US3309820A - Feed mechanism for grinding machine - Google Patents
Feed mechanism for grinding machine Download PDFInfo
- Publication number
- US3309820A US3309820A US390524A US39052464A US3309820A US 3309820 A US3309820 A US 3309820A US 390524 A US390524 A US 390524A US 39052464 A US39052464 A US 39052464A US 3309820 A US3309820 A US 3309820A
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- Prior art keywords
- cams
- feed mechanism
- feed
- switches
- actuating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/20—Drives or gearings; Equipment therefor relating to feed movement
Definitions
- Stepping motors are constructed in such a manner that upon being energized, the motor will turn only through a predetermined part of a revolution.
- a stepping motor When a stepping motor is used as a means for feeding a grinding wheel support, it is desirable to provide for rotating the motor by a single step, by a predetermined number of steps, or to rotate the motor by a rapid series of steps to ad- Vance or to retract the wheel support through a predetermined distance.
- to be able to operate a stepping motor in this manner would require a large block of relays, timers and other electrical control elements.
- an object of the present invention to provide a relatively simple control device for operating a stepping motor type feed mechanism to provide bidirectional feed increments in the form of a rapid succession of increments, a pre-selectcd number of increments or a single increment.
- Another object is to provide a stepping switch and means for actuating the same in accordance with various requirements of a feed mechanism.
- Another object is to provide a dual stepping switch for controlling the bi-directional feeding of both discs of a double disc grinder toward and from grinding position.
- Another object is to provide means for actuating said switch continuously or by increments.
- FIG. 1 is a front elevation of the stepping switch.
- FIG. 2 is a plan view of the stepping switch.
- FIG. 3 is an end elevation of the stepping switch.
- FIG. 4 is an electric circuit.
- FIG. 5 is a chart showing the sequence of operation of switches 1, 2, 3 and 4.
- FIG. 6 is an end elevation of a disc grinder.
- the grinding machine to which the invention is applied consists of a bed 50 having a pair of slides 51 movable longitudinally thereon. Only one slide is shown. Each slide has an abrasive disc 52 rotatably mounted theron. A feed screw 53 is rotatably mounted in bed 5% and is in operative engagement with a nut 54 on slide 51.
- the means for rotating eed screw 53 consists of a worm wheel 55 monuted thereon in engagement with a worm 56 on shaft 57.
- Shaft 57 is rotatably supported in bed 59.
- a hand wheel 58 is attached to one end of shaft 57 for manual operation of feed screw 53.
- a stepping motor 9MTR is attached to the other end of shaft 57 for power operation of the feed screw 53.
- the feed mechanism for each disc is actuated by a stepping motor.
- the stepping motor may be controlled to advance or retract the feed by a single increment, by a predetermined number of increments or by a rapid succession of increments.
- the means for controlling said stepping motor 9MTR consists of a set of cam operated switches 1, 2, 3 and 4 for each motor. The rest of the description is directed to one set of switches. It is to be understood that the term switch as used here includes all well known devices which perform the function of a switch including solid state devices.
- switches 1, 2 and 3 are connected in the circuit to a stepping motor 9MTR. Only two of these Patented Mar. 21, 1967 switches are closed at any one time. The fourth switch closes for each increment regardless of which of the first three switches is closed. This combination of switches may be referred to as a stepping switch.
- Cams 5, 6, 7 and 8, for actuating switches 1, 2, 3 and 4 are mounted on shaft 9 in predetermined angular relation, and located in said relation by pin 40 passing through locating holes in said cams.
- the cams are pinned to shaft 9 and pin 40 is removed.
- the cams may be rotated continuously in either direction by an electric motor 10. When operated in this manner, the stepping motor and feed mechanism are actuated in a rapid succession of increments in either direction.
- the cams may also be rotated intermittently by ratchet mechanism 11 actuated by solenoid 30.
- Solenoid 39 may be actuated by push button FBI and counter relay ZCTR, to provid a single increment or a predetermined number of increments.
- Switches 1, 2, 3 and 4 are supported in a frame 12, one end of which is pivotally supported at 13 on base member 20, the other end of which is resiliently supported by fiat springs 14 which permit a certain amount of arcuate movement of frame 20 about pivot 13 in either direction.
- Spring plunger screws 21 and 22 stabilize frame 12 in its central or neutral position as shown.
- traction member 15 On the end of shaft 9 adjacent springs 14 is a traction member 15.
- frame 12 and switches 1, 2, 3 and 4, along with traction member 15, are swung about pivot 13 by means of solenoid 16.
- Solenoid 17 swings the right hand frame to feed the right hand disc.
