Патент USA US2137857код для вставки
Nov. 22, 1938. R. c. ROBERT DEVICE FOR EFFECTING .THE AUTOMATIC MOVEMENT OF THE MATERIAL IN SHEWING MACHINES Filed Deg. 1, 1936 1. ‘ 7 2,137,857 ‘ ‘ V ' ' Patented N... '22, 1938 - t ', 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- ‘ ‘ chines. i '- l c . i , The essentialieature of the device according i to the invention is that the complete movement , It is known that sewing machines are formed, ‘ ‘ ‘ changed ‘but also the direction of the movement. matic advance oi’v the material in sewing ma‘i ' ‘ of‘ the movement 01 the toothed member be ' ‘ vide means for e?ecting entrainment or auto+ b ‘ 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 ‘ ‘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 > :The device accordinl t0 the invention 18 die ' ' 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‘ ‘ a I erating parts with which they are provided,'are arm. , . ' p ‘ i i Figure 3 1s a diagrammatic View of the de" ‘ ‘ ‘Vice with 9- Krapmcal representatmn 05 its 09'‘ emtmn- ‘ i i - l 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 ' ‘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: 15 ‘ i 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 9,187,857 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.