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Патент USA US2133688

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Oct. 18, 1938.
'
2,133,688
F. ECK
RACKING MECHANTSM F‘OR KNT'F’FTNG MACHINES
Filed March 31, 1956
3 Sheets-Sheet l
‘
INVENTOR
FR?/Vk ECK
ATTORNEYS
Oct. 18, 1938.
F_ ECK
2,133,688
RACKING MECHANISM FOR KNITTING MACHINES
Filed March 51, 1936
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3 Sheets-Sheet 2
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ATTORNEY$
Oct. 18, 1938.
F, EcK
2,133,688
RACKING MECHANISM FOR KNITTING MACHINES
Filed March 51, 1936
3 Sh€€t$~$h8€t 5
BY
)8
‘
ow‘, OlATTOR N EYS
Patented Oct. 18, 1938
2,133,688
UNITED STATES PATENT OFFICE
2,133,688
BACKING MECHANISM FOR KNITTING
MACHINES
Frank Eck, New York, N. Y.
Application March 31, 1936, Serial No. 71,821
12 Claims. (Cl. 66-69)
This invention relates to racking mechanism tions are obtained than the number of links of
and machine opening mechanism for knitting ma
diiferent height on the endless chain.
chines which, in the production of certain designs,
The invention also seeks, in another aspect, to
are racked.
adjust the eccentric. To this end, the functions
5
Certain types of knitting machines have two of two eccentrics are combined with a sliding rack
needle boards which are located relatively close control mechanism.
As already pointed out, on machines with flat
to each other. These needle boards have grooves
in which are disposed the knitting needles. Under needle boards, the needles are shifted from one
the control of certain mechanisms, the needles are needle board to the other during the knitting op
10 moved back and forth on machines with inclined
needle boards, and from one needle board to the
other on machines with ?at needle boards.
In knitting many fabrics, the design calls for
what is known in the art as the “rack stitch”.
15 The rack stitch is produced by shifting the needle
boards longitudinally with respect to each other.
This is termed “racking”. Depending on the de
sign, the racking may take place over any number
of needles. That is, the board that is shifted is
20 moved over a desired distance (i. e. number of
needles), and in the type with ?at needle boards,
must be stopped in an exact position so that the
grooves from one needle board are exactly in line
with the grooves of the other needle board.
In the prior art, this shifting and stopping is
produced by impounding members on stepped
arms which are shifted in an opposite direction
by a gear, or the shifting is done directly by a
gear. A gear, however, requires a certain amount
of clearance which becomes greater with use due
to wear.
In some instances, the shifting of the
needle boards is produced by eccentrics, which
eliminate all clearance. However, the amount of
shifting by eccentrics is limited to two or four
needles.
Objects of this invention are to combine the
advantages of eccentrics with a selective racking
mechanism, so that the machine may be racked,
by eccentrics, over twelve needles or more, if de
4-0 sired; over any desired number of needles at a
time; to start and stop the needle boards at any
desired and exact position and rack the needle
boards in either direction.
eration. By means of certain adjustments on the 10
needle shifting mechanism, some of the needles
on one needle board may be shifted to the other
needle board while the rest of the needles remain
on the first mentioned needle board. Thus there
are needles on each board. The rack stitch is pro
15
duced by shifting one of the needle boards longi
tudinally with respect to the other when there
are needles on both boards.
As the needles ex
tend beyond the edge of the needle boards, the
needles may interlock with each other during
racking and thus be damaged. To avoid this, it
is advantageous to move the needle board further
apart during this operation. This lateral shift
ing of the boards is termed “opening the ma
chine”. Although a greater opening offers less 25
chance for the needles to interlock, which is to
be avoided, nevertheless, the further apart the
needle boards are moved, the further the fabric
must be pulled by the needles. As the tightness
of the knit of the knitted fabric differs from place
to place therein, if the fabric is tight and the ma
chine is opened too far, some of the needles may
be pulled back by the fabric and thus be in a posi
tion to interlock with needles on the other board.
Therefore, for the best operation, a compromise is 35
sought, in which the machine is opened enough
for the needles but not too much for the fabric.
