US2206285A - Sewing machine - Google Patents

Description

Sheets-Sheet 1 R. KAIER SEWING MACHINE Filed July 9, 1957 July 2, 1940.

R. KAIER SEWING MACHINE July 2, 1940. l

Filed July 9. 1937 s sheets-sheet 2 varv July 2 1940- R. KAIER SEWING MACHINE Filed July 9,' 1957 6 Sheets-Sheet 5 6 Sheets-Sheet 4 R. KAIER SEWING ACHIHE Fld July 9, 1937 July 2, 1940.

rtw/114244 qui/Waals:

July 2, 1940. R. KAIER 2,206,285

` sswme cama Filsd July 9, 1957 6 Sheets-Sheet `5 R. KAN-:R

SEWING MACHINE sind .my 9. 1957 July 2, 1940.

6 Sheets-Sheet 6 Patented July 2, 1940 PATENT OFFICE SEWING MACHINE Richard Kaer, Cranford, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application July 9, 1937, Serial N0. 152,707

15 Claims.

This invention relates to sewing machines and more particularly to high speed lock-stitch machines, and has for one of its objects the provision of an improved lubricating system which will properly lubricate the actuating parts of the machine when the machine is operating.

Another object of the invention is to provide improved mechanism which is actuated by the knee of the operator for lifting the presser-foot.

A further object of this invention is to provide a new and novel means for supporting the machine on a power-table and to provide an improved base upon which the sewing machine rests.

With the above and other objects in view,`as`

l5 will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several l0 features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings: lFigure 1 is a vertical section taken through i5 the center of the machine.

Figure 2 is a top plan view of the bracket-arm with a cover-plate removed to show the actuating mechanism for the feed.

Figure 3 is a bottom plan view of the mechai0 nsm below the bed.

Figure 4 is a vertical section taken substantially along the line 4-4 of Figure 1.

Figure 5 is a vertical section along the line 5-5 of Figure 1, certain parts being shown in i5 elevation.

Figure 6 is an enlarged face View of the takeup and needle-actuating mechanism located within the hollo'w head. v

Figure 7 is a vertical section through the 0 bracket-arm taken along the line 1--1 of Figure 2.

Figures 8 and 9 are sectional views taken substantially along the lines 8--8 and 9-9 of Figure 2, showing the eccentrics for actuating the feeding mechanism. 5 Figure 10 is an enlarged sectional view taken substantially along the line lil-I0 of Figure 3.

Figure 11 is a plan view showing the screen.4

which covers the oil pump.

Figure 12 is a vertical section taken through D the feed eccentrics.

Figure 13 is a disassembledperspective view of the eccentric for imparting a feed-and-return movement to the feed-bar.

Figure 14 is a top plan view of the oil reservoir.

i Figure 15 is a perspective view of the supporting plate for the Wicks used to lubricate the mechanism in the head of the machine.

In the embodiment of this invention selected for illustration, represents the top of a powertable which carries plates 2| and 22 through 5 which the bolts 23 pass (Fig. 4). The bolts 23 also pass through the ears 24 (Fig. 14) formed on an oil pan or reservoir 25, and the nuts 26 hold the ears against the lower edge of the top 20.

The upper edges of the walls of the oil pan l0 are formed with a groove 23 and seated ln the groove is a relatively thick gasket 21 of resilient material. Shallow slots `24 are also provided to drain oil which may seep into the groove 23 back into the reservoir. The machine has a bed 28 15 formed with depending side Walls 29 and end Walls 30 and 30. 'Ihese side and end walls form an enclosure and their lower edges rest upon the gasket 21 thereby forming a closed container.

