JP2849749B2 - Packaging paper registration mark detection device with automatic sensitivity adjustment function for packaging machines and bag making machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides an automatic sensitivity adjustment operation for a very short time so as to advance the film by a unit wrap length before the main operation, thereby reducing the wrapping paper. Despite the individual relative differences in the intensity of reflected light or transmitted light of the mark sensor between the ground portion of the edge and the registration mark, automatic sensitivity adjustment of the registration mark can be performed. The present invention relates to a packaging machine capable of outputting a registration mark detection signal by clearly discriminating a registration mark at an edge of a wrapping paper from other portions without malfunction, and a packaging paper registration mark detection device with an automatic sensitivity adjustment function of a bag making machine.

[Prior Art and its Problems] First, the technical significance of detecting a registration mark at the edge of a wrapped paper during operation in a packaging machine or a bag making machine will be described.

One is to use it as a displacement detection signal when the registration mark at the edge of the wrapped paper is displaced from the end seal cut position.

Specifically, in the horizontal pillow packaging machine, the registration mark at the edge of the wrapped paper is 2 to 4 m from the end seal cut position.
When the position is displaced by m, it is necessary to correct the deviation by adjusting the rotation of the paper drawing roll. Therefore, the passage of the registration mark is detected by the photoelectric tube during operation, and the main controller obtains the detection signal and the passage of a protrusion attached to the end seal cutting means and the cutter shaft by a proximity sensor or the like. Input the origin signal corresponding to the seal cut timing, constantly compare and calculate the phase shift between the two signals,
When the phase shift exceeds the upper limit or lower limit of a certain range, a control signal to which a necessary correction necessary for eliminating the phase shift is added is output to the motor driver to adjust the rotation of the paper drawing roll to be slower or faster. doing.

The other one is that the wrapped paper is roll paper, and in a vertical pillow wrapping machine or an bun wrapping machine that intermittently feeds the wrapped paper, the registration mark at the edge of the wrapped paper is located at the end seal cut position. This is because the wrapped paper is used as a timing signal to stop the wrapped paper without shifting when the wrapped paper comes to just match.

Next, the wrapped paper registration mark detection device will be described.

Heretofore, there has been no packaged paper registration mark detection device with an automatic sensitivity adjustment function for a packaging machine and a bag making machine as in the present invention. The conventional broadcast paper registration mark detection device employs a digital photoelectric tube with a dial as a mark sensor whose sensor signal is 1 or 0 and whose sensitivity can be adjusted by manually turning the dial.
The I / O signal is taken into the main controller for calculation, and in this case, the mark sensor is adjusted in sensitivity before driving so that it can reliably detect when the registration mark has passed. Was a prerequisite.

The reason why it is necessary to adjust the sensitivity of the mark sensor before driving is as follows.

When a phototube is provided as a mark sensor at the edge of the wrapped paper to detect the passage of the registration mark based on the intensity of the reflected light, if the mark sensor has a transparent ground portion and a black registration mark, Regarding the wrapping paper, even if the registration mark can be effectively detected, if the ground portion is white, gold or silver and the registration mark is black, the intensity of the reflected light is reversed, so that the registration mark cannot be detected. Even if the intensity of the reflected light of the ground portion and the registration mark is not reversed, the registration mark cannot be detected even when the intensity of the reflected light is different.

In short, since there is an individual relative difference between the intensity of the reflected light or the transmitted light of the mark sensor between the ground portion of the edge of the wrapped paper and the registration mark, it is necessary to adjust the sensitivity of the mark sensor.

For this reason, conventionally, as described above, the output signal is I / O
The digital phototube with dial, whose sensitivity can be adjusted by turning the dial by hand, is adopted as the mark sensor.Before the actual operation, be sure to attach the mark sensor to the ground part at the edge of the wrapped paper. Turn the dial to read the first dial memory when the sensor signal changes from 0 to 1, and adjust the registration mark to the mark sensor and turn the dial to turn the sensor signal to 0.
The second dial memory is read when changing from 1 to 1, and the dial is adjusted to adjust the dial to a substantially intermediate value between the two dial memories. The sensitivity is adjusted so that "1" is effectively obtained as a sensor signal when the registration mark comes.

