US2919781A - Control mechanism for the motor of an electric typewriter - Google Patents

Description

CONTROL MECHANISM FOR THE MOTOR OF AN ELECTRIC TYPEWRITER Filed Sept. 9, 1957 A. RIX ETAL Jan. 5, 1960 2 Sheets-Sheet 1 O 0 mi? INVENTOR MIMIC l i/10M ATTORN EY Jan. 5, 1960 A. RlX ETA]. 2,919,781 CONTROL MECHANISM FOR THE MOTOR OF AN ELECTRIC TYPEWRITER Filed Sept. 9, 1957 2 Sheets-Sheet 2 BY WMM ATTORNEY United States Patent CONTROL MECHANISM F OR THE MOTOR OF AN ELECTRIC TYPEWRITER Albert Rix, Rotfhausen, and Manfred Sauer, Wilhelmshaven, Germany, assignors to Olympia Werke AG, Wilhelmshaven, Germany Application September 9, 1957, Serial No. 682,928 Claims priority, application Germany September 8, 1956 22 Claims. (Cl. 191-17) The present invention relates to a delay mechanism for electric typewriters, and more particularly to an apparatus for delaying the operation of the type levers until the operating means, which actuate the type levers, have reached a desired speed.

Electric typewriters are generally provided with a switch for starting the motor and the operating drum which controls the type levers. It is also known to provide an electric typewriter with an apparatus which connects the motor whenever any key of the keyboard of the typewriter is actuated. However, since it requires a certain time until the motor reaches its full speed, the operating drum may actuate the type lever associated with the first depressed key before the motor has reached its full speed, and in this event, the first imprint of the respective type lever is weak. In the event that it is desired to produce several carbon copies of the typed material, the last copy frequently does not show the first letter produced by the first actuated key which also efiected start of the motor.

It is one object of the present invention to overcome this disadvantage, and to provide an electric typewriter, in which any first actuated key of the keyboard effects start of the drive motor of the typewriter, while a strong and clearly readable imprint is produced by the type lever associated with the respective first actuated key.

It is another object of the present invention to start the drive motor and the operating means of the typewriter by moving any key of the keyboard to an intermediate position, and to effect actuation of the respective asso ciated type lever during the movement of the respective key from the intermediate position to an end position.

Another object of the present invention is to provide in an electric typewriter means for delaying the operation of any type lever until the operating means, which control all type levers, have reached full speed.

Another object of the present invention is to combine the apparatus of the present invention which effects start of the motor upon actuation of any key, with an automatic timing device which effects stopping of the drive motor after a selected time, but is set back to initial position whenever a key is operated within such selected time.

Thereby, the drive motor of the typewriter will continuously run as long as the keys are actuated in a rapid sequence, but will be disconnected after a selected time period in which no key was actuated. In the event that it is desired to continue typing after a short delay which caused disconnection of the motor, the motor will be immediately started by actuation of the next key, and due to the arrangement of the present invention, the first imprint will be just as clear and legible as the last imprint before the interval.

It is also an object of the present invention to provide means for varying the time period after which the motor is automatically disconnected.

A further object of the present invention is to eliminate a separate motor switch in electric typewriters, and to assure aperfect operation of the typewriter by the average operator.

With these bje s i v sw. hev present n enti n main y consists in apparatus which comprises, in combination, motor means, operating means for a type leverof the typewriter and driven by the motor means, a set ofkeys, each key being movable to an interrne late position, and from there to an end position for initiating actuation of an associated type lever by the operating means, and means connecting the keys with the motor means for effecting start of the motor means upon movement of any one key to the intermediate position, Thus, overnent of an actuated key from the intermediate position for initiat; ing actuation of the associated type lever does nottake place to the end position until the motor means r1 51. operating means have reached a desired speed so that the type levers are actuated with a desired force,

Preferably, the apparatus includes a timing device for stopping the motor means after a selected time period, and resetting means for returning the timing device to initial position permitting continuous rnnning'of the 1110-. tor means. The resetting means are operatively connected to the keys, or to the type levers, so as to be oper-. ated to return the timing device to the initial position if a key is actuated within the selected time period.

