US2421681A

US2421681A - Typewriter word counter

Info

Publication number: US2421681A
Application number: US522099A
Authority: US
Inventors: Chaskin Harold
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-02-12
Filing date: 1944-02-12
Publication date: 1947-06-03
Anticipated expiration: 1964-06-03

Description

June 3, 1947. H. CHASKIN 2,421,681

TYPEWRITER WORD COUNTER Filed Feb. 12, 1944 5 Sheets-Sheet 1 M5 Q Z0 1 INVENTOR. ffarold asl'zh June 3, 1947. CHASKIN 2,421,681

TYPEWRITER WORD COUNTER Filed Feb. 12, 1944 5 Sheets-Sheet 2 J4 gr gJa a;

INVENTOR. ("/2 as/f' e'rz- June 3, 1947.

H. CHASKIN TYPEWRI. TER WORD COUNTER Filed Feb. 12, 1944 5 Sheets-Sheet 3 INVENTOR. 62 5/072,

June 1947. H. CHASKIN 2,421,681

TYPEWRITER WORD COUNTER Filed Feb. 12, 1944 5 Sheets-Sheet 4 IN V EN TOR.

H. CHASKIN TYPEWRITER WORD COUNTER June 3, 1947. 2,421,681

Filed Feb. 12, 1944 5 Sheets-Sheet 5 INVENTOR. ffa T0562 C /zzz 6/2757? Patented June 3, 1947 UNITED STATES PATENT OFFICE TYPEWRITER WORD COUNTER Harold Chaskin, New York, N. Y.

Application February 12, 1944, Serial No. 522,099

11 Claims. 1

This invention relates generally to typewriting machines and more particularly to means for automatically counting the number of words typed.

In many typewriting operations it is highly desirable to keep track of the number of words written. It is of course a very simple matter to provide a counter or register to be actuated either by the usual spacer bar or by a special counter key. The use of a special key however requires such an interference with the normal operating procedure as to render it impractical.

On the other hand, extremely inaccurate results occur when using the space bar as the counter-actuator as the space bar is repeatedly used not only at the end of a word but also to provide additional spacing.

It is an object of my invention to provide mechanism for counting the number of words written and at the same time eliminate the foregoing objections.

Another object is to provide counting mechanism which can be combined with standard mechanisms without requiring any changes in the various operating parts.

Another important object is to provide mechanisms for counting words by which the counting is so-to-speak accomplished without any conscious effort on the part of the operator and without interfering with the normal operations or functions of the machine.

To accomplish these objects I provide mechanism which can be coordinated with any type of machine and which will automatically count and register the words as written without any special attention to thespace ba action and without requiring any special key.

I accordingly provide mechanism which automatically initiates action of the counter when any letter key is depressed to start a word. The counter then remains inactive and is not reset until either the space bar is depressed at the end of the word, Or in case the word ends at the end of a line and the space bar is not depressed, until the carrier is returned to start a new line.

I also provide mechanism for preventing the accidental completion of the count of the first part of the hyphenated word as a full word by making ineffectual the movement of the space bar immediately following a. hyphen.

Mechanism is also provided to complete the counting and the resetting of the parts in case the operator uses a dash character immediately following a finished word instead of striking the space bar.

It will be seen that the ideal action depends upon the novel step of starting the counter whenever a word is started and completing the counter action and restoring it ready to count another word only when the mechanism is ready to start another word.

The counter mechanism is not shown in detail because any conventional type may be used. The invention relates to the actuating and control mechanism for any suitable machine and counter.

In the drawings,

Fig. 1 is a plan view of the keyboard section of a standard typewriting machine embodying my invention.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1. a

Fig. 3 is a sectional view on the plane of the line 33 of Fig. 1.

Fig. 4 is a rear view of the typewriter showing the carriage actuated switching mechanism.

Fig. 5 is a side view thereof.

Fig. 6 is a diagrammatic view showing various circuits.

Figs. 7 to 10, inclusive, are enlarged detail views showing the carriage actuated switching mechanism. 7

Fig. 11 is a diagrammatic view showing the wiring for rectification of alternating current for the phototube circuit.

Fig. 12 is a part plan and part diagrammatic view showing the chassis for the counter unit and relay elements.

Fig. 13 is a front elevational view of the apparatus of Fig. 12 with the cover removed.

