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Патент USA US2137857

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Nov. 22, 1938.
R. c. ROBERT
DEVICE FOR EFFECTING .THE AUTOMATIC MOVEMENT
OF THE MATERIAL IN SHEWING MACHINES
Filed Deg. 1, 1936
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2,137,857
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Patented N... '22, 1938
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2,137,857‘
UNITED» sures PATENT OFFICE.
MOVEMENT OF THE MATERIAL IN SEW- ‘
ING MACHINES
Ramon Oasasltobert, Barcelona,’ Spain >
‘ Application December 1, 1936, Serial_No.‘113,538 ‘
In Spain September 23, 1935
p '6 Claims.
(cilia-210M“
‘ This invention has among its objects to pro-
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chines.
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c
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The essentialieature of the device according
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to the invention is that the complete movement
, It is known that sewing machines are formed,
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changed ‘but also the direction of the movement.
matic advance oi’v the material in sewing ma‘i
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‘ of‘ the movement 01 the toothed member be '
‘ vide means for e?ecting entrainment or auto+
b
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of the toothed member is e?ected by means of g
in the platform or arm on which the sewing is
a single triangular eccentric so constructed that.
done and in the zone or the'reciprocating move- in the course of two non-consecutive quarters of
merit of the needle, with an aperture across which ' its revolution, it e?ects respectively the advance
is projected'a toothed member which follows ‘a and the return .of the toothed member and that,
‘ 10 ‘ rectilinear path, that is to say, a path comprising ‘ in the course of the two‘ other .quartersoi its 10
“a, horizontal portion, the teeth being then above ‘revolution which are‘alternate with reference to
‘the level of the platiormrand then a substan- the quarters oi‘the‘ revolutioni?rst' mentioned.
tially‘vertical downward portion, a further horl- ‘ it e?'ects‘the necessary ascending and descending
zontal portion but in the reverse direction to the movements of the toothed membern ,
16 ?rst and below the platform, ?nally an upward
‘ substantially vertical portion. During this phase
oiqthe movement, thetteeth oi the member referred to grip the material which is being sewn
and which is ‘thus entrained during the ?rst
20 horizontal movement, by reason of the pressure
The device according to the invention is also 15
characterized by the feet thetthe teethed mem
her is displaced about it Pivotal Pblnt 50 that its
feed and return movements are e?ectedwhile de
scribing in ‘each case an arc 0! a circle and‘ its
ascending and. descending movements ere e!- 20
‘ i of the springwhich' acts on‘the presser ifoot of
iected along‘?irediwi 0! the said are.‘
the machine and‘ causes it to bear against the i
teeth. This operation is e?ected while the needle
is in the raised position.
25
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‘grammatically illustrated. by Way 01f. example. in
1 the accompanying drawing—-
The means ‘referred to ‘are ‘provided with devices for varying theadvance of the material.
In certain modern sewing machines, the direction
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:The device accordinl t0 the invention 18 die
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a,
Figure ‘1 18 8- lohl'itudlhal sectional elevation 26
of a sewing machine he-vinsaneedle pletemeunt:
ed on 9-11 arm and the ‘device to which the in
l of this movement ‘can also be reversed according Ventien reletes
i to the position occupied by the person operating ' -- Figure 2 is a transverse sectional elevation of
‘
30
,
the
machine.
‘
‘
V
the
The devices used, as well as the mechanisms
which actuate them and the. controlling ‘and op‘
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a
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erating parts with which they are provided,'are
arm.
,
.
