US1773866A - Electric transmitter suitable for use in automatic telegraphy - Google Patents

Description

ug 1930- R. D. SALMON 3. 3

ELECTRIC TRANSMITTER SUITABLE FOR USE IN AUTOMATIC TELEGRKPHY Filed Feb. 24, 1928 3Shees-Sheet 1 Aug. 26, 1930. v R. D. SALMON 1,773,865 ELECTRIC T RANSMI TTER SUITABLE FOR USE IN Au'romA'rIq TELEGRAPH! Filed Feb. 24, 1928 s Sheets-Sheet 2.

Aug. 26, 1930. v D. SALMON 1,773,866-

ELEQTRIC, TRANSMITTER SUITABLE FDR USE IN AUTOMATIC TELEGRAPHYv Filed Feb. 24, 1928 3 Sheets-Sheet '34 Patented Aug. 26, 1930' NI ED- STATES PATENT oFFics-j REGINALD DENNIS SALMON, or CROKYYDONJENGLAND', ASSIGNOR, BY .MEsnn-AssreN MENTS, TocR En ANDCOMPANY LIMITED/0E onoynon, ENGLAND ELECTRIC 'rnAnsMIT'rERsUI'rABLE FOR USE IN AUroMn'rro 'rEnEGRAPHY i 1 Application filed February 24, 1928. Serial No. 256,792, and, in Great Britain March 7, 927.

Thisinvention relates toel ectric transmitters of the kindsuitable for u'seFinautoinatic telegraphy, and which. are controlled either by tape 'punchedto accord with a multiple unit system, or by a keyboard, and which is adapted totransmit signals for controlling,

at a distance therefrom, printing or other receiving mechanism, either of the start-stop, or continuously running type. The invention relates particularly to that type of such electric transmitters in which a single switch contactismovable into and out of engage.

ment with but a single pair of stationary positiveiand negative'contacts and is controlled,

' as to position, successively in respect'of. each signal unit, the switch movements being due I to the motor operation of a series of cam devices, acting in. cyclic order, upon members the movements of which may or may not be transmitted to the movable switch member, in accordance with the condition of the punched tape presented to; a series of peckers under the control ofthe cam or other-devices and the tape, or to the relative position of a series of combination bars under the control of a. V keyboard.

In; electric transmitters of the kind re-. ferred to, controlled byg-punched, tape, thev movable switch contact haszbeen positively connected to. actuating means, such for 'instance as a spring controlled pivoted plate, subject tothe movementof levers that are under the joint control of'the the series of cam devices, the peckers and punched tape,

the movable switch contact being normally held against one of the stationary contacts,

usually the .negativecontact, by the spring controlled; plate, when the levers and peckersv are in their. inoperative position. but being moved into contact with the opposite stationary contact, by one or other of the pecker 7 controlled levers,'acted upon by a spring of greater strength than that of the spring associated with: the 'movable' contact actuating plate, whenever the'corresponding pecker is enabled to entera hole in the associated punched tape. v w y 'The'present invention has reference to improvements in electric transmitters of Y the kind above referred toyzindithas for its 0b-.

'more clearly defined than usual.

j ect to improve the construction and. operation of such apparatus and in particular 'toenable the movable contact of the switch device to act ina quicker manner and" make more effective contact with the. stationary,

contacts than heretofore, so that the signals transmitted thereby shall be stronger and For this purpose, the movable switchcon I tact arranged between the positive and nega tive stationary contactsof the switch ClGVlCG, instead of being fixed to the spring controlled actuating meansfis mounted independently of such spring controlled means but adapted to .beinovedin each direction bysuch actu ating means under the cont-rol'ofperforated l tape or combination bars, a and to be held against the contact towards which it has-been moved, :with the minimum of bouncing or rebounding, by the action thereon of an inde-.

tact partly from one stationary contact towardjthe other stationarynontact and thatv so i when the'movable contact has justpassed its. 7 mid position; the, spring controlled .antibounce device will comeinto actionto com I plete the movement of the movable "contact and hold such contact firmly against the" stationary contact towardshwhich it. was first moved by. thev spring eon-trolled actuated means. In this case, independent;

.me'ans, 'such as stops, maybe provided to limitjthe movement .OfJtllQQSPIlIIg con 70 Y I pendent springiactuated device hereinafter H called for. distinction the antirbounce device. The arrangement may. be such that the-said the transmitter rendered capable of acting efiiciently at a higher speed than before and the movable contact is caused to act practically in a dead-beat manner.