[Problems to be Solved by the Invention] However, since it is troublesome to perform the automatic sensitivity adjustment of the mark sensor by turning the dial as described above, an automatic sensitivity adjustment system for the mark sensor has been provided.

The present invention has been devised in view of the above points, and employs an analog mark sensor in place of the conventional digital mark sensor, and does not adjust the output of the sensor itself prior to actual driving. When the automatic sensitivity adjustment switch is pressed, the film is fed by a very short length, and the change in the sensor signal during that time is read to determine the land portion at the edge of the wrapped paper and the registration mark, and then the main operation standby When this operation switch is pressed, the wrapping paper registration mark detection device with automatic sensitivity adjustment function of the packaging machine and bag making machine that can reliably determine whether the sensor signal is the detection signal of the ground part or the registration mark by pressing this operation switch It is intended to provide.

[Means for Solving the Problems] The wrapped paper registration mark detection device with an automatic sensitivity adjustment function in the wrapping machine and the bag making machine of the present invention is provided so as to be able to correspond to the edge of the wrapped paper W,
A mark sensor 1 capable of outputting a difference in intensity of reflected light or transmitted light between the ground portion N of the wrapped paper W and the registration mark M in an analog amount, and converting the analog amount output from the mark sensor 1 into a digital amount X And a digital signal X output from the A / D converter 2 during the sensitivity adjustment operation is input each time the wrapped paper W travels a small predetermined pitch, and a required control signal is calculated. Control unit 3 that outputs
And inputting a required control signal of the control unit 3,
Digital quantity X output from A / D converter 2 during actual operation
And a comparator 4 for inputting and outputting a mark detection signal each time the wrapped paper W travels a small predetermined pitch. The control unit 3 firstly outputs the mark detection signal from the registration mark M. The average value of the digital amount X of the ground portion N at the edge of the wrapping paper W is obtained, and the digital amount X is successively input each time the wrapped paper W travels a minute predetermined pitch to obtain the digital amount of the registration mark M. The average value of X is calculated, the intermediate value (+) / 2 between the average value and the average value is calculated, and the intermediate value (+) / 2 is output as the threshold value C. When the average value is smaller than the average value Outputs the positive output terminal selection signal P, outputs the negative output terminal selection signal Q when the average value is greater than the average value, and does not input the digital amount X after outputting the C, P, and Q signals. In addition, the comparator 4 is provided with the threshold signal C and The threshold value signal C and the plus-side output terminal selection signal are electrically connected to the control unit 3 so that the plus-side output terminal selection signal P and the minus-side output terminal selection signal Q can be input. In the state where P is input, the threshold value C is subtracted from the digital amount X each time the digital amount X is input during the actual operation, and the subtracted value (X−C) is positive, or X is compared with a threshold value C, and when the digital amount X is larger than the threshold value C, a mark detection signal is output from a plus side output terminal. When the negative output terminal selection signal Q is input, the digital amount X
Each time is input, the threshold value C is subtracted from the digital amount X and the subtraction value (X−C) is negative, or the digital amount X is compared with the threshold value C and the digital amount X is When the value is smaller than the threshold value C, a mark detection signal is output from the minus output terminal.

[Operation] The mark sensor 1 is not a conventional digital phototube that outputs 1 or 0, but an analog phototube that outputs, for example, in the range of 0 to 5 V according to the intensity of reflected light.

The analog amount (change in voltage) output from the mark sensor 1 is converted into a digital amount (the number of pulses) X by the A / D converter 2, and is always output to the control unit 3 and the comparator 4, respectively.

During the sensitivity adjustment operation, the control unit 3 takes in the digital amount X each time the film feed advances by 1 mm, and supplies the digital amount X to the comparator 4 to calculate the average of the digital amount X of the ground portion N at the edge of the wrapped paper W. The intermediate value (+) / 2 between the value and the average value of the digital amount X of the registration mark M is output as the threshold value C. When the average value is smaller than the average value, the plus side output terminal selection signal P is output. When the average value is greater than the average value, a negative output terminal selection signal Q is output.

