GB1153929A - Improvements in or relating to A Sewing Machine Speed Control Device - Google Patents
Improvements in or relating to A Sewing Machine Speed Control DeviceInfo
- Publication number
- GB1153929A GB1153929A GB41051/67A GB4105167A GB1153929A GB 1153929 A GB1153929 A GB 1153929A GB 41051/67 A GB41051/67 A GB 41051/67A GB 4105167 A GB4105167 A GB 4105167A GB 1153929 A GB1153929 A GB 1153929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- motor
- capacitor
- control circuit
- rectifier
- 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
Links
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 a thyristor or the like in series with the power supply and the motor
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/14—Devices for changing speed or for reversing direction of rotation
- D05B69/18—Devices for changing speed or for reversing direction of rotation electric, e.g. foot pedals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
Abstract
1,153,929. Measuring speed electrically. MEFINA S.A. Sept. 8, 1967 [Sept. 23, 1966], No. 41051/67. Heading G1N. [Also in Divisions G3 and H2] A sewing machine is driven by a series motor M through a notched belt 9 bearing iron cleats 16 at regular intervals to form part of a tachometer generator 10, whose stator comprises soft iron parts 11, 12, a permanent magnet 13, and a winding 14. The amplitude and frequency of the voltage induced in the winding 14 is proportional to the speed of the machine. The motor M is supplied from A.C. lines a, b, through controlled rectifier D2 and diode D1, the rectifier being triggered when the voltage across capacitor C is sufficient to break down a Zener diode D3. The capacitor is shunted by transistor T having the tachometer generator 10 in its base control circuit. If the machine tends to over-speed, the transistor becomes more conductive to discharge the capacitor at a greater rate, so retarding the firing-point of the rectifier D2. This reduces the motor current and restores the speed to a set value. Similarly, the motor current is increased to allow for a drop in speed. In a modification, the cleats 16 are formed as permanent magnets constituted by synthetic resin containing a magnetic powder, the magnetic circuit located in proximity to the belt being constituted of soft iron. The control circuit for the motor may be adapted to respond to frequency variations of the tachometer voltage, the control circuit comprising a pulse counter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1387466A CH444275A (en) | 1966-09-23 | 1966-09-23 | Device for controlling the speed of a sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1153929A true GB1153929A (en) | 1969-06-04 |
Family
ID=4396087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB41051/67A Expired GB1153929A (en) | 1966-09-23 | 1967-09-08 | Improvements in or relating to A Sewing Machine Speed Control Device |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE703602A (en) |
| CH (1) | CH444275A (en) |
| DE (1) | DE1660942A1 (en) |
| DK (1) | DK116837B (en) |
| ES (1) | ES344928A1 (en) |
| GB (1) | GB1153929A (en) |
| NL (1) | NL6712517A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2251990A (en) * | 1990-11-22 | 1992-07-22 | Brother Ind Ltd | Sewing motor driving device |
-
1966
- 1966-09-23 CH CH1387466A patent/CH444275A/en unknown
-
1967
- 1967-09-07 BE BE703602D patent/BE703602A/xx unknown
- 1967-09-08 DE DE19671660942 patent/DE1660942A1/en active Pending
- 1967-09-08 GB GB41051/67A patent/GB1153929A/en not_active Expired
- 1967-09-11 ES ES344928A patent/ES344928A1/en not_active Expired
- 1967-09-13 NL NL6712517A patent/NL6712517A/xx unknown
- 1967-09-22 DK DK473567AA patent/DK116837B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2251990A (en) * | 1990-11-22 | 1992-07-22 | Brother Ind Ltd | Sewing motor driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| BE703602A (en) | 1968-02-01 |
| CH444275A (en) | 1967-09-30 |
| DK116837B (en) | 1970-02-16 |
| ES344928A1 (en) | 1968-11-01 |
| DE1660942A1 (en) | 1971-08-26 |
| NL6712517A (en) | 1968-03-25 |
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