My invention contemplates the use of a standard typewriter with a counter device which is electrically connected to a source of electromotive power, such as a house supply.

In Figs. 1, 2 and 3, a fragment of a standard typewriter machine is shown comprising the front frame I which defines the space for the bank of character keys or keyboard. This keyboard is of the standard type consisting of an upper row of numerals and punctuation marks and three lower rows including letter keys 2.

Underneath the levers of the letter keys 2 and positioned in the path of movement of said levers is a pivotally mounted frame 3 which is Stepped in formation, in cross section, to correspond to the stepped formation of the bank of key levers whereby upon movement of any of said letter keys said frame is moved downwardly.

It will be noted from Fig. 1 that this frame 3 does not extend under the furthermost three character keys on the right side of the lowermost plane of the row of keys, under the furthermost two character keys on the right side of the next higher row of keys, under the furthermost key on the right side of the next higher row of keys nor under any of the keys on the top row.

Under the frame 3 and in the path of movement thereof and centrally of the bank of keys is the movable contact of an electric switch 4, which switch is adapted to be closed by the engagement of said frame with its movable contact.

Another switch 20 is similarly positioned adjacent switch 4 and is adapted to be opened by depression of the frame 3.

Still another switch I5 is positioned underneath and in the path of movement of the lever of the character key 6 and its movable contact is adapted to be actuated by said lever.

Under the lever of the hyphen key I8a is an- 7 other switch I8, the movable contact of which is adapted to be engaged by said lever upon movement thereof for operating the switch.

All of the foregoing switches are adapted to control various circuits which include the counter device I5 which may be positioned on a support adjacent the support for the typewriter. The counter is of the conventional type having an external actuating lever I4 and automatic means for registering a number and restoring the parts (not shown) My present invention contemplates opening the circuit through the counter by means of a photoelectrically actuated switch. For this purpose a photocell 'I is mounted in any suitable manner inside of one of the side walls of frame I, and an exciter light 13 is mounted in a line with said photocell I on the opposite wall of the frame. The photocell and exciter light are positioned just enough below the space bar I2 of the machine to permit the light to continuously beam on the photocell to energize the same for permitting electric current to pass therethrough, but also to permit said space bar to interrupt said beam upon downward movement of the bar and thereby open the circuit.

The counter device I5 and associated parts are shown in Figs. 12 and 13 and may be mounted on a suitable chassis which supports a relay 5, a make and break switch 6, and spaced

relays

8, 8a and 9. A solenoid I is positioned adjacent switch so that its plunger II is adapted to engage the counting lever I 4 of the counter I5.

A relay device I9 which is connected in circuit with the switches I8 and 20 is also mounted on the chassis.

The photocell 'I is operated by a source of direct current which is obtained as shown in Fig. 11. A transformer 2| has the primary thereof connected to a source of alternating current. Two

rectifier units

22 and 23 are connected to the secondary winding of the transformer. The cathodes of the rectifier units are heated, either directly as shown, or indirectly, by current derived from one secondary winding 24 of transformer 2 I. Another secondary winding 24 is connected at the eX- tremities thereof to the anodes of the respective rectifier units, and at the center to a filter comprising a series choke coil 25 and a shunt condenser 26. The output of this filter feeds a bleeder resistance 21, from which a substantially continuous current may be drawn, for supplying photoelectric tube I.

The main and auxiliary circuits for the various devices are shown in Fig. 6 and controlled as follows:

When the first letter of a word, for instance, the letter T of the word The is struck, it will depress the frame 3, which will move the movable contacts of switches 4 and 20, which are the make and break switches, respectively. However only the switch 4 is effective by this action and a circuit is closed through said switch from the right side of the line of the A. C. supply, said switch 4, the winding of A. C. relay 5, the movable contact and stationary contact of switch 5, to the left side of the line. The opening of switch 20 at this time has no effect on a circuit already open. Upon retraction of the frame 3, switch 4 is released flout relay 5 remains energized by a, circuit from the right side of the line, the upper make contact of said relay 5, the winding of said relay, through switch 6 to the left side of the line.

When relay 5 is thus energized. a circuit is closed from the right side of the line, the next lower contact of said relay, the winding of relay 9, to the left side of the line.

With relay 9 thus energized, a circuit is closed from one side of the D. C. line, the phototube I, the sensitive D. C. relay 8, the upper make contact of relay 9 to the other side of the D. C. line.

