JP6117543B2 - Rotating cutter for automatic packaging machine - Google Patents

Description

The present invention is a vertical heat-sealed to the packaging film, and relates to a suitable rotary cutter device used in an automatic packaging machine for producing a packaging bag is subjected to lateral heat sealing, in particular, relates to rotation control of the rotary cutter device It is.

A conventional automatic packaging machine draws a roll-shaped packaging film upward by a feeding mechanism, turns it vertically downward by a guide roll at the uppermost position, folds it in a width direction by a folding mechanism, and then folds this film in two. The packaging film in a state is guided to a pair of vertical seal rolls to perform vertical seal. The packaging film folded in half by this vertical seal is joined to both ends to form a cylindrical shape, and then this cylindrical packaging film is guided by a pair of first horizontal sealing rolls to be laterally sealed and has a bottomed shape . After the contents of the packaging bag are charged by the filling mechanism, a horizontal seal is applied again to the charging port of the packaging bag by the first horizontal sealing roll to be in a sealed state.

Next, for the part laterally sealed by the first lateral seal roll, after performing a lateral seal again using a pair of second lateral seal rolls to increase the seal strength, this continuous packaging bag is It is guided to the cutter device, and is subjected to separation processing or perforation processing in the vicinity of the center of the horizontal seal to form an individual packaging bag.

Such a conventional cutter device for an automatic packaging machine often uses a rotary cutter device in which two cutter blades (a fixed blade and a rotary blade, etc.) come into contact with each other to cut a packaging film. In the cutter device, when cutting the packaging film, either one or both cutter blades are placed diagonally so as to achieve continuous point contact, and the sharpness improvement and reliable detachment operation is performed while moving the point contact cutting point. Had been implemented.

Japanese Patent Laid-Open No. 10-015877 JP 2002-145203 A JP 2004-359385 A

  In such a conventional automatic packaging machine, recently the performance has been remarkably improved, and in particular, the production speed of packaging bags has been increasing. For this reason, with the increase in the production speed of packaging bags, the following problems have become apparent in conventional rotary cutter devices.

That is , in the point contact cutting operation with improved sharpness, the point contact point of the rotary cutter device moves so as to move from the cutting start end to the cutting end end of the packaging bag, so a certain cutting time is required. . And since the conveyance operation of the packaging bag is also continued during this period, the problem that the cutting line of the packaging bag is shifted obliquely as the conveyance speed of the packaging bag is increased cannot be ignored.

  FIG. 5 is a schematic operation explanatory view of the conventional rotary cutter device 109 as viewed from the side. As shown in FIG. 5, the conventional rotary cutter device 109 includes a fixed cutter blade mounting member 123 fixed to the automatic packaging machine body, a fixed cutter blade 124 mounted to the fixed cutter blade mounting member 123, and a servo. The rotary cutter shaft 120 is driven to rotate by a motor or the like, the rotary cutter blade mounting member 121 is fixed to the rotary cutter shaft 120, and the rotary cutter blade 122 is attached to the rotary cutter blade mounting member 121. Yes.

The fixed-side cutter blade mounting member 123 is fixed to the automatic packaging machine main body in a horizontal state when viewed from the front. It is fixed to the shaft 120. For this reason, the contact state of the fixed cutter blade 124 and the rotary cutter blade 122 is point contact, and when the rotary cutter blade 122 rotates, this point contact point is between the cutting start end and the cutting end end of the packaging bag. To move.

A continuous packaging bag FY produced by an automatic packaging machine and sent downward at a conveyance speed PV1 is sandwiched between the fixed cutter blade 124 and the rotary cutter blade 122. In FIG. The state where the cutting operation by the cutter blade 122 is performed is shown. In the cutting operation shown in FIG. 5, the rotary cutter shaft 120 driven to rotate by a servo motor or the like rotates at a constant speed V0 that is a constant rotational speed calculated from the feed speed of the packaging film and the packaging bag dimensions.

  FIG. 6 is a diagram illustrating a cutting line of the continuous packaging bag FY cut by the conventional rotary cutter device 109. As shown in FIG. 6, the conventional automatic packaging machine performs the cutting operation shown in FIG. 5 by the rotary cutter device 109 while feeding the continuous packaging bag FY downward at the conveyance speed PV1.

