US2324598A - Sewing machine - Google Patents

Description

July 20, 1943. Y G. sAuER SEWING MACHINE Filed Aug. 22, 1940 3 Sheets-Sheet l I N VEN TOR:

WI TN ESSES:

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' July2o,1943. G. SAUER 2,324,598

SEWING MACHINE Filed Aug, 22, 1940 -5` sheets-snede f jffl l 17 26 WJTNESSEZ 9 l INVEIOR; j f5 George Quer, )f N @mw/@wx 'QL' l ATTORNEYS.

` July 2o, 1943. G. SMH-:R`

y SEWING MACHINE Filed Aug. 22, 1940 s sheets-sheet 5l I N V EN TOR:

George ,Sauer,

A TTORNE YS.

NO. 312,898 led by `machine and which is driven f plate.

on the lower shaft.

Patented July zo, 1943 SEWING MACHINE Y George Sauer, Berwyn, Ill.,

assignor to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application August 22,

3` Claims.

Y This invention relates to sewing machines, and is especially concerned with means whereby the timing, i. e., the operative relation between thev 1940seria1N0. 3535.647

feed` and the stitch-forming instrumentalities may be adjusted.` More specifically the inven tion has reference to lock stitch sewing machines of` a fully-enclosed, self-lubricating type such as disclosed in a copending patent application Serial rotaryvshaft which extends into the base 'of the from the upper shaft `base which is closed at the bottom, with interposie tion of a sealing gasket, by a removable cover terials when excessive delay in the active or workadvanclng movement of the feed will be attended by entry of the needle into the material before the active feed stroke is completed. It thus belcomes necessary to frequently change the feed timing to adapt the machines for operation upon diiferent materials.

' For the purpose of changing the timing in lock stitch sewing machines of the specific type hereinbefore referred to, it has been the custom of the adjusters to rotatively shift the drive gear Wheel disposed within the frame of the sewing machine as to be readily accessible without necessitating the removal of the oil-sealed bottom cover ofthe machine base. i

` below a throat plate Other objects and advantages will appear from the following detailed description of the attached drawings, wherein Fig. lis a View partly'in front elevation and partly in longitudinal section, of a sewing machine conveniently embodying my invention.

Fig. 2 is a view partly in elevation and partly in section taken as indicated by the angled arrows II-II in Fig. 1.

Fig. 3 is a fragmentary View in horizontal section taken as indicated by the angled arrows III-III in Fig. 2. f

Fig. 4 is a fragmentaryview showing the elevation of the lefthand end of the machine, with the front cover of the needle head removed to expose the parts at the interior; and I Fig. 5 is a perspective view of the means whereby the timing of the machine may be adjusted.

The construction of the illustrated sewing machine is substantially like that disclosed in the copending application to which reference has already been made in that its frame has a hollow base I whereof the top 2 serves as a work support, anda communicating hollow standard 3 which sustains a hollow arm 4 above the work, said arm terminating in a hollow needle head 5. As shown, the end of the head 5 is closed by a cover 6 held in place by several screws l, see Figs. l and 2. Confined to endwise reciprocation in guide bushings 8 and 9 in the top and bottom of the head 5 is a bar IU in the lower protruding end of which aneedle I I is secured. Cooperating with the needle II in stitch formation in a well known manner I2 recessed into an extension of the ztop of the work support 2 immediately beneath the head 5, is a rotary hook I3 of appropriate design. By means of set screws I 4, the rotary hook I3 is adjustably secured to the protruding end of a shaft I5 which extends into the base I, and which, through a pair of gears shown at IE in Fig. 3 is rotated from a horizontal shaft -to and from movements are communicated to the fee-d dog i8. The component 25 of the link has a pivotal connection at 2'I with a lazy bar 23 which is suspended from the end of an arm 29 on a regulating shaft in the machine base I. By rotative adjustment of the shaft 39 in a well known manner, the horizontal or feeding stroke of the feed dog I8 can be increased or decreased, or reversed. Extending downward from the feed bar 20 is an arcuate arm 3|, which, through a drop link 32, is connected to a small crank 33 at the lefthand or outer end of the shaft I'I, whereby the necessary up and down or lift movements are imparted to the feed dog I6. As shown in Figs. 2 and 3, the feed b-ar I8 extends through an opening 35 in the front side wall 36 of an offset portion 3l of the base I, a fluid tight seal being formed by flexible washers 38 on said bar which are pressed against the inner face of said wall at the region of said opening, by a leaf spring 39. Reactive upon the feed dog I8 incident to feeding is a presser foot 40 at the lower end of a presser bar 4I which extends upward into the needle head 5 and which is subject to the downward pressure of a spring 42 within said head, see Figs. 2 and 4. By this means partly shown in Fig. 4 and comprehensively designated by the numeral 63, the presser foot 40 may be lifted as required from time to time during the sewing.

rThe drive mechanism of the machine includes a horizontal upper shaft l from which the feeding and stitch-forming instrumentalities derive their movements either directly or indirectly as As shown, the shaft 45 is journalled within the arm li and protrudes through a bearing 45 at the righthand end of the machine frame where it carries a combined hand and belt wheel 4l. Through a train of spur gears 48, i9 and 5E! Within the standard 3, rotation is communicated from the upper shaft 45 at unison speed and in the same direction to the lower shaft Il. From Fig. 1 it will be noted that the upper shaft 45 extends through a bearing 5I a cross partition 52 within the arm 4 into the head 5; and mounted on the end of said shaft within the head is a rotary actuator or crank member 53 from which the needle bar Eil is reciprocated endwise through a pitman 55.