The comparator 4 receives a threshold signal C from the control unit 3,
When either one of the two output terminal selection signals P or Q is received, calculation / determination becomes possible, and thereafter, the operation enters a state of waiting for a command to capture the digital quantity X.

Therefore, when this operation is started, the comparator 4 sets the digital amount X every time the wrapped paper W travels a minute predetermined pitch.
Take in the The comparator 4 subtracts the threshold value C from the digital amount X and determines whether the subtracted value (X−C) is a positive value or compares the digital amount X with the threshold value C to determine which is larger. .

When the comparator 4 receives the output terminal selection signal P from the control unit 3 in advance, the reflected light input to the mark sensor 1 indicates that the registration mark M Is stronger, so that when the registration mark M comes to the mark sensor 1, the calculation result is “subtraction value (X−C)”.
Is plus or digital amount X> threshold C, so that the mark detection signal R is output from the plus side output terminal 4c.

When the output terminal selection signal Q has been input in advance, the comparator 4 indicates that “the reflected light input to the mark sensor 1 is less than the registration mark M than the ground portion N of the wrapped paper W.
Is weaker ", so that in this case, when the registration mark M comes to the mark sensor 1, the calculation result is" the subtraction value (X-C) is minus ". Alternatively, the digital amount X <the threshold value C, and the mark detection signal S is output from the minus output terminal 4d.

As described above, there is a certain difference in the intensity of the reflected light or transmitted light detected by the mark sensor 1 between when the ground portion N of the wrapped paper W passes the sensor position and when the registration mark M passes. Thus, the passage of the registration mark M can be reliably detected in any wrapping paper.

Hereinafter, each embodiment will be described in a range that does not overlap with the description of the “means for solving the problem” described above.

FIG. 1 is a conceptual diagram of a wrapped paper registration mark detecting device with an automatic sensitivity adjustment function of a horizontal pillow wrapping machine, and FIG. 2 is a sensitivity diagram. FIG. 3 is a flowchart of the adjustment operation, and FIG. 3 is a flowchart of the main operation.

The output voltage of the mark sensor 1 is converted into a digital quantity (number of pulses) X by the A / D converter 2 and the digital quantity X
Always reaches the input port of the control unit 3 and the input port of the comparator 4 in parallel. The control unit 3 fetches the digital amount X during the automatic sensitivity adjustment operation and every time the film feed advances by 1 mm. A required operation is performed, and as a result, the signals C, P, and Q are output. The comparator 4 outputs one of the signal C and the signals P and Q output from the control unit 3 during the automatic sensitivity adjustment operation. One of them is taken into operation standby state, and when this operation is started, every time the film feed advances by 1 mm, the digital amount X is taken and the required calculation is performed, and the registration mark detection signal P or S is erroneously eliminated. The main controller 8 uses the mark detection signal to determine whether the registration mark M is displaced from the horizontal seal cut position. Do

 The details will be described below.

The mark sensor 1 is an analog photoelectric tube of a radiation type and a reflection type, and outputs in the range of 0V to 5V according to the intensity of reflected light.

The analog voltage output from the mark sensor 1 is
It depends on the light reflection characteristics of the wrapped paper W. For example, in the case of general wrapping paper in which the ground portion N at the edge of the wrapped paper is transparent and the registration mark M is black or brown, the ground portion N
Is higher than the output voltage at the time of the registration mark M. For example, in the case of the ground portion N, the output varies around 0.5V, and in the case of the registration mark M, the output varies around 3.5V. However, the output voltage at the time of the registration mark M may be higher than the output voltage at the time of the ground portion N. This is a case of special wrapping paper in which the intensity of reflected light is reversed because the edge of the wrapping paper is white, gold, or silver instead of transparent. For example, in the case of the ground portion N, the output varies around 4.5V, and in the case of the registration mark M, the output varies around 2V.

The mark sensor 1 is attached to the tip of a moving rod 6a of a linear actuator 6 driven by a step motor 5, and a motor driver 7 drives the step motor 5 by inputting a control signal of a main controller 8.