In accordance with a preferred embodiment of the pres: ent invention, a control device is provided which is con: trolled by each of the keys upon movement of the same to the intermediate position to start the motor means, and is controlled by the started motor means to release blocking means, which block the keys in said intermediate position, a selected time period after the start of the motor means, so that the keys can only move to the end position in which the type levers are actuated after the motor means and operating means have reached a desired speed required for proper actuation of the first actuated type lever.

The timing device used in the preferred embodiment of the present invention includes a Geneva mechanism which is driven by the operating means of the typewriter to move to an operative position in which the motor switch is opened and the motor is stopped. However, movement of the Geneva mechanism to such operating position requires a certain time, and if during this time any type lever or key is actuated, the Geneva mechanism is set back to its initial position so that the motor runs continuously until the operation of keys is interrupted for a time period exceeding the operating time of the timing mechanism. v

In the preferred embodiment of the present invention, an electromagnetic means is provided for releasing the blocking means which block movement of the-keys in the intermediate position. The electromagnetic means is controlled by a control switch, and after the motor is started, it moves a control member for a short time period until the same closes the control switch of the electromagnetic means. Thereby, the blocking means which prevent actuation of type levers by the keys, are released about one tenth of a second after start of the motor and operating means for the type levers.

The motor switch is preferably connected in series with the control switch and electromagnetic means so that the electromagnetic means can under no circumstances be energized before the motor has been started,

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, howevenboth as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the tollowing description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a side view illustratingan apparatus accord:

ing to th pre ent invent on;

Fig. 2 is a fragmentary side view illustrating a part of the apparatus shown in Fig. 1 in a difierent operational position;

Fig. 3 is a fragmentary plan view illustrating a part of the apparatus shown in Fig. 1;

Fig. 4 is a fragmentary side view illustrating another part of the apparatus shown in Fig. 1;

Fig. 5 is a fragmentary side view illustrating a part of the apparatus shown in Fig. 1 in greater detail; and

Fig. 6 is a diagram illustrating the electrical circuit of the apparatus.

Referring now to the drawings, and more particularly to Figs. 1 and 2, a key 1 is shown to represent any key of a keyboard. A blocking bar 2a is provided which cooperates with a row of keys 1. As shown in Fig. 5 several blocking bars 2a, 2' and 2 are provided, each blocking bar cooperating with one row of keys 1. The blocking bar 2a is supported on lever means 2b which are pivotally connected at 2c to a lever 3 mounted on a pivot means 4. The free end of lever 3 is pivotally connected by a pin-slot connection to a link 6, which is pivotally connected to a latch lever 7 pivotally mounted on a pin 8. A spring 9 urges the latch lever 7 to turn in counterclockwise direction to engage the arm 16a of a control means and to lock arm 16a in the notch 7a.

Lever means 2b has a pin 2d which projects into a slot in an angular lever 12 which is pivotally mounted at 12a. Lever 12 has another slot engaging a pin 13a of an angular portion of an armature 13 which is part of an electromagnetic means 14.

When the armature 13 is attracted by the electromagnetic means 14, the above-described lever system moves to the position shown in Fig. l in which the latch lever 7 locks the arm 16a. However, a spring 10 connects pin 2d with lever 3 so that the levers 12 and 2a tend to assume an aligned position.

If the keys 1 are in their normal position, not shown in the drawing, the spring 9 turns the lever 7 into locking position, whereby the blocking bar 2a is raised to a position higher than the position in Fig. 2, which shows an intermediate position of the key 1.

When a key 1 is depressed from its normal position to the intermediate position shown in Fig. 2, the stop 5 limits turning movement of the lever 3 in a position in which the latch lever 7 releases the arm 16a. The stop 5 also blocks movement of the key 1 from the intermediate position to its end position, unless the armature 13 is attracted and moves the lever system 12, 2b into the position shown in Fig. 1 in which the key 1 is free to move to its end position. During such movement of any key 1 from the intermediate position to its end position, the type lever associated with the respective key is actuated in a known manner.

The above-mentioned arm 16a is a portion of a control member 16 which is mounted on four pins 116 for horizontal movement. Pins 116 project into slots of the control member 16. The control member 16 has another arm 16b, and is pivotally connected to a link 20 which is articulated to an angular lever 22 which operates a control switch 21. As shown in Fig. 6 control switch 21 is connected in series to the winding of the electromagnetic means 14. It will be noted that the control switch 21 is closed by the angular lever 22 when the control member 16 is in a position in which the latch lever 7 locks the arm 16a. The control member 16 is movable from such first position to a second position shifted to the left in Fig. l, and in the second position, the control switch 21 opens. A spring 19 urges the control member 16 to its second position, but such movement is only possible if the latch lever 7 releases the arm 16a as shown in Fig. 2.

