US2276246A

US2276246A - Sewing machine

Info

Publication number: US2276246A
Application number: US300903A
Authority: US
Inventors: George A Fleckenstein
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1939-10-24
Filing date: 1939-10-24
Publication date: 1942-03-10
Anticipated expiration: 1959-03-10

Description

March 10, 1942. e. A. FLECKENSTEIN SEWING MACHINE v Filed Oct. 24, 1939 v 4 Shee ts-Sheet 1 GEORGE A. FLEckENsTE/N G. A. FLECKENSTEIN 2,276,246

SEWING MACHINE Filed on. 24, 1939 -March 10,' 1942.

4 Sheets-Sheet 2 GEORGE A. FL EOKEWS TE'IN March 10,- 1942. e. A. FLECKENSTEIN SEWING MACHINE Filed Oct. 24, 1939 4 Sheets-Sheet 3 GEORGE A. FLECKEIVSTE/IV March 10, 1942.

5. A. FLECKENSTEIN 2,276,246

SEWING MACHINE Filed Oct. 24, 1939 4She ets-Sheet 4 Patented Mar. 10, 1942 UNITED STATES PATENT oFFlca sewmo MACHINE George A. Fleckensteln, Stratford, Conn., assignmto The Singer Manufacturing Company, Elizabeth, N. 1., a corporation of New Jersey Application Octobcr 24, 1939, Serial No. 300,903

V, belt-pulley, the latter being carried by an outboard projection of the main-shaft.

An object of the present invention is to provide a simplified arrangement of shafting and gearing for such a machine within the limited space available in the machine frame, using a small high speed motor with a small driving pulley belted to a balance-wheel on a main-shaft so located as to afford a belt drive of adequate length while keeping the rim-of the balancewheel above the base-plate of the machine upon which'the bed. is fastened.

With the above and other objects in view, as 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 features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

f the accompanying drawings, Fig. l is a longitudinal vertical section through a sewing machine embodying the invention. Fig. 2 is a bottom plan view of the machine with the bottom or base-plate removed from the machine bed. Fig. 3 is a transverse vertical section through the bed and bracket-arm standard. Fig. 4 is a transverse vertical section through the machine bed, showing the bracket-arm head and needlemechanism therein in elevation. Fig. 5 is a transverse vertical section substantially on the line 5-5, Fig. 2, and Fig. 6 is a transverse vertical section substantially on the line 6-6, Fig. 2.

The machine is formed with a frame including the box bed I and overhanging bracket-arm with a vertical standard 2 and horizontal portion 3 terminating in the head 4. The open bottom of the bed I is closed by the bottom or baseplate 5.

the clip-belt to the bottom free-ended rotary shaft. I3 which is disposed directly below the bracket-arm and is journaled in bearing lugs I4, I5 between the ends of the shaft I3 in the bed I.

Mounted on the free end of the bottom rotary shaft I3, remote from the clip-belt I2, is at least one of the feed-eccentrics, preferably the feedlift eccentric I6, which is embraced by the feedbar I! carrying the feed-dog [8. The feed-bar I1 is fulcrumed at its rearward end upon the pin I9 carried by the feed-rocker which is journaled on the pivot-shaft 2| fixed in lugs in the bed I.

Connected to the pin I3, Fig. 6, is one end of the link 22 the opposite forked end of which pivotally carries a cross-pin 23 which is free to 25 fulcrumed at 26 in the bed I and rocked by the feed-advance eccentric 21 on the bottom shaft I3. The stitch-length may be regulated, oreven reversed, by-shifting the link 22 to carry the cross-pin 23 toward or across a position of axial coincidence with the yoke-fulcrum 26.

Such regulation may be effected by movement of the feed-regulator lever 28 which is frictionally fulcrumed at 29 in the bed I and connected by the link 30 to the link 22. v

Complemental to the needle 8 in the formation of stitches is the loop-taker or rotary hook which is a cup-shaped body carried by the vertical hook-shaft 3| and formed with a loop-taking beak 32. Within the hook-cup is disposed the usual stationary bobbin-case 33 which carries the usual bobbin or under thread mass, not shown. This bobbin-case is restrained against rotation with the hook by means of the usual rotation-restraining tongue 34, Fig. 1, which freely enters a 'notch in the under side of the throat-plate 35. I

The vertical hook-shaft. 3| carries the spiral a gear 40 of equal size on'the bottom rotary shaft l3. The rotary hook preferably makes two revo- The bracket-arm head 4 carries the usual.

lutions to one revolution of the bottom'shaft I3. \The machine is preferably provided with a bobbin-case opener or kicker 4|, Fig. 4, which is pivoted at 42 in the bed I and actuated by the eccentric 43 on the countershaft 38. At the time when the needle-loop which has been cast about the bobbin-case 33 is being drawn up by the take-up I0 and is about to be drawn between the rotation-restraining tongue 34 and theengaged wall of the notch in the under sideof'the throat-plate, the kicker 4| engages the shoulder 44, Fig. 4, on the bobbin-case and turns the bob bin-case slightly or enough to open a gap or passageway for the needle-loop adjacent the tongue 34. a

Journaled highrin the bed I, in rear of the bottom rotary shaft I3, is the main-shaft 45. The main-shaft carries a small pinion 46 which meshes with the larger gear on the shaft IS. The main-shaft also carries the balancewheel and belt-pulley 41 which is connected by the belt 48 to the small pulley 49 on the shaft 50 of the small high-speed motor 5| disposed in the bed I, in front of the bottom rotary shaft I3. The balance-wheel 41; Fig. 1, due to the high position of the main-shaft, does not drag or encroach upon the base-plate 5, yet is of adequate size to effect a material speed reduction by the belt-connection 48. The speed-reducing

gears

46, 40, effect a further speed reduction enabling the machine to be operated at a moderate speed from a small high-speed electric motor within the bed I.

