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Патент USA US2412354

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Dec. 10, 1946.
2,412,354
7 an PARKER
LOOK SHEDDING MEANS
5 Sheets-Sheet 1
Filed May 1, 1945
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Dec. 10, 1946.
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LOOll SHEDDING HEARS
Filed llay l, 1945’
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Dec. 10, 1946.
s. P. PARKER ’
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2,412,354
LOOM SHEDDING MEANS
Filed may 1, 1945
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5 Sheets-Sheet s
SAMUEL F.’
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Dec. 10, 1946.‘
s R PAR-KER‘ _
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2,412,354
LOOM SHEDDING MEANS
Filed Ilay 1, 1945
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5 Sheets-Sheet 4 -
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SAMucL I? F’A
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D80 10, 1946-
2,412,354
s/P. PARKER
1400M SHEDDING MEANS
5 Sheets-Sheet 5
Filed May 1 , 1945
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Patented Dec. 1.0, ‘1.946
‘2,412,354 '
‘UNITED STATES PATENT OFFICE
LOOM snsnnmo MEANS
Samuel 1?. Parker, 'La_Grange,vGa., assignor to
Callaway Mills, La Grange, Ga., a corporation
of Georgia
Application May 1, 1945, Serial No. 591,266 .
18 Claims.v '_(Cl. 139-55)
1
This invention relates to looms in which warp
yarns are manipulated by discs or cards to form
sheds in which ?lling yarn isinserted to produce
broken away, of lower portions of the newi'drive;
, Fig. 3 is a view'similar to Fig. 2, showing upper '
portions of the new drive;
_
v
Fig. 4 is a sectional view, the lower part- being
a fabric. More particularly, the invention is con
taken: on the line 4-4 of Fig. 2, and the upper cerned with a novel mechanism by which the
part on the line 40-41: of Fig.3;
discs of such a loom may be rotated in one direc
. Fig. 5 is a vertical sectional view, the lower
tion or the other under the control of a pattern
part being taken on the line 5-5 of Fig. 2, and ,
element. In a loom in which the new disc drive
the upper part on the line 50-50 of Fig. .3;
is employed, it is not necessary .to provide means
Fig. '6 is a vertical sectional view on the line
for twisting together the strands of warp yarn 10
6--3 of Fig. 2;
which are' to be handled by a single disc and
Fig. 'l is a sectional view on the line ‘1-1 of,
the warp yarns may, accordingly, be supplied to '
the discs from a beam or any ' other suitable
source.
'
.
In disc looms in which the discs continuously
rotate in one direction, the strands of warp yarn
handled by a single disc are twisted together by
the rotation of the disc, and the twist runs in
both directions from the disc. If measures were
Fig. 3;
a
Fig. 3 is a view in end elevation of a ratchet
wheel used in the new drive‘;
'
'
Fig.9 is a view in end elevation of a modi?ed
’ ‘drive;
Fig. 10 is a plan view of the construction
shown in Fig. 9; and I
_
Fig. 11 is a,view in rear elevation of the con
not taken to prevent, the twist running back from 20
struction shown in Fig. 9.
'
each disc to the supplies of warp yarns would
The loom illustrated in Fig. 1 comprises the
soon'make it impossible to draw the yarns fromv
the supplies. It has, accordingly, been proposed
usual sides 20, between which extends a crank
to reverse the direction of rotation of the discs
periodically so that the discs rotate one or more
shaft 2| operating a lay 22 provided with a reed '
steps in onedirection ‘and then rotate stepwise
usual way by conventional means, such as picker -
'in the reverse direction, the" reverse rotation of "
the discs taking out the twist imparted to the
groups of warp yarns handled by individual discs,
between the discs‘ and the warp yarn supplies, 30
The mechanism heretofore proposed for the pur
pose of driving the discs with a reversing action,
is impractical,.in that the discs are not under.
positive control at all timesv and part of their
movement results from momentum.
The new mechanism overcomes the objections
to the disc drive previously proposed and it in
cludes positive means' for rotating the discs in
one direction or the other. The disc rotating
means may include a shaft operatively connected
to the discs, and pawl and ratchet means for
moving the shaft stepwise in one direction or
the other under the control of means which are
23. A shuttle 24 is movable across the lay in the
sticks, etc., operated from cam shaft 25.
