JP5576686B2 - Packaging machine - Google Patents

Description

  The present invention relates to a packaging machine for packaging an object to be packaged using a film.

  Conventionally, various techniques have been proposed for a packaging machine that wraps an article to be packaged using a film. For example, in the packaging machines described in Patent Documents 1 and 2, a film is supplied from a film roll in which the film is wound in a roll shape to a packaging area where packaging is performed. Next, the film supplied to the packaging area is cut from the film roll. And after a to-be-packaged object is pushed up with respect to the film extended in the packaging area, the peripheral part of the said film is folded in the lower side of the said to-be-packaged object, and the said to-be-packaged object is packaged.

JP 11-222203 A JP 2007-30898 A

  In the packaging machine described in the above-mentioned Patent Documents 1 and 2, in order to be able to deal with various sizes of packages, for example, a film having a length that can appropriately package the largest package is used. It is possible to always use it. However, in such a case, waste of film occurs.

  On the other hand, by registering the appropriate film length for each packaged item in the packaging machine, when the user packages the packaged item, the user selects the appropriate film length for the packaged item. Thus, it becomes possible to appropriately package objects to be packaged of various sizes. However, in this case, a user's selection mistake may occur, and the length of the film may be insufficient.

  Therefore, the present invention has been made in view of the above points, and provides a technique capable of automatically obtaining a film having an appropriate length in a packaging machine for packaging using a film. Objective.

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that after the object to be packaged is pushed up with respect to the spread film and the object to be packaged is covered with the film, the peripheral edge of the film is removed from the object to be packaged. A wrapping machine that folds down and wraps the article to be packaged, from a film roll to a packaging area in which the article to be packaged is a natural product such as vegetables or fruits that is not mounted on a tray. In a state in which the film can be fed from the film roll with respect to the film supply unit and the packaging area for supplying the film, the packaged object is lifted and the packaged object is moved with respect to the film in the packaging area. In the state where the lift part to be pushed up and the lift part push up the article to be packaged with respect to the film in the packaging area, the film roll A cutting unit for al cutting, the a first grip the film to grip the ends of the packaging film is a film which has been cut from the roll along said direction perpendicular to the direction in which the packaged articles can be pushed up by the lift portion A first motor that moves the first gripping part, a folding member that folds the end of the packaging film below the packaged object, and an output torque that moves the folding member along the vertical direction. (A) the packaged film in the packaging film in a state where the packaged object is pushed up by the lift unit and the end is gripped by the first gripping unit. An output torque of the second motor reaches a predetermined limit value by moving in the vertical direction while the folding member abuts against an inclined portion between an object and the first gripping portion; A step of stopping the movement of the folding member, and (b) after the step (a), the first gripping portion moves by a predetermined distance in the vertical direction, and the output torque of the second motor decreases, The step of resuming the movement of the folding member in the vertical direction is repeatedly performed, whereby the end portion of the packaging film is folded to the lower side of the packaged object, and the first gripping portion is When the distance between the folding member in the vertical direction is equal to or less than a predetermined value, the gripping of the packaging film is released .

Moreover, invention of Claim 2 is the packaging machine of Claim 1, Comprising: The position which mutually separated the film drawn | fed out from the said film roll to the said packaging area between the said film roll and the said packaging area. in Bei example the second and third gripping unit for gripping, the cutting unit, a film in a state of being gripped by the second and third gripping unit is cut between the second and third gripping unit.

  According to the first and second aspects of the present invention, the packaged object is pushed up against the film in the packaging area in a state where the film can be fed out from the film roll to the packaging area. The film is fed out to the packaging area by an amount corresponding to the size of. Therefore, a film having an appropriate length can be automatically obtained by cutting the film from the film roll in a state where the object to be packaged is pushed up with respect to the film in the packaging area.

  In particular, according to the invention of claim 2, since the film fed to the packaging area is cut between the first and second gripping portions in the state of being gripped by the first and second gripping portions, The film can be easily cut.

It is a perspective view which shows the external appearance of the weighing packaging price attaching machine which concerns on embodiment of this invention. It is a side view which shows the structure of the measurement conveyance mechanism and packaging machine which concern on embodiment of this invention. It is a block diagram which shows the structure of the packaging machine which concerns on embodiment of this invention. It is a top view which shows the film holding | grip mechanism which concerns on embodiment of this invention. It is a front view which shows the front side holding part which concerns on embodiment of this invention. It is a side view which shows the front side grip part and back side grip part which concern on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a perspective view which shows the structure of the film folding mechanism which concerns on embodiment of this invention. It is a figure which shows operation | movement of the left side folding member and right side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the left side folding member and right side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the left side folding member and right side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the left side folding member and right side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the rear side folding member and front side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the rear side folding member and front side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the rear side folding member and front side folding member which concern on embodiment of this invention. It is a figure which shows operation | movement of the rear side folding member and front side folding member which concern on embodiment of this invention. It is a figure which shows an example of the goods master file which concerns on embodiment of this invention. It is a figure which shows an example of the tray master file which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a figure which shows operation | movement of the packaging machine which concerns on embodiment of this invention. It is a side view which shows a part of structure of the measurement conveyance mechanism which concerns on the modification 1, and a packaging machine. It is a top view which shows a part of structure of the measurement conveyance mechanism which concerns on the modification 1, and a packaging machine. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows operation | movement of the packaging machine which concerns on the modification 2. It is a figure which shows the goods master file which concerns on the modification 3. It is a figure which shows an example of the tray list screen which concerns on the modification 4. It is a figure which shows an example of the production screen which concerns on the modification 4. It is a figure which shows an example of the production screen which concerns on the modification 4. It is a figure which shows an example of the production screen which concerns on the modification 4. It is a figure which shows an example of the tray registration screen which concerns on the modification 4. It is a figure which shows an example of the packaging condition list screen which concerns on the modification 4. It is a figure which shows an example of the tray list screen which concerns on the modification 4. It is a figure for demonstrating the modification 5. FIG. It is a figure for demonstrating the modification 5. FIG. It is a figure for demonstrating the modification 6. FIG. It is a figure for demonstrating the modification 6. FIG. It is a figure for demonstrating the modification 6. FIG. It is a figure for demonstrating the modification 6. FIG. It is a figure for demonstrating the modification 6. FIG. It is a figure which shows the conveyor which concerns on the modification 8.

  FIG. 1 is a perspective view showing an external appearance of a weighing and packaging price adding machine 1 including a packaging machine 3 according to an embodiment of the present invention. The weighing and packaging pricing machine 1 according to the present embodiment measures and packages products such as vegetables and fruits, and then discharges the packaged products and discharges the label on which the price of the product is printed. To do. In the weighing and packaging price adding machine 1, for example, a product mounted on a tray can be packaged together with the tray. In addition, the weighing and packaging price adding machine 1 can package products as they are without being mounted on a tray. Here, regarding the product mounted on the tray, both the tray and the product (contents) mounted on the tray are collectively referred to as “product”. In the following description, an XYZ orthogonal coordinate system (see FIG. 1) in which the front-rear direction, the left-right direction, and the up-down direction of the weighing packaging value-adding machine 1 are X direction, Y direction, and Z direction, respectively, is used as appropriate.

  As shown in FIG. 1, the weighing and packaging price setting machine 1 includes a weighing and conveying mechanism 2, a packaging machine 3, a label issuing device 4, a display unit 5, an operation unit 6, a storage unit 8, and these And a control unit 9 for controlling the components.

  The control unit 9 is housed in the housing 10 and includes a CPU or the like. The storage unit 8 is housed in the housing 10 and includes a hard disk or the like. The storage unit 8 stores various information such as operation programs. Various functions of the control unit 9 are realized by the CPU of the control unit 9 executing the operation program in the storage unit 8.

  The display unit 5 is a touch panel display, for example, and also functions as an operation unit. The operation unit 6 is constituted by a plurality of operation keys, for example. Operation information input from the user to the display unit 5 and the operation unit 6 is input to the control unit 9. The control unit 9 performs an operation according to the input operation information. Hereinafter, the display unit 5 and the operation unit 6 may be collectively referred to as an “operation unit 7”.

  The weighing and conveying mechanism 2 measures the product while conveying the product put in by the user toward the packaging machine 3. The result of measurement by the measurement transport mechanism 2 is input to the control unit 9. The control unit 9 controls the display unit 5 to display the input measurement result on the display unit 5.

  The packaging machine 3 uses the lift unit 30 to lift the product conveyed from the weighing and conveying mechanism 2 to the packaging area PA. At this time, in the packaging machine 3, the stretch film SF is supplied to the packaging area PA. The packaging machine 3 is provided with a film storage unit 31 for storing a film roll FR in which the stretch film SF is wound in a roll shape, and the stretch film SF is supplied from the film roll FR to the packaging area PA. . The packaging machine 3 lifts the product by the lift unit 30 to push up the product with respect to the stretch film SF disposed in the packaging area PA, and covers the product with the stretch film SF. Thereafter, the packaging machine 3 folds the peripheral edge of the stretch film SF under the product covered with the stretch film SF. Thereby, goods are packaged. The packaging machine 3 discharges the packaged product toward the discharge table 45.

  The label issuing device 4 issues a label L toward the outside when the packaging machine 3 discharges the packaged product toward the discharge table 45. On this label L, the weight and price of the product are printed. The control unit 9 obtains these weights and prices based on the measurement results obtained by the measurement transport mechanism 2.

