US2131005A

US2131005A - Tension device for sewing machines

Info

Publication number: US2131005A
Application number: US75524A
Authority: US
Inventors: Daniel H Chason
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1936-04-21
Filing date: 1936-04-21
Publication date: 1938-09-20
Anticipated expiration: 1955-09-20

Description

Sept. 20, 1938. D. H. CHASON TENSION DEVICE FOR SEWING MACHINES Filed April 21, 1936 \II. fijl "a 35 adjusting nut. well known multiple spiral screw threads, in the 35 Patented Sept. 20, 1938 g 2,131,005

UNITED STATES PATENT OFFICE TENSION DEVICE FOR SEWING MACHINES Daniel H. Chason, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application April 21, 1936, Serial No. 75,524

6 Claims. (01. 242-450) This invention relates to sewing machines and and inclined tongue 24, the purpose of which will more particularly to an improved device for tenbe hereinafter described. sioning the needle-thread. Seated against one of the shoulders of the en- One of the objects of this invention is to prolarged portion 25 of the arbor I3 is the usual ten 5 vide an improved means for adjusting the initial sion disk 26 and adjacent the disk 26 is a second 5 tension on the spring so as to meet the minimum tension disk 21, both disks being provided with a requirement. Another object of the invention is central aperture which receives the arbor I3, said to provide improved means for adjusting the inidisks having their peripheral portions bent in optial tension on the check-spring. posite directions so as to form a peripheral groove Another object of the invention is to provide to receive the needle-thread. Abutting the disks 10 a threading device which facilitates the placing of 25 and 21 is a guard-plate 28 having a forwardly the thread between the tension-disks. extending portion 29 which enters an aperture in With the above and other objects in view, as the head of the machine (Fig. 3). Bearing will hereinafter appear, the invention comprises a nst t e u d-p a 2B is the pp the devices, combinations, and arrangements of member 30 having a centrally located raised porparts hereinafter set forth and illustrated in the tion 3| and a diameter bar 32 passing through accompanying drawing of a preferred embodithe slot 33 in the arbor I3. The usual beehive ment of the invention, from which the several pr g 34 encircles the arbor and its base bears features of the invention and the advantages atagainst the cup-shaped member 30 and its other tained thereby will be readily understood by those nd engages an anchor disk 35 formed with an 20 skilled in the art, upstanding stop-lug 36 and a diameter bar 31 of Figure 1 is a side elevation of a portion of a less width than the width of the slot 33 in the sewing machine bracket-arm' provided with a arbor. tension device embodying my invention. Mounted on the arbor I3 and in telescopic rela- 5 Figure 2 is a side elevation of my improved tion with the member 30 is a second cup-shaped tension device, a portion of the bracket-arm bemember 38 haVing indieie On its Outer P p y ing shown in section. which cooperate with the pointer 39 on the mem- Figure 3 is a longitudinal vertical section ber to indicate the degree of tension on the through the tension device. thread. The member 38 is formed with a plurality 30 Figure 4 is a disassembled perspective view of of apertures 40 in its base portion and a lug 4| 30 the device. which cooperates with the stop-lug 36 on the Figure 5 is a sectional View taken along the line anchor disk to limit the movement of the mem- 5-5 of Figure 2. ber 38 to one complete rotation.

Figure 6 is a longitudinal section through the The free end of the arbor I3 is formed with the Th holl w-head In of the usual bracket-arm present instance sextuple threads, and the adis formed with a recess II and an aperture I2 lusting nut 42 is correspondingly tapped in order which receives the hollow cylindrical arbor I3 of o ece ve t e of the AS Shown in the tension device, the shank being adjustably 6, the lead of the threads is equal to the distance held in position by the set-screw I4 (Fig. 2). P. and th re r ne c mpl t ro ti n of the 40 Coiled about the arbor I3 is the usual torsion dju n nut 42 mOVeS the nut longitudinally of check-spring I5, the end I6 (Fig. 3) of which i the arbor I3 a distance equal to the lead of the anchored in one of the eight slots II' formed in thr eads- This construction permits a beehive the periphery of the enlarged portion 25 of the spring of the usual strength and stiffness to be arbor l3. The other end I8 of the torsion checkused g 2 3 2 device in the adjust- 45 ing nu is imi e 0 one comple e rotation. zgig f fiig z f i gz i g jgg rg 422 in the presint instance the nut 42 is provided wi h a stud 3 which is adapted to enter one of F checkfsprfng 1S hmlted m Its of the apertures 40 in the member 38. This conmovement m one dlrectlon by the stop'lug struction causes the member 38 to rotate with 50 formed on the plate 20 which is adjustably sethe nut 42 and permits adjustment so that the cured to the head of the machine by the screw 2| tm t i n on the beehive spring 34 may be and slot 22. obtained.

