JPH11301622A - Vertical bag-making, filling and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a driving structure for a cutter and to enable the cutter to slide precisely to a desired position with a simple adjustment and control by a method wherein the cutter for cutting bags that are formed continuously is driven by a motor for which the amount of rotation can be controlled. SOLUTION: A pair of heater blocks 4 and 5 are mounted respectively to the front ends of sliders 20 and 21 that move in reciprocation to the right and left, and a crank member 23 driven by a stepping motor 22 and a motive power transmitting arm 24 are arranged behind the heater block 4 at one side, and a cutter fixing member 25 supported with a cutter support member 26 is constructed so that it can slide freely toward the right and left. The amount of rotation is controlled for the motor with an origin sensor 30 provided at a position near the stepping motor 22, and strokes are controlled for a cutter 7 fixed at the front end of the cutter fixing member 25 so that the cutter can be placed at a position for forming perforated incisions between adjoining packaging bags or a position for severing the packaging bags from one another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical bag making and filling machine for forming a packaging bag by sandwiching a cylindrically formed packaging film between a pair of heater blocks and heat sealing in the width direction.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing a schematic configuration of a vertical bag making and filling machine. The outline of the vertical bag making / filling / packaging machine will be described with reference to the figure. The belt-shaped packaging film 100 unwound from the winding drum 1 is wound downward around the outer peripheral surface of the cylindrical forming tube 2. Conveyed.

[0003] A heater 3 for vertical sealing is provided on the side of the forming tube 2, and the vertical sealing heater 3 heat seals the overlapping side end 100 a of the packaging file 100 wound around the forming tube 2. Then, the packaging film 100 is formed into a cylindrical shape.

Further, a pair of heater blocks 4 and 5 are provided below the forming tube 2 so that the packaging film 100 is formed.
Of the packaging film 100 which is provided to face each other with the transport path of
Is sandwiched between these heater blocks 4 and 5, and heat-sealed in the width direction to form a bag.

[0005] Thereafter, the inside of the packaging film 100 conveyed further downward is filled with an article to be packaged through the hollow portion of the forming tube 2, and a portion corresponding to the upper end is formed in the width direction by the heater blocks 4 and 5. At the same time as the heat sealing is performed, the cutter 7 attached to the heater block 4 is operated to cut substantially the center of the heat sealing portion 100b.

As shown in FIG. 6, the cutter 7 has a cutting edge provided in a hollow portion of one of the heater blocks 4 and is slid in a lateral direction by a driving source provided on the back side of the heater block 4. Thus, the cutting edge 7a can freely protrude and retract from the surface 4a facing the other heater block 5.

FIG. 7 shows a conventional vertical bag making and filling machine.
As shown in (a), the air cylinder 8 is used as a driving source of the cutter 7, and the cutter 7 is mounted on a driving rod 8 a of the air cylinder 8. As is well known, since the air cylinder 8 can perform only simple ON / OFF control, the stroke of the cutter 7 cannot be arbitrarily adjusted. Of course, the heat sealing portion 100 of the packaging film 100
There is no problem even if the cutter 7 is always reciprocated at a constant stroke only for the purpose of cutting a.

However, as shown in FIG. 8, there is a form of packaging formed by a vertical bag making and filling machine called a connected packaging bag in which a plurality of packaging bags 200 filled with articles to be packaged are connected. . This connected packaging bag is provided with a perforated cut 202 in a connecting portion (heat seal portion) 201 of each packaging bag 200.
Are formed in the width direction, and the packaging bag 200 can be easily separated by the cut 202.

[0009] Such a cut 202 is formed in each packaging bag 20.
0, the cutter 7 having a saw-toothed cutting edge 7a as shown in FIG.
It is necessary to stop the cutter 7 at a position where only the convex portion a passes through the connecting portion 201. Therefore, in order to form a connected packaging bag, the operation of stopping the cutter 7 at the position where the perforated cut 202 is formed in the connecting portion 201 and the operation of cutting between the packaging bags 200 in a predetermined cycle. It is necessary to switch and do it.

For this reason, in the conventional vertical bag making and filling machine, an auxiliary air cylinder 9 for stroke adjustment is added as shown in FIG.
The driving rod 9a of the auxiliary air cylinder 9 is fixed to the support base 10, and the air cylinder 8 for driving the cutter is mounted on the main body 9b of the auxiliary air cylinder 9 via the connecting plate 11.

The auxiliary air cylinder 9 slides the main body 8b of the air cylinder 8 right and left in FIG. 7 (b). When the main body 8b of the air cylinder 8 is disposed at the right end in FIG.
And the cutter 7 cuts between the packaging bags 200 when the main body 8b of the air cylinder 8 is disposed at the left end in FIG. Was.