<Configuration of weighing and conveying mechanism>
FIG. 2 is a side view showing the configuration of the weighing and conveying mechanism 2 and the packaging machine 3 in the weighing and packaging price attaching machine 1. In addition, in FIG. 2, a mode that the goods P move is shown with the dashed-two dotted line. The weighing transport mechanism 2 includes a weight sensor 20, a placement unit 21 on which the product P to be processed is mounted, a transport unit 22 that transports the product P mounted on the placement unit 21 to the lift unit 30, and a placement And a support portion 23 that supports the portion 21. The weight sensor 20 detects the weight of the product P placed on the placement unit 21 and outputs the detection result to the control unit 9. The mounting portion 21 has a plurality of mounting portions 21a on which the product P is mounted, which are arranged apart from each other along the X direction. Each mounting portion 21a extends along the Y direction.

  The conveyance part 22 has the some support part 22a which supports the goods P arranged mutually apart along the X direction. Each support portion 22a extends along the Y direction. The plurality of support portions 22a and the plurality of mounting portions 21a of the placement portion 21 are alternately arranged along the X direction. The transport unit 22 moves in the Z direction and the Y direction by being driven by a driving unit (not shown) controlled by the control unit 9.

  When the product P is placed on the plurality of mounting portions 21 a of the mounting portion 21, the transport unit 22 is configured such that the upper end of each support portion 22 a is above (+ Z side) the upper end of each mounting portion 21 a. 2 moves in the + Z direction from the position shown in FIG. Accordingly, the transport unit 22 scoops up the product P on the placement unit 21 from the lower side, and as a result, the product P is supported by the transport unit 22. Then, the transport unit 22 moves in the −Y direction and stops when the product P is positioned above the lift unit 30. The lift unit 30 includes a plurality of lift heads 300 arranged in the X direction and a support unit 301 that supports the plurality of lift heads 300. The transport unit 22 moves so that the plurality of support portions 22 a enter between the plurality of lift heads 300. The product P on the transport unit 22 is picked up by the lift unit 30 moving in the + Z direction and lifted up to the packaging area PA. Thereafter, the transport unit 22 moves in the -Z direction and then moves in the + Y direction, and returns to the position shown in FIG.

<Configuration of packaging machine>
FIG. 3 is a block diagram showing the configuration of the packaging machine 3. As shown in FIGS. 1 to 3, the packaging machine 3 includes a lift unit 30, a film storage unit 31, a film supply unit 32, a film cutting unit 33, a front gripping unit 34, and a rear gripping unit 35. The left side grip part 36 and the right side grip part 37 are provided. Further, the packaging machine 3 includes a left folding member 38, a right folding member 39, a rear folding member 40, a front folding member 41, a discharge pusher 42, a heater unit 43, a transport roller 44, and a discharge table 45. It has. In FIG. 2, illustration of the left side gripping part 36, the right side gripping part 37, and the right side folding member 39 is omitted in order to avoid complexity of the drawing.

  In the packaging machine 3, the film supply unit 32 supplies the stretch film SF from the film roll FR stored in the film storage unit 31 to the packaging area PA. The lift unit 30 lifts the product P on the transport unit 22 in the + Z direction and pushes up the product P against the stretch film SF in the packaging area PA. Thereby, the product P is covered with the stretch film SF. Thereafter, the stretch film SF in the packaging area PA is cut from the film roll FR by the film cutting unit 33. Thereby, the stretch film SF is cut into a predetermined length.

  In the stretch film SF of the cut packaging area PA, the + Y side end and the −Y side end are gripped by the front gripping part 34 and the rear gripping part 35, respectively, and the −X side end and the + X side end are on the left side. It is gripped by the gripping portion 36 and the right gripping portion 37, respectively. The −X side end and + X side end of the stretch film SF are folded below the product P by the left folding member 38 and the right folding member 39, respectively, and the −Y side end of the stretch film SF is folded back. The member 40 is folded under the product P. Thereafter, the product P is pushed by the discharge pusher 42 toward the discharge table 45 (in the + X direction). At this time, the + Y side end of the stretch film SF is folded below the product P by the front folding member 41. Thereby, all the peripheral parts of the stretch film SF are folded under the product P. Further, when the product P is pushed toward the discharge table 45, the product P moves on the two heater rollers 430 and 431 included in the heater unit 43, and the heater roller 430 and 431 causes the stretch film SF to be moved. The overlapping part on the bottom surface of the product P is thermally welded. Thereafter, the product P moves on the transport roller 44 and is transported to the discharge table 45.

  Next, the detailed configuration and operation of the packaging machine 3 will be described.

<Film supply unit and film gripping mechanism>
FIG. 4 is a plan view of the film gripping mechanism including the front gripping portion 34, the rear gripping portion 35, the left gripping portion 36, and the right gripping portion 37 when viewed from the + Z side. FIG. 5 is a front view of the front grip portion 34 as viewed from the −Y side. FIG. 6 is a side view of the front gripping portion 34 and the rear gripping portion 35 when viewed from the −X side.

  As shown in FIGS. 4 and 6, the front gripping part 34 and the rear gripping part 35 are arranged to face each other in the Y direction with the packaging area PA interposed therebetween. The front side grip part 34 and the rear side grip part 35 are disposed on the + Y side and the −Y side, respectively. Moreover, the left side grip part 36 and the right side grip part 37 are arrange | positioned so that it may oppose in the X direction on both sides of packaging area PA. The left grip 36 and the right grip 37 are disposed on the −X side and the + X side, respectively.

  The front gripping portion 34 includes three front lower gripping members 340b arranged in the X direction and a front upper gripping member 340a disposed above (+ Z side) thereof. A plurality of convex portions 340bb arranged in the X direction are formed at the end on the rear grip portion 35 side of each front lower grip member 340b. Thus, the end on the rear grip 35 side of each front lower grip member 340b has a comb shape. Similarly, a plurality of convex portions 340aa arranged in the X direction are formed at the end portion on the rear grip portion 35 side of the front upper grip member 340a. Thus, the end portion on the rear grip portion 35 side of the front upper grip member 340a has a comb shape.

  Each of the three front lower gripping members 340b can be individually moved in the + Z direction and the −Z direction by being driven by driving means (not shown) controlled by the control unit 9. Further, the front gripping part 34 is movable by the driving means (not shown) controlled by the control part 9 so as to be movable in the + Y direction and the −Y direction as a whole. When the −X side front lower gripping member 340b moves in the + Z direction, the −X side portion of the + Y side end of the stretch film SF is gripped by the front lower gripping member 340b and the front upper gripping member 340a. . When the + X-side front lower holding member 340b moves in the + Z direction, the + X-side portion of the + Y-side end of the stretch film SF is held by the front lower holding member 340b and the front-side upper holding member 340a. When the center front lower holding member 340b moves in the + Z direction, the front lower holding member 340b and the front upper holding member 340a hold the central portion of the + Y side end of the stretch film SF.

  The rear grip part 35 includes a first grip part 350 and a second grip part 351. The first gripping part 350 and the second gripping part 351 are arranged along the Y direction so that the first gripping part 350 is on the −Y side. A film cutting unit 33 is provided between the first holding unit 350 and the second holding unit 351. The film cutting unit 33 can be moved in the + Z direction and the −Z direction by being driven by driving means (not shown) controlled by the control unit 9.

  The first gripping part 350 includes an upper gripping member 350a and a lower gripping member 350b disposed below the upper gripping member 350a. The lower gripping member 350b is movable in the + Z direction and the −Z direction by being driven by a driving unit (not shown) controlled by the control unit 9. When the lower gripping member 350b moves in the + Z direction, the stretch film SF is gripped by the lower gripping member 350b and the upper gripping member 350a.

  The second grip 351 includes three lower grip members 351b arranged in the X direction and an upper grip member 351a disposed above them. A plurality of convex portions 351bb arranged in the X direction are formed at the end of each lower gripping member 351b on the front gripping portion 34 side. Accordingly, the end portion of each lower gripping member 351b on the front gripping portion 34 side has a comb-tooth shape. Similarly, a plurality of convex portions 351aa arranged in the X direction are formed at the end of the upper gripping member 351a on the front gripping portion 34 side. Accordingly, the end portion of the upper gripping member 351a on the front gripping portion 34 side has a comb shape.

  Each of the three lower gripping members 351b can be individually moved in the + Z direction and the −Z direction by being driven by driving means (not shown) controlled by the control unit 9. When the −X side lower gripping member 351b moves in the + Z direction, the lower gripping member 351b and the upper gripping member 351a grip the −X side portion of the −Y side end of the stretch film SF. When the + X side lower gripping member 351b moves in the + Z direction, the lower gripping member 351b and the upper gripping member 351a grip the + X side portion of the −Y side end of the stretch film SF. When the central lower gripping member 351b moves in the + Z direction, the lower gripping member 351b and the upper gripping member 351a grip the central portion of the −Y side end of the stretch film SF.

  When the front gripping portion 34 moves in the -Y direction, the comb-shaped end portion of the front upper gripping member 340a in the front gripping portion 34 and the comb teeth of the upper gripping member 351a in the second gripping portion 351 of the rear gripping portion 35 And the plurality of lower gripping members in the second gripping portion 351 of the rear gripping portion 35 and the comb-like end portions of the plurality of front lower gripping members 340b in the front gripping portion 34. The comb-shaped end portions of 351b are fitted to each other.

  The left grip 36 includes an upper grip member 360 and a lower grip member 361 disposed below the upper grip member 360. The lower gripping member 361 is movable in the + Z direction and the −Z direction by being driven by driving means (not shown) controlled by the control unit 9. When the lower gripping member 361 moves in the + Z direction, the upper gripping member 360 and the lower gripping member 361 grip the −X side end of the stretch film SF.

  The right grip 37 includes an upper grip member 370 and a lower grip member 371 disposed below the upper grip member 370. The lower gripping member 371 is movable in the + Z direction and the −Z direction by being driven by driving means (not shown) controlled by the control unit 9. When the lower gripping member 371 moves in the + Z direction, the upper gripping member 370 and the lower gripping member 371 grip the + X side end of the stretch film SF.

