US2523586A

US2523586A - Sewing machine attachment

Info

Publication number: US2523586A
Application number: US584336A
Authority: US
Inventors: Robert B Myers; Donald E Craven
Original assignee: REVCO PRODUCTS
Current assignee: REVCO PRODUCTS
Priority date: 1945-03-23
Filing date: 1945-03-23
Publication date: 1950-09-26
Anticipated expiration: 1967-09-26

Description

R. B. MYERS x-:rAL 2,523,586

SEWING MACHINE ATTACHMENT Sept. 26, 1950 l Filed March 25, 1945 2 Sheets-Sheet Il v I F' Iws/vTo/s 46 74 l 6' Posa/v7' B. MYERS f -15 @cw/aw t'. Cem/EN A* r 60a, BY

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Sept. 26, 1950 R. B. MYERS Erm.

SEWING MACHINE ATTAcmlENT 2 Sheets-Sheet 2 Filed March 25, 19,45

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UNITED STATE-S PATENT OFFICE SEWING MACHINE ATTACHMENT' Robert B. Myers and Donald E. Craven, Whittier', Calif., assigncrs, by mesiie assignments, to Revco Products, Whittier, Calif., a corporation of California Application Mere-1123, 1945, serien Ne. 584,336

struction of the guide so that it may be rocked freely about its center to change its inclination from the horizontal and tip vit in either one direction or the other, the direction of movement of the feed dog is reversed, thereby reversing the stitch. Thus, as the channel guide is moved toward horizontal or neutral position, the stroke of the connecting rod is shortened and, hence, that of the feed dog, whereby the stitch in a given or forward may be accomplished at the election direction is gradually shortened, no stitch being of the operator. s produced at the neutral position, the direction of A further object of the invention is to provide movement of the feed dog and of the stitch being means of the indicated nature which will enable reversed as neutral position is passed when tipping' transition from one type of stitch to the other the channel guide in the opposite direction, the to be made by a relatively simple movement. length of the reversed stitch being gradually in- A further object of the invention is to provide creased as the angle of inclination is increased. for the conversion of conventional old model However, for Several reasons, the practical aS- backward feed machines to reverse stitch models pects of conversion are not so simple as merely without the necessity for effecting extensive adjusting the inclination of the channel guide. mechanical changes in the original construction, First, an actuating arn'l 0n the Channel guide and whereby the conversion may be made more engageable by the adjusting mechanism strikes or less readily merely by the replacement of certhe casting of the machine head so that it cannot tain original parts by adapters and new adjusting be adjusted beyond neutral position. Moreover, attachments. Y such reverse movement when imparted to the There are in constant usegreat numbersof old 'l5 feed dog Causes the feedV dog to Strike one end models of sewing machines which are equipped A' of its guide slot in the adjacent portion of the .with the old style conventional backward feed Work table 0r bed platemechanism by means of which the material being It is, therefore, a further object of this invenstitched is fed away from the operator. Most ef tion to make Such provisions and employ Such these models are capable of being converted to attachments as will adapt the present constructhe reverse stitch models by the installation of tions to conversion to reverse stitch without the attachments or adapters which can be relatively necessity for mutilation or reconstruction of the readily substituted for portions of the original Work table- In a preferred fOTm, this iS accomequipment. In some of these 01d mcde1s, espeplishod principally through the medium of an cially as produced by one manufacturer, a veradapter having an offset centering pin or guide tical connecting rod, which is known as a feed pin for offsetting the center of the guide roller fork connection, is employed to actuate a rocker Carried by the Connecting rod, and by replacing arm which causes a serrated feeder foot er feed the original channel guide receiving the roller by dog to be moved back and forth along the stitch a Channel guide free IOIn pI'OtrllSiOnS Which line, a cam mechanism being employed, incon- 4o would otherwise strike the casting forming the junction with a shuttle-actuating device, to raise InaChine head, whereby t0 permit ready adjustthe feed foot during its rearward travel and to ment of Seid guido upon a pivotal mounting by lower it during its forward travel toward the opwhich it is positioned in the head. ACCOrding t0 erator. The upper end of the connecting rod or a preferred form of the invention, the guide is feed fork connection is oscillated by means of a is adjusted through the medium of a shaft upon cam connected with the main drive shaft, and which it is Xed and which rotates in the pivotal during such oscillation the rod is cyclically raised mountingand lowered by means of a guide roller which it Other objects and features of the invention carries and which travels in an inclined adjustwill appear to those skilled in the art upon refable channel-shaped guide. This channel guide Breno@ to the fOllOWing SpeCiCatiOn and the aC- is conventionally adjusted to lengthen the stitch companying drawings wherein certain modificamerely by tilting the guide upon a pivot so as to tions are disclosed by Wai7 0f example. increase or reduce the throw of the connecting In these drawings, rod, Fig. l is a side elevation of a conventional old We have discovered that by modifying the cono5 style sewing machine head indicating applicathe head and the roller carried thereby with respect to the channel guide and the actuating means therefor;