An electrical motor means is provided which includes a-rnotor 50 shown in Fig. 6, and a motor switch 37 shown in Figs. 1 and 6. The motor 50 is connected in a known manner to an operating means or the type levers of the machine, such operating means being shown as a power roll 18. When the motor switch 37 is closed, the motor starts and rotates the operating means 18 so that upon actuation of any key 1, the respective type lever is operated by the operating means 18. This operation is known, and not an object of the present invention.

A member 17 is mounted on the control member 16 which cooperates with the operating means to form an eccentric drive. When the latch lever 7 releases the arm 16a of the control member 16, control member 16 moves to the left in Fig. 1 so that the member 17- engages the operating means 18. Turning of the operating means 18 will result in shifting of the control member 16 to the right as viewed in Fig. 1 until the control member 16 arrives again in its first position in which it can be locked by the latch lever 7.

The motor switch 37 is operated by a lever 36 which is pivotably mounted on a pin 36a for movement between two positions respectively engaging the stops 36b and 36c. A spring-loaded element 136 forms with lever 36 a toggle device. In the position illustrated in Fig. 1, the motor switch 37 is closed, and the lever 36 abuts 011 stop 36b. When the toggle member 136 is pivoted in clockwise direction by the arm 32a of a slotted member of a Geneva mechanism, the lever 36 will snap from the illustrated position to a position engaging the stop 360 after the levers 36 and 136 have passed through a dead center position. In such position, the motor switch 37 will be opened.

The slotted member 32 has slots 32b, and is turnably mounted on a pin 33. A spring 34 urges the slotted member 32 to turn in clockwise direction to the initial position in which the motor switch 37 is closed. The Geneva mechanism also includes a pin member consisting of a wheel 25 carrying a pin 29 which consecutively engages the slot 32b during turning of the wheel 25. A control disc 31 cooperates with the slotted segment portion of member 32 to arrest the slotted member while the pin 29 is not located in any one of the slots 32b.

The construction of the Geneva mechanism is also shown in the plan view of Fig. 3. From this figure it can be seen that the pin member 25, 29 is slidable in axial direction on the shaft 27 while being turnable with the same. A spring 26 urges the pin member into a position in which the pin 29 is located in the plane of the slotted member 32. A control lever 23 is pivoted on a pin 23a and has a projection 23b engaging the disc 25. When the control lever 23 is pivoted in counterclockwise direction as viewed in Fig. 3, the pin member 25, 29 is shifted to the right against the action of the spring 26 which abuts against a flange on the shaft 27. In this inoperative position of the pin member 25, 29, the pin 29 is located out of the plane of the slotted member 32, and consequently the pin 29 cannot turn the slotted member 32. More over, the spring will turn the slotted member to its initial position when the pin 29 releases the slots of the slotted member 32 in its inoperative position.

Consequently, whenever the lever 23 is actuated to move the pin member 25, 29 to the right in Fig. 3, the slotted member 32 will return to its initial position, so that when the pin member 25, 29 is again moved to its operative position, the slotted member 32 will start its turning movement until reaching its operative position engaging the stop 35 and forcing the toggle lever means 36, 136 into a position in which the motor switch 37 is open. it will be noted that the member 31 is fixedly connected to the disc 25 and moves with the same in A ratchet wheel 28 is fixedly connected to the shaft 27 on which the pin member 25, 29 is mounted. A pawl 43 cooperates with the ratchet wheel 28 to shift the same. Pawl 43 is mounted on a pivot pin 40a which also connects to levers 39 and 40. Lever 40 is connected by a pivotally mounted on a pivot pin 42a, and is provided with a series of recesses 42a which are engaged by a catch lever 46 under the action of a spring 45. A manually controlled member 47 is connected by a link 48 to the lever 42, so that the position of lever 42, and thereby the position of lever 41, and of pin 41a can be adjusted.

