US2126521A - Sewing machine - Google Patents

Description

J. P. WES

.SEWING MACHINE Filed Deo. 10, 1934 4 Sheets-Sheet 1 INVENTOR ATTORNEY a l J. P. WElS SEWING MACHINE Filedbec. 1o, 1954 4 Sheets-Sheet 2 I INVENTOR John P I4/ei.; w22-25N ORNEY Aug. 9, 1938. J. P. wEls 2,126,521

SEWING MACHINE Filed Dec. 1o, 1954 4 sheets-sheet s INVEN'TOR Jom P Weis A TTORNE Y Aug. 9, 1938. J. P. wEIs SEWING MACHINE Filed Dec. l0, 1954 4 Sheets-Sheet 4 l l NV EN TOIR f i L Patented Aug. 9, 193s NITED STATES PATENT cxx-FICE SEWING MACHINE Application December l0, 1934, Serial No. 756,851

35 (Ciaims,

This invention relates to sewing machines, 'particularly to design trimming mechanisms therefor, adapted to edge trim materials a predetermined distance from and adjacent to a line of stitching, of irregular design or cut, and wherein the sewing and trimming mechanisms are operated simultaneously in unison to the end that the article need not be stitched first and then subsequently trimmed, hut may be stitched and trimmed simultaneously with resultant economy.

Heretofore there have been inventions of this character, but with most of these proposals there has been an encumbrance of the cloth plate or of area close to the point of stitching, and with some of .the proposals there has been the need to completely remove the trimming instrumentality when it was desired to stitch wide material Without trimming.

It is a primary object of the present invention to provide a design trimming mechanism which may be moved Wide and clear of the cloth plate of the sewing machine, thereby enabling the operator to manipulate large pieces of material advantageously and to manually control the work close to the needle without inconvenience.

Features resulting from accomplishing this object include the provision of a suspended form of trimming mechanism, which may be easily and quickly moved from an operative position adjacent the cloth plate to an inoperative position far removed therefrom adjacent the top arm of the machine; which may be folded somewhat in the manner of a lazy tong mechanism; and which preferably moves the design cutter with its sharp edges to a protected point far removed from the face and hands of the operator when it is not desired to use the trimmer.

With some of the combination sewing and trimming mechanisms heretofore provided the drive for the trimming cutter is associated with the main drive shaft for the needle or with a main drive shaft in the lower arm of the machine which already serves the purpose of actuating loopers, loop spreaders, and/or Work feeding instrumentalities, and the added load of driving a trimming cutter may, in some forms of machine, strain the shaft and result in breakage or damage to the machine.

It is an object of this invention to provide a driving mechanism for a design trimming mechanism which will operate synchronously with the regular feeding and stitching instrumentalities of the sewing mechanism but which will not impose a heavy load on the already heavily loaded main shafts of the sewing machine.

(ci. 11g-124) A featurein connection with this object of the present invention is the provision of a driving mechanism for the trimming cutter which has no direct connection with the operating shafts in the lower arm of the sewing machine, but is operated by a light top looper or other auxiliary operating rod supported on the top arm of the machine.

It is another object of the present invention to provide a design trimming mechanism for use p with a stitching mechanism which may be added to machines already in the field, conveniently and Without the use of special tools.

A further object is to provide an improved cutter bed so that the work will be thoroughly severed even though there are slight irregularities or wobbles in the cutter, or if some of the teeth thereon become worn more on one side laterally than on the other side.

With most of these previous proposals, even though it is possible to lift the cutter relative to the cloth plate of the machine in order to stitch the article without trimming it, the cutter is continually driven in the raised or inoperative position thereby increasing the danger of cutting the operator and imposing the useless cutter driving load on the main driving mechanism even though the cutter does not work. Eiforts to obviate this disadvantage in the past have resulted in mechanisms requiring special manipulations and in some instances use of special tools.

It is an object of the present invention to provide a driving mechanism for a trimming cutter which Will not drive the cutter when it is in the inoperative (or non-trimming) position relative to the article being stitched, thereby lightening the load on the main driving mechanism, and in which the drive will automatically be disconnected without special manipulation, incidental to the act of moving the trimming cutter into the inoperative position relative to the Work.

In the drawings accompanying and forming part of this specification:

Figure 1 is an end view of a sewing machine and shows the trimming mechanism of the present invention thereon in the operative position.

