US1720966A - Armature-core-insulating machine - Google Patents

Description

July 16, 1929. l.. E. POOLE 1,720,966

ARMATURE GORE INSULATING MACHINE 1 'Original Filed April 24, 1926 4 Sheets 5het 1 July 16, 1929. E. POOLE l720,966

ARMAT-URE CORE INSULATING MACHINE Original Filed April 2,4, 1926 4 Sheets-Sheet 2 July 16, 1929. l.. E. POOLE 1,720,966

` ARMATURE CORE INSULATING MACHINEv l original Filed April 24', 1926 4 sheets-smal 5 C12Q. l/2.

l 3mm July 16, 1929. l.. E. POOLE 1,720,966

v ARMATURE COREy INSULAING MACHINE Original FiiedApril 24, 192e. 4 sheets-sheet 4 Patented July 1, i929.

UNITED STATES PATENT OFFICE.

LORA E. POOLE, OF ANDERSON, INDIANA, ASSIGNOR TO DELCO-R-EMY CORPORATION, 0F DAYTON, OHIO, A'CORPORATION OF DELAWARE.

.ARMATURE-CORE-INSULATING MACHINE.

Original application filed April 2,4-, 1926, Serial No. 104,404. Divided and this application iiledaanuary 28, 1928. vSerial No. 250,283.

lThis invention relates to themanufacture of. armatures 'for dynamo electric machines, `and particularly to the insulation of the armature cere slots and of the conductors located within these slots.

The present invention is a division of application Serial No. 104,404 filed April 24, 1926, for an armature core insulation machine, comprising means for rotatably supporting la slotted armature core, means for' folding a Hat strip of insulating material into such form that it may be passed into the slots of the armature corev and will there q'irovide insulating` recesses extending.;` longitudinally of the core 'for receiving the conductors which are received by the slots of the core, means for automatically feeding the folded insulation strip into the core, means for severing that portion of the strip within the core from the remainder. and means for intermittently rotating the core in order to locate its various slots in alignment with the free end of the olded insulation strip. l

lt is particularly an object of the present invention to provide a novelfmethod and apiLia-ratas ior folding a fiat strip of insulating material for the purpose specified in the i'oregoing paragraph.

Further objects andadvantages of the present invention will be apparent from the Aiollowing description, reference being had to the accompanying drawings wherein a preferred embodiment of one form of the invention is clearly shown.

In the drawings:

Figs. 1 and 2 are fragmentary plan and sideelevations respectively of apparatus for folding a strip oi insulating paper accord ing` to the present invention.

Figs. 3 to 10 are fragmentary sectional views taken on the lines 3-3 to 10-10 respectively of Fig. 2.

F ig. 11 is a sectional view on the line 11-1l of Fig. 1.

Fig. 12 is a fragmentary side View of a mechanism for intermittently rotating the feed rolls and is partly in section, the section being taken on the line 12-12 of Fig. 13.

Fig. 13 is a. sectional view on the line A713-13 of Fig. 2.

1li is a sectional view on the line Fig. 15 is a sectional view on the line 15-15 of Fig. is. s

Fig. 16 is a. sectional View of a collet chuck.

Fig. 17 is a sectional view of a device to push the insulation into the armature slot after it has been severed.

Fig. 18 is an end view oi' the armature looking in the direction ofthe arrow 18 in Fig. 17.

Referring to Figs. 3 to 10 inclusive7 the method ot folding the paper to form slot insulation. pieces will first Vbe described. The flat strip of paper designated by numeral 20 in Fig. 3 is unwound from a. supply roll (not shown) and is passed over a trough 21 which pivotally simports a weight member 22 tending to maintain the paper 2O flat within the trough. The paper .is drawn from left to right as viewed in Fic'.

