US2828704A - Ornamental stitching attachments for sewing machines - Google Patents

Description

J. P. ENOS April 1, 1958 2 Sheets-Sheet 1 INVENTOR John P Enos ATTORNEY WITNESS 'no 54 55 Z wic c bfl/ April 1, 1958 J. P. ENOS 2,

ORNAMENTAL STITCHING ATTACHMENTS FOR SEWING MACHINES Filed Oct. 8. 1954 2 Sheets-Sheet 2 ATTO NEY United States Patent ORNAMENTAL STlTCI-HNG ATTACHNIENTS FOR SEWING MAHINES John P. Enos, Union, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application Qetober 8, 1954, Serial No. 461,149

24 Ciaims. (Cl. 112-160) This invention relates to work-jogging attachments for sewing machines, and more particularly to a pattern-cam controlled work-jogging attachment in which the cam is readily interchangeable so that any one of a number of ornamental stitch patterns may be produced simply by insertion into the attachment of the proper pattern-cam.

It is an object of this invention to provide a Workjogging attachment in which the pattern-cam may be removed and replaced without dismantling or disassembling any other part of the attachment, so that the danger of misplacing attachment parts or of improperly reassembling parts is obviated.

It is also an object of this invention to provide a pattern-cam-controlled work-jogging attachment in which the pattern-cam may, by one simple movement, either be separated from or positioned into operative relation with the cam actuating means as well as with the cam following means.

Still another object is to provide an ornamental stitching attachment of the above character having a frame cover which encloses the actuating mechanism of the attachment and into which a circularly moving patterncam is shiftable axially through an aperture in the frame cover into operative engagement with the actuating mechzansm of the attachment.

Another and more specific object of this invention is the provision of a work-jogging attachment having a vertically arranged pattern-cam shaft together with a pattern-cam which may be dropped on said cam-shaft and into operative engagement with a cam follower.

Still another object of this invention is to provide a pattern-cam which is constructed and arranged in a novel manner so as to be insertable readily into an ornamental stitching attachment of the above character.

It is also an object to provide an interchangeable pattern-cam which is formed with means whereby it may conveniently be gripped and shifted into or outof the work-jogging attachment.

'With the above and additional objects and advantages in view which will hereinafter appear, this invention comprises the devices, combinations and arrangements of parts hereinafter described and illustrated in the accompanying drawings of a preferred embodiment in which:

Fig. 1 is a top plan view of the work-jogging attachment of my invention as it is applied to a sewing machine and in which the frame cover lid is illustrated in open position, and a small portion of the lid shown in dotted lines in its closed position to illustrate a cam positioning mark thereon.

Fig. 2 is a right side elevational view of the attachment and illustrates the frame cover lid in closed position in solid lines and in open position in dashed lines.

Fig. 3 represents a cross section taken substantially along line 33 of Fig. 2.

Fig. 4 is a bottom plan view of the interchangeable pattern-cam.

. Fig. 5 is an enlarged top plan view of the work-jogging attachment with the frame cover removed and the pattern-cam illustrated in phantom lines so as to expose the actuating mechanism.

Fig. 6 is a right side elevational view of the attachment of Fig. 5 with the pattern cam illustrated in cross section. I

Fig. 7 is a left side elevational view of the attachment with the pattern-cam sectioned substantially along line 7-7 of Fig. 5. V 7

The ornamental stitching attachment of this invention is preferably of the well known sewing machine attachment type of construction in which the attachment is rigidly secured to the presser-bar of the sewing machine and the reciprocating needle-bar of the sewing machine is harnessed to drive the attachment. Referring to the drawing, this attachment is constructed upon a frame which comprises a base plate 10 from the forward portion of which extend spaced upstanding ears 1111 between which is secured, as by rivets 12-12, ametal block 13 which is slotted at 14 forwardly of the ears 11-11 snugly to accommodate the lower extremity of a sewing machine presser-bar 15. A knurled fastening screw 16, of the type normally employed to secure a presser foot to the presserbar, serves to maintain the block 13, and hence the attachment frame, securely in place on the presser-bar. The screw 16 is shouldered, as

at 17, to provide a necked portion 18 which is confined loosely within an inclined aperture 19 formedin "a finger 29 extending forwardly from one of the upstanding frame ears 11. A slot 19' is formed from the aperture 19 to the edge of the finger 20 so that during assembly the aperture 19 may be opened for reception of the necked portion 18 of the fastening screw. After the fastening screw is in place, the finger 20 may be flattened into its original configuration so as to hold the fastening screw captive in the aperture 19 thus insuring that it cannot thereafter become misplaced.