  As shown in FIG. 6, a pair of support rollers 50 and 51 that support the film roll FR are provided in the film storage unit 31. Further, a feeding belt 52 for feeding out the stretch film from the film roll FR and a belt roller 53 are provided in the film storage unit 31.

  The support rollers 50 and 51 each extend along the X-axis direction, and are arranged to face each other in the Y-axis direction with the support roller 51 set to the −Y side. Each of the support rollers 50 and 51 is rotatably provided. The film roll FR is placed on such support rollers 50 and 51.

  The belt roller 53 extends along the X-axis direction, and is disposed slightly below the outer side with respect to the one support roller 51. The feeding belt 52 is wound around the support roller 51 and the belt roller 53. The belt roller 53 is rotated by being driven by a driving means (not shown) controlled by the control unit 9. Thereby, the feeding belt 52 rotates.

  When the film roll FR is attached to the packaging machine 3, the film roll FR is placed on the pair of support rollers 50 and 51 by the operator. Then, the stretch film SF is pulled out from the film roll FR by the operator. The leading end of the drawn stretch film SF is gripped by the operator with the upper gripping member 350a of the first gripping part 350 and the lower gripping part 35 so that the stretch film SF contacts the feeding belt 52 from the outside. It is passed between the member 350b. Then, the feeding belt 52 rotates, the stretch film SF is fed out from the film roll FR, and the leading end of the stretch film SF has an upper gripping member 351a of the second gripping portion 351 and a plurality of lower gripping members in the rear gripping portion 35. 351b. At this time, as shown in FIG. 4, the front ends of the stretch film SF are exposed from between the plurality of convex portions 351aa of the upper gripping member 351a and from between the plurality of convex portions 351bb of the plurality of lower gripping members 351b. Exposed. Thereby, the setting to the packaging machine 3 of the film roll FR is completed.

  In the present embodiment, the stretch film SF is wrapped from the film roll FR to the packaging area PA by the pair of support rollers 50, 51, the feeding belt 52, the belt roller 53, the rear gripping portion 35, and the front gripping portion 34. A film supply unit 32 is configured to be supplied.

  Next, the operation of the packaging machine 3 from when the stretch film SF is supplied to the packaging area PA until the stretch film SF is cut from the film roll FR and then the end of the stretch film SF is gripped will be described. 7 to 12 are diagrams illustrating the operation of the packaging machine 3.

  First, as shown in FIG. 7, the front gripping portion 34 moves in the −Y direction, the comb-like end portion of the front upper gripping member 340 a of the front gripping portion 34, and the second gripping at the rear gripping portion 35. The upper gripping member 351a of the upper portion 351 is fitted with the comb-like ends, and the comb-like ends of the plurality of front lower gripping members 340b of the front gripping portion 34 and the second gripping portion 35 in the second gripping portion 35. The comb-shaped ends of the plurality of lower gripping members 351b of the gripping portion 351 are fitted. At this time, the + Y side end of the stretch film SF appearing between the plurality of convex portions 351aa and the plurality of convex portions 351bb of the second gripping portion 351 in the rear gripping portion 35 is in the front gripping portion 34. The front upper holding member 340a and the plurality of front lower holding members 340b are inserted. The front upper gripping member 340a and the plurality of front lower gripping members 340b grip the + Y side end of the stretch film SF.

  Next, as shown in FIG. 8, the front gripping portion 34 moves in the + Y direction. If it does so, stretch film SF will be supplied between the front side holding part 34 and the rear side holding part 35, ie, packaging area PA. In the present embodiment, the distance D1 between the front gripping portion 34 and the rear gripping portion 35 in a state where the stretch film SF is supplied to the packaging area PA is constant regardless of the size of the product P. It is.

  Next, as shown in FIG. 9, when the product P is mounted on the plurality of lift heads 300 of the lift unit 30, the lift unit 30 moves in the + Z direction as shown in FIG. Pushed up against the stretch film SF. At this time, the first gripping part 350 and the second gripping part 351 of the rear gripping part 35 do not grip the stretch film SF, and the stretch film SF can be drawn out freely with respect to the packaging area PA. Therefore, when the product P is pushed up to the stretch film SF, the stretch film SF is fed out from the film roll FR to the packaging area PA. In the present embodiment, the movement amount D2 of the lift head 300 in the + Z direction, that is, the movement amount of the product P in the + Z direction is constant regardless of the size of the product P.

  Next, as shown in FIG. 11, in the rear grip 35, the lower grip member 350b of the first grip 350 moves in the + Z direction, and the plurality of lower grip members 351b of the second grip 351 move in the + Z direction. Move to. Thereby, the 1st holding | grip part 350 and the 2nd holding part 351 hold | grip the stretch film SF drawn | fed out from film roll FR to packaging area PA in the position which mutually separated between film roll FR and packaging area PA. It becomes like this. Furthermore, in the packaging machine 3, the lower gripping member 361 of the left gripping portion 36 moves in the + Z direction, and the lower gripping member 371 of the right gripping portion 37 moves in the + Z direction. Thereby, the −X side end portion and the + X side end portion of the stretch film SF in the packaging area PA are gripped by the left grip portion 36 and the right grip portion 37, respectively.

  Next, as shown in FIG. 12, the film cutting part 33 located between the first gripping part 350 and the second gripping part 351 of the rear gripping part 35 moves in the + Z direction, and the stretch film SF is transferred to the film. Cut from roll FR. Thereby, the stretch film SF only for the part used for the packaging of the goods P is obtained. And the film cutting part 33 moves to -Z direction.

  Thereafter, when the packaging of the product P is completed and the stretch film SF in the packaging area PA no longer exists, the feeding belt 52 rotates, the stretch film SF is fed out from the film roll FR, and the leading end of the stretch film SF is The rear grip 35 is transported between the upper grip member 351a of the second grip 351 and the plurality of lower grip members 351b. Thereafter, similarly, a new stretch film SF is supplied to the packaging area PA, and the product P is packaged.

<Film folding mechanism>
FIG. 13 is a perspective view showing a configuration of a film folding mechanism including the left folding member 38, the right folding member 39, the rear folding member 40, and the front folding member 41. As shown in FIG. 13 and FIG. 2 described above, the front folding member 41 is a round bar-like member extending along the X direction. The front folding member 41 is arranged at the + Y side end of the packaging area PA. Each of the left folding member 38, the right folding member 39, and the rear folding member 40 is a plate-like member. The left folding member 38 and the right folding member 39 are respectively disposed at the −X side and + X side ends of the packaging area PA, and the rear folding member 40 is disposed at the −Y side end of the packaging area PA. Yes. Each of the left folding member 38 and the right folding member 39 is movable along the X direction by being driven by driving means (not shown) controlled by the control unit 9. The rear folding member 40 is movable along the Y direction by being driven by driving means (not shown) controlled by the control unit 9.

  Next, the operation of the film folding mechanism will be described. 14-17 is a figure which shows operation | movement of the left folding member 38 and the right folding member 39. FIG.

  As shown in FIG. 14, when the stretch film SF is cut from the film roll FR in a state where the product P is pushed up with respect to the stretch film SF in the packaging area PA, first, as shown in FIG. 15, The left folding member 38 and the right folding member 39 move in the + X direction and the −X direction, respectively. That is, the left folding member 38 and the right folding member 39 move so as to approach each other. Then, the left folding member 38 sunk into the lower side of the product P while coming into contact with the inclined −X side end portion of the stretch film SF, and the right folding member 39 is tilted + X in the stretch film SF. It comes under the product P while coming into contact with the side end. As a result, the -X side end of the stretch film SF is folded into the lower side of the product P by the left folding member 38, and the + X side end of the stretch film SF is folded into the lower side of the product P by the right folding member 39. It will be.

  When the left folding member 38 and the right folding member 39 move in the + X direction and the −X direction, respectively, in the front gripping portion 34, the −X side and + X side front lower gripping members 340b move in the −Z direction, In the rear grip 35, the −X side and + X side lower grip members 351b of the second grip 351 move in the −Z direction. Thereby, when the left folding member 38 and the right folding member 39 move in the + X direction and the −X direction, respectively, only the central portion of the + Y side end portion of the stretch film SF is gripped by the front grip portion 34, and the stretch film Only the central portion of the −Y side end portion of the SF is gripped by the second grip portion 351 of the rear grip portion 35. Therefore, the front gripping portion 34 and the rear gripping portion 35 do not hinder the folding operation of the left folding member 38 and the right folding member 39.

  Further, in the lift section 30 according to the present embodiment, the upper half of the lift heads 300 other than the central lift head 300 among the plurality of lift heads 300 arranged in the X direction can be tilted inward. Then, as shown in FIG. 15, the left folding member 38 sinks into the lower side of the product P while tilting the upper half portions of the plurality of lift heads 300 located on the −X side from the central lift head 300 inward. Go. Further, the right folding member 39 sinks into the lower side of the product P while tilting the upper half portions of the plurality of lift heads 300 located on the + X side from the central lift head 300 inward. Thereby, even if it is a case where goods P are supported by a plurality of lift heads 300 like this embodiment, both ends of the X direction of stretch film SF can be folded under goods P. .

  When the -X side end of the stretch film SF is folded below the product P by the left folding member 38, the lower gripping member 361 of the left gripping portion 36 is in the -Z direction as shown in FIG. The left grip 36 releases the grip at the −X side end of the stretch film SF. Similarly, when the + X side end of the stretch film SF is folded to the lower side of the product P by the right folding member 39, the lower gripping member 371 of the right gripping portion 37 moves in the -Z direction, and the right side The holding part 37 releases the + X side end of the stretch film SF. Then, the left folding member 38 and the right folding member 39 stop when approaching the central lift head 300. Thereby, folding of the both ends of the X direction in the stretch film SF is completed. Thereafter, as shown in FIG. 17, the lift unit 30 moves in the −Z direction. At this time, the product P is supported by the left folding member 38 and the right folding member 39.

