JPH057255B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a pattern matching mechanism of a packaging material feeding device, and more specifically, a pattern matching mechanism for a packaging material feeding device, specifically, a pattern matching mechanism for a packaging material web at regular intervals (for one package).
Patterns (designs, trademarks, indications, etc.) printed after
This relates to a device that accurately stops the transport of the web when the boundary portion of the web reaches the position of the cutter or sealing device.

(Prior Art) Conventionally, as a pattern matching mechanism of this type of packaging material feeding device, as disclosed in Japanese Patent Publication No. 59-3325, for example, a web with registration marks supplied from a packaging material roll is fed by a feeding means. A registration mark sensor for detecting registration marks on the web is disposed on the web transfer path, and immediately after the detection of the registration mark sensor, the clutch of the drive unit of the feeding means is disengaged to cause the web to be fed out and transferred intermittently. This is to stop the transfer.

(Problem to be Solved by the Invention) However, in the pattern matching mechanism of such a conventional packaging material feeding device, there is a problem when using webs with different registration mark pitches or even when using the same web during operation. In addition, when a misalignment of the pattern occurs, it is necessary to move the position of the registration mark sensor along the web transport path by operating the handle and adjust the web stop ticing, so it takes time to set or adjust the pattern matching. In addition, there is a problem in that reproducibility is poor and operability is poor, and since the registration mark sensor must be made into a movable structure, the mounting structure of the registration mark sensor becomes complicated.

In addition, since the web is fed out intermittently, starting and stopping repeatedly, when the web stops feeding, its inertia causes the web to slack downstream of the registration mark sensor, and this slack causes the web to slide over the registration mark sensor. The phenomenon of moving backward or repeatedly moving forward and backward occurs, and as a result,
If the registration mark sensor detects two or more identical registration marks, there is a risk that the drive unit of the feeding means may malfunction based on this, and items similar to the registration mark may exist on the web due to printing errors or dust adhesion. In this case, there is a problem that the registration mark may detect this and cause a malfunction.

In view of such conventional circumstances, the present invention makes it possible to change the stop timing of the web with the registration mark sensor fixed at a fixed position, as well as double detection and printing of registration marks due to slack in the web that occurs when feeding is stopped. The purpose is to prevent false detections such as adhesion of dust.

(Means for Solving the Problems) The technical means taken by the present invention to solve the above problems is to synchronize a length measuring means for constantly measuring the running length of the web on the web transport path with the running speed of the web. The length measuring means and registration mark sensor are connected to the drive section of the feeding means via a control section, and the control section receives the measured value by the length measuring means. An offset counter for counting, an input means for inputting an offset value corresponding to the length of web travel after detection of the registration mark and the pitch of the registration mark, and an offset sequence for starting the operation of the offset counter when the registration mark is detected by the registration mark sensor. and a feed-out stop means that compares the measured value of the offset counter with the offset value and stops the driving part of the feed-out means when the two match, and a measured value of the offset counter when the registration mark sensor detects the next registration mark. The present invention is characterized by comprising a registration mark determining means that compares the pitch of the registration mark and the registration mark, and starts the next offset sequence only when the two substantially match.

It is preferable to provide another offset counter that starts counting when the next registration mark is detected while the offset counter is counting.

In addition, the packaging material feeding device intermittently feeds out the web supplied from the packaging material roll while forming it into a cylindrical shape via the tube molded body, fills the formed tube with the material to be packaged, and fills the web into a tube. A feeding device for a bag making, filling and packaging apparatus that later seals a tube in the width direction, in which a feeding means is disposed on the downstream side of the tube formed body, and a length measuring means and a registration mark sensor are disposed on the upstream side of the tube formed body. It is preferable to set

(Function) According to the above-mentioned technical means, the present invention inputs the offset value and the pitch of the registration mark to the control unit by operating the input means, and then starts feeding out the web, so that the registration mark sensor adjusts the registration mark. is detected, the offset sequence starts, the offset counter counts the measured value of the length measuring means as the web runs, and when the counted number matches the offset value above, the drive section of the feeding means is stopped. When the registration mark sensor detects the next registration mark and the registration mark sensor detects the next registration mark, if the measured value from the previous registration mark detection position does not substantially match the pitch of the registration mark, it is determined that it is other than the registration mark. Instead of starting the next offset sequence, the next offset sequence starts after the measured value substantially matches the registration mark pitch.

Then, while the offset counter is counting due to the detection of the previous registration mark, when the registration mark sensor detects the next registration mark that approximately matches the pitch of the registration mark, another offset counter starts operating and starts counting. It is something.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 1, this embodiment shows a case where a feeding roller 3' is used as the feeding means. In FIG. b ₁ ', b ₂ '... are guide rollers, S is a registration mark sensor, 10 is a rotary encoder as a length measuring means, 5' is a cutter, 6' is a clutch and brake, M is a motor , C is a control section having a built-in computer, and the clutch and brake 6' and the motor M constitute a driving section for the feeding roller 3'.

