US3670580A - Indexing mechanisms - Google Patents

Indexing mechanisms Download PDF

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Publication number
US3670580A
US3670580A US82906A US3670580DA US3670580A US 3670580 A US3670580 A US 3670580A US 82906 A US82906 A US 82906A US 3670580D A US3670580D A US 3670580DA US 3670580 A US3670580 A US 3670580A
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US
United States
Prior art keywords
wheel
index
projections
leaf spring
indexed
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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US82906A
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English (en)
Inventor
Hans Bud
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English Numbering Machines Ltd
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English Numbering Machines Ltd
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Filing date
Publication date
Application filed by English Numbering Machines Ltd filed Critical English Numbering Machines Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06M1/042—Design features of general application for driving the stage of lowest order for drum-type indicating means with click devices
    • 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
    • Y10T74/14—Rotary member or shaft indexing, e.g., tool or work turret
    • Y10T74/1412—Rotary member or shaft indexing, e.g., tool or work turret with locating point adjusting
    • 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

  • An object of the present invention is to provide an indexing mechanism in which an index wheel when at rest may assume only one of a number of predetermined index positions and is prevented from assuming any intermediate position.
  • an indexing mechanism comprising an index wheel having a plurality of index positions, a plurality of projections corresponding in number to said index positions, said projections being spaced equally apart around a peripheral region of the wheel, a stepping pawl device mounted for back and forth movement and positioned to engage in turn the said projections to index the wheel in a forwards direction, and a leaf spring means lying tangentially to the wheel and positioned to press resiliently on said peripheral region and to act on said projections as the wheel is indexed and urge the wheel to each index position in the forwards direction as it is being indexed by the stepping pawl device, and in the event of the wheel being over indexed past an index position, to urge the wheel back to said index position.
  • an indexing mechanism comprising a plurality of index wheels each having a plurality of index positions and each having a plurality of projections corresponding in number to the index positions spaced equally apart around a peripheral region of the wheel, a stepping pawl device for each wheel mounted for back and forth movement and positioned to engage in turn the said projections to index the wheel in a forwards direction, and a leaf spring means for each wheel which lies tangentially to the wheel and is positioned to press resiliently on said peripheral region and to act on said projections as the wheel is indexed and urge the wheel to each index position in the forwards direction as it is being indexed by the associated stepping pawl device, and, in the event of the wheel being over indexed past the indexed position, to urge the wheel back to said index position.
  • a preferred embodiment of the invention consists in a counter mechanism comprising an indexing mechanism as hereinbefore defined.
  • FIG. I shows an elevation view of the mechanism
  • each number portion is numbered 0 to 9, the counter. wheels signify (from the right in FIG. 1) units, tens, hundreds, thousands and tens of thousands, from which it follows that, for example, the tens" wheel is required to rotate one step for each revolution of the units wheel. For this reason, each limb 11 (from the right of FIG. 1) is progressively shorter. From FIG. 2 it can be seen, that when the longest of the limbs 1 1 lies on the circumference of its respective drive wheel portion 3, the remaining four shorter limbs remain clear of their respective drive wheel portions.
  • the larger units limb 1 1 once again bears on the circumference of its respective drive wheel'portion 3, whilst the "tens" limb 11 is again rendered inoperative until the units number wheel has completed a further revolution.
  • the sequence is followed so that on completion of one revolution of the units" number wheel the tens number-wheel rotates through one step and on completion of one revolution of the tens wheel the hundreds number wheel is rotated through one step, and so on.
  • the actuator mechanism 7 when actuated, for example manually, is pushed by means of the extending portion of the rod 9 so that the U-shaped member-8 rotates (anti-clockwise in FIG..2) through 36.
  • the engagement member 10 is biased anticlockwise about the rod-like member 9 urged by. the spring 12.
  • the effect is to urge the limb 11 against one of the projections 5 causing the corresponding drive portion 3 to be rotated.
  • the actuator mechanism is biased (by means not shown) to return to its initial position. This results in the return of the U-shaped member 8.
  • the limb 11 hearing on the circumference of the drive wheel portion also returns so that the drive wheel portion has to be biased in its new position.
  • a pair of resilient members or spring plates 20, 21 are provided to bias the position of the number wheels 1.
  • Each of the plates 20, 21 are-provided with spring fingers each of whichare arranged to rest on the circumference of a respective one of said drive wheel portions.
  • the two spring plates are arranged v tangentially to the drive portions of the counter wheels.
  • the actuator mechanism 7 comprises a U-shaped member 8 carrying a rod-like member 9 (FIG. 2) passing through the arms thereof and extending through an arcuate slot in a side wall of a casing. Each arm of the member 8 is journalled near its free end for mounting on the shaft 4.
  • An engagement member 10, which is journalled to be carried by the rod-like member 9, is provided with limbs 11 each positioned to engage a respective one of the drive portions 3 of the number wheels 1.
  • the engagement member 10 biased so that at least one of the limbs 11 bears on 23 lie on the fingers 22 and rest against the outer surface of the'projections 5.