The plate 20 is also formed with a backwardly Disposed in a longitudinal aperture in the arbor extending portion 23 and a forwardly extending I3 for endwise movement is a tension-release pin 55 45, one end of which is adapted to engage the diameter bar 32 of the member 3|] and push the latter in a direction to relieve the

tension disks

26 and 21 of the pressure of the spring 34. The pin 45 is moved longitudinally of the arbor by the bar 46 which is actuated by the usual presser-foot lifting lever.

It will be evident from the foregoing that the pressure between the

disks

26 and 21 may be adjusted by rotating the nut 42 together with the member 38 on the arbor l3, and this movement will cause the nut 42 and member 38 to move the distance of the lead of the threads longitudinal of the arbor for each complete rotation of the nut 42. It will be understood that the lug 4| on the member 38 engages the stop 36 of the anchor disk 35 to limit the movement of the nut 42 to one rotation. The diameter-bar 31 having a width less than the width of the slot 33 in the arbor, the nut 42 may be turned one complete rotation. The tongue 24 on the guard-plate 20 extends over the edge of the tension disk 26 and terminates intermediate the outer peripheral edges of the

tension disks

26 and 21. The purpose of this construction is to facilitate the placing of the needle-thread between the tension disks. The threading is accomplished by placing the thread on the outer surface of the tongue 24 and then pulling the thread in such a manner as to cause it 'to slide down the inclined surface and finally slip over the end of the tongue and between the

tension disks

26 and 21.

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

1. A tension device for sewing machines com prising, an arbor, a pair of tension disks carried by said arbor, two cup-shaped members mounted on said arbor and having telescopic cylindrical flanges, one of said cup-shaped members having a series of apertures in its base portion, and an adjusting nut carried by said arbor and having a pin which is adapted to enter a selected aperture in said last-mentioned cup-shaped member.

2. A graduated tension device for sewing machines having, a longitudinally slotted supporting arbor, a pair of tension disks, a pair of telescopically arranged tubular members surrounding said arbor, one of said members being provided with a series of apertures, a spring between said members, an adjusting nut carried by said arbor and having means adapted to enter a selected aperture whereby the nut and member are locked together for rotation, and means for limiting said nut and member to one complete rotation.

3. A graduated tension device for sewing machines comprising a supporting arbor formed with a series of longitudinal slots, a check-spring coiled about said arbor and having one of its ends anchored in one of said slots and its other end extending outwardly from thearbor in a position to engage the needle-thread, a pair of tension disks carried by said arbor, telescopic cup-shaped members carried by said arbor and enclosing a compression type spring, one of said members having an indicator and the other of said members being provided With suitable indicia which cooperate with said indicator, an adjusting nut carried by said arbor and means for limiting said nut and one of said cup-shaped members to one complete rotation.

4. A graduated tension device for sewing machines, comprising a supporting arbor, tension disks carried by said arbor and having their outer peripheral portions bent in opposite directions, and a plate having a portion which embraces the arbor, said plate being formed with a tongue having a greater length than the distance between the outer peripheral portions of the disks and which is inclined towards and extends over the edge of one of the disks and terminates intermediate the outer peripheral edges of the disks for directing a thread between the disks.

5. A tension device for sewing machines, comprising a supporting arbor, tension disks carried by said arbor and having their outer peripheral portions bent in opposite direction to form a peripheral groove, and a plate formed with a backwardly extending portion which carries a forwardly extending tongue which terminates in-f termediate the outer peripheral portions of the disks for guiding thread into the groove between said disks, said forwardly extending tongue being inclined towards said disks. 7

6. A graduated tension device for sewing machines, comprising a supporting arbor, tension disks carried by said arbor and having their outer peripheral portions bent in opposite directions to form a peripheral groove, and a plate formed with a tongue which is inclined towards said disks and terminates intermediate the outer peripheral portions of the disks for directing a thread into the groove. I a a DANIEL H. CHASON.