US3393789A - Platen having molded tubular portion, end wall and ratchet - Google Patents

Platen having molded tubular portion, end wall and ratchet Download PDF

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Publication number
US3393789A
US3393789A US626505A US62650567A US3393789A US 3393789 A US3393789 A US 3393789A US 626505 A US626505 A US 626505A US 62650567 A US62650567 A US 62650567A US 3393789 A US3393789 A US 3393789A
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United States
Prior art keywords
platen
shaft
carrier
end wall
tubular portion
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
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US626505A
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English (en)
Inventor
Keiter Alfred
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.)
Olympia Werke AG
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Olympia Werke AG
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Filing date
Publication date
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Publication of US3393789A publication Critical patent/US3393789A/en
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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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/02—Platens
    • B41J11/04—Roller platens

Definitions

  • VEN TOR BY Ssm'w A TTORNE Y July v23, 1968 A. KEITER 3,393,789
  • the tubular portion of the carrier is surrounded by an elastic cylindrical backstop and its interior is providedv with stiffening ribs which engage the shaft to center the backstop,
  • the carrier is molded onto or otherwise formed directly on the shaft, and its end wall has an internal annular collar which extends into a complementary groove of the shaft to hold it against axial movement.
  • the present invention relates to platens for'typewriters, calculating machines and like machines wherein types are caused to strike against an elastic backstop.
  • the invention further relates to a method of producing a platen.
  • Presently known platens for typewriters or calculating machines comprise a sleeve which is connected with the platen shaftkby twovannular flanges, and one of these anges is pinned or boltedA to a platen ratchet which cooperates with a customary line space pawl.
  • the ratchet and the flanges are provided with registering bores for the shaft.
  • Washer-like retainers are provided at the outer sides ofthe ratchet and the other collar to hold the collars and the ratchet in selected axial positions.
  • the sleeve is normally glued or screwed to the collars and is telescoped into a customary cylindrical backstop which consists of elastomeric material and takes up the impact of type in response to depression of keys.
  • a lconventional platen comprises a minimum of six separately produced partsl plus a number of screws, pins, bolts and other auxiliary components which are used to fix the collars, the ratchet Iand the retainers on the shaft. Additional expenses a'r'ise in connection with storing, sorting, testing, transporting, cataloguing, maintenance and other processing of the aforedescribed parts. Space parts must be available at the manufacturing plant as well as in the repair shop and must be carried along by repairmen. Additional costs arise in connection with bookkeeping and other work to keep track of spare parts.
  • Another object of the invention is to provide a platen wherein the ratchet need not form a separate component part yand wherein the ratchet may be permanently secured to the shaft.
  • a further object of the invention is to provide a platen wherein the number of component parts is but a small fraction of component parts in presently known platens for typewriters or the like.
  • An additional object of the invention is to provide a platen wherein all component parts form -an integral unit and which can be used as a inexpensive and superior substitute for presently known platens.
  • a concomitant object of the invention is to provide a novel method of producing a platen.
  • yAnother object of the invention is to provide a method according to which the shaft need not be bolted, screwed, or analogously fastened to the remaining component parts of the platen.
  • One feature of the present invention resides in the provision of a method of assembling platens for typewriters or the like wherein a shaft is surrounded by a substantially bell-shaped carrier having an annular end wall provided with an integral platen ratchet.
  • the method comprises forming the carrier of a single piece of synthetic plastic or metallic material in a mold wherein the shaft is received in the mold cavity so that, after the material sets, the carrier is permanently connected with the shaft, and applying an elastic cylindrical backstop around the carrier.
  • the shaft is preferably provided with one or more annular grooves and a portion of the material of the end wall of the carrier is forced into such groove or grooves prior to setting so that the material filling the groove or grooves forms one or more internal collars or projections which prevent axial movement of the carrier and backstop with reference to the shaft or vice versa.
  • the carrier is formed with internal stiffeners in the form of ribs or rails which extend inwardly from its tubular portion and engage the shaft to center the backstop.
  • At least one terminal portion of the shaft may be provided with a platen knob, preferably by introducing the one terminal portion into a mold and admitting into the mold synthetic plastic material which, after setting, forms the platen knob. The terminal portion may be milled or knurled prior to formation of the knob.
  • FIG. 1 is a substantially -axial section through a platen which embodies one form of my invention, the section being taken along the line I-I of FIG. 4;
  • FIG. 2 is an end elevational View of the platen as seen from the right-hand side of FIG. 1;
  • FIG. 3 is an axial section through the platen substantially as seen in the direction of arrows from the line III-III of FIG. 4;