The
warp yarns 28 are drawnfrom any suitable source
of supply, such as beam 21, the arbor 2B of which
is-provided with a brake drum 28a acted on by a
brake band 29.- From the beam, the yarns travel
through‘ a device, generally designated 30, for
maintaining the yarns under tension, the device
preferably being that disclosed andlclaimed in
my co-pending application Serial No. 591,265,
filed May 1, 1945. From the tension control de
vice, the yarns pass around lease rods indicated
at 3|, and thence to discs 32. In the construc-.
tion shown, each disc has four openings for the
passage of individual yarns, and the discs are
formed with peripheral teeth (not shown) vmesh
ing with long pinions on upper and lower shafts
33, 34, respectively, which are supported in up
ward extensions 35 on the loom sides. The discs
in turn controlled by a pattern element; Means,
preferably taking the form of a shaft carrying 45 may be held in spaced relation by any suitable
means, such as those shown in my co-pending
cams, are provided for operating the pawl and
' ratchet means and for advancing the patern ele
application Serial No. 591,267, ?led May 1, 1945.
In the operation of the loom, the discs are
rotated stepwise through a quarter turn at each
drive shaft is provided with a brake which is
actuated by the cam shaft at the appropriate 60 step, and sheds are thereby formed, through
which shuttle 24 is passed to produce a fabric.
times to hold the disc drive shaft against. acci' v
The fabric is taken‘ up on a take-up roll 36 after
dental rotation.
.
having passed around other rolls, such as that
- For a better understanding of the invention,
indicated at 31.
,
reference may be made to the accompanying
The new drive forwthe discs comprises a shaft
drawings, in which
'
38 mounted in suitable bearings in the loom sides
Fig. 1 is a view in side elevation of a disc loom
and provided with a sprocket wheel 39, about
equipped-with the new disc drive, parts of the
which is traineda chain 40 similarly trained about
loom being broken away to show the features of
a sprocket wheel on shaft 34. Shafts 33 and 34
the drive;
are connected by a chain- 4i trained about
Fig. 2 is a view in rear elevation, with parts
ment, ‘and in the preferred construction, the-disc
2,413,354
.
‘
I
3
'
4‘
I
sprocket wheels thereon, so that the shafts wi
rotate in unison“. Shaft 38 is provided with a
pair of ratchet wheels 42, 43 fast thereon and
‘oppositely disposed, that is, having their 'teeth
extending in opposite ‘directions. A yoke 44
straddles shaft 38 and is pivotally supported at
45 on an arm 46 pivoted at 41 on an upright frame
'
cam 18 on shaft 26, the cam ‘engaging a'rolle'r 88
mounted on a stud on arm 46.
,
.
'
.
In order to prevent overrunning of shaft 38, it
is provided with-a brake'drum 8| having a pe
ripheral channel in‘ which is seated a brake
band consisting of a strap>82 carrying a length
of brake lining 83 on its inner face. The strap
member 48 attached to a part of the loom frame;
is connected at one end to a pin'84 on an arm
work. The yoke is provided with pawls for oper
65, pivotally mounted at 86 on a bracket 8'l_
ating the ratchet wheels and, in the construction 10 secured to the loom frame. The other end of the
shown, the‘pawlstake the form of pins 49, 56
strap is connected to a bolt 88, which passes.
engageable with the teeth -of ratchet wheels
through openings in arm ,85 andfcarries'a wing
42, 43, respectively, depending on the position
nut 89, beneath which is a spring 98 encircling
of yoke 44. A spring 5| connected to the tail
_ the bolt and bearing at one end against the wing
of the yoke and to frame member 48 tendsvto 15 nut and at the other end against arm 85. Arm.85
is raised and lowered during the operation of
swing the yoke counterclockwise on its pivot 45 to
bring pin 49 into operative relation to the teeth
the loom by a double acting cam 9| on shaft 25.
When a low part of the cam is in contact with
of ratchet 42. The yoke is movable to the oppo
- arm 85, the strap 82 bears lightly against the
site position, as' shown in Fig. 4, by means con
trolled by a pattern device.
20 drum' 8|, so that shaft 38 can be moved against
the action of the brake. When a high point on
The pattern device includes a pattern element
52 in the form of a chain carrying riders 53
cam 91 bears against the arm and swings it
upwardly, strap‘82 bears so tightly against drum
mountedin a selected arrangement on the links
thereof, and the chain runs over a sprocket - 8| as toprevent rotation of shaft 38.
