US2682845A

US2682845A - Zigzag sewing machine

Info

Publication number: US2682845A
Application number: US84608A
Authority: US
Inventors: Robert Ramon Casas; Renck Paul
Original assignee: Mefina SA
Current assignee: Mefina SA
Priority date: 1948-12-20
Filing date: 1949-03-31
Publication date: 1954-07-06
Anticipated expiration: 1971-07-06
Also published as: CH297807A; BE492433A; NL88362C; GB683380A; DE821458C; FR1008799A; GB683293A; CH297806A; GB683291A; FR1000403A; DE825333C; CH279597A; GB683379A; CH277952A; US2652795A; NL91135C; NL81093C

Description

July 6, 1954 R. cAsAs ROBERT ET AL 2,682,845

ZIGZAG SEWING MACHINE Filed March 51, 1949 1o sheets-sheet 1 1' E* E 57 l\ H1 E w1 .n gg o` v Tuna Hi# o`/ v ,n l

a a g m I t f3 R f s E r'' LA l Q 1 a l 7 4 y N\\/ l lr 1 y H 1 R R Il l s! 0 -o a 8 R u' R July 6, 1954 Filed March 5l, 1949 R. cAsAs ROBERT Er Al.

zIGzAG SEWING MACHINE- 110 Sheets-Sheet 2 July 6, 1954 R. cAsAs ROBERT ET A'. L2,682,845

ZIGZAG SEWING MACHINE l0 Sheets-Sheet .3

Filed March 3l 1949 July 6, 1954 R. cAsAs ROBERT ET AL 2,682,845

ZIGZAG SEWING MACHINE Filed March l, 1949 l0 SheetsQSheet 4 Tig.4

`Iuly 6, 1954 R. cAsAs ROBERT ET Ax. 2,582,845

l ZIGZAG SEWING MACHINE Filed March 51, 1949 A 10 shuts-sheet' 5- mumllll O\ July 5, 1954 R. cAsAs ROBERT ET AL 2,682,845

ZIGZAG SEWING MACHINE Filed March 51, 1949 1o sheets-sheet e K I l lll-I l I I I -l I l, Y Lf VJ LI] I Wg @pmy July 6, 1954 R. cAsAs ROBERT ET AL 2,682,845

ZIGZAG SEWING MACHINE Filed March 31, 1949 1ro sheets-sheet 7 July 6, 195.4 R. cAsAs ROBERT ET A1.

ZIGZAG SEWING MACHINE l0 Sheets-Sheet 8 Filed March 3l 1949 VvE/vrais @uw Quer-@afer fg/z ma? July 6, 1954 R. cAsAs ROBERT ET AL 2,682,845

` ZIGZAG SEWING MACHINE Filed March 5l, 1949 l0 Sheets-Sheet 9 C) mm 11.11,

RAMON CASAS-'ROBER T PAUL RENCK @WMJM July 6, 1954 R. CASAS ROBERT ET Al. 2,682,845

ZIGZAG SEWING MACHINE Filed March 51, 1949 l0 Sheets-Sheet lO 'ragd l'igc Figb Tiga

Kkklllk fVWVVVWVMMMMMMMMAMAAMMnAA/VWMMMMMMMMAM NvENToRs RAMON CASAS ROBERT B PAUL RENCK Patented July 6, 1954 zIGzAG SEWING MACHINE Ramon Casas Robert and Paul Renck, Geneva,

Switzerland, assignors to Melina S. A., Binningen, Switzerland, a corporation of Switzerland l Application March 31, 1949, Serial No. 84,608

Claims priority, application Switzerland December 20, 1948 23 claims. (o1. 11e-15s) The present invention relates to a sewing machine comprising a shuttle located in the end of an arm and including a main shaft, driving an actuating mechanism for the needle-carrier in a to and fro vertical movement, a controlling device for the actuating mechanism of the feeding device for effecting modications of the extent of the pitch of advancement of the cloth under the needle, and a mechanism causing displacements of the needle-carrier perpendicular to the yadvancement displacements of the feeding device.

The known machines enable generally to do straight or zig-Zag seams by acting onv a controlling element operable to put in service or out of service the device for the formation of the zig-zag stitch. The designers have further provided their machine with hand controlling elements operable to modify the size of the zig-zag stitch, that is to say to modify at will, either the extent of the lateral displacements of the needle-carrier, or the middle position of the needle-carrier, or the extent of the displacements of the feeding device and, consequently, the extent of the pitch of advancement of the cloth under the needle. These machines thus permit by acting on these controlling elements, the theoretical obtention of all kinds of zig-zag stitches. But it is clear that, practically, it is not possible to permanently manually operate these elements with all the desired accuracy for the obtention of a'regular seam or decorative pattern. The sewing machine in accordance with the invention, aims at remedying this drawback by the fact that it includes an operating station having two interchangeable cams driven in rotation by the main shaft, and of which the first one, mechanically connected to the needlecarrier, causes lateral displacements of the latter perpendicular lto the advancement displacements ofthe feeding device, whilst the second one, mechanically connected to the driving mechanism of the said feeding device, causes modification of its advancement stroke.

