JPS63281911A - Driving control method and apparatus in packing machine - Google Patents

Abstract

PURPOSE:To facilitate alignment and to obtain a beautiful package, by controlling the driving of the motor for driving a feed means and that of the motor for driving a cylindrical film sealing/cutting means on the basis of the drive motor for drawing out a strip like film. CONSTITUTION:A finger 19 is moved by the first drive motor 20 and the second drive motor 35 is connected with the rotary shaft 31 of the end sealer 30 under an end seal apparatus 5 and the third drive motor 38 is connected with a draw- out roller 9 moving a strip like film 7. The strip like film 7 is transferred at a constant speed and a detection apparatus 60 judges whether the distance between cutting marks is matched with a set value and, when there is shift within a correctable range, a control apparatus 50 controls the rotational speeds of the first and second motors 20, 35 to perform correction. When correction is impossible, the control apparatus 50 issues a stop order and the drive motors 20, 35 stop after the finger 19 and the end sealer 30 move to the reference positions. When there is no cutting marks on the strip like film 7, the first and second drive motors 20, 35 are rotationally driven on the basis of the preliminarily inputted data of a cylindrical film and the rotation of the third drive motor 38.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a drive control method and device for a packaging machine, and more specifically, to a drive control method and device for a packaging machine, and more specifically to a drive control method and a device for controlling drive motors independently arranged in each drive system of a packaging machine. This invention relates to improvements in drive control methods and devices.

(Prior Art) Conventionally, in order to manufacture a package using a horizontal billow packaging machine or other equipment, a raw film wound into a roll is pulled out as a continuous strip-shaped film, and partway through the process, it is formed into a cylindrical film. On the other hand, each article to be packaged is sequentially fed into the cylindrical film, and the cylindrical film is laterally sealed cut or twisted between the articles to produce a package. Some of the above-mentioned strip-shaped films have designs, patterns, etc. printed at predetermined intervals.

When performing packaging work using a packaging machine configured in this way, it is necessary to adjust the supply position of the packaged items and It is required that the position at which the open can is cut for sealing in the lateral direction and the timing at which the strip film is supplied are all consistent.

Conventionally, the movement from one drive motor was transmitted to all drive means using transmission means such as cams and gears, but in order to perform the various positionings described above prior to operation of the packaging machine, Each time, after canceling each transmission means and temporarily setting them, connect the transmission means and perform a trial run, check whether the conditions of each drive system match at the set position, and if the position t does not match with that setting. In some cases, the handling of the transmission method is complicated, such as deactivating and resetting it again.
Recently, systems in which each drive system is provided with an independent drive motor have been used.

That is, since they are independent, they can be driven independently, that is, change their states, regardless of the states of other drive systems, making initial settings easier. However, in order to perform the normal packaging operation reliably and smoothly once the settings have been made, it is necessary to perform some kind of control on each drive motor and operate them in synchronization. Therefore, conventionally, JP-A-61
As shown in No. 259927, the other two drive systems are controlled using the conveying device that conveys the packaged items at predetermined intervals as a reference, and the conveying device serving as the reference is operated at a constant speed. The conveyance speed of the strip film, the rotation speed of the end sealer, and the engagement timing are adjusted by detecting the interval between the cut marks.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional device, since the 1ilJ control was performed based on the conveyance device of the packaged object,
When making initial settings at the start of packaging work, the fingers of the conveyance device can be stopped at any position, and the distance from the finger stop position to the end sealing device can be calculated.
By calculating the rotation angle of the end sealer based on the distance, it is possible to align the two members, but it has been difficult to align the strip-shaped film.

That is, as mentioned above, the band-shaped film is usually printed with various designs, patterns, etc. at predetermined intervals, and the printing is matched to the packaged item and indicates the position for accurately cutting the seal. A cut mark is applied and the cut mark is detected by a detection means and set.
Since the detection means is fixed and the distance between the detection means and the end seal installation is fixed, the position of the strip film when the detection device detects the cut mark is not always the same as the initial position according to the conveyance device. If it matches the condition of the end sealer that has been set, it does not necessarily mean that the initial setting cannot be performed reliably.

