JP5614683B2 - Automatic packaging machine - Google Patents

Description

  The present invention relates to an automatic packaging machine using an air cylinder as a drive source of a sealer opening / closing mechanism.

  In a vertical or horizontal automatic packaging machine, a strip-shaped packaging material is pulled out from a raw fabric roll by a paper feed mechanism and sent in a downstream direction, and is shaped into a cylinder by a cylinder making machine. The packaging material formed into a cylindrical shape is bonded to both ends in the width direction and vertically sealed, and the packaged product is input, filled, or fed in, at a position between the packaged product and the packaged product, By carrying out a horizontal seal in the direction crossing the packaging material formed into a cylindrical shape and cutting in the middle of the horizontal seal, a bag package body in which the packaged product is wrapped in the packaging bag is manufactured.

  In the vertical automatic packaging machine, the packaging material is sent in the vertical direction downstream from the cylinder making machine. On the other hand, in the horizontal automatic packaging machine, the downstream side from the cylinder making machine is sent in the horizontal direction. In addition, there are intermittent and continuous forms of packaging material feeding, but in any form, molding into a cylindrical package, vertical sealing, supply of packaged goods, horizontal sealing according to the packaging material feeding However, the bag package is manufactured sequentially or continuously.

  In automatic packaging machines, regardless of the vertical type, horizontal type, continuous feeding of packaging material, intermittent feeding of packaging material, etc., the packaging material is sandwiched between the vertical seal and horizontal seal, and heated and pressed. It is common to use a heat seal that seals. When heat sealing is performed, when the sealing operation is not being performed, the sealer that seals the packaging material is placed at a position separated from the packaging material, and sealing is performed by pressing close to the packaging material only during the sealing operation. . This is to prevent the packaging material from being damaged by excessive heating and generating defective packaging.

  For the reasons described above, in an automatic packaging machine, a sealer that heat-seals a packaging material regardless of a vertical type, a horizontal type, a continuous feeding of a packaging material, an intermittent feeding of a packaging material, or the like is both a vertical sealer and a horizontal sealer. An opening / closing mechanism is provided.

  Servo motors and air cylinders are often used as drive sources for the opening / closing mechanism. When the servo motor is used as the drive source, the open / close operation time and seal time can be managed by using the excellent control characteristics of the servo motor, and the position of the closing and opening can be managed, thus ensuring the operation reliability. There is an advantage of being. However, there is a drawback that a mechanism for converting the rotational motion of the servo motor into the opening / closing motion of the sealer is required, which makes the configuration complicated and increases the cost. When the air cylinder is used as a drive source, there is an advantage that the configuration can be simplified because the linear reciprocating motion of the air cylinder is directly used for the opening / closing motion of the sealer. However, since the operating speed of the air cylinder is determined by adjusting the flow control valve on the assumption that the pressure of the compressed air from the supply source is constant, the operating speed of the compressed air supplied to the flow control valve When the fluctuation occurs, the operation speed changes. Also, when the frictional resistance changes due to the aging of the air cylinder, the operating speed also changes. For the above reasons, there is a drawback that the opening / closing operation time and the sealing time are difficult to manage and lack of certainty (see, for example, Patent Document 1). Even when the air cylinder is used as a driving source, the management of the closing and opening positions can be confirmed by adding a reed switch for confirming the position of the piston rod to the air cylinder at the forward end or the backward end of the piston rod. (For example, refer to Patent Document 2) However, it is uncertain in managing the sealing time if only the positions of closing and opening are confirmed. For example, if a foreign object such as a broken piece of a packaged article is caught in a seal part, if the foreign object is an object that is easily crushed, the sealer presses and eventually reaches the forward end. It takes a lot of time to complete the advance due to the resistance. This means that the sealing time is shortened and there is a possibility of a sealing failure.

  As described above, in an automatic packaging machine, a servo motor is selected as the drive source when pursuing the certainty and high speed of the operation of the sealer opening / closing mechanism, and an air cylinder is selected as the drive source when pursuing the simplicity of the configuration. ing.

