US3295653A - Interlocking device for electric typewriters - Google Patents

Interlocking device for electric typewriters Download PDF

Info

Publication number
US3295653A
US3295653A US532026A US53202666A US3295653A US 3295653 A US3295653 A US 3295653A US 532026 A US532026 A US 532026A US 53202666 A US53202666 A US 53202666A US 3295653 A US3295653 A US 3295653A
Authority
US
United States
Prior art keywords
bail
operated
case
lever
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US532026A
Other languages
English (en)
Inventor
Salto Rinaldo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olivetti SpA
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CH182064A priority Critical patent/CH400201A/it
Application filed by Individual filed Critical Individual
Priority to US532026A priority patent/US3295653A/en
Application granted granted Critical
Publication of US3295653A publication Critical patent/US3295653A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/54—Locking devices applied to printing mechanisms
    • B41J29/58—Locking devices applied to printing mechanisms and automatically actuated
    • B41J29/70—Interlocks between any two-carriage-moving mechanisms, e.g. character-space, back space, tabulation, carriage return or carriage- release mechanisms

Definitions

  • the invention relates to electric typewriters in general, such as for example embodying a set of typebars pivotally mounted on a basket, 2. set of operating actions therefor which are individually conditionable for operating said typebars selectively, a paper carriage, and mechanism conditionable for relatively displacing said basket and said carriage. More particularly, the invention relates to an interlocking device for said type actions and mechanism, whereby operations thereof are enforced to occur appropriately spaced in time to facilitate good typed results.
  • the type actions may be operated during a relative displacement of the basket with respect to the paper carriage, for example during the case shifting of the basket, or the spacing of the carriage, controlled by related controls or keys, whereby imprints are liable to be effected in incorrect locations on the work sheet.
  • the primary object of the invention is to provide an interlocking device between the type actions and other mechanisms of the machine which is simple, eflicient and reliable in operation and allows a maximum of freedom for key operations.
  • Another object is to provide efficiently operating interlocking devices between the type actions and other keycontrolled mechanisms without locking the keys for the control of said type actions and said mechanism against operation.
  • a further object is to provide an efficiently operative interlocking device between a power-operation control mechanism for the type actions and a power-operation control mechanism for a spacing device which is nonobstructive to the control keys for such mechanisms.
  • an interlocking device between operation-control mechanism for type actions and operation-control mechanisms for carrying out other functions, comprising in combination, a universal member which responsively to the depression of any printing key is impositively urged toward an operated position for conditioning the corresponding one of said type actions, a first element movably associated with said universal member for urged movement thereby along a first path, and a second element which responsively to a function key is impositively urged along a second path, the paths of said elements being intersecting each other so that each one of said two elements when moved along its path is adapted to block or intercept the other element against operation.
  • FIG. 1 is a right-hand partial longitudinal sectional view of an electric typewriter embodying an interlocking device according to the invention
  • FIG. 2 is a right-hand longitudinal sectional view of a first embodiment of the interlocking device according to the invention in the typewriter of FIG. 1;
  • FIG. 3 is a detail of FIG. 2 in an operated position
  • FIG. 4 is a right-hand longitudinal sectional view of a second embodiment of the interlocking device according to the invention in the typewriter of FIG. 1.
  • the interlocking device according to the invention is embodied in an electric typewriter of the kind described in the applicants United States patent application, Serial No. 311,709, now Patent No. 3,151,722 dated October 6, 1964, which will be now briefly described.
  • the typewriter comprises a set of printing keys 30 (FIG. 1), a set of typebars 7 pivotally mounted on a body or basket 9, and individual operating actions 12, 11, which are individually conditionable for operating said typebars 7.
  • a corresponding key lever 31 through a trip lever 28 releases a corresponding enabling element or interponent 19, which then is rocked impositively counterclockwise by the urge of a suitable spring 26.
