JPH0329711A - Apparatus for adjusting phase of rotating body such as lateral sealer of packing apparatus - Google Patents

Abstract

PURPOSE:To reduce the packing losses due to phase shift by a method wherein before start of a packing apparatus, a differential driving motor for differential gears is brought in operation by a controller so that rotating bodies are brought back into a phase relation which has been stored in a memory circuit during the preceding operation. CONSTITUTION:A phase relation between rotating bodies Aa, Ab and Ac is stored in a memory circuit 22 of a controller 19 while a packing apparatus performs packing work properly. When the same packing work is re-started, while the packing machine is out of operation, servo-motors Ma, Mb and Mc are operated to rotate a lateral sealer 1a, a packing material transfer roller Ab and a supply conveyer Ac. The servo-motors Ma, Mb and Mc are stopped after they are operated for a time period corresponding the number of pulses previously stored in a memory circuit 22 since original point signals Sa2, Sb2 and Sc2 are output. Then, the controller 19 performs a calculation to make the rotating bodies in phase with each other regardless of the packing speed in the preceding packing operation.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention can appropriately adjust the horizontal seal position between the packaged item and several materials, or the pattern of the packaging material and the horizontal seal position, etc. in packaging operations using a packaging machine. The present invention relates to an apparatus for aligning the .

(Prior Art) Conventionally, there is a means for adjusting the phase of a packaging machine, for example, as described in Japanese Patent Publication No. 1-16740.

In this conventional device, as shown in Fig. 5, the packaging material feeding port Ab for transporting the packaging material 2 of the packaging machine and the horizontal sealer Aa for horizontally sealing the packaging material 2 are individually controlled by servo motors 30 and 30a, respectively. The packaging material feeding port roller Ab and the lateral sealer Aa are driven to rotate to align the phases of the packaging material feeding port roller Ab and the lateral sealer Aa in accordance with the operation timing of the packaging material supply conveyor 7Ac driven by the general-purpose motor 31.

With such a means, even when changing the size of the packaged object 4, packaging length, etc., the packaging material feed roller Ab and the horizontal sealer Aa are kept in a predetermined phase relation state calculated according to these packaging conditions. It has the advantage of being individually adjustable.

(Problem to be Solved by the Invention) Therefore, in the conventional means, the servo motors 30, 30
The actual situation is that various data used for the control of a are inputted with values calculated on a desk in accordance with the size of the object to be packaged 4, the length of the package, etc.

However, in actual packaging work using this box wrapping machine,
There are many cases where the packaging conditions differ from the values calculated by theoretical theory due to factors such as the elongation of the packaging material. As a result, in the past, there was a risk that a phase shift error would occur in the horizontal seal position, etc., and packaging loss would occur due to this error.

Therefore, the present invention enables proper packaging work to be performed by accurately aligning the phases of rotating bodies such as a horizontal sealer and a supply conveyor for packaged items under conditions consistent with actual packaging work, thereby eliminating phase shifts. The purpose is to reduce packaging loss caused by

(Means for Solving the Problems) The present invention aligns the timing of each part of the packaging machine before starting the operation of the packaging machine according to the actual measurement data when the packaging machine is actually operated and appropriate phase alignment is performed. It is constructed based on a completely new technical idea of ``synthesis'' and solves the above-mentioned conventional problems.

That is, the present invention provides a packaging machine in which the rotating bodies Aa, Ab... are provided to be rotatably driven via the differential gear 7"+Db..., in which each rotating body Aa. b... Output means Ma, +4b... which outputs origin signals Sa, Sb... for each rotational movement of the stage corresponding to one packaging operation, and each rotating body Aa, during operation of the packaging machine. Each of the control devices 19 is equipped with a storage circuit 22 capable of measuring the difference in output timing of the origin signals Sa, Sb... of Ab... and storing the data, and the control devices 19 each include: Each rotating body A when the packaging machine stops operating.
Rotate a, Ab... and use the phase as the origin signal Sa.
, sb..., the memory circuit 2
2, the differential motor Ha of the differential gears Da, [+17...
This is a phase alignment device for a rotating body such as a horizontal sealer of a packaging machine, which is set to be able to operate lHb...

