US2966249A - Parallel key action for typewriters - Google Patents

Parallel key action for typewriters Download PDF

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Publication number
US2966249A
US2966249A US810736A US81073659A US2966249A US 2966249 A US2966249 A US 2966249A US 810736 A US810736 A US 810736A US 81073659 A US81073659 A US 81073659A US 2966249 A US2966249 A US 2966249A
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US
United States
Prior art keywords
stop
key
bell crank
link
trip
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
US810736A
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English (en)
Inventor
Evert G Israelson
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.)
Unisys Corp
Original Assignee
Sperry Rand Corp
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
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US810736A priority Critical patent/US2966249A/en
Application granted granted Critical
Publication of US2966249A publication Critical patent/US2966249A/en
Priority to BE598962A priority patent/BE598962A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • B41J5/26—Regulating touch, key dip or stroke, or the like
    • 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
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • B41J5/14—Construction of key levers

Definitions

  • An object of the invention is to provide a typewriter key lever parallel action for use in connection with the power mechanism of a typewriter that will furnish a uniform key clip for all key lever positions.
  • Other objects of the invention are: to provide an adjustable upand down-stop that will not change the uniformity of the key clip from one bank of keys to another when adjusted; to provide an adjustable up-stop that adjusts the effective key dip to provide as live a keyboard action as is desirable; to provide an adjustable down-stop that adjusts the total key dip to provide a total range of adjustment in an amount to suit the operator; and to provide key tension means thatrnay be adjusted to suit the touch of the operator.
  • Figure 1 is a front to rear View in sectional elevation showing the relation of the parallel key mechanism to the power operating mechanism of a typewriter
  • Figure 2 is a view of a portion of the key mechanism as illustrated in Figure 1 showing its use in connection with another form of powermechanism.
  • Figure 3 is a section taken on the line 33 of Figure 2 showing the control disk means for adjusting the.
  • Figure 4 is an enlarged view of the power trip bell crank showing the angular movement thereof.
  • the usual or standard keys 11 of a bank, forming the keyboard of the machine, are each mounted on the stem.
  • each lever 13 being part of a linkage comprising a powertrip bell crank 14, a key lever bell crank 16, and a link 17 connecting the depending portions 18 and 19 of the key lever bell crank 16 and the power-trip bell. crank 14,
  • the shaft 24, referred to as a down-stop, is adjacent edge 22 while.
  • the power-trip bell crank 14 pivots on fulcrum wire 27 carried in the lower slotted end of cross bracket 28 while the key lever bell crank 16 pivots about fulcrum wire 29 carried in fulcrum bracket 31 which also supports a comb 32 for supporting the key levers 13 to guard against side play of the latter.
  • the arm 33 of the powertrip bell crank 14 is equal in length from pivot to pivot, to the arm 34 on the key lever bell crank 16 while arm 19 on the power-trip bell crank 14 is equal in length to arm 18 on the key lever bell crank 16.
  • the key lever 13 ties the arm 33 on crank 14 to the arm 34 on crank 16 and link 17 ties the arm 19 on crank 14 to the arm 18 of crank 16.
  • the stop edges 22 and 23 on link 17 are arranged to limit the travel of the link through the eccentric shafts 24 and 26. Except for the positions of the key stems 12, this linkage is identical for all printing keys.
  • Figure 4 shows diagrammatically that when the downstop shaft 24 is adjusted for a desired total key dip, the key dip and the angular displacement U of the powertrip bell crank 14 is the same for all the rows of key levers 13.
  • the down-stop shaft 24 is in a universal adjustment of the total key dip which universally adjusts the angular motion U of the power-trip bell crank 14.
  • the power mechanism is of the type illustrated in Patent No. 2,737,279 granted March 6, 1956 to F. W. Schremp, while the power mechanism shown in connection with Figure 1 is shown in a copending application of common assignee, Serial No. 813,159 filed May 14, 1959.
  • the effective key dip is the amount of total dip that is required to trip the power mechanism. This effective dip is adjustable by the eccentric up-stop shaft 26.
  • Each unit of the key lever or parallel linkage 16 is held in normal position, as shown in Figure 1, by a spring 39, attached at one end to an anchor bail 41, suitably pivoted at its opposite endsfor swinging adjustment, and fastened at its opposite end to the trip trigger 36 which is pivoted as at 42 to the free end of the arms 43 of the power-trip bell crank 14.
  • the latter carries a limit pin 44. for engagement with a ledge on the trigger 36 so. that the pull of the spring 39 tends to rotate the bell crank 14 in clockwise direction about pivot 27 and through arm 19 move the stop link 17 leftward to cause the stop edge 23 thereof to abut the rip-stop shaft 26.
  • the depression of a key causes a counterclockwise rotation of the powertrip bell crank 14' against the yieldable resistance of spring 39.
  • FIG. 2 a different form of a stop link 52 is shown which has a tab 53 whose opposite edges provide abutments 54 and 56 with the abutment 54 of which the up-stop 57 coacts.
  • the latter is an eccentrically mounted shaft which is preset to define the extent of the gap 30, as previously explained, while a down-stop 58 in the form of a bail 59, common to all of the stop links 52, is pivoted at its ends as at 61 and through a link 62 is operated by an eccentric cam 63 on the shank of the disk 47.
  • Each of the disks 46 and 47 is provided with a groove 64 for limiting the adjusting movement of said disks with respect to limit stops 66 extending downwardly from the front edge of the frame.
  • a suitable dial can be used at the end of shaft 24 to adjust the same.
  • a typewriter the combination with a power mechanism for operating a printing type bar including 'a trigger link and a trip trigger for engaging said link to'control the operation of the power mechanism; of downwardly movable key lever means, bell crank means for supporting the trigger and to which bell crank means an end of said lever means is pivoted, stop link-means pivoted to said bell crank means and movable horizontally on a downward movement of said lever means, said stop link means presenting a plurality of abutments, stop means coacting with said abutments for limiting horizontal movement of said stop link means in opposite directions to adjust the time of engagement of said trip trigger with said trigger link, and means for adjusting the position of said stop means.
  • a parallel key lever action for a typewriter or the like comprising a plurality of linkages of substantially like shape for each key including downwardly movable key lever means, recessed stop link means, bell crank means presenting arms of like length to which the opposite ends of the key lever means and the opposite ends of the stop link means are pivoted whereby downward dip of the key lever means will produce horizontal movement of the stop link means, trigger means on one of said bell crank means for tripping operation of a power mechanism, and stop means for adjusting the longitudinal movement of the stop link means to regulate the dip of the key lever means and the relative operation of said trigger means.
  • a parallel key action comprising a plurality of linkages of substantially like shape for each key including downwardly movable key lever means, recessed stop 'link means, bell crank means presenting arms of like length to which the opposite ends of the key lever means and the opposite ends of the stop link means are pivoted whereby downward dip of the key lever means will produce horizontal movement of the stop link means, one of said bell crank means controlling the operation of said power means, means engaging the recess of said stop link means for limiting the operation of said one bell crank means, a key tension means associated with one of said bell crank means, and means for varying the stress of said key tension means.
  • a typewriter the combination with a power mechanism for operating a printing type bar including a trigger link and a trip trigger for engaging said link to control the operation of the power mechanism; of downwardly movable key lever means, bell crank means for supporting the trip trigger and to which bell crank means for supporting the trip trigger and to which bell crank means an end of said lever means is pivoted, stop link means pivoted to said bell crank means and movable horizontally on a downward movement of said lever means, stop means coacting with said stop link means for limiting horizontal movement of the latter in opposite directions to adjust the time of engagement of said trip trigger with said trigger link, and means for adjusting the position of said stop means with respect to said stop link means.
  • a parallel key lever action comprising a plurality of linkages of substantially like shape for each key including downwardly moving key lever means, stop link means, key lever and powertrip bell crank means presenting arms of like length to which the opposite ends of the key lever means and the opposite ends of the stop link means are pivoted respectively, whereby typing operation of the key lever means will produce reciprocal movement of the stop link means, trigger means on said power-trip bell crank means for tripping operation of a power mechanism and means common to all of said stop link means for adjusting the amount of downward movement of said key lever means and the free movement of the trigger means to vary the time of operation of said power mechanism.
  • a parallel key lever action comprising a plurality of linkages of substantially like shape for each key including downwardly moving key lever means, stop link means, key lever and powertrip bell crank means presenting arms of like length to which the opposite ends of the key lever means and the opposite ends of the stop link means are pivoted respectively, whereby typing operation of the key lever means will produce reciprocal movement of the stop link means, trigger means on said power-trip bell crank means for tripping operation of a power mechanism and means common to all of said stop link means for adjusting the amount of upward movement of said key lever means and the downward spacing movement of said trigger means with respect to said power mechanism.
  • obliquely disposed key levers of like shape key stems on said key levers arranged in banked rows, a stop link for each key lever, a key lever bell crank for connecting the forward end of each stop link with an associated key lever, a powertrip bell crank for connecting the rearward end of each stop link with an associated key lever, the arms of each of said bell cranks being of a length to provide horizontal linear movement of the stop links when the key levers are moved down, and means common to all of said stop links for adjusting the linear movement thereof in opposite directions.
  • a typewriter of the character set forth in claim 7 including a power mechanism for each key lever for operating type bars in printing action, said power mechanism having operation controlling trigger means, a trip means carried by each power-trip bell crank for operating the trigger means, and the trigger and trip means being spaced to provide a gap tberebetween adjustable by the linear movement of said stop link to time the operation of said power mechanism.
  • a typewriter as set forth in claim 5 including bail means common to all of said power-trip bell crank means, springs connecting the bail means and the bell crank means, and means for adjusting the bail means and ten- 5 6 sioning said springs for varying the operating resistance References Cited in the file of this patent of said key lever means in typing action.