Power to drive the work-jogging attachment is derived from the reciprocation of a sewing machine needle-bar 21 by means of an actuating lever 22 carried by a fulcrum pin 23 which is journaled in the upstanding ears 1111 of the attachment frame. The actuating lever 22 is bifurcated at its free extremity and is disposed to embrace a cylindrical projection 24 of a conventional needleclamp 25 into which projection a thumb screw 26 is threaded so as to secure a needle 27 to the extremity of the needle-bar 21.

The reciprocation of the needle-bar thus imparts oscillatory movement to the actuating lever 22. This oscillation is utilized in a manner which will presently be described in detail to impart lateral swinging motion to a work-feeding foot 28 which forms a part of the attachment. The work-feeding foot is bifurcated as is illustrated in Figs. 1 and 5 and is formed with a transverse slot 29 to accommodate the needle as the foot 28 is swung into an extreme lateral position at either side. A shank 30, which joins the work-feeding foot, is ofiset upwardly at its juncture with the work-feeding foot 28 and is formed with a longitudinal slot 31 which embraces a fulcrum pin 32 about which the shank and the work-feeding foot turn. The fulcrum pin 32 extends upwardly from a slide plate 33 which underlies the shank 30 of the feeding foot. An upwardly extending guide pin 34 which projects from the slide plate 33 engages a similar slot 35' formed in the bottom plate 10 of the attachment frame so that.

turned upwardly to provide a flange 36.which at theirear ward extremity is provided with an outturne'd finger grip 37. The fiange36 is .slotted, as at 38, to accommodate a clamp screw 39 which is threaded into the car 11 of the attachment frame, and which serves to lock the slide plate 33 in a selected position of adjustment longitudinally of the frame. With reference to Figs. or 7, it will be apparent that the position of the fulcrum pin 32 in the slot 31 of the feeding foot shank will control the extent of lateral motion of the foot for any given degree of actuation thereof since the lever arm from the feeding foot to the fulcrum pin may be lengthened or shortened by adjustment of the position of the fulcrum pin 32. Rearwardly of the slot 31 the shank of the feeding foot is offset an additional amount upwardly and is therein provided with an upstanding cam-follower pin 40. The upper extremity of the cam-follower pin is shouldered and is fitted with a roller 4-1 which is secured on the pin 40 by the upset top portion of the pin. The shouldered base of the pin 4% is disposed in a transverse slot 42 formed in an arched bracketmember 43 which is fastened as by screws 4444 to the base plate it of the attachment frame.

The manner in which oscillatory movements of the actuating lever 22 are utilized to transmit transverse work-jogging motion ot the feeding foot will now be described. The actuating lever 22 is provided with a downwardly extending arm 45 formed at its extremity with an outturned lug 46 which is embraced by spaced upwardly projecting fingers 47-47 of a slide plate 4% which is confined to movement longitudinally upon the attachment frame by means of a pair of pins 49-4-9 which extend upwardly from the base plate 1% of the frame and are fitted into longitudinally arranged slots 50-50 formed in the slide plate 48 Pivoted on the slide plate 48 by means of a pivot pin 51, is a pawl 52 which is biased by means of a wire spring 53 in a counterclockwise direction, as viewed in Fig. 5, and into operative relation with a ratchet wheel 54-. The ratchet wheel 54 is preferably formed with an integral upstanding cylindrical hub portion 55 which is formed at its free upper extremity with a shouldered portion 56 of reduced diameter. The ratchet wheel 54 is confined for rotation on a cam stud-shaft 57 which is secured on a substantially vertical axis in the base plate 10 of the attachment frame.

Indicated generally in the drawings as 58 is a patterncam which is preferably formed with a fiat cylindrical bottom portion 59 and an upwardly extending finger grip portion 60 which is frusto-conical in shape and which is fluted to provide a more secure grip. The bottom portion 59, as best shown in Fig. 3, is formed with a tapered axial bore 61 of which the mouth is downwardly flanged,

to provide, in effect, a deeper bore. The bore 61 of the pattern cam is adapted to embrace the hub portion 55 of the ratchet wheel 54 on the cam stud-shaft 57.