  • the enabling element 19, on one hand, is urged to become coupled with a common actuator or bar 33 to condition the corresponding type action 12, 11 for operation, and further is urged to rock a universal member or bar 46 counterclockwise.
  • the cam 43 releases a lever 39 which is connected to the bar 33 through a link 38, whereby the bar 33 becomes suddenly power-rocked counterclockwise by a spring 37.
  • the bar 33 draws now the coupled enabling element 19 forwards (leftwards in FIG. 1), whereby the corresponding operating action 12, 11 rocks the typebar 7 clockwise to effect an impression against a conventional platen 6.
  • the cam 94 engages and rocks the lever 58 clockwise to release the arm 56 and render the bail 53 restorable.
  • the cam 71 rocks counterclockwise a lever 72 fulcrumed at '73.
  • the lever 72 is connected by a link 76 to a lever 77 fulcrumed at 78, which is thus rocked in synchronism with the lever 72.
  • Said lever 72 when rocked, is resiliently followed by a lever 89 fulcrumed at 73.
  • the lever 89 causes a lug 91 to engage another arm 92 of the bail 53. This returns the latter to its first, normal position and in turn returns the bar 46 to its normal FIG. 1 position.
  • the lever 72 through an arm 180, when operated, engages a lug 181 of a bail 182. pivoted at 183.
  • another arm 184 of the bail 182 operates a stepfeeding device in the form of an escapernent mechanism generically indicated by the numeral 121), which cooperates in a known manner with a rack 121 secured to a conventional paper carriage 122.
  • Said carriage embodies a usual platen 6 and is spring-urged leftwards in a conventional manner. Therefore, the escapement mechanism 128 may be stated to be operable by a power-mechanism for relatively displacing the body 9 and the carriage 122.
  • the escapement mechanism 120 when operated causes the carriage 122 to be step-fed by the usual carriage feed spring, but due to the inertia of the carriage, the step-feed motion takes place only after the bail 53 upon momentary power operation becomes restored.
  • Each typebar 7 is provided with a lower case type 138 and an upper case type 129 and the types of either shift case are selectable for potential printing coaction with the platen by means of a conventional case shift mechanism generically indicated by the numeral 123.
  • a conventional case shift mechanism generically indicated by the numeral 123.
  • the ease shift mechanism 123 represents a mechanism conditionable for relatively displacing the basket 9 or type system in respect to the carriage 122.
  • the basket 9 is provided with a pair of projections 131 of which the left projection only is shown in FIG. 1.
  • Each projection 131 is provided with a slot 132 slidable on a stationary guide pin 133.
  • the basket 9 is provided with another projection 128 connected at 127 to a bail 124 fulcrumed on a stationary shaft 126.
  • An arm 134 (FIG. 2) of the bail 124 is pin-and-slot connected to a lever 136 pivoted at 137.
  • the lever 136 cooperates with a case-shift cam 138 rotatably mounted on the motor-driven shaft 76 and adapted to be rotated thereby for a cycle of 180 degrees by closure of a clutch having a pair of rest locations associated with the upper and the lower case of the basket 9.
  • said clutch comprises a dog 139 pivoted at 141 on the case shift cam 138, and a toothed wheel 142 secured to the shaft 78.
  • the dog 139 is further provided with a cam slot 143 engaging a pin 144 of a control plate 146 rotatably mounted on the shaft 78.
  • a spring 147 connecting the dog 139 and the plate 146 normally urges the plate counterclockwise on the cam 138, and therefore tends to engage the dog 139 with the wheel 142.
  • a control member for the control plate 146 is yieldably movable counterclockwise from a first to a second p sition, and is in the form of a bail 151 pivoted on a stationary shaft 152.
  • the bail 151 is provided with a first arm 149 having a lug 148, which in the first position of the bail shown in FIGS. 2 and 3 is adapted to open the clutch 139, 142 disengaged through arresting either one of a pair of diametrally opposite projections 153 and 154 on the control plate 146.
  • the basket 9 is in its raised lower case position and the lug 1 48 arrests the projection 152, as shown in FIG. 2.
  • a spring 163 connecting the lever 136 and the bail 151 urges the lever 136 to contact the cam 138, and on the other hand urges the bail 151 to contact its lug 148 with the ends of either one of two levers 164 and 165 which are independently fulcrumed on a common pivot 166.
  • the levers 164 and 165 are urged by a spring 167 toward each other and are adapted to latch alternately the control member 151 upon movement to its first position (FIGS. 2 and 3).
  • the two levers 164 and 165 are provided respectively with a pin 172, and a pin 173, which are adapted to be engaged by a nose 1'75 of a lever 174 respectively through operation and restoration of a case shift lever 177 bearing a key 178.
  • lever 177 is pivoted at 176 and has a pin-and-slot connection with the lever 177.
