US2363774A - Sewing machine - Google Patents

Description

Nov., 28, i944. N. v. cHRlsTr-:Nsx-:N ET AL. 2,353,774

SEWING MACHINE Filed March ll, v1941 7 Sheets-Sheet l w1 TNESSES; L X W L INVENTORS: Aff/maiz l'lzrims'ezz, 'or Sauer @MMM BY 4 ed hzmbezy,

Nov. 28, 1944. N. v. cHRlsrENsEN ET AL 2,353,774

SEWING MACHINE Filed March 11 1941 '7 Sheets'PSheet 2 IIHII Nov. 28, 1944- N. v. cHRlsTENsEN ET Al. 2,353,774

SEWING MACHINE Nov. 28, 1944- N. v. cHRlsTENsEN ET AL SEWING MACHINE Filed March ll, 1941 7 Sheets-Sheet 4 INVENTORSI Sauer @www ATTORNEYS.

Nov. 28, 1944. N. v. cHRlsTx-:NSEN ET Al. 2,363,774

SEWING MACHINE m n i 1.11:

v War/nmz Rume/1.5m, eor Sauer M MM BY cf. Wed Waglweiy,

Nov. 28, 1944. N. v. cHRlsTENsEN ET AL 2,363,774

SEWING MACHINE Filed March 1l, 1941 '7 Sheets-Sheet 6 ATTORNEYS.

'i l Nov. 28, 1944. N. v. CHRISTENSEN ET AL 2,353,774

SEWING MACHINE Filed March 1l, -1941 7 Sheets-Sheet 7 V) 3l yl 32 BY fp /Vmi man@ f @www Patenten INOV- 1544 UNITED STATES PATENT OFFICE SEWING MACHINE Norman V. Christensen, Chicago, George Sauer,

Berwyn, and Ned Wallenberg, Chicago, Ill., assignors to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application March 11, 1941, Serial No. 382,692

25 Claims.

of the parts required in the drive or actuating in Figs. 2, 8 and 9. mechanism relied upon for impartation of the Figs. 11-16 are detail views showing successive necessary movements to the stitch-forming and positions of the needle and the loopers of the feeding instrumentalities of the machine (as well machine in the performance of a stitch forming as to trimming devices if present) to eliminate cycle. as far as possible the need for reciprocating parts l0 As herein illustrated our improved sewing maparticularly in the drive or actuating mechanism; chine has a box-like base I of generally rectanguand to enable, for the purpose of self-lubrication, lar configuration with integral front, rear and enclosing of the drive or actuating mechanism in side walls 2, 3, 4 and 5` and bottom 6, in which a housing of relatively small dimensions, with base a supply of lubricating oil is normally mainallocation however of the stitch-forming and tained at the level L. Bridging the front and rear feeding instrumentalites (and trimming instru- Walls 2 and 3 of the base I intermediate the mentalities) externally of such housing, and with side walls 4 and 5, is a relatively narrow horiprovision for the transmission of motion to said zontal longitudinally-disposed plate-like web 1, instrumentalities from the actuating mechanism see Figs. 1, 2 and 8, which partly closes the base to the exclusion of oil leakage from the housing. at the top and which constitutes the mid-section In connection with a sewing machine having of the work support of the machine. As shown in the above attributes, it is a further aim of our Figs. 6 and 8, the web 'I is extended as at 1a. invention to secure the desirable advantages inbeyond the front wall 2 of the base I, and has herent to the use of a straight needle bar which downwardly-recessed margins 8 along its parallel is confined solely to endwise reciprocation. longitudinal side edges. The base I is otherwise Other objects and attendant advantages will closed by horizontal plates 9 and Ill, which are appear from the following detailed description of DOSitiOned 170 ODDOSte Sides 0f the Web 7 and the attached drawings, wherein complete the work support. As shown in Figs. Fig. 1 shows our improved sewing machine in 1 and 2, the plates 9 and I0 are iiush with the plan with its top cover removed. 30 top of the web 'I, and are upwardly recessed mar- Fig. 2 shows the front elevation of the maginally along their inner edges as at II to overchine with its top cover removed. lap the downwardly-recessed margins 8 of said Fig. 3 is a fragmentary view of the machine web. Screws I2 and I3 respectively engaging in front elevation with the top cover in place, downwardll7 IIGO Web 'I and the Walls 0f the base Fig. 4 shows the machine in front elevation 35 I serve to removabliT Seeure the plates 9 and I0 with a broken out portion in section taken as ih place With hteI'pOS'I/OH 0f Sealing gaskets at approximately indicated by the angled arrows I4 and |5- FIOIh Fig. 1 it iS 'G0 he noted that the IV-IV in Figs. 6 and 1U. plate 9 at its front end, extends somewhat be- Fig. 5 is a fragmentary view showing the leftyond the web 'I while the plate I0 is coextensive hand side elevation of the machine with the top in length With Sad Web Sei? iIltO a Cut-01113 in cover in place. the inner edge of the plate 9 is a throat plate I6 i Fig. 6 shows the left-hand side elevation of of semi-Circular configuration which will be the machine with a broken out part in section again Iefelled t0 latertaken as indicated by the angled arrows VI-VI The stitch forming mechanism of the machine in Figs. 2 and 4, and with the top cover omitted. 45 includes a needle bar I8 which is inclined some- Fig. '7 shows the right-hand side elevation of what to the vertical forwardly in the direction of the machine with portions broken out and with feeding which is indicated by the arrows in Figs. portions in section to better illustrate important 1 and 6. As shown in Figs. 1 and 4, the needle structural details and to expose certain parts at bar I8 is disposed in a vertical plane well to the the interior. right of the line A--A of feeding (Fig. 1), and Fig. 8 is a view in plan section taken as indipasses downward through the mid-section l of cated by the angled arrows VIII-VIII in Fig. 2, the work support into a hollow offset or comand with portions broken away to expose underpartment I9 at the front of the base I, said comlying parts. partment being set apart from the main compart- Fig. 9 is a transverse section of the machine 55 ment or hollow 20 of the base by the front wall taken as approximately indicated by the angled arrows IX-IX in Figs. 1 and 8.

