WO2017094341A1

WO2017094341A1 - Bag-making packaging machine

Info

Publication number: WO2017094341A1
Application number: PCT/JP2016/079338
Authority: WO
Inventors: 近藤　真史; 市川　誠; 佐藤　良一
Original assignee: 株式会社イシダ
Priority date: 2015-12-02
Filing date: 2016-10-03
Publication date: 2017-06-08
Also published as: JPWO2017094341A1; JP6877040B2

Abstract

The purpose of the present invention is to provide a bag-making packaging machine in which a mechanism for printing accurately on a specified region of a film while the film is being conveyed can be simplified. The bag-making packaging machine (1) is provided with an air shaft (21), a printing device (23), a transverse sealing mechanism (17), and a control unit. The air shaft (21) conveys a sheet-shaped film (F). The printing device (23) prints on a region (R) of the conveyed film (F) that is to be printed. The transverse sealing mechanism (17) seals the seal regions of the film (F), which has been formed in a tubular shape, in the transverse direction. The control unit stops the film (F) at a position at which stopping is possible when conveyance of the film (F) is stopped on the basis of an operation stop request. The position at which stopping is possible is located between an nth (n being a natural number) region (R) to be printed by the printing device (23) and an (n+1)th region (R) to be printed. When restarting operation, the control unit adjusts the timing with which the transverse sealing mechanism (17) seals a seal region and the timing with which the air shaft (21) conveys the wrapping material according to the position at which stopping is possible.

Description

Bag making and packaging machine

The present invention relates to a bag making and packaging machine having a function of printing a manufacturing date on a packaging material while continuously conveying the sheet-shaped packaging material.

Conventionally, a bag making and packaging machine is used in which a bag formed from a film, which is a sheet-like packaging material, is filled with an object to be packaged such as food and sealed. This bag making and packaging machine is formed into a tube shape while conveying a sheet-like film, and seals the overlapping edges of the tube-like film in the vertical direction. Next, this bag making and packaging machine fills the inside of the tubular film with an article to be packaged, and seals the tubular film in the lateral direction. Next, this bag making and packaging machine cuts the laterally sealed portion with a cutter.

Patent Document 1 (Japanese Patent Laid-Open No. 2006-36246) discloses a bag making and packaging machine equipped with a print head. The print head prints the date of manufacture and the content of food to be packaged in a predetermined print area of the film before being formed into a tube shape. This bag making and packaging machine intermittently conveys the film by periodically stopping the conveyance of the film during operation. This bag making and packaging machine performs a printing operation for printing on a film and a lateral sealing operation for sealing the film in the lateral direction while the film transport is temporarily stopped. This bag making and packaging machine conveys the film by the length of one bag after the printing operation and the lateral sealing operation are completed.

Also, a continuous conveyance type bag making and packaging machine equipped with a print head capable of printing on a film while conveying the film is also used. The continuous transport type bag making and packaging machine temporarily transports the film when the package to be filled in the film is exhausted or when there is a request to stop the operation from the measuring instrument of the package. May stop. However, the continuous conveyance type bag making and packaging machine cannot print on a stopped film. Therefore, when the print area of the film is positioned on the print head when the film is stopped, the continuous conveyance type bag making and packaging machine cannot perform printing on the print area, and printing omission occurs. In order to prevent print omission, it is necessary to adjust the position of the film so that the print target area of the film is not located on the print head.

As a mechanism for adjusting the position of the film, Patent Document 1 (Japanese Patent Laid-Open No. 2006-36246) and Patent Document 2 (Japanese Patent Laid-Open No. 6-127533) disclose a bag making and packaging machine that intermittently conveys a film, In order to print accurately on the print area of the film, a mechanism is disclosed that draws the film by a predetermined amount between the print head and the lateral seal mechanism.

However, there are a wide variety of film designs, and the position of the print area varies depending on the type of film. Therefore, in order to prevent printing omission by drawing the film by hand and printing accurately in the printing area, it is necessary to check the printing area for each type of film and set the amount to draw. Further, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2006-36246) and Patent Document 2 (Japanese Patent Laid-Open No. 6-127533), a mechanism for pulling the film is usually made up of a plurality of movable rollers or the like. Since the device is a complicated device, problems such as an increase in the size of the device and an increase in cost occur.

An object of the present invention is to provide a bag making and packaging machine capable of simplifying a mechanism for accurately printing a predetermined area of a film while conveying the film.

The bag making and packaging machine according to the present invention forms a sheet-like packaging material into a cylindrical shape, fills the packaging material with a packaged object, and seals it. The bag making and packaging machine includes a transport unit, a printing unit, a lateral seal unit, and a control unit. A conveyance part conveys a packaging material. The printing unit prints on a printing area of the packaging material conveyed by the conveyance unit. A horizontal seal part seals the sealing area | region of the packaging material shape | molded by the cylinder shape in a horizontal direction. The control unit controls the transport unit. The control unit stops the packaging material at a stoppable position when the conveyance of the packaging material is stopped based on the operation stop request. The stoppable position is located between the nth (n is a natural number) printed area and the (n + 1) th printed area by the printing unit. When the operation is resumed, the control unit adjusts the timing at which the horizontal seal unit seals the seal region and the timing at which the transport unit transports the packaging material according to the stoppable position.

