JP3654983B2 - Initial setting method of horizontal seal timing of automatic packaging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides various packaging materials, such as solids, powders, semi-fluids, and liquids, with a long heat-weldable packaging film having a photoelectric tube mark with a pitch corresponding to the packaged product length. Optimum initial setting of the lateral seal timing of the lateral heat welding means against the difference between the photoelectric tube mark P and the seal position when replacing the packaging film, etc. in an automatic packaging machine that seals and wraps in particular On how to do.
[0002]
[Prior art]
In this type of automatic packaging machine, the part to be cut by horizontal sealing or section sealing on the material film is printed in advance as a photoelectric tube mark, etc., but due to the nature of the material film, the ambient temperature, humidity, printing, etc. It expands and contracts depending on how the supply tension is applied during the packaging operation, resulting in variations in the finished dimensions. Japanese Patent Publication No. 47-50153 discloses a conventional automatic seal interval adjusting device for an automatic packaging machine in which finished dimensions are adjusted in accordance with this variation. As shown in FIGS. 7 to 9, this apparatus folds the material film F made of polyethylene, polyvinyl chloride or other thermoplastic resin in the longitudinal direction while folding it in half along the longitudinal direction by the folding tool 2. The overlap edge is sandwiched between a pair of scissors welding rolls 3 and 3 and vertically welded to form a cylindrical material F1, and this material F1 is sealed in a lateral direction by a pair of rotating lateral welding tools 4 and 4 at a predetermined interval. After this sealing, the packaging material such as powdered foods and medicines is supplied from the quantitative supply device 5 and used for an automatic packaging machine in which the sealing portion is cut by the rotary cutter 7 after the next horizontal sealing. .
[0003]
In this automatic seal interval adjusting device, the drive shaft S2 of the saddle welding rolls 3 and 3 driven to rotate by the main motor M1 can be accelerated and decelerated by the differential gear D and the phototube motor M2, and the laterally rotating welding tool 4, A suitable power coupling means C is provided between the four shafts S4 and the main shaft S1, and the coupling means C is actuated once per rotation of the shaft S3 by the starting means A provided on the cutter shaft S3. The welding tools 4 and 4 are sealed, and the welding tools 4 and 4 seal the tubular material F1 once and leave the material F1. At the same time, the coupling means C is released and the shaft S4 is stopped. The camshaft S3 is provided with two cams 22 and 23, and comes into contact with each cam so that it can be opened and closed according to its contact position. When one is open, the other is in a relative contact position with the other being closed. Two The ichroic switches SW1 and SW2 are respectively opposed to the cam, and a photoelectric tube 19 is provided at an appropriate position for feeding the film F, and the motor M2 is turned on via the switches SW1 and SW2 by a pulse of the photoelectric tube mark P. An electrical circuit to be activated is formed.
[0004]
Thus, when the above-mentioned switches SW1 and SW2 are not in contact with the normal pulse receiving positions on the cams 22 and 23 when receiving these pulses, either one of the switches is operated to close this circuit, and the motor M2 Is rotated forward or backward, and the outer ring 21 of the differential gear D is rotated forward or reverse in the same direction as the planetary gear 20 to accelerate or decelerate the drive shaft S2, thereby correcting the delay advance of the photoelectric tube mark P. I do. In the case of a normal pulse receiving position, both switches SW1 and SW2 are opened to open the circuit, and a change gear B is inserted between the drive mechanisms of the welding rolls 3 and 3 so that the gear ratio can be changed as necessary. The horizontal seal and the cut portion are aligned with the photoelectric tube mark P.
[0005]
[Problems to be solved by the invention]
However, in the conventional automatic seal interval adjusting device for an automatic packaging machine, the photoelectric tube mark P which has reached the laterally rotating welding tools 4 and 4 by the cams 22 and 23 provided at two positions, a delay position and an advance position. Of the welding rolls 3 and 3 by causing the photoelectric tube 19 to recognize which range is delayed and moving the photoelectric tube motor M2 forward or reverse over a predetermined correction time in the direction of delay or advance. The rotational speed was decelerated or increased, and correction was gradually performed, which took time. In particular, when changing the film, it took time until the marks were matched in the initial stage.
