JP7174401B2 - Form-fill-seal machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a form-fill-seal machine, and more particularly to a form-fill-seal machine capable of correcting deviations in accumulation of registration marks along the length of a plurality of bags extending from a registration mark sensor to an end sealing device.

Conventionally, products to be packaged are sequentially fed into a packaging material such as a film that is formed into a tubular shape by a cylinder making machine, and both longitudinal side edges of the tubular packaging material enclosing the products are supplied. A form-fill-seal machine for forming horizontal pillow packages that applies vertical seals (center seals) to the superimposed surface, and then applies horizontal seals and cuts (end seals) before and after sandwiching a tubular packaging product. Widely known.
This bag-making, filling and packaging machine has various operating mechanisms such as a product supply device consisting of a conveyor that supplies the product, a raw roll that feeds the packaging material, a center seal roll, and an end seal device that seals the end of the packaging material. (see Patent Document 1, for example).

As shown in FIG. 11, a printed pattern D is printed at intervals corresponding to the bag length L on the belt-shaped film Fw used in the bag making, filling and packaging machine. A registration mark RM, which is a reference point for the length L of the bag, is printed.
In addition, deviations in the pitch of the registration marks may occur due to printing misalignment during manufacture of the packaging material, elongation of the packaging material in the film feeder, and the like.

Accumulation of this misalignment in the pitch of the registration mark RM results in misalignment of the cutting position. At the point when it is noticed, the shift is corrected by pressing the phase correction push button or the like on the control panel, that is, the shift is corrected by manual correction.

Here, if the bag is manufactured only by setting the length L of the bag, the cut position with respect to the printed pattern D will be shifted. In this case, the position of the printed pattern D is corrected by correcting the phase difference between the registration mark sensor and the end seal device.

Similarly, the phase difference between the film feeding device and the package P feeding device is also corrected.
When the package P is supplied with the phase difference between the film feeding device and the feeding device uncorrected, the phase difference between the film feeding device and the feeding device is not appropriate, so the bag length L is normal and the position of the printed pattern D is normal, the positional relationship between the supplied package P and the packaging material may be misaligned.
In this case, the position of the package P is corrected by correcting the phase difference between the film feeding device and the supply device.

As described above, by setting the basic setting values in the form-fill-seal packaging machine and further correcting the phase difference between the supply device, the film feeding device, and the end sealing device, the form-fill-seal packaging machine can: It is possible to manufacture a normal pillow package in which the items to be packaged are properly accommodated.

JP 2013-112383 A

By the way, in packaging materials such as films used in bag-making, filling and packaging machines, packaging materials manufactured in a state in which printed patterns and registration marks are applied using manufacturing rolls are transferred from the manufacturing rolls to bag-making and filling. The printing pitch itself may change due to the expansion and contraction of the packaging material when winding it on the original roll for the packaging machine. Print misalignment occurs in units.

Therefore, since the distance from the registration mark sensor that detects the registration mark of the horizontal pillow package to the end sealing device is long, a deviation of a few tenths per millimeter per bag becomes an accumulated error of several times the number of bags, and at the position of the end sealing device The deviation is in millimeters.
As a result, the cutting position (cutting position by the cutter) for manufacturing the horizontal pillow package body is misaligned, so it is necessary to frequently correct the misalignment of the cutting position.
Here, if there is an accumulated error, there is a problem that a horizontal pillow packaging body in which the printed pattern is gradually misaligned is produced, and depending on the state of misalignment, it may become a defective product.

However, in the form-fill-seal machine disclosed in Patent Document 1, a control device having an initial phase difference correction unit corrects the phase difference to correct the position of the print pattern. However, as described above, it does not correct the accumulated error of positional deviation over a long distance from the registration mark sensor to the end seal device, and therefore the accumulated error cannot be corrected.

In addition, in the conventional manual correction in which the operator visually checks the deviation of the cutting position due to the positional deviation of the printed pattern and corrects it by pressing the phase correction push button on the control panel when the deviation of the cutting position is noticed, In addition to the problem that the response is slow due to the difference, there is also the problem that the judgment of the deviation of the cut position is different and not unified.

SUMMARY OF THE INVENTION An object of the present invention has been proposed to solve the above-described problems. It is an object of the present invention to provide a form-fill-seal machine capable of correcting accumulated positional errors.