This bag making and packaging machine prints predetermined information on a printing area on the surface of a film while conveying a film which is a sheet-like packaging material. The bag making and packaging machine stops the conveyance of the film based on the operation stop request. The operation stop request is, for example, a control signal for stopping the operation of the bag making and packaging machine. The bag making and packaging machine stops the film at a stoppable position when the operation is stopped so that printing and sealing can be accurately performed when the operation is resumed. Further, the bag making and packaging machine adjusts the film transport start time in order to synchronize the timing of printing and sealing when the operation is resumed. This prevents a print omission due to, for example, stopping the conveyance of the film while the printing area is on the print header when the operation is stopped. Since the bag making and packaging machine controls the film stop position and the conveyance start time by software, a film feeding mechanism or the like is unnecessary. Therefore, the bag making and packaging machine can simplify a mechanism for accurately printing a predetermined area of the film while conveying the film.

Further, the stoppable position is preferably a position where the print area can pass through the printing unit at the first transport speed when the operation is resumed.

This bag making and packaging machine passes the print area on the print header at the first transport speed after restarting operation. The first transport speed is a range of the film transport speed necessary for accurately printing on the print area on the surface of the film being transported. Therefore, the bag making and packaging machine can improve the printing accuracy.

Further, it is preferable that the stoppable position is a position where the seal area can pass through the horizontal seal portion at the second transport speed when the operation is resumed.

This bag making and packaging machine allows the film to pass at the second transport speed in the sealing mechanism after restarting operation. The 2nd conveyance speed is a range of the conveyance speed of a film required in order to seal the film currently conveyed correctly. Therefore, the bag making and packaging machine can improve the accuracy of the seal.

In addition, when the control unit stops the transport of the packaging material based on the operation stop request, the control unit can be stopped by transporting the packaging material by a predetermined transport amount so as to shift the stop position of the packaging material. It is preferable to stop the packaging material at the position. In this case, at the time of restarting the operation, the control unit preferably starts transporting the packaging material after a time necessary for transporting the packaging material by an amount corresponding to the transport amount has elapsed.

This bag making and packaging machine can prevent printing omission by controlling the timing of stopping the conveyance of the film when the operation is stopped and the timing of resuming the conveyance of the film when the operation is resumed.

Moreover, it is preferable that the bag making and packaging machine further includes an input unit for inputting the conveyance amount.

This bag making and packaging machine is equipped with an interface for setting the timing of film transport stop and transport restart. Therefore, the user of the bag making and packaging machine can appropriately set the timing for stopping and resuming the conveyance of the film according to the type of film.

The bag making and packaging machine according to the present invention can simplify a mechanism for accurately printing a predetermined area of a film while conveying the film.

It is a perspective view of the bag making packaging machine which is one embodiment of the present invention. It is a perspective view which shows schematic structure of a bag making packaging unit. It is the schematic side view which looked at the horizontal seal mechanism from the right side of FIG. It is a side view which shows schematic structure of a film supply unit. It is the figure which showed typically the film conveyed with a bag making packaging machine along the up-down direction. FIGS. 5A to 5C are comparative examples for explaining the effect of the present embodiment. The range that the stop possible position can take is shown. It is a side view which shows the schematic structure of the film supply unit provided with the film feeding mechanism as a comparative example.

Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is one specific example of the present invention, and does not limit the technical scope of the present invention.

(1) Structure of bag making packaging machine FIG. 1: is a perspective view of the bag making packaging machine 1 which is one Embodiment of this invention. The bag making and packaging machine 1 is a machine for bagging articles to be packaged such as food. The bag making and packaging machine 1 mainly includes a combination weighing unit 2, a bag making and packaging unit 3, and a film supply unit 4.

The combination weighing unit 2 is arranged above the bag making and packaging unit 3. The combination weighing unit 2 measures the weight of an object to be packaged with a plurality of weighing hoppers, and combines the weight values measured by the respective weighing hoppers so as to be a predetermined total weight. The combination weighing unit 2 discharges the combined objects having a predetermined total weight downward and supplies them to the bag making and packaging unit 3.

The bag making and packaging unit 3 seals and wraps the packaged article in a bag at the timing when the packaged article is supplied from the combination weighing unit 2. The detailed configuration and operation of the bag making and packaging unit 3 will be described later.

The film supply unit 4 is installed adjacent to the bag making and packaging unit 3 and supplies the film formed into a bag to the bag making and packaging unit 3. The film supply unit 4 is set with a film roll around which a film is wound. The film supply unit 4 feeds the film from the film roll. The detailed configuration and operation of the film supply unit 4 will be described later.