JP-A-10-101027 (paragraphs 8 to 10) JP 2007-168827 A (paragraph 21)

  In recent years, automatic wrapping machines are required to have a high operating rate, a low defect occurrence rate, and a function that prevents defective products from being distributed by eliminating them from the system when defects occur. In particular, the loss of defective products causes a great deal of damage to the automatic packaging machine user and is required not to occur. This is no exception even if the automatic packaging machine pursues simplicity of configuration.

  In pursuit of simplicity, even in an automatic packaging machine that uses an air cylinder as the drive source for opening and closing the sealer, the operating state of the heat sealer is monitored. A function to stop driving is required.

The present invention can calculate the sealer closing operation time and the sealer opening operation time from the signal input of the detector for detecting the closing position or the opening position of the sealer, the sealer closing signal output, and the opening signal output, respectively, and display and monitor them. At the same time, it is intended to solve the above-mentioned problem by providing a function for monitoring the closing operation time and the opening operation time by providing a permissible time and, if exceeded , providing an alarm stop .

The present invention forms a strip-shaped packaging material into a cylindrical shape, sandwiches both ends in the width direction of the packaging material molded into a cylindrical shape with a vertical sealer to provide a vertical seal, and a packaged product is filled. At the position between the product and the packaged product, the packaged product is packaged by sandwiching the packaging material formed in a cylindrical shape with a horizontal sealer in a direction crossing the packaging material and cutting in the middle of the horizontal seal. In an automatic packaging machine that produces a bag package wrapped in a bag,
An air cylinder for opening and closing the vertical sealer or the horizontal sealer for applying the vertical seal or the horizontal seal;
A detector for detecting a closed position or an open position of the vertical sealer or the horizontal sealer;
The opening / closing operation is controlled by outputting an opening / closing output signal to the vertical sealer or the horizontal sealer , and the state of the detector is monitored after the opening / closing output signal is output to close the vertical sealer or the horizontal sealer. Control means for calculating the operation time and the opening operation time;
Display of the closing operation time and the opening operation time ;
An indicator having setting means for setting a closing operation allowable time with respect to the closing operation time and an opening operation allowable time with respect to the opening operation time ;
It is an automatic packaging machine characterized by comprising.

In the automatic packaging machine of the present invention, a closing operation allowable time is provided in the closing operation time, the closing operation allowable time is set by a display device having the setting means, and the control means includes the closing operation allowable time and the closing operation time. The operation time is sequentially compared, and if the closing operation time exceeds the closing operation allowable time, it is determined that a package with a suspected sealing failure due to a short sealing time has occurred, and the alarm machine is stopped. be able to.

In the automatic packaging machine of the present invention, an opening operation allowable time is provided in the opening operation time, the opening operation allowable time is set by a display having the setting means, and the control means includes the opening operation allowable time and the opening operation time. If the opening operation time exceeds the opening operation permissible time, it is determined that a package that is suspected of being damaged by heat due to excessive sealing time has occurred, and an alarm is issued. The machine can be stopped.

  The automatic packaging machine of the present invention can be a horizontal automatic packaging machine in which a packaging material is fed in a horizontal direction.

  The automatic packaging machine of the present invention can be a vertical automatic packaging machine in which a packaging material is fed in a vertical direction.

The present invention provides a sealer closing time or an open position detector signal input, sealer close signal output, and open signal output to sealer closing operation time (time from sealer close signal output ON to piston rod forward end position detection. ), Sealer opening operation time (time from sealer opening signal output ON to piston rod forward end position detection signal OFF) can be calculated, displayed and monitored, and allowed for the closing operation time and the opening operation time When the time is exceeded and monitored, it is judged that there is a package with a suspected seal failure or a package with a suspected breakage due to heat. Can be prevented from being lost.

It is a schematic perspective view of the vertical automatic packaging machine of an Example. It is a vertical sealer schematic perspective view of the vertical automatic packaging machine of an Example. It is the schematic explaining control of a vertical sealer. It is the figure which showed the relationship between the operation | movement of a vertical sealer, and operation | movement allowance time. It is a figure of a display screen.

