US3296988A - Zigzag sewing machine - Google Patents

Description

1967 JUJI YAMAGIWA ZIGZAG SEWING MACHINE 7 Sheets-Sheet 1 Filed May 21, 1959 Jan. 10, 1967 JUJI YAMAGIWA ZIGZAG SEWING MACHINE 7 SheetsSheet 2 Filed May 21, 1959 Jan, 10, 1967 JUJI YAMAGIWA 3,296,988

ZIGZAG SEWING MACHINE Filed May 21L, 1959 '7 Sheets-Sheet 3 Jim 1967 JUJI YAMAGIWA ZIGZAG SEWING MACHINE Filed May 21, 1959 7 Sheets-Sheet E1 Jan. 10, 1967 JUJI YAMAGIWA ZIGZAG SEWING MACHINE 7 SheetsSheet 6 Filed May 21. 1959 1967 JUJl YAMAGIWA 3,296,988

ZIGZAG SEWING MACHINE Filed May 21, 1959 '7 Sheets-Sheet 7 United States Patent 3,296,938 ZIGZAG SEWING MACHINE Juji Yamagiwa, Kawachinaganoshi, Japan, assignor to Fukuske Kabushiki Kaisha, Osaka, Japan, a corporation of Japan Filed May 21, 1959, Ser. No. 814,839 Claims priority, application Japan, Nov. 17, 1958, 33/ 33,174 6 Claims. (Cl. 112-158) The present invention relates to improvements in a zigzag sewing machine and more particularly to a sewing machine for domestic use having improved means for making buttonholes.

A main object of the present invention is to provide an improved zigzag sewing machine of simple and useful construction, comprising a cam disc for a buttonhole seam removably mounted on a cam shaft in an arm, two kinds of cams for the buttonhole seam fixed on the cam shaft and a feed reversing device for producing a buttonhole seam of any pitch and width.

Another object of the present invention is to provide an improved domestic zigzag sewing machine of simple and useful construction wherein a cam engaging head urged by a cam follower is shifted to one of a set of buttonhole seam sewing cams mounted on a cam shaft in an arm by only up and down motion of a lever in front of the arm, whereby reversal of the sewing direction can be effected while the cam engaging head is not separated radially from the cams but slides smoothly on the cams.

Anotherobject of the present invention is to provide an improved zigzag sewing machine of simple and useful construction wherein various kinds of ornamental zigzag sewing can be effected by interchanging suitable cam discs on a cam shaft while simple standard zigzag sewing also can be effected by engaging a buttonhole seam sewing cam which is fixed on the cam shaft.

Still another object of the present invention is to provide a zigzag sewing machine which includes a device for separating the cam follower from a cam so that the needle is not subjected to the actions of the above mentioned cams and straight sewing is ensured.

Other objects and advantages of the present invention will be apparent from the following description of a preferred embodiment thereof, making reference to the accompanying drawings, in which:

FIGURE 1 shows an elevation view of the sewing machine according to the present invention, in which the front wall of the arm is partly broken away and the top cover is omitted.

. FIGURE 2 is a top view of the sewing machine shown in FIGURE 1, with the top cover omitted.

FIGURE 3 is a sectional plan view of a cam supporting member and a cam disc.

FIGURE 4 is a sectional side elevation view of a detail of the sewing machine, the cam engaging head being located on the intermediate position.

FIGURE 5 is a similar view to FIGURE 4, with the cam engaging head being located in a forward position.

FIGURE 6 is a perspective view of a lever with a cam engaging head and a lever sleeve.

FIGURES 7 and 8 are a plan view and a front elevation view of a mounting plate.

FIGURE 9 shows an elevation view of a needle bar oscillating machanism set at the maximum width.

FIGURE 10 is a similar view to FIGURE 9, with the needle bar oscillating width being set at zero for straight sewing.

FIGURE 11 is a similar view to FIGURE 4, with the cam engaging head being located in the backward position.

3,296,988 Patented Jan. 10, 1967 FIGURE 12 is a side elevation view of a feed regulating element in the position of FIGURE 11.

FIGURE 13 is a perspective view of a T-shaped lever and an attached lever.

FIGURE 14 is a perspective view of a handle assembly.