Fig. 10 is a longitudinal section taken as approximately indicated by the angled arrows X-X 2 of the latter (Fig. 6) and by a partition 2| (Figs. 4 and 6). From Fig. 6 it will be further observed that the needle bar I8 is confined to endwise reciprocation in oil- tight bushings 22, 23,

respectively, set into aligned bores in the web 1 and in the bottom 6 of the base, the lower bushing being secured against displacement by a set screw 25 and closed at its lower end by a screw plug 26. Rotation of the needle bar I8 is prevented through engagement of the lateral projection 21 on a collar 28 secured to said bar, in a vertical slot between two guide plates 2 9 aflixed to the wall 2 within the hollow of the offset I9 of the base I, see Figs. 4 and 6. Adjustably secured to the top end of the needle bar I8 by a pair of set screws 30, is a laterally-extending arm 3|, which, in its end supports, with capacity for endwise and rotative adjustment in the plane A-A (Fig. 1) of stitching and feeding and in parallel relation to said bar, a sewing needle 32.

The stitch-forming mechanism of the illustrated machine further includes a primary or under looper 35 which is external to the base I and which cooperates with the needle 32 beneath the throat plate I6; and a secondary or overedge looper 36 which is also external to the base I, see Figs. 2, 4, '1 and 10. As shown, the loopers 35 and 36 are arranged to operate crosswise of the direction of feeding. The under looper 35, see Figs. 4 and 10, is affixed to the outer end of a short horizontal oscillated shaft 31 which extends, with an oil-tight fit, into the interior nf the base I, through a bearing boss 38 (Fig. 10) on the front wall 2 of said base. At an intermediate point, the overedge looper 36 has a. pivotal connection 39 (Fig. 4) with a lazy bar or arm 4f! secured to the outer end of a horizontal pin 4I which is journalled for free oscillation in another oil-tight bearing boss 42 (Fig. 10) on the front wall 2 of the base I, axial movement of said pin being prevented by a thrust collar 43 at the inner end thereof. At its lower end, the overedge looper 36 (Fig. 4) has a pivotal connection 44 with an arm 45 at the outer end of a short horizontal oscillated shaft 46 which extends into the interior of the base I through another oil-tight bearing boss 41 on the front wall 2. As shown in Figs. l and 4, the opposing side edges of the web 1 and the throat plate I6 are complementarily notched to provide a clearance opening 48 in the extended free or over-hanging portion of the work support through which opening the swinging outer end of the overedge looper 36 passes from beneath to a point above the work support around the edge E of fabric F (Fig. 1) operated upon in the machine.