Fig. '7 is chieiiy a front elevational detail, taken from the line l-T of Fig. 3, and showing a portion of the machine head broken away to reveal 'the position of the channel guide and the offset guide pin and its roller;

Fig. 8 is a front elevational detail similar to the showing of Fig. 7 illustrating a modified form of adjusting means for the guide;

Fig. 9 is a side elevation thereof, as indicated by the line 9-9 of Fig. 8;

Fig. 10 is a horizontal sectional detail, taken on'the line III-I0 of Fig. 1`1 and illustrating a further modied form of adjusting mechanism;

Fig. l1 is a front elevational detail similar to those of Figs. '7 and 8, as indicated by the line II-II of Fig. 10; and

Fig. 12 is a series of diagrammatic representations of different positions of certain parts of the stitch regulating mechanism, both of the old model machines and of the present adapter construction.

rIn Fig. 1 there is disclosed a conventional sewing machine head I5 which is in the form of a hollow casting supported by a work table I6. The usual hand wheel I1 and pulley I8 driven by a belt 4I9 are shown affixed to a conventional drive `shaft 28 which is provided with various eccentricsor cam mechanisms, one of which reciprocates a needle bar 2| carrying a needle 22, the bar 2I being located in the adjacent portion of I5 which supports a conventional presser foot 23 above a slot 24 in the work table I6.

The shaft carries a cam 25 which oscillates a fork or bifurcation 26 of a connecting rod 28 .otherwise known as a feed fork connection. The

lower end of the rod 28 is pivoted and supported at 2S upon a short arm 30 of a rock shaft 3l located below the work table I6. At the left end foot 23 when the latter has been placed in lowered position by well known means. The other branch of the yoke 33 carries a pin or roller 35 (Fig. 2) which engages in a cam `groove of a cam 36 operated from the drive shaft 20 in conjunction with a shuttle in a well known manner by means not shown. The cam 36 is transversely reciprocated with respect to the showing of Fig. 2 so that the feed dog 34 is raised in the conventional manner up through the slot 24 into fabric engaging position as the feed dog is moved rearward by the yoke 33, the feed dog being drawn down below the work table I6 by the cam 36 during movement of the feed dog forward.

It is the purpose of the attachment of the present invention to enable the relative movements of the feed dog 34 with respect to the movements of the cam 36 to be reversed at will, so that the feed dog may be caused to move forward in reverse stitch relationship when the cam 36 raises it up into fabric engaging position, the feed dog being then drawn down below the table I6 by the cam 36 to disengage the fabric as thc yoke 33 prepares to drive the feed dog 34 rear- Ward.

The normal vertical movement of the connecting rod 28 to effect the described movements of the rockshaft 3I, the yoke 33, and the feed dog 34 is effected through the Vmedium of a guide roller 40 pivoted on the rod 28 and operating in a tiltable channel guide 42 pivotally mounted in a bearing 43 inthe head I5 by being fixed upon a shaft 44 rotatable in the bearing 43.

