US2891494A

US2891494A - Sewing machines

Info

Publication number: US2891494A
Application number: US648578A
Authority: US
Inventors: Hacklander Hans
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1955-12-19
Filing date: 1957-03-26
Publication date: 1959-06-23
Anticipated expiration: 1976-06-23
Also published as: FR1168209A; GB809648A; US2896560A; CH358317A; GB809645A; US2947270A

Description

June 23, 1959 H. HAcKLAN DER SEWING MACHINES Filed March 26, 1957 2 Sheets-Sheet 1 mi' 1 l l N VE N TO R Hans Hack/ander June 23, 1959 H. HACKLANDER SEWING MACHINES 2 Sheets-Sheet 2 Filed March 26, 1957 INVENTOR Hans Hack/ander '2,891,494 Patented June 23, 1959 SEWING MACHINES Original application December 19, 1955, Serial No. 553,806. Divided and this application March 26, 1957, Serial No. 648,578

2 Claims. (Cl. 112-18).

The present invention relates vto sewing machines and has for a primary object to provide a smoother running sewing machine that is adapted for high speed operation, is substantially vibration free, noiseless, more durable and dependable, and is relatively simple and economical.

More particularly, the present invention is directed principally to a sewing machine of the hosiery seamer or cup-feed type having a vertical axis main shaft as in applicants prior Patent No. 2,518,987; One of the features of the present invention is -in the provision of a feed eccentric mounted on a power imput shaft of such a machine rather than on the main shaft, thus relieving the intermittent load of 4the feed mechanism from the main shaft and the drive connections for the main shaft.

Another feature of this invention is in the provision of an improved counterweight which is oflsimplilicd construction that facilitates manufacture and assembly.

Having in mind the above and otherl objects that will be evident from an understanding of this disclosure, the invention comprises the devices, combinations and arrangements of parts as illustrated inl the presently preferred embodiment of the invention which is hereinafter set forth in `such detail as to enable those skilled inthe art readily to understand the function, Operation, construction and advantages of it when read in conjunction with the accompanying drawings in which:

Fig. l is a vertical sectional view of` asewing machine embodying the present invention.

Fig. 2 is a horizontal Isectional view taken substantially on the line 2-72 ofFig. 1.-

Fig. 3 is a horizontal sectional on the line 3 3 of Fig. l.

Fig.V 4` is a fragmentary verticall sectional View taken substantially on the line 4-4 of'Fig. 3.

FigpS is a detail sectionalV viewl showing the counterweight in top plan. Y

The present invention isv illustrated-in the drawings as. embodied in the sewing machine forming the subject matter of my prior application Serial No. 553,806 of which the present application is a division.

The machine illustrated in the drawings comprises a frame 1 having a vertically disposed hollow standard 2 carrying a laterally extending bracket arm 3. The hollow interior of the standard 2 comprises an oil-tight splash-lubricated compartment 4 which is closed at the top by a horizontal partition 5 and at the bottom by ya base plate 6.

A vertical axis main shaft 7 is journaled for rotation within'the splash-lubricated compartment 4 in an upper bushing 8 mounted in the partition 5 and a lower bushing 9 mounted in a lug 10 extending inwardly from the side wall of the standard 2. At its upper end, the main shaft 7 extends through the bushing 8 to the exterior of the frame where it has mounted thereon a hand wheel 11.

The main shaft 7 is held against vertical movement by a collar 12 and the hub of a gear 13 which are mounted on the main shaft 7 and engage the upper and lower view talien substantially nited States Patent ends, respectively, of the lower bushing 9. The main shaft 7 is driven by the gear 13 which meshes with a gear 14A onV a horizontal axis power ixnput or drive shaft 15l that is journaled for rotation in the splashlubricated compartment 4 at one end in a bushing 16 mounted in a bearing lug 17 in the side wall of the standard and at the other end in -a bushing 18 mounted in a partition 19. The partition 19 forms one wall of a belt pulley compartment 20. The drive-shaft 15 extends through the bushing 18 into the belt pulley compartment 20 where it has mounted thereon a belt pulley 21 having a belt 22 entrained about the same by means of which belt power is delivered to the machine.

The stitching mechanism of the machine includes an endwise reciprocating, horizontally arranged needle-bar 23' journaled in a bushing 24 in a dat front wall 25 of the standard and carrying a needle 26 at its front end. At its other end the needle bar 23 is connected by a pitman 27 to a crank 28 on the main shaft 7 whereby longitudinal reciprocation is imparted to the needle bar 23 upon rotation of the main shaft 7. A thread-carrying Ilooper 29 is mounted upon the end of a looper bar 30 journaled for oscillation in a bushing 31 extending through a bearing lug 32 in the wall 25. The looper bar 30 is arranged in a horizontal plane at an acute angle to the needle bar 23. Oscillation is` imparted to the looper bar 30 by a crank arm 33 mounted upon the end of the looper bar 30 within the ysplash-lubricated compartment 4, which crank is connected by a pitman 34 to an leccentric 35 on the main shaft 7. A second threaded looper 36 cooperates with the needle 26 and looper 29 in the formation of three-thread overedge chain stitches. The looper 36 is mounted upon the end of a looper bar 37 journaled for oscillation in a bushing 38 extending through a bearing lug 39 in the wall 25. The looper bar 37 is arranged in the same horizontal plane as the looper bar 30 and upon the opposite side of the needle bal: 23 from the looper bar 30, The looper bar 37 is at an acute angle to the needle bar 23 and at substantially a right angle to the looper bar 36. Oscillation is imparted tothe looper bar 37 by a crank arm 40 mounted upon the end of the looper'bar 37 within the splashlubricated'compartment 4, which crank is connected by a pitman 41 to an eccentric 42 on the main shaft 7.