For the purpose of intermittently progressing the fabric F on the work support relative to the needle 32, we utilize in the present instance a main feeding element in the form of a four motion feed dog 50 and an auxiliary four-motion differential feed dog I. The toothed portions of the feed dogs 50 and 5I operate upwardly through slots 52, in the throat plate I6, see Fig. 10, the differential dog operating in advance of the main dog to gather in the fabric to a predetermined extent (as desirable when knitted goods are worked in the machine to compensate for stretch) before it is presented to the needle 32. As shown in Figs. 8 and 10, the shanks of the feed dogs 50 and 5I extend horizontally inward into the base through a shallow opening jointly formed by a` notch 53 in the top edge of the front wall 2, and the overlying plate section 9. Opposing the feed dogs 50 and 5I from above is a presser foot 55 which is pivotally connected intermediate its ends at 56 to a supporting shank member 51. As shown in Fig. 10, the shank member 51 is clamped at its upper end to the pendant portion of a stud 58 at the front end of a horizontal presser arm 59. At its rear end, the presser arm 59 is secured by a set screw 88 (Fig. 1) to one end of a transverse rock shaft 6I which is journalled in laterally-spaced bearing lugs 62 and 63 upstanding from the web 1. The presser foot 55 is yieldingly urged downwardly by a leaf spring 65 whereof one end is pierced to engage a vertical anchorage stud 66 in an upright boss 61 on the top of the web 1, and whereof the other end is bifurcated to similarly engage the upwardlyextending end of the stud 58 at the outer end of the presser arm 59. Regulation of the spring 65 is effected through a hook block 68 which embraces it at the center and which is adjustable up or down by means of thumb screw 69 whereof the shank threadedly engages downwardly into a boss on the top of the web 1. When desired or required to facilitate introduction or withdrawal of the work beneath or from beneath the presser foot, the latter may be lifted through the medium of a control lever 10 (Figs. 1, 1 and 10) whereof the outer end is intended to be connected by a drop link with a knee press or foot treadle, these latter elements having been omitted from the drawings since they may be of any well known or approved construction.` The lever 1U is freely fulcrumed on the end of the rock shaft 6I opposite that occupied by the presser arm 59, and is subject to a torsion spring 12 which tends to move it anti-clockwise in Fig. 1 so that it is normally maintained in engagement with an overhanging stop pin 13 in a post 14 rising from the web 1 As shown in Fig. l, the spring 12 is coiled about the fulcrum boss on the lever 10, one of its ends being secured to an anchorage screw 15 on the bearing lug 63 and its other end being hooked under said lever as at 18. Extending laterally from the fulcrurn boss of the lever 18 is a lug 11 (Fig. '1), which, when said lever is depressed, engages a downward projection 18 o-n a collar 19 xedly clamped to the end of the rock shaft 6I to turn the latter clockwise and thereby cause the presser arm 59 to be lifted for the purpose previously mentioned. As shown in Fig. '7, a clearance ordinarily exists between the lug 11 and the projection 18 so that the presser foot 55 may rise and fall normally as required without interference by the control lever 10.

In certain instances of practice, it is desirable to trim the edge of the fabric before such edge is stitched. We have accordingly provided our improved sewing machine with a trimming means for the explanation of which reference will be had now more especially to Figs. 1, 4. '1, and 10. As shown, this trimming means comprises a stationary ledger blade which lies in a plane slightly to the right of the line of stitching A-A (Fig. 1), and which is pitched forwardly at an Y acute angle to the vertical in the direction of feeding. The ledger blade 80 is secured, with provision for endwise adjustment, in a suitable nolder block 8| by a bolt 82, said holder block being shiftable transversely of a pendant lug 83 on the cover plate 9 for adjustment of the blade laterally of the stitching line A-A, and being fixable in shifted positions by a screw 84. The upper end of the ledger blade 80 extends into the clearance opening 48 in the work support of the machine and terminates in a horizontal cutting edge 85, as best shown in Fig. 10. Cooperative with the ledger blade 80 is a vertically-supported moving trimming blade 86 having a horizontal cutting edge 81 at its bottom end to shear against the cutting edge 85 of said ledger blade, and also a pendant tongue extension 88 by which the two blades are maintained in cutting alignment when in open position. At its upper end, the blade 81 is secured in a head 89 at one end of a horizontal rod 90 which is non-rotatable but axially slidable in laterally-spaced bearing bosses 9| and 92 at the front end of a horizontal supporting arm 93, see Fig. 1. As shown the arm 93 parallels the presser arm 59 and is freely fulcrumed on the rock shaft 6I in the interval between the bearing lugs 62 and 63. A coiled spring 95 in compression between the boss 92 and a collar 96 on the rod 90 yieldingly urges the latter leftward in Figs. 4 and 9 to maintain the moving blade 86 in shearing engagement with the ledger blade 80.