Thus far relays 5, 9 and 8 are in operation. Since the exciter light I3 is beamed continuously upon the phototube I, the resistance of the phototube is decreased permitting current to flow in the D. C. circuit and bringing sensitive relay 8 and lag relay 8a into operation and permitting current to pass from the right side of the A. C. line, the upper make contact of relay 8 and winding of relay 8a. Current also passes from the right side of the line, through contact of relay 8a, winding of solenoid I0, to the left side of the line. When solenoid I0 is thus energized it draws down its plunger I I, which depresses the lever I4 of the counter I5 thereby cooking the mechanism in the counter. Since the make and break switch is located directly beneath the lever I4 (Fig. 13), the switch 6 changes over to the make position. During this change over of switch 6, the relay 5 remains energized through current received from the right side of the line, through the upper make contact of said relay 5, the winding thereof, the lower make contact of relay 8 to the left side of the line.

The lag relay 8a may be omitted but is preferred for speed typewriting but if omitted the relay 8 would have to be connected directly across to relay 9.

From the foregoing it will be seen that the depressing of the letter T of the word The causes relays 5, 9, 8 and 8a to become energized and operate in that particular order followed by the operation of the solenoid l0. Any successive and subsequent strokes of the letters h and e to complete the word The have no effect on the circuits previously set up by the depressing of said letter T.

When the word The however has been completed by the depressing of the letter e after h, a space must be provided between said word The and the next word to follow and this space is provided by depressing the space bar I2. When this space bar is moved downwardly it moves across and interrupts the beam from exciter light I3 and causes the internal resistance of the phototube I to increase thereby reducing the flow of current in the relay 8. This first releases relays 8 and So, then solenoid 10, then relay 5 and finally relay 9. The counter has recorded the count of the word The and the counter mechanism has been reset preparatory to counting subsequent words.

Thus it will be seen that movement of the space bar [2 downwardly following movement of any letter key 2 will complete a word count, and cause the above cycle of operations to be accomplished. A sole movement of the space bar 12 without movement of a letter key 2 will have no effect since the solenoid 10, which controls the counting apparatus, does not become excited until the relay 8a has first operated.

It is essential that the first part of a hyphenated Word be not counted as a full word and in order to accomplish this the movement of the space bar must be made ineffectual if it takes place immediately following the movement of the hyphen key I801. Movement of this latter key will move the movable contact member of switch l8 which is directly underneath and close said switch momentarily. Referring to Fig. 6, the circuit through the switch is closed from the left side of the line, through the switch IS, the Winding of relay I9, the break switch 20, to the right side of the line. Relay l9 remains energized after switch I 8 becomes released by the return of the key. The circuit is then from the right side of the line, switch 20, the winding and upper make contact of relay l9 to the left side of the line.

The effect of the downward movement of the hyphen key |8a is thus to bring the relay l9 into the circuit. Any movement of the space bar, whether accidentally or not, will have no effect on the counter action, as the solenoid ID will not be released as long as the relay [9 is in operated position. The circuit for the solenoid isthen from the left side of the line, the winding of solenoid, the second or intermediate contact of relay 9, the second make contact of relay H), to the right side of the line,

With the circuit thus set up, a downward movement of the space bar [2 breaking the beam to the phototube 1 will cause the relays 8 and 8a to momentarily release but inasmuch as solenoid I is not affected and does not move, relay 5 remains energized and operative, and because of this, relay 9 remains energized in operated position, causing relays 8 and 8a to operate again when the beam has been restored by removal of the space bar. Hence no counter actuation or indication of a completed Word can take place when the hyphen relay I9 is operated. This is as it should be, as a hyphen appears in the body of a word and it is not desirable to count one portion of a hyphenated Word as a complete Word.

It is also important that the count of the last word on a line be completed. It often happens that the typist fails to strike the space bar after such last word but instead returns the carriage and platen to a new line position. I have made provision for such a contingency.