[0012]

In the above-described conventional construction, in order to form a connected packaging bag, an auxiliary air cylinder 9 for moving the main body of the air cylinder 8 is provided in addition to the air cylinder 8 for driving the cutter. Since it is necessary, the driving portion of the cutter 7 becomes large. Since the driving portion of the cutter 7 is mounted on a slider (not shown) together with the heater block 4, a large load is applied to the slider due to the enlargement of the driving portion. As a result, there is a possibility that the durability of the slider may be reduced, or that the smooth movement of the heater block 4 may be impaired.

Further, in order to form a perforated cut 202 in the connecting portion 201 of the packaging bag 200, it is necessary to finely adjust the mounting positions of the air cylinder 8 and the auxiliary air cylinder 9 with high precision. The work was complicated. In addition, when the type of the packaging film is changed, it is necessary to finely adjust the mounting position of the air cylinder 8 and the auxiliary air cylinder 9 again with high accuracy in accordance with the thickness of the packaging film, which lacks versatility.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in addition to miniaturizing the driving structure of the cutter, the cutter can be slid to a desired position with high accuracy by simple adjustment and control. An object of the present invention is to make it possible to manufacture a connected packaging bag easily in response to film type switching.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to form a packaging bag continuously by sandwiching a cylindrically formed packaging film between a pair of heater blocks and heat sealing in the width direction. In a vertical bag making and filling machine, a cutter capable of cutting between successively formed packaging bags, a drive motor capable of controlling the amount of rotation for driving the cutter, and controlling the amount of rotation of the drive motor And control means for performing the control.

As described above, by using a drive motor capable of controlling the amount of rotation as a drive source of the cutter, the stroke of the cutter can be arbitrarily controlled by a single drive source, and miniaturization and easy positioning adjustment can be achieved. Can be realized. As the drive motor whose rotation amount can be controlled, for example, a stepping motor whose rotation amount can be easily adjusted by pulse control can be applied.

Further, the blade edge of the cutter is formed in a sawtooth shape, and the cutter is selectively moved to the next position (a) or (b) by controlling the rotation amount of the drive motor by the control means. Thus, it is possible to manufacture a connected packaging bag. (A) A position where a perforated cut is formed between the packaging bags. (B) A position where the packaging bags are cut between each other.

The cutting edge of the cutter may be any shape as long as a perforated cut can be formed between the packaging bags, and the mountain-shaped unevenness, the rectangular unevenness, and the like are collectively referred to as a sawtooth shape in this specification. Is called.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 5, below the forming tube 2, a pair of heater blocks 4 and 5 are provided to face each other with the conveyance path of the packaging film 100 interposed therebetween, and are sent downward by the feeding belt 6. The packaging film 100 is sandwiched between the heater blocks 4 and 5 and heat-sealed in the width direction.

As shown in FIG. 1, a pair of heater blocks 4 and 5 are mounted on the tips of sliders 20 and 21 which are reciprocally movable left and right. The film 100 is sandwiched and heat-sealed in the width direction. The driving structure of the cutter 7 is mounted on the back side of the heater block 4 in one slider 20, and reciprocates integrally with the slider 20 (see FIG. 1). In this embodiment, as a driving source of the cutter 7,
A stepping motor 22 is used.

A crank member 23 is fixed to a drive shaft 22a of the motor 22. The rotation of the crank member 23 is transmitted to a cutter fixing member 25 via a power transmission arm 24.
Conveyed to. The cutter fixing member 25 is slidably supported in the left and right direction in FIG. That is, as the stepping motor 22 rotates, the cutter fixing member 25 slides in the left-right direction in FIG.

The cutter 7 is fixed to the tip of the cutter fixing member 25, and is integrated with the cutter fixing member 25 as shown in FIG.
Slide left and right. As shown in FIG. 6, the blade edge 7 a of the cutter 7 has a saw-toothed unevenness.

In the vicinity of the stepping motor 22, an origin sensor 30 for detecting the origin of the motor 22 is provided. As the origin sensor 30, for example, a rotary encoder, an electromagnetic sensor, an optical sensor, or an ultrasonic sensor can be used. In this embodiment, the rotation angle when the cutter 7 slides to the rear end is set as the origin of the stepping motor 22 as described later.

FIG. 2 is an explanatory view of the operation of the cutter driving structure. As described above, in order to manufacture a connected packaging bag (see FIG. 8), the cutting edge 7a of the cutter 7 is connected to the connecting portion 2 of the packaging bag 200.
01 (slit forming operation) to a position where a perforated cut 202 is formed;
An operation (cutting operation) of sliding the cutting edge 7a to a position where the cutting edge 7a cuts between the packaging bags 200 is required.

