US2145823A - Peeding mechanism for sewing machines - Google Patents

Description

.Jan. 31, 1939. I J. P. WEIS ET AL 2,145,823

' FEEDING MECHANISM FOR SEWINGMACHINES Original Filed Sept. 24. 1934 4 Sheets-Sheet 1 A TTORN IN-VENTURE .7072 Pilfizeimy J 3 J. I WEIS ET AL: 2,145,323

FEEDING MECHANISM FOR SEWING MACHINES Original Eiled SeptJ 24, 1915 4 Sheets-Sheet 2 YATTORNEYX w Jan. 31, 1939. 1 P, wa ET AL 2,145,823

FEEDING MECHANISM FOR ,SEWiNG mcnnms Original Filed Se t. 24, 1934 4-,Shgets-Sheet 3 INYENTQRJ d Jahz 73 l/Qz: y fwnaz m ZITORNEYX 7 Jan. 31,, 193.9. J; P. was ET AL I FEEDING mscmursm FOR SEWING momma;

Original Filed Sept. 24, 1934 4 Sheets-Sheet 4 my. 6' 29 156 F y 7 4/152 1 v 756' v 56' F7 9.

v I sm'cuss 15 /2 PER 44' S men 1 I53 {54 15%. ZFTORNEY? 20 even at very highspeeds.

Patented Jan. 31, 1939 UNITED. STATES PATENT OFFICE FEEDING MECHANISM FOR SEWING MACHINES John P. were and Frederick E. Zeier, Nyack, N. Y., assignors to Wilicox & Gibbs Sewing Machine Company, New York, N. Y., a corporation of New York Original application September 24. 1934, Serial No. 745,343. Divided and this application October-11, 1934, Serial No. 747,871

29 Clalms. (01.112-210) The present invention relates to improvements -l with this object include the provision of sturdily supported feedlifter and rocker rods extending longitudinally of the machine from a thoroughly lubricated point within the trunk of the machine to a point at the opposite end of the machine close to the feed dog and its main supporting parts.

A complementary feature includes novel short driving connections between a main drive shaft and the lifter and rocker rods so that there is a minimum of inertia when operating the machine,

The feeding mechanism of the present invention, associated with a centrally disposed main drive shaft, facilitates manual manipulation when the operator desires to condition the needle, looper, and feeding mech-' anism.

It is another object of the present invention to provide a feeding mechanism having a wide margin of adjustability, so that a change-over from coarse to fine stitch feed may be easily and quick- '30-1y made, and to do this without guessing.

a transparent indicator -plate,. preferably built into the base of the sewing machine, with a fully enclosed pointer aligning with a graduated scale on the indicator plate in a manner to closely indi-' cate to thefoperator the exact number of stitches per inch.

Other objects, features, and advantageswill-ap pear hereinafter: v

In the drawings: Figure 1 is a sectional view taken longitudinal through the complete sewing machine of the present invention.

Fig. 2 is 'a transverse sectional view taken' through the working or head end of the machine, on line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view through the trunk end of the machine, taken on line 3-3 in Fig. 1.

Fig. 4 is a horizontal sectional view, taken on line 4-4 in Fig. 1.

Fig. 5 is a top sectional view taken on line 55 in Fig. 1 and shows the cloth'plate removed.

Fig. 6 is a detail view, on an enlarged scale, of the feed. adJusting mechanism. Fig. '7 is a front view of the feed adjusting mechanism shown in Fig. 6.

Fig. 8 is a fragmentary sectional view of the mechanism shown in'Fig. 6, taken on line. 88

therein. r

Fig. 9 is a detail view; of the transparent stitch indicator plate and scale.

The present invention is not limited to the details of construction and arrangement of parts illustrated in the accompanying drawings since the principles of the invention are capable of other embodiments and the phraseology employed is for the purpose of description and not for limitation.