  • the limb 11 returns to contact the surface of the drive wheel portion between the projections 5a and 5b, and as the U-shaped member returns to its rest position the limb .11 returns also so that its point of con-v tact with the drive wheel portion is between the projections 5b and 5c.
  • FIGS. 4 to 8 show positions which a counter wheel may occupy during steps between index positions.
  • the counter wheel 1 is at an indexposition with the counter mechanism 7 at its rest position.
  • the spring finger 22 is lying longitudinally in contact with the drive portion 3 between the projections c and 5d so that the projection 5c abuts the free end of the spring finger 22.
  • the spring finger 23 overlying the spring finger 22 rests on the extremity of the projection So with its line of action passing through the center of the counter wheel.
  • the limb l l engages the periphery of drive wheel portion 3 between the projections 50 and 5b.
  • the actuator mechanism 7 To rotate the counter wheel through one step to its next index position, the actuator mechanism 7 is urged forward in the direction of the arrow A (as shown in FIG. 4). This causes the U-shaped member 8 to rotate'about the shaft 4, arrow B, and as it does so the limb 11 engages -the projection 5a.
  • the projection 5a is displaced in the forward direction of its counter wheel (i.e., anticlockwise in the drawing), by a distance related to the displacement of the actuator mechanism. In this case, the displacement of the actuator mechanism is not great enough to displace the counter wheel into its next index position by means of the limb ll acting alone.
  • the projection 5d is urged into contact with the spring finger 22 until the spring finger 22 leaves the drive portion 3 so that the spring finger 22 acts on the projection 5d causing the counter wheel to be urged further in the anticlockwise direction.
  • the counter wheel .1 continues in the anticlockwise direction until it reaches the index position shown in FIG. 5.
  • the projection 5d acted on by the spring finger 23 abuts the end of the spring finger 22 so that when the actuator mechanism 7 returns to its rest position (shown in FIG. 2) the limb 11 moves clockwise over the projection 5b (FIG. 8) and rests in contact with the periphery of the drive portion 3 between the projections 5c and 5b.
  • the spring 12 allows the engagement member 10 carrying the limb 11 to be urged away from the drive portion periphery as it passes over the projection 5b.
  • the shape of the projection facilitates their engagement by the limb 11 when it is moved in the anticlockwise direction and disengagement when the limb moves in the clockwise direction.
  • the actuator mechanism 7 is forward of its rest position beyond the next index position, causing the projection 50 to be displaced so far forward that the projection 50' is past the free end of the spring finger 22.
  • the projection Se is urged clockwise by contact with the spring finger 22 and the outer surface of projection 5d, acted on by the spring finger 23, abuts the free end of the spring finger 22, which maintains the counter wheel in its newly occupied index position (shown in FIG. 6) as the actuator mechanism returns to its rest position.
  • the line of action of the spring finger 23 on a projection 5 determines whether a force obtains to rotate the counter wheel clockwise or anticlockwise. In an index position the pressure of the spring finger 23 acts normally on the adjacent projection so that the line of action passes through the center of the wheel C. In FIG. 4, it can be seen, that the line of action of the spring fingers 22, 23 on the projection 5d is such as to cause an anticlockwise movement of the counter wheel. Conversely, in FIG. 7, it can be seen, that the line of action of the spring fingers 22, 23 ensures a clockwise rotation of the wheel. The spring finger 22 therefore acts as a ratchet to step the counter wheel.
  • An indexing mechanism comprising an index wheel having a plurality of index positions, a plurality of projections corresponding in number to said index positions, said projections being spaced equally apart around a peripheral region of the wheel, a stepping pawl device mounted for back and forth movement and positioned to engage in turn the said projections to index the wheel in a forwards direction, and a leaf spring means lying tangentially to the wheel and positioned to press resiliently on said peripheral region and to act on said projections as the wheel is indexed and urge the wheel to each index position in the forwards direction as it is bein indexed by the stepping pawl device, and in the event of e wheel being over indexed past an index position, to urge the wheel back to said index position.
  • leaf spring means comprises an inner leaf spring and an outer leaf spring lying on top of the inner leaf spring, each of said inner and outer leaf springs being fixed at one end and having a free end, the inner leaf spring being-located so that its free end engages the rear of a projection in each of said index positions preventing the wheel from being rotated rearwards past any index position.
  • An indexing mechanism comprising a plurality of index wheels each having a plurality of index positions and each having a plurality of projections corresponding in number to the index positions spaced equally apart around a peripheral region of the wheel, a stepping pawl device for each wheel mounted for back and forth movement and positioned to engage in turn the said projections to index the wheel in a forwards direction, and a leaf spring means for each wheel which lies tangentially to the wheel and is positioned press resiliently on said peripheral region and to act on said projections as the wheel is indexed and urge the wheel to each index position in the forwards direction as it is being indexed by the associated stepping pawl device, and, in the event of the wheel being over indexed past the indexed position, to urge the wheel back to said index position.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Discharge By Other Means (AREA)
  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)
US82906A 1969-11-07 1970-10-22 Indexing mechanisms Expired - Lifetime US3670580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5457069 1969-11-07

