US1726153A

US1726153A - Buttonhole-sewing machine

Info

Publication number: US1726153A
Application number: US211079A
Authority: US
Inventors: Kiewicz John
Original assignee: Reece Button Hole Machine Co
Current assignee: Reece Button Hole Machine Co
Priority date: 1927-08-06
Filing date: 1927-08-06
Publication date: 1929-08-27
Anticipated expiration: 1946-08-27

Description

Aug. 27, 1929. J. KIEWICZ BUTTONHOLE SEWING MACHINE 4 Shets-Sheet I filed Aug. 6, 1927 lnvenToT. John Kiewic byfmdw Aug. 27, 1929. J. KlEWlCZ BUTTONHOLE SEWING MACHINE Filed Aug. 6. 1927 4 Sheets-Sheet AITys.

\nvenToT. John K ew' byw oh mm Au 27, v K Ew z 1,726,153 I BUTTONHOLE SEWING MACHINE Filed Aug. 6, i927 4 Sheets-Sheet 5 II" V,

mg h {@43 mass 7 l nverflo r. John Kiewicg byMMJM ATTyS.

Aug. 27; 1929.: w z 1,726,153

{BUTTON-IDLE SEWING MACHINE Filed Aug. 6. 1927 =1 Sheets-Sheet 4 i \nv'fiTon,

'Uohn Kie'wicg v An a;

Patented Aug. 27, 1929.

UNITED STATES PATENT OFFICE.

JOHN KIEWICZ, BOSTON,MASSACHUSETTS, ASSIGNOR TO THE REECE BUTTONHOLE MACHIN E COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

BUTTON HOLE-SEWING MACHINE.

- Application filed August 6, 1927. Serial No. 211,079.

This invention relates to buttonhole sewing machines of the type adapted to sew a buttonhole with an eye at one end and with a bar at the other end which extends in the direction of the length of the buttonhole.

One of the objects of the present invention is to provide a buttonhole sewing machine of this type which is so constructed that buttonholes of varying length and with or without an eye can be sewed.

It has heretofore been proposed to provide sewing machines of this type with means whereby the buttonhole may besewed either with or without an eye, and it has also been proposed to provide sewing machines of this type with means whereby the length of the buttonhole and the length of the bar may be varied.

In my present invention I have combined these two features and have produced-a sewing machine by which buttonholes of vary ing lengths and with varying lengths of bar and with or without an eye, can be sewed.

In order to give an understanding of my invention, I have illustrated in the drawings a selected embodiment thereof, which will now be described, after which the novel features thereof will be pointed out in the appended claims.

In the drawings Fig. 1 is aside view of a buttonhole sewing machine'embodying my invention with parts broken out. I

Fig. 2 is a bottom plan view of the bed and the frame carrying the stitch-forming mechanism. V

Fig. 3 is a fragmentary sectional view illustrating the barring cam and parts associ- -.ated therewith.

1*: igs. land. 5 are sections on the line 44 Fig. 2 illustrating the parts in different position.

Fig. 6 is a section on the line 6-6 Fig. 4.

Figs. 7 8, 9 and 10 illustrate different types of buttonholes which may be made with the machine herein illustrated.

Fig. 11 is a view showing the means emloyed for adjusting the machine. for bars 0 different lengths. v Fig. 12 is a section on the line 1212 Fig. 2. ig. 13 is an underside view of the main cam.

Fig. 14 is a top view of the main cam on a reduced scale. I

Fig. 15 is an enlarged section on line 15-15 Fig. 2.

I have illustrated the invention as it might be embodied in a sewing machine such as is shown in my co-pend-ing application Serial N 0. 189,792 filed May 9, 1927.

Before describing the machine indetail, I will refer to Figs. 7 to 10 which illustrate different types of buttonholes that can be sewed on the machine.

. Fig. 7 shows the usual buttonhole with the eye at one end and with a bar at the other end extending in the'direction of the length ,4

of the buttonhole.

Fig. 8 shows a similar buttonhole, but 7 hole has the bar 6 which is in the line of the slit 1 and extends in the direction of the length of the buttonhole. This bar is formed by shifting the stitch-forming mechanism and work-holding means laterally with reference to each'otherwhen the sewing reaches the end of the slit, so that the two lines of stitching are superposed upon each other to make the bar 6. The eye of the buttonhole is formed in the usual way by iving the workholding means and stitchorming mechanism a relative lateral vibrating movement while sewing around the end of the buttonhole.