Referring now in detail to the drawings, the

sewing machine of the present invention includes a frame l2 comprising a hollow trunk lit for supporting a main driving mechanism I4, with a preferably hollow and integral upper arm l5 supporting a needle operating mechanism It, and a preferably integral lower arm I! for supporting looper and feeding mechanisms. i8 and i9 respec-- tively and for forming a work support 20. In

general it has a smooth outer finish for appearance, ease in cleaning, and elimination of all outward obstructions which would interfere with handling the work. i

The hollowed trunk l3 compr ses a front wall 21, rear wall 22 and side walls 23 and 24. the latter having large side openings 25 and 26 respectively to accommodate and support the main driving mechansm It. Further, the trunk I3 is provided with a top opening 21 and a bottom opening 20 large enough to pass various operating parts and to receive the hands of a person making the original assembly or making subsequent repairs and adjustments. A cover plate 29 and 9.

tom openings 21 and 28 respectively, and are held in place w th screws 29' and 30 in the usual manner. End caps 3i and 32' are similarly held against the side walls 23 and 24 respectively by screws II and 32' to make a complete oil tight closure for the main operating parts. These openings and caps permit bench assembly of the bottom plate 30 are provided for the top and botoperating parts contained in the trunk of the ma chine and facilitate assembly thereof by making it possible to pass the main driving mechanism I4 or large sub-units thereof through the various openings. When the caps are secured thereto an effective seal is provided which prevents leakage of all while the machine is in operation.

The main driving mechanism herein briefly disclosed and described is more completely disclosed and described in our copending application Serial No. 2,806, filed January 21, 1935.

The upper arm I5 is preferably made with a substantially hollow chamber 33 and may be of substantially rectangular and tapering cross section, with a transverse web 34 at the trunk end, and a similar transverse web 35 near a head 36 at the end of the arm, to support a main rock shaft 31 of the needle operating miech anism I6. The head is provided with suitable bearings 38 and 39 for a needle bar 40 and a presser bar H, see Figs. 1 and 2, and is provided with a large opening 42 to facilitate adjustments and repairs to the parts therein. This opening is normally closed with a cover plate 43, held in place by screws 43', to cover up the working mechanism and to prevent adverse escape of oil.

The lower arm I1 is-preferably made integral with the frame I2, with a front wall 44 and a rear wall 45 extending horizontally from. the trunk I3 in a direction parallel to and underlying the upper arm I5. In order to make these walls rigid or sturdy at the outer extremities, and in order to provide suitable bearings for important operating,parts,.an end wall 43 is provided at'their outer extremities and a shorter trans verse web 41 is provided intermediate the end wall 46 and the sides of the walls, 45,-and' 23. Thus, the lower arm H provides a sturdy nonvibrating support for both the feed mechanism 45 to form a support for the long and large area cloth plate-53, which may be secured thereto by screws 5'l entering tapped holes 51, or may likewise support a small area cloth plate 53 inthe latter being secured to the adaptor by screws 6| threaded into holes 6|. Interchangeable throat plates may be provided with various cutouts to accommodate various stitching combinations, diflerent widths of needle gauges for light and heavy work, and various feeddogs. The

main-purpose of the adaptor" is to make pos- ,sible the use of a thick cloth plate 56 with relatively thin throat plates 48, both resting upon the same bosses and more particularly to form a clearance for loopers 62, and feed dog 63, see Figs. 1, 2,and5. A g

It also forms a rigid support for the throat plate to prevent deflection under heavy pressure from the needle when operating on heavy mate-' rials, and prevents deflection under heavy pressure of the presser foot. In addition, this arrangement of parts is such that the change over from the wide clothplate 56 to the narrow cloth plate 58, and in effect the change from a flat bed to a cylindrical machine, may'be eiIected without disturbing the throat plate which is desirable when there is a criticaladjustment between the throat plate, feed dogs, and the needle guide. Also, it is possible to remove or change the throat plate 49, without disturbing the cloth plate, when it is desired to make repairs, changes, or adjustments to the feed dog or loop forming instrumentalities located in the lower arm I'I.

The novel lower arm I'I, interchangeable work supports 20, the ready interchangeability of the throat plates 49 without changing the cloth plates 53 or 58, briefly described herein, and a novelneedle guard and loop spreader associated therewith but not illustrated or described herein, form the subject matter of a continuation in part application Serial No. 750,259, filed October 2'7, 1934 and in our divisional application Serial No. 185,886, filed January 20, 1938. Brief, rather than detailed description relative thereto has been given herein in order to'facilitate describing and understanding of the novel feeding mechanism which forms the main subject matter and claims of the present patent application.