  Next, operations of the rear folding member 40 and the front folding member 41 will be described. 18-21 is a figure which shows operation | movement of the rear side folding member 40 and the front side folding member 41. FIG.

  When the folding of both ends in the X direction of the stretch film SF is completed, the rear folding member 40 moves in the + Y direction as shown in FIG. Then, as shown in FIG. 19, the rear folding member 40 enters the lower side of the product P while abutting the inclined −Y side end portion of the stretch film SF. As a result, the −Y side end of the stretch film SF is folded into the lower side of the product P by the rear folding member 40. The second grip portion 351 of the rear grip portion 35 releases the grip of the stretch film SF while the −Y side end of the stretch film SF is folded under the product P by the rear folding member 40. To do.

  When the −Y side end of the stretch film SF is folded to the lower side of the product P, as shown in FIG. 20, the discharge pusher 42 positioned above the second grip 351 of the rear grip 35 is + Y direction. Move to. The discharge pusher 42 pushes the lateral side of the product P in the + Y direction. If it does so, the front side folding member 41 will come under the goods P, contacting the inclined + Y side edge part in the stretch film SF. Thereby, the + Y side end of the stretch film SF is folded into the lower side of the product P by the front folding member 41.

  The front side grip part 34 releases the grip of the stretch film SF while the + Y side end part of the stretch film SF is being folded into the lower side of the product P. When the discharge pusher 42 further pushes the product P in the + Y direction, the + Y side end portion of the stretch film SF is completely folded under the product P as shown in FIG. Thereby, the peripheral part of stretch film SF is folded in the lower side of goods P. FIG. Then, the product P is conveyed to the discharge table 45 by the discharge pusher 42.

<Heater part>
The heater unit 43 of the packaging machine 3 includes two heater rollers 430 and 431 as shown in FIG. Each of the heater rollers 430 and 431 and the transport roller 44 extends along the Y-axis direction. The front folding member 41, the heater roller 430, the heater roller 431, the transport roller 44, and the discharge table 45 are arranged in this order along the + Y direction. The heater rollers 430 and 431 are heated by heating means (not shown) controlled by the control unit 9. The product P conveyed toward the discharge table 45 by the discharge pusher 42 moves on the heater rollers 430 and 431. Thereby, the part which overlaps with the bottom face of the goods P in the stretch film SF is heat-welded by the heater rollers 430 and 431. Thereafter, the product P moves on the transport roller 44 and is placed on the discharge table 45.

  The packaging operation of the packaging machine 3 as described above is realized by the control unit 9 controlling the packaging machine 3 based on the packaging conditions according to the product P to be packaged. Based on the product master file 800 and the tray master file 801 stored in the storage unit 8, the control unit 9 acquires the packaging conditions corresponding to the product P to be packaged.

  FIG. 22 is a diagram showing an example of the product master file 800. As shown in FIG. 22, the product master file 800 has a table format, and includes information such as a product number for identifying the product P, a product name, a unit price, and a tray number for identifying the tray. It is out. In the product master file 800, the product name and unit price for the product P specified by the product number, the tray number for the tray used for the product P, and the like are associated with each product number.

  FIG. 23 is a diagram showing an example of the tray master file 801. As shown in FIG. 23, the tray master file 801 has a table format and includes information such as a tray number, a tray size, a tray material, and packaging conditions. In the tray master file 801, each tray number is associated with a tray size, a tray material, a packaging condition, and the like for the tray specified by the tray number. There are two types of tray materials: “hard tray” which means a relatively hard material and “soft tray” which means a relatively soft material. Further, the packaging conditions include the amount of movement of the left folding member 38, the right folding member 39, and the rear folding member 40, and the front gripping portion 34, the rear gripping portion 35, the left gripping portion 36, and the right gripping portion 37 are stretch films. The timing for releasing the gripping of the SF is included.

  Here, as described above, in the weighing and packaging value-adding machine 1 according to the present embodiment, not only the product P in which the contents are mounted on the tray but also the product P in which the tray is not used (hereinafter referred to as “no tray”). Packaging can also be performed on the product P). In the present embodiment, in the tray master file 801, in order to manage not only the packaging conditions for the product P for which the tray is used, but also the packaging conditions for the product P with no tray, For convenience, the tray number is associated. In the example of FIG. 22, “005” and “006” are tray numbers associated with the packaging conditions of the product P without tray. The tray material associated with the packaging condition of the product P without tray is associated with a tray material called “note tray”. Further, the “tray size” associated with the tray number indicates the size of the non-tray product P when temporarily represented by the size of the tray.

  When starting the processing of a certain product P in the weighing and packaging price setting machine 1, the user inputs the product number of the product P to the weighing and packaging price setting machine 1 using the operation unit 7. This product number is input to the control unit 9. The control unit 9 refers to the product master file 800 and acquires a tray number associated with the input product number. Next, the control unit 9 refers to the tray master file 801 and acquires the packaging conditions associated with the acquired tray number. Thereby, the control part 9 can acquire the packaging conditions according to the goods P to be packaged. Then, the control part 9 controls the packaging machine 3 based on the acquired packaging conditions.

  As described above, in the packaging machine 3 according to the present embodiment, in a state where the stretch film SF can be unwound from the film roll FR with respect to the packaging area PA, the product P that is an object to be packaged is the packaging area PA. Therefore, the stretch film SF is fed out to the packaging area PA by an amount corresponding to the size of the product P. Therefore, in the state where the product P is pushed up with respect to the stretch film SF in the packaging area PA as in the present embodiment, the stretch film SF is cut from the film roll FR (see FIG. 11), and automatically. A stretch film SF having an appropriate length can be obtained.

  24 and 25 are diagrams showing the operation of the packaging machine 3 when packaging a product P larger than the product P shown in FIGS. FIG. 24 shows a state immediately before the product P is pushed up to the stretch film SF, and FIG. 25 shows a state immediately after the product P is pushed up to the stretch film SF. As can be understood by comparing FIG. 10 and FIG. 25, when the tall product P is pushed up to the stretch film SF, the stretch film SF is pushed up to a higher position. Many stretch films SF are fed out from the FR to the packaging area PA. Moreover, when the product P having a large dimension in the Y direction is pushed up to the stretch film SF, the dimension in the Y direction of the portion pushed up by the product P in the stretch film SF becomes large. Many stretch films SF are fed out from the FR to the packaging area PA.

  Thus, in a state where the stretch film SF can be fed out from the film roll FR with respect to the packaging area PA, the product P is pushed up with respect to the stretch film SF in the packaging area PA, and then the stretch film SF is By cutting from the film roll FR, a stretch film SF having an appropriate length according to the size of the product P can be automatically obtained. Therefore, waste of the stretch film SF can be eliminated. Further, it is not necessary to adjust the length of the stretch film SF in the packaging area PA by changing the distance D1 between the front gripping portion 34 and the rear gripping portion 35 for each product P. In particular, when packaging products P of natural products such as vegetables and fruits directly without being mounted on a tray, the size of each product P varies, so the stretch film used for packaging as in this embodiment Obtaining SF is very effective.

  Further, in the present embodiment, as shown in FIG. 12 described above, the stretch film SF fed to the packaging area PA is in the state of being gripped by the first gripping part 350 and the second gripping part 351. Since the cutting is performed between the grip portion 350 and the second grip portion 351, the stretch film SF can be easily cut.

<Modification 1>
In this modification, another method that can automatically obtain a stretch film SF having an appropriate length according to the size of the product P will be described.

  FIG. 26 is a side view showing a part of the configuration of the weighing and transporting mechanism 2 and the packaging machine 3 of the weighing and packaging pricing machine 1 according to this modification, and FIG. 27 shows the weighing and packaging pricing machine 1 according to this modification. FIG. 2 is a plan view showing a part of the configuration of the weighing transport mechanism 2 and the packaging machine 3. In FIG. 26, the illustration of the left side cover 101 shown in FIG. 27 is omitted.

  As shown in FIGS. 26 and 27, the weighing and conveying mechanism 2 is provided with a plurality of commodity detection sensors 110 to 112. The product detection sensors 110 to 112 are, for example, optical sensors, and the product P placed on the placement unit 21 of the weighing and transporting mechanism 2 until the product P is transported to the lift unit 30 of the packaging machine 3 by the transport unit 22. It is arranged in the transport route.

  The product detection sensor 110 includes a projector / receiver 110a and a reflector 110b, the product detection sensor 111 includes a projector / receiver 111a and a reflector 111b, and the product detection sensor 112 includes a projector / receiver 112a and a reflector 112b. The housing 10 of the weighing / packaging machine 1 has a + X side right side cover 100 and a −X side left side, which are disposed opposite to each other in the X-axis direction between the placing portion 21 and the lift portion 30. A side cover 101 is provided. The light emitters / receivers 110a to 112a are attached to the inner surface of the right side cover 100 so that the positions in the Y axis direction and the Z axis direction are different from each other. The reflectors 110b to 112b are attached to the inner surface of the left side cover 101 so that the positions in the Y-axis direction and the Z-axis direction are different from each other. The light projector / receiver 110a and the reflector 110b are arranged opposite to each other in the X axis direction, the projector / receiver 111a and the reflector 111b are arranged opposite to each other in the X axis direction, and the projector / receiver 112a and the reflector 112b are arranged in the X axis direction. Are arranged opposite to each other.

  In the commodity detection sensor 110 as described above, when the commodity P does not exist between the light projector / receiver 110a and the reflector 110b, the light output from the light projector / receiver 110a is reflected by the reflector 110b and the light projector / receiver 110a. Is detected. On the other hand, when the product P exists between the light projecting / receiving device 110a and the reflecting plate 110b, the light output from the light projecting / receiving device 110a is blocked by the product P and is not detected by the light projecting / receiving device 110a. As described above, the commodity detection sensor 110 detects the commodity P depending on whether or not the light output from the light projector / receiver 110a is detected by the light projector / receiver 110a. In each of the product detection sensors 111 and 112, the product P is similarly detected. The detection result of the product P by the product detection sensors 110, 111, and 112 is input to the control unit 9.