  • Said shiftable means comprise a pin 168 secured to a lever 169 which is fulcrumed on the shaft 152 and is normally urged by a spring 171 to contact the case-shift cam 138.
  • the bail 151 is provided with a second arm 156 adapted to be engaged by either of a pair of pins 157 and 158 which are secured to the cam 138 at diametrally opposite positions for returning the bail 151 transitorily to its first position each time the cam 138 nears the end of the half return shifting operation.
  • Integral with the bail 53 which becomes operated in each instance as any one of the type-action enabling elements '19 moves the bail 46, is a first element or lug 162 having a right hand intercepting face and a lower abutting edge movable along a first path.
  • the case shift mechanism operates as follows.
  • the dog 139 is now rotated counterclockwise together with the cam 138 and the plate 146.
  • the cam 138 by means of the lever 136 rocks the bail 124 counterclockwise, whereby the bail 124 shifts the basket 9 (PEG. 1) downwards to the upper case position.
  • the cam 138 (FIG. 2) causes the lever 169 to be rocked clockwise by the spring 171, and the pin 168 is brought to contact the rocked lever 164.
  • the lever 165 is now urged counterclockwise by the spring 1167, but it is temporarily arrested by the lug 148.
  • the pin 157 of the cam 138 engages the arm 156 and returns the bail 151 positively to its first position.
  • the bail 151 thus brings its projection 161 out of the path of the lug 162.
  • the lug 148 of the bail 151 releases the lever 165 which is suddenly brought to the position of FIG. 3 to lock the lug 148 again in its first position.
  • the lug 148 arrests the projection 154 of the plate 146, whereby the clutch 139, 142 is disengaged and the case shift basket or body 9 now IfiS in upper case lowered position.
  • the cam 138 is now further rotated through 180 degrees from the position of FIG. 3 to the position of FIG.- 2, and causes the lever 136 to be rocked counterclockwise.
  • the lever 136 by means of the bail 124 now shifts the basket 9 upwards to its lower case position.
  • the earn 138 rocks the lever 169 counterclockwise, whereby the pin 168 contacts the lever 165 to move it and hold it in the position shown in FIG. 2, while the lever 164 descends idly to overlie temporarily the lug 148.
  • the pin 158 of the cam 138 transitorily acts on the arm 156 'of the bail 151 to cause the end of the lever 164 to become held by the lug 148 as shown in FIG. 2.
  • the projection 161 stands now out of the path of the lug 162, while the lug 148 is in position to arrest the plate 146 by its projection 153 in the position of FIG. 2, thereby to open the clutch 139, 142.
  • the bail 53 becomes rocked by the spring 26 of the released interponent 19, only when the bail 151 (FIG. 2) becomes automatically restored clockwise by either the pin 157 or 158, that is at the end of the operation of the case shift mechanism.
  • the operation of the corresponding type action is thus delayed until the basket 9 reaches either the upper case or the lowercase position, but the type key is not affected by said delay.
  • each one of the two elements constituted by the lug 162 of the bail 53 and the projection 161 of the bail 151, when moved out of their rest position is adapted, for the duration of its operation, to block the other element against operation but the keys to which said elements may respond are free to be operated.
  • the escapement mechanism 120 (FIG. 1) for the carriage 122 may be conditioned for operation independently of the lever 72, at the depression of a conventional space bar 185 (FIG. 4).
  • the bar 185 is secured to a lever 186 which is pivoted at 187 and is pin-and-slot connected to a lever 188, which is pivoted on a stationary shaft 189.
  • the lever 188 is normally contacted by a pin 194 of another lever 195 pivoted on the shaft 189 and connected to the lever 188 by a spring 196.
  • the lower end of the lever 188 is normally contacted by a lug 190 of a control member or bail 191 which is fulcrumed at 192 and urged clockwise by a spring 193.
  • the bail 191 is provided with a projection 202 normally arresting any one of three llllgS 203 of a clutch controlling ring 204.
  • the latter is connected by two levers 208 and a dog 209 to a cam 205 rotatably mounted on the shaft 70.
  • a spring 211 urges the ring 204 counterclockwise and the dog 209 tends to engage a toothed wheel 210 secured to the shaft 70.
  • a bail 212 pivoted on the shaft 73 is normally urged by a spring 213 to contact the earn 205 and is provided with an arm 214 adapted to engage the lug 181 of the bail 182 (FIG. 1) for operating the escapement mechanism similarly as: the arm of the lever '72 is capable to operate it.
  • the bail 191 is further provided with an arm 215 adapted to cooperate with a cam 216, which is bodily rotatable with the cam 205.
  • a cam 216 Integral with the bail 53 is a first element or projection 221 having a left hand intercepting edge and a lower abutting edge movable along a first path.
