US2090151A - Commutator notching machine - Google Patents

Description

Aug. 17, 1937. E, POOLE 2,090,151

COMMUTATOR NOTGHING MACHINE Filed Feb. 25, 1935 ATTORNEYS 3 Sheets-Sheet l Aug. 17, 1937. 1.. E. POOLE 2,090,151

COMMUTATOR NOTCHING MACHINE Filed Feb. 23, 1935 3 Sheets-Sheet 2 ATTORNEYS Patented Aug. ll? 1937 ors n of Delaware .dr'zzlcaticn February 23, 1935, Serial No. 7,755

13 Qlairns.

This invention relates to sawing devices and more particularly to a device for sawing notches into the segments of a commutator for receiving the leads of armature coils.

It is among the objects of the present invention automatically to index a commutator so as to present consecutive commutator segments to a rotary saw.

It is another object of the present invention 16 automatically to oscillate the rotary saw in alternation with the indexing of the commutator so as to cut notches into consecutive commutator bars.

It is another object of present invention automatically to stop further indexing of the commutator and oscillation of the saw after all segments of a commutator have been notched.

Further objects and advantages of the present invention will be apparent from the following 29 description, reference being had to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

In the drawings:

Fig. l is a perspective view of a device embodying the present invention.

Fig. 2 is a front elevation of the device, certain parts being shown in section, the section being taken on the line of Fig. 5.

Fig. 3 is a section taken on the line 5-3 of Fig. 2.

Fig. 4 is an end elevation of the device, certain parts being shown in section, the section being taken substantially on the line 2-5 of Fig. 3.

Fig. 5 is a fragmentary section taken on the line 5-5 of Fig. 2.

Fig. 6 is a section taken on the line 5- 6 of Fig. 2.

Fig. '7 is a section taken on the line 'l-l of Fig. 2.

Fig. 8 is a fragmentary section taken on the line 8-43 of Fig. 2.

Fig. 9 is an enlarged section taken on the line 99 of Fig. 2.

The present device is adapted to saw a notch into each segment ill of a commutator ii, the notches being adapted to receive the leads of armature coils after assembly of the commutator with an armature. Generally this device com 50 prises a chuck A for gripping a commutator 52,

an intermittently oscillating, rotating saw B for cutting notches into the commutator segments It, a commutator indexing mechanism 0 for presenting consecutive commutator segments ill 55 to the intermittently oscillating saw B, and an Poole, Anderson, Ind, assignor to General (lorporation, Detroit, Mich a corporaautomatic stop D for the device when all segments of the commutator have been notched by the saw.

Chuck A With particular reference to Figs. 1 and 7, a main frame so, is mounted in any suitable manner on a work bench or other support 22, is provided with aligned bushings 25 in which a cylindrical. member 26 is journaled. Mounted on a reduced portion 28 of member 26 is a disc 3-18 which is further secured to member 26 by one or more screws 32. Member 26 is held longitudinally immovable in frame 2P3 by means of a shoulder 3d of said member and disc 30, as can be readily understood. Member 26 is provided with an annular recess 36, receiving the shank 38 of a member ill, secured in said annular recess 38 by means of a set screw 42. Member id is centrally recessed as at M and has secured therein by means of a set screw 46 a sleeve 38. the upper portion of which is longitudinally split several times so as to provide two or more commutator gripping jaws 50. These jaws are provided with tapered surfaces 52, adapted to cooperate with the tapered end 5 3 of a bar 50 which passes through sleeve 48 and member til and is threadedly received at its lower end by a collar 58 which is slidable in recess 36. Interposed between the shank 38 of member l and a washer (ill is a compression spring which normally urges bar 56 in the direction of arrow M in Fig. 1, whereby the tapered end lid of said bar spreads the jaws to into clamping engagement with the interior, annular wall 66 of a commutator 82. A rod 68 passes through the cylindrical member 26 and is axially aligned with bar 56. This rod 58 carries at its lower end a plunger 7Q, cooperating with one end of a foot pedal "it which is fulcrumed at M. The gravity of rod 63, plunger it and foot pedal '52 urges the same into the position disclosed in Fig. 7 as can be readily understood. If the operator desires to remove a commutator from the chuck A, he merely steps on foot pedal l2, thereby raising rod 68 and bar against the tendency of spring 62 whereby the tapered end 54 of bar 64 is moved out of engagement with the jaws 5i! whereupon the latter contract into their natural, unstrained position relative to each other and release the commutator 12 which is then free to be raised from the jaws. be deposited on the chuck A by bringing the commutator into engagement with a hardened Another commutator may then steel locator 16 which is mounted on sleeve 48. This locator 16 is furthermore provided with a plurality of fingers 18 which are adapted to support the commutator on the segments thereof without, however, interfering with the oscillating saw B while notching segments. I8. Also prior to the gripping of a commutator by the jaws 58, i. e. before the operator releases the foot pedal 12, he aligns one of the segments I8 of a' commutator with an index finger 80 which extends from a bracket 82, suitably attached to the main frame 20. By thus aligning a segment with the index finger 80, the saw B cuts a notch I8d into another segment I0 of the commutator in the center between two side walls 84 of said segment.