It is evident that rotation of the crank 39 will result in a reciprocating stroke of the pawl 43 in the position shown in Fig. 1. However, if the adjusting lever 42 is moved to the position shown in Fig. 4 in which the axis of the pin 41a coincides with the axis of the pin 40a, the pawl 43 will perform no stroke. Consequently by difierently spacing the pins 46a and 41a, the length of the stroke of the pawl 43 can be adjusted, and such adjustment of the variable transmission 39, 4t), 41, 42, 38 is obtained by shifting the lever 42 by lever 47. It is evident that the ratchet wheel, and thereby the pin member 25, 29 will turn faster if the stroke of the pawl 43 is longer, although the rotary speed of the operating means 18 is constant.

If the ratchet wheel 28 turns faster, the slotted member 32 will sooner arrive in its operative position in which the motor switch 37 is opened, and consequently the time period between closing motor switch 37 and opening the same can be adjusted by member 47. A scale indicating the time period of operation may be provided for member 47.

As explained above, the pin member 25, 29 is shifted to an inoperative position by the lever 23. Lever 23 is controlled by the arm 16b of the control member 16, and also by an arm 30 mounted on a shaft 24. Shaft 24 is controlled by the type levers, and is angularly displaced whenever the type lever is operated. Since the type levers are associated with the key 1, it is apparent that member 30 is operatively connected to the keys, and will perform an angular movement whenever a key is actuated. Lever 23 is also operated when the control member is shifted to the left in Fig. 1, since the arm 16b engages lever 23 as also shown in Fig. 3.

Regardless of whether member 1611 or member 30 shifts the angular lever 23, the pin member 25, 29 will be shifted in axial direction and release the slotted member 32 to return to its initial position under the action of spring 34.

The above-described mechanism operates in the following manner:

At the beginning of the operation, the motor switch 37 is open, the control member 16 is in its second position shown in Fig. 1, and the locking means 3, 6, 7 lock the control member 16 in its second position. However, the blocking means 2a, 12 are not in the position illustrated in Fig. l, but are aligned as shown in Fig. 2, while the blocking means 2a is located higher than in Fig. 2.

When the key 1 is depressed, it moves to the intermediate position shown in Fig. 2. The blocking means 2a moves to the position shown in Fig. 2 until the lever 3 engages the stop 5. In this position, the latch lever 7 of the locking means 7, 6, 3 has released the arm 16a of the control member 16. Further movement of the key 1 is not possible due to the fact that lever 2b is pivotally connected with lever 3 which is stopped by stop 5.

As soon as the latch lever 7 releases arm 16a, spring 19 pulls the control means 16, 17, 20 and 22 to the left in Fig. 1 to a second position in which the control switch 21 of the electromagnetic means 14 is opened.

The eccentric member 17 is also shifted into a position engaging the operating means 18. During movement of the control means to the left in Fig. 1, arm1l6b pivots the lever 23 so that the same pulls the pin member 25, 29 in axial direction into an inoperative position in which the pin 29 and the control element 31 release the slotted member 32 so that the same turns underv the action of spring 34 to its initial position efiecting closing of the motor switch through the toggle levers 36 and 136.

The motor switch 37 is now closed, and consequently motor 50 is started, as can be seen from Fig. 6. Motor 50 drives the operating means 18, and since the eccentric member 17 is now in engagement with the operating means 18, the control means 16, 20 are now shifted to the right as viewed in Fig. 1 to the second position in which the control switch 21 of the electromagnetic means 14 is closed.

As soon as the electromagnetic means 14 is energized, its armature 13 is attracted, and pivots the blocking lever system 12, 2b, 2a into the position shown in Fig. 1.so that the blocking bar 2a releases the key 1 which can continue its movement from its intermediate position to its end position. At the same time the latch lever 7 is operated by the blocking lever system 12, 2b to lock the control means in the second position.

Movement of any key 1 from the intermediate position to its end position will initiate actuation of the associated type lever by the operating means 18 by a means operating in a manner described, for example, in the US. Patents 2,287,475 and 2,489,826. A cam unit, not shown, is moved by keys 1 into frictional engagement with power roller 18 and is operatively connected to the type levers, not shown, to actuate the same. It will be understood that the key 1- cannot directly move to its end position for initiating actuation of the associated type lever, but that it is first necessary to shift the control means which is accomplished by the motor means driving the eccentric drive 18, 17. Consequently, a delay is produced between the start of the motor by closure of motor switch 37, and actuation of the type lever which can only be actuated after the started motor has shifted the control means to release the blocking means 2a.