In order to solve the above-described problems, the form-fill-seal machine of the present invention pulls out from a raw fabric roll a packaging material to which registration marks for alignment are attached corresponding to the unit of the bag, and feeds the packaging material in a predetermined manner. a packaging material feeding device that feeds downstream by a feeding amount of the packaging material per bag at a speed; an end seal device for cutting; a registration mark detection device arranged upstream of the end seal device and detecting passage of the registration mark at a predetermined detection position;
A form-fill-seal and packaging machine comprising a control device that controls the operation of each device,
The control device includes a cumulative error correction unit that adjusts the feeding amount of the packaging material,
The interval between the registration marks is defined as a pitch, the preset pitch is defined as a reference pitch, the pitch detected by the registration mark detection device is defined as a detection pitch, and the difference between the detection pitch and the reference pitch is defined as a positional deviation amount. when
The packaging material feeding device feeds the packaging material downstream by the detection pitch,
The cumulative error correction unit obtains an average value of the most recently calculated positional deviation amounts, and if the average value exceeds an allowable amount, an error exists between the registration mark detection device and the end seal device. Multiply the number of bags to be packed by the average value to obtain the cumulative error, adjust the packaging material feeding speed when feeding the next pitch so that the cumulative error disappears , and after feeding the pitch It is characterized by having a speed adjustment function to restore the packaging material feeding speed of the above .

The bag filling and packaging machine according to the present invention is configured as described above, and the control device is provided with a cumulative error correction section having a feeding speed adjustment function. The packaging material feeding speed can be adjusted by a value obtained by multiplying the number of bags between the detection device and the end sealing device, thereby correcting the packaging material feeding amount.
As a result, it is possible to eliminate cutting deviations due to accumulated positional deviation errors, thereby eliminating the need for the operator to frequently correct the cutting position, thereby improving workability.

1 is a side view showing an embodiment of a form-fill-seal machine according to the present invention; FIG. FIG. 2 is a plan view of the form-fill-seal packaging machine taken along the line II in FIG. 1; The relationship between the packaging material unwound from the raw fabric roll and the pitch between the registration marks in the above embodiment is shown, and FIG. FIG. (B) is a diagram showing a state where the pitch between detected registration marks is 20 points. FIG. 10 is a diagram for explaining the relationship between a bag having a reference pitch between registration marks and a bag having a short pitch between registration marks when the packaging material of the embodiment is fed at a constant speed, and FIG. FIG. 1B is a diagram for explaining a state in which a pitch bag and a bag with a short pitch are detected by the register mark sensor. FIG. 4 is a diagram showing one means for measuring the pitch between registration marks of adjacent bags in the embodiment; 3 is a block diagram showing a control device of the form-fill-seal packaging machine of the embodiment; FIG. 4 is a flow chart for correcting the cumulative pitch deviation of the bag from the registration mark detection position to the end sealing device in the embodiment. FIG. 5 is a side view showing a second embodiment of the form-fill-seal machine according to the present invention; FIG. 10 is a diagram showing one means for measuring the pitch between registration marks of adjacent bags in the second embodiment; FIG. 9 is a block diagram showing a control device of the form-fill-seal machine of the second embodiment; FIG. 10 is a partial perspective view showing a pattern and a registration mark marked on a belt-like packaging material fed out from a material roll in a conventional form-fill-seal and packaging machine.

EMBODIMENT OF THE INVENTION Below, embodiment of the form-fill-seal packaging machine based on this invention is described with reference to drawings.
During normal operation of the bag-making, filling and packaging machine (hereinafter simply referred to as the packaging machine) M of the present embodiment, the belt-shaped packaging material Fw fed from the original fabric roll Fr ends at a preset constant film feeding speed. When the belt-shaped packaging material Fw is sent to the sealing device 3 side, if the pitch between the registration marks attached to the band-shaped packaging material Fw is maintained at the reference pitch, no positional deviation occurs between the registration marks, and therefore the end sealing device. There is no deviation of the cut position due to the cutter of 3.

However, as described above, for some reason, the belt-shaped packaging material Fw unwound from the raw material roll Fr has a print deviation of several tenths of a millimeter per bag between registration marks corresponding to the length of the bag. There is Therefore, since there are a plurality of bags between the registration mark sensor 20, which is a registration mark detecting means for detecting the registration mark RM, and the end sealing device 3, a deviation of a few tenths per bag is an accumulated error of the number of bags. As a result, there is a deviation of several millimeters at the position of the end seal device.

In the case described above, the packaging machine M of the present embodiment can correct the cumulative error of print misalignment occurring between a plurality of bags existing between the position of the registration mark sensor 20 and the end sealing device 3. It is configured to allow

First, based on FIGS. 1 and 2, the overall outline of the packaging machine M will be described.
The packaging machine M forms the band-shaped packaging material Fw fed out from the original fabric roll Fr into a tubular shape by means of a cylinder making device 22 arranged downstream of the original fabric roll Fr, and the tubular packaging material Ft is fed downstream. A film feeding device 2 which is a feeding device for conveying packaging materials, a product supply device 1 which feeds products P to be packaged into tubular packaging materials Ft at regular intervals, and tubular packaging materials Ft containing products P inside. and an end sealing device 3 having a cutter for applying end seals in a transverse direction between adjacent products P, P and cutting the cylindrical packaging material Ft in the middle of the end seals. ing.
In the cylinder making device 22, the belt-shaped packaging material Fw is formed into a substantially closed curved shape, so that the product P is placed inside the substantially closed curved packaging material on the exit side of the cylinder making device 22. It is sent out together with the packaging material.