FIGURE 15 is an elevation view of an operating cam indicating plate.

FIGURES 16 and 17 are perspective views showing the relation of the T-shaped lever and the attached lever.

FIGURE 18 shows a buttonhole seam of a standard zigzag pattern.

FIGURE 19 is a perspective view of a spring plate.

Referring now to FIGURES l and 2,. the reference numeral 1 designates an overhanging arm integral with a frame post of a sewing machine. An upper shaft 2 of V the machine is supported in said arm 1, said shaft being drivable by conventional driving means (not shown). The drive is transmitted by conventional means to a needle bar (not shown) so as to impart thereto a reciprocating up and down motion. A worm 3 fixed on said shaft 2 meshes with a worm wheel 4 fixed on a cam shaft 13 which is supported by two arms 11 and 12 of a cam supporting member 10, said member being swingably supported on a shaft 9 which is journalled in bosses 7 and 8 formed on front and rear walls 5 and 6 within said arm 1 and is fixed to said bosses by screws. The meshing of said worm 3 and said worm wheel 4 is set by means of fixing screws 14- and 15 (shown in FIG. 3).

A fixed cam disc 18, for sewing buttonhole seams, is provided with different shape cam portions 16 and 17, and is supported on the front end of the ream shaft 13 as shown in FIGURE 3. Said cam disc 18 carries at its front part a pin 19 for locating an interchangeable cam 22 and is formed with a cylindrical portion 21 on which one of the interchangeable cams is mounted and within which a cam lock spring 20 is provided, said cam 22 being easily interchangeable through an opening 23 in the front wall 5 of the arm 1. In FIGURE 4, the numeral 24 indicates a guide shaft parallel to the cam shaft 13, the front end of which is inserted into a boss 25 formed on the front wall 5 within the arm 1 and is fixed by a screw, and the rear end of which is inserted into a boss 27 fixed in a boss 26 formed on the rear wall 6. Slidably mounted on said guide shaft 24 is a lever sleeve 28 which has a vertical groove 29 adjacent to its rear end and a lever 30 on its front side as shown in FIGURE 6, said lever extending upwardly and being provided at its top end with a cam engaging head 31 which contacts the curved periphery of the cam disc. The position of a. cam follower 32 is such that its lower end 33 contacts with the surface 34 opposite to the head 31 of the lever 30. The cam follower 32 is fixed on the front end of a stub shaft 39 fitted in an axial bore 38 at the right side of a mounting plate 37 shown in FIGURES 7 and 8, said plate being fixed by means of screws 36 on upper seats 35 of the arm 1. On the rear end of said stub shaft 39 is fixed a width controlling guide member 40, on the upper end face of which is bolted a rocking plate 41.

A tension spring 44 extends between an angle lever 42 at the right end of said rocking plate and a stud bolt 43 on said mounting plate 37. Consequently, since said member 40 always tends to be turned counterclockwise about the stub shaft 39, the cam follower 32 fixed thereon will press, at the lower end 33, the cam engaging head 31 so as to contact it with the peripheral cam surface of the cam disc 22. Thus by rotation of the cam disc 22 the cam engaging head 31, the cam follower 32, and the member 40 are oscillated about the stub shaft 39, and on all such occasions the tension spring 44 is expanded or contracted. A bolt 45 is adjustably mounted on the rocking plate 41 in order to prevent the unnecessary rotation of said member 40.

The width controlling guide member 40 is of known construction, said member being on both ends at the rear side provided with two side walls 46 forming a guide groove 47 within which a slide block 48 is fitted slidably upward and downward, and in a center bore 49 of the slide block 48 a pin 51 is fitted loosely and mounted at upper end of a needle bar oscillating lever 51).

Loosely fitted in another axial bore 52 of said mounting plate 37 is a zigzag width controlling lever shaft 53, at the rear end of which a lever 54 is fixed. A link 55 is pivotally connected at its upper end to said lever 54 and at its lower end to said lever 51) by means of a pin 56. Thus the oscillatory motion of the width controlling guide member 40 produced by the rotation of the cam disc 22 is transmitted to the needle bar oscillating lever 50 carried by the link 55 and the lever 54 described above, so that a right and left motion is imparted to a pin 57 at the left lower end of said lever 50 and thereby an oscillatory motion is given to a needle bar guide member 58 pivoted at a pin 58. Thus it is possible to produce zigzag seams.

