US3799311A - Removable typehead for a printing mechanism - Google Patents

Removable typehead for a printing mechanism Download PDF

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Publication number
US3799311A
US3799311A US00179042A US17904271A US3799311A US 3799311 A US3799311 A US 3799311A US 00179042 A US00179042 A US 00179042A US 17904271 A US17904271 A US 17904271A US 3799311 A US3799311 A US 3799311A
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US
United States
Prior art keywords
shaft
type head
shaft means
arms
gear
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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
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US00179042A
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English (en)
Inventor
G Guerrini
R Falconieri
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Olivetti SpA
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Olivetti SpA
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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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/60—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies on spherical, truncated-spherical, or like surfaces

Definitions

  • the typehead is mounted on a shaft sup- PP 42 ported by a pair of spaced opposed arms.
  • One of the arms has a bearing completely encircling the shaft and 30 Forei n A cation Prior Dat the other arm has a bearing having a radial slot of 1 pp y a width less than the diameter of the shaft.
  • the shaft is Sept. 16, 970 Italy 70106/70 axially shiftable between a priming position and a w lease position by means of a knob attached to one 2% 8 197/18 ig end.
  • the shaft has a reduced diameter portion that is d 8 aligned with the slot in the release position so that the 1 o earc 01 1 l 6 shaft can be moved laterally out of the slotted bearing and pivoted out of the other bearing to remove the typehead from the printing device.
  • the typehead has a [56] References Cited recess that engages a drive gear mounted on the arms UNITED STATES PATENTS to rotate the typehead.
  • the arms are mounted for ro- 525,916 9/1894 Merriman 197/145 X tation about an axis perpendicular to the shaft and 1,319,428 10/1919 Spiro 197/145 provides the necessary compound rotational move- 3,347,159 AllIOI'ljl et 197/145 X ment for the typehead
  • the typehead and upport 3,348,649 10/1967 Cramer 197/52 arms are further provided with interengaging elements 2 1 5 for facilitating alignment of the type during insertion, 1:217:436 2/1917 Gabrielson 197/123 and for ll the.typehead when the 1,877,563 9/1932 Dobson 197/123 F the release Posmo dlsengaged from the earm s.
  • Various printing'mechanisms with a removable type head are known.
  • the type of characters of the head are arranged in rows and columns on a spherical shell fixed at the end of a vertical selector shaft.
  • This shell is open at the bottom and is defined at the top by a plane surface on which a fixing element is disposed.
  • This is fixed to the selector shaft by snap or spring action or. by means of a screw, the shaft being rotatable and inclinable for selecting the character to be printed.
  • a knob for shifting the shaft axially with respect to the head so as to disengage the head from the arms.
  • FIG. 1 is a front view, partly in section, of a removable type head for a printing mechanism embodying the invention
  • FIG. 2 is a section on the line ll-II of FIG. 1;
  • FIG. 3 is a side view from the right, partly in section, of the printing mechanism
  • FIG. 4 is a section of the mechanism on the line lV-IV of FIG. 1.
  • the printing mechanism of the invention can be used in office machines employing type heads in the form of a solid of revolution, such as drums, spheres, etc., rotatable in forked supports.
  • the mechanism comprises a barrel 10 (FIG. 1) of spheroidal form which bears a set of types 11 distributed in rows disposed in meridian planes (FIG. 2) and in vertical lines or columns disposed in parallel planes (FIG. 1).
  • the barrel 10 is carried by a substantially horizontal shaft 12, which is rotatable in two arms 13 and 14 ofa forked support 15.
  • the barrel 10 is positioned angularly in the support 15 through the medium of a gear 16 rotatable on a pivot 17 fixed to the arm 13 of the support 15.
  • the gear 16 is retained axially between the arm 13 and a terminal flange of the pivot 17 and meshes with a gear 18, fixed on a shaft 19 and rotatable in the arm 13.
  • the gear 18, in turn, is rotated by the shaft 19 through the medium of an articulated joint 21, in the manner described in our copending British Pat. application Ser. No. 21 188/71 to select in front of the striking point the row of the character to be printed.
  • the fork 15 is fixed on a substantially vertical shaft 22 which is rotatable between two bent portions 23 and 24 of a bail 26.
  • the fork 15 (FIG. 3) is moreover equipped with a pin 27 which is shiftable angularly to select in front of the striking point the vertical row or column of the character to be printed.
  • the ball 26 moreover provides for the striking of the selected type against a platen or printing cylinder not shown in the drawing.
  • the type barrel 10 comprises an outer shell 31 (FIG. 1) of thermoplastic or other suitable material provided with two plane side portions 32 and 33.
