US875610A - Thread-controlling mechanism for sewing-machines. - Google Patents

Description

No. 875,610. PATENTED DEC. a1, 1907.

w. N. PARKES.

THREAD CONTROLLING MECHANISM FOR SEWING MACHINES. APPLICATION FILED MAR.26.1903.

54 INVENTOR: numb? flaw/4.

M ATTORNE Y 40 UNITED STATES PATENT onrron WILLIAM N. PARKES, OF BROOKLYN, NEW YORK.

TIiREAD-CONTROLLING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 31, 1907. I

Application filed March 26. 1903. Serial No. 149 ,661.

' New York, have invented a new'and useful Improvement in Thrcad-Controlling 1\Iech anism forSewing-Machines, of which the following is a description- This invention relates to the thread ten sion and slack thread controlling mechanism. for sewing machines.

One of its main objects is to provide a simple compact thread tension and controlling mechanism, that may be readily adjusted to change the tension on the thread, the extent of the movement of the controlling device and the tension of the same.

' It is also an objectto adapt all of said mechanism to be mounted on a single carrying stem which maybe readily secured in any suitable lace'in the machine.

With the above and other objects in view, my invention consists of the arts and combination of parts as described in the specification, and specifically set forth in the claims.

In the drawings: Figure 1 is an end elevation of the head of the sewing-machine, the face-plate being removed, showing the loca tion and disposition of my invention rela tively to the other essential elements of a stitch-forming organization; Fig. 2 is a vertical sectional view of my threadcontrolling mechanism, including that portion of the machine head upon which the same is sup ported; Fig. 3 is an elevation of the controller spring. Fig. 4 is a vertical sectional view, similar to Fig. 2, showing another form of my invention; Fig. 5 is a vertical section taken on the line 5-5 of Fig. 4, the

s )rin bein omitted. showin the means b C A I" which the spring-housing may be adjusted; Fig. 6 1s a vertical sectional view, sim lar to Fig. 2, showing a third form of my invention Fig. 7is a section on the line 7 of Fig. 6,

the spring beingomitted; and Fig. 8 is a vertical sectional view of the thread-controlling device shown in Fig. 2, the parts" being separated but shown in their as'sem-.

bl ing relation.

The numeral 1, indicates-the head of the machine; 2, the. resser-bar; 3, the resserfoot; 4, the nee ebar; 5. the need e; 6, a

vibratinggate in which .the needle may reciprocate;-7, adjustable bearings for said needle-gate; 8, the resser-foot hfter; 9, the pressure-springfor saidresser-bar; 1D, the

driving-disk on the end of the main shaft; 1], an actuator carried by the crank-pin on said disk; 12, a vibrating lever driven by the actuator and suitably connected by a link 13, to the needle-bar4; 14, the take-up operatively connected to the actuator 11; and 15, the. guide-rolls and fulcrum device for said take-up. All these- "arts may be of usual construction, or may e substantially the same as the mechanism shown and described in my application filed March 6, 190$,Serial No. 146,468.

I The thread-controlling mechanism is suitablysupported, as shown inthe severalfigures, on the head of the machine, in the line of the lead of the'thread between the needle and the take-up. As shown, the frame is provided with a projection or boss. 17 thou h this is not necessary,in which is suita ly supported the pin or stem 18, of the tension device, the same being smooth at its inner end and grooved at 19, for the receptionof a binding screw 19 passing through the frame, in Fig. 1. Next to the grooved portion, is 'an enlarged screw-threaded portion 20, providing a shoulder 21, which limits the extent to which the stem 18', may be screwed into the frame. Next to the screw threaded portion 20, is a still larger smooth portion 22,'providing a shoulder 23, for the purpose of holdin the housing or bushing '30, hereinafter descri ed, on the stem. Next to the smooth portion 22, the stem is reduced and, at its outer end, is provided with a transverse'saw-cut 24, and is also externally screw-threaded at 25.

26, is a cylindrical, tubular collar, having a transverse scrcw threade'd bore 27, for teh reception'of a short screw 28. The collar 26, 1s also provided with a short prO ecting pin 29, extending from its face parallel with the stem 18. Pin 29, determines the normal position of the slack-thread take-up, herematter described. 30, is a cup shaped housing, having through its closed end a screw-threaded bore 31, and a smooth bored aperture 32. In its periphery the housing 30, is provided with a circumferential groove 33, designed for the reception of the end of the screw 28, by

place on thehousing. Said screw 28. also acts as an adjusting medium byv which the slack-thread take-up may be held adjusted with reference to the tension necessary to be applied to the needle-thread. The thread controller spring consists of a sprin wire coiled so asto provide a cylindrica body portion. 35, having a looped ex tending part 34, the end 36 of which is ada iph ed to be engaged directly by the thread. he

said controller spring at one endterminates,

into a supporting coiled portion 37, and at its other end into ashort strai ht end. 38, that extends at right angles to t e .body boiled ortion' of t e spring. A washer 39 is coated on the stem 18 next to the hub 22,

and next to said washer are thread'tension disks 40. -On the stem next to said tensiondisks is a disk 42 proszided with a hub 41, the