Furthermore, in the above configuration, the present invention is provided with an output means 7 for outputting a packaging machine origin signal S every time the packaging machine is operated corresponding to a packaging operation, and the output means 7 is provided for each differential gear Da, Db. ... differential motor Ha. Mb
, Mc are constituted by servo motors, and the control device 19 controls each rotating body Aa, A during operation of the packaging machine.
The period Φa, Φb... from the output of the rotating body origin signals Sa, sb... to the packaging machine origin signal S output thereafter is measured and the measured data is stored in the storage circuit 22. and when the packaging machine stops operating, the servo motor H
a, Mb... are set to be operable for predetermined periods Φa', Φb'... calculated based on the periods Φa, Φb... This is a phase matching device.

(Function) In the above device configuration, when the packaging machine is actually operated and the phases of the rotating bodies Aa, Ab... are aligned, the rotating bodies Aa, Ab... The phase relationship of * can be stored in the storage circuit 22 of the control device 19. In addition, when starting packaging work under the same conditions as the previous packaging work, temporarily the rotating body Aa,
Even if there is a phase shift in Ab..., the control device 19 controls the differential motors Ma, Mb... of the differential gears Da, Db... before starting the operation of the packaging machine.
can be activated to restore the phase relationship of the rotating bodies Aa, Ab, . Therefore, even if the packaging operation is started, the rotational movement body Aa. No packaging loss occurs due to the phase shift of Ab....

Therefore, the rotating single-force workpiece A was returned to its original state before the start of the packaging work.
The phase relationship between a, Ab... is the optimal phase relationship when the packaging machine is actually operating, so errors will not occur as would be the case if phase alignment was performed using theoretical values on paper. .

Furthermore, in the latter structure, the phase relationship between the rotating bodies Aa, Ab, etc. that is optimal for packaging work is stored in the memory circuit 22.
When storing each rotary body Aa, Ab... in a period Φa, Φb... from the origin signal Sa, Sb... of each rotary body Aa, Ab... to the time when the packaging machine origin signal S is output, each rotary body Aa, Ab...
The phase difference and phase relationship of Ab... can be specified. Also, a predetermined period Φa+ calculated from the relevant periods Φa, Φb...
, Φb″...only servo motors Ha, Mb, Mc
Just by operating, each rotation 1 hour works Aa, Ab...
It is possible to restore the phase relationship of .

In such a case, since the period data Φa, Φb, etc. stored in the control device 19 are the phase relationships during operation of the packaging machine, they cannot be used as they are as phase relationship data values when the packaging machine is stopped; It is necessary to correct the period data to the data when the packaging machine is stopped. This data correction utilizes the interval of the origin signal S of the packaging machine, which is output separately from the origin signals of the rotating bodies Aa, Ab, etc., and adjusts the interval of the origin signal S and the period data Φa. , Φb... can be easily calculated by taking into account the ratio of

The operation of the present invention is as described above, and this will become clearer from the description of the following embodiments.

(Example) An embodiment of the present invention will be described below.

FIG. 1 (opening) shows a so-called billow packaging machine, which includes a packaging material feed roller Ab that feeds and transfers the packaging material 2 from the take-up roll 1, and a former 3 to transport the packaging material 2 into a cylinder. A picture conveyor 7 Ac into which the object 4 is carried, and a packaging material 2 enclosing the object 4 to be packaged.
This system is equipped with a total of three rotating bodies Aa, Ab, and Ac, including a horizontal sealer Aa that performs horizontal sealing and cutting. Therefore, this embodiment is based on these two rotating bodies Aa, Ab,
An example of application to phase matching of Ac will be described.

In the same figure (a), 5 is a drive motor which is the main drive source of the packaging machine, and each rotary motion body Aa, Ab is connected via a speed reducer 6.
, Ac. 7 is reducer 6
The rotation of the cam plate 10 which rotates in conjunction with the output shaft 8 of the packaging machine is detected through the gears 9 and 9a, and the rotation of the output shaft 8 corresponding to one rotation of the packaging machine, that is, one packaging work process of the packaging machine, is detected. A sensor that outputs the packaging machine origin signal S is shown.

Da, Db, and Dc are differential gears for driving the horizontal sealer Aa, packaging material feeder Ab, and supply conveyor C, respectively, and these input shafts 11a,
The 1lb and llc sides are drivingly connected to the output shaft 8 of the drive motor 5 side via bevel gears 12a+12b+12c. Ha, Mb, and Mc indicate differential servo motors for each differential gear Da, Db, and [)c.

