US2973732A - Sewing machines - Google Patents

Description

March 7, 1961 R. A. HAYES SEWING MACHINES 9 Sheets-Sheet 1 Filed 001;. 2. 1957 March 7, 1961 R. A. HAYES SEWING MACHINES Filed Oct. 2, 1957 9 Sheets-Sheet 2 co co n O m N g r N D FIG.2

March 7, 1961 Filed 001;. 2, 1957 FIG.3

R. A. HAYES SEWING MACHINES 9 Sheets-Sheet 3 March 7, 1961 R. A'. HAYES SEWING MACHINES 9 Sheets-Sheet 4 Filed 001;, 2, 1957 March 7, 1961 R. A. HAYES SEWING MACHINES 9 Sheets-Sheet 5 Filed Oct. 2, 1957 March 7, 1961 R. A HAYES SEWING MACHINES Filed 00% 2, 1957 9 Sheets-Sheet 6 3 a 6 6 7 by Ill" MQ i I I wmw M M f FIGJO March 7, 1961 R. A. HAYES 2,973,732

SEWING MACHINES Filed Oct. 2, 1957 9 Sheets-Sheet 7 March 7, 1961 R. A. HAYES SEWING MACHINES 9 Sheets-Sheet 8 Filed 00$. 2, 1957 March 7, 1961 R. A. HAYES SEWING MACHINES 9 Sheets-Sheet 9 Filed Oct. 2, 1957 Un ted States Patent "ic SEWING MACHINES Robert A. Hayes, Franklin Park, Ill., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illinois Filed Oct. 2, 1957, Ser. No. 687,776

8 Claims. (Cl. Ill -163) This invention relates to improvements in sewing machines of the character adapted to produce a so-called safety stitch in work requiring strong seams. The safety stitch, it will be understood, results in the formation of a seam having one or more through and through lines of stitching spaced inwardly from the free edges of two superposed work sections and a line of overedge stitches, of either the two or three thread type, extending around the free edges of the work sections and serving to bind these together.

The through and through stitches made in accordance with the invention may be of any suitable type but are preferably of the two thread chain'stitch type designated type 401 in the Federal Specification for Stitches; Seams; and Stitching. Also the overedge stitching may be of any suitable type but preferablyis of the 502, 503 or 504. type.

A primary purpose of the invention has been to provide a sewing machine which is capable of producing, in one operation, a safety stitch of the foregoing character and which is so constructed and arranged as to provide relatively shortand compact driving connections from a main shaft tothe overedge stitch forming devices.

In its preferred form the machine is provided with a main frame having a work supporting base, a vertical standard and an overhanging arm. An auxiliary frame or housing is secured to the topof the work supporting base and extends upwardly from the latter a minimal distance. This housing together with the major portion of the main frame provides an enclosure formost of the operating mechanism of the machine. A main rotary shaft is provided in the base and connections extend from this to all of the driven parts of the machine. The work feeding mechanism and the means for producing the overedge stitching is largely enclosed withinv the auxiliary housing. Direct and compact connections are provided from the main shaft in the base of the frame to. the overedge stitch forming devices. Also simple and direct connections are provided from said shaft to a rock frame carrying a movable trimmer blade forming part of the mechanism for trimming the free edge of the work as it approaches the stitch forming point. Provision is also made for shifting the movable trimmer head into an inactive position, whenever desired, to facilitate threading of one or more of the loopers.