Rising from the bed 28 is a standard 3| carry- 20 ing a bracket-arm 32 which terminates in a hollow head 33. Journaled in the bearing bushings 34y 35, and the self-aligning ball-bearing 36 is a main actuating shaft or needle-bar shaft 31 carrying the usual balance-wheel 3B formed with 26 the usual belt groove 39. Secured to the end of the shaft V31 which extends into the hollow head is a crank-disk 4U carrying a crank-pin 4| which actuates the link 42' of the needle-thread take-up mechanism 42 (Fig. 6). Carried by the 80 crank-pin 4| is a second crank-pin 43 which is embraced by one end of the pitman 44, the other end of the pitman being operatively connected to the needle-bar 45 which is journaled in the bearings 46 and carries aneye-pointed needle 41. i Interposed between each of the crank-pins 4 I and 43 and the ends of the pitman 44 and link 42 are a series of small rollers or needle bearings 49 which serve to reduce friction between these elements and the crank-pins. Also jour- ,E naled in bearings in the hollow head is the usual spring-urged presser-bar 5||carrying a presserfoot 5|. l

Fixed to the shaft 31 by a set-screw 53 is a disk 54 which slidably` carries a plate 55 having an eccentric 56 made integral therewith. Carried by and rotatable relative to the shaft 31 is a.

second eccentric 51 which extends into the centrally located aperture 56' in the feed-advancing eccentric 56. The aperture 56' is elongated 50 transverse of the direction of movement of the plate 55. Made integral` with the adjusting eccentric 51 is a disk 58 formed with a slideway 58 which receives a slidable locking plate 50 formed with teeth 6| which are adapted to enf l1/2 is to 2.

gage the teeth 62 on a. disk 63 formed on the feedlift eccentric 64 which is made integral with a gear 65 and fixed to the shaft 31 by a set-screw 66. The disk 58 is provided with a stud 61 which carries a spring 68 onel of the ends of which reacts against the shoulder 69 of the locking plate 60 and the other end reacts against the periphery of the 'disk 58. The action of the spring 68 urges the plate 60 so that the teeth 6| and 62 are normally in en gagement. In order to more effectively lock the disk 58 and eccentric 51 to the disk 63 and eccentric 64 when the machine is operating at high speed the end 10 of the .plate 60, which is on the opposite side of the shaft 31 from the teeth 6|, is made heavier than the end carrying the teeth so that centrifugal force will assist in holding the teeth 6| and 62 in engagement.

The feed-lift eccentric 64 actuates the 'pitman 12 which is connected to an arm 13 on the rockshaft 14 (Figs. 3 and 4).. The feed-advance eccentric 56 actuates a pitman 15 which is connected to the arm 16 on the rock-shaft 11. A feed-dog 18 which cooperates with the presser foot 5| to advance the material is carried by a feed-bar 19, which has one of its ends pivotally connected to the upstanding arms on the rockshaft 11 and its other end operatively connected to the arm 83 on the rock-shaft 14. From the above it will be obvious that the eccentric 64 will impart to the feed-dog 19 a. rising-and-falling movement and the eccentric 56 will impart a feed-and-return movement to the feed-dog. In order that the operator may vary the amount of feeding movement imparted to the feed-dog. a shouldered plunger 85 extends through an opening in the wall of the standard 3| and is spring urged outwardly by means of the spiral spring 86 which reacts between the wall of the standard and the shoulder of the plunger. A split ring 8l' enters a groove in the plunger to limit the outward movement of the plunger. To adjust the feed-advance eccentric the operator pushes the plunger 85 inwardly and rotates the balancewheel 38. When the notch 88 in the disk 58 is opposite the plunger 85 the end 85 of the plunger enters the notch and engages the locking plate 60 (Fig. 9) and slides it against the action of the spring 68 so that the teeth 6| are disengaged from the teeth 62 thereby unlocking the disk 58 from The disk 58 and adjusting cam 51 are held stationary by the end 85 of the plunger 05 and when the shaft 31 is turned the movement of the eccentric 51 shifts the plate 55 and eccentric 56 in a right line and relative to the shaftv secured to the vertical shaft is a second geary 92 which meshes with a gear 93 fixed to one end of a hook-shaft 94 which is journaled in the bearings 96 and 96 carried by the bed 28, and there is secured to the other end of the shaft a hook 95 of the well known lock-stitch type. The gear ratio between the gears 65 and 89 is as 1 is to 11/2 and the ratio between the gears 92 and 93 is as Therefore the hook 95 makes two complete revolutions for each reciprocation of the needle.

