JP2009040486A - Packaging bag supporting apparatus in bag-packing/packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means which does not expand the depth of wrinkles being generated on a packaging bag by vacuum suction in an apparatus which transports the packaging bag being suction-supported by both of first and second suction bars along a circular track. <P>SOLUTION: A pressure controlling valve 40 is arranged in a connecting pipe 48 which connects both of first and second suction bars 21 and 22, and a vacuum pump on the end of a hose 53 of a stationary board 20. In this case, the first and second suction bars 21 and 22 are integrally rotated with a base board 15 which is fixed to a movable board 10 constituting a rotary valve 30. The pressure controlling valve 40 separates a truncated conical valve from the valve seat by compressing a tensile coil spring by a first screw which is arranged on the same axis line. In the meantime, a second screw narrows the orifice opening degree by making the truncated conical valve approach the valve seat while resisting the spring pressure, and the rise of a vacuum value more than a necessary value in both of the first and second suction bars 21 and 22 is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wrapping bag support device for adsorbing and suspending a wrapping bag that accommodates an object to be packaged by a vacuum suction force in a rotary bagging and packaging machine.

  As shown in the following Patent Document 1, a general rotary type bag filling and packaging machine has two pairs of laundry scissors clampers arranged at equal intervals on the periphery of a circular rotor, and the circular rotor The two clamps that rotate together as one set are transported by holding each side edge of the wrapping bag with each clamper, and the first section in the transport track narrows the set of crumbs and opens the wrapping bag opening surface. After opening the enveloping bag by separating the pair of vacuum cups to be adsorbed, the package is filled in the enveloping bag opened as described above in the second section. There is a pinching error when a flat bag is pinched by a pair of laundry scissors type clampers, and there is a problem that the speed increases as the operation speed of the packaging machine is increased.

  On the other hand, the rotary type bag-packing and packaging machine disclosed in Patent Document 2 below has a large number of vacuum suction bars, one pair of which are arranged at equal intervals on the periphery of the circular rotor, and is integrated with the circular rotor. Each pair of rotating vacuum suction bars conveys and supports both sides of the wrapping bag, and is supplied from the outside between the pair of vacuum suction bars in the first section, that is, the bag feeding section, in this transport track. The opening edge of the wrapping bag is supported by the pair of vacuum suction bars and is opened by the approach and separation of the pair of vacuum suction bars. The pair of vacuum suction bars absorbs the wide surface of the wrapping bag. The packaging machine is characterized in that there are fewer support errors of the packaging bag compared to the packaging machine disclosed in Patent Document 1.

  However, in a packaging machine using such a vacuum suction bar, there is a problem that the supporting force of the packaging bag by the vacuum suction bar becomes weaker as the film constituting the packaging bag is thinner. In other words, the force that the vacuum suction hole supports the wrapping bag is caused by the pressure difference between the atmosphere acting on both sides of the film and the vacuum, but when observed microscopically, the wrapping bag adsorbed to the vacuum suction hole by the pressure difference is Because of this pressure difference, countless wrinkles are generated on the film, and the bag is supported while sucking air from the wrinkles. The depth of the wrinkles becomes more conspicuous as the thickness of the film becomes thinner, and there is a concern that the wrapping of the wrapping bag from the vacuum suction bar and dropping off as the operating speed of the apparatus increases.

Japanese Utility Model Publication No. 04-60811 Japanese Patent Laid-Open No. 60-2413

In order to solve the above-mentioned problems, the present invention provides a plurality of substrates equidistantly spaced on a peripheral surface of a movable plate rotating in contact with a fixed plate arranged on a machine base so as to rotate integrally with the movable plate. The first suction bar that is horizontally long is fixed to the outer surface of each base, and a second suction bar that approaches and separates from the first suction bar is provided, and is configured by the fixed plate and the movable plate. The vacuum suction force processed by the rotary valve is applied to the respective vacuum ports on the opposing surfaces of the first and second suction bars through a vacuum suction connecting pipe that connects one end to the movable plate. A rotary bagging and packaging device that operates at intervals is equipped with the following devices.
That is, the pressure regulating valve provided in the rotary bagging and packaging device has a primary chamber on the pump suction side across the valve seat inside the valve box, and a secondary on the first and second suction bars side across the valve box. A tension coil spring disposed in the primary chamber and a truncated conical valve disposed in the secondary chamber in a state of opening and closing the valve seat, and adjusting the compression amount of the tension coil spring A first screw and a second screw for adjusting the opening degree of the orifice by the truncated conical valve in the valve seat are respectively provided in the valve box.

