US1182017A - Stop mechanism. - Google Patents

Description

J. KIEWICZ & F. ZALESKI.

STOP MECHANISM.

APPLICATiON FILED FEB.4. 1914.

1 1 82,0 1 '7 Patented May 9, 1916.

2 SHEETS-SHEET I.

o /7 9 34 L Q n 23 49 48 (M M; {f g 8' J. KIEWICZ & F. ZALESKI.

STOP MECHANISM.

APPLICATION FILED FEB. 4. 1914.

2 SHEETS-SHEET 2.

W595, Liz/ewes,

rnn STATES PATENT JOHN KIEWIGZ, 0F HYDE PARK, AND FRANK ZALESKI, OF CAMBRIDGE, MASSACHU- SETTS, ASSIGNORS TO REEGE BUTTON HOLE MACHINE COMPANY, OF BOSTON,- MASSACHUSETTS, A CORPORATION OF MAINE.

STOP MECHANISM.

Specification of Letters Patent.

Patented May 9, 1916.

To all whom it may concern:

, Be it known that we, J oHNKmwIoz and FRANK ZALESKI, citizen of the United States of America, and subject of the Ger man Emperor, respectively, residing at Hyde Park, in Norfolk county, and at Cambridge, in the county of Middlesex, respectively, State of Massachusetts, have invented certain new and useful Improvements in Stop Mechanisms, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to stop mechanisms and more particularly to a mechanical contrivance associated with the driving mechanisms of machines of various sorts for effecting the stoppage thereof in a desirable manner.

and durable stop mechanism adapted to employment with light, fast-rotating machines such as sewing machines, power driven from a continuously rotating shaft.

Another object is to provide a stop mechanism which is easily controlled and operated and serves to promptly, yet without shock, bring the main shaft of the machine to rest preferably with the needles or other operating parts of the machine ata predetermined point in the cycle of their operations.

Other objects hereof will be perceived from the hereinafter following description of an illustrative mechanism embodying the principles of this invention. 7

To the attainment of the objects referred to the present invention consists in the novel combinations, arrangements, mechanisms, devices, details and other features illustrated or described herein.

Figure 1 is a front elevation partly in section of a portion of a machine embodying a stop mechanism constructed on the principles of this invention, the base or frame being shown in section on the plane 11 of Fig. 2. Fig. 2 is a bottom plan view of the parts shown in Fig. 1. Fig. 3 is a right elevation of the same. Fig. 1, on an enlarged scale, shows a detail. Fig. 5 is transverse section on theplane 5-5 of Fig. 1, showing the brake drum. Fig. 6 is a rear elevation of the parts in Fig. 5, the drum partly broken away. Fig. 7 is'a transverse section on the v plane 7-7 of Fig. 1, showing both the drum and brake band.

An object hereof is to afford an efiicient For convenience of illustration, the general type of sewing machine, illustrated in prior Patent No. 1,047,537 of December 17th, 1912, has been selected and. suchprior patent may be referred to for the general operation of such a machine and for various details not constituting per se the present invention.

The hollow base 9 of the machine supports the stltching mechanism, which would be at the left end of the machine and for convenience is omitted, and the driving and stop mechanism which is at the right end, partly w1th1n and partly without the base. The main shaft 10 extends from the driving mechanism to the stitching mechanism and operates the needles and coiiperating parts.

A presser-foot 11 is shown in Fig. 8 carried atrthe forward end of the arm 12 of a swinging lever the shaft 13 of which affords-a pivotal bearing and also carries a second or actuating arm 14 extending within the base 10. The arm 14 has at its extremity a stud 15 to permit the lifting of the presserfoot, against spring 16, by a lifting part or swinging arm 17, which is held down by spring 18 so that its stud 19 bears on a device or cam 20.011 main shaft 10 as shown. Thereby the presser-foot is raised automatically when the machine is stopped. When the machine is started the arm 17 is shifted to the left, so that cam 20 will not lift the presser-foot, by means later described.

The main shaft is supported in bearings, one of which, 21, is shown, and the shaft ex tends from the interior of the base through its right hand wall to the exterior parts.

Referring now more particularly to the driving and stop mechanism, it involves a brake device associated with the rotary shaft 10 or preferably with a drum constituting substantially an enlarged portion of the shaft, together with contacts or lugs upon the shaft and the brake device respectively and means for relatively adjusting the contacts endwise; namely, by bodily ad usting the en tire brake device relatively endwise so as to,

preferably comprises a brake shoe in the form of a band extending nearly around the drum, and the contact for operating the brake band is directly upon it, so that, when the brake band is shifted endwise, its contact is brought into alinement with the shaft or drum contact so that the braking force is I applied by the machines momentum to effect the stoppage. The drum contact being carried in a resiliently yielding manner prevents shock and effects the application of the braking force progressively. With the described parts is combined a power uncoupler in the nature of a belt shifter which may shift a belt to a loose pulley. A single means or control part serves in one operation for uncoupling the power and adjusting the brake device so that the lugs cooperate to bring about a prompt yet comparatively easy and shockless stoppage in which invariably the stitching mechanism or other parts of the machine will be brought to rest in a predetermined 'position or point. 7