'wheel 54 on a shaft 55 supported in bearings in 25
In the operation of the apparatus so far de
arms 56 attached to the arch 51- of the loom.
scribed, the rotation of cam shaftv25 causes yoke
44 to be raised and lowered twice per revolution '
A ratchet wheel 58 fast on shaft 55, is actuated
. by pawl 59 carried by an arm 60 loosely mounted
of the shaft. In each upward movement of the
yoke, one or the other of pins 48, 50 engages
on shaft 55 and connected by a rod 6| to an
arm 62'pivoted at 63 on a ‘bracket 64 attached 30 its respective ratchet wheel 42, 43 and rotates
to the loom frame. Arm 62 is swung up and down
the wheel and shaft 38 by one tooth.’ During‘
by a cam 65 on the loom cam shaft 25, and
such, movements of shaft 38, arm 85 is in the
each time the arm is raised, pawl 59 engages
down position so that the brake band 82 bears
lightly against‘ drum .8l and permits the. shaft
ratchet wheel 58 by one tooth and advances
- shaft 55 by' one step. Shaft 55 carries a disc 66
to be rotated. vIn the end of each step in the _
fast thereon, the disc having peripheral depres
movement of shaft 38,‘arm 85 is raised to apply‘
‘ the brake and prevent anyoverrunning of shaft
sions 65a which may be entered-by a disc 61
carried by an arm 68v pivotally mounted on a rod
38. Once\ per revolution of shaft 25, ‘arm 62 is
operated to advance ratchet wheel 58 by one'
56a- extending between arms-56. The free end
of arm 68 is connected by a spring 69. to, one end 40 tooth. This causes shaft 55 and sprocket wheel
of a rod 10 mounted for swinging movement on
54 to be rotated a step and pattern chain, 52 to be
.advanced a step.
shaft 55 and having a rearward extension over
Arm ‘H overhangs pattern chain 52, and when
lying rod 56a. ,With this arrangement, arm 10
acts as a stop for one end of spring 68', and, as
ever a rider 53 on the chain engages arm ‘II, the
shaft 55 is advanced a step by rotation of ratchet
arm is maintained in the raised position shown
wheel 58, disc 61 is forced upwardly out of a
in Fig. 4 and operates through the connections
depressionin the periphery of disc‘ 66 against the
described to keep the lower end of yoke 44 to the‘
action of spring 69. Disc 61 then entershthe
left, as shown in Fig. 4. With the yoke in this
next depression in disc '66 and this serves to hold
position, the raising of arm 46 by cam 19 causes .
pin50 to engage a tooth of its ratchet wheel and
_ shaft 55 against further movement until ratchet i
wheel 58 is advanced another step.
,
_
advance the wheel by one tooth for each rais- ,
The pattern element 52 controls the position
ing of arm 46. This causes'shaft 38 to be ad- '
of yoke 44 by means of an arm 1| pivotally
mounted on rod 56a. Arm 1| overlies the pat
vanc-ed counterclockwise by one step, and 'the
tern element and is engageable by the riders 53
thereon, whenever a rider lies at the top of
sprocket wheel54 (Fig. 4). The free end 12 of
arm ‘H is offset from the remainder-of the arm
‘and is connected by- a rod ‘[3 to a crank arm 14
one step. Rotation of shaft 34 causes shaft 33
to rotate, and the pinions on the shaft cause discs
32 to move-one step in a clockwise direction, asv
fast on a shaft 15 mounted in a bracket on one
shaft acts through chain 48 to rotate shaft 34 ‘
viewed inFig. 1. Whenever a portion of chain
52, not provided with a rider, comes beneath arm .
‘H, the arm swings down, and this permits spring
of the loom sides, and shaft ‘[515 provided with
5! tov act on the- tail of yoke 44 and swing the
another arm 16 connected by a link-‘I1 and a'stiif
yoke, 50 that pin 49 moves into operative relation
spring 18 to one leg of yoke 44. With this ar
with its ratchet wheel 42. On the next upward
rangement, when a rider 53 on chain 52 lies
movement of arm 46, ratchet wheel 42 is ad
beneath arm 1 |,.the arm is raised, and this causes 65‘ vanced one step, and this causes shaft 38 to'inove
shaft 15 to be swung clockwise. _ Arm ‘[6 then ' . clockwise by one step anddiscs 32 are moved
acts throughv link 11 and- spring '18 to pull the '
' lower end of yoke 44 to the left, as shown in Fig. 4.