Since the generation of wrinkles at the vacuum suction hole is physically necessary in a thin bag, the first screw should be used to prevent the truncated cone valve from completely closing the valve seat with a slight air leak. Therefore, the tension coil spring is compressed to increase the spring pressure. On the other hand, the second screw makes the truncated conical valve approach the valve seat against the spring pressure and narrows the orifice opening.
After all, by narrowing the orifice opening and suppressing the increase in the vacuum value beyond the required value in the secondary chamber, the depth of the bag in the packing bag adsorbed in the vacuum suction hole is not increased, but the packing bag is dropped. When the vacuum suction hole is opened, the truncated cone valve immediately adheres to the valve seat against the pressure of the tension coil spring so that atmospheric pressure does not act on the other first and second suction bars. Note that the above-described adjustment using both screws is performed in accordance with the thickness of the film constituting the package and the weight of the package related to the thickness.

  A vertical bearing 12 supported on a machine base 11 as shown in FIG. 1 supports a cylindrical main shaft 13 that horizontally fixes a circular movable plate 10 at the upper end, and the movable plate as shown in FIG. 10 supports the base 15 vertically on the peripheral surface via a bracket 14. Although not shown, at least six bases 15 are arranged at equal intervals on the peripheral surface of the movable platen 10, and the movable platen 10 is input by an input from a gear 16 fixed to the lower end of the main shaft 13. In this configuration, the bases 15 rotate intermittently at the same pitch as the arrangement interval of the bases 15.

  Further, a mandrel 18 standing at the main shaft 13 with its lower end fixed to the machine base 11 supports a circular stationary platen 20 forming a rotary valve 30 with the movable platen 10 at its upper end. The movable plate 10 slides and rotates on the lower surface of the fixed plate 20.

  Furthermore, the board | substrate 15 fixes the 1st suction bar 21 horizontally long on the outer side, and arrange | positions the 2nd suction bar 22 so that this 1st suction bar may be opposed. As shown in FIG. 3 which is enlarged and illustrated, both the first and second suction bars 21 and 22 are hollow inside, and a plurality of vacuum cups 29 made of rubber installed on the respective opposing surfaces are interposed between them. On the other hand, the fixing sleeve 23 provided on the base 15 is provided with a pressure control valve 40 on the lower side through a chamber 28 formed therein (see FIG. 4). .

  The chamber 28 and the first suction bar 21 form a vacuum suction passage through a short tube 24, and a pipe-shaped rod-shaped guide 25 that supports the second suction bar 22 is slidable on the fixed sleeve 23. And a vacuum suction passage is formed through the window hole 26 on the side surface of the rod-shaped guide 25.

  In the valve box 41 of the pressure control valve 40 in FIG. 4, a truncated conical valve 43 is opposed to a valve seat 42 formed inside, and an orifice 44 is formed therebetween. A primary chamber 45 is formed on the side of the vacuum pump in the orifice, and a secondary chamber 46 is formed on the side of the first and second suction bars 21 and 22 already described. The compression coil spring 58 disposed in the primary chamber 45 faces the truncated conical valve 43 on the same axis, and the first screw 59 and the second screw 60 provided so as to penetrate the valve box on the same axis It is a member that adjusts the degree of compression of the coil spring 58 and the opening of the orifice 44.

  The first screw 59 contracts the compression coil spring 58 to stabilize the movement of the truncated cone valve 43, and the second screw 60 increases the differential pressure between the primary chamber 45 and the secondary chamber 46 and deepens the bag. As described above, the connection port 47 at the end of the primary chamber 45 is routed from the opening 56 formed in the movable platen 10 via the connecting pipe 48 in FIG. 49, the passage 49 opens on the upper surface of the movable platen 10 with a switching port 50. On the other hand, the upper end portion of the secondary chamber 46 is fixed to the fixing sleeve 23 already described with a screw groove.