  In this modification, the control unit 9 uses the detection results of the product P by the product detection sensors 110, 111, and 112, and uses the height (length in the Z-axis direction) and depth (in the Y-axis direction) of the product P. (Length). As shown in FIG. 26, in the commodity detection sensors 110 to 112, the positions of the light projecting / receiving devices 110a to 112a in the Z-axis direction are different from each other, and the positions of the reflecting plates 110b to 112b are different from each other. Therefore, the detection result of the product P by the product detection sensors 110 to 112 changes depending on the height of the product P. For example, when the height of the product P is lower than the position of the product detection sensor 112 arranged at the lowest position, the product P is not detected in all of the product detection sensors 110 to 112, and the product P is at the highest position. When the height of the product P is higher than the position of the placed product detection sensor 110, the product P is detected by all of the product detection sensors 110 to 112. Therefore, the control part 9 can obtain | require the approximate height of the said goods P based on the detection result of the goods P in the goods detection sensors 110-112.

  The storage unit 8 stores in advance the moving speed of the transport unit 22 in the -Y direction (the transport speed of the product P). And the control part 9 is based on the said moving speed in the memory | storage part 8, and the time which has detected the goods P in the goods detection sensor which has detected the goods P among the goods detection sensors 110-112. The depth of the product P is obtained. For example, if the moving speed of the transport unit 22 is Vcm / sec and the time during which the product detection sensor 110 detects the product P is Tsec, the depth of the product P is (V × T) cm.

  Further, in the present modification, the control unit 9 obtains the position of the product P on the transport unit 22 in the Y-axis direction using the detection result of the product P by the product detection sensors 110 to 112. And the control part 9 estimates the position of the Y-axis direction of the said goods P on the lift part 30 from the position of the Y-axis direction of the goods P on the conveyance part 22. FIG. If the position of the product P on the transport unit 22 changes, the position of the product P on the lift unit 30 also changes accordingly. Therefore, the control unit 9 determines the Y of the product P on the transport unit 22. From the position in the axial direction, the position in the Y-axis direction of the product P on the lift unit 30 can be estimated. The control unit 9 according to this modification measures the time from when the transport unit 22 starts transporting the product P to when the product P is first detected by the product detection sensors 110 to 112. The position of the product P on the transport unit 22 in the Y-axis direction is obtained based on the above. Hereinafter, the time from when the conveyance unit 22 starts conveying the product P to when the product detection sensors 110 to 112 detect the product P for the first time is simply referred to as “measurement time”. When the product P is located on the front side (−Y side) on the transport unit 22, the measurement time is shortened, and when the product P is located on the rear side (+ Y side) on the transport unit 22. The measurement time becomes longer. Thus, since the measurement time changes according to the position of the product P on the transport unit 22 in the Y-axis direction, the control unit 9 determines the product P on the transport unit 22 in the Y-axis direction based on the measurement time. Can be determined.

  When the control unit 9 obtains the height and depth of the product P and the position of the product P on the lift unit 30 in the Y-axis direction as described above, the control unit 9 determines the packaging conditions based on the information. Specifically, the control unit 9 determines the length of the stretch film SF used for packaging the product P, the position of the stretch film SF in the packaging area PA, the stretch film SF in the front gripping portion 34 and the rear gripping portion 35. The opening timing of gripping, the amount of movement of the rear folding member 40, etc. are determined.

  Here, in the above example, in a state where the stretch film SF can be fed from the film roll FR to the packaging area PA, the product P is pushed up against the stretch film SF of the packaging area PA, and then Since the stretch film SF is cut from the film roll FR, the length of the stretch film SF used for packaging is naturally determined.

  On the other hand, in the packaging machine 3 of the present modification, the film is cut in a state where the front gripping portion 34 and the rear gripping portion 35 grip both ends in the Y-axis direction of the stretch film SF supplied to the packaging area PA. The section 33 cuts the stretch film SF from the film roll FR, and then the lift section 30 pushes up the product P against the obtained stretch film SF having a predetermined length. Therefore, in the packaging machine 3, it is necessary to determine the length of the stretch film SF used for packaging. In this modification, the control unit 9 determines the length of the stretch film SF used for packaging the product P based on the height and depth of the product P. For example, when the height of the product P is large or the depth of the product P is large, the length of the stretch film SF used for packaging is increased, and the height of the product P is small, or the depth of the product P When is small, the length of the stretch film SF used for packaging is shortened. In this case, the control unit 9 may determine the length of the stretch film SF used for packaging the product P based only on the height and depth of the product P. Alternatively, the reference value of the stretch film SF used for packaging is included in the packaging conditions stored in the storage unit 8, and the control unit 9 determines the reference value based on the height and depth of the product P to be packaged. You may determine the length of the stretch film SF used finally by correct | amending.

  In addition, the stretch film SF used for packaging is changed by changing the distance D1 (see FIG. 8) between the front gripping portion 34 and the rear gripping portion 35 in a state where the stretch film SF is supplied to the packaging area PA. The length of can be changed.

  Moreover, the control part 9 of this modification determines the position of the stretch film SF in the packaging area PA based on the position of the product P on the lift part 30 in the Y-axis direction. Specifically, the control unit 9 sets the position of the stretch film SF so that the stretch film SF is located directly above the product P on the lift unit 30. In this case, the control unit 9 may determine the position of the stretch film SF using only the position of the product P on the lift unit 30 in the Y-axis direction. Alternatively, the control unit 9 includes the reference value of the position of the stretch film SF in the packaging area PA in the packaging conditions stored in the storage unit 8, and the control unit 9 uses the reference value in the Y-axis direction of the product P on the lift unit 30. The final position of the stretch film SF may be determined by performing correction based on the position.

  In addition, not only the front side grip part 34 but also the rear side grip part 35 can be moved in the Y-axis direction, and the stretch film in the packaging area PA is changed by changing the absolute positions of both the front side grip part 34 and the rear side grip part 35. The position of the SF can be changed.

  Further, the control unit 9 of this modification determines the release timing of the gripping of the stretch film SF by the front gripping part 34 and the rear gripping part 35 based on the position of the product P on the lift part 30 in the Y-axis direction. To do. For example, when the product P is positioned on the rear side (−Y side) on the lift unit 30, the control unit 9 accelerates the release timing of gripping the stretch film SF with the rear grip unit 35, and The release timing of gripping the stretch film SF at the grip portion 34 is delayed. In this case, the control unit 9 uses only the position of the product P on the lift unit 30 in the Y-axis direction to determine the release timing of the gripping of the stretch film SF by the front gripping unit 34 and the rear gripping unit 35. You may do it. Alternatively, the control unit 9 includes the reference value of the opening timing of gripping the stretch film SF at the front gripping part 34 and the rear gripping part 35 in the packaging conditions stored in the storage unit 8. By correcting based on the position of the product P on the lift unit 30 in the Y-axis direction, the final release timing of gripping the stretch film SF by the front gripping portion 34 and the rear gripping portion 35 may be determined. .

  Further, the control unit 9 according to the present modification determines the amount of movement of the rear folding member 40 based on the position of the product P on the lift unit 30 in the Y-axis direction. For example, when the product P is positioned on the rear side (−Y side) on the lift unit 30, the movement amount of the rear folding member 40 is reduced. In this case, the control unit 9 may determine the amount of movement of the rear folding member 40 using only the position of the product P on the lift unit 30 in the Y-axis direction. Alternatively, the control unit 9 includes the reference value of the movement amount of the rear folding member 40 in the packaging conditions stored in the storage unit 8, and the control unit 9 sets the reference value in the Y-axis direction of the product P on the lift unit 30. The final movement amount of the rear folding member 40 may be determined by correcting based on the position.

  Thus, by providing the product detection sensors 110 to 112 and obtaining the height and depth of the product P and the position of the product P on the lift unit 30 in the Y-axis direction, the packaging suitable for the product P is obtained. The condition can be obtained automatically. In particular, when directly wrapping products P of natural products such as fruits and vegetables, even if the products P are of the same type, the size varies, so the same types of products P are packaged using the same packaging conditions. When doing so, the packaging finish accuracy varies. Like this modification, by determining the length of the stretch film SF used for packaging based on the detection results of the product detection sensors 110 to 112, the size between the plurality of products P of the same type is reduced. Even in the case of variations, it is possible to suppress variations in packaging finish accuracy.

<Modification 2>
When packaging natural products P such as vegetables and fruits directly, the size of the same type of product P varies, so the stretch of the stretch film SF covering the product P may vary. There is.

  Therefore, as disclosed in Patent Document 2, a left folding member is used by a motor whose output torque is limited so that the output torque does not become larger than a predetermined limit value (hereinafter referred to as “motor with torque limit”). It is conceivable to drive 38. In this case, the moving speed of the left folding member 38 is detected, and the opening timing of gripping the stretch film SF at the left gripping part 36 is controlled based on the timing when the moving speed becomes smaller than a predetermined value. The same applies to the right folding member 39 and the rear folding member 40.

  However, when the product P becomes smaller, the moving speed of the left folding member 38 becomes smaller than a predetermined value in a state in which the left folding member 38 is separated from the product P, and the release timing of the gripping of the stretch film SF at the left gripping portion 36. May be earlier than desired. As a result, the −X side end of the stretch film SF may not be properly folded under the product P. The same applies to the right folding member 39 and the rear folding member 40.

  Therefore, in this modification, a packaging machine 3 that can appropriately fold the peripheral edge of the stretch film SF to the lower side of the product P will be described.

