JP6691383B2 - Toilet device and film sealing device - Google Patents

Description

  The present invention relates to a toilet device and a film sealing device.

  For toilet devices such as temporary toilets and mobile toilets, excrement (hereinafter referred to as contents) is put in a thermoplastic tubular film, which is sealed by a film sealing device with a heater and further cut. In some cases, the contents are individually packaged.

  In this type of toilet device, when sealing a film, the film is narrowed down by an actuator, and is held and sealed by a heater and a pressure-bonding portion that presses the film against the heater. Therefore, the held films have different thicknesses of the films depending on the positions, and thus the thickness varies, and the temperature control of the heater is an important factor in ensuring the airtightness of the seal. This is because if the temperature is too high or too low, the film will tear or the seal will be incomplete.

  In this regard, there has been proposed a sealing device that includes a temperature detector that detects the temperature of the heater portion and that controls the temperature of the heater based on the temperature detected by the temperature detector.

  However, depending on this device, the cost of the temperature detector is high, and the manufacturing cost of the entire toilet device is high.

Patent No. 4470859

  An object of the present invention is to provide a toilet device that reliably seals a film without using a temperature detector and has a low manufacturing cost.

  In order to solve the above-mentioned problems, the toilet device according to the present invention includes a toilet seat portion, a film feed roller that is disposed below the toilet seat portion, and sends out a tubular film formed of a thermoplastic resin, and the film is narrowed down. A narrowing portion, a heater for heating the film, a pressure bonding portion for pressing the film to the heater, a heater resistance value detecting portion for detecting a resistance value of the heater, and the resistance detected by the heater resistance value detecting portion. A control unit that controls the heater based on a value.

  According to the present invention, it is possible to provide a toilet device that reliably seals a film and is inexpensive to manufacture.

The perspective view which shows an example of the toilet device to which this invention is applied. The figure which shows the structural example of the sealing device of this invention. The figure which shows the sealing operation | movement of the sealing device of FIG. The block diagram which shows the structure of the toilet device of this invention. The figure which shows the circuit structural example of a heater resistance detection part. 6 is a flowchart showing a film cutting operation by the control unit. The state transition diagram which shows the state of a heater. The timing chart which shows the output signal of the interval timer in the heating mode, and the sampling timing of voltage / current measurement. The timing chart which shows the output signal of the interval timer in the cooling mode, and the sampling timing of voltage / current measurement. Explanatory drawing which expanded the operation | movement of the heater electric current / voltage measurement in FIG. 9 typically, and was displayed.

  Hereinafter, a film sealing device and a toilet device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a toilet device 1 according to this embodiment. As shown in FIG. 1, a toilet device 1 includes a main body 11 having a film sealing device (hereinafter referred to as a sealing device 2) inside, a toilet seat 12 installed on the upper surface of the main body 11, and a toilet seat 12. And an instruction controller 14 for giving an instruction to the mechanism of the main body portion 11.

  FIG. 2 is a diagram showing the configuration of the sealing device 2. In FIG. 2, the state before the sealing operation is illustrated. As shown in FIG. 2, the sealing device 2 includes a film feed roller 201, a first actuator 203 and a second actuator 204, a heater 205, a pressure bonding section 206, and a cutting roller 207.

  The film 210 has a tube shape, is folded and arranged in a state of being opened around the opening 13, and the tip end is pulled out below the opening. The film 210 is formed of a thermoplastic resin.

  The film feed roller 201 is arranged below the opening 13 in pairs with the driven feed roller 202 that is driven and rotated. The film feed roller 201 is rotated in the direction indicated by the arrow X1 by the film feed motor M1. One pair of the film feed roller 201 and the pair of driven feed rollers 202 are arranged at both ends of the film 210 in the width direction.

  The first actuator 203 and the second actuator 204 (hereinafter, also referred to as a narrowing portion) are arranged below the film feed roller 201. The first actuator 203 and the second actuator 204 have a shape having a recess in the center in a plan view, and the recesses are arranged to face each other. The first actuator 203 and the second actuator 204 operate to squeeze the film 210 into this recess. The first actuator 203 is fixed, and the second actuator 204 is displaced toward the first actuator 203 by the driving unit D1, so that the opening diameter of the film 210 is narrowed by the first actuator 203 and the second actuator 204. .

  The heater 205 is arranged below the narrowed portion. The heater 205 has a heating portion at the tip on the film 210 side. The pressure-bonding portion 206 is made of a heat-resistant resin and presses the film 210 narrowed down by the driving portion D1 toward the heater 205.