The product supply device 1, the film feeding device 2 and the end sealing device 3 are separately driven by servo motors as described below, and a control device 4 controls these devices 1, 2 and 3 to predetermined positions relative to each other. They operate synchronously while maintaining the phase difference.
By such drive control, a vertical seal is applied to the belt-shaped packaging material Fw on which a printed pattern similar to the printed pattern D is repeatedly applied in the feed direction corresponding to the bag to be manufactured, and the printed pattern is printed on the bag. A bag is manufactured so that it appears in the correct position, and a pillow package Bp is manufactured in which the product P is stored in the bag thus manufactured.

The film feeding device 2 comprises a paper feeding roller 21 having a pair of rollers 21a and 21b driven by a film feeding servomotor SM2A, and a paper pulling roller 23 arranged downstream of the paper feeding roller 21. configured as follows. The pair of rollers 21a and 21b rotate in opposite directions to feed the belt-shaped packaging material Fw downstream.
These rollers 21 and 23 constitute a paper feed mechanism 25, and the paper feed mechanism 25 feeds the belt-shaped packaging material Fw drawn out from the original fabric roll Fr to the downstream side. . Further, the fed belt-shaped packaging material Fw is molded into a substantially cylindrical shape by the cylinder forming device 22 as described above.

A registration mark sensor 20 (FIGS. 1 and 2), which is a registration mark detecting device for detecting a registration mark RM which will be described in detail later, is provided in the vicinity of the paper feeding roller 21 of the film feeding device 2. FIG.

The paper pulling roller 23 comprises a pair of left and right rollers 23a and 23b driven by a film feeding servomotor SM2B. The cylindrical packaging material Ft is fed downstream by sandwiching the parts and rotating in opposite directions.

A center sealing device 24 is arranged downstream of the paper pulling roller 23 .
The center sealing device 24 superimposes both widthwise ends of a substantially curved packaging material delivered from the tube making device 22 and performs center sealing to form a tubular packaging material Ft. there is
Further, the center sealing device 24 comprises a pair of left and right sealing rollers 24a and 24b driven by a film feeding servomotor SM2C.
While these sealing rollers 24a and 24b rotate in opposite directions, both side edges of the cylindrical packaging material Ft are sandwiched between the peripheral surfaces of the sealing rollers 24a and 24b to perform center sealing. The cylindrical packaging material Ft is conveyed downstream.

The product supply device 1 is composed of a supply conveyor provided with an endless chain 12. Pusher attachments 11 for pushing the rear part of the product P to convey it are attached to the endless chain 12 at predetermined intervals.
The endless chain 12 is wound around sprockets 14, 14 arranged at the front and rear ends in the conveying direction. The sprocket 14 is driven to rotate.

In the product supply device 1, the pusher attachment 11 conveys the product P while pushing it, and feeds the product P into the product transfer position below the cylinder making device 22. As shown in FIG. Further, the product supply device 1 includes a supply origin sensor 10 for detecting the pusher attachment 11, as shown in FIG.

Near the end seal device 3, there is an end seal device origin sensor 30 (FIGS. 1 and 2) for detecting the most spaced and horizontal center position occupied when the heater blocks 31a and 31b stop. are placed.
In addition, as described above, the cylindrical packaging material Ft containing the product P is provided with an end seal Se in a transverse direction between the adjacent products P, and an intermediate end seal Se is provided. The cylindrical packaging material Ft is cut by a cutter (not shown) of a cutter device 50 (see FIG. 6) built in the heater blocks 31a and 31b.
Each bag cut by the cutter is manufactured as the pillow bag body Bp.

Next, the overall operation of the packaging machine M constructed as described above will be described.
As described above, the control device 4 of the packaging machine M receives signals from the supply origin sensor 10, the registration mark sensor 20, and the end sealing device origin sensor 30, and operates the supply conveyor driving servo motor SM1 of the supply device 1. , film feeding servo motors SM2A, SM2B, and SM2C for driving the paper feeding roller 21, the paper pulling roller 23, and the center sealing device 24 of the film feeding device 2, respectively, and the drive for vertically moving the heater blocks 31a, 31b. The drive motor SM3A and the drive motor SM3B for moving forward and backward are controlled with timing, and the respective devices 1 to 3 are operated in synchronization while maintaining a predetermined phase difference with each other.

When the packaging machine M is operated, the control device 4 exchanges information with the storage device 5 and the operation/display device 6 individually or mutually.
When a pillow bag package Bp is to be manufactured using the packaging machine M, basic setting values such as the length of the bag to be manufactured are input from the operation/display device 6 and set to the machine. , corrects the phase difference between the end sealing device 3 and the product feeding device 1 .

