US3643772A - Typebar drive mechanism - Google Patents

Typebar drive mechanism Download PDF

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Publication number
US3643772A
US3643772A US7863A US3643772DA US3643772A US 3643772 A US3643772 A US 3643772A US 7863 A US7863 A US 7863A US 3643772D A US3643772D A US 3643772DA US 3643772 A US3643772 A US 3643772A
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US
United States
Prior art keywords
drive
typebar
pushing
crank
pushing edge
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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
US7863A
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English (en)
Inventor
Arthur Kittel
Kurt Chvatlinsky
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Olympia Werke AG
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Olympia Werke AG
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Publication date
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    • 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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/02—Mechanical power drives
    • B41J23/04—Mechanical power drives with driven mechanism arranged to be clutched to continuously- operating power source
    • B41J23/08—Mechanical power drives with driven mechanism arranged to be clutched to continuously- operating power source by one-revolution or part-revolution clutches

Definitions

  • a typebar drive mechanism for a plurality of typebars has a drag link with a bellcrank and two associated links at the reciprocating end.
  • a drive rail is rotatably mounted on the [30] Foreign Apphcahon Pnomy Data reciprocating end of the drag link so as to have a pushing cdge Feb. 1, 1969 Germany ..P 19 04 964.0 that describes different paths during the outward and return movements of the reciprocating end of the drag link.
  • a drive [52] US. Cl ..197/14, 197/17 p is provided for each yp each p l h ving a p hing [511 Int. Cl.
  • the present invention relates to a typebar drive mechanism for power-driven typewriters and similar machines in which the typebar movement is controlled by a continuously rotating shaft through a clutch release by the actuation of a keylever and is transferred by a drive crank to a drive pawl of the respective typebar mechanism.
  • devices which permit the preselection of characters before the previously selected character has finished its printing cycle. This leads to substantial increases in the typing speed and, thus, to a saving of time.
  • the entire typebar drive mechanism must be so designed that, on the one hand, no components of the selected mechanism impede the movement of the typebar mechanism in action by their position nor, on the other hand, are they themselves prematurely actuated and caused to move in an interfering manner. The entire transfer of movement must occur as smoothly and noiselessly as possible.
  • Proposals have become known to accomplish separation of stacked or similarly supplied groups of objects, particularly cards, without interference by the drive member effecting the displacement on its return path, in that the pushing edge is part of a coupler link.
  • the curbed path of the respective coupling point is here utilized to guide the pushing edge in force-transmitting relationship with the pushed card edge when pushing it away and to a sufficient distance from the next card surface when it returns in the starting position.
  • a drive crank having a rotatably disposed drive rail thereon whose pushing edge describes different curves during forward and return movement of the drive crank in such a manner that a pushing tongue of the preselected drive pawl latch for the next typebar mechanism remains untouched by the pushing edge returning into its starting position.
  • the drive crank according to the present invention is a member of a known, four-sided linkage in the form of a four-bar drag link mechanism; the drive rail which is rotatably mounted on this drive crank being journaled to a coupler link via a connecting link.
  • the members of the drive crank, as well as the swing arm associated with the drive rail and the connecting link have a speed ratio so selected that the pushing edge of the drive rail performs different curves during forward and backward movement which together have a kidney shape.
  • the typebar drive mechanism is provided with an extension on the crank arm for a crankpin in the form of a disc concentric with the main shaft, as well as a pivotally mounted catch lever with a detent roller which is pulled by a tension spring against the periphery of the disc and can there engage in a detent catch to produce a defined and reproducible stop position of the crank drive.
  • the distance between the pushing edge, on the one hand, and the pushing tongue of the respective drive pawl, on the other hand be adjustable. This is preferably accomplished according to the present invention by making the drive rail, which is permanently connected to a reciprocating drive crank by means of a shaft, adjustable by means of a swing arm adjustably fastened on this shaft and coupled with the connecting link against the coupler link.
  • the second regulating possibility is that the position of the crank swing is variable for changing the distance of the pushing edge from the respective pushing tongue in dependence on the type selection and on the number of copies produced, for which purpose an eccentric bushing is adjustably disposed on the crankpin which bushing is permanently connected with a pivot arm.
  • a preferred embodiment provides that the eccentric bushing is adjustable through a coupling connected, on the one hand, with the pivot lever and, on the other hand, with a disconnectable sliding block crank.
  • the sliding block crank is guided to be longitudinally movable and is provided with teeth into which a toothed transmission lever engages.
  • This toothed lever is mounted on the switchable typebar segment bearer which can be pivoted by a setting and arresting lever disposed at the keyboard via a connecting rod joined to the two levers.