The width adjusting operation will be now described.

As shown in FIGURE 2, fixed to the end of the said lever shaft 53 projecting outwardly from the front wall of the arm 1 is a width change lever 68. When said lever 60 is turned to the left as shown in FIGURE 9, the lever 54 on said lever shaft 53 is situated at the lowermost position, and thereby the needle bar oscillating lever 50 is also brought to its lowermost position, so that the oscillatory motion of the width controlling guide member 40 by the rotation of the cam disc 22 is transmitted to the largest extent to the needle bar oscillating lever 50 by the slide block 48, and therby the oscillating width of the needle will be maximum. In this case, it is unnecessary to lower excessively the position of the slide block 48 or the needle bar oscillating lever 50. An excessive clockwise rotation of the width change lever 60 is limited by contacting the lower end of an adjustable screw 62 with an inclined surface 63, said screw being provided on a bracket 61 fixed on said lever shaft 53, and said surface 63 at the front side of the mounting plate 37.

, Then, when the width change lever 68 is gradually turned counterclockwise, the lever 54 is raised, thereby the needle bar oscillating lever 50 is also lifted, then the slide block 48 is shifted upward to the stub shaft 39, and thus the oscillating width of said lever 50 oscillated by said member 40 becomes small. When the width change lever 60 is situated to bring its oscillating width to zero as shown in FIG. 10, the slide block 48 reaches its uppermost position, so that the oscillation movement of said member 40 will not impart any motion to the needle bar. However, if the cam engaging head 31 and the cam follower 32 are maintained in contact with the peripheral cam surface of the cam disc 22 straight sewing becomes unstable. In order to avoid this defect the sewing machine according to the present invention is provided with the following mechanism. Just before the width change lever 60 is turned to the position causing the oscillating width to be zero, a pushing-up lever 64 fixed on said lever shaft 53 touches the bottom surface of the rocking plate 41 and then turns to push it up. Consequently, the width controlling guide member 40 and the cam follower 32 turn clockwise against the force of the tension spring 44, and thus the cam engaging head 31 pressed by the cam follower 32 against the cam disc 22 is detached from the cam disc 22 under the force of a tension spring 66 extending between the lever 30 and a stud bolt 65 on the arm 1. Accordingly, the cam disc 22 has no relation to the abovementioned zigzag driving mechanism and the width controlling mechanism, and stable straight sewing is effected surely. The above-mentioned operation is also carried out when the cam disc 22 is removed for interchanging. A pushing plate 67 and a pushing screw 68 are adapted to brake the rotation of said lever shaft 53 to prevent the oscillation of said member 40 from affecting upon the stability of said lever shaft 53.

The changing mechanism for the cam engaging head 31 which mechanism comprises two fixed cams 16 and 17 and an interchangeable cam disc 22 for buttonhole seam sewing, will be hereinafter described. As shown in FIG- URE 1, a T-shaped lever supporting boss 69 projects inwardly within the arm 1 into which boss a pivot pin 74 is inserted and fixed, said pin being fitted loosely to a center bore 71 of an attached lever 70 constructed as shown in FIGURE 13 and a center bore 73 of a T-shaped lever 72. In this case a projecting pin 75, provided at the upper portion of the attached lever 70, is engaged with the vertical groove 29 of the lever sleeve 28. As shown in FIGURES 13 and 14, the T-shaped lever 72 is so constructed that the same shaped blades 76 and 77 as those of the attaching lever '70 are provided at the rear end of said lever, a handle 78 is fixed at the front end of said lever, a depending portion 79 extends downwardly and a horizontal portion 80 is bent at the lower end of depending portion 79.