Suitable spring disk tensions 91, 98 and 99 (Fig. 1) are provided on the cover plate I0, respectively, for the needle and looper threads (not illustrated). En route from the tension 91 to the needle 32, the needle thread is passed through apertured pairs of opposing control fingers and |0|, respectively, mounted on the top of the web 1 and to the rear of the needle supporting arm.

The base I is utilized as a housing for actuating mechanism from which the various aforedescribed externally-located moving parts of the machine derive their movements, said mechanism including a pair of transversely-extending parallel shafts |02 and |03 in the lower part of the base I. 5

As seen in Figs. 4 and 8, the shaft I 02 extends outward through a bushed oil-tight bearing boss |05 on the right-hand side wall 5 of the base I, and on its protruding end carries a combined hand and belt wheel |06 by which the machine may be driven either manually or under power. The other or left-hand end of the shaft |02 extends through a bushed bearing |01 on the partition 2| into the compartment or hollow of the offset I9 at the front of the base I. Secured to the shaft |02 within the oiset I9 is a balanced crank member |08 with a crank pin |09 to which is connected the lower end of a pitman I I 0 whereof the upper end is connected to a lateral stud I I on the collar 28 previously referred to. By the means just described, the rotary motion of the shaft |02 is converted into endwise reciprocating movements of the bar I8 and the supporting needle 32. As shown in Fig. 4, oil is permitted to flow from the compartment into the compartment I9 by way of a connecting duct II2 at the bottom of the partition 2 I The moving parts within the compartment I9 are automatically lubricated by oil splash induced by intermittent dipping of a spoon ||3 at the bottom end of the pitman into the oil supply. The companion shaft |03 is journalled adjacent its right-hand end in a bearing boss |I4 upstanding from the bottom 6 of the base I, while its left-hand end is rotatively supported in a bushed oil-tight bearing I|5 on the left side wall 4 of said base. The shaft |03 is driven in unison with the shaft |02 but in the opposite direction through a pair of similar connecting intermeshing spur pinions IIE and IIT. Mounted on the shaft I 03 about midway between the gear ||1 and the bearing ||5 (Figs. 8 and 9) is a rotary eccentric actuator I IB, which, through a vertical pitman ||9 is coupled with a ball arm |20 on the inner end of the oscillating shaft 31 of `the primary or under looper 35. Immediately `to the left of the rotary eccentric actuator II8 is another rotary actuator I2| which is in turn connected to a ball arm |22 at the inner end of the oscillating shaft 46 for the secondary or overedge looper 36 through a vertical pitman |23. Lift movements are induced in the feed dogs 50 and 5| through a vertical pitman |26, from a third rotary eccentric actuator |25 mounted on the shaft |03 immediately to the right of the bearing boss I I5. At its upper end, the pitman |26 is connected to a headed screw stud |21 (Figs. 8 and 10) at the front end of the horizontal carrier bar |28 on which the main feed dog 50 is mounted, the rear end of said bar being pivotally connected at |29 to the upper end of a bifurcated upright rocker |30 on a horizontal rock shaft |3| within the base at the rear and about midway of the height of the latter. The feed rock shaft I3| is journalled in three spaced bushed bearings I32, |33 and |34 (Fig. 8), the rst of these being on the left-hand end wall 4 of the base and the 4other two projecting forwardly from the rear wall 3. Horizontal to and fro or feed movements are imparted to the main feed dog from a rotary actuator |35 on the right-hand end of the shaft |03 adjacent the bearing II4, see Figs. 7, 8 and 9. As shown, the rotary actuator |35 has a crank pin |36 which is adjustable by means of a screw |31 for the purpose of varying the feed stroke of the feed dogs 50, 5|, the movements of said rotary actuator being converted into oscillatory movements of the feed rock shaft |3| as a consequence of the connection of the crank pin with a forwardly-extending arm |38 at the right-hand end of said shaft. The shank of the differential feed dog 5| (Fig. 10) is secured by a clamp screw |39 to one end of a horizontal rod |40 which is slidable endwise in spaced guide lugs I4I on the main feed bar |28. A collar |42 fast on the rod |40 in the interval between the guide lugs |4| has a lateral pivot stud |43 for connection of the forward end of a link |45. The other end of the link is pivotally connected to a block |46 which is adjustable along an arcuate slot |41 in a lever plate |48 secured to one of the side arms of the feed rocker |30. Through this means, differential horizontal to and fro or feed movements are imparted to the differential feed dog 5 I. The coupling or coordination of the main and diiferential feed dogs in the manner just explained is well known and therefore, per se, forms no part of our invention.