  • a second element comprising a lug 219 is integral with an arm 218 of the bail 191 and has an upper intercepting face and a right hand abutting edge movable along a second path intersecting said first path.
  • fulcrumed on the shaft 189 is a bail 198 having an arm 199 pin-and-slot connected to the lever 77 and another arm 197, which is adapted to cooperate with the lug of the bail 191.
  • the lever 186 rocks the lever 188 clockwise and releases the lug 190 of the bail 191, while the lever is urged by the spring 196 to contact the lug 190.
  • the spring 193 rocks the bail 191 yieldably clockwise and places its lug 219 into the path of the projection 221 of the bail 53.
  • the bail 191 in being rocked moves the projection 202 toward the lug 203 of the ring 204, whereby the spring 211 causes the dog 209 to engage the wheel 210, and the cams 205 and 216 are responsively rotated counterclockwise for a cycle of 120 degrees.
  • the cam 205 rocks the bail 212 counterclockwise, whereby the arm 214 engages the lug 181 and operates the escapement mechanism 120 (FIG. 1) to step-feed the carriage 122.
  • the cam 216 (FIG. 4) operates the arm 215 to rock the bail 191 counterclockwise, thus returning the lug 219 out of the path of the projection 221, and, furthermore, moving the projection 202 to intercept the clutch-controlling ring 204 by one of its lugs 203 to cause the clutch 209, 210 to open. If at that time the operator has released the space key 185, then the lever 188 will assume its normal FIGURE 4 position. Should the operator prolon'gedly hold the space key operated, the lever 195 springs into a position to overlie the lug 190 to temporarily lock the bail 191 in its restored position pen-ding the release of the space key, thereby to prevent repeat spacing cycles.
  • the bail 53 is returned at the end of the printing stroke of the type action, by the counterclockwise rotation of the lever 72 which is substantially before the spacing step of the carriage accompanying a typing operation can occur, through the lever 180 which is power actuated by the cyclic cam 71 associated with the typing mechanism. It will thus be seen that so far as the projection 22 (FIG. 4) on the bail 53 is concerned it would allow a too early release of the bail 191 by the space key 185 to institute a carriage escapement operation through cycling action of the space actuating cam 205. Obviously, it is desirable to suppress the cycling action of the space operating cam 205 until the carriage incidental to a typing operation has executed its step.
  • the bail 198 is provided, which through counterclockwise actuation of the lever 77, by the lever 72 (FIG. 1) and the link '76 becomes rocked and places the arm 1%7 (FIG. 4) of said bail 198 into the path of the lug 9 of the bail 190, thus holding it.
  • cam 71 associated with the typing mechanism concludes its cyclic advance and the lever 72 restores, the arm 197 moves from over the lug 190. In this manner, it is made certain that the space key 185 cannot trip the bail 191 to operated position while the carriage takes a step as a result of a typing operation.
  • the universal member 46 becomes impositively urged toward operated position, that responsively to the depression or release of the case shift key 178 the member 151 becomes impositively urged toward op erated position, and that responsively to the depression of the space key 185 the member 191 becomes impositive 1y urged toward an operated position.
  • the members 46 and 151 only one at a time can move to operated position, and this applied in respect to the members 46 and 191.
  • the members 46 and 151 means controlled by these said members and cooperative therebetween is provided so that always that one of such member which precedingly to the other becomes urged toward operated position causes instantly and for the duration of its automatically trimed interval of operation, the blocking of the other member against operation. If the member 46 is operated there will be a power typing operation. If the member 151 is operated there will be a power case-shift-operation from lower case to upper case, or vice versa, depending on whether the case shift key was operated or released. In the course of such power operation, Whether it be a power typing or a power case shifting operation, the member 46 or 151, whichever was operated, will be automatically restored after the given time interval of operation.
  • the blocking ceases when the operated member restores and the other member will automatically become operated, if it is then under urge to do so. From this it follows that the operations of the type keys 30 in reference to the operation or the restoration of the case shift key 178 need not be carefully spaced in time to assure non-conflicting operations of the mechanisms controlled thereby. Moreover, there is no interference between depressions of the keys 30 and 178.