A special feature of the invention which contributes toward the attainment of the desired compactness ofthe overedge stitch-forming mechanism is the provisionof a rock member arranged to be rocked about a vertical 2,973,732 Patented Mar. 7, 1961 Fig. l is a front elevational view of a machine embodying the invention, portions of the frame and of certain of the mechanism being broken away and shown in section for clarity of illustration;

Fig. 2'is a view similar to Fig. 1 but omits some of the details of the latter and adds a showing of the thread delivering and controlling mechanism;

I Fig. 3 is an end elevational view of the machine, as seen from the left in Fig. 1, with the cover plate of the needle head removed;

Fig. 4 is a view largely in plan, but partially in section, showing the work supporting base of the main frame with the auxiliary housing applied thereto, a cover member for the housing being removed;

Fig. 5 is a detail view showing, partly in longitudinal section and partly in plan, a spreader element and its carrier, together with a bearing sleeve for the latter, forming part of the overedge stitching mechanism; 7

Fig. 6 is a plan view of a looper which may be substituted for the spreader of Fig. 5;

Fig. 7 is an enlarged view of that portion of the work supporting base of the machine which is at the left end thereof in Fig. 1, with the cloth plate removed;

Fig. 8 is a transverse vertical sectional view through the base portion and auxiliary housing of the machine taken along the line 8-8 of Fig. 4;

Fig. 9 is a transverse vertical sectional view through the base of the machine and the auxiliary housingflaken along the line 9--9 of Fig. 4;

Fig. 10 is a detail view, in transverse section through the base of the machine, showing in elevation the work feeding mechanism;

Fig. 11 is a perspective view of a movable work trimming assembly with the trimming blade shifted into inactive position;

Fig. 12 is a perspective View of the movable work trimming assembly, as seen from a different angle than is shown in Fig. 11, with the trimming blade in operative position;

Fig. 13 is an exploded perspective view of a stationary trimming blade and its mounting embodied in the machine;

Fig; 14 is a perspective view of the auxiliary housing of the machine;

Fig. 15 is a plan view of the base of the machine in the region of stitch formation and shows the edge trimming mechanism in relation thereto; and

Fig. 16 is an exploded perspective view of a lubricant pump and associated parts embodied in the machine.

The illustrative machine, in part, bears some similarity to that disclosed in the application of Albert M. Schweda et al., Serial No. 433,937, .filed June 2, 1954, owned by applicants assignee. Certain of the mechanism disclosed herein is similar to that disclosed in said pending application and reference may be had to the latter for further details as to the construction and operation of such mechanism.

Referring now to the drawings, the machine has a main frame comprising a base portion 10 carrying a cloth plate 11 at its top. A vertical standard 12 rises from the right end of the base portion of the frame and carries a horizontally extending, overhanging arm 13 terminating in a needle head 14 disposed above the cloth plate 11. Extending longitudinally of the base of the frame is a main rotary drive shaft 15 which extends outwardly of the frame at its right end (Fig. 1) and carries a combined hand wheel and pulley 16 through which power may be supplied to the machine. Shaft 15 has a crank portion 15a surrounded by a strap at the lower end of a pitman 17 the upper end of which has a strap surrounding a ball pin'extending outwardly from a needle'lever' 18 rockably moun't'ed'on a stud 19 extend ing transversely of the overhanging arm. At its left end the needle lever is connected by a link with a block 21 clamped upon a needle bar 22 mounted for vertical reciprocation in the needle head. The lower end of the -needle bar has a needle clamp which carries a pair of needles 23 and 24, these being spaced suitably from each other both in a direction longitudinally of the base and in a direction transversely of the base.

Needle 23 cooperates with a four-motion looper 25 in the base of the machine for the formation of twothread chain stitches of the 401 type. Looper 25 is mounted on a carrier 26 which is rockable about the axis of a screw stud 27 carried by a sleeve-like member 28 secured to a rockshaft 28a. Rocking movements of the carrier 26 about the axis of the stud 27 are imparted ments are imparted to the looper 25. Needle avoid movements are imparted to the latter by means of anarm 34- clamped upon the shaft 28a and pivotally connected at its rearward end with a pitman having a strap portion 35 (Fig. 7) cooperating with an eccentric carried by the drive shaft 15. By means of the foregoing mechanisms, the needle 23 and looper 25 are caused to produce twothread chain stitches at a suitable distance inwardly of the free edge of work advanced along the cloth plate 11.