Figure 2.1s an end view, similar to Fig. 1, but shows the trimming mechanism in the inoperative position.

Fig. 3 is a front view of the complete sewing machine, with the present invention.

Fig. 4 is a detached front view of the trimming mechanism.

Fig. 5 is a fragmentary end View of the work supporting roller.

Fig. 6 is a sectional vlo' taken on line 6-6 in Pis. 5.

'I is a fragmentary sectional view of another form of work support.

Fig. 8 is a fragmentary view of the cutter and throat plate.

Fig. 9 is a fragmentary view of a modied form of drive.

Before explaining the present invention, its mode of operation and advantages in detail, it will be appreciated that the invention is not limited to the exact details of construction and arrangement of parts herein set forth, for it is capable of other embodiments and modications, that portions of the improvements may be used without others, and that the phraseology employed is for the purpose of description and not of limitation.

In the form now preferred, the present invention is shown applied to the well known Metropolitan sewing machine of the type shown in the United States Patent No. 1,961,951 to John P. Weis et al., but may be applied to other sewing machines too. In the present illustrations the sewing machine comprises a frame I0 including a base or lower arm II and upper arm I2 interconnected and supported by a preferably integral vertical trunk I4. The upper arm I2 terminates in a head I5 in which is located a regular reciprocating needle bar I6 carrying a needle I6' operated in the usual way, and locates and supports a presser bar I1 with a presser foot I8 operative under spring pressure relative to a lower arm II and liftable too in the usual and well known manner.

The presser bar I1 has a presser foot I6 attached to its bottom end which coacts with a feed dog I9 of a feed mechanism generally indicated by 20, this feed being the usual four motion feed for moving the work relative to the needle.

Although only one thread carrying needle I6' is shown, for forming one line of stitching of one type, the trimming mechanism 2l of the present invention is equally applicable in sewing machines forming divers types and multiple lines of stitching.

As shown, the thread carrying needle cooperates with a thread carrying looper 22 operated by a looper mechanism 22' thereby forming stitches for sewing the material or for forming a seam.

The needle I6' and feed dog I9 operate through suitable apertures in a throat plate 23 supported by a cloth plate 24 or otherwise secured to the lower arm II in any of the usual ways. The frame I6 supports a rotary main drive shaft 25 for operating the feeder and looper mechanisms 2l and 22' respectively and this shaft through suitable connections drives an upper shaft 26 to reciprocate the needle in the now well known manner.

An extension 21 on the upper shaft 26 formed or secured thereon in any suitable way, forms a crank 2l on this shaft, and carries one end of a' pitman 29. having at its opposite end a slide block Il which is adjustable up and down a curved lever 3i and which 'may be clamped thereon in any desired position as by screws 36', see Figs. l and 3. This lever Il is connected to a long rock shaft I2, rocking in bearings 33 and 84 preferably formed integral with and projecting rearwardly from the main frame I0. Collars 35 and I4 prevent the shaft 32 from moving endwise in the bearings. One rotation of the upper shaft 26, or oscillation thereof if it be of the rocker type, to reciprocate the needle in turn through the crank 2l imparts one complete oscillation to the rocker rod 32.

'I'his rocker shaft 32 may be made with a sewing machine especially for use with the trimming mechanism 2I of the present invention. However, such shafts are regularly provided on several types of sewing machines already in the field for ruining, upper thread loopforming, and like operations; for example, as disclosed in the aforementioned U. B. Patent No. 1,961,951. It is an advantageous feature of the present invention that the trimming mechanism 2| thereof may, in effect, be simply hooked or slid upon the rock shafts of machines now in the field, or with a slightly modified shaft replace the yruflling and like instrumentalities previously on the machine, or in some instances be used with such instrumentalities. Y

Design trimming mechanism In its present preferred form the trimmingr mechanism 2I of the present invention comprises a main frame 31, pivotally mounted on the rocker rod 32 with projections 36 and 39 thereon embracing the bearing 34 to prevent end movement. At its lower end the base member is provided with a swinging bracket 4II having hubs 4I and 42 closely tting sides of a bearing 43 and through a stud 44 beingpivotally mounted thereon.