  FIG. 6 is a plan view of the rotary valve 30 constituted by the movable platen 10 and the fixed platen 20 already described. The lower surface of the fixed platen 20 shown in FIG. An arc-shaped groove 52 is formed along a circle, and the vacuum suction force of the pump acts in the groove 52 through a hose 53 at one end thereof (see FIG. 5).

  On the other hand, eight switching ports 50 are opened along the circle drawn at the center of the movable plate 10 shown in FIG. 8 as the number of sets of the suction bars 21 and 22 in FIG. Only while the switching ports 50 that rotate in the direction of the arrow 55 integrally with the movable platen 10 that rotates intermittently are positioned in the arc-shaped groove 52, the switching ports 50 receive vacuum from the hose 53. A suction force will act.

  In FIG. 8, each of the switching ports 50 has an opening 56 on the upper surface through a hidden passage 49 pierced from the lateral direction. This opening 56 is, as already described, connected to the connection pipe 48 of FIG. It connects with the pressure control valve 40 of FIG.

  In FIG. 6, the pressure control valve 40 is illustrated as if it is directly mounted on the movable platen 10, but this figure is an outline for easy understanding of the connection between the pressure control valve 40 and the switching port 50. In FIG. 4, the vacuum suction force acting on the primary chamber 45 passes through the orifice 44, passes through the window hole 26 on the side surface of the rod-shaped guide 25 from the secondary chamber 46, the first and second suction bars 21 at the tip of the rod-shaped guide 25, 22 acts.

  The groove guide 65 on the upper surface of the fixed platen 20 in FIGS. 1 and 2 has a cloud shape in plan view, and the pulley 67 installed at the end of the arm 66 fixed to the rod-shaped guide 25 engages with the cloud-shaped groove guide 65. To do. On the other hand, in the bag supply section 80 for supplying the packaging bag 70 from the outside between the first and second suction bars 21 and 22, the movable groove guide 71 that is separated from the groove guide 65 and independent is provided with the actuator 72. Therefore, when the pulley 67 moving integrally with the first and second suction bars 21 and 22 reaches the movable guide 71, the movable guide 71 is moved by the actuator 72. By the operation, the first and second suction bars 21 and 22 approach each other and sandwich the package 70 supplied from below. In this case, the vacuum suction force is not yet applied to the opposing vacuum cup 29, and thereafter, the vacuum suction force is applied to the vacuum cup 29 while the movable platen 10 is rotated in the direction of the arrow 74.

  In FIG. 8, the same number of sub-ports 75 as the suction ports 50 are formed, and each sub-port 75 moves along the sub-groove 76 outside the arc groove 52 in FIG. An opening section 81 that opens the opening edge of the bag by separating the first and second suction bars at a 45 degree angle in the direction of travel of the port with respect to the bag supply section 80, and Although the filling section 82 is provided, the sub-groove 76 is formed from the bag supply section 80 to the front of the filling section 82 of the article to be packaged, and on the communication passage 77 that is an upper opening hole of the sub-groove 76, FIG. Thus, an alarm switch 78 that reacts to changes in the vacuum value is installed.

  A pressure transmission pipe 79 having one end connected to the secondary chamber 46 in FIG. 4 communicates with the subport 75 via a signal passage 68 formed in the stationary platen 10 in FIG. In FIG. 4, when both the first and second suction bars at the tip of the rod-shaped guide 25 are securely adsorbing the packing bag, the degree of vacuum in the secondary chamber 46 is maintained, but the supporting of the packing bag is uncertain. When the next chamber 46 changes to atmospheric pressure, this atmospheric pressure activates the alarm switch 78 via the pressure signal tube 79, and the action of stopping the filling operation of the package in the packing section 82 in the filling section 82 of FIG. Can be planned.

In FIG. 4, a current-carrying terminal (not shown) on one side is fixed to the truncated conical valve 43 via an insulating material, while a current-carrying terminal on the other side is placed inside the valve box 41 so as to face this terminal. (Not shown) is fixed. If the atmospheric pressure exceeding the allowable value acts on the secondary chamber 46, the truncated cone valve 43 contacts the valve seat 42 to close the orifice, but in this case, the terminal also contacts to generate a current. An alarm signal can be transmitted with this current flow to stop the filling of the bag in the filling section. However, such a signal is transmitted only in the region from the bag feeding section 80 for supplying the package between the first and second suction bars in FIG. 7 to the section 82 for filling the package with the package. In other areas, the connection between the alarm signal body and the power source is cut.