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US810736A 1959-05-04 1959-05-04 Parallel key action for typewriters Expired - Lifetime US2966249A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US810736A US2966249A (en) 1959-05-04 1959-05-04 Parallel key action for typewriters
BE598962A BE598962A (fr) 1959-05-04 1961-01-10 Mécanisme de leviers de touches parallèles pour machines à écrire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US810736A US2966249A (en) 1959-05-04 1959-05-04 Parallel key action for typewriters

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US2966249A true US2966249A (en) 1960-12-27

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BE (1) BE598962A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616886A (en) * 1969-07-02 1971-11-02 Singer Co Compact low silhouette keyboard mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666267A (en) * 1925-04-24 1928-04-17 S E Miller Writing machine
US1741690A (en) * 1928-08-03 1929-12-31 L C Smith & Corona Typewriters Typewriting machine
US2567943A (en) * 1949-08-16 1951-09-18 Royal Typewriter Co Inc Mechanism for varying the tension of normalizing springs of typewriters or like machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666267A (en) * 1925-04-24 1928-04-17 S E Miller Writing machine
US1741690A (en) * 1928-08-03 1929-12-31 L C Smith & Corona Typewriters Typewriting machine
US2567943A (en) * 1949-08-16 1951-09-18 Royal Typewriter Co Inc Mechanism for varying the tension of normalizing springs of typewriters or like machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616886A (en) * 1969-07-02 1971-11-02 Singer Co Compact low silhouette keyboard mechanism

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Publication number Publication date
BE598962A (fr) 1961-05-02

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