As is illustrated in Fig. 3, the tapered bore 61 of the pattern-cam when it is positioned on the cam-shaft and on the ratchet wheel hub makes a ring contact at the upper edge of the shouldered portion 56 of the hub and another ring contact at the upper edge of the main hub portion 55. In practice it has been found that by this arrangement, a more satisfactory fit may be obtained between the cam and the ratchet wheel hub than if both parts were to be made, for instance, of the same taper. In other words, if both parts were tapered, any variation in tolerances of the parts or any grit or other foreign matter that should happen to be carried between these parts would cause the cam bore to seat improperly and thus make the cam wobble on the hub.

In order to provide a readily separable driving interlock between the pattern-cam and the ratchet wheel which is fast on the cam stud-shaft, the upper free extremity 56 of the ratchet wheel hub is formed at each side with a .notch 62. Complemental to the notches 62 in the hub, are lugs 63-63 which are formed at the bottom of the axial bore 61 in the pattern-cam 58. As the patterncam is lowered axially upon the ratchet wheel hub, two

positions exist 180 apart in which the cam bore will seat completely upon the hub with the lugs 63-63 disposed within the notches 62-62. It will be clear, however, that while this is the preferred manner of interlocking the parts, any variation of this form is Within the contemplation of this invention provided only that the interlock must be established and separated upon only a relative axial movement between the parts.

The flat cylindrical bottom portion 5% of the patterncam is provided with a cam groove 6-1, as best shown in Fig. 4. The cam groove is formed in the bottom face of the bottom portion 59 which is the face opposite that from which the finger grip 60 extends. Referring to Fig. 3, it will be clear that the roller follower 41 is carried on a vertical axis which is parallel to the vertical axis of the cam stud shaft 57. As the pattern-cam is shifted axially with respect to the cam-shaft, therefore, engagement or separation may readily occur between the axial bore 61 of the cam and the ratchet wheel hub on the cam shaft, between the lugs 63-63 in the axial cam bore and the notches 62-62 in the ratchet wheel hub, and between the cam groove 64 and the cam follower. The ratchet wheel hub provides an axis about which the pattern cam is supported for turning movement, the notches 62-62 and the lugs 63-63 provide a means for locking the cam operatively with respect to the actuating mechanism of the attachment, and the cam groove and follower, of course, provide the means for jogging the workfeeding foot from side to side. The present construction thus provides a mechanism whereby these means may all be brought into operative unity merely by the relative axial movement of the pattern-cam into place upon the carnshaft.

Referring, more particularly, to Figs. 1, 2 and 3, the attachment is provided with a frame cover indicated generally as 65. The cover 65 is formed with a forwardly extending arched hood portion 66 which encases the up standing ears 11-11 of the frame and which is apertured to accommodate a fastening screw 67 which is threaded into the metal block 13. Rearwardly of the hood portion 66, the cover 65 is formed with a flattened and broadened portion 68 which serves to encase the actuating mechanism of the attachment. This flattened portion 68 overlies the base plate 10 of the frame and is secured to the base plate by a fastening screw 69. An aperture 70 is formed in the top of the flattened portion 63 of the frame cover which, as shown in Fig. 1, serves to expose the axially projected cross sectional area of the pattern-cam 58. A lid 71 which is hinged to the flattened portion of the frame cover by the pivot pin 72 is arranged to be opened to a positon as shown in Fig. 1 in which the aperture 70 is uncovered and the pattern-cam may be lifted axially out of engagement with the mechanism of the attachment. In Fig. 2, the lid 71 is illustrated in solid lines in its closed position. The lid is formed with a clearance aperture 73 through which the upwardly extending finger-grip portion 60 of the patterncam extends, as is illustrated in Fig. 3 and as is shown in the fragmentary dotted line position of the lid in Fig. l. A pair of leaf spring members 74-74 are secured inside the lid 71, as by rivets 75-75, one spring member at each side of the lid aperture 73. Forwardly of the rivets 75-75 the spring members are downturned, as at 76, to provide a latch lock which engages the frame cover and resiliently maintains the lid in closed position. The spring members 74-74 rearwardly of the rivets 75-75 are arched downwardly, as at 77-77, and are disposed as illustrated in Fig. 3 to bear downwardly against the cylindrical body portion of the pattern-cam 58. When the lid is latched in closed position the spring portions 77-77 of the lid 71 thus serve to retain the patterncam seated on the hub portion 55 in operative relation with the cam follower 41, and to apply a frictional braking action to the pattern-cam to prevent overthrow or retrograde movement thereof.

