US3838253A - Electromagnetic counter - Google Patents

Electromagnetic counter Download PDF

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Publication number
US3838253A
US3838253A US00262481A US26248172A US3838253A US 3838253 A US3838253 A US 3838253A US 00262481 A US00262481 A US 00262481A US 26248172 A US26248172 A US 26248172A US 3838253 A US3838253 A US 3838253A
Authority
US
United States
Prior art keywords
coil
reed switch
counter
permanent magnet
magnetic
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
US00262481A
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English (en)
Inventor
N Sanada
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.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works Ltd
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 Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Application granted granted Critical
Publication of US3838253A publication Critical patent/US3838253A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/08—Design features of general application for actuating the drive
    • G06M1/10—Design features of general application for actuating the drive by electric or magnetic means
    • G06M1/102—Design features of general application for actuating the drive by electric or magnetic means by magnetic or electromagnetic 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
    • G06M1/28—Design features of general application for zeroising or setting to a particular value
    • G06M1/30—Design features of general application for zeroising or setting to a particular value using heart-shaped or similar cams; using levers
    • G06M1/32—Actuating means, e.g. magnet, spring, weight
    • G06M1/323—Actuating means, e.g. magnet, spring, weight with drums

Definitions

  • electromagnetic counters are used in many applications such as an automatic control panel and a counter for counting the number of products. Where such electromagnetic counters are used for operating various control devices and gate circuits, it is necessary to provide an electric contact for holding itself closed and any related circuit in the operating condition from the commencement to the termination of the counting operation.
  • the prior art electromagnetic counter with such a holding contact has a construction as shown in FIG. 1, for example. More particularly, the electromagnetic counter comprises an electrical coil A mounted on a base C, an armature B operated by electrical coil A and a contact operating member D operated by the free end of the armature.
  • the contact operating member D is adapted to engage with one of a pair of resilient contact members E and E which are anchored to the base at their bases.
  • the contact operating member D is provided with a lug F adapted to operate the reset member H of a digit wheel G. When operated, the reset member H resets the digit wheel G to zero.
  • armature B is disengaged from contact operating member D whereby the member D is snapped by the resiliency of contact member E thus closing contacts E and E Accordingly, these contacts are held in their closed state irrespective of the second and following signals and are opened only when a zero reset button I is depressed for restoring the contact operating member D to the original position shown in FIG. 1 by depressing zero reset member H.
  • the electromagnetic counter of the construction described above is not advantageous in that not only its construction is complicated but also the response of the digit wheel G for the first and second and succeeding signals to be counted becomes different redue to the resistance imposed upon the armature B by the contact operating member D. Accordingly, the counter can not operate stably. For this reason the prior art electromagnetic counter has been designed to require excessively large pulses and to produce ample flux density by the coil in order to prevent misoperation. However, under a certain condition it is impossible to provide sufficiently large signals. Further it is necessary to increase the dimension of the coil for producing magnetic flux of large density.
  • an electromagnetic counter of the type including an electric coil responsive to a signal to be counted, a pair of digit wheels operated by the coil, a holding contact which is closed when the coil is energized and adapted to hold itself closed and any related circuit in the operating condition, and means for resetting the digit wheels and opening the holding contact, characterized in that the holding contact comprises a magnetic switch disposed to be operated by the coil and the reset means comprises a permanent magnet which is normally positioned with respect to the magnetic switch such that the magentic flux generated by the permanent magnet is not sufficient to close the magnetic switch but sufficient to hold it in the closed state once it has been closed by the coil.
  • FIG. 11 is a diagrammatic representation of a prior art electromagnetic counter with holding contacts and FIG. 2 is a similar view of an electromagnetic counter embodying the invention.
  • FIG. 2 there is shown a twin type electromagnetic counter embodying the invention.
  • the electromagnetic counter shown therein comprises a pair of digit wheels 2 and 3 with their shafts 4 and 5 journalled in the front portion of a base ll. Digit wheels 2 and 3 are coupled together by means of an intermediate gear 6.
  • On the lower rear side of base 1 is mounted an electric coil 8 associated with a magnetic yoke 7 and a magnetic core 9.
  • An armature 10 is attracted by magnetic core 9 and the lower end of the armature 10 is pivotally supported by the yoke 7.
  • the armature 10 carries a lever 11 and a pawl 13 is mounted on the outer end of lever 11 for operating-a ratchet wheel 12 provided for one digit wheel 2.
  • the coil 8 When the coil 8 is energized by a signal to be counted, the armature 10 is attracted by core 9 to advance one step the digit wheels 2 and 3 by pawl 13.
  • the application of the signals causes digit wheel 2 to advance one step in the addition direction and digit wheel 3 to rotate one step in the subtraction direction.
  • a magnetic responsive element shown as a reed switch 14 is disposed in parallel with core 9 at a position influenced by the magnetic flux generated by coil 8. As above described, the output of reed switch 14 is used to operate the gate circuits of various control devices.
  • the inner end 15a of a zero reset member 15 for resetting to zero digit wheels 2 and 3 is disposed to extend substantially in parallel with reed switch 14 and a permanent magnet 16 is secured to the inner end 15a.
  • the position of the permanent magnet 16 and the intensity of the magnetic flux produced thereby are selected such that the magnetic flux is not sufficient to operate the reed switch but sufficient to hold it in the operated state.
  • the zero reset member 15 is provided with an integral reset lug 17 for engaging a heart shaped cam (not shown) associated with digit wheel 3 thereby resetting digit wheels 2 and 3 to zero.
  • the reed switch 14 is positioned to be influenced by the magnetic flux generated by permanent magnet 16 but the reed switch 14 will not be operated by this flux alone because the effect of the magnetic flux is small.
  • the reed switch 14 will be closed due to leakage flux from coil 8. Once closed, the reed switch 14 is held in its operated state by the flux generated by permanent magnet 16 irrespective of the subsequent deenergization of coil 8.
  • the zero reset member 15 is operated later, the permanent magnet 16 is moved away from reed switch 14 thus opening the same.
  • the invention provides an electromagnetic counter of small and compact construction.
  • An electromagnetic counter comprising an electric coil adapted to be energized by a signal to be counted, an armature actuated by said coil, digit wheel means operated by said armature to count successive energizations of said coil, a holding contact in the form of a magnetic reed switch disposed to be operated by the leakage flux of said coil, reset means movable to reset said counter, a permanent magnet mounted to move with said reset means and normally positioned with respect to said magnetic reed switch such that the magnetic flux generated by said permanent magnet is not sufficient to close said magnetic reed switch but sufficient to hold said magnetic reed switch in the closed state once it has been closed by said coil, said flux of said permanent magnet being insufficient to hold said magnetic reed switch in a closed state when said permanent magnet is displaced from said normal position by movement of said reset means, the contact of said reed switch being adapted to serve as holding contacts during operation of said counter which are opened only by movement of said reset means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US00262481A 1971-06-29 1972-06-14 Electromagnetic counter Expired - Lifetime US3838253A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971055860U JPS5111321Y2 (pt) 1971-06-29 1971-06-29

