JP3953555B2 - Wrapping paper registration mark detection device with automatic sensitivity adjustment function of packaging machine and bag making machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an automatic packaging machine and bag making machine that can output a registration mark detection signal by clearly discriminating the registration mark of the edge of the wrapping paper from the ground portion without malfunction during the actual operation of the packaging machine or bag making machine. The present invention relates to a wrapping paper registration mark detection device with a sensitivity adjustment function.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a packaging machine or a bag making machine, a registration mark on an edge of a paper to be wrapped is detected during its operation. One of the technical significances thereof is that it is used as a misalignment detection signal when the registration mark on the edge of the wrapping paper deviates from the end seal cut position. In detail, in the horizontal bag making filling and packaging machine, when the registration mark displayed on the edge of the wrapping paper reaches about 2 to 4 mm in the longitudinal direction of the wrapping paper from the end seal cut position, Since it is determined that the deviation has become excessive, it is necessary to correct the deviation by adjusting the rotation of the paper drawing roll.
For this reason, the passage of the registration mark is detected by the photoelectric sensor during operation, and the main control device detects the detection signal and the passage of the protrusion attached to the cutter shaft of the end seal cutting means by the proximity sensor. An origin signal corresponding to the timing of the obtained seal cut is input. The main control device constantly compares and calculates the phase shift between the two signals, and if the phase shift exceeds the upper limit or lower limit of a certain range, the control signal is added with the necessary corrections necessary to eliminate the phase shift. Is output to the motor driver to adjust the rotation of the paper pulling roll to be slower or faster.
Another technical significance of detecting the registration mark is that the edge of the wrapping paper is used in a vertical bag making and filling machine and a bun wrapping machine that rolls the wrapping paper intermittently using roll paper as the wrapping paper. This is because when the registration mark exactly matches the end seal cut position, the registration mark is used as a timing signal for stopping the wrapping paper without causing a feed shift.
Conventionally, a mark sensor that uses a digital phototube with a dial whose output signal is 1/0 and whose sensitivity can be adjusted by turning the dial by hand must always be at the edge of the edge of the wrapping paper. Align the mark sensor and turn the dial to read the first dial memory when the sensor signal changes from 0 to 1, and turn the dial with the registration mark aligned with the mark sensor and the sensor signal changes from 1 to 0 The second dial memory is read, dial adjustment is performed to match the dial to the approximate middle value of the two dial memories, and “0” is set as the sensor signal for the ground portion during actual operation, and the sensor signal when the registration mark comes The sensitivity is adjusted to effectively obtain “1”. However, this adjustment work takes time and is very troublesome.
On the other hand, as shown in JP-A-2-282006 and JP-A-2-282007, the applicant of the present application has developed an invention capable of automatically adjusting the sensitivity of the mark sensor. In this invention, if an analog type mark sensor is used and the automatic sensitivity adjustment switch is turned on, the film is fed by a very short length, and the change in the sensor signal during that time is read and the ground portion of the edge of the wrapping paper is detected. Check the registration mark, enter the actual operation standby state, and turn on the main operation switch, you can reliably determine whether the sensor signal is the detection signal of the ground part or the registration mark. It is a wrapping paper registration mark detection device with an automatic sensitivity adjustment function.
[0003]
[Problems to be solved by the invention]
According to the invention disclosed in the above Japanese Patent Laid-Open Nos. 2-282006 and 2-282007, the mark detection signal is obtained by performing A / D conversion on the analog signal, which is a sensor signal, during the actual operation, and then calculating by the comparator. May cause a time lag in mark detection. Due to the time lag, it has been found that the correction of the registration mark misalignment cannot catch up with the supply of the wrapping paper during high-speed packaging, resulting in problems.