In addition, during normal operation for packaging work, the conveying device is driven at a constant speed, and if the printing applied to the strip film, that is, the distance between the front and rear cut marks, differs from the set value, the strip film and end seal device Adjustment is made by changing the rotational speed of the film, but if the transport speed of the film strip is changed in this way, the tension of the film strip will not be constant and the film will meander, making it difficult to achieve a stable seal. There is a possibility that you may not be able to do so. Also, while the end sealer and film are in contact, the speed of both must be the same, so if the speed of the film changes, the rotation speed of the end sealer must be controlled accordingly. In addition, contact between the end sealer and the film is difficult.
If the I interval changes, the seal heating temperature of the end sealer must also be changed, and the f, IJ l becomes extremely complicated. Furthermore, if the strip film moves while pulsating, the cylindrical film in which the packaged items are housed will also move while pulsating, which may cause relative positional displacement of the packaged items. There is a problem.

This invention was made in view of the above-mentioned problems.
The aim is to create a packaging machine that can control independent drive motors reliably and easily, that can easily align the film, conveyor a, and end sealer, and that can produce clean packages. An object of the present invention is to provide a drive control method and device in a.

(Means for solving the problem) In order to achieve the above-mentioned object, in the first invention according to the present invention, a first drive motor that drives a conveying means of a packaging machine and a cylindrical film are sealed or cut. The second drive motor that drives the means for pulling out the strip film is controlled and driven with reference to the third drive motor that pulls out the strip film.

A second invention that can more preferably implement the first invention described above is a first drive motor that drives a conveying means of a packaging machine, and a second drive motor that drives the seal cut or cutting means. , and a control means for controlling the drive of a third drive motor that drives the means for drawing out the strip-shaped film, and a control means connected to the control means and controlling the respective positions and positions of the conveying means, the end sealing means, and the film drawing means. A detection means for detecting the state is provided, and the υ control means performs control based on a signal from the film drawing means.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an automatic packaging anchor in which the present invention is used. As shown in the figure, an end sealing device 5, which is a sealing means, is disposed in front of the conveying means 2, which conveys the packaged articles 1 at predetermined intervals, in the traveling direction. A raw film 8 in which a strip-shaped film 7 is wound is disposed above the conveyance means 2, and the strip-shaped film 7 is pulled out by a pull-out roller 9.
and the conveying means 2 via a plurality of tension rollers 10.
A bag making device 1 guided upward and placed in the center of the conveyance means 2
1 is formed into a cylindrical shape to become a cylindrical film 7', and the articles 1 to be packaged are sequentially supplied into this cylindrical film 7'. Cut marks (not shown) indicating cut positions are printed on the side edges of the strip film 7 at predetermined intervals.

Further, the conveying means 2 is disposed close to a first conveying device 15 that conveys only the object 1 to be packaged, and the output side of the first conveying device 15, and is arranged close to the first conveying device 15 that conveys only the object 1 to be packaged. and a second conveying device 16 for conveying. The first conveying device 15 includes a pair of sprockets 17 .
It is composed of an endless chain 18 installed on the chain 17', and fingers 19 arranged at predetermined intervals on the endless chain 18. Further, a first drive motor 20 is connected to one sprocket 17 via a power transmission mechanism such as another sprocket or a chain, and this first drive motor 20 can move the endless chain 18, that is, the fingers 19. It looks like this. In addition, the second conveying device 16 has a pair of rotating rollers 25 and 25 disposed below near the input side of the cylindrical film 7' in contact with each other. The cylindrical film 7' can be transported forward by rotating the overlapping end portion 7'a while pinching it from both sides.
That is, a center sealer 28, 28 for sealing the overlapping end rA7'a of the tubular film 7' is disposed at the front in the traveling direction of the tubular film 7'.