The attached drawing shows diagrammatically and by way of example a form of construction of the sewing machine'.

EFig. 1 is aprole view of the needle-carrying arm, certain parts being seen in axial crosssection, a part of the casing being broken away.

Fig. 2 is a profile view of the arm enclosing the driving mechanisms for the shuttle and the feeder.

Fig. 3 is a front view of the needle-carrying 2 arm and of the arm of the machine, certain parts of the casing being withdrawn.

Fig. 4 is a cross-sectionvview along the line. IV--IV of the Fig. -1 and on which only the manual controlling elements are illustrated.

Fig. 5 is a. View from above of the needlecarrying arm, certain p arts of the casing and of the elements vof the operating station being broken away.

Fig. 6- is a part view of the needle-carrying arm, certain parts of the casing and of the operating station being broken away.

Figs. '7a to 7h illustrate a few types of simple zig-zag and decorative stitches which it is possiblev to obtain with the described sewing machine.

Fig. 8 is a perspective view of the driving devices for the feeding device and for vthe shuttle.

Fig. 9 is a part cross-section view of the small end of the connecting rod actuating the needlecarrier.

Fig. 10 is a top view of the driving mechanisms for the feeding device and for the shuttle housed in the arm.

Fig, 11 is a'perspective detailed View of the actuating cams and a-portion of the associated needle bar shifting mechanism,

Fig. 12 is a fragmentary elevational View of the needle bar shifting link partly in section as would appear on line XII-XII of Fig. 5.

Figs. 13a,` 13b, 13c-and 13d.are similar plan views of four different cams usable in the apparatus of the present invention.

Fig. 14 is a fragmentary perspective view of a portion of the head of the sewing machine illustrating the cams in their positions.

Fig. l5 is a chart illustrating the various types of stitching obtained by placing the cams of Figs. 13a, 13b, 13e and 13d in the various positions of Fig. 14'.

The machine shown by way of example on the attached drawing includes a column I bearing a work supporting arm 2 and a needle-carrying arm 3. All driving mechanisms for the various elements of the machine are contained in and xed to a frame constituting a casing of harmonious shape; formed by the arm 2, the column VI and the vneedle-carrying arm 3. The upper arm or needle-carrying arm 3, contains a main shaft 4 carrying at one of its ends a fly-wheel 5 and a driving pulley 6. This upper arm 3 has at its free end a head containing the needle-carrier 1, thethread-pullerv (which is not shown) and their actuating mechanisms driven lby the main shaft .4. These-actuating mechanisms being not o the object of the present invention will not be described here in greater detail.

The column I contains transmission elements 8 connecting mechanically the `main shaft 4 to the actuating mechanisms for the feeding device IIJ and the shutle 9, housed in the arm 2.

The machine, in accordance with the invention, includes at an operating station, actuating cams mechanically connected, on the one hand to the needle-carrier 1, and, on the other hand, to the actuating mechanism for the feeder. In the form of construction shown on the attached drawing, these cams are housed in the upper arm and includes an axle I I (Fig. 1) revolving in a bearing I2 fastened to the frame or casing of the machine. This axle is driven in rotation by the main shaft 4 by means of a worm I3 and a gear I4 and carries, rigidly fastened on its end, a driving part I5. The latter has a seating surface I6, a cylindrical shank I1 and a threaded portion I8. Two actuating cams I9 and'20' kept at a distance one from the other by a stay 2I are engaged on the cylindrical shank and pressed on the annular seating face I6 by a tightening element 22 screwed to the threaded portion I8.

The angular positions of the cams I9 and 2i), in relation to the axle Il, are defined by a finger 23 (Fig. 6) fastened to the driving part I5 and engaged in an opening 24 made in each of the said cams I9 and 20.

The cam I9 is mechanically connected (Figs. 3 and to a support 25 rocking on an axle 26 and bearing the needle-carrier 1. This support 25 includes two guides 21 into which slides the rod 1 carrying the needle 28. The mechanical linkage between the support 25 and the cam I9 is achieved by means of an arm or link 29 hinged at r, by one of its ends, on the said support 25 and carryingat its other end a nger 30 kept into kcontact with a lseating surface 32 by means of a spring 3| (Fig. 5). The position of this finger 30 along this seating surface 32 is defined by a controlling element R. fastened to la socket 33 (Figs. l, 5) revolving freely on an external cylindrical shank 34 of the bearing I2. This socket 33 carries an arm 35, of Which one end is fitted with a finger 36 engaged in a groove made in the end of the arm 29'. The seating surface 32 is fastened to a lever 31 hinged at 5lJnto the end of one of the arms of an operating lever 38 of which the second arm carries a small plate 33. The latter has a finger 40 engaged -in a groove 4I in the form of a spiral made in a controlling element M revolving on an aXle 43 fastened to the frame of the machine. This controlling element M is constituted by a knurled disc, of which a part of the periphery emerges from Athe casing of the machine through an opening 44. The angular position of the small plate 39 can be modified and iixed by means of an eccentric 45 fastened to the lever 33, engaged ina port 46, and to a securing element 41 constituted by a screw. The lever 38 is, in addition, subjected tothe action of a spring 48 tending to cause its revolving in a clockwise direction around its pivot 49 fixed rigidly to the frame of the machine. Finally, the lever 31 further carries a finger 5I normally kept in contact with the profile of the cam I9 by the action of the spring 3 I.

