US1620359A - Motor-control system - Google Patents

Description

March 8, 1927 1,620,359

E. E. KLEINSCHMIDT amen {CONTROL SYSTEM Filed m 1925 I mvsmoR ATTORNEY Patented Mar. 8, 1927.

UNITED STATES PATENT OFFICE.

EDWARD E. KLEINSCHMIDT, OF LONG ISLAND CITY, NEW YORK, ASSIGNOB TO MOB- KRUM-KLEINSCHMIDT CORPORATION, OF CHICAGO. ILLINOIS, -A CORPORATION OF DELAWARE.

MOTOR-CONTROL SYSTEM.

Application filed May '21,

This invention relates to a system and apparatus for controlling motors at remote points.

More particularly, it relates to a system of starting and stopping motors at distant points, in a manner especially useful in printiiig telegraph systems of the light traffic type, although it will be understood-that the invention is not limited to printing telegraph systems.

In systems where the demands on d1stant motors are-not continuous, it is desirable to operate the motors only when the working of the system requires such operation. This is especially desirable in light traffic printing telegraph systems and the preferred embodlment of the present invention will herein be disclosed in connection with such a system.

The objects of the invention are to provide a simple and reliable control system for distant motors; to provide a control system in, which commencement of operation of the system at any point will start the motors into operation; to provide an arrangement in which the control apparatus may be more or less centralized at a convenient point but 0 erable from any point, and such other 0 jects as may be attained in the preferred embodiments herein disclosed and shown in the drawings of which,

Figure 1 is a diagrammatic representation of the invention as applied to a printing telegraph system, using current and no-current signals. I

Figure 2 is a diagrammatic representation of the invention as applied to a telegraph system in which signalling currents of reversed polarities are used.

Figures 3 and 4 show modified forms of control arrangements.

Figure 5 is a fragmental view of a selec tively controlled contact arrangement.

Referring to Figure 1, 1 represents the printer receiving magnets, 2 are the transmitter contacts, 3 are the motor control magnets, at are printer operating motors and may also operate the transmitters, 5 are motor stop keys, 6 are motor start keys which are arranged to short circuit high resistances 7, and 8 are the usual line batteries. It will of course be understood that any well known preventing their operation.

1923. Serial No. 640,630.

ical single magnet printers of well known construction, or they may control rotary distributors and multiple magnet printers. It will also be understood that transmitting contacts-2 may be tape or key controlled asis well known in the art. Only so much of the well known apparatus has been indicated as is necessary to illustrate the manner of applying the present invention thereto.

It will be noted that when the apparatusv is at rest as shown, the line is closed through magnets 3, resistances 7, keys 5, batteries 8 and to ground, permitting a relatively weak current to flow over. the line. This current is sufliciently strong to hold armatures 9 of magnets 3 in attracted position, thus opening the energizing circuits of motors 4, and With keys 6 openand resistances 7 in the circuit the line current is insufiicient in strength to cause magnets 3 to pick up their armatures 9'and open the motor circuits after the armatures have been released.

With the system at rest as shown, oommencement of transmission to any station on the line by operation of any transmitting contact 2, or operation of any start contact 5 will cause all the magnets 3 to de-energize, permitting armatures 9 to drop back and close all the local circuits through motors 4, all receiver motors will then be started into operation simultaneously with the commencement, of transmission or opening of the line circuit. As above pointed out, the ordinary signalling currents are insuflicient in strength to cause pulling up of armatures 9. With the motors in operation, in case it is desired by any station to stop operation of the motors, any stop key 6 is depressed to shunt a resistance 7 out of the line circuit.

cuits of motors 4 are opened.