In practice, a supply of oil is maintained in 3i! also journalled withlthe base i of the machine at the level conventionally indicated in Figs. 1 and 2 for the automatic lubrication of the moving parts in the manner described in the aforementioned copending application, said base being closed at the bottom by a removable screw-secured cover plate 56 with interposition of a compressible gasket 5l' to ferm a fluid tight seal. The purpose of this construction is to enable access to the interior of the base in the event that part replacements should beco-me necessary.

Heretofore changes in the timing of the feed relative to the movement of the needle in a sewing machine such as has been described were accomplished by rotatively shifting the drive pinion 59 on the lower shaft I'I, which, as has been already explained elsewhere herein, entailed the removal of the cover plate 56 and breaking of the seal 5l. This undesirable and time consuming procedure is avoided in accordance with my invention as a consequence of the following construction:

As shown in Figs. l, 4 and 5, the rotary actuator 53 consists of two components which are respectively designated by the reference characters 60 and El. The component 6i! is in the form of a sector shaped enlargement and may be either integrally constructed with the upper or needle shaft 45 at the distal end of the latter, or welded thereto, said plate having an arcuate slot 62 in concentric relation to the shaft axis. The component 6I is mounted on the needle shaft 45 immediately behind the component 60 with capacity for rotative shifting thereon and is weighted as at E3 to counterbalance the needle bar I0 and the pitman 55. The shank of a headed clamp screw 65 passes through the slot 62 in the component 6l] and threadedly engages into the component 6I to normally secure said components in fixed relation. As shown, a set screw 66 is provided for securing the component 6I against accidental displacement on the shaft 45 after its adjustment. The eccentric or crank pin 61 to which the upper end of the pitman 55 is connected is carried at the end of a short arm 58 whereof the fulcru'm stem Vor shank 69 is rotatively adjustable in the crank component 6I and Xable in adjusted screws 'I0 and 1I. The pivot stud 12 (Fig. 1) whereto the lower end of the pitman 55 is coupled with the needle bar I0, engages a vertical guide way said bar against rotation. take-up of the machine, indicated at 15 in Figs. 4 and 5 is connected to the stud 69 and its movements modified by virtue of being pivotally connected at 'i6 to an arm 'I1 which rocks on a fixed axis 'I8 within the needle head 5. Y

From the described construction it will be seen that for changing the timing of the machine, instead of taking off the bottom cover plate 56 of the base, it is merely necessary to remove the two upper screws 1 which secure the needle head cover E and to swing said cover aside on the third screw when access can be immediately had from the exterior to the clamp screw 65 of the rotary actuator 53. Upon loosening the clamp screw E5, the component 6I is shifted about the upper shaft 45 relative to the component 69 until the desired new operative relation between the movements of the feed dog I8 and the needle II is attained. Then, if necessary, the rotary hook I3 may be re-timed by shifting it circumferentially about its shaft I5 Vupon loosening of the set screws I4. Finally, with the screws 65 and I4 re-tightened, the head cover 6 is replaced and secured. The timing adjustment is thus easily and quickly accomplished without loss or possible contamination of Ythe oil supply within the base.

Having thus described my invention, I claim:

1. In a sewing machine, a feeding element; a drive shaft; means deriving motion from the shaft for actuating the feeding element; a needle; mechanism for actuating the needle including a two-part crank member whereof one component is rigid with and forms one end terminus of the shaft and has a flat surface of relatively large area transverse to the shaft, and whereof the other component is counterweighted and rotatively adjustable on the shaft, carries the crank center and has a flat transverse surface of relatively large area in frictional contact with the flat surface 'of the rigid component; and clamp means for releasably securing said adjustable component to said rigid component, and a pitrian connecting the crank member with the nee- 2. In a sewing machine, a frame which has a base, a standard rising therefrom and an overhanging arm supported by the standard and terminating in a hollow needle head with a removable end cover; a feeding element; a needle and a carrier bar therefor conned to-endwise moveposition by a pair of setr 'I3 within the needle head to restrain The needle threadment in the needle head; a drive shaft journaled on the arm and extending into the needle head; means deriving motion from the shaft for actuating the feeding element; and mechanism for actuating the needle including a two-part crank member whereof one component is rigid with and forms the terminus of the shaft within the head and has a fiat surface of relatively large area transverse `to the shaft, and whereofthe other component is counterweighted and rotatively adjustable on the shaft, carries the crank' center and has a flat transverse surface of relatively large area in frictional contact with the flat `surface of the rigid component, clamp means accessible from the exterior upon retraction of the needle head cover for releasably securing said adjustable component to said rigid component, and a pitman connecting the crank member with the needle bar.

3. In a sewing machine, a needle; a complemental cooperating stitch-forming instrumentality; a feeding element; a drivershaft; .means deriving motion from the drive shaft for actuating the feeding element; means deriving motion from the drive shaft for actuating the complemental stitch-forming instrumentality in definite timed relation with the needle; and actuating mechanism for the needle including a two-part crank member whereof one component is rigid with and forms one end terminus of the shaft and has a ilat surface of relativelylarge area transverse to the shaft, and whereof the other component is counterweighted and rotatively adjustable on the shaft, carries the crank center, and has a at transverse surface of relatively large area in frictional contact with the flat surface of the rigid component, and clamp means for releasably securing said adjustable component to said rigid component. Y

GEORGE SAUER.V

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