JPS6133935Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water supply control device for discharging gargling water discharged by a patient into a sewer in a dental unit.

The dental unit is equipped with a pot for patients to gargle with and its receptacle, a spittoon for receiving waste water discharged by patients, and a bee water supply means for supplying clean water to the bee for cleaning. In such a dental unit, bee water supply means include:
Continuous water supply from the start to the end of treatment poses various problems, such as wasting water, so the operator has decided to operate a drinking water tank installed near Hachi each time. In this case, water must be supplied frequently by the gargler or his/her assistant, and the water supply must be stopped with a certain delay after gargling, and it is necessary to wait until the filth has completely washed away, resulting in operational effort and time. causing unreasonableness.

An improved conventional device is an automated device that starts bee water supply when it detects when a patient lifts a gargling tip, and then stops bee water supply after a certain period of time when the patient lifts a gargle tip. There is. This conventional device detects when the gargling tip is taken up or returned from the saucer by installing a pair of poles around the tip installation position, and attaching a light-receiving element and a light-emitting element to these poles facing each other on the axis between which the tip is located. It depends on the optical sensor type detector provided.
Other types of tip detectors include those that use a mechanical or proximity switch installed on the patient's gargling motion, such as the backboard of a treatment chair or a cradle, or those that detect changes in the weight of the tip using a micro switch installed on the receiver. It will be done.

However, since the conventional optical sensor type detector has a pole around the tip, it is troublesome to pick up and return the tip. Furthermore, those using a mechanical type, a proximity switch, or even a micro switch have a complicated structure and require significant modification of the dental unit itself.

The purpose of the present invention is to provide a control device that can rationally detect whether or not water can be supplied, almost eliminates the need for modifying the dental unit, and provides appropriate water supply control when attempting to automate bee water supply.

This invention focuses on the fact that most gargling tips are made of metal, and detects the patient's gargling posture by using the tip as an electrode and detecting the change in impedance to the ground when the patient touches the filled tip. to control bee water supply.

The figure is a circuit diagram showing an embodiment of the present invention. The electrode 1 consists of a metal tip itself or a metal saucer of the tip insulated from other parts by an insulating material A as shown in FIG. Sense-up 2, which has electrode 1 as an input circuit, includes P-channel and N-channel MOSFETs and their input protection diodes D ₁ ,
It includes D ₂ and input level adjustment resistors R ₁ and R ₂ , and when a person touches electrode 1, that is, when a person touches the gargling tip, the P channel MOSFET becomes conductive, charging C ₂ and outputting a high level. obtain. Conversely, when the tip is lifted from the saucer or no one is touching the tip, the P-channel MOSFET becomes non-conductive and stops charging C ₂ , while the N-channel MOSFET becomes conductive, and the charge on C ₂ becomes R'. ₃ and the output becomes low level.

The high level output of the sense up 2 is used as a set input to set the flip-flop 4 unless the reset NOR gate 3 has a reset output (low level). Therefore, when the patient touches the tip, the flip-flop 4 enters the set state and memorizes it, and even if the patient picks up the tip from the saucer and the output of the sense up 2 returns to the low level, the flip-flop 4 stores the gargling position. Ru.

The set output of the flip-flop 4 drives a relay driver 6 through a two-stage CMOS inverter buffer circuit 5, and the relay 6 of the relay driver 6 is
energize A. The relay 6A opens the bee water supply valve 7 by its operation, and starts supplying water to the bees. On the other hand, the set output of the flip-flop 4 is input to an integrating circuit 8 which has a resistor _R3 and a capacitor _C1 as integrating elements, and the integrating circuit 8 performs an integrating operation by opening the discharge circuit of the capacitor _C1 by the operation of the relay 6A. Start. The integrator circuit 8 provides a logic "1" input to the NOR gate 3 after a time corresponding to its time constant, and the flip-flop 4 is reset by the output of the NOR gate 3. Therefore, only when the patient touches the tip, the flip-flop 4 is set and bee water supply is started, and from that point on, a timer operation is started to stop the bee water supply after a delay of the time constant of the integrating circuit 8. This timer period is set to be longer than the time required for the patient to start and finish gargling, preferably longer than the time required to complete the bee wash.

The bee water supply is stopped not only by the output of the integral circuit 8, but also by resetting the flip-flop 4 by the relay 11, which is energized in parallel with the opening of the water supply valve 10 by turning on the automatic switch 9 for automatic water supply. This is done by resetting the flip-flop 4 using a single pulse signal in the Schmitt trigger circuit 13 for detecting power supply start-up when the power supply 12 is started up to start the control. Among these, the reset of the flip-flop 4 by the relay 11 is a cancel circuit operation in which the patient's gargling motion is detected only by contact with a full water tip, and contact with an empty tip is not determined as a gargling motion. That is, the auto run automatic switch 9 detects that an empty pot is placed on the saucer based on the weight of the pot, and upon this detection, the circuit is closed and the pot water supply valve 10 is operated to supply a certain amount of water to the empty pot. The circuit detects from the weight that it has been supplied. Along with this opening/closing operation of the automatic filler switch 9, the automatic filler switch 9 is closed from when an empty pot is placed on the saucer until a certain amount of water has been poured, and during this time the relay 11 is closed. is energized and flip-flop 4 passes through Noah gate 3.
has been forcibly reset. Therefore, even if the patient touches the tip during automatic water supply using the tip water supply valve 10, the flip-flop 4 is not set due to the cancel circuit operation caused by the energization of the relay 11, and as a result, the tip is filled with water. The start of bee water supply is controlled only by contact.

As described above, according to the present invention, the patient's gargling motion is detected by contact with the water-filled tip (touching the empty tip activates the cancel circuit and the bee water supply is not performed), and the bee water supply is performed. Start control is performed, and bee water supply stop control is set after a certain period of time by a timer regardless of whether the tip is taken up or returned, so there is no need for complicated detection means such as poles around the tip as seen in conventional gargling motion detection. This is a simple detection means that requires almost no modification, as it is only necessary to pull out the lead wire from the saucer or the like to the control device side, and enables water supply that is compatible with the patient's gargling motion. With the optical sensor type, water continues to flow to the bee when the bee is taken away because it disappears, and it cannot be determined that it is a gargling operation, but with this invention, the water supply is always stopped after a certain period of time.
In addition, since the water supply is automatically stopped by a timer, the water supply will be automatically stopped except for manual water supply, and after the end of the day's treatment, the main switch MS of the power supply circuit 12 will be turned off.
Even if you forget to turn off the water supply, the water supply will not be left unused. In addition, most of the configuration is constructed using digital elements, so that almost no adjustment is required and control operations can be performed reliably.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a schematic diagram of a variant of the electrode. DESCRIPTION OF SYMBOLS 1... Electrode, 2... Sensor, 4... Flip-flop, 6... Relay circuit, 7... Bee water supply valve, 8... Integral circuit, 9... Auto run automatic switch, 10... Copper water supply valve, 11 ……relay.

Claims (1)

[Scope of utility model registration request] In a dental unit that has a pot for patients to gargle with and its saucer, a bee that receives waste water discharged by the patient, and a water supply source that supplies clean water to wash the bee, the tip is made of metal. and is equipped with a sensor that detects a person's contact with the water-filled tip as a change in ground impedance, using the saucer electrically insulated from the tip itself or other parts on which the tip is placed as an electrode, A water supply control device for a dental unit, comprising a control circuit that starts water supply control to the bees based on the detection output of the sensor, and controls the water supply to be stopped after a certain period of time from the start of the water supply.