US3583542A - Tabular rack assembly - Google Patents
Tabular rack assembly Download PDFInfo
- Publication number
- US3583542A US3583542A US745295A US3583542DA US3583542A US 3583542 A US3583542 A US 3583542A US 745295 A US745295 A US 745295A US 3583542D A US3583542D A US 3583542DA US 3583542 A US3583542 A US 3583542A
- Authority
- US
- United States
- Prior art keywords
- wall
- stops
- stop
- tab
- elongate
- 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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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
- B41J21/00—Column, tabular or like printing arrangements; Means for centralising short lines
- B41J21/02—Stops or stop-racks
Definitions
- a typewriter tabular rack is provided with tab stops held in frictional engagement with a rack element in either set or reset positions by, in one embodiment, the compressional stresses set up in a resilient stop mounting strip. The strip also serves to maintain the tab stops properly spaced and as a fulcrum when the stops are moved between set and reset positions. In another embodiment flexure stresses set up in the tab stops when mounted on a rack element serve to provide the force urging the tab stops into frictional engagement with a rack element.
- This invention relates to tabular rack assemblies for typewriters or like machines; more particularly it relates to tabular rack assemblies characterized by tab stops which non detentably frictionally engage a rack element; and specifically the invention relates to a tabular rack wherein the forces resulting in the frictional engagement of the tab stop with a rack element are provided by stresses set up in a resilient tab stop fulcrum when the rack is assembled.
- Nondetenting tab stop assemblies provided in the prior art which rely on friction to hold tab stops positioned in set and reset or clear status are not altogether satisfactory in that the structures required to provide the friction necessary to reliably maintain tab stops positioned are subject to wear, are costly to fabricate and difficult to assemble.
- Tabular racks having viscous materials to provide resistance to unwanted stop movement are in use. These racks are characterized by tab stops having relatively large surface areas in contact with the viscous material to provide sufficient resistance and the viscous materials such as grease are subject to loss and contamination.
- a resilient tab stop anchoring strip is trapped and compressed between a contoured edge of a tab stopand a surface of the tab rack assembly whereby the compressional force urges a peripheral edge of the tab stop opposite the contoured edge into frictional engagement with another surface of the tab rack assembly.
- a generally C-shaped tab stop encircles, in turn, a support rod, one side of an elongated channel-shaped slotted guide bar and the resilient strip; the compressional force set up in the strip serves to urge the tab stop into frictional engagement with the support rod.
- a channel-shaped slotted guide barencloses the tab stops and a rubber or resilient strip and the compressional force set up in the rubber serves to urge the tab stop into frictional engagement with an opposite guide bar surface.
- flexure forces set up incident to mounting a C-shaped tab stop about a support rod and one leg of a channel-shaped guide bar by anchoring the stop to the bar and forcing it about the rod urge the tab stop into frictional engagement with the support rod.
- extensions of the tab stops project through slots in the guide bar.
- a feature of the embodiments utilizing rubber strip mounting resides in the fact that deformation of the rubber between adjacent tab stops acts to maintain the tab stops properly spaced.
- An object of the invention is to provide a low-cost nondetenting type tab rack assembly.
- Another object of the invention is in the provision of a nondetenting tab rack assembly wherein tab stops are urged into frictional engagement against a guide bar by the compressional forces set up in a resilient strip incident to mounting the tab stops in the assembly.
- Still another object of the invention is in the provision of a rubber tab stop anchoring strip to provide the force necessary to maintain tab stops positioned through friction and wherein the flow of rubber between tab stops provides the necessary support to maintain the tab stops aligned.
- a further object of the invention is to provide a tab rack assembly wherein all set stops may be cleared solely by manipulation of the tab rack assembly.
- FIG. 2 is a cross-sectional view of another embodiment similar to that ofFIG. 1;
- FIG. 3 is a partial perspective view of a tab rack assembly in accordance with a further embodiment ofthe invention.