  An example when the present invention is implemented in a vertical sealer of a vertical automatic packaging machine that operates intermittently will be described with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a vertical automatic packaging machine in which the present invention is implemented. The belt-like packaging material Fw is fed by the length of the bag by the paper feeding belts 26a and 26b, wound around the bag making and filling cylinder 22 by the cylinder making device 6, and formed into a cylinder shape with overlapping edges in the width direction. The After the paper feeding of the packaging material Ft formed into a cylindrical shape is finished, the vertical sealer 8 and the horizontal sealer 9 are applied with the vertical seal 4 and the horizontal seal 3 respectively, and the packaged product is filled through the bag-filling cylinder 22. It is. The vertical sealer 8 is composed of a vertical preheating heater bar 27 and a vertical heater bar 28 each incorporating a heater for heating (not shown), and the overlapping edge of the packaging material Ft formed in a cylindrical shape in the horizontal direction. The vertical seal 4 is applied by sandwiching and heating. The horizontal sealer 9 is composed of horizontal heater bars 24a and 24b with built-in heaters (not shown). The horizontal seal 3 is formed by sandwiching and heating a cylindrically shaped packaging material Ft from the front and rear directions. Apply. The packaging material Ft formed into a cylindrical shape with the vertical seal 4 and the horizontal seal 3 and filled with a product is formed in a central portion of the horizontal seal 3 by a cutting blade (not shown) built in the horizontal heater bars 24a and 24b. And the bag package 7 is manufactured.

  FIG. 2 shows an outline of the configuration of the vertical sealer of the vertical automatic packaging machine which is an embodiment of the present invention. 2A shows a state in which the vertical sealer 8 is opened, and FIG. 2B shows a state in which the vertical sealer 8 is closed. The vertical sealer includes a vertical preheating heater bar 27 and a vertical heater bar 28. The vertical preheating heater bar 27 is fixed at a position slightly contacting the packaging material, and has a role of preheating to warm the overlapping edge of the packaging material Ft formed into a cylindrical shape. The temperature is set so low that the material is not thermally deformed. The vertical heater bar 28 is movable, set at a high temperature at which the sealing material of the packaging material is sufficiently welded, and is in an open position apart from the packaging material except during the sealing operation, and to the closed position during the sealing operation. It advances and presses and heats a packaging material between the vertical preheating heater bars 27, and implements a vertical seal.

  The air cylinder 29 opens and closes the vertical heater. The air cylinder 29 performs forward movement, that is, closing operation and backward movement, that is, opening operation, when compressed air is supplied and exhausted by the air pipes 31a and 31b. The air pipes 32 a and 32 b are connected to the direction switching electromagnetic valve 33, and compressed air is supplied to the direction switching electromagnetic valve 33 from the compressed air supply source through the compressed air supply pipe 34. A vertical sealer opening / closing output signal line 35 from the control means 50 (not shown in FIG. 2) is wired to the direction switching electromagnetic valve 33, and a vertical sealer opening / closing output signal 61 (not shown in FIG. 2) is provided. When turned ON, the direction switching solenoid valve 33 supplies air to the air pipe 32b and exhausts the air pipe 32a. The piston rod of the air cylinder 29 moves forward, that is, the vertical heater bar 28 moves to the closed position, and the vertical sealer opening / closing output signal is turned OFF. The switching solenoid valve 33 exhausts the air pipe 32b and supplies the air pipe 32a, and the piston rod of the air cylinder 29 moves backward, that is, the vertical heater bar 28 moves to the open position. The operating speed of the air cylinder 29 is determined by adjusting the flow control valves 31a and 31b. A reed switch 30 for detecting the position of the piston rod is attached to the air cylinder 29 so as to detect the position where the piston rod has moved forward, that is, the position where the vertical heater 28 is closed, and the reed switch signal output line 36 is connected to the control means 50. (Not shown in FIG. 2) Wiring is performed so as to input.