[0004]
The present invention has been devised to solve the above-mentioned problems. The purpose of the present invention is to adopt an analog mark sensor, and when automatic sensitivity adjustment is performed, a digital signal is used to distinguish between the ground portion of the edge of the wrapping paper and the registration mark. In the actual operation, the sensor signal is reliably determined whether it is the detection signal of the ground portion or the registration mark. In particular, during the actual operation, the registration mark is processed by analog signals without performing A / D conversion. By providing a wrapping paper registration mark detection device with automatic sensitivity adjustment function of a packaging machine and a bag making machine that can correct the registration mark misalignment even during high-speed packaging, so that there is no time lag in detection is there.
[0005]
[Means for Solving the Problems]
The wrapping paper registration mark detecting device with automatic sensitivity adjustment function of the packaging machine and bag making machine according to the present invention irradiates light to the edge of the wrapping paper where the registration marks are displayed at predetermined intervals on the ground portion. A photoelectric sensor that receives reflected light or transmitted light and outputs an analog signal corresponding to the amount of light, and each analog from the photoelectric sensor corresponding to the ground portion and the registration mark of the wrapping paper during sensitivity adjustment operation An A / D converter that converts the adjustment signal into a digital adjustment signal and outputs it, and calculates the average value of the two digital adjustment signals from the A / D converter during the sensitivity adjustment operation and the digital signal during the main operation A control device that outputs an average signal, a D / A converter that converts the digital average signal from the control device into an analog average signal and outputs the analog average signal; And a comparator for outputting an analog comparison signal performs calculation based on the said analog average signal from an analog signal the D / A converter, the control device, the analog comparison signal from the comparator at the time of the operation The registration mark is detected based on the above.
[0006]
According to the wrapping paper registration mark detection device with automatic sensitivity adjustment function of this packaging machine and bag making machine, an automatic sensitivity adjustment operation is performed in a very short time so that the film feed advances by the unit packaging length prior to the main operation. As a result, the photoelectric sensor emits light to the edge of the wrapping paper where registration marks are displayed at predetermined intervals on the ground, receives the reflected or transmitted light, and outputs an analog adjustment signal according to the amount of light To do. The A / D converter converts the analog adjustment signal from the photoelectric sensor into a digital adjustment signal and outputs it during the sensitivity adjustment operation.
That is, when the ground portion of the wrapping paper is irradiated with light, a digital conversion value corresponding to the ground portion is output, and when the registration mark is irradiated with light, a digital conversion value corresponding to the registration mark is output. The control device receives two digital adjustment signals output from the A / D converter, calculates an average value of the digital conversion values, and outputs a digital average signal indicating the average value during the actual operation. The D / A converter converts the digital average signal output from the control device into an analog average signal and outputs the analog average signal. The comparator receives the analog signal output from the photoelectric sensor during the actual operation and the analog average signal converted by the D / A converter, performs an operation, and outputs an analog comparison signal. The control device performs registration mark detection in response to an analog comparison signal input from the comparator during the actual operation .
As described above, according to the present registration mark detection device, there is an individual relative difference between the intensity of the reflected light or transmitted light of the mark sensor between the ground portion of the edge of the wrapping paper and the registration mark. The registration mark automatic sensitivity adjustment operation can be accurately performed by digital signal processing. During this operation, the registration mark on the edge of the wrapping paper can be clearly distinguished from the ground without malfunction by analog signal processing. Register marks can be detected. In particular, the analog signal that is the sensor signal is not A / D converted during the actual operation, so that there is no time lag in mark detection, and the registration mark misalignment can be corrected well even during high-speed packaging.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1, FIG. 2 (a), (a), the packaging paper registration mark detection apparatus (henceforth "registration mark detection apparatus") with the automatic sensitivity adjustment function of the packaging machine and bag making machine concerning embodiment of this invention. This will be described with reference to FIGS. 3 (a), 3 (b), and 3 (c). FIG. 1 is a conceptual diagram according to an embodiment of a registration mark detection apparatus according to the present invention, showing a main part of a packaging machine and a block circuit for detecting registration marks. 2A is a diagram showing the output voltage of the photoelectric sensor during the automatic sensitivity adjustment operation, FIG. 2B is a diagram showing the analog voltage and the comparator voltage input from the photoelectric sensor to the comparator during the main operation, and FIG. ) Is a diagram showing an analog voltage that the comparator in the actual operation compares and outputs to the control device. 3A is a diagram showing the output voltage of the photoelectric sensor during the automatic sensitivity adjustment operation, FIG. 3B is a diagram showing the analog voltage and the comparator voltage input from the photoelectric sensor to the comparator during the main operation, and FIG. ) Is a diagram showing an analog voltage that the comparator in the actual operation compares and outputs to the control device.