The above-described operation results in a delay of one tenth of a second which is negligible for the operation of the first key, but assures that the motor and the operating means 18 have reached full speed before operating the first actuated type lever.

The armature 13 remains attracted, and the control switch 21 remains closed during the further operation of the typewriter so that the blocking means 2a are continuously held in an inoperative position as shown in Fig. 1. Due to the inoperative position of the blocking means 2a, no key moving from its normal position to the intermediate position can release the locking means 3, 6, 7. However, when the motor switch 37 is opened, the winding of the electromagnetic means 14 is disconnected as is apparent from Fig. 6, so that the armature 13 is released, and the spring 10 pulls the blocking lever system 12, 2b into an aligned position similar to the position of Fig. 2, but with the blocking means 2b and 2a slightly raised by the action of spring 9 which turns the latch lever 7 to locking position.

The operating means 18 turn continuously as long as the motor runs, and consequently the pin member 25, 29 is turned by the variable transmission 39, 40, 41, 42, 38, 43 and 28. Turning of the pin member 25, 28 will result in turning of the slotted segment member 32 until the toggle switch 37, 36, 136 is operated to open the contacts of switch 37. 1

Assuming that certain typed text has been completed, upon the last actuation of a key, the operating means 18 will turn until the Geneva mechanism has switched off the motor switch 37 which requires a certain time period during which the slotted wheel is turned from its initial position to its operative position in which the switch 37 is open.

If another key is operated in the position shown in Fig. 1 before the slotted member 32 has reached its operative position, the shaft 24 which is operatively connected to the type levers, and therefore also operatively connected to the keys, is turned through a small angle so that member 30 shifts lever 23 and the pin wheel 25, 29 in aXial direction until the pin 29, and the control element 31 release the slotted member 32 which is returned by spring 34 to its initial position in which the motor switch 37 is closed. The operating means will thereupon start operation of the Geneva mechanism from its initial position toward its operative position which requires a predetermined time, and whenever another key and type lever is actuated in such predetermined time period, the Geneva mechanism will be returned to its initial position so that the operation is continued until the last key has been actuated by the operator whereupon the motor switch is automatically opened, and the typewriter disconnected.

From the above description of the apparatus of the present invention, it will become apparent that the keys 1 are operatively connected to the motor means 50, 37 to effect starting of the motor 50 when any key is moved from its normal position to an intermediate position. Movement of the keys from the intermediate position to the end position in which the type lever is actuated, is delayed until the control means 16, have been shifted so that the motor and operating means are at full speed when the type lever actuation takes place.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of electric typewriters differing from the types described above.

While the invention has been illustrated and described as embodied in a delay mechanism for an electric typewriter which prevents actuation of a type lever before the motor and operating means of the machine have reached full speed, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In an electric typewriter, in combination, motor means; operating means for type levers and driven by said motor means; a set of keys, each key being movable to an intermediate position, and from there to an end position for initiating actuation of an associated type lever by said operating means; means connecting said keys with said motor means for effecting start of said motor means upon movement of any one key to said intermediate position; and means for delaying movement of an actuated key from said intermediate position to said end position until said motor means and operating means have reached a desired speed so that the type levers are actuated with a desired force.

2. In an electric typewriter, in combination, motor means; operating means for type levers and driven by said motor means; a set of keys, each key being movable to an intermediate position, and from there to an end position for initiating actuation of an associated type lever by said operating means; means connecting said keys with said motor means for eitecting start of said motor means upon movement of any one key to said intermediate position; means for delaying movement of an actuated key from said intermediate position to said end posmon until said motor means and operating means have reached a desired speed so that the type levers are actuated with a desired force; a timing device for stopping said motor means after a selected time period of operation of said notor means; and resetting means for returning said timing device to an initial position permitting continuous running of said motor means, said resetting means being opcratively connected to said keys so as to be operated to return said timing device to said initial position if a key is actuated within said selected time period.

3. in an electric typewriter, in combination, motor means; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking means for blocking movement of said keys from said intermediate position to said end position; and a control device controlled by each of said keys during movement of the same to said intermediate position to start said motor means, and being controlled by said started motor means to release said blocking means a selected time period after the start of said motor means.