- Traction member 15 is thus moved into frictional engagement with one of two continuously driving members 18 or 19 driven by motor 10 to rotate shaft 9 and earns 5, 6, 7 and 8 in either direction, depending on whether the feed movement is for advancing or retracting the grinding discs.
- the controls for actuating the stepping motor to retract the grinding wheel are similar to those described above for operating said motor to advance the grinding wheel, except that, obviously, reverse direction of rotation of the camshaft is effected through energization of the appropriate solenoids.
- Relay contact 9CR1 closes in a circuit with normally closed contact 7CR1 and counter contact 2CTR3 to hold relay 9CR after push button FBI is released.
- Relay contact SCRZ closes to complete a circuit through motor control relay 9MCR and to counter relay ZCTR.
- Said stepping switch actuates the feed screw 53 in nut 54 to provide a predetermined feed increment for the abrasive disc 52.
- Counter relay ZCTR may be set for a predetermined number of increments or steps.
- Counter contact ZCTRZ completes a circuit to energize solenoid 3t ⁇ and counter relay 2CTR.
- Solenoid 30 actuates pawl 31 to turn ratchet 11 and cams 5, 6, 7 and 8 one increment.
- counter relay 2CTR is deenergized through complete count-out.
- Counter contact 2CTR2 opens to deenergize solenoid 30 to permit resetting pawl 31 actuated by solenoid 30.
- Counter contact 2CTR3 opens to deenergize relay CR and stepping motor 9MTR, and the counter is reset to zero for the next count.
- the increment feed selector switch A is set to close a circuit to energize motor and relay 7CR.
- Push button FBI is depressed and held to complete a circuit to energize relay 9CR.
- Relay contact 9CR1 closes in a circuit from contact 7CR2 through normally open limit switch 4 to relay 9CR as indicated above, switch 4 closes for each increment.
- Relay contact 9CR2 closes in a circuit to energize relay 9MCR and stepping motor 9MTR.
- Relay contact 9CR3 closes in a circuit from contact 7CR4 to energize solenoid 16 and swing frame 12 and traction member into engagement with driving member 18 to effect continuous rotation of shaft 9.
- the motor turns through a single increment or step.
- Push button FBI is released to stop the feed movement with the disc in the desired position.
- Relay 9CR is deenergized upon release of push button PBl, unless, at that moment, contact MCS4 is held closed by cam 8, in which event, camshaft rotation continues until cam 8 permits contact MCS4 to open and deenergize relay 9CR, and thus prevent stopping rotation of shaft 9 with the pins on ratchet mechanism 11 in improper position relative to pawl 31.
- Relay contact 9CR2 opens to deenergize relay 9MCR and stepping motor 9MTR.
- Relay contact 9CR3 opens to deenergize solenoid 16, permitting spring plunger screw 22 to swing frame 12 about its pivot 13 and disengage traction member 15 from driving member 18 to stop rotation of shaft 9 and the cams mounted thereon.
- a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
- means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches,
- (j) means to actuate said ratchet mechanism and said cams to provide a single increment of feed or a predetermined number of increments.
- ((1) means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams for actuating said switches.
- means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches,
- means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams,
- means for control-ling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams,
- Keams Comprising a plurality of calm, 2 334 531 11 1943 p 51 1 55 (e) means for operating said actuating means con- 2,881,568 4/1959 Hahn et a1 51 165 X tinuously to rotate said motor through a continuous 10 series of steps, LESTER M. SWINGLE, Primary Examiner.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
March 21, 1967 E. R. DUNN FEED MECHANISM FOR GRINDING MACHINE 5 Sheets-Sheet 1 Filed Aug. 19, 1964 INVENTOR ELM/1N 1?. DUNN ayZkM ATTORNEY March 21, 1967 E. R. DUNN 3,309,820
FEED MECHANISM FOR GRINDING MACHINE Filed Aug. 19, 1964 5 Sheets-Sheet 2 1 L 1" i s x imi INVENTOR ELMAN R. DUNN ATTORNEY E. R. DU NN March 21, 1967 FEED MECHANISM FOR GRINDING MACHINE 5 Sheets-Sheet 5 Filed Aug. 19, 1964 l-h'llullllll lliL| INVENTOR ELMAN R- DUNN m ATTORNEY March 21, 1967 E. R. DUNN 3,309,820
FEED MECHANISM FOR GRINDING MACHINE Filed Aug. 19, 1964 5 Sheets-Sheet DEG FEES I 60 Z 00 E40 280 52 0 INVENTOR ELM/1N R.DUNN
i X g QLLJ TTORNEY March 21, 1967 E. R. DUNN 3,309,820
FEED MECHANISM FOR GRINDING MACHINE Filed Aug. 19, 1964 5 Sheets-Sheet 5 LE]; 7 v L? INVENFOK ATTORNEY United States Patent 3,309,820 FEED MECHANISM FOR GRINDING MACHINE Elman R. Dunn, Roscoe, 111., assignor to Landis Tool Company, Waynesboro, Pa. Filed Aug. 19, 1964, Ser. No. 390,524 7 Claims. (Cl. 51165) This invention relates to feed mechanism for grinding machines, particularly disc grinders, and more particularly, feed mechanisms of the type in which the feed movement is provided by an electric stepping motor.