The positions of the controlling element R are defined by a nger engaging itself, under the action of the self-elasticity of this element R, in drillings 52 made in a part 53 rigidly iixed to the frame of the machine.

The Working of the actuating device for the 4 58 fixed on the needle-carrier 1.

needle-carrier 'I in a rocking movement is as follows:

When the main shaft 4 is in rotation, it drives the cam` I8, which in turn, actuates the nger 5I, kept in Contact with the profile of this cam I9. This finger 5I is therefore actuated in a to and fro movement against the action of the spring 3l. Thus, the lever 31 performs a rocking movement around its axle 5G and actuates the support 25 in a similar movement by means of the arm 2 carrying the finger 3U kept in contact with the seating lsurface 32. The extent of the rocking movement of this support 25, as well as that of the needle-carrier 1, is a function of the position of the ringer 35 along the seating surface 32. Indeed, the farther this finger 3G is from the `pivot 50 of the lever 31 on the lever 38, the greater is the extent of the rocking movement of the needle-carrier 1.

The rocking of the support 25 effects displacements of the needle-carrier 1 in a way parallel to itself and perpendicular to the advancement displacement of the feeder. These displacements of the needle-carrier 1 are synchronized with the vertical reciprocating movement of the needle. The result is that the stitches are no longer in line one with the other, but in zig-zag, 'as shown on the Fig. 7b or 7c, for instance. The position of the `finger 30 valong the seating surface 32 can be modified, chosen and fixed at will by acting on the controlling element R which makes it possible to choose and fix at will the extent of the displacement ofthe needle perpendicularly to the advancement displacement of the work feeder.

Practically, itis of advantage to design the profile of the `cam i9 in such a way that the side displacements of the needle-carrier take place whilst the needle is outside the cloth, that is to say during the' last part of the ascending stroke and the first part of the down stroke of the needle-carrier.

When the finger 33 is in front with the articulation 50 (position shown on the drawing Fig. 5), the extent of the rocking movement of the support 25 is naught. By further displacing by a step this element R. in a clockwise direction from the position shown on the Fig. 5, the operator causes the finger 30 to pass to the side of the pivot 59 opposed to that carrying the finger 5I. At this moment, the spring 3l causes the rocking ofthe lever 31 in a clockwise direction as far as a position defined Vby a stop n fastened to the lever 3B, and for which the finger 5I is out of lreach of the lprofile of kthe cam I9. For this last position of the controlling element R, the support 25 is consequently kept in a fixed position and the cam I9 can have no action at all on it, so that the machine does a perfectly straight seam.

The controlling element M enables the operator to vchoose and to the lateral position of the needle 28 in relation to the feeder. Indeed, the angular displacement of this controlling element M causes, by means of the finger engaged in the groove 4i having a spiral form, an angular displacement of the lever 38 and therefore of the hinge 58 of the lever 31, and consequently, an angular displacement of the support 25 around its axle 25.

As shown on the drawing and in Patent No. 2,578,225 of December l1, 1951, the needle-carrier 1 is driven in its vertical reciprocating movement by a rod 54 hinged, on the one hand, on a crank pin 55 driven .by the main shaft 4 and, on the other hand, .by an axle 5B fastened to a collar In order to allow the displacements of the needle-carrier, parallelly to itself, this axle 5E slides freely in the drilling of the'head of the rod 54 (Figs. 3 and 9). The latter has a groove 59, in which is engaged a guide 6|! rigidly fixed to the frame of the machine.

The cam 20 is mechanically linked to the actuating mechanisin of the feeder i (Figs. 2 and 8). This actuating mechanism will only be described here in so far as it is necessary for the good undertsanding of the Working of the device causing modifications ofthe advancement stroke of the feeder Iii. The latter is carried by a support 6| having the general form of a U, of which both wings have a guide g in which slides an axle B2,

rigidly fixed to a collar 63. The latter is arranged f 61 carries a rod 99sliding in guides 1|) and 1| and on the end of which is rigidly fixed an actuating element 12. ing rod i3 engaged in a port 80 made in the arm 61, a finger 14 engaged in a guide 15 having an adjustable position, and a seating element 16 kept in contact with the profile of an actuating cam 8| by the action of a spring 11 engaged on the rod 69 and resting on a seating surface 18 fastened to the arm B1 on the one hand and, on the other hand, on a seating stop 19 fastenedto the rod 69.