In the prior art, the amount of opening is con
sistent regardless of the tightness of the fabric.
A further object of this invention is, therefore, to 40
open the machine a selective distance depending
on the tightness of the fabric. To this end, easily
adjustable means are provided to open the ma
Heretofore, on power driven machines, the > chine.
These and other objects of the invention and 45
amount of shift of the needle boards is controlled
the
means for their attainment will be more ap
by an endless chain carried on a sprocket Wheel
parent from the following detailed description
which in turn is controlled by a timing mech
taken in connection with the accompanying draw
anism. The control is effected by the use of links ings illustrating one embodiment by which the in
of different heights whereby the boards are shifted vention may be realized and in which:
different distances during one operation. Thus,
Figure 1 is a View in perspective showing so
as many different shiftings of the needle board much of a knitting machine as is necessary to il
can be obtained as there are links of different
heights on the endless chain.
55
According to this
invention, also, a greater number of racking posi
lustrate the racking and machine opening, posi
tion setting and position controlling devices of
this invention;
55
2
2,133,688
Figure 2 is an exploded view, in perspective,
showing the four parts forming the adjustable ec
link comes under roller I0. Roller I4 is mounted
centric of Figure 1;
member I6, I6’ pivoted on a pin I1 extending
Figure 3 is a fragmentary sectional view, taken
in the plane indicated by the line 3--3 of Figure 1,
looking in the direction of the arrows and showing
the position assuring device;
Figure 4 is a view, in perspective, showing
mechanism for setting the racking and machine
through blocks I8 disposed on opposite sides of a
block 20 slidable in the guides 1' on bracket 1.
The pin I1 also passes through and is guided in a
slot IS in the block 20. Block I8 retards pin l1
from vertical movement and block 20 from longi
tudinal movement and both blocks I8 and block
opening mechanisms into neutral position and
also the machine opening devices at both ends of
20 prevent the pin and bell crank I6, I6’ from
lateral movement. Thus pivot I1 rotates in its
the machine and their interconnections;
original position so that the roller 2| on the de
pending arm I6’ is moved to the right an amount
proportional to the lengths of the two arms of
member I6, I6’.
The roller 2I, being disposed in a housing 22 on
a reciprocating rod 23, a movement to the right
of roller 2'! forces the housing 22 and rod 23 to
the right also. The rod 23 carries a bearing 24
for a shaft 25 rotatably mounted therein. Thus 20
a movement to the right of bearing 24 carries rod
'25 to the right also and also carries with it pivot
pin 26 connecting the upper end of shaft 25 with
a rotatable disc 21. The disc 21 is disposed in a
_
Figure 5 is a sectional view, taken on the line
5—5 of Figure 1;
15
on the horizontal arm I 6 of the bell-crank-like
Figure 6 is a plan view of the knitting machine
of this invention looking from above and showing
the relation of the different parts;
Figure '1 is a view in front elevation, of the
knitting machine of this invention showing the
20 relation of the different parts;
Figure 8 is a front view showing the controlling
block and illustrates the different positions which
the controlling pin assumes when this block is
shifted vertically; and
Figure 9 is a diagrammatic view showing the
25
different positions which the rollers assume in set
ting the racking mechanism into different posi
tions.
Referring first to Figure 1, the needle board 4|
30 is the relatively stationary needle board and the
needle board 40 is shifted with respect thereto
whereby selected needles may be transferred from
the needle grooves of one board to the other as
desired. Needle board 40 is shifted or recipro
35 cated by a racking member 13, 34 suitably sup
ported for reciprocation by a bracket 34’ extending
upwardly from a bed plate or base B of the ap
paratus.
The racking member 13, 34 is recipro
cated axially through the instrumentality of ec
40 centric means 25, 28, 32, 33 actuated from timing
mechanism, not shown because forming no part
of this invention, but causing the periodic recipro
cation of pull rods 8 and 39. The rod 6 carries the
pawl 9 which periodically turns the ratchet 5 on a
slide 28 adapted to reciprocate in the guideways
3|. Pivot pin 26 vcan only move longitudinally in
the same horizontal line. Therefore, disc 21 ro
tates in the block 28 and due to the changed po
sition of pivot 26 with respect to the center of
disc 21, block 28 slides downwardly. A pin 29 30
on shaft 25 slides in an arcuate groove 30 in the
block 28 and is always vertically under the pin
26. Therefore, both pins 29 and 26 have the
same eccentricity with respect to the center of
disc 21. The groove 30 is so constructed that 35
pin 29 can slide in ‘it laterally while block 28 slides
vertically. Disc 21 is preferably, but not neces
sarily, mounted on ball bearings within block 26.