2, and when it arrives approximatelyat the plane 4l-t of Fig. 2 it is passed between members or dies 23, 24, 2,5 and 2G where its cross sectional shape 20a becomes one which is similar to a slanting N. When the paper arrives atr the .sectionv plane .5-5 of Fig. 2 it will pass between members 23, 27, 28 and 29, which lcauses the paper to be folded so that its cross sectional shape 201 resembles that of a slanting'N having less inclination to the vertical than in Fig'. 4. Ity will be noted that the part 23 in Fig'. 5 is the same member as part 23 in Fig. 4l but its crosssectional contour Vgradually changes from 'that shown in Fig. 4- to that shown in Fig. 5 in order that the paper will be given a different shape as it progresses from the lett toward the right. When the paper strip arrives at the plane 6-6 in Fig. 2 it passes between forming and feeding rolls 30 and 31 which giveit the. cross-sectional shape 20 which might be characterized by likening it to an inverted U joined to an upright l'U or to a recmnbent S. After the paper leaves the rolls 30 and 31 it passes into a. flaring mouth 32 of a tunnel or die 33 which is oblong in cross-sectional shape with rounded ends as shown in Fig. 7. This tunnel 33 is provided by grooving two blocks 34 and 35 and placing them together as shown. The movementof the strip through the tunnel causes its shape to change from its cross sectional shape 20c to the cross-see tiental shape 2cd. the latter resembling a relatively narrow upright- S or a reversed S :ucordingl to the direction in which the view is taken. After leaving` the tunnel the strip passes through a guide passage 36 provided in a rotatable work holder 40 which receives and supports an armature core 37 carried by a shaft 38 and provided with a plurality of slots 39. As the strips 20 are inserted into the slots 39, they are maintained in contact with the bottoms of slots, for a purpose to be described later, by band 37:L which is placed tcniporarily around the armature core 37. The band 37'LL is provided on its inlerior with longitudinally extending ribs 237 which are -spaced so that each will be received by a core slot 39.

Referring to Fig. 11, the work holder 40 is a cup-shaped member having a horizontally disposed shank 41 rotatably supported by a bearing 42 attached to a bracket 43 which is mounted upon the base plate 44. of the machine. Endwise movement of the shank 41 is prevented by the engagement with the bearing 42 of a shoulder provided by the shank 41 and by a nut 46 engaging the threaded end 47 of the shank. The shank 41 is tubular and receives a rod 4S having,` a central recess 49 for receiving the armature shaft 38. rThe recess 49 is surrounded by three resilient spring arms 50 integral with the rod 48. These arms coopcrate with an internal conical surface 51 provided by the shank 41. Thus the shank 41 and the resilient members 50 constitute a collet chuck for gripping the shaft- 3S when the rod 4S is pulled toward the left so that the ends of the chucking jaws 50 will be forced against the conical .surface 51 and will grip the shaft 38. The rod 48 is threadedly connected with a flanged nut A spring- 58 located between the nut 52 and the nut 4G urges the rod 4S toward the left so that the shaft 3S will be gripped by the members 50. ln order to release the chuck so that the core and shaft may be removed from the machine, the operator will press a pedal (not shown, but connected with a lever 54) causing, it to move in a clockwise direction. Levers 54 and 50 are attached to a shaft 55 .supported by the. base 44. Lever 50 is provided with a hole 57 which receives a pin 58 connected with a plate 59 which adapted to bear against the nut 52. Obviously7 downward movement of the lever 54 will be transmitted through the shaft 55 and the lever 50 causingi it to move toward the right in order to compress the spring' 53 and relieve the chucking jaws 50 from wedging' engagement with the shank 41. The interior of the cup 40 is provided with a rib 60 which will be received by one of the core slots in order to locate the core properly relative to the work holder.

The trough 21 is supported by a bracket and the guides 34 and 35 are supported by abracket 06 and the bracket 43.

The. feeding and folding rolls 3() and 3l, are drivingly connected with shafts and 71 respectively and are maintained in drivingy engagement therewith by nuts 72 and 73 respectively, engagingl threaded ends of the shafts. vrlhe shaft 70 is journaled in l'Jea-ring` blocks 74 which are supported for vertical sliding,l movement by a bracket 75 supported by the base plate 44. Each bearing` block 74 is yieldingly urged downwardly by spring 7G which bears at itsI upper end against a washer "'7 bearing` against a nut 78 threadedly connected with a rod 79 having its lower end connected with a plate S() which is attached by screws Sl'lo (he bracket- 75. V1he lower end of the spring 7G bears against a disc 82 having studs 83 connected therewith, each stud 83 passingy through a hole 84 in the plate 80 and bears at its lower end against the block 74. The shaft. 71 is supported by bearings 85 carried by the bracket 75 and is drivingly connected with the shaft 70 by gears 80 and 87 connected respectively with shafts 71 and 70. The shaft 71 is supported also by bracket 89 mounted on the base plate 44.