The actuating cam 9|,

actuating element 12 against the action of the spring 11. Now, the finger 14 being engaged in the adjustable guide 15, it is clear that the actuating element 12 performs a to and fro movement in the plane of the guide 15 which is inclined in relation to the plane perpendicular to the rotation axle 92 of the actuating. cam 8|. Consequently, the

arms

61 and 65 are driven by the rod in a rocking movement around their pivoting axle 54. The result is that the feeder I0 is actuated in a to and fro movement parallel With the rotation axle B2 of the actuating cam 8| The support 5| is, in addition, fixed to one of the ends of an elastic arm 93 articulated at 84 on the frame of the machine and of which the other end carries a rigid finger d kept, by the action of a spring 85, in contact with the proiile of the cam 8|. It follows that the feeder I9 is driven in a vertical to and fro movement perpendicular to the rotation axle 82 of the cam 8|,

.frame the machine. This part 86 is rigidlyfixed to the end o-f a driving shaft 89, housed in the column l and subjected to the action of a'return spring 90.

The upper end of the driving shaft B9 (Fig. 1)

carries an actuating element 9| provided with a at surface 92 situated on a plane parallel with a diametrical pla-ne of the driving shaft 89. This flat face 92 is kept in contact with a driving finger The latter includes: a guid` driven inl rotation by 5 transmission elements, periodically actuates the 93 by the action of the return spring 90. The finger 93 is rigidly fixed .to the end of one of the arms of a lever 94, pivoted to an arm 96 by means of pin 91 revolving in a bearing 98, arranged in the arm 96. The second arm of the lever 94 (Fig. 6) carries a linger 99, kept in contact with the profile of the cam of the operating station, by the action of the return spring 99. This is effected by bringing the end |99 of arm C in contact with finger which holds the arm 96 xed. The pin 91 carried by arm 96 is also stationary so that arm 94 can pivot about the pin 91. Spring eli 99 urges shaft 89 to rotate which causes the face 92 to move the finger 93 on the end of arm 94, Which in turn urges the finger 99 of lever 94 against the surface of cam 20. The arm 96 is pivoted at |00 to the frame of the machine. l

The operating station further includes a hand controlling element |02 operable to interrupt the mechanical connection linking the cam 20 to the guide 15. This controlling element consists of a three arm lever a, b, c (Fig. 4:) and having a notch |03 engaged on a cylindrical extension |04 (Fig. l) of a bearing carrying'the main shaft 4 and rigidly fastened to the frame of the machine. The control element |92 is held on the said cylindrical extension by a blade spring |95 xed by means of a screw |96 to the arm b. The arm c emerges from the casing of the machine through ar port |01 (Fig. 5), arm b has a beak lds which forms part of an arcuate camming surface adapted to engage the element llt and thereby angularly displace the shaft B9. Arm c has a portion |09 bent at a right angle to the arm c and adapted to abut the member The curved part of beak |08 ofarm b and the beak |99 of arm c are intended to come into engagement alternately, in accordance with the angular position occupied by the arm a along the port |91, with actuating fingers H0 and III, of which one is fastened to a collar rigidly xed to the shaft '89, while the other constitutes an extension of the arxn 96. Finally, lthe arm a is arranged between two adjustable stops ||3 and H15. constituted each by a lever having a notch ||5 engaged in aV groove H6 made in the cylindrical shank |54, and provided With an actuating element ||1 and a lock l HB. This lock acts in conjunction with hollows ||9 made in the part of the casing adjoining the port |01, under the action of a spring |29, resting, on the one hand, on the lever by its two ends, and, on the other hand, on-the bottom of the groove IIB by its middle part.

The working of the device operable to modify the extent and the direction of the displacements of the feeder is as follows:

For all the angular positions ofthe controlling element |02 situated between the two stops H3, I I4, placed in the angular positions shown on the Fig. 4, camming surface of arm b and of the beak |08 acts on the finger ||0 and angularly displaces the driving shaft 89, and therefore the guide 15, to a given position, against the action of the spring 90. On the contrary, the beak |09 is out of reach from the finger IH, so that a spring |2| (Fig. 5) acting on the lever 94 keeps,

on the one hand the linger 93 (Fig. l) in contact with the face 92 of the actuating elementl 9| and, on the other hand, the finger 99 out of reach from the cam 20. Thus, for all these positions of the arm a of the controlling element |02, the mechanical connection between this cam 2i) and the guide 15 is interrupted. The result is that the inclination of the guide 15, in relation to a plane 'perpendicular to the rotation axis of the cam=8| actuating the feeder element, is solely av function of the angular position of the arm a. along the port IBI between the two adjustable stops H3, -I I4.