By means of a protruding finger-grip 78 formed on the frame cover lid 71, the spring latches 76-76 on the lid may easily be flexed and the lid raised to the position illustrated in Fig. 1 or to the dotted line position of Fig. 2 to expose the pattern-cam 58. By gripping the fingergrip portion 66, the cam may be lifted vertically out of the attachment and a selected one of a plurality of cams, each with a differently organized cam-groove, may be reinserted simply by dropping the desired cam vertically upon the ratchet wheel hub. To facilitate selection of the desired cam, a representation, as shown at 79, may be embossed, etched, or otherwise marked on the exposed face of the pattern-cam finger-grip to indicate the shape of the ornamental stitch pattern which that particular cam will produce. In practice it may be necessary to turn the cam upon insertion so that the lugs 63-63 in the pattern-cam bore will enter the notches 62-62 and also so that a portion of the continuous cam groove will be brought into registry with the cam follower so that the cam follower will enter the cam groove. With the arrangement of notches 62-62 and lugs 63-63 of the preferred embodiment it should not be necessary to turn the cam more than 180 to accomplish this necessary alignment and in any event, this simple turning operation will automatically result in the proper registry and cooperation of parts. When the cam drops into place, the lid 71 is closed and the latch springs 76-76 resiliently maintain the lid in closed postion and the portions 77-77 of the springs bear upon the pattern cam and hold it on the ratchet wheel hub.

The width of the stitch pattern or, in other words, the bight of the stitches to be produced may be varied by adjustment of the slide plate 33 and the consequent shift of the longitudinal position of the fulcrum pin for the work-feeding foot 28. This adjustment is accomplished by loosening the clamp screw 3h, and by means of the finger-grip 37, shifting the slide plate 33 to the desired position. Indicia are preferably placed on the slide plate to indicate the range of bight adjustment that is possible. These indicia, as illustrated in Fig. 7, cooperate with a pointer 80 which is formed to protrude from the attachment frame cover 65, as shown in Figs. 1 and 3.

With the desired cam inserted in the attachment and the proper bight adjustment having been established, the attachment will be ready to operate. As is conventional With work-jogging attachments of this type, the attachment serves only to jog the work laterally of a line of stitch formation, and the progression of work material past the needle depends on the feeding instrumentalities of the sewing machine.

In initiating a stitch pattern or in continuing a pattern of existing stitches, it is frequently desirable to know the location of the cam at any point in the stitch pattern or, conversely, it is important to be able to set the attachment at some logical starting point in a pattern of stitches. i

For this purpose, the exposed face of the finger-grip 69 on the pattern cam is formed with indicia preferably in the form of an arrowhead 81 which is adapted to cooperate with a reference point such as a line 82 on the attachment cover lid, as shown in Fig. l to indicate the cam position. It has been found most practical to arrange the arrowhead 81 and the line 82 to correspond to a position of the work-feeding foot which is centrally located with respect to the straightaway line of stitch formation of the sewing machine.

From the foregoing it will be understood that upon operation of the sewing machine, the needle-bar reciprocation will oscillate the actuating lever 22 which, in turn, will reciprocate the slide plate 48. The pawl 52 carried on the slide plate will act to impart an intermittent turning movement in one direction to the ratchet wheel 54, such movement of the ratchet wheel occurring during the upstroke of the needle-bar and while the needle is raised out of the work. The pattern-cam, being secured for rotation with the ratchet wheel, will be turned a corresponding increment and by means of the cam groove 64, the cam follower roller 41 and, therefore, the workfeeding foot will be jogged transversely of the line of progression of the work fabric past the needle.

In many instances, it is desirable to be able to produce straight lines of stitches without removing the ornamental stitch attachment from the machine. In the attachment of this invention a throw-out lever 83 which is provided for this purpose is pivoted, as at 84, to the slide plate 48 of the cam-actuating mechanism. The throw-out lever 83 underlies a projection 85 of the pawl 52 and is provided with an upstanding pin 86 which enters a T-shaped aperture formed in the projection 85 of the pawl. The aperture includes a slot portion 87 corresponding to the cross bar of the T, which slot portion is disposed substantially tangential to the normal path of turning movement of the pawl 52 about its pivot pin 51, and a slot 88 corresponding to the leg of the T, which leg portion is disposed to extend substantially radially outwardly from the pivot pin 51 of the pawl. When the throw-out lever is in the position illustrated in Fig. 5, the pin 86 plays in the slot portion 87 and exerts no influence upon the pawl operation. When the throw-out lever is turned to the throw-out position, as illustrated in dotted lines in Fig. 5, the pin 86 enters the slot portion 88 which frictionally holds the throw-out lever in the dotted line position and draws the pawl away from operative engagement with the ratchet wheel 54. In the throw-out position, the slide plate 43 reciprocates idly and the attachment is ineffective to jog the work laterally, and a straight line of stitches results.