The mechanism for imparting .intermittent rotary motion to the shaft 71 in a clockwise direction as viewed in Fig. 12, coinpriscs a ratchet attached to the shaft 71 and engageable with a plurality of pawls 91 each mounted on a stud 92 supported by a disc 98 which is rotatably supported by the shaft 71 but is not drivingly connected therewith. Each pawl is urged toward the ratchet by a leaf spring 94 fixed at 95 to the periphery of the disc.A rPhe disc 93 is oscillated by a link 9G connected at one end with the dise and at the other end with a lever 97 rotatably supported by a stub shaft (5% carried by bracket 99 which is supported by the base 44. The lever 97 carries a. cam following roller 100 which is received by a slot 101 of a drum cam 102 which is mounted on a shaft 103. Obviously, for each rotation of the shaft 103 there will be one complete oscillation of the lever 97 and link 96. rIbis movement will produce rotation of the feed rollers 30 and 31, then a backing' up of the pawls by movement in. a counterclockwise direction preparatory to the next feeding;l operation.' r1`he ratchet 90 is prevenled from backing up by a friction device imrludinpr a drinn 104 attached to the shaft 71 and engaged by a split clamping band 105 which is prevented from turning by the engagement of one of its lugs 107 with a post 106 attached to the base 44. lhe band 105 is urged into frictional engagement with the drum 104 by a spring 108 bearing against a lug 109 of the clamp and the head of a screw 110 which passes through plain holes in the lugs 107 and 109 and threadedly engages the post 106. Turning the screw 110 will vary the friction pressure exerted by the clamp 105.

Due to the rota-tion of the rollers to feed the paper endwisc as well. as to perform one of the steps of forming it, a portion of the strip of paper is fed through one of the guide passages 3G in work holder 40 into an arniature core slot 39 in alignment therewith. This portion is severed from the remainder of the strip by means includingl a shear block which cooperates with a slidable knife 151 which is guided by a bracket 152 attache-d to the bracket Soon after the end of the paper feeding operation, the knife 151 will shear the paper at the adjacent edge of the shear block 150.

After the shearingY operation, the operation ofk rotating; the work holder 10i in a connterclockwise direction, as vviewed from the right of Fig. 11, performed in order to bring the ncxtcore slot 39 opposite the tunnel 233. 1t will bc understood that the shear block 150 is provided with a groove forming an extension of the groove in the bloclel so that the blocks 3L]- and 15() may cooperate with the block 33 to provide a tunnel forming an extension of the tunnel provided by the blocks 33 and 84 as dew scribe-d with reference kto Fig.

lt is therefore apparent that each cycle ot operation of thc machine includes feeding a folded strip of paper into an arii'iaturc coro slot, the severing of that port-ion of the paper within the arn'iaturc core from the remaining portion, and the turning of the armature core relative to the paper feeding,- means in order that the next core slot to be insulated will be brought into alignment with the passage 33 through which the insula:l ion strip is guided into the armature core. During the feeding operation7 a portion of the strip of paper is being' folded preparatory to being fed into the armature core during` a succeeding` feeding of the operation. The machine will operate continuously until all of the armature core slots have been provided with insulation pieces.

Referring to 1T igs. 2 and 11, it will be apparent that it is not practical to locate the cuttinp,r edge of the knife bar 151 in the same plane as the left hand end of the armature core; therefore a portion of the strip 2Od measured by the distance between the plane ot the cutting edge of the knife bar and the plane of the left hand end of the ari-nature core will project beyond the left hand end of the bar. 1t is desirable to shove substantially all of the insulation pieces d th rough the core slots in order that the ends of the strips may be received by closed slots 190 located in alignment with the slots 39 of the armature core and provided in a non-cond ducting disc 191 located adjacent that end of the armature core which is to be remote from the commutator. The function of the disc 191 is to assist in maintaingv the armature conductors within the core slots. rlrhe insulating' disc 191a which is placed against the end of the core which is to be adjacent the eonnnutator may have open slots, since the soldered connections between the armature conductors and commutator risers will suflice to retain the conductors at the coinmiiitator end of the core. After each insulating strip 2Od has been pushed througijh the core so that yits right hand end will be received by a closed slot 190 of the noni-onducting disc 191 that end will be prevented from coming,` out of the armature core. 1t will now be apparentthat the ring` 37 will facilitate movement of the insulation pieces through lthe closed slots of the end non-conducting' disc 191. since the ribs 87h provided by the ring 37 maintain the strips 20d against the bottoms of the core slots Si.