The supporting arm 93 of the moving trimming blade 81 is vibrated up and down by a fth rotary eccentric actuator |50 (Fig. 9) on the shaft |03 in the interval between the gear pinion ||1 and the rotary actuator ||8. Extending up from the rotary actuator |50 is a vertical pitman |5| which passes through an opening |52 in the web 1 and at its upper end is connected to a stud |53 projecting laterally from the cutter arm 93 at a point intermediate the ends of the latter. An oil seal is maintained at the orifice |52 by a group of washers |55 (Figs. 4 and 7) the uppermost one of which is caused to bear against a considerable margin around the orifice at the under side of the web under the influence of an upwardlypressing nger spring |56, said washers having a snug sliding fit with the intermediate cylindric rod portion of the pitman I5I.

For the most part, the moving elements withinthe chamber or hollow 20 of the base I are lubricated by splash oil dispersed by the gear pinions IIB, I1 and by spoon projections |51, |58, |59 and |60 at the lower ends of the pitmans IIS,

|23, 26 and 5|, which pinions and projections dip into the oil supply as clearly shown in Fig. 9. That portion of the oil thrown up by the gear pinions ||6, ||1 and impinging upon the under side of the cover plate I is directed by crossed ns |6| on said cover into an underlying reservoir |62 secured to the side wall 5 of the base by a screw |63. The oil collected in the reservoir |62 is conducted by means of tubes |65, |66 and |61, respectively, to the ball arms |20, |22 on the looper shafts 31, 46 and to the rotary actuator |35. A cylindrical block |68 of transparent material with a Abeveled bottom end face |69 extends down through an opening in the cover plate I0 to the bottom of the base I and serves as a directreading sight gauge by which the oil supply level may be checked from time to time. This oil gauge forms the subject of a co-pending application Serial No. 377,499 led on May 2'1, 1940, by George Sauer.

The parts within the base I are accessible from above upon removal of the plates 9 and I0. An additional removable closure plate |10 over an opening in the side wall 5, (Figs. 8 and 9) makes possible access to the rotary actuator |35 for the purposes o-f ready inspection or adjustment. The parts within the offset I9 are in turn accessible by way of front and side openings covered by removable closure plates I1| and |12, see Figs. 2, 4, 6 and 10.

For the protection ofthe parts above the work support and to safeguard the operator from possible injury by contact with them, we have provided the machine with a comparatively shallow cover |15, see Figs. l, 3, 5, and 10, which, at the center of its rear edge, is connected to the web 1 by a hinge |16 so that it may be swung upward and rearward when access to said parts is desired or required. At the center of its front edge, the cover is fitted with a grasp knob |11, and also with a spring keeper |18 which is normally in yielding restraining engagement with a spring hold down catch |19. As shown in Figs. 3 and 5, ample clearance |80 is allowed beneath the left-hand side wall and beneath contiguous portions of the front and rear walls of the cover |15 to enable the operator to see the needle 32 and the presser foot 55 in guiding the right-hand edge of the fabric which is to be trimmed and over-edged, and to enable passage of the fabric rearward over the work supporting plate 9.

