Note: Descriptions are shown in the official language in which they were submitted.
~OS~:lL79 ~
The present invention relates generally to new - :
and improved coil placing apparatus and methods o~ ~ :
conditioning such apparatus or placing coils in axially
extending slots of cores having different preselecte~ axial
lengths.
Machine3 for axially placing coils along axially ex-
tending slots of magnetic cores are utilized substantially
throughout the fractional horsepower~ di~tributed wound, -
induction motor industry. A number of different patents
have now issued which show and describe details of coil
placing or injecting equipm2nt, One such patent, for :
example, is D,E, Hill U,S, Patent ~o,39324,536 which was
granted June 139 1967, Two other U,S, patents (both of
which are a~igned to the assignee of the present application)
that show and describe noteworthy advances in the art are .:~.
Smith U.S, Patent No, 3,698,063 which issued October 17, .
1972; and Lauer et al ~,S~ Patent No, 3~8297953 which
issued August 20, 1974, The Smith and the Lauer et al U,5, -~
pate~tC described apparatus and approaches whereby among
other things, rapid set-ups may be accomplished to permit the
placing of wound coils alony slots of cores having different
stacX heights, Another U,S, patent, which identifies the
desirability of avoiding long and laborious set-ups is
Walker U.S. Patent ~o, 3,505,721 which issued April 14~1970,
While the approache~ taught by Smith and Lauer et al
are extremely useful and valuable in practice, it continues to
~ 03--A0--4557
:~05~ L79
be desirable to provide methods and apparatus whereby previously -
existing coil injection equipment may be retrofitted to permit
shortened set-up times, even though all of the advantages of the
Smith and Lauer et al approaches may not be obtained. It also
would be desirable to provide means and methods that may be used
in conjunction with relatively sim~le and unsophisticated coil
injection equipment.
The above referenced ~alker patent is an example of
one effort that has been made to provide one specific mode for
modifying coil injection equipment for different core stack
heights. The approaches suggested heretofore, however, would
require relatively complex and expensive set-up tools and also
would require that axially e~tending fingers or blades of the
injection tools have a large number of extra machining operations
performed thereon.
During the process of axially injecting wire turns
(e.g.j coils) into magnetic core slots, a plurality of wire
segments are moved along axially extending gaps defined by
adjacent blades or fingers. It is ~nown that, during such a
2~ process, frictional forces of relatively great magnitude are
applied to both the wire segments and to the gap defining blades.
Tllese forces are exerted on the blades in a direction that would
tend to shift the blades in an axial di~ection. Because of this,
it is desirable to tightly and secureIy lock the bIades against
undesired axial movement relatively to each other and relative
03-~0-4557
79
to blade holding means during normal machine operation, and yet
permit axial movement of the blades in a blade pack during a -
set-up operation.
In one of the prior approaches, referred to herein-
above, a spring biased locking pin is received with a slip fit
in one of a plurality of locking holes along a blade (or finger).
It will he appreciated that, eventually, such slip fit could
contribute to a somewhat loose interconnectivn between such
blades and the means for holding such blades; with the ultimate
result that undesirable movement of such blades might occur dur-
ing machine operation. Moreovex, when slip fit locking pins
are utilized it of course is necessary to make the pins of a
; proper size to insure against inadvertent shearing of the pins.
Accordingly, it would be desirable to provide new and
l 15 improved coil injection apparatus, and methods of modifying the
fl geometric relationships between parts of such apparatus, where- ~-
by inadvertent relative movement of such parts may be avoided.
It would be particularly desirable to provide an arrangement
- whereby such parts are positively locked in position relative - ~;
to one anottler during set-up of the apparatus. It would also
be desirahle to provide improved coil injection equipment wherein
gap defining elements (e.g., blades or fingers) may be adjusted
: quickly and readily with relation to an injection machine frame
or base in a facile manner, preferably with a simple set-up or
~ 25 adjusting tool, so that coils may be placed in slots of magnetic
... - . '
' ~'
.
''`' '; ,
` ~Sll~9
cores having different predetermined ~tack heig~ts.