After the strips 2O(l have been moved past the shear blmzk 150 they are shoved further toward the right in Fig'. 11 by means includin g` a bar 192 (see Fig. 2) which is slidably supported by guide block 193 for cndwise movement parallel to the direction of movement of the strip 29l. v Endwisc movement Ot the bar 192 toward the strips 20 in order to push them further into the armature core is produced by a plate cani 19a having a beveled surface 195 which cooperates with a beveled surface 199 which defines a notch 197 with which the bar 192 is provided for receivii'ig the cam 1941s.

By a suitable mechanism (not shown) the cam 1941 is moved iupwardly as viewed in Fig. 2 in order to move the bar 192 toward the right. A spring 199 which is located between a. stationary block 193 and a shout der 200 of a rod 201 ctmnectcd in any well known manner not shown with the bar 192, tends to move the bar toward the left.

1n order to facilitate threading the end of the paper strip after it' leaves the feedingl and folding` wheelsI 30 and 31 into the tunnel 33 between the blocks 38 and 3ft-,as shown in 1V ig. 1, the guide block 33 mounted to rotate about a vertical pivot stud 210 which is supported by the bracket 43. The `guide block .is maintained in the position shown by a U-shaped clip 211 having its branches engaging' its vertical outsides of the guide blocks 33 and 3st.

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

1ilVhat is claimed is as follows:

1. rPhek method oit' making; arniature core slot insulation pieces from a flat strip which consists in progressively changing,` its crossseet-ional sha-pe :from flat to htshape and from N to that of a U joined to an inverted U, and in compressing the U portions in a direction transverse to the axes ot the Us while perniitting the work to elongate in the direction ot the axes et the Us, whereby to toi-m a piece having a cross-sectional shape which resembles a vertically elongated S.

2. The method ot making arn'iature core slot insulation pieces which comprises tolding' a lat piece into one having a cross-sectional shape resembling a `d joined to an inverted U, and in compressing the U portions in a direction transverse to the axes ot the Us while permitting the werk to elongate in the direction ot the axes of the ts whereby to form a piece having a crosssectional shape which resembles a vertically elongated 55.

Apparatus tor making armature core slot insulation pieces from iat material comprisingH in con'ibination, folding devices which gradually change the cross-sectional shape ot the work trom flat to N-shape, devices tor changing the cross-sectional shape ot the work from the N-shape to that oli a U joined to an inverted U, and devices for compressing the' yU-portions in a direction transverse to the axes of the Us while permitting the work to elongate in the direction ot the axes ot the Us, whereby to form a piece having a cross-sectional sh ape which resembles a vertically elongated S;

si. Apparatus according to claim 3 in which the U torming devices include a plurality of rolls between which the material is gripped and is caused to move endwise relative to the other forming devices.

Apparatus according to claim 3 in which one of the sets otl shaping devices includes a pair of rolls between which the material is gripped and is caused to move endwise relative to the other `Forming devices.

6. Apparatus according to claim 3, i in which one ot' the sets of shaping devices includes a pair ot' resiliently mounted rolls between which the material is gripped and intermittently fed endwise relative to the other forming devices.

7. Apparatus tor making armature core slot insulation pieces from flat material f comprising, in combination, driving means7 folding dies which changev the crossscctional shape ot the work from flat to N- shaped, feed and forming rolls driven by the driving means feeding the material through the dies and Jforming the N-shape to that of a 1U connected to an inverted U and dies for compressing the U-portions in a direction transverse to the axes ot the Us while permitting the work to elongate in the direction ol the Us7 whereby to form a piece having 'a cross-sectional shape which resembles a vertically elongated 8.

S. Apparatus according to claim `7 in which the driving means are intermittently operated.

9. Apparatus tor making armature core slot insulation pieces trom a web ot flat material comprising, in combination, folding devices which gradually change the crosssectional shape ot' the work from flat to N- shape, t'eed and torn'iing rolls feeding the work through the 'folding devices and torming the N-sliape to that oitl a U connected to an inverted t?, driving means 'for said feed rolls, devicesl ttor compressing the. `U-portions in a direction transverse to the axes olf the Us while permitting t-he work to elongate in the direction of the axes of the Us, whereby to torm a cross-sectional shape which resembles a vertically elongated S, and means tor severing the work into core slot insulation pieces.

10. Apparatus according to claim 9 in which the driving means intern'littently drive the feed rolls and in which the severn ing means is a reciprocating blade operating during the rest period ot the feed rolls.

In testimony whereof I hereto al'hx my signature.

LOBA E. POOLE.

Images