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US3670580A true US3670580A (en) 1972-06-20

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Application Number Title Priority Date Filing Date
US82906A Expired - Lifetime US3670580A (en) 1969-11-07 1970-10-22 Indexing mechanisms

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US (1) US3670580A (enrdf_load_stackoverflow)
JP (1) JPS519511B1 (enrdf_load_stackoverflow)
DE (1) DE2054706A1 (enrdf_load_stackoverflow)
GB (1) GB1266614A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8903850D0 (en) * 1989-02-21 1989-04-05 Wilson Trevor E A mechanical counter for indicating row by row the number of knitted rows on a domestic knitting machine
US5058400A (en) * 1989-02-21 1991-10-22 Wilson Trevor E Intarsia carriage incorporating row counter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US321062A (en) * 1885-06-30 Mechanical movement
US962133A (en) * 1908-03-12 1910-06-21 Underwood Typewriter Co Ratchet mechanism for ribbons of type-writing machines.
US1818690A (en) * 1929-05-15 1931-08-11 E Ingraham Co Pawl for ratchet-mechanisms
US1979028A (en) * 1932-10-20 1934-10-30 Teleregister Corp Pawl and ratchet mechanism
US2868026A (en) * 1957-08-22 1959-01-13 Mallory & Co Inc P R Intermittent driving mechanism
US3136167A (en) * 1961-04-18 1964-06-09 Partner Ab Mechanisms for transforming a continuous rotary movement into an intermittent rotarymovement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US321062A (en) * 1885-06-30 Mechanical movement
US962133A (en) * 1908-03-12 1910-06-21 Underwood Typewriter Co Ratchet mechanism for ribbons of type-writing machines.
US1818690A (en) * 1929-05-15 1931-08-11 E Ingraham Co Pawl for ratchet-mechanisms
US1979028A (en) * 1932-10-20 1934-10-30 Teleregister Corp Pawl and ratchet mechanism
US2868026A (en) * 1957-08-22 1959-01-13 Mallory & Co Inc P R Intermittent driving mechanism
US3136167A (en) * 1961-04-18 1964-06-09 Partner Ab Mechanisms for transforming a continuous rotary movement into an intermittent rotarymovement

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JPS519511B1 (enrdf_load_stackoverflow) 1976-03-27
DE2054706A1 (de) 1971-05-19
GB1266614A (enrdf_load_stackoverflow) 1972-03-15

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