When the main switch 9a of the input device 9 is turned on, and then the automatic sensitivity adjustment switch 9b is turned on, a control signal is sent from the main control device 8 to the motor driver 7, and the step motor 5 is driven. The mark sensor 1 is moved so as to correspond to the edge. After turning on the main switch 9a, the packaging specification data is input from the key switch 9d before turning on the automatic sensitivity adjustment switch 9b. Then, the packaging specification data is displayed on the display device 10.

When the automatic sensitivity adjustment switch 9b is turned on, the mark sensor 1 emits light toward the edge of the wrapped paper W, inputs reflected light, outputs a voltage corresponding to the intensity of the reflected light, and displays the display. The character "Start automatic sensitivity adjustment of mark sensor" is displayed on device 10, and lamp 14 is turned on to indicate that automatic sensitivity adjustment has started.

After the lamp 14 is turned on, the main controller 8 sends a drive signal to the motor driver 15 to drive the paper-pulling-roll driving motor 12, so that the film is fed by the paper-pulling roll 11.

The main controller 8 also controls the rotation of the paper drawing roll 11 during rotation.
The pulse output from the rotary encoder 13 attached to the output shaft of the roll drive motor 12 is input and counted, and the timing at which the film feed advances by 1 mm can be accurately detected. Control unit 3
A digital signal X constantly input to the input port of the comparator 4 and the input port of the comparator 4 is output to the control section 3 so that the control section 3 captures the digital signal X during the automatic sensitivity adjustment operation.
At the time of the main operation in which the main operation switch 9c is turned on, an input signal U is output to the comparator 4 so as to be input by the comparator 4.

The control section 3 and the comparator 4 are both supplied with a drive current by turning on the automatic sensitivity adjustment switch 9b. However, only when the signal T or U comes from the main control device 8, the digital amount X is taken. Performs the calculation and outputs the required pulse.

The control unit 3 is constituted by a microcomputer having a ROM and a RAM. In the automatic sensitivity adjustment operation, the digital amount X is acquired every time the film feed advances by 1 mm based on the input of the acquisition signal T from the main control unit 8. When the deviation between the digital amount X taken first and the digital amount X taken ten times in succession thereafter is smaller than 1 volt, these digital amounts X are smaller than the ground portion N at the edge of the wrapped paper W. Is determined, the average value of these digital quantities X is obtained, and then the digital quantity X is fetched to obtain the average value A.
When the deviation from the count value is larger than 1 volt and the count value is counted up to 4 times by storing up to 4 times, these digital amounts X
Is determined to be a value corresponding to the registration mark M, the average value of these digital amounts X is obtained, the average value and the intermediate value (+) / 2 of the average value are calculated, and the intermediate value (+
) / 2 is output as the threshold value C.

Then, the control unit 3 outputs the plus side output terminal selection signal P when the average value is smaller than the average value when the average value is larger than the average value. The negative output terminal selection signal Q is output, and thereafter, a signal indicating the end of the calculation is sent to the main controller 8. When the main controller 8 receives the signal indicating the end of the calculation from the controller 3, the main controller 8 does not output a capture command signal T for capturing the digital quantity X to the controller 3 thereafter.
A rotation stop signal is output to the motor driver 15. Therefore, the control unit 3 stops taking in the digital amount X, and the paper drawing roll 11 stops rotating.

When the sensitivity adjustment operation is started, the control unit 3 determines that the ground portion N exists below the mark sensor 1 and the registration mark M
When the distance is far, each digital amount X taken from the beginning to the eleventh becomes a value corresponding to the ground portion N at the edge of the wrapping paper W, and an average value is calculated when the film feeding advances by 11 mm. After that, the registration mark M is displayed below the mark sensor 1.
The digital amount X captured before the image is read is ignored without being stored. When the film advance proceeds and the registration mark M comes below the mark sensor 1, the digital amount X captured at that time is an average value. Since it is larger than the digital amount corresponding to plus 1 volt, this is compared and determined and stored as a digital amount corresponding to the registration mark M. Thereafter, the digital amount corresponding to the registration mark M is increased every time the film feed advances by 1 mm. After storing the digital amount four times in total, calculate the average value of these digital amounts, then calculate and output the intermediate value C = (average value + average value) / 2, and output the positive side terminal. Either the selection signal P or the negative output terminal selection signal Q is output.

