US541570A

US541570A - Sewing-machine

Info

Publication number: US541570A
Authority: US
Publication date: 1895-06-25
Anticipated expiration: 1912-06-25

Description

(No Model.) 3 Sheet-,s-Sheei:l 1.

H C PETERS SEWING MACHINE.

.Patented June 25, 1895.

.mrlege' Y 1 fren (No Model.) v 3 Sheets-Sheet 2. H. C. PETERS.

SEWING MACHINE. I No. 541,570. Patented June 25, 1895.

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recom-nonsens Mi eases H. C. PETERS.

SEWING MAGHINB.

3 Sheets-Sheet 3.

(N o Model.)

No. 541,570. Patented June 25, 1895.

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NTTED STATES PATENT OFFICE.

HEBER C. PETERS, OF BOSTON, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 541,570, dated J une 25, 1895. Application tiled January 23, 1895: Serial No. 535,871. A(ll'o model.)

T all whom, it may concern:

Be it known that I, HEBER C. PETERS, a citizen ot' the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specication, reference being had therein to the accompanying drawings.

My invention relates to sewing machines which are used for sewing leather, and more particularly to the devices which are employed in such machines for actuating the cast-oft and thread-guide, and also to the construction of the thread guide. v

The invention will be fully described first in connection with the accompanying drawings, after which the respective features thereof will be more particularly pointed out and clearly defined in the claims at the close ofy this specification. l

In the drawings, Figure 1 is a view in side elevation of a sewing-machine having my invention applied thereto.

Fig. 2 is a view of the said sewing-machine in end elevation, the

view being taken from the right h-and in Fig.-

1. Figs. 3, 4, and 5 are detail-views showing certain features of the operating mechan- Iism. Figs. 6 and 7 show a modification.

1 is the frame-work of the machine.

2 is the work-supporting post, it having the throat-plate 3 mounted thereon at its' upper end.

4 is the driving shaft, shown as provided with a band pulley 5. Any suitable and desired driving arrangements may be employed.

6 is the needle, 7 is the'needle-bar, and 8 is the needle-post, the said needle-post having guides in which the needle-bar moves u p and down as usual. The said needle-post is afxed to the projecting front end of the rocker-shaft 9.

10 is a pivot connecting to the needle-bar 7 the upper end of the link 11, the lower end of said link being connected by the pivot l2 to the arm.13 of the rocker-shaft 14.

is the cast-'oftfand 1 6 is the cast-oft bar, the said bar moving up and down in guides in the needle-post 8.

17 is the awl, and 18 is the awl-bar, the said aWl-bar moving up and down in guides in the head 19, as usual, and being actuated by means of the arm 20 on the rocker-shaft 2l.

22 is the presser-foot, and'23 is the presserbar, the latter being mounted in guides in the said head 19.

All of the foregoing parts are or maybe of usual character and construction.

1 24 is a disk or plate mounted upon the inner end of the driving shat't 4, and carrying a compound or double crank pin 25 substantially such as is presented in United States Letters Patent No. 530,471. See Figs. 1 and 3. The main portion of the said crank-pin has applied thereto the eye 26 at the lower end of the connecting-rod 27, the latter having at its upper end a pivotal connection at 28With the arm 29 ot' the rocker-shaft 21. Through these devices and connections the awl-bar rocker-shaft 2l is operated.

30is the offset portion of the crank-pin, from which the needle-bar rocker-shaft 14 is actuated. The said off-set portion 30 receives upon it the eye 3l, at the upper end of the connecting rod 32, which latter has at its lower end an eye 33 that is fitted to the pivotal bolt 34 servingy to connect it with the arm-35 on the needle-bar rocker-shaftlet.' The bolt 34 is set in a slot 36 which isformed in the arm 35, and is secured in the desired position lengthwise of the said slot by means of the nut 37. The adjustment of the bolt 34 along the slot 36 varies the length of the stroke which is transmitted through the arm 35, rocker-shaft 14, arni 13,-and link 11, to the needle-bar 7 and needle 6.Y The slot 36 is curved, and when the arm 35 has been raised into its highest position the said slot36 corresponds with the arc ot' a circle that is concentric with the portion 30 of the compound or double crank 25. As a result of this arrangement of the slot with reference to the portion 30 ot` the double or compound crank, the adjustment ofthe bolt 34 along the slot 36 has no eect in varying the point which is reached in each rise of the needle, the highest point of the movement' of the needle being the same for all adjustments. The latter have merely the effect of varying the extent to Which the needle is depressed.

