JP3904309B2 - Apparatus for adjusting the thickness of a package in a packaging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for adjusting the thickness of a package in a packaging machine.
[0002]
[Prior art]
In order to wrap a low-density content such as potato chips, a measure is taken to enclose gas together with the content so that the content is not damaged.
[0003]
These packages are boxed after being molded, but if a large amount of gas is enclosed, a certain number of packages cannot be stored, and if there is a small amount of gas enclosed, the package will dance inside. Each time the packaging machine is operated, the operator visually adjusts the amount of gas enclosed.
[0004]
As a matter of course, an air release member is pressed against both sides of the package just before the lateral seal for such a problem so as to remove excess air, which is disclosed in Japanese Utility Model Publication No. 50-10274. The amount of gas to be sealed varies greatly depending on the contents to be stored and the specific gravity of the contents, and the specific gravity of the contents changes every day. There is a problem that it cannot be adjusted correctly.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such a problem, and its object is to provide a new package thickness adjusting device capable of automatically and accurately adjusting the amount of gas sealed in the package. Is to provide.
[0006]
[Means for Solving the Problems]
That is, the present invention is a thickness adjustment device for a package in a packaging machine for achieving such a problem, and the cylindrical packaging material is thickened so as to discharge the excessively enclosed gas prior to the lateral sealing process. In a packaging machine comprising an air bleeding member that presses in a direction and a means for adjusting the pressing position of the air bleeding member to adjust the thickness of the cylindrical packaging material, the air bleeding member is constituted by a plurality of air bubbles In addition, a means for adjusting the amount of gas supplied to each of the soot according to the type of contents stored in the package is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, examples of the present invention will be described below.
FIG. 1 shows an embodiment of the present invention having the simplest configuration.
[0008]
In this embodiment, the lateral seal mechanism is configured such that the pivot shafts 1 and 2 are moved toward and away from each other while rotating the pair of pivot arms 1 and 1, and the lateral seal jaws 3 and 3 provided at the distal ends of the pivot arms 1 and 1. A substantially D-shaped locus is drawn on the shutter plates 4 and 4 and the squeeze plates 5 and 5 starting from the above, and the upper side in the moving direction is placed on the cylindrical packaging material S fed between them by the pull-down belts 12 and 12. In this squeeze region, the squeaking action is configured so that a lateral seal is applied in the lower seal region.
[0009]
As shown in FIG. 2, the shutter plates 4 and 4 disposed on the lower side in the moving direction of the lateral seal jaws 3 and 3 are provided with convex portions 4a... By sandwiching the wrapping material S in a zigzag manner, the gas inside the wrapping material S can be discharged while preventing the powder of the contents from entering the seal portion. As shown in FIG. 3, the squeeze plates 5 and 5 disposed on the upper side in the moving direction are provided with spacing adjusting screws 5a at both ends in the longitudinal direction of the opposing surface, and sandwich the packaging material S. It is comprised so that the gas inside the packaging material S can be discharged | emitted at the time of digging.
[0010]
On the other hand, actuators 6, 6 that respond to detection signals from the thickness detection sensor 16 of the package W are attached to the pair of lateral seal jaws 3, 3. The brackets 7, 7 operated in the thickness direction have air vent plates 8, 8 that are pressed against both sides of the packaging material S during the squeeze process to keep the thickness constant, and are excellent in the movement direction of the lateral seal jaws 3, 3. It is attached to the side via spring members 9 and 9.
[0011]
On the other hand, reference numeral 15 in the drawing is a seal checker for checking the sealing state of the package W packaged by the packaging machine. The seal checker 15 sandwiches the conveyed package W from above and below with a constant pressure. Thus, the seal portion is inspected for leaks, the thickness d of the package W in the sandwiched state is detected, and the actuator 6 is operated via the control means 18 based on the detection signal from the thickness detection sensor 16. Thus, the displacement amount of the air bleeding plate 8 is controlled.
[0012]
In the apparatus configured as described above, the packaging material S bent in a cylindrical shape is pulled down to the lateral seal portion by the pull-down belt 12, and the inside of the nitrogen gas together with the contents such as potato chips is contained therein. When such a gas is fed, the revolving arms 1 and 1 that have revolved into the squealing region first sandwich the upper end of the packaging material S between the shutter plates 4 and 4 and the squealing plates 5 and 5, and then the horizontal sealing jaws 3 and 3. The air bleeding plates 8 and 8 provided on the upper side in the moving direction press the both surfaces of the packaging material S to make the thickness uniform.
[0013]
The air bleed plates 8 and 8 are arranged in a state where the interval according to the thickness d of the packaging material S is controlled by an output signal from the thickness detection sensor 16 of the package W disposed under the seal checker 15. Both sides of S are pressed, and excess gas is discharged to the outside through the gaps provided at the joint surfaces of the squeeze plates 5 and 5 and the shutter plates 4 and 4 so that the thickness of the cylindrical packaging material S is made uniform. Operate.
[0014]
FIG. 4 shows a second embodiment of the present invention in which the pressing position of the air bleeding plate 8 is automatically positioned according to the bag size.
[0015]
In this embodiment, as the actuators 6 and 6 attached to the lateral seal jaws 3 and 3, the brackets 7 and 7 are moved in the thickness direction of the packaging material S, that is, the X-axis direction, and in the longitudinal direction of the packaging material S, that is, the Y-axis direction. The actuator 6 and 6 are configured to be controlled according to the bag size by a control device 10 to be described later, and configured by an operating rack and pinion or an air cylinder.