The sewing machine herein illustrated is so constructed that if it is desired to sew a buttonhole with an eye, but without the bar; the stitching will not be started until after the stitch-forming mechanism and workholding means have been given their lateral movement to place the parts in relative position for stitching the sides of the buttonholes. If, on the other hand, a buttonhole without an eye is desired, then the means for giving the stitch-forming mechanism and workholding means their relative lateral vibrating movement While sewing around the buttonhole is rendered inoperative, with the result that a buttonhole of the types shown in Figs. 9 and 10 will be formed.

The work-holding means and stitch-forming mechanism of the machine herein illustrated are such as are commonly found in buttonhole sewing machines. The work holding means comprises the usual work clamps 7 which are pivotally mounted'on clamp plates 8 that are supported on the bed 9 of the machine. The stitch-forming mechanism comprises the usual needle 10 operating from above the'work and the usual under-thread handling mechanism, which is carried by a turret'll that is situated beneath the bed-plate 9. The stitch-forming mecha nism is carried by a head or frame 12 which is mounted on the bed-framc 9for to and fro movement, said frame 12 having a supporting portion 13 beneath the bed-plate 9 and in which the turret 11 is mounted. The work is thus clamped to the bed-plate 9 by the work clamps 7 and the frame 12 carrying'the stitchforming mechanism is adapted to move back and forth on the bed during the sewingof the buttonhole, all as shown in United States Patents No. 488,028, December 13, 1892, and No. 494,280, March 28, 1893. This movement of the frame is derived from the main cam 14 which is mounted in a cam casing 15 carried by the frame 12, said cam having'a feed groove 16 in its upper face, in which is received a stationary stud 17 depending from the bed 9. The rotation of the cam will move the frame 12 to and fro, all as described in the'iiboVe-mentioned patents.

In the operation of buttonhole sewing machines of this type, the machine is brought to rest at the end of a cycle of operations with the parts in buttonhole cutting position, and when the machine is set in operation the cam 14 is given an initial movement by a high speed driving mechanism during which the frame 12 is shifted from buttonhole cutting to stitching position, as shown by the full and dotted line positions of the needle in Fig. 1. WVhen the stitching position has been reached, the high speed driving mechanism is disconnected from the cam 14 and the shaft 18 which operates the stitch-forming mechanism is set in operation. The cam 14 is then rotated at a slower speed from the shaft 18 thereby giving the frame 12 the necessary movements to cause the stitching to be formed along the edges of the buttonhole, all as described in the above-mentioned patents.

During the sewing around the end of the buttonhole, the stitch-forming mechanism is turned about a vertical axis by mechanism similar to that shown in patent No. 655,637 dated August 7, 1900. This mechanism com- 10 and the turret 11.

is separate from the main cam 14 and in" carries two

pins

43 and 44 that are adapted prises a lever 19 pivoted to the cam housing 15 at 20 and connected by a link. 21 to an arm 22 that is rigid with a vertical rock shaft 23. This rock shaft has two

gear sectors

24 and 25 thereon which mesh with

gears

26 and 27 on the carrier for the needle The'lever 19 has a follower operating in a cam groove 28 formed in the underside of the cam 14, all as illustrated in the above-mentioned patent. This cam groove is so shaped as to operate the lever 19 and thereby rotate the stitch-forming mechanism at the end of the buttonhole. v

The machine herein shown is provided with the usual means similar to that shown in the various patents above-mentioned for giving the frame 12 a vibrating lateral movement while the stitch-forming mechanism is sewing around the eye end of the buttonhole. This means comprises a sinuous cam groove 29 formed in the underside of the main cam 14 in which groove operates a follower 30 carried by one end of a lever 31. This lever is fast on a shaft 32 which is jour- Du naled in a bearing 33 in the frame 12, said shaft having at its upper end an arm 34, which, in turn, carries a block 35. that operates in a groove in the bed frame 9. This construction is shown quite clearly in the above Patent No. 488,028. The vibrating movement given to the lever 31 by the cam groove 29 will give the head or frame 12 and consequently the stitch-forming mechanism a lateral vibrating movement. r

In the present machine the relative lateral movement. of the stitch-forming mechanism and work-holding means necessary to form the bar is derived from a barring cam, which this respect the construction shown is similar to that illustrated in my co-pending application Serial No. 189,792, filed May 9, 1927. This barring cam is shown at 36 and is situated beneath the bed plate 9 and is connected by a stud 37 that extends through the bed plate with the slide 38 that controls the length of the buttonhole. The operation of this slide in thus determining the length of the buttonhole is set forth in my abovementioned co-pending application and also in the patents above-referred to, to which may be added United States Patent No. 713,764, dated November 18, 1902.

