US2063841A - Sewing machine frame - Google Patents

Description

Dec. 8, 1936. H. J. G'oosMAN SEWING MACHINE FRAME Filed April 11, 1934 3 Sheets-Sheet 1 Dec. 8, 1936. H. J. GoosMAN 2,063,841

SEWING MACHINE FRAME 3 Sheets-Sheet 2 Filed April 11, 1934 Dec. 8, 1936. H, J, GOOSMAN 2,063,841

SEWING MACHINE FRAME Filed April 11, 1954 3 Sheets-Sheet 3 lol | i. l lif A gmc/rm erbel J. Goasman murga stares SEWING MACHINE FRAME Application April 11, 1934, Serial No. 719,996

8 Claims.

'I'his invention relates to sewing machines and more particularly to sewing machines of the domestic portable type and has for its object to produce a sewing machine which is compact and exceedingly light in weight.

Another object of the present invention is to provide a frame for such machine having the bearing supports for the operating parts die-cast with the frame and to provide a die-cast frame which requires a minimum of machining.

Another object of the invention is to provide a sewing machine bed having an enclosure in which the loop-taker and feed-actuating mechanism are housed and the loop-taker disposed outside of the housing in a position where the bobbin may be removed and the loop-taker inspected, cleaned and repaired.

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.

The several features of the present invention will be clearly understood from the following description and accompanying drawings:

Figure l is a rear elevation of my improved sewing machine, a portion of the bracket-arm being broken away to show the operating parts and their supports.

Figure 2 is an end elevation lookingfrom the left of Figure 1.

Figure 3 is a bottom plan view.

Figure 4 is an end elevation of the bed and upper and lower stitch-forming mechanisms.

Figure 5 is a sectional view taken substantially along the line 5-5 of Figure 4, the loop-taker and its actuating shaft being shown in elevation.

Figure 6 is a section taken along the line 6-6 of Figure 1.

Figure 'l is a horizontal sectional view of the bed taken in a plane passing substantially through the shaft 35.

The frame of the machine is die-cast in metal of aluminum alloy of high aluminum content. Such an alloy may contain, for instance, from 6 to 8 percent ofcopper and from 2 to 3 percent of silicon with the balance of commercially pure aluminum. Due to the precision with which a frame may be die-cast only a minimum amount of machining, .reaming and drilling are necessary.

As illustrated in the drawingsV the frame of the machine comprises a substantially rectangular shaped bed or base, indicated generally as I0, having a Work-supporting plate II provided on its under face with transversely arranged strengthening ribs I I', downwardly extending side-walls I2 and I3 and end-walls I4 and I5 forming an enclosure. The side-walls and endwalls terminate in a flange portion I6. The end-wall I5 is lrecessed to receive an electrical terminal I1 and the side-wall I3 and end-wall I5 are inwardly offset to form a recess I8 for the reception of an electric motor I9. Fixed to the work-supporting plate II is a motorsupporting bracket 20 formed with a channel 20 which slidably receives the rectangular shaped lug 2i carried by the frame of the motor I9. The lug 2| is adjustably fixed to the bracket 20 by means of a screw 22 which extends through a slot 23 in the bracket 20 and is threaded into the lug 2l. From the above it will be obvious that the motor i9 may be raised or lowered on its support.

Fixed to the hollow bed I0 by the screws 24 is the standard 25 which carries the overhanging bracket-arm 26 terminating in a hollow head 21 carrying the usual reciprocatory needle-bar 28, needle 28', presser-bar 30 and presser-foot 30'. Disposed within and lengthwise of the overhanging bracket-arm 26 is the sewing machine main shaft 32 having a balance-wheel 32 fixed thereto and driven from the motor I9 by the belt 34. The shaft 32 is connected in the usual manner to drive the needle-bar 28 and the looptaker actuating shaft 35 is driven through the gears 36, vertical shaft 31 and gears 31'.

The main shaft 32 adjacent the balance-wheel 32' is carried by the bearing support 25' die-cast with the standard 25. The standard 25, bracketarm 26 and head 21 are die-cast in a single piece and the interior diameter of the bracket-arm 26 is made greater at the end of the arm adjacent the head 21 to facilitate the removal of the core after the casting operation. To support the shaft 32 in the bracket-arm there is provided a bearing support 29 which is iixed in the interior of the arm by a driving fit or by spinning a portion of the metal in the bracket-arm over the bearing support 29 to securely hold it against endwise displacement. As shown in Figures 1 and 6, the aperture in the support 29 through which the shaft 32 extends is oi center, the purpose being to align this aperture with the aperture in the bearing support 25. The arm 28 is cast with a feather 3l which extends into a keyway in the support 29 to prevent the support from turning in the arm.

The loop-taker actuating shaft 35 has one of its ends journaled in a bearing lug 39 die-cast to the offset portion I5a of the end-wall i5 and the other end of the shaft 35 extends through the bearing-lug 40 die-cast to and forming part of the end-wall I4. To the end 35' of the shaft 35 there is secured a loop-taker 4i preferably of the lock-stitch type. As shown in Figures 3, 4, and 5, to protect the loop-taker the cloth-plate il is formed with .an overhanging portion 42 which carries a throat-plate 43 and the bed i0 is provided with a lower extension 44. The loop-taker 4| is disposed in the space between the throatplate 43 and the extension 44.