The frame 3|, in which block 28 is slidable, is
fixed to a circular disc or roller 32. Disc 32 in 40
an aperture 32' is housed in a rectangular block
33 which is preferably horizontally slidable in
contact with the needle board shifting member 34,
say, by being disposed in transverse guideways
45
shaft 6 carrying sprockets I and 2. The rod 39
carries the pawl 39’ which periodically turns the
thereof.
ratchet 31 on the shaft 38.
On the sprocket wheels I and 2 are mounted
gear 35 which is driven by bevel gear 36 which,
with the ratchet wheel 31, are ?xed to shaft 38,
endless chains 3 and 4.
the ratchet wheel 31 being turned by pull arm
39 which is driven by a. timing mechanism, not 50
shown.
When pull arm 39 rotates ratchet wheel 31, by
These endless chains
50 usually comprise links of different heights which
effect control of the mechanism. Sprocket wheels
I and 2 and ratchet wheel 5 are ?xed on the axle
'6, this axle being rotatably mounted in frame ‘I.
When driving arm 8 for ratchet wheel 5, con
55 trolled by a timing device, is moved backward,
(to the right as viewed) hook 9 engages ratchet
wheel 5 and rotates it through an angular
distance equal to one tooth on the wheel 5. The
distances of the teeth on wheel 5 are so selected as
60 to be equal to the length of one link on the end
less chains. Thus, when wheel 5 is rotated by
one stroke of arm 8, the sprocket wheels I and 2
rotate just enough to bring the next link under
rollers I 0, and II. Roller I0 is mounted on the
end of a plunger I2 slidable in a guide I2’ shown
carried with bracket 1.
If a link on chain 3, which is higher than the
link then under roller Ill,_c0mes under roller I0,
this roller, its supporting plunger I2 and the
plate I3, ?xed to plunger I2, are elevated through
a distance equal to the difference in height of the
two adjacent links on chain 3. On plate I3 rests
a roller I4 which is held tightly on plate I3 by a
spring I 5, so that roller I4 is raised or lowered the
75 same amount as plate I3 each time a successive
On the lower end of shaft 25 is ?xed a bevel
making one stroke, gear 36 is rotated the same
amount. Gears 35 and 36 are so proportioned
that the amount of rotation of gear 36, due to
one stroke, rotates gear 35 through one-half revo
lution. This action also rotates disc 21 and thus
disc 32 through one-half revolution. Assuming
that, before such rotation, pivot pin 26 was ec
centrically disposed with respect to disc 21, discs
21 and 32 rotate in a vertical line with pivot 26
as a center, and thus after one-half revolution,
the centers of these discs, which are always in
the same vertical line, are brought to the other.
side of pivot 26 and thus disc 32 is actually moved 65
longitudinally. Since the disc 32 is operatlvely
connected with member 13 through block 33,
member 13 is moved longitudinally by rotation
of disc 32 about its offset axis. Member 13 is
connected to needle board 40, thus the needle 0
board is also shifted, which performs the racking
operation. During this operation, needle board
4| is stationary and, therefore, different grooves
42 are brought into register.
Thus there has been described the operation
3
2,133,688
of the invention from the controlling chain 3 to
duces the racking operation by rotating ratchet
the needle boards.
The operation for obtaining a desired distance
(number of needles) in racking will now be de
scribed.