To ood lubricate the machine a centrifugal oil pump is driven by the vertical shaft and is located below the level of the oil in the sump 25 of the reservoir 25. This pump comprises an impeller 9 9 fixed to the vertical shaft 90 and a casing |00 which surrounds the impeller and is held in position by arms |0| which are fixed to the bed of the machine. A plate |03 provided with an intake aperture |04 and a screen |05 is secured to the casing |00. A conduit pipe |06 (Fig. 4) conducts the oil discharged by the pump to the bushing 35 from which it is delivered through the aperture |01 in the bushing 35 and radial duct |08 to the longitudinal bore |09 ln the shaft 31.

The bearing bushing 34 is lubricated through a radial duct |0 which delivers oil to the end of the bushing nearest the hollow-head andthe shaft 31 is formed with a spiral groove l which forces the oil along the bushing and back into the bracket-arm. If any oil should leak from the front of the bushing, it is caught and returned through the bushing by the conduit |2.

To lubricatethe take-up and needle-bar actuating mechanism which are located within the hollow head a supporting plate |3 having turned up edges ||3 (Fig. 15) extends through an aperture in the arm 32 and communicates with a well I4 closed at the top by a cap I5. This plaie is held in position by a screw ||9 which extends through the upper portion of the hollow head. Wicks I6 have their ends located in the well |4 and their other ends threaded through pipes ||1 which depend from the plate ||3, the ends of the wicks extending slightlyl below the lower ends of the pipes. This holds the ends of the wicks in such a position that; the oil is wiped off by the moving parts within the hollow head. Oil is supplied to the wicks by means of two ducts ||8 in the bushing 34. When the machine is operating the oil is under pressure due to the centrifugal pump and the action of the spiral groove in the shaft 31. This pressure causes the oil to rise through the ducts |8 and saturate the wick' H6. The excess oil ows over the ends of the Wicks down through the Well I4 (Fig. '1) and is drained back into the bracket-'arm through a conduit |20 arranged longitudinally of the bushing 35.

The shaft 31 is provided with radial ducts |2|, |22 and |23 which communicate with the bore |09 and supply oil to the feed-actuating eccentrics and gear 65. The shaft 31 `is provided with circumferential grooves |24 and |25 communicating with the ducts |2| and |22 (Fig. 12). 'I'he groove |24 constantly conducts oil to the holes |26 and |21 which supply oil to the bearing surface of the feed-advancing eccentric 56. The groove |25 communicates with a hole |28 which supplies oil to the feed-lift eccentric 64.- The ducts |23 feed` an excess of oil .to the gear 65 and are partially closed bythe hub of the gear 65 so that some of the oil is fed to the face of the gear 65' (Fig. 12) from which it is thrown by cen trifugal force to the teeth of the gear. The upturned flange |29 (Fig. 1) of the bushing 9| catches some of the excess oil and conducts it between the shaft 90 and bushing 9| for the purpose of lubrication. The bushing 9| is also formed gears and eccentrics and the oil is fed through the duct |33 to the bearing surface of the bushing 96'.

'Ihe front bushing for `the shaft 94 is lubricated from an open topped receptacle l|34 (Figs. 3 and 4) carried by the bed of the machine. This receptacle collects the excess oiland it is con veyed to the bearing surface of the bushing 96 by a tube |35 (Figs. 3 and 10) and oil hole |36. To prevent the oil from` escaping at the hook end of the bearing the shaft 94 is formed with a spiral groove |31 which conveys the excess oil back into the reservoir 25.

To indicate whether or not the pump is working properly and oil is being. supplied to the bearing surfaces a cup-shaped member |38 is inserted in the standard 3| of the machine (Fig. 4). 'Ihe member |38 is provided with an aper- `ture |39 in its top wall and an aperture |40 in its bottom wall. The inside of the member |38 is painted white andit is provided with a transparent cover |4|. When the machine is operating, excess oil is thrown off by the moving parts and some of this oil ows down the inner side of the standard 3 I, through the aperture |39 and out through the aperture |40. The operator by simply glancing at the member |38 when the machine is operating can tell whether or not the lubricating system is in operation.

In order that the feed-rock shafts 14 and 11 may be readily assembled in the machine the end wall 30 is provided with two inserts |68 and |69 (Figs. 3 and 10) which are detachably held in place by screws. To prevent the oil from running along the rock-'shafts and throughA the opening in the wall 30 through which they pass these rock-shafts are each provided with oilslings |10. 'Ihe needle-bar shaft 31 is also provided with an oil-sling |1| (Fig-1) which is adapted to sling the oil into the groove in the bushing 34 from whence it is conducted back into the arm of the machine through the conduit ||2. A sling |12 is also provided to prevent an excess of oil from passing'to and through the bearing 36.