This barring cam is provided with two

cam grooves

39 and 40, each of which has an offset or cam portion 41 as best seen in Fig. 2. The portion 13 of the frame 12 has extending therefrom a bracket arm 42 which to operate in the-

cam grooves

39 and 40, one pin only being operatlve at any given time.

When the machine starts at the beginning of the sewing operation, the pin 43 is operat ing in the groove 39, and as the head 12 moves to the right Figs. 1 and'2 during'the sewing on the first side of the buttonhole, the cam portion 41 of the groove 39 will give the head forming mechanism in a lateral direction du ing the formation of the barring stitches and the side stitches of the buttonhole, all as described in my co-pending application. It will be understood that the cam groove in a which the follower 30 operates, is made with wider portions 45 to allow free movement of the follower 30 when the lateral movement of the head 12 is being controlled by; the

pins

43 and 44.

v The means for controlling the pins-43 and 44v and throwing first one and then the other into operative position, is similar to that shown in my above-mentioned co-pending application, Serial No. 189,792.

Pin 43 is provided at its lower end with a groove 46 in whichis received one arm of a pivot lever 47 pivotedat 48 to the portion 13 of the frame. The pin 44 is provided with a similar groove 46 in which is received an arm 50 that is rigid with asleeve 51 loosely mounted on the stud 48. Each'arm is acted upon by a spring 52, said springs tending normally to urge the

pins

43 and 44 upwardlytoward the barring cam 36. The elbow lever 47 is connected by a link connection 53 with an arm 54 extending laterall from the lever 19 and .the sleeve 51 has rigi therewith a'depending arm 55 which is connected by a link connection 56 with another arm 57 extending laterally from the lever 19 and disposed oppositelylto the arm 54.

During the sewing on the first side of the buttonhole and while the head 12 is moving from its groove 39. This is accomplished by tothe right Fig. 1, the pin 43 is elevated and the upper end thereof is operating in the slot 39, the pin 44 at this time being inits lowered position. I p 4 As the stitching approaches the eye end of the buttonhole and just as the follower 30 enters the sinuous groove 29 for forming the eye, the pin 43 is depressed and withdrawn the engagement of an xup-standing arm 73 which is rigid with the arm 47 with a's'top device 71. The engagement takes place just before the lhead 12 completes its movement to the right Fig. 1, so that during the final -movement, the arm 47 is moved downwardly.

During the sewing around the end of the buttonhole the lever 19 is swung from the full to the dotted line position and during such swinging movement the connection 56 is moved to the left Fig. 2 thereby releasing the arm 50 and allowing its spring 52 to raise it and the pin 44 into engagement with the barring cam 36. The raised pin 44 will enter the groove 40 so that during the return movement of the head 12, and while the stitching on the second side of the buttonhole is being performed, said head will be controlled as to any lateral movement by the cam groove 40.

i It will be understood that when the pin 44 stitching is being formed around the eye of the buttonhole, while if a buttonhole without an eye is to be formed, the control of the lat eral movement of the head 12 will be retained by the barring cam throughout the buttonhole sewing cycle. 'If a buttonhole with an eye is to be sewed, then during the sewing around the eye end of the buttonhole the follower 30 will be operativelyaengaged in the sinuous groove 29 and both

pins

43 and 44 will-be withdrawn from operative engagement with the barring cam 36. On the other hand, if abuttonhole without an eye is to be sewed (such as shown in Figs. 9 and 10) then the follower 30 will be rendered inoperative during the sewing around the eye end of the buttonhole, and, therefore, the head 12 will not be given any vibrating jogging movement by the sinuous cam groove 29, but instead the

pins

43 and 44 will be operative to hold the head from lateral movement, so that at the end of the buttonhole, the stitch-forming mechanism will simply turn about its axis and produce the round end 58 to the buttonhole, as shown in Figs. 9'and10 The follower 30 is shown as slidably mounted in the lever 31, said follower being in the form of apin whichis capable of vertical movement through a sleeve 59 carried by the end of the lever 31. This pin 30 has a lateral arm 60, which extends through a 3 guide slot 61 in a bracket 62 that is carried by the arm 31. The projection 60 is acted upon .by a spring 63 which urges the pin 30 upwardly. hen the/buttonhole witliggan e e is to be sewed, the pin or follower 30wil be i brat'in lateral movement Means are herein provi ed whereby. the pin 30 may be with drawn from engagement wit-h the main cam 14 when it is desirable to form a buttonhole without n eye, as shown in Figs. 9 and 10.