If the parts of the mechanism are proportioned
wheel 31, is ?xed to an arm 51 to which is ?xed
an arm 58. Arm 58 has a raised part 59, which
so that the difference of height between two con
secutive links on chain 3 sets pivot 26 to an ec
centricity of one-half needle distance, after one
10 half revolution, the needle board is racked over
one needle distance. If the difference of height
between the two links is twice as much, pivot 26
comes in contact with roller 60 on a bell crank
6|, 6|’, ?xed on rock shaft 62, When arm 58 is
pulled to the right. This elevated part 59 is too
high to slide under roller 60. Therefore, the
roller 60 is moved to the right and thereby the
arm BI is swung in a counter-clockwise direction,
as viewed. The arm 6|’ has a bearing end 61a 10
which, during this movement, pushes a block 63
upwardly. The block 63 is slidable in guideways
is set to an eccentricity of two half needles and
63' and is formed with a slot or groove 65.
the machine is racked over two needles. There
64 on a bifurcated link 66 slides in the vertical,
diagonal, vertical groove 65 and thereby comes
15 fore, as many times a half needle eccentricity
can be produced as there are links of different
height on chain 3. Thus, if it is desired to rack
the machine over twelve needles in one direction,
twelve links of different height are required and
20 twelve links to rack the machine in the opposite
direction, that is twenty-four links of different
height are required. As it is possible, but, in
most situations is found to be impractical, to use
twenty-four links of different height, a second
chain 4 is provided to act in conjunction with
chain 3.
If, on chain 3, the highest link is under the
roller 10, bell crank l6, l6’ and rollers l4 and
2| assume a certain position, as shown in Fig
30 ure 1. Roller 14 is at the position indicated at
43, (Figure 9) while roller 2! is at the position
indicated at 44 and pivot 11 at the position in
dicated at 45. Assuming that, on chain 4, a
higher link comes under the roller H and on
chain 3 the lowest link, which follows the high
est link comes, at the same time, under roller
10, plunger 41 having roller 48 at its upper end,
is moved upwardly (Figure 1). Roller 49 pushes
arm 49, pivoted on the guide l2’, and with it
roller 50, at its end, upwardly. Roller 59 is in
contact with block 20 in which is the slot l9,
best shown in Figure 8. When block 20 is thus
moved upwardly, pivot l1 slides in slot i9 and
assumes the position indicated at 53, Figures 8
45 and 9, while roller [4 moves from position 43,
Figure 9, to position 54 and roller 2| remains at
position 44, Figure 9. Thus with pivot I ‘I at po
sition 53, rollers l4 and 2! can assume as many
different positions as there are links of differ
50 ent heights on chain 3. Thus by using on chain
4, four links, for instance, of different height,
pivot I‘! can assume the four different positions
45, 53, 55 and 56, Figure 9, and if there are six
links of different height on chain 3, rollers l4
55 and 2| assume six different positions for every
position of roller 2!. Therefore, four times six
or twenty-four positions can be assumed by pivot
I1. Due to these twenty-four positions, the ma
chine is racked over twelve needles with only ten
60 links of different heights, four on one chain,
say chain 4, and six on the other chain, say chain
3, that is, over a greater number of needles than
the number of links of different heights used.
When the links in operative position under
65 rollers l0 and I! are such that a lower link on
chain 3 follows the preceding relatively higher
link, roller I0 is caused to follow the links on the
chain by spring l5 pulling arm l6 downwardly
and racking the machine in the opposite direc
tion. The operation in opening the machine a
selective distance will now be described.
The opening of the machine is simultaneous
Pin
from the vertical groove through the diagonal
groove to the other vertical groove 65, whereby
pin 64 and link 66 are moved to the left, as
viewed. Link 66 is adjustably pinned to a forked
member 61, by a pin 88. The forked member 61
is pivotally connected at pivot '10 to a block 69.
Forked arm 67 is pivotally connected to standard
‘H, as at 12. Block 69 is formed with teeth ‘12'
on one face, which teeth 72 engage in similar
teeth 13' on member '!3 which is ?xed to the 25
shiftable needle board 46.