The bag making and packaging machine 1 includes an operation switch 5 and a liquid crystal display 6. The operation switch 5 and the liquid crystal display 6 are attached to the front surface of the bag making and packaging machine 1 main body. The liquid crystal display 6 is a touch panel display disposed at a position where the operator of the operation switch 5 can visually recognize. The operation switch 5 and the liquid crystal display 6 function as an input device that receives instructions for the bag making and packaging machine 1 and settings related to the bag making and packaging machine 1. The liquid crystal display 6 functions as an output device that displays information related to the bag making and packaging machine 1.

The bag making and packaging machine 1 includes a control unit (not shown). The control unit is a computer including a CPU, a ROM, a RAM, and the like. The control unit is connected to the combination weighing unit 2, the bag making and packaging unit 3, the film supply unit 4, the operation switch 5, and the liquid crystal display 6. The control unit controls the combination weighing unit 2, the bag making and packaging unit 3, and the film supply unit 4 based on inputs from the operation switch 5 and the liquid crystal display 6, and outputs various information to the liquid crystal display 6.

(2) Configuration of Bag Making and Packaging Unit FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit 3. In the following description, six directions consisting of “front (front)”, “rear (back)”, “up”, “down”, “left” and “right” are defined as shown in FIG. .

The bag making and packaging unit 3 mainly includes a forming mechanism 13, a pull-down belt mechanism 14, a vertical sealing mechanism 15, and a horizontal sealing mechanism 17. The forming mechanism 13 forms the sheet-like film F supplied from the film supply unit 4 into a cylindrical shape. The pull-down belt mechanism 14 conveys the film F formed into a cylindrical shape downward. The vertical sealing mechanism 15 seals the overlapping portion of both end portions of the film F formed into a cylindrical shape in the vertical direction parallel to the transport direction to form the cylindrical film Fc. The horizontal sealing mechanism 17 seals the tubular film Fc in the horizontal direction perpendicular to the transport direction, and forms a bag B in which the upper end and the lower end are horizontally sealed.

(2-1) Forming Mechanism The forming mechanism 13 includes a tube 13a and a former 13b. The tube 13a is a cylindrical member having an open upper end and a lower end. An article C to be packaged supplied from the combination weighing unit 2 is put into the opening at the upper end of the tube 13a. The former 13b is disposed so as to surround the tube 13a. When the film F fed out from the film roll of the film supply unit 4 passes through the gap between the tube 13a and the former 13b, the film F is wound around the tube 13a and formed into a cylindrical shape. The tube 13a and the former 13b can be replaced according to the size of the bag B to be manufactured.

(2-2) Pull-down belt mechanism The pull-down belt mechanism 14 conveys the film F wound around the tube 13a downward while adsorbing it. The pull-down belt mechanism 14 mainly includes a driving roller 14a, a driven roller 14b, and a pair of belts 14c. As shown in FIG. 2, the pair of belts 14 c are arranged so as to sandwich the tube 13 a on both the left and right sides of the tube 13 a and have a mechanism for adsorbing the film F formed in a cylindrical shape. The pull-down belt mechanism 14 conveys the film F formed into a cylindrical shape downward by rotating the pair of belts 14c by the driving roller 14a and the driven roller 14b.

(2-3) Vertical Seal Mechanism The vertical seal mechanism 15 seals the film F formed in a cylindrical shape in the vertical direction (vertical direction in FIG. 2). The vertical seal mechanism 15 is disposed on the front side of the tube 13a. The vertical seal mechanism 15 is moved in the front-rear direction so as to approach the tube 13a or away from the tube 13a by a drive mechanism (not shown).

When the vertical seal mechanism 15 is driven by the drive mechanism so as to approach the tube 13a, the vertical overlapping portion of the film F wound around the tube 13a is sandwiched between the vertical seal mechanism 15 and the tube 13a. The vertical sealing mechanism 15 heats the overlapping portion of the film F in the vertical direction by heating the overlapping portion of the film F against the tube 13a with a constant pressure by the driving mechanism, thereby forming the tubular film Fc. . The vertical sealing mechanism 15 includes a heater that heats the overlapping portion of the film F, a heater belt that contacts the overlapping portion of the film F, and the like.

(2-4) Horizontal Seal Mechanism The horizontal seal mechanism 17 seals the tubular film Fc in the horizontal direction (left and right direction in FIG. 2). The horizontal sealing mechanism 17 is disposed below the forming mechanism 13, the pull-down belt mechanism 14, and the vertical sealing mechanism 15.

FIG. 3 is a schematic side view of the lateral seal mechanism 17 as viewed from the right side of FIG. In FIG. 3, the direction perpendicular to the paper surface is the left-right direction in FIG. The horizontal seal mechanism 17 mainly includes a first rotating body 50a and a second rotating body 50b. The 1st rotary body 50a is arrange | positioned at the front side of the cylindrical film Fc. The second rotating body 50b is disposed on the rear side of the tubular film Fc. 3, the first rotating body 50a is located on the left side of the tubular film Fc, and the second rotating body 50b is located on the right side of the tubular film Fc.