  • the member 191 preferably should be blocked beyond the time which the universal member 46 is restored. This is accomplished by means including the bail 198, which is controlled by the power means for effecting power typing operations, to render the member 191 for a while blocked against operation each time the universal member 46 is restored in the course of a typing operation.
  • an electric typewriter having a set of type levers pivotally mounted on a basket, a set of type actions individually conditionable for operating the corresponding one of said type levers, a paper carriage, a depressible case shift key, and a mechanism operable for case shifting said basket with respect to said carriage between a upper case and a lower case thereof, and interlocking device for said type actions and said mechanism, comprising in combination:
  • each one of said two elements when located in the corresponding second position placing the intercepting portion into the path of the abutting portion of the other element to lock said other element.
  • a power operated typewriter comprising a system of individually operable typebars, a typebar supporting body, a platen, individually operating actions for said typebars, and a power mechanism adapted to be called into operation to effect a relative displacement between said body and said platen:
  • a power operated typewriter having a system of individually operable type bars a supporting body for said type bars, a platen, operating actions for said type bars, and a power mechanism operable for effecting a relative ease shift displacement between said body and said platen,
  • a power operated typewriter having a system of individually operable typebars, a supporting body for said typebars, a platen, operating actions for said typebars, and a mechanism operable for elfecting a relative ease shift displacement between said body and said platen,
  • a power-operated typewriter having a system of individually operable typebars, a supporting body for said typebars, a platen, operating actions for said typebars, power means to operate said actions and power case-shift means capable alternately of operation to shift said body relatively to said platen to occupy in respect thereto alternately one or another of two case shift positions:
  • control means selectively operable to urge selective movements of said elements
  • (k) means to operate said stepfeeding device automatically by operation of said first power means each time after it has effected a movement of a type against said platen
  • a power-operated typewriter having a system of typebars, operating actions individual to said type-bars, a platen, means movably correlating said system of type-bars and said platen for relative step- 13 feed travel, and a device operable to cause relative stepfeed between said system of typebars and said platen;
  • ( h) means to render said universal member after such instance of its operation, automatically restored to its normal position after a timed interval of operation in which said power means has become selectively operative
  • a power operated typewriter comprising a system of typebars, operating actions individual to said typebars, a platen, means correlating said system of typebars and said platen for relative letter-feed travel, a device operable for relatively letter-feeding said platen in respect to the system of typebars, and means to operate said device in accompaniment with each typebar operation,
  • (d) means to restore said universal member automatically after a timed interval of operation and thereby adapted to restore any previously released selective element to its latch
  • (j) means responsive to the movement of said other member to operated position to render said other power means efiective first to operate said spacing 3,295,653 l5 l6 device and then adapted after a timed interval to References Cited by the Examiner restore automatically the other member to its latch, (k) and means controlled by said two members and UNITED STATES PATENTS cooperative therebetween so that always that one of 1 703 0 4 19 Kaemmel 197 17 X of such members which precedingly to the other be- 5 44339 1 3 n 197 112 comes urged toward ope-rated position causes in- 3,151,722 10/1964 Salto 197 17 stantly and for the duration of its automatically timed interval of operation, the blocking of the other ROBERT E, PULFREY, Primary Examiner. member against operation, whereby when either of said members becomes automatically restored, the 10 BURR, Assistant Examinerother will become operated if it is under urge to do so.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
US532026A 1963-02-21 1966-01-13 Interlocking device for electric typewriters Expired - Lifetime US3295653A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH182064A CH400201A (it) 1963-02-21 1964-02-17 Dispositivo di bloccaggio reciproco per una macchina per scrivere elettrica
US532026A US3295653A (en) 1963-02-21 1966-01-13 Interlocking device for electric typewriters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT374163 1963-02-21
US532026A US3295653A (en) 1963-02-21 1966-01-13 Interlocking device for electric typewriters