  Next, the control of the vertical sealer 8 shown in FIG. 2 by the control means 50 will be described with reference to FIG. FIG. 3 is a schematic diagram for explaining the control of the vertical sealer 8 shown in FIG. The arrow lines in FIG. 3 indicate the flow of data and signals. The display 70 having the setting means of this embodiment is a liquid crystal panel display provided with a display screen contact type switch (hereinafter referred to as a touch switch). The setting is made by the touch switch 72 and the display is made by the liquid crystal display 71. Done. The control means 50 is set by the touch switch 72 of the display unit 70 having setting means, and when the vertical sealer closing timing 67 stored in the storage unit 53 of the control means 50 is reached, the vertical sealer opening / closing output signal is sent to the direction switching electromagnetic valve 33. 61 is turned ON from the I / O unit 54 to operate the air cylinder 29 to perform the closing operation of the vertical heater bar 28, and the control / calculation unit 52 starts measuring the closing operation time 42. The control / calculation unit 52 uses the reed switch 30 that detects the position where the vertical heater bar 28 is closed as an operation confirmation sensor for the vertical heater bar 28, and sequentially changes the reed switch operation signal 62 input to the I / O unit 54. Monitoring, when the reed switch operation signal 62 is turned on, the measurement of the closing operation time 41 is finished, and the measurement is set by the touch switch 72 of the display unit 70 having the setting unit, and is stored in the storage unit 53 of the control unit 50. If it exceeds the stored closing operation permissible time 63, the automatic packaging machine is stopped by an alarm machine and an alarm signal is sent to a display 70 having setting means. The display device 70 having setting means displays a closing operation abnormality alarm 64 on the liquid crystal display 71 when the alarm generation signal is received. When the closing operation time 41 is within the range of the closing operation allowable time 63, the control / calculation unit 52 starts measuring the sealing time 45 and sends the data of the closing operation time 41 to the display device 70 having setting means. It waits until the vertical sealer opening timing 68 set by the touch switch 72 of the display unit 70 having the feeding and setting means and stored in the storage unit 53 of the control means 50 is reached. When the display device 70 having setting means receives the data of the closing operation time 41, the display 70 displays the closing operation time 41 on the liquid crystal display 71.

  While waiting for the vertical sealer opening timing 68 to be reached, the reed switch 30 is sequentially monitored to confirm that the vertical heater bar 28 remains in the closed position. This is for monitoring whether the vertical heater bar 28 is separated from the packaging material Ft formed into a cylindrical shape during sealing. If the signal of the reed switch operation signal 62 is turned off during this period, that is, between the time when the reed switch operation signal 62 is turned on and the vertical sealer opening timing 68, the control means 50 performs the vertical heater bar 28 during sealing. Is separated from the cylindrical packaging material Ft, it is determined that the sealing is not normally performed, the automatic packaging machine is stopped by an alarm machine, and an alarm generation signal is sent to the display unit 70 having setting means. The display device 70 having setting means displays a seal operation abnormality alarm 69 on the liquid crystal display 71 when receiving the alarm generation signal.

  When the vertical sealer opening timing 68 is reached without the signal of the reed switch operation signal 62 being turned OFF, the control / calculation unit 52 of the control means 50 outputs the vertical sealer opening / closing output signal 61 OFF from the I / O unit 54, The opening operation of the vertical heater bar 28 is performed, and the measurement of the opening operation time 42 is started. The control / arithmetic unit 52 monitors the reed switch operation signal 62 input to the I / O unit 54 and ends the measurement of the opening operation time 42 when it is turned off. Compared with the closing operation allowable time 65 set by the touch switch 72 and stored in the storage unit 53 of the control means 50, if it exceeds, the automatic packaging machine is stopped by an alarm machine and an alarm is given to the display 70 having the setting means. Send generation signal. The display device 70 having setting means displays an opening operation abnormality alarm 66 on the liquid crystal display 71 when the alarm generation signal is received. When the opening operation time 42 is within the range of the opening operation allowable time 65, the control / calculation unit 52 ends the measurement of the sealing time 45 and displays the data of the sealing time 45 and the opening operation time 42 with setting means. Send to vessel 70. When the display unit 70 having setting means receives the data of the sealing time 45 and the opening operation time 42, the display unit 70 displays the sealing time 45 and the opening operation time 42 on the liquid crystal display 71.