The main driving mechanism I4 is described herein, in connection with only the transverse looper 62, illustrated in Figs. 1 through 5, although the novel feeding mechanism of the present application is equally applicable for use with the longitudinal and universal type loopers fully illustrated and-described in the aforementionedv application of which this is a. division. It comprises a main drive shaft 64 with cranks A, B, C,

D,'and E, and each preferably formed in the shape of a ball, as shown in Fig. 7 accommodating main. driving connections including crank arms 85, 66, 61, 68, and 39 respectivelyprovided .with ball and socket connections III, II, I2, I3,

,and I4 (see Fig. 1) in order to allow the crank arms to rotate relative to the balls and to permit slight vertical displacement to compensate for slight irregularitiesin the location of those parts which connect with and-are operated .by the other end of the crank arms. Integral plates I5 relnforcethe main drive shaft 64 between the individual. cranks.

The crank arms 55-459, are preferably provided with ball and socket and like connections I3, I], I8, 19, and 80 respectively jor connection to an arm 8|, bell crank 82, arms 83 and 84, and link 35.at their ends opposite the main drive shaft, for driving the needle operating and other mechanisms 'all in a mannerabout to be described.

The main drive shaft 64 together with the main driving connections I4 including the crank arms and associated ball and socket connections,

bell cranks, and arms just described may beassembled extraneously of the frame and may then be passed through the side wall opening 2t into the chamber I3 of the hollow trunk I3 for assembly.- These assembled parts; just described are moved into the chamber whereupon the main shaft may again be moved into a horizontal plane substantially central of the side wall openings 25 and 26 where it is supported by 7o in detail, are tilted slightly and the crank arms bearings 99 and 91 and held in place by the caps 9I and 92. A main drive pulley 99, is secured times when the handwheel is close to the base of the machine, and without danger of awkward twisting of the arm as is required when the hand wheel is on the'front of the machine. Further, and of particular importance, it makes possible the use of short crank arms to the various mechanisms, thereby overcoming vibration and inertia of moving parts to a very marked extent. This latter factor is enhanced by having the main drive shaft parallel the rocking and reciprocating rods of the various associated mechanisms. All of these advantages will be more apparent after the individual mechanisms are described.

The needle driving mechanism I9 comprises the rocker rod 91 journaled in bearings 99' and 95 in the walls 99 and 95 respectively. with an arm 9| secured to the trunk end thereof by a yoke 9I and having a bearing stud 99 at its the looper 92. This arm is connected to a hollow needle bar 99 through a double link 92 and link,

pin connections 92' (see Fig. 2). At its lower end the needle bar, is adapted to interchangeably receive various types of needles 99 in the conventional manner.

As may be seen best in Figs. 2 and 4, a stud 99 is provided with a finger 95 extending through an opening 95' at the front of the head, and exteriorly of the latter is provided with a thread carrying eyelet 99. This finger is in the form of a slide adapted to ride between plates secured to the head 39 in spacedrelation. This latter structure insures a sturdy driving action between the arm 9I and the needle bar 99 and also insures an eillcient drive for the thread carrying eyelet 99 which forms a slack for the formation of succeeding stitches. One vertical reciprocation of the needle downward and upward by the crank arm 99 is accomplished each time the crank on the main drive shaft 99 is given a complete revolution.

As shown in Figs. 1 through 5 particularly, the

looper mechanism I9 includes a looper carrier 91 movement in bearings I99 in the trunk and in the lowerarm I1. The collar'is heldagainst axial movement thereon by thrust collars I99 after thelooper 92 is properly located with respect to the needle 99.. Spacing between the collars I99 is. just enough to prevent adverse axial u movement of the collar 99 on the upper rod I99,

yet sufficient to permit a free rotating or rocking movement thereof on the rod.