There is one member 13 at each end of the
needle board 49 together with a counterpart of
the block 63 and link 65 and associated mecha
nism, the block 63 at the other end being moved 30
by an arm 61’, ?la on the rock shaft 62 which is
the equivalent of the members bearing the same
reference characters on the bell crank 6!. When
link 66 and forks 61 are pushed to the left, as
viewed, block 69 ?rst disengages from the teeth 35
13’ of racking member 13 and on further move
ment comes in contact with the other face 13a
of the member 13, and pushes it backward, which
serves to open the machine, that is, separate the
needle boards. The machine is then racked. 40
By the time the racking operation is completed,
elevated part 59 on arm 58 is moved such dis
tance as not to be under roller 60 on the open
ing bal crank 5!, 6i’. Block 63 is therefore no
longer held upwardly by bell crank 61, but is 45
forced downwardly to its lowermost position by
spring 14, so that pivot 64 and all other mem
bers controlled by it assume their original posi
tions and the machine is closed and locked again
by engagement of the teeth ‘i2’, 13’.
50
The degree of opening of the machine is de
termined by the position of the pin 68. Thus to
open the machine a greater distance, arm 66 is
pinned at a lower position such as by passing
the pin 68 through the hole 75. As diagram-I
matically shown in Figure 5, if the connection
is as shown, pin 68 assumes position 16 and pivot
'59 assumes position ‘H. If arm 65 is pinned at
position '15, it assumes the position 78 after open
ing, which position is directly under position 16, 60
and pivot ‘it assumes the position ‘F9 which ‘is
further out than the position 11. Therefore,
the machine is opened a greater distance. In
changing the positions of pinning of arm 66, the
distance between pivot 64 and pin 68 changes. 65
To permit this, arm 56 is extensible, preferably
by being provided with the adjustable joint 80.
As thus far explained, the machine would be
racked and opened in each round. Since the
design may call for stitches without rack, it
would be impractical to open the machine ex
with the racking. Therefore, the opening device
cept when necessary. Therefore, the mecha
nism is made capable of being set into neutral or
is controlled by the racking means. Pull arm
75 39, as can be best seen in Figure 4, which pro
ure 8, when block 29 is raised beyond the point
out of work position as can best be seen in Fig
2,183,688
4
where pivot I'I occupies position 56, pivot I1 is
not effected. But if block 20 is raised high
enough so that pivot I‘I assumes position 82, the
upper part of block 20 forces lever arm 83
2.1 (Figure 4) upwardly. Since lever 83 is pivoted
at 84, say on guideway ‘I’, the other end 83'
presses plunger 85 downwardly.‘ When block 20
is lowered so that pivot I'I assumes position 86
(Figure 8), the lower part of block 20 comes in
ll) contact with the end of arm 81 (Fig. 4), and
pushes it down. Lever 81, 81' is pivoted at 88,
say,
on
a.
convenient
part
of
the
machine.
Therefore, the other end of arm 81' is raised,
which raises plunger 89 and thus lever arm 83.
Therefore again plunger 85 is pushed down the
same as when block 20 is raised to its highest
position. Thus, there are two positions of block
20 which may be utilized to set the machine into
neutral. When plunger 85 is pushed down, arm
90 of lever 90, 90’ is also pushed down. Lever
90, 90' is pivoted at 9|, therefore the other end
90’ is raised. Arm 90’ being in contact with
arm 93 of lever 93, 93’ at the extension 92, and
the lever 93, 93' being pivoted at 94, the end of
arm 93 is raised by the extension 92. Arm 93
has a downward extension hook 95 over which
slides pull arm 39. When the end of arm 93 is
raised, hook 95 raises pull rod 39 so that it does
not engage ratchet wheel 31 and thus the ma
30 chine is not racked. When the end of arm 93 is
raised, the other end, 93', opposite the pivot 94
is lowered and presses down on arm SI’ of the
opening bell crank 6|, 6|’, thereby rotating arm
position controlled by the racking mechanism.
If the racking mechanism is a little off, position
arm I02 will not register with a tooth IN on 5
sliding block I08. However, when the elevated
part 91 on arm 96 is away from roller 98 and pin
I05 is no longer held upwardly, spring II‘I pulls
the arms I02 together to cause the teeth to en
gage. If a tooth I0'I does not correspond exactly 10
with a notch on the slide I 08, the sides of I02
force the sliding block I08 into the proper posi
tion to bring the racking mechanism into an
exact position.
The structure and operation of the racking 16
mechanism for knitting machines according to
this invention will be apparent from the foregoing
description.