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p
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i
i
Figure 3 1s a diagrammatic View of the de" ‘ ‘
‘Vice with 9- Krapmcal representatmn 05 its 09'‘
emtmn- ‘
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very complicated, are difiicult to construct and to
35 assemble and are dimcult and complex in working
Figure 4 1s 9- Perspective View °t 8' nmdmed
°°n$tm°t1°h Of the mechanism
_
a
and are liable, on account or their complicated
The devicecenbeanplied to sewins machines
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‘constructiomto‘be easilyda'maged‘and to make which have-?t their lower pert. that‘ 18 to, say
‘ a ‘noise and, to vibrate because they :are made below their Platform, alongitudinal shaft which
up'of such large and heavy members.
vis given a rotary movement. 'Rigid with this
40} , The device according to the invention is dis- 5113“, which is designated by the reference nu‘ 40
‘
,
“ anguished by its compactness, which renders, it
merall is a- triangular eccentric 2 which actuate:
‘ effective for use ‘in the most di?icult cases and
chie?y‘ in machines in ‘which the'needle ‘plate is
'
‘ a connecting rod 3 provided with “square hole
‘in “mm the‘mntm 2 n“ exactly" ‘
I
The other end of the connecting rod 3 forms a
mounted not on a platform but‘on an arm, which
7
4G facilitates various types of work, since it is pos_
t
,.
,
slide , member positioned between the guides ,8
.i
I
,
45
connectin
sible, by reason of the small section 01 the arm, “r5261; “K212335213? laugh: 21:1“ 3 wmc:
‘to‘mtmduce the arm in“? ‘the garments which ‘ forms the slide is circular; in the circular upper
‘ are‘ being, sewn even Where they have a ‘tubular
50 form as in the case 0! sleeves and stockings.
,
The device ‘aecordins to the invention is also
characterized by its extreme simplicity not only
part is secured a spindle 5 ‘normal to theplane , ‘
of: the connecting rod_
on tha spmdle 5 m w
mounted a link a which istalso mounted on an
other spmdle '| disposed-parallel to the spindle 5.
‘ as‘ regards construction but as regards control
The distance separating the geometric axes of
“ and operation since, by means of _a simple con- _ the spindles I and ‘I is the same as the distance
55 ‘trol handle or grip, not onlycan theamplitude separating the spindles ‘I from a shaft 0 from 55
2
2,137,867
which the spindle ‘l is carried by a member 8’
lying parallel to the link l and secured at one end
of this shaft 9 which extends the whole of the
length of the platform of the machine and is
mounted so that it can rotate through a de
termined angle. To the shaft 9 is firmly secured
an arm l0 which projects above the platform as
shown in Figures 1 and 2 but which may equally
well project laterally. The arm I ll ends in
10 manually operable adjusting means formed 'as a
screw H with a knurled head which screw can
be made to move up or down as desired and can
be held stationary at the desired height by means
of a lock nut ll ’. The point of the screw l l bears,
15 when the arm I0 is displaced, against a flat, ?xed
plate I2 which constitutes the geometric chord
of the are described by the point of this screw H
and which, furthermore, is greaterthe further
the pointed end of the screw is from the shaft 9.
20 This allows the inclination which the arm It
can assume to be varied and, thus also the in
clination of the member I’ which displaces and
carries the spindle ‘I, in order thus to vary the
stitch and the direction of sewing. The mecha
25 nism described which serves to displace the
spindle 1 around the shaft‘. as centre is secured
in the sewing position desired by means of a
spring formed in the present case as a rectangu
lar steel plate II, which is‘ curved and provided
at the middle with a portion which bears against
a depending member I I’ formed on the arm i0
and which plate is secured on two opposite sides
to the frame of the machine. The eccentric 2
further actuates a lever ll, provided with arms
I!‘ after the manner of a yoke. The eccentric 2
fits exactly between the arms II’. The lever II
is mounted on a fixed pivot ll. At the end of
the second arm of the lever I I and by means of
a gudgeon i6 is articulated the connecting rod 6
40 provided with a head II which carries the guides
6', 0n the head I1 is secured the member i6
carrying the teeth. The form. the mounting
and the configuration ofythis member, can be
varied provided that its contour is formed as an
45 arc of a circle with centre on the axis of oscilla
tion II of the connecting rod I.
.
