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Патент USA US2109605

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MarchY 1~,~ 1938.
M_ WACHSMAN
2,109,605
STOP MECHANISM FOR KNITTING MACHINES
Filed May 19, 1937
INVENTOR.l
2,109,605
Patented Mar. l, 1938
UNITED STATES PATENT OFFICE
2,109,605
STOP MECHANISM FOR KNITTING
-
MACHINES.
l. ` Michael waehsman, Brooklyn, N. Y.
, 4Application May 19, 1937, Serial No. 143,407
'
'5 claims.
This invention relates to improvements in stop
mechanisms »for knitting machines of the type
shown in Reissue Patent 19,069, February 6, 1934.
The stop mechanism'disclosed in `said patent in
o cludes'el supporting box in which there is pivoted
<01. ca_-163i
end detector lever with relation to the box, parts
being in section and parts broken away.
Fig. 4 is a sectional view showing a modiñed
construction of the contact heel on the knot de
a knot detector lever-_and an end detector lever
both of whichsupport the thread from the bob
binsQWhenga knot-occurs the knot detector>
lever ispulled down and makes an electrical con
!o tact inside the box .whereby tofclose an electrical
circuit which inturn operates the stop mechanism
of a knittingmachine. When the thread breaks
4or runs out, the end detector lever rises by gravity
and likewise `serves. to close the electrical circuit.
l5 Inside the box arer electrical contact -springs and
thesaidtwo levers have contactheel which en
gage the said springs to close the circuit.~ This
-,i;ype_¿lof. stop mechanism is wellknown in the art.
vHeretofore the contact springs have been in the
gli formyof leafsprings which are not .easy to adjust
and:which_become readily bent out of shape by
continued‘iuse. Furthermore„being leaf springs
wrancbloredat one end they cannot readily be ad
justedtotsuch a fine degree as is required to space
25 theï'free'endsgfrom the `contact heels onthe de
tectorilevers. There is another disadvantage in
that `the contactclosingmechanism is enclosed
.iîwithinlthe box ‘and'itgisgtherefore not possible to
checkany changeainwthe positions oi the con
80 tactg'springs which’may vbe caused by wear or by
vibration or for other reasons.
The object of my'invention is to provide an im
proved contact -mechanism to be used within the
box of a device such as` described and disclosed in
35 the said patent andother patents. Specificallyy
the object~of myinvention is to employ spring
actuated levers in place of contact springs and
-to shape such levers Iso that they may be more
tector lever, parts being in section and parts 5
broken
away.
`
,
Fig. 5 is a. plan view of the modiiied contact heel
shown in Fig. 4.
‘ .
Fig. 6 is a view partly in-section and with parts
removed showing a modified construction of the l0
contact heel on the end detector lever.
In the drawing the contacting mechanism is
contained within a suitably rformed box I having
side walls 2 in which there is pivoted at 3 a gravity
actuated end detector lever 4 which extend for- l5v
wardly from the box, Figs. 1 and 3, and which is
caused to rise by means of a weight 5. At 6 there
is pivoted a knot detector lever 1 which has two
forwardly extending porcelain arms 8 one on each
side of the end detector lever 4. The lever 1 is 20
held in its upper normal position against stops 9
. formed in the front of the box by a spring I0 at
tached toa keeper II which moves between the
side walls of the box and is _adjustable by a screw
I2 whereby to adjust the tension of the spring I0. 25
'I'his arrangement is disclosed in prior patents.
It has been found, however, that because of vi
bration by the knitting machine the. keeper II
does not remain in adjusted position upon the
screw I2. I therefore propose to provide aV spring 30
I3 attached to the keeper and to the box. The
spring exerts a steady pull on the keeper and pre
vents lcoseness between the keeper and the screw.
Of course, when thekeeper is movedV up or down
to adjust the spring I Il, the spring I3 will be 35
stretched accordingly as will be understood. The
spring I0 is attached to the contact heel I4 of the
knot detector lever. Similarly the end detector
lever has a contact heel I5.
It is desirable that the contact making mecha-> 40
easily,- and smoothly engaged by the contact heels.
40 This_.makes fora more positive and precise opera v nism to be used in the box be so arranged that it
tion;A Other objects of my invention are to pro
may be assembled as a unit and thereafter at
vide>` certain improvements which will be pointed tached without requiring any special tools or
‘ì out hereinafter and which serve chiefly the pur
special eiïort. In the present instance this mech
pose of. more efiicient operation.
anism is embodied in a contact plate I6 in which 45
Accordingly. my invention is embodied in a there is pivoted at'I1 and I8 respectively an upper
stop mechanismfor knitting machines arranged and a lower contact lever I9 and 20. The upper
[j and constructedè‘as hereinafter set forth and as lever has a stop 23 and a contacting arm 2I
' Iillustrated in the accompanying drawing in which
which ends in a hook 22. The lower lever 20 is
Fig. 1 is a sectional view of the stop mechanism formed with a contacting arm or portion 2l and is 5o
also provided with a stop 25. A spring 26 is at
with parts removed and parts broken away.
Fig. 2 is a face view of the contacting levers
which are engaged by the contact heels.
Fig. 3 is a horizontal detailed view showing the
u arrangement of the knot detector lever and- the
tached to the two levers as shown and serves to
keep them in contact making positions, the stops
23 and 25 engaging the contact plate for this pur
pose as shown and as will be understood.