counterclockwise.‘
The ,brake acting on shaft 38 and consisting
In this position of the yoke, pin‘ 56 lies in operas
' of brake drum 8|, strap .82, and arm 85, is, re
tive relation to the teeth of ‘its ratchet wheel 43, 70 leased just prior to each upward movement of
and upon raising of the yoke by arm 46, the
arm 46 and yoke‘ 44. At the end of each step i
, pin acts on the ratchet wheel to rotate the wheel
in the movement of shaft 38,‘ the brake is again
and shaft 38 by one tooth on the wheel. Arm 46
is regularly raised and lowered during the opera
andheld against accidental rotation, until the
tion of the loom by ‘means of a double acting‘
next action of arm 46 and yoke 44.
applied thereto, so that the shaft is‘ arrested
amasse
‘
-: 5
in the modi?ed construction shown in Figs.
9, 10, ‘and 11, the crankshaft 2!‘ of the loom
to ‘the discs for rotating them stepwise in either
direction, said means including a shaft' a ml!‘
of oppositely disposed ratchet wheels on the shaft,
carries a- gear 92 meshing with gear 93.011 a shaft
96. Shaft 94 is provided with a disc Sta carry
ing an eccentric pin to which is connected rod .
and a reciprocating member carrying a pair of ‘
Pawls engagealole selectively with respective ratch_
et wheels, means for continuously reciprocating
to, which reciprocates a rod 95 mounted in a -
guide 97.
Rod 95 is attached at vone end to a
said member, control means for controlling the
action of the rotating means, and a pattern de
yoke as, in which are pivotally mounted pawls
$9, each of whichis provided with a pin loll lying
vice for controlling the control means.
within a slot- WI in a bar I02. The bar is con
_
'
)2. In a loom, the combination of a plurality of
nected by a cord M3 to the harness lever “it of
a dobby head, the position of the lever being
controlled by a chain Hi5 trained about a sprock
warp‘shedding discs,‘ a shaft operatively con
nected to the discs for rotating them, oppositely
lie‘ provided with a sprocket wheel Hi, about
'lected pawl effective and the other ineffective,
and a pattern device for controlling the control
_ disposed ratchet wheels on the shaft, a pair of
et wheel. ass on a shaft It? and carrying riders
pawls engageable selectively with respective
888 in a selectedv arrangement. Pawls 9d operate 15 ratchet wheels, means forreciprocating the pawls
on respective ratchet wheels I119, I091: on a shaft
in unison, control means acting to render a se=
which is trained a chain “2. The chain passes
about a sprocket wheel M3 on a shaft 341’, which
corresponds to shaft 3d in the Fig. l construc
tion, and is provided witha long pinion (not
shown), the teeth of which mesh with the teeth
of the discs to be driven.
rl‘he construction shown in Figs. 9, 1c, and ii
operates as follows: 0n each revolution of shaft"
rod as is reciprocated and moves yoke as back
forth. Both pawls es move with the yoke,
and one or the other oi‘ the pawls engages its
respective ratchet wheel use, ldiia, depending on
‘the position of bar use. When a rider on chain
tllii iies beneath the harness lever tilt, the lever
raised and this raises bar Hi2. In such upward
movement of bar m2‘, the lower end of the upper
slot tilt engages pin lilii on the upper pawl iii:
raises the pawl free of ratchet wheel ltd,
this movement of the pawl being resisted by
spring M43 connecting the pawl to the bar. At
the same time, lower pawl
is raised by its
spring lid connecting the pawl to bar m2, and
means.
hit
i
3. in loom, the combination of aplurality of
warp, shedding discs, means operativelv con=
necmd to the discs for rotating them in either
direction, control means operative only for con
trolling-the operation oi‘ the rotating means, a
pattern device'for controlling the control means,
and a drive shaft for operating Tooth the rotat=
ing means and the pattern devicel
v
4. In a loom, the "combination
a plurality of
warp shedd
discs, means operatively (1021
nected to the discs for rotating them in either
direction, control means operative only
con",
trolling the operation of the ‘rotating means, a
‘pattern device for controlling the control means,
and means including a shaft and earns thereon
for operating both the rotating means and the
‘ pattern device,
5. In a loom, the combination of a 30
‘warp shedding discs, means 0 opera
‘nected to the discs for rotating them
pwise in
the end of the pawl moves into operative rela dd either direction, control means 0
ive only
tion with the teeth on ratchet wheel Edda. On
for controlling the operation of the rotating
the next movement of rod es and yoke as to the
means, a pattern device for control
con»
left, pawl 9%} causes its ratchet wheel to be ad
trol means, means acting on the rotati 2; means
vanced by one tooth, and this causes clockwise
to arrest the rotation of the discs at the end of
rotation of shafts toil and 34' and counterclock as each step in their movement, and a drive shaft
wise movement of the discs driven by shaft 365'.