The device hereinbefore described can be con
structed so as to be inoperative when desired,
- according to the nature of the work to be done by
50 the sewing machine, for example, for sewing a
hem with the machine. In such a case, as illus
trated in Figure 4, the triangular eccentric 2
is extended on the part opposite the shuttle by
a tube or sleeve 2' inywhich is formed an annular
55 channel in which are engaged the limbs of a
manipulating fork member 2".v The actuating
means may, however, be varied; At the opposite
triangular eccentric 2, the latter, during two non
consecutive quarters of the revolution actuates
the forked lever l3, which causes an ascending
and descending movement of the gudgeon IS, on
which is mounted the connecting rod 6 carrying
the head I‘! and, with the latter, the toothed
member IS. The said mechanism is conveniently
guided at its upper part by the guides 6' carried
by the head I‘! and by the circular slider forming
the upper part of the connecting rod 3. During 10
the other two quarters of the revolution made by
the eccentric 2, which are also not consecutive
and are consequently alternate with the first two,
the eccentric 2 actuates the connecting rod 3 pro
vided with the square hole 4 and imparts to it 15
an oscillatory up and down movement, and since
the circular slider of the connecting rod 3 is
pivoted by the spindle i to one end of the link 8
the said circular slider follows a curved path of
oscillation with the spindle ‘I as the axis of oscil
lation.
The circular slider of the connecting rod. 2
which slides between the guides 8' of the head
I‘! of the connecting rod 8 ensures the necessary
freedom of movement to the two systems de
scribed of which it forms a part.
When the link 8, with the spindle ‘I as axis,
oscillates under the action of the spindle I which
is mounted on the head or circular slider which
moves between the guides 6’ of the connecting
26?
rod 6, it cannot, owing to the sliding of this system
of guides and slider, give to connecting rod 6 an
up and down movement since the connecting rod
is held at the axis I5. It can thus only move
in the direction permitted by the constraint ap
plied to it, that is to say, it can only describe
an arc of a circle having as centre the point I5
and whose amplitude is proportional to the value
of the horizontal component of the arc described
by the spindle 5 whose geometric centre is at the
axis of the spindle 1. Further, the pivotal point
‘I of the link 8 can be moved and held stationary
by means of the-pivotal adjustment of the shaft
9 which is manipulated by means of the handle
Ill-ll with reference to the path of the spindle
5. Therefore, according to the position occupied
by the spindle 1, the horizontal component of the
are described by the spindle 5 will be nil or will
attain its maximum value in one or other direc
tion according to the setting of the said handle. 50.
In fact, when the spindle 1 is at the middle
of the part of the path of the spindle I repre
sented by the are a of a circle (Figure 3), as is
indicated at B, the horizontal component of the
arc described, which in this case will be its mini
mum, is practically nil, so that the system 8
l‘|—l6 does not move horizontally. There is
end to thatwhich is provided with a tube orsleeve, ' therefore no horizontal displacement of the teeth
the eccentric 2 is extended to form a truncated nor advance of the material but the group of
‘ portion which facilitates its entry both into the members indicated effects its vertical up and
crank l-with a‘square-hole I in its head, and down movement, since no adjustment is effected 60
between the limbs of the lever I! which forms of the members of the mechanism producing this
the lever articulated to the other connecting rod movement. When the spindle 1 changes posi
8, so that thus when it is necessary to hold the tion, following a regulating movement of the
teeth of the machine stationary, it sumces to. dis
shaft 9 effected by means of the handle II, and
place the triangular eccentric 2 so that it does passes to a position either above or below its 65
not actuate the corresponding connecting rods neutral point, wherever that position may be, the
3 and‘ 6.
The eccentric is secured to the shaft I, to move
in the direction of rotation of the shaft, by means
of a key which can be secured either to the eccen
tric itself or to the shaft, according to which
arrangement is more mechanically convenient.