In addition, as shown on the drawing, Fig, 4, when the arm a is situated at an even distance from the stops I I3 and I I4, placed in the positions shown on the Fig. Il, the said arm a. is then situated in front of a mark (Fig. 5) andthe groove is situated in a plane perpendicular to the r0- tation axis of the cam 8|. In consequence, for this position of the arm a, the lever 65-67 performs no rocking movement at all and the advancement stroke of the feeder is naught.

Finally, a study of Fig. 4 shows that by displacing the arm a in one direction or in another, the operator has the possibility:

(l) Of reversing the direction of the advancement stroke of the feeder and theefore the direction of the displacements of the cloth under the needle;

(2) Of modifying, choosing and xing the extent of th-e advancement stroke of the feeder and therefore of choosing at will the extent of the advancement pitch of the cloth under the needle.

As the reversing of the direction of the advancement stroke is obtained by simply modifying the direction of inclination of the guide '15, this reversing can obviously be done during the running of the machine, which makes it possible to obtain a sequence of stitches such as shown on the Fig. '7o. In addition, the operator can fix in advance the values and the direction of the two respective advancement pitches by adjusting the position of the two adjustable stops II3 and H4, which greatly facilitates the a-ccurate hand operation of the controlling element |02.

Now, if the operator puts inaction the actuating device for the needle-carrier in a rocking movement, controlled by the cam I9, by operating the controlling element R, he can obtain very easily a sequence of zig-zag stitches, such as shown on Fig. 7b or Fig. 7c, for instance.

In order to get automatic modifications of the advancement pitch of the cloth while working, with a view of achieving a drawing or a decorative motive, it is sufficient to lower the arm a and the two stops I I3 and IM as far as into the end |25 of the port I'l (Fig. 4). For this latter position of the arm a, the beak |538 is out of reach from the finger I IB and the beak |09 acts on the linger III and keeps it in the position shown on the Fig. 6, against; the action of the spring |2I on the one hand, and on the other hand, of the spring S of the axle 89. Thus, the finger S9 is kept in contact with the profile of the cam 2B. The latter therefore actuates the lever 9A, of which the finger 93 defines the angular position of the iiat surface S2 fastened to the driving shaft 89 and' provokes modications in the inclination angle of the guide i and, in consequence, modifications of the extent and of the direction of the advancement displacements of the conveyer.

By examining the attached drawing, it will be seen that, yaccording to the inclination direction of the guide i5 in relation to the plane perpendicular to the rotation axis of the actuating cam 8|, the feeder IE] is actuated in the normal running direction or in the opposite direction. It is thus easily possible to achieve a seam forming drawings or decorative motives, such as shown on Figs. 1f and 7g, by properly choosing the cams I9 and placed in the operating station.

Indeed, these cams are very easily interchangeable, since it is sufcient to lift a cover C and to unscrew the knurled nut 22 to permit their withdrawing or placing. The diagrams of Figs. 7a to 7h show, by Way of example, a few seam stitches which it is possible to `obtain automatically and are suficient to show the great possibilities given by the machine.

As shown in Fig. 15 it is possible to automatically produce sixteen different types of stitching with the machine according to the present invention.

The four lines of stitching shown in the upper horizontal row of the diagram of lig. 15 is obtained by using only one of the four cams I, 2, 3' and 4 shown in Figs. 13a, 13b, 13e and 13d respectively in the Z position indicated in Fig. 15. In each case represented in the upper horizontal row of Fig. 15 the feed is constant.

The second horizontal row of the diagram of Fig. 15 shows the types of stitching obtained with the same cams in the Z position, but also with certain cams in the 'I position.

The third horizontal row and the lower horizontal row show types of stitching obtained by various combinations of the cams I, 2, 3 and c in the Zand 'I' positions. Thus with four cams, it is possible to obtain sixteen different types of stitching by arranging various combinations and permutations of the cams in the two positions on the cam shaft.

A form of construction has been described here with reference to the attached diagrammatical drawing, but it is clear that all described elements and mechanisms can be simply replaced by their equivalente.

We claim:

l. A sewing machine including a main shaft, a needle-carrier, a driving mechanism driven by said main shaft and driving said needle-carrier in a vertical reciprocating movement, a feeder, an actuating mechanism driven by said main shaft, a controlling device for said actuating device operable to effect modifications of the stroke of said` feeder so as to permit modifications of the extent of the advancement pitch of the cloth under the needle, a mechanism driven by said main shaft and effecting displacements of said needle-carrier perpendicular to the advancement displacements of said feeder,

-and comprising a cam-shaft driven by said main shaft, and two cams, the rst controlling the lateral displacements or" the needle and the second the extent of the stroke of the feeder, said cams being removably mounted on said canishaft, said cams being independent one from the other, interchangeable and permutable, a mechanical .connection connecting the nrst of said cams to said needle-carrier and effecting lateral displacements of said latter perpendicular to the advancement displacements of said feeder, a first control element, means driven by said first control element to interrupt the mechanical connection connecting said first cam to said needle-carrier, and a mechanical connection connecting the second of said cams to said actuating mechanism of said feeder and effecting modifications of the advancement stroke of said feeder.