On the rear of the typewriting casing at the top thereof adjacent the slidable carriage and at a suitable point adjacent the position of the carriage for starting a new line is located a trip switch IT. This switch includes a stationary contact member Hz and a movable contact member IT pivotally mounted on pivot pin 33. Pivotally mounted on the movable contact member I1 is a cam bar 30, its pivotal pin 32 being positioned off and above the center so that it can fall by gravity to vertical position as shown in Fig. 7, and its upper edge bein rojected above the upper edge of the movable contact. A coiled spring 34 urges movable contact H into engagement with stationary contact Hz: to close the circuit, and such closing movement is limited by a stop pin 3-5. When the last letter of the last word on the line has been struck and the typist fails to strike the space bar in order to complete the count of said word and restore the parts, movement of the carriage to the left of the typewriter casing for new line position, which is usually done by the line space lever, will cause a projecting member 29 suitably carried by said carriage to strike the projecting portion of the cam bar 30 and tilt the same out of the way of said projecting member 29 as seen in Fig. 9 and move its lower end against a stop pin 3| on the movable contact member Continued tilting movement of said cam 30 will cause the movable contact member l1 and cam 30 to move as a unit about pivot 33 thereby moving said movable contact away from the stationary contact llx as seen in Fig. 9 to break the circuit.

The circuit including this switch I! (see Fig. 6) is from the right side of the line, the exciter light l3, the break switch 16, trip switch IT, to the left side of the line. When this circuit is broken as aforesaid, the exciter light is extinguished, eliminating the beam from phototube 1 and thereby darkening the latter and making it ineffective, thereby reducing the flow of current in the relays 8 and 8a, which in turn releases solenoid 10, then relay 5 and then relay 9, at which time the counter action is completed, the word counted and the various elements of the electrical system restored to normal positions, preparatory to counting subsequent words.

When the carriage moves to the left, free of the cam 30, the cam bar and movable contact member will be moved by spring 34 to normal vertical positions as seen in Fig, '7. The cam bar however is so mounted on its pivot pin 32 that when the carriage is again advanced to the right of the machine, the projecting member 29 on the carriage merely tilts the cam bar clockwise as seen in Fig. '7 and when the member 29 passes the cam bar swings back to normal position by gravity.

When the trip switch I1 is thus operated to complete the count, subsequent movement of the space bar i2, without first moving a letter key will be ineffective to complete a count so that the end word cannot be counted more than once.

Certain typists enclose parenthetical or subordinate matter in parenthesis characters or between dash characters and in using dash characters for this purpose often print the clash immediately following the last letter of the previous word without leaving a space. My invention contemplates the use of dash characters for this purpose without using a space between the dash character and the last letter of the previous word, and provides mechanism for completing the count of said previous word upon movement of the dash character.

In carrying out this feature of my invention, it is contemplated that the upper case character of the 6 key be used as the dash character. This can readily be done by shifting the keys for upper case writing by striking the Shift key and then by turning the platen slightly to bring said upper case character to midway the height of the letters and then striking said 6 key. Underneath said 6 key and in the path of its movement is a break switch l6, which switch is in the circuit with exciter light l3. When the key 6 is moved downwardly,

it engages the movable contact of switch l6 to open the same and thus break the circuit through the exciter light l3, extinguishing said light and making phototube l inefiective, which in turn releases relays 8 and 8a and then solenoid l0, permitting the counter lever to complete the count and return the parts to normal condition preparatory to subsequent counting.

It will be seen from the foregoing that I have provided three methods of interrupting the beam to phototube l in order to break the circuit for completin the counting action and restoring the various relay elements to normal positions. One is by moving the space bar I2 downwardly into the path of said beam. Another is by striking the dash key and the third is by moving the carriage for tripping the switch l'l. When the space bar is moved to complete the count action, the trip switch i! cannot be operated to complete the count and vice versa, when the trip switch is operated the space bar I2 cannot be operated to complete a count. If all three were operated in succession, only one of them would be effective.

A pilot light 42, preferably red, may be mounted on the counter chassis for visibly indicating that the word i being counted and has been completed. This permits the typist to visualize an error in counting a word that should not be counted and is a warning that the error should be corrected which can be done manually by turning the hand screw (not shown) on the counter backwardly to erase the count of the word. When the first letter of a word is depressed the

relays

5 and 9 are energized in that particular order and the current will flow from the right side of the line, through pilot light 42, the lower break contact of relay IS, the third mak contact of relay 9, the third make contact of relay 5, to the left side of the line. If the space bar is depressed it will cause the relays 8 and 8a to be released. which in turn releases relays 5 and 9, thereby extinguishing the pilot light upon the completion of the count.