A switch having a movable contact and actuating means therefore, adapted to act in either of the ways set forth, can be variously modified and be embodied in various constructions of electric transmitters of the kind referred to.

In the accompanying illustrative drawings, Fig. 1 shows in front elevation and Fig. 2 in rear elevation with part broken away, one construction of electric transmitter according to the invention. Fig. 3 is a section on the line III-III of Fig. 1. Fig. 4 is a front elevation, to a larger scale, of the contact block shown in Fig. 1. Fig. 5 is a plan view of the pecker levers and peckers shown in Fig. 1. Figs. 6 and 7 are detail views to an enlarged scale, showing a spring controlled plate for moving the movable contact first in one direction and then in the other.

In the example shown in Figs. 1 to 5, 1 is the movable contact arranged between the stationary contacts 2 and 3 of the switch device and carried by a metal arm or blade 4 pivoted at one end at 4 to a plate 5 fixed to a block 5 of insulating material to which the contacts 2 and 3 are also fixed. The tape controlled actuating means is a spring controlled plate 6 pivoted at 7 and similar in function to that used in known electric transmitters of the type referred to, but such plate instead of carrying the movable contact 1, as heretofore, is made of bifurcated shape and one of its arms is provided with a fork-like device 6 that loosely embraces the free end of the arm or blade 4 carrying the movable contact 1. The anti-bounce device consists of a. separate spring controlled jockey pulley or roller 8 adapted to act against the free V-shaped end portion of the said arm or blade 4, or it may be upon a similar shaped projection carried by some other part of the blade. The jockey pulley in the example shown, is mounted on one side of an arm 8 pivoted at 8 and connected to one end of a blade spring 8 the other end of which is fixed in position by an adjustable eccentric 8 9 is a coiled spring connected to the plate 6 and adapted to move the same in the direction of the arrow w in Fig. 1 and cause the forklike device 6 to move the blade 4 in a direction to cause the movable contact 1 to bear against the contact 3 and normally hold it in that position. The arrangement is such that the spring controlled plate 6 can, under the control of perforated tape and through the fork-like device 6*, move the blade 4 in either direction, to move the switch contact 1 from the stationary contact against which it is bearing, towards and against the opposite stationary contact, and that the spring controlled jockey pulley 8 will act to hold the movable contact against the said stationary contact, with the minimum of bouncing or rebounding of the contact. The fork-like device 6 (Figs. 1 and 6) may, when the spring controlled plate 6 is moved in either direction, cause the contact 1 to move from the contact 2 or 3 against which it is bearing, toward and against the opposite contact, the jockey pulley S acting to hold the movable contact firmly against the stationary contact toward and against which it is moved by the fork-like device 6 and prevent bounce or rebound or the movable contact. .01" the forklike device 6 may, when the spring con trolled plate 6 is moved in either direction, act to move the contact 1 from the contact 2 or 3 against which it is hearing, only partly towards the opposite contact and slightly past 1e centre of the ocirey pulley 8 which afterwards acts to complete the motion of the contact, independently of the plate 6, and hold the contact firmly against the said opposite contact, with the minimum of bouncing of the center. In this case, stops 6 and 6 are provided, as shown in Fig. 7, to limit the movement of the plate 6 in each direction.