Having thus described the what I ciaim herein is:

l. A work-jogging attachment for a sewing machine comprising an attachment frame, a work-shifting member, means defining a pivotal axis about which said work-shifting member turns with respect to said attachment frame, a cam follower carried by said work-shifting member, an interchangeable pattern-cam, means carried by said attachment frame defining a pivotal axis for turning movement of said pattern-cam, said axis being parallel to the nature of the invention,

pivotal axis about which said work-shifting member turns' with respect to said attachment frame, actuating means carried by said attachment frame and adapted to be operated by said sewing machine for imparting step-bystep turning movements to said pattern-cam, and both said actuating means and said cam follower being disposed operatively to disengage said pattern cam upon axial movement of said pattern-cam in one direction.

2. A work-jogging attachment for a sewing machine comprising an attachment frame, a work-shifting member supported by said attachment frame, means defining a pivotal axis about which said work-shifting member turns with respect to said attachment frame, a cam'follower carried by said work-shifting member, an interchangeable pattern-cam, a shaft journaled in said attachment frame on an axis parallel to the pivotal axis of said work-shifting member, means carried by said attachment and adapted to be actuated by said sewing machine for imparting stepby-step rotary motion to said shaft, and complemental interlocking means formed on said shaft and on said pattern-cam, said complemental interlocking means and said cam follower being disposed for operative engagement with said pattern-cam upon movement of said cam axially of said shaft.

3. A work-jogging attachment fora sewing machine comprising an attachment frame adapted to be secured to said sewing machine, a work-shifting member, means defining a vertical pivotal axis for said Work-shifting member with respect to said attachment frame, a cam follower carried by said work-shifting member, an interchangeable pattern-cam, a shaft journaled vertically in said attachment frame, means carried by said attachment and adapted to be actuated by said sewing machine for imparting step-by-step rotary motion to said shaft, and

7 complemental interlocking rneans formed on said shaft andon said pattern-cam, said complemental interlocking means and said cam follower being disposed for operative engagement with said pattern-cam upon movement of said earn axially of said shaft.

4. A work-jogging attachment fora sewing machine comprising an attachment frame adapted to be secured to a sewing machine, a Work-shifting member, means defining a vertical pivotal axis for said work-shifting member with respect to said attachment frame, a cam follower carried by said Work-shifting member, an interchangeable pattern-cam, means carried by said attachment and adapted to be actuated by said sewing machine for imparting step-by-step rotary motion to said patterncam, an arrangement to facilitate interchangeability whereby said pattern-cam may be sustained by gravity alone in operative relation with both said cam follower and with said actuating means, said arrangement comprising, a shaft journaled vertically in said attachment frame, an upwardly extending free extremity formed on said shaft, means carried by said attachment and adapted to be actuated by said sewing machine for imparting stepby-step rotary motion to said shaft, and complemented interlocking means formed on said shaft and on said pattern-cam, said complemented interlocking means and said cam follower being disposed for operative engagement with said pattern-cam upon movement of said cam axially of said shaft.

5. A work-jogging attachment for a sewing machine comprising an attachment frame adapted to be secured to said sewing machine, a work-shifting member, means defining a pivotal axis for said work-shifting member with respect to said attachment frame, a cam follower carried by said work-shifting member, an interchangeable patterncam, means carried by said attachment frame defining a pivotal axis for movement of said pattern-cam, said axis being parallel to the pivotal axis of said work-shifting member with respect to the attachment frame, actuating means carried by said attachment frame and adapted to be operated by said sewing machine for imparting stepby-step turning movements to said pattern-cam, and a frame cover adapted to be secured to said attachment frame, said cover being formed with an aperture which is arranged so as to expose the axially projected crosssectional area of said pattern-cam, both said actuating means and said cam follower being disposed operatively to engage said pattern-cam when said cam is inserted axially through the aperture in said cover.