This swinging bracket 40, as may be seen best in Figs. 3 and 4, is provided with bearings 45 and 46 spaced apart to receive a collar 41 clamped to a cutter supporting shaft 50. Any suitable cutter 48, with zig-zag teeth 49, as shown, or other irregular shape if preferred, is secured to the shaft 50 as by a stud 5I and at its opposite end the shaft supports a clutch 89 including a driving member 52 for oscillatory movement and has a clutch driven member 53 secured thereon as by a screw 53. A preferred form of cutter connection is shown in Fig. 7 wherein the cutter is mounted on a hub 56, section of the shaft 50, held thereon by the screw 5I and held against relative rotation by a pin 56.

The trimming cutter 4B may be shifted laterally any desired extent relative to the needle I6 and the line of stitching, without shifting the base member 31 or bracket 40 laterally by merely loosening the screws 41' and 53 and then tightening them again when the cutter, and resultant trimmed edge, is spaced the desired extent from the line of stitching.

A controlling mechanism 51 is provided to locate, support, and maintain the cutter 48 with the desired degree of pressure relative to a Work support 58 underlying it. The work support may be simply the cloth plate 24 or the throat plate 23 as shown in Fig. 8 or, in order to insure a more satisfactory movement of the work coordinately with the cutter and the feeding mechanism 20, may be as shown in Fig. 7, in the form of a roller 59 rotatable in ball bearings 60 in a suitable bore 6I on the underside of the cloth plate 24 and in turn providing a bearing 62 for the main shaft 25 as for a rotary shuttle hook, bobbin case, or the like as is disclosed more fully in my U. S. Patent No. 1,946,514.

The work support 54 under the cutter 48 may also be of the novel form shown in Figs. 5 and 6 comprising a comparatively large diameter cylinder roller 6I with a large inner chamber 64 adapted to clear the main drive shaft 25 and like as by screws 81.

This form of work support or cutter bed has the advantage of being able to tilt laterally of the machine and the line of feed and thereby compensates automatically for wobble of the cutter and lateral wear of the cutter. Since it is of cylindrical form and unsupported in the center, it may yield to relieve excessive pressures upon the cutter teeth.

The controlling mechanism B1 for the trimming mechanism of the present invention is particularly novel and advantageous and should therefor be particularly noted. It comprises a plain link 68 pivotally mounted on the rocker rod 3E, see Fig. 4, which, through a pivot pin 89 is interconnected to a mating split link 10 secured to the swinging bracket 40 as by a stud 1|. The pair of links 68 and 10 may be moved into an extended position as shown in Fig. 1 or into a folded position as shown in Fig. 2. f

Movement of the pair of links into extended and folded positions, and of the entire trimming device from the operative position shown in Fig. l into the inoperative position shown in Fig. 2, with the cutter 48 far removed from the hands and head of the operator is accomplished, in the present preferred form of the invention by providing a finger 12 pivotally mounted on the pivot pin M between the hub 4i and bearing It and having a pin and slot connection 13 to the solid link 68 thence through a pin 14 to a control knob 15 mounted upon the rocker rod 32 for both pivotal and axial movement.

A hook 16 on the free end of the finger 12 is provided to catch onto a stud 11 preferably on the side of the head I as shown in Figs. l and 4, and in conjunction with the pin and slot connection 13 serves to move the cutter 48 toward the underlying work support with a predetermined amount of pressure. This is accomplished, in the present preferred form, by the pivoted frame 31 and swinging bracket 40, by the lazy tong- like links 88 and 10, by the hook 16 and the pin and slot connection 13 in` a manner now to be del scribed.

-the slot Il.

In order to pass the trimming mechanism 2| from the inoperative position shown in Fig. 2 to the operative position shown in Fig. 1 it is merely necessary for the operator to grasp the knob 15 and pull it axially on the rocker rod l2 until a pin 14' thereon is clear of the bearing lug 34, further axial movement being preferably limited by a large head screw 1l on the end of the rod.

When the pin 14' is clear of the stud the knob 15 and all the associated trimming mechanism parts are. through the pin Il connection to the link 12. rotated about the rod 32 to the operative position shown in Fig. 1 and concurrently the hook 1B catches over the pin 11 and a pin Il rides first along the straight part lil of a slot Il and thence down into an oblique section l2 of Thus, while the knob is turned in a counter-clockwise direction as viewed in Figs. 1 and 2 the links 88 and 10, and the pivoted frame l1 and associated swinging bracket 40 are moved from the folded position shown in Fig. 2 to the extended position shown in Fig. 1.