In conventional construction and practice, the guide roller 40 is pivotally mounted on the connecting rod 28 by a short, straight pin secured in an aperture in the connecting rod, the axis of the roller being on the center line of that aperture, whereas, for the purpose of the present invention, an adapter 45 is employed to mount the roller. This Aadapter comprises an offset centering guide pin 46 which directly carries the roller v46 and is fixedly supported by an offsetting plate 48 which in turn flxedly supports an anchoring shank 50 which is secured in an aperture 52 in the connecting rod 28. This aperture 52 is the aperture originally provided to carry the roller 48 and receive the short, straight pin above-mentioned. A convenient means for mounting the adapter 45 in the aperture 52 of the connecting rod 28 is that indicated by threads 54 on the end of the shank 50 to Which a nut 55 or other locking means is affixed for binding the offsetting plate 48 against the opposite face of the connecting rod 28. The plate 48 also serves as a thrust bearing for the roller 48, which in turn causes the plate 48 to clear the edges of the channel guide V42.

The extent of the offset between the centering pin 46 and the anchoring shank 5U is such as to align the center of the roller 40 with the center of the channel guide 42, which is the axis of the shaft 44, when these parts are in middle or neutral positions. In practice, the amount of the offset between centers is small, being approximately one-eighth of an inch, and with the centering pin 46 disposed at an angle of about 15 upward and to the left with respect to the shank 50, as the parts are viewed in Figs. 2 and 12, desired relationships between all of the actuating mechanisms for the feed dog 34 and stitch-regulating mechanism are obtained. The exact distance and angle vary somewhat with different models.

The respective relationships and paths of movements of the feed dog and of the stitchregulating mechanism of both the old model conventional device and of the present construction employing the adapter 45 are diagrammati- `cally indicated by the various positions of Fig. 12. Position A illustrates the direction of inclination of the channel guide 42 in a conventional old model device wherein the feed vdog 34 moves rearward from the operators position at the front of the work table I6, the path of movement ofthe feed dog 34 for a maximum length stitch being indicated by the arrows. The feed dog 34 rises into operative position at a point closely adjacent the front wall of the slot 24 for all'stitch lengths. f Y l `..Position B indicates adjustment of the old model channel guide 42 to an approximately horizontal position, wherein the length of stitch reduces to Zero, beyond which, if the guide 42 could be further tipped,v there would be a,tend, ency toward a reversed stitch position. Such a movement would, as indicated by arrows `in vthe drawing, cause the forward edge of the feed dog 34 tostrike the adjacent edge of the work table [6 at the front of the slot 24. Also, in attempting toVV attain such a position of adjustment, a depending .actuating finger 42a onthe conventional channel guide 42 strikes an obstructing portion 5l constituting the adjacent portion of thecasting forming the machine head l5.

employing the attachments and adapter of the `present invention, a channel guide 42 is employed-invwhich the part 42a is eliminated, in

ordenthat the guide 42 may be freely tipped to provide inclination in any direction. However, provision for `i'reerotation of the guide 42 is not suflicient because, as just indicated, the feed dog 34 will strike the adjacent end of the slot 24.

Position C indicates `therelationship of the parts and the path of travel of the feed dog 34 when the adapter 45 is employed so as to shift the axisof. rotation of the roller 40 into alignment with the axis of the shaft 44fcarrying the channel guide 42, when the yoke 26 of the feed fork connection or connecting rod 23 is positioned in its middle or neutral position` by the cam '25, Such alignment oftheraxis of the roller 43 with the axis of the shaft 44 permits tipping of the channel guide 42 to either one side or the other in order to., reverse the stitch by reversing` the direction of vertical movementy of the rod 28 u pon throw to a given side'by the oscillating cam 25. The disposition of the pin 46 upwardat a small angle from the position of the aperture 52, serves to depress the connecting rod 28 correspondingly so that the resultant lowering'of the pivot 29 at the lower en d of the rod 28 changes the timing andthrow of the feed dog 34 in such "manner as to avoid striking the front end of the guide slot 24.