+aa is the differential 7 rental gear Da for the side sealer Aa.
The sensor detects the rotation of the cam plate 15a attached to the output shaft side of the cam plate 15a, and outputs the origin signal Sa of the horizontal sealer Aa for each rotation operation corresponding to one packaging work process of the horizontal sealer Aa, that is, for each rotation. It is something to do. Reference numeral 16 indicates a variable eccentric mechanism for the horizontal sealer Aa, and reference numeral 17 indicates a continuously variable transmission for variable bag length of the packaging material feed roller Ab.

In addition, in the same figure (0), +4b is a register mark sensor that detects the register mark attached to each packaging unit of the packaging material 2 and outputs the detection signal, which corresponds to one packaging work process. An origin signal sb is output every time the packaging material is fed. However, in the same figure (A), the sensor for the register mark +44) detects the rotation of the cam plate 15b on the input shaft side of the packaging material feed roller Ab, and generates the origin signal sb every time the packaging material is fed by the bitch. For convenience, it is described as sensor +4b that transmits.

14c is a sensor embedded in a guide rail or the like of each of the 7 touchments 18 for pushing the object to be packaged on the supply conveyor 7Ac, and one unit of the object to be packaged 4 is fed into the packaging material 2 by the supply competition 7^C. In order to output the origin signal Sc every time the attachment 18 is detected, the detection signal Sc is output. In addition, the sensor 14c is also
In the above, the sensor 14c is described as a sensor 14c which detects the rotation of the cam plate 15c of the input shaft of the supply conveyor Ac and outputs the origin signal Sc every time one unit of the packaged object 4 is supplied.

19 is a control @ device, and if you explain the structure of the device, 20
shows a pulse generator that generates pulses of constant frequency during operation of the packaging machine, independent of the operating speed of the packaging machine. 21 is a counter that counts the number of pulses generated by the pulse generator 20 during a predetermined period to be described later;
Reference numeral 22 indicates a storage circuit that stores the count number. 23
is a control circuit such as a CPLI which calculates the data stored in the memory circuit 22 and generates predetermined signals R11R2, R3 for operating the respective servo motors Ha, Mb, and Mc.

The device configuration according to this embodiment has the above configuration, and next, an example of its usage and operation will be explained.

First, the packaging machine is actually started, and packaging operations are performed in which the packaging material 2 is transferred, the items to be packaged 4 are supplied, and the packaging materials are laterally sealed. If the rotation timings of Ab and Ac are inappropriate, each of these devices is adjusted to match the timing, and the working conditions of each rotating body Aa, ^b, ^C are set to the best condition. Each rotating body Aa,
Both Ab and Ac are differential gears Da,
Since the differential gears Da, Db... are driven and rotated through inching, the differential gears Da, Db...
The phase can be matched by adjusting the .

Next, while the packaging machine is in operation and the packaging work is being properly performed, the phase relationships among the rotating bodies Aa, Ab, and Ac are stored in the storage circuit 22 of the control device 19.

This operation will be explained with reference to FIG. 2. First, during the operation of the packaging machine, continuous pulses P0
occurs, and each sensor 71 14al 14br 1
Origin signals S, Sa, Sb, and Sc are output from 4c. In this state, the switch for starting the storage operation is turned on in the storage circuit 22 as shown in FIG. The number of pulses Φa, Φb during the period from the time when the signal Sc is output to the time when the packaging machine origin signal S2 of the sensor 7 is output thereafter
, ΦC are counted and the counted number is stored.

Next, if the packaging machine is used for another packaging operation at the end of the packaging operation in which the above settings have been performed, there will be a shift in the phase relationship of the horizontal sealer Aa, supply conveyor Ac, etc., but the same packaging operation as the previous one will be performed again. When restarting, each rotating body Aa, Ab stored in the storage circuit 22 of the control device 19
, reproduce the phase relationship of Ac. The phase relationship is reproduced while the packaging machine is stopped. After turning on the operation command signal of the control device 19 and issuing a warning such as a buzzer for a predetermined period of time as shown in FIG. 3, the servo motor Ma , Mb
, Activate Hc to open the horizontal sealer Aa and the packaging material feed port A.
b. Rotate the supply conveyor Ac. When these are rotated, each sensor 14a+141)+t4c outputs an origin signal Sa2, Sb2, Sc2, but each of the servo motors Ma, Mb, Mc outputs the origin signal Sa2, Sb2, Sc2. From the time of output of , the rotation operation is performed for periods of Φa', Φb+, and ΦC' corresponding to the previous pulse numbers Φa, Φb, and ΦC stored in the memory circuit 22, respectively, and then stopped.

