US1981982A - Typewriting machine - Google Patents

Typewriting machine Download PDF

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Publication number
US1981982A
US1981982A US586319A US58631932A US1981982A US 1981982 A US1981982 A US 1981982A US 586319 A US586319 A US 586319A US 58631932 A US58631932 A US 58631932A US 1981982 A US1981982 A US 1981982A
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US
United States
Prior art keywords
type
levers
machine
frame
bar
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
US586319A
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English (en)
Inventor
Avery Henry Allen
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.)
SCM Corp
Original Assignee
LC Smith and Corona Typewriters Inc
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 FR742948D priority Critical patent/FR742948A/fr
Application filed by LC Smith and Corona Typewriters Inc filed Critical LC Smith and Corona Typewriters Inc
Priority to US586319A priority patent/US1981982A/en
Priority to GB24727/32A priority patent/GB389395A/en
Priority to DES106169D priority patent/DE645558C/de
Application granted granted Critical
Publication of US1981982A publication Critical patent/US1981982A/en
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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/02—Type-lever actuating mechanisms

Definitions

  • This invention relates to improvements in typewriting machines, and more particularly to improvements in the construction and arrangement of the actuating mechanism for the types and of the universal bar associated with said type actuating mechanism for operation thereby to actuate other partsof the machine at the type key strokes.
  • the invention provides a key to type actuating ⁇ train affording an easy starting and high degree of acceleration of the printing stroke of the type, good manifolding power, a quick return, and a locking of the returned type bar against ,5 rebound, all in a type action of few parts very compactly arranged in all dimensions of the machine; and, at the same time, avoids extending any parts of the system of type actions to the rear of the type bar segment, keeps the platen and the m highest parts of the system of type actions substantially at the level of the highest or rear bank of keys of the keyboard, brings the heads of the type bars very close to the keyboard and locates the type bar segment at a very low level in the machine frame.
  • the invention also aiords a very compact and eiicient construction and arrangement of the universal bar with reference to the system of type actions, and efcient, uniform and easy operation of the universal bar by single-arm upstanding sub-levers pivoted in a horizontal arc at substantially the lowest part of the machine frame.
  • the type action is particularly suited for small and low portable typewriting machines of the three-quarter strike variety in which the types.
  • Fig. 1 is a vertical longitudinal sectional view of the machine showing a central type action and the type action at the right hand side of the machine;
  • Fig. 2 is a detail view showing the central type action operated to place the type against the platen; and n Fig; 3 is a top plan view of the parts shown 1n Fig. 1.
  • the type bars 10 are pivoted on the usual arcuate pivot wire 11 in the usual slotted type bar 9 supporting segment 12 to strike at a common cenu ter on the upper front quarter of the platen 13 which is supported on the usual platen carriage, not shown.
  • the central or lowest part of the segment is close to the level of the lowest edge of the machine frame.
  • 'I'he machine is provided with the usual universal or standard keyboard with four stepped banks or rows of type keys 16.
  • the type bars normally, or when at rest, extend. upwardly and forwardly substantially perpendicularly to the plane of the segment and are provided at theirfforward ends with the usual printing type carrying headsor blocks, as shown.
  • the heads of the type bars are close to and behind the highest or rear bank of type keys and approximately at the level of said bank of keys, as shown.
  • An arcuate type rest 17 supports the type bars in. their rest position, said rest 17 engaging under the arcuate system of type bars about midway between the heads and pivots of the bars and is supported by a frame 18 held to segment support 14.
  • each type bar is formed with a short heel 19 extending downward from its pivot, the heels of the central bars extending very close to the level of the lower edge of the machine frame 15.
  • the heel of each type bar is connected by a sheet metal link 20 to the upper end of one of a series of upstanding single-arm sub-levers 21 extending downward to the lower edger of the 5 machine frame.
  • the several sub-levers 21 are pivotally supported at their lower ends on a curved pivot wire 22 in a slotted sub-lever segment 23 lying in a horizontal plane at the lower edge of the machine frame with its ends curving o toward the rear end of the machine and secured to the sides of the machine frame.
  • the pivot wire 22 lies in a horizontal plane with its ends curved toward the rear of the machine, and the radius of this arcuate pivot Wire and of segment 23 is much greater than that of pivot wire 11 and segment 12, being such that each sublever 21 swings in a vertical plane in which is located the pivoted connection of the link 20 with heel 19 of the type bar that is actuated by the sub-lever, so that each link 20 extends substantially parallel with the connected type bar from the type bar to the sub-lever.
