US679906A - Looper-operating mechanism for sewing-machines. - Google Patents

Description

Patented Aug 6, IBM.

7 L., ONDERDUNK. LOOPEB OPERATING MECHANISM FOR SEWING MACHINES.

(Applicatioxi filed Aug 23, 1897.) (No Model.)

THE norms Pmni 00,, momma. WASHINGTON D c.

UNITED I STATES PATENT OFFICE.

LANSING ONDERDONK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS.

LOOPER-OPERATING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 679,906, dated August 6, 1901. Application filed August 23, 1897. Serial No. 649,245. (No model.)

To all whom it may concern:

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a description, reference being hadto the accompanying drawings and to the letters of reference marked thereon.

Myinvention relates to an improvement in sewing-machines, and especially to a looperoperating mechanism for chain-stitch machines. In a'number of prior patents issued to me October 12, 1897, and numbered 591,541, 591,542, 591,546, 591,559, and 591,538, I have shown, described, and claimed various forms of looper-operating mechanisms, in all of which an inclined pin or rod supported on the forward end of a driving-shaft engages a looper-carrier supported on a transverse shaft, which shaft practically forms oppositely-extendin g journals or trunnions for the looper-carrier, which journals or trunnions are mounted to slide and rock in fixed bearings on the machine-frame, the aforesaid pin or rod engaging the looper-carrier in such a Way that by reason of its being confined in bearings it has a reciprocating sidewise movement and an oscillating forward-and-backward movement as the driving-shaft is rotated.

The object of the present invention is to provide for a series of adjustments in machines in which the looper is operated by an inclined crank,[such adjustments being provided so that no matter whether there are slight defects in the construction of the various parts which are put together to make up the looperoperating mechanism these defects may be remedied by these adjustments. By these adjustments, therefore, the transverse shaft may be arranged at different distances from the end of the main shaft of the different Ina-1 chines, thethrow of the looper may be varied, and the center of movement be changed at will without disturbing the proper relation of the various centers above referred to.

In the accompanying drawings,which illustrate the invention, Figure 1 represents a portion of a sewing-machine,'partly in section, embodying my invention. Fig. 2 is a sectional view of the end of the driving-shaft. Fig. 3 is an end view of the head of the drivingshaft. Fig. 4 is a sectional side elevation showing a modification of the arrangement for attaching the inclined pin to the head of the main shaft. Fig. 5 is a similar view showing an arrangement for changing the angle of the inclined rod orpin, and Fig. 6 is a plan View of Fig. 5. Fig. 7is a view similar to Fig. 5, illustrating the adjustment applied to Fig. 1.

In the drawings, referring first to Figs. 1, 2, and 3, A represents the driving-shaft, having on its outer end a head secured thereto in any suitable manner. C represents the needle-bar; D, the looper-carrier; F, the oppositely-extending trunnions or journals by which the looper'carrier is supported in bearings near the forward end of the bed-plate of the machine. The looper is shown atf, and the looper-carrier has wings g,which embrace the inclined operating pin or rod G, which passes through a fulcrum-block h, set in the looper-carrier. Formed in the face of the enlarged head on the end of the driving-shaft is a dovetailed groove H, withinwhich slides and is adjustable across the face of the driving-shaft theenlarged head of the inclined pin or rod G. It will be seen that by raising or lowering within certain limits the head of the pin or rod G in the dovetailed groove in the face of the enlarged head on the end of the shaft no change is effected in the relations of the centers of the driving-shaft, transverse shaft, or pin or rod to each other, but there is merely a variation in the distance from the end of the driving-shaft at which these centers are coincident.

Figs. 5 and 6 illustrate an arrangement whereby not only the distance of the face of the driving-pin from the center of the main shaft may be adjusted, but also an arrangement at which the angle of the driving-pin may also be changed, thus giving more or less pitch to the driving-pin and increasing or diminishing the throw of the looper. The driving-pin is adjustable independently of the block that holds it at any angle byarranging the block with an opening through which the pin or rod G passes, this opening being enlarged toward either end and the pin or rod G being pivoted upon opposite sides of the pivot a and by loosening one screw and tightening the other the pitch of the driving-pin will be increased or diminished, and consequently the throw of the looper changed. This change would also vary the point at which the center of the driving-pin would cross the center line of the main shaft, and as this is necessarily thecenter of the transverse shaft the adjustable block to which the pin is secured would have to be moved to a point that would bring the driving-pin to the common center. To make the first have to be loosened, thus leaving the driving-pin free should the block move to the necessary point to give the desired angle to the driving-pin, after which the screws could be set to hold the driving-pin firmly in the d esired position or angle.

As shown in Fig, 4, the driving-pin is secured to a curved block, which slides in a correspondingly-shaped groove in the head on the end of the main shaft. This block is seon red by two set-screws 0 0 which are loosjustment. The curve to the block is on the arc of a circle, of which the crossing-point of the three centers above referred to is the center, and thus the adjustment of this block one way orthe other does not change the relative centers or the throw of the looper that may occur. It will be noticed, however, that the adjustments of the pin orrod G by means of the screws a 03, as illustrated in Fig. 7, are more essential in the use of the straight block K or enlarged head of the pin G than in the curved one.

Havingthus described my invention, what I. claimas new, and desire to secure by Letters Patent, is

1. The herein-described looper-operating mechanism, comprising a driving-shaft, a looper carrier, a block radially adjustable across the face of the driving-shaft, a rigid inclined pin or rod secured at or near one end to said block,;and means carried by said block adjustment properly, the two screws would for adjusting the inclination of said pin or rod with reference ,to the axis of the driving-shaft;

1 substantially as'de'scribed.

2. The herein-described looper-operating ime'chan'ism, comprising a driving-shaft, a looper-carri'er, a block radially adjustable across the face of the driving-shaft, a rigid tinclin'ed pin or red, pivotally secured to said block, and means carried by said block for adjusting the pin or rod on its pivot to vary the inclination of said pin or rod; substani tially as described.

ened and set to meet the requirements of adf 3. The herein-described looper-operatin g mechanism, comprising a driving-shaft, a v

looper-carrier, a block radially adjustable across the face of the driving-shaft, a rigid inclined pin or rod, pivotally secured to said block, and means carried by said block. for adjusting the pin or red on its pivot to vary I the inclination of said pin or rod, said means including stop-screws arranged on opposite sides of the piv0tpoint; substantially as described.

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

LANSING ONDERDONK.

Witnesses:

A. H. HATCH, J. S. HOLT.

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