  Next, the vertical sealer opening / closing output signal 61 and the reed switch operation signal 62 input / output to / from the I / O unit 54 of the control unit 50 and the input / output signal are measured by the control / calculation unit 52 of the control unit 50. The relationship between the closing operation time 41, the sealing time 45, the opening operation time 42, and the closing operation allowable time 63 and the opening operation allowable time 65 stored in the storage unit 53 of the control means 50 as the operation reference value of the vertical heater bar 28. This will be described with reference to FIG. The vertical sealer opening / closing output signal 61 shown in FIG. 4 is turned ON at the timing of the vertical sealer closing timing 67 and turned OFF at the timing of the vertical sealer opening timing 68. By turning ON / OFF the vertical sealer opening / closing output signal 61, the piston rod of the air cylinder 29 shown in FIG. 2 moves forward and backward, and the vertical heater bar 28 approaches and separates from the vertical preheating heater bar 27. The reed switch operation signal 62 shown in FIG. 4 is turned ON when the forward movement of the piston rod of the air cylinder 29 is completed, and turned OFF when the backward movement of the piston rod of the air cylinder 29 shown in FIG. That is, it is turned on when the vertical heater bar 28 comes close to the packaging material Ft formed in a cylindrical shape, and turned off when it is separated.

  As described above, the ON / OFF changes of the two input / output signals shown in FIG. 4, that is, the vertical sealer opening / closing output signal 61 and the reed switch operation signal 62, are respectively measured, and the closing operation shown in FIG. 4 is performed. Time 41, sealing time 45, and opening operation time 42 can be obtained. Furthermore, by providing a closing operation allowable time 63 and an opening operation allowable time 65 for the closing operation time 42 and the opening operation time 42, respectively, the closing operation takes too much time and the sealing time is shortened. It is possible to detect a suspicious package or a package that takes too much time to open and is suspected of being damaged by heat. When an operation exceeding the closing operation allowable time 63 and the opening operation allowable time 65 is detected, the control means 50 (see FIG. 3) immediately stops the machine, and the display 70 having the setting means (see FIG. 3) A signal is sent to notify the alarm stop due to the malfunction of the sealer 8 (see FIG. 1). A display device 70 (see FIG. 3) having setting means displays a warning on the liquid crystal display 71 (see FIG. 3) informing the occurrence of packaging failure due to malfunction of the vertical sealer 8 (see FIG. 1).

  Next, using FIG. 5 which is a diagram of a display screen in the present embodiment, how the closing operation time 41, the sealing time 45, the opening operation time 42, the closing operation allowable time 63, and the opening operation allowable time 65 are displayed. Or it will be explained. The display device 70 having setting means in the present embodiment is a panel type display device provided with a touch switch 72. The display is performed by the liquid crystal display 71. The upper part of the screen is an explanation display 40 explaining the relationship between the operation, the measured value, and the set value, and the lower part of the explanation display 40 is a monitor display of the closing operation time 41 and a monitor display of the opening operation time 42. Thereby, the closing operation time 41 and the opening operation time 42 can be monitored from the screen. The lower part of the operation time monitor display is a set value display and set button 43 for the permissible closing time 63, and a set value display and set button 44 for the permissible opening time 65. When the setting button 43 and the setting button 44 are pressed, a numerical value setting screen (not shown) is displayed so that the setting value can be changed. The set values of the permissible closing time 63 and the permissible opening time 65 are set with reference to the monitor display of the closing operation time 41 and the opening operation time 42 in consideration of the packaging material to be used and the operating capacity of the packaging machine. To do.

