US1438076A - Circularly-moving-hook sewing machine - Google Patents

Description

G. WOELFEL AND W. HOFF- CIRGULA'RLY MOVING HOOK SEWING MACHINE.

APPLICATION FILED MAR. 2,1921- 1,438,76. I Patented Dec. 5-, 1922.

IIIIIIIIIWIIIII/IlfYI/I/I JVETN ESSES:

MNUWSKWWWMD ATTORNEY 25 by the needle-clamp 26 is the needle 27 which cooperates in a well known manner with the circularly moving hook or looptaker 6 inthe formation or stitches. its so far described the construction and operation does, not differ substantially from that disclosed in the Diehl and Grieb patent re f-erred to, the loop of needle-thread being passed about the threadcase in substantially the same manner as in that of the patented construction. v

' According to the present improvement the bobbin case holder is provided with a latch or spring-member 28 the flattened end of which is apertured to receive the reduced head 15 of the pin 15 while its other end is reduced in width and formed with depending sides 28.. Intermediate its ends the spring member 28 is fixedly secured to the holder by the screw 29, the aperture 29 through which the screw passes being slightly larger than the shank of the screw to permit a slight lateral adjustment of the holder 14 relative to the spring-member about the pivot 15'. The free end of the spring-member 28extends over the flange 12 of the loop-taker 6' and enters a notch 30 formed injthe work-support 1 adjacent the cover-plate spring 31. Theholder 14- retains the thread-case 10 in position upon and restrains it from movement with the oscillating looptaker 6, but the threachcase is not in contact with the holder except. at or nearits oppositeends or horns against one or the other of which the thread-case will rest lightly. The point of contact between the loop-discharging or heel portion 10 of the thread-case l0 and the holder 14: is afforded by a buffer spring 32 secured to the holder by a screw 83 the free end of the buffer spring being spaced from and embracing the end of the holder. The yield ing contact between the buffer-spring 82 and the thread-case serves to lessen or deaden any noise which might be occasioned during the passage of the thread-loops be- "tween these parts.

During the normal operation of the machine, the thread-case 10 and holder 14 occupy-the position shown in Fig. 2; that is, the free end of spring-member 28 is seated within and maintained in the notch 30 of the work-support and thereby retains the thread-case 10 supported upon the flange 12 of the lo0p-taker 6. If for any cause, IltlS desired to remove the thread-case from the loop-takenwhich might be necessary when the flange and groove connection between the two become clogged or jammedby obstructions, or when access is desired to the cavity in the sewing machine work-support in which the lower thread-handling clevicesare located, the free end of the spring-member 28 may be raised by ascrew-driver or finger nail clear of its notch 30 in the Work-support and shifted to the right, as illustrated in Fig. 3. This will provide sufiicient clear ance between the holder 14 and the threadcase 10 to permit the latter to be displaced transversely of the axis of movement of the loop-taker or in a direction parallel with its plane of movement so that the flange 12 of the loop-taker 6 will clear the peripheral groove 11 of the thread-case 10 and permit the latter'to be removed from the field of action of the loop-taker. After the threadcase has been removed from its operative position within the loop-taker, the groove 11 of the thread-case and the flange 12 of the loop-taker may be readily cleared of any obstruction such as lint or thread ends which may have prevented the free movement of the loop-taker about the tl1readcase. Removal of the thread-case will also give free access to the cavity 2 in the work-support to facilitate the removal of any foreign matter which may have found lodgment upon the bracket 3. v v

To restore the thread-case 10 in operative relation with the loop-taker, it is lowered into position until its groove 11 is opposite the flange '12 of the loop-taker. when by a slight lateral movement, the flange of the loop-taker will again be engaged by the groove in the thread-case whereupon the holder-14 is shifted to the left until the 1 free end of the spring member or latch 28 drops into the notch 30 of the work-support. The parts are thenagain in the posit-ion shown in Fig.2 in the proper, relation for a sewing operation;

In assembling. the lower thread handling mechanism in the sewing machine work-support, the clearance between the buffer spring 32 and the loop discharging or heel portion 1.0 of the thread-case 10 must be regulated to a nicety to maintain quietness in operation while afl'ording a free passage for the lower limb of the needle-thread loop as it is cast about the thread-case, and drawn up by the take-up. In the machine of the present improvement this is readily accom plished by loosening the fastening screw 29 entering the holder 14, the aperture 29- in the spring-men'1ber'28 being larger than the shank of the screw, and shifting the holder the requisite amount relative to the spring-member 28 until the desired amount taker, and a latch carried by said holder to permit its displacement relative to said thread-case. v v

2. In a sewing machine, in combination, a work-support, a circularly movable looptaker housed within a cavity in the worksupport, a thread-case having at one side a bearing in and supported by said looptaker, aholder positioned within the field of action of said loop-taker and having a portion adapted for engagement with the other side of said thread-case to confine it to said bearing and restrain it from movement with the loop-taker, and a springmember secured to said holder and in operative engagement with said'worlesupport to permit displacement of said holder relative to said thread-case favorable for the removal of said thread-case from said looptaker.

3. In a sewing machine, in combination, a work-support, a circularly movable looptaker housed within a cavity in the worksupport, a thread-case having at one side a bearing in and supported by said loop-.

taker, a holder positioned withinthe field of action of said loop-taker and having a portion adapted for engagement with the other side of said thread-case to confine it to said bearing and restrain it from movement with the loop-taker, and a springmember secured to said holder with its free end entering a notch in the work-support within the field of action of said loop-taker for retaining the thread-case in cooperative:

relation with the'loop-taker, a stationary stop for retaining the holder in operative position, and means whereby said holder; maybe shifted relative tosaid stationary stop to a positionfipermitting removal. of

the thread-case fromthe loop-taker.

5. In a sewing machine, in combination, a work-support, a circularly movable looptaker sustained by said work-support, a thread-case peripherally supported by said loop-taker, a holder positioned within the.

field of actionof said loop-taker for retaining said thread-case in cooperative relation therewith, primary means for positioning the holder on the, work-support,

and means auxiliary thereto for adjusting the clearance between the thread case and holder. o a i a V 6.- In a sewing machine, in combination,

a work-support, acircularly movableloop- I taker sustained by said worlcsupport, a thread-case peripherally supported by said loop-taker, a holder positioned within the field of action of said loop-taker for re taining said thread-case in cooperative'relation therewith, primary means for positioning the holder uponthe work-support, a buffer spring carried by said holder and in engagement with said thread-case, and means auxilliary thereto for adjusing the clearance between the thread-case and buffer-spring. a

7 In a sewing machlne, 1n combination,

a circularly movable loop-taker, a thread- L case peripherally supported by said -looptaker, a holder positioned within the field of action of said loop-taker comprising relatively movable members one of which is adapted to retain the thread-case i'n' cooperative relation with the loop-taker and the other of which engages a stationary i part of the machine, and means whereby said parts may be adjusted relative to one,

anotherto vary the clearance between the thread-case and'holder;

In testimony whereof, wehave signed our names to this specification. I a

' GEORGE WOELFEL.

WILLIAM HOPF.

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