  • FIG. 1 is a schematic side elevation view of the crank drive and the drive rail of the typebar drive mechanism according to the present invention.
  • FIG. 2 is a perspective view of the typebar drive mechanism of FIG. 1.
  • FIG. 3 is a perspective view, partly in cross section, showing the main shaft, disc, crankpin and eccentric bushing of FIGS. 1 and 2.
  • a main shaft 2 is supported by frame 1 and driven through a switchable clutch (not shown), for example a one-revolution clutch such as disclosed in the Salzberger et al. U.S. Pat. No. 2,059,537, dated Nov. 3, I936.
  • a switchable clutch for example a one-revolution clutch such as disclosed in the Salzberger et al. U.S. Pat. No. 2,059,537, dated Nov. 3, I936.
  • Shaft 2 bears a disc 3 having a crankpin 4 and a rotatable eccentric bushing 4a, in which the rear end 5a of a coupler link 5 is disposed.
  • the front end 5b of coupler 5 is pivotally connected with the upper end of an angular drive crank, such as bellcrank 6.
  • This drive crank 6 is firmly attached to the one end ofa shaft 8 which passes transversely through the machine and which is rotatably mounted in the frame 1 of conventional construction.
  • Crank 6 is further provided with a bearing 9 at its corner point, approximately at half its length, for a rotatably mounted swing shaft 10, which also passes transversely through the machine and is mounted with its other end in a bearing arm 6 fastened to shaft 8.
  • the swing shaft 10 bears a drive rail 12 having a pushing edge 13 fastened rigidly to the shaft 10.
  • a swing arm 14 is rigidly adjustably fastened thereto by means of screws 1411 through a U-shaped portion 14.
  • the swing arm 14 is pivotally coupled to the coupler by means of a connecting link 15 and a suitably disposed pivot 16 approximately in the longitudinal Center of the coupler 5. Swing arm 14 is pivotally connected to link 15 by pivot 16.
  • the effective crank arm k of the eccentric bushing 4a, the coupler 5 and the drive crank 6 together form a drag-link mechanism.
  • a second system is superposed thereon which consist of the swing arm 14 with the drive rail 12, the connecting link 15 and its pivots which are movable with respect to one another as well as to swing shaft 10 and joint 16.
  • the pushing and pivoting movement of the swing shaft 10 causes the pushing edge 13 to define a curve such as the closed, kidneyshaped path 113 (FIG. 1).
  • a drive pawl 17 for each typebar (not shown) and having a pushing tongue 117 is situated opposite the pushing edge 13, so as to be actuated by the pushing edge 13 when they are in the selected position.
  • the following description relates to the members of a drive mechanism.
  • Each drive pawl 17 is pivotally connected at its lower end by means of a molded hinge pin 17a to a longitudinal slot 19a of an associated intermediate lever 19 which is rigidly mounted on a shaft 19, to which a typebar should be imagined as being attached by means ofa pulley wire.
  • a continuous or separated abutment cushion 20 )FIG. 1) is associated with the intermediate levers 19 to fix their rest position.
  • a tension spring 18 normally pulls the drive pawls 17 counterclockwise, as seen in FIG. 1, and brings its pawl head 17b into a rest position so that it abuts at a slotted ledge with its associated limit abutment 26 (FIG. 1).
  • a key lever 27 is arranged so that its member 27a will pass through the slot in ledge 25.
  • An abutment cushion 20 retains key lever 27 in the clockwise direction.
  • a trigger 29 for a one-revolution clutch is disposed below the slotted ledge 25 and abuts member 26.
  • the members connecting it with the clutch connected with the main shaft 2 are not shown and may be like those shown in the Salzberger et al. US. Pat. No. 2,059,537, dated Nov. 3, I936.
  • a tension spring 30 suspended at one end in an eye defined in protrusion 6a at the bottom of the drive crank 6 and at the other end in an adjustable suspension element 31 in the frame 1.
  • Element 31 may be a grooved screw and pulls the crank 6 and the connected links, particularly the drive rail 12 toward the left and, thus, supports the drive.
  • Shaft 8 is also provided with a freely pivotal detent lever 32 which is pulled together with its detent roller 33 by a tension spring 34 against the disc 3 to hold it in engagement in the detent groove 3a in the disc 3, so that a definite rest position is defined.
  • the eccentric bushing 4a mounted on the crankpin 4 (FIG. 3) is firmly attached to a link 35 which is pivotally connected by means of a hinge pin 36 and suitable adjustment members, preferably a coupler 37 and a sliding block crank 38, to a bearing pin 40.
  • Teeth 43 of a transfer lever 42 which is mounted on a supporting bolt 44 fastened to a conventional switchable typebar segment carrier (not shown), engage with teeth 39 of the longitudinally displaceable sliding block crank 38, which is guided by guide rods 41 fastened to the typebar segment carrier.
  • a connecting rod 45 leads to a setting and arresting lever 50, which is preferably attached to the side of the keyboard and which serves to adjust the sliding block crank 38 and, thus, the eccentric bushing 40 in view of the number of carbon copies to be made, or with respect to other conditions.
  • the lever is pivoted at 51 and has a finger piece 52 projecting through an opening ofa plate 53 secured to the keyboard.
  • the regulating lever 50 is spring-biased sidewise and is set so that its finger piece 52 normally is pressed into one or another of the detent notches 54 formed on one side of the opening of plate 53 (FIG. 2).
  • the notches 54 of which there may be four, serve to hold the lever 50 in different stations.
  • the lever may be sprung slightly toward the left out of its set position for shifting it from one notch to another.
  • Actuation of a selector device symbolized by a key lever 27 having a pressure tongue 27a pushes the pawl head 17b of the respective drive pawl 17 downward from position I to position II (FIG. 1).