  The cutting roller 207 is arranged immediately below the heater 205 in combination with a driven cutting roller 208 that is driven and rotated. The cutting roller 207 is rotated in the direction of arrow X4 shown in FIG. 3 by the roller motor M2. The driven cutting roller 208 is displaced in the direction of the cutting roller 207 by the drive unit D1. Here, the second actuator 204, the pressure-bonding section 206, and the driven cutting roller 208 are interlocked with each other to be displaced by the driving section D1.

  FIG. 3 is a diagram for explaining the sealing operation of the sealing device 2. As shown in FIG. 3, when sealing the film 210, the film feed roller 201 is stopped first. Next, the second actuator 204, the pressure-bonding section 206, and the driven cutting roller 208 are displaced in the arrow direction (leftward in FIG. 3) by the driving section D1. The narrowing portion narrows down the film 210, and the pressure bonding portion 206 presses the film 210 in the direction of the heater 205 shown by the arrow X2. The driven cutting roller 208 is pressed in the direction of the cutting roller 207 indicated by the arrow X3 by the drive unit D1.

  Here, the heating operation for sealing and cutting is performed by the heater 205. The portion of the heater 205 where the film 210 is cut has a sharper tip than the portion where the film 210 is sealed, and the temperature is higher. Then, the heater 205 is cooled to the solidification temperature of the resin after sealing and cutting. After that, the cutting roller 207 rotates in the drawing direction of the film 210 shown by the arrow X4, and the film 210 cut in the state where the contents are sealed naturally drops downward as shown by the arrow X5.

  FIG. 4 is a block diagram showing the configuration of the main body 11 including the seal device 2 installed in the toilet device 1 and the instruction controller 14. As shown in FIG. 4, the instruction controller 14 includes a film feed switch 411 for instructing the control unit 401 of the main body unit 11 to feed the film 210 and a cut switch for instructing the control unit 401 of the main body unit 11 to cut the film 210. 412 and.

  The main body 11 includes a control unit 401 including an arithmetic unit such as a microcomputer or a CPU (central processing unit), a film feed motor M1, a drive unit D1, a roller motor M2, a heater 205, and a heater resistance value detection unit. And 402.

  The heater resistance value detection unit 402 detects a voltage value applied to the heater 205 and a current value flowing through the heater 205, and outputs the detected voltage value to the control unit 401. The control unit 401 calculates the resistance value of the heater 205 based on the voltage value and the current value detected by the heater resistance value detection unit 402, and further calculates the temperature of the heater 205 based on the calculated resistance value. Then, the control unit 401 controls the temperature of the heater 205 based on the calculated temperature.

  FIG. 5 is a diagram showing a circuit configuration example of the heater resistance value detection unit 402. As shown in FIG. 5, the heater 205 has one end connected to the power supply 508. The other end of the heater 205 is connected to a switching element 505 such as a MOS FET (field effect transistor). Here, an example in which the switching element 505 is an n-type MOS FET will be described. The drain terminal of the switching element 505 is connected to the other end of the heater 205, the source terminal is connected to a current detection resistor 507 whose one end is grounded, and the gate terminal is connected to the output terminal OUT of the detection unit control unit 501.

  The control unit 401 may also serve as the detection unit control unit 501. Hereinafter, the control unit 401 and the detection unit control unit 501 may be collectively referred to as the control unit 401.

  A current amplifier 506 is connected to the current detection resistor 507, and the current value I amplified by the current amplifier 506 is input from the input terminal of the first A / D converter of the detection unit control unit 501. The drain terminal of the switching element 505 is connected to the current amplifier 506 and the current detection resistor 507. Hereinafter, the circuit including the current amplifier 506 that detects a current is referred to as a current detection circuit.

  One end of the first resistor 503 is connected to the power source 508 in parallel with the heater 205, and the other end of the first resistor 503 is connected to the second resistor 502 whose one end is grounded. The voltage value V divided by the first resistor 503 and the second resistor 502 is input from the input terminal of the second A / D converter of the detection unit controller 501. Hereinafter, a circuit that detects the voltage applied to the heater 205 is referred to as a voltage detection circuit.

The heater resistance value detection unit 402 calculates the current value I acquired by the first A / D converter and the voltage value V acquired by the second A / D converter, which is the voltage applied to the heater 205, from the following equation (1). The resistance value R is calculated.
R = V / I (1)

  FIG. 6 is a flowchart showing the cutting operation of the film 210 by the control unit 401. As shown in FIG. 6, in step 601, the control unit 401 drives the driving unit D1 to displace the second actuator 204, the pressure bonding unit 206, and the driven cutting roller 208.

  In step 602, the control unit 401 determines whether the temperature of the heater 205 is higher than the threshold value. When it is determined that the temperature of the heater 205 is higher than the threshold value (Y in step 602), the control unit 401 proceeds to step 603, and when it is not determined to be higher than the threshold value (N in step 602), the control unit 401 proceeds to step 604.

