JP4336417B2 - Packaging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging machine, and more particularly to a vertical seal control device in a packaging machine.
[0002]
[Prior art]
The thermoplastic belt-shaped packaging material is transferred along the peripheral surface of the filling cylinder while being bent into a cylindrical shape by a former, and the vertical edges overlapped in the meantime are sealed by a vertical seal heater and below the filling cylinder. In a packaging machine that seals the top part of the bag and the ground part of the next bag at the same time with a horizontal seal heater arranged on the packaging machine, that is, a packaging machine called a vertical pillow packaging machine, A belt-type vertical seal mechanism is used as a means for fusing the contents, and the contents are filled and packaged continuously.
[0003]
This type of packaging machine does not stop the feeding of the packaging material unless it causes a problem, but the packaging machine owner / supplier supplies the goods to be filled from the weighing machine in response to the discharge request signal from the packaging machine. In the case of a measuring machine slave system, if the product is not supplied for some reason, the transport of the packaging material is temporarily stopped to separate the heater belt from the packaging material. In this case, the heater belt once contacts the vertical edge of the packaging material and repeatedly heats the same part in preparation for the next packaging. Inconveniences such as creating defective bags.
[0004]
On the other hand, if the feeding of the packaging material and the heater belt are actuated at the same time, the vertical sealing of the packaging material at the beginning of feeding cannot be performed sufficiently. This causes inconveniences such as damage to the surroundings and scattering of the filled product.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and the object of the present invention is to provide a new packaging machine that does not produce a defective package even when the product is supplied and then restarted. There is to do.
[0006]
[Means for Solving the Problems]
That is, in order to achieve the above object, the present invention is a packaging machine in which a thermoplastic belt-like wrapping material is bent into a cylindrical shape, and transported and laterally sealed while applying a vertical seal to the edge in the transport direction. It actuates the longitudinal sealing means for a time that can seal the strip packaging material emissions when request signal output to the weighing machine and a packaging material transfer means and the transverse sealing means waiting for the discharge completion signal from the weighing machine operated in Control means for performing control is provided.
[0007]
[Action]
With this configuration, the vertical packing is performed on the packaging material for the time required to issue the first discharge request signal to the weighing machine, and the operation of the pull-down mechanism and the horizontal sealing mechanism indicates the discharge completion signal from the weighing machine. By carrying out after waiting, it is possible to form a bag with a reliable seal from the beginning of the supply of goods.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, examples of the present invention will be described below.
All the drawings show one embodiment of the present invention.
[0009]
Below the weighing machine 1 having a large number of weighing heads, a hopper 2 for receiving the weighed and released items is arranged, and below this is a former 3 for bending the packaging material f into a cylindrical shape. A pull-down mechanism 5 for transferring the bent packaging material f to the horizontal sealing mechanism 7 and a vertical sealing mechanism 6 for providing a vertical seal at the vertical joint of the packaging material f are provided.
[0010]
FIG. 2 shows a vertical seal mechanism disclosed by the present applicant in Japanese Patent Application Laid-Open No. 6-239318. The vertical seal mechanism 6 disposed around the filling cylinder 4 together with the pull-down belt 51 includes a support pin 61. The vertical seal unit 63 can be separated from the filling cylinder 4 when the filling cylinder 4 is replaced by the swing arm 62 that swings around the fulcrum. Further, the vertical sealing belt 66 is attached to the filling cylinder 4 on the swing arm 62. A size-changing motor 64 that is positioned at a position corresponding to the diameter of the belt, and a belt contact / separation mechanism that operates by operating the electromagnetic valve 65 to release the pressing of the vertical seal belt 66 from the surface of the packaging material f when the apparatus stops. A cylinder 67 is provided.
[0011]
In the drawing, reference numeral 68 denotes a seal position changing knob, and 69 denotes a sleeve that changes the angle of the vertical seal belt 66 with which the packaging material f contacts.