The operative cycle of the stitch-forming elements is shown in Figs. 11-16. In Fig. 11, the needle 32 has reached its lowermost position, while the under looper is moving forward in readiness to take the needle thread loop (not shown) and the overedge looper 36 is still retreating. In Fig. 12 the under looper 35 is in the position of engaging the needle thread loop just as the needle 32 has begun to rise; while the overedge looper has reached the limit of its retractive stroke. In Fig. 13 the overedge loo-per 36 has passed beyond the path of the under looper 35 in readiness to carry its own thread loop (not shown) up and around the edge of the fabric, while the needle 32 continues in its ascent. In Fig. 14, the under looper `35 has started to retreat, the needle has reached the upper limit of its stroke, and the overedge looper 36 is moving upward and laterally into the path of the needle 32. In Fig, 15, the needle has begun its downward stroke and is in position to enter the thread loop (not shown) presented to it by the overedge looper 36. Fig. 16 shows the needle 32 continuing its downward movement and is penetrating the fabric, the overedge looper 36 retreating, and the under looper advancing toward the needle.

Having thus described our invention, we claim:

1. In a sewing machine, a hollow box-like base containing a supply of lubricating oil and closed at the top; a flat horizontal work support associated with the base; an endwise-reciprocating needle bar extending up from within the base through an oil-tight bearing in the top of the base; a needle carried by the protruding end of the bar for movement on its work-penetrating stroke down through the work support; a looper to cooperate with the needle beneath the work support; actuating mechanism within the base from which the needle bar and the looper derive their movements in properly timed relation; and means for lubricating the actuating machanism from the oil supply within the b'ase.

2. A sewing machine according to claim 1, wherein the base is subdivided into two compartments, one into which the needle bar extends, and one in which the actuating mechanism is housed; and wherein an operating connection extends through a dividing wall from the actuating mechanism in the last mentioned compartment to needle bar operating mechanism in the first mentioned compartment.

3. In a sewing machine, a hollow box-like base containing a supply of lubricating oil and closed at the top; a hat horizontal work support associated with the base; an endwise-reciprocating needle bar extending up from within the base through an oil-tight bearing in the top of the base; a needle carried by the protruding end of the bar for movement on its work penetrating stroke down through the work support; a looper exteriorly of the base to cooperate with the needle in stitch formation beneath the work support; an operating shaft for the looper extending through an oil-tight bearing into the interior of the base; actuating mechanism within the base from which the needle bar and the looper operating shaft derive their movements in properly timed relation; and means for lubricating the mechanism from the oil supply within the base.

4. A sewing machine according to claim 1, wherein the actuating mechanism includes a pair of gear-connected shafts from one of which the needle operating mechanism is actuated, and from the other of which the looper is actuated; and wherein one of the gear-connected shafts extends to the exterior through an oil-tight bearing in the base and on its protruding end carrie a drive wheel.

5. A sewing machine according t0 claim 1, wherein the base is subdivided into two compartments, one into which the needle bar extends and one in which the actuating mechanism is housed; and wherein the actuating mechanism includes a pair of horizontal gear-connected shafts from one of which the looper is actuated, and the other of which extends through a dividing partition into the first mentioned compartment; a crank on the latter shaft within said first mentioned compartment; and a pitman connecting the crank with the needle bar.

6. A sewing machine according to claim 3, wherein the actuating mechanism includes a pair of inter-geared shafts from one of which the needle bar is actuated and from the other of which the looper is actuated; and further including a second looper exteriorly of the base to cooperate with the rst looper and the needle in the formation of overedge stitching; and a separate shaft for oscillating the second looper also extending through an oil-tight bearing into the interior of the base for actuation with said first looper from the second of the two intergeared shafts.

7. A sewing machine according to claim 3, wherein a portion of the work support extends beyond the base; wherein the needle passes through the extended portion of the work support; and wherein the looper cooperates with the needle beneath said extended portion of the work support.

8. A sewing machine according to claim 3, wherein a second looper exteriorly of the base cooperates with the first looper and the needle in the formation of overedge stitching; wherein a separate shaft for oscillating the second looper also extends through an oil-tight bearing into the interior of the base for actuation from the actuating mechanism; wherein a portion of the work support extends beyond the base; wherein the rst looper coacts with the needle below the extended portion of the work support; and wherein the second looper in its movements passes through an opening in the extended portion of the work support from beneath the latter to a point above it and vice versa.

9. A sewing machine according to claim 3, wherein a portion of the work support extends beyond the base; wherein a feed element operates upwardly through an aperture in the overhanging portion of the work support; wherein operating connections for the feed element extend through a wall of the base to the interior for actuation from the actuating mechanism; and wherein a presser element cooperates with the feed element above the work support.