. ` - .
` Summary of Ehe Invention
Aceordin~ly, an object of the present invention is to
provide l~ew and improved coil placing equipment which may be
- 5 rapidly and easily set-up for placing coils in slots of cores
having different prede~erm~ned stack heigllts (i.e., axial length~).
Another object of the present invention is to provide
new and improved coil placing apparatus, and methods of settin~
up the sa~e, wherein gap defining elements are securely locked
in predetermined axial positions relative to one another and retain-
``, ed in such locked condition while being moved axially to different
~ positions to accommodate magnetic cores having p~edetermined
different stack heights.
Still another object of the present invention is to
provide an improv~d method of adjusting the axial position of
a plurality of coil injection machine gap defining members, ~;~
,~ by axially moving a lDeans for holding ~he members in predetermined,
. ,
mutually relativelv fixed, axial positions
In carrying out at least some of the above and other
objects of the present invention in one preferred form thereof, ~-
~ I provide a method of adjusting the axial position of a plurality
of coil injection machine gap defining members relative to another
part of the machine (e.g., the base or frame), by securely inter-
locking a number of the eap deflning ~ne~llbers against movement
,., , . . ~
. , ,
,
~ _4_
'' ' : '
.' .
, ~, .
`
:~ ~ ~ 9
; relative to one another. Then~ while such melnb~rs are so inter-
locked and while desi.red interrelated axial relationcihips there-
between are m,~intainecl; I axially move the interlocked members
desired amo~m~iin preparation for injecting coils into cores of
predetermined stack heights. ~referably, I interlock such members
with a blade holding means, and $hen axially move such means.
In one preferred form, the mean~ for holding the plurality of
gap defining members in interlocked relationship includes a
; threaded sleeve that is normally con~trailled from axial move-
ment by a second member threadingly engaged therewith and also
consrrained from axial movement. Rota~ion of the second threaded
;~ , .
.. ~; member will ~hen cause the ~hreaded sleeve to move axially, and, ~ :
due to the interlocking relationshlp between the sleeve and the
~ gap defining members, such members are moved axially relative to
'!
the machine frame. In one illustrated form o~ apparatus, the
" interfitting relationships between the gap defining members and
other axially extending members ~for example, wedge guides)
constrain the gap defining men~bers from rotating, but permit
.
,i, axial movement o~ the gap defining members.
. 20 In apparatus-exemplified herein, a coil injection
machine includes a base or frame, a plurality of elongate axially
,
~ extending blades that at least partlally establish a plurality
. .
of turn receiving gap.s, a blade holder interlocked with the
plurality of blades, and a blade holder actuating means that is
.^ 25 useful for moving the blade holder (along with the blades) axially
'~ , ;' .
. .:
. . :
` ~ 03-A0-4557
`:
~L~51~79
., - .
relative to the frame. The blade holder includes a threaded :
surface intermeshingly engaged with another threaded surface that .
` is constrained from axial movement relative to the rame, and yet
:`` is free to rotate relative to the frame. The blade holder is ::
free to move axially relative to the frame but constrained from : .
~ rotation relative to the another threaded surface. The another ~:
: threaded surface may be an external surface of a sleeve.
The subject matter which I regard as my invention is
particularly pointed out and distinctly claimed in.the concluding
portion of the specification. ~y invention itself, however,
together with further objects and advantages thereof, may best
be understood by referenc.e t.o the following descripti.on taken
in connection with the accompanying drawings.
Brief Description of the Drawings
,; :
Figure 1 is an exploded perspective view of parts
of apparatus that embody the present invention in one preferred
.~l form thereof t and which may be utilized to practice the invention
, in another preferred form,
~ Figure 2 is a side elevation, with parts in section
20 and parts removed, of apparatus that includes the tooling of ~.
Figure l;
Figure 3 is a view taken along the lines 3--3 of
: Figure 2, assuming Figure 2 to have been shown in full;
.~. Figure 4 is a mechanical, somewhat schematic view
~ 25 of apparatus that includes the s~ructure of Figure 2;
"
, :
'
.