In case a hyphenated word is being typed and the letter keys have been moved setting up the

relay

5, 9, 8 and 8a and the solenoid l and the hyphen key l8a is then struck and any one oi the three aforesaid methods of interrupting the beam to the phototube l is accidentally used, I so arrange the pilot light 42 in circuit that said light will not go out, since the word has not been Completed. The circuit for the pilot light is from the right side of the line, the light 42, the lower make contact of relay I9, the lower make contacts of

relays

9 and 5, to the left side oi the line. The pilot light stays on because with the operation of the relay IS, the solenoid til does not permit the release of relay and hence of relay 9, thereby maintaining the circuit for the pilot light. In the process of typing, if the relay 59 has been released by the operation or" a letter key, the pilot light 42 will be extinguished by the operation of the space bar (2, trip switch ll or dash switch l5.

It will be noted that the only way to terminate the relay interlocking action of the hyphen relay i9 is by operation of a letter key which in depressing the frame 3 causes it to actuate the break switch thereby opening the circuit through the relay IS,

The current for operating the mechanisms may be obtained from any suitable source by means of a flexible conductor which has a plug member at one end adapted to be connected to a socket of the supply, and has a socket at its other end adapted to be connected to a plug device 39 on one side of the chassis of the counter. The other side of the chassis is provided with an 8-point outlet member 38 to which is connected a socket on one end of a flexible conductor which has a plug 4| at its other end adapted to be connected to a socket 43 on the typewriter machine.

While I have shown the phototube circuit as a D. C. circuit, it will be understood that certain phototubes may be used in an A. C. circuit, in which case the relay 8 would be of a suitable type and the devices shown in Fig. 11 would not be necessary. The other necessary changes in connections will be apparent to one skilled in the art.

It will be understood that individual switches might be provided for each letter key instead of having a single frame 3 as shown.

I claim:

1. In a typewriting machine having type-keys operatively connected to a counting machine having a counting lever, the combination with main and auxiliary electric circuits associated with said counting lever, of a main switch controlling said circuits, a movable frame on said typewriting machine depressible by certain of said keys to close said main switch for initiating movement of the counting lever for cocking the counting mechanism and a photoelectrically actuated circuit breaker operable by a movable part of said typewriting machine to open the circuits for permitting said counting mechanism to complete its counting movement and for restoring the parts to normal condition,

2. In combination with a typewriting machine and a counting machine operatively connected therewith, relays for operating the counting lever of said counting machine, independent circuits for energizing said relays, means actuated by each of the letter keys of the typewriting machine to close certain of said circuits, a main line circuit supplying current to said independent circuits, a photocell, an exciter lamp therefor, and a main line switch operable to close the main line circuit whereby said relays are energized for initiating partial movement of the counting lever of the counting machine to cock the counting mechanism the space bar of the typewriting machine being positioned between said photocell and lamp for breaking the main and independent circuits to permit complete movement of the counting mechanism for counting and to restore the parts to normal condition.

3. In a typewritin-g machine and a counting machine, having a counting lever, operatively connected therewith, the combination with means for actuating said counting lever including a main line circuit a plurality of relays, an independent circuit for each of said relays, means in common actuated by the depression of the letter keys of the typewriting machine for closing said main line and for closing certain of said independent circuits whereby upon depression of any of said letter keys said counting lever will be operated to cock the counting mechanism, a photocell, an exciter lamp therefor the spacing bar of the typewriting machine being positioned between said phtocell and lamp for opening said circuits to permit the counting mechanism to complete automatically its counting movement and to permit the parts to return to normal condition.

4. Means for automatically operating a counting machine from a typewriting machine, said counting machine having a counting lever and said typewriting machine having a standard keyboard and spacing bar including an electric circuit having a switch member and a circuit breaker, said switch member being adapted to be closed by movement of certain of the keys of said typewriting machine, means operated by the closing of said switch for initiating the partial movement of said counting lever to cock the counting mechanism, a photocell, an exciter lamp therefor, the spacing bar being positioned between the photocell and lamp whereupon movement thereof said circuit is broken and the counting mechanism is permitted to complete its counting movement and the parts are permitted to return to normal con dition.

5. Means for automatically operating a counting machine having an external counting lever from a typewriting machine including a source of electromotive force, a main line circuit, an auxiliary circuit in parallel therewith, a solenoid in said auxiliary circuit, said solenoid having a plunger adapted to engage and to initiate partial operation of the counting lever for cocking the mechanism of the counting machine, and a photoelectric device actuated by movement of the space bar of the typewriting machine to open the auxiliary and main circuits whereby the counting mechanism will complete its movement for completing the count and whereby the parts will be restored to normal condition.