[0012]
Returning to FIG. 1 again, reference numeral 10 in the drawing is a control circuit that forms part of the packaging machine itself or a host computer that controls the entire packaging system. This control circuit 10 measures the operation by pressing an operation switch (not shown). A discharge request signal output means 11 for outputting a discharge request signal to the machine 1, a discharge completion signal input means 12 for receiving a discharge completion signal from the weighing machine 1 and outputting a signal to the timer 13, and a discharge completion signal After a mechanical delay time T1 (described later), a mechanical delay is generated by the timer 13 that outputs an operation signal to the drive motor 52 of the pull-down mechanism 5 and the arm drive motor 72 of the lateral seal mechanism 7 and the pressing of the operation switch. The calculation means 14 for subtracting the required vertical seal time T2 (described later) from the time T1 and outputting the T1-T2 signal to the solenoid valve actuation signal output means 15, and the calculation at first. The operation signal is output by the output signal from the stage 14, and then the operation signal output means 15 for outputting the operation signal to the electromagnetic valve 65 after waiting for the signal from the timer 13, and the vertical direction of the packaging material f by type. The packaging material information input means 16 inputs the sealing time T2 to the calculation means 14.
[0013]
Note that the mechanical delay time T1 described above means that the jaw 71 of the lateral seal mechanism 7 also moves from the origin position 0 when the product discharged from the weighing machine 1 reaches the meshing point as shown in FIG. The time required to delay the operation of the horizontal sealing mechanism 7 and the pull-down mechanism 5 so that the meshing point is reached and the conveyance of the packaging material f starts from this point, and the vertical sealing time required. T2 refers to the time required to ensure vertical sealing over the entire distance between the pulleys of the vertical seal belt 66 according to the type of the packaging material f.
[0014]
Next, the packaging operation of the packaging machine configured as described above will be described based on the operation timing shown in FIG.
[0015]
When the operation switch is pressed under the condition that the required vertical sealing time T2 corresponding to the type of the packaging material f is previously input from the packaging material information input means 16 to the calculation means 14, the discharge request signal for the item to be enclosed Is output from the discharge request signal output means 11 to the weighing machine 1 (time point a). At the same time, the calculation means 14 calculates a time for subtracting the required vertical seal time T2 from the mechanical delay time T1 described above. If the discharge completion signal is not output from the weighing machine 1 until the predetermined time T3 elapses from the time point a, the signal from the solenoid valve operation signal output means 15 at the time point b when the calculated time T1-T2 further elapses. Thus, the electromagnetic valve 65 is actuated to drive the contacting / separating cylinder 67 so that the vertical seal belt 66 is brought into pressure contact with the vertical joint of the packaging material f for the required vertical seal time T2 to provide the required vertical seal.
[0016]
On the other hand, if the discharge completion signal is not output from the weighing machine 1 in spite of the output of the discharge request signal, the timer 13 does not operate, and therefore the pull-down mechanism 5 and the lateral seal mechanism 7 remain stopped. Keep state.
[0017]
When the weighing machine 1 does not operate for the second discharge request signal after one packaging cycle and the discharge completion signal is output from the weighing machine 1 for the nth discharge request signal at time point c, the discharge is completed. By the output signal after the mechanical delay time T1 from the timer 13 activated by the signal from the signal input means 12, the drive motors 52 and 72 of the electromagnetic valve 65, the pull-down mechanism 5 and the lateral seal mechanism 7 are timed d. Then, the vertical seal belt 66, the pull-down belt 51, and the horizontal seal jaw 71 are actuated to enter a predetermined packaging operation.
[0018]
By this operation, since the required vertical sealing is completed by the first press of the vertical seal belt 66 at the vertical joint of the packaging material f, the bag is completely formed and discharged from the beginning. .
[0019]
Further, when a discharge completion signal is output from the weighing machine 1 in response to the discharge request signal for the (n + 1) th and subsequent times, the solenoid valve 65 and the drive motors 52 and 72 of the pull-down mechanism 5 and the lateral seal mechanism 7 are respectively connected to the vertical seal belt. 66, the pull-down belt 51 and the lateral seal jaw 71 are continuously operated to perform a continuous packaging operation.
[0020]
On the other hand, the operation timing shown in FIG. 4 is for the case where the required vertical sealing time T2 is longer than the mechanical delay time T1 depending on the type of the packaging material f.
[0021]
That is, the operation timing in this case is such that when the operation switch (not shown) is turned on in a state where the long vertical seal time T2 is previously input to the computing means 14, the vertical seal time T2 is mechanically delayed. Since it is longer than T1, the solenoid valve actuating signal output means 15 outputs the solenoid valve 65 at a time that is | T1-T2 | time earlier than the time when the predetermined time T3 has elapsed from the output time point a of the discharge request signal. And the required vertical sealing process is performed on the packaging material f by the vertical sealing belt 66, and thereafter, the packaging operation is performed with the same operation as described above.