In order to move the looper 92 relative to the needle in an elliptical path in the usual and well known manner to form a Federal Standard Stitch, Style I, the looper carrier 91 is provided with a double pivot connection 99 and I99 to upper and lower rods I99 and I 91 respectively provided with driving connections I99 and H9,

see Figs. 1 through 5. The connection I99 for the upper rod I99 includes the crank arm 99 having the ball and socket connection H with the crank 18 on the main drive shaft 99 and with a ball and socket connection 11 to the bell crank 92 and socket connection 12 with the crank C on the main drive shaft 99 and having a ball and socket connection 19 to the front end of the arm 93 secured to the lower rocker rod.

Reciprocationof the upper rod I99 moves the looper 92 from the'solid line to the dot-and-dash line position and vice versa, shown in Fig. 1, and rocking movement of the lower rod, I91 moves the looper from solid line to the dot-and-dash line position shown in Fig. 2, all in timed relation with reciprocation of the needle 99. The lower rocker rod I91 is held in desired position lengthwise of the bed by collars I99 engaging bearings I99. The upper rod I99, however, is not held against endwise movement since it must be reciprocated in the bearings I99 in order to impart rocking movement to the looper carrier 91. 7

Since there is only a comparatively short crank arm connection between the cranks and the upper rod and lower rod, very little inertia is developed so that the parts may be operated at a very high speed. This operating advantage is also enhanced by having the main drive shaft parallel the upper rod and lower rocking 'rod since a comparatively straight connection is provided between the crank on themain drive shaft and the bell crank connection to the upper rod, and a similar comparatively straight main connection is provided between the lower rocker rod and the main drive shaft.

The feeding mechanism I9 for moving materials through the machine and forming the main subject matter of this application and the appended claims comprises a feed rocker rod H9 and a feed lifter rod 5 mounted in suitable bearings in the lower arm I1 and trunk I3. This mechanism is best seen in Figs. 2 and 5. It comprises a feed dog 99 secured to a feed dog carrier II 9 as by screws H1, and this carrier in turn is connected to an arm I I9 adjustably clamped to the rock shaft II9 by a split clamp construction II9 through a spring I29 under screws I2! and at its other end has a connection through a flat spring- I22 and coil spring I29 to an arm I29 having a yoke connection I29 to the feed lift The feed dog 99 passes through suitable apertures I29 in the throat plate 99 in the usual manher and is given a four-motion movement through timed rocking of th feed rock rod H9 and feed lift rod I19. Any table feed dog, depending upon material and stitch requirements, may be secured to the carrier as by the screws I I1. Co-

operating with the feed dog 99 is a presser foot I21 carried by the presser bar 9 I, which is tubular and operates in the bushing'99in the head 99 in the well known manner. 1

A connection I28, see Figs. 1, 3, 4, 5, includ-' ing an arm I20 connected by a yoke I30 between the feed lift rod H5 and a ball andsocket connection 19 to the lower end of the crank arm 68 is provided to rock the feed lift rod.. Thus,

each time the crank D is given one complete turn grip the materials between it and the presser foot.I21. I

Operation and adjustment of the feed rocker rod II4 which controls the extent of feed, is

accomplished in an advantageous manner with a novel adjusting mechanism I32 provided by the present invention. This mechanism is best illustrated in Figs. 6 through 9 and comprises an arm I33 'securedto the trunk end of the operating rod H4 and having a link 85 connection through pivot studs and I34 to the crank arm 89 with a ball and socket connection I4 to the crank E of the main drive shaft 84. s

As may best be seen in Fig. 8, the crank arm 69 is moved pivotally about a bearing block I35 having a pivot pinconnection I38 with a sliding finger I31 so that as the top end of the crank arm 88 is driven by the crank 84 in a direction to the left of the vertical centerline of the drive shaft, the upper end of the crank arm is moved to the left above the pivot pin I38 and the lower end thereof moves to the right of the centerline and simultaneously pulls the link and arm I33 to the right as viewed therein in order to move the rocker rod H4 in a clockwise direction, and viceversa when'th'e main drive shaft 64 moves the top end of the crank arm to the right of the vertical centerline.