At the right extremity of the main shaft 10 is a hand wheel 22. Near the hand wheel is a loose belt pulley 23 adjacent to a fast belt pulley 24, which, for convenience, may

be formed in one part with a drum 25 secured upon it, so as to rotate with the main shaft. A belt shifter 28 serves to couple or uncouple power from the main shaft, this bemg mounted at the end of a sliding rod 29 which i is continually pressed toward the right by spring 30, tending to normally hold the belt on the loose pulley. The spring 30 presses on a collar 31 011 the slide 29 and the collar is engaged by the lower end of a swinging arm 82 downwardly projecting from shaft 33 which, at the front of the machine, has a second arm 3&- extending horizontally to where it is provided with a handle 35 or a treadle rod 36, or both. By now depressing the treadle rod or handle the arm 32 is swung to the left and the belt shifted to the fast pulley, the release of the handle or treadle again restoring the belt to the loose pulley. Y Y 2 Associated with the main shaft, or rather with the drum25 forming a portion thereof, is a brake device idwhich may be of various construction but is preferably as hereinafter described. This brake device is shiftable endwise of the shaft between its inoperative position to the left and its operative position to the right, in which latter it effects the braking of the drum and shaft in a manner the details of which will be hereinafter explained. The brake device is bodily carried upon a slide or rod 41 supported in suitable guides or bearings. It is proposed to move the slide 41 with or by the slide 29 carrying the belt shifter and,-

although they. could be rigidly connected for this purpose, it is preferred. that the arm 32'shall actuate them both. 7 Thus a stud 42 is shown on arm 32 engaging a side recess in slide 41. By this arrangement the brake device and belt shifter may be moved to the right or to the left in unison and the belt shifter given a greater extent of 'movement than the brake device. In efiect the arm 32' and the parts which serve to move it constitute a single means for both uncou pling the power and shifting the brake device endwise into operative position, and vice versa.

The brake ClGVlCQflO is shown as comprising a brake shoe or band at?) extending nearly around the periphery of the drum 25. The drum, it will be noted, is wider than the band so as topermit endwise adjustment of the latter without disengagement of the parts.

It should be explained that in all of the figures the parts are shown in their position when the machine is stopped. 7

The brake device is provided with an extension 46 reaching around oppositely to the brake band and overlapping the latter at a point where the two are connected by a slot connection &7 permitting the'slight relative playnecessary for the tightening of the band.

The contacts or lugs may be as follows: The brake band is provided with a contact lug t8 extending laterally rightward from the band. The drum 25 is provided with an outwardly extending stop lug d9 adapted to strike the lug 48 when the lugs are in registry so asto tigaten the band for braking the drum. The drum is also provided with a check lug 50 for checking any tendency to rebound, so that, when stopped, the parts are brought quite definitely to a predetermined position.

F 5, 6, and 7 show more particularly the construction of the drum and lugs carried thereby. The drum is partitioned into two recesses by web connecting the rim of the drum to its hub 56, which latter is pinned to the shaft 10; The lug 49, which is intended to yield upon the impact in stopping the machine, is formed or mounted upon a casting in the form of a ring surrounding the hub 56. Thus permitted a limited play of the lug 49 in a slot 61 formed in the drum. The casting 60 is provided with. an arm 62 normally engaging a stop 63 formed on the partition 55. A strongly compressed coil spring 6a is located between arm 62 and a stop 65 so as to resist the yielding of the lug 49 and, toincrease the resistance a second such spring 66 is located between the lug 49 and the stop63. The check lug 50'has a slight play in a slot 70 in the drum. This lug is carried on an arm 71 capable of swinging radially and provided with a pin 7 2 determining its outward position as more clearly seen'in Fig. 5. The arm 71 is pivoted to a block 73 which extends through an aperture 74L in the partition 55 so that the check lug may receive guidance from the other side of the partition as seen in Fig. 7. Referring to Fig. 5, a spring 75 is employed to hold the check lug arm 71 in the position shown. Referring to F ig. 7, the block 73 is shown carried upon a casting 76 having a ring form and surrounding the hub 56. This arrangementv permits circumferential movement of the check lug in addition to the radial swinging movement of its arm 71. The circumferential movement is resisted by a strong spring 77 located between the block 7 3 and the stop 65. It willbe understood that the lugs 49 and 50 are in registry with each other and that the lug 48 on the brake band is out of registry with lugs 49 and 50 when the machine is running, but in registrywith them when the machine is'to be stopped. The fittings of the check lug-50 are such as to per mit its depression into the drum as the lug &8 relatively rides over it so that the lugs 48 and 4:9 may meet, the lug 5O resuming its illustrated position and serving to yieldingly check rebound. i

