DE1029407B - Circuit arrangement for controlling the readiness to send for two telegraph transmitters working on a common line - Google Patents

Description

GERMAN

The invention relates to telegraph transmitters that are controlled by punched tape or by a keyboard will. Such transmitters are driven by a motor. If the - transfer of Characters that have already started before the engine has reached its appropriate speed will be the first Distorted characters sent. This also occurs if the transmission of the characters is still continuing after the engine has already been switched off and the engine speed count starts to drop.

A transmitter controlled by a perforated strip is already known, which is driven by a motor via a friction clutch and a mechanical device that operates the clutch when the engine has reached its target speed. Not to mention the fact that this mechanism is complicated and difficult to manufacture becomes a time lag not absolutely determined in this way, since it only has a certain number of revolutions the motor shaft is dependent, which is not a criterion for whether the full speed is already reached has been.

In another known device, the transmitter contacts are kept short-circuited as long as until a release lever is released by the engine when it has reached its target speed. This The release lever sets the short circuit via the transmitter contacts once per revolution of the release period and when the push button "off" has been pressed to stop the motor. The release lever is held in a position in which it closes the short circuit via the transmitter contacts. In this way the transmission of Teletype characters prevented if the engine speed is too low.

The present invention relates to a circuit arrangement for controlling two to one common Management working telegraph transmitters, where · the The speed of the motor is monitored by means of centrifugal force actuated contacts and one mechanically or electromagnetically controlled clutch only becomes effective at the set engine speed. This circuit arrangement has the special feature over the known circuit arrangements that the second telegraph transmitter working on the same subscriber line only at the moment from the line is disconnected when the motor of the first telegraph transmitter has reached its target speed. This is done according to the invention in that when the target speed of the engine is reached, the first Telegraph transmitter's clutch magnet is switched on immediately via a relay. This is a Short-circuit loop for the transmission contacts of the second telegraph transmitter by closing '. Blelaiskon switching arrangement to control

readiness to send for two

working on a common line

Telegraph transmitter

Applicant:

Creed and Company Limited,
Croydon, Surrey (UK)

Representative: Dipl.-Ing. H. Ciaessen, patent attorney,
Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

Claimed priority:
Great Britain 26 January 1965

Frederick P. Mason and Ronald G. Stemp,
Croydon, Surrey (UK),
have been named as inventors

clock this relay and formed by contacts of a line switch. This becomes the second Telegraph transmitter immediately prevented from sending. When switching off the first transmitter manually via a motor switch, the relay drops out with a time delay and thereby separates the short-circuit loop for the Send contacts of the second transmitter with a time delay.

This circuit arrangement makes it possible for the two telegraph transmitters not to be mutually exclusive interfere with the transmission and the transmission of the second transmitter, known as the auxiliary transmitter, only then is interrupted when the first, i.e. H. the main broadcaster broadcasts the program without character mutilation can actually begin. The second sender will only continue to be released for the broadcast when the last character steps of a character from the first transmitter are transmitted unmutilated.

An embodiment of the invention is described with reference to the drawing.

This drawing shows the circuit arrangement for controlling the clutch solenoid. Two manually operated switches are provided, one is a motor switch MMS and the other is a line switch MLS. The MMS motor switch has two separate contacts 1 and Io and is normally in the open position. When the switch is actuated, contact 1 connects the power source P to the motor M.

80Θ 509/134

If the motor reaches its set speed, then the centrifugal force controlled contact 2 is opened and the induction current surge of the motor flows in an oscillating manner via the capacitance C. The oscillating voltage on the capacitor C is applied via the contact la of the switch MMS is placed on the full-wave rectifier bridge 4, 5, 6 and 7 and on the winding 8 of the relay R.

The relay R closes four contacts rl, r 2, r 3 and r4; rl bridges contact 1 of the MMS switch. The contact rZ connects a resistor 3 via the contact 2 and deflects part of the current that flows through the rectifier bridge and the winding 8 of the relay R. The resistor 3 is chosen so that sufficient current flows through the relay winding 8 so that the relay R remains attracted. The resistor 3 is intended to help reduce the induction current surge of the motor when the contact 2 is actuated.