  • a hollow shaft 34 is forced between these side portions in such manner as to be angularly fast with the shell.
  • the axial fixing of the hollow shaft 34 to the side portions 32 and 33 is obtained on the one hand by means of a terminal flange 36 of the hollow shaft 34 and on the other hand by means of a ring 37 forced on to the free end thereof.
  • inner coaxial shaft 12 which has a terminal portion 38 of reduced diameter rotatable in a portion 39 of the hollow shaft 34.
  • the inner shaft 12 has two substantially conical zones 41 and 42 which are joined at the larger base and are connected to two other portions of reduced diameter.
  • the shaft 12 has, over a depth of about half its diameter, a transverse notch 43 defined by two straight lateral faces 43a and 43b.
  • a wire of high elasticity 44 (FIG. 2), for example a wire as used for springs, which extends through two holes 46 in the shaft 34, as a result of which it is fixed transversely to the shaft 34.
  • the wire acts as a connecting key between the two shafts 12 and 34.
  • wire 44 has a first bend 47, which prevents the disengagement of one end, and a second bend 48 (FIG. 1) which arranges the wire 44 parallel to the shaft 34.
  • the terminal portion of this part of the wire 44 is bent again once at right angles and is freely slidable in a hole 49 in the shaft 34.
  • the end of this slidable portion, indicated by the reference 51, is rounded and is adapted to co-operate resiliently with one of the two conical surfaces 41 and' 42 of the shaft 12, acting on the latter as a spring locating device.
  • the shaft 12 has another transverse reduction, for example a groove 52 defining a core 53 with a diameter smaller than that of a last terminal portion indicated by the reference 54.
  • a knob 56 with a knurled gripping surface is attached to the terminal portion 54 of shaft 12.
  • a pair of slots 55 parallel to the knob 56 in the side portion 32 permit the fitting of the hollow shaft 34 together with the bent wire 44.
  • a key 60 of the shaft 34 finally fixes the axial position of the latter with respect to the barrel 10.
  • the terminal portion 38 projects from the side portion 33 and is rotatable in an axial hole 57 of the pivot 17.
  • the gear 16 is provided with a front projection 59 (FIG. 4) which is constituted by two flanks 61 which are parallel and symmetrical with respect to an axis perpendicular to the axis of the pivot 17.
  • the two flanks 61 are united by a curved portion 63 and are connected by means of two curved portions to another two flanks 66 disposed at a greater interval compared with the flanks 61.
  • the projection 59 normally engages in a corresponding recess 67 in the form of an inverted U arranged in the side portion 33 and provided with a curved connection 70. This recess is symmetrical with respect to a radial axis 68 parallel to the two slots 55 (FIG. 3) and copies in negative form the front projection of the gear 16 (FIG. 4).
  • the terminal portion 54 (FIG. 1) of the shaft 12 is normally rotatable in a bushing 69 which is fixed to the arm 14 of the forked support 15. In addition to the pivot 17 and the bushing 69 supporting the shaft 12, they bear against the shaft 34 axially, ensuring the axial location of the barrel between the two arms 13 and 14 of the support 15.
  • the bushing 69 moreover projects inwardly from the arm 14 and is adapted to cooperate with a substantially semi-circular hood 71 (FIG. 3) disposed on the side portion 32 of the shell 31 and the axis of symmetry of which, indicated by the reference 72, is parallel to the axis 68 (FIG. 4) of the recess 67.
  • the bushing 69 (FIG. 3)
  • the arm 14 moreover have a radial slot 73 and 74 of a width greater than the diameter of the core 53, but smaller than the diameter of the terminal portion 54.
  • the inclination of the slots 73 and 74 is moreover such that, in correspondence with the selection of a predetermined row of types, the recess 67 (FIG. 4) and the hood 71 (FIG. 3) are adapted to orient themselves with their respective axes of symmetry parallel to the slots 73 and 74.
  • the barrel 10 (FIG. 1) is rotated together with the shaft 12 between the arms 13 and 14 of the fork 15 by means of the gear 16.
  • the gear 16 rotates the shell 31 through the medium of the projection or driving element 59 and the corresponding recess or driven element 67 of the side portion 33.
  • the terminal portion 54 of the shaft 12 rotates in particular in the bushing 9 without any sliding action between the bushing and the hood 71, while the terminal portion 38 rotates in the hole 57 of the pivot 17.
  • the end 51 of the wire 44 exerts a resilient force on the conical surface 42 of the shaft 12, the axial component of which force locates the shaft to the left with the face 43a of the notch 43 abutting against the part of the wire 44 which is fixed between the holes 46, as a result of which the core 53 remains inside the hollow shaft 34.
  • the row of types which renders the axis of the recess 67 (FIG. 4) parallel to the slots 73 and 74 (FIG. 3) is selected in a known manner, for example through the medium of a predetermined printing key or a suitable command element on the keyboard.
