Packaging station (packaging part)
4 Roll holding mechanism 5 Film delivery mechanism (film delivery mechanism)
6 Film transport mechanism (transport mechanism)
7 Cutter mechanism 8 Seal mechanism (packaging part)
9 Controller 51 Loading unit moving frame 52 Loading unit drive motor (switching unit)
70 Loading unit 71 First gripping unit (first film gripping portion)
72 Second gripping unit (second film gripping portion)
73 Loading unit rotating shaft (support shaft)
F1, F2 film (first film, second film)
R1, R2 film roll

JP 2003-95208 A

Claims (5)

A wrapping portion for holding the first film or the second film in tension and pressing it relatively against the article, and packaging the article with the first film or the second film;
A transport mechanism for transporting the first film or the second film to the packaging unit;
A film delivery mechanism that selectively delivers either the first film or the second film to the transport mechanism;
With
The film delivery mechanism is
A first film gripping part for gripping the first film;
A second film gripping part for gripping the second film;
A first posture in which the first film gripping portion delivers the first film to the transport mechanism, and a second posture in which the second film gripping portion delivers the second film to the transport mechanism. When, viewed contains a switching unit for switching the third posture is a posture capable of gripping the first film to the first film holding portion,
The film delivery mechanism further includes a support shaft that supports the first film gripping part and the second film gripping part,
The switching unit switches to any one of the first posture, the second posture, and the third posture by changing a rotation angle of the support shaft .
Stretch packaging device. The third posture is a posture in which the second film can be gripped by the second film gripping portion.
The stretch wrapping apparatus according to claim 1. In the first posture, the distance from the tip of the first film gripping part to the transport mechanism is closer than the distance from the second film gripping part to the transport mechanism,
In the second posture, the distance from the tip of the second film gripping part to the transport mechanism is closer than the distance from the first film gripping part to the transport mechanism,
The third posture is a distance from the leading end of the first film gripping portion to the transport mechanism and a distance from the leading end of the second film gripping portion to the transport mechanism than the first posture and the second posture. Is far from
The stretch wrapping apparatus according to claim 1 or 2 . The first film gripping part is
A first plate member;
A second plate member capable of approaching and separating from the first plate member,
The second film gripping part is
A third plate member;
A fourth plate member capable of approaching and moving away from the third plate member,
The first film is gripped between the first plate member and the second plate member,
The second film is gripped between the third plate member and the fourth plate member.
The stretch wrapping apparatus according to any one of claims 1 to 3 . The support shaft supports the first plate member and the third plate member at close positions,
The second plate member moves in the first direction to approach the first plate member, and the fourth plate member moves in the second direction, which is the opposite direction of the first direction. Approaching the third plate member;
The stretch wrapping apparatus according to any one of claims 1 to 4 .

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