In the initial state, the supply device 1, the film feeding device 2 and the end sealing device 3 are stopped at their respective reference positions.
That is, the stop position of the film feeding device 2 is the position where the registration mark sensor 20 detects the registration mark RM printed on the belt-shaped packaging material Fw.
The stop position of the end seal device 3 is the position where the end seal device origin sensor 30 for detecting the heater block 31a when the heater blocks 31a and 31b occupy the most spaced position and the center of horizontal movement is turned on. The stop position of the product supply device 1 is the position where the supply origin sensor 10 for detecting the pusher attachment 11 is turned ON.
After the above preparatory steps are completed, the normal operation of manufacturing the pillow packages Bp by the packaging machine M is started.

By the way, in the band-shaped packaging material Fw such as a film used in the packaging machine M, as shown in FIGS. The pitch between RMs is not always constant.
As described above, when the packaging material manufacturing roll is wound onto the original fabric roll Fr for the packaging machine M, the pitch between the registration marks is affected by the expansion and contraction of the packaging material, etc. In some cases, the original fabric roll Fr may be wound up in a state of different dimensions with respect to the original fabric roll Fr.
In that case, the pitch between the registration marks of the band-shaped packaging material Fw such as a film fed out from the raw fabric roll Fr may also differ from the reference pitch.

For example, as shown in FIG. 3A, the pitch between the registration marks used during normal operation is a reference pitch P preset to, for example, 100 mm, and the actual detection by the registration mark sensor 20. There is a detected pitch P1, which is a pitch.
In the embodiment, the detection pitch P1 is 99.9 mm, which is the pitch between the registration marks shorter than the reference pitch P of 100 mm by 0.1 mm.

Therefore, since the distance from the registration mark sensor 20 that detects the registration mark RM of the horizontal pillow package Bp to the end sealing device 3 is long, each bag has a deviation of several tenths of a millimeter, for example, the above 0.1 mm. If there are 20 bags with misalignment, the misalignment from the position of the registration mark sensor 20 indicated by the bag number <21> to the position of the end seal device 3 indicated by the bag number <1> is shown in FIG. As shown, the cumulative error is 0.1 mm times the number of bags, and the position of the end seal device 3 is 2 mm.
3(A) shows a case of normal operation in which the packaging material is fed from the position of the registration mark sensor 20 to the position of the end sealing device 3 at the reference pitch P. As shown in FIG.
In FIG. 3A, <21> to <1> written from the registration mark sensor 20 to the position of the end seal device 3 indicate the number of measurements made by the registration mark sensor 20. FIG.

4A and 4B show the case where the bag is detected by the registration mark sensor 20 from the position of the registration mark sensor 20 to the position of the end sealing device 3 at a reference pitch of 100 mm, and the actual bag as described above. A comparison of the detected speed with the detected short dimension detection pitch P1 is shown.

The feeding of wrapping paper such as film is determined by the length of the bag and the wrapping capacity (the number of revolutions of the motor). , the wrapping paper is sent at a reference pitch of 100 mm .
Therefore, the registration marks RM should also appear at a pitch of 100 mm, and the signals should appear in units of one second. This state is shown in FIG. 4(A).

On the other hand, as shown in FIG. 4B, when the pitch of the wrapping paper is shorter (99.9 mm) than the reference pitch (100 mm), the detection pitch P1 between the actually detected marks is constant. Assuming that the film is fed at a detection pitch (99.9 mm) at a wrapping paper feeding speed of 100 mm/sec, the position of the registration mark RM moves 0.1 mm from the position of the reference pitch every 0.999 sec. become insufficient.

As described above, when the position of the registration mark RM is insufficiently moved from the position where it should be after, for example, 20 measurements by the registration mark sensor 20, the controller 4 controls the film feed servo motor SM2A and the like. The film feeding speed, which is the packaging material feeding speed, is controlled to align the position of the registration mark RM with the position of the end sealing device. can.
The reference pitch is the longest pitch of the band-shaped film Fw unwound from the film roll Fr at the beginning of use, which the operator displays on the screen of the operation/display device 6 (see FIG. 6) of the control device 4. is set to

FIG. 5A shows the sensor output signal for calculating the length of the reference pitch P between the registration marks RM and the feedback pulse of the servomotor, and FIG. 5B shows the detection pitch between the registration marks RM. The sensor output signal and servo motor feedback pulses for calculating the length of P1 are shown.
As can be read from FIGS. 5A and 5B, the number of feedback pulses at the reference pitch P is calculated to be larger than the number of feedback pulses at the detection pitch P1. can be calculated.

FIG. 6 is a block diagram showing the details of the control device 4 that corrects the amount of positional deviation.
In FIG. 6, the signal lines in the control device 4 are for explaining the main connection relationships (flow of control signals) in the present invention, and do not show strict connection relationships.

As shown in FIG. 6, the control device 4 includes an error calculator 40 for calculating the amount of positional deviation. there is
The registration mark interval value calculation function is based on the packaging material feed amount such as the belt-shaped film Fw fed by the film feeding device 2 each time the registration mark RM passes the detection position, that is, the position of the registration mark sensor 20. This is a function to calculate the registration mark interval value.
Further, the positional deviation amount calculation function is a function for calculating the difference between the registration mark spacing value and the registration mark spacing value to be calculated next as the amount of positional deviation.