Cooperating with the needle 24 in the formation of a line of overedge stitching of the 503 type in an under- -1ooper 36 arranged to a pass a loop of its own thread through the needle thread loop when the needle is starting its upward movement from its lowermost position. Looper 36 is carried by a reciprocatory rod 37 mounted for reciprocation in a bearing sleeve 38 extending through an opening in the left wall (Fig. l) of an auxiliary housing 39. The latter is secured in any suitable way, as by screws or bolts, to the top of the base portion of the main frame of the machine and is provided with an opening in its bottom which is positioned above an opening in the top of the base portion of the main frame 'to provide communication between an enclosed portion of the latter and the interior of the auxiliary housing. Housing 39 is preferably provided with a removable top closure 40 which, when removed, provides access to parts within the housing. As best shown in Fig. 1, the looper rod 37 is inclined at a suitable angle to the horizontal andhas. its upper or inner end connected by means of a link 41 with an arm 42 of a member rockably mounted upon a fixed shaft or stud 43 carried by the auxiliary housing. Link 41 is pivotally connected at its opposite ends with the rod 37 and arm 42. Stud 43ris mounted in alined openings 44 and 45 (Fig. 14) provided in vertical walls of the housing 39. Arm 42, as best shown in Fig. 9, extends upwardly from a sleeve 42a rockable upon the stud 43. Another arm 46 projecting substantially horizontally from the sleeve 42a is connected by a pitman 47 with a spherical crank portion of the shaft 15. The connection at the upper end of pitman 47 with the arm 46 involves a ball pin projecting from the latter. It will be apparent that upon each revolution of the shaft 15 the looper rod 37, and hence the looper 36, will be reciprocated axially in a plane transverse to the line of stitch formation.

A spreader 48 (Fig. 1) carried, by an oscillatory and reciprocatory, horizontally disposed rod 49 is adapted to engage the loop of thread carried bythe looper 36 at a point toward the right of the free edge of the work and to carry this loop into the path of the needle 24 so that the latter may be passed through the loop as the needle descends. As shown in Figs 5, .the spreader 48 is in- 'serted in a hollow portion of the rod 49 and isclamped thereon by a set screw 48a. At an intermediate point the rod 49 carries a block or key 50 which is of spiral configuration lengthwise and has inwardly sloping sides. This block has a downwardly extending stem passing through the rod 49 and is retained in set position by means of a set screw 52 the point of which preferably cooperates with a flattened surface provided on a cutaway portion of the stem 51. Block 50 has sliding engagement with a spiral slot or opening 53 extending through a bearing sleeve 54 which serves to support the rod 49 for reciprocatory movement therein. This hearing sleeve extends horizontally through an opening 55 in one' wall of the housing 39 and it is retained in said opening against sliding or turning movement. At a point toward its inner end, with suitable clearance from the inner or right end of the sleeve 54, the rod 49 carries a collar 56 firmly secured thereto. At its extreme inner end the rod ,49 carries another collar 57 which is also firmly secured thereto.

Washers 58 and 59 are arranged to cooperate wlith the opposed faces of the collars 56 and 57, respectively, and have their own opposed faces spaced to receive and cooperate with forked end portions 61 of an arm 60. The surfaces of the portions 61 of the arm which cooperate with the washers are of cylindrical configuration, as best shown in Fig. 4. Arm projects laterally from a sleeve 62 mounted for oscillation about a fixed shaft 62a (Fig. 8) extendingvertically and carried by the housing 39. At its lower end the sleeve 62 is provided with a horizontally and forwardly extending arm carrying a ball pin 63 which cooperates with a strap at one end of a pitman .64. The opposite end of this pitman has a strap cooperating with a spherical crank portion 65 of the drive shaft It will be apparent that through the connections described each revolution of the shaft 15 will cause a complete oscillation of the sleeve 62 and a swinging movement of the arm 60 in a horizontal plane. Arm 60, in

turn, will reciprocate the spreader rod 49 in the bearing sleeve 54. At the same time, due to the coaction of the block 50 with the spiral opening or slot 53, the rod 49 will be oscillatedabout its axis. The combined movements thus imparted to the rod 49 will carry the spreader 48 from the position in which it picks up the looper thread from looper 36 to the position in which the loop of this thread is in the path of the needle 24, and after the needle passes downwardly through the loop the spreader will then be returned to the position in which it may repeat this operation. In this way a two-thread overedge stitch of the 503 type is formed by the coaction of the needle 24, looper 36 and spreader 48.