The bearing or pivot block I35 is movable vertically in a channel I38, formed by a notch I38,

and plate I40, the latter being held in place by suitable bolts HI, and is moved vertically in the channel by the sliding finger I3'I into any desired station. A sleeve I43, secured in lugs I44 and I45 integral with the side wall' 24 .of the trunk I3, is provided with a hollow chamber I46 to accommodate a feed or adjusting screw I" supported in bearing sleeves I43 and I 43 at the.

lower end with a special bearing sleeve I50 located in an upper lug I5I with a set screw I52. A pair of thrust collars I53, secured to the adjusting screw I41 with set screws I54 at opposite endsof the upper bearing I50 permits rotation locate andsupport a short key.

I3'I as by pins 153 and adapted to mesh with the adjusting'screw vI4-1-in order to move the finger and pivot block I35 downwardly when ro-v tated in one direction and to move these parts upwardly whenrotated in the other direction. When the screw and feed nut are'adjusted to purpose. Near theQJoWBr end of the amazes I locate and support the block in the upper position in the chamber I38, the lower end .of the crank arm 89 is given 'a considerable oscillating movement, thereby imparting a large extent of rocking movement to the associated rocker rod 4 and considerable feeding movement to the feed dog 63 to form few stitches, for example 8 or 10 stitches per inch. However, when the parts are adjusted so that the block is in the lowered position relative to the chamber, the lower .end of the crank arm is given the relatively smaller oscillating movement so that a proportionally smaller rocking movement is given to the rocker rod and the associated feed dog to form many stitches, e. g. 18 or 20 stitches per inch.

A novel gauge I80 is provided to clearly indicate the extent of feed and ghe exact number of stitches per inch formed by the various adjustment s. This gauge comprises a pointer IGI in the form of an L shaped strip attached to the feed nut I58 portion of the sliding finger I 31 by a screw I82 with a pointer I83 thereof adjacenta transparent plate I84 as best seen in Figs. 6

- and 9, in the front wall 2I of the trunk I3. When and a positive indication is given tothe operator and supervisor relative to the setting of the stitch for various types of work.

The finger I3I of the gauge I60 provided by the present invention may be passed outwardly of the frame I2 through any suitable slot and aligned exteriorly with the graduations on the plate I84. However, the illustrated embodiment {is much more advantageousbecause, through the transparent plate and associated arrangement of parts, it is possible to retain the advantage of a fully enclosed oil chamber- I3 (a line I68 in the transparent plate also indicates oil level) and because it has the advantage of preventing the finger I8I and pointer I83 from catching the work, the operator, or his clothes. Also, the pointer I 8| may be made in various shapes, for example, in the form of a novel or round ring to encircle gradnations, if preferred; the sharp straight line form now shown being merely illus- -trative of the present preferred form.

. The fully enclosed oil chamber I3 with oil level indicating glass, and the other lubricating mechanism disclosed in the present drawings are more completely disclosed in our copending application Serial No. 155,372, filed November 30, 1934.

Thus, the present invention provides a smooth, eflicient, and adjustable feeding mechanism for imparting a four motion movement to the feed dog. Further, this is preferably accomplished from a main drive shaft located midway in the trunk and, parallel'with main operating rods, as

illustrated and described herein, but it should be but to facilitate changing from wide to narrow feed dogs, and vice versa, is made separable as shown. w

Other modifications may be I made within the scope or the present invention and portions, of the improvements may be used without others.

Having thus explained the nature of' this invention and described a way of constructing and using the same; although without attempting to set forth all of the forms in which it may he made, or all of themodes of its use, we claim:

with said main drive shaft for actuating and for varying the extent of feeding movement of the feed dog; and a pointer carried by said means within said trunk, aligned with and movable past the graduations on the transparent plate for indicating the extent of feed.

2. In a sewing machine the combination of a frame; an oil chamber, in said frame; a transparent plate with graduations, carried by said oil chamber, and through which the oil may be viewed and the level thereof checked; a main drive shaft; a feed dog; means associated with said main drive shaft for actuating, and for varying the extent of, feeding movement of the feed dog; and a pointer within said oil chamber associated with said means and movable thereby past graduations on the transparent plate for indicating the extent of feed.

. 3. In a sewing machine the combination of a frame; a' transparent plate with graduation;

carried by said frame; a feed dog; a main drive shaft; means associated with said main drive shaft for actuating and for varying the extent of feeding movement of the feed dog; and a pointer carried by said means within said frame, aligned with and movable, past graduations on the transparent plate for indicating the extent of feed.