38 (see more particularly Fig. 4) is a cam fixed upon the shaft 4.

39 is a bar in engagement with the said cam and having one end thereof connected by a bolt 40 with an arm 41 on the cast-otf'rockershaft 42.

43 is a second arm on the said rocker-shaft, it having connected to it by pivotal screw 44 the upper end of the link 45, which latter has its lower end connected by the pivotal, screw 4G with the block 47, the said block being made fast to the castoff bar 16,-by means. of the screw 48, or in other suitable manner.

The foregoing devices serve for the actuation of the cast-off bar and cast-oft'.

49 is a slot in the arm 41, along which the pivotal bolt 40 may beadjusted, in order to vary the length of the stroke that is comin-unicated to the cast-olf bar and cast-off. TheA the opposite ends of the arc381, as centers.

A change in the length of stroke of the needle-bar and needle should be accompaniedin most cases, particularly if such change alters the stroke to any desirable extent, by a corresponding change in the stroke of the castolf bar and cast-off. The slot 4.9 enables the stroke of the cast-off bar and cast-off to be,

changed. w l

I have found by practical. experience that the best results are secured il", when the stroke,

of the needle bar is varied,.and. in addition to correspondingly Varying the length of the stroke of the cast-off bara variation be occasioned in the timing ot the stroke. of the cast-olf bar and cast-off relatively to that ot'. L the needle-bar and needle, by beginning the.

downstroke of the cast-ott at an earlier instant in the down-stroke of the needle.

It is evident that after a change in the length of stroke in the needlebar and needle,

such downward movement must be begun and` completed within the same timelimits asbefore the change was made. From this it re-` sults that the needle-bar and needle are compelled to travel much more rapidly while making a long stroke than while makinga short one.`

Asis well understood by those familiar with machines of theY classwhich includes that illustrated in` the drawings, the downward movement of the cast-o does not begin until after a part of the downwardk movement of` the needle has been made, the cast-0E then starting and accompanying the needle while thellatter continues to descend. If the machine is so constructed and adjusted that, when the needle-bar and needle are working with a short stroke, the` cast olf will begin to descend at practically the same rate of speed as that at which the needle is moving, we shall find, after making an increase in the length of stroke of the needle, that the needle will descend more rapidly than the cast-olf, when the latter begins its down-stroke. In consequence, there will be a considerable change of relative position between the two, which is undesirable, inasmuch as it tends to Y cause the thread to be crowdedinto the hook of the needle and pinched therein.

I remedy the foregoing defects and disadvantages by mounting the arm 4l on the rocker-shaft 42, in a downwardly inclined pol sition, as shown, and I employ the construction of bar 39 and cam 38 above described. When, now, the bo1t40is adjusted outwardly I along the arm 41,`in lengthening the stroke of the cast-olf, it occasions, as will be apparent, t an angular adjustment of the bar 39 with reff erence tothe shaft 4-that is to say, in inaknling this adjustment of the bolt 40 outwardly .l along the arm 41 of the rockenshaft 42, the

vvbar 39 is swung through a small number of .j degrees around the shaft 4. The direction of `rotation of the shaft 4 is as represented by 1` the` arrow in Fig. 4. lt results from this that the downward movement occasioned by the t portion` 384 of the cam 38 begins at an earlier w moment in the order of the movement of the parts of the mechanism. In` other words, the angular adjustment of the bar 39, quickens, as. it is termed, the action of the cam 38 in the timing of the parts. In consequence ot' being started earlier with` relation to the timl ing of the descending movement of the needle, the movement of the cast off already has become somewhat accelerated by the time `that the hook of the needle has descended to vthe point of the cast-off,` and hence the two continue to descend more nearly in perfect unison than otherwise would be possible.