[0008]
As shown in FIG. 1, the registration mark detection apparatus includes a photoelectric sensor 1, an A / D converter 2, a D / A converter 3, a comparator 4, and a control device 8. The photoelectric sensor 1 is a reflective (or transmissive) analog phototube, and is attached to the tip of a moving rod 6a of a linear actuator 6 using a step motor 5 as a drive source. The motor driver 7 inputs a control signal from the control device 8 and drives the step motor 5. More specifically, when the packaging specification data is input from the key switch 9d and the automatic sensitivity adjustment switch 9b is turned on after the main switch 9a of the input device 9 is turned on, a control signal is sent from the control device 8 to the motor driver 7. The step motor 5 is driven. The linear actuator 6 is actuated by driving the step motor 5, and the photoelectric sensor 1 is moved so as to correspond to the edge of the wrapping paper W. The packaging specification data is displayed on the display device 10.
[0009]
When the automatic sensitivity adjustment switch 9b is turned on, the letters “photoelectric sensor automatic sensitivity adjustment start” are displayed on the display device 10, and the lamp 14 is turned on, indicating that automatic sensitivity adjustment has started. The photoelectric sensor 1 emits light toward the edge of the wrapping paper W, receives the reflected light as an input, and outputs an analog voltage as an analog adjustment signal corresponding to the intensity of the reflected light. At this time, when the ground portion N of the wrapping paper W is irradiated, the analog voltage when the reflected light is received is a ₁ , and when the registration mark M is irradiated, the analog voltage when the reflected light is received is a ₂ To do. Analog voltages a _1, a ₂ output from the photoelectric sensor 1 is input to the A / D converter 2 and the co lymph regulator 4. The A / D converter 2 is a converter that converts an analog adjustment signal into a digital adjustment signal and outputs the digital adjustment signal. The photoelectric sensor 1 irradiates the ground portion N of the wrapping paper W and receives the reflected light and outputs the light. to an analog voltage a ₁ into a digital signal b _1, also converts an analog voltage a ₂ photoelectric sensor 1 outputs by receiving the reflected light is irradiated to the registration marks M on the digital signal b _2. Then, output voltages b ₁ and b ₂ as digital adjustment signals output from the A / D converter 2 are input to the control device 8.
[0010]
The control device 8 sends a drive signal to the motor driver 15 for the paper drawing roll drive motor 12 after the lamp 14 is turned on. As a result, the paper pulling roll driving motor 12 is driven and the paper pulling roll 11 feeds the film.
[0011]
During the automatic sensitivity adjustment operation, the control device 8 receives a pulse output from the rotary encoder 13 attached to the output shaft of the roll driving motor 12 when the paper pulling roll 11 is rotated. The pulse is counted and the timing is accurately detected every time the film feed advances by 1 mm. The control device 8 outputs a digital quantity (output voltage b ₁₎ as a digital adjustment signal output from the A / D converter 2 every time the film feed advances by 1 mm. , B ₂ ) And the binary output signals (digital converted values) b ₁ and b ₂ from the A / D converter ₂ The average value c [= (b ₁ + b ₂ ) / 2] is calculated, and the average value c which is a digital value during the actual operation is output as a digital average signal. The actual digital average signal is obtained by further averaging the average value calculated every time the film feed advances by 1 mm. The control device 8 ignores the input of the signal output from the comparator 4 during the automatic sensitivity adjustment operation, and receives the input of the signal output from the A / D converter 2 during the main operation. Ignore it.