The end seal device 5 also includes a pair of upper and lower end sealers 30.30, and the end sealers 30.30 are equipped with a gear 32.30 fixed to an end of a rotating shaft 31.31.
32 are designed to mesh with each other, so that they can rotate in synchronization. Further, a second drive motor 35 is linked to the rotating shaft 31 of the lower end sealer 30 via a power transmission means, so that it can be driven to rotate.

Furthermore, a third drive motor 38 is connected to the pull-out roller 9 for moving the strip film 7 via a power transmission means. This third drive motor 38 is connected to the above-mentioned rotary 0-ra 25 and center sealer 2.
8 are connected to each other so that they can rotate in synchronization with the pull-out roller 9.

Furthermore, in this embodiment, a carry-out conveyor 45 is disposed on the carry-out side of the end sealers 30, 30 to carry out the package 40 finally manufactured by the end sealers 30, 30.

Here, in the present invention, the above-described first to third drive motors 2
0.35.38 is 3 in the control device 50! ! ! are connected to each other, and each drive motor 20 is controlled by a signal from the control device 50.
, 35.38, the rotational speed can be increased or decreased. That is, the rotation speed of the third drive motor 38,
In addition, based on data such as the cut dimensions of the partial film 7', the control device 50 controls the first. Second drive motor 20.
The reference rotation speed of No. 35 is calculated, and that value is used as the reference number of No. 35. is sent to the second drive motor 20, 35, and both drive motors 20
．． 35 is designed to rotate. In other words, the first. The second drive motor 20, 35 is synchronized with the third drive motor 38 via the control device 50, in that sense the third drive motor 38 is synchronized with the first. This serves as a reference for synchronization of the second drive motors 20 and 35. Further, a first encoder 51 is coaxially attached to the sprocket 17 to which the first drive motor 20 of the first conveyance device 15 is connected. A first position detecting device 52 is disposed adjacent to the first encoder 51, so that the rotation speed and rotation angle of the sprocket 17 can be detected. Further, the first position detection device 52 is capable of detecting when the finger located at the forefront end has come to a predetermined position (reference position).

Similarly, a second encoder 54 and a second position detection bag [55] are also installed on the rotating shaft 31 of the lower end sealer 30.
is arranged so that the rotation angle of the end sealer 30 can be detected.

Further, a third encoder 57 and a third position detection device 58 are disposed coaxially on the drawer 0-ra 9,
The rotation angle of the pull-out roller 9 from the reference position can be detected. Further, a detection device 60 for detecting cut marks made on the side edge of the strip-shaped film 7 is disposed close to one end of the side peripheral surface of the pull-out roller 9. Furthermore, between the center sealer 28 and the end sealer 30 provided in the second conveyance device 16, there is a cut mark made on the strip film 7 (here, the cylindrical film 7') similarly to the detection device 60. An auxiliary detection device 61 is provided to detect.

And the above-mentioned first to third position detection devices 52.55
．． 58. Information from the detection device 60 and the auxiliary detection device 61 is input to the control device 50, and based on the input data, each drive motor 20°35.38! 11 is controlled.

Further, in this embodiment, phototubes are used as various detection devices.