  28-35 is a figure which shows a mode that the -X side edge part of stretch film SF is folded under the goods P in the packaging machine 3 which concerns on this modification. In the packaging machine 3 according to this modification, the left folding member 38 is moved along the X-axis direction by being driven by a torque-limited motor 138 controlled by the control unit 9. Further, the left grip 36 moves along the X-axis direction by being driven by a drive motor 136 controlled by the controller 9. Further, the packaging machine 3 is provided with a motor rotation detection unit 236 that detects the rotation amount of the drive motor 136 and a motor rotation detection unit 238 that detects the rotation amount of the motor 138 with torque limitation. The controller 9 obtains the amount of movement of the left grip 36 in the + X direction based on the amount of rotation of the drive motor 136 detected by the motor rotation detector 236. Further, the control unit 9 obtains the amount of movement of the left grip 36 in the + X direction based on the amount of rotation of the motor 138 with torque limitation detected by the motor rotation detection unit 238. And the control part 9 calculates | requires the distance between the left side holding part 36 and the left side folding member 38 in a X-axis direction based on the movement amount of + X direction of the left side holding part 36 and the left side folding member 38. FIG.

  In the packaging machine 3, when the −X side end of the stretch film SF is folded below the product P, as shown in FIG. 28, the left folding member 38 moves in the + X direction, and the stretch film SF In contact with the inclined -X side end. Then, the left folding member 38 moves in the + X direction while contacting the −X side end of the stretch film SF.

  When the left folding member 38 moves in the + X direction while contacting the stretch film SF, the tension generated in the stretch film SF (hereinafter simply referred to as “film tension”) increases, and the output torque of the motor 138 with torque limitation increases. To do. Therefore, as the left folding member 38 moves in the + X direction, the output torque of the motor 138 with torque limitation becomes a predetermined limit value, and as shown in FIG. 29, the left folding member 38 is in the + X direction. Will stop moving.

  When the left folding member 38 stops, the left grip 36 moves by a predetermined distance in the + X direction as shown in FIG. If it does so, film tension will reduce, As a result, the output torque of the motor 138 with a torque limitation will fall, and as shown in FIG. 31, the movement to the + X direction of the left folding member 38 will restart.

  Thereafter, as the left folding member 38 moves in the + X direction, the output torque of the motor 138 with torque limitation becomes a predetermined limit value, and the movement in the + X direction of the left folding member 38 stops again. Become. Then, as shown in FIG. 32, the left grip 36 again moves a predetermined distance in the + X direction. Thereafter, the left grip 36 and the left folding member 38 operate in the same manner, and the left folding member 38 sinks under the product P as shown in FIG.

  When the left folding member 38 comes into the lower side of the product P, that is, when the folding of the −X side end of the stretch film SF into the lower side of the product P is started, in the case of FIGS. Compared with the case where the product P is not folded at the −X side end of the stretch film SF), the left side folding member 38 is in contact with the left side of the stretch film SF on the left side. Even if the folding member 38 is moved a little, a larger tension is generated. As a result, when the product P is folded downward at the −X side end of the stretch film SF, the stopped left folding member 38 moves as compared with the case of FIGS. The distance by which the left folding member 38 moves from the restart to the stop again becomes smaller. Therefore, when the folding of the product P about the −X side end of the stretch film SF starts, the distance between the left folding member 38 and the left grip 36 in the X-axis direction decreases. That is, the left folding member 38 and the left grip 36 come closer to each other.

  As shown in FIG. 34, the control unit 9 according to the present modification is based on the amount of movement in the + X direction of the left gripping part 36 and the left folding member 38 when the left folding member 38 and the left gripping part 36 approach each other. When the obtained distance D3 between the left gripping part 36 and the left folding member 38 in the X-axis direction is equal to or less than a predetermined value, the left gripping part 36 is controlled as shown in FIG. 36 releases the grip on the −X side end of the stretch film SF. Thereafter, the left folding member 38 stops when it moves a predetermined distance from the initial position. Thereby, the folding to the lower side of the goods P about the -X side edge part of stretch film SF is completed.

  Thus, when the distance D3 between the left side gripping part 36 and the left side folding member 38 in the X-axis direction is equal to or less than a predetermined value, the left side folding member is released by releasing the grip on the −X side end of the stretch film SF. In a state where 38 is sufficiently under the product P, the grip on the −X side end of the stretch film SF can be released. Therefore, the −X side end of the stretch film SF can be appropriately folded under the product P.

  The control unit 9 moves the left gripping part 36 by a predetermined distance after a sufficiently long time has elapsed since the left folding member 38 starts moving in the + X direction, whereby the output of the torque-limited motor 138 is output. After the torque becomes a limit value and the movement of the left folding member 38 stops, the left grip 36 can be moved by a predetermined distance. Therefore, in this case, it is not necessary to detect whether the left grip 36 has stopped.

  Alternatively, the motor rotation detection unit 238 detects the rotation speed of the torque-limited motor 138, and the control unit 9 obtains the moving speed of the left folding member 38 in the + X direction based on the rotation speed. And the control part 9 moves the left side holding part 36 only the predetermined distance, when the moving speed of the left folding member 39 becomes zero. Thereby, after the output torque of the motor 138 with torque limitation becomes a limit value and the movement of the left folding member 38 is stopped, the left grip portion 36 can be moved by a predetermined distance. In this case, the left grip 36 may be moved by a predetermined distance before the moving speed of the left folding member 38 becomes zero, that is, when the moving speed becomes lower than a predetermined value.

  Further, by operating the right folding member 39 and the right grip 37 in the same manner, the + X side end of the stretch film SF can be appropriately folded below the product P. In addition, the −Y side end of the stretch film SF can be appropriately folded below the product P by operating the rear folding member 40 and the second grip 351 of the rear grip 35 in the same manner.

<Modification 3>
In the above-described embodiment and Modifications 1 and 2, the packaging conditions such as the length of the stretch film SF used for packaging and the release timing of gripping of the stretch film SF at the gripping portion such as the left gripping portion 36 are automatically set. Had been decided.

  However, the packaging conditions automatically determined as described above may not be the optimum packaging conditions.

  In view of this, in the weighing packaging price attaching machine 1 according to this modification, the adjustment amount for the automatically determined packaging conditions can be registered by the user for each product P. This modification will be specifically described below.

  When a user registers an adjustment amount for a certain target product P in the weighing and packaging price-adding machine 1, the user inputs a sample of the target product P into the weighing and packaging price-adding machine 1 and Operate on a trial basis. In the weighing and packaging price adding machine 1, the packaging conditions are automatically determined as described above, and the sample of the target product P is packaged under the packaging conditions. And a user confirms the packaging finish about the sample of the target goods P. FIG. Thereafter, the user operates the operation unit 7 to input the adjustment amount for the automatically determined packaging condition into the weighing packaging price adding machine 1 based on the packaging finish of the sample of the target product P. The control unit 9 registers the adjustment amount input to the weighing / packaging machine 1 in the product master file 800 in association with the product number for the target product P. FIG. 36 is a diagram illustrating a state in which adjustment amounts are registered in the product master file 800.

  The adjustment amount registered in the product master file 800 includes an automatically determined offset amount with respect to the length of the stretch film SF, and an automatically determined stretch film SF at the gripping portion such as the left gripping portion 36. There is an offset amount with respect to the release timing of gripping.

  When the measurement packaging price attaching machine 1 performs packaging of the product P, the control unit 9 refers to the product master file 800 and acquires the adjustment amount associated with the product number of the product P. And the control part 9 adjusts the packaging conditions determined automatically based on the acquired adjustment amount. For example, in the first modification, the control unit 9 adjusts the distance D1 between the front side gripping part 34 and the rear side gripping part 35 in a state where the stretch film SF is supplied to the packaging area PA. The length of the stretch film SF used is adjusted.

  In this way, by making it possible to register the adjustment amount for the automatically determined packaging conditions, the product P can be packaged more appropriately. It should be noted that the adjustment amount in the product master file 800 is desirably updated periodically.

<Modification 4>
The size of natural products such as vegetables and fruits changes depending on the season, and when packaging natural products directly without using a tray, it is necessary to reset the packaging conditions according to the size. In addition, a plurality of vegetables, fruits, etc. may be packaged in a plurality of units as one product P. In addition, there are multiple types of stacking (arrangement) of components at that time, such as side by side and stacking. Furthermore, as for vegetables and fruits, only one of them divided into a plurality, such as 1/2 or 1/4, may be packaged. When the packaging unit (number), the stacking method of components (horizontal stacking, stacking), and the cutting method (1/2, 1/4) change in the product P without tray, the packaging conditions are set accordingly. I need to fix it.

  The user can set new packaging conditions using the tray list screen 500 and the production screen 501 displayed on the display unit 5. FIG. 37 is a view showing an example of the tray list screen 500. As shown in FIG. 37, the tray list screen 500 shows the tray number, tray name, tray size (width, depth, height) and the like. The tray name associated with the tray number is information that can identify the packaging condition associated with the tray number. In the example of FIG. 37, for example, from the tray name associated with the tray number “0001”, the user sets the packaging condition suitable for the non-tray product P having a single packaging unit and a large size to the tray number “0001”. It can be understood that it is associated with "". Further, from the tray name associated with the tray number “0005”, the user can wrap the packaging suitable for the non-tray product P in which the packaging unit is three, the components are arranged side by side, and the size of each component is large. It can be understood that the condition is associated with the tray number “0005”. Also, from the tray name associated with the tray number “0008”, the user is suitable for the product P with no tray, in which the packaging unit is three, the component is stacked in a stacking manner, and the size of each component is small. It can be understood that the packaging conditions are associated with the tray number “0008”. Thus, since the user can specify the packaging condition from the tray name, the user can specify the tray number associated with the newly set packaging condition.