6. Means for automatically operating a counting machine from a standard typewriting machine including a source of electromotive force a main line circuit, auxiliary circuits connected to said main line circuit, means controlled by certain of the typewriter keys for closing said circuits to cock the mechanism of the counting machine and a circuit breaker in one of said auxiliary circuits actuated by the space bar of the typewriting machine for opening the main and auxiliary circuits thereby permitting said counting mechanism to complete its movement for registering the count and thereby restoring the parts to normal condition.

7. Means for automatically operating a counting machine from a typewriting machine, said counting machine having a counting lever and said typewriting machine having a standard keyboard and spacing bar lever including a source of electromotive force an electric circuit, a switch member in said circuit, a photocell in said circuit, an exciter lamp therefor, a movable frame member on the typewriter machine actuated by the letter keys of said typewriting machine and adapted to engage the movable contact of said switch for closing the same, and means including a solenoid operated by the closing of said switch fOr removing said counting lever to cook the counting mechanism, said spacing bar being so positioned that movement thereof blocks the light to said photocell thereby deenergizlng said photocell and opening said circuit through said solenoid whereby the counting mechanism is permitted to complete its counting movement and whereby the parts are restored to normal condition.

8. Means for automatically operating a counting machine from a typewriting machine, said counting machine having a counting lever and said typewriting machine having a sliding carriage, a. standard keyboard and a spacing bar including a source of electromotive force, an electric circuit, a switch in said circuit, a photocell in said circuit, an exciter lamp therefor another switch in said circuit, said first-named switch being adapted to be closed by movement of certain of the keys of said typewriting machine, means operated by the closing of said firstnamed switch for moving said counting lever to cook the counting mechanism and a member on said sliding carriage adapted to engage and actuate said second-named switch upon movement of the carriage for opening the circuit through said photocell whereby said circuit is opened and said counting mechanism is permitted to complete its counting movement and the parts are permitted to return to normal condition.

9. Means for automatically operating a counting machine from a typewriting machine, said counting machine having a counting lever and said typewriting machine having a standard keyboard and spacing bar including a source of electromotive force, a main circuit, a switch member in said circuit, a circuit breaker adapted to be closed by movement of certain of the keys of said typewriting machine, a photocell in said circuit, an exciter lamp therefor, means operated by the closing of said switch for moving said counting lever to cook the counting mechanism, said spacing bar being positioned between said photocell and lamp for breaking said circuit whereby upon movement thereof said circuit is broken and whereby said counting mechanism is permitted to complete its counting movement and the parts are restored to normal condition, and means for making the circuit breaking movement of the spacing bar ineffective upon depression of the spacing bar after the depression of the hyphen key.

10. Means for automatically operating a counting machine from a typewriting machine, said counting machine having a counting lever and said typewriting machine having a standard keyboard and spacing bar including a source of electromotive force, a main circuit, a switch member in said circuit adapted to be closed by movement of certain of the keys of said typewriting machine, a photocell in said circuit, an exciter lamp therefor, means operated by the closing of said switch for moving said counting lever, to cook the counting mechanism the spacing bar being positioned between said photocell and lamp whereby upon movement thereof said circuit is broken and whereby said counting mechanism is permitted to complete its counting movement and the parts are restored to normal condition and means for making the circuit breaking movement of said spacing bar ineffective upon depression of the spacing bar immediately after the depression of the hyphen key, said means including an auxiliary circuit, a switch therein adapted to be closed by the depression of said hyphen key and a relay energized by the closing of said latter switch, for maintaining said main circuit closed and for preventing restoration of the parts to normal condition upon movement of the space bar,

11. Means for automatically operating a counting machine from a standard typewriter ma chine, said counting machine having an external counting lever including a main line circuit, a switch in said circuit adapted to be closed by the movement of a letter key of said typewriter machine, a relay adapted to be energized upon the closing of said switch, another switch in said circuit; an auxiliary circuit including a relay adapted to be energized upon the energization of said main line relay; another auxiliary circuit REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,086,694 Winters Feb. 10, 1914 2,297,180 Walsh Sept. 29, 1942 10 2,346,869 Poole Apr. 18, 1944