*"InV all of the positions'indicated in Fig. 12, the lcenter of rotation ofthe channel guide 42H upon the shaft 44 is shown on the same center line 58 fgrtherpurpose of indicatingthe relative shift of "the axis of the centering guide pin 46 from the location of the axis of theoriginal aperture 52; The location of the axis'of the aperture 52 is represented'by the line 59. This shift of the axis of the pin 45 causes the dog 34, when the guideV 42 is set for rearward feed (which position i-sfindicated also by the broken center line C of FigfS), to rise into operative position in the slot 24V-atapoint clear of the-front end of the slot -24 and subsequently to fall at a point clear of the rear end of the slot 24, approximately as indicated-by thearrows in Position C, thereby avoiding'all contact of the dog 34 with the ends of the-slot. U 1 f Position D of Fig. 12 indicates the adjustment of the channel guide 42 when the adapter 45 of `the present improvement is used, whereby to yield forward movement of the feed dog34. As` in Position C,the.axi'sof `the guide pin 46 is aligned is in Vitsmiddle or neutral position. Position also represents the feed dog 34 as being caused to feed the fabric forward, as indicated by the arrows, thereby reversing the stitch from the normal rearward stitch, the path of the feed dog being entirely within the slot 24 and clearing both ends thereof, as in the case of the rearward stitch indicated by Position C.

Thus, by employment of the adapter 45, and by eliminating the nger 42a of the old form from the guide-42 in the present form, the guide 42 may be freely adjusted between the extreme positions represented by the broken center lines C and Dof Fig. 3 and on either side of the neutral or ineffective position represented by the broken center line E of Fig.3. The feed dog 34 is thereby causedto fee'd either backward or forward, and to .move up and down to and from feed position Without striking the Work table I6 at the ends of the slot 24,. s

Since thes'direction of movement of the feed dog through the feeding portion of its path is governed by the direction of inclination of the lchannel guide 42, and since the length of stitch in either direction is governed by the degree of inclination of the channel guide 42 in the respective direction, the latter serves both as a feed regulator and a stitch reverser. -Selection of the direction of stitch and of the stitch length isthereforemreadily accomplished by tipping of the guide 42`,tokwar d thepostion. ofthe broken line C or toward the position ofthe broken line D of Fig 3 through the medium of rotary adjustment of the shaft 44 upon which it is fixed. This adjustment maybe accomplished' by various mechanisms, the constructional features of which are governed somewhat by the exact construction of the original machine head l5 upon which the adapter 45 and attachments of the present invention are installed, or by the location of the conventional bobbin Winder, `or the like.v

In the form of adjusting mechanism shown in Figs. 1,' 2, `3 and 7, an arm G0 is xedly secured tothe rotary shaft 44 as by means of aset screw Ella, the swinging end of the arm 6l! having pivoted thereto at 6l a link 62 which is pivotally` connected at 63 tov one end of a bent lever t4 mountedV onra `xed fulcrum and lcarrying at 'its outer extremity means for manipulating the lever 6.4, such as a knurled head 56 of a screw El. The fulcrum' 65 is` provided by a gauge plate 68 which, in the form shown, is secured to the head l5 by a relatively large countersunk screw 63 threaded into athreaded aperture lil originally found in the head l5 and originally receiving screw `means for adjusting a channel guide corresponding with the channel guide 42. The gauge plate 68 .is provided with a rearwardly extending extension l'l in which the fulcrum E55 is located. The screw 61 is employed as a means to limit movement of the bent lever 64 .to various adjusted positions such as indicated in Fig. 3. For this purpose thescrew 61 has a pointedend 12 adapted to strikethe gauge plate 68 above and `.below the middle of a scale 'I3 when the lever B4 is moved upand down to reverse the stitch. This movementto produce stitch reversal may be made Without stopping the` machine. For a given setting ofthe screw'l in the lever 64, the extent 0f throwiofuthe lever 64 downward will be the same as the extent of its throw upward. The amount oflthrow in either.v direction is varied by adjusting r the screw 57, thestitch length lbeing corres -spondingly varied'.- L i 'The setting of the arm 64 may be maintained by any suitable means, that shown being a conventional spring washer v'I4 carried on the shaft 44 and compressed between the arm 69 and the portion of the machinehead I which provides the'bearing` 43. The frictionalresistance thus provided is adequate for the purpose.

