US3646826A - Stepping device - Google Patents

Stepping device Download PDF

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Publication number
US3646826A
US3646826A US25944A US3646826DA US3646826A US 3646826 A US3646826 A US 3646826A US 25944 A US25944 A US 25944A US 3646826D A US3646826D A US 3646826DA US 3646826 A US3646826 A US 3646826A
Authority
US
United States
Prior art keywords
ratchet wheel
projection
pawl
teeth
shank
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
US25944A
Other languages
English (en)
Inventor
Rolf Ake Sahlgren
B Ingvar Wiljanen
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US3646826A publication Critical patent/US3646826A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H27/00—Step-by-step mechanisms without freewheel members, e.g. Geneva drives
    • F16H27/02—Step-by-step mechanisms without freewheel members, e.g. Geneva drives with at least one reciprocating or oscillating transmission member
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/04—Design features of general application for driving the stage of lowest order
    • G06M1/041—Design features of general application for driving the stage of lowest order for drum-type indicating means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/04—Design features of general application for driving the stage of lowest order
    • G06M1/041—Design features of general application for driving the stage of lowest order for drum-type indicating means
    • G06M1/044—Design features of general application for driving the stage of lowest order for drum-type indicating means with escapements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1553—Lever actuator
    • Y10T74/1555—Rotary driven element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2136—Pivoted pawls
    • Y10T74/214—Multiple tooth

Definitions

  • the pawl is forked or bifurcated to form [30] Fme'gn Apphcamm Pnomy Dam shanks on diametrical opposite sides of the ratchet wheel, Apr. 23, 1969 Sweden ..5777/69 ich hanks are each provided with a projection cooperating with the teeth of the ratchet wheel. A least one of the shanks is [52] US. Cl ..74/ 142, 74/577 M Provided with another Projection Situated a! circumfefemial 511 Im. Cl.
  • the present invention relates to a stepping device for a comptometer provided with ratchet wheel and pawl, and more particularly to a comptometer in which an oscillating or reciprocating movement of the pawl is changed to a unidirectional rotary movement of the ratchet wheel.
  • the purpose of the present invention is to eliminate said drawbacks and to achieve a stepping device at which wedging between the ratchet wheel and the pawl is prevented and the position of the ratchet wheel after a completed stepping is well defined.
  • FIG. 1 is a diagrammatic elevational view of a stepping device according to the invention in its rest position
  • FIG. 2 is a fragmentary view of FIG. 1 in intermediate operational position upon energization of the magnet coil of the device;
  • FIG. 3 is a similar fragmentary view in a further advanced operational position
  • FIG. 4 is a similar fragmentary view in an operational position upon deenergization of the magnet coil.
  • FIG. 1 a comptometer is shown, parts which have no direct connection with the invention, are only schematically indicated.
  • a magnet coil 1 when energized causes attraction of an armature 2 with a projection 3 which interlocks with one end of a lever-formed pawl 4.
  • the pawl is revolving around an axis of rotation 5 which according to the example is common to the drive gear 6 of the comptometer but may consist of a fulcrum pin.
  • the other end of the pawl is bifurcated to form two shanks or forks 7 and 8 of which are situated on diametrically opposite sides of a ratchet wheel 9 which according to the example is arranged on the same axis 10 as the digit wheel 11 of the comptometer.
  • the pawl need not necessarily be open at its end but may consist of a closed ring-shaped part, as is marked by broken lines, of and when construction points of views or 12 is qualities of the material make it advisable.
  • a spring is fastened between a bracket 13 on the magnet coil and the pawl 4.
  • the shanks of the pawl are each provided with two inwardly extending projections l4, l5 and l6, 17 respectively which are positioned to make engagement with the teeth of the ratchet wheel to turn the ratchet wheel.
  • FIG. I shows the arrangement in its rest position. When the magnet works the pawl is turned upwards compared with the position shown in FIG.
  • FIG. 2 shows the position where the pawl during the upward movement of the pawl has come in contact with a tooth 20 of the ratchet wheel.
  • the ratchet wheel is turned clockwise until another tooth 28 of the ratchet wheel counted counterclockwise is in contact with the projection 17 also on the shank 8 of the pawl.
  • This position is indicated in FIG. 3.
  • This figure also shows that the projections never fully occupy the spaces between adjacent teeth of the ratchet wheel. The ratchet wheel is retained in this position as long as the magnet attracts armature 2.
  • the circumferential distance between the projections 16 and 17 is chosen in such a manner, that the distance is larger than a gear pitch of the ratchet wheel in order to make possible that while the projection 16 bears against the opposite blank of the tooth 20 counted in the counterclockwise direction, the other projection 17 bears against the flank of the tooth 28 as the wheel 9 is turned in the clockwise direction of rotation. In this manner it is assured that when the projection 17 is engaged, the ratchet wheel stops in a well-defined position. Simultaneously the resultant of the forces which occur at the respective contact points of the ratchet wheel, is directed in such a manner, that it extends roughly through the axis of rotation 10 of the ratchet wheel.
  • a stepping device for converting a linear reciprocating movement to a unidirectional rotary movement, said stepping device comprising:
  • a pivotally mounted two-armed pawl one arm of said pawl constituting an armature arranged to be attracted by said electromagnetic means upon energization thereof thereby effecting a linear movement of said arm by pivoting the pawl, the other arm of the pawl being bifurcated thereby forming two shanks, said shanks being curved and positioned to encompass at least partly the outer peripheral outline of said ratchet wheel radially spaced apart therefrom, each of said shanks having thereon an inwardly protruding first projection engageable with valleys between the teeth of the wheel and one of said shanks having thereon a second inwardly protruding projection also engageable with valleys between the teeth of the wheel, the first and the second projection on said one shank being disposed at a circumferential spacing such that in response to successive attractions and releases of the armature said first projection engages the counterclockwise facing flank of successive teeth thereby causing incremental clockwise turning of the ratchet wheel and after turning of said wheel into a
  • a return spring means attached to the pawl and biased to pivot the pawl in counterclockwise direction, said pivotal movement of the pawl causing engagement of the projection on the other shank with the counterclockwise facing flank of a tooth upon deenergization of the electromagnetic means thereby turning the ratchet wheel in clockwise direction.
  • a second projection is provided on said other shank also, said second projection being correlated with the first projection on the other shank so that both said projections on the other shank simultaneously engage oppositely facing flanks of teeth in a second predetermined angular position of the ratchet wheel thereby locking the wheel in said second angular position, the first and second projection on said other shank being so disposed that the forces simultaneously applied to the flanks of the respective two teeth also extend approximately through the rotational axis of the ratchet wheel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Transmission Devices (AREA)
  • Specific Conveyance Elements (AREA)
US25944A 1969-04-23 1970-04-06 Stepping device Expired - Lifetime US3646826A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05777/69A SE333855B (xx) 1969-04-23 1969-04-23