4. In a sewing machine the combination of a frame; a trunk in said frame; a lower arm; an

upper arm; a needle operating mechanism in the upper arm; a looper; looper operating rods in the lower arm; means for operating the looper; a main drive shaft located in the trunk substantially centrally between the upper and lower arms; a feed dog; a feed rock rod; a feed lift rod, said feed dog and feed rods being located and supported in the lower arm, and separated from the looper operating rods; a crank arm associated with said main drive shaft and said needle operating mechanism; and means including a pair of crank arms associated with said centrally located drive shaft adapted to operate the feed dog through the feed lift and rock rods coordinately with the needle operating mechanism.

arm and coordinately mechanism.

-6. In a sewing machine the combination of a frame; a trunk in said frame; a lower arm; an

5. In a sewing machine the combination of aframe; a trunk in said frame; a'lower arm; an upper arm; a needle operating mechanism in the upper arm; a main drive shaft located in the trunk substantially centrally between the upper and lower arms; a feed dog adapted to move work transversely across the,lower arm; a feed lift rod; a feed rock'rod, said feed rock and feed lift rod being located and supported in the lower arm; a crankarm associated with said main drive shaft and said needle operating mechanism; and adjustable meansincluding a pair of crank arms adapted to operate the feed dog through the feed lift and rock rods, transversely of the lower. with the needle operating upper arm; a needle operating'mechanism in the upper arm; a main drive shaft located in the trunk substantially centrally between the upper and lower arms; a feed dog adapted to feed work transversely of the lower arm; a feed lift rod; a feed rock rod, said feed dog and the feed rock and feed lift rods being located and supported in the lower arm; a crank arm associated with said main drive shaft and said needle operating mechanism; adjustable means including a pair of crank arms adapted to operate the feed dog through the feed lift and rock rods, transversely of the lower arm and coordinately with the needle operating mechanism; and a gauge associated with thelast named means giving a visual indication of the extent of feeding. 1

"I. In-a' sewing mechanism the combination of a work support;-a main drive shaft; a crank on said main drive shaft; a feed dog; a feed dog carrier beneath the work support; means for lifting the feed dog; a feed rocker rod associated with the feed dog carrier; an arm on said rocker rod; a crank arm having a direct connection with said crank on said main drive shaft; -a pivot for said crank arm intermediate its length; and a link directly connected to said crank arm at a point spaced longitudinally of the latter from said pivot, connecting said crank arm to said arm on the rocker rod for imparting feeding movement to the associated fee'd dog carrier coordinately with the lifting movement thereof.

8. In a sewing mechanism the combination of a worksupport; a main drive shaft; a crank on aid main drive shaft; a feed dog; a feed dog carrier beneath the work support; means actuated by said main drive shaft for lifting the feed dog; a feed rocker rod associated with the feed dog carrier; an arm on said rocker rod; a crank arm having a direct connection to the crank of said main drive shaft; a pivot for said crank arm intermediate its length; a link connecting said crank arm to said arm on the rocker rod for imparting feeding movement to the associated feed dog carrier coordinately with the lifting movement thereof; and an adjustable support for said pivot adapted to vary the extent of movement of the end of the crank arm while the main drive shaft end does not vary, thereby changing the extent of associated rocker rod and feed dog carrier movement and extent of feeding movement.

9. In a sewing machine the combination of a frame; a main drive shaft in the frame; a feed dog; a feed dog carrier; means actuated by the main drive'shaft for lifting the feed dog; a feed rocker rod associated with the feed dog carrier; an arm on said rocker rod; a crank arm on said main drive shaft, having a channel; a link connecting said crank arm to said arm on the rocker rod; a pivot for said crank arm; and adjustable means adapted to move said pivot in the channel of the crank arm to vary the extent of movement to the end of the crank arm and necting said crank arm to said arm on the rocker rod; a pivot for said crank arm; adjustable means adapted to move said pivot in the channel of the crank arm to vary the extent of movement to the end of the crank arm and through the link ment.