Also disposed within the hollow bed i0 are rock- shafts 45 and 46 which impart to the feedbar 41 carrying a feed-dog 48 the usual feed-lift and feed-advance and return movements. The rock-shaft 45 is supported on the pivot- lugs 49 and 49 carried by the bearing supports 5D and 50 die-cast with the walls I4 and l5 of the bed l0 and the rock-shaft 46 is supported on the pivot-lugs 5| and 5i carried by the bearing supports 52 and 52' which are also die-cast with the walls I4 and I5 of the bed. The rock- shafts 45 and 46 are actuated by the pitmen 55 and 56, respectively, the pitmen receiving their motion from the usual feed-actuating eccentrics 33 carried by the main-shaft 32.

The overhanging portion 42 of the cloth-plate terminates a little to the left of the Stich-forming and feeding mechanism and to support the work at the left of the stitch-forming mechanism, I have pivotally secured to the corners of the bed I 0 by the screws 51 an extension-plate 58. As shown in Figure 5, the extension-plate 58 abuts the overhanging edge of the throat-plate 43 and the overhang of the cloth-plate 42. By terminating the bed and work-support slightly to the left of the stitch-forming and feeding mechanism and pivoting an extension-plate to the bed so that it may be tilted to the position shown in Figure l the length of the bed of the machine is reduced which is highly desirable in the portable type machine.

Having thus set forth the nature of the invention, what I claim herein isz- 1. A sewing machine having, in combination a bed having depending side-walls and end-walls forming an enclosure, a loop-taker actuating shaft journaled in said bed and having one of its ends extending through one of the end-walls, a loop-taker fixed to the end of the shaft extending beyond said wall in an exposed position outside of the enclosure defined by said side-walls and endwalls, and an extension-plate plvotally secured to said bed, said extension plate being swingable upwardly to provide access to said loop-taker.

2. A sewing machine having in combination, a die-cast aluminum bed having depending sidewalls and end-walls forming an enclosure, a standard rising from said bed, an overhanging bracket-arm terminating in a hollow head and carried by said standard, a loop-taker actuating shaft located within the enclosure formed by the side-walls and end-walls of said bed and one of its ends journaled in a bearing carried by one of the end-walls and its other end extending through a bearing carried by the other of the end-walls to a position beneath the hollow head, a loop-taker fixed to the extending end of said actuating shaft in an exposed position outside of the enclosure defined by said side-walls and endwalls, and mechanism for imparting movement tc said shaft.

3. A sewing machine having, in combination, an overhanging bracket-arm terminating in a hollow-head, a standard carrying said bracketarm and head, a bed supporting said standard and having depending side-walls and end-walls dening a substantially rectangular shaped enclosure, one of said end-walls being disposed in a vertical plane passing through said hollow head, loop-taker and feed-dog actuating mechanism disposed entirely at one side of said end-wall and within the enclosure and a loop-taker and feed dog disposed on the other side of said wall in an exposed position beneath the hollow head.

4. A sewing machine having, in combination, a standard carrying an overhanging bracket-arm terminating in a hollow-head, a base to which said standard is fixed, said base being substantially rectangular in shape and having depending side-walls and end-walls forming an enclosure, one of said side-walls and one of said end-walls being inwardly offset to provide a recess adjacent the standard, a bracket carried by said base, and an electric motor partially received within the recess and adjustably secured to said bracket.

5. A sewing machine having, in combination, a standard carrying an overhanging bracket-arm terminating in a hollow head, a base to which said standard is xed, said base being substantially rectangular in shape and having depending side-walls and end-walls forming an enclosure, one of said side-walls and one of said end-walls being onset inwardly to provide a recess adjacent the standard for the reception of an electric motor, a loop-taker actuating shaft journaled in said base and having one of its ends extending through one of the end-Walls, and a loop-taker secured to the end of the shaft extending beyond said wall and in an exposed position beneath the hollow head.

6. A sewing machine having, in combination, a standard carrying an overhanging bracket-arm terminating in a hollow head, a base to which said standard is fixed, said base being substantially rectangular in shape and having depending side-walls and end-walls forming an enclosure, one of said side-walls and one of said end-walls being oilset inwardly to provide a recess adjacent the standard for the reception of an electric motor, a loop-taker actuating shaft journaled in said base and having one of its ends extending through one of the end-walls, a loop-taker secured to the end ofthe shaft extending beyond said wall in an exposed position beneath the hollow head, and an extension-plate forming a continuation of the bed and pivotally secured to the depending side-walls of the bed whereby it may be swung upwardly about its pivotal connection to a substantially vertical position adjacent said hollow head to provide access to said loop-taker.

7. A sewing machine having, in combination, an overhanging bracket-arm terminating in a hollow head, a standard carrying said bracketarm and head, a base supporting said standard and having depending side-walls and end-walls defining a substantially rectangular shaped enclosure, one of said end-walls being disposed in a vertical plane passing through said hollow head. loop-taker and feed-dog actuating mechanism disposed entirely at one side of said end-wall and within the enclosure, a loop-taker and feed-dog disposed on the other side of said wall in an ex.

posed position beneath the hollow head, and an extension plate pivotally secured to said bed, said extension plate being swingable upwardly to a' actuating mechanism, sewing instrumentalities including a reeiprocatory needle located above said work-supporting plate, a throat-plate iixed to' said work-support, and an extension plate forming a continuation of said work-supporting plate and pivotally secured to said side-walls at points located in a vertical plane passing through said throat-plate, said extension plate abutting the edge of said throat-plate and being shiftable about its pivot points to a substantially vertical l0 position adjacent said hollow head.

HERBERT J. GOOSMAN.

Images