03-A0-4557
,~
I~S117~
Figure 5 is a side elevation, with parts in section
and parts broken away, of a tool that may be utilized to set-up
; the structure shown in Figure 2; and
Figure 6 is a side elevation, with parts in section
and parts removed, of the apparatus of Figure 2, parts of a
;~ magnetic core and parts of winding turns to be placed in the - `
slots of the magnetic core.
Description of the Preferred Embodiments
In Figures 1-3, there has been illustrated parts
~i 10 of improved apparatus 10 for inserting sida turn portions of
i; .:
wound electrical coils into predetermined axially extending slots
of a magnetic core. The apparatus 10 may be used, if desired,
for inserting insulators ~e.g., wedges) of appropriate length as
~:l the wound coils are placed in the core. At least portions of a
core and of coils have been shown in Figure 6, as will be described
in more detail hereinafter.
I The apparatus 10 includes a machine fram~ or base that
-~ includes a support plate 11, a portion of which is illustrated ~-
in Figure 2, and a wedge guide housing assembly 12. The wedge
guide housing assem~ly 12 includes a locating plate 13 which
... .
is fastened, by means of a plurality of screws 14 to a wedge guide
:'1 ' .
i housing 16.
With reference to Figure 1, the wedge guide housing 16,
.
; include~ a plurality of grooves 17 and a nu~ber of co~mtersunk
~ 25 holes 18. Wedge guides 19 may ~e slid along the grooves 17 and
~ ''''' '
... .
''' '` '~ .
.:' .
... . .
~ ' ' .
03 A0 4557
,
``
~Ir)51~79
.~; then fastened to the wedge guide housing with any suitable
fasteners, e.g., screws 21.
. It should be understood that apparatus and methods
embodying the invention may be put into practice with equipment ..
~;~ 5 wherein wedge guides are not provided, or with equipment sub-
stantially as illustrated herein but wherein a wedge (or insula-
tor) placing operation is.not carried out. Thus, description
herein pertaining to wedges, wedge guides, etc., is presented only
~` for the purpose of illustrating what is presently believed to be
.,~.
~` 10 the preferredr or best, mode of carrying out the invention.
~, The tooling assembly or package, exemplary parts of
. .,
~-.......... which are shown in Figure 1, includes a plurality of the wedge
guides 19 (as will be more apparent from Figure.3); and also
includes a numher of relatively fixed, axially extending, gap
defining mem~ers. that have been illustrated as blades ~or fingers)
22. In the illustrated embodiment, all of the blades 22 are nor-
mally mutually interlocked with a.blade holder 31 to prevent rela-
tive axial movement there~etween. ~owever, the present invention
may also beutilized with equipment wherein selected ones of the
blades 22 are mounted to structure other than.blade holder 31,
f~r movement relative to selected other ones of the blades 22.
It is noted -that a number of the members shown in Fiyure
: 1 are provided with internal or external threaded surfaces.
. Some of these members are threaded along one another, while
others accommodate one another with. a slip fit. For example, the
. outer diameter of a sleeve Z4 is accommodated with a slip fit along
~', ,.
.
,
~ 03 ~0-4557
'
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.. ~
`` 1053~L79
j-- the inner surface 26 of the blade adjusting nut 27. On the other
hand, the externally threaded portion 28 of the blade adjusting
- nut 27 threadingly engages the threaded internal portion (or ;.. :
.` surface) 29 of the blade holder 31. The blade adjusting nut 27
is threaded substantially along the entire outer axial length
.~' thereof, and the blade holder 31 is threaded along the inner sur- ..
. face thereof for substantially its entire axial.exten-t. : :
~; The sleeve 24, on the other hand, only ~eeds to be
~.~.-` .. .
threaded along the upper end thereof to permit engagement with a ;
. l0 lock nut. Then, after assembly of the parts as illustrated in
Figure 2, a washer 32 i5 placed over the free end of the sleeve ; `
24, and a spanner nut 33 is threaded therealong so as to trap :
~ the bIade adjusting nut 27 between the washer 32 and a shoulder
.~ 34 of sleeve 24, thereby to constrain movement of the blade ad-
.. , ~
~.3 15 justing nut 27.axially reIative to the sleeve 24.