The present invention has been proposed in view of the above points, and when the seal position is different from the photoelectric tube mark P of the packaging film, such as when the packaging film is replaced, the difference between the P and the seal position before starting full-scale operation. It is an object of the present invention to eliminate wasteful pitch matching operation by optimally setting the lateral seal timing of the lateral heat welding means.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the initial setting method of the horizontal seal timing of the automatic packaging machine of the present invention is a long-sized phototube mark having a pitch corresponding to the packaged product length and supplied in the longitudinal direction. The heat-weldable packaging film is guided to a molding chute, folded in half along the longitudinal direction, and both side edges are aligned, and the above-mentioned at a predetermined speed via a servo motor that receives pitch control by pitch control means including a phototube and a rotary encoder. A tube-shaped wrapping film is obtained by sealing the two side edges joined together by a saddle-direction heat welding means for supplying in the longitudinal direction, and is disposed downstream of the saddle-direction heat welding means and driven by another driving means. The tube-shaped packaging film is sequentially sealed horizontally by means of transverse heat welding, and encapsulated in a bottomed tube-shaped packaging film. Sealing after filling the product, cutting the transverse heat-welded part of the packaging film with cutting means to produce a packaged product, automatic packaging of powder and fluid etc. by the above process The initial direction of the transverse seal timing of the automatic packaging machine that performs transverse sealing by the transverse heat welding means with the photoelectric tube mark as a target by controlling the longitudinal supply speed of the saddle direction heat welding means with the servo motor. In the setting method, the photoelectric tube and the pitch control means are made operable by initial setting activation of the lateral seal timing before the main operation of the automatic packaging machine, and at the same time, the vertical heat welding means is activated by the servo motor activation. When the packaging film is operated to move and the photoelectric tube detects the photoelectric tube mark, the photoelectric tube mark closest to the upstream side of the transverse heat welding means is fixed. If there is a deviation between the seal timing of the transverse heat welding means that is in a standstill and waiting, the deviation is measured with a rotary encoder attached to the servo motor and the fixed position is stopped after the correction pulse has elapsed. Then, the transverse heat welding means in standby is operated, and if there is no deviation, the transverse heat welding means is operated at the same sealing timing, and the main operation of the automatic packaging machine is started. .
[0007]
According to the structure of the above-mentioned claim 1, in an automatic packaging machine, a long heat-weldable packaging film having a photoelectric tube mark having a pitch corresponding to the packaged product length and supplied in the longitudinal direction is used as a molding chute. Then, it is folded in half along the longitudinal direction, the both side edges are aligned, and the both side edges are sealed by saddle-direction heat welding means that feeds in the longitudinal direction under the control of the servo motor to obtain a tubular packaging film. Next, the transverse heat-sealing means arranged downstream of the saddle-direction heat-welding means sequentially performs horizontal sealing to obtain a bottomed tube-shaped packaging film in which powders, fluids, and the like are to be wrapped. After the product is filled, the product is sealed, and the package is manufactured by cutting the transverse heat-welded portion of the packaging film with a cutting means. It is possible to perform horizontal sealing by the horizontal heat welding means with the photoelectric tube mark as a target by controlling the longitudinal supply speed of the vertical heat welding means with a servo motor.
[0008]
The initial setting of the lateral seal timing before the automatic operation of the automatic packaging machine, such as after wrapping film replacement, enables the phototube and pitch control means to be operable, and at the same time, the vertical heat welding means is activated by the servo motor activation. Move the packaging film. When the photoelectric tube detects the photoelectric tube mark, there is a deviation between the closest photoelectric tube mark on the upstream side of the lateral heat welding means and the seal timing of the horizontal heat welding means waiting at a fixed position. The deviation is measured with a rotary encoder of the servo motor, the fixed position is stopped after the correction pulse elapses, and the transverse thermal welding means in standby is operated. If there is no deviation, the transverse thermal welding is performed at the same sealing timing. Activate the means. The deviation of the sealing timing may be determined by actually sealing the packaging film with the lateral heat welding means, or the distance of the photoelectric tube mark to the sealing position may be measured. Thus, when the photoelectric film mark P of the packaging film is different from the seal position, such as when the packaging film is replaced, the horizontal seal timing of the lateral heat welding means is optimized with respect to the difference between the P and the seal position before starting full-scale operation. By performing the initial setting, useless pitch adjustment operation can be omitted.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an automatic packaging machine according to the present invention and an initial setting method for the horizontal seal timing will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an external appearance of an automatic powder packaging machine according to the present invention, FIG. 2 is a longitudinal sectional view showing a driving mechanism of a main part of the automatic packaging machine, and FIG. 3 is a main part of the automatic packaging machine. FIG. 4 is a control block diagram of the automatic seal interval automatic adjustment, and FIG. 5 is a control flowchart of the horizontal seal timing. Among them, the operator's work procedure, FIG. 6 is an operation procedure viewed from the controller side in the control flowchart of the horizontal seal timing, and FIG. 7 is an explanatory diagram for correcting the horizontal seal timing.