The device operates in the following manner:
When the shaft I rotates, carrying with it the
horizontal component of the path following the
arc of a circle described by the spindle I is then
followed and is greater according as the adjust 70
ment of the spindle 1 is greater. It will be readily
understood that, according as the spindle 1 is
above or below the neutral position, the level of
which is indicated by the shaft 9, the movement
nearly level with the platform of the member>75
2,187,857
[3'
which carries ‘the teeth is‘effected in “either. a‘ “with a ‘spindle upon ‘the end ‘of the“ second con
forwarder rearward direction, asjis shown ‘in
“Figure 3. The shaft l‘uponwhich‘v the eccentric
2‘ is mounted may either be a ‘shaft provided “
necting ~rod disposed ‘ between‘ the said guide
surfaces, ‘a link pivoted on the said spindle, a
second spindle of adjustable ‘positicnfparallel,
speci?cally for‘ the purpose‘orit may be the shaft ‘i with the first ‘spindle, upon which‘ second spindle
‘which is normally employed to effect the move ‘the'link is also pivotally mounted, the said second
‘connecting rod moving up and'down during each
ment of ‘the ‘shuttle'of the-machine.
‘ The "device described can ‘vary,’ as" regards the "of the ‘two’ ‘non-consecutive“ quarters of the revo
‘ size and shape of the ‘different members forming \ lution made‘ by the eccentric, the said movement
it, and also as regards the materials used and‘as ‘ being alternate ‘with the movements of ‘the ?rst 10
‘ ‘regards its construction and assembly in‘general, ‘i connecting rod and theheadof the second‘ rod
“ provided that‘ the functionalv relations‘ between
the different parts remain the‘ same.
I claim:
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1. An automatic work-feed device for sewing
machines, comprising a toothed feed head, a con
necting rod at the one‘ end of ‘which the toothed
feed head is mounted, laterally disposed guide
surfaces provided on the said connecting rod
adjacent to the toothed feed head, a second con
necting rod the head of which fits slidably between
the said guide surfaces, a rotatable driving shaft,
a triangular eccentric mounted on the said shaft,
a bell crank lever one arm of which is ‘formed as
a fork to engage the triangular eccentric and
the second arm of which provides a pivotal axis
for the ?rst connecting rod, the disposition of
the fulcrum of the‘ bell crank lever and the tri
angular eccentric being such that during two
non~consecutive quarters of a revolution of the
eccentric the ?rst connecting rod and with it the
being constrained by ‘the said link to‘ follow a
pathalong ‘an arc of a circle about the second
‘ spindle,“ the horizontal component of the move
ment along the said path causing the ?rst con 16
necting rod and the toothed feed head associated
therewith also to follow a feed path which is an
arc of a circle struck from the pivotal axis ofthe
?rst connecting rod on the bell crank lever, the
amplitude of the movement along the said feed
path depending at any moment on the position
occupied by the second spindle in relation to the
horizontal plane which may be occupied by the
two spindles, and means for varying the position
of the second spindle in relation to the said horizontal plane, comprising ,a shaft disposed in the
said horizontal plane and in alignment with the
centre of the circular path which the ' second
spindle is constrained to follow, an arm upon the
said shaft for the support of the second spindle, 30
and a control handle secured to the said shaft
toothed feed head move up and down independ
ently of the movement and of the position at any
moment of the head of the second connecting rod
which constrains the ?rst connecting rod in re
for determining the position of the second spindle
by rotary adjustment of the said shaft.
4. An automatic work-feed device according
to claim 1, wherein the second connecting rod 35
spect of lateral movement, means for imparting
to the second connecting rod from the driving
is formed with a square opening in which is fitted
shaft a reciprocating movement and means for
determining the path of travel of the head of the
with a spindle upon the end of the second con
necting rod disposed between the said guide sur
faces, a link pivoted to the said spindle, a second
second connecting rod in relation to the path of
movement of the needle of the machine for the
adjustment of the length of the stitch and the
direction of the feed.