By mounting the balance-wheel on a shaft which is geared down to the sewing machine mechanism, the weight of the balance-wheel may be reduced below the dictates of conventional practice, without loss of the necessary balancing effect required for slow operation of the machine, as in embroidering and darning operations. This is an important advantage in an electrically driven family type machine where the driving motor is permanently connected in driving relation with the machine and must be started and held at the desired running speeds by manual operation of the usual rheostatic controller furnished with such machines.

Having thus set forth the nature of the invention, what I claim herein is:

1. A sewing machine having a bed and over-- connection between said bottom and top rotary shafts, a main-shaft journaled in said bed, a balance-wheel carried thereby, and speed-reducing gearing connecting said main-shaft to drive said bottom rotary shaft.

2. A sewing machine having a bed and overhanging bracket-arm, a reciprocatory needle, a complemental loop-taker, a work-feeder, means interconnecting said needle, loop-taker and workfeeder to cause them to operate in timed relation to each other, a conventional small high-speed electric motor in said bed, a small driving belt pulley thereon, a balance-wheel shaft in. said bed, a balance-wheel and belt-pulley thereon, a belt-connection between said pulleys, and speedreduction gearing in said bed between said balance-wheel shaft and said means.

3. A sewing machine having a box-type bed and overhanging bracket-arm, a reciprocatory needle and top rotary needle-driving shaft carried by the bracket-arm, a lower rotary shaft connected to drive the top rotary shaft, a gear on said bottom rotary shaft, a vertical axis rotary hook complemental to said needle, a hook-driving countershaft parallel to said bottom rotary shaft and driven one-to-one by the gear on the latter, two-to-one gearing connecting said vertical axis rotary hook to said hook-driving countershaft, work-feeding mechanism including feed-eccentrics carried by said lower rotary shaft, a mainshaft journaled high in said bed, a balance-wheel on said shaft externally of said bed, and a pinion on said shaft meshing with said gear on said bottom rotary shaft.

4. The construction set forth in claim 3 with the hook-driving shaft set lower than and forwardly of the bottom rotary shaft which latter is set lower than and forwardly of the main-shaft.

5. A sewing machine having a box-bed, a hollow standard rising therefrom and an overhanging bracket-arm carried by said standard, top and bottom shafts journaled, respectively, in said bed and bracket-arm, a belt connection in said standard between said shafts, feed-eccentrics on said bottom shaft, feeding means actuated by said eccentrics, a reciprocatory needle actuated by said top shaft, a rotary hook-shaft journaled vertically in said bed beyond one end of said bottom shaft, 8. countershaft journaled in said bed forwardly of said vertical hook-shaft and bottom rotary shaft and geared to both of said last mentioned shafts, and a main-shaft journaled in said bed and geared to said bottom shaft.

6. A sewing machine having a box bed and overhanging bracket-arm, a bottom rotary shaft journaled in said bed directly below said bracketarm, a reciprocatory needle carried by said bracket-arm, needle-driving mechanism actuated by said bottom rotary shaft and located within said bracket-arm, an electric motor disposed in said bed in front of said bottom rotary shaft, a main shaft journaled in said bed in rear of said bottom rotary shaft, a balance-wheel carried thereby, a speed-reducing belt-connection between said motor and main-shaft externally of said bed, a reduction gear connection between said main shaft and said bottom rotary shaft within said bed, work-feeding mechanism in said bed including feed eccentrics on said bottom rotary shaft, and a loop-taker complemental to said needle located in said bed and actuated by said bottom rotary shaft.

7. A sewing machine having a bed and overhanging bracket-arm, afree-ended lower rotary shaft journaled in said bed, feed-eccentrics carried by said lower rotary shaft at least one of which eccentrics is at one free end of said shaft, work-feeding mechanism actuated by said eccentrics, a reciprocatory needle carried by said bracket-arm, means at the other free end of said lower rotary shaft connected to drive said needle, a loop-taker in said bed complemental to said needle in the formation of stitches, a countershaft parallel to and driven by said lower rotary shaft for actuating said loop-taker, and a mainshaft in said bed and connections for driving said lower rotary shaft therefrom.

8. A sewing machine having interconnected stitch-forming and work-feeding mechanisms and including a machine shaft for driving said mechanisms, a balance-wheel shaft, speed-reducing means permanently connecting said balance-wheel shaft and said machine shaft,

whereby said balance-wheel shaft is caused to l run faster than said machine shaft, a balancewheel on said balance-wheel shaft, and an electric motor permanently connected at all times to drive said balance-wheel shaft at a speed less 7 than the motor speed.

GEORGE A. FLECKENSTEIN,