for operating the rotating means and the pattern
Shaft it? is advanced stepwise by appropriate
device.
‘
means, as, for example, a ratchet wheel on the
6. In a loom, the combination of a plurality
shaft, similar to ratchet wheel 58, a pawl for .
oi‘ warp shedding discs, means operatively con‘
moving the ratchet wheel, and cam means for fad nected to the discs for rotating them stepwise in
actuating the pawl. ,So long as a, rider m8 on
the chain lies beneath lever MM at each period
of rest of the chain, bar Hi2 will remain elevated,
and lower pawl 9d will be 'e?ective. Whenever
either direction, control means operative only for
controlling the operation of the rotating means,
a pattern device for controlling the control means,
means'acting on the rotating means to arrest the
a chain link not provided with a rider comes a rotation of the discs at the end of each step in
‘ their movement, and means including a shaft and
beneath lever HM, bar N32 is allowed to move
down, and this causes upper pawl 99 to become
effective and the lower pawl to become ineffective.
cams thereon for‘ operating the rotating means
and the pattern device.
The discs are thus rotated stepwise in one direc- ,
7. In a loom, the combination of a plurality of
tion or the other by rotation of shaft 36', the so warp shedding discs, means operatively con
direction of rotation of which is determined by
nected to the discs for rotating'them ‘stepwise in‘
the patternchain.
'
either direction, said means including a pair of
The loom illustrated and described is provided
ratchet wheels and pawl means selectively oper
with discs having four openings therethrough, so
able on one or the other of the ratchet wheels,
that each disc handles four warp yarns, or a 65 control means operative only for controlling the
multiple of four yarns. It is to be understood
action of the pawl means, a pattern device for
that the discs may have a number of openings
controlling the control means, and a drive shaft
other than four, if desired, or the discs shown
for operating both the rotating means and the
may be operated to control only two yarns.
pattern device.
_
This application is a continuation-in-part of 70 8. In a loom, the combination of a plurality of
my application Serial No. 551,830, ?led August»
warp shedding discs, means operatively con
nectcd to the discs for rotating them stepwise in
either direction, said means including a pair of
1. In a loom, the combination of a plurality of
ratchet wheels and pawl means selectively oper
warp shedding discs, means operatively connected 75 able on one or the other of the ratchet wheels,
30, 1944.
The claims are:
.
~
'
aeraase
control means operative only for controlling the
action ‘of the pawl means, a pattern device for
controlling the control means, and means includ
ing a shaft and cams thereon for operating both
the rotating means and the pattern device.
9. In a loom, the combination of a plurality
of warp shedding discs, means operatively con
nected to the discs for rotating them stepwise in
either direction, said means including a pair of
ratchet wheels andreciprocating-pawl means se
a
vice including a pattern element for controlling
the action of the control. means, and means for
operating the rotating means and advancing the
pattern element stepwise, said means releasing
the brake means at the beginning of each opera
tion of vthe rotating means.
15. In a loom, the combination of a plurality
" of warp shedding discs, a shaft operatively con
nected to the discs‘ torotate them, a pair of
10 ratchet wheels oppositely disposed on» the shaft,
means including pawls selectively engageable
with respective ratchet wheels to rotate the shaft
stepwise in opposite directions, brake means oper
lectively operable on one or the other of the
ratchet wheels, control means operative only for
controlling the action of the pawl means, a pat
able on the shaft, to arrest its movement. at the ,
, tern device for controlling the control means,
vand a drive shaft for operating both the rotat 15 end of each step, control means for controlling
the action of the rotating means, a pattern de
ing means and the pattern device.