  In the above, the embodiment of the present invention in the vertical sealer of the vertical automatic packaging machine of intermittent operation has been described. However, if the sealer of the automatic packaging machine has an opening / closing mechanism using an air cylinder as a driving source, the vertical automatic packaging machine The horizontal sealer can also be used with the vertical and horizontal sealers of horizontal automatic packaging machines. In this embodiment, only one position detection reed switch is used for detecting the closed position. However, it is of course possible to separately provide the closed position detection and the open position detection. Further, the monitor display of the closing operation time 41 and the opening operation time 42 can of course be sampled several times and graphed, or the maximum value, minimum value, and average value can be calculated and displayed.

Fw Band-shaped packaging material Ft Packaging material formed into a cylindrical shape 3 Horizontal seal 4 Vertical seal 6 Tube maker 7 Bag packaging 8 Vertical sealer 9 Horizontal sealer 22 Bag making and filling cylinder 24a, 24b Horizontal heater bar 26a, 26b Paper feed belt 27 Vertical preheating heater bar 28 Vertical heater bar 29 Air cylinder 30 Reed switch 31a, 31b Flow control valve 32a, 32b Air pipe 33 Direction switching solenoid valve 34 Compressed air supply pipe 35 Vertical sealer opening / closing output signal line 36 Reed switch signal output line 40 Explanation display 41 Closing operation time 42 Opening operation time 43 Setting value display and setting button for permissible closing time 44 Setting value display and setting button for permissible opening time 45 Sealing time 50 Control means 52 Control / calculation unit 53 Storage unit 54 I / O unit 61 Vertical Sealer open / close output signal 62 Reed switch operation signal 63 Closed Allowable operation time 64 Closing operation abnormality alarm 65 Opening operation allowance time 66 Opening operation abnormality alarm 67 Vertical sealer closing timing 68 Vertical sealer opening timing 69 Seal operation abnormality alarm 70 Display with setting means 71 Liquid crystal display 72 Touch switch

Claims (5)

A band-shaped packaging material is formed into a cylindrical shape, and both ends in the width direction of the cylindrical packaging material are sandwiched between vertical sealers to provide a vertical seal, and the packaged product is filled, and the packaged product and packaged At the position between the products, the product is wrapped in a packaging bag by sandwiching the cylindrically shaped packaging material with a horizontal sealer in a direction crossing the packaging material and cutting in the middle of the horizontal seal. In an automatic packaging machine that produces rare bag packages,
An air cylinder for opening and closing the vertical sealer or the horizontal sealer for applying the vertical seal or the horizontal seal;
A detector for detecting a closed position or an open position of the vertical sealer or the horizontal sealer;
The opening / closing operation is controlled by outputting an opening / closing output signal to the vertical sealer or the horizontal sealer , and the state of the detector is monitored after the opening / closing output signal is output to close the vertical sealer or the horizontal sealer. Control means for calculating the operation time and the opening operation time;
Display of the closing operation time and the opening operation time ;
An indicator having setting means for setting a closing operation allowable time with respect to the closing operation time and an opening operation allowable time with respect to the opening operation time ;
An automatic packaging machine characterized by comprising. A closing operation allowable time is provided in the closing operation time, the closing operation allowable time is set by a display having the setting means, and the control means sequentially compares the closing operation allowable time and the closing operation time, When the closing operation time exceeds the closing operation permissible time, it is determined that a packaging body suspected of having a sealing failure due to a short sealing time has occurred, and has a function of stopping an alarm machine. The automatic packaging machine according to claim 1 . An opening operation allowable time is provided in the opening operation time, the opening operation allowable time is set by a display having the setting means, and the control means sequentially compares the opening operation allowable time and the opening operation time, When the opening operation time exceeds the opening operation allowable time, it was determined that a package that was suspected of being damaged by heat due to excessive sealing time was generated, and provided with a function to stop the alarm machine The automatic packaging machine according to claim 1 . The automatic packaging machine according to any one of claims 1 to 3 , wherein the automatic packaging machine is a horizontal automatic packaging machine in which a packaging material is fed in a horizontal direction. The automatic packaging machine according to any one of claims 1 and 3 , wherein the automatic packaging machine is a vertical automatic packaging machine in which a packaging material is fed in a vertical direction.

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