intermittently oscillating, rotating saw B.

With particular reference to Figs. 1 to 4 inclusive, a standard 86 is mounted in any suitable manner on main frame and supports one end of a sleeve 82 which is journaled on a stub shaft 94, one end of which is supported by the main frame 28 as at 86. Mounted on the sleeve 82 is an oscillating frame 98, provided With spaced anti-friction bearings I00 in which a shaft I82 is journaled. This shaft carries at one end a saw I04 and is provided at the other end with an extension I06 which is journaled in an antifriction bearing 568, provided by the head IIO of a generally tubular frame I I2. This head H0 is journaled on the oscillating frame 98 as at H4 and retained thereon by means of nuts II6, threadedly received by the shaft extension I06 and retaining the anti-friction bearing I 08 in engagement with a shoulder N8 of said head IIU. Frame II 2 is furthermore guided for limited rotation about the axis of shaft I02 in a plane at right angles thereto by means of a cage II9 which issecured in any suitable manner to the standard 98 and slidably engaged at two 0pposite sides by two flat walls I2I of said frame I I 2. Mounted on shaft I02 intermediate the two bearings H8 is a pulley I20 which is driven by a belt I22, partly covered by a guard I22ct and passing below the support 22 as indicated in Fig. 1 and being driven by any suitable power means such as an electric motor (not shown). Although frame 98 is slightly, oscillated as Will v be described presently nevertheless the belt I22 is in constant driving engagement with the pulley I28 since the belt is sufficiently elastic to adapt itself to slight variations in the distance between the driving and driven pulley as caused by the slight oscillation of the frame 98. Pulley I20 is continuously driven, wherefore the saw I84 is continuously rotated.

Referring to Fig. 2, there is Shown a shaft I26 which is journaled in anti-friction bearings I28 of the main frame 28 and in a sleeve I88, provided by standard 98. Mounted on shaft I26 is a cam I82, cooperating with an anti-friction roller I34 (see Fig. 3), carried by a bar I86 which is axially adjustably carried by a boss I38 of an arm I 48, integral with oscillating frame 98. Pivoted at I42 to the arm I46 is a rod I44 which passes through a stationary lug I46 and is normally urged to the right as viewed in Fig. 3 by means of a compression spring I48, thereby normally'tending to rotate the oscillating frame 98 counterclockwise as viewed in Fig. 3.