The first rotating body 50a mainly includes a first rotating shaft 53a, a first sealing jaw 51a, and a second sealing jaw 52a. The second rotating body 50b mainly includes a second rotating shaft 53b, a first sealing jaw 51b, and a second sealing jaw 52b. When viewed along the left-right direction, the first rotating body 50a rotates around the rotation center C1 of the first rotating shaft 53a with the first rotating shaft 53a as a rotating shaft. When viewed along the left-right direction, the second rotating body 50b rotates around the rotation center C2 of the second rotating shaft 53b with the second rotating shaft 53b as a rotating shaft. When the horizontal seal mechanism 17 is viewed along the left-right direction, the pair of

first seal jaws

51a, 51b rotate synchronously in opposite directions, and the pair of

second seal jaws

52a, 52b synchronize in opposite directions. Rotate. In FIG. 3, the trajectories of the pair of

first seal jaws

51a and 51b and the pair of

second seal jaws

52a and 52b are indicated by chain lines.

The lateral seal mechanism 17 intersects the transport direction of the tubular film Fc with the tubular film Fc transported downward by the pair of

first seal jaws

51a and 51b or the pair of

second seal jaws

52a and 52b. It is sandwiched along the horizontal direction (left and right direction in FIG. 2). The pair of

first sealing jaws

51a and 51b or the pair of

second sealing jaws

52a and 52b heats the tubular film Fc in the lateral direction by heating while sandwiching the tubular film Fc.

(3) Configuration of Film Supply Unit FIG. 4 is a side view showing a schematic configuration of the film supply unit 4. 4, the sheet-like film F is conveyed from the right side (upstream side) to the left side (downstream side). The film supply unit 4 feeds the film F from the film roll FR, prints predetermined information on the surface of the film F while conveying the film F, and supplies the film F to the forming mechanism 13 of the bag making and packaging unit 3. . The film supply unit 4 mainly includes an air shaft 21, a plurality of tension rollers 22, a printing device 23, an inspection device 24, and a feed roller 25.

(3-1) Air Shaft The air shaft 21 is a shaft on which a film roll FR around which a sheet-like film F is wound is set. The air shaft 21 fixes the film roll FR by vacuum suction. The air shaft 21 is rotationally driven by a shaft drive motor (not shown). When the shaft drive motor rotates the air shaft 21, the sheet-like film F wound around the film roll FR is fed out.

The film F fed from the film roll FR in the film supply unit 4 is finally sent to the bag making and packaging unit 3. In the bag making and packaging unit 3, the film F is formed into a cylindrical shape by the forming mechanism 13 and conveyed downward by the pull-down belt mechanism 14. Thereby, in the film supply unit 4, the film F fed out from the film roll FR is conveyed by the amount fed out. The control unit can adjust the conveyance speed of the film F fed from the film roll FR by controlling the shaft drive motor to change the rotation speed of the air shaft 21.

(3-2) Tension roller The tension roller 22 is a roller disposed at a predetermined position at a predetermined distance. The tension roller 22 guides the film F to the printing device 23 while bending the film F fed from the film roll FR and changing the transport angle. The tension roller 22 applies an appropriate tension to the film F that is fed from the film roll FR and conveyed, and prevents the film F being conveyed from loosening and meandering. The number and position of the tension rollers 22 can be arbitrarily set according to the position of the film roll FR, the dimension of the film F, and the like.

At least a part of the tension roller 22 may be movable in the vertical direction. The tension applied to the film F guided by the tension roller 22 can be adjusted by moving the tension roller 22. In this case, the control unit detects the tension state of the film F based on the amount of vertical displacement of the tension roller 22. And a control part controls a shaft drive motor based on the detected tension state, and adjusts the conveyance speed of the film F so that the tension concerning the film F may become in the predetermined range.

(3-3) Printing Device The printing device 23 mainly includes a print head 23a and a print roller 23b. The print head 23a prints predetermined print information on the surface of the film F being conveyed. The print information is printed on a predetermined print area on the surface of the film F. The printed information is, for example, the date of manufacture and the expiration date of the packaged article C when the packaged article C is food. The printing information is transmitted from the control unit to the printing device 23. The print head 23a is movable so as to be pressed against the film F or away from the film F. However, the print head 23a is not movable along the transport direction of the film F.

The printing roller 23b is a roller disposed to face the printing head 23a. The conveyed film F passes between the print head 23a and the print roller 23b. The print roller 23b finely adjusts the position of the film F so that the print head 23a faces the surface of the film F. As a result, the print head 23a can print the print information so as to be within the print area of the film F being conveyed.

(3-4) Inspection Device The inspection device 24 is installed near the downstream side of the printing device 23. The inspection device 24 inspects whether or not the print information is accurately printed in the print area of the film F. The inspection device 24 is an optical sensor composed of a light emitting element and a light receiving element. The film F to be conveyed passes between the light emitting element and the light receiving element. The light emitting element irradiates light on the print area of the film F. The light receiving element detects light reflected from the print area and detects the position of the print information printed on the print area.

Note that the inspection device 24 may be an optical camera. In this case, the inspection device 24 inspects whether or not the print information is accurately printed in the print area by analyzing the image acquired by imaging the print area of the film F being conveyed.