Movement of these parts into the extended position is limited by the pin II ensuing the end of the slot ll, and may be indirectly too by the operative engagement of the cutter Il with the underlying work support Il.

The oblique slot 82 with the cooperating pin i t! serves the double useful purpose of initially raising the swinging bracket lll and the cutter 48 thereon relative to the work support when the knob 15 is initially turned in a clockwise direction, for as the pin 89 rides up the oblique slot 82 into the straight slot l0, the links 68 and 10 are folded and a foreshortening occurs between the pivot 1l and the pivotal connection ofthe link 68 to the rod 32 and similarly a nal strong pressure movement of the cutter I8 toward the work support 58 is accomplished as the knob 15 is given its final turning movement to bring the links 68 and 10 into the extended position.

Location of the cutter 48 and regulation of pressure thereof relative to the work support 5B is accomplished through the provision of a regulating screw I4 with lock nuts 85 on the split link 1li as may be seen best in Figs. 1 and 2. When it is desired to release pressure it is merely necessary to release the lock nuts and turn the screw any desired degree, then tighten the lock nuts again.

When it is desired to move the trimming mechanism 2i into the inoperative positionit is merely necessary for the operator to turn the knob 15 in a clockwise direction as viewed in Fig. 1 where upon the swinging bracket 40 and cutter I8 are raised relative to the work support 58 and then the hook 1B, through the pin and slot connection 13, is raised from the pin 11. Thereafter the folded members are, with the knob 1E, swung about the rod 32 to the position shown in Fig. 2 and the operator need merely push the knob axially toward the head I5 whereupon the pin 14' moves under the bearing 3l to lock the complete trimming mechanism 2i in the raised inoperative position fully in back of the upper arm i2 so that there will be no danger of the operator striking it with his head, and far removed from the cloth plate so that the operators hands will not be injured or interfered with in any way.

Some of the important advantages of the folding characteristic of the trimming mechanism 2| is that the main pivot thereof may be located at a remote point while the cutter is central laterally adjacent the needle, that the cutter may be in advance of the pivot a considerable extent, and that the cutter will be a shorter distance from the pivot when it is desired to move it to the inoperative position so that no costly and inconvenient clearance cut-out need be provided in the cloth plate 2l or other work support.

If, from a practical standpoint. it is preferred not to mount the trimming mechanism 2| directly upon the rocker rod I2 a sleeve 32', as shown by dot-and-dash lines in Fig. 4, may be provided to form a bearing for the rocker rod, to form a pivotal mounting for the pivoted frame 31 and link I8, and to provide a pivotally and axially movable mounting for the knob 1i. It is within the purview of this invention to mount the trimming mechanism otherwise, but definite economies in manufacturing cost and operating advantages are accomplished by the present shown method.

Also, it should be noted that the pivoted frame I1 may be provided with a lug 86. see Fig. 4, adapted to engage the bearing Il or frame I il to limit movement of the complete trimming mechanism 2| into the operative position, thereby more positively aligning the hook 1l with the pin 11.

Driving connection for trimmer In combination sewing and trimming mechanisms. especially wherethe trimming is a design cut, it is very important that the cutter be driven positively, in absolute synchronism and with the same peripheral speed as the main feed mechanism. Otherwise the material will be puckered and the line of stitching will be formed in a curved rather than a straight path.

A unique and highly eflicient driving mechal nism 8l is provided by the present invention preferably comprising any usual ball or roller type clutch I9 on the cutter shaft B0 with the driver member secured thereto by the screw 53 and the driving member 52 mounted for tree rocking movement thereon. The driving member is, through a link 90 connected to a driver iinger 9|, the latter being at its lower end pivotally mounted on the shaft 44 and at its upper end engaged with and held against a finger eccentric l2 as by a compression spring 93 having pin connections I4 and 95 with the pivoted frame 31.

The eccentric 92 is secured to the rocker rod 32 by a yoke I1 and screw 91. Stroke of the eccentric is from the solid line to the dot-and-dash line position shown in Fig. 1.

As the ilnger eccentric 92 is moved from the solid line to the dot-and-dash line position shown in Fig. 1 it moves the driver finger 9i and link 90 to the right and in turn causes the driving member 62 (through ball, rollers, or the like, in the well known manner, see Fig. 7) to rotate the driven member 5I and interconnected cutter a predetermined extent, coordinately with the main feeding mechanism. When the finger eccentric l2 is rocked back again the spring Il pulls the driver finger 9|, link SII, and driving member 52 to the left and the latter moves inefiectively relative to the driven member I3 in the well known manner of clutches of this type.

