US3693063A - Speed control device for sewing machines - Google Patents

Speed control device for sewing machines Download PDF

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Publication number
US3693063A
US3693063A US131606A US3693063DA US3693063A US 3693063 A US3693063 A US 3693063A US 131606 A US131606 A US 131606A US 3693063D A US3693063D A US 3693063DA US 3693063 A US3693063 A US 3693063A
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US
United States
Prior art keywords
motor
short
speed control
diode
circuiting
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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US131606A
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English (en)
Inventor
Pietro Sillano
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.)
Necchi SpA
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Necchi SpA
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Publication date
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
    • H02P7/295—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC of the kind having one thyristor or the like in series with the power supply and the motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/10—Commutator motors, e.g. repulsion motors

Definitions

  • ABSTRACT A speed control means for a motor of the commutator [30] Foreign Application Priority Data type and 1s parttcuIarly Intended for such motors as A 23 1970 Ital 42906 A/70 applied to sewing machines.
  • the speed control means y is arranged to rotate the brush axis while simultaneously cutting in or cutting out a diode from the motor [52] U.S. Cl ..3l8/337, 318/361 circuit, [51] Int. Cl.
  • the present invention relates to a speed regulator device for commutator electric motors applied to household sewing machines.
  • Speed control of sewing machines of the type mentioned when made frequently and for long time periods by means of the starting rheostat incurs several drawbacks such as that of the rheostatic resistance heating up and the consumption of the electric energy which is turned into heat, a harmful rise in temperature occuring in the rheostat if operated for a long time with a portion of its resistance in the circuit, and difficulty in realizing a uniform speed control.
  • it is often necessary to operate at a reduced speed value relative to the nominal one and to effect variations, even if small, of the speed relative to said nominal value and at a pre-arranged reduced value.
  • An object of the present invention is to provide a speed control device for a sewing machine suitable to effect the aforementioned operating conditions through an easy to perform maneuver of the operator, independently of the rheostat.
  • the technical problem to be solved was that of providing a single control member, in a handy position, suitable to control the speed of the machine continuously and to reversibly modify the normal circuit arrangement in order to obtain a reduced motor speed in addition to the nominal one.
  • a disc knob is provided in the base of the sewing machine, connected .by means of a usual drive system to the motor brush holder in a manner so as to be able to rotate the brushes around the motor shaft axis. Said knob, at the same time, in correspondence to a predetermined angular position thereof, actuating the plunger of a microswitch provided to connect and disconnect a rectifier diode in series in the electric driving circuit of the motor.
  • FIG. 1 is a schematic view of the device of the invention.
  • FIG. 2 is a graph showing the relationship between motor speed and angular displacement of the adjusting disc knob.
  • FIG. 1 a household sewing machine is shown schematically and is indicated at provided with a handwheel 11, a plate 12 and a base housing 13.
  • Electric motor 14 of the commutator type is positioned usually in the base housing 13 and is fed in series through commutator 15 and brushes 16.
  • Brushes 1 6 are mounted on a brush holder not shown in the figure, which is connected, through usual drive members also not shown, to a disc knob 17 freely rotatably mounted on housing 13, as shown in US. Pat. application Ser. No. 885,829.
  • a cam 21 fixed coaxially with and to disc knob 17 is rotatable together with it.
  • the camming surface acts against the upper end of a rod-shaped plunger 22 whose opposite end rests on a coil spring 23, fastened at one end to an electrically conductive mounting 24, supported within housing 13, and at its other end to a blade 25 seated in the same mounting 24 in such a way as to be able to oscillate to either side of a contact line of mounting 24 in a manner well-known in the art of microswitches.
  • Said blade 25 forms the movable contact of a switch having two fixed contacts 26 and 27.
  • Fixed contact 27 is a rest contact, while the fixed contact 26 is insertable into the motor feed circuit which comprises an alternating electric current source 28, a starting rheostat 29, an inductor winding 30 for motor 14 and finally a rectifier diode 31.
  • Plunger 22 actuated by cam 21 against the urging of coil spring 23 which is arranged so as to be always under tenxion, can move vertically between two extreme positions in correspondence to the extreme angular positions of disc knob 17.
  • Said blade 25 can therefore be in either of two positions: leaning against fixed contact 27 or against fixed contact 26.
  • the speed drop is represented by vertical segment b.
  • Rotating disc knob 17 further to bring finger 32 against stop 19 provides a further continuous reduction of the motor speed, as represented by segment 0.
  • a speed control means for a sewing machine comprising a drive motor of the commutator type having a rotatable brush holder, an electric circuit for driving said motor comprising in series a starting rheostat, an
  • induction coil and a rectifier diode, and a device forshort-circuiting said diode, an operator actuable means for rotating said brush holder and for actuating said short-circuiting device in correspondence to such rotation whereby said diode is either included in said circuit or short-circuited out of it in dependence upon the angular position of said holder relative to the commutator

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Dc Machiner (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Electric Motors In General (AREA)
US131606A 1970-04-23 1971-04-06 Speed control device for sewing machines Expired - Lifetime US3693063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT4290670 1970-04-23

Publications (1)

Publication Number Publication Date
US3693063A true US3693063A (en) 1972-09-19

Family

ID=11254565

Family Applications (1)

Application Number Title Priority Date Filing Date
US131606A Expired - Lifetime US3693063A (en) 1970-04-23 1971-04-06 Speed control device for sewing machines

Country Status (8)

Country Link
US (1) US3693063A (fr)
AT (1) AT304713B (fr)
BE (1) BE764740A (fr)
CH (1) CH516681A (fr)
DE (1) DE2117071A1 (fr)
ES (1) ES196142Y (fr)
FR (1) FR2083221A5 (fr)
GB (1) GB1289261A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835774A (en) * 1971-11-22 1974-09-17 Heidelberger Druckmasch Ag Device in offset printing presses for controlling the supply of dampening liquid to dampening equipment of the presses
US20030052627A1 (en) * 2000-03-29 2003-03-20 Raimondi Giovanni Mario Motor control for two motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835774A (en) * 1971-11-22 1974-09-17 Heidelberger Druckmasch Ag Device in offset printing presses for controlling the supply of dampening liquid to dampening equipment of the presses
US20030052627A1 (en) * 2000-03-29 2003-03-20 Raimondi Giovanni Mario Motor control for two motors
US6812657B2 (en) * 2000-03-29 2004-11-02 Dyson Limited Motor control for two motors

Also Published As

Publication number Publication date
BE764740A (fr) 1971-09-16
ES196142Y (es) 1975-07-01
CH516681A (it) 1971-12-15
FR2083221A5 (fr) 1971-12-10
GB1289261A (fr) 1972-09-13
DE2117071A1 (de) 1971-11-11
AT304713B (de) 1973-01-25
ES196142U (es) 1975-02-16

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