In this embodiment, the stepping motor 2
When 2 rotates １ ／ from the origin, the cutting edge 7 of the cutter 7
Adjustment is made so that a slides to a position at which a cuts between the packaging bags 200 (FIG. 2B). Further, when the stepping motor 22 makes a quarter turn from the origin, the cutting edge 7a of the cutter 7 is adjusted to slide to a position where a perforated cut 202 is formed in the connecting portion 201 of the packaging bag 200 (FIG. 2 (d)).

As shown in FIG. 2A, the rotation angle of the stepping motor 22 when the cutter 7 slides to the rear end is set as an origin, and the origin sensor 30 detects this origin. When executing the cutting operation, the stepping motor 22 makes a half turn in the forward direction (counterclockwise direction in FIG. 2) from the origin (FIG. 2B). With this rotation, the cutting edge 7a of the cutter 7 slides to a position where the cutting edge between the packaging bags 200 is cut. Thereafter, the stepping motor 22 rotates in the forward direction, and stops when the origin sensor 30 detects the origin (FIG. 10C).

On the other hand, when executing the notch forming operation, the stepping motor 22 makes a quarter turn in the reverse direction (clockwise direction in FIG. 2) from the origin (FIG. 2D). With this rotation, only the convex portion of the cutting edge 7a is connected to the connecting portion 2 of the packaging bag 200.
The cutter 7 slides to a position where the cutter 7 penetrates. As a result, a perforated cut 202 is formed in the connecting portion 201 of the packaging bag 200. Thereafter, the stepping motor 22 rotates in the forward direction, and stops when the origin sensor 30 detects the origin (FIG. 9E).

FIG. 3 is a block diagram showing a control system (control means) of the stepping motor 22. As shown in the figure, the control system of the stepping motor 22 includes a controller 31, a counter 32, a pulse generator 33, a motor driver 34, and an origin sensor 30.

The controller 31 detects ON / OFF of the cutter switch 36, the heat seal switch 37, and the notch forming switch 38 provided on the operation panel 35, in addition to the origin detection signal from the origin sensor 30. These switches are turned ON / OFF by an operator, and when the cutter switch 36 is turned ON,
Power is supplied to the stepping motor 22, and the cutter 7 becomes operable. When the heat seal switch 37 is turned on, the power is turned on to the heater blocks 4 and 5, and the heaters in the heater blocks 4 and 5 are heated.

The notch forming switch 38 is a switch for selecting a packaging mode. When the switch 38 is turned on, the controller 31 executes a control operation for manufacturing a connected packaging bag. On the other hand, when detecting that the switch 38 is turned off, the controller 31 executes a control operation for manufacturing a single packaging bag.

At the time of manufacturing the connected packaging bag, the counter 3
2 counts the number of times the cutter 7 is driven, and outputs the count value to the controller 31. The controller 31
A cutting operation and a notch forming operation are selected according to the number of times the cutter 7 is driven. The controller 31 outputs a control command for the stepping motor 22 to the pulse generator 33 based on signals from the various switches and sensors described above.

The pulse generator 33 outputs a drive pulse for the stepping motor 22 based on a control signal from the controller 31. This drive pulse is applied to the motor driver 3
4 and the motor driver 34 drives the stepping motor 22 to rotate.

FIG. 4 is a flowchart showing the control operation of the stepping motor by the controller. First, the controller 31 checks the states of the cutter switch 36, the heat seal switch 37, and the notch forming switch 38 provided on the control panel 35 (S1, S2, S3).
When the cutter switch 36 and the heat seal switch 37 are
In the case of the FF, since the power is not turned on to the stepping motor 22 and the heater blocks 4 and 5, the control waits until these switches 36 and 37 are turned on.

The controller 31 executes control for manufacturing a connected packaging bag when the cut forming switch 38 is ON, and controls for manufacturing a single packaging bag when the switch 38 is OFF. Execute control.

That is, the notch forming switch 38 is
If N, the count value of the counter 32 is incremented by one (S4), and the count value of the counter 32 is confirmed (S5). Until the count value of the counter 32 reaches a preset value, the connecting portion 201 of the packaging bag 200
The control for forming the perforated notch 202 is executed.

In this case, a control command for rotating the stepping motor 22 in the reverse direction by 1/4 is output to the pulse generator 33 (S6). The pulse generator 33 generates a drive pulse based on the control command, and
4 is output. The motor driver 34 includes the pulse generator 3
In accordance with the drive pulse input from Step 3, the stepping motor 22 is rotated by 1/4 in the reverse direction.