[0010]
1 to 3, the automatic packaging machine 1 for various powders according to the present invention first guides a heat-welding packaging film F fed from a reel 11 to a long chute 2 through a tension means 12. After folding in half along the longitudinal direction and then aligning both side edges of the folded packaging film F, these side edges are joined by the heel direction heat welding means (a pair of heel seal heat rolls) 3, 3. Seal and seal with a downstream side heat welding means (a pair of heat rolls for side seals) 4 and 4 to obtain a bottomed state. The wrapping film F is fed by the pair of heel sealing heat rolls 3 and 3 rotated by a dedicated servo motor 18. The powder constantly replenished from the hopper H is sequentially introduced into the bottomed tubular packaging film F1 from the weighing plate 8 through the chute 2 by a certain amount. At each operation of the heat roller 4 for horizontal sealing, the tube-shaped packaging film F is changed from the bottomed state to the sealed state after the powder is introduced, and is sequentially cut at the horizontal sealing portion of the packaging film F2 by the rotary cutting means 7. To go.
[0011]
In the automatic packaging machine 1 having the above-described configuration, an automatic seal interval adjustment method for controlling the supply speed in the longitudinal direction of the packaging film F and performing horizontal sealing by the horizontal seal heat roll 4 with the photoelectric tube mark P ... as a target. As shown in FIG. 4 as an example, there are photoelectric tube mark pitch control means composed of a rotary encoder 15, a photoelectric tube 19, a photoelectric tube amplifier 19A, a display 16, and an input touch panel 17. Basically, the rotary encoder 15 obtains an error with respect to the signal and base point of the phototube mark P sent from the phototube 19 by the number of pulses, and a servo voltage having a magnitude corresponding to this error equivalent number of pulses. Is added to the servo motor 18 to bring the error close to zero. The rotary encoder 15 driven to rotate by the axis S2 driven from the main shaft generates, for example, 2880 pulses by one rotation of the reference point. During this time, the packaging film F is moved by one pitch of the photoelectric tube mark P. The reference is set so that the sealing heat roll 4 is driven to rotate only once. .
[0012]
Therefore, when the drive shaft S2 rotates once and the amplifier 19A receives a signal indicating the phototube mark P from the phototube 19 within the base point where the 2880 pulse generated by the rotary encoder 15 is set in the phototube amplifier 19A, Sealing that coincides with the photoelectric tube marks P is performed, and this is a setting state at the start of operation during normal operation.
[0013]
However, when the packaging film F is replaced, the pitch and the seal position of the photoelectric tube marks P ... of the packaging film during the previous operation are often different. To correct this in a short time, as shown in FIG. In addition, it is shared with the automatic seal interval adjustment device. As shown in the flowcharts and explanatory diagrams of FIGS. 5 to 7, by performing the initial setting of the horizontal seal timing, it is possible to omit a useless pitch matching operation. When the first packaging film F is put on the reel 11, the setup (number of correction pulses) feed is set to zero and the initial setting start of the horizontal seal timing is performed.サ ー ボ When the servo motor 18 is activated for the sealing heat rolls 3 and 3, the photoelectric tube 19 catches the first photoelectric tube mark P, the home position is stopped and the waiting packaging machine body is activated, and the horizontal sealing heat roll 4. The horizontal seal result and the position of the photoelectric tube mark P are determined, the deviation is measured between the closest upstream photoelectric tube mark P and the sealing timing of the horizontal seal heat roll 4, and the input touch panel 17 is used for setup feed. To correct. With this correction, the correction from the photoelectric tube mark detection timing to the horizontal seal timing by the photoelectric tube 19 is converted by the number of correction pulses by the rotary encoder 18A. That is, the horizontal sealing heat roll 4 performs the sealing operation after the correction pulse elapses after the phototube mark P is detected.