  FIG. 38 is a diagram illustrating an example of a production screen 501 for a certain processing target product P in the weighing and packaging price assignment machine 1. As shown in FIG. 38, the production screen 501 shows the name of the target product P (“cucumber” in the example of FIG. 38), the processing date, the expiration date, and the like. The production screen 501 shows a five selling price table 1501. In the five selling price table 1501, five types of selling prices for the target product P are shown. Further, in the five selling price table 1501, for each of the five types of selling prices, a packaging unit (shown in the column “symbol” in FIG. 38) for the target product P when sold at the selling price, A tray number (shown in the column of “Tray No.” in FIG. 38) associated with packaging conditions suitable for the target product P when sold at the selling price is shown. Further, in the five selling price table 1501, unit prices of “1” to “5” are associated with five types of selling prices. When the user presses an area where a unit price number is indicated on the production screen 501 and selects the unit price number, the packaging condition related to the tray number associated with the selected unit price number is stored in the weighing and packaging price adding machine 1. Is set. The selling price, packaging unit, tray number, and tray name associated with the tray number selected by the user are the selling price display field 1502, the packaging unit display field 1503, the tray number display field 1504, and the tray name associated with the tray number. It is shown in the tray name display field 1505, respectively.

  The user can set a new packaging condition by switching the unit price number to be selected while confirming the tray name that can specify the packaging condition shown in the tray name display field 1505.

  In addition, the user specifies a tray number associated with a newly set packaging condition by using a correspondence table between a tray number and a tray name, and selects a unit number associated with the identified tray number. Thus, new packaging conditions can be set.

  In addition, the user temporarily displays the tray list screen 500 on the display unit 5, refers to the tray name on the tray list screen 500, and refers to the tray number associated with the packaging condition newly set from the tray list screen 500. Is identified. Then, the user switches the display on the display unit 5 to the production screen 501 and selects the unit price number associated with the specified tray number. Thereby, a new packaging condition is set.

  As described above, when a new packaging condition is set using the production screen 501 and the tray list screen 500, the display of the tray name display field 1505 is confirmed while the unit price number to be selected is switched, or the display unit 5 is displayed. Since it is necessary to display the tray list screen 500 once, the number of operations on the display unit 5 which is a touch panel increases, and the work time becomes longer. Also, when specifying the tray number associated with the newly set packaging conditions by using the correspondence table between the tray number and the tray name, the tray number cannot be immediately specified. Work time will be longer.

  Therefore, the production screen 501 is changed as shown in FIGS. This makes it possible to set new packaging conditions immediately. This point will be described in detail below.

  As shown in FIG. 39, in the five selling price table 1501 of the production screen 501 according to the present modification, the packaging condition associated with the tray number is displayed in the column where the tray number is displayed instead of the tray number. The information that can specify is shown by a graphic 1501a. For example, the graphic 1501a associated with the unit price number “1” is a packaging condition suitable for the product P without tray with three packaging units, the components arranged side by side, and the size of each component is large. It is shown that. Further, the figure 1501a associated with the unit price number “4” is a packaging condition suitable for the non-tray product P in which the packaging unit is three, the arrangement of the components is stacked, and the size of each component is small. It shows that there is.

  FIG. 40 is a diagram showing another example of the production screen 501. In the five selling price table 1501 of the production screen 501 shown in FIG. 40, in addition to the tray number, information that can specify the packaging conditions associated with the tray number is a character string in the tray number display field. 1501b. For example, the character string 1501b associated with the unit price number “2” is a packaging condition suitable for a non-tray product P in which the packaging unit is three, the components are arranged side by side, and the size of each component is small. It shows that there is. In addition, the character string 1501b associated with the unit number “3” is a packaging condition suitable for the product P with no tray, in which the packaging unit is three, the arrangement of the components is stacked, and the size of each component is large. It is shown that.

  In this way, in the 5 selling price table 1501, the user can immediately specify the unit number corresponding to the newly set packaging condition by indicating the information that can specify the packaging condition with a graphic or character string. Can do. Therefore, the user can set new packaging conditions immediately.

  Note that the user can register the packaging conditions for each tray number in the weighing and packaging price adding machine 1 using the tray registration screen 502. FIG. 41 is a view showing an example of the tray registration screen 502. FIG. 41 shows a tray registration screen 502 for associating packaging conditions with the tray number “0001”. In the tray registration screen 502, not only the packaging conditions but also the tray name, tray size, tray material, packaging speed, supply speed, and the like can be associated with the tray number.

  Further, when the user newly associates a tray number with the product P without tray, the user operates the display unit 5 to display the packaging condition list screen 503 on the display unit 5. FIG. 42 is a diagram showing an example of the packaging condition list screen 503. As shown in FIG. 42, the packaging condition list screen 503 shows information that can specify the packaging conditions, for example, in a graphic form. When the user presses a graphic capable of specifying a packaging condition suitable for the target non-tray product P on the packaging condition list screen 503 and selects the graphic, the selected packaging condition is selected from the plurality of tray numbers. A tray list screen 500 including only the associated tray number is displayed on the display unit 5. FIG. 43 is a diagram showing this state. Thereafter, when the user presses the tray number displayed on the tray list screen 500 and selects the tray number, the selected tray number is associated with the target non-tray product P. In this way, since the tray list screen 500 shows only the tray number associated with the packaging condition suitable for the target product P among the plurality of tray numbers, the user can select the tray number immediately. it can.

<Modification 5>
In the case where the weighing and packaging price changing machine 1 and the automatic feeding machine are linked to correspond to the automatic line, when the product P is supplied to the weighing and packaging price setting machine 1 by the conveyance bar of the automatic feeding machine, the weighing and feeding mechanism 2 The product P may not be placed at an appropriate position on the placement unit 21. As a result, the finishing accuracy of the packaging may deteriorate. This is because the frictional force between the placement unit 21 and the product P changes depending on the weight of the product P, the center of gravity, and the state of the bottom surface, and the stopping distance on the placement unit 21 for the slippery product P becomes longer. It is caused by that. In such a case, it is necessary to take a measure such as temporarily suspending the line and replacing the product P, resulting in a decrease in production efficiency.

  In order to solve such a problem, it is conceivable that the user changes the conveyance speed of the automatic feeder according to the product P. Thereby, the slip of goods P can be decreased. In such a case, if the conveyance speed of the automatic feeder can be set finely, the setting of the conveyance speed for each product P becomes very complicated. Therefore, switching of the conveyance speed of the automatic feeder is realistic in two stages, low speed and high speed, or three stages, low speed, medium speed, and high speed. In this case, since the difference between the set values of the plurality of stages with respect to the conveyance speed becomes large, if the conveyance speed is changed to, for example, a low speed, the conveyance speed is greatly reduced, resulting in a decrease in production efficiency.

  Furthermore, even if it is the same goods P, a slip state changes with various conditions at the time of production, and the setting of a conveyance speed may need to be changed each time. Therefore, even if the number of set values of the conveyance speed is reduced in the automatic feeder, the setting of the conveyance speed by the user is not so simplified.

  Therefore, in this modification, an amount of protrusion of the product P from an appropriate position on the placement unit 21 (hereinafter simply referred to as “the amount of protrusion”) is detected, and the automatic feeder is determined based on the amount of protrusion. Adjust the transport speed. Accordingly, the conveyance speed of the automatic feeder is automatically adjusted according to the sliding condition of the product P, and the product P is arranged at an appropriate position on the placement unit 21. Accordingly, production efficiency can be improved without complicated settings by the user. Below, this modification is demonstrated in detail.

  FIG. 44 is a diagram for explaining the present modification. In the present modification, an automatic recognition device is provided that automatically recognizes the product P on the placement unit 21 of the weighing and conveying mechanism 2 of the weighing and packaging price adding machine 1. This automatic recognition apparatus is composed of, for example, a camera. The automatic recognition device detects the size of the product P and detects the amount of protrusion of the product P.

  As shown in FIG. 44, the main control unit that integrally controls the entire line including the weighing and packaging pricing machine 1 and the automatic feeder supplies the product P from the automatic feeder to the placement unit 21. The recognition request is notified to the automatic recognition apparatus. The automatic recognition apparatus to which the recognition request is notified detects the size and the amount of protrusion of the product P in the placement unit 21 and notifies them to the main control unit. The main control unit notifies the control unit 9 of the weighing and packaging value adding machine 1 of the notified size and protruding amount of the product P. The control unit 9 identifies the product P based on the notified size of the product P, and controls the packaging machine 3 so as to operate under packaging conditions appropriate for the product P. Further, the control unit 9 obtains an adjustment amount of the conveyance speed of the automatic feeder based on the notified amount of protrusion, and notifies the automatic feeder of the obtained adjustment amount. The automatic feeder changes the conveyance speed by the notified adjustment amount. Thereby, the conveyance speed of the automatic feeder is automatically adjusted according to the degree of sliding of the product P, and the product P is arranged at an appropriate position on the placement unit 21.

  As shown in FIG. 45, the weighing and packaging price attaching machine 1 notifies the automatic recognition device of a recognition request that requires the amount of protrusion to be detected, and the automatic recognition device that receives it notifies the weighing and packaging value. The detected amount of protrusion may be notified to the attached machine 1.

  In addition, the weighing and packaging machine 1 stores the obtained adjustment amount of the conveyance speed in the product master file 800, and when this processing is performed on the same product P next time, this adjustment amount is stored in the automatic feeder. You may be notified.

  As a means for detecting the amount of protrusion, a photoelectric sensor, a distance sensor, or the like can be used.

<Modification 6>
When the weighing and packaging pricing machine 1 and the automatic feeder are interlocked as in the above-described modified example 5, the product P is placed around the mounting portion 21 of the weighing and transporting mechanism 2 in the weighing and packaging priceing machine 1. Parts 550 necessary for transporting to the placement unit 21 are arranged. The weight sensor 20 can detect the weight of the product P placed on the placement unit 21, but cannot detect the weight of the product P placed on the component 550.