With the form of attachment as shown in Figs. 1,=2, 3 and '7, the raising and lowering of the outer end of the bent lever 64 about its fulcrurn 65 cause the armr 60 to be correspondingly moved through the medium of the link 62, thereby rocking the shaft 44 and producing corresponding adjustment of the channel guide 42 on eitherside o f the position of the neutral line E toward either of they extreme positions of inclination represented by the broken lines ,C and D of Fig. 3, such as illustrated by Position C and Position D of Fig. 12'. "Such tipping ofthe guide 42v from one side of neutral to the other reverses the vertical movement 'of the guide vroller 4U on a given Ylateral movement of the fork 26 by the cam 25.

v`A simpler form of attachment for adjusting the channel guide 42 may sometimes be'used, as shown in Figs. 8 and 9. Here, an arm'15 is secured to the rotary shaft 44 as by means of a set screw 15a, the arm*A I5 extending forwardly and being provided at its free end with a laterally disposed portion which carries the knurled head 56 and its screw 61 whose pointed end 'I2 cooperates with a gauge platel secured to the machine head I5 by a countersunk screw I'I threaded into a hollow screw 'I8 which ris in turn mounted in the threaded aperture I9 originally provided in the head I5. The pointed end 12 of the screw 6l strikes the gauge plate 'I6 for limiting movement of the arm 'I5 when reversingr the stitch, and cooperates with a scale 'I9 on the plate 'I6 for adjusting the length of stitch in substantially the same manner as with the form of Figs. 3 and 7.

Another form of attachment which may be employed is shown in Figs. and 11. In this form, the arm 60 of Fig. 3, which is mounted on the rotary shaft 44 is connected by a ball and socket joint 80 to a two-part link 8| which has at its opposite end a vsocket for a ball 62 formed on one end of a pin 83 mounted in an adjacent offset end 84 of another arm 85 which is secured 21S by means of aset screw 85a to a rock shaft 36 journa-led in a sleeve 88 which is partially threaded at 89 and mounted in the threaded aperture 'I0 originally provided in head I5. It 'will be noted that the arm 85 extends laterally from the link 8| into the cavity within the head I5 through an access opening 90 originally provided in the side of the head I5 for the purpose of assembly, this opening 99 and another large opening (not shown) conventionally provided at the backof the head being used for the purpose of installation. The forward end of the rock shaft 86 carries ian actuating arm 92 by means of which the shaft 26 is rocked to operate the arm 85 and the link 8|, and thereby adjust the arm 60, the rotary shaft 44 and the channel guide 42. Cooperating with the actuating arm 92 is a gauge plate 94 suitably held in position against the machine head I5 as by means of a flange 68a carried by the sleeve 88. The gauge plate 94 is provided with a triangular opening 95 which receives a sliding stud 96 having an extension 9'I. A portion of the extension 9'I is squared and slides in a slot 92a in the arm 92, and a portion of the extension 91 is threaded to receive an internally threaded knurled nut 98. "The squared portion of the extension 9'I prevents the threaded -portion fromv turning in the slot 92a, whereby the nut 98 may be ,bound against the arm 92 in cooperation Awith a flange 99 integral with the stud. 96 and by which the stud 96 is bound against the opposite side of the arm 92. loosening "the knurled nut 98, the stud 96may be moved along the arm 92 in its slot 92a, thereby 'correspondingly adjusting the stud 96 inthe opening with respect to the inclinedA sides of the opening 95 which converge to a point short of the rock shaft 86. By reason of the indicated angle of divergence of the mentioned sides of the opening 95, the stud 96 may be swung through a larger arc when the stud is carried on an outer portion of the arm 92 and through'a smaller arcV -when the stud 96 is carried on an innerportion of the arm 92, substantially no arc being-described when the stud 96 is disposed in' thefinnenmost"endv of the slot' 92a. In this manner the length of stitch may be regulated as desired, andA the stitch may be reversed, without' stopping they machine, merely by swinging ther arm 92 from one side of the opening 95 to the other until the stud 96 strikes the corresponding edge ofthe opening 95.