Here, the number of pulses Φa, which was stored during the previous packaging operation, is
Since Φb and ΦC differ depending on the operating speed of the packaging machine, the pulse numbers Φa, Φb, ΦC and the current pulse numbers Φa', Φb1, ΦC' cannot be set to the same value. When determining the pulse numbers Φa', Φb', and ΦC', it is necessary to take into account and correct the operating speed of the packaging machine when the pulse numbers Φa, Φb, and ΦC were previously stored.

To explain this method using Figure 4 as an example, the figure (a)
In the first data storage operation, the output shaft 8 moves the horizontal sealer Aa without operating the servo motor Ha.
When the number of pulses per revolution (that is, the number of pulses at the interval of the packaging machine origin signal S in Fig. 2) is Φ, the sealer Aa changes from the origin position A shown by the two-dot chain line to the number of pulses Φa. When the lateral sealer Aa rotates for a corresponding period of time, the phase of the lateral sealer Aa is properly set. Therefore, the same figure (mouth)
When the output shaft 8 is stopped and the phase is reproduced by operating the servo motor Ha as shown in the figure, if the number of pulses required for the servo motor Ma to rotate N and to rotate the horizontal sealer Aa once is PM, then , the period Φa'' during which the lateral sealer Aa is set from the origin position HA to the same phase as in FIG.

Φa'=ΦaXPM/Φ Also, in the case of the packaging material feed roller Ab and the supply conveyor Ac, Φb' and ΦC' may be determined using the same formula as above. The calculation may be performed by the control device 22.

As a result, mutual phase alignment of the rotating bodies such as the horizontal sealer ^a can be performed regardless of the packaging speed during the previous packaging operation.

Through the above operations, the servo motors Ha, Mb, and Hc are activated to align the phases of the various parts before the packaging machine starts operating, and then the packaging machine is started and the packaging operation is performed as usual. Since the phase alignment can be performed appropriately in advance, no packaging loss occurs in the second packaging operation, and the packaging operation can be performed with high efficiency.

In addition, the horizontal sealer Aa that was memorized during the first packaging operation
, the packaging material feeding port roller ^b, and the supply conveyor 7Ac are incorrectly set, there is a possibility that the second packaging operation may not be performed in an appropriate state as well. However, in such a case, the phase relationship of each part may be appropriately set again by inching during the second packaging operation, and then the data stored in the control device 19 may be replaced with the previous data. Thereby, it is possible to appropriately avoid causing a phase shift in subsequent packaging operations.

In the above embodiment, the horizontal sealer Aa and the packaging material feed port A
Although a case has been described in which the phases of a total of three components, b and supply conveyor 7Ae are adjusted, the present invention is not necessarily limited to the phase adjustment of these two components. For example, when using plain packaging material 2, supply conveyor 7AC and horizontal sealer A
In such a case, it is not necessary to consider the phase alignment of the packaging material feeding port roller Ab, since it is only necessary to align the phase with the roller a. Of course, the present invention can also be applied to the case of phase alignment between the horizontal sealer Aa and the supply competition 7Ac.
It can be applied to phase alignment of various other rotating bodies, and the specific type of rotating bodies is not limited at all.

Further, in the above embodiment, the number of pulses generated by the pulse generator 20 is counted to identify the phase relationship of each rotary workpiece, but the present invention is not limited to this. measurement,
There is nothing wrong with processing the data to be stored in terms of time. Further, in the above embodiment, Φa' is calculated from the data Φa... based on the packaging machine origin signal S, but the method is not necessarily limited to this method, and the specific structure of the control device 19 can also be applied to the above implementation. As usual, it is not specified.

In the present invention described in the first ill claim, the control device 19 essentially controls each rotating body Aa, Ab, etc. during operation of the packaging machine.
Equipped with a memory circuit 22 that can measure the difference in the output timing of the origin signals Sa, Sb... and store the data, and also change the phase of each rotating body Aa, Ab... when the packaging machine stops operating. In order to be able to restore the relationship to the phase relationship stored in the storage circuit 22 based on the output timing of the origin No. 18 Sa, Sb, etc., the differential gears Da, Db, etc.
It is sufficient if the differential motors Ha, Mb, etc. can be operated.

Furthermore, the present invention provides origin signal output means 7, 14a+ for each part.
14b, etc., various sensors other than the above-mentioned embodiments and other switch means can be applied as appropriate, and their types are not limited.

In addition, in the present invention, the design of all specific parts such as the differential gear and its differential motor can be changed as desired within the scope of the present invention.