10. A sewing machine according to claim 3, wherein the actuating mechanism includes a pair of inter-geared horizontal shafts from one of which the needle bar is actuated, and from the other of which the looper is actuated; wherein a portion of the work support extends beyond the base; wherein a` four-motion feed dog operates through a slot in the extended portion of the work support; wherein the feed and lift movements are imparted to the feed dog through connections interiorly of the base with the second mentioned shaft of the actuating mechanism; and wherein a presser foot reacts upon the feed dog from above the work support.

11. A sewing machine accordingto claim 3, wherein a portion of the work support extends beyond the base; wherein an intermittent feeding element operates at the overhanging portion of the work support to progress the work relative to the needle; and wherein a trimming means operates to trim the work in advance of the needle, said trimming means including a ledger blade secured within an opening in the extended portion of the work support, a coacting movable blade, a horizontal arm fulcrumed for up and down movement above the work support and carrying the movable blade, and an operating rod extending down through an oilsealed opening in the base top from the arm to the interior of the base for actuation from the actuating mechanism.

12. A sewing machine according to claim 3, wherein a portion of the work support extends beyond the base; wherein an intermittent feeding element operates at the overhanging portion of the work support to progress the work relative to the needle; wherein the actuating mechanism includes a pair of inter-geared horizontal shafts from one of which the needle bar l is actuated, and from the other of which the loop.

er is actuated; and wherein a trimming means operates to trim the work in advance of the needle, said trimming means including a ledger blade secured within an opening in the extended portion of the work support, a coacting movable blade, a horizontal arm fulcrumed for up and down movement above the work support and carrying the movable blade, and an operating rod extending down through an oil-sealed openf ing in the base top from the arm to the interior of the base for actuation from the second mentioned shaft of the actuating mechanism.

13. A sewing machine according to claim 3, wherein the actuating mechanism includes a pair of inter-geared horizontal shafts whereof one extends outward through an oil-tight bearing in a wall of the base and at the exterior carries a driving wheel; and further including a second looper exteriorly of the .base to cooperate with the irst looper and the needle in the formation of overedge stitching; a separate shaft for the overedge looper also extending through an oil-tight bearing into the interior of the base; a four-motion feed element which operates from beneath through an opening in the work support to intermittently advance the fabric relative to the needle; a work trimming means operative above the work support; an operating connection for the trimming means extending down through an oil-sealed opening in the base top; a rotary actuator whereby the needle bar is operated from one of the inter-geared shafts of the actuating mechanism; and a plurality of rotary actuators on the other of said inter-geared shafts for separately operating the looper shafts, for imparting feeding and lift movements to the feed element, and for imparting movement to the operating connection for the trimming means.

14. In a sewing machine, a hollow box-like base containing a supply of lubricating oil and closed at the top by a flat horizontal work support; an endwise reciprocating needle bar extending up from within the base through an oil-tight bearing in the work support; a needle carried by the bar above the work support; a looper to cooperate with the needle beneath the work support; a feed element operative upwardly through an opening in the work support; a presser foot to cooperate with the feed element from above the work support; work trimming means including a knife operative above the work support; an operating connection for the trimming knife extending down through an oil-sealed opening in the base top; actuating mechanism within the base from which the needle bar, the looper, the feed element and the trimmingmeans all derive their movements in properly timed relation; means for lubricating the actuating mechanism from the oil supply within the base; and a retractable protective cover extending over the exposed jortions of the needle bar, the presser means and the trimming means, said cover providing clearance beneath one of its side edges to permit traverse 0f the Work support by the work and a clearance at the front to permit insertion of the work and to enable observation of the needle, the presser foot and the trimming knife.

15. In a sewing machine, a frame including a box-like base with a flat top closure whereof a portion serves as a work support; a reciprocating lneedle bar which extends upward through the top of the base and which at its protruding end carries a needle for movement down through the! work support; a complemental stitch forming instrumentality to cooperate with the needle beneath the work support exteriorly of the base; and mechanism within the base and below the plane of the work support for actuating said needle bar and complemental stitch forming instrumentality including a shaft which extends through an oil-tight bearing in a wall of the base to said instrumentality.