If the main feeding mechanism is adjusted to get more or fewer stitches per inch it is a simple matter to adjust the driving mechanism 88 of the present invention by merely loosening the screw Il' and moving the finger eccentric 92 any desired extent on the rocker rod 32 until it drives the clutch 89 and cutter 4I the right extent.

Now it should be particularly noted that the driving mechanism 8l is automatically rendered inoperative for driving the clutch I9 and cutter 4l when the trimming mechanism 2| is moved to the inoperative position, as shown in Fig. 2.- This is accomplished by providing a concentric section Q2' on the finger eccentric 92 with which the drivcr finger 9| engages when the trimming device is moved to the inoperative position; whereupon the eccentric 92 moves ineifectively relative to the driver finger li and associated parts.

Fig. 9 discloses a modiiied form of drive in which the finger eccentric $2 is replaced by a slightly different eccentric 0I. round with its axis merely ofi'set relative to the axis or the rocker rod 32, it is possible to use a driver linger 99 with an elongated slot |00 and thereby dispense with the compression spring 93.

`This drive may be used equally well with both the rocker rod 32 as shown, or with a similar rotatable rod which is occasionally provided in some types of sewing machines. An adjustment such as shown in my U. S. Patent No. 1,961,951 may be provided for the rod 32 when the eccentric 9| is used or in place of the yoke $1.

Other variations and modifications may be provided within the scope of the present invention,

The latter being and portions oi' the improvements may be used without others.

Having thus described the invention, what is claimed as new, and for which it is desired to obtain Letters Patent is:

1. In a sewing machine the combination oi' a frame; an upper arm; a lower arm; a stitching mechanism; a trimming mechanism; a circular cutter in said trimming mechanism; driving means for said stitching and trimming mechanisms; mounting means for said trimming mechanism on the upper arm, and extending downwardly therefrom. said means being swingable to locate the trimming mechanism in an operative position adjacent the stitching mechanism and in a raised inoperative position entirely clear of the lower arm; and means for automatically rendering the driving means inoperative for the trimming mechanism when the latter is moved to the inoperative position.

2. In a sewingmachine the combination of a main frame; an upper arm on the main frame; a stitching mechanism; a circular trimming cutter; a foldable trimming mechanism, including said circular trimming cutter, for trimming the stitched edges of the work; driving means; and means for folding said trimming mechanism and moving it from an operative position below the upper arm and adjacent the stitching mechanism to a raised inoperative position adjacent the side of the arm.

3. In a sewing machine the combination of a main frame; an upper arm on the main frame; a stitching mechanism; a circular trimming cutter; a foldable trimming mechanism including said circular trimming cutter; driving means; and means for moving said circular cutter from an inoperative position at the side of the upper arm into an operative position below the upper arm and adjacent the stitching mechanism, and to concurrently move the trimming mechanism from a folded into an extended position.

4. In a sewing machine the combination of a main frame; an upper arm on the main frame; a stitching mechanism; a trimming mechanism; driving means; a mounting for said trimming mechanism, permitting movement thereof from an operative position below the upper arm and adjacent the stitching mechanism to a raised inoperative position at the side of the arm; means for rendering the driving means inoperative for the trimming mechanism when the latter is moved to the inoperative position; and a knob associated with said trimming mechanism and said means, for moving said trimming mechanism from the operative position to the inoperative position andcapable of locking it in the latter position.

5. In a sewing machine the combination of a main frame; a work support; an upper arm on the main frame; a stitching mechanism; a feeding mechanism; a trimming mechanism; driving means; a mounting for locating and supporting said trimming mechanism permitting movement thereof from an operative position below the upper arm and adjacent the stitchlng mechanism to an inoperative position to the rear of the arm; and means clear of and spaced upwardly from said work support for locking said trimming mechanism in both the operative and the inoperative positions.

6. In a sewing machine the combination of a stitching mechanism; a trimming mechanism, including a pivoted frame and a swinging bracket; a pivot stud between said frame and said bracket; driving means; a cutter shaft on said swinging bracket;` a clutch on said cutter shaft; a driver nger pivotally mounted on said pivot stud and associated with said driving means; and a link connecting said clutch with said driver finger.