the cam surface 66 is placed so that as the head and the cam casing move toward the right, Figs. 1 and 2 (or toward the left in Figs. 4 and 5) the cam surface 66 will be engaged by a roll 67 that is carried by the follower pin 30. Assuming that the lever 64 is swung into its operative position, shown in dotted lines Fig. 2 at the beginning of the sewing on a buttonhole, such movement will bring the body of the lever. above the roll .67 as shown in Fig. 4. As the head 12 moves toward the right in sewing along the first side of the buttonhole and just before the eye end of the buttonhole is reached, the roll 67 will enga e the cam surface 66 with the result that the follower pin will be forced downwardly out of engagement with the cam 14. When the eye end of thebuttonhole is reached, therefore, there will be no lateral vibrating movement-of the head which is necessary to form the eye, because of the fact that the follower pin 30 is disengaged. from the cam 14. As a result, the turning of the stitch-forming mechanism around the end of the buttonhole will produce a buttonhole with the round end. 58.

In order to maintain proper control of the head 12 while stitching around the end of the buttonhole when the follower pin 30'is in its inoperative position, it is necessary to have said head controlled as to its lateral movement by the barring cam 36, and, consequently, means are provided whereby when the follower pin 30 is moved into its inoperative position the

pins

43 and 44 will remain operative to control the lateral movement of the head duringthe sewing around the end of the buttonhole. The lever 64 extends forwardly beyond its pivot 65, and the forward end is pivotally connected to a rod or bar 68 that is slidably mounted in bearings 69 carried on the underside of the bed 9. This bar has rigid therewith an arm which extends to the rear of the

levers

47 and 50 and is provided with a laterally extending end or head 71. The construction is such that whenthe lever 64 is in its inoperative position, shown in full lines Fig. 2 the end 71 will be in position to engage the up-standing arms 72 and 7 3 which are rigid with the

levers

50 and 47, this engagement occurring just before the head reaches the end of its travel towards the right.

The engagement of the head 71 with the

upstanding arms

72 and 73 as shown in Fig. 3 results in swinging the arms 50-47 downwardly, thereby depressing the pins 43-44 and withdrawing them from engagement with the barring cam 36. This occurs just as the follower 30 passes from the wide portion 45. of the groove 29 into the sinuous portion thereof, and while the stitch-forming mechanism is turning around the end of the buttonhole. \Vith this adjustment of parts the buttonhole with the eye, as shown in Figs. 7 8, will be formed.

If the buttonhole without the eye, as shown in Figs. 910 is to be sewed, the lever 64 will be swung into its operative position, shown in dotted lines Fig. 2. When in this position, the cam face 66 is so placed as to engage the stud 67 and withdraw the follower 30 from engagement with the cam 14 at the time that the stitch-forming 'mechanism is turning around the end of the buttonhole. The placing of the lever 64 in'its operative position also shifts the rod 68 into the dotted line position Fig. 2 thus moving the arm 70 into a position where the head 71 thereof is out of line with the up-standing

arms

72 and 73. Consequently, when the; parts are in the dotted line position Fig. 2, the head 71 is in its inoperative position and it will not act on the lip-standing arms 7273. As a result, the pin 43 will remain in its groove 39 until the head 12 reaches the end of its movement and during the swinging of the lever 19 by which the stitch-forming mecha nism is turned about the end of the buttonhole, said pin 43 will be withdrawn by the connection 53 and at the same time the. pin 44 will be freed by the forward movement of the connection 56, so that the spring 52 will raise the pin 44 into operative engagement with the cam groove 40.- The

grooves

39, 40 are spaced the same at the right hand end as are the

pins

43, 44 so that as the pin 43 is withdrawn from its slot, the other pin 44 may enter the other slot. The right hand ends of the slots 39, 4O are'straight and hence when the follower30 is thus rendered inoperative, the head 12 will be held from lateral vibrating movement as the stitch-forming mechanism is turning around the end of the buttonhole. This will produce the buttonhole without the eye, as shown in Figs. 9, 10.