The operation of the machine may be asfollows: The parts are shown in stopped position. To restart the machine the arm 35 or treadle rod 36 is depressed. This swings the arm 32 to the left compressing the spring 30 and sliding the slides 29 and 41 to the left. The leftward movement of slide ll shifts the brake band device to the left, carrying the lug .48 out of registry with the lugs 49 and 50, so that the brake device is the arm 82 to the right shifting the beltv to the loose pulley and at the same time shifting the slide 41 to the right, which carries with it the brake band, moving the brake band lug 48 into registry with the lugs 49 and 50. Immediately the fast moving lug 49 on the drum strikes the brake band lug 4:8, two things occur. The impact serves to tighten the brake band for slowing down the drum. At-the same time the momentum carries the drum farther, with the result of compressing the springs 6i and 66 which, as they are compressed, serve to increase the pressure of lug 49 on lug 48 so as to progressively increase the braking force of the band upon the drum. In this way the momentum of the parts is utilized to efiect their own stoppage with a progressive braking action and accompanied by a yielding whichavoids shock. The stoppage is peculiarly easy, efiective and prompt. As soon as the parts have come to rest the springs 6%, 66 reassert themselves to the slight extent necessary to restore the parts to the position shown. These reverse movements are practically insignificant. To prevent any excessive reverse movement or rebound, the check lug 50 comes into play. This lug had been depressed into the drum by the lug -18 in the act of stopping but it immediately springs out to the positions shown in Figs. 5 and 6, so that the lug i8 is confined between the lugs 49 and 50 and improper movements prevented as desired. In connection with the stopping and starting operations described, a certain control of a presser-foct is attainable when the invention is applied on a sewing machine. Thus the hub 80 of the swinging presser- .foot lifting arm 17'is mounted at the inner end of the slide 4:1 which carries the brake device 40. A slotted connection 81 is shown permitting the arm to swing yet compelling it to move endwise with the slide. In the adjustment shown the arm 17 has its stud 19 in operative position so that the cam 20 has lifted the presser-foot with the "stoppage of the machine. When the machine is restarted by moving the slides 29 and ll to the left, the hub 80 and arm 17 are also moved to the left thus carrying the stud 19 to inoperative position whereby the lifting cam -20 has no efiect upon it during the running of the machine. It will thus be seen that a single means has been provided for uncoupling the power, applying the braking device and causing the automatic lifting of the presser-foot upon the stoppage of the machine, and in restarting restoring all of these parts to their previous position.

It will thus be seen that there has been de scribed a stop mechanism embodying the features and attaining the objects and advantages referred to and further advantages will be apparent to those skilled in the art. Since many matters of arrangement, design, detail and other features may be varied without departing from the principles hereof, no limitation to such features intended excepting so far as specified in 'the appended claims.

What is claimed is:

1. In combination, a rotary shaft having a drum portion, a brake device adjacent said drum comprising a shoe and an impact stop lug on the shoe, a stop lug carried by the drum, means for adjusting said device.

endwise of the shaft to bring the lugs into or out of registry, and a check lug carried by and projecting from the rotary drum in alinement with the stop lug and capable of depression into the drum interior by the shoe lug riding over it.

by and projecting from the rotary drum in alinement With the stop lug and capable of depression into the drum interior by the shoe lug riding over it and of yielding upon a rebound of the drum.

3. In combination a rotar shaft havin a drum portion, a brake device adjacent said drum comprising a shoe and an impact stop lug on the shoe, a stop lug carried by the drum, a loose belt pulley adjacent the drum and a single means for shifting a belt from and to the drum to and from the loose pulr ley, and for adjusting said device endwise of the shaft to bring the lugs into or out of registry, whereby the shaft will be slowed by said brake band and positively stopped by said lugs.

4:. In combination, a rotary shaft carrying a drum and an impact stop lug, a brake device comprising a. shoe and an operating lug which also serves as an impact stop lug, a slide substantially parallel to said shaft carrying the brake device, and means for shifting the slide to bring the lugs into registry, whereby the shaft applies its own brake and said lugs give a positive final stop.

5. In combination, a rotary shaft carrying a drum and an impact stop lug, a brake device comprising a shoe and an operating lug which also serves as an impact stop lug, a slide substantially parallel to said shaft carrying the brake device, a power uncoupler, and a single means for operating said uncoupler and for shifting the slide to bring the lugs into registry, whereby the shaft applies its own brake and said lugs give a positive final stop.

In testimony whereof we afiix our signatures in presence of two witnesses. l JOHN KIEWVICZ.

FRANK ZALESKI. Witnesses: r

F A. SHEA, A. P. SGHOENKY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. V i

Images