6. A work-jogging attachment for a sewing machine having an attachment frame, a work-jogging mechanism including a pattern-cam journaled for turning movement in said attachment frame, cam actuating means carried by said attachment frame and adapted to be operated by said sewing machine, and work-shifting means carried by said attachment frame and adapted to be driven by said pattern-cam, and a cover secured to said frame and arranged to enclose said work-jogging mechanism, said cover being formed with an aperture through which said pattern-cam is freely insertable into operative relation with said work-jogging mechanism.

7. A work-jogging attachment for a sewing machine comprising an attachment frame, mechanism carried by said attachment frame and adapted to be actuated by operation of said sewing machine for imparting jogging movements to said work, a pattern-cam carried for rotation with respect to said mechanism, said pattern-cam having an axis of rotation and being movable axially into and out of operative relation with said mechanism, a cover secured to said attachment frame to enclose said mechanism, said cover being formed with an aperture sized to exceed the axially projected cross-sectional area of said pattern-cam, and a lid member shiftably supported by said cover for movement into and out of a position spanning said cover aperture.

comprising an attachment frame, mechanism carried by 'said attachment frame and adapted to be actuated by operation of said sewing machine for imparting jogging movements to said work, means associated with said mechanism defining an axis for rotary movements of a pattern-cam, a cover secured to said attachment frame to enclose said mechanism, said cover being formed with an aperture arranged to expose a portion of said mechanism, a pattern-cam freely insertable through said aperture into operative relation with said pattern-cam axis defining means, a lid member shiftably supported by said cover for movement into and out of a position spanning said cover aperture, and means associated with said lid member for maintaining said pattern-cam in operative relation with said pattern-cam axis defining means.

9. A work-jogging attachment for a sewing machine comprising an attachment frame, mechanism carried by said attachment frame and adapted to be actuated by operation of said sewing machine for imparting jogging movements to said work, means associated with said mechanism defining an axis for rotary movements of a patterncam, a cover secured to said attachment frame to enclose said mechanism, said cover being formed with an aperture arranged to expose a portion of said mechanism, a patterncam freely insertable through said aperture into operative relation with said means, a lid pivotally supported on said cover for movement into and out of a position spanning said cover aperture, and spring means carried by said lid and disposed to engage and maintain said pattern-cam in operative relation with said pattern-cam axis defining means.

10. A work-jogging attachment for a sewing machine having an attachment frame, work-jogging mechanism including a pattern-cam journaled for turning movement in said attachment frame, cam actuating means carried by said attachment frame and adapted to be operated by said sewing machine, and work-shifting means carried by said attachment frame and adapted to be driven by said pattern cam, a cover secured to said frame and arranged to enclose said work-jogging mechanism, said cover being formed with an aperture through which said pattern-cam is freely insertable into operative relation with said workjogging mechanism, a lid pivotally supported on said cover for movement into and out of a position spanning said cover aperture, a spring member carried by said lid, a first arm on said spring member arranged to cooperate with said cover to provide a spring latch for maintaining said lid in a closed position spanning said cover aperture, and a second arm on said spring member formed to retain said pattern cam in operative relation with said cam actuating and work-shifting means when said lid is in closed position.

11. A work-jogging attachment for a sewing machine comprising an attachment frame, a work-shifting member, means defining a pivotal axis about which said work-shifting member turns with respect to said attachment frame, a cam follower carried by said work-shifting member, an interchangeable pattern-cam, means carried by said attachment frame defining a pivotal axis for turning movement of said pattern-cam, said axis being parallel to the pivotal axis about which said work-shifting member turns with respect to said attachment frame, actuating means carried by said attachment frame and adapted to be operated by said sewing machine for imparting step-by-step turning movements to said pattern-cam, and both said actuating means and said cam follower being disposed operatively to engage and to disengage said pattern-cam upon axial movement of said pattern-cam, and latch means carried by said attachment frame for restraining said pattern-cam in operative axial position with respect to said pivotal axis defining means.

12. In a work-jogging attachment having a means defining a pivotal axistfor a pattern-cam, a work-feeding member, and a cam-follower associated with said workfeeding member and movable in a path toward and away from the pivotal axis defined by said means, an interchangeable pattern-cam member, means formed at one side of said pattern-cam member adapted to cooperate with said pivotal axis defining means in said attachment, a handle extending from the opposite side of said patterncam member, and a cam surface formed on said patterncam member adapted operatively to engage said cam follower.