(3-5) Feed roller The feed roller 25 is a roller for guiding the film F conveyed in the film supply unit 4 in a predetermined direction. The film supply unit 4 shown in FIG. 4 includes one feed roller 25. The feed roller 25 is disposed between the tension roller 22 and the printing device 23 and guides the film F in the direction in which the printing device 23 is located. The number and position of the feed rollers 25 can be arbitrarily set according to the configuration of the film supply unit 4 and the like. The film supply unit 4 may not include the feed roller 25 depending on the configuration.

(4) Operation of Bag Making and Packaging Machine (4-1) Overall Operation First, an outline of the operation of the bag making and packaging machine 1 for sealing the article to be packaged C in the bag B will be described. The film F supplied from the film supply unit 4 to the bag making and packaging unit 3 is wound around the tube 13 a and formed into a cylindrical shape, and is conveyed downward by the pull-down belt mechanism 14. The cylindrical film F wound around the tube 13a is overlapped at both ends extending in the vertical direction. The overlapping portion of the film F formed into a cylindrical shape is sealed in the vertical direction by the vertical sealing mechanism 15 to form a cylindrical film Fc.

The vertically sealed cylindrical film Fc is removed from the tube 13a and conveyed downward to the horizontal sealing mechanism 17. The horizontal sealing mechanism 17 performs horizontal sealing by sandwiching the tubular film Fc between the pair of

first sealing jaws

51a and 51b or the pair of

second sealing jaws

52a and 52b. At this time, a bag B in which an article to be packaged C is enclosed is formed below the laterally sealed portion of the tubular film Fc. On the other hand, above the side-sealed portion of the tubular film Fc, the article to be packaged C weighed by the combination weighing unit 2 falls in the tube 13a and is put into the tubular film Fc.

Further, in accordance with the timing at which the cylindrical film Fc is laterally sealed, a portion of the cylindrical film Fc that has been laterally sealed by a cutter (not shown) built in the first sealing jaw 51a or the second sealing jaw 52a. Is cut laterally. Thereby, the bag B in which the article to be packaged C is enclosed is separated from the subsequent cylindrical film Fc.

As described above, the bag B in which the article to be packaged C is enclosed is manufactured continuously. The manufactured bag B is then transferred to devices such as a thickness checker and a weight checker by a belt conveyor (not shown) or the like.

(4-2) Detailed Operation of Film Supply Unit Next, details of the operation of the film supply unit 4 supplying the film F to the bag making and packaging unit 3 will be described. The film supply unit 4 feeds the film F from the film roll FR fixed to the air shaft 21 and supplies the film F to the forming mechanism 13. First, the film supply unit 4 conveys the film F fed from the film roll FR while being guided by the tension roller 22. Next, the film supply unit 4 prints print information on a print area of the film F by the printing device 23 while conveying the film F whose direction has been changed by the feed roller 25. Next, the film supply unit 4 inspects whether or not the print information is accurately printed in the print area of the film F by the inspection device 24. Next, the film supply unit 4 sends the film F to the forming mechanism 13 of the bag making and packaging unit 3.

The control unit of the bag making and packaging machine 1 stops the operation based on the operation stop request. The operation stop request is, for example, when the inspection device 24 determines that the printing information is not accurately printed on the printing area R of the film F, or when there is no package C to be weighed by the combination weighing unit 2. When the user of the bag making and packaging machine 1 presses the operation stop button of the bag making and packaging machine 1, the signal is transmitted to the control unit. Further, the control unit of the bag making and packaging machine 1 restarts the operation based on the operation resumption request when the bag making and packaging machine 1 is stopped. For example, when the bag making and packaging machine 1 has stopped operating because the printing information is not accurately printed on the printing area R of the film F, the printing information is accurately displayed on the printing area R. This is a signal transmitted to the control unit when the position of the film F is adjusted so as to be printed and the user of the bag making and packaging machine 1 presses the operation start button of the bag making and packaging machine 1.

When receiving the operation stop request signal, the control unit controls the combination weighing unit 2, the bag making and packaging unit 3, and the film supply unit 4 to stop the operation of the bag making and packaging machine 1. Specifically, the control unit appropriately performs the weighing operation of the article C to be packaged by the combination weighing unit 2, the packaging operation of the article C to be packaged by the bag making and packaging unit 3, and the supply operation of the film F by the film supply unit 4. Stop at the right time.

Thereafter, when the control unit receives the operation resumption request signal, the control unit controls the combination weighing unit 2, the bag making and packaging unit 3, and the film supply unit 4 to start the operation of the bag making and packaging machine 1. Specifically, the control unit appropriately performs the weighing operation of the article C to be packaged by the combination weighing unit 2, the packaging operation of the article C to be packaged by the bag making and packaging unit 3, and the supply operation of the film F by the film supply unit 4. Restart at the right time.

The control unit stops the conveyance of the film F at a stoppable position when the supply operation of the film F by the film supply unit 4 is stopped based on the operation stop request. The stoppable position is a stop position of the film F so that the printing device 23 can accurately print the print information on the print area R when the bag making and packaging machine 1 is restarted. The stoppable position is located between the printing area R printed nth (n is a natural number) by the printing device 23 and the printing area R printed n + 1th by the printing device 23.