  For this reason, the cutting line of the continuous packaging bag FY is formed from the cutting start end 130 to the cutting end end 131 of the packaging bag at the cutting speed V1, and is cut so as to be obliquely shifted as shown in FIG. In other words, the L1 deformation occurs in the cut individual packaging bag 115, and this cutting line inclination error causes a reduction in the production quality of the packaging bag.

Incidentally, the cutting line tilt error becomes indeed many if faster transport speed of the packaging film according to the automatic packaging machine, also, as the distance from the cutting start end 130 of the packaging bag to the cutting ending edge 131 is longer, the cutting time Therefore, there are many problems .

The present invention is prevented in the conventional rotary cutter device for automatic packaging machines, to minimize the oblique displacement of the cutting lines generated with the cutting operation of the continuous packaging bags, it disconnected the production quality degradation of the individual packaging bag The purpose is to do.

In order to achieve the above object, a rotary cutter device for an automatic packaging machine according to claim 1 of the present invention is a heat seal that forms a bag shape with respect to a stacked packaging film while transporting the folded packaging films. After the contents are put into the sealed bag, heat sealing is performed again to form a continuous packaging bag in which the inlet is sealed, while the cutter blade that contacts the rotating rotary cutter blade is pointed while arranged to be inclined so as to contact against the continuous packaging bag, a rotating cutter device for an automatic packaging machine which is configured to perform cutting or perforation cuts per a predetermined number, the Before the cutting or perforation operation is performed, the rotary cutter device accelerates toward a predetermined acceleration rotation value, and cuts or perforation. When carrying out the work is to maintain a predetermined rotational acceleration value, if the cutting or perforation cut operation ends, the rotation control so as to decelerate the predetermined rotational acceleration value Rutotomoni, of the rotary cutter device The rotation control is characterized in that the acceleration rotation value is changed in accordance with the conveyance speed of the automatic packaging machine and the cutting or perforation cut distance .

Further, in the rotary cutter device for an automatic packaging machine according to claim 2 of the present invention, the accelerated rotation value of the rotary cutter device is such that the automatic packaging machine has a high conveying speed and a long cutting or perforation distance. When an acceleration rotation value faster than a predetermined value is selected, when the conveyance speed of the automatic packaging machine is slow and the cutting or perforation cut distance is short, an acceleration rotation value slower than the predetermined value is selected. It is characterized by that.

According to claim 1 the rotary cutter device for engaging Ru automatic packaging machine according to claim 2 of the present invention, by optimizing according to the rotational speed operating conditions in the cutting or perforation notch operation, a continuous packaging bag by shortening the time to appropriately cut, the errors of the cutting line tilt of disconnection or perforations cut operation, it is made possible to minimize.

As described above, the rotary cutter device for an automatic packaging machine according to the present invention minimizes the cutting line inclination error generated during the cutting or perforation operation, thereby reducing the finished dimensions of the separated individual packaging bags . by suppressing fluctuations, thereby preventing the occurrence of production quality degradation, that can maintain a stable and high productivity, and enables the excellent effects, which may provide an advantage.

It is a front view which shows the structural example of the roll type automatic packaging machine which concerns on this invention. It is schematic operation explanatory drawing which looked at the rotary cutter apparatus of this invention from the side. It is a figure explaining the cutting line of the continuous packaging bag cut | disconnected with the rotary cutter apparatus of this invention. It is operation | movement explanatory drawing explaining the motion of the rotary cutter apparatus of this invention on the time-axis. It is schematic operation explanatory drawing which looked at the conventional rotary cutter apparatus from the side. It is a figure explaining the cutting line of the continuous packaging bag cut | disconnected with the conventional rotary cutter apparatus.

First, the whole structure of the roll type automatic packaging machine which concerns on the Example of this invention is demonstrated using FIG. FIG. 1 is a front view showing a configuration example of a roll type automatic packaging machine according to an embodiment of the present invention. As shown in FIG. 1, a reel is provided on the front right side of a roll type automatic packaging machine 1 (hereinafter abbreviated as automatic packaging machine 1). On this reel, an original fabric roll FH around which a packaging film F is wound is held so as to be removable.

Further, the upper side portion of the automatic packing machine 1, a film feeding mechanism 2, a film wrapping roll 3, a film folding mechanism 4 for two-folded packaging film F longitudinally, this two-folded packaging film FX There is a filling pipe 5 for feeding the contents inside.

