CN2249471Y - Fully automatic switch device for facsimile apparatus - Google Patents

Abstract

The utility model relates to a fully automatic switch device for a fax machine, composed of a starting circuit for ringing signal detection, a switching circuit for communication signals, a monitoring circuit for communication signals and a power section, wherein, a pulse monostable circuit is connected with an output end of the other R-S trigger bi-stable circuit to form a higher level circuit which is connected in series with a third pulse time-delay start circuit via a switch triode; an output end of the higher level circuit controls a relay J1. An output end of the third pulse time-delay start circuit controls the other relay J2. Contacts of the J1 and the J2 are used for respectively controlling the on-off of a terminal electric source via communication lines. The device supports large-capacity communication, and has small power consumption and easy use.

Description

Facsimile machine full-automatic switch device

The utility model relates to fax communication and data communication field, particularly facsimile machine full-automatic switching control device.

At present, traditional facsimile machine or other terminal (as: computer) of carrying out communication by telephone wire generally can only the booting wait input signals, the ratio of its booting wait time and transmitting-receiving time is by starting shooting weekly 168 hours, receive and dispatch every day and be calculated as 52: 1 in 1 hour, therefore, be unfavorable for saving the energy, prolong terminal useful life.

The purpose of this utility model is to provide a kind of facsimile machine full-automatic switch device of energy-conservation, economic, convenient, dependable performance.

The utility model is made up of bell signal detection start-up circuit, communication signal commutation circuit, communication signal observation circuit and power unit.The bell signal detection start-up circuit comprises: two signal input parts that link to each other with the outside line positive and negative electrode, triode V ₁, 555 time-base circuit IC ₁And relay J ₁The communication signal commutation circuit is by 555 time-base circuit IC ₂, triode V ₂And relay J ₂Form; Above-mentioned two signal input parts pass through capacitor C respectively ₂, diode D ₁Serial connection branch road and capacitor C ₈With triode V ₁Base stage is connected, diode D ₃Positive pole connect capacitor C ₈Signal end, diode D ₃Negative pole meet above-mentioned diode D ₁With capacitor C ₂Link; The communication signal observation circuit is by 555 time-base circuit IC ₃, voltage sampling resistor R ₃, R ₄Form; Above-mentioned IC ₁Control end by current-limiting resistance R ₅With above-mentioned D ₁, C ₈Link link to each other IC ₁Be pulse enable monostable trigger-action circuit, IC ₃Be R-S trigger flip-flop circuit, IC ₁With IC ₃Output butt joint, as higher level's circuit, by switch triode V ₂Main pulse delayed startup IC circuit during with the 3rd ₂Series connection, the delay circuit IC of subordinate ₂Than higher level IC circuit ₁, IC ₃Postpone the several seconds upset; J ₁Be connected on IC ₁Between output and the power cathode, J ₂Be connected on IC ₂Between output and the power cathode, J ₁Be double-contact relay, its normally opened contact is serially connected in the ac power supply circuit, and normally-closed contact is serially connected in outside line and the terminal line; J ₂Be the single contact relay, its normally opened contact and above-mentioned J ₁The normally-closed contact parallel connection; When higher level's circuit upset output high level, adhesive double-contact relay J ₁, normally opened contact is connected the terminal power supply, and normally-closed contact cuts off the signal line of terminal; Another relay J in the signal line ₂Normally opened contact closure when the delayed startup circuit overturns, lead to the communication signal IC of terminal ₃Input be connected on voltage sampling resistor R ₃, R ₄Link, R ₃, R ₄Series connection is between the outside line positive and negative electrode.

The utility model can make facsimile machine or wait at off-mode by the computer that telephone line carries out communication, after signal is imported several seconds, can import the transmitting-receiving operating state.All communication process makes communicating terminal return the shutdown wait state after finishing.Have performance sensitive, support big capacity communication, little, the easy to use characteristics of the signal power consumption of keeping in communication.

