US1097675A - Sewing-machine. - Google Patents

Description

M. SANDT.

SEWING MACHINE.

APPLIUATION FILED MAY 23, 1912.

Patented May 26, 1914.

Wines COLUMBIA PLANOCIRAPH on wAemNu'r M uvc4 MAX SANDT, OF BIELEFELD, GERMANY,

FABRIK VQRMALS Dij'RKOPP 8: C0., BIELE ASSIGNOR TO BIELEFELDER MASCHINEN- FELID, OF BIELEFELD, GERMANY, A FIRM.

SEWINGJVIACHINE.

Specification of Letters Patent.

Application filed May 23, 1912.

Patented May 26, 191. Serial No. 699,240.

To all whom it may concern Be it known that I, MAX SANDT, a citizen of the Empire of Germany, and residing at Bielefeld, Germany, have invented certain new and useful Improvements in Sewing- Machines, of which the following is a specification.

My invention relates to driving gear for the needle-shaft of embroidery and similar sewing-machines.

A primary object of my invention is to provide an improved driving gear, for v1- brating the needle-shaft laterally, whlch not only is of very simple construction, but also both very suddenly reverses the direction of motion and causes a stoppage to occur shortly before in order to allow the needle to puncture the fabric.

One illustrative embodiment of my invention is diagrammatically represented by way of example in the accompanying drawing, wherein Figure 1 is a side elevation showing the entire driving gear, and Fig. 2 is a plan of the link motion only.

Referring to the drawing, the needle-shaft a is guided vertically in a guide I) which is provided with lateral arms 6 mounted in guides b so that the needle shaft may be laterally displaced. The needle-shaft is driven vertically by the crank 0 and the intermediate link (Z, provision being made in the link (Z for the lateral movement of the needle-shaft. To this end the link (Z is pr0- vided at its lower end with a sleeve (Z wherethrough slides an arm 6Z2. This arm (Z projects laterally from a collar (Z which is mounted on the needle shaft and held in ad justed position by a set screw d. Thus, as the needle shaft moves laterally the arm (Z slides in the sleeve (Z. The guide I) is oscillated laterally through the medium of a suitably arranged block 6 to which is at tached a connecting-rod f for imparting the oscillating motion.

The breadth of the stitch, 2'. e. the amount which the needle-shaft is to be oscillated or vibrated laterally, is determined by a peculiarly constructed link-mechanism. This mechanism comprises a triangular eccentric it fast on shaft 9 driven in suitable manner. This eccentric runs in a small box or link 2' and reciprocates the same and its guide in a rotatably mounted disk Z which is stationary when. the machine is running.

This disk Z is rotatable and can be adjusted so as to vary the position of the slot is, in which the guide 7; travels, from vertical to horizontal or any position therebetween. One end of the connecting-rod f is attached to the outside of the box 2' and its other end with the block 6, which is slidably mounted on one of the arms 6, being held in adjust ed position by a suitable set screw 6. N ow when the slot in the disk Z which guides the guide Z; is vertical, as shown in Fig. 1, it is obvious that the eccentric will reciprocate the link a vertically corresponding to the amount of the eccentricity and rock one end of the rod f up and down. In this position, therefore, although the eccentric rotates, practically no horizontal reciprocatory motion will be imparted to the needle-shai.t except that due to the change in angularity of the link f and this being very slight the needle will have practically no lateral move ment. Consequently, in this position of the gear the machine can be used for sewing like any ordinary sewing machine in which the needle-shaft is moved only vertically. If the disk f be rotated 90 to the right or left, as indicated in dotted lines in Fig. 1, the link together with its guide Z; is moved in a plane parallel with the fabric to be sewn, and consequently in this position the eccentric or cam it will operate to move the link 2 in the direction of the length of the rod f or horizontally and will thereby cause the fullest possible reciprocation of the red and consequently the needle will have the maximum lateral displacement. If, on the contrary, it is wished to diminish the lateral movement of the needle-shaft, the disk Z will be placed in an intermediate position. This disk Z may be adjusted by hand and to this end it is rotatably mounted on the shaft 9. It is obvious that the hand or any convenient mechanism may be used to hold the disk in adjusted position, as for instance, a friction pawl may be mounted to engage the periphery of the disk. It is not, however, deemed necessary to show any specific means to this end as such means are within the skill of any mechanic and no claim is laid to any particular means. It is to be noted that, in order to provide a dwell at each end of the lateral reciprocation of the needle-shaft and to thus permit penetration of the cloth, the eccentric or cam 71. has two portions 7a which are concentric with the shaft. \Vhen these 10 needle-shaft vertically displacealole therein,

and means for Vertically reciprocating the needle-shaft in said guide, of a rotatably adjustable slotted disk, a link having a guide able to reciprocate in the slot in the disk, a shaft, an eccentric fast on the shaft and r0- tatable in the link, and a connecting-rod having one end pivotally connected to the link and the other end pivotally connected to the first named guide.

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

MAX SANDT.

WVitnesses WVILLY FRIDLY, GEORGE AOKERMANN.

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

Images