In the modification shown in Figure 2, the invention is applied to'a system using reversed polarity current signals. vIn this form 21 represents the receiving magnets or line relays, 22 represents the transmitting contact, 23 are'the motor control magnets, 24 are the motors, 25 are the start keys, 26 is a selectively controlled stop switch, 28 is the line battery, and 29 are the motor control armatures of magnets 23. Battery 28 is arranged to apply to the line relatively Weak potentials of opposite polarltles for marking and spacing signals, and a relatively strong potential ofthe same polarity as the spacing impulses of the signals, for control purposes. Transmitter contact 22 normally rests on the weak spacing potential battery contact, and is moved to the marking contact to cause signaling. The spacing current normally on the line is suflicient to cause armatures 29 to be held up but is insufiicient to pick up armatures 29 after they have been released. As in the first form, opening of the line by commencement of transmission or by the opening of any start key 25 will cause armatures 29 to fall back up armatures .29 and open the circuits ofmotors 24. The details of the receiver or selector mechanism for operating pull bar 52-are well known in the art and is no part ofthe present invention. For a full disclosure thereof reference may be had to the signal bell operating actuating bar mechanism disclosed in copending application Serial'Number 390,598, filed June 21, 1920. It will,however, be clear that any code signal, or printer actuating bar in upper or lower may be used to operate-member 26. Pull bar 51 returns to, the position shown in Figure 2, placing the relatively weak spacing potential on the line, until it is desired to again start operation of the apparatus.

Figure 3 shows a modification in which control on a system using line currents of one polarity only is effected by operation of a special actuating bar as in Figure 2. When it is desired to stop the motors, a special signal is sent to the line to operate an actuating bar 51 (Figure 5) which as above described, operates contact 36 to send a current of increased strength to the line from lire battery 38. causing the motor control magnets to pick up as described in Figure 1. To-apply this form in the system of Figure 1 batteries 8, resistances 7 and keys 6 are discarded, and 38 with its control contacts are placed in the line in obvious manner.

Figure 4: shows a modified form of sto control for Figure 1 in which resistances and keys 6 are discarded, and a single resistance 47 are adapted to be short circuited by an actuating bar controlled set of contacts 46 is substituted in series with the line in place thereof. To stop operation of the motors, a special signal operates a special actuating bar 51 (Figure 5), as above described, to short circuit 47 and permit an increased line current to flow, thereby causing magnets 3 to pick up armatures 9and stop the motors. The remainder of the operation is the same as for the system of Figure 1.

It will be obvious to those skilled in the art that the invention is not limited to the embodiments herein described, and that many changes may be made without departing from the spirit of the present description thereof.

Having described preferred embodiments of the invention, what is desired to be secured by Letters Patent and is claimed as new is:

1. A printing telegraph system comprising transmitting apparatus, receiving apparatus controlled by said transmitting apparatus, a motor for said receiving apparatus, a marginal relay controlling said motor andcontrolled by said transmitter, and control means for said relay.

2. The combination as set forthin claim 1 in which the control. means for said relay embodies a contact controlling member adapted to vary the amount of current flow- "ing through said marginal relay.

3. In a system comprising a remote control circuit, a motor and control means for said motor controlled over said circuit, the method of operation which consists in starting said motor into operation in response to a single circuit condition, and stopping said motor in response to a fixed combination of differing circuit conditions. V

4. The method as set forth in claim 3 in which the starting condition is an'open circuit condition.

5. The method as set forth in claim 3 in which the stop combination comprises a code combination of closed and open circuit conditions'.

6. A telegraph system comprising a plurality of transmitters; a plurality of receivers; a plurality of operating motors for said receivers; supply circuits for said motors; and starting means embodying marginal relays individual to said motors controlling said supply circuits.

7. A telegraph system comprising a plurality of transmitters; a plurality of receivers; a plurality of operating motors for said receivers; supply circuits for saidmotors; starting means embodying marginal relays individual to said motors operating said supply circuits; and control contacts independent of'said transmitters for controlling said marginal relays.

8. A printing telegraph system compris- I lectively responsive to said code combina- 9. The combination as set forth in claim tions of impulses; a motor for said receiver; 8 in which said last mentioned means commeans to start said motor in operation in re prises a motor circuit control contact and 1 sponse to the initial operation of said transoperating means therefor.

5 mitting means and to stop the operation of Signed at Long Island City, N. Y., this said motor in response to a special code com- 14th day of May, 1923. bination of electrical conditions. EDWARD E. KLEINSCHMIDT.

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