Stepping motors are constructed in such a manner that upon being energized, the motor will turn only through a predetermined part of a revolution. When a stepping motor is used as a means for feeding a grinding wheel support, it is desirable to provide for rotating the motor by a single step, by a predetermined number of steps, or to rotate the motor by a rapid series of steps to ad- Vance or to retract the wheel support through a predetermined distance. Ordinarily, to be able to operate a stepping motor in this manner would require a large block of relays, timers and other electrical control elements.
It is, therefore, an object of the present invention to provide a relatively simple control device for operating a stepping motor type feed mechanism to provide bidirectional feed increments in the form of a rapid succession of increments, a pre-selectcd number of increments or a single increment.
Another object is to provide a stepping switch and means for actuating the same in accordance with various requirements of a feed mechanism.
Another object is to provide a dual stepping switch for controlling the bi-directional feeding of both discs of a double disc grinder toward and from grinding position.
Another object is to provide means for actuating said switch continuously or by increments.
FIG. 1 is a front elevation of the stepping switch.
FIG. 2 is a plan view of the stepping switch.
FIG. 3 is an end elevation of the stepping switch.
FIG. 4 is an electric circuit.
FIG. 5 is a chart showing the sequence of operation of switches 1, 2, 3 and 4.
FIG. 6 is an end elevation of a disc grinder.
The grinding machine to which the invention is applied consists of a bed 50 having a pair of slides 51 movable longitudinally thereon. Only one slide is shown. Each slide has an abrasive disc 52 rotatably mounted theron. A feed screw 53 is rotatably mounted in bed 5% and is in operative engagement with a nut 54 on slide 51.
The means for rotating eed screw 53 consists of a worm wheel 55 monuted thereon in engagement with a worm 56 on shaft 57. Shaft 57 is rotatably supported in bed 59. A hand wheel 58 is attached to one end of shaft 57 for manual operation of feed screw 53. A stepping motor 9MTR is attached to the other end of shaft 57 for power operation of the feed screw 53.
The feed mechanism for each disc is actuated by a stepping motor. The stepping motor may be controlled to advance or retract the feed by a single increment, by a predetermined number of increments or by a rapid succession of increments.
The means for controlling said stepping motor 9MTR consists of a set of cam operated switches 1, 2, 3 and 4 for each motor. The rest of the description is directed to one set of switches. It is to be understood that the term switch as used here includes all well known devices which perform the function of a switch including solid state devices.
Three of the switches 1, 2 and 3 are connected in the circuit to a stepping motor 9MTR. Only two of these Patented Mar. 21, 1967 switches are closed at any one time. The fourth switch closes for each increment regardless of which of the first three switches is closed. This combination of switches may be referred to as a stepping switch.
Cams 5, 6, 7 and 8, for actuating switches 1, 2, 3 and 4, are mounted on shaft 9 in predetermined angular relation, and located in said relation by pin 40 passing through locating holes in said cams. The cams are pinned to shaft 9 and pin 40 is removed. The cams may be rotated continuously in either direction by an electric motor 10. When operated in this manner, the stepping motor and feed mechanism are actuated in a rapid succession of increments in either direction. The cams may also be rotated intermittently by ratchet mechanism 11 actuated by solenoid 30. Solenoid 39 may be actuated by push button FBI and counter relay ZCTR, to provid a single increment or a predetermined number of increments.
On the end of shaft 9 adjacent springs 14 is a traction member 15. When it is desired to provide a rapid succession of increments of feed in either direction, frame 12 and switches 1, 2, 3 and 4, along with traction member 15, are swung about pivot 13 by means of solenoid 16. Solenoid 17 swings the right hand frame to feed the right hand disc.
The controls for actuating the stepping motor to retract the grinding wheel are similar to those described above for operating said motor to advance the grinding wheel, except that, obviously, reverse direction of rotation of the camshaft is effected through energization of the appropriate solenoids.