Various modi?cations will occur to those
skilled in the art in the disposition and con 20
?guration of the component elements going to
make up the invention as a whole, as well as in
the use of equivalent movements and instru-u
mentalities, and no limitation is intended by U‘
phraseology of the foregoing description or linu
tations in the accompanying drawings, except as
indicated in the appended claims.
What is claimed is:
1. In a knitting machine, in combination two
needle boards, reciprocating means to shift one 30
of the needle boards with respect to the other,
a member movable transversely on said recipro
cating means and formed with an aperture, a
obtainment of an exact position is also con
trolled by arm 8, according to the illustrated em
circular disc in the aperture, guideways ?xed on
the circular disc in a plane perpendicular to the
transversely movable member, a member movable
in said guideways formed with an aperture, 8. cir
cular disc in said aperture, a rod reciprocable in
the plane of the last named member, having a
bearing, a shaft journalled therein operatively 40
connected with the last named member and ec
centrically with the last named circular disc,
means to periodically rotate said shaft, means
to reciprocate the rod axially, comprising a bell
crank, one arm of which is connected with the 45
rod, and means to adjust the position of the
bodiment. To arm 8 is connected an arm 96
which has an elevated part 91. When arm 8 is
other arm of the bell-crank.
2. In a knitting machine, the combination of
BI and bringing roller 60 into such a raised posi
tion that the elevated part 59 of arm 58 can pass
beneath it. Therefore, the machine is not
opened.
Any position in which the eccentric 29-33 may
be set, may not be exact because roller 2| and
pivot I‘! each have some clearance. Therefore,
40
means is provided for securing an exact position
of the eccentric. Reference is again made to
Figure 1. Since racking is controlled by the end
less chains and, therefore, by pull arm 8, the
45
moved in one direction, the other end of arm II2
moves in the opposite direction and stops at a
retracted, this elevated part 91 comes in con
tact with roller 98 on a bell crank 99, 99' which
'50 is pivoted to a part of the frame by a pivot I00
and arm 99 is rotated about pivot I00 in a
counter-clockwise direction, as viewed in Fig
ure 3.
The other arm 99' is rotated upwardly
and with it pin I0 I, which connects the lower end
of the two arms I02 is also raised. To arms I02
are pivoted, as at I04, links I03. The other ex
tremities of the links I03 are pinned together
at I05. The upper ends of links I03 are in con
60 tact with a stationary bar I06. Therefore, when
the pin IOI connecting the lower ends of arms
I02 is pushed upwardly, the pivots I04 move out
wardly. When pivots I04 move outwardly, the
upper extremities of arms I02 and the teeth I04’
thereon also move outwardly a distance sufli
cient to disengage from the teeth III‘! on sliding
block I08. The block I08 is then free to slide on
the bar I06. Block 24, bearing on the recipro
cating rod 23, is formed with extensions I09 be
tween which is slidably mounted a block IIO
(Figure 6). Block H0 is pivotally connected, as
at I I3, to one end of a lever I I2, which is pivoted
at H4 and at the other end, arm H2 is similarly
pivoted to a block II5, as at IIG. When block
75 24, and thus the whole racking mechanism, is
cooperating needle boards, means to open the
needle boards by moving one away from the 59
other, means to rack the same needle board that
is moved and means to selectively control the
extent of separation and racking of the needle
boards.
3. Racking mechanism for knitting machines
5 5)
comprising, the combination with a relatively
stationary needle board and a shiftable needle
board, of means to control the amount of the
shift of the needle board comprising a pivotally
mounted bell-crank, guiding means for the pivot, 60
means to adjust the position of the guiding
means, and means to adjust the angular position
of the bell crank about the pivot comprising an
endless chain having links of varying height,
and operative connections between a link and 65
an arm of the bell crank.
4. Racking mechanism for knitting machines
comprising, the combination with a relatively
stationary needle board and a shiftable needle
board, of means to control the amount of the 70
shift of the needle board comprising a bell-crank
pivotally mounted in a movable member pro
vided with a slot, means to adjust the position
of the slotted member comprising an endless
chain having links of varying height, and opera
75
5
2,133,688
tive connections between a link and the slotted
member, and means to adjust the angular po
sition of the bell-crank about the pivot compris
ing an endless chain having links of varying
height, respectively, and operative connections
between a link and an arm of the bell-crank.