- FIG. 4 is a partial perspective view of still another embodiment of the tab rack assembly.
- FIG. 1 a preferred embodiment of a tab rack assembly generally designated by reference numeral 10 which mounts an array of tab stops ll positionable to set 118 and reset 11R or clear positions.
- Set and reset abutments designated S and R are associated with the tab rack assembly as is a tab blade or sensing element 12.
- the tab rack assembly 10 may be utilized with conventional typewriters having a carriage movable relative to a fixed printing point, in which case the assembly 10 would be mounted on the carriage frame, and the abutments R and S and blade 12 on the machine frame with tabular movement of the assembly 10 in the direction of arrow 13, or it may be utilized with machines wherein a single printing element is mounted on a carriage, in which case the tab rack assembly 10 will be rockably mounted in the typewriter machine frame and the abutments R and S and tab blade 12 on the printing element carriage whose tab movement would be in the direction of arrow 14.
- the reference character F represents either a machine or a carriage frame
- a tabulation function releases the carriage from its escapement and places the normally retracted tab blade 12 in position to intercept or be intercepted by a set tab stop 185.
- a latch mechanism maintains this status until a set stop 185 and tab blade 12 encounter one another, tripping the latch and allowing reengagement of the carriage with its escapement.
- the tab stops 11S absorb carriage energy and arrest the carriage.
- the reengagement of the carriage escapement arrests carriage motion.
- the rack assembly 10 of FIG 1 comprises a transverse support rod 15 whose ends are suitably journaled in side frames F for rocking movement in either set or reset directions from a neutral normal operative position in response to manipulation of a tab set and clear key, operative on a crank arm (not shown) secured to one end of the support rod 15.
- the tab rack assembly 10 also comprises a transverse guide bar generally designated by reference numeral 16 and which is generally C- or channel-shaped in cross section having from left to right as viewed in FIG. 1 a circularly shaped upwardly directed section or wall 16a to accommodate the circular sup port rod 15, a downwardly and forwardly extending section 16b and a vertically extending section provided with slots 17 at carriage position intervals to accommodate tab stop extensions 18 projecting through slots 17.
- An elongated resilient rubber strip 19 is positioned against the outer periphery of the circular section 16a, and, with the support 15 rod, sandwiches the circular guide bar section 16a. The strip 19 serves to anchor and fulcrum the tab stops 11 and to urge them into frictional engagement with the support rod 15. More particularly each tab stop 11 in FIG.
- the forward edge 22 has a retaining projection 23 so that when the rear edge 21 is placed against the rubber strip 19, and the strip 19 is compressed, the forward edge 22 may be forced about and encircle the support rod 15 with the compressional force set up in the rubber strip 19, urging edge 22 into frictional engagement-with rod 15.
- the friction between the forward edge 22 of the cutout 20 and the periphery of the support rod 15 serves to hold the stops 11 positioned in either set or reset position the.
- FIG. 2 employs a guide bar support 16 and rod 15 configuration identical to that of FIG. I.
- the tab stops II in this embodiment differ in that the rear edge of the cutout formed in each tab stop 11 is formed with a forwardly directed tooth having a sharp point 32 and the distance between point 32 and the forward edge 22' of the cutout 20 is less than the diameter of the support rod 15 plus the guide bar thickness at the section 16a.
- FIG. 3 there is shown another tab rack as sembly generally designated by reference numeral 33 characterized by a modified Cshaped slotted guide bar generally designated by reference numeral 34, such guide bar having a vertically disposed rear section 35, an arcuate forward section 36 provided with slots 37 and a horizontal lower section or wall 38 joining the rear section 35 and forward section 36.
- the tab stops 39 in this embodiment are formed with a contoured rear edge 41 and with a body that increases in width in the forward direction.
- the forward edge 42 is arcuate and complimentary to the inner surface of the guide bar arcuate section 36 and tab stop extensions 43 project through the slots 37 in the arcuate section 36.