[0012]
For analog voltage a _1, a _2, which is outputted from the photoelectric sensor 1, depending on the type of the wrapping paper W, analog voltage output corresponding to the analog voltage and registration mark M to be outputted corresponding to the land portion N and Is reversed. The photoelectric sensor 1 is a reflective (or transmissive) analog phototube, and outputs 1 volt or 3 volt depending on the intensity of received light. The output voltage varies depending on the characteristics of the wrapping paper W.
Specifically, in the case of a general wrapping paper in which the ground portion N of the edge of the wrapping paper W is transparent and the registration mark M is black or brown, the output voltage at the registration mark M is the ground portion. It is higher than the output voltage when N. For example, when the ground portion is N, the output is about 1.0 volts, and when the registration mark is M, the output is about 3.0 volts. However, the output voltage at the registration mark M may be higher than the output voltage at the ground portion N. This is the case of special wrapping paper in which the intensity of the reflected light is reversed because the edge of the wrapping paper is not transparent but white, gold or silver. For example, the output is about 3.0 volts for the ground portion N, and about 1 volt for the registration mark M.
The present invention can be processed regardless of the type of paper to be wrapped. Specific examples are shown below. First, as shown in FIGS. 1 and 2A, during the automatic sensitivity adjustment operation, when the light of the photoelectric sensor 1 irradiates the ground portion N of the wrapping paper W, the photoelectric sensor 1 outputs an analog signal of 1 volt. It is assumed that the photoelectric sensor 1 outputs an analog signal of 3 volts when the registration mark M is irradiated with light from the photoelectric sensor 1 . In this case, during the actual operation, as shown in FIGS. 1 and 2B, when the light of the photoelectric sensor 1 irradiates the ground portion N of the wrapping paper W, the photoelectric sensor 1 outputs an analog signal of 1 volt. When the light is output to the comparator 4 and the registration sensor M is irradiated with light from the photoelectric sensor 1, the photoelectric sensor 1 outputs an analog signal of 3 volts to the comparator 4.
In this way, an analog voltage having a high value of 3 volts and a low value of 1 volt is input to the plus-side input terminal of the comparator 4, and the digital average signal c [= (b ₁ + b ₂ ) / 2] = 2 volts are entered analog voltage 2 volts is converted into an analog average signal by a D / a converter 3 to the negative input terminal of the comparator 4. That is, the D / A converter 3 converts the digital average signal c from the control device 8 into an analog average signal (analog voltage) and outputs it.
As shown in FIG. 2C, the comparator 4 compares the rectangular waves a ′, b ′, c ′, d ′, e ′, f ′ (the rectangular waves a, b, c in FIG. 2B). , D, e, and f). The rectangular waves a ′, b ′, c ′, d ′, e ′, and f ′ have a power supply voltage (= e0 volts) between c ′ and d ′, and between e ′ and f ′. 'Between 0 volts. That is, the high value is the power supply voltage (= e0 volt) and the low value is 0 volt.
Next, as shown in FIGS. 1 and 3A, during the automatic sensitivity adjustment operation, when the light of the photoelectric sensor 1 irradiates the ground portion N of the wrapping paper W, the photoelectric sensor 1 is 3 volts . outputs an analog signal, when the light of the photoelectric sensor 1 is irradiated to the registration mark M is a photoelectric sensor 1 outputs an analog signal of 1 volt. In this case, during the actual operation, as shown in FIG. 1 and FIG. 3B, when the light of the photoelectric sensor 1 irradiates the ground portion N of the wrapping paper W, the photoelectric sensor 1 is 3 volts . An analog signal is output to the comparator 4, and when the light of the photoelectric sensor 1 irradiates the registration mark M, the photoelectric sensor 1 outputs an analog signal of 1 volt to the comparator 4.