  • the knob 56 By means of the knob 56 (FIG. 1), the shaft 12 is drawn out manually in opposition to the action of the wire 44 on the conical surface 42. Having passed the base of this surface, the same spring, acting on the other surface 41, causes the shaft 12 to shift completely to the right until the face 43b of the notch 43 strikes against the length of wire fixed between the two holes 46.
  • the terminal portion 38 is withdrawn from the hole 57 of the pivot 17 and is inside the tube 34, as indicated by dashes in FIG. 1.
  • the core 53 is located similarly shifted to the right and in correspondence with the slots 73 and 74, so that the shaft 12 is no longer supported by the fork 15.
  • the barrel 10 remains centered on its support owing to the stop action exerted by the corresponding support stops and counterstops comprising the curved portion of the recess 67 and the hood 71 on the curved portion 63 of the projection 59 and on the projecting portion of the bushing 69, respectively.
  • the barrel 10 can now be raised vertically by means of the knob 56 by causing the core 53 to slide along the slot 74 until said barrel 10 is completely removed from the forked support 15. This operation can therefore be performed with only two fingers and in a very short time, without touching the barrel 10 with the fingers and without exerting any strain on the selector mechanisms.
  • the barrel 10 is arranged parallel to the axis of the pivot 17 and of the bushing 69 by means of the knob 56 with the knob 56 on the same side as the slot 74. Still through the medium of the knob 56, the barrel 10 is then rotated until the axis 68 (FIG. 4) of the recess 67 is rendered approximately parallel to the axis of the projection 59, after the gear 16 has been arranged before in the dismantling position in the manner already stated.
  • the barrel 10 (FIG.
  • a bevel gear or a toothed pulley mechanism could be used for the rotation of the barrel 10.
  • the two arms 13 and 14 of the support 15 may both be slotted together with the gear 16.
  • the barrel 10 may rotate on one or two shafts or sleeves which are slidable in the barrel and are positioned by an axial spiral spring. in the case of two sleeves, these are not removable, but are in turn provided with one or two slots to permit withdrawal of the barrel from the slots of the arms of the fork.
  • the shaft 12 may be connected to the barrel 10 either by means of a screw and female thread or by means of a bayonet joint.
  • a removable type head device for a printing mechanism comprising,
  • shaft means supporting said type head, said shaft means being axially movable with-respect to said type head between a first position wherein portions of said shaft means extend outwardly on both sides of said type head and a second position axially offset from said first position, said shaft means further including'a portion of reduced diameter
  • a type head support having a pair of spaced opposed arms closely confining said type head therebetween, each of said arms being provided with a shaft support engagable with said outwardly extending portions of said shaft means when said shaft means is in said first position, one of said shaft supports comprising a radial slot having a width greater than the diameter of said reduced portion of said shaft means but less than the diameter of the remainder of said shaft means, said reduced portion of said shaft means-registering with said slot when said-shaft means is in said second position,
  • a knob attached to one of said extended portionsof said shaft means for shifting said shaft means between said positions and for moving said shaft means laterally when said shaft means is in said sec end position to facilitate removal of said shaft means from said supports, and
  • selecting means for selectively rotating said type head including gear means rotatable on said head support, a driving element rotatable synchronously with said gear means and a driven element rotatable synchronously with said type head, said driving element and said driven element being mutually engageable under the control of said knob for particularly positioning said type head with said gear means on assembling said type head on said support.
  • a type head device according to claim 1 wherein said driving element is integral with said gear means and said driven element is integral with said type head,
  • the other said shaft support rotatably supports said gear means and comprises an opening receiving the other of said extended portions when said shaft means is in said first position, said other extended portion being disengaged from said opening when said shaft means is in said second position.
  • the type head device of claim 1 further comprising stop means supported by said type head limiting the extent of axial movement of said shaft means to define said positions, and spring means also supported by said type head urging said shaft means toward each of said positions during at least the final stages of movement toward said positions.
  • a type head device further comprising support stops carried by the sides of said type head, and counterstops carried by said opposed arms and positioned to engage said support stops when said shaft means is moved to said second position, whereby said stops and counterstops support said type head when said shaft means is moved to said second position.