Next, a second invention of the control method according to the present invention will be explained based on the above-mentioned device using the flowchart shown in FIG.
Fixed data such as the finger pitch, sealing width and radius of the end sealer, and variable data such as the dimensions and height of the packaged object 1 and the cut dimensions of the film are input. and,
After entering the data, perform the initial settings. This initial setting is based on the finger 19 of the first conveying device 15. The work of moving the positions of the cut marks made on the end sealer 30 and the strip film 7 to the reference position, and the operation of moving the cut marks made on the end sealer 30 and the strip film 7 to the reference position, and the operation of the finger 19 based on the input data after moving to the reference position.
, the operation of moving the end sealer 30 and the strip film 7 to optimal positions where they coincide with each other, and specifically, consists of the following operations. First, finger 19
It moves forward until it is detected by the first position detection device 52, that is, until it moves to approximately the same position as the input end of the bag making machine 11, and then stops. On the other hand, in the end seal opening 5, the upper end sealer 30 faces upward, and the lower end sealer 30 faces downward. In other words, the positions facing each other when seal-cutting the cylindrical film 7' are used as reference points. Rotate until each position is rotated 180 degrees. The state of the end sealer 30, 30 is detected and controlled by a second encoder 54 and a second position detection device 55. Next, the strip-shaped film 7 is set so that the cut mark on the strip-shaped film 7 moves around the detection device 600 disposed close to the pull-out roller 9. That is, until the detection device ff160 detects the cut mark, the third
The drive motor 38 operates to rotate the pull-out roller 9, and after detection, it is stopped. This completes the work of moving it to the reference position. Next, since the distance from the position of the detection device 60 to the end sealer 30.30 is constant, when the end sealer 30 is in the initial state based on the cut dimension input as variable data, the end sealer 30 and the detection HM 60. Calculate how many cut marks there are between the two and the distance from the last cut mark to the detection device N60. Then, as shown in the calculation result, the third drive motor 38 is operated while controlling the rotation speed and rotation angle of the pull-out roller 9 using the third position detection device 58 to move the strip film 7 to the calculated position. Transport forward. Similarly, the position of the finger 19 of the first conveying device 15 is determined by how much it should be moved back and forth from the reference position, and according to the result, the position of the finger 19 of the first conveyance device 15 is controlled by the first position detection device 52, etc. Drive motor 20 is operated to move finger 19 to an appropriate position. This completes the initial settings. Note that in this embodiment, the auxiliary detection device 61 is used to enable more accurate initial settings.
has been established. That is, due to the expansion and contraction of the film itself and the movement of the tension roller 10, strictly speaking, the detection device 6
Since the distance from 0 to the end sealer 30 deviates from the set value, the pull-out roller 9 must be rotated from the time when the cut mark is first detected by the detection device 60 until the cut mark is detected by the auxiliary detection device 61. The distance between the two is actually measured, and the auxiliary detection device fffi6 is applied to the measured value.
1 and the distance to the end sealer 30 is set as the actual distance between the end sealer 30 and the detection device 60, and the above initial setting is performed.

Next, it is determined whether the initial settings have been properly performed or not, and once it is confirmed that the initial settings have been correctly performed, normal packaging work is started. However, the distance between the cut marks preprinted on the strip film 7 may differ from the set value due to printing errors or expansion/contraction of the film itself. Therefore, in this embodiment, the gate where the packaging work is performed also constantly monitors the cut marks made on the strip film 7, and if the cut marks differ from the set values, the first transport device 15 and The operating speed of the end seal device 5 is adjusted. That is, first, the strip film 7 is transported at a constant speed, and the detection device W60 determines whether the distance between the cut marks is as set as the set value. In the case of a deviation in the joint rotation that can be corrected even if it differs from the above, the deviation length is input to the control device 50, and the control device 50 adjusts the rotation of the first and second motors 20 and 35 according to the value. Correction is made by adjusting the speed. That is, if the distance between the cut marks is longer than the set value, the distance between the articles 1 to be packaged to be fed into the opening film 7' must be increased, so the conveying position of the first conveying device 15 is slowed down. At the same time, the meshing timing of the end sealer 30 is also delayed. That is, the speed of the second drive motor 20.35 is reduced by the first degree.