OPERATION Normal increment feed To initiate normal or ratchet operated increment feed, push button P131 is closed momentarily to energize relay 9CR.
Relay contact 9CR1 closes in a circuit with normally closed contact 7CR1 and counter contact 2CTR3 to hold relay 9CR after push button FBI is released.
Relay contact SCRZ closes to complete a circuit through motor control relay 9MCR and to counter relay ZCTR.
The 9MCR contacts close in the circuit to stepping motor 9MTR. Said stepping switch actuates the feed screw 53 in nut 54 to provide a predetermined feed increment for the abrasive disc 52.
Counter relay ZCTR may be set for a predetermined number of increments or steps.
Counter contact ZCTRS completes the holding circuit to relay 9CR.
Counter contact ZCTRZ completes a circuit to energize solenoid 3t} and counter relay 2CTR.
Energization of solenoid 3i) will be repeated by suitable control elements if the counter is set for more than one increment.
When a single step or a predetermined number of steps is completed, counter relay 2CTR is deenergized through complete count-out.
Counter contact 2CTR2 opens to deenergize solenoid 30 to permit resetting pawl 31 actuated by solenoid 30.
Counter contact 2CTR3 opens to deenergize relay CR and stepping motor 9MTR, and the counter is reset to zero for the next count.
Repealing increment feed If it is desired to provide a continuous increment feed by continuous rotation of shaft 9, the increment feed selector switch A is set to close a circuit to energize motor and relay 7CR.
Push button FBI is depressed and held to complete a circuit to energize relay 9CR.
Relay contact 9CR1 closes in a circuit from contact 7CR2 through normally open limit switch 4 to relay 9CR as indicated above, switch 4 closes for each increment.
Relay contact 9CR2 closes in a circuit to energize relay 9MCR and stepping motor 9MTR.
Relay contact 9CR3 closes in a circuit from contact 7CR4 to energize solenoid 16 and swing frame 12 and traction member into engagement with driving member 18 to effect continuous rotation of shaft 9.
With any two of the contacts MCSl, MCSZ or MCS3 closed, the motor turns through a single increment or step.
Successive steps will occur as the combination of contacts 1, 2 and 3 is changed by rotation of the corresponding cams.
Continuous rotation of cams 5, 6, 7 and 8 by motor 10 causes opening and closing of contacts 1, 2 and 3 in a predetermined sequence to provide successive steps or increments of rotation of motor 9MTR in either direction depending on the direction of rotation of said cams, until an abrasive disc 52 is advanced rapidly to the desired position.
The sequence of contact operation is illustrated in the chart, FIG. 5.
Push button FBI is released to stop the feed movement with the disc in the desired position.
Relay 9CR is deenergized upon release of push button PBl, unless, at that moment, contact MCS4 is held closed by cam 8, in which event, camshaft rotation continues until cam 8 permits contact MCS4 to open and deenergize relay 9CR, and thus prevent stopping rotation of shaft 9 with the pins on ratchet mechanism 11 in improper position relative to pawl 31.
Relay contact 9CR2 opens to deenergize relay 9MCR and stepping motor 9MTR.
Relay contact 9CR3 opens to deenergize solenoid 16, permitting spring plunger screw 22 to swing frame 12 about its pivot 13 and disengage traction member 15 from driving member 18 to stop rotation of shaft 9 and the cams mounted thereon.
1 claim:
1. In a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
(b) means for actuating said feed mechanism comprising (c) a stepping motor,
(d) means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches,
(f) a corresponding plurality of rotatable cams for actuating said switches,
( g) means for rotating said cams continuously in either direction to actuate said feed mechanism in a rapid serie of c eme t (11) means to engage and disengage said cams from said continuous rotating means,
(i) a ratchet mechanism for rotating said cams intermittently,
(j) means to actuate said ratchet mechanism and said cams to provide a single increment of feed or a predetermined number of increments.
2. In a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
(b) means for actuating said feed mechanism comprising (c) a stepping motor,
((1) means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams for actuating said switches.
31 In a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
(b) means for actuating said feed mechanism comprising (c) a stepping motor,
(d) means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches,
(f) and means for actuating said switches in a predetermined sequence comprising a corresponding plurality of rotatable cams.
4. In a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
(b) means for actuating said feed mechanism comprising (c) a stepping motor,
(d) means for controlling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams,
(f) and means for rotating said cams continuously to actuate said feed mechanism in a rapid series of increments.
5. In a grinding machine having (a) a feed mechanism for advancing and retracting a grinding wheel,
(b) means for actuating said feed mechanism comprising (c) a stepping motor,
(d) means for control-ling said stepping motor comprising (e) a stepping switch mechanism having a plurality of switches and a corresponding plurality of rotatable cams,
(f) means for rotating said cams continuously to actuate said feed mechanism in a rapid series of increments,
(g) and means to engage and disengage said cams from said continuous rotating means.