13. In a work-jogging attachment having a cam supporting shaft defining a pivotal axis for a pattern-cam, a work-feeding member, and a cam follower associated with said work-feeding member and movable in a path toward and away from the pivotal axis defined by said cam supporting shaft, an interchangeable pattern-cam member, said pattern-cam member being formed at one side with a cam supporting shaft accommodating bore, a handle extending from the opposite side of said pattern-cam member, and a cam surface formed on said pattern-cam member adapted operatively to engage said cam-follower when said pattern cam is disposed to embrace said cam supporting shaft.

14. In a work-jogging attachment having a cam supporting shaft defining a pivotal axis for a pattern-cam, a work-feeding member, and a cam follower pin associated with said work-feeding member and disposed to extend on an axis parallel to that of the pivotal axis defined by said cam supporting shaft, a pattern-cam member, said pattern-cam member being formed at one side with a cam-shaft accommodating bore, a follower pin accommodating cam groove formed in the same side of said pattern-cam member as said bore and a handle extending from the opposite side of said pattern-cam member.

15. A work-jogging attachment for a sewing machine comprising a frame, sewing machine actuated work-jogging mechanism including an interchangeable patterncam member, means pivotally supporting said patterncam member for rotation with respect to said frame, means for imparting rotary movement to said patterncam member and a work-feeding member driven by said pattern-cam member, means formed at one side of said pattern-cam member adapted to cooperate with said pivotal supporting means, a handle extending from the opposite side of said pattern-cam member, a cover for said work-jogging mechanism secured to said attachment frame, said cover being formed with an aperture arranged to expose the axially projected cross-sectional area of said pattern-cam member, and a lid member shiftably supported by said cover for movement into and out of a position spanning said cover aperture, said lid member being formed with an aperture arranged to expose said cam handle when said lid member is arranged to span said cover aperture.

16. A work-jogging attachment for a sewing machine comprising, a frame adapted to be secured to said sewing machine, a cam supporting shaft supported at one extremity in said frame, said cam supporting shaft having a free end portion presenting a first edge, an enlarged shoulder formed on said cam supporting shaft presenting a second edge, a pattern-cam having an axial cam supporting shaft accommodating bore formed therein, said bore being tapered to engage said first and second cam supporting shaft edges, means carried by said frame and adapted to be actuated by said sewing machine for imparting turning movement to said pattern-cam, a workfeeding member carried by said attachment frame, and a cam follower carried by said work-feeding member, said cam actuating means and said cam follower being disposed for operative engagement each with said patterncam when said pattern-cam is positioned to embrace said cam-supporting shaft.

17. A pattern-cam controlled work-jogging attachment for a sewing machine comprising an attachment frame including a substantially horizontally disposed base plate,

a ratchet wheel journaled on a substantially vertical axis on said frame base plate, a pawl disposed to cooperate with said ratchet wheel, means driven by said sewing machine for reciprocating said pawl to impart step-bystep rotary motion to said ratchet wheel, a hub on said ratchet wheel formed with an upwardly extending free extremity, an interchangeable pattern-cam member formed at one side with a bore adapted to accommodate the free extremity of said hub, a handle formed at the opposite side of said pattern-cam member to facilitate lifting and replacing said cam with respect to said hub, complemental interengaging surfaces formed on said hub and on said pattern-cam member providing a rotational interlock between said parts, a work-feeding member slidably pivoted with respect to said frame, and a patterncam follower carried by said work-feeding member.

18. A work-jogging attachment for sewing machines comprising an attachment frame including a substantially horizontally disposed base plate, a pawl carrier plate supported for translatory movement with respect to said base plate, a pawl pivotally secured to said carrier plate, means adapted to be actuated by said sewing machine for reciprocating said carrier plate, a ratchet wheel journaled on a substantially vertical axis on said base plate and disposed in operative engagement with said pawl, an upstanding hub formed integral with said ratchet wheel, an interchangeable pattern-cam member formed with a bore adapted to accommodate said upstanding hub, said hub and said pattern cam being provided with complemental rotationally interlocking surfaces formed for operative engagement upon a relative axial movement between said hub and said cam, a work-feeding member carried by said frame, and a pattern-cam follower carried by said work-feeding member and disposed for operative movement radially of the vertical axis of said ratchet wheel.