(Effects of the Invention) In contrast to the above-mentioned Kaba, the present invention makes it possible to output an origin signal for each rotational movement equivalent to one wrapping operation of a rotary moving body rotationally driven via a differential gear, and A control device is provided with a storage circuit capable of measuring the difference in the output timing of the origin signal of each rotating body and storing the data,
The structure is such that when the packaging machine is stopped, the control device operates the differential motors of the seven differential gears to restore each rotary working body to the same phase relationship as the one stored in the memory circuit. In addition, the state in which the packaging machine is actually operated and the phases of each rotating body are set to the best conditions can be stored in the memory circuit of the control device.
When starting the next packaging operation, the rotating body can be phase-aligned to the previously set optimal state.

As a result, according to the present invention, fluctuations in the elongation of the packaging material can be avoided, unlike the conventional method in which a servo motor is simply directly connected to the rotary motion body and the phase of each rotary motion body is adjusted based on numerical theory calculated on a desk. There is no inconvenience caused by situations that do not match the actual packaging work, and it is possible to perform phase alignment that matches the actual packaging work, with fewer errors than before, and a significant reduction in packaging loss. It has a special effect.

Furthermore, according to the present invention, if the optimal packaging operation is performed only once in advance, the phase of the rotary motion body that is optimal for the packaging operation can be repeatedly reproduced thereafter, and a predetermined numerical value can be controlled each time the packaging operation is performed. There is no need to repeatedly enter information into the device. Therefore, the device is very easy to handle and has excellent practicality.

Furthermore, when storing the phase relationship of the rotary motion bodies that is optimal for the packaging work of the present invention in the storage circuit, the phase of each rotary motion body is determined during the period from the origin signal of each rotary motion body to the time when the packaging machine origin signal is output. According to means that can specify the relationship and operate the servo motor only for a predetermined period calculated from the period to restore the phase relationship of each rotary movement body to a predetermined proper state, the rotation movement The phase can be reproduced without being affected by the operating speed of the packaging machine when specifying and memorizing the phase relationship of the body, and the phase reproduction work can be performed very accurately automatically, and its practicality is It's even bigger.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the apparatus according to the present invention, in which (A) is an explanatory view of the main part of the drive system of the packaging machine, and (opening) is a schematic explanatory view of the main body side of the packaging machine. FIG. 2 is an explanatory diagram for storing the phase relationship of rotating bodies. FIG. 3 is an explanatory diagram when reproducing the phase relationship. FIGS. 4A and 4B are explanatory diagrams showing the phase reproduction of the lateral sealer. FIG. 5 is a schematic perspective view showing a conventional example. 5... Drive motor 7... Origin signal output means of packaging machine

Claims (1)

[Scope of Claims] 1. In a packaging machine in which a plurality of rotating bodies Aa, Ab... are provided to be rotatably driven via differential gears Da, Db..., each rotating body Aa ,A
Output means 14a, 14 for outputting origin signals Sa, Sb... for each rotational movement of an amount equivalent to one packaging operation b...
b... and each rotating body Aa, Ab during operation of the packaging machine
. . are each equipped with a control device 19 equipped with a storage circuit 22 capable of measuring the difference in output timing of the origin signals Sa, Sb . . . and storing the data;
When the packaging machine stops operating, each rotating body Aa, Ab... is rotated to restore its phase to the phase relationship stored in the memory circuit 22 based on the output timing of the origin signals Sa, Sb... Differential gears Da, D to make it possible
A phasing device for a rotating body such as a horizontal sealer of a packaging machine, characterized in that differential motors Ma, Mb, etc. of b... are set to be operable. 2. In the phase alignment device for a rotating body such as a horizontal sealer of a packaging machine as set forth in claim 1, an output that outputs a packaging machine origin signal S when the packaging machine is operated for an amount corresponding to one wrapping operation. Means 7 is provided, and differential motors Ma, Mb of each differential gear Da, Db...
, Mc are composed of servo motors, and the control device 19 controls each rotating body Aa, Ab, and the like during operation of the packaging machine.
The period Φa from the output of the rotating body origin signals Sa, Sb, . . . to the packaging machine origin signal S output thereafter
, Φb... and stores the measured data in the storage circuit 22, and when the packaging machine stops operating, the servo motors Ma, M
b... is set to be operable for a predetermined period Φa', Φb'... calculated based on the periods Φa, Φb... Phase alignment device for rotating moving bodies.