On the front surface of the automatic packaging machine 1 , from the upper side, a vertical sealing device 6, a first horizontal sealing device 7, a second horizontal sealing device 8, a cutter device 9, a notch cutter device 12, an alignment mechanism 13, a packaging bag discharge mechanism 14 (discharge guide) ) Is provided. Further, on the right side of the automatic packaging machine 1, there are provided a control box 10 and an operation box 11 for controlling operation control and operation instructions of the automatic packaging machine 1.

The vertical seal mechanism is constituted by a vertical seal device 6 , and in FIG. 1, a front side vertical seal roll (moving side seal roll) is shown. On the other hand, the vertical seal roll on the back side (the back side of the paper) is provided in a state facing the front side vertical seal roll in the direction perpendicular to the paper surface, and is fixed to the automatic packaging machine 1 (fixed side seal roll).

Transverse sealing mechanism includes a first transverse sealing device 7 is composed of a second transverse sealing device 8, in the figure 1 as the two transverse sealing device 7, 8, the front side of the upper and lower two lateral seal rolls (movable Only the seal roll) is shown. On the other hand, two horizontal seal rolls (not shown ) on the back side (the back side of the paper ) are provided in a state of facing the front side horizontal seal roll in a direction perpendicular to the paper surface, with respect to the base side of the automatic packaging machine 1 . It is fixed (fixed side seal roll).

The packaging film F is made of a transparent or translucent material, for example, a base film such as PET, or a heat seal film such as polyethylene having a melting point lower than that of the base film. The packaging film may have a three-layer structure of a base film, an intermediate film, and a heat seal film.

The packaging film F is pulled out by the film feeding mechanism 2 from the original fabric roll FH attached to the reel. The drawn packaging film F is passed over the folding roll 3 at the top of the automatic packaging machine 1 and sent to the film folding mechanism 4 directly below. The film folding mechanism 4 is for clamshell the sent come packaging film F in the longitudinal direction, the two-folded packaging film FX is feeding the contents into the secondary-folded packaging film in FX while sandwiching the filling pipe 5 for the front and back sides, is transmitted to the vertical sealing device 6 of the vertical sealing mechanism, further, longitudinal seal is applied to the secondary-folded packaging film end portions of the FX, packaging film FX-cylinder It becomes a shape.

The cylindrical packaging film FX is sealed in the horizontal direction (width direction) of the packaging film FX by the horizontal sealing roll of the first horizontal sealing device 7, and the bottom of the packaging bag 15 is formed by this horizontal sealing. A filling pipe 5 is inserted into a packaging film FX formed in a bottomed cylindrical shape, and the contents are filled into the packaging bag through the filling pipe 5.

  After that, the horizontal sealing roll of the first horizontal sealing device 7 horizontally seals the opening side of the packaging film FX filled with the contents, thereby sealing the contents filled in the bottomed cylindrical packaging film. It becomes a continuous packaging bag form. This continuous packaging bag is sent to the horizontal sealing roll of the second horizontal sealing device 8 directly below. The second horizontal seal roll forms a linear seal or the like for further laterally sealing the horizontal seal portion formed by the first horizontal seal device 7 to make the horizontal seal portion more reliable.

  The completed continuous packaging bag FY is sent to the rotary cutter device 9 while being held by the alignment mechanism 13 so as not to be laterally shaken, and is individually cut and perforated to the central portion of the horizontal seal. So as to be a packaging bag 15. That is, the cutter blade of the rotary cutter device 9 can be freely arranged in the form of a linear cutting blade or a perforated blade, and the cutting cutter device and the perforated cutter device can also be installed in parallel.

  The individual packaging bags 15 are led out of the automatic packaging machine 1 by the packaging bag discharge mechanism 14 and sent out to the subsequent process.

  FIG. 2 is a schematic operation explanatory view of the rotary cutter device 9 of the present invention as viewed from the side. As shown in FIG. 2, the rotary cutter device 9 of the present invention includes a fixed-side cutter blade attachment member 23 fixed to the automatic packaging machine body, a fixed cutter blade 24 attached to the fixed-side cutter blade attachment member 23, The rotary cutter shaft 20 is driven to rotate by a servo motor or the like, the rotary cutter blade mounting member 21 is fixed to the rotary cutter shaft 20, and the rotary cutter blade 22 is attached to the rotary cutter blade mounting member 21. ing.

