JP3559483B2 - Quantitative filling method for packaged objects in packaging machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for quantitatively filling a packaged object such as a powder or a granular material in a rotary or linear reciprocating type packaging machine.
[0002]
[Prior art]
As a general filling device of a conventional rotary packaging machine, a large number of grip pairs are projected in the radial direction of the rotating body, and the supplied packaging bags are sequentially held in a hanging manner by each grip pair to form an opening station and a filling station. Station, top seal station, etc., while intermittently moving, filling a predetermined amount of items to be packaged with the filling funnel within the stop time of one process, sealing the bag mouth, and discharging the bag outside. An object is known from Japanese Utility Model Publication No. 62-21521. In addition, after carrying out large dispensing with the packaging bag gripped on the filling table side, re-gripping with the grip of the quantitative detector, dispensing and dispensing, weighing with the quantitative detector, and packing after filling. Japanese Patent Publication No. 6-29043 discloses a weighing and packaging method in which a bag is gripped again on the filling table side and then transferred to a seal table to seal the bag mouth.
[0003]
[Problems to be solved by the invention]
In the above-described conventional filling apparatus and the weighing / packaging method, the objects to be packaged are dropped in a state in which the filling funnel approaches the bag mouth of the packaging bag. However, when the object to be packaged is a powder such as flour or potato starch, there is a head drop from the bag mouth to the bag bottom, so that it rises up at the time of charging and the accommodation is poor. If it takes a long time for the rising to stop, the downtime at the filling station increases, which necessarily reduces the packing capacity. The soared powder is discharged to the outside by the suction device. However, even if the amount of sowing in each bag is small, the amount of the soaking reaches a non-negligible amount in proportion to the production amount, so that the soaring phenomenon is suppressed as much as possible. Is preferred.
In the latter weighing and packaging method, a structure for performing quantitative detection of an article to be packaged while holding a packaging bag is disclosed, but large dispensing input and small dispensing input are performed by a screw type feeding device provided in separate stations. Since the filling and the sealing of the bag mouth are performed on separate tables, the size of the packaging machine is increased, and the overall structure is complicated.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for quantitatively filling an article to be packaged in which the filling and quantitative detection of the article to be packaged are performed smoothly and quickly by a compact filling device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 provides a moving body intermittently moving between a number of stations with the same number of gripping means as the stations, and suspends the packaging bag with the bag mouth up. A number of grip bases having a pair of supporting grips are provided so that they can be gripped or released by corresponding gripping means, and lifting means for vertically moving a detector of a weighing device using a load cell are arranged at a filling station, Clamp means for holding or releasing a support rod vertically suspended from each grip base is provided so as to be fixed to the detector, and when the moving body stops intermittently at a filling station, the clamp rod is used by the clamp means. The grip base was released by the gripping means, and then the grip base was lifted up by the elevating means to be opened. With the bag facing the supply cylinder of the package supply unit, large-discharge charging of the package is started, and at the same time, small-discharge charging is performed while lowering the packaging bag, and the filling amount is detected by the detector. The charging is stopped after filling a predetermined amount, the grip base is gripped again by the gripping means, the base is fixed to the moving body side, and then the support rod is released by the clamp means. And
[0006]
Function and effect of the present invention
{Circle around (1)} When the moving body to which the grip base supporting the packaging bag is fixed stops intermittently at the filling station, the support rod of the grip base is gripped by the clamp means which stands by in an open state, and the grip base is released by the gripping means. Is performed. In a state where the grip base is separated from the moving body, the total weight of the separation unit (tare) is detected by the detector, and the zero point adjustment of the arithmetic processing unit of the weighing device is performed by the output signal.
{Circle around (2)} Next, the grip base is lifted by the operation of the lifting / lowering means, and large-discharge of the packaged object is started with the packaging bag facing deep into the supply cylinder of the packaged-material supplying means. At the same time, dispensing and feeding are continuously performed while lowering the packaging bag by the lifting / lowering means, and the filling amount of the object to be packaged is detected by the detector using the load cell in synchronization with the loading operation, and after filling the predetermined amount, The injection is stopped immediately. The number of times of detection of the packaged object is about 3 to 25 times per second. As the filling amount approaches the net amount, a data signal is output in real time from the sequence function of the weighing device to the package supply means, and the data signal is received. The package supply means performs optimal feedback control so that the screw is decelerated and the discharge gate is gradually narrowed.
{Circle around (3)} When the fixed quantity filling of the packaged object is completed, the grip base is gripped again by the gripping means and fixed to the moving body side, and then the support rod is released by the clamp means.
The above-described series of operations is performed within a stop time of the moving body at the filling station.
[0007]
According to the method for quantitatively filling the packaged object in this packaging machine, the filling and quantitative detection of the packaged object are smoothly and quickly performed by a compact quantitative filling device, and the powder is particularly prevented from rising when filling the packaged object. It is possible to correspond to a packaging machine with a high packaging capacity.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, examples of the method of the present invention will be described. FIG. 1 is a side view of a fixed quantity filling device of a rotary packaging machine suitable for the method of the present invention, FIG. 2 is an explanatory view showing a state in which a packaging bag is raised to a filling position in FIG. 1, and FIG. 3 is a plan view of a main part. .