Also, near the upstream side of the mark sensor 1, for example, 20 mm
When the sensitivity adjustment operation is started in a state where the registration mark M is located at a distant place, the control unit 3 sets the film feed to 25 mm.
At this point, the intermediate value C is output, and at the same time, one of the positive output terminal selection signal P and the negative output terminal selection signal Q is output. As a result, the sensitivity adjustment operation is stopped in a very short time, and it is not necessary to output any waste paper.

When the sensitivity adjustment operation is started with the registration mark M positioned below the mark sensor 1, the control unit 3
In the above, the digital amount X having a deviation larger than 1 volt is input while the storage input of the digital amount X having a deviation smaller than 1 volt compared with the initially stored digital amount X is not counted ten times. . Therefore, in this case, the control unit 3 is programmed to cancel all the digital amounts X stored so far and start over from the beginning, and the registration mark M is set to the mark sensor 1.
, And again the digital quantity X corresponding to the ground portion N
, And thereafter, the digital amount X taken until the next registration mark M comes under the mark sensor 1 is ignored without being stored, and the next registration mark M passes through the mark sensor 1. At this time, the average value of the digital amount X corresponding to the registration mark M is obtained, and the sensitivity adjustment operation in this case is programmed so that the film is fed by the unit packaging length + 10 mm.

Therefore, when the mark sensor 1 is at the ground portion N, 0.5V
If it is assumed that the output is scattered before and after, and that the output of the registration mark M is scattered around 3.5 V, the control unit 3 calculates a digital value corresponding to approximately 0.5 V as an average value corresponding to the ground portion N. The average value corresponding to the registration mark M is calculated, a digital value corresponding to approximately 3.5 V is calculated, further, approximately 2 V is calculated as the intermediate value C, and the plus side output terminal selection signal P is output. Also, assuming that the output varies around 4.5 V in the case of the ground portion N and the output varies around 2 V in the case of the registration mark M, the control unit 3 calculates the average value corresponding to the ground portion N. Calculate the digital value corresponding to approximately 4.5V as
The average value corresponding to the registration mark M is calculated as a digital value corresponding to approximately 2 V, and further as an intermediate value C, approximately 3.25 V
Is calculated, and the negative output terminal selection signal Q is output.

The controller 3 outputs a signal indicating that the sensitivity cannot be adjusted to the main controller 8 when the digital amount X corresponding to the registration mark M is not input when the film has been advanced by the unit packaging length + 10 mm. Thereby, the main controller 8 stops the sensitivity adjustment operation, and performs an error display of "no mark" on the display device 10. Therefore,
The average value of the digital amount X corresponding to the ground portion N at the edge of the wrapping paper or the non-wrapping paper W without the register mark and the wrapping paper in which the digital amount X of the value corresponding to the register mark M is smaller than 1 volt are as follows. It can be determined that the registration mark cannot be detected.

After the sensitivity adjustment operation is completed, the main operation switch of the input device 9
When 9c is turned on, the digital amount X obtained by A / D conversion is taken into the comparator 4 every time the film feed signal is 1 mm, and a mark detection signal is output when the registration mark M passes below the mark sensor 1. You.

The comparator 4 includes a high-pass section 4a, a low-pass section 4b, a plus output terminal 4c, and a minus output terminal 4d.

Each of the high-pass unit 4a and the low-pass unit 4b receives the threshold signal C of the control unit 3 during the sensitivity adjustment operation, and outputs the digital amount X output from the A / D converter 2 during the main operation. W is input each time the vehicle travels at a minute predetermined pitch. Each time the digital amount X is input, the high-pass unit 4a compares the digital amount X with the threshold value C, and when the digital amount X is greater than the threshold value C, generates a one-pulse signal from an AND circuit. Output to the first input port of the plus side output terminal 4c. Each time the digital amount X is input, the low-pass unit 4b compares the digital amount X with the threshold value C and, when the digital amount X is smaller than the threshold value C, outputs a signal of one pulse by an AND circuit. Output to the first input port of the side output terminal 4d.