The drawing explanation:

Accompanying drawing is a circuit diagram of the present utility model

Operation principle of the present utility model is as follows: bell signal is by C ₂, C ₈, D ₁, D ₃The ring detecting circuit of forming is through current-limiting resistance R ₃, make V ₁Conducting is with IC ₁The trigger end current potential zero setting of the pulse enable type monostable trigger-action circuit that constitutes, IC ₁Upset, the output high potential makes relay J ₁Adhesive, J ₁Normally opened contact connect the terminal power supply; Just terminal transfers the booting wait state to by shutdown; IC ₁To continue to export high potential, upset is the output electronegative potential after 30 seconds.If have bell signal to overturn at once to the output high potential again on the circuit, export electronegative potential after 30 seconds again.Adjust IC ₁The peripheral timing resistor and the value of timing capacitor can reach the purpose of adjusting flip-flop transition.The effect of above circuit is to power to terminal after detecting the bell signal that circuit transmits.J ₁Normally-closed contact cut off the communication signal lead to terminal because IC ₁Upset is the V of conducting simultaneously also ₂, make IC ₂Delay circuit is exported high potential after three seconds, attracting electric relay J ₂, J ₂Normally opened contact connect communication signal to terminal.Terminal has been opened and has been in wait state three seconds this moment, detects bell signal and can begin communication, and above circuit function is the signal that keeps when the terminal energising starts in the circuit.IC ₃Constitute R-S and trigger flip-flop circuit, form a voltage comparator, by detecting R ₃, R ₄Between dividing potential drop communication line is monitored, in case terminal begin the transmitting-receiving, IC ₃Promptly export high potential, keep relay J incessantly ₁, J ₂Work, make the supply line of leading to terminal and signal line keep unimpeded.Communication finishes then IC ₃Output low level immediately, IC ₁Output low level discharges J in 30 seconds ₁With J ₂, cut off terminal supply line, return the shutdown wait state.Above circuit function is to satisfy the long arbitrarily needs of communication time.Send IC ₁With IC ₃When off-hook, overturn simultaneously, make J ₁Adhesive, IC after three seconds ₂Upset adhesive J ₂Can begin dialing, the same receiving course of circuit working principle.The circuit work power that comes device is by power input plug, AC transformer T, rectification full-bridge V ₁, filter capacitor C ₁Form.Terminal supply line comprises: K switch, fuse, J ₁Normally opened contact and out-put supply socket.D in foregoing circuit ₃, D ₄, D ₄Be the weakening buffer action, D ₂, D ₆Play the effect of elimination relay back electromotive force.R ₁, R ₃, R ₆, R ₇Be current-limiting resistance, play the effect of protection switch pipe, C ₅, C ₆, C ₉Be respectively IC ₁, IC ₂, IC ₃The voltage controling end ground capacity.This device can also act on the telephone line alarm and night night shift room mains lighting supply socket etc.

Claims (1)

1. A kind of facsimile machine full-automatic switch device is characterized in that: facsimile machine full-automatic switch device is made up of bell signal detection start-up circuit, communication signal commutation circuit, communication signal observation circuit and power unit; The bell signal detection start-up circuit comprises: two signal input parts that link to each other with the outside line positive and negative electrode, triode V ₁, 555 time-base circuit IC ₁And relay J ₁The communication signal commutation circuit is by 555 time-base circuit IC ₂, triode V ₂And relay J ₂Form; Above-mentioned two signal input parts pass through capacitor C respectively ₂, diode D ₁Serial connection branch road and capacitor C ₈With triode V ₁Base stage is connected, diode D ₃Positive pole connect capacitor C ₈Signal end, diode D ₃Negative pole meet above-mentioned diode D ₁With capacitor C ₂Link; The communication signal observation circuit is by 555 time-base circuit IC ₃, voltage sampling resistor R ₃, R ₄Form; Above-mentioned IC ₂Control end by current-limiting resistance R ₅With above-mentioned D ₁, C ₈Link link to each other IC ₁Be pulse enable monostable trigger-action circuit, IC ₃Be R-S trigger flip-flop circuit, IC ₁With IC ₃Output butt joint as higher level's circuit by switch triode V ₂Main pulse delayed startup IC circuit during with the 3rd ₂Series connection, the delay circuit IC of subordinate ₂Than higher level IC circuit ₁, IC ₃Postpone upset; J ₁Be connected on IC ₁Between output and the power cathode, J ₂Be connected on IC ₂Between output and the power cathode, J ₁Be double-contact relay, its normally opened contact is serially connected in the ac power supply circuit, and normally-closed contact is serially connected in outside line and the terminal line; J ₂Be the single contact relay, its normally opened contact and above-mentioned J ₁The normally-closed contact parallel connection; When higher level's circuit upset output high level, J ₁Work, subordinate's circuit delay upset makes the single contact relay J ₂Work; IC ₃Input be connected on voltage sampling resistor R ₃, R ₄Link, R ₃, R ₄Series connection is between the outside line positive and negative electrode.