.
,~i The blade adjusting nut 27 is threaded into the blade
holder 31 until in a first assembly step. Thereafter, it is pre- :.
~ ferred.to assemble the ~lades 22 to the blade holder 31 by means ::
:l of a number of scre~s 36. .:
.1 .
It will be understood.that round fastener receiving
holder 37, 38 are shown in the blades 22 and ho.lder 31, however .~
elongated slots may be provided in lieu of round holes in the ~. :
blades so that an initial axial adjustment of the blades rela- ~ :
tive to each other and the blade holder 31 may be accomplished. .
In any event, once the blades are positioned in the desired manner j.
,
; ::
_ g _
:, :
:~ :
~ . . . . . . .
03-A0-4557
'''`
~L~51:~79
.~.,,
,, relative to the kolder 31, the blades are held in locked axial
:; positions relative to each other, and to the blade holder 31.
` The wedge guides 19 may be fastened to the wedge guide
,
.~ housing 16 (e.g., with screws 21) before or after assembly of the
blade holder 31, blades 22, sleeve 24, and blade adjusting nut
27 with the housing 16.
., The sleeve 24 is assem~led with the wedge guide housing
16 by inserting it from the bottom of the housing (see Figure 2)
. until a flange 39 thereof bears against a mating surface 41 of ~:
: 10 the locating plate 13. Means such as screws 42 (only one of
which is shown) are then inserted through holes.43 in the sleeve
flange and threaded into.the locating plate 13 to secure together
; the locating plate 13 and sleeve 24. It will now be understood
that screws 14 hold the plate 13 and housing 16 in assembled
relation.
,, .
The assembled together blade holder 31, blades 22, and
blade adjusting.nut 27 are slipped into the.center of the assembly
wedge guide housing 16, with the internal surface of the blade
adjusting nut 27 sliding along.the external surface of the sleeve
; 20 24 until the end 44 of the blade adjusting nut bears against the
shoulder 34 of the sleeve 24~ During this assembly step, the
, notches or grooves 46 of the ~lades.22 are aligned with grooves
17 of the housing 16, to provide a desired aligned relation with
a corresponding wedge guide 1~. ~he washer 32 then is placed
:~ 25 over the free end of the sleeve 24, and spanner nut 33 is
tightened on the threaded portion 47 of the sleeve 24 so as to
, `
~' !
-- 10 -- '
. I ''
. . .
'. . ': ' , ' ' ' . '" ' '' ' . " ' ' . ' ~ ' :, ' . .
~ 03-A0-4557
~ .
. :~; , - : . .
~IS1~1L79
lock and hold the blade adjusting nut 27 in a fixed axial .
.. .: - .
position relative to the sleeve 24, locating plate 13, and :.
~.i machine frame part or plate 11.
;` The relationship of the assembled parts will be best
understood by referring exclusively to Figures 2 and 3. It will
be noted that the sleeve 24 has assembled therewith two bronze
bushings 48, 49 which are press thereinto. Prior to positioning ;~
the assembled tooling of Figure 1 onto the machine frame plate 11,
. an actuator guide tube 51 is fastened to the.base plate 52 by ~-
.: 10 being inserted through an opening 53 in the ~ase plate until a
~; -
........... shoulder 54 formed thereon seats against the bottom of the plate
: 5~. Thereafter, a lock nut 56 is threaded onto the actuating
- mem~er guide tuhe 51 so as to lock the guide tube in fixed posi- : :
tion on the plate 52. The too:ling package.of Figure 1 is posi- ;
;,` 15 tioned axially along the actuator guide tube 51, with :- the outer
diameter of the actuator gu~de tube sliding along the bronze
.. . . ..
~. bushings 48, 49. .~
.;, .
.. All of the actuating members for the apparatus 20 have x .