Closing the contact r2 prepares the activation of the release magnet CRM of the clutch. The completion of the circuit of this magnet depends on the contacts 12 of the manual line switch MLS . If the start of a transmission of telex characters is desired, the switch MLS is actuated. The CRM clutch release magnet then receives power. The coupling between the motor and the transmitter (not shown) takes effect and teletype transmission begins. The winding 9 arranged on the right side of the relay R receives current from the circuit which actuated the clutch magnet via the rectifier 10 and thus keeps the relay R attracted. It should also be noted that the start of a transmission is only possible at the set speed of the motor, even if the two switches MMS and MLS are actuated at the same time, since the clutch magnet CRM is not actuated until the contact r2 is closed. This contact is only closed when the motor has reached its target speed.

A second contact, such as contact 12a, can be provided on switch MLS which forms a short circuit when contact r4 is closed. The lines α and b are connected to the transmission contact circuit of an auxiliary transmitter, which transmits via the same channel as the main transmitter. In this way, any interference in the main transmitter by the auxiliary transmitter is prevented.

Any accidental short-circuiting of the contacts of the auxiliary transmitter by operating the switch MLS without closing the motor switch is prevented by the arrangement of the contact r4 in the short-circuit kits.

If you now want the transmission to stop, the two switches MMS and MLS are opened. The holding winding of the relay R is then switched off via a rectifier 11 which is located above this winding. The relay R therefore slowly drops out with a time delay. This delay time allows the transmitter cam sleeve to complete its revolution at the existing speed. When relay R finally drops out, contacts rl, r2, rZ and r4 are opened and stop the machine. The presence of the rectifier 10 prevents the rectifier 11 from dropping the magnet CRM with a time delay.

If the transmitter is controlled by a punched tape, can be a contact 13, which opens when the tape is stretched too tight by the transmitter, in the Circuit of the clutch magnet are provided, which stops the transmitter and prevents the Paper tape tears.

Claims (7)

PATENT CLAIMS: 1. Circuit arrangement for controlling the readiness to send for two telegraphic transmitters working on a common line, in which the speed of the motor is monitored by means of centrifugal force actuated contacts and a mechanically or electromagnetically controlled clutch is only effective at the target speed of the motor, characterized in that when the Set speed of the motor (M) of a first telegraph transmitter, its clutch magnet (CRM) is switched on immediately via a relay (R) and that a short-circuit loop for the transmission contacts of a second telegraph transmitter, which works on the same line as the first, by closing the contacts ( r4) of the relay (R) and the contact (12o) of the line switch (MLS) and thereby the second transmitter is immediately prevented from sending, when the first telegraph transmitter is switched off via the motor switch (MMS), on the other hand, the relay (R) drops out with a time delay and the short-circuit loop for the send contacts of the second transmitter is disconnected with a time delay via contact (r4). 2. Control device according to claim 1, characterized by a clutch controlled by an electromagnet (CRM) which is actuated by the attraction of an electromagnetic relay (R) which responds via a circuit in which the winding (8) of the relay (R) and the contact (r3) of the relay (R) is, and that holds itself through this circuit. 3. Control device according to claim 1 or 2, characterized by the centrifugal force actuated contacts (2), which are open when the desired motor speed is reached. 4. Control device according to claim 3, characterized by the opening of the contacts (2) when the motor (M) has reached its desired speed and hereby an electromagnetic relay (R) is actuated, which causes the clutch (CRM) to drive the transmitter . 5. Control device according to claim 1 to 4, characterized by the contacts (2) actuated by the centrifugal force which actuate the relay (R) when they move out of the position they assume when the motor (M) is at a standstill. 6. Control device according to claim 1 to 5, characterized by the clutch (CRM) which is under the influence of a manually operated switch (MMS) . 7. The device according to claim 1 to 6, characterized by operating this switch (MMS) by hand to start the transmitter, at the same time preventing the transmission of a second transmitter that can send over the same telegraph channel. Considered publications:
German patent specifications No. 669 445, 877 914. 1 sheet of drawings © 8Ö9-5IB / 134 4.