11. In a sewing machine the combination of a frame; a main drive shaft in the frame; a-feed dog; a feed dog carrier; means actuated by the main drive shaft for lifting the feed dog; a feed rocker rod associated with the feed dog carrier; an arm on said rocker rod; a crank arm on said main drive shaft, having a channel; a link connecting said crank arm to said arm on the rocker rod; a pivot for said crank arm; adjustable means adapted to move said pivot in thechannel of the crank arm to vary the extent of movement to the end of the crank arm and through the link vary the extent of feeding movement to the feed dog; a transparent plate with graduations; and a pointer carried by said means behind said plate and cooperating with the graduations on the transparent plate to indicate the extent of feed.

12. In a sewing machine the combination of a frame; a main drive shaft in the frame; a feed dog; a feed dog carrier; means actuated by the main drive shaft for lifting the feed dog; a feed rocker rod associated with the feed dog carrier;

an arm on said rocker rod; a crank arm on'said main drive shaft, having a channel; a link connecting said crank arm to aigl arm on the rocker rod; a pivot for said crank arm; adjustable means adapted to movesaid pivot in the channel of the crank arn to'vary the extent of movement to the end of the crank arm and through the link vary the extent of feeding movement to the feed dog;

a plate with graduations; and a pointer carried to said arm on the rocker rod; a pivot for said crank arm; a slide for said pivot; and a screw, supported for rotation and against longitudinal mgvement in said frame, and cooperating with said slide to vary the location of the pivot and to thereby vary the extent of feeding movement to the feed dog,

14. In a sewing machine the combination of a frame; a feed dog; a main drive shaft; means associated with the drive shaft for operating said feed dog; adjusting mechanism in said means for controlling the extent of feeding travel of said feed dog; a screw in said adjusting mechanism, supported for rotation and against vertical movement in said frame; and an adjusting key located and supported for rotation and against axial movement by said screw and frame.

15. In a sewingmachine the combination of a frame; a trunk in said frame; a transparent plate, carried by said, trunk; a feed dog; a main drive shaft; means associated with said main drive shaft for actuating and varying the extent of feeding movement of the feed dog; and relatively movable means associated with said transparent plate and the first named means for indicating the extent of feed.

16. In a sewing machine the combination of a frame; an oil chamber in said frame; a main drive shaft; a feed dog; means associated with said main drive shaft for actuating, and varying the extent of, feeding movement of the feed dog; atransparent plate enclosing said means, and through which the oil in the chamber may be viewed and the oil level checked; and relatively movable means associated with said transparent plate and the ,flrst named means for indicating the extent of feed.

17. In a sewing machine the combination of a frame; a transparent plate caried by said frame;

of the feed dog; and a member movable by said means, enclosed by and viewable through the transparent plate, for indicating the extent of feeding movement.

19. In a sewing machine the combination of a frame; an oil chamber in said frame; a transparent plate carried by said oil chamber; graduations on said plate to indicate extents of feed; a line on said transparent plate for indicating the oil level; a main drive shaft; a feed dog; means associated with said main drive shaft for actuating, and for varying the extent of, feed ing movement of the feed dog; and a pointer within said oil chamber associated with said means and movablethereby past "the graduations on the transparent plate for indicating the extent of feed.

20. In a sewing machine the combination, of a frame having a socket; a transparent plate with graduations, carried by said frame; a feed dog; a main drive shaft; means associated with said main drive shaft for actuating and for varying the extent of feeding movement of the feed dog, substantially enclosed and made inaccessible by said frame; a pointer carried by said means within said frame, aligned with and movable past graduations on the transparent plate for indicating the extent of feed; and a key adapted to be passed into the socket in said frame for association with, and to adjust, said means.

21. In a sewing machine the combination of a frame; a transparent plate carried by said frame; a feed dog; a main drive shaft; means associted with the main drive shaft for actuating and for varying the extent of feeding movement of the feed dog, substantially enclosed and made inaccessible by said frame; a; member movable by arms; a feed dog; a feed rock rod; a. feed lift rod, said feed dog and feed rods being located and supported in the lower arm, and separated from the looper operating rods; a crank arm associated with said main drive shaft and said needle operating mechanism; means including a pair of crank arms associated with said centrally V 9,145,828 located drive shaft adapted to operate the feed dog through the feed lift and rock rods coordinately with the needle operating mechanism; and a movable member associated with said means for indicating the extent of feeding movement.