commutator indexing mechanism 0 With particular reference to Figs. 2, 4, 5 and 7 to 9 inclusive, the disc 30 carries as many equi- .angularly spaced pins I58 as there are segments to a commutator I2. Mounted on shaft I26 is a drum I 52, having a peripheral cam groove I54 Which comprises a spiral groove portion I56, merging into an angular groove portion I58 which terminates into .another spiral groove portion I60, parallel to groove portion I56. In one angular position of the drum I52, the end faces I62 thereof fit between twopins I50a and I580, while the pin I582) therebetween projects into the annular groove portion I58. Upon rotation of the drum I52 in the direction of arrow I64 in Fig. 9 pin I58a is guided into the spiral groove portion I56 due to the camming action of the spiral groove portion I 60 upon pin I522) as can be readily understood. By the time pin 150a. reaches the annular groove portion I58, pin I521) has just left the spiral groove portion I 60, and when pin I500 leaves the annular groove portion I58 under the carnming action of spiral groove portion I60, another pin I 58 will have been moved into the spiral groove portion I56. While a pin I50 projects into the annular groove portion I58 of the rotating drum I52, no rotation of disc 36 or of the chuck A takes place as can be readily understood. notation of the disc 38 and thereby of chuck A takes place only while a pin I56 cooperates with the spiral groove portion I60. Therefore, the drum I52 may be continuously rotated because only during a certain cycle of one revolution 9 thereof the cam disc 36 is rotated an angular distance equal to that between two consecutive pins I50, whereas during the remaining cycle of one revolution of the drum I52 the saw carrying frame 98 is oscillated so as to cut a notch I0a into one of the segments I0 of the commutator I2.

Shaft I26 is continuously driven by the rotating shaft I02 in a manner to be described presently. Rotatably mounted in the substantially tubular frame H2 (see Figs. 2, 4 and 5) is a shaft I10, one end of which carries a bevel gear I12 which is in constant mesh with .another bevel gear I14, mounted on the shaft extension I06. The other end of shaft I10 is provided with a worm I16 (see Fig. 5) which meshes with a worm gear I18, drivingly connected with shaft I26 in a manner to be described later. Projecting from the standard is a stub-shaft I88 on which is journaled a roller I82, adapted to engage a steel wear-plate I84, secured in any suitable manner to the tubular frame I I2. er I86 normally urges the lower end of the tubular frame H2 and more particularly the wear piece I84 thereof into engagement with the roller I82. The roller I82 is so located that upon engagement with the wear plate I84, worm I16 is in proper mesh with worm gear I18. It is evident that during oscillation of the saw carrying frame 68 the tubular frame II2 has slight axial component reciprocations, resulting in reciprocations of the wear plate I84 relative to roller I82 which are, however, so short that the resulting slight bodily movements of worm I16 toward and away from worm gear I18do not adversely influence the proper cooperation between worm I16 and worm gear I18. In this manner, shaft I26 which carries the indexing.

cam I52 is continuously rotated by the saw carrying shaft I82 through intermediation of bevel gears I14, I12, shaft I10, worm I16 and worm 2 gear I 18. Oscillation of the saw carrying frame 98 result, as already explained, in slight axial component reciprocations of the tubular frame H2. Such reciprocations of frame II2 result in slight longitudinal movements of the worm I16 A spring urged plungwhich are naturally transmitted to the worm gear I18 and alternately slow down and speed up rotation of said worm gear. Due to the very slight oscillation of the saw carrying frame, the continuous change in the rotary speed of the worm gear I'iil is so slight that it cannot be noticed and consequently has no adverse influence upon the proper operation of the device.

Automatic stop D With particular reference to Figs. 2 and 8, the worm gear I'iB is loosely mounted on shaft I26 and provided with clutch teeth I99, adapted to cooperate with corresponding clutch teeth I92 of a clutch member Hi l which is splined at I96 to a reduced portion I93 of shaft 226. A portion of shaft I26 is internally recessed at W9 and receives therein a compression spring 2% and a bar 282 which is provided with a transverse pin 2%, projecting through two diagonally opposite oblong slots 296 of the reduced shaft portion I98 and secured to the clutch member E94. The compression spring 280 normally urges bar 282 toward the left as viewed in Fig. 2, thereby normally urging clutch member i934 out of engagement with the clutch teeth E98 of worm gear I118. In order to engage clutch member I94 with the clutch teeth I963 of worm gear 18, a manually operable lever 29B, pivotally mounted at 2m to cage He, is manually rocked whereby the same engages bar and shifts the same to the right as viewed in Fig. 2, thereby moving the clutch member I95 into engagement with the clutch teeth l9il of worm gear fit as can be understood from the foregoing description.