2. A sewing machine as claimed in claim l and comprising a first control device actuated by said first control element and operable to modify and fix the lateral extent of the displacements of said needle-carrier perpendicular to the advancement displacements of said feeder.

3. A sewing machine including a main shaft, a needle-carrier, a driving mechanism driven by said main shaft and driving said needle-carrier anactuating mechanism driven by said main shaft, a controlling device for said actuating device operable to effect modifications of the stroke of said feeder so as to permit modifications of the extent of the advancement pitch of the cloth under the needle, a mechanism, driven by said main shaft and effecting displacements of said needle-carrier, perpendicular to the advancement displacements of said feeder, and comprising a camshaft driven by said main shaft, and two cams, the first controlling the lateral displacements of the needle, and the second the extent of the stroke of the feeder, said cams being removably mounted on said camshaft, said cams being independent one from the other interchangeable and permutable, a mechanical connection connecting the first of said cams to said needle-carrier and effecting lateral displacements of said latter perpendicular to the advancement displacements of said feeder, a mechanical connection connecting the second of said camsy to said actuating mechanism of said feeder and effecting modifications of the advancement stroke of said feeder, a second control element, and means driven by said second control element to interrupt said mechanical connection 'connecting said second cam to said actuating mechanism of said feeder.

4. A sewing machine as claimed in claim 3 and comprising a second control device actuatedu by said second control element and operable to modify and fix the extent and the direction of the advancement displacements of said feeder.

5. A sewing machine as claimed in claim l and comprising a first control device actuated by said first control element and operable to modify and x the lateral extent of the displacements of said needle-carrier perpendicular to the advancement displacements of said feeder, an adjusting element and an adjusting device connecting said adjusting element to said needle-carrier and operable to modify and fix the lateral position of said needle-carrier.

5. A sewing machine as claimed in claim 3 and comprising a, second control device actuated by said second control element and operable `to modify and fix the extent and the directionfof the advancement vdisplacements of said feeder,- and two adjustable stops disposed on one and the other side of said second control element, said controlelementbeing Ydisplaceable between said two adjustable stops. s

7. A sewing machine as claimed in claim 1 and comprising a first control `device actuated by said first control element and operable to modify and fix the lateral extent of the displacements of said needle-carrier perpendicularto the advancement displacements of said feeder, an adjusting element and an adjusting device connecting said adjusting element to said needle-carrier and operable to modify and fix the lateral position of said needle-carrier, an axle parallel with said needle-carrier, a support rocking on said axle, and guides in said rocking support, said needle-carrier sliding in said guides.

8. A sewing machine as claimed in claim l and comprising a first control device actuated by said first control element and operable to modify and fix the lateral extent of the displacements of said needle-carrier perpendicular to the advancement displacements of said feeder, an adjusting element and an adjusting device connecting said adjusting element to Vsaid needle-carrier and operable to modify Vand fixrthe lateral position of in a vertical reciprocating movement, a feeder,

said needle-carrier, an axle parallel ywith said needle-carrier, a, support rocking on said axle, guides in said rocking support, said needlecarrier sliding in said guides, a finger, a spring acting on said finger, a mechanical connection connecting said rocking support to said first control element, and a lever driven in a rocking movement by said first cam, said rocking lever having a seating surface thereon, said spring maintaining said finger in contact with said seating surface, whereby said rocking support is driven in a to and fro movement by said first cam.

9. A sewing machine as claimed in' claim l and comprising a first control device actuated by said first control element and operable to modify and iix the lateral extent of the displacements of said needle-carrier perpendicular to the advancement displacements of said feeder, an adjusting element and an adjusting device connecting said adjusting element to said needlecarrier and operable to modify and fix the lateral position of Ysaid needle-carrier,` an axle parallel with said needle-carrier, a support rocking on cam, and an extension of said seating surfacer extending on the side of said hinge opposed to that of said prong, whereby the push of said finger acting on said extension effects the disengagement of said prong with said first cam.