  • said counterstops comprise said projection of said gear and a second projection fixed on said support arm opposite said gear, and second projection being also slotted in a position corresponding to said radial slot, whereby said shaft may be moved laterally past said second projection when said shaft is in said second position.
  • the type head device of claim 1 further comprising a radial recess in said type head and a driven gear rotatably mounted on one of said arms and having a projection engaging said recess to drive said type head in rotation, said projection and said recess being correspondingly outwardly tapered to facilitate alignment for engagement when said type head is being installed.
  • a type head device wherein said gear means is rotatable on one of said arms, and said driving element is integral with said gear means, said driven element being angularly fast to said type head and said shaft means being coaxial to said gear means.
  • a type head device wherein said driving element is integral with a side of said gear means and said driven element is integral with a side of said type head, said driving element and said driven element comprising mutually engageable shoulder surfaces parallel to said slot for a predetermined position of said gear means.
  • a removable type head device for a printing mechanism comprising,
  • shaft means supporting said type head, said shaft means being axially movable with respect to said type head between a first position wherein portions of said shaft means extend outwardly on both sides of said type head and a second position axially offset from said first position, said shaft means further including a portion of reduced diameter
  • a type head support having a pair of spaced opposed arms closely confining said type head therebetween, each of said arms being provided with a shaft support engageable with said outwardly extending portions of said shaft means when said shaft means is in said first position, one of said shaft supports comprising a radial slot having a width greater than the diameter of said reduced portion of said shaft means but less than the diameter of the remainder of said shaft means, said reduced portion of said shaft means registering with said slot when said shaft means is in said second position,
  • a knob attached to one of said extended portions of said shaft means for shifting said shaft means between said positions and for moving said shaft means laterally when said shaft means is in said second position to facilitate removal of said shaft means from said supports,
  • a removable type head device for a printing mechanism comprising:
  • shaft means supporting said type head, said shaft means being axially movable with respect to said type head between a first position wherein portions of said shaft means extend outwardly on both sides of said type head and a second position axially offset from said first position, said shaft means comprising a hollow shaft fixed to and extending through said type head coaxially and coextensively therewith and an inner shaft coaxial with said hollow shaft and extending slidably therethrough, said inner shaft carrying said extended portions and being slidable between said first and second positions while said type head remains fixed in position, said shaft means further comprising a reduced diameter portion carried by said inner shaft and a cam means carried by said inner shaft,
  • wire spring means carried by said hollow shaft and extending inwardly therethrough to engage said cam means, said wire spring means urging said inner shaft toward said first and second positions during at least the final stages of movement toward each of said positions,
  • stop means limiting the extent of axial movement of said inner shaft to define said first and second positions
  • a type head support having a pair of spaced opposed arms closely confining said type head therebetween, each of said arms being provided with a shaft support engageable with said outwardly extending portions of said shaft means when said shaft means is in said first position, one of said shaft supports comprising a radial slot having a width greater than the diameter of said reduced portion of said shaft means but less than the diameter of the remainder of said shaft means, said reduced portion of said shaft means registering with said shaft when said shaft means is in said second position, and
  • a knob attached to one of said extended portions of said shaft means for shifting said shaft means between said positions and for moving said shaft means laterally when said shaft means is in said second position to facilitate removal of said shaft means from said supports.
  • stop means comprises a cutout portion in said inner shaft having a pair of spaced opposed walls defining said position, said wire spring means also engaging said walls when said shaft means is in one of said positions.
  • said wire spring means comprises a single wire spring having a first portion perpendicular to said shaft means and extending through said cutout portion whereby said first portion engages one of said walls when said inner shaft is moved with respect to said hollow shaft to one of said positions, said single wire spring also having a second portion engaging said cam, and wherein said cam comprises two conical surfaces carried by said inner shaft.