  • the simultaneously occurring release of the onerevolution clutch (not shown) by trigger 29 causes the main shaft 2 to rotate in the counterclockwise direction, the crank drive imparts movement to the coupler 5 first toward the left and immediately thereafter toward the right, the sinusoidal drive making this movement smooth;
  • the drive rail 12, which was simultaneously put in motion engages with its pushing edge 13 on the upper curve path ofthe drive tongue 117 (position II, shown in dashed lines) which has been pivoted to within its range and throws the selected drive pawl 17 toward the rear, i.e., in the working or outward direction, thereby ac celerating the intermediate lever 19 with the attached typebar (not shown).
  • the pushing edge 13 releases from tongue 117 due to the design of the pushing edge path 113, approximately one-sixth of the path length before the rear, or outward, return end 113a and is then brought toward the front return end 113b on the lower curve of the path. Because of this decisive path of movement, the pushing edge 13 lies so low that not only the tongue 117 of the above-mentioned selected drive pawl 17 is definitely held outside of the range of the returning pushing edge 13 during its return movement and, thus, causes no interference, but also a second important effect is here also guaranteed.
  • the pushing edge 13 After passing through the front return end 113b, the pushing edge 13 returns to the upper portion of its curve path 113, grips the tongue 117 of the preselected drive pawl 17 which is in readiness, and the cycle begins again.
  • a first adjustment of the distance of the pushing edge 13 from the drive tongues 117 is accomplished by releasing screws 14a in the U-shaped bend 141 of the swing lever 14. Now the swing shaft 10 together with the drive rail 12 and pushing edge 13 can be rotated as desired and the new position can be secured by tightening screws 1411.
  • a second regulation which is necessary with high-quality typewriters serves to adapt the striking force during typing of letters in the normal and shifted position.
  • the color density of the character imprint must remain as uniform as possible.
  • crank 35 pivoting the crank 35 at the eccentric bushing 4a which results in a displacement of the coupler 5 and, thus, the coupled pushing edge 13 with respect to the drive tongues 117.
  • Crank 35 receives its impulses from the slidingblock crank 38 which, in engagement with the respective arresting transfer lever 42, takes part in the up and down movement of the switchable typebar segment carrier through its supporting bolt 44.
  • the driveposition of the eccentric bushing 4a for the drive rail 12 is changed for typing in normal and shifted positions, particularly for lower and upper case letters.
  • FIG. 2 The normal position of the switchable typebar segment carrier is shown in FIG. 2 in full lines.
  • the crank 35 with the eccentric bushing 4a and the drive rail 12 with the pushing edge 13 will be rotated counterclockwise, shown in FIG. 2 by the dotted outline.
  • the pushing edge 13 stands in the extreme position for greatest force of the type action at the instant of printing. It will be seen now that the typebar segment carrier has automatically determined increased force of poweroperated type section.
  • crank drive produces a positive, i.e., always uniform, sinusoidal movement of the drive members.
  • This movement is smooth and has a particularly favorable effect on the drive rail and, thus, avoids peak stresses of the components and joints.
  • This increases the economical operation of the system in that careful dimensioning of the components can keep its masses within favorable limits, to which the production of suitable components, e.g., the drive pawls of a suitable resistant synthetic resins of the acetal plastic group, more particularly, a synthetic resin such as is sold by Du Pont under the trademark Delrin, is a contributing factor permitting the use of high-drive speeds.
  • the smooth operation also results in a noticeable noise reduction.
  • the proposed arrangement is also very economical in operation, since it permits the production of the exact coupling curve movement of the pushing edge 13 of the drive rail 12 with a drive mechanism present only on one side of the machine, so that the number of components is held relatively low and space is conserved in the always limited space available in powerdriven typewriters. Moreover, the manually accomplished adjustments are limited to one side of the machine.
  • a typebar drive mechanism for a plurality of typebars comprising, in combination:
  • a reciprocating drive means having an outward and a return movement
  • a drive rail rotatably mounted on said drive means and having a pushing edge, said rail being mounted on said drive means to execute an outward and return stroke such that the outward and return movement of said drive means causes said pushing edge to follow different paths sun during the outward and return strokes respectively;
  • a drive pawl for each typebar and each pawl having a pushing tongue arranged to be actuated by said pushing edge during the outward stroke of said drive rail when the respective typebar has been selected with the return stroke of said pushing edge arranged with respect to the outward stroke thereof as a result of said drive rail mounting so that the drive pawl of the next'selected typebar can be actuated before the drive rail has returned.
  • a mechanism as defined in claim 4 further including means for adjusting the distance between said pushing edge and a respective pushing tongue.
  • a mechanism as defined in claim 6 further including an eccentric bushing rigidly attached to the end of said coupler link attached to said crankpin and adjustable for the purpose of changing the position of the drag link mechanism, and a crank element being rigidly attached to said eccentric bushing around said crankpin.
  • a mechanism as defined in claim 7 further including coupling means connected to the end of said crank element opposite the end connected to said eccentric bushing and a sliding block crank connected to said coupling at a point opposite the connection to said crank element, so that the eccentric bushing may be adjusted.