If desired, the spreader 48 may be replaced by a thread-carrying looper 66 (Fig. 6). The shank 66a of this may be inserted in the hollow end of the rod 49 and clamped by the screw 48a in the same manner as the spreader 48 is shown clamped in Fig. 5. When the looper is thus substituted, the machine is adapted to produce a three-thread overedge stitch of the 504 type. Thus, after looper 36 has passed a loop of its thread through the loop of needle thread carried by the needle 24, the looper 66 is adapted to pass a loop of its own thread through the loop of thread carried by looper 36 and by virtue of the combined reciprocatory and oscillatory movements of the looper 66, a loop of its thread will be carried up to a position in the path of the needle 24 for entry by the latter on its next down stroke.

In Fig. Z'there is shown the thread guiding and controlling means for a machine adapted to produce a line theyv are first passed to" and: through a threadftensioning device 71 which may be of any suitable construction.

' Needle thread. 67, after passing through the thread.ten-

sioning device, extends to a fixed guide 72 and. thento a guide 73 whichis mounted on the needle lever 18. From here the thread extends to a thread guidef74. atthe top of the needle bar. It then extends downwardly to the eye of. the needle 23. Needle thread 68, after passing through the thread tensioning device 71, is carried through a fixed guide 72a and then to a guide 75 carried by the needle lever 18. From this point the thread extends through an eyelet in a fixed guide 76 and then down to the eye of theneedle 24. Looper thread. 69, after passing. through the thread tensioning device, goes through an eyelet in a fixed guide 77, thenacross a doubledisc rotary take-up 78 of conventional form and from here to the looper 25. Thread 70, after passing through the thread tensioning device, extends througha second eyelet-in the fixed guide 77, then through an eyelet in a. fixed guide 79 and thence upwardly through an .opening in warm 31) secured to the arm which imparts loo'p' seizing and shedding. movements to thelooper 25. From this point the thread 70 extends to a fixed guide 81and from the latter to the looper 36. By the. means described the desired take-up actions and tensions are applied to the several threads. I

Referring now particularly to Figs. 3 and 10, the work feeding mechanism of the machine includes afeed dog. 82. carried by afeed'bar 83 pivotally mounted on a feed rocker 84. The latter is secured to a rock shaft 85 carried. by. the base portion of the. frame of the machine. on itsr'earwardside. A stud 86 projecting laterally from the feed rocker 84, ata' point intermediate theshaft 85.

and the. pivotal connection of the feed bar 83 with the rocljrer, has clamped thereon one end of an arm.87-. The forward end of this arm is pivotally connected with a.

pitman. 88 having astrap portion cooperating through a needle bearing with. a crank pin' 89 mounted for .ad-f justment radially of a member 90secu'red to the main drive shaft 15. As will be understood, variation. in the. feed. stroke o f the feed dog may be effected by'varyin'g the eccentricity of the crank pin 89 in relation to the axisof the drive shaft. .Lifting and lowering movements.