[0016]
The control device 10 uses a bag size input means 8 such as a keyboard for designating the bag size and the position information corresponding to the designated bag size based on the position information of the air bleeding plate 8 determined by the bag size stored in advance. The storage means 12 for outputting information to the displacement amount calculation means 13 and the displacement amounts in the X-axis direction and the Y-axis direction corresponding to the bag size are calculated, and the actuator 3 is controlled via the control means 14 based on the calculation results. It is comprised by the displacement amount calculating means 13 which outputs the signal to operate.
[0017]
According to this embodiment, by setting the position of the air bleeding plate 8 in the X-axis direction and the Y-axis direction according to the bag size, the center portion of the bag is always pressed so as to have a thickness corresponding to the bag size. This makes it possible to form an optimal bag.
[0018]
On the other hand, the embodiment shown in FIG. 5 shows still another embodiment of the present invention which is configured so that excessive pressing force is not applied to the easily cracked contents such as potato chips. .
[0019]
In this embodiment, a plurality of air vents 28 for pressing the both sides of the packaging material S are provided on a bracket 27 attached to the upper side of the lateral seal jaw 23 in the moving direction. Are connected to the pressurized air supply source 20 through the branch pipes 29, respectively, and the amount of air supplied to each gas bubble 28 is adjusted so that the pressing force for pressing the bag is controlled. And the amount of protrusion of each cell 28... Is changed along the unevenness of the bag so that the bag is pressed with a required pressing force as a whole.
[0020]
The control device for adjusting the air amount indicated by reference numeral 30 includes an external input means 31 such as a keyboard for designating the size of the bag to be molded and the type of contents to be stored, the size of the bag and the type of contents. Based on the air supply amount determined by the above, the storage means 32 for outputting the air supply amount set according to the designated bag size and the type of contents to the comparison means 33, and the air detected by the flow meter 26 Comparing means 33 which compares the supply amount with the set air supply amount and closes the switching valve 22 via the driving means 34 by the coincidence signal is constituted. In the figure, reference numeral 21 indicates a pressure regulating valve.
[0021]
In this embodiment, by adjusting the size of the bag and the content to be stored, the amount of air to be supplied to the child 28 is adjusted so that the thickness d according to the size of the bag is pressed, The amount of protrusion of each bubble 28 is changed along the unevenness of the bag, so that the volume of the bag is controlled according to the size without destroying the contents.
[0022]
By the way, the present invention has been described with reference to an example of a horizontal seal mechanism using a pair of horizontal seal members that draws a D-shaped trajectory. However, as in the apparatus shown in Japanese Utility Model Publication No. 50-10274, The present invention can also be applied to a lateral seal mechanism of a type that moves forward and backward from both sides with respect to a cylindrical packaging material.
[0023]
【The invention's effect】
As described above, according to the present invention, the thickness of the package can be accurately and automatically managed in the process of forming the package, and the uniform package can be formed and the packaging can be performed without any trouble. Can do.
In addition, by pressing each bag so that each bubble protrudes along the unevenness of the bag, the bag can have a required thickness without damaging the contents.
[0024]
In addition, since the air bleeding member can be adjusted in the thickness direction and the longitudinal direction based on the size signal of the packaging material, the central portion of the package is always pressed to match the thickness according to the size. Can do.
[0025]
Furthermore, since this air vent member is composed of a plurality of air bubbles and the amount of gas supplied to these air bubbles is adjusted according to the contents, By pressing the bag in such a way as to protrude the mood, the bag can have a required thickness without damaging the contents.
[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 a part of a shutter plate of the apparatus.
FIG. 3 is a view showing a part of a squeeze plate of the apparatus.
FIG. 4 is a block diagram of an apparatus showing another embodiment of the present invention.
FIG. 5 is a block diagram of an apparatus showing still another embodiment of the present invention.
FIG. 6 is a perspective view showing a main part of the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating arm 3, 23 Horizontal seal jaw 4, 24 Shutter plate 5, 25 Squeegee plate 8, 28 Air vent plate 16, 36 Thickness detection sensor 6, 26 Actuator 28 Pneumatic S for air vent S Cylindrical packing material

Claims (3)

Prior to the lateral sealing process, an air vent member that presses the cylindrical packaging material in the thickness direction so as to discharge the excessively enclosed gas, and a press of the air vent member to adjust the thickness of the cylindrical packaging material In a packaging machine comprising means for adjusting the position,
The air vent member is composed of a plurality of air bubbles, and means for adjusting the amount of gas supplied to each of the air bubbles according to the type of contents stored in the package is provided. Device for adjusting the thickness of a package in a packaging machine.   2. The package thickness adjusting device for a packaging machine according to claim 1, further comprising means for adjusting the air bleeding member in the thickness direction by an output signal of the package thickness detecting means.   2. The package thickness adjustment in the packaging machine according to claim 1, further comprising means for adjusting the displacement of the air bleeding member in a thickness direction and a longitudinal direction of the package according to a size signal of a specified packaging material. apparatus.

Images