'latter being intermediate one of the tension disks 40 andsaid' disk 42. Next'to the disk 42 1s a thread tension spring 43, anut 44 being provided to regulate the pressure of the spring on the'disk 42, and through it the-tension of the'disks 40 on the thread, it being understood that all of these disks are free to -move on the smooth portion of'the stem 18,

where they are located? When all these parts described are assembled, the-body portion 35, of the controller spring surroundsthe stem 18 within the housing of the cup shaped part 30, and the end 38 of said spring extends into the aperture 32, thereby preventing the said end from turning relative to said housing. The body portion of the controller spring is located between the collar 39, and t ebottom of the housing 30, and the said body portion is retained within the housing, and the end 38 in the aperture 32 by said collar. It is thus seen that the body portion of the controller spring is located on the en larged portion or hub 22 of the stem .18. The tension disks 40 are located intermediate the limbs of. the looped portion of the controller spring, and the coiled end portion 37 of said spring is located on the hub 41 of the dislk 42, and is ada ted to turn freely on said im of said spring restson the extenc ing pin 29. It is thus seen that by the circumferential adjustment of the collar 26, that carries the spring 29, the tension of the extending portion 36 of the controller spring may be increased or decreased. And that by the cir' cular adjustment 01 the stem 18' the working vention it" will One of the limbs of the looped portion iting pin 29, is connected by means of the screw 28, to a reduced portion 47, of the' frame 1.

The stem 18, is screw-threaded at its inner end 19, and is screwed into an ap- I erture in the frame. In other respects the thread-controlling mechanism, in this form of m invention, is substantially the same as the orm portrayed by Figs. 2 and Adjustment of the slack thread take-up, 1n this formof m invention, is obtained by loosening the s m 18, in th'e'frame', 'to free the" housing 30,-- then the housing 'is-turnedby the'handle 45, until the proper degree of tension is fobtained,-the stem 34, of'loop 36, being in contact with pin 29,When the stem 18, is screwed into the frame 'toset the housing. The pin 29 inthis form of myrin observed that the housing 30'gvis adjusted circumferentially to increase or decrease the efnoted-,'is in the collar 26,: as in the first described form, but it will be tension of the thread engaging part 36 of the v controller spring. The function of thesaid collar in this-form isthe adjustment of the limiting pin, which it carries, about the axis of the stem 18, and thereby the working position of the'said part 36, while in the other form the function of this collar is to increase the tension of the controller spring on the thread; In this second form of my invention the tension of the said controller spring maybe adjusted without chan ing the location of the pin 29, or without isturbing the collar 26xthat carries said pin at all, while in the first form the adjustment of the collar to change the tension of the spring changes the location ofsaid pin 29, and then the stem 18 1 must be adjusted to again locate saidpin in its previous position, so that the Working position of the end 36 of the controller spring will be properly located.

In Figs. 6 and 7 isshown a third form of my invention; In this form a housing 48 has a bore formed in its end which serves as a cup shaped housing for the body portion of the controller spring, as does the housing 30,

but this housing 48 is different from the housing 30, as will .be seen. housing has a smooth bore centrally through its bottom for the passage of the stem 18,

which latter is screw threaded at 19', and is The bottom of said held thereby in a threaded bore in the frame I of the machine. The shoulder 23, of the enlarged portion 22, of the stem 18, bears directly upon the inside of the bottom of the housing 48, thereby binding the same be tween the frame 1 and said shoulder 23. A bushing 49, is located in the cup of the housing 48, which is provided at its inner end with a web 50, having an aperture therein for the reception of the end 38, of the thread controller spring. on its periphery witha circumferential Said bushing is also provided A groove 51, and with'worm teeth or threads 52', which latter are engaged by a worm screw 53, located in a smooth bore formed.

in an enlarged portion of the housing 48. The worm screw extends tangentially to the periphery of the bushing 49, and at its outer end is provided with a screw cut or slot by means of which it may beturned b a small screw driver. Said screw is fprovi ed at its inner end with a smooth reduced portion 54, which fits freely in a smooth bore in the housing as shown'in Fig. 7 The limiting pin 29 in this third form of my invention is carried by the housing 418-, the body portion of the controller spring is located within the bushing 49 and the end 38 of said spring is located in the aperture in the web 50 of said bushing. In this form'of my inventionthe strain of the controller spring, it will be observed, by the connection between its end 38 and the bushing 49 is such, that causes it to tend to turn said bushing in a direction'that pushes the worm screw 53 in its bore and thereby keeps the reduced portion 54 of said screw in its bearing. It will thus be understood that the tension of the controller spriiig is utilized to keep the regulating screw 53 in its bore or housing, and this tension is always strong enough to perform this function, and also to keep the said screw from turning.