To provide knee-control means for raising and lowering the presser-foot there is formed on the reservoir' a lug |50 and an arm |5| in which is journaled a rock-shaft |52. Adjustable stops |53 and |54 carried on the ends of the shaft limit its movement in either direction. Fixed to the 'shaft |52 intermediate its bearings is a lever |55 which is adapted to be engaged by the knee of the operator and' adjustably secured to the shaft is an arm |56 which engages one end of a rod l|51 extending through a suitable aperture in a boss |58 formed on the reservoir 25. The boss |58 extends above the lever of the oil in the reservoir a'nd the rod |51 is provided with a cap |51' to prevent oil that may splash on therod from running down and through the aperture in the boss. 'I'he other end of the rod |51 engages one end of a lever |59 which is secured, intermediate its ends, by a pivot-pin |60 to the ears |6| of a member |62 fixed to the bed 28 of the machine. The other end of the lever |59 is connected to one end of a rod |63 which has its other end connected to a lever |64 pivoted at |65 to the arm 32 of the machine and urged to its normal position by a spring |65. The lever |64 is connected to the presser-bar `by a link |66 in the usual and well known manner. From the above description it will be obvious that the operator may raise or lower the presser-'foot by shifting the lever |55.

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improved sewing machine will be clearly and fully understoodr It is apparents that such a machine has awide variety of uses,` and it will be understood that the form, construcs.:

tion and arrangement of the elements employed may be varied. Therefore, the privilege is re,- served of resortingto all such legitimate changes therein as may be fairly embodied within the spirit and scope of the appended claims.

Having thus set forth the nature of the inven`` tion, what I claim herein is: i

1. A sewing machine having in combination, a frame, operating mechanism journaled therein, means for supplying oil to and through some of said mechanism and in `excess of the amount required, an indicator carried by the frame of the machine, and means for causing some of the excess oil to flow through said indicator after it has been thrown oif by said mechanism.

2. A sewing machine having in combination, a frame, operating mechanism journaled therein, means for automatically supplying oil to and through said mechanism and in excess of the amount required, an indicator carried by the frame of the machine, said indicator comprising a cup-shaped member with an opening at its top and bottom to permit some of the excess oil which is thrown off by said operating mechanism to pass through said member.

3. A sewing machine having in combination, a frame including a bracket-arm and head, a shaft journaled in bushings in said bracket-erm, take-up and needle-bar actuating mechanism located within said head, an oil reservoir, means for supplying oil during the operationY of the machine from said reservoir to a well in one of the bushings carrying said shaft, a supporting plate located in the head of the machine and wicks carried by said plate, said wicks having their ends extending into the well in said bushing and their other ends in a position to beengaging by the needle-bar and the take-up actuating mechanism.

4. In combination, an oil pan having upturned edges, a sewing machine frame carried thereby and having a bed formed with depending side and end walls which rest upon a sound absorbing gasket carried by the upturned edgesof .the oil pan to form an oil `tight enclosure, one of said end walls forming a partition, lower stitch-forming and feed actuating mechanism located on one side of said partition and within the enloA usfr

closure, and a rotary hook, feed-bar and feeddog and shafts having movement about their longitudinal axes extend through the partition and connecting said hook and feed-bar tothe actuating mechanism within the chamber located on the other side of said partition and outside of the enclosure.

5. In combination, a table-top having an opening therein, an oil pan formed with upturned edges and secured to said table-top and located beneath said opening, a sewing machine frame having a bed formed with depending side and end Walls which extend through the opening inl said table-top and rest by gravity upon said pan to form a lubricant chamber, the top of said sew- `ing machine bed being flush with the table-top, stitch-forming instrumentalities carried by said frame and located outside of said lubricant chamber and at one side of one of the end Walls formed on the bed, and mechanism carried by said frame for actuating said instrumentalities, said mechanism being located on the other side of the en d wall and within the lubricant chamber.