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US7863A 1969-02-01 1970-02-02 Typebar drive mechanism Expired - Lifetime US3643772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691904964 DE1904964B1 (de) 1969-02-01 1969-02-01 Typenhebelantriebsvorrichtung fuer kraftangetriebene Schreib- und aehnlichen Maschinen

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US3643772A true US3643772A (en) 1972-02-22

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Application Number Title Priority Date Filing Date
US7863A Expired - Lifetime US3643772A (en) 1969-02-01 1970-02-02 Typebar drive mechanism

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US (1) US3643772A (enrdf_load_stackoverflow)
JP (1) JPS5012328B1 (enrdf_load_stackoverflow)
CH (1) CH500072A (enrdf_load_stackoverflow)
DE (1) DE1904964B1 (enrdf_load_stackoverflow)
GB (1) GB1290472A (enrdf_load_stackoverflow)
NL (1) NL7001201A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932797A (en) * 1988-06-17 1990-06-12 Printronix, Inc. Resettable locking platen gap adjustment mechanism
US5368013A (en) * 1992-10-19 1994-11-29 Herweyer; Elliot E. Parallel piped fluid heaters with staged flow controlled by magnetic priority valves
US9409105B2 (en) 2011-08-12 2016-08-09 Technical University Of Denmark Filtering apparatus and method for mixing, extraction and/or separation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1100795A (en) * 1910-08-22 1914-06-23 Underwood Typewriter Co Type-writing machine.
US1927761A (en) * 1929-03-28 1933-09-19 Tauschek Gustav Power drive for typewriters
US2010652A (en) * 1933-09-06 1935-08-06 Ibm Printing mechanism
US2059537A (en) * 1933-04-13 1936-11-03 Europa Schreibmaschinen A G Power-driven typewriting machine
US2891649A (en) * 1957-05-13 1959-06-23 Royal Mcbee Corp Manual and/or electric typewriters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1100795A (en) * 1910-08-22 1914-06-23 Underwood Typewriter Co Type-writing machine.
US1927761A (en) * 1929-03-28 1933-09-19 Tauschek Gustav Power drive for typewriters
US2059537A (en) * 1933-04-13 1936-11-03 Europa Schreibmaschinen A G Power-driven typewriting machine
US2010652A (en) * 1933-09-06 1935-08-06 Ibm Printing mechanism
US2891649A (en) * 1957-05-13 1959-06-23 Royal Mcbee Corp Manual and/or electric typewriters

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932797A (en) * 1988-06-17 1990-06-12 Printronix, Inc. Resettable locking platen gap adjustment mechanism
US5368013A (en) * 1992-10-19 1994-11-29 Herweyer; Elliot E. Parallel piped fluid heaters with staged flow controlled by magnetic priority valves
US9409105B2 (en) 2011-08-12 2016-08-09 Technical University Of Denmark Filtering apparatus and method for mixing, extraction and/or separation

Also Published As

Publication number Publication date
DE1904964B1 (de) 1970-09-03
GB1290472A (enrdf_load_stackoverflow) 1972-09-27
CH500072A (de) 1970-12-15
JPS5012328B1 (enrdf_load_stackoverflow) 1975-05-10
NL7001201A (enrdf_load_stackoverflow) 1970-08-04

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