are imparted .tothe feed dog by means of a downwardly. I

extending arm 91 carried by the feed bar 83. The. forward end of arm 91 is. pivotally connected with the lower end et pitman 92 having a strap portionwhich cooperates through aiheedle bearing with an eccentric. 93 secured to the rnainfldrive shaft 15. V The feed dog 82 is given four-motion r'noveniefnts by the mechanism described above and in'thecdufseoffsuch movement passes upwardly through suitable, slots 1 or openings. in a throaf plate 94 (Fig. 4)secure d to a sup-, port 11 attached to the machine frame *and located beneath" the cloth. atell. A presser foot 95 (Fig. 15): cooperates with the throat plate. and the feed dog and serves to retain the work against the latter as theireed' dog is. given itswork advancing movements. The presser. foot is secured to. the lower end ofv a presser bar 96 mounted for vertical movement in a bearing sleeve car; ried by the lower 11 31911 0f the needle head of the machine, as shown in; Fig. 3. A' spring 97 urges the presse'r bar downwardly to retain the presser foot in cooperation withthejthroat plate or the work thereon as' the feed dog impairs, the feed action. Spring 9.7 coacts at itslowef end with a block 9'8' secured. to the. resser bar and. at its. upper end with a shoulder 99 carried by a sleeveor stem having. screw threaded'e ngagement with the top of the needle head. This sleeve or stem may be turned by'a knurled head 100 to vary the height of the shoulder 99 and thusthe downward force imparted by the spring 97 to the presser bar.

of' the pointiaf which" the" overedge' stitches are applied thereto. Thi's mechanisrn is'bestshownin Figs; 11, 1'2",

1'3 and 15, but portionsof it are shown in other views.

It" comprises a lower. stationary blade 101 (Fig. 13") mounted in an inclined'channel in a support 102. The

heightlo'f the' blade in relation to the cloth plate and its secured in set' position by a plate. 103 and a screw10'4. Support102ha's' a laterally extending block portion 105' adapted to be secured to the throat plate support 110 of the machine by; means" of a screw 196. The latter extends through arr-elongated. opening 107 in. the block 105 to enable adjustment of the latter in a direction transverset'o the line of stitch formation. This permits some variation in the location of the trimmingblade 101 ina direction transverse to the line of stitching. Screw I06 cooperates with a screw threaded opening 108 in the-throat plate support 11a. The latter has rigidly secured thereto a forked downwardly extending member 109' which cooperates with a grooved portion 11061 of a screw element 110. When the clamping screw 106 is released slightly the screw element 110 may be turned and by virtue of its screw threaded engagement with the block 105' will serve to shift the latter to effect the adjustment mentioned.

The movable trimmer blade which cooperates with blade 10'1.i n trimming the edge of the work is carried by a rock frame 111 which is rockably mounted on an enlarged portion 112 of .a stud having areduced portion 113'; adapted to be. inserted in an opening 114 (Fig. 14) in the housing. 39.. A set screw or the like may be provided'tolock the stud in any set position. Portion 112 of the stud is disposed eccentrically of the axis of portion 113. Therefore, upon turning of the stud by the application of a screw driver to its head 115, the axis aboutwhich the-frame 111 is rocked may be varied. slightly. A.washer 112a (Fig. 11) serves as a spacing and wear receiving element between the adjacent end ofthe rock frame/.111. and the wall of the housing 39.

Frame 111 has a forwardly. extending head 116 provided with laterally. spaced bearing lugs. These are provided with alined openings to receive a rock shaft 117t0 which is secured ablock 118. The latter is fitted in the space between the bearing lugs of the head 116 and is provided with a slight rearward extension 119 providinga lip or shoulder adapted to rest on the topof the head. when theparts are in operative position, as shown in Fig. 12. Block 118 and its supporting shaft 117 are normallyurgedinto this position, toward the left in Fig. 12,. by a.spring-120. To enable the movable cutter and itssupporting means to be rocked upwardly into the position shown in-.Fig. .11 to facilitate threading of one or. more of the loopers provided in the machine, the head 116 is provided with a vertically disposed channel 121 of slightly greater width than the block 118 so that when the. latter is shiftedtoward the right (Fig. 12) against the action of springlZt), the lip 119 or the block will be free of the. top surface of the head 116 and may be swung of corresponding configuration on the forward face of the block 118. This enables the blade carrier to be ad fir X's: has been indicated, the machine'is provided:withr edgestrimmihgmechanismiwhich serves to trim the free justed along the. forward face of the block 118 to correspond with any adjustment of the stationary blade 10 1 in a direction transverse to the line of stitch formation. A spring plate.124, secured by a screw 124a to the block 113, serves to lock the carrier 122 in any adjusted position on the block. When the carrier 122 is in operative position its rearward face engages the adjacent lug of the head 116 to hold the carrier in definite relation to said head. Carrier 122 is provided with an inclined channel for receiving a -blade 125 'adapted to be clamped in the channel in desired position by means of a block 126 and its retaining screw 127.