[0009]
In the rotary type packaging machine using the fixed quantity filling device F, the supplied packaging bags are successively grasped in a hanging manner by each pair of grips, and are intermittently moved to respective stations such as an opening station, a filling station, and a top seal station. This is a general basic configuration in which a predetermined amount of a packaged object is filled within a stop time of one process, a bag mouth is sealed, and then discharged outside the machine. The configuration of the unit is changed.
[0010]
As shown in FIGS. 1 and 3, the disk-shaped moving body 1 that rotates intermittently between a number of stations is provided with the same number of gripping means 10 as the stations. A pair of longitudinal axes 12 and 12 are fixed to a base 11 attached to the lower surface of the moving body 1, and a substantially intermediate portion 13 a of a gripping lever 13 having an engagement groove 14 formed on the inner surface of the distal end is fixed to each fixed shaft 12. To be freely swingable. Reference numeral 15 denotes a support piece fixed to the lower surface of the base 11 at a center position between the longitudinal axes 12, 12, and the support piece 15 supports a substantially T-shaped rod 16 so as to freely slide in the radial direction of the moving body 1. are doing. At both ends of the head 16a of the rod 16, one end 17a of a link 17 is supported by a shaft 18, and the other end 17b of each link 17 is connected to a free end 13b of the gripping lever 13 by a shaft 19. I do. A roller-shaped piece 21 is attached to a shaft 20 fixed to the free end 16b of the rod 16 in the vertical direction. The pressing pieces 22 and 23 disposed before and after the piece 21 are provided so as to be movable in the front-rear direction by a drive mechanism (not shown) so that the piece 21 can be pressed freely.
[0011]
Thus, the gripping means 10 moves the engaging groove 14 side of the gripping lever 13 outward by pressing the piece 21 by advancing the pressing piece 22 and moving the rod 16 forward. When the pressing piece 22 is retracted and the other pressing piece 23 is advanced, the engaging groove 14 is moved inward. The closed posture of the gripping lever 13 is provided so as to be forcibly held by means such as a spring (not shown).
[0012]
Reference numeral 25 denotes a grip base provided with a grip pair 26 of a known structure for supporting the packaging bag a in a suspended state with the bag mouth b facing upward. A pair of longitudinal axes 27 and 27 fixed to the grip base 25 are provided with levers 28 and 30 so as to be freely swingable, respectively. A lever 31 having a piece 29 at the tip and the other lever 30 are linked by a link 31. At the same time, the extension spring 32 is bridged between the levers 28 and 30. Reference numeral 33 denotes an eccentric pin for bringing the side edge of the lever 28 into contact. A grip 34 having a claw 35 at the tip is fixed to the front side of the lever 28 and the lever 30 and a movable grip 36 having a claw 37 at the tip is slidably provided on the grip 34. As shown in FIG. 3, the claw pieces 35 and 37 are provided so as to sandwich the vertical side edge of the packaging bag a.
[0013]
Reference numerals 38, 38 denote plate pieces fixed to the rear edge of the lower surface of the grip base 25 at intervals in a straight line, and are gripped or released by the gripping lever 13 of the gripping means 10. The outer end surface shape of each plate piece 38 is provided so as to be securely fitted in the engagement groove 14 of the gripping lever 13 in a male and female relationship. Reference numeral 39 denotes a support rod suspended from the center front edge of the grip base.
[0014]
In the filling station, a motor-driven lifting device 50 that drives a rod 51 by a servo motor (not shown) is installed on the machine base 2 as lifting / lowering means for vertically moving a detector 61 of a weighing device 60 using a known load cell. . A mounting portion 61 a below the detector 61 is fixed to a base plate 52 fixed to the tip of a rod 51 of the electric lifting device 50. Reference numeral 53 denotes a support plate 53 fixed to a mounting portion 61b above the detector 61 for providing a clamp means 65 described later. Stopper bolts 54 and 55 are arranged at positions on the base plate 52 sandwiching the detectors 61 so that the heights thereof can be adjusted, and the stoppers 54 and 55 are fixed so that the detector 61 is not overloaded. The adjustment is performed so that an appropriate gap is formed between the upper surface and the lower surface of the support plate 53.
[0015]
In the present embodiment, a “load cell indicator F800” manufactured by Unipulse Co., Ltd. was used as the main device 62 that performs various settings and control processing of the weighing device 60.