By the starting rotation of the feed roller 3',
A web a is fed out from a packaging material roll A, and the web travels on a web transfer path from the packaging material roll A that passes through a cutter 5'.
When the registration mark sensor S detects the registration mark, the controller C enters an offset sequence.

In the offset sequence, the rollery encoder 10 measures the running length of the web, and when the measured value of the running length reaches an offset value (set value) inputted in advance to the control section C, the clutch and the The brake 6' is applied to stop the feed roller 3', thereby stopping the boundary portion of the pattern printed on the web at the position of the cutter 5'.

After the cutter 5' operates to cut the web a at a predetermined position, the control unit C starts the feed roller 3' again and repeats the above-described operation, thereby intermittently feeding out the web a.

Note that the detailed configuration of the control section C is the same as that of other embodiments described later.

Next, what is shown in FIG. 2 is another embodiment of the present invention, and shows the case of a packaging material feeding device in a bag making, filling and packaging device. A cylindrical body for bag making that can hang down from the body, 3 a feeding belt as a feeding means, 4 a vertical sealing part, 5 a horizontal sealing part, A a packaging material roll in which a web a such as a film is wound. be.

The web a pulled out from the packaging material roll A is appropriately guided to the tube molded body 1 via guide rollers b ₁ , b ₂ , b ₃ . After that, it descends along the outer periphery of the bag-making cylinder 2 to form a tube a'.

The path along which the web a moves from the packaging material roll A to the bottom of the bag-making cylinder 2 is called a web transfer path.

The web a is subjected to downward feeding force by the feeding belt 3 that contacts the outer periphery of the tube a', thereby being pulled out against the tension lever 7' and transferred onto the web transfer path.

Two feeding belts 3 are arranged on the outer periphery of both opposing sides of the bag-making cylindrical body 2, and the driving shaft of the feeding belt 3 is connected to a clutch and a brake 6.
is connected to the motor M via the clutch and the brake 6 to perform an intermittent rotation operation that starts and stops at appropriate times, thereby rotating the web a and the tube.
Perform a′ intermittently.

When the tube a' descends along the bag-making cylinder 2, its cylindrical mating edges are sealed by a vertical sealing device 4, and when it moves below the bag-making cylinder 2, it is used for bag-making. A predetermined amount of the material m to be packaged is lowered and filled through the cylindrical body 2, and then a predetermined portion above the filled material m is sealed by the lateral sealing part 5, The middle part of the sealed part is cut in the transverse direction (width direction) by a knife included in the sealed part 5, and the bag-like material a is separated from the lower end of the tube a'.

In addition, 7 in the figure is an auxiliary feed-out roller for reducing the force of pulling out the web a from the packaging material roll A, and 7' is the drive unit of the feed-out roller 7 turned on.
A tension lever 8 serves to turn off the web and to buffer the web, and 8 is a tension lever that applies a brake to the web a pulled out from the packaging material roll A in a timely manner.

Then, a rotary encoder 10 and a registration mark sensor S as length measuring means are installed on the web movement path, more specifically, on a movement path upstream of the tube molded body 1, and these rotary encoder 10 and registration mark sensor S are controlled by a control unit. It is connected to the drive unit of the feeding belt 3, that is, the clutch and brake 6, through C to control the starting and stopping of the feeding belt 3.

The rotary encoder 10 is installed to face the web a traveling on the transfer path, and is rotatable in forward and reverse directions in the traveling direction of the web a and its opposite direction in synchronization with the traveling speed of the web a. The actual running length of the web a is measured by transmitting the number of pulses corresponding to the running length of the web a to the central processing circuit CPU of the control unit C.

The system block of the control unit C is as shown in Fig. 3, and the ROM 11 stores fixed data such as determination count values and time lag values for determining whether or not the registration mark is appropriate, and control data such as programs. The RAM 12 is a memory into which output signals from the rotary encoder 10 and registration mark sensor S are input, and has a counter function to count pulse signals transmitted from the rotary encoder 10.

In addition, the backup RAM 13 is a memory that stores setting values such as an offset value that determines the web running length after the registration mark is detected and the pitch of the registration mark. is input.

The counter function of the RAM 12 is the ROM
A reversible registration mark judgment counter 12a that subtracts the count value from the judgment count value of 11 when the rotary encoder 10 rotates in the forward direction and adds a count number when the rotary encoder 10 rotates in the reverse direction.
The first offset counter 12b and the second offset counter 12b' add a count number at the time of normal rotation of 0, and the count value of the first offset counter 12b or the second offset counter 12b' matches the offset value. In the later time lag sequence, the time lag counter 1 adds a count number when the rotary encoder 10 rotates forward.
2c.