When the plus output terminal selection signal P is output from the control unit 3 during the sensitivity adjustment operation, the plus output terminal 4c is maintained at the second input port via the flip-flop 17. Whenever one pulse is input from the high-pass unit 4a to the first input port,
A one-pulse mark detection signal R is output from the output port.

Further, when the negative output terminal selection signal Q output from the control unit 3 during the sensitivity adjustment operation is output, the negative output terminal 4d is a flip-flop.
The input is maintained at the second input port via the line 18 and each time one pulse is input from the low-pass section 4b to the first input port, a one-pulse mark detection signal S is output from the output port. I do.

Therefore, when the mark sensor 1 is at the ground portion N, 0.5V
In the case where the output is varied before and after, and in the case of the registration mark M, the output is varied around 3.5V, the threshold value C set in each of the high-pass section 4a and the low-pass section 4b is a digital value corresponding to approximately 2V. Therefore, when the registration mark M passes through the mark sensor 1, one pulse is output from the high-pass unit 4a, and therefore, one pulse of the mark detection signal R is output from the plus side output terminal 4c.

In the case where the output varies around 4.5 V in the case of the ground portion N and the output varies around 2 V in the case of the registration mark M, the threshold values C set in the high-pass portion 4a and the low-pass portion 4b are Since the digital value corresponds to approximately 3.25 V, when the registration mark M passes through the mark sensor 1, one pulse is output from the low-pass unit 4b, and thus a one-pulse mark detection signal S is output from the minus output terminal 4d. I do.

Since the digital amount X is taken into the comparator 4 every time the wrapped paper W advances by 1 mm pitch, if the width of the registration mark M is 5 mm, when the registration mark M passes through the mark sensor 1, Mark detection signal R or S
Is output at a timing every time the wrapped paper W advances by 1 mm pitch, usually 4 pulses, rarely 5 pulses continuously, and, for example, the hair attached to the edge of the wrapped paper W When the output voltage of the mark sensor 1 greatly changes due to the passage, and the comparator 4 takes in the digital amount X at this time, one pulse is output, and these output pulses pass through the false signal eliminator 16. Sent to main controller 8.

Therefore, the erroneous signal eliminator 16 determines that the mark detection signal R or S output from the comparator 4 indicates that the wrapping paper W is 1 mm.
When three pulses are successively input at every timing when the pitch advances, it is determined that the registration mark M is genuinely passing below the mark sensor 1, and the main controller 8 is authenticated. One pulse is output as the mark detection signal, and the input of the fourth pulse from the comparator 4 or the input of only one pulse is ignored.

When the digital amount X corresponding to the registration mark M is not input at the time when the film has been advanced by the unit packaging length + 10 mm, the erroneous signal eliminator 16 is, like the controller 3, the main controller. 8 to output a signal that marks cannot be read,
As a result, the main control device 8 stops the main operation, and performs an error display of "no mark" on the display device 10.

Therefore, it is possible to determine the occurrence of a trouble such as when the film feeding cannot be performed smoothly, and it is possible to stop the main operation when the horizontal heater / cutting means is not closed. The erroneous signal eliminator 16 is appropriately provided to enhance the reliability of the device.

Thus, the main controller 8 inputs one pulse as a genuine mark detection signal from the false signal eliminator 16 and
An origin signal corresponding to the seal cut timing is input, and the phase shift between the two signals is constantly compared and calculated, and the registration mark at the edge of the wrapped paper is moved forward or backward from the end seal cut position in the transport direction. For example, when it is shifted by 3 mm or more,
A control signal to which a necessary correction necessary for eliminating the deviation is added is output to the motor driver 15 so that the rotation of the paper drawing roll 11 is adjusted to be slower or faster.

[Second embodiment ... FIG. 4] This embodiment shows another configuration of the comparator 4.