A steel wire spring 81 is wound around said pin 74 and urges together at the lower end 82 and the upper end 83 the front side of the superimposed attached lever 70 and the blades 76 and 77 of the T-shaped lever 72. Thus if the handle 78 is shifted upward or downward, the T- shaped lever 72 is turned about the pivot pin 74 and thereby the attached lever 70 is also turned by the lower or upper ends of the spring 81 so that the lever sleeve 28 with the vertical groove 29 which cooperates with the projecting pin 75 is shifted forward and backward on the guide shaft 24. Then the cam engaging head 31 on the upper end of the lever is shifted on the peripheries of the above-mentioned three cams so as to obtain the action of the desired cam. In the forward position as shown in FIGURE 5, the cam engaging head 31 engages with the interchangeable cam disc 22 for sewing the buttonhole seam. FIGURES 4 and 11 show the intermediate position and the backward position respectively.

In order to hold the cam engaging head 31 at an accurate position on each cam, an operating cam indicating plate 84 as shown in FIGURE 15 is provided on the front surface of the front wall 5, the handle 78 attached to the T-shaped lever 72 being projected through the vertical groove 85 and fitting with either of the handle engaging grooves 86, 87 and 88 at three positions.

When the cam engaging head 31 is slidably shifted to the adjacent cam, shifting resistance arises because of the different heights and shapes of the cams. However, regardless of such resistance, the operation of the handle 78 of the T-shaped lever 72 can be effected by the user at any time. It is undesirable that the user feels such resistance. The steel wire spring 81 acts as a buffer which permits a time lag between the operation of the handle 78 and the shifting of the cam engaging head 31. FIGURE 16 shows a delayed shifting position of the pin 75 by lowering the handle 78, while FIGURE 17 shows an unshifting position of the pin 75 by raising the handle 78. In either case, shifting of the pin 75 is delayed for a short time during which the cam rotates and permits the cam engaging head 31 to shift slidabiy. Thus, when the resistance is reduced, the pin 75 is moved under the force of the spring 81 at the lower end 82 or the upper end 83 and thereby the cam engaging head 31 can be slid and shifted smoothly on the cam.

Now the operation of the buttonhole seam sewing and the action of the mechanism for said sewing will be described. In FIGURE 18, there is illustrated a standard pattern of a buttonhole seam designated by the numeral 89, which pattern may be produced by the standard Zigzag cam 17 in front of the fixed cam disc 18. That is to say, the handle 78 is inserted into the engaging groove 87 of the operating cam indicating plate 84 as shown in FIGURE 4 and the cam engaging head 31 is engaged with the cam 17 so that zigzag seam in the standard width is produced by the needle bar oscillation transmitting mechanism. Then in order to produce the small width seam 90 on the left side of the buttonhole 91, the handle '78 is inserted into the engaging groove 88 as shown in FIGURE 5 and the cam engaginghead 31 is engaged with the interchangeable cam 22 for the button hole sewing. The shape of said cam 22 is so formed that oscillation becomes about half on the left side of the buttonhole. Then in order to produce the seam 92, the handle 78 is again inserted into the engaging groove 87 and the cam 17 may be employed. Then in order to produce the small width seam 93 on the right side of the buttonhole 91, the cam 16 for buttonhole sewing may be employed as shown in FIGURE 11. The handle 78 is lifted and inserted into the engaging groove 86 so that the cam engaging head 31 acts on said cam 16. In this case since the feed direction must be reversed, a feed reversing mechanism is automatically operated by the lifting mo tion of the handle 78. That is to say, a member 94 for supporting a feed regulating element is provided in the arm 1, projecting forward from the rear wall 6 as shown in FIGURES 1, 2 and 12. A feed regulating element 95 of conventional means is rotatably attached to said member by a pin 96. A spring plate 97 shown in FIG- URE 19 is provided on the bottom of this feed regulating element 95, and the front end 98 of said spring plate 97 extends leftward as shown in FIGURES 1 and 2 so as to be located on the horizontal portion 80 of the T-shaped lever 72. When the handle 78 is lifted, the front end 98 of the spring plate 97 is simultaneously lifted by the horizontal portion 80 so that the feed regulating element 95 is turned and thereby the feed direction is reversed through a series of conventional transmitting means. A button 99 projecting toward the front wall 5 of the arm 1 permits the feed for the straight sewing to be reversed.