23. In a sewing machine the combination of a frame; atrunk in said frame; a lower arm; an upper arm; aneedle operating mechanism in the pp r arm; a main drive shaft located in the trunk substantially centrally between the upper and lower arms; a feed dog adapted to move work transversely across the lower arm; a feed lift rod; a feed rock rod; said feed rock rod and feed lift rod being located and supported in the lower arm; a crank arm associated with said main drive shaft and said needle operating mechanism; adjustable means including a pair of crank arms adapted to operate the feed dog through the feed lift and rock rods, transversely of the lower arm and coordinately with the needle operating mechanism; and a movable member associated with said means for indicating the extent of feeding movement.

24. In a sewing machine the combination of a frame; a feed dog; means of lifting the feed dog; a feed rocker rod associated. with the feed dog; an arm on the feed rocker rod; a main drive shaft in said frame; a crank arm on said drive'shaft;

a link connecting said crank arm to said arm on the rocker rod; a pivot for said crank arm; a slide for said pivot; a screw, supported for rotation and against longitudinal movement in said frame, and cooperating with said slide to vary the location of the pivot and to thereby vary the extent of feeding movement to the feed dog; a transparent plate with graduations in said frame; and a pointer associated with said slide and graduations, to indicate the extent of feeding movement.

25. In a sewing machine the combination of a frame; a feed dog; means of lifting the feed dog; a feed rocker rod associated with the feed dog; an arm on the feed rocker rod; a main drive shaft in said frame; a crank arm on said drive shaft; a link connecting said crank arm to said arm on the rocker rod; a pivot for said crank arm; a slide for said pivot; a screw, supported for rotation and against longitudinal movement in said frame, and co-operating with said slide to vary the location of the pivot and to thereby vary the extent of feed- .ing movement to the feed dog; and a pair of relatively movable members associated with said slide, to indicate the extent of feeding movement.

26. In a sewing machine the combinationof a frame; an oil retaining chamber in said frame; a main drive shaft; a feed dog; means with the drive shaft for actuating the feed dog; adjusting mechanism within the chamber for varying the extent of feeding movement; and relatively movable means associated with said oil retaining chamber and the adjusting mechanism within the chamber for indicating the extent of feed.

27. In a sewing mechanism the combination of a work support; a main drive shaft; a feed dog; a feed dog carrier beneath the work support; means actuated by said main drive shaft for lifting the feed dog; a feed rocker rod associated with the feed dog carrier; an arm on said rocker rod; a crank arm having an upper end on said main drive shaft; a pivot for said crank arm intermediate its length; a link connecting the lower end of said crank arm to said arm on the rocker rod for imparting feeding movement to the associated feed dog carrier coordinately with the lifting movement thereof; an adjustable support for said pivot adapted to .vary the extent of movement of the lower end of the crank arm while extent of movement of the upper and main drive shaft and thereof does not vary, thereby changing the extent of associated rocker rod and feed dog carrler movement and extent of feeding movement;

a transparent plate with graduations; and av pointer associated with said adjustable pport and movable thereby past the graduations on the plate, for indicating the extent of feed.

' 28. In a sewing machine the combination of a frame; graduations on said frame; a feeding mechanism; only one means including a screw for setting the feeding mechanism and for controlling the extent of feed; only one manually oper-' able member in said last named means for operating it and the screw therein; and a pointer associated with said graduations and located remotely from said manually operable member for automatically indicating the setting effected by the first named means.

29. In a sewing machine the combination of a frame; graduations on said frame; a drive shaft;

a feeding mechanism including a slidable pivot;

only one means including a screw for sliding the pivot relative to the drive shaft, for setting the feeding mechanism and for controlling the extent of feed; only one manually operablemember for operating the last named means and the screw therein; and a pointer located remotely from said manually operable member, associated with the graduations, and relative movement between said pointer and graduations being effected by said screw. I

JOHN P. WEIS.

FREDERICK F. ZEIER.

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