- the rear edges 41 are curved and anchored in a rubber strip 44 adjacent the inner side of the rear section 35 and the compressional force set up in the rubber strip 44 urges the forward edge 42 of the tab stops 39 into frictional engagement with the inner surface of the arcuate section 36. Again rubber deformation maintains the rear ends M of the stops 39 spaced and aligned.
- End stops 45 are formed with tabs 46 complimentary to notches 47 cut in the ends of the guide bar 34 and stub shafts 48, secured as by welding to the end stops 45, are journaled in Frame F.
- all stops 39 in set position may be cleared by calling for relative movement between abutments R and S and tab rack 33 assembly in a carriage return direction (opposite arrows 13 or 14 as the case may be) while holding the clear key depressed to rock the tab rack 33 assembly clockwise whereby set stops 398 will be cammed upwardly by the reset abutment R as they pass relative to the abutment R.
- FIG. 4 shows another embodiment there is provided a channel-shaped guide bar generally designated by reference numeral 50 which has an arcuate forwardly facing wall or section 51 provided with guide slots 52 and upper and lower rearwardly extending walls or sections 53 and 54.
- each tab stop 49 in the array of FIG. 4 has a central circular opening 56 through which a support rod 57 freely extends.
- the rear edge 58 of each stop 49 is circular and the forward edge 59 is arcuately shaped complimentary to the inner surface of the forward section of the guide bar 50 and has an extension or tongue 61 which projects from the forward edge through slot 52 in the guide bar 50.
- the rear ends of the stops 49 are frictionally anchored in a rubber strip 62 held by a backing plate 63 which is held to the assembly by slitting and crimping over tabs 64 so formed on the guide bar 50.
- End stops 55 are keyed to and are rotated with the support rod 57. They are further shaped to conform to the inner periphery of the guide bar 50 and thus serve to rotate the guide bar 50.
- the FIG. 4 modification is functionally the same as the FIG. 3 embodiment.
- Assembly of the FIG. 3 modification may be accomplished by first inserting the tab stop extension 43 through the slots 37 in the guide bar 34, the latter resting with its arcuate section 36 in a slotted fixture designed to locate the stop extensions 43 projecting through and hold them aligned. After positioning the rubber strip 44, the rear wall section 35 of the guide bar 34 is then bent forwardly to the final assembly position shown trapping strip 44 and stops 39.
- Assembly of the FIG. 4 modification may be accomplished in a substantially similar fashion.
- stops having generally C-shaped cutouts facilitating their association with the stop-supporting structure so that said elongate means is situated in said cutouts, said stops having stop ends extending through said guiding slots and having each a sharp point in its cutout by which it has pivotal anchorage contact with said first face,
- each stop having in its C-shaped cutout a face concentric to its pivotal anchorage contact with said first face, the relative locations of the faces on said elongate means being such as to strain the stops in the region of said cutouts to render the stops movable between set and unset positions against frictional resistance.
- a stop-supporting rack assembly comprising,
- a stop-supporting structure having an elongate first wall and having an elongate second wall being transversely spaced from said first wall and extending parallel thereto,
- said first wall having a row of slots extending transversely therethrough in the direction in which said walls are spaced
- said first wall being curved transversely of its length about an axis situated between said two walls
- the slots in said first wall being of lengths to permit setting movements of said stops and the tongues about said axis location, each of said stops having an edge in contact with the curved wall beyond each of the opposite ends of the related slot,
- said means comprising a resiliently compressible member situated between said second wall and the anchorage ends of said stops to urge said stop edges thereon against said curved surface beyond the opposite ends of the slots, whereby said stops are frictionally held in the positions to which they are moved.