A signal is output from the registration mark sensor 20 to the error calculation unit 40 for use in calculating the positional deviation using the registration mark pitch P1 detected by the registration mark sensor 20 .
Further, the movement amount is fed back to the error calculation unit 40 as a pulse signal from the film feeding servo motors SM2A, SM2B, and SM2C for controlling the film feeding speed.
The positional deviation amount calculated by the registration mark interval value calculating function and the positional deviation amount calculating function is stored in the storage unit 5 by the storage processing function of the error calculating unit 40. there is

The control device 4 includes an immediate error correction section 41 for immediately correcting the amount of deviation calculated by the error calculation section 40 according to the amount of deviation, and an accumulation correction section 41 for correcting the average amount of deviation between a plurality of registration marks. and an error correction unit 45 .

The immediate error correction unit 41 has a displacement determination function 42 that compares the positional displacement amount calculated by the error calculation unit 40 with a preset positional displacement amount. If the amount of deviation is greater than the large allowable amount, which is the amount of deviation set in advance, an alarm is stopped as an abnormality in paper feeding, or an error in detection of the registration mark sensor 20 is issued.
Here, the large allowable amount is set to 10% of the bag length in the embodiment. That is, for example, if the bag length is 100 mm, 10% of it is 10 mm.

Then, as a case where the correction by the immediate error correction function 43 is executed, for example, the belt-shaped film Fw that should be fed from the original roll Fr slips and is not fed normally. In some cases, the amount of deviation does not exceed 10 mm.
In this case, correction is made immediately, and after correction, the strip film Fw is fed at the same speed as the film feeding speed before correction.

Immediate correction of the positional deviation by the immediate error correction function 43 is performed by outputting a signal from the immediate error correction function 43 to the film feeding control section 49 of the control device 4, and controlling the film feeding control section 49. The servo motors SM2A, SM2B, and SM2C are driven to adjust the film feeding speed.

In parallel with the correction by the immediate error correcting section 41, the cumulative error correcting section 45 corrects.

That is, the cumulative error correction unit 45 has a deviation average value calculation function 46 that calculates the average value of the positional deviations based on the most recently calculated amounts of the plurality of positional deviations, and the deviation average value calculation function 46 calculates It has a deviation determination function 47 for determining the average value of the positional deviations and an accumulated error correction function 48 for correcting the positional deviations.

As described above, the average displacement calculation function 46 calculates the average value of positional displacement based on the most recently calculated amounts of the plurality of positional displacements, and corresponds to, for example, twenty bags. After calculating the total deviation amount of the pitch between the registration marks, the total deviation amount is divided by 20 to obtain the average deviation amount.
That is, if the deviation of the pitch between adjacent registration marks is, for example, 0.1 mm, the total deviation of 20 registration marks is 0.1×20=2 mm, but the average value is 0.1 mm. becomes.

A deviation determination function 47 determines the amount of deviation from the average calculated value obtained by the deviation average value calculation function 46 in the cumulative error correction unit 45, and the deviation is corrected by the cumulative error correction function 48. .

Immediate correction of the positional deviation by the cumulative error correction function 48 is performed by outputting a signal from the cumulative error correction function 48 to the film feeding control section 49 of the control device 4, and controlling the film feeding control section 49. The servo motors SM2A, SM2B, and SM2C are driven to adjust the film feeding speed.

As shown in FIG. 6, the end seal device servomotor SM3 is connected to the control device 4, and the end seal device 3 is driven by controlling the servomotor SM3.
Furthermore, a cutter device 50 is connected to the control device 4, and the control device 4 cuts the lengthwise central portion of the adjacent seal portions of the bag sent to the position of the end sealing device 3 by the cutter device 50. A cutter (not shown) is used to cut and complete the pillow bag body Bp.

Next, based on FIG. 7, the flow of correcting the accumulated positional deviation of a plurality of bags existing between the position of the registration mark sensor 20 and the end sealing device 3 by the control device 4 will be described.

When the correction of the misalignment of the belt-shaped packaging material Fw unwound from the raw material roll Fr starts, first, in step (ST) 1, the error calculation unit 40 calculates the sensor output signal output by the registration mark sensor 20 and the registration mark sensor. A detection pitch P1 calculated by counting the number of pulses output from the servo motor SM2A or the like between the position where the mark M appears and the position where the next registration mark M appears, and a preset reference pitch. P is compared to calculate the deviation.

After the deviation between adjacent registration marks is calculated in step (ST) 1, the process proceeds to step (ST) 2.
In step (ST) 2, the deviation actually detected by the deviation determination function 42 of the immediate error correction unit 41 is compared with a preset large allowable amount, that is, the length of 10% of the bag length. is executed.
Then, when the detected deviation exceeds the large allowable amount, the process proceeds to step (ST) 2-1, the machine is stopped by a paper feeding abnormality alarm, and the correction control is stopped.