‘
2. An automatic work-feed device according to
claim 1, wherein the‘ second connectingv rod is
formed with a square opening in which is ?tted
the trangular eccentric and which is provided with
a spindle upon the head of the second connecting
rod disposed between the said guide surfaces, a
50 link pivoted to the said spindle, a second spindle
of adjustable position parallel with the ?rst
spindle, upon which second spindle the link is
also pivotally mounted,,the said second connect
ing rod moving up and down during‘each of the
two non-consecutive quarters of the revolution
made by the eccentric, the said movement being
alternate with the movements of the first con
necting rod and the head of the second con~
necting rod being constrained by the said link to
60 follow a path along an arc of a circle about the
second spindle, the horizontal component of the
movement along the said path causing the ?rst
connecting rod and the toothed feed head asso
ciated therewith also to follow a feed path which
65 is an arc of a circle struck from the pivotal axis
of the ?rst connecting rod on the bell crank lever,
the amplitude of the movement along the said
feed path depending at any moment on the posi-~
tion occupied by the second spindle in relation to
70 the horizontal plane which may be occupied by
the two spindles.
, 3. An automatic work-feed device according to
claim 1, wherein the second connecting rod is
formed with a square opening in which is ?tted
the triangular eccentric and which is provided
the triangular eccentric and which is provided
spindle of adjustable position parallel with the
?rst spindle, upon which second spindle the link,
is ‘also pivotally mounted, the said second con
necting rod moving up and own during each of
the two non-consecutive quarters of the revolu
tion made by the eccentric, the said-movement
being' alternate with‘ the movements of the ?rst
connecting rod and the head of the second con- ‘
necting rod being constrained by the said link to
follow a path along an ‘arc of a circle about the
second spindle, the horizontal component of the
movement along the said path causing the ?rst
connecting rod and the toothed ‘feed head asso
ciated therewith also to follow a feed path which
is an arc of a circle struck from the pivotal axis 65
of the ?rst connecting rod on the bell crank lever,
the amplitude of the movement along the said
feed path depending at any moment on the
position occupied by the second spindle in relation ‘
to the horizontal plane which may be occupied by
the two spindles, and means for varying the posi
tion of the second spindle in relation to thesaid
horizontal plane, comprising a shaft disposed in
the said horizontal plane and in alignment with
the centre of the circularpath which the second
spindle is constrained to follow, an arm upon the
said shaft for the support of the second spindle,
a control handle secured to the said shaft for
determining the position of the second spindle
by rotary adjustment of the said shaft, a screw‘ 70
mounted upon the control handle for adjustment
radially to the said shaft, means for ‘locking the
screw in any position of adjustment in relation
to the operating handle, and a plane plate dis
posed to form a chord of the arc of movement of 75
4
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the operating handle about the axis of the shaft,
pivot upon the second arm of the bell crank lever
upon which the connecting rod is pivoted, spaced
‘extreme positions of adjustment of the handle is ' guide surfaces upon the said connecting rod ad
(Bl-“88d to engage.
Jacent to the toothed feed head, a second con
, ‘ 5. An automatic work-feed device according to necting rod having the one end disposed between
claim 1, in which the shaft bearing the triangular the said guide surfaces and engaging the tri
eccentric is the shaft for effecting movement of angular eccentric by means of a square opening,
with which plate the point of the screw in the
the shuttle of the machine.
> _
6. An automatic work-feed device provided with
the triangular eccentric being axially movable
but non-rotatable on the shaft, one end of the
10 a toothed feed head, a connecting rod supporting _ said eccentric being truncated to facilitate en 10
the said toothed feed head, a rotatable driving
shaft, a triangular eccentric mounted on the said
shaft, a bell crank lever one arm of which, is
forked to engage the triangular eccentric, a ?xed
15 fulcrum pivot for the said bell crank lever, a
R?ement with the bell crank lever and the second
connecting rod, a sleeve secured to the eccentric,
an annular channel in the said sleeve, and an
operating fork engaging the said channel.
RAMON cases ROBERT.
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