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Abstract
Description
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US74529568A | 1968-07-16 | 1968-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3583542A true US3583542A (en) | 1971-06-08 |
Family
ID=24996091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US745295A Expired - Lifetime US3583542A (en) | 1968-07-16 | 1968-07-16 | Tabular rack assembly |
Country Status (1)
Country | Link |
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US (1) | US3583542A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3871508A (en) * | 1973-03-21 | 1975-03-18 | Facit Halda Aktiebolag | Tabular device for an office machine |
US4381156A (en) * | 1980-07-11 | 1983-04-26 | Tokyo Juki Industrial Co., Ltd. | Tab setting device of typewriter |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1066053A (en) * | 1911-05-10 | 1913-07-01 | Underwood Typewriter Co | Type-writing machine. |
US1247084A (en) * | 1916-05-27 | 1917-11-20 | Underwood Typewriter Co | Type-writing machine. |
US2146821A (en) * | 1936-04-16 | 1939-02-14 | Underwood Elliott Fisher Co | Typewriting machine |
US2265483A (en) * | 1940-06-28 | 1941-12-09 | L C Smith & Corona Typewriters | Typewriting machine |
DE745564C (en) * | 1941-04-18 | 1944-03-16 | Adlerwerke Kleyer Ag H | Determination of the setting tab |
US2547443A (en) * | 1947-12-13 | 1951-04-03 | Ibm | Carriage positioning mechanism |
US2852120A (en) * | 1956-09-19 | 1958-09-16 | Royal Mcbee Corp | Tabulator stop assembly |
US3283872A (en) * | 1964-06-03 | 1966-11-08 | Royal Typewriter Co Inc | Tabular stop assembly |
US3294213A (en) * | 1963-11-26 | 1966-12-27 | Facit Halda Aktiebolag | Tabulating mechanism for typewriters and like machines |
US3333669A (en) * | 1965-03-26 | 1967-08-01 | Ibm | Tabulation rack |
-
1968
- 1968-07-16 US US745295A patent/US3583542A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1066053A (en) * | 1911-05-10 | 1913-07-01 | Underwood Typewriter Co | Type-writing machine. |
US1247084A (en) * | 1916-05-27 | 1917-11-20 | Underwood Typewriter Co | Type-writing machine. |
US2146821A (en) * | 1936-04-16 | 1939-02-14 | Underwood Elliott Fisher Co | Typewriting machine |
US2265483A (en) * | 1940-06-28 | 1941-12-09 | L C Smith & Corona Typewriters | Typewriting machine |
DE745564C (en) * | 1941-04-18 | 1944-03-16 | Adlerwerke Kleyer Ag H | Determination of the setting tab |
US2547443A (en) * | 1947-12-13 | 1951-04-03 | Ibm | Carriage positioning mechanism |
US2852120A (en) * | 1956-09-19 | 1958-09-16 | Royal Mcbee Corp | Tabulator stop assembly |
US3294213A (en) * | 1963-11-26 | 1966-12-27 | Facit Halda Aktiebolag | Tabulating mechanism for typewriters and like machines |
US3283872A (en) * | 1964-06-03 | 1966-11-08 | Royal Typewriter Co Inc | Tabular stop assembly |
US3333669A (en) * | 1965-03-26 | 1967-08-01 | Ibm | Tabulation rack |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3871508A (en) * | 1973-03-21 | 1975-03-18 | Facit Halda Aktiebolag | Tabular device for an office machine |
US4381156A (en) * | 1980-07-11 | 1983-04-26 | Tokyo Juki Industrial Co., Ltd. | Tab setting device of typewriter |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TRIUMPH-ADLER NORTH AMERICA, INC., 500 DAY HILL RO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROYAL BUSINESS MACHINES, INC.;REEL/FRAME:004509/0292 Effective date: 19860110 |
|
AS | Assignment |
Owner name: TRIUMPH-ADLER AG, FURTHER STRASSE 212, POSTFACH 49 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.,;REEL/FRAME:004587/0403 Effective date: 19860730 |
|
AS | Assignment |
Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, GERMANY Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570 Effective date: 19860730 Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, FURTHER STRAS Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570 Effective date: 19860730 |