US1721952A - Printing-telegraph system - Google Patents

Description

July 23, 1929. F. G. HALLDEN PRINTING TELEGRAPH SYSTEM Filed Jan. 21, 1928 s. HALL%E/N awn? m FREDERICK Patented July 23, 1929.

area *S FREDERICK G. HALLDEN, OF JAMAICA, NEW YORK, ASSIGNOR TO POSTAL TELEGRAPH- UABLE COMPANY, OF NEW YORK, 11'. Y., A CORPORATION OF CONNECTICUT.

PRINTING-TELEGRAPH SYSTEM.

Application filed January 21, 1928. Serial No. 248,284.

This invention relates to printing telegraph systems and more particularly to means for the local operation or testing of printing telegraph apparatus.

The principal object of this invention is to provide an inexpensive and simple means of testing tape controlled transmitters and printers of the well-known live-unit code type such as are commonly used in multiplex printing telegraphy.

Another object of this invention is to provide an inexpensive and simple means of checking the accuracy of perforated tapes.

Devices heretofore used for the testing of transmitters and printers have included a rotary motor driven distributor. This rotary distributor is expensive to manufacture and requires considerable attention to maintain in good running order.

My invention does not require any rotary distributing apparatus. I am able to eliminate the rotary distributor by substituting for it a vibrating relay system and arranging that each combination of impulses set up in the transmitter is transferred to the printer magnets simultaneously instead of consecutively.

Other objects of this invention will be apparent from the following description when read in connection with the accompanying drawing which shows schematically one embodiment of the invention.

The polarized vibrating relay 1 is connected so that it functions in a manner'similar to the well-known Gulstad relay. Positive potential is applied to contact 2 through resistance 3, and negative potential is applied to contact 4 through the Winding of marginal relay 5. The armature 6 is connected to the junction of relay windings 7 and 8. When armature 6 for example, makes contact with 2 a current flows momentarily through Winding 7, condenser 9 and to the midpoint of potentiometer 10 and the direction of the current flow is such as to hold the armature firm.- ly against the contact while the condenser is charging. A smaller current also flows through winding 8, resistance 11 to potentiometer 10. The current flows through winding 8 in such direction as to tend to move the armature 6 away from contact 2 but the influence of winding 8 does not become effective until the charging current through condenser 9 is reduced in value. When the opposing current through winding 8 finally starts to move armature 6 the condenser 9 discharges through winding 7 winding 8 and resistance 11 in series and the armature is quickly moved to the opposite contact. lVhen the tongue reaches contact 4 the same cycle of operation is gone through except that the direction of all currents is reversed. The period of vibration of the armature may be altered by changing the value of resistance 11 or condenser 9, as is well-known in the art.

telay 5 is marginally adjusted so that it operates only during the peak of the charging current to condenser 9 when armature 6 is resting on contact 4.

From the foregoing it will be apparent that if relay 1 is vibratin at, say, six cycles per second then relay 5 also operates at the same frequency and that the duration of, each operation of relay 5 is brief as compared to the time that armature'G of relay 1 is resting on contact 4.

Contacts 12 and 13 of relay 5 are both connected to negative potential. Each operation of relay 5 energizes the operating magnet 14 of printer 15 and operating magnet 16 of tape transmitter 17. Magnet 16, being momentarily energized moves the perforated tape ahead one letter and the new letter combination is set up in the transmitter contacts 18, 19, 20, 21 and 22 when magnet 16 is deenergized. Magnet 14 beingenergized trips the operating mechanism of the printer which then proceeds to print the letter combination previously set up in selector magnets 23, 24, 25, 26 and 27. I 7

Each succeeding operation of relay 5 initiates the cycleof operations of the transmitter and printer.

The double-pole single-throw switch 28 is for the purpose of starting and stopping the complete testing device.

Although the invention has been disclosed and described in conjunction with a particular type of printing telegraph apparatus it is, of course, obvious that various departures may be made from the embodiment described without departing from the spirit or narrowing scope of the present invention.

I claim:

1. In a local recording system, a tape controlled transmitter, a receiver controlled by said transmitter, a vibrating relay system, said vibrating relay system initating the operations of said transmitter and receiver.

2. An electrical device comprising, a tape controlled transmitter, a printer controlled by said transmitter, a vibrating relay system, said vibrating relay system initiating the operations of said transmitter and printer.

3. An electrical device comprising, a tape controlled transmitter, a printer controlled by said transmitter, a polarized vibrating relay, means for altering the vibratory rate of said polarized vibrating relay, a secondary relay operated from sald polarized vibrating relay, said secondary relay initiating the operations of said itransmitterand printer.

4;. An impulse generator comprising a vibrating relay, means for altering the rate of vibration ofisaid relay, a marginal relay controlled by said vibrating relay, said marginal relay operating once for each cycle of operation of said vibrating relay, and contacts on said marginal relay for supplying FREDERICK Gr. HALLDEN.

impulses.

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