CN87200914U - Self-controlling bell clock - Google Patents

Abstract

The utility model relates to a self-controlling bell clock which is mainly used for class begun bell ringing and class over bell ringing in schools. After the control electrode and main electrode of a bidirectional controlled silicon receiving voltage, the bidirectional controlled silicon is triggered to conduct. A music door bell after being triggered can put out music signal voltage. The music signal voltage is used as the triggering voltage of the bidirectional controlled silicon to trigger the bidirectional controlled silicon to conduct, and then an electric bell rings. When the music signal stops, the bidirectional controlled silicon is shut off, and then the electric bell stops from ringing. The electric bell can keep ringing as long as the music signal is kept. A resistor in the loop circuit of the control electrode of the bidirectional controlled silicon is regulated, and the bidirectional controlled silicon can put out pulse direct current to enlarge the sound intensity of the electric bell ringing.

Description

Self-controlling bell clock

The utility model is the automatic control clock of ringing a bell.

The device of ringing a bell of the automatic control of using at present mainly contains two kinds: a kind of large scale integrated circuit that is to use, its advantage are the precision height, but complex circuit, price height are difficult for popularizing.Another kind is a clock controlled, the hour hands that move and minute hand moving plate as switch, duty with pilot relay, this device is cheap, but sheet metal and programmed control plate contact will flow through tens milliamperes electric current, the easy oxidation in contact, and lean on the sheet metal that constantly moves to contact easy switch-on and-off with control panel, so the tinkle of bells often has desultory phenomenon to take place.

The purpose of this utility model just provides a kind of automatic ringing device, free of discontinuities phenomenon when making the electric bell sounding, and sounding can freely be adjusted continuous time, and control accuracy meets the requirements.When having a power failure, can remind the people to ring the bell.

The utility model essence is the combination utilization with music doorbell circuit and bidirectional triode thyristor.We know that music door-bell triggers once, and loudspeaker are just played music once, if we are added to this music signal voltage the control utmost point and the central electrode T of bidirectional triode thyristor ₁Between, controllable silicon is with regard to conducting, the electric bell sounding.Music signal generally continues tens seconds again, so before music signal disappeared, the tinkle of bells can be successively, music signal disappears, and bidirectional triode thyristor has the zero passage blocking effect to alternating current, and the tinkle of bells also stops, regulate the perdurability of music signal, the tinkle of bells also changes perdurability.During power failure, ring a bell constantly to predetermined, music signal takes place equally, plays the effect of reminding the people to ring the bell.In Fig. 1,1,2 is music IC trigger end, and 1 connects power supply "+" utmost point, 3 connects NPN transistor base stage, 4 and connect collector, 5 and connect power supply "-" utmost point, and 7,8 connect the oscillation resistance two ends.

In order to say clearly the method that triggers music circuit, introduce the principle of work of program board earlier, diel 24 hours, the hour hands of clock are just walked two circles, so the angle α (0 °≤α＜720 °) that arbitrary moment is total and hour hands turn in 24 hours sets up relation one to one, if we do two circle Copper Foils with printed board, make them every 12 hours, in turn conducting by each is once done several rectangle copper foils near the Copper Foil circle, when the sheet metal of going up welding when hour hands (material is a metal) turns to Copper Foil a, because a links to each other with the Copper Foil circle with conductor (with "-" expression), so music circuit trigger end 1,2 short circuits, music circuit is triggered, the electric bell sounding.If when sheet metal turned to b on the hour hands, because b and Copper Foil circle are obstructed, music circuit was triggered, electric bell noiseless (Fig. 2).In order to improve precision, make the appearance of Fig. 3 into, make that sheet metal also becomes a switch on the minute hand, and be connected in the circuit, when the sheet metal on hour hands and the minute hand all passed through rectangle copper foil and corresponding Copper Foil circle connection, music circuit just can be triggered, and this has just improved precision.

Program board (Fig. 4, only drawn central angle and be 30 ° part) be a printed circuit board, be close on the panel of clock, have 6 circle Copper Foils on the control panel, number is first, second from outside to inside ... the 6th circle Copper Foil, wherein 1,3,4 circles constitute the sequence circuit that triggers music circuit with related elements, and the 2nd, 5 circles constitute from console keyboard preparation bell sequence circuit with related elements.3rd, 4 circle Copper Foils every 12 hours in turn conducting by each once, the 5th circle Copper Foil every conducting in 12 hours or once by each, this task is that the hour hands tail end is stirred a gear and finished, its effect is the same with the hand-screw waver.The switch of the utility model design is identical with the waver function.In Fig. 3, though a sheet metal joins with C on the hour hands, C is connected with conductor with the Copper Foil circle, and corresponding Copper Foil circle is a cut-off state, so music circuit still fails to trigger.

The utility model is compared with existing automatic controlled alarm device, following characteristics are arranged: 1, do not have interrupted phenomenon during continuous ringing, after tens seconds, i.e. outage is automatically turn-offed after having avoided the interrupted sounding phenomenon of use relay or having adopted first self-locking and is brought difficulty for the production process control panel.2, jingle bell has music signal output simultaneously, and the effect of reminding on class and ringing a bell (when not having electricity) is arranged.When 3, music circuit triggers, flow through the sheet metal contact current and be generally less than several milliamperes, the contact is difficult for oxidation, can use for a long time, and the triggered time is extremely short, if the sheet metal on the minute hand and Copper Foil duration of contact are 10 seconds, in 10 seconds, connect circuit as long as there is 1/100 second, music circuit is just triggered sounding, so crash rate is extremely low.

Further improvement of the utility model is variable resistor of serial connection in the control utmost point loop of bidirectional triode thyristor, adjusts resistance sizes, makes the bidirectional triode thyristor control utmost point and central electrode T ₁Between voltage change, make a controllable silicon output ripple direct current, thereby improve the electric bell sound intensity greatly, use than low country at voltage, the sound intensity that electric bell sends can be greater than or equal to the voltage sound intensity that just often electric bell sent.

The sequence circuit fundamental diagram that Fig. 5 rings a bell for automatic control, K ₁, K ₂The switch that is driven for hour hands tail end handsetting gear.Wherein 1,3,4 circle Copper Foils (counting from outside to inside) constitute the sequence circuit that triggers music circuit with related elements, and elements such as the 2nd, 5 circle Copper Foils and relay constitute the sequence circuit of playing the preparation bell.

In Fig. 5, in the frame of broken lines in circuit and Fig. 1 frame of broken lines circuit identical, arrow is 1., 2. be connected with music IC1,2 ends respectively.

Claims (1)

1. Automatic controlled alarm device: the control utmost point of a bidirectional triode thyristor and main motor T ₁Between add that voltage just can make the bidirectional triode thyristor conducting.Its technical characterictic is the control utmost point and the central electrode T that the output signal voltage of music circuit is added to bidirectional triode thyristor ₁On, and at the control utmost point and central electrode T ₁Between variable resistor of series connection, adjust variable resistor R, change and be added in the bidirectional triode thyristor control utmost point and central electrode T ₁Between the size of voltage, make bidirectional triode thyristor output ripple direct current, improve the electric bell sound intensity.Music signal disappears, and bidirectional triode thyristor ends, and electric bell stops sounding.

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