vice including a, pattern element for controlling
10. In a loom, the combination of a plurality
of warp shedding discs, means operatively con
nected to the discs for rotating them stepwise
the action of I the control-means, and a shaft
' provided with cams for operating the rotating
in either direction, said means including a shaft, 20 means,ladvancing the pattern element stepwise,
and releasing the brake means at the beginning
a pair of oppositely disposed ratchetwheels on
the shaft, and a reciprocating member carrying
of each operation of the rotating means.
pawls engageable selectively with respective ratch
,
16. In a loom,_'the combination of a plurality
of warp shedding discs, a shaft operatively con- '
et wheels, means for continuously reciprocating
said member, control means for controlling the
operation of the reciprocating member to se
‘nected to the discs to rotate them, a pair of
ratchet wheels oppositely disposed on the shaft,
a yoke carrying a pair of pawls engageable with
lect the pawl which will engage its ratchet wheel,
and a pattern device for controlling the control ' , respective ratchet-wheels, an arm movably sup
‘porting the yoke, means connected to the yoke
means.
11‘. In a loom, the combination of a plurality 30 for shifting it relative to the arm for bringing a
of shedding discs, a shaft connected to the discs ‘ selected pawl into operative relation to its ratch
to rotate them, a pair of ratchet wheels oppositely
disposed on the shaft, a yoke, a pair of pawls care
et wheel, a pattern element, means controlled by
the element for controlling the ‘yoke shifting
ried‘by the yoke and engageable selectively with
means, and a shaft having cams for advancing
respective ratchet wheels, means for moving the
yoke between .two positions to bring a selected
, pawl into operative relation to its ratchet wheel,
_
means for reciprocating the yoke, pattern means
for controlling the operation of the yoke moving.
means, and means for operating the yoke mov 40
ing means and the pattern means.
12. In a loom, the combination of a plurality
of warp shedding discs, means operatively con
nected to the discs for rotating them-stepwise
in either direction, control means for controlling
the operation of the rotating means, a pattern
device for controlling the control means, means
the pattern element stepwise and for moving the
arm and the yoke thereon to cause the selected
pawl to'engage its ratchet wheel and advance the
first shaft by one step.
»
1'7. In a loom,v the combination of a plurality
of warp shedding discs, a shaft operatively con
nected to the discs to rotate them, a pair of
ratchet wheels oppositely disposed on the shaft,
a yoke carrying a. pair of pawls engageable with
respective ratchet wheels, an arm movably sup
‘porting the yoke, means connectedto the yoke
for shifting it relative to the arm for bringing
a selected pawl into operative relationv to its
acting on the rotating means to arrest the rota
tion of the discs at the end of each step in their
ratchet wheel, a pattern element, means con
movement, and a drive shaft for operating the '
shifting means, a brake drum on the shaft, an
arm carrying an element engageable with the
brake drum to stop rotation of the shaft, and a
rotating means, the pattern device, and the ar
resting means.
'
I
'
trolled by the element for controlling the yoke
13. In a loom, the combination of a plurality
of warp shedding discs, means operatively con
cam shaft having cams for advancing the pat
tern element stepwise, for moving the yoke sup
nected to the discs for rotating them stepwise in
either direction, control means for controlling
the operation of the rotating means, a pattern
device for controlling the control means, means
porting arm to cause the selected pawl to engage
its ratchet wheel and advance the'?rst shaft by
acting on the rotating means to arrest the rota
tion of the discs at the end of each step in their
movement, and means including a shaft and
, cams thereon for operating the rotating means,
the pattern device, and the arresting means.
14. In a loom, the combination of a plurality
of warp shedding discs, a shaft operatively con 65
nected to the discs to rotate them, a pair of
ratchet wheels oppositely disposed- on the shaft,
means including pawls selectively engageable with
respective ratchet wheels to rotate the shaft
stepwise in opposite directions, brake means oper 70
able on the shaft to arrest its movement at the,
end of each step, control means for controlling
the action of the rotating means, a pattern de
‘ one step, and for swinging the second arm to free
the element thereon from the brake drum.
18. In a loom, the combination of a plurality
of warp shedding discs, a shaft connected to the '
discs, means for advancing the shaft stepwise
in opposite directions, said means including
ratchet means on the shaft, a reciprocable mem- _
ber, a pair of pawl elements carried by the mem
ber and alternately. engageable with the ratchet
means, means for reciprocating the member, the
pawl elements moving in unison and in the same
direction with it, control means for controlling
the action of the pawl elements on the ratchet
means, and a pattern° device for controlling the
control means.
.
_
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SAMUEL P. PARKER.
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