19. A work-jogging attachment as set forth in claim 18 in which said pawl is formed with a T-shaped aperture having a leg portion and a cross-bar portion, the leg portion of said T-shaped aperture extending radially from the pivotal axis of said pawl, a throw-out lever pivoted to said pawl carrier plate, a pin carried by said throwout lever and disposed to enter said T-shaped aperture, and means for shifting said throw-out lever to position said pin either within the leg portion of said T-shaped aperture so as to hold the pawl out of operative position, or within the cross-bar portion of said T-shaped aperture so as to accommodate operative vibratory movements of said pawl about its pivotal axis with respect to said carrier plate.

20. In a work-jogging attachment for sewing machines having an attachment frame, a shaft journaled in said attachment frame, a ratchet wheel fast on said shaft, work-jogging mechanism operated by turning movemeu ts of said shaft, and means for imparting turning movements in one direction to said shaft, said means including an actuator shiftably supported on said attachment frame, means adapted to be driven by said sewing machine for imparting vibratory movement to said actuator, a pawl member arranged to cooperate with said ratchet wheel, a pawl throw-out member, means pivotally securing said members to said actuator on spaced pivotal axes, said pawl and throw-out members being provided one with a projection and the other with a projection accommodating slot, said slot being arranged to extend radially of .the means pivotally securing said pawl to said actuator.

21. An attachment for a sewing machine of the type having an endwise reciprocatory needle bar and a depending presser bar having a hole drilled and tapped to accommodate a presser foot fastening screw, said attachment comprising a frame, a seat formed in said attachment frame to accommodate said depending presser bar, a fastening screw for said attachment adapted to be received in said tapped presser bar hole, a shank on said fastening screw formed with a necked portion of reduced diameter, aplate extending from said attachment frame in spaced relation to the presser bar seat therein, an aperture formed in said plate to accommodate the necked portion only of said fastening screw shank, and means facilitating insertion of said necked portion in said aperture to maintain said fastening screw captive with respect to said attachment frame, said means comprising a slot formed across said plate from said aperture to the edge of said plate whereby said aperture may be opened to admit the necked portion of said fastening screw and thereafter may be closed.

22. A work-jogging attachment for a sewing machine having an attachment frame, a Work-shifting member carried by said attachment frame, a pattern cam follower carried by said work-shifting member and having a free extremity, a pattern cam, mechanism actuated by said sewing machine for turning said pattern cam, said pattern cam being provided at one side with surfaces adapted operatively to accommodate both said cam actuating mechanism and said cam follower, said surfaces eing arranged to establish operative engagement simultaneously with both said follower and said cam actuating mechanism as said pattern cam is placed in operative relation with the free extremity of said cam follower.

23. A work-jogging attachment for sewing machines comprising, an attachment frame, a work-shifting member, means carried by said attachment frame for securing said work-shifting member in operative position, a cam follower carried by said work-shifting member, a pattern cam arranged to jog said work-shifting member, means carried by said frame defining a pivotal axis for turning movement of said pattern cam, mechanism actuated by said sewing machine for turning said pattern cam, a separable driving connection between said pattern cam and said mechanism for turning said pattern cam, and complemental separable interengaging means on said pattern cam and on said cam follower being-disposed relatively to said separable driving connection to accommodate bodily movement of said pattern cam into orout of operative engagement simultaneously with both said mechanism for turning said pattern cam and said cam follower.

24. A sewing machine work-jogging attachment com prising, an attachment frame, a work-shifting member, means carried by said attachment frame for securing said work-shifting member in operative position, a cam follower carried by said work-shifting member, a pattern cam arranged to jog said Work-shifting member, a pattern cam supporting member, means carried by said frame defining an operative position of said pattern cam supporting member and a pivotal axis for turning movement thereof in operative position, mechanism actuated by the sewing machine for turning said pattern cam supporting member, a separable rotationally interlocking connection between said pattern cam and said pattern cam supporting member, and complemental separable interengaging means on said pattern cam and on said follower being disposed relatively to said rotationally interlocking connection to accommodate bodily movement of said pattern cam into or out of operative engagement simultaneously with both said pattern cam supporting member and with said cam follower while both said cam follower and said mechanism for turning said pattern cam occupy operative positions with respect to the attachment frame.

References Cited in the file of this patent UNITED STATES PATENTS 887,503 Nelson May 17, 1908 979,537 Moore Dec. 27, 1910 1,893,912 Spaulding Jan. 10, 1933 2,619,925 Sharenow et al. Dec. 2, 1952 2,627,239 Enos Feb. 3, 1953 2,652,796 Russell Sept. 22, 1953 2,676,558 Enos Apr. 27, 1954

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