  • FIG. 4 is an end elevational view of the platen as seen from the left-hand side of FIG. 1;
  • FIG. 5 is a perspective view of the platen, portions of the carrier and of the backstop being broken away.
  • the improved platen 1 comprises an elongated shaft 7 having two terminal portions 9 and 12.
  • the terminal portion 12 is knurled or milled and can be non-rotatably introduced into an internally splined platen knob which is not shown in the drawing.
  • the terminal portion 12 may be introduced into a suitable mold and a mass of deformable synthetic plastic material is thereupon introduced into the mold cavity to form, after setting, a knob which is permanently connected with the shaft 7.
  • the other terminal portion 9 can be knurled or milled in the same way as the terminal portion 12 and can be connected with a second platen knob.
  • the platen 1 further comprises a substantially bellshaped carrier 2 which consists of hardened synthetic plastic material and comprises a tubular portion 2b one end of which is closed by an end wall 2a having an outwardly extending portion provided with an integral platen ratchet 4.
  • the end wall 2a has an inwardly extending annular collar which is accommodated in a circumferential groove 3 of the shaft 7 so that the latter is permanently connected with the carrier 2 and is held against axial and angular movement with reference to the end wall 2a.
  • the groove 8 may consist of several arcuate sections so that the collar of the end wall 2a positively prevent rotation of the carrier 2 on the shaft 7.
  • the exposed outer face of the end wall 2a is provided with an annular recess 5 which is surrounded by the ratchet 4. This recess is necessary to prevent the formation of burrs during injection and hardening of synthetic plastic material which forms the carrier 2.
  • the end wall 2a is further provided with a tubular extension 3 which extends toward the open end of the tubular portion 2b.
  • the extension 3 insures satisfactory centering of the tubular portion 2b and contributes to rigidity of the carrier 2. Furthermore, the internal surface of the extension 3 is in face-to-face abutment with the adjoining portion of peripheral surface on the shaft 7 to establish a satisfactory connection between the shaft and the carrier 2.
  • tubular portion 2b of the carrier 2 tapers in a direction toward the open end of the carrier, i.e., away from the end wall 2a.
  • This tubular portion is surrounded by an elastic cylindrical backstop 13 which may consist of rubber.
  • the tubular portion 2b of the carrier 2 is provided with inwardly extending stifleners in the form of elongated ribs 6 which extend all the way between the end wall 2a and the open left-hand end of the tubular portion 2b.
  • the ribs 6 have concave internal surfaces which abut against and follow the outline of the shaft 7 in the region between the extension 3 and the lefthand end of the tubular portion 2b. These ribs enter the backstop 13 on the shaft 7 and prevent deformation of the carrier 2.
  • the carrier 2 is provided with four parallel ribs which extend substantially radially toward the axis of the shaft 7 and are integral with the extension 3. However, the ribs 6 need not extend exactly radially of the shaft.
  • the planes of the ribs 6 may be parallel to the axis of the shaft 7 or extend substantially tangenitially of the shaft.
  • the thickness of ribs 6 decreases in a direction away from the end wall 2a.
  • terminal portions 9 and 12 of the shaft 7 are formed with additional annular grooves 11 and at least one of these terminal portions is further provided with a cylindrical bearing surface which is received in a suitable socket of the carriage in a typewriter.
  • the improved platen can be assembled of a small number of parts, namely, of the shaft 7, carrier 2, and backstop 13.
  • the step of manufacturing the carrier 2 may be combined with the step of assembling it with the shaft 7.
  • the shaft 7 may be placed into a suitable mold whose cavity is thereupon filled with synthetic plastic or metallic material to form the carrier 2 including the tubular portion 2b, end wall 2a, ratchet 4, extension 3 and ribs 6.
  • the VAresulting carrier 2 is permanently connected with the shaft 7 because some material of the end wall v2a penetrates into the groove 8 and forms an internal collar which prevents axial movements of the carrier on the shaft.
  • the inner surfaces of the ribs 6 are preferably concave and are in direct face-to-face abutment with the peripheral surface of the shaft 7.
  • the tubular portion 2b is telescoped into the cylindrical backstop 13.
  • the terminal portion 9 of the shaft 7 may be knurled or milled in the same Way as the terminal portion 12 to take a second platen knob.
  • An important advantage of the just outlined method of producing and assembling the platen 1 is that the parts 2, 7 and 13 can be connected to each other without resorting to screws, pins, washer-like retainers and analogous fastening and/ or locating devices. This simplifies the work of a repairman and reduces the number of parts which must be held in storage.
  • the platen knob can be molded directly around the terminal portion 12 of the shaft 7. However, it is equally within the purview of my invention to produce the knob in a separate operation and to slip it onto the terminal portion 12.
  • the knob can be made of the same material as the carrier 2, provided that the latter consists of a plastic whose coloring is suitable for the knob.
  • the two molding or analogous shaping operations can be carried out simultaneously.
  • a substantially bell-shaped carrier unit including a tubular portion, an annular end wall at one end of said tubular portion only and a platen ratchet on said end wall, Said tubular portion, annular end wall and platen ratchet made in one piece; a shaft coaxially received in and having terminal portions at least one of which extends beyond said carrier; and a cylindrical backstop surrounding said tubular portion of said carrier.
  • tubular portion comprises inwardly extending stiffeners which engage said shaft.