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US00179042A 1970-09-16 1971-09-09 Removable typehead for a printing mechanism Expired - Lifetime US3799311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7010670 1970-09-16

Publications (1)

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US3799311A true US3799311A (en) 1974-03-26

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ID=11313451

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US00179042A Expired - Lifetime US3799311A (en) 1970-09-16 1971-09-09 Removable typehead for a printing mechanism

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US (1) US3799311A (enExample)
JP (1) JPS5411729B1 (enExample)
BE (1) BE772214A (enExample)
CA (1) CA936823A (enExample)
CH (1) CH539514A (enExample)
DE (1) DE2144693C3 (enExample)
FR (1) FR2107610A5 (enExample)
GB (1) GB1358858A (enExample)
SE (1) SE368683B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314770A (en) * 1979-01-12 1982-02-09 Aktiebolaget Electrolux Detachable connection assembly for a printing element in an electric office machine
US4381896A (en) * 1980-10-20 1983-05-03 Centronics Data Computer Corporation Print head mounting assembly with form adjustment

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US525916A (en) * 1894-09-11 Attachment for type-writing machines
US1217436A (en) * 1915-07-15 1917-02-27 L C Smith & Bros Typewriter Company Type-writer platen-release mechanism.
US1319428A (en) * 1919-10-21 Paper-peeding mechanism
DE322750C (de) * 1920-07-07 Hermann Wasem Auswechselbare Schreibwalze
US1877563A (en) * 1930-12-23 1932-09-13 Underwood Elliott Fisher Co Typewriting machine
US3347159A (en) * 1964-12-31 1967-10-17 Potter Instrument Co Inc Adjustable quick-release mechanism for print drum
US3348649A (en) * 1965-10-19 1967-10-24 Int Standard Electric Corp Spherical type carrier apparatus and bearing yoke therefor
US3420350A (en) * 1966-09-03 1969-01-07 Grundig Emv Type head driving means employing flexible belt
US3625331A (en) * 1968-06-20 1971-12-07 Triumph Werke Nuernberg Ag Type head positioning apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL212217A (enExample) * 1955-11-17
US2969864A (en) * 1959-08-24 1961-01-31 Ibm Attachment for print head

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US525916A (en) * 1894-09-11 Attachment for type-writing machines
US1319428A (en) * 1919-10-21 Paper-peeding mechanism
DE322750C (de) * 1920-07-07 Hermann Wasem Auswechselbare Schreibwalze
US1217436A (en) * 1915-07-15 1917-02-27 L C Smith & Bros Typewriter Company Type-writer platen-release mechanism.
US1877563A (en) * 1930-12-23 1932-09-13 Underwood Elliott Fisher Co Typewriting machine
US3347159A (en) * 1964-12-31 1967-10-17 Potter Instrument Co Inc Adjustable quick-release mechanism for print drum
US3348649A (en) * 1965-10-19 1967-10-24 Int Standard Electric Corp Spherical type carrier apparatus and bearing yoke therefor
US3420350A (en) * 1966-09-03 1969-01-07 Grundig Emv Type head driving means employing flexible belt
GB1191738A (en) * 1966-09-03 1970-05-13 Triumph Werke Nuernberg Ag A Type Carrier for Typewriting or Similar Machines
US3625331A (en) * 1968-06-20 1971-12-07 Triumph Werke Nuernberg Ag Type head positioning apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314770A (en) * 1979-01-12 1982-02-09 Aktiebolaget Electrolux Detachable connection assembly for a printing element in an electric office machine
US4381896A (en) * 1980-10-20 1983-05-03 Centronics Data Computer Corporation Print head mounting assembly with form adjustment

Also Published As

Publication number Publication date
JPS5411729B1 (enExample) 1979-05-17
BE772214A (fr) 1972-01-17
SE368683B (enExample) 1974-07-15
CA936823A (en) 1973-11-13
GB1358858A (en) 1974-07-03
DE2144693B2 (de) 1981-05-21
DE2144693A1 (de) 1972-03-23
DE2144693C3 (de) 1982-01-14
CH539514A (it) 1973-07-31
FR2107610A5 (enExample) 1972-05-05

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