7. In a sewing machine the combination of a stitching mechanism; a feedingl mechanism; a trimming mechanism; driving means; and a pair of toggle links adapted to move said trimming mechanism into operative and inoperative positions relative to the stitching and feeding mechanisms.

8. In a sewing machine the combination of a stitching mechanism; a feeding mechanism; a trimming mechanism including a. circular cutter; driving means; a work support, a pair of toggle links adapted to move the trimming mechanism into operative and inoperative positions relative to the stitching mechanism; and a regulating screw in one of said toggle links adapted to adjust the pressure of the cutter relative to the work support.

' 9. In a sewing machine the combination of a stitching mechanism; feeding mechanism; a trimming mechanism including a pivoted frame and a swinging bracket movable into operative and inoperative positions relative to the stitching mechanism; and a toggle link connection for moving and maintaining said pivoted frame and swinging bracket in an extended position relative to each other and in the operative position relative to the stitching mechanism.

10. In a sewing machine the combination of a stitching mechanism; feeding mechanism; a frame pivotally mounted on the sewing machine; a swinging bracket; a pivotal connection between said frame and said bracket; a lever mounted on said pivotal connection; a hook on said lever adapted to catch onto the machine; a pair of toggle links for folding and extending the pivotally mounted frame and bracket; and a pin and slot connection between said toggle links and said lever for conditioning the hook relative to the machine when the toggle links are used to move the bracket into folded and extended positions.

Cil

11. In a sewing machine the combination of a main frame, supporting a needle, looper, and feed instrumentalities; an upper arm on said main frame; an upper shaft in said arm for operating the needle; a rod supported by and extraneously of said upper arm and operated by said upper shaft; `driving means; a work support; and a. trimming mechanism pivotally mounted on said rod for movement into operative and inoperative positions relative to the work support.

12. In a sewing machine the combination of a main frame, supporting va needle, looper, and feed instrumentalities; an upper arm on said frame; an upper shaft in said arm for operating the needle; a rod supported by and extraneously of said upper arm and operated by said upper shaft; a work support; a trimming mechanism pivotally mounted on said rod for movement into operative and inoperative positions relative to the work support; and means associated with said rod for imparting movement to the trimming mechanism coordinately with movement of the needle and feed instrumentalities by the driving means.

13. In a sewing machine the combination of a frame supporting stitching and feeding mechanisms; driving means; a semi-floating work support; .a pair of rollers upon which said work support rotates; a foldable trimming mechanism;

and means for folding said trimming mechanism and for moving it into an inoperative position removed from the semi-floating work support.

14. In a sewing machine the combination of a frame supporting stitching and feeding mechanisms; driving means; a rocker rod on said frame; a foldable trimming mechanism pivotally mounted on said rocker rod; a semi-floating work support; a pair of rollers upon which said semi-floating work support rotates; and means for folding and moving said trimming mechanism about the rocker rod into operative and inoperative positions relative to the semi-floating work support.

l5. In a sewing machine the combination of a frame for supporting stitching and feeding mechanisms; driving means; a work support; a trimming mechanism; a single means for folding said trimming mechanism and for moving it to both operative and inoperative positions relative to the work support; and means for locking the trimming means in the operative and inoperative positions while the driving means remains in connected condition.

16. In a sewing machine the combination of stitch forming mechanism; work feeding mechanism; a rocker rod; driving means; a finger eccentric on said rocker rod; .a trimming mechanism pivotally mounted on the rocker rod and 4operated by said nger eccentric.

17. In a sewing machine the combination of a. stitching mechanism; feeding mechanism; a rocker rod; driving mechanism; trimming mechanism pivotally mounted von the rocker rod for movement to operative and inoperative positions relative to the stitching mechanism; a finger eccentric on the rocker rod having driving and concentric sections; and a driver finger on said trimming mechanism adapted to engage the driving section of said finger eccentric when the trimming mechanism is in operative position and to engage the concentric section thereon when it is in the inoperative position.

18. In a sewing machine the combination of a main frame, supporting stitching, and feeding mechanisms; driving means; a pivoted frame on the main frame; a swinging bracket mounted upon the pivoted frame; a cutter on said swinging bracket; and means on said bracket associated with said driving means adapted to operate said cutter coordinately with said feeding mechanism.