50 is another cam mounted to the shaft 4 and rotating within an opening or yokein the arm 5l. From the said arm 51, the needle- 4 post rocker-shaft 9 is actuated. For this purpose, I make` use, by preference of the mechl anism which is presented in Letters Patent of the United States No. 507,786, to which reference may behad. The upper end of the arm 51, see` Figs. 1 and 5, carries a pivotal screw 52, 1 'which receives the eye 53 of the link 54. The other end of the said link has an eye 55 titting the pivotal bolt 56 which is set in the slot 57 of the arm 58, the latter being sleeved upon thethreadfguide rocker-shaft 59.` The said4 thread-guide-rocker shaft 59 is mounted in bearings at 60, 61 in which it is arranged t to rock and to slide endwise. Adjustment ot' 1 the bolt 56 in the slot 57 enables the length of the movement transmitted to rocker-shaft 59 to be varied. The end of the rocker-shaft l 591 which receives the arm 58 has, formed 9 therein a groove or grooves 62, into which is @received a key or keys 63 to cause the arm and rocker-shaft to turn in unison while perl mitting the rocker-shaft to move lengthwise ITO ' rocker-

shaft

59, and 68 is a spiral spring surrounding the said rocker-shaft and located between the collar 66 and the part of the Inachine which contains the bearing 6l. The spring and cam act in opposition to each other in producing the longitudinal movements of the rocker-shaft 59.

The forward end of the rocker-shaft 59 is bored transversely to receive the cylindrical pin 69, which latter is held therein by the clamping screw 70. The block 7l applied to the pin 69 is bored at right angles to the bore of the rocker-shaft, and receives the cylindrical stem of the thread-guide 72, which is held in place by the clamping screw 73. The pin 69 may be adjusted in the direction of its length relatively to the rocker-shaft, and may be turned on its longitudinal axis. In like manner, the thread-guidevmay be adjusted longitudinally7 in the block 7l, and may be rocked upon its axis.

A modified means of connecting the arm 58 and the rocker-shaft 59 so as to compel them to turn in unison about the axis of the said rocker shaft but with capacity for permitting movement of the said rocker-shaft in the direction of its length is shown in Figs. 6 and 7. In these iigures, the outer end of the rockershaft is squared off and to the same is tted a bushing 74. This bushing is slotted lengthwise thereof from the periphery to and beyond the center. A gib fitted to the said slots iills that portion thereof which is not occupied by the squared portion of the shaft. This gib is somewhat longer than the distance from the outer side of one of the ears '76 to the outer side of the other of said ears 76, and the 11p-turned ends 751, 751, of the said gib 75 are at the outer side of the said

ears

76, 76. Thereby the gib is prevented from moving endwise with the shaft as the latter reciprocates. The hub or sleeve of the arm 58 is fitted to the exterior of the bushing 74 between the ears 76, which also in the case of the construction which is represented in Figs. l and 5, hold the said arm from movement in the direction of the length of the rocker-shaft 59. Through the side of the sleeve or hub of the arm 58 extends a screw 77, the inner end of which'takes against the bushing 74, and locks the two together so that the bushing and arm must turn as one. A second screw 7 8 also extends through the sleeve or hub of the arm 58 and'takes against the gib 7 5. This latter screw enables the gib to be forced Ainto intimate contact with the adjacent surface of the squared portion of the rocker-shaft 59 and also ing up wear.

I claim as my inventionl. The combination with the needle-bar,

provides for takmeans for actuating the same, means for adjusting the length of stroke of the needle-bar, the cast-off, its rocker-shaft, and operating connectionsintermediate thesaid cast-off and rocker-shaft, ofl actuating means for the rockl er-shaft, and adjusting means to increase the throw of the rocker-shaftrand quicken the timing of the cast-olii', substantially as described.

n 2. The combination with the cast-off, its

rocker-shaft, and operating connections intermediate the said parts, of an arm on the said rocker-shaft, an actuating cam, a bar connected with the said arm and acted upon by the said cam, and means to adjust the connection d of the bar lengthwise of the arm and simultaneously therewith effect an angular adjustvment of the bar relatively to the cam, wherebythe timing of the cams action is quickened, substantially as described. l

3. The combination with the camV 50 and side cam 64, of the lever 5lV formed with the yoke iitted't-o the exterior of ,the cam 50, the arm 58, the link 54 connecting said lever and arm, the rocker-shaft 59 connected to the said arm so as to rotate therewith but to move endwise relatively thereto, -the lever 65 acted upon by cam 64 and moving rocker-shaft 59 lengthwise,a spring acting in opposition to the cam 64, and a thread-guide carried by the said rocker-shaft, substantially as described.

4. The combination with the rocker-shaft 59-having a hole through it, of the cylindrical pin 69 adjustable in-the said hole, the clamping screw 70, block 7l carried by the said pin and having a hole therethrough, the threadguide having a cylindrical stem, adjustable in the hole of said block and the clamping screw 73, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HEBERA o. PETER-s. f

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