Partial side view of rotary bagging machine Partial top view of rotary bagging machine Plan sectional view of both first and second suction bars Cross section of pressure control valve Rotary valve partial sectional view Top view of rotary valve Explanatory drawing of fixed plate of rotary valve Explanatory drawing of rotary valve movable plate

Explanation of symbols

10 ...... Movable plate 20 ...... Fixed plate 21 ...... First suction bar 22 ...... Second suction bar 23 ...... Fixed sleeve 25 ...... Rod-shaped guide 30 ...... Rotary valve 35 ...... Pouch 40 …… Pressure control valve 42 ... Valve seat 43 ... Cutting cone valve 45 ... Primary chamber 46 ... Secondary chamber 48 ... Connection pipe 49 ... Passage 50 ... Switching port 52 ... Arc groove 58 ... Compression coil spring 59 ... 1st screw 60 ... 2nd screw 68 ... Signal path 75 ... Sub port 76 ... Sub groove 77 ... Communication path 48 ... Alarm switch 79 ... Pressure signal pipe 80 ... Bag feeding section 82 ... Filling section

Claims (3)

A plurality of bases are arranged at equal intervals on the peripheral surface of the movable plate rotating in contact with the fixed plate arranged on the machine base so as to rotate integrally with the movable plate. In addition to fixing one suction bar, a second suction bar that approaches and separates from the first suction bar is provided, and a vacuum suction force that is switched and adjusted by a rotary valve composed of the fixed plate and the movable plate is adjusted. In the rotary bag filling and packaging apparatus that acts on the respective vacuum ports of the opposing surfaces of the first and second suction bars via a vacuum suction connecting pipe that connects one end to the movable platen,
A primary chamber is formed on the pump suction side inside the valve box, and a secondary chamber is formed on the first and second suction bar sides, with a valve seat inside the valve box installed in the middle of the connecting pipe. In addition, the tension coil spring disposed in the primary chamber and the truncated cone valve disposed in the secondary chamber so as to open and close the valve seat are opposed to each other, while the tension coil spring is directed toward the truncated cone valve. A bag support comprising a first screw for adjusting the amount of compression and a second screw for adjusting the opening degree of the orifice in the valve seat by pushing the truncated cone valve toward the coil spring. apparatus. In the region from the bag feeding section for supplying the packaging bag from the outside between the first and second suction bars that rotate integrally with the movable platen, to the section for filling the packaging bag with the article to be packaged, An arc-shaped sub-groove is formed on the slide surface with the movable plate, and an alarm switch is installed on the upper surface of the fixed plate via a communication path connected to the sub-groove, while one end is inserted into the secondary chamber from the outside of the valve box The other end of the pressure signal tube is connected to one end of a signal passage formed in the movable platen, and the other end of the signal passage is opened in a sub-groove formation region in the fixed platen. . A plurality of bases are arranged at equal intervals on the peripheral surface of the movable plate rotating in contact with the fixed plate arranged on the machine base so as to rotate integrally with the movable plate. In addition to fixing one suction bar, a second suction bar that approaches and separates from the first suction bar is provided, and a vacuum suction force that is switched and adjusted by a rotary valve constituted by the stationary platen and the movable platen. In the rotary bag filling and packaging apparatus that acts on the respective vacuum ports of the opposing surfaces of the first and second suction bars via a vacuum suction connecting pipe that connects one end to the movable platen,
A primary chamber is formed on the pump suction side inside the valve box, and a secondary chamber is formed on the first and second suction bar sides, with a valve seat inside the valve box installed in the middle of the connecting pipe. In addition, the tension coil spring disposed in the primary chamber and the truncated cone valve disposed in the secondary chamber so as to open and close the valve seat are opposed to each other, while the tension coil spring is directed toward the truncated cone valve. A first screw for adjusting the compression amount and a second screw for adjusting the opening degree of the orifice in the valve seat by pushing the truncated conical valve toward the coil spring,
A normally open type terminal is installed between the conical valve and the valve seat, and the package is filled from the bag supply section that supplies the package from the outside between the first and second suction bars. A wrapping bag supporting device for transmitting an alarm signal with a current passing through the terminal that is closed as the truncated conical valve is closed to the valve seat only in a region up to the section to be operated.