In order to sew all zigzag seams as well as the buttonhole seam at a desired pitch, the feed regulating element 95 is provided with pitch changing means (not shown). As a pitch controlling pin 100 is shifted forward or backward, an angle of inclination of the feed regulating element 95 is selected. In the sewing machine according to the invention, the lifted distance of the horizontal portion 80 of the T-shaped lever 72 is constant independently of an amount of the pitch 'or an angle of inclination of the feed regulating element 95 as mentioned above so that the resilient spring plate 97 is provided on said element 95 so as to turn at various angles of inclination therewith. That is to say, for example in case that an amount of the pitch and an angle of inclination of the feed regulating element 95 are small and the turning angle is also small, if the horizontal portion 80 of the T-shaped lever 72 is lifted at a certain distance, the tip portion 98 of the spring plate 97 is largely bent so that turning for reversing is possible at the desired pitch without any impediment.

An ornamental zigzag pattern can be produced by the sewing machine according to the invention. If the cam 17 for the button hole seam sewing is used, the standard zigzag pattern is produced. Furtherifthe interchange able cam disc 22 is removed from the cylindrical portion 21 and interchangeable cam disc attached to the sewing machine is mounted thereto, said cam disc being of various kinds, many ornamental zigzag patterns are produced.

A well-known fork-type device for controlling an oscillating width of a needle bar has a bad effect upon the tip of a needle due to motion of a fork in both cases wherein an oscillating width is nought and maximum, and is attended with power consumption and wear due to unnecessary friction. On the contrary, the sewing machine according to the present invention does not have a detrimental effect upon the tip of the needle because the cam engaging head which is pushed by the cam follower is detached from the cam when the width is nought. In the sewing machine of the present invention, its revolution is light, there are few portions to be worn and its control of the needle oscillating width is positively ef fected by a simple mechanism.

In the well-known domestic sewing machine it is difficult to sew the buttonhole seam automatically, but in the sewing machine according to the present invention it is possible to sew the buttonhole seam of any pitch and width automatically without requiring any special skill. Simply by handle operation only, various kinds of ornamental zigzag patterns may be produced by interchanging or substituting the interchangeable cam for an ornamental zigzag pattern cam attached to the sewing machine, and the straight sewing may be accomplished without any influence of the part of the. zigzag mechanism, so that this sewing machine is very convenient and useful as a domestic sewing machine.

What I claim is:

1. In a sewing machine, in combination, a buttonhole stitching device, comprising, in combination, cam follower means; mounting means for mounting cam follower means for oscillation about an axis and for movement between three positions; operating means for moving said cam follower means between said three positions; cam means having two first cam tracks and one second cam track respectively engageable with said cam follower means in said three positions of said cam follower means, each of said first cam tracks having a plurality of alternating projections and recesses for oscillating said cam follower means about two spaced centers of oscillations, respectively, and said second cam track having a plurality of alternating projections and recesses for oscillating said cam follower means about a center of oscillation located intermediate said centers of oscillations and at such an amplitude as to overlap the oscillations of said cam follower means under control of said first cam tracks; a needle bar assembly; means for connecting said cam follower means to said needle bar assembly so that the same is transversely oscillated under the control of said cam follower means, said needle bar assembly producing transverse stitches in transversely spaced positions when said cam follower means cooperate with said first cam tracks, and producing transverse stitches overlapping With the stitches produced under control of said first cam tracks when said cam follower means cooperates with said second cam track; feed reversing means for reversing the feeding direction in Which a material is fed to said needle bar assembly; and means for actuating said feed reversing means for effecting feeding in opposite directions only whensaid cam follower means is in the two positions, respectively, in which said cam follower means cooperates with said first cam tracks.

2. A zigzag sewing machine having means for automatically sewing buttonhole seams uniformly, comprising an arm, a swingable frame carried by said arm, a needle bar carried for endwise reciprocation in said frame, a rotary upper shaft mounted in said arm for reciprocating said needle bar, means for rotating said shaft, a cam shaft operatively associated with said upper shaft and driven thereby, a cam disc fixed on said cam shaft for rotation therewith and having different cam surfaces for sewing,