Publications (1)

Publication Number Publication Date
US3295653A true US3295653A (en) 1967-01-03

Family

ID=27624486

Family Applications (1)

Application Number Title Priority Date Filing Date
US532026A Expired - Lifetime US3295653A (en) 1963-02-21 1966-01-13 Interlocking device for electric typewriters

Country Status (2)

Country Link
US (1) US3295653A (it)
CH (1) CH400201A (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568811A (en) * 1968-09-20 1971-03-09 Litton Business Systems Inc Memory system for an electric typewriter
US3664478A (en) * 1969-09-16 1972-05-23 Olivetti & Co Spa Mutual locking device for an office machine with electric keyboard
US3669236A (en) * 1970-02-09 1972-06-13 Varityper Corp Keyboard for a printing machine
US3698530A (en) * 1968-08-30 1972-10-17 Olympia Werke Ag Case shift control apparatus operable by a case shift key and by type keys
US3732964A (en) * 1970-08-27 1973-05-15 T Inoue Electric typewriter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708066A (en) * 1924-05-14 1929-04-09 Mercedes Buro Maschinen Werke Means of shifting the platen or the like in typewriters
US1944889A (en) * 1933-05-23 1934-01-30 Edwin S Hall Typewriter line stop
US3151722A (en) * 1962-09-28 1964-10-06 Olivetti & Co Spa Spring actuated typewriter action with fault sensing means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708066A (en) * 1924-05-14 1929-04-09 Mercedes Buro Maschinen Werke Means of shifting the platen or the like in typewriters
US1944889A (en) * 1933-05-23 1934-01-30 Edwin S Hall Typewriter line stop
US3151722A (en) * 1962-09-28 1964-10-06 Olivetti & Co Spa Spring actuated typewriter action with fault sensing means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698530A (en) * 1968-08-30 1972-10-17 Olympia Werke Ag Case shift control apparatus operable by a case shift key and by type keys
US3568811A (en) * 1968-09-20 1971-03-09 Litton Business Systems Inc Memory system for an electric typewriter
US3664478A (en) * 1969-09-16 1972-05-23 Olivetti & Co Spa Mutual locking device for an office machine with electric keyboard
US3669236A (en) * 1970-02-09 1972-06-13 Varityper Corp Keyboard for a printing machine
US3732964A (en) * 1970-08-27 1973-05-15 T Inoue Electric typewriter

Also Published As

Publication number Publication date
CH400201A (it) 1965-10-15

Similar Documents

Publication Publication Date Title
US3151722A (en) Spring actuated typewriter action with fault sensing means
US3295653A (en) Interlocking device for electric typewriters
US3021937A (en) Selective interlock mechanism
US3288262A (en) Variable spacing mechanism for typewriters and like machines
US2362229A (en) Typewriting machine
US2905303A (en) Escapement pawl control
US3311211A (en) Keyboard sequence discriminator with different codes for upper and lower case
US2945578A (en) Variable spacing mechanism for typewriters
US2896765A (en) Trip pawl control mechanism
US3338368A (en) Function operating device for an electric typewriter
US2315992A (en) Typewriting machine
US2164422A (en) Typewriting machine
US2633966A (en) Operation control interlocking mechanism for typewriters or like machines
US3814228A (en) Repeat mechanism for a printer
US2984328A (en) Carriage positioning mechanism for typewriters or like machines
US2590777A (en) Case shifting mechanism and repeat typing mechanism for power-operated typewriters and like machines
US2216627A (en) Combined typewriting and computing
US2580318A (en) Power operated tabulating mechanism for typewriting machines
US2359062A (en) Typewriting machine
US1440118A (en) Typewriting machine
US3339695A (en) Repeat mechanism for printing device
US1389718A (en) Typewriting-machine
US1061639A (en) Type-writing machine.
US2441375A (en) Key locking device for power operated typewriting machines
US3349884A (en) Fault sensing device for a springactuated typewriter