In an arrangement of either of these kinds, the movable switch contact 1 may be con nected to a telegraph line either directly, or, it may be, indirectly through a line relay in known way, and the two stationary contacts 2 and 3 be connected to the positive and nega tive poles respectively of a split battery 11 (Fig. 6) ti e middle point of which is preferably adapted to be connected to earth in the usual known way, the movable contact 1 normally being held. by the means described against one of the stationary contacts, it may be against the negative contact 3.

The spring controlled plate 6 may be arrangedto be raised, against the action of its spring 9, to cause the movable switch contact 1 to move from the stationary contact 3 against which it normally bears, to or towards the other stationary contact 2, by the free end of one or other of a series of separate spring controlled lever arms 12 arranged below one of the arms of the bifurcated plate 6 and carrying the tape packers 13, the lever arms 12 being pivoted at their other ends at 12, and arranged below a series of rotary cam devices 14 adapted to release the lever arms 12 in cyclic order and permit each of them to rise in succession, under the action of 1..-

its spring 12*, if its pecker is then opposite a corresponding hole in the tape, as in the construction of electric transmitter described in the specification of an application for Letters Patent filed 16th August, 1926, Serial No. 129,440. 7

The invention can however advantageous ly be embodied in electric transmitters of other knownor suitable kind of the type referred to, as for instance those in which the pecker levers act indirectly upon a spring controlled'switch operating plate or lever v I the action of its spring 9. l For'e'xample, as-

suming that the total lift of each pecker 13, as'controlled by its cam 14, be divided-into five parts, then the pecker may be allowed to rise through 'part of its upward travel before touching or entering the tape, and then through another th part of its upward travel, in the tape before its corresponding lever arm 12 touches the adjacent arm of the springactuated plate 6, then'through another ths part of its travel in the tape before causing the said plate to move'the movable switch contact 1 from the negative switch contact to the positive switch contact, the remaining th part of its possible travel, during the first small portion of which the plate moves the contact 1 from the negativecontact r 3 to the positive contact 2, being idle andto spare,'that is to say, it is arrested by the spring controlled plate coming to' rest on. the movable contact arm before it has completed its total possible movement as allowed by its cam 14. p

The series of rotary cam devices 14 used in the electric transmitter for moving the I pecker levers 12 downward against theaction of their springs 12* and afterwards releasing them, in cyclic order, may advantageously be constituted by the bottom of a series of annular grooves cut in a sleeve 17 (Fig. 3) fixed to a driving shaft '18, the bottom of each groove having a portion thereof cut away to form a flat surface on its periphery, the several flat surfaces being spaced apart angu larly around the sleeve. The collars between the grooves act as guides for the levers 12.

When the electric transmitter is designed to control start-stop printing'mechanism, a

cam controlled lever 12 without a pecker is provided to causethe movable switch contact 1 tobear against say the positive station- I ary contact 2 to transmit a starting signal,

and an interval of time is arranged to be left I I between the operation of the-last lever 12 carrying a pecker 13 andthe lever 12 by suitably adjusting the timing of the correresponding cam device 14, in order to leave the movable switch contact 1 for a sufiicient time against say the positive contact 2, to send a stoppingsignal, as in the electric tranmitter described in the specification of the former application" for Letters Patent Serial No. 129,440 hereinbefore referred to.

may be I Or a caincontrolled lever without a pecker, arranged to transmit a stopping signal.

In the case where the movable switch mem-j.

ber is under the control of" a key board, the controlling means maybe of the kind described in the specification of a former application for Letters Patent Serial No. 1253, 141

filedv 16th August I 1926. d

What I claim is 5 p v 1. A telegraph transmitter comprising-a pairof stationary contacts, a movable contact arranged between and adapted to co-act I with the said stationarycontacts,'rneansto I hold the said movable contact firmly against either of'the said stationary contacts,-a'nd' means to actuate the said movable contact from a plurality of cam and spring operated Y levers and controlledin accordance with signals to be transmitted, consisting essentially of a single member mounted independently of, but in operable relation"with, the said movable contact. g

2. A telegraph transmitter comprising a pair of stationary contacts, a; movable switch contact arranged between the said stationary contacts," independent means to hold the saidniovable contact withtheminimumof bounc-' ing against the stationarycontact toward which it has been moved,'and means to actuate the said movable contact in accordance with signals to be transmitted, comprisingqa plurality of cam and spring operated levers co operatingwith a single member which is in operable relation with the said movable contact during aportion only of the movement thereof.