  • each sub-lever is close to the head of the type bar actuated by the lever, being at a slightly 10 lowerv level than the said head and in practically the same vertical plane transverse of the machine in which the said head lies, while the lower end and fulcrum of each sub-lever are substantially directly under the upper end of the lever,
  • the respective upright sub-levers thus swing about horizontal axes at their lower ends, and swing in radial planes converging tothe medial fore and aft vertical plane of the machine at a point behind the type bar segment.
  • each link 20 with a type bar heel is designated 24, and the pivotal connection of each link with the upper end of a sub-lever 21 is designated 25, and all links 20 are of the same length, the curvature of segment 22 being such as to permit this'with sub-levers having their upper and lower ends positioned as above described.
  • the type keys 16 are fixed on vertically reciprocable key-carrying bars formed of sheet metal, which key bars have upstanding portions 26 nor- .mally in register transversely of the machine a short distance forward of the sub-levers 21 and the lower ends of which are at a slightly higher level than the sub-lever segment 23.
  • the upstanding portion 26 of each key bar is pivotally held at 27 and 28 to the rear ends of a pair of superposed short sheet metal links 29 and 30 normally inclined upward and rearward and fulcrumed at their forward ends on horizontal pivot rods 31 and 32 extending in a straight line directly transversely of the machine.
  • Rods 31 and 32 are supported by a'transverse sheet metal frame piece 33 held atits ends to the sides of machine frame l5, to which frame is also attached a slotted sheet metal guide comb 34.
  • Each key bar has a portion 35 extending forward from upright portion 26 at a-point between its pivots and normally engaged under a horizontal key lever stop cushion 36 held in a channel member 37 secured to frame piece 33 at the rear face of said frame piece below the rod 3l.
  • Portions 35 of the key bars for the three forward banks of keys are extended forward of the cushion and comb and support the keys of these banks, these forwardly elongated portions 35 being guided in the slots of the comb to prevent lateral flexure.
  • the key bars for the rear banks of keys are pro vided with key supporting portions 38 extending upward from the upper ends of portions 26 of these key bars and located above the series of links 29.
  • All links 29 are of the same length, all links 30 are of the same length, all pivots 27 are in register transversely of the machine in a single straight horizontal line, and all pivots 28 are in register transversely ofthe machine in a single straight horizontal line.
  • Portion 26 of each key bar has a short rearwardly extending lug 39 just above pivot 28, which lug is permanently bendable up and down to adjust the normal level of its rear end vertically.
  • Each sheet metal sub-lever 21 has a forwardly extending lug 40 at a slightly higher level than lugs 39 of the key bars, all lugs 40o having their forward ends in register transversely of the machine in a single straight horizontal line and connected by normally transversely registered pivots 41 to the rear ends of short sheet metal links 42, all of the same length and normally slightly inclined forward and downward to lugs 39 to the rear ends of which they are connected by normally transversely registered pivots 43.
  • Each link 42 has the lower end of one of a series of type action return springs 44 attached. thereto about midway its ends, the upper ends of the springs being attached to a straight horizontal bar 45 secured at its ends to brackets 46 held to the sides of the machine frame.
  • One branch or leg of the toggle is formed by link 42 and the other branch or ⁇ leg of the toggle is a compound or multi-part up and down swinging leg formed by the key bar and the substantially parallel links 29 and 30 anchored re- ⁇ spectively at 3l and 32 and tied together at their opposite ends by the key bar to which center pivot 43 of the toggle is connected.
  • the three parts of the forward multi-part leg of the toggle swing up and down substantially as a unit, and in the idle position of the type action the toggle is very slightly closed in the upward direction by the lifting of the center pivot slightly above line A-A through the end or anchorage pivots 32 and 41, thus preventing rebounding of the type bars from the type rest.
  • the toggle linkage occupies very little space either fore and aft of the machine or vertically and that, even with this small space requirement, the major part of the system of toggles is located in space under the rearmost banks of keys, while the levers and the links from the levers to the type bars are almost entirely located within the space under the system of type bars, which in turn are located very low in the machine frame.
  • the hig er ends of links 29 are about level with the up er ends of the shortest sub-levers, the higher ends of links 30 are at a slightly higher level than the sub-lever segment, and the lower .ends of links 39 are below the level ofthe sub-lever segment and very close to the bottom of the machine frame.