- Rocking of the frame 111 is effected through a downward extension 128 of the latter which is pivotally connected with the rearward end of a pitman 129. This pitman has a strap portion at its forward end surrounding a needle bearing cage 130 which in turn surrounds and cooperates with an eccentric 131 carried by the main drive shaft 15. Thus on each revolution of the shaft the frame 111 will be given a complete oscillation to carry the movable blade 125 downwardly and upwardly in relation to the stationary blade 101. Spring 120 serves to urge the end of the blade 125 yieldingly against the stationary blade 101 to maintain the blades in proper cutting relation. As shown in Fig. 15, a downwardly inclined chip guard 132 is preferably provided on the base of the main frame of the machine to receive the chips or strips trimmed from the edge of the work and discharge these forwardly and downwardly,

' The machine is preferably provided with means for effecting automatic lubrication of the various relatively sliding or moving surfaces requiring lubrication to minimize Wear. For this purpose a lubricant reservoir is provided in the base portion of the main frame of the machine, including that part beneath the vertical standard and that part beneath the auxiliary housing 39. The parts within the enclosed portion of the frame are lubricated by mist created through the action of various parts of the mechanism on the body of lubricant maintained in the reservoir mentioned. Parts outside of the enclosed portion of the frame are lubricated through tubing and wicking. In use, the machine is preferably placed on an oil pan which serves to collect lubricant which may drip from theparts receiving lubrication, particularly those outside of the enclosed portion of the frame. Means are provided in the machine for picking up the collected lubricant from the pan and returning it to the reservoir. This means. is best illustrated in Fig. 16, but is partly shown in Figs. 1 and 4. It comprises a pump housing 133 in the form of a block which is secured by screws 134 to the frontwall of that portion'of the base of the frame which is beneath the housing 39. Block 133 is provided with a cavity 135 of the configuration shown in Fig. 16. pair of gears 136 and 137 which act as a pump. Gear 136 is carried by a shaft 138 which extends through an opening 139 in the rear wall of the cavity and has secured thereto, adjacent the rear face. of the block, a gear 140. The latter meshes with a gear 141 carried by a sleeve 142 which is secured to the main drive shaft 15. This sleeve, as best shown in Fig. 1, may serve also to couple, in axial alinement, two portions of the shaft 15. .It will be understood that this shaft is divided into several sections to facilitate assembly in the frame. Gear 136 is thus driven. from the shaft 15 through the connections described. In turn it drives the gear 137 mounted on a short shaft 143 which is retained in an opening 144 in the rear wall of the block 133. Preferably the gear 137 is free to turn in relation to the shaft 143. Lubricant is delivered to the pump chamber through an opening 145 in the bottom of the block 133, this opening communicating with a tube 146 the opposite end of which is connected by a nut 147 with the threaded upper end of a tube or pipe 148 extending through an opening in a closure disc 149. The latter fits into an opening through the bottom of the reservoir described above and is secured to the base of the frame by a plurality of screws 150. The opening through the disc 149 communicates with the oil pan (not shown) mentioned above. The pump housing is closed on its forward side by a plate 151 secured to the block 133 by means of screws 152. Oil picked up by the gears 136, 137 through the tube 146 and openings 145 will be discharged from the pump chamber through an opening 153 in the top of the block 133 and thus delivered into the reservoir.

, Oil guards are preferably provided in the reservoir for preventing discharge of lubricant collected from'the mist In this cavity there is mounted a in the enclosed housing through various openings, such as those in the bearing sleeves 38 and 54 in which the looper rods 37 and 49 .are reciprocated. One such guard is shown at 154 in Fig. 1. Another such guard is shown at 155 in Fig. 4.