Publications (1)

Publication Number Publication Date
US3838253A true US3838253A (en) 1974-09-24

Family

ID=27940435

Family Applications (1)

Application Number Title Priority Date Filing Date
US00262481A Expired - Lifetime US3838253A (en) 1971-06-29 1972-06-14 Electromagnetic counter

Country Status (3)

Country Link
US (1) US3838253A (pt)
JP (1) JPS5111321Y2 (pt)
BR (1) BR7204208D0 (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826445A (en) * 1971-12-23 1974-07-30 Sonoco Products Co Yarn tube
JPS5231131A (en) * 1975-09-04 1977-03-09 Toyo Boseki Paper tube for winding spun yarn
JPS54127080U (pt) * 1978-02-27 1979-09-04

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158761A (en) * 1963-03-06 1964-11-24 Gen Electric Logic circuit utilizing a latch type switching device as a permanent memory element
US3204869A (en) * 1963-07-11 1965-09-07 Kienzle Apparate Gmbh Register wheel positioning apparatus
US3227838A (en) * 1961-08-14 1966-01-04 Raymond W Hoeppel Magnetic reed type ultrasensitive circuit breaker
US3292121A (en) * 1963-11-22 1966-12-13 Telefonbau & Normalzeit Gmbh Bistable switching device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227838A (en) * 1961-08-14 1966-01-04 Raymond W Hoeppel Magnetic reed type ultrasensitive circuit breaker
US3158761A (en) * 1963-03-06 1964-11-24 Gen Electric Logic circuit utilizing a latch type switching device as a permanent memory element
US3204869A (en) * 1963-07-11 1965-09-07 Kienzle Apparate Gmbh Register wheel positioning apparatus
US3292121A (en) * 1963-11-22 1966-12-13 Telefonbau & Normalzeit Gmbh Bistable switching device

Also Published As

Publication number Publication date
BR7204208D0 (pt) 1973-07-10
JPS4814143U (pt) 1973-02-16
JPS5111321Y2 (pt) 1976-03-26

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