3. A telegraph transmitter comprising a pair of stationary contacts, a movable switch contact arranged between the said stationary contacts, a plurality of cam and spring operated. levers" operating. successively and individually according to signals to be trans- 1 mitted, a spring controlled'plate responsive to tlie movement of the said levers and carrying abutments adapted to engage with the said movable switch contact during a portion only of its movement, and independent means to complete the movement'ofthe said movable switch contact and to hold it firmly against the. stationary. contact. towards whichit-has been moved.

A telegraph transmitter comprising a pa r of stationary contacts, 'amovable switch contact arranged between the saidstationary contacts, a plurality of cam and springop-- erated levers operating"successively and indlvldually and controlled in accordance'with signals to be transmitted, a springcontrolled plate responslve to the movement of any one ofthe' said levers, and carrying a fork-like device loosely. embracingthe end of the said '7 movable switch contact andadapted to ens gage the same near theextreme positions of the said fork-likedevice, stops to limit the motion of the said fork-like device, and independent means to complete the movement of the said movable switch contact and to hold it firmly against the contact towards which it has been moved.

5. A telegraph transmitter comprising a pair of stationary contacts, a movable switch contact arranged between the said stationary contacts, a plurality of cam and spring operated levers operating successively and individually according to signals to be transmitted, a spring controlled plate responsive to the movement of the said levers and carrying a forkdike device loosely embii-vcing the end of the said movable switch contact and adapted to move the same for a portion only of its travel from one stationary contact to the other, and independent spring controlled means to complete the movement of the said movable switch contact and to hold it firmly against the stationary contact towards which it has been moved.

6. A telegraph transmitter compr'sing a pair of stationary contacts, a movable switch contact arranged between the said stationary contacts, a plurality of cam and sprin operated levers operating successively and individually and controlled in accordance with signals to be transmitted, a spring controlled plate responsive to the movement of any one of the said levers and carrying a fork-like device loosely embracing the end of the said movable switch contact and adapted to engage the same near the extreme positions of the said fork like device, stops to limit the motion of the said fork-like device and a spring controlled jockey roller adapted to act against the free end of the said movable switch contact and to hold the same firmly against the stationary contact towards which it has been moved.

7. A telegraph transmitter comprising a pair of stationarycontacts, a movable switch contact arranged between thesaid stationary contacts, a plurality of cam and spring operated levers operating successively and individually according to signals to be transmitted, a spring controlled plate responsive to the movement of the said levers and carrying a fork-like device loosely embracing the end of the said movable. switch contact and adapted to move the same for a portion only of its travel from one stationary contact to the other, and a spring controlled ockey roller adapted to act against the free end of the said movable switch contact to complete the movement of the same and to hold it firmly with a minimum of bouncing against the stationary contact towards which it has been moved.

8. A telegraph transmitter for transmitting signals previously recorded as perform tions in a tape, comprising horizontal levers pivoted at one end, peckers pivoted near the other ends of the said levers, came means acting directly on the said levers intermediate the pivoted ends and the peclzers to release the said levers successively for movement, a member having one portion extending horizontally over all the said levers at the ends nearest the said peckers and another portion at an angle to the first mentioned portion but in substantially the same vertical plane and carrying a forl lil e device loosely embracing the end of a movable contact, stationary contacts between which the said movable contact operates, and means for holding the said movable contact against the contact to which it was last moved.

Signed at London, England, this 14th day of February, 1928.

REGINALD DENNIS SALMON.

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