19. In a sewing machine the combination of a frame; an upper arm; a lower arm; a stitching mechanism; a circular cutter; a trimming mech- `anism including said circular cutter; driving means; a mounting for said trimming mechanism, permitting movement thereof from an operative position below the upper arm and adjacent the stitching mechanism to an inoperative position adjacent the side of the upper arm and clear of the lower arm; and a handle and a plurality of links associated with said trimming mechanism and mounting means adapted to move the trimming mechanism to the operative and the inoperative positions.

20. In a sewing machine the combination of a frame; an upper arm; a lower arm; a stitching mechanism; a circular cutter; a trimming mechanism including said circular cutter; driving and mounting means adapted to move the trimming mechanism to the operative and the inoperative positions; and means adapted to lock the handle and the associated trimming mechanism in the operative and the inoperative position.

21. In a sewing machine the combination of a frame; an upper arm; a lower arm; a stitching mechanism; a circular cutter; a trimming mechanism Iincluding said circular cutter; driving means; a mounting for said trimming machanism,

permitting movement thereof from an operative position below the upper arm and adjacent the stitching mechanism to an inoperative position adjacent the side of the upper arm and clear of the lower arm; a handle associated with said trimming mechanism and mounting means adapted to move the trimming mechanism to the operative and inoperative positions; and a pin on the handle adapted to lock the handle and the associated trimming mechanism in the inoperative position.

22. In a sewing machine the combination of a frame; an upper arm; a lower arm; a stitching mechanism; a circular cutter; a trimming mechanism including said circular cutter; driving means; a mounting for said trimming mechanism, permitting movement thereof from an operative position below the upper arm and adjacent the stitching mechanism to an inoperative position adjacent the side of the upperarm and clear of the lower arm; a handle associated with said trimming mechanism and mounting means adapted to move the trimming mechanism to the operative and the inoperative positions; and a pin and slot connection adapted to lock the trimming mechanism in the operative position.

23. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; and supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm.

24. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and means adapted to maintain said circular cutter and the supporting means in the operative and the inoperative position. I,

25. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and means adapted to lock said circular cutter and the supporting means in the operative and the inoperative position.

26. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a. circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position. adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm' and entirely clear of the lower arm; and a pin and slot connection adapted to maintain said cutter in the operative position.

27. In a sewing machine the combination of Aa. frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanismv and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and a handle adapted to swing the circular cutter and the supporting means pivotally about the operating rod into the operative and the inoperative positions.

28. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; a handle adapted to swing the circular cutter and the supporting means pivotally about the operating rod into the operative and the inoperative positions; and means adapted to maintain the circular cutter and supporting means in the operative and in the inoperative positions.

29. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; a handle adapted to swing the circular cutter and the supporting means pivotally about the operating rod into the operative and the inoperative positions; and means associated with said handle adapted to maintain they circular cutter and supporting means in the operativefand in the inoperative positions.

30. In a sewing machine thefcombination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and an eccentric on said operating rod adapted to impart step-by-step movement to said circular cutter.

31. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in' an inoperative position adjacent the side of the upper arm' and entirely clear of the lower arm; and driving means on said operating rod adapted to impart step-by-step movement. to said circular cutter.

32. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular" cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; driving means on said operating rod adapted to impart step-by-step movement to said circular cutter; and means adapted to vary the extent of step-bystep movement imparted by the driving means.

33. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and a pitman connection between said drive shaft and the operating rod adapted to impart step-by-step movement to the circular cutter.

34. In a sewing machine the combination of a frame; an upper arm; a lower arm; a drive shaft in the upper arm; an operating rod; stitching mechanism; a circular cutter; supporting means pivotally supporting said cutter on said operating rod in an operative position adjacent the stitching mechanism and the lower arm, and in an inoperative position adjacent the side of the upper arm and entirely clear of the lower arm; and an adjustable pitman connection between said drive shaft and said operating rod adapted to impart variable extents of step-by-step movement to said circular cutter.

35. In a sewing machine the combination of a stitch' forming mechanism; a main frame; a lower arm; an upper arm; a supporting frame pivotally associated with the upper arm and entirely clear of the lower arm; a rotary cutter carried by said pivoted frame; and lever means entirely clear of the lower arm for moving the pivoted frame and cutter to raised inoperative and lowered operative positions.

JOHN P. WEIS.

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