[0014]
【The invention's effect】
As is clear from the above description, according to the initial setting method of the lateral seal timing of the automatic packaging machine of the present invention, the initial setting start of the lateral seal timing before the actual operation of the automatic packaging machine, such as after replacement of the packaging film, is started. Thus, the phototube and the pitch control means are made operable, and at the same time, the wrapping direction heat welding means is actuated by activation of the servo motor to move the packaging film. When the photoelectric tube detects the photoelectric tube mark, there is a deviation between the closest photoelectric tube mark on the upstream side of the lateral heat welding means and the seal timing of the horizontal heat welding means waiting at a fixed position. The deviation is measured with a rotary encoder of the servo motor, the fixed position is stopped after the correction pulse elapses, and the transverse thermal welding means in standby is operated. If there is no deviation, the transverse thermal welding is performed at the same sealing timing. When the seal position is different from the photoelectric tube mark P of the packaging film, such as when the packaging film is replaced, the transverse direction of the transverse heat welding means with respect to the difference between the P and the seal position before entering full-scale operation Optimum initial setting of the seal timing can eliminate unnecessary pitch matching operation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of an automatic packaging machine for granular materials according to the present invention.
FIG. 2 is a longitudinal sectional view showing a driving mechanism of a main part of the automatic packaging machine.
FIG. 3 is a transverse cross-sectional view showing a drive mechanism of a servo motor and a longitudinal heat welding means of a seal interval automatic adjusting device as a main part of the automatic packaging machine.
FIG. 4 is a control block diagram of the automatic adjustment of the seal interval.
FIG. 5 is a work procedure of an operator in the control flowchart of the horizontal seal timing.
FIG. 6 is an operation procedure viewed from the controller side in the control flowchart of the horizontal seal timing.
FIG. 7 is a correction explanatory view of the horizontal seal timing.
FIG. 8 is an elevational view showing the appearance of an automatic powder packaging machine according to the prior art.
FIG. 9 shows a seal interval automatic adjusting device of the automatic powder particle packaging machine, wherein (a) is an explanatory view showing the relationship between a feed speed control cam and a microswitch, (b) (c) (d) Is an action diagram.
FIG. 10 is a circuit diagram showing a relationship between a phototube motor, a phototube, and a microswitch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automatic packaging machine 1A Machine stand 2 Molding chute 3 竪 direction heat welding means (a pair of hot rolls for heel seal)
4 Lateral heat welding means (a pair of transverse heat rolls)
7 Cutting means 15 Rotary encoder 18 Servo motor 19 Photoelectric tube F Packaging film P Photoelectric tube mark S2 Rotary encoder drive system rotary shaft

Claims (1)

Having a phototube mark with a pitch corresponding to the length of the packaged product and guiding the long heat-weldable packaging film supplied in the longitudinal direction to the molding chute to fold it in half along the longitudinal direction and align both side edges; A tube-shaped packaging film in which the combined both side edges are sealed by saddle-direction heat welding means for supplying the longitudinal direction at a predetermined speed via a servo motor that receives pitch control by a pitch control means including a phototube and a rotary encoder. The tube-shaped packaging in the bottomed state is performed by sequentially transversely sealing the tubular packaging film by the transverse heat-welding means which is disposed downstream of the saddle-direction heat welding means and driven by another driving means. The film is filled with the packaged object and sealed, and the transverse heat welded portion of the packaging film is cut by a cutting means and wrapped. The product is manufactured, and the automatic packaging of powder and fluids is performed by the above process. The longitudinal feed rate of the heat-welding means in the longitudinal direction is controlled by the servo motor to target the photoelectric tube mark. In the initial setting method of the horizontal seal timing of the automatic packaging machine that performs horizontal sealing by the lateral heat welding means, the photoelectric tube and the pitch control are performed by starting the initial setting of the horizontal seal timing before the main operation of the automatic packaging machine. At the same time, the saddle-direction heat welding means is actuated upon activation of the servo motor to move the packaging film, and when the photoelectric tube detects the photoelectric tube mark, the upstream of the lateral heat welding means If there is a deviation between the closest photoelectric tube mark on the side and the seal timing of the transverse heat welding means that is stopped at a fixed position, After measuring the pulse with the rotary encoder attached to the servo motor, stop at a fixed position after the correction pulse has elapsed, and operate the transverse heat welding means that is on standby. An initial setting method for the transverse seal timing of an automatic packaging machine, wherein the welding means is operated to enter the main operation of the automatic packaging machine.

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