Next, stop possible positions will be described with reference to the drawings. FIG. 5 is a diagram schematically showing the film F conveyed by the bag making and packaging machine 1 along the vertical direction. In FIG. 5, the conveying direction of the film F is a direction from the top to the bottom of the page. In FIG. 5, the conveyance direction of the film F is indicated by a downward arrow. FIG. 5 shows a film F in which unit regions X corresponding to one bag B are connected. A boundary between adjacent unit regions X is indicated by a dotted line. In each unit area X, a print area R is shown. The print area R in which the print information has not yet been printed is indicated by a white ellipse, and the print area R in which the print information has already been printed is indicated by a black ellipse. FIG. 5 shows the print position P1 and the horizontal seal position P2. The printing position P1 is a position where the printing device 23 of the film supply unit 4 prints on the film F. The lateral seal position P2 is a position where the lateral seal mechanism 17 of the bag making and packaging unit 3 laterally seals the film F. In FIG. 5, the boundary between adjacent unit regions X is a position where the horizontal sealing mechanism 17 can normally perform horizontal sealing. The film F is formed in the bag B on the downstream side from the lateral seal position P2. FIG. 5 shows a plurality of patterns having different positions of the film F as FIGS. 5A to 5C are comparative examples for explaining the effect of the present embodiment.

As described above, the printing device 23 prints the printing information on the film F being conveyed. Since the print head 23a of the printing device 23 is not movable along the conveyance direction of the film F, the printing device 23 cannot print the printing information on the film F that is stopped. In addition, in order for the printing device 23 to accurately print on the print area R of the film F, the transport speed of the film F needs to be within a predetermined range. For example, when the conveyance speed of the film F is not sufficient, the printing device 23 cannot accurately print on the print area R of the film F. Hereinafter, the range of the conveyance speed of the film F necessary for the printing device 23 to accurately print on the print area R of the film F is referred to as a first conveyance speed. In other words, in order for the print area Ra to be printed accurately, the speed of the film F when the print area Ra passes the print position P1 needs to reach the first transport speed.

FIG. 5A shows a state in which the film F is stopped in a state where the control unit receives the operation stop request signal and a certain print area Ra overlaps the print position P1. In the print area Ra, print information is not printed at all by the printing device 23, or only a part of the print information is printed. In this case, when the operation is resumed, the printing device 23 at the printing position P1 cannot accurately print the printing information on the printing area Ra. This is because the speed of the film F when the print area Ra passes the print position P1 after restarting the operation does not reach the first transport speed.

FIG. 5B shows a state in which the control unit receives the operation stop request signal and the film F is stopped in a state where the printing position P1 is located in the vicinity of the downstream side of a certain printing area Rb. . In this print area Rb, no print information is printed by the printing device 23. In this case, when the operation is resumed, the printing device 23 at the printing position P1 cannot accurately print the printing information on the printing area Rb. This is because the speed of the film F when the print area Rb passes the print position P1 after restarting operation does not reach the first transport speed.

FIG. 5C shows a state in which the film F is stopped in a state where the control unit receives the operation stop request signal and the printing position P1 is located in the vicinity of the upstream side of a certain printing area Rc1. . In this print area Rc1, print information is printed by the printer 23. Printing information is not printed by the printing device 23 in the printing area Rc2 adjacent to the printing area Rc1 on the upstream side. In this case, when the operation is resumed, the printing device 23 at the printing position P1 can accurately print the printing information on the printing area Rc2. This is because the speed of the film F when the print area Rc2 passes the print position P1 after the restart of operation reaches the first transport speed.

As shown in FIGS. 5A and 5B, when the control unit receives the operation stop request signal, the film F when the print area R passes through the print position P1 for the first time after the operation is resumed. When the film F stops at a position where the speed does not reach the first transport speed, the printing device 23 cannot accurately print the print information on the print area R. On the other hand, as shown in FIG. 5C, when the control unit receives the operation stop request signal, the speed of the film F when the print area R passes through the print position P1 for the first time after restarting operation is the first. When the film F stops at a position that reaches one transport speed, the printing device 23 can accurately print the print information on the print area Rb. The stoppable position described above is a stop position of the film F as shown in FIG. That is, the stoppable position is a position where the speed of the film F reaches the first transport speed when the print area R passes through the print position P1 for the first time after restarting operation.

The stoppable position can take a predetermined range. FIG. 6 shows a possible range of the stoppable position. FIG. 6 schematically shows the film F along the vertical direction, as in FIG. In FIG. 6, the conveyance direction of the film F is indicated by a downward arrow. In FIG. 6, the hatched printable area RP is a range that the print position P1 can take when the film F stops at the stoppable position. That is, when the control unit receives the operation stop request signal and the conveyance of the film F stops, the film F is in the stoppable position when the print position P1 is in the printable region RP.