The operation and vfunctions of the Various parts of the adapter 45 and the described attachments for adjusting the channel guide 42 have been outlined aboveA incidentally to the description of the construction ofthe parts. To recapitulate, when the adapter 45 is installed on'thej connecting rod 28 with the anchoring shank 5|] bound in the aperture 52 by the nut 55, the location of the offset stud pin or guide pin' 46 carrying the guide vroller 49 is upward andY to the left of ythe aperture 52, as viewed in Figs. 2, 6 and 12. 'This position of the pin 46 is such that its axis is aligned with the axis of the rock shaft 44 carryingthechannel guide 42 when the cam 25 is at its neutral or zero position, as shown in Fig. 2 so that the fork or yoke 26 of the connecting rod 28 is centered in its Zero or neutral position.

Thus, the center of the pin 46 and its guide roller49'is shifted to the left in the guide channel 42 with respect to the position of the axis of the guide roller l4I! as originally carried on the axis'of thev aperture 52. As a consequence, the connecting rod 28 is correspondingly lowered'in the forwardstitch cycle, thereby preventing the feed'dog 34'` from striking the front edge of the slot'24, andthe connecting rod 23 is correspondingly raised during the reverse stitch cycle, thereby preventing the feed dog 34 from striking the rear edge of the slot 24. Such a shift in relationship causes the raising and lowering of the feed dog 34 at the limit of its forward stroke to occur at Aa, position well within the slot 24, as indicated in Position C of Fig. l2, thereby avoiding striking of the forward end of the slot 24, as would be'done in Position B. The lateral shift of the guide pin46Y with respect to the aperture 52Yto align the'aXis of the pin 46 with the axis of the shaft 44 when the cam 25 and yoke 26 are in their neutral positions, as in Fig. 2. so changes its relation and that of the guide roller 46 to the center of rotation of the channel guide 4'2 that the tipping of the channel guide 42 in one direction, such as downward and to the right in Position C (and as represented also by the broken lineC of Fig. 3), causes the vfeed dog 34 to feed in a given direction, that is rear- 'wardas in Position C. Also,v tipping -of y the channelguide 42 inf/the opposite direction, as in Position D (represented also by the broken line v"atopposite ends'of the cycle of movement of the camm36- so that the'rraising and lowering movementsof the feed dog' 34byftlie cam 36 are reversed -with respect to the ends of the feed stroke of the feedndog. i

The lengthof stroke ofthe feed dog- 34 tovary the length of stitch in either direction is varied merelyby changing thev inclination of the guide channel 42 in the respective direction-having reference tothe Verfecipive longitudinal axis oi the connecting rod 28 which is represented in Fig. 12 by the center line 58.

Other means of shifting the position Vof the guide pin 46 for the roller 40 may be employed, for example, by otherwise xedly securing the pin 46 to the connecting rod 28 in the relative position described, such as by welding, or by casting a new rod 28 With the pin 46 properly located by integral formation, or by casting a new rod 28 with the aperture 52 properly located for threadedly or otherwise receiving the pin 46. In practice, the amount of shift of the guide pin 46 is so small that a new seat therefor cannot be drilled in the connecting rod 28 at the side of the aperture 52.

Various other modifications of the generi-c invention herein disclosed will become apparent to those skilled in the art and it is intended to cover all such variations as fall within the scope of the appended claims.

We claim as our invention:

'pivotally mounted.

said .means for rotating said stem comprises:

"an arm xed vupon said stem; a link attached to said arm; and a lever having one end connected with said link and adapted Vto adjust said link and arm.

4. A'combination according to claim 2 wherein said means for rotating said stem comprises: an arm fixed upon said stem; a link attached to said arm; a lever having one end connected with said vlink and'A adapted to adjust said link and arm;

and a gauge plate upon which said lever is 5. A combination according to claim 4 wherein said lever and said gauge plate have cooperating means for setting` said lever in adjusted position with respect to said gauge plate.