Publications (1)

Publication Number Publication Date
US3646826A true US3646826A (en) 1972-03-07

Family

ID=20267213

Family Applications (1)

Application Number Title Priority Date Filing Date
US25944A Expired - Lifetime US3646826A (en) 1969-04-23 1970-04-06 Stepping device

Country Status (11)

Country Link
US (1) US3646826A (xx)
BE (1) BE749378A (xx)
DE (1) DE2018840C3 (xx)
DK (1) DK126060B (xx)
FI (1) FI50455C (xx)
FR (1) FR2039417A1 (xx)
GB (1) GB1258861A (xx)
NL (1) NL7005117A (xx)
NO (1) NO127423B (xx)
SE (1) SE333855B (xx)
SU (1) SU380034A3 (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802282A (en) * 1971-10-13 1974-04-09 English Numbering Machines Rotary index mechanisms
US3969945A (en) * 1973-10-03 1976-07-20 Svenska Dataregister Ab Indexing mechanism

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229096A (en) * 1978-12-26 1980-10-21 Pitney Bowes Inc. Countdown and start mechanism for an electrostatic copier
US4245504A (en) * 1979-04-16 1981-01-20 The Singer Company One-way index for gas meters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US48927A (en) * 1865-07-25 Improvement in registers for counting revolutions
US390494A (en) * 1888-10-02 Lawn-mower

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US48927A (en) * 1865-07-25 Improvement in registers for counting revolutions
US390494A (en) * 1888-10-02 Lawn-mower

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802282A (en) * 1971-10-13 1974-04-09 English Numbering Machines Rotary index mechanisms
US3969945A (en) * 1973-10-03 1976-07-20 Svenska Dataregister Ab Indexing mechanism

Also Published As

Publication number Publication date
DE2018840A1 (de) 1971-07-22
DE2018840C3 (de) 1975-02-27
GB1258861A (xx) 1971-12-30
NO127423B (xx) 1973-06-18
FR2039417A1 (xx) 1971-01-15
FI50455B (xx) 1975-12-01
NL7005117A (xx) 1970-10-27
SE333855B (xx) 1971-03-29
DE2018840B2 (de) 1974-07-18
BE749378A (fr) 1970-10-01
SU380034A3 (xx) 1973-04-20
DK126060B (da) 1973-06-04
FI50455C (fi) 1976-03-10

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