10. A sewing machine as claimed in claim l and comprising a first control device actuated by said first control element and operable to modify and fix the lateral extent of thedisplace-V ments ofV said needle-'carrier perpendicular to the advancement.displacements of said feeder, an adjusting element and an adjusting device connecting said adjustingelement to said needlecarrier and operable to modify and fix the lateral.

position of said needle-carrier, an axle parallel with said needle-carrier, a support rocking on rsaid axle, guides in saidrocking support, saidy needle-carrier sliding insaid guides, a finger, a spring acting on said finger and a mechanical connection connecting said rocking support to said first control element, a lever driven in a rocking movement by said first cam, a seating surface on said rocking lever, said spring maintaining said nger in contact with said seating surface, whereby said rocking support is driven in a to and'fro movement by said first cam, a hinge for said rocking lever, a prong of said rocking lever cooperating with said iirst cam, and an extension of said seating surface extending on the side of said hinge opposed to that of said prong, whereby the push of said finger actingv on said extension effects the disengagement of said prong with said first cam, a fixed axle, a lever hinged on said axle, one arm of said lever bearing the hinge axle of said rocking lever, a finger carried by a second arm of said lever hinged on said fixed axle, said adjusting element having a groove in the form of a spiral, said finger being in engagement with said groove.

11. A sewing machine as ,claimed in claim 3V modify and iix the extent and the direction ofA the advancement displacements of said feeder',

two adjustable stops disposed on oney and the other side of said second control element, said control element being displaceable between said two adjustable stops, an adjustable guide controlled by said second cam or said second control element, and an actuating element of said actuating mechanism of said feeder, a part of said actuating element being in engagement with said adjustable guide.

12. A sewing machine as claimed in claim 3 and comprising a second control device actuated by said second control element and operable to modify and fix the extent and the direction of the advancement displacements of said feeder, two adjustable stops disposed on one and the other side of said second control element, said control element being displaceable between said two adjustable stops, a control shaft, an adjustable guide comprising a groove made in a part fastened to said control shaft, a seating element fastened to said control shaft, an actuating member driven by said second cam, a spring tending to keep said seating element in engage-- ment with said actuating member, and an actuating element of said actuating mechanism of said feeder, a part of said actuating element being in engagement with said groove of said adjustable guide, whereby said second cam controls the advancement displacement of said feeder.

13. A sewing machine including a main shaft, a needle-carrier, a driving mechanism driven by said main shaft and driving said needle-carrier in a vertical reciprocating movement, a feeder, an actuating mechanism driven by said main shaft, a controlling device for said actuating device operable to effect modifications of the stroke of said feeder so as to permit modifications of the extent of the advancement pitch of the cloth under the needle, a mechanism driven by said main shaft and effecting displacements of said needle-carrier perpendicular to the advancement displacements of said feeder and comprising a camshaft driven by said main shaft, and two cams, the First controlling the lateral displacements of the needle and the second the extent of the stroke of the feeder, said cams being removably mounted on said camshaft, said cams being independent one from the other, interchangeable and perinutable, a mechanical connection connecting the first of said cams to said needlecarrier and effecting lateral displacements of said latter perpendicular to the advancement displacements of said feeder, a mechanical connection connecting the second of said cams to said actuating mechanism of said feeder and effecting modications of the advancement stroke of said feeder, a second control element and means driven by said second control element to interrupt said mechanical connection connecting said second cam to said actuating mechanism of said feeder and comprising a second control device actuated by said second control element and operable to modify and fix the extent and the direction of the advancement displacements of said feeder, two adjustable stops disposed on one and the other side of said second control element, said control element being displaceable between said two adjustable stops, a control shaft, an adjustable guide comprising a groove made in a part fastened to said control shaft, a seating element fastened to said control shaft, an actuating member driven by said second cam, a spring tending to keep said seating element in engagement with said actuating member, an actuating element of said actuating mechanism of said feeder, a part of said actuating element being in engagement with said groove of said adjustable guide, whereby said second cam controls the advancement displacement of said feeder, a rst seating element fastened to said control shaft and acting in conjunction with a first actuating member fastened to said second control element, a second seating element of said control shaft acting in conjunction with said second actuating member mechanically connected to a member acting in conjunction with the second of said cams.

14. A sewing machine as claimed in claim 13 in which said second control element includes three arms, the first one emerging from the casing of the machine through a port, the second one carrying said first actuating member acting in conjunction with said first seating element of said control shaft for the manual operation of said latter, and the third one carrying a mobile stop intended to act in conjunction with a third actuating member in order to establish a mechanical connection linking the second of said cams to said second seating element of said control shaft for the automatic operation of said latter.

l5. A sewing machine as claimed in claim 13 in which said second control element includes three arms, the first one emerging from the casing of the machine through a port, the second one carrying said first actuating member acting in conjunction with said first seating element of said control shaft for the manual operation of said latter, and the third one carrying a mobile stop intended to act in conjunction with a third actuating member in order to establish a rnechanical connection linking the second of said cams to said second seating element of control shaft for the automatic operation of said latter, a lever having an arm cooperating with said second cam, and another arm carrying said second actuating member cooperating with said second seating element under the action of said spring acting on said control shaft, said lever pivoting on an arm carrying said third, actuating member and hinged on a fixed part, a spring acting on said lever and tending to keep it out of reach from the profile of said second cam.

i6. A sewing machine'as claimed in claim 3 and comprising a second control device actuated by said second control element and operable to modify and fix the extent and the direction of the advancement displacement-s of said feeder, two adjustable stops disposed on one and the other side of said second control element, said control element being displaceable between said two adjustable stops, said adjustable stops consisting each of an arm having a notch engaged on a fixed cylindric portion and carrying said second control element, and a lock cooperating under the action of a spring with openings made in the casing of the machine.