16. In a sewing machine a hollow box-like base with a flat top closure element whereof a portion serves as a work support; stitch forming mechanism including a needle bar'which extends downwardly through oil tight bearing intothe interior of the base, and which at its protruding end carries a needle for movement down through the work support, and a complemental stitch formingA element to cooperate with the needle beneath the-work support exteriorly of said base; vand actuating means for the stitch forming mechanism'including a shaft which is journaled in'an` oil-tight bearing in a wall of the frame. l

17. In a sewing machine a hollow box-like base with a flat top closure element whereof a portion serves as a work support;y stitch forming mechanism including a needle bar which extends downwardly through an oil tight bearing into the interior of the base andwhich at its protruding end carriesa needle for movement down through the work support, and a complemental stitch forming elementto cooperatewith the needle beneath the workl support exteriorly of said base; and actuating means for the stitch forming mechanism lincluding a rotary shaft wholly within vsaid base.

18. In a sewing machine a hollow box-likebase with a flat top closure element whereof a portion serves as a work support; stitch forming mechanism including a needle bar which extends downwardly through an oil tight bearing into the interior of the base and which at itsl protruding end carries a needle for movement down vthrough the work support, and a complemental stitch forming element to cooperate with the needle beneath the work support exteriorly of said base; and actuating means for the stitch forming mechanism including a pair of interconnected rotary shafts one of which is wholly within said base.

19. In a sewing machine, a closed hollow boxlike base with a removable top closure means including a work support; stitch forming instrumentalities including a needle, and cooperating elements at opposite sides of said work support exteriorly of the base; actuating means within the base and operating connections extending up and laterally through oil-tight bearings in the top and in the wall structure of said base direct to said instrumentalities from the actuating means.

20. In a sewing machine, a closed hollow boxlike base with a removable top closure means including a work support; stitch forming instrumentalities including a needle and cooperating elements at opposite sides of said work support exteriorly of the base; actuating mechanism within the base and beneath the work support including operating connections which extend up and laterally through oil-tight bearings in the top and sides of said base direct to said instrumentalities; and a supply of lubricating oil within the base from which vthe moving parts of the actuating mechanism are lubricated by splash action. i

21. In a sewing machine, a closed hollow boxlike base with a top providing a work support; cooperating stitch forming instrumentalities above and below the work support exteriorly of the base; direct supporting and operating connections for said stitch forming instrumentalities extending outward through oil-tight bearings respectively provided in the top and in the side wall structure of said base; and actuating mechanism for said connections including a rotary shaft which is wholly disposed within the base.

22. In a sewing machine, a closed hollow boxlike base with a top providing a work support; cooperating stitch forming instrumentalities above and below the work support exteriorly of said base; direct supporting and operating connections for said stitch forming instrumentalities extending outward through oil-tight bearings respectively provided in the top and in the side wall 'structure of said base; and actuating mechanism for said operating connections including a pair of shafts which are interconnected for synchronous rotation and whereof one is wholly contained within said base.

23. In a sewing machine, a frame with a hollow box-like base containing lubricating oil; a cover element which has an oil-tight perimetric seal with the top of the base and provides a work support; stitch forming, work feeding and trimming instrumentalities, the trimming instrumentalities comprising a` stationary and a movable cutting blade exteriorly of the base above and below the work support; actuating mechanism within the base; operating connections extending through oil-tight bearings in the cover element and in the wall structure of the base from the actuating mechanism direct to the stitch forming instrumentalities; and a link which extends through an: oil-sealed opening in the cover element of the base to the movable blade of the trimming instrumentalities.

24. In a sewing machine, a frame including a hollow box-like base whichserves as an oil reservoir; a cover element sealed oil tight with the top of the base and providing a work support; stitch forming mechanism including a reciprocable needle andv complemental stitch forming instrumentalities located respectively above and below the work support; feeding mechanism including a feed dog which operates through a slot in the work. support; means contained within said hollow base for actuating the stitch forming and l 4feedingmechanisms; and connections extending outward through oil-tight bearings in the cover element and in the side wall structure of the base for imparting movement to the complemental stitch forming instrumentalities.

25. In a sewing machine,'a, frame including a closed hollow box-like base with a top providing a work support; stitch forming mechanism including a reciprocating needle and complemental stitch forming instrumentalities positioned in operative relationship exteriorly of said base; dlrect operating means for said needle and said complemental stitch forming means beneath the work support including members which extend from above and from the side of the base through oil-tight bearings in its wall structure; and partitioning dividing the hollow of the base into two compartments in which the operating means for the needle and for the complemental stitch forming instrumentalities are respectively housed.

NORMAN V. CHRISTENSEN. GEORGE SAUER. NED WALLENBERG.

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