  On the other hand, for a product P having a special shape, the user may manually place the product P on the placement unit 21 without using an automatic feeder. When supplying the product P from the automatic feeder to the placement unit 21, the weighing operation is rarely performed in a state where the product P is placed across the placement unit 21 and the component 550. When the product P is manually supplied to the placement unit 21, the product P may be placed across the placement unit 21 and the component 550 as shown in FIG. Operations may be performed. In this case, there is a possibility that the mismeasured product P is distributed in the market.

  Therefore, in the weighing and packaging price adding machine 1 according to this modification, before the label issuing device 4 issues the label L, whether or not the product P is placed across the placement unit 21 and the component 550. When the product P is placed across the placement unit 21 and the component 550, an error is notified to the outside using the display unit 5 or the like. Thereby, it can prevent that the goods P mismeasured are distributed to a market. Below, the measurement packaging price attaching machine 1 which concerns on this modification is demonstrated in detail.

  As shown in FIG. 47, the weighing / packing-value attaching machine 1 according to the present modification has a position detection sensor 560 that detects whether or not the product P is located near the boundary between the placement unit 21 and the component 550. Is provided. The position detection sensor 560 is, for example, an optical sensor, and includes a light projecting / receiving device 560a and a reflection plate 560b disposed to face each other. In the position detection sensor 560, whether or not the product P is located in the vicinity of the boundary between the placement unit 21 and the component 550 depending on whether or not the light output from the light projector / receiver 560a is detected by the light projector / receiver 560a. Is detected. The detection result of the position detection sensor 560 is input to the control unit 9. The control unit 9 confirms the detection result of the position detection sensor 560 before causing the label issuing device 4 to issue the label L. When the position detection sensor 560 detects that the product P is located near the boundary between the placement unit 21 and the component 550, the control unit 9 straddles the placement unit 21 and the component 550. The error is notified to the outside, for example, by causing the display unit 5 to display an error.

  As shown in FIG. 48, a camera 570 that images the product P from above may be provided instead of the position detection sensor 560. In this case, the control unit 9 determines whether or not the product P is placed on the placement unit 21 by determining whether or not there is a region P1 protruding from the component 550 in the product P from the imaging data obtained by the camera 570. And whether or not it is placed across the component 550.

  Further, when the product P has a special shape, as shown in FIG. 49, the position detection sensor 560 is used even though the product P is placed across the placement unit 21 and the component 550. 2, it may not be detected that the product P is located near the boundary between the placement unit 21 and the component 550. Further, when the camera 570 is used instead of the position detection sensor 560, as shown in FIG. 50, when the height of the product P is large, the product P is placed across the placement portion 21 and the component 550. In spite of being not placed, the camera 570 may obtain an image in which the product P protrudes to the part 550. Therefore, in this case, although the product P is not actually placed across the placement unit 21 and the component 550, the control unit 9 determines that the product P is placed between the placement unit 21 and the component 550. It may be judged that it is placed across the.

  As described above, since either one of the position detection sensor 560 and the camera 570 may be erroneously detected, the product P straddles the placement portion 21 and the component 550 by using both. It is desirable to determine whether or not it is mounted.

<Modification 7>
The outer shape of vegetables and fruits varies depending on the season, production area, and cutting method. Therefore, when the same product P without tray is always packaged under the same packaging conditions, the packaging finish may vary. Further, there may be a problem that the packaging is loose, the stretch film SF is torn, or the length of the stretch film SF is insufficient.

  Therefore, in the weighing / packaging machine 1 according to this modification, when the tray size (the size of the product P) is registered in the tray master file 801 in association with the tray number, the trayless product related to the tray size is registered. Also register the weight of P. Then, when packaging the non-tray product P, the size of the non-tray product P to be packaged is determined from the ratio between the weight of the non-tray product P detected by the weighing and conveying mechanism 2 and the weight in the tray master file 801. By analogy, change the packaging conditions. Thereby, a packaging condition can be automatically changed according to the dispersion | variation in the shape of the goods P without tray. Therefore, a beautiful packaging state can be realized.

<Modification 8>
As a production line for commodities such as food, there is a production line, an automatic feeding machine, a weighing and packaging price machine, and a metal detector arranged in this order from upstream to downstream. In production lines, devices are generally connected by one or more conveyors. Due to differences in transport speed between conveyors, lack of leveling of conveyor belts, etc., downstream from upstream conveyors. The product posture may become oblique when connecting to the conveyor. In the case where an oblique product is supplied to the above-described weighing and packaging price applicator 1, the product may not be appropriately packaged. In addition, if the label issuing device 4 for issuing a label and sticking to a product is disposed downstream of the weighing and packaging pricing machine 1 without using the label issuing device 4 of the weighing and packaging pricing machine 1, the label When a product that is inclined with respect to the sticking device is supplied, a label sticking failure may occur.

  In order to solve such a problem, it is conceivable to provide product guides (tray guides) on the left and right sides of the conveyor to prevent the product from being inclined. However, in this case, it is necessary to change the distance between the left and right product guides every time the width of the product changes, and the product may be caught by the product guide.

  Therefore, this modification provides a technique that can prevent the posture of a product from being inclined without using a product guide.

  FIG. 51 is a diagram for explaining this modification. As shown in FIG. 51, in this modification, the conveyor 600 is divided into left and right parts, and the conveyance speeds of the left conveyor 600a and the right conveyor 600b can be changed independently. A left detection sensor 610a for detecting the product P conveyed from the upstream conveyor 620 is provided at a predetermined position above the left conveyor 600a. The upstream conveyor 620 is also provided at a predetermined position above the right conveyor 600b. A right detection sensor 610b is provided for detecting the product P conveyed from the vehicle. The detection results of the left detection sensor 610a and the right detection sensor 610b are input to a main control unit that controls the entire production line in an integrated manner. Based on the detection results of the left detection sensor 610a and the right detection sensor 610b, the main control unit detects that the posture of the product P is oblique, and the posture of the product P becomes straight along the left-right direction. In this way, the conveyance speeds of the left conveyor 600a and the right conveyor 600b are adjusted.

  When the posture of the product P is oblique as shown in FIG. 51, there is a time difference in the timing at which the product P is detected between the left detection sensor 610a and the right detection sensor 610b. The time difference value corresponds to the amount of inclination of the product P. Therefore, the main control unit, based on the detection results of the left side detection sensor 610a and the right side detection sensor 610b, in what direction the product P has an attitude (“downward to right” or “downward to left”). You can ask if it is. And when the attitude | position of the goods P is left-lowering as FIG. 51 shows, the main control part makes the conveyance speed of the left conveyor 600a from the conveyance speed of the right conveyor 600b according to the inclination amount. Also make it faster. On the other hand, when the posture of the product P is lowered to the right, the main control unit makes the conveyance speed of the right conveyor 600b faster than the conveyance speed of the left conveyor 600a according to the inclination amount. Thereby, the attitude | position of the goods P becomes straight along the left-right direction, and is conveyed to the downstream apparatus 630.

  By arranging the conveyor 600, the left side detection sensor 610a, and the right side detection sensor 610b as described above upstream of the weighing and packaging pricing machine 1 and the labeling device, it is straight with respect to the weighing and packaging priceing machine 1 and the labeling device. A product P with a proper attitude can be supplied. Therefore, generation | occurrence | production of packaging defect and the sticking defect of a label can be suppressed.

  Note that the conveyor itself of the weighing and packaging price setting machine 1 and the labeling device may be a conveyor 600 as shown in FIG. 51, and the left detection sensor 610 a and the right detection sensor 610 b may be disposed above the conveyor 600.

DESCRIPTION OF SYMBOLS 3 Packaging machine 30 Lift part 32 Film supply part 33 Film cutting part 350 1st holding part 351 2nd holding part FR Film roll P Goods PA Packaging area SF Stretch film

Claims (2)

A packaging machine that wraps the packaging object by pushing up the packaging object against the spread film and covering the packaging object with the film, and then folding the peripheral edge of the film below the packaging object Because
A film supply unit that supplies a film from a film roll to a packaging area in which a packaged object that is a natural product such as vegetables and fruits is not mounted on a tray ,
In a state where the film can be drawn out from the film roll with respect to the packaging area, a lift part that lifts the package and pushes the package against the film in the packaging area;
In the state where the lift part pushes up the packaged object against the film in the packaging area, a cutting part for cutting the film from the film roll ;
A first gripping part for gripping an end of a packaging film that is a film cut from the film roll;
A first motor that moves the first gripper along a direction perpendicular to a direction in which the package is pushed up by the lift;
A folding member that folds the end portion of the packaging film into the lower side of the packaged article;
A second motor having a limited output torque that moves the folding member along the vertical direction;
With
(A) In the packaging film in a state where the article to be packaged is pushed up by the lift part and the end part is grasped by the first grasping part, between the article to be packaged and the first grasping part. A step in which the output torque of the second motor reaches a predetermined limit value by moving in the vertical direction while the folding member abuts against the inclined portion, and the movement of the folding member is stopped;
(B) After the step (a), the first gripping portion moves by a predetermined distance in the vertical direction, the output torque of the second motor decreases, and the folding member moves in the vertical direction. And the process of resuming
Is repeatedly executed, the end of the packaging film is folded under the packaged object,
The said 1st holding part is a packaging machine which releases the holding | grip of the said packaging film, when the distance between the said folding members in the said perpendicular | vertical direction becomes below a predetermined value . The packaging machine according to claim 1,
The drawn out to the packaging area film from the film roll, between the film roll and the packaging area, e Bei the second and third gripping unit grips at a position away from each other,
The cutting unit, a film in a state of being gripped by the second and third gripping unit is cut between the second and third gripping unit, the packaging machine.

Images