6. In combination, an oil pan mounted beneath an opening in a table-top, a gasket of soundabsorbing material resting on said oil pan, a sewing machine with a frame including a bed which extends through said opening and is seated upon said gasket, said frame having no direct metallic connection with the oil pan and being free to vibrate relative to said pan, the oil pan and frame forming a dust and lint proof chamber which houses the actuating-mechanism of the sewing machine.

7. A sewing machine having, in combination, a frame including a bracket-arm and a hollow head, a bushing carried by said frame and located adjacent said hollow head, said bushing being formed with an oil well, a needle-bar actuating shaft journaled insaid bushing and formed with a longitudinal bore, an oil reservoir, a pump for supplying oil from said reservoir through the bore in said shaft to the well in said bushing, take-up actuating mechanism located within said hollow head and a wick having one of its ends depending in said well and its other end in a position to be engaged by said take-up actuating mechanism.

8. A sewing machine having, in combination, a frame including a bracket-arm and a hollow head, a bushing carried by said frame and located adjacent said hollow head, said bushing being formed with an oil well, a needle-bar actuating shaft journaled in said bushing and formed with a longitudinal bore, means for supplying oil to the bore in said shaft, radial ducts leading from the bore in said shaft to the bearing surface of said bushing, ducts in said bushing connecting the bearing surface with said well, a spiral groove on said shaft for forcing oil through said ducts and into said well, needle-bar and take-up actuating mechanism located within the hollow head, and wicks having their ends depending in said well and their other ends held in a position to be engaged by the take-up and needle-bar actuating mechanism. l

9. A sewing machine having an arm terminating in a hollow head, take-up and needle-bar actuating mechanism located within said head, a plate having a portion .which extends into an opening in said arm, a plurality of depending pipes carried by said plate, wicks having their ends threaded into said pipes and their other ends extending into the arm of said machine and means for supplying oil during the operation of the machine to the ends of the wicks which ex- -tend into the arm.

sewing machine may vibrate relative to said pan without imparting said vibrations to the oil-pan and the table by which it is supported.

11. In combination, an oil-pan mounted beneath an opening in a table-top, sound absorbing material carried by said pan, a sewing machine with a frame including a bed which extends through said opening and rests upon said sound absorbing material, said frame having no direct metallic connection with the oil-pan and being free to vibrate relative to said pan, the oil-pan and frame forming a dust and lint proof chamber which houses the actuating mechanism of the sewing machine and means within said chamber .for lubricating the actuating mechanism of the sewing machine.

12. In combination, a table-top having an opening therein, an oil-pan formed with upturned edges and secured to said table-topand located beneath said opening, a sewing machine frame having a bed which extends through the opening in said table-top and rests upon said pan, the top of said sewing machine'bed being flush with the table-top, and a layer of vibration absorbing material interposed between said bed and said pan, said sound absorbing material forming the sole support of said sewing machine.

13. In combination, an oil-pan having upturned edges, a sewing machine frame located above said oil-pan and forming with said oilpan a dust and lint proof chamber, sewing machine actuating mechanism located within said chamber, said mechanism including a needle-bar actuating shaft formed with a longitudinal bore, three bearings in which said needle-bar shaft is journaled, a pump also located within said chamber, means for supplying oil under pressure from said pump to the middle bearing for said needle-bar shaft, eccentrics carried by said needle-bar shaft, ducts for conducting the oil from said longitudinal bore to the bearing surfaces of said eccentrics, a gear carried by said shaft, and a duct located relatively to said gear so as to conduct oil from said longitudinal bore to the face of said gear from whence it is thrown to the teeth of said gear by centrifugal force.

I4. In combination, a sewing machine table having an opening therein, an oil-pan secured to the under side of said table beneath said opening'forming therewith a pocket, a sewing machine having a bed formed with depending side and end walls which are received in said pocket and rest by gravity upon said oil-pan, a resilient gasket disposed between said pan and said depending side and end walls, and means carried by said machine for supplying oil from said oil-pan to the actuating mechanism of the machine.

l5. In combination, an oil-pan having upturned edges, a sewing machine having a bed formed with depending side and end walls which cooperate with said bed to form a chamber, means within said chamber for supplying lubricant to the actuating mechanism of said machine, and means for pivotally securing said machine so that it may be tilted relative to said pan about a point located above the lower edges of said depending side and end walls.

RICHARD KAIER.

Images