I ,6. A stitch-reversing attachment for sewing ,fhrrnachhinea comprising in combination: a channel-shaped guide adapted to receive stitch-regulating means tobe guided; a stem rigidly securedtdsaid'guide Afor rotatably mounting'the latter Aaifli adapted" to be journalled in `'a 'sewing l. Attachment mechanism for a sewing machine to provide for stitch reversal, comprising in combination: an adapter including a centering guide pin adapted to receive a guide roller and having an` offset shank adapted to be xedly mounted in an aperture in a feed fork connection of the sewing machine; a rocking channel guide adapted to be tipped to positions on opposite sides of a neutral position and toreceive said guide pin and a guide roller carried thereby; a pivoting shaft rigidly secured to said channel guide and adapted to be rotatably mounted in and to project through the sewing machine head; and an actuating arm adapted to be xedly secured to a projecting portion of said shaft for tilting said guide by way of said shaft.

2. Sewing machine mechanism, comprising in combination: an adapter including a guide pin and an offset shank connected to said pin and adapted tomount said pin in a position eccentric to said shank; guide means supported by said guide pin; a rotatable straight wall channel guide adapted to receive said guide means and rotatable to opposite sides of a neutral position; a stem rigidly secured to said channel guide and adapted to mount the latter rotatably in a support with an end of the stem projecting beyond its support; and means secured to said end of said stern and adapted to be moved to rotate said stern and said channel guide for tilting said guide laterally through said neutral position and in opposite directions with respect to said neutral position. l

3. A combination according to claim 2 wherein lll) machine head; an arm rigidly secured to said stem for adjustably tilting said guide through rotation of said stem; a link connected with said arm to actuate the latter; a lever connected with said link; a gauge plate; means pivotally mounting said lever'with respect to said gauge plate; and adjustable stop means cooperating with said lever and said gauge plate for producing equal adjustments of said guide to opposite sides of a neutral position upon lever movements in opposite directions.

7. A combination according to claim 6 including: means cooperating with said lever for maintaining adjustment of said lever and said guide; and means for mounting said gauge plate upon a sewing'machine head adapted to be threaded into a threaded opening originally provided in a sewing machine head adjacent a mounting for said channel guide.

8. A stitch-adjusting attachment for sewing machines, comprising in combination: channel guide means adapted to receive stitch-controlling means to be guided thereby, and including a stem for rotatably mounting the guide means on a sewing machine head; an arm rigidly connected with said guide means for adjustably rocking said guide means about the axis of said stem; a movable actuating member for said arm and adapted to be actuated from outside said inachine head; and a link connecting said actuating member to said arm to actuate the latter and Vlating means on said pin; channel guide means adapted to be rockably mounted on a sewing machine head and adapted to receive said guided regulating means to guide the same; an arm connected with said channel guide means for rocking said channel guide means upon its mounting; a link attached to said arm to actuate the latter; and an actuating member adapted to be manipulated by an operator of the sewing machine and attached to said link to transmit movement through said link to said arm for rocking said channel guide means.

Y 10. A stitch-adjusting atta-chment for sewing machines, comprising in combination: adjustable' channel guide means adapted to receive stitch-controlling means to be guided thereby, and including a stem for rotatably mounting 1 l the guide means on a, sewing machine head; an arm rigidly connected with said guide means for adjustably rocking said guide means about the axis of said stem; a movable actuating member connected with said arm to actuate the latter and adapted to be actuated from outside said machine head; a mounting member adapted to be mounted upon said machine head and carrying said actuating member; an adjustable device carried by one of said members for control o relative movement between said mounting member and said actuating member; and spaced stop means provided by the other of said members and adapted for engagement with said adjustable device upon relative movement of said movable member through `a neutral position between opposite limits providing reverse and forward stitch respectively, said spaced stop means being equidistantly disposed on opposite sides of said neutral position of said movable member to limit movement of such movable member equivdistant-ly in opposite directions and provide corresponding movement of said adjustable guide means to produce equal lengths of forward and reverse stitch at a given setting of said adjustable device.

ROBERT B. MYERS. DONALD E. CRAVEN.

REFERENCES CITED The following references are of record in the le of this patent:y

UNITED STATES PATENTS