If the deviation detected in step (ST) 2 does not exceed the large allowable amount, that is, if the deviation is within 10% of the bag length, proceed to step (ST) 2-2 to perform the immediate error correction function. 43 corrects the deviation immediately, and proceeds to step (ST) 3 .
This correction is performed by controlling the film feeding servo motor SM2A and the like by the film feeding control section 49 of the control device 4 to adjust the film feeding speed.
Further, in step (ST) 3, after the total deviation of a plurality of bags sequentially passing the position of the registration mark sensor 20 is obtained by the deviation average value calculation function of the cumulative error correction unit 45 , the plurality of bags Calculate the average value of the bag displacement.

After the average deviation is calculated in step (ST) 3, the process proceeds to step (ST) 4.
In step (ST) 4, when the deviation determination function 47 of the cumulative error correction unit 45 determines the average value of deviation, the process proceeds to step (ST) 4-1, where the cumulative error correction of the cumulative error correction unit 45 is performed. A function 48 corrects the deviation.
This correction is performed by controlling the film feeding servo motor SM2A and the like by the film feeding control section 49 of the control device 4 to adjust the film feeding speed.

If the average value of the deviations detected in step (ST) 4 is not determined, that is, if there is no average value of deviations, the process proceeds to step (ST) 5 .
In this step (ST) 5, after the average value of deviation is stored in the storage device 5, the process proceeds to step (ST) 6. FIG.

In step (ST) 6, after advancing one bag, the process returns to step (ST) 1.
If there is a deviation between the detected registration marks, this cycle is repeated until the scheduled bag-making work by the packaging machine M is completed.

According to the form-fill-seal machine M configured as described above, the following effects can be obtained.
(1) The control device 4 is provided with a cumulative error correction section 45 having a feeding speed adjustment function. The packaging material feeding speed can be adjusted by a value obtained by multiplying the number of the packaging materials by the number of , thereby correcting the packaging material feeding amount.
As a result, it is possible to automatically eliminate cutting deviations due to accumulated errors of positional deviations, eliminating the need for the operator to frequently correct cutting positions, and improving workability.

(2) The control device 4 is provided with an immediate error correction section 41, and this immediate error correction section 41 detects that the positional deviation of the conveyed strip film Fw does not exceed 10% of the preset bag length. Since the correction is made immediately in the event of a slip, it is possible to cope with a sudden positional deviation such as a slip.

(3) The control device 4 is provided with a cumulative error correction section 45, and the cumulative error correction section 45 determines that, for example, if the average value of the displacement of 20 bags is within 5% of the preset bag length, By sending the sheets without correction, for example, even if the belt-like film Fw having a deviation amount that cannot be corrected by the immediate error correction unit 41 is mixed in the process of calculating the average value of the deviation amount of 20 bags. , is calculated as an inclusive average and corrected. As a result, even in the above case, a large deviation is alleviated.

Next, a second embodiment of the form-fill-seal machine according to the present invention will be described with reference to FIGS. 8 to 10. FIG.
In the form-fill-seal machine M2 of the second embodiment, as shown in FIGS. The configuration is based on the pulse signal that is applied.
The length measuring device 120 is arranged, for example, between the pair of rollers 21a and 21b and the guide roller 26 in the form-fill-seal machine M2 of the second embodiment shown in FIG.

As described above, the length measuring device 120 includes a rotary encoder 121 and a length measuring roller 122 which is coaxially attached via the rotary shaft of the rotary encoder 121 and contacts one side of the belt-shaped packaging material Fw. configured with. At least the outer peripheral surface of the length measuring roller 122 is made of a member having a large coefficient of friction, such as rubber. Any of natural rubber, silicon rubber, urethane rubber, etc. may be used as the rubber. Moreover, if the member has a large coefficient of friction, for example, felt may be used.

Since the length measuring roller 122 of the rotary encoder 121 is in contact with one side of the belt-shaped packaging material Fw, when the paper feeding mechanism 25 feeds the belt-shaped packaging material Fw downstream, the length measuring roller 122 is moved to the belt-like shape. It rotates following the movement of the packaging material Fw. As the length measuring roller 122 rotates, the rotary encoder 121 outputs a pulse signal as the rotation angle displacement of the rotation axis, in other words, the length measuring roller 122. By counting by 40, it is possible to measure the amount of movement of the strip-shaped packaging material Fw.

Here, a guide roller (not shown) is provided at a position facing the length measuring roller 122 with the belt-shaped packaging material Fw therebetween, and the belt-shaped packaging material Fw is sandwiched between the guide roller and the length measuring roller 122. It is good also as a structure which can send the said strip|belt-shaped packaging material Fw by.
Further, the length measuring roller 122 may be arranged on the other surface side of the belt-shaped packaging material Fw so as to be in contact with the other surface.
Further, the position of the rotary encoder 121 does not have to be between the pair of rollers 21a and 21b and the guide roller 26 as described above. For example, it is preferably provided at a position close to the registration mark sensor 20 between the pair of rollers 21a and 21b and the original fabric roller Fr.
As described above, the form-fill-seal machine M2 of the second embodiment shown in FIG. have the same configuration. Therefore, description of those configurations is omitted.