It will be evident from the fore oing that in the third form of my invention t e tension or the controller spring may be regulated 7 without disturbing any of the other elements of the mechanism. .By turnin the screw '53 the bushing 49 is turned, an( as theend 38 of the controller spring is located in an aperture in the said bushing it is evident that by this means the tension of the controller spring may be increased or decreased. If it is desired to change the workingposition of the extending end 36 of the controller, in

, this formof my invention, the carrying stein is unscrewed from its seat in the frame surfi- -ciently for the housing 48 to be adjusted around the desired extent on said stem, when the sald houslng 18 again secured in position by the said stem as efore.

' It isto be noted that the thread controller spring, and the thread tension device are .the

same in all of the three forms of my inven tion as described, and also .that the hub or support 41 on the disk 42 serves as a support for the end 37, of the thread engaging part of the controller in all three of said forms. And itis also to be noted that the difference in the forms illustrated lie in the different means, or modifications of the adjustments of the tension ofthe controller spring and the working ositi on of the thread engaging part 36 oft 1e controller. In sewing machines it is desirable to adjust these parts for different kinds of work, especially if the machineis to be rune.- a very high rate of speed. For exampleit is desirable that the action of this controller spring. should reach the limiting pin just previous, or at the time the needle under reaches the work, so of course if very thin material is being stitched it is advantageous to adjust the action of the controller differ-- ently from the adjustment it is under when very heavy material is being stitched as the needle reaches'the work earlier when heavy material is. being stitched than when light material is being stitched as is well known.

And for various kinds of special work, and in the use of different kinds and sizes of thread it is desirable to have these parts difi'erent adjustments, hence the reason for making these parts so they can be readily adjusted. It is important in these controller springs, when the machine is to be run at a very high rate of speed, that there should be as much life as possible in the thread engaging part of the spring, to the end that it will act as quickly'as possible. The manner in which my controller spring is carried and supported is to be noted, the end 37 being mounted to turn freely. on the hub 4.1, and. the body coiled portion 35 being advantageously housed, and allof said spring being well balanced adds to its efficiency; The compactness of mounting all the tension device, the slack thread controller device, and the means iorregulating' these elements on asingle supporting stem is to be noted.

, It will be evident that other modifications than those shown may be made in my invention without departing from the spirit of the same, therefore it is to be understood that I do not wish to be limited to the exact forms herein described.

Having thus-described my invention what I claim and desire to secure by Letters Patcut is:' I j 1. A thread controlling mechanism for sewing machines comprising asupporting stem, a housing surrounding said stem and held adjustably fixed thereby, a art carried in said housing, means for circu arly adjusting said part relative to the housing, a controller spring the coiled body of which is located in said part, and an extending'end of-the same in engagement with said part, said controller spring provided with a thread enga ing art, and a support provided forsaid t rea engaging part.

2. A thread-controlling mechanism for sewing machines comprising'a supporting ste'm, a controller spring, means'forsupporting said controller spring and for regulatingthe'stress of the same on. the-thread comprising two parts one of which is'supported by the other, and a worm connection between said darts by means of whichthe stress of the controller spring is regulated.

ing machines comprising a supporting stem,

a housin surrounding said stem and adjust ably hel fixed thereto, a bushing located in said housing, a worm connection between the V,

3. A thread controller mechanism for sewv housing and the bushing by means of which the bushing may be circularly adjusted relative tothe housing, a controller springhaw.

ing a coiled body ortion located in said bushing, said contro er spring provided. with a-thread engaging part,and a connection between the spring and the bushing.

4. A slack-thread controller, comprising a spring or coiled Wire having athread engagmg extension, a stem supporting the same, means for adjusting the tension of the controller to regulate its stress upon the thread including a bushing, by which the coiled portion is housed and to whiclrthe controller is connected, supported by said' stem, andmeans for adjusting the bushing-circumferentiall'y of the stem.

ing machines, comprising a supporting stem,

5. A thread-controlling mechanism for sewa collar surrounding said stern and held fixed thereby, a bushing lnclosed by the collar and surrounding said stem, means for adjusting the bushing relatively to the collar, a slackthread controller conne'ctedto the bushing at one end and supported by the: stem at the other end, .a tension device supported by said stem, and means for regulating the stress of the tension device on the thread.

6. A thread-controlling mechanism comprising a supporting stem, a collar supported thereby, a bushing also supported thereby within the collar, a spring surrounding said stem within the bushing and connected to the latter, said spring having a thread-engaging arm, a tension device carried by the stem having a portion embraced by said arm, and

independent means carried by said stem for adjusting said arm and tension device Whereby to regulate the stress of each upon the thread.

ing machines co'm rising a supporting stem, a ousmg carried y said stem, a controller spring having a coiled body portion that is located in said housing, a tenslon device supported by said stem, the controller spring provided with a thread engaging part that is ooped over the tension disks of said tension device, an auxiliary disk having a hub on which the end of the outer limb of said looped portion is mounted, said hub in engagement -',with the thread tension disks,

, 40 7. A thread controlling mechanism for sew-'

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