As best shown in Figs. 2 and '7, the disc 30 is provided with an annular rim 2I2 to which is secured a cam disc 25 having a single depression 256 in its otherwise cylindrical periphery. Cooperating with this cam disc is anti friction roller iii, carried by a longitudinally slidable rod 220, fioatingly pivoted at 222 to the clutch actuating lever 2%. It follows from Fig. 2 that the compression spring 2% normally urges the lever 2% in a counterclockwise direction and the rod 220 to the right, thereby normally retaining the anti-friction roller H8 in engagement with the cam disc 214.

It has been earlier explained that the saw carrying shaft 662 is continuously rotated, and that shaft K25 is driven from the saw carrying shaft H22 through intermediation of bevel gears I'M, H2, shaft lid, worm l'ifi, worm gear H8 and clutch member 5%. While the device is in idle condition, the roller 2 I8 projects into the depression 2 i t of the cam disc 2 M and the clutch member Hi l is then out of engagement with the teeth IQ? of worm gear H8. In the idle position of the device, cam E32 assumes the position shown in 3 in which the saw carrying frame is held in a position in which the saw is most withdrawn from the chuck A as indicated in dot-and-dash lines in Fig. 7, and the indexing cam Hit assumes the position shown in Fig. 9 in which upon renewed rotation of shaft the chuck A is immediately indexed before the saw carrying frame 98 makes its first oscillation. Hence, upon renewed operation of the device the depression 2H5 of cam disc 2 it immediately disaligns from roller 2 I8, permitting the operator to release the clutch actuating lever 2% immediately after manipulation of the same for a re-start of the device. To start the device after a commutator has been removed from the chuck and a new commutator has been deposited thereon, the operator rocks the lever 2G8 clockwise as viewed in Fig. 2, thereby causing clutch engagement. Since there are as many indexing pins Hid as there are segments If! to a commutator l2, it is obvious that after one complete revolution of the disc 38 all segments of a commutator have been notched by the saw IM. Just after the last segment of a commutator has been notched, the indexing cam continues its rotation until an indexing pin, pres-- ently projecting into the annular groove portion I58, assumes the position lfillb relative to the rotating cam 52, at which time the depression 2N5 of said cam re-aligns with the anti-friction roller 2H8, permitting the same to drop therein under the action of the compression spring 2533 so that the lever 2% is rocked into clutch releasing position.

In order to prevent overtravel of the cam shaft I26 after automatic disengagement of clutch member I84 from the clutch teeth of worm gear I18 so as to maintain an initial angular position of the saw oscillating cam Hit and the chuck indexing cam I52, a reduced portion 305! of shaftv I26 is provided with a disc 3&2 the periphery of which is engaged by a suitable brake lining 304, of a brake band 386, adjustably clamped against the disc periphery by nuts 3% which are threadedly received by a bolt 3ft, projecting from the main bracket Eli.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

I claim: I

1. In a device of the character described, the combination of a rotatable work-holding, chuck; means for indexing the chuck; a swinging frame;

a rotatable shaft carried by said frame; a cutter L on the shaft; another shaft parallel to the first mentioned shaft and spaced from the axis of rotation of the frame; means on said other shaftfor oscillating the frame; and a driving connection between the two shafts, said connection ineluding a third shaft between said two shafts and,

at right angles thereto, and meshing gears on all shafts.

2. In a device of the character described, the combination of a rotatable work-holding chuck; means for indexing the chuck; a swinging frame; a power rotated shaft carried by said frame; a cutter on the shaft; another shaft parallel to the first mentioned shaft and spaced fromthe axis of rotation of the frame; means on said other shaft for oscillating the frame; and a driving connection between the two shafts, said connection including a third shaft between said two shafts and at right angles thereto, meshing gears on all shafts and a clutch.

3. In a device of the character described, the combination of a rotatable work-holding chuck; means for indexing the chuck; a swinging frame; a power rotated shaft carried by said frame; a cutter on the shaft; another shaft parallelto the first mentioned shaft and spaced from the axis of rotation of the frame; means on said other shaft for oscillating the frame and for operating the indexing means; and a driving connection between the two shafts, said connection including a third shaft between said two shafts at right angles thereto, meshing gears on all shafts and a clutch.