4-. in an electric typewriter, in combination, motor means; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of the associated type lever by said operating means; blocking means for blocking movement or said keys from said intermediate position to said end position; control means shiftable between a first position for releasing said blocking means and a second position for starting said motor means, said control means being controlled by said keys to move to said second position upon movement of each key to said intermediate position for starting said motor means; and actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position a short time period after start of said motor means.

5. in an electric typewriter, in combination, motor means; operating means for type levers and driven by said motor means; a set of keys, each key being movabletl rough an intermediate position to an end position for initiating actuation of the associated type lever by said operating means;.blocking means for blocking movement of said keys from said intermediate position to said end position; control means shiftable between a first position for releasing said blocking means and a second position for starting said motor means, said control means being controlled by said keys to move to said second position upon movement of each key to said intermediate position for starting said motor means; actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position a short time period after start of said motor means; a timing device for stopping said motor means after a selected time period of operation of said motor means; and resetting means for returning said timing device to an initial position permitting continuous running of said motor means, said resetting means being operatively connected to said keys so as to be operated to return said timing device to said initial position if a key is actuated within said selected time period.

6. In an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking means for blocking movement of said keys from said.

intermediate position to said end position; control means shiftable between a first position and a second position and tending to assume said second position, said control means eflt'ecting in said second position closing of said motor switch, and efiecting in said first position release of said blocking means; locking means for locking said control means in said first position, said locking means being operated by each of said keys during movement to said intermediate position to release said control means so that upon actuation of a key said control means move to said second position for closing said motor switch and for starting said motor means and operating means; and actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position at a short time period after start of said motor means.

7. In an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking means for blocking movement of said keys from-said in termediate position to said end position; electromagnetic means for releasing said blocking means and including a control switch; control means shiftable between a first position and a second position and tending to assume said second position, said control means efiecting in said second position closing of said motor switch, and effecting in said first position closing of said control switch and actuation of said electromagnetic means so that said blocking means is released; locking means for locking said control means in said first position, said locking means being operated by each of said keys during movement to said intermediate position to release said control means so that upon actuation of a key said control means move to said second position for closing said motor switch and for starting said motor means and operating means; and actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position at a short time period after start of said motor means.

8. In an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys,

each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking meansfor blocking movement of said keys from said intermediate position to said end position; control means shiftable be tween a first position and a second position and tending to assume said second position, said control means effecting in said second position closing of said motor switch, and effecting in said first position release of said blocking means; locking means for locking said control means in said first position, said locking means being operated by each of said keys during movement to said interme diate position to release said control means so that upon actuation of a key said control means move to said second position for closing said motor switch and for starting said motor means and operating means; actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position at a short time period after start of said motor means; a timing mechanism driven by said motor means to move from an initial position to an operative position for opening said motor switch after a selected time period of operation of said motor whereby said motor is stopped; and resetting means for returning said timing mechanism to said initial position permitting continuous running of said motor means, said resetting means being operatively connected to said keys so as to -be-operated to return said timing mechanism to said 10 initial position if a key is actuated within said selected time period.

9. In an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking means for blocking movement of said keys from said intermediate position to said end position; electromagnetic means for releasing said blocking means and including a control switch; control means shiftable between a first position and a second position and tending to assume said second position, said control means effecting in said second position closing of said motor switch, and eflEecting in said first position closing of said control switch and' actuation of said electromagnetic means so that said blocking means is released; locking means for locking said control means in said first position, said locking means being operated by each of said keys during movement to said intermediate position to release said control means so that upon actuation of a key said control means move to said second position for closing said motor switch and for starting said motor means and operating means; actuating means driven by said motor means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position at a short time period after start of said motor means; a timing mechanism driven by said motor means to move from an initial position to an operative position for opening said motor switch after a selected time period of operation of said motor whereby said motor is stopped; and resetting means for returning said timing mechanism to said initial position permitting continuous running of said motor means, said resetting means being operatively connected to said keys so as to be operated to return said timing mechanism to said initial position if a key is actuated within said selected time period.

10. An apparatus as set forth in claim 9 wherein said timing mechanismis a Geneva mechanism including a slotted member turnable between said initial and operative positions, and a turnable pin member cooperating with said slotted member and being driven from said operating means.