  • the toggle linkage is connected to the up-standing sub-levers at 41 at a level a short distance higher than the pivoted lower ends of these sublevers.
  • a universal bar for actuating other type key controlled parts of the machine such as the ribbon mechanism and the escapement mechanism for the platen carriage is arranged and constructed for actuation by the type actions in an efficient and easy manner and also so as to oontribute to compactness of the machine.
  • the universal bar 50 A is arcuate in plan, curving around the segment 23 in front of and close to the forward edge or face of the segment on a radius greater than thatof pivot wire 22.
  • These side arms have pendent arms 56 and 57 which may be connected with a mechanism to be actuated by the universal bar.
  • a link 47 leads to an arm 48 on a shaft 49 journaled on part of the frame of the machine for actuating one of the mechanisms controlled by the universal bar.
  • Shaft 49 has a rock arm 58 connected to part of the machine frame by a return spring 59 which also serves to normally hold the universal bar rocked up into the position shown in Fig. 1 with a stop nger 60 on side arm 52 engaged under a xed stop 61 held to the machine frame.
  • the universal bar is depressed on the down strokes of the type keys by lugs 62 on the sublevers 21.
  • Each of these lugs extends in the idle position forward and slightly upward in the radial plane of its sub-lever from the lower pivoted end of the sub-lever with its lower edge extending across and slightly above the upper edge of the universal bar 50.
  • the normal spacing of these lugs above the universal bar is the same for all the lugs.
  • a typewriting machine the combination of a main frame, a cylindrical platen, a .type bar segment supported in the frame in a rearwardly tilted position with the lowest part of the se'gment close to the lowest level of the frame, a series of type bars pivoted on the segment with their pivots lying in an arc in a rearwardly inclined plane tangent to the platen at the upper front portion of the platen, said type bars extending upward and forward from their pivots and having heels extending downward from their -pvots, a horizontally disposed segment supported in the frame substantially at the lowest level of the frame extending under the type bars land curving toward the rear of the machine from the middle of the segment, a series of upstanding levers progressively increasing in length from the middle toward the sides of the machine and all pivoted at their lower ends in said horizontal segment with their pivots in an arc curved in the same direction as said segment and in a horizontal plane to swing in vertical planes converging toward the middle of the machine at a point behind the type bar
  • a typewriting machine the combination of a main frame, a cylindrical platen, a type bar segment supported in the frame in a rearwardly tilted position with the lowest part of the segment close to the lowest level of the frame, a series of typebars pivoted on the segment with their pivotslying in an are in a rearwardly inclined plane tangent to the platen at the upper front portion of the platen, said type bars extending upward and forward from their pivots and having heels extending downward from their pivots, a horizontally disposed segment supported in the frame substantially at the lowest level of the frame extending under the type bars and curving toward the rear of the machine from the middle of the segment, a series of upstanding levers progressively increasing in length from the middle toward the sides of the machine and all pivoted at their lower ends in said horizontal segment with their pivots in an arc curved in the same direction as said segment and in a horizontal plane to swing in vertical planes converging toward the middle of the machine at a point behind the type bar segment, a series of links connecting
  • a typewriting machine having 'a frame, a keyboard in the front part of the frame comprising stepped banks of keys, a roller platen at the rear part ofthe frame substantially at the level of the highest bank of keys, an arcuate system of typebars pivoted to strike at a common printing point on the upper front part ofthe platen and normally extending upward and forward from their pivots between the platen and keyboard and having heels, anarcuate system of upstanding levers interposed between the type bars and keyboard and pivoted-at their lower ends to-swing in rearwardly converging planes, the highest parts of the systems of type bars and levers being substantially at the level of the platen and the highest bank of type keys, said levers having portions above their pivots normally registering in a, straight line across the frame, a system of ⁇ parallel fore-and-aft extending toggle devices of identical length anchored at their rear ends to said lever portions and at their front ends to the frame, a system of key stems each extending from and rigidly held to a portion of a different
  • a typewriting machine as claimed in claim 4 having a transversely extending spring anchor member supported in the frame above the toggle devices and between the keyboard and the system of levers, and a system of return springs anchored to said member and to the toggle devices and normally yieldingly holding said toggle devices in slightly upwardly closed condition.