buttonhole seams of a narrow and a wide width, an interchangeable cam disc fixedly mounted on said cam shaft for sewing seams of a width corresponding to said narrow width seam in an opposite direction, a guide shaft parallel to said cam shaft carried by said arm, a lever including a lever sleeve portion having a groove at one end and a projecting lever portion at the other end including a cam engaging head adapted to engage the curved periphery of said cam discs, said cam engaging head engaging one of the cam surfaces of said cam disc to produce a zigzag seam of a narrow width and engaging the cam surface of said interchangeable cam disc to produce a zigzag seam of the same narrow width in an opposite direction, said lever sleeve portion being slidably mounted on said guide shaft, a stub shaft in spaced relation from said cam shaft, a cam follower fixed on said stub shaft and contacting said cam engaging head to normally urge the latte-r to engage the periphery of said cam discs, means for transmitting oscillatory motion from rotation of said cam discs to said swingable frame, a T-shaped lever carried within said arm having three operative positions to produce wide seams, forward and reverse narrow seams, a handle coupled to said T -shaped lever and extending outside the front wall of the machine to position said T-shaped lever in each of its three operative positions, an attached lever, spring means associated with and operatively coupling said attached lever to said T-shaped lever for movement in response to movement thereof, said attached lever having a projecting pin engageable with said groove at the one end of the lever sleeve portion, said attached lever effecting movement of said sleeve portion along said guide shaft to move said cam engaging head on the periphery of a selected one of said cam surfaces so as to obtain'the action of said cam surfaces in accordance with said operative positions of said T-shaped lever, and means for reversing the forward feed operatively coupled to said handle and rendered operative when said T-shaped lever is positioned to produce narrow reverse seams comprising a feed regulating element operatively associated with said arm and a flexible spring plate coupled to said feed regulating element and extending therefrom for engagement with said T-shaped lever, movement of said T-shaped lever to the reverse narrow seam operative position being effective to operate said feed regulating element for reversal of feed direction to produce narrow reverse seams of identical pitch to the forward narrow seams.

3. In a zigzag sewing machine having a cam disc and an interchangeable cam disc fixedly mounted on a cam shaft, the cam disc having different cam surfaces for sewing buttonhole seams of different widths, one ofsaid cam surfaces being effective to produce wide seams in a forward direction and the other of said cam surfaces being effective to produce narrow seams on one side of said buttonhole in a reverse direction, said interchangeable cam having a cam surface which is effective to produce narrow seams on the other side of the buttonhole in a forward direction, and a guide shaft parallel to the cam shaft, the improvement including movable means for cooperating with the fixedly mounted cams to selectively engage one of said cams, comprising a sleeve portion slidably engaged with the guide shaft and having a groove at one end and a projecting lever at the other end, a cam engaging head coupled to said projecting lever effective in response to movement of said sleeve portion to engage a selected one of said cam surfaces, a cam follower operatively associated with said cam engaging head to urge the latter into contact with said selected one of said cam surfaces, an attached lever having a projecting pin engageable with said groove to move said sleeve portion along the guide shaft to place said cam engaging head into contact with said selected cam surface, a T-shaped lever having a handle projecting therefrom movable to three predetermined positions to select one of the three cam surfaces, spring means associated with and operatively coupling said attached lever and said T-shaped lever together for moving said attached lever in response to movement of said T-shaped lever with a time lag therebetween to compensate for different shapes of said three cam surfaces and eliminate transfer of the resistance between said cam engaging head and said cam surfaces to said handle, and means for reversing the forward feed operatively coupled to said handle and rendered operative to produce seams in said reverse direction comprising a feed regulating element, a spring plate coupled to said feed regulating element and extending therefrom for engagement with said T-shaped lever and operative in response to the movement of the handle to the predetermined position to select the cam surface to produce seams in the reverse direction to reverse the direction of feed to produce seams in the reverse direction of pitch equal to that of the seams in the forward direction.

4. In a zigzag machine as claimed in claim 3, including a width control member, a rocking plate coupled to said Width control member being operatively coupled to oscillate together, means comprising a push up lever effective to engage said rocking plate to prevent engagement of said cam follower with said cam engaging head and to render said width control member inoperative to provide for stable straight sewing.

5. A zigzag sewing machine as claimed in claim 2 including a spring resiliently urging the cam follower against the cam engaging head and means for separating the cam engaging head from said cam surfaces.