As described above, the stepping motor 22
The cutter 7 slides to a position where only the convex portion formed on the cutting edge 7a penetrates the connecting portion 201 of the packaging bag 200 by the 1/4 reverse rotation of. As a result, a perforated cut 202 is formed in the connecting portion 201 of the packaging bag 200.

Subsequently, the controller 31 outputs a control command for rotating the stepping motor 22 in the forward direction (S7), and based on the control command, the pulse generator generates a required drive pulse, and the motor driver 34 rotates the stepping motor 22 in the forward direction according to the drive pulse.

When the stepping motor 22 is almost 1 in the forward direction,
After / 4 rotation, the origin sensor 30 detects the origin of the stepping motor 22 and outputs a detection signal. When the detection signal is input from the origin sensor 30 (S8), the controller 31 stops the rotation of the stepping motor 22 (S9).

The controller 31 repeats the above notch forming operation until the count value of the counter 32 reaches a preset value. For example, when manufacturing a connected packaging bag in which three packaging bags 200 are connected as shown in FIG. 8, the notch forming operation is repeated twice and the count value of the counter 32 becomes "3" (S5). ), The counter 32 is reset (S10), and the control shifts to cutting between the packaging bags 200.

That is, the controller 31 outputs a control command for rotating the stepping motor 22 in the forward direction by に to the pulse generator 33 (S11). The pulse generator 33 generates a drive pulse based on the control command and outputs the drive pulse to the motor driver 34. Motor driver 3
4 rotates the stepping motor 22 in the forward direction by １ ／ according to the drive pulse input from the pulse generator 33. As described above, 1/2 of the stepping motor 22 is used.
By the forward rotation, the cutting edge 7a of the cutter 7 is moved to the packaging bag 200.
Slide to a position that passes through Thereby, the spaces between the packaging bags 200 are cut off.

Further, the controller 31 continuously outputs a control command for rotating the stepping motor 22 in the forward direction (S12). Based on the control command, the pulse generator 33 generates a required drive pulse. The motor driver 34 responds to the drive pulse and
Is rotated in the forward direction.

When the stepping motor 22 further rotates by １ ／, the origin sensor 30 detects the origin of the stepping motor 22 and outputs a detection signal. Controller 31
Is when a detection signal is input from the origin sensor 30 (S1
3) Stop the rotation of the stepping motor 22 (S
14). When the notch forming switch 38 is OFF,
The control for cutting between the packaging bags 200 described above is repeatedly executed.

The present invention is not limited to the above embodiment. For example, if the type of packaging film to be supplied is changed, depending on the thickness of the film, etc.
It is necessary to adjust the rotation amount of the drive motor so that the cutter can perform the notch forming operation and the cutting operation.
This adjustment work can be easily performed only by changing the initial conditions input to the controller (control means).

[0045]

As described above, according to the present invention, the cutter is driven by the drive motor capable of controlling the amount of rotation, so that the drive structure of the cutter can be reduced in size and simple adjustment and control can be performed. Thereby, the cutter can be slid to a desired position with high accuracy.
In addition, it is possible to easily cope with the type change of the packaging film.

[Brief description of the drawings]

FIG. 1 is a front view showing a cutter driving structure of a vertical bag making, filling and packaging machine according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the cutter driving structure.

FIG. 3 is a block diagram showing a control system (control means) of the stepping motor.

FIG. 4 is a flowchart illustrating a control operation of a stepping motor by a controller.

FIG. 5 is a perspective view showing a schematic configuration of a vertical bag making and filling machine.

FIG. 6 is a perspective view showing the structure of a cutter.

FIG. 7 is a front view showing a conventional cutter driving structure.

FIG. 8 is a perspective view showing an example of a connection packaging bag.

[Explanation of symbols]

 4, 5: heater block 7: cutter 7a: blade edge 20, 21: slider 22: stepping motor 30: origin sensor 31: controller 32: counter 33: pulse generator 34: motor driver

Claims (2)

[Claims] 1. A vertical bag making and filling machine for continuously forming packaging bags by sandwiching a cylindrically formed packaging film between a pair of heater blocks and heat sealing in the width direction. A cutter capable of cutting between the packaging bags, a drive motor capable of controlling the amount of rotation for driving the cutter, and control means for controlling the amount of rotation of the drive motor. Mold bag making and filling machine. 2. The vertical bag making and filling machine according to claim 1, wherein the blade of the cutter is formed in a saw-tooth shape, and the cutter is controlled by the control means to control the amount of rotation of the drive motor. A vertical bag making and filling machine characterized by selectively moving to a position (a) or (b). (A) A position where a perforated cut is formed between the packaging bags (b) A position where the packaging bags are cut between the packaging bags