In order to hold the lever 64 in either of its adjusted positions, I have employed the expedient shown in Fig. 15. The bar 68 operates in an opening 74 in a bracket 69 that is secured to the bed 9. Said bar has on its underside two

notches

75, 76, one of which is adapted to engage thebottom 77 of the open- "tains the bar 68 inits adjusted position, but

permits it to be shifted from one position to the other.

ing 74 when the bar is in one position, and g I have illustrated in Figs. 8, 10 two buttonholes without the bar. The means provided for sewing a buttonhole without the bar are the same as those described in my co-pending application, Serial No. 189,792. This is accomplished by providing means for adjusting the barrin cam relative to the controlling bar 38, said adjustment permitting. the barring cam to be so placed that the engagement of the pin 43 with the cam portion 41 of the slot 39 will occur before the stitchforming mechanism is set in operation, while the engagement of the pin 44 with the cam portion 10 will occur after the stitch-forming mechanism has come to rest.

The controlling bar 38 is provided with an extension 80 to which the bearing cam 36 is secured by the clamping screw 37. This extension 80 is adjustably secured to the bar 38 by means of a clamping screw 81 which eX- tends through a slot 82 in the extension 80 and screws into the bar 38. When the clamping screw 81 is loosened the barring cam may be adjusted toward the left, thus placing it in a position to form the barless buttonhole. To facilitate this adjustment, the extension 80 is provided with a lever 83 pivoted thereto at 84 and having a forked portion 85 embracing a pin 86 extending upwardly from bar 38 and operating in the slot 82. When, therefore, the screw 81 is loosened the adjustment of the barring cam may be effected by turning the lever 83.

I claim:

1. In a buttonhole sewing machine, the combination with stitch-forming mechanism and work-holding means having a relative movement to form stitches along the sides of abuttonhole and around one end, an eyeforming cam forgiving said stitch-forming mechanism and work-holding means relative and work-holding means having a relative movement to form stitches along the sides of a buttonhole and around one end, of ane e-. forming cam for giving said stitch-forming mechanism and work-holding means relative lateral vibiating movement while stitching around the end of the, buttonhole, thereby to form an eye, a stationarily-mounted barring cam for controlling the relative lateral movement of the stitch-forming: mechanism and work holding means at the other end of the buttonhole thereby to form a bar, and means to render either the eye-forming cam or the barring cam operative for controlling such relative lateral movement while stitching around the end of the buttonhole.

3. In a buttonhole sewing machine, the combination with stitch-forming mechanism and Work-holding means having a relative movement to form stitches along the sides of a buttonhole and around one end, an eyeformingcam, means actuated thereby to give the stitch-forming mechanism and workholding means a relative lateral vibrating movement while sewing around the end of the buttonhole, a stationarily-mounted cam element, means actuated thereby to prevent such relative lateral movement while sewing around the end of the buttonhole, and. means to render either the eye-forming cam or the stationarily-mounted cam element operative and the other inoperative.

4. In a buttonhole sewing machine, the combination with stitch-forming mechanism and work-holding means having a relative movement toform stitches along the sides of a buttonhole and around one end, an eyeforming cam, means actuated thereby to give the stitch-forming mechanism and. workholding means a relative lateral vibrating movementwhile sewing around the end of the buttonhole, a stationarily-mounted cam ele ment, means actuated thereby to prevent such relative lateral movement while sewing ders the eye-forming cam inoperative and the I stationarily-mounted cam element operative, and in another position renders the eye-forming cam operative; and the said stationarilymountedcam element inoperative.

5. In a buttonhole sewing machine, the combination with stitch-forming mechanism and work-holding means movable relatively to form stitches along the sides of a buttonhole and around one end, of two cam devices for controlling relative lateral movement of the stitch-forming mechanism and workholding means while sewing around the end of the buttonhole, one of said cam devices be ing stationarily mounted and means to render either cam device operative and the other in operative, one cam device giving the: stitch forming mechanism and work-holding means a relative lateral vibrating movement, and the other cam device preventing relative lateral movement. v

6. In a buttonhole sewing machine, the combination with stitch-forming mechanism and work-holding means movable relatively to each other to form stitches along the sides of the buttonhole andaround one end, of an eye-forming cam for giving the stitch-forming mechanism and'work-holding means a relative lateral vibrating movement while stitching around one end of thebuttonhole thereby to form an eye, a stationarily-mounted barring cam, means co-operating there- V render either the eye-forming cam or the barring cam operative while so sewing around the end of the buttonhole, whereby a button hole either with or without an eye may be sewed.