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  • Handling Of Sheets (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US626505A 1966-04-01 1967-03-28 Platen having molded tubular portion, end wall and ratchet Expired - Lifetime US3393789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEO0011558 1966-04-01

Publications (1)

Publication Number Publication Date
US3393789A true US3393789A (en) 1968-07-23

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ID=7352376

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Application Number Title Priority Date Filing Date
US626505A Expired - Lifetime US3393789A (en) 1966-04-01 1967-03-28 Platen having molded tubular portion, end wall and ratchet

Country Status (7)

Country Link
US (1) US3393789A (enrdf_load_stackoverflow)
CH (1) CH460821A (enrdf_load_stackoverflow)
DE (1) DE1561267B2 (enrdf_load_stackoverflow)
FR (1) FR1517321A (enrdf_load_stackoverflow)
GB (1) GB1179573A (enrdf_load_stackoverflow)
NL (2) NL6700958A (enrdf_load_stackoverflow)
SE (1) SE306095B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737046A (en) * 1985-06-27 1988-04-12 Inabota Techno Loop Corporation Core member for platen roll
US4759646A (en) * 1986-04-24 1988-07-26 Eastman Kodak Company Compact battery-powered printer
US4900175A (en) * 1988-04-06 1990-02-13 Citizen Watch Co., Ltd. Platen assembly
US5109687A (en) * 1991-07-08 1992-05-05 Nippon Steel Corporation Device for adjustment of barrel width of roll type straightener

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453848A (en) * 1982-05-24 1984-06-12 Florida Data Corporation Noise-reducing platen
DE3805215A1 (de) * 1988-02-19 1989-08-31 Triumph Adler Ag Verfahren zur herstellung einer kunststoffschreibwalze fuer schreib- oder aehnliche bueromaschinen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1036947A (en) * 1906-03-30 1912-08-27 Wyckoff Seamans & Benedict Type-writing machine.
US1749393A (en) * 1928-05-29 1930-03-04 Pflimlin Jules Drawing device for spinning frames and for preparing machinery
US1759192A (en) * 1927-06-02 1930-05-20 Bonnar Vawter Fanform Company Printing-press cylinder
US1804160A (en) * 1928-07-12 1931-05-05 Arthur B Froehlich Printing mechanism
US2073528A (en) * 1931-09-11 1937-03-09 Gen Electric Method of making printing rolls
US2185766A (en) * 1938-01-03 1940-01-02 Carborundum Co Printing press cylinder
US2536323A (en) * 1947-03-18 1951-01-02 Perma Flex Ind Ltd Polyvinyl chloride printing roller
US3006061A (en) * 1959-01-02 1961-10-31 Dick Co Ab Impression roller
US3184828A (en) * 1962-11-30 1965-05-25 Polymer Processes Inc Roll covers
US3293728A (en) * 1965-04-14 1966-12-27 Edward D Hill Ink applying roller and process of preparation thereof
US3300835A (en) * 1963-09-03 1967-01-31 Post Office Resilient wheels

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1036947A (en) * 1906-03-30 1912-08-27 Wyckoff Seamans & Benedict Type-writing machine.
US1759192A (en) * 1927-06-02 1930-05-20 Bonnar Vawter Fanform Company Printing-press cylinder
US1749393A (en) * 1928-05-29 1930-03-04 Pflimlin Jules Drawing device for spinning frames and for preparing machinery
US1804160A (en) * 1928-07-12 1931-05-05 Arthur B Froehlich Printing mechanism
US2073528A (en) * 1931-09-11 1937-03-09 Gen Electric Method of making printing rolls
US2185766A (en) * 1938-01-03 1940-01-02 Carborundum Co Printing press cylinder
US2536323A (en) * 1947-03-18 1951-01-02 Perma Flex Ind Ltd Polyvinyl chloride printing roller
US3006061A (en) * 1959-01-02 1961-10-31 Dick Co Ab Impression roller
US3184828A (en) * 1962-11-30 1965-05-25 Polymer Processes Inc Roll covers
US3300835A (en) * 1963-09-03 1967-01-31 Post Office Resilient wheels
US3293728A (en) * 1965-04-14 1966-12-27 Edward D Hill Ink applying roller and process of preparation thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737046A (en) * 1985-06-27 1988-04-12 Inabota Techno Loop Corporation Core member for platen roll
EP0208039A3 (en) * 1985-06-27 1989-05-10 Inabata Techno Loop Corporation Core member for platen roll
US4759646A (en) * 1986-04-24 1988-07-26 Eastman Kodak Company Compact battery-powered printer
US4900175A (en) * 1988-04-06 1990-02-13 Citizen Watch Co., Ltd. Platen assembly
US5109687A (en) * 1991-07-08 1992-05-05 Nippon Steel Corporation Device for adjustment of barrel width of roll type straightener

Also Published As

Publication number Publication date
SE306095B (enrdf_load_stackoverflow) 1968-11-18
CH460821A (de) 1968-08-15
GB1179573A (en) 1970-01-28
DE1561267A1 (de) 1971-01-14
FR1517321A (fr) 1968-03-15
NL6700958A (enrdf_load_stackoverflow) 1967-10-02
DE1561267B2 (de) 1971-09-02
NL134291C (enrdf_load_stackoverflow)

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