  The fixed-side cutter blade mounting member 23 is fixed to the automatic packaging machine body in a horizontal state when viewed from the front, and the rotary-side cutter blade mounting member 21 is slightly tilted (tilt of several degrees) when viewed from the front. 20 is fixed. For this reason, the contact state of the fixed cutter blade 24 and the rotary cutter blade 22 is point contact, and when the rotary cutter blade 22 rotates, this point contact point is between the cutting start end and the cutting end end of the packaging bag. To move.

  And between the fixed cutter blade 24 and the rotary cutter blade 22, a continuous packaging bag FY produced by an automatic wrapping machine and sent downward at a conveying speed PV1 is sandwiched. In FIG. The state where the cutting operation by the cutter blade 22 is performed is shown. The cutting operation of the rotary cutter device 9 shown in FIG. 2 is as follows.

(1) Before performing the cutting or perforation cutting operation, the rotary cutter device 9 accelerates at an acceleration value A2 toward a predetermined acceleration rotation value.
(2) When the cutting or perforation cutting operation is performed, the rotary cutter device 9 maintains a predetermined acceleration rotation value.
(3) When the cutting or perforation cutting operation is completed, the rotary cutter device 9 decelerates at a deceleration value S2 from a predetermined acceleration rotation value.

  FIG. 3 is a diagram illustrating a cutting line of the continuous packaging bag FY cut by the rotary cutter device 9 of the present invention. As shown in FIG. 3, the automatic packaging machine of the present invention performs the cutting operation shown in FIG. 2 by the rotary cutter device 9 while feeding the continuous packaging bag FY downward at the conveyance speed PV1.

  For this reason, the cutting operation of the cutting line of the continuous packaging bag FY is performed at a high-speed cutting speed V2, which is a predetermined acceleration rotation value, and the cutting time from the cutting start end 30 to the cutting end end 31 of the packaging bag is conventional. Compared to the cutting time, the acceleration is shortened. For this reason, as shown in FIG. 3, it is possible to minimize an oblique shift compared to the conventional example. That is, the deformation of the cut individual packaging bag 15 becomes the value of L2, and this cutting line inclination error can be kept within the error range of the packaging bag manufacturing specification by the automatic packaging machine 1, Production quality can be maintained.

  FIG. 4 is an operation explanatory diagram illustrating the movement of the rotary cutter device 9 of the present invention on the time axis. In this drawing, the rotation speed value of the rotary cutter device 9 is displayed on the vertical axis and the rotation angle of the rotary cutter device 9 is displayed on the horizontal axis, and this movement becomes the cutting cycle operation. Moreover, the schematic side view of the rotary cutter apparatus 9 corresponding to a rotation angle is also written below. The cutting cycle operation shown in FIG. 4 is as follows.

  (1) When the angle between the fixed cutter blade and the rotary cutter blade of the rotary cutter device 9 is 180 °, the rotation is temporarily stopped in order to ensure the cutting cycle time. The rotating direction of the rotary cutter blade is counterclockwise as shown in the figure.

  (2) When the angle between the fixed cutter blade and the rotary cutter blade of the rotary cutter device 9 is -90 °, the rotational speed is gradually increased toward the cutting point of the continuous packaging bag.

  (3) When the angle of the fixed cutter blade and the rotary cutter blade of the rotary cutter device 9 is 0 °, the continuous packaging bag is cut or perforated. The rotational speed of the rotary cutter blade at this time is an acceleration rotational speed V1, which is significantly higher than the conventional constant speed rotational speed V0. And while cut | disconnecting or perforation cut | disconnection with respect to a continuous packaging bag, this acceleration rotational speed V1 is maintained and the cutting time is shortened suitably. Thereafter, after the end of cutting or perforation, the rotational speed of the rotary cutter blade is reduced.

  (4) When the angle between the fixed cutter blade and the rotary cutter blade of the rotary cutter device 9 is + 90 °, the rotational speed is gradually reduced toward a state where the rotation is temporarily stopped.

  (5) When the angle between the fixed cutter blade and the rotary cutter blade of the rotary cutter device 9 is 180 °, the rotation is temporarily stopped to ensure the cutting cycle time, and these cutting cycle operations Is repeated.