  In step 603, the control unit 401 performs the cooling operation of the heater 205.

  In step 604, the control unit 401 performs the heating operation of the heater 205.

  In step 605, the control unit 401 determines whether a predetermined time has elapsed from the start of the heater cooling operation or the heater heating operation. When the control unit 401 determines that the predetermined time has elapsed (Y in step 605), the control unit 401 proceeds to step 606, and when it determines that the predetermined time has not elapsed (N in step 605), the control unit 401 returns to step 602. The operation from step 602 to step 605 is an operation for keeping the temperature of the heater 205 at a threshold value for a predetermined time.

  In step 606, the control unit 401 performs the heater cooling operation.

  In step 607, the control unit 401 calculates the temperature of the heater 205 and determines whether the temperature of the heater 205 has cooled to the temperature at which the resin of the film 210 solidifies. When the control unit 401 determines that the heater 205 has cooled to the temperature at which the resin of the film 210 solidifies (Y in step 607), the control unit 401 proceeds to step 608, and the heater 205 has cooled to the temperature at which the resin of the film 210 solidifies. If it is determined that there is not (N in step 607), the process returns to step 606.

  In step 608, the control unit 401 drives the roller motor M2 to pull out the film 210 in the pulling direction. This is because the film 210 is cut by the heating operation of the heater 205, but the resin melted during heating is coagulated in the heater 205 and the film 210 can be naturally dropped even if the film 210 adheres to the heater 205. In order to do so, the film 210 is peeled off from the heater 205.

  In step 609, the control unit 401 drives the driving unit D1 to displace the second actuator 204, the pressure bonding unit 206, and the driven cutting roller 208 so as to return to the initial position.

  FIG. 7 is a state transition diagram showing a state of the heater 205 of the toilet device 1. As shown in FIG. 7, the state of the heater 205 includes a power OFF state 710, a cooling mode 720, and a heating mode 730.

  When the power is turned on in the power OFF state 710, the heater 250 of the toilet device 1 transits to the offset current measurement 721 in the cooling mode 720. In the offset current measurement 721, the offset error of the current of the current amplifier 506 is detected.

  The heater 250 alternates between the voltage / current measurement 722 and the offset current measurement 721 based on the signal output by the interval timer every predetermined time. In the voltage / current measurement 722, the toilet device 1 causes the control unit 401 to measure the voltage and the current of the heater 205 at substantially the same time with one interval timer. Here, in order to measure the voltage value and the current value, a current must be passed through the heater 205. Therefore, the control unit 401 conducts the measurement by passing an electric current through the heater 205 for a minute time that does not hinder the cooling.

  When the heater 205 enters the heater overheating step (step 604 in FIG. 6) due to the request for heating, the heater 205 transitions to the heating mode 730 and turns on the heater 205. In the heating mode 730, the control unit 401 repeats the heater voltage measurement 731 and the heater current measurement 732 based on the signal output by the interval timer every predetermined time. Then, when a cooling request is generated and the heater cooling step (step 603 and step 606 of FIG. 6) is entered, the control unit 401 turns off the heater 205 and shifts to the cooling mode 720.

  FIG. 8 is a timing chart showing an output signal of the interval timer and sampling timing for voltage / current measurement in the heating mode 730. As shown in FIG. 8, the interval timer outputs a signal every predetermined time T1, for example, every 5 ms. The heater 205 remains ON for heating, and the control unit 401 samples the voltage / current measurement based on the output signal of the interval timer.

  FIG. 9 is a timing chart showing the output signal of the interval timer and the sampling timing of voltage / current measurement in the cooling mode 720. As shown in FIG. 9, the interval timer outputs a signal every predetermined time T1, for example, every 5 ms. The control unit 401 alternately repeats the heater current / voltage measurement operation and the offset current measurement operation each time the interval timer signal is output.

  In the heater current / voltage measurement operation, the heater 205 is turned off for cooling, but in order to measure the voltage and current, the heater is turned on and the current is passed for a time that does not hinder cooling. Then, the control unit 401 measures the current value and voltage value of the heater 205.

  In the offset current measurement operation, the control unit 401 measures the offset current with the heater 205 kept off. Here, the current value I detected by the heater resistance value detection unit 402 includes an offset error of the current amplifier 506. Therefore, it is necessary to subtract this offset error from the current value I. Therefore, the offset current value is measured in advance by sampling the current value in the current OFF state.

  FIG. 10 is an explanatory view schematically showing the heater current / voltage measurement operation in FIG. 9 in an enlarged manner. As shown in FIG. 10, the control unit 401 turns on the heater 205 for a time T2 that does not hinder cooling, for example, 20 μs, based on the output signal of the interval timer, and passes a current.