FIG. 9A shows the sensor output signal for calculating the length of the reference pitch P between the registration marks RM and the pulse signal of the rotary encoder 121 in the bag making, filling and packaging machine M2 of the second embodiment. FIG. 9B shows the sensor output signal and the pulse signal of the rotary encoder 121 for calculating the length of the detection pitch P1 between the registration marks RM.
As can be read from FIGS. 9A and 9B, the number of pulses of the pulse signal of the rotary encoder 121 at the reference pitch P is greater than the number of pulses of the pulse signal of the rotary encoder 121 at the detection pitch P1. The amount of deviation between the reference pitch P and the detection pitch P1 can be known from the number of pulses in .

The operation of the form-fill-seal machine M2 of the second embodiment differs only in the deviation calculation in step (ST) 1 in the flowchart of FIG. flow is the same. Therefore, description of that portion is omitted.

First, when the correction of the misalignment of the belt-shaped packaging material Fw unwound from the original fabric roll Fr is started, first, in step (ST) 1, the sensor output signal output by the rotary encoder 121 and the A detection pitch P1 calculated by counting the number of pulses output from the rotary encoder 121 between the position where the registration mark M appears and the position where the next registration mark M appears, and a preset reference pitch. P is compared to calculate the deviation.
When the deviation between adjacent registration marks is calculated in step (ST) 1, the process proceeds to step (ST) 2 and then to step (ST) 6. FIG.

According to the second embodiment configured as described above, substantially the same effects as those in (1) to (3) can be obtained, and the following effects can be obtained.
(4) At least the outer peripheral portion of the length measuring roller 122 constituting the length measuring device 120 is made of rubber having a large coefficient of friction. , so that the feeding speed of the band-shaped packaging material Fw can be directly measured without slipping. It can be output to the calculation unit 40 .

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be added to the configuration and details of the present invention. In addition, the present invention also includes appropriate combinations of part or all of the configurations of the above-described embodiments.

For example, in each of the embodiments described above, the positional deviation is specified as a distance, but it may be specified as a registration mark passing time.

Further, in each of the above-described embodiments, an example of calculating the positional deviation by counting the number of feedback pulses was shown, but the present invention is not limited to this. For example, the set passage time for one bag of packaging material (i.e., the registration mark passage time interval) is calculated based on a preset packaging material feed speed, and the actual measurement is performed based on the timing of two successive registration mark passages. Calculate the passage time for one bag of material (that is, the measured register mark passage time interval), use the difference between these to identify the positional deviation by time, and set the preset bag length x (actually measured one bag of packaging material The distance of the positional deviation may be calculated by (passing time of minutes/passing time set for one bag of packaging material).

Furthermore, in each of the above-described embodiments, 10% of the bag length was a preset value as the large allowable amount determined by the deviation determination function 42 in the immediate error correction unit 41 of the control device 4. is not limited. Based on empirical values, it may be set higher or lower, for example 8-12% of the bag length.

In each of the above-described embodiments, 5% of the bag length was a preset value as the small allowable amount determined by the deviation determination function 47 in the cumulative error correction unit 45 of the control device 4. is not limited. Based on empirical values, it may be set higher or lower, for example, 3-10% of the bag length.

Further, in each of the embodiments described above, the amount of positional deviation is detected based on the difference between the reference pitch P and the detected pitch, but the present invention is not limited to this. For example, the error calculation unit 40 of the control device 4 may be configured to calculate the difference between the registration mark interval value calculated at a certain point in time and the registration mark interval value calculated subsequently as the amount of positional deviation.
In this case, the registration mark interval value calculated at a certain time is temporarily stored in the storage unit 5 by, for example, the registration mark interval value storage processing function of the error calculation unit 40. When calculating the difference from the calculated registration mark interval value, it is preferable that the registration mark interval value stored in the storage unit 5 is read from there by the registration mark interval value storage processing function.
Furthermore, in each embodiment, the reference pitch P is set in advance, but this may be specifically configured as follows. For example, a value of a specific reference pitch P is stored in advance in the storage unit 5, and the controller 4 reads out the reference pitch P from the storage unit 5 when the bag making, filling and packaging machine is started. It's good to be Alternatively, the configuration may be such that the user inputs and sets the reference pitch P via the operation/display device 6 when the form-fill-seal machine is in operation.
Further, in each of the embodiments described above, the positional deviation is detected between the reference pitch P and the detection pitch, but the present invention is not limited to this. For example, the control device 4 includes an error calculation unit 40 for calculating the amount of positional deviation. The registration mark interval value may be calculated based on the material feeding amount.

INDUSTRIAL APPLICABILITY The present invention can be used when correcting the cumulative misalignment of registration marks in a plurality of bags from the registration mark sensor to the end sealing device.