17. A sewing machine for zig-zag stitching including a main shaft, a needle-carrier, a driving mechanism driven by said main shaft and driving said needle-carrier in a vertical reciprocating movement, a feeder, an actuating mechanism driven by said main shaft, a controlling device for said actuating device operable to effect modifications of the stroke of said feeder so as to permit modifications of the extent of the advancement pitch of the cloth under the needle, a mechanism driven by said main shaft and causing displacements of said needle-carrier perpendicular to the advancement displacements of said feeder and comprising a camshaft driven by said main shaft and having two similar cam receivingr portions, and two cams independent one from the other, the first controlling the lateral displacements of the needle and the second the extent of the stroke of the feeder, identical means on each cam for removably mounting and fixing the same on either of the cam receiving portions of the cam shaft rendering the cams interchangeable and permutable, so that the one .can be replaced by the other or both may be replaced by other cams.

18. A sewing machine including a main shaft, a needle-carrier, a driving mechanism driven by said main shaft and driving said needle carrier in a vertical reciprocating movement, a

feeder, an actuating mechanism driven by said( main shaft, a controlling device for said actuating device operable to effect modifications of the stroke of said feeder so as to permit modifications of the extent of the advancement pitch of the cloth under the needle, a mechanism driven by said main shaft and effecting displacements of said needle-carrier perpendicular to the advancement displacements of said feeder, and comprising a camshaft driven by said mainshaft, and twocams, the rst controlling the lateral displacements of the needle and the second the extent of the stroke of the feeder, said cam being removably mounted onsaid camshaft, said cams being independent one from the other, and interchangeable, a mechanical connection connecting the rst of said cams t'o said needle-carrier and effecting lateral displacements of said latter perpendicular to the advancement displacements of said feeder, a first control element and means driven by said first control element to interrupt the mechanical connection connecting said rst cam to said needle-carrier, a mechanical connection connecting the second of said Ycams to said actuating mechanism of said feeder and effecting( modifications of the advancement stroke of said feeder, a second 'control element and means driven by said second control element to interrupt said mechanical Y connection connecting said second cam'to said actuating mechanism of said feeder.

19. A sewing machine as claimed in claim 17, in which the two cams and all parts of the mechanism cooperating therewith are mounted in the casing of the machine.

20. A sewing machine for zig-zag stitching comprising means for imparting reciprocating movements to the needle, means including a single cam and a cam'follower converting rotary motion into reciprocatory motion, a transmission mechanism for transmitting reciprocatory motion of the cam follower to the needle to effect transverse movements thereof and manually actuated means in said transmission mechanism operable for varying the ratio be- 14 tween the movements of said cam follower and the amplitude transverse movements of the needle, and operable for engaging and disengaging the cam follower with the cam.

21. A sewing machine according to claim 1 including also means enabling, during sewing, the

amplitude and the direction of the feed movements of the feed-dog to be varied by means cf a second manual controlling member, and mechanically by means of a mechanism capable of being engaged and disengaged at will for varying the character of the zig-zag stitching.

22. A sewing machine for zig-zag stitching comprising means for imparting reciprocating movements to the needle, means including a single cam and a cam follower converting rotary motion into reciprocatory motion, a link for imparting transverse movements to the needle, a pivoted lever carrying the cam follower and engaging one end of the link, and manually actuated means for shifting the position of engagement of the link and lever toward and away from one side of the pivot of the lever to vary the amplitude of the transverse movement of the needle and to the other side of the pivot of the lever to move the cam follower out of contact with the cam, said manually actuated means being also operable to shift the position of contact of the link and lever from said other side of the pivot wherein the cam follower is out of contact with the cam to the first mentioned side of the pivot to bring the cam follower into contact with the cam.

23. A sewing machine for zig-Zag stitching comprising a feed dog, means for imparting feed movement to the feed dog, control means varying the amplitude and the direction of the feed movements of the feed-dog during sewing, means including a cam and cam follower for mechanically and automaticaly imparting movements to the control means to mechanically and automatically vary the amplitude and direction of the feed movements of the feed dog during sewing, a manually actuated member engageable with the control means for actuating the control References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,250,511 Rogers Dec. 18, 1917 V1,338,074 Eames et al. Apr. 27, 1920 1,611,372 Rader Dec. 21, 1926 2,114,075 Gellman Apr. 12, 1 938 2,121,884 Prazakl June 28, 1938