7. In a buttonhole sewing machine, the combination with stitch-forming mechanism and work-holding means movable relatively to each other to form stitches along the sides and around the end of a buttonhole, of an eye forming cam for giving said stitch-forming mechanism and work-holding means relative lateral vibrating movement while sewing around one end of the buttonhole, a barring cam element and connections actuated thereby for giving said stitch-forming mechanism and work-holdingmeansrelativelateralmovement while sewing at the other end of the buttonhole thereby to form a bar extending in the direction of the length of the buttonhole, said barring cam element being bodily ad- .justable thereby to provide for adjusting the length of the bar said barring cam being also adapted to control the said relative lat rendering the barring cam or the eye-forming cam operative while so sewmg around the first-named end of the buttonhole, said barring cam when operative preventing such relative lateral movement.

8. In a buttonhole sewing machine, the combination with work-holding means and stitch-forming mechanism movable relatively to form stitches along the sides and around the end of .a buttonhole, of two cam elements, a follower for each cam element, connections co-operating with the followers for controlling the relative lateral movement of the stitch-forming mechanism while sewing around the end of the buttonhole, one cam element operating to produce such lateral move ment, and the other cam element operating to prevent it, and means to withdraw either follower from engagement With its cam element, whereby a buttonhole with or with ut an eye may be sewed.

9, In a buttonhole sewing machine, the combination with WOIlI-llQldlIlg means and -sti Cll-fOlIIllIlg mechanism movable relativeform stitches along the sides and around, the nd of a buttonhole, of two cam elements,

a fol ower for each cam element, connections co-operating with the followers for controllingthe relative lateral movement of the tonhole.

stitch-forming mechanism while around the end of the buttonhole, one cam element operating to produce such lateral movement, and the other cam element operating to prevent it, and a controlling member operating in one position to withdraw one follower from engagement with its cam clement.

, and in' another position to withdraw the other follower from engagement with its cam element whlle sewing around the end of a butlO. In a buttonhole sewing machine, the combination with stitch-forn'ling mechanism and work-holding means having a relative movement in the direction of the length of the buttonhole to form stitches along the sides of the buttonhole and around one end, an eyeforming cam for giving said stitch-forming mechanism and work-holding means relative vibrating lateral movement while the stitching is being carried around said end of the buttonhole thereby to form an eye, means to render the eye-forming cam either operative or inoperative, a cam element separate from the eye-forming cam, means controlled there by to prevent the stitch-forming mechanism and work-holding means from relative lateral movement during the sewing around said end of the buttonhole, said cam element and the 'means controlled thereby having the same relative movement in the direction of the length of the buttonhole as the stitch-forming mechanism and the work-holding means, and means to render the cam element operative when the eye-forming cam is inoperative.

11. In abuttonhole sewing machine, the combination with a bed frame, of work-holding means carried thereby, a stitch frame, stitch-forming mechanism carried thereby, said bed frame and stitch frame having a relative movement in the direction of the length of the buttonhole, an eye-forming cam carried by the stitch frame for giving said stitch-forming mechanism and work-holding means relative vibrating lateral movement while the stitching isbeing carried around one end of the buttonhole thereby to form an eye, means to render the eye-forming cam operative or inoperative, a cam element separate from the eye-forming cam and carried by the bed frame, and means controlled thereby during the relative movement of the stitch sewing frame and bed frame to prevent the stitch-- forming mechanism and work-holding means from having a relative lateral movement during the sewing around the end of the buttonhole, and means to render said cam element operative when the eye-forming cam is inframe, two cam devices for controlling relative lateral movement of the work-holding means and the stitch-forming mechanism while sewing around one end of the buttonhole, one of said cam devices being carried by the stitch frame and the other by the bed frame, and means to render either cam device operative and the other inoperative, one cam device giving the stitch-forming mechanism and work-holding means a relative lateral vibrating movement, and the other cam device preventing such relative lateral movement.

13. In a buttonhole sewing machine, the combination with a bed frame, of work-holding means carried thereby, a stitch frame, stitch-forming mechanism carried thereby, saidstitch frame having a movement on the hole, a cam device carried by the bed frame,

means controlled thereby to prevent such lateral relative movement between the stitchforming mechanism and work-holding means, and a controlling member which in one position renders the eye-forming cam inoperative and the cam device operative and in another position renders the eye-forming cam operative and the cam device inoperative.

In testimony whereof, I have signed ,my name to this specification.

JOHN KIEWICZ.