The feeding mechanism of the illustrated machine comprises a pair of opposed feed cups including an inner feed cup..43 and an outer feed cupy 44. The inner feed cup 43 is mounted upon the end of a vertical axis feed shaft 4S journaled in: the standard 2. A gear 46 is mounted upon the lower end of the feed shaft 45 within the` vsplaslrlubricated compartment 4. The gear 46 meshes with a gear 47 on the lower end of a vertical axis feed actuating `shaft 48 journaled at its lower end in a bushing 49 in a bearing lug 50 in the wall of the standard 2 and in a bushing 51 in the partition 5. Intermittent one-way rotation is imparted to the feed actuating shaft 48 by a one-way clutch 52 having a crank arm 53 connected by a pitman 54 to an adjustable eccentric 55 on the drive shaft 15. The upper end of the feed actuating shaft 48 extends through the bushing 51 into the hollow interior of the bracket arm 3` and has mounted thereon a pulley 56 that is connected by a belt 57 with a pulley 58 on the upper end of 4a feed shaft 59 upon the lower end of which the outer feed cup 44 is mounted. Thus, the intermittent one-way rotation imparted to the feed actuating shaft 48 by the clutch 52 is transmitted to the inner feed shaft 45 by the

gears

46 and 47 and to the outer feed shaft 59 by the belt 57 and

pulleys

56 and 58. To provide for adjustment of the eccentricity of the eccentric 55, there is a threaded plug 60 in a cover plate 61 on a side wall of the standard 2. The standard 2 is formed with a planar side Wall at the cover plate 61 that is substantially parallel to the drive shaft so that when the cover plate 61 is removed, the internal mechanism is conveniently accessible through the opening.

In comparison with the prior art constructions, such as shown in my above-mentioned Patent No. 2,518,987, placing the feed eccentric 55 on the power imput or drive shaft 15 as distinguished from the vertical axis main shaft 7, not only provides a neater and more convenient arrangement from the standpoint of access for adjustment, repair or replacement, but also gives a better balanced design and removes the intermittent load of the feed from the

gears

13 and 14 `which connect the drive shaft to the main shaft.

Balancing of the present machine is further improved by a counterweight, designated generally at 62, which is vsecured to the main shaft 7. The counterweight 62 comprises a hub 63 having an aperture 64 through which the main shaft 7 passes, an arm 65 extending radially from the hub 63, and a weight 66 at the end of the arm 65. The counterweight 62 is `divided longitudinally into -two substantially equal complemental parts 67 and 68,

each including a portion of the hub 63, arm 65 and Weight 66, and secured together by screws 69. The depth of the portion of the aperture 64 in each of the parts 67 and 68 is less than one half of the diameter of the main shaft 7 so that when the counterweight is positioned on the main shaft 7, the adjacent faces of the parts 67 and 68 contact along a line parallel to the axis of the main shaft 7 and at the extreme end of the weight 66, designated in Fig. 5 at 70, and diverge toward the main shaft 7. Thus, as the screws 69 are tightened, the two parts 67 and 68 pivot about the line 70 and the two 4halves of the hub are drawn toward each other against the main shaft 7 to clamp the counterweight in position of the main shaft 7. The counterweight can be readily adjusted or can be mounted on or removed from the -main shaft 7 simply by backing oif the screws 69, thus separating the two parts 67 and 68.

Numerous alterations of the structure herein disclosed i will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure Y relates to a preferred embodiment of my invention which is for purposes of illustration only and not to be construed as a limitation of the invention. All such modications which do not depart from the spirit of the insaid main shaft and said drive shaft for imparting rotation to said main shaft upon rotation of said drive shaft,

needle mechanism and looper mechanism supported by said standard and adapted4N to cooperate to perform a stitching operation, operative connections between said main shaft and said needle and looper mechanisms to impart actuations to the latterrupon rotation of said main shaft, an intermittently actuated feeding mechanism car- `ried by said frame for advancing work past said needle and looper mechanisms, said feeding mechanism comprising a pair of feed shafts journaled in said frame, a pair of opposed feed cups carried by said feed shafts, a feed actuating shaft journaled in said frame, operative connections between said feed shafts and said feed actuating shaft for imparting rotation to said feed shafts upon rotation of said feed actuating shaft, and means for imparting adjustable intermittent one-way rotation to said feed actuating shaft including an adjustable eccentric on said -drive shaft and a pitman connecting said eccentric to said one-way clutch.

2. In a sewing machine of the cup-feed type, a frame including a vertically disposed hollow standard and a bracket arm surmounting said standard, a vertical axis main shaft journaled in said standard, a horizontal axis drive shaft journaled in said standard, operative connections between said main shaft and said drive shaft for imparting rotation to said main shaft upon rotation of said drive shaft, needle mechanism including a horizontal axis needle bar journaled in said standard for endwise reciprocation, looper mechanism including a looper bar journaled. 4in said standard for oscillation, said needle and looper mechanisms being designed to cooperate in the formation of chain stitches, operative connections between said needle bar and looper bar and said main shaft for actuating said needle and looper mechanisms in timed relation through a stitching cycle, feeding mechanism 4including a pair of vertical axis feed shafts jour naled in said frame and a pair of opposed feed cups carried by said feed shafts, a vertical axis feed actuating shaft journaled in said frame, operative connections be- Vtween said feed shafts and said feed actuating shaft for imparting rotation to said feed shafts upon rotation of said feed actuating shaft, and means for imparting adjustable intermittent one-way rotation to said feed ac tuating shaft comprising a one-way clutch on said feed actuating shaft, an adjustable eccentric on said drive shaft, and a pitman connecting said eccentric to said oneway clutch.

References Cited in the Ie of this patent UNITED STATES PATENTS