. not been shown herein in o.rder to simplify illustration, but it .:
. "
~ 20 will be understood that details of such structure are shown in a ~
.,
number of issued patents which are assigned to the assignee of
~; the present invention. Exemplary ones of such U.S. patents are
': :
.' Smith U.S. Patent 3,638,063 dated October 17, 1972; Arnold
. U.S. Patent 3,672,039 dated June 27, 1972; Lauer and Pieper
U.S. Patent 3~829,953 dated August 2Q, 1974; and .
Arnold U.S. Patent 3t722,063 dated March 27, 1973.
~ .
.' .,.
,,'
, ',.
03-A0--4557 ~-
r
79
,,, ~ .
The tooling assembly is clamped, as will be understood,
~ .
to support plate 11 with clamp arms 57 and clamp bolts 58. The
housing 16 is relatively loosely clamped, so as to permit ro-
tational indexing movement of the tooling assem~ly when a not
sho~n rack inter engages with and drives ring gear 59 which is
:.
astened to housing 16. Such indexing movement would be provided
for the convenience of an operator, and further details thereof
are not presented herein. It is noted, however, that shot pins
carried in base 52 will latch with notches 61l 62 (See Figure 1
of plate 13 so as to positively locate the tooling assembly in a
desired posi-tion following each one hundred and eighty de~ree
index.
With reference now to Fiyure 6, winding turns 63, 64
will be draped along the blades 22 and accommodated in gaps 66
(see Figure 3) between preselected adjacent ones of the blades
22. A stator core 67 is then positioned over the extending ends
68 of the blades 22~ clamped in place with not shown clamps; and
the actuator then is moved axially upwardly so as to drive a
device, such as a stripper 69, with pusher blades or fins 71
carried thereby, moving axially along the gaps; thereby to insert
the winding turns in slots (e.g., slots 72, 73) of the stator
core 67.
Turning now to Figures 4 and 5 ~ it will be understood
~' that during a coil insertion process, a cylinder 76 fastened to
..j
; 25 the machine frame is actuated so as to move the rod 77 thereof.
Fastened to the rod 77 is a driver that may be in t~e form of
a plate 78 interconnected with a plurality of wedge pushers 79.
.: ','' ~ . ,:
1 2
;- ' ' .
j,
,' I '
i
~5~79
`. The wedge pu~shers will move axially al.Qng guidcs such as guides
81 formed by guide plate 82 carried by the m~chine frame, ~nd
. move upwardly througll guide holes 80 in the base plate 52 (see -.. -
. Figure 2). In this m~nner, insulators , e.g., wedges may be
5 moved axially upwardly between selected adjacel-t ones of the
wedge guide~ durin~ a coil insertion process.
In order to ac~uate or drive the stripper, the rod 77
moves up~ardly so that an adjus~able driver, shown as a screw or
bolt 83, carried on the end thereof impinges a~ainst the bottom
.. . . .
of the stripper 69, along the recess 84. Then, with continued
a~tuation of th~ cylinder 76, the striPper 69 (see Figure 2~ is
-. advanced upwardlv with the driver 83, and windin~s (as well as
wedges, if desired~ are placed in the axially ex~ending slots -.
of a stator core. At the end of an injection cycle, the cylinder :`
~` 15 76 retracts so as to withdraw the actuator, i.e., rod 77, to an
' initial rest position. ~
~- llhen it is desired to change the set-up o~ the apparat~s . .
; ~ :
.. . .
10, the blades 22 w~tich are not carried by the stri.pper, and
thus movabl~, are repositioned ~xially relative to th~ machine
; ~ ,
frame. A preferred mode by which this may be a~conlplished involves
manually gripping the strippcr 69 (or using a suitable tool for .`
, that purpose) and withdrawing the stripper 6~) from the ~enter of
,; ~ the tooling package or assembly 87. Thereafter, a tool 5uch 2S
~, the tool 86 shown in Fi~ure 5 is inserted in the tooling to
25 engage the spantler nut 33; a~ thc spanner llut is ~urned at least
a partial turn ~o permit turnin~ of the blade adjusting nut 27,
i. .