11. An apparatus as set forth in claim 9 wherein said timing mechanism is a Geneva mechanism including a slotted member turnable between said initial and operative positions, and a turnable pin member cooperating with said slotted member, adjustable transmission means connecting said turnable pin member with said operating means so that said turnable pin member is driven by said operating means, said adjustable transmission means varying the turning speed of said turnable pin member and thereby varying said selected time period.

12. An apparatus as set forth in claim 11 wherein said adjustable transmission means includes a ratchet wheel connected to said turnable pin member for rotation therewith; a pawl for turning said ratchet wheel; an articulated linkage supporting said pawl and including a plurality of pivotally connected levers and an eccentric member driven by said operating means so that articulated linkage performs a reciprocating stroke; adjusting means for adjusting the relative position of said levers for adjusting the stroke of said pawl; and means for holding said adjusting means in a plurality of positions in which said pawl performs strokes of difierent length and turnssaid turnable pin member at diiferent turning speeds.

13. In an electric typewriter, in combination, moto'r means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; blocking means for blocking movement of said keys from said intermedia illl ate position to said end position; electromagnetic means for releasing said blocking means, said electromagnetic means including a control switch; control means shiftable between a first position and a second position and tending to assume said second position; locking means for locking said control means and being operated by said electromagnetic means, said control means effecting in said second position closing of said motor switch, and effecting in said first position closing of said control switch and actuation of said electromagnetic means so that said blocking means is released and said lock g means locks said control means in said first position, said locking means being operated by each of said keys during movement to said intermediate position to release said control means so that upon actuation of a key said control means move to said second position for closing said motor switch and for starting said motor means and operating means; and actuating means driven by said moto'r means for returning said control means to said first position whereby said blocking means is released to permit movement of said key to said end position at a short time period after start of said motor means.

14. in an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; electromagnetic means including a control switch, said electromagnetic mcans including a movable armature; blocking lever means for blocking movement of said keys from said intermediate position to said end position and being connected to said armature to move to a releasing position when said electromagnetic means is energized; control means shittable between a first position for closing said control switch and a second position for closing said motor switch; spring means urging said control means into said second position; locking means including latch means for locking said control means in said first position. said latch means being mounted on said blocking lever means, said latch means being operated by said keys to release said control means upon movement of each of said keys to said intermediate position so that said control means move to said second position for closing said motor switch and starting said motor means and operating means; and actuating means driven by said motor means for returning said control means to said first position whereby said control switch is closed, and said electromagnetic means is energized and shifts said blocking lever means to said releasing position, said blocking lever means shifting simultaneously said latch means into a position locking said control means in said first position.

15. An apparatus as set forth in claim 14 wherein said motor means includes a motor connected in parallel with said electromagnetic means, said moto'r switch being connected in series with said motor on one hand, and with said electromagnetic means including said control switch on the other hand.

16. In an elect ic typewriter, in combination, motor means including a motor switch: operating means for type levers and driven by said motor means; a set of keys, each key being movable through an intermediate position to an end position for initiating actuation of an associated type lever by said operating means; electromagnetic means including a control switch, said electromagnetic means including a movable armature; blocking lever means for blocking movement of said keys from said intermediate position to said end position and being connected to said armature to move to a releasing position when said electromagnetic means is energized; control means shiftable between a first position for closing said control switch and a second position for closing said moto'rswitch; spring means urging said control means into said second position; locking means including latch means for locking said control means in said first position, said latch means being mounted on said blocking lever means, said latch means being operated by said keys to release said control means upo'n movement of each of said keys to said intermediate position so that said control means move to said second position for closing said motor switch and starting said motor means and operating means; actuating means driven by said motor means for returning said control means to said first position whereby said control switch is closed, and said electro tgnetic means is energized and shifts said blocking lever means to said releasing position, said blocking lever means shifting simultaneously said latch means into a position locking said control means in said first position; ming mechanism driven by said motor means to move frc n 71 initial position to an operative position for opening said motor switch after a selected time period of operation of said motor whereby said motor is stopped; and resetting means for returning said timing mechanism to said initial position permitting continuous running of said motor means, said resetting means being operatively connected to said keys so as to be operated to return said timing mechanism to said initial position if a key is actuated within said selected time period.