  Further, the control unit 401 measures the voltage value V and then the current value I after a stable period, which is a predetermined time interval, has elapsed. Here, for example, a voltage value V lower than the voltage drop value ΔV due to the current from 12 V to the heater 205 is detected.

The control unit 401 calculates the current difference ΔI by the following equation (2).
Current difference ΔI = I- (offset current value) (2)
Here, the offset current value is an offset current value measured by sampling the current value in the current OFF state in advance.

  The control unit 401 calculates the resistance value R by substituting ΔI into I of the equation (1) and the voltage value V into V of the equation (1).

Next, the control unit 401 calculates the temperature T of the heater 205 based on the resistance value R by the following equation (3).
T = (R−R ₀ ) / (α · R ₀ ) ... (3)
Here, R0 is the resistance value of the heater 205 at 0 ° C., and α is the temperature coefficient of the heating element material of the heater 205.

  As described above, the toilet device 1 of the present invention includes the toilet seat portion 12, the film feed roller 201 that sends out the tubular film 210 formed of the thermoplastic resin, the narrowing portion that narrows the film 210, and the film 210. A heater 205 for heating, a pressure-bonding portion 206 for pressing the film 210 to the heater 205, a cutting roller 207 arranged below the heater 205 for pulling the film 210 downward, and a heater resistance value for detecting a resistance value R of the heater 205. A detection unit 402 and a control unit 401 that controls the heater 205 based on the resistance value R detected by the heater resistance value detection unit 402 are provided.

  Therefore, according to the present invention, there is an effect that it is possible to provide a film sealing device which surely seals a film without using a temperature detector such as a thermocouple and which has a low manufacturing cost.

1 Toilet device 2 Sealing device 11 Main body part 12 Toilet seat part 13 Opening part 14 Instruction controller 201 Film feed roller 202 Driven feed roller 203 First actuator 204 Second actuator 205 Heater 206 Crimping part 207 Cutting roller 208 Driven cutting roller 210 Film 401 control Unit 402 Heater resistance detection unit 411 Film feed switch 412 Cut switch 501 Detection unit control unit 502 Second resistor 503 First resistor 505 Switching element 506 Current amplifier 507 Current detection resistor 508 Power supply

Claims (8)

Toilet seat part,
A film feed roller which is arranged below the toilet seat portion and which sends out a tubular film formed of a thermoplastic resin,
A heater for heating the film,
A crimping portion for pressing the film to the heater,
A heater resistance value detection unit that includes a current detection circuit including a current amplifier that detects and amplifies a current flowing through the heater, and a voltage detection circuit that detects a voltage applied to the heater, and detects a resistance value of the heater. ,
Based on the resistance value detected by the heater resistance value detection unit sampling the current amplified by the current amplifier and the voltage applied to the heater, and subtracting the offset current value of the current amplifier from the sampled current. And a control unit for controlling the heater,
Toilet device equipped with.   The toilet device according to claim 1, further comprising: a narrowing portion that narrows down the film between the film feed roller and the heater.   The toilet device according to claim 1 or 2, further comprising a cutting roller that is arranged below the heater and that pulls in a drawing direction of the film. The control unit is
When the heater is cooling, the offset current value is sampled while the heater is off, and the heater is turned on for a predetermined time, and the current value amplified by the current amplifier and the voltage value applied to the heater. Is sampled,
The toilet device according to claim 1 , wherein when the heater is heating, the current value amplified by the current amplifier and the voltage value applied to the heater are sampled. The control unit is
The toilet device according to claim 4 , wherein the temperature of the heater is calculated from the resistance value, and the heater is controlled based on the temperature and a threshold value. A heater that heats the thermoplastic film,
A crimping portion for pressing the film to the heater,
A heater resistance value detection unit that detects a resistance value of the heater , including a current detection circuit including a current amplifier that detects and amplifies a current flowing through the heater, and a voltage detection circuit that detects a voltage applied to the heater. ,
The heater resistance value detector samples the current value amplified by the current amplifier and the voltage value applied to the heater, and subtracts the offset current value of the current amplifier from the sampled current value and the voltage value. a control unit for controlling the heater based on the resistance value detected Te,
A film sealing device. The film sealing device according to claim 6 , further comprising a cutting roller that is disposed below the heater and that pulls the film in a drawing direction of the film. The control unit is
When the heater is cooling, the offset current value is sampled while the heater is off, and the heater is turned on for a predetermined time to apply the current value amplified by the current amplifier to the heater. Sampling the voltage value,
The film sealing device according to claim 7 , wherein when the heater is heating, the current value amplified by the current amplifier and the voltage value applied to the heater are sampled.

Images