4. In a device of the character described, the

combination of a rotatable work-holding chuck,

axis of rotation of the frame;

means for indexing the chuck; a swinging frame; a power rotated shaft carried by said frame; a cutter on the shaft; another shaft parallel to the first mentioned shaft and spaced from the means on said frame-and for a driving consaid connection other shaft for oscillating the operating the indexing means; nection between the two shafts,

including a third shaft between said two shafts.

angles to said other shaft, the other end of said member being guided for movement in said plane; a driving connection between both shafts,

said connection including a shaft in the mem-' her and carrying a worm, and a worm gear on said other shaft; an anti-friction roller the axis of which is'located in a plane which is rectangular to the shaft in the member and in which the axis of the worm gear lies; and a spring urged plunger urging the member away from the worm gear and into engagement with the roller in which position the worm is in proper mesh with the worm gear.

6. In a device of the character described, the combination of a rotatable chuck for holding a commutator; an oscillatable and power rotated tool for cutting notches into the segments of the commutator; means for indexing the chuck to present consecutive commutator segments to the tool; rotary means for operating the indexing means; a driving connection between the power rotated tool and said rotary means, said connection including a clutch; means for automatically disengaging the clutch after all segments of the commutator have been notched; and means permanently frictionally braking rotation of'said rotary means. i

'7. In a device of the character described, the combination of a rotatable disc; equi-angularly spaced projections carried by the disc, and. a rotatable cam adapted to cooperate with consecutive projections in order to index the disc.

8. In a device of the character described, the combination of a rotatable disc; equi-angularly spaced pins projecting from the disc; and a rotatable drum having a peripheral cam groove adapted to cooperate with consecutive pins in .the latter in clutch engaging position while coorder to index the disc. I

9. In a device of the character described the combination of a rotatable disc; equi-angularly spaced pins projecting from the disc; and a rotatable drum having a peripheral cam groove adapted to cooperate with consecutive pins, said spaced pins projecting from the disc; and a ro-' tatable drum having a peripheral cam groove adapted to cooperate with consecutive pins, said camgroove being composed of a spiral groove portion merging into another groove portion lying in a plane at right angles to the drum axis and a second spiral groove portion parallel to the first said spiral groove portion and merging from said other groove portion, the distance between the two spiral groove portions and their coordination being such that two consecutive pins may be simultaneously received therein and moved thereby upon rotation of the drum.

11. In a device of the character described, the combination of a rotatable disc; equi-angularly spaced pins projecting from the disc; and a rotatable drum having a peripheral cam groove adapted to cooperate with consecutive pins, said cam groove being composed of two opposite parallel spiral groove portions joined midway between the entrances to both groove portions by another groove portion lying in a plane at right angles to the drum axis, the entrances to the spiral groove portions being aligned in the direction of the drum axis and spaced apart a distance substantially equal to the clearance between two pins which are consecutive to a third pin therebetween.

12. In a device of the character described, the combination of a rotatable workholding chuck; means for indexing the chuck; an oscilllatable and power rotated tool for notching the work;

rotary means for operating the indexing means and'for oscillating the tool; a driving connection between the tool and the rotarymeans, said connection including a normally disengaged clutch; a manually operable clutch engaging arm; and means including a cam carried by the chuck for retaining said arm in clutch engaging position for one revolution of the chuck.

13 In a device of the character described, the combination of a rotatable work-holding chuck; means for indexing the chuck; an oscillatable and power rotated tool for notching the work; rotary means for operating the indexing means and for oscillating the tool; a driving connection between the tool and the rotary means, said connection including a normally disengaged clutch; a manually operable clutch engaging arm; a cam disc having a single depression in its otherwise concentric periphery and being carried by the chuck; and a link cooperating with the cam pe-' riphery and connected to the arm for retaining operating with the concentric portion of the cam periphery, and controlling clutch disengagement when cooperating with the cam depression.

L. E; POOLE.

Images