5. In knitting machines, the combination with
a relatively stationary needle board, a needle
board movable with respect thereto and racking
mechanism for the same needle board, of open
ing mechanism for separating the needle boards
comprising means operable by the racking mech
anism.
6. In knitting machines, the combination with
a relatively stationary needle board, a needle
board movable with respect thereto and racking
mechanism for the same needle board, of open
ing mechanism for separating the needle boards
comprising adjustable means operable by the
racking mechanism.
'7. Racking mechanism for knitting machines
comprising the combination with a relatively
stationary needle board and a shiftable needle
board, of means to shift the needle board com
, prising a pivoted member, a movable fulcrum for
said pivoted member, movable means to move
said pivoted member and movable means to move
said fulcrum, said last named means being so
related that said shiftable needle board is caused
to occupy a greater number of positions than the
sum of the positions occupied by said two last
named means.
8. The combination of a ?rst disc and a ?rst
block in which said disc is rotatably mounted,
guide means for said ?rst block, a second disc
and a second block in which said second disc
is rotatably mounted, perpendicular extensions
from said ?rst disc forming guide means for said
second block and means for rotating said sec
ond disc on an axis in the plane of said second
disc to reciprocate said ?rst block in its guide
means.
9. A mechanism for changing rotary motion
into a variable stroke reciprocal motion com—
prising a reciprocating member, a block mount
ed for transverse movement on said reciprocat
ing member provided with a circular opening,
a circular disc mounted in said opening, guide
members projecting vertically from the said disc,
a second block mounted for vertical movement
in said guide members and provided with a cir
cular opening, a second circular disc in said sec
ond block, a rotatable rod pivoted to said second
disc at a point away from the center of said
second disc, means for adjusting the position
of said rod in a path parallel to that of the re
ciprocating member and means for rotating said
rod in any of its adjusted positions.
10. A racking mechanism for a knitting ma
chine comprising a reciprocating member at
tached to a movable needle board, a block mount
ed for transverse movement on said reciprocat
ing member provided with a circular opening,
a circular disc mounted in said opening, guide
members projecting vertically from the said disc,
a second block mounted for vertical movement
in said guide members and provided with a cir
cular opening, a second circular disc in said 10
second block, a rotatable rod pivoted to said
second disc at a point away from the center of
said second disc, means for adjusting the posi
tion of said rod in a path parallel to that of
the reciprocating member and means for rotat 15
ing said rod in any of its adjusted positions.
11. A mechanism for changing rotary mo
tion into a variable stroke reciprocal motion
comprising a reciprocating member, a block
mounted for transverse movement on said re
20
ciprocating member provided with a circular
opening, a circular disc mounted in said opening,
guide members projecting vertically from the
said disc, a second block mounted for vertical
movement in said guide members and provided 25
with a circular opening, a second circular disc
in said second block, a rotatable rod pivoted in
said second disc at a point away from the center
of said second disc, means for adjusting the posi
tion of said rod in a path parallel to that of the 30
reciprocating member to insure movement of the
needle board the exact distance corresponding
to the number of needles racked.
12. A racking mechanism for a loom compris
ing a reciprocating member, a block mounted for 85
transverse movement on said reciprocating mem
ber provided with a circular opening, a circular
disc mounted in said opening, guide members
projecting vertically from the said disc, a second
block mounted for vertical movement in said
guide members and provided with a circular
opening, a second circular disc in said second
block, a rotatable rod pivoted to said second disc
at a point away from the center of said second
disc, means for adjusting the position of said 45
rod in a path parallel to that of the reciprocating
member, of means to control the amount of the
shift of the rod and thereby the needle board
comprising a pivotally mounted bell-crank, guid
ing means for the pivot, means to adjust the po
sition of the guiding means, and means to ad
50
just the angular position of the bell-crank about
the pivot comprising an endless chain having
links of varying height, and operative connec
tions between a link and of an arm of the bell
crank.
FRANK ECK.
55
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