The comparator 4 receives the threshold signal C of the control unit 3 during the sensitivity adjustment operation, and the A /
The digital amount X output from the D converter 2 is input every time the film to be wrapped W advances by 1 mm in the film feed distance. Each time, the threshold value C is subtracted from the digital amount X in the subtraction unit 4e. The subtraction value (XC) is input to the plus judgment unit 4f and the minus judgment unit 4g, respectively, and when the subtraction value (XC) is a plus value, a signal of one pulse is output from the plus judgment unit 4f to an AND circuit. To the first input port of the plus side output terminal 4c, and when the subtraction value (XC) is a minus value, the minus determination unit 4g outputs one pulse signal to the minus side output terminal 4d consisting of an AND circuit. Output to the first input port.

When the plus side output terminal selection signal P is output from the control unit 3 shown in FIG. 1 during the sensitivity adjustment operation, the plus side output terminal 4c keeps the signal P input to the second input port via the flip-flop 17. During the actual operation, the registration mark comes under the mark sensor 1, and every time one pulse is input from the plus determination unit 4f to the first input port, one mark is output from the output port. The detection signal R is output.

When the negative output terminal selection signal Q output from the control unit 3 shown in FIG. 1 is output during the sensitivity adjustment operation, the negative output terminal 4d is connected to the second output terminal via the flip-flop 18. Since the input is maintained at the input port, the registration mark comes below the mark sensor 1 during the actual operation, and every time a pulse is input to the first input port from the minus determination unit 4g, the output port is output. Then, a one-pulse mark detection signal S is output.

[Peripheral range of the present invention] (1) The main control device 8 detects the registration mark from the comparator 4 in a bag making and packaging machine or a bag making machine that continuously moves the paper to be wrapped, such as a horizontal pillow wrapping machine. While inputting the signal, the origin signal of the motor that drives the horizontal seal cutter is to be input, and it is constantly being monitored whether the time difference between the input of the two signals is within a certain value and exceeded. In some cases, a signal to adjust the rotation speed of the motor that drives the film feed roll to eliminate the displacement is output to the motor driver, but a vertical pillow packaging machine or an wrapping machine such as a steamed bun packaging machine In a bag making and packaging machine or a bag making machine that intermittently moves the paper to be wrapped as described above, when a registration mark detection signal is input from the comparator 4, the film feed roll is driven. That the motor is stopped, it adapted to provide a cut start signal to the cutting means for cutting the object wrapper.

(2) The mark sensor 1 may use a type separated into a light emitting element and a light receiving element. The mark sensor 1 of the embodiment uses a voltage change output type photoelectric tube commercially available from a sensor manufacturer. However, if the sensor sensor is developed and marketed in the future, the current change output type or the frequency A variant analog mark sensor can be used.

[Effects of the Invention] As described above, according to the wrapped paper registration mark detection device with an automatic sensitivity adjustment function in the packaging machine and the bag making machine of the present invention, an analog mark is used instead of a conventional digital mark sensor. It uses a sensor and does not adjust the output of the sensor itself before the main operation, but performs the automatic sensitivity adjustment operation only for a very short time before the actual operation to respond to the ground part and the registration mark. Appropriately input sensor signals to the controller, calculate and determine which signal is the registration mark detection signal, and input the necessary information appropriately during the actual operation with the sensor signal corresponding to the ground part and the registration mark Then, a comparator that immediately determines which signal is the registration mark detection signal is correctly set in advance. Sir signal is a comparator whether any of the detection signals of the land portion and the registration mark is surely Undetermined output authentic registration mark detection signal, troublesome is eliminated in a conventional sensitivity adjustment.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram including a hardware circuit when applied to a horizontal pillow wrapping machine as a first embodiment of a wrapped paper registration mark detection device with an automatic sensitivity adjustment function in a wrapping machine and a bag making machine of the present invention. FIG. 2 is a flowchart of the sensitivity adjustment operation, and FIG. 3 is a flowchart of the main operation. FIG. 4 is a hardware circuit showing a main part of the second embodiment of the present invention. W: wrapped paper, M: registration mark, N: ground part of wrapped paper 1 ... mark sensor, 2 ... A / D converter, 3 ... control unit, 4 ... comparator, 4a ... … High-pass section, 4b… Low-pass section 4c… Plus output terminal, 4d… Negative output terminal, 4e… Subtraction section, 4f… Plus judgment section, 4g… Negative judgment section,