Note that the CRT 15 in FIG. 3 is a display section.

Therefore, the control operation of the control section C is shown in FIGS. 4 and 5.
As shown in the figure, for example, the ROM 11 stores an area from a value obtained by subtracting a certain length from the registration mark pitch to a value obtained by adding a certain length to the registration mark pitch as a judgment count value, and as a time lag value. Assuming that 7 mm is stored in memory, first, set values such as offset values and registration mark pitches are input digitally into the backup RAM 13 of the control unit C using the keypad 14.
Start the bag making, filling and packaging equipment.

When the bag making and filling device is started, the clutch and brake 6 are turned off and engaged, and the feeding belt 3 is activated to start feeding out the web a, and accordingly, the web a travels and the rotary encoder 10 rotates. to measure the length.

First, when the web a runs, the registration mark judgment counter 12a of the RAM 12 sequentially decrements the judgment count value to 0 due to the forward rotation of the rotary encoder 10.

When a registration mark on web a is detected by sensor S while web a is traveling, it is determined whether or not the judgment counter 12a has reached 0 at that point, and if it has reached 0, a registration mark detection signal is sent. At the same time as entering the offset sequence, a determination count value is read into the registration mark determination counter 12a.

The offset sequence is exemplified by programming an offset sequence 1 in which the first offset counter 12b operates and an offset sequence 2 in which the second offset counter 12b' operates, and the offset value in the RAM 13 is set to the register. If it is shorter than the mark pitch, only offset sequence 1 is started, and as shown in the time chart of FIG.
The rotation amount (pulse number) of 0 is counted, and when the counted number reaches the offset value of the RAM 13, the counted number of the first offset counter 12b is reset to 0, and then a time lag sequence is entered.

Also, if the offset value of RAM13 is longer than the registration mark pitch, the registration mark sensor S
Each time the register mark on web a is detected, offset sequence 1 and offset sequence 2 are started alternately, and the first offset counter 12
b and the second offset counter 12b' alternately count the rotation amount (number of pulses) of the encoder 10,
When these counts successively reach the offset value of the RAM 13, the counts are reset to 0 and then a time lag sequence begins.

In the time lag sequence, the clutch and the brake 6 are disengaged, and the web is further run for a certain period of time.The time lag counter 12c in the RAM 12 starts counting, and when the count reaches the time lag count value in the ROM 11, , the clutch and the brake 6 are turned on, thereby stopping the feeding belt 3.

Also, during the above operation, the material to be packaged m is filled through the bag-making cylinder 2, and with the feeding belt 3 stopped, a sealing operation is performed by the lateral seal section 5, and the reel section 5 is sealed. Upon completion, the feeding belt 3 is activated again and the above-described operation is repeated.

Since the feeding operation of the feeding belt 3 is an intermittent feeding that repeatedly starts and stops, when the feeding belt 3 stops (when the brake is applied), the inertia of the web moves the web a to the position of the guide roller b ₁₀ or the rotary encoder 10. A slack is generated in the web a on the downstream side of the web a, and this slack causes the web a to
A phenomenon occurs in which the register mark sensor S moves backward or moves forward and backward repeatedly, especially when
If the offset value of the RAM 13 is very small or close to the pitch of the registration marks, the registration mark sensor S may detect two or more of the same registration marks.

At the time of this phenomenon, rotary encoder 1
0 is reversed, or the forward and reverse rotations are repeated in small steps, so the judgment counter 12a of the RAM 12 subtracts the count when the rotary encoder 10 rotates forward, and increases the count when the rotary encoder 10 rotates in the reverse direction, and the registration mark sensor S registers the registration mark. When the determination counter is detected, it can be determined whether the determination counter has reached 0 or not.

If the judgment counter 12a has not reached 0, it is judged that the detected registration mark is the same as the previously detected registration mark, and the shift to the offset sequence due to the registration mark detection is prohibited, and the feeding belt 3 is Prevent malfunction.

The prevention of double detection of the same mark by the judgment counter 12a prevents malfunctions caused by the existence of something similar to the registration mark on the web a due to printing errors or dust adhesion at positions other than the registration mark pitch. It can be prevented.

Although the above embodiment uses the feeding belt 3 as the feeding means, other means such as a feeding roller may be used, and means other than the rotary encoder 10 may also be used as the length measuring means.

Although the operation in the embodiment includes two offset sequences, it may also be performed with one or three or more.
Of course, it is possible, and although we have explained the case where a time lag sequence is used, it is possible to stop the feeding belt 3 immediately when the length measuring means measures the set length of web a without using a time lag sequence. Good too.