17. An apparatus as set forth in claim 16 wherein said timing mechanism is at Geneva mechanism including a slotted member turnable between said initial and operative positions, and closing said motor switch in said initial position and opening the same in said operative position, a turnable pin member driven by said operating means and axially shiftable between a first position cooperating with said siotted member and a second inoperative position spaced from said slotted member, spring means urging said pin member into said first position, and other spring means connected to said slotted memher for turning the same to said initial position when said pin member is in said second inoperative position; and wherein said resetting means include a member for shifting said tnrnable pin member from said first position to said second inoperative position, and adapted to be controlled by each type lever to eifect return of said slotted member to said initial position upon actuation of a key and associated type lever; said control means including another member for operating said member upon movement of said control means to said second position so that said slotted member turns to said initial position and closes said motor switch in said second position of said control means.

18. in an electric typewriter, in combination, motor means including a motor switch; operating means for type levers and driven by said motor means; a set of keys, each key being movable to an intermediate position, and from there to an end position for initiating actuation of an associated type lever by said operating means; electromagnetic means including a control switch and a movable armature; control means shiftable between a first posi tion for closing said control switch and a second position for closing said motor switch and starting said motor means; spring means urging said control means into said second position; latch means for locking said control means in said first position, said latch means being operated by each of said keys to release said control means during movement of said key to said intermediate position; a movable lever system connected to said armature operated by the same, said movable lever system including a lever connected to said latch means for moving said latch means to a iocking position locking said control means in said first position when said armature is operated upon closure of said control switch; and actuating means driven by said motor means for returning said control means to said first position whereby said control switch is closed and said electromagnetic means operates said latch means to lock said control means ,in said first position. i

Geneva mechanism including a slotted member turnable between an initial position and an operative position, and opening said mo'tor switch in said operative position and closing said motor switch in said initial position, a turnable pin member driven by said operating means and being axially shiftable between a first position cooperating with said slotted member and a second inoperative position spaced from said slotted member, spring means urging said pin member to move to said first position, and other spring means connected to said slotted member for turning the same to said initial position when said pin member is in said second inoperative position; a member operatively connected to each of said keys and adapted to be controlled upon operation of the type levers by said keys to effect movement of said pin member to said second inoperative position whereby said slotted member is released by said pin member and returns to said initial position in which said motor switch is closed; said control means including another member for moving said pin member to said second inoperative position when said control means move to said second position whereby said motor switch is closed in said second posi tion of said control means; latch means for locking said control means in said first position, said latch means being operated by each of said keys to release said control means during movement of said key to said intermediate position; a movable lever system connected to said armature and operated by the same, said movable lever system including a lever connected to said latch means for moving said latch means to a locking position locking said control means in said first position when said armature is operated upon closure of said control switch; and actuating means driven by said motor means for returning said control means to said first position whereby said control switch is closed and said electromagnetic 14 means operates said latch means to lock said control means in said first position.

20. An apparatus as set forth in claim 19 wherein said movable lever system which is operated by said armature includes a blocking member for blocking said keys in said intermediate position, said blocking member releasing said keys when said armature operates said movable lever system upon closing of said control switch by said control means.

21. Ina device of the type described, in combination, moto'r means; operating means for type means and being driven by said motor means; at least one manually operated member movable to an intermediate position, and

from there to an end position; first means connecting said manually operated member with said motor means for effecting start of said motor means upon movement of said manually operated member toward said intermediate position; and second means operable by said manually operated member for initiating actuation of the associated type means by said operating means during movement of said manually operated member from said intermediate position to said end position so that said motor means and operating means have a desired speed when said manually operated member reaches said end position.

22. In a device of the type described, in combination, motor means; operating means for type means and being driven by said motor means; at least one manually operated member movable to an intermediate position, and from there to an end position; first means connecting said manually operated member with said motor means for efiecting start of said motor means upon movement of said manually operated member toward said intermediate position; second means operable by said manually operated member for initiating actuation of the associated type means by said operating means during movement of said manually operated member from said intermediate position to said end position; and means for delaying movement of said manually operated member from said intermediate position to said end position until said motor means and operating means have a desired speed.

Degener May 1, 1928 Hokanson Aug. 8, 1933

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