,.` Thereafter, anc)ther tool, simil3r to the tool shown in Figure S
'~' '
~ ~ -13- ::
~ 9
which hai~ thrce fin~erx 88 disposed of a span to correspond
to the span of the notches 89 in the flang~ 90 of the blade
; adjusting nut ~7 ~see Figure l), is used to turn the blade
adjustin~ nut 27. The blade adjusting nut ~7 is turned in a
clockwise or counter-clockwise direction, depending upon whether
it is desired to raise or lower the blade holder 31. The blade
adjusting nut 27, by reason o its meshing inter-engagement wQth
the blade holder 31, moves the blade holder axi.ally upwardly or
downwardly relat}ve to thc blade ad~usting nut 27, ~leeve 24,
~; lO and the machine frame. The inter-fitting relation~hip of blades
22 and the wedge guides 19 prevent.s the as~embled blad~s 22
- and blade holder 31 from rotating with the blade adjusting nut
27, all as wqll now he understood by persons skilled in the art.
After the blades 22 have been adjusted to a desired
height to correspond to a preselected or predeter~ined stator ~ -
core axial length (or stack height), a tool (such as a wrench
or screwdriver) is inserted through the center of the ac~uator
.~ guide tube 51 so as to engage stripper travel ~ontrol member 83.
If the blade~ 2~ have been exten(led to correspond to a longer
core, an extra amount of stripper travel will he needed. In this
case, the stripper travel contro~ membee 83 is turned so that the
stripper will be moved sooner during the stroke o the cylinder
.~ 76. On the other hand, if the blades 22 have been retrac.ted
~ .
relative to the wedge guide housing 16, the member 83 will be
,"1 '
j;' 25 threaded more deeply into connecting rod 91 so that a ~reater
,'.:
.
:.- . .
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~051~79
~ portion of the s~roke o ~he ro(i 77 will elapse before the
.. member 83 screw ~ngag~s .~ctu~tor 84 and drives the ~tripper
.
; 6g relative along the bl~dc~s 22. ~fter these adjustments have
been made in the apparat~ls l() (in~lu~ g relocking the spanner
nut 33) the actuator rod 84 and stripper 69 are again disposed
in their operative position ~s illustrated in Figure 2.
. In more preferred arrc~ngements, which difrer in minor
`: respects from the illustrated emhodiment, it is not necessary to
.`` loosen spanner nut ~3 prior to adjusting the blade adjusting
-;. .
~ lO nut 27. In ~his preferred fo~n, the ~houlder 30 of sleeve 24 ~ --.;:
. is located at an elevation slightlv above the ele~ation of the . :,
top surface of ~lange 90 (as viewed in Figure 2). T~e washer
i~ 32 is then provided with an inner diameter or bore of a size
.~ such that it can be slipped oYer ~he threaded end of sleeve 24,
and rest against shoulder 30. The washer 32 then will be in
! :
spaced relation to ~l~nge 90; and adjusting nut 27 n~y subse-
~* quently be adjusted without loosening spanner nut 33.
<. When the just described more preferred arrangement
,i.~.. ;~ is utilized, the only time that it would be necessary to loosen
,; 20 (and remove) sp~nner nut 33 would be when it was desired to re-
. . .
~, move a given blade pack (i.e., blade holder 31 and blades 22
;,j . .
fastened thereto) and replace it ~th another, somewhat different
blade pack. This may b~ done, or example, so that a blade pack
specifically dimensioned an~ sized for a given wire size may be ~ ;
utilized when wire coils formed from such wqre are to be placed
.~'
in a slotted core :
';, . . .
~...... , :
" ~ . .
-15- :
,"
~ .
L051~7~
.: In ~ig~lre 6, I have illus~rated, with solid lines, a
stator core 67, of a first pre~etermincd stack he.ight, positioned
: on the blades 22 prior to injection of coil turns 63, 64 into
the slots of the core. I~ will he l1oted that the blades 22 are
positioned so that they extend slightly beyon~i the end face 92
of the stator core 67 after it has been positioned thereon. The
amount o~ such exten.sion is not critical, but I have found tha~
it is gener~lly de~,irable for the blades ~o project from 3/16
of an inch to l/4 of an inch beyond the upper f~ce 92 of the core.