[0022]
In addition, although the above demonstrated the case where the discharge completion signal was not output from the weighing machine 1 with respect to the 1st discharge request signal after the operation switch after a packaging machine stop was pressed, it is 1st discharge When a discharge completion signal is immediately output from the weighing machine 1 in response to the request signal, if the required vertical sealing time T2 is shorter than the mechanical delay time T1, as shown in FIG. When the time T2 is longer than the mechanical delay time T1, as shown in FIG. 7, the timer 13 is operated before or after the solenoid valve 65 is energized, and the mechanical delay time T1 has elapsed. Needless to say, the pull-down mechanism 5 and the lateral seal mechanism 7 start to operate later.
[0023]
Further, as shown in FIGS. 6 and 7, when a discharge completion signal is output from the weighing machine 1 in response to the second discharge request signal, each drive of the solenoid valve 65, the pull-down mechanism 5 and the lateral seal mechanism 7 is driven. The motors 52 and 72 continuously operate the vertical seal belt 66, the pull-down belt 51, and the horizontal seal jaw 71, respectively, to perform a continuous packaging operation.
[0024]
For example, if the discharge completion signal is not output from the weighing machine 1 even after the predetermined time T3 has elapsed with respect to the third discharge request signal, the electromagnetic valve 65 is operated after the mechanical delay time T1 has elapsed. At the same time, the vertical seal belt 66 is separated from the vertical joint of the packaging material f, the drive motor 72 of the horizontal seal mechanism 7 is stopped, the horizontal seal jaw 71 is stopped at the origin position O, and the pull-down mechanism 5 is driven. The motor 52 is stopped while being decelerated, that is, the upper end portion of the vertically sealed portion is positioned slightly above the lower end portion of the vertical seal belt 66 while the transfer speed of the packaging material f by the pull-down belt 51 is reduced. The packaging material f is transferred and the drive motor 52 is stopped. By this time, the items discharged in response to the first and second discharge request signals are already packaged.
[0025]
Then, from the fourth discharge request signal, the operation similar to FIG. 3 or FIG. 4 described above or the operation described above with reference to FIG. 6 and FIG. 7 is performed.
3, 4, 6, and 7, the discharge request signal from the second time is automatically and periodically output to the weighing machine 1.
[0026]
The above is the description of the present invention in the case of a packaging machine that continuously performs a packaging operation, but the present invention can also be applied to a packaging machine that performs an intermittent packaging operation.
[0027]
【The invention's effect】
As described above, according to the present invention, the vertical sealing means is activated when the first discharge request signal is output to the weighing machine, and the packaging material transfer means and the horizontal sealing means are activated after waiting for the discharge completion signal from the weighing machine. Since the control means is provided, even if the discharge completion signal from the weighing machine is traced, a good quality bag is formed from the beginning by performing a reliable vertical sealing process when the first discharge request signal is output. Make it possible.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention.
FIG. 2 is a view showing details of a vertical seal mechanism.
FIG. 3 is a diagram showing timing of a packaging operation.
FIG. 4 is a diagram showing the timing of another packaging operation.
FIG. 5 is a diagram illustrating timing for explaining a mechanical delay time.
6 is a diagram showing timing of another packaging operation corresponding to FIG. 3. FIG.
FIG. 7 is a diagram showing the timing of another packaging operation corresponding to FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Weighing machine 5 Pulldown mechanism 52 Pulldown belt drive motor 6 Vertical seal mechanism 65 Electromagnetic valve 7 Horizontal seal mechanism 72 Horizontal seal jaw drive motor 10 Control circuit f Packaging material

Claims (2)

In a packaging machine in which a thermoplastic belt-like wrapping material is bent into a cylindrical shape and transported and laterally sealed while applying a vertical seal to the edge in the transport direction,
It actuates the longitudinal sealing means for a time that can seal the strip packaging material during emissions request signal output to the weighing machine, actuate the packaging material transfer means and the transverse sealing means waiting for the discharge completion signal from the weighing machine A packaging machine provided with control means for controlling as described above. In a packaging machine in which a thermoplastic belt-like wrapping material is bent into a cylindrical shape and transported and laterally sealed while applying a vertical seal to the edge in the transport direction,
When the discharge completion signal from the weighing machine is not output in response to the discharge request signal to the weighing machine, the vertical sealing means is operated for a time during which the band-shaped packaging material can be sealed, and then the discharge completion signal is output. packaging machine, characterized in that a control means for controlling so as to start the operation of the packaging material transfer means and the transverse sealing means after a predetermined time has elapsed.

Images