[0016]
Numeral 65 is a clamping means for holding or releasing the support rod 39 of the grip base 25. A clamp cylinder 66 of the clamp means 65 is erected on the support plate 53, and a frame 68 is fixed to a tip of a rod 67. On the side of the frame 68, an inverted C-shaped engaging groove 69 is formed. Lower ends 71 a of a pair of front and rear clamp pieces 71 are attached to a fixed base 70 provided beside the clamp cylinder 66 by a shaft 72. Then, a pin 73 is inserted into a hole (not shown) formed below the clamp pieces 71 and a locking groove 69 of the frame piece 68 to restrain the clamp pieces 71 in a vertical position. It is provided as follows.
[0017]
Thus, the clamp means 65 is configured to close the clamp piece 71 by the extension operation of the rod 67 of the clamp cylinder 66, and to open the clamp piece 71 by the retreat operation of the rod 67.
[0018]
Reference numeral 80 denotes a supply tube of a screw (auger) type package supply means (not shown), and a distal end portion 81 of the supply tube 80 is provided with a discharge gate (not shown) for regulating discharge of the packaged material. I have. As shown in FIG. 1, the distal end portion 81 of the supply tube 80 is disposed slightly above the bag mouth b of the packaging bag a to be transferred.
[0019]
Next, the method of the present invention will be described in relation to the operation of the above-described quantitative filling apparatus F.
{Circle around (1)} When the moving body 1 to which the grip base 25 supporting the packaging bag a is supported by the grip pair 26 is intermittently stopped at the filling station, the clamp piece 71 which is opened and held by the clamp means 65 is closed to close the grip base 25. The support rod 39 is gripped.
(2) At about the same time, the gripping lever 13 of the gripping means 10 is opened, the engagement with the plate 38 is released, and the grip base 25 is released. In a state where the grip base 25 is separated from the moving body 1, the total weight of the separated portion is detected by the detector 61, and a zero point adjustment of the arithmetic processing unit of the weighing device 60 is performed by the output signal.
{Circle around (3)} Next, as shown in FIG. 2, the entire grip base 25 is lifted by the electric lifting / lowering device 50, and the package bag a is deeply exposed to the supply cylinder 80 of the package supply unit. Large outfeed is started. At the same time, the dispensing and dispensing is continuously performed while lowering the packaging bag a by retreating the rod 51 of the electric lifting device 50.
{Circle around (4)} The detector 61 detects the filling amount of the packaged object a in synchronization with the charging operation, and the charging is stopped immediately after filling the predetermined amount. The number of times of detection of the packaged object is about 3 to 25 times per second, and a data signal is output in real time to the package supply means from the sequence function provided in the main device 62 of the weighing device 60 as the filling amount approaches the net amount. In response to the data signal, the control section of the package supply means performs optimal feedback control such that the screw is decelerated and the discharge gate is gradually narrowed.
{Circle around (5)} When the fixed quantity filling of the packaged object is completed, the gripping lever 13 of the gripping means 10 is closed, so that the grip base 25 is gripped again and fixed to the moving body 1 side, and then the clamp piece 71 of the clamp means 65 is moved. When opened, the support rod 39 is released. Such a series of operations is smoothly performed within a stop time of only about 10 seconds at the filling station of the moving object.
[0020]
As described above, the method for quantitatively filling an object to be packaged in this packaging machine performs smooth and quick filling and quantitative detection of an object to be packaged by a compact quantitative filling device, and is particularly suitable for powder filling. is there.
[Brief description of the drawings]
FIG. 1 is a side view of a fixed quantity filling device of a rotary packaging machine suitable for the method of the present invention. FIG. 2 is an explanatory view showing a state where a packaging bag is raised to a filling position in FIG. 1. FIG. Plan view of [Description of symbols]
a → packaging bag b → bag opening F → quantitative filling device 1 → mobile 10 → gripping means 13 → gripping lever 14 → engaging groove 25 → grip base 26 → grip pair 35,37 → claw piece 38 → plate piece 39 → supporting rod 50 → motorized lifting device (lifting device) 60 → weighing device 61 → detector 65 → clamping device 66 → clamp cylinder 71 → clamp piece 80 → supply cylinder

Claims (1)

A moving body intermittently moving between a large number of stations is provided with the same number of gripping means as the stations, and a large number of grip bases each having a pair of grips for supporting the packaging bag in a hanging manner with the bag mouth facing upward are provided. A lifting means for vertically moving a detector of a weighing device using a load cell is provided at a filling station, and a supporting rod vertically suspended from each grip base is freely gripped or released by a mounting means. Clamping means is provided to be fixed to the detector, when the moving body is intermittently stopped at the filling station, gripping the support rod by the clamp means and release the grip base by the gripping means, Then, the packaging bag opened by lifting the grip base by the elevating means faces the supply cylinder of the article supply means. Large dispensing of the package is started, and at the same time, the dispensing and dispensing is performed while lowering the packaging bag, the filling amount is detected by the detector, the filling is stopped after the predetermined amount is filled, and the gripping means is again gripped by the gripping means. A method for quantitatively filling an article to be packaged in a packaging machine, characterized in that the base is gripped and the base is fixed to the movable body side, and then the support rod is released by the clamp means.

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