The most downstream position of the printable area RP is the same as the most upstream position of the print area R. The dimension RL of the printable region RP in the transport direction of the film F depends on the acceleration of the film F after the operation is resumed. The greater the acceleration of the film F after the restart of the operation, the shorter the time until the speed of the film F reaches the first transport speed when the print area R passes the print position P1 for the first time after the restart of the operation. Therefore, the larger the acceleration of the film F after resuming operation, the longer the dimension RL of the printable region RP. The longer the dimension RL of the printable area RP, the shorter the distance between the printable area RP and the closest print area R on the upstream side.

In the present embodiment, when the control unit of the bag making and packaging machine 1 receives the operation stop request signal, the position of the print head 23a of the printing device 23 does not overlap the print target region R of the film F after the stop. In addition, the stop position of the film F is automatically adjusted. Specifically, the control unit surpasses the film F by a predetermined film conveyance amount as necessary so that the print head 23a (printing position P1) fits in the printable region RP shown in FIG. And the stop position of the film F is shifted. This prevents the film F from stopping at a position as shown in FIGS. 5A and 5B when the control unit receives an operation stop request signal. Thereby, the bag making and packaging machine 1 can prevent the occurrence of printing omission in which the printing information is not normally printed on the printing area R of the film F after the restart of operation.

Note that the control unit of the bag making and packaging machine 1 needs to receive the operation stop request signal and shift the stop position of the film F, and the print position P1 (position of the print head 23a) is in the printable region RP. If not, it is preferable to shift the stop position of the film F so that the print position P1 is positioned at the stoptable position P3 shown in FIG. The stoppable position P3 is a position on the most downstream side of the printable area RP closest to the upstream side of the print position P1 that is the current position of the print head 23a. In this case, the amount by which the control unit shifts the stop position of the film F is the smallest. FIG. 6 shows the film transport amount FS when the position of the film F is shifted to the stoppable position P3.

Further, the control unit of the bag making and packaging machine 1 is configured such that when the operation of the bag making and packaging machine 1 is resumed, the timing at which the lateral seal mechanism 17 laterally seals the film F according to the position of the film F, and the film supply unit 4 The timing for starting the conveyance of the film F is adjusted. Specifically, when the operation of the bag making and packaging machine 1 is resumed, the control unit, after the time necessary for transporting the film F by an amount corresponding to the film transport amount at the time of the operation stop, Start conveyance. For example, when the control unit receives an operation stop request signal, it is assumed that the film F is transported by an extra 50 mm than usual and the stop position of the film F is shifted. Here, the above-mentioned film conveyance amount is 50 mm. In this case, when the operation of the bag making and packaging machine 1 is resumed, the control unit waits for the time required for the film F to be conveyed by 50 mm from the stopped state, and then resumes the conveyance of the film F.

(5) Features The bag making and packaging machine 1 starts the conveyance of the film F when the control unit receives the stop position of the film F when the control unit receives the operation stop request signal and the operation restart request signal. The time is controlled by software to prevent missing prints. Therefore, the bag making and packaging machine 1 does not require a special mechanism for preventing printing loss. Such a mechanism is, for example, a hand feeding mechanism for the film F. FIG. 7 is a side view showing a schematic configuration of a film supply unit including a film feeding mechanism as a comparative example. FIG. 7 shows a configuration in which the hand feeding mechanism 30 is attached to the film supply unit 4 shown in FIG. As shown in FIG. 7, the hand-feeding mechanism 30 is usually a complex device including a plurality of rollers 31 including at least a movable roller 31a. In FIG. 7, the stop position of the film F is adjusted by moving the movable roller 31 a up and down to draw the film F by hand. However, the design of the film F is diverse, and the position of the print area R differs for each type of film F. Therefore, when the hand feeding mechanism 30 is used, it is necessary to confirm the print area R for each type of film F and set the position of the movable roller 31a and the amount of hand feeding. Thereby, when attaching the hand feeding mechanism 30 to a film supply unit, problems such as an increase in the size of the bag making and packaging machine 1 and an increase in cost occur. On the other hand, the bag making and packaging machine 1 according to the present embodiment does not require the hand feeding mechanism 30 as shown in FIG. Therefore, the bag making and packaging machine 1 can simplify the film supply unit 4 that is a mechanism for accurately printing the printing information on the printing area R of the film F while conveying the film F.

Further, when the control unit of the bag making and packaging machine 1 shifts the stop position of the film F by a predetermined film transport amount when the operation is stopped, the control unit of the bag making packaging machine 1 starts the transport of the film F for a time corresponding to the film transport amount when the operation is resumed. Delay. When the control unit shifts the stop position of the film F when the operation is stopped, the film F is transported more than usual by the film transport amount even when the operation is resumed. In this case, in order for the lateral sealing mechanism 17 to normally laterally seal the film F when the operation is resumed, it is necessary to send out the film F as short as the film conveyance amount corresponding to the amount of displacement of the film F. When this processing is not performed, that is, when the conveyance of the film F is started immediately upon resumption of operation, the film F may be laterally sealed at an incorrect position (a position other than the boundary of the adjacent unit regions X in FIG. 5). There is. In order to prevent the occurrence of this problem, the control unit of the bag making and packaging machine 1 appropriately controls the timing of resuming the conveyance of the film F when the operation is resumed.