M bag making, filling and packaging machine (first embodiment)
M2 bag making, filling and packaging machine (second embodiment)
2 film feeding device 3 end sealing device 4 control device 5 storage device 20 registration mark sensor (registration mark detection device)
21 Paper feed roller 40 Error calculation unit 41 Immediate error correction unit 42 Deviation determination function 43 Immediate error correction function 45 Accumulated error correction unit 46 Deviation average value calculation function 47 Deviation determination function 48 Cumulative error correction function 49 Film feeding control unit 50 Cutter device 120 Length measuring device 121 Rotary encoder constituting the length measuring device 122 Length measuring roller constituting the length measuring device
SM1 Supply conveyor drive servo motor SM2A, SM2B, SM2C Film feed servo motor SM3A End sealing device servo motor (vertical movement drive motor)
SM3B Servo motor for end seal device (drive motor for forward and backward movement)
Fr Raw fabric roll Fw Belt-shaped packaging material Ft Cylindrical packaging material P Product (item to be packaged)
Bp pillow package

Claims (9)

Packing in which the packaging material with registration marks for alignment corresponding to the unit of the bag is pulled out from the raw fabric roll and sent downstream by the amount of packaging material sent per bag at a packaging material feed speed set in advance. a material feeding device;
an end-sealing device for end-sealing and cutting a cylindrical packaging material formed from packaging materials sent and containing items to be packaged;
a registration mark detection device arranged upstream of the end seal device and detecting passage of the registration mark at a predetermined detection position;
A form-fill-seal and packaging machine comprising a control device that controls the operation of each device,
The control device includes a cumulative error correction unit that adjusts the feeding amount of the packaging material,
The interval between the registration marks is defined as a pitch, the preset pitch is defined as a reference pitch, the pitch detected by the registration mark detection device is defined as a detection pitch, and the difference between the detection pitch and the reference pitch is defined as a positional deviation amount. when
The packaging material feeding device feeds the packaging material downstream by the detection pitch,
The cumulative error correction unit obtains an average value of the most recently calculated positional deviation amounts, and if the average value exceeds an allowable amount, an error exists between the registration mark detection device and the end seal device. Multiply the number of bags to be packed by the average value to obtain the cumulative error, adjust the packaging material feeding speed when feeding the next pitch so that the cumulative error disappears , and after feeding the pitch A form-fill-seal and packaging machine characterized in that it has a speed adjusting function for returning the packaging material feeding speed of the above . In the form-fill-seal machine according to claim 1,
A form-fill-seal machine, wherein the most recently calculated plurality corresponds to the number of bags existing between the registration mark detection device and the end sealing device. In the form-fill-seal machine according to claim 1 or 2,
The speed adjustment function increases the packaging material feeding speed if the detected pitch is smaller than the reference pitch when adjusting the packaging material feeding speed, and increases the packaging material feeding speed if the detected pitch is larger than the reference pitch. A form-fill-seal machine characterized by reducing the feeding speed . In the form-fill-seal machine according to any one of claims 1 to 3,
The control device includes an error calculation unit for calculating the amount of positional deviation,
The error calculator,
A registration mark interval value calculating function is provided for calculating the detection pitch based on the feeding amount of the packaging material sent by the packaging material feeding device each time the registration mark passes the detection position. Form-fill-seal machine. In the form-fill-seal machine according to any one of claims 1 to 4 ,
A form-fill-seal and packaging machine, wherein the control device includes an immediate error correction unit having an immediate error correction function for immediately correcting the feeding amount of the packaging material by an amount corresponding to the amount of positional deviation. . In the form-fill-seal machine according to claim 4 ,
The packaging material feeding device includes a paper feeding roller that feeds the packaging material downstream and a film feeding servo motor that drives the paper feeding roller,
A form-fill-seal machine according to claim 1, wherein said film-feeding servo motor outputs a pulse signal corresponding to the rotation angle of a rotating shaft of said servo motor to said error calculation unit. In the form-fill-seal machine according to claim 6 ,
a length measuring device comprising a length measuring roller rotatably contacting one surface of the packaging material and a rotary encoder coaxially equipped with the length measuring roller;
The form-fill-seal machine, wherein the rotary encoder outputs a pulse signal corresponding to a rotation angle of a rotary shaft of the rotary encoder to the error calculation unit. In the form-fill-seal machine according to claim 7 ,
A form-fill-seal machine, wherein at least an outer peripheral surface of the length measuring roller is made of rubber. In the form-fill-seal machine according to any one of claims 6 to 8 ,
The registration mark detection device outputs a sensor output signal indicating registration mark appearance timing to the error calculation unit,
The error calculator counts the number of pulses of the pulse signal between the position where the registration mark appears and the position where the next registration mark appears, based on the pulse signal and the sensor output signal. A bag- making, filling and packaging machine characterized in that the detected pitch is obtained and the detected pitch is determined as the feeding amount of the packaging material to be fed by the packaging material feeding device each time the registration mark passes the detection position.

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