  • a typewriting machine having a frame, a platen, an arcuate system of rearwardly swinging pivoted type bars having heels and normally extending upward and forward from their pivots forwardly of the platen, a keyboard comprising stepped banks of type keys arranged in front of the system of type bars, a system of upstanding levers pivoted at their lower ends and interposed between the system of type bars and the keyboard, said platen, the highest bank of said keys and the highest parts of the systems of levers and type bars being all located substantially at the same level, a system of draw links connecting the upper ends of the levers to the heels of the type bars, a system of toggle devices anchored at their rear ends to said levers abovel the lever pivots and at their forward ends to the frame and extending under the keyboard, and key stems each rigidly joined to a portion of a different one of the toggle devices and carrying one of the type keys.
  • each toggle device comprises an upstanding member to which one of the key stems is rigidly joined, a pair of superposed links anchored at their forward ends to the frame and at their rear, ends to said upstanding member, and a third link anchored at its forward end to said upstanding member and at its rear end to one of the upstanding levers.
  • a typewriting machine the combination of a main frame, a keyboard. at the front of the frame having stepped banks of type keys, a rearwardly tilted type bar segment in the frame behind the keyboard, a system of normally upwardly and forwardly inclined type bars pivoted at 130 their rear ends in said segment to strike at a 'common printing' point, said bars having pendent heels and the pivot of the central type bar being located close togthe bottom of the frame, n a platen located to receive impacts vof--types on 105 the bars at a printing point at the upper front portion of the platen, the platen and highest parts of the system of.
  • the bars being approximately at the level of the highest bank of keys, a system of links extending longitudinally of the type bars and attached at their rear ends to the heels of said bars, a system of upstanding foreand-aft swinging levers adjacent the forward ends of the type bars and to the upper ends of which 145 levers the forward ends of said links are connected close to the forward ends of the bars, saidv levers having their lower ends pivoted on horizontal axes in the frame at a common level close to the bottom of the frame, a system of fore- -150 A 1,981,982 and-aft extending toggle devices forward of thel system of levers and each supporting 'one of the type keys, each toggle device being anchored to the frame under the keyboard and anchored to one of the levers between the lever pivot and the connection of the lever with the link leading to the heel of the connected type bar, a.
  • stop engageable by the toggle devices to limit upward movement of the keys by said devices, return springs connected to the toggle devices to normally hold them engaged with said stop, and a universal bar pivoted on the frame and extending across the machine under the toggle devices forward of the system of levers for rocking by said levers when the type keys are actuated.
  • a typewriting machine as claimed in claim 8, wherein all the links are of equal length, all the toggle devices are of equal length and are normally in register transversely of the machine with their rear ends pivoted to the levers in a straight horizontalline transversely of the machine, the levers have forwardly extending lugs overhanging the universal bar at the same horizontal level and have their pivots in a horizontal arc which curves rearward from the middle to the sides of the machine, and the universal bar is curved in the same direction as said arc and is pivoted to swing up and down and is spring urged upwardly.

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US586319A 1932-01-13 1932-01-13 Typewriting machine Expired - Lifetime US1981982A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR742948D FR742948A (en:Method) 1932-01-13
US586319A US1981982A (en) 1932-01-13 1932-01-13 Typewriting machine
GB24727/32A GB389395A (en) 1932-01-13 1932-09-05 Improvements in actions for typewriting machines
DES106169D DE645558C (de) 1932-01-13 1932-09-10 Schreibmaschine, bei der die Typenhebel in einem geneigten, tiefliegenden Segment gelagert sind

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US586319A US1981982A (en) 1932-01-13 1932-01-13 Typewriting machine

Publications (1)

Publication Number Publication Date
US1981982A true US1981982A (en) 1934-11-27

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Application Number Title Priority Date Filing Date
US586319A Expired - Lifetime US1981982A (en) 1932-01-13 1932-01-13 Typewriting machine

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US (1) US1981982A (en:Method)
DE (1) DE645558C (en:Method)
FR (1) FR742948A (en:Method)
GB (1) GB389395A (en:Method)

Also Published As

Publication number Publication date
DE645558C (de) 1937-05-29
FR742948A (en:Method) 1933-03-18
GB389395A (en) 1933-03-16

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