55
2
2,109,605
'I'he contact plate with its levers is mounted
in the box I before the cover 21 is attached and
the attaching means may be a screw 28 and a
bolt 29 which pass through the back of the box
and whereby the plate- is accurately positioned
with respect to the two contact heels I4 and I5.
The contact plate is suitably insulated from the
box as indicated at 30. 'I'he bolt 29 serves as a
.fixed circuit terminal in a manner well under
10 stood in the art, the circuit being indicated by
the wire 2|.
'
'I‘he normal positions of the parts are as shown
in Fig. 1. If a knot occurs on the thread 22, both
levers will be pulled down. The contact heel I4
15 therefore rises and engages the contact portion
24 of the lever 20 with an easy wiping movement
and thereby closes the ' circuit, the operation
so
being well known in the art. When the thread
breaks or runs out, the end detector lever will
rise and its contact heel I 5 will engage the con
tacting arm 2| with an easy wiping movement.
engaged by the contact heels of the said upper
and lower thread supporting levers and means
including a ilxed electric circuit terminal for
supporting the contact plate in the housing to
position the contact arms in operative relation to
the said contact heels.
2. In a stop mechanism of the character de
scribed, a housing, an upper and a lower thread
supporting lever pivoted on said housing, each of
said levers having a contact heel extending with 10
in the housing, a contact plate, an upper and a
lower contact arm pivoted on said plate, spring
means secured to the contact arms for keeping
the same in predetermined position with respect
to said contact plate and to permit movement of
said arms with respect to the plate, means for
securing the latter within the housing with the
said contact arms in relative predetermined
operative positions with respect to the heels of the
said thread supporting levers.
20
3. In a stop mechanism of the character de
scribed, a housing, an upper and a lower thread
stopped by the hook 22. This occurs when thev supporting lever pivoted on said housing, each of
lever 4 reaches the dotted position at I3. The said levers having a contact heel extending with
25 contact lever I9 therefore serves a two-fold pur
in the housing, springs secured to said contact 25
' pose in that it closes the circuit by contacting the heels to maintain said levers in predetermined
end detector lever and also stops the end detector ilxed positions within the housing, a contact
lever in its upward swinging Jmovement so that .- plate, an upper and a lower contact arm pivoted
it is not necessary to provide the end detector on said plate and adapted to swing with relation
'30 lever with a special bend or like means to in
to the plate, a spring connecting said contact 30
sure that the lever does not swing too far.
arms to maintain the latter in predetermined
Fig. 4 illustrates a modification in which the ilxed positions with relation to the plate and
knot detector lever 1 is provided with a contact electric connecting means for connecting the con
shoe I5 which, when the lever is pulled down by tact plate to the housing.
the thread, engages the contact arm 38 of the
4. In a stop mechanism of the character de» 35
contact lever 41 pivoted at Il on the contact scribed, a housing, an upper and a lower contact
plate I6. In this instance the' contact lever is lever pivoted on the housing, each oi.’ said levers
held in its upper predetermined position by a having a contact heel extending within the ’
spring 39 which is coiled around the pivot 3l. housing, a~ contact plate, an upper contact arm`
40 _With a construction as in‘ldg. 4 the knot de-v
pivoted on said plate, a stop on said contact arm
tector lever will likewise be kept in position by adapted to be engaged by the upper contact heel,
an individual coiled spring. 'I'his is not shown a lower contact arm pivoted on said plate and
because it is a duplicate of the spring Il, the adapted to be engaged by the lower contact heel,
construction being the same.
spring means connected to said contact arms to
It may not always be desirable to have an maintain -the same in predetermined yielding
. 'I'he rising movement of the lever 4 will be
:outside-weight as l in Fig. 1. -Il'ig. 6 therefore
illustrates a modification in which the detector
lever Hs provided with a counterweight 40 with
in the box. ’I'he counterweight is adapted to en
gage the upper contact lever I9 as will be under
stood. The weight is'fattachedl to the lever 4 by
a set screw 4L which also serves to attach the
upper end of a spring 42 the tension of which is
_. adjustable by a screw 43. The construction in
Fig. 6 includes the advantage of a very iine ad
justment of the end detector lever by the
spring 42.
I claimz-
,
1. In a stop mechanism of the character de
scribed, a housing, an upper and a lower thread
65
positions with respect to the said contact heels
and means for securing the contact plate to the
housing.
5. In a stop mechanism of the character de
scribed, a housing, an upper and a lower contact 50
lever >pivoted on the housing, each of said levers-
having a contact heel extending within the hous
ing, a separate weight forming the contact heel on
one of said levers, a contact plate, an upper con
tact arm pivoted on said plate, a stop on said
contact arm adapted to be engaged by the upper
contact heel, a lower contact arm pivoted on said
plate and adapted to be engaged by the lower
contact heel, spring means connected to said con
tact arms to maintainthe same in predetermined 60
supporting lever pivoted on said housing, each
of said levers having a contact heel extending
within the housing, a contact plate in the hous
heels and means for securing the contact plate
ing, an upper and a lower contact arm pivoted on
to the housing.
the contact plate and adapted respectively to be
yielding positionsl with respect to thesaid contact
'
MICHAEL WACHSMAN.
05
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