Furthermore, it is also optional to use a tubeless bag-making guide means in place of the bag-making cylinder 2.

(Effects of the Invention) Since the present invention has the above configuration, it has the following advantages.

By inputting the offset value and the pitch of the registration mark into the control unit by operating the input means and then starting to feed out the web, the registration mark sensor detects the registration mark and the offset sequence starts, and the web runs. The offset counter counts the measured value of the length measuring means, and when the counted number matches the offset value, the driving part of the feeding means is stopped, one intermittent feeding is completed, and the registration mark is set. When the sensor detects the next register mark,
If the measured value from the previous registration mark detection position does not approximately match the pitch of the registration mark, it is determined that it is other than the registration mark and the next offset sequence is not started, and the measured value does not approximately match the pitch of the registration mark. Since the next offset sequence starts operating from this point, it is possible to change the web stop timing while the registration mark sensor is fixed in place, and it also prevents double detection of registration marks due to slack in the web that occurs when feeding is stopped. It can prevent false detections such as printing errors and dust adhesion.

Therefore, compared to the conventional method in which the web stop timing is adjusted by moving the registration mark sensor,
Setting or adjusting the pattern matching is extremely easy and has excellent reproducibility, and since the actual running length of the web is measured by a length measuring means in the offset sequence, it is possible to keep the set web feed amount constant at all times. The tightening and feeding precision can be improved, the mounting structure of the registration mark sensor is simplified, the sensor and its surroundings can be simplified, and the registration mark can be accurately detected to prevent the feeding means from malfunctioning.

If you provide another offset counter that starts counting when the next registration mark is detected while the offset counter is counting, then when the offset counter is counting due to the previous registration mark detection,
When the registration mark sensor detects the next registration mark that substantially matches the pitch of the registration mark, another offset counter starts operating and counts, so it is possible to set an offset value that is longer than the pitch of the registration mark.

Therefore, if the offset value corresponding to the web running length after the registration mark is detected is smaller than the mechanical delay or electrical delay from when the registration mark is detected until the web actually stops running. However, by adding and setting the registration mark pitch or multiple times the registration mark pitch to this offset value, you can stop the web running at an accurate position. can be stopped reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a pattern matching mechanism of a packaging material dispensing device showing one embodiment of the present invention, FIG. 2 is a block diagram of a pattern matching mechanism of a packaging material dispensing device showing another embodiment of the present invention, and FIG. FIG. 3 is a system block diagram of the control section, and FIG. 4 is a flowchart of the control section.
i is a flowchart when the rotary encoder rotates in the normal direction, i is a flowchart when the registration mark is detected, is a flowchart when the rotary encoder is reversed, and FIG. 5 is a time chart. A...Packaging material roll, a...Web, a'...tube, C...control unit, S...register mark sensor, M...drive unit (motor), m...packaged material,
1... Tube molded body, 3', 3... Feeding means (feeding roller, feeding belt), 10... Length measuring means (roller encoder), 12, 12b'...
Offset counter, 14...Input means (keypad).

Claims (1)

[Scope of Claims] 1. A web with registration marks is intermittently fed out and transferred from a packaging material roll by the operation of a feeding means, and a registration mark sensor for detecting registration marks on the web is disposed on the web transfer path, In the packaging material feeding device that stops the drive unit of the feeding device upon detection of the registration mark sensor, a length measuring device that constantly measures the running length of the web is installed on the web transfer path to move the web in synchronization with the running speed of the web. The length measuring means and the registration mark sensor are connected to the drive section of the feeding means via a control section, and the control section counts the measured value by the length measuring means. an offset counter, an input means for inputting an offset value corresponding to the length of web running after the registration mark is detected and the pitch of the registration mark; an offset sequence for starting the operation of the offset counter when the registration mark is detected by the registration mark sensor; A feed-out stop means that compares the measured value of the offset counter with the offset value and stops the driving part of the feed-out means when the two match, and a register mark sensor that compares the measured value of the offset counter with the register when the next registration mark is detected. A pattern matching mechanism characterized by comprising registration mark determining means for comparing the pitches of the marks and starting the next offset sequence only when the two substantially match. 2. A pattern matching mechanism for a packaging material feeding device according to claim 1, further comprising a separate offset counter that starts counting when the next registration mark is detected while the offset counter is counting. 3 The packaging material feeding device intermittently feeds out the web supplied from the packaging material roll while forming it into a cylindrical shape through the tube formed body, fills the formed tube with the wrapped material, and after filling, A feeding device for a bag making, filling and packaging device that seals a tube in the width direction, in which a feeding means is disposed downstream of the tube formed body, and a length measuring means and a registration mark sensor are disposed upstream of the tube formed body. A pattern matching mechanism according to claim 1 or 2.