Furthermore, if the distance between the cut marks is short, the correction is performed by performing the opposite action to the above. The distance between such cut marks is constantly monitored during packaging work. That is, it is always determined whether or not the stop button is pressed, and the above-described monitoring and correction operations are repeated unless the stop button is pressed. On the other hand, if the deviation from the set value is such that it cannot be corrected, a stop command is issued. Then, as described above, if the stop button is pressed or if a stop command is issued due to a difference in the distance between the cut marks, the packaging operation will be completed and each drive motor will stop. 1. The second drive motor 20゜35 does not stop immediately and moves the finger 19 as well as the end sealer 30.
It moves until it reaches the above reference position and then stops. This completes all work and prepares for the next work.

In addition, if there are no cut marks on the strip film 7, that is, if there are no designs printed at predetermined intervals, perform the initial settings described above, move the finger 19, etc. to a predetermined position, and then input the information in advance. The first and third drive motors 20 and 35 are driven to rotate based on the rotation of the third drive motor 38 based on data such as the cut dimensions of the cylindrical film. After the stop button is pressed, the fingers 19 and the like move to the reference position and then stop as described above. However, since there is no need to monitor the cut marks during packaging operations,
They perform packaging work.

Note that the present invention is not limited to the embodiments described above; for example, the means for transmitting the drive motor may be a timing belt or a direct gear, and the position detecting device may be a micro switch, a proximity switch, etc. Various types can be used. Further, it is possible to carry out more accurately by providing an auxiliary detection device, but it is not necessary.

Further, in the above embodiment, a so-called horizontal pillow packaging machine has been described, but it goes without saying that the present invention can also be used in a packaging device a or the like constructed with a similar drive means.

In addition, in the above embodiment, it is assumed that the strip film is transported at a constant speed, but this does not have to be strictly the same speed. It's okay to change.

(Effect of the invention in Song Dynasty) As described above, according to the method and packaging of the present invention,
Each independent drive motor can be reliably and easily.
Moreover, the positioning of the eight stems can be easily performed, and the package can be manufactured neatly.

Furthermore, since the strip-shaped film is fed at a substantially constant speed, there is no risk that the film will pulsate and meander. Furthermore, since the contact time between the cylindrical film and the end sealer is constant, the heating temperature of the end sealer can also be kept constant, making control easier.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a preferred embodiment of the device of the present invention;
FIG. 2 is a plan view thereof, and FIG. 3 is a flowchart explaining the invention in detail. 1... Item to be packaged 2... Conveying means 5-...
End sealing means 7... Band-shaped film 7'... Tubular film 9... Pull-out roller 11... Bag making device 15... First conveying device 16... Second conveying device 20. ...First drive motor 35...
-Second drive motor 38...Third drive motor 50
...control m+equipment 52...first position detection device 55.
...Second position detection device C58...Third position detection device 60...Detection device Fig. 3

Claims (2)

[Claims] (1) A means for pulling out a strip-shaped film at a substantially constant speed to form a cylindrical film, a conveying means for conveying the object to be packaged and sequentially feeding it into the cylindrical film, and a means for horizontally moving the cylindrical film at a predetermined position. In a packaging machine having a seal cut or a means for cutting in a direction, a first drive motor that drives the conveying means and a second drive motor that drives the seal cut or cutting means are connected to a first drive motor that drives the seal cut or cutting means. A method for controlling a drive in a packaging machine, characterized in that the control drive is performed based on the drive motor of No. 3. (2) A means for pulling out a strip film to form a cylindrical film, a conveying means for conveying the packaged object and sequentially feeding it into the cylindrical film, and a seal cut in a lateral direction at a predetermined position of the cylindrical film. Alternatively, in a packaging machine having cutting means, a first drive motor drives the conveying means, a second drive motor drives the seal cutting or cutting means, and a second drive motor drives the means for pulling out the strip film. A control means for controlling the drive of the drive motor of No. 3, and a detection means connected to the control means and detecting the positions and states of the conveying means, the end sealing means and the film drawing means, and Drive control in a packaging machine, characterized in that the control means controls the driving of the first and second drive motors based on a signal from a detection means that detects the position and state of the film drawing means. Device.