6. A zigzag machine as claimed in claim 3 comprising means connected to said feed regulating element for pivoting the same to select a desired pitch, said spring plate being flexible so that movement of the T-shaped lever to produce seams in the reverse direction causes reversal of the direction of feed while maintaining the selected pitch.

References Cited by the Examiner UNITED STATES PATENTS 1,033,721 7/1912 Miller 112-158 2,905,119 9/1959 Bono 112158 2,906,219 9/1959 Vigorelli 112158 2,966,869 1/1961 Fischer 12-153 FOREIGN PATENTS 1,143,023 4/1957 France.

756,403 9/ 1956 Great Britain.

518,288 3/1955 Italy.

543,731 5/1956 Italy.

573,162 2/1958 Italy.

307,936 9/ 1955 Switzerland.

JORDAN FRANKLIN, Primary Examiner.

THOMAS J. HICKEY, DAVID J. WILLIAMOWSKY,

Examiners.

R. V. SLOAN, RICHARD J. SCANLAN, JR., H. D. COOPER, G. A. MYSLIWIEC, Assistant Examiners.

Claims (1)

1. IN A SEWING MACHINE, IN COMBINATION, A BUTTONHOLE STITCHING DEVICE, COMPRISING, IN COMBINATION, CAM FOLLOWER MEANS; MOUNTING MEANS FOR MOUNTING CAM FOLLOWER MEANS FOR OSCILLATION ABOUT AN AXIS AND FOR MOVEMENT BETWEEN THREE POSITIONS; OPERATING MEANS FOR MOVING SAID CAM FOLLOWER MEANS BETWEEN SAID THREE POSITIONS; CAM MEANS HAVING TWO FIRST CAM TRACKS AND ONE SECOND CAM TRACK RESPECTIVELY ENGAGEABLE WITH SAID CAM FOLLOWER MEANS IN SAID THREE POSITIONS OF SAID CAM FOLLOWER MEANS, EACH OF SAID FIRST CAM TRACKS HAVING A PLURALITY OF ALTERNATING PROJECTIONS AND RECESSES FOR OSCILLATING SAID CAM FOLLOWER MEANS ABOUT TWO SPACED CENTERS OF OSCILLATIONS, RESPECTIVELY, AND SAID SECOND CAM TRACK HAVING A PLURALITY OF ALTERNATING PROJECTIONS AND RECESSES FOR OSCILLATING SAID CAM FOLLOWER MEANS ABOUT A CENTER OF OSCILLATION LOCATED INTERMEDIATE SAID CENTERS OF OSCILLATIONS AND AT SUCH AN AMPLITUDE AS TO OVERLAP THE OSCILLATIONS OF SAID CAM FOLLOWER MEANS UNDER CONTROL OF SAID FIRST CAM TRACKS; A NEEDLE BAR ASSEMBLY; MEANS FOR CONNECTING SAID CAM FOLLOWER MEANS TO SAID NEEDLE BAR ASSEMBLY SO THAT THE SAME IS TRANSVERSELY OSCILLATED UNDER THE CONTROL OF SAID CAM FOLLOWER MEANS, SAID NEEDLE BAR ASSEMBLY PRODUCING TRANSVERSE STITCHES IN TRANSVERSELY SPACED POSITIONS WHEN SAID CAM FOLLOWER MEANS COOPERATE WITH SAID FIRST CAM TRACKS, AND PRODUCING TRANSVERSE STITCHES OVERLAPPING WITH THE STITCHES PRODUCED UNDER CONTROL OF SAID FIRST CAM TRACKS WHEN SAID CAM FOLLOWER MEANS COOPERATES WITH SAID SECOND CAM TRACK; FEED REVERSING MEANS FOR REVERSING THE FEEDING DIRECTION IN WHICH A MATERIAL IS FED TO SAID NEEDLE BAR ASSEMBLY; AND MEANS FOR ACTUATING SAID FEED REVERSING MEANS FOR EFFECTING FEEDING IN OPPOSITE DIRECTIONS ONLY WHEN SAID CAM FOLLOWER MEANS IS IN THE TWO POSITIONS, RESPECTIVELY, IN WHICH SAID CAM FOLLOWER MEANS COOPERATES WITH SAID FIRST CAM TRACKS.

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