Such a square-wave analog voltage is input to the positive input terminal of the comparator 4, and the digital average signal c [= (b ₁ + b ₂ ) / 2] = 2 volts calculated by the control device 8 is D / A converted. since the analog voltages of 2 volts to the negative input terminal of which is converted into an analog average signal comparator 4 are entered by the vessel 3, the comparator 4, a rectangular wave g was comparator as shown in FIG. 3 (c) ', h ′, i ′, j ′, k ′, l ′ (corresponding to the rectangular waves g, h, i, j, k, l in FIG. 3B) are output. That is, the rectangular waves g ′, h ′, i ′, j ′, k ′, and l ′ have a power supply voltage (= e0 volt) between g ′ and h ′ and between k ′ and l ′, and i ′. -J 'is 0 volts.
[0013]
The comparator 4 receives the analog signal (voltage) a output from the photoelectric sensor 1 and the analog signal (voltage) d as an analog average signal output from the D / A converter 3 during the actual operation. is, the analog voltage a _1, a ₂ and the analog signal (voltage) d was compared, without time loss, the controller an analog voltage e shown in FIG. 3 (b) or FIG. 3 (c) as an analog comparison signal 8 Output to.
[0014]
Therefore, the control device 8 inputs the analog voltage e output from the comparator 4 during the actual operation, detects a voltage change, detects a mark, and inputs an origin signal corresponding to the timing of the seal cut, thereby detecting the mark. This is necessary to eliminate the deviation when the registration mark on the edge of the wrapping paper is deviated from the end seal cut position forward or backward by, for example, 3 mm or more. A control signal with the required correction is output to the motor driver 15 to adjust the rotation of the paper drawing roll 11 to be slower or faster.
[0015]
【The invention's effect】
As described above, according to the registration mark detection device of the present invention, during the sensitivity adjustment operation, each analog adjustment signal from the photoelectric sensor corresponding to the ground portion of the wrapping paper and the registration mark is A / D converted. Is converted into a digital adjustment signal by the controller, the average value of the two digital adjustment signals from the A / D converter is calculated by the control device , and enters into the operation standby state, and is controlled by the D / A converter during the operation. the digital average signal from the device and outputs the converted analog average signal, Se analog signal is Nsa signal so as not to convert a / D, analog average signal of the analog signal comparator is a sensor signal and the set value Are compared, and the compared analog comparison signal is input to the control unit, so the mark is detected so that no time lag occurs. The registration mark misalignment can be corrected in real time even during high-speed packaging.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram according to an embodiment of a wrapping paper registration mark detection device with an automatic sensitivity adjustment function of a packaging machine and a bag making machine according to the present invention.
FIG. 2 is a diagram showing a change in voltage when the voltage output from the photoelectric sensor is higher than when a ground portion is detected when a registration mark on the wrapping paper is detected.
FIG. 3 is a diagram showing a change in voltage when the voltage output from the photoelectric sensor is lower than when a ground portion is detected when a registration mark on the wrapping paper is detected.
[Explanation of symbols]
W: Wrapped paper N ... Ground part M ... Registration mark 1 ... Photoelectric sensor 2 ... A / D converter 3 ... D / A converter 4 ... Comparator 8 ··Control device

Claims (1)

Sensitivity adjustment with a photoelectric sensor that emits light to the edge of the wrapping paper where registration marks are displayed at predetermined intervals on the ground, receives the reflected or transmitted light, and outputs an analog signal according to the amount of light An A / D converter that converts each analog adjustment signal from the photoelectric sensor corresponding to each of the ground portion and the registration mark of the wrapping paper during operation into a digital adjustment signal, and during the sensitivity adjustment operation converting a control device that outputs the digital average signal when the calculated and the driving mean value of the two said digital adjustment signal from the a / D converter, the digital average signal from the controller into an analog average signal And performing an operation based on the D / A converter to be output and the analog signal from the photoelectric sensor and the analog average signal from the D / A converter during the actual operation. And a comparator for outputting analog comparison signal, the control device, the automatic sensitivity of the packaging machine and bag making machine consists of detecting the registration mark on the basis of the analog comparison signal from the comparator at the time of the operation Wrapped paper registration mark detection device with adjustment function.

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