. In a machine tool having movable elements,
(a) means for actuating one or more of said elements comprising (b) a stepping motor,
(c) a plurality of switches for actuating said motor,
(d) means for actuating said switches in a predetermined sequence to rotate said motor intermittently,
(e) means for operating said actuating means continuously to rotate said motor through a continuous series of steps,
(f) and means to operate said actuating means to rotate said motor through a predetermined number of steps or a single step.
6 7. In a machine tool having movable elements, (f) and counting means to operate said actuating means (a) means for actuating one or more of said elements to rotate said motor through a predetermined number comprising of steps or a single step. (b) a stepping motor, (c) a plurality of switches for actuating said motor, 5 References Clted by the Exammer (d) means for actuating said switches in a predeter- UNITED STATES PATENTS mined sequence to rotate said motor intermittently 1,978,110 10/1934. Keams Comprising a plurality of calm, 2 334 531 11 1943 p 51 1 55 (e) means for operating said actuating means con- 2,881,568 4/1959 Hahn et a1 51 165 X tinuously to rotate said motor through a continuous 10 series of steps, LESTER M. SWINGLE, Primary Examiner.
Claims (1)
1. IN A GRINDING MACHINE HAVING (A) A FEED MECHANISM FOR ADVANCING AND RETRACTING A GRINDING WHEEL, (B) MEANS FOR ACTUATING SAID FEED MECHANISM COMPRISING (C) A STEPPING MOTOR, (D) MEANS FOR CONTROLLING SAID STEPPING MOTOR COMPRISING (E) A STEPPING SWITCH MECHANISM HAVING A PLURALITY OF SWITCHES, (F) A CORRESPONDING PLURALITY OF ROTATABLE CAMS FOR ACTUATING SAID SWITCHES, (G) MEANS FOR ROTATING SAID CAMS CONTINUOUSLY IN EITHER DIRECTION TO ACTUATE SAID FEED MECHANISM IN A RAPID SERIES OF INCREMENTS, (H) MEANS TO ENGAGE AND DISENGAGE SAID CAMS FROM SAID CONTINUOUS ROTATING MEANS, (I) A RATCHET MECHANISM FOR ROTATING SAID CAMS INTERMITTENTLY, (J) MEANS TO ACTUATE SAID RATCHET MECHANISM AND SAID CAMS TO PROVIDE A SINGLE INCREMENT OF FEED OR A PREDETERMINED NUMBER OF INCREMENTS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US390524A US3309820A (en) | 1964-08-19 | 1964-08-19 | Feed mechanism for grinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US390524A US3309820A (en) | 1964-08-19 | 1964-08-19 | Feed mechanism for grinding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3309820A true US3309820A (en) | 1967-03-21 |
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ID=23542811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US390524A Expired - Lifetime US3309820A (en) | 1964-08-19 | 1964-08-19 | Feed mechanism for grinding machine |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3309820A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3513600A (en) * | 1967-06-14 | 1970-05-26 | Litton Industries Inc | Stepping motor control provisions for machine tool feed mechanism |
| US3701220A (en) * | 1970-08-03 | 1972-10-31 | Norton Co | Electric feed for machine element |
| JPS4841264Y1 (en) * | 1972-05-20 | 1973-12-03 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1978110A (en) * | 1930-02-13 | 1934-10-23 | Cincinnati Grinders Inc | Grinding machinery |
| US2334581A (en) * | 1942-01-29 | 1943-11-16 | Norman Company Van | Cross-feed for grinding machines |
| US2881568A (en) * | 1955-03-24 | 1959-04-14 | Heald Machine Co | Grinding machine |
-
1964
- 1964-08-19 US US390524A patent/US3309820A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1978110A (en) * | 1930-02-13 | 1934-10-23 | Cincinnati Grinders Inc | Grinding machinery |
| US2334581A (en) * | 1942-01-29 | 1943-11-16 | Norman Company Van | Cross-feed for grinding machines |
| US2881568A (en) * | 1955-03-24 | 1959-04-14 | Heald Machine Co | Grinding machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3513600A (en) * | 1967-06-14 | 1970-05-26 | Litton Industries Inc | Stepping motor control provisions for machine tool feed mechanism |
| US3701220A (en) * | 1970-08-03 | 1972-10-31 | Norton Co | Electric feed for machine element |
| JPS4841264Y1 (en) * | 1972-05-20 | 1973-12-03 |
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