Some amount o blade extension over or beyond the
stator core is desirable in order to assure that wire wi.1l not
be exposed to anv portion of the sta~or tooth or .slot edges
.... .
during a coil in~ertion process. Thus, the blade extensions
; actually will protect wire from the stator iron. Moreover,
1~ the blade extension or height, in conjunction with the
, stripper, will det ermine how ~ar wound coils will be pulled
;. through the core, all as will be understood by persons ski~led
in the art.
The dotted line representation o~ ~no~her core 93, .:
2`0 having a greater stclck height than that o~ the core 67 is also `~.
. revealed in Figure 6. Moreover. the blades ~2 ale ~ho~n by
: phantom lines 94, 96, in the position tllat they would assume
after a set-up adju*tment for.core~s hc~ving an axial leng~h :~
corresponding generally to th~t of the core 93. It wqll again
be noted tha~ the blades 22 are positioned to project trom 3116
. o an ineh to one quarter of an inch (about 6.3 mm~ bevond the
end faee 97 of the st~tor core 93,
"'~ :.'
-- ~os~7
In the abov~ referenc~d W~llker U. S. Pat, considerable
discus~sion i~ ~r~sented eonecrnin~ the ~le~sirat-ility of a~justin~ :~
.. blades so that different bl;ldes project ditlerellt .IXi~l lell~yths.. ~ . .
~ The arrangement that I have provided may provide such fe~tures,
,'.' ' ' .
particularly when the blades ~2 tsee Figure 1) are provided with . :~
- axially extending ~lots ra~her th~n round holes as illustrated
at 37. Once the blades 22 are positioned, by using such slots,
so that they extend different desired axial len~th~ relative to :~
the blade holder; the relative axial extensions of the blades will
.,i, .
! 10 be maintained by the screws 36 which thread into the blade holder
. 31 Thereafter, for a given stator core ~lot pattern, all of
. . the normally fixed hlades 22 may be substantially simultaneously
. adjusted by moving the blade holder 31 axially in the manner ~:
.~. described hereinabove Tlle arran~ement just described, wherein
.,! ~5 blades 22 are slotted, would be useable only when ~he b]ades are
h'. relatively large, since sufficient blade material must remain for
i, . . .
l adequate strength, and since ~he heads of screws 36 would of
~....................................................................... .. .
~ necessity be relatively small (and therefore relatively weak) ~
. .
when used to fasten small blades to a blade holder 31 Accordingly,
,
in the case of many blade packs~ variations in blade hei~hts for
~ a given blade pack may be provided by using b1~des of different
:: lengths. Since it has not previo-lsly been mentioned it is now
... .
~:: noted that the screws 21 are acco~nodated by counter bore~ holes
1~ in the ha~lsil~ 16, and arc thread~d into holes 20 in the
wedge guides.
-- It ~ill he appreciat~d tl)at, witîh the arrangements
illustrated h~reil~, there is substantially no danger th~t the
.' " ~ ' .
-17- ~:
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~ 51~79
individual blades 2~ rnay be move~ relativc ~ one ~nother in-
,` a~vertently. Moreover, all o~ the normallY fixed po.sition blades
may be quickly ancl easi.ly adju~ted ;lxially to cvrrespond,to co~es
'~' of different stack heights. Although the present invention has
,' 5 been illustrated and described in connection with specific ex-
: emplificati~ns illustrated herein, it will be understood by ;'
. persons skilled in the art that the invention, as well as bene-
- Eits derived there~rom, may be realized with coil injection
equipment other than th~t specificn`lly illustrated herein.
Therefore, while there has been sho~l and de~scribed
herein what ~t present are considered to be ~referre~ forms or ,
,I, the invention in accord.mce with the Patent Statutes, changes
m~ be made therein without actually departing from the ~rue ,',
, spiri~ and ~cope of the invention. Accordingly, I intend to
0, 15 cover in the followin~ claims ~11 such equivalent variations as ' ~`
fall within the invention. `~
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18
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