  Then, the value of the acceleration rotational speed V1 is used to convey the automatic packaging machine in order to minimize the cutting line inclination error, thereby suppressing the finished dimensional variation of the separated individual packaging bags and preventing the production quality from being deteriorated. The speed is changed according to the cutting or perforation distance.

  For specific rotation control of the rotary cutter device, if the conveyance speed of the automatic packaging machine is fast and the cutting or perforation cut distance is long, an acceleration rotation speed value faster than a predetermined acceleration rotation speed value V1 is selected. In addition, when the conveyance speed of the automatic packaging machine is slow and the cutting or perforation cut-in distance is short, an acceleration rotational speed value slower than a predetermined acceleration rotational speed V1 is selected.

  The embodiment of the present invention is an example for embodying the present invention, and has a corresponding relationship with the invention-specific matters in the claims, but is not limited thereto. Various modifications can be made without departing from the scope of the invention.

  For example, the method of determining the value of the acceleration rotational speed V1 in the present invention can be considered as follows, and is selected appropriately by the automatic packaging machine operator depending on the material of the packaging film used, the packaging bag specifications, and the like.

  (1) The operator of the automatic packaging machine is optimal from the operation box 11 of the automatic packaging machine 1 by manual operation taking into consideration the cutting speed or perforation cut distance determined from the conveyance speed of the automatic packaging machine 1 and the packaging bag manufacturing specifications. A case where a numerical value is input and the packaging machine control device mounted on the control box 10 controls the rotary cutter device 9 based on the input numerical value. (Manual selection control method)

  (2) The packaging machine controller of the automatic packaging machine 1 calculates the optimum numerical value according to the preset conveyance speed of the automatic packaging machine 1 and the cutting or perforation cut distance determined from the packaging bag manufacturing specifications. The case where the packaging machine control device itself automatically controls the rotary cutter device 9 based on the calculated value. (Automatic selection control method)

  Moreover, in this invention, although demonstrated using the rotary cutter apparatus of the vertical type automatic packaging machine, it is not limited to this, This invention is employable also in the rotary cutter apparatus of a horizontal type automatic packaging machine.

DESCRIPTION OF SYMBOLS 1 Roll type automatic packaging machine 2 Film feeding mechanism 3 Film folding roll 4 Film folding mechanism 5 Filling pipe 6 Vertical seal device 7 First horizontal seal device 8 Second horizontal seal device 9 Rotary cutter device 10 Control box 11 Operation box 12 Notch Cutter device 13 Alignment mechanism 14 Packaging bag discharge mechanism 15 Individual packaging bag 20 Rotating cutter shaft 21 Rotating cutter blade attaching member 22 Rotating cutter blade 23 Fixed cutter blade attaching member 24 Fixed cutter blade 30 Cutting start end of packaging bag 31 Packaging Cutting end of bag

Claims (2)

While subjected to heat seal to the bag-shaped with respect to packaging film superimposed while conveying the packaging film folded together, after turning the contents to bag which is sealed molded inlet is subjected to heat sealing again while forming a sealed continuous packaging bag, with the rotary cutter blade abutting the cutter blades rotate is arranged to be inclined so as to point contact, with respect to the continuous packaging bags, each a predetermined number in A rotary cutter device for an automatic packaging machine configured to perform cutting or perforation cutting,
The rotary cutter device accelerates toward a predetermined acceleration rotation value before performing a cutting or perforation cutting operation, and a predetermined acceleration rotation value when performing the cutting or perforation cutting operation. When the cutting or perforation operation is completed, rotation control is performed so as to decelerate a predetermined acceleration rotation value, and the rotation control of the rotary cutter device controls the conveyance speed of the automatic packaging machine and cutting or A rotary cutter device for an automatic packaging machine, characterized in that the acceleration rotation value is changed in accordance with the perforation distance . As the acceleration rotation value of the rotary cutter device, when the conveyance speed of the automatic packaging machine is fast and the cutting or perforation cut distance is long, an acceleration rotation value faster than a predetermined value is selected, and the automatic packaging machine conveyance 2. The rotary cutter device for an automatic packaging machine according to claim 1, wherein when the speed is low and the cutting or perforation cut-in distance is short, an acceleration rotation value slower than a predetermined value is selected .