Claims (3)

(57) [Claims] 1. A difference between the intensity of reflected light or transmitted light between a ground portion N of a wrapped paper W and a registration mark M is output in an analog amount. A / D converter 2 for converting an analog amount output from the mark sensor 1 into a digital amount X, and a digital amount X output from the A / D converter 2 during the sensitivity adjustment operation. A control unit 3 which inputs and calculates a wrapping paper W every time the wrapping paper W runs a minute predetermined pitch and outputs a required control signal.
A required control signal of the control unit 3 is input, and a digital amount X output from the A / D converter 2 at the time of actual operation is input each time the wrapped paper W travels a minute predetermined pitch, and the calculation is performed. And a comparator 4 for outputting a mark detection signal. The control unit 3 first calculates the average value of the digital amount X of the other portion N of the edge of the wrapped paper W that has deviated from the registration mark M. Then, the digital amount X is input each time the wrapped paper W travels a minute predetermined pitch, and the average value of the digital amount X of the registration mark M is obtained. The intermediate value (+) of the average value and the average value / 2, and outputs the intermediate value (+) / 2 as the threshold value C, outputs the plus side output terminal selection signal P when the average value <the average value, and outputs the average value> the average value. Output the negative side output terminal selection signal Q and output each signal of C, P and Q. After that, the digital amount X is configured not to be input, and the comparator 4 can receive the threshold signal C, the positive output terminal selection signal P, and the negative output terminal selection signal Q. The threshold value signal C and the plus side output terminal selection signal P are electrically connected to the control unit 3 as described above.
Is input, the threshold C is subtracted from the digital quantity X every time the digital quantity X is input during the actual operation, and the subtracted value (X−C) is plus, or the digital quantity X And the threshold value C is compared. When the digital amount X is larger than the threshold value C, a mark detection signal is output from a plus side output terminal. When the side output terminal selection signal Q is input, the threshold value C is subtracted from the digital amount X each time the digital amount X is input during the actual operation, and the subtraction value (X−C) is negative. Or comparing a digital amount X with a threshold value C and outputting a mark detection signal from a minus output terminal when the digital amount X is smaller than the threshold value C. Packaging machine and bag making Packaging machine registration mark detection device with automatic sensitivity adjustment function of the machine. 2. The comparator 4 inputs a threshold signal C of the control unit 3 during the sensitivity adjustment operation, and outputs the digital amount X output from the A / D converter 2 during the main exercise to the wrapping paper W. Is input every time the vehicle travels a minute predetermined pitch,
Each time, the digital amount X is compared with the threshold value C, and when the digital amount X is larger than the threshold value C, a high-pass section 4a that outputs a one-pulse signal, A low-pass section 4b for outputting a one-pulse signal when smaller than C; a plus-side output terminal 4c comprising an AND circuit adapted to receive the signal from the high-pass section 4a and the plus-side output terminal selection signal P; 2. The packaging according to claim 1, wherein the package comprises a low-pass section 4b and a minus-side output terminal 4d comprising an AND circuit adapted to receive a minus-side output terminal selection signal Q. Wrapped paper registration mark detection device with automatic sensitivity adjustment function for papermaking and bag making machines. 3. The comparator 4 inputs a threshold signal C of the control unit 3 during a sensitivity adjustment operation, and outputs a digital amount X output from the A / D converter 2 during a full operation to the wrapping paper W. Is input every time a small predetermined bitch runs,
Each time, a subtraction unit 4e that subtracts the threshold value C from the digital amount X, and 1 when the subtraction value (X−C) is a plus value.
A plus determining unit 4f that outputs a pulse signal; a minus determining unit 4g that receives the subtracted value (XC) and outputs a one-pulse signal when the value is a negative value;
A positive output terminal 4 comprising an AND circuit adapted to input the signal 4f and the positive output terminal selection signal P
and a negative output terminal 4d comprising an AND circuit adapted to input the negative output terminal selection signal Q of the signal of the negative determination unit 4g. 2. The wrapped paper registration mark detection device with an automatic sensitivity adjustment function of the packaging machine and the bag making machine according to 1.