(6) Modifications One embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

(6-1) Modification A
In the embodiment, when the control unit of the bag making and packaging machine 1 receives the operation stop request signal, the speed of the film F when the print area R passes through the print position P1 for the first time after restarting the operation is the first transport. The stop position of the film F is automatically adjusted so that the speed is reached.

However, when the control unit further receives the operation stop request signal, the speed of the film F when the position of the boundary between the adjacent unit regions X passes the seal position P2 for the first time after restarting the operation is predetermined. The stop position of the film F may be automatically adjusted so as to reach the second transport speed. The sealing position P <b> 2 is a position where the film F formed into a cylindrical shape is laterally sealed by the lateral sealing mechanism 17. As described above, the position of the boundary between the adjacent unit regions X is a position where the lateral seal mechanism 17 can normally laterally seal the film F.

The lateral seal mechanism 17 laterally seals the tubular film Fc conveyed downward by sandwiching the tubular film Fc between the pair of

first seal jaws

51a and 51b or the pair of

second seal jaws

52a and 52b. . The pair of seal jaws rotate synchronously in opposite directions to sandwich the tubular film Fc from above. For this reason, the lateral seal mechanism 17 cannot accurately laterally seal the tubular film Fc that is not conveyed downward and the tubular film Fc that is not sufficiently conveyed. Therefore, in order for the lateral sealing mechanism 17 to laterally seal the tubular film Fc, the transport speed of the film F transported by the film supply unit 4 needs to be within a predetermined range. The second transport speed is a range of the transport speed of the film F that is necessary for the lateral seal mechanism 17 to laterally seal the tubular film Fc accurately.

Therefore, in the bag making and packaging machine 1 of the present modified example, the control unit performs the above-described control, so that the horizontal seal mechanism 17 accurately laterally seals the tubular film Fc after the restart of operation, thereby improving the accuracy of the lateral seal. Can be improved.

(6-2) Modification B
In the embodiment, when the control unit of the bag making and packaging machine 1 receives the operation stop request signal, the speed of the film F when the print area R passes through the print position P1 for the first time after restarting the operation is the first transport. The stop position of the film F is automatically adjusted so that the speed is reached. Specifically, the control unit transports the film F by a predetermined film transport amount more than usual so that the print head 23a (print position P1) fits in the printable region RP shown in FIG. Shift the stop position of film F.

However, the bag making and packaging machine 1 may further include an input unit for inputting the film conveyance amount. The input unit is, for example, the operation switch 5 and the liquid crystal display 6. The user of the bag making and packaging machine 1 can set the conveyance stop and resumption timing of the film F conveyed by the film supply unit 4 by inputting the film conveyance amount using the input unit. The timing of stopping and resuming the conveyance of the film F varies depending on the type of the film F and the position of the print area R. Accordingly, the user of the bag making and packaging machine 1 can appropriately set the conveyance stop and resumption timings of the film F according to the type of the film F and the position of the printing area R.

1 Bag making and packaging machine 5 Operation switch (input unit)
6 Liquid crystal display (input unit)
13 Forming mechanism 14 Pull-down belt mechanism 15 Vertical sealing mechanism 17 Horizontal sealing mechanism (horizontal sealing part)
21 Air shaft (conveying section)
23 Printing device (printing unit)
24 Inspection Equipment B Bag C Packaged Goods F Film (Packaging Material)
Fc Cylindrical film (tubular packaging)
R Print area

JP 2006-36246 A JP-A-6-127533

Claims

A bag making and packaging machine for forming a sheet-like packaging material into a cylindrical shape, filling the packaging material with a packaged object, and sealing the packaging material,
A transport unit for transporting the packaging material;
A printing unit that prints on a printing area of the packaging material conveyed by the conveyance unit;
A lateral seal portion for laterally sealing the sealing region of the packaging material formed into a cylindrical shape;
A control unit for controlling the transport unit;
With
The controller is
When the conveyance of the packaging material is stopped based on an operation stop request, the printing area printed on the nth (n is a natural number) by the printing unit and the printing area printed n + 1 The packaging material is stopped at a stoppable position located between
At the time of restarting the operation, according to the stoppable position, the timing at which the lateral seal portion seals the seal region and the timing at which the transport portion transports the packaging material are adjusted.
Bag making and packaging machine.
The stoppable position is a position where the printing area can pass through the printing unit at a first transport speed when the operation is resumed.
The bag making and packaging machine according to claim 1.
The stoppable position is a position where the seal area can pass through the lateral seal portion at a second transport speed when the operation is resumed.
The bag making and packaging machine according to claim 1 or 2.
The controller is
When stopping the packaging material based on the operation stop request, the packaging material is transported by a predetermined conveyance amount so as to shift the packaging material stop position, and then stopped. To stop the packaging material,
At the time of restarting the operation, after the time necessary for transporting the packaging material by an amount corresponding to the transport amount has elapsed, the transport of the packaging material is started.
The bag making and packaging machine according to any one of claims 1 to 3.
An input unit for inputting the transport amount;
The bag making and packaging machine according to claim 4.