Whilean illustrative machine embodying the invention has been disclosed in considerable detail, it will be understood that various changes may be made in the construction and arrangement of various parts without departing from the principles and scope of the invention as defined by the appended claims.

What is claimed is:

1. In a sewing machine having means for producing a line of through and through stitches in a plurality of work sections adjacent a free edge thereof and means for simultaneously producing a separate line of stitching over the edge of said work sections, the combination which comprises a main frame having a base provided with a horizontally disposed work supporting surface, an auxiliary housing mounted on said base and communicating therewith, a rotary drive shaft in said base, a plurality of axially reciprocatory shafts mounted in said housing, each disposed at least partially above said work supporting surface and carrying a stitch forming element, and connections from said drive shaft to said reciproca tory shafts for axially reciprocating the latter, said connections comprising a rock member arranged for rocking movement about a vertical axis for reciprocating one of said reciprocatory shaftsr 2. In a sewing machine of the character set forth in claim 1, said rock member having an arm extending substantially horizontally therefrom and arranged to cooperate with said one of said reciprocatory shafts for reciprocating the same.

3. In a sewing machine of the character set forth in claim 2, means on said one of said reciprocatory shafts providing spaced radially extending shoulders thereon, said horizontally extending arm having vertically disposed cylindrical surfaces arranged to cooperate with said radially extending shoulders for positively shifting said shaft in opposite directions.

1 4. In a sewing machine of the character set forth in claim 1, said rock member being mounted for oscillation in said auxiliary housing, and direct connections from said rotary shaft to said rock member for oscillating the latter about its vertical axis.

In. a sewingmachine of the character set forth in claim 1, said auxiliary housing and a portion of the base of the main frame forming a substantially lubricanttight enclosure, ,and said rock member being disposed within said enclosure partially within said portion of the baserand partially within said housing.

6. Ina sewing. machine of the character set forth in claim 5, saidenclosure being arranged to retain lubricant at a desired level, a gear pump within said enclosure 1 mounted on said portion of the base of the main frame,

said pump having an inlet extending through the bottom of said enclosure and an outlet above the lubricant level therein and serving to introduce lubricant into said enclosure from a point below said portion of the base of the main frame.

. 7. ,In.a sewing machine having means for producing a line ofthrough and through stitches in a plurality of work sections. adjacent a free edge thereof and means for simultaneously producing a separate line of stitching over the edge of said work sections, the combination which comprises a mainframe having a base provided with a horizontally disposed work supporting surface, an auxiliary housing mounted on said base and communicating therewith, portions of said housing extending below said work supporting surface, a rotary drive shaft in said base, a plurality of axially reciprocatory shafts mounted in said housing, each disposed at least partially above said work supporting surface and carrying a stitch forming element, and connections from said drive shaft to said reciprocatory shafts for axially reciprocating the latter, said connections comprising a plurality of rock members, one for each of said reciprocatory shafts, said rock members being mounted in said auxiliary housing and each being journaled at least in part below said work supporting surface. I

8. In a sewing machine of the character set forth in claim 7 an edge trimming mechanism for said work sections comprising a stationary blade and a rock frame carrying a movable blade in the region between said auxiliary housing and the line of stitch formation, connections from said drive shaft to said rock frame for rocking the latter and causing said movable blade to cooperate with said stationary blade and trim the edges of the work sections, said movable blade carrying rock 15 2,834,309

frame having a disengageable connection with said movable cutting blade whereby the latter may be shifted into an inoperative position and away from said stitch forming elements carried by said reciprocatory shafts.

References Cited in the file of this patent UNITED STATES PATENTS 1,528,499 Moffatt Mar. 3, 1925 1,587,957 Huber June 8, 1926 1,640,201 Maier Aug. 23, 1927 1,949,073 Gruman et al. Feb. 27, 1934 2,596,728 Sauer et al. May 13, 1952 2,704,042 Wallenberg et al. Mar. 15, 1955 Russell et a1. "1 May 13, 1958

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