US699067A

US699067A - Tension mechanism for the lower threads of sewing-machines.

Info

Publication number: US699067A
Application number: US7212101A
Authority: US
Inventors: Georg Gottwald Beitzel
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-08-15
Filing date: 1901-08-15
Publication date: 1902-04-29
Anticipated expiration: 1919-04-29

Description

Patented Apr. 29,1902. A?. G.. BEITZEL.

TENSIUN HEGHANISM FDR THE LOWER VTHREADS 0F SEWING MACHINES.

- (Appucmon mpd' Aug. 15, 1901.)

Lgf

@for/167@ (No Model.)

wise.

UNITED STATES PATENT OFFICE.

GEORG GOT'IWALD BEITZEL, OF COPENHAGEN, DENMARK.

TENSION MECHANISM FOR THE LOWER THREADS OF SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 699,067, dated April 29, 1902. Application ledAugust 15, 1901. Serial No. 72,121- (No model.)

T0 tZZ whom t may concern:

Be it known that I, GEORG GoTTwALD BEITZEL, manufacturer, of 23 Nrrebrogade, Copenhagen, in the Kingdom of Denmark, have invented certain new and useful Improvements in Tightenin g Mechanism for the 'Lower Threads ofASewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The present invention refers to a tightening mechanism for the lower thread of sewing-machines.

The invention is on the accompanying drawings shown in two forms of construction.

Figure l shows the one constructional form in perpendicular section. Fig. 2 is the spoolhouse connected up. Figs. 3 to 5 are details.

a is the spool,upon which the lower thread is wound. The spool is a dat one and placed inside a spool-house consisting of two iiat cups b and c. The cup b has a central pin cl fitting into a boring in a pin e on the other cup c, so that .the cups when put on tcp of one another are prevented from moving siderIhe rims of the cups are plane, so that the thread,'which from the spool d, mounted upon the pin e, is passed out between the rims, is held fast when the Fcups are pressed together.

The spool-house is placed in the catcher f of the machine, so that one of the cups bears against a fixed point, while the other cup is subjected to an elastic pressure that forces the rims of the cups togetherat the same time as lthe aforesaid cup is pressed against the above mentioned fixed point. However, when the loop of the upper thread is to be slipped around the spool-house by the catcher the pressure ofthe spool-house against the fixed point must cease in order that the thread can pass over the spool-house. Arrangements whereby thisis obtained are de scribed in the following:

In the constructional form shown in Fig. 1`

wheels, from a shaft p.

the catcher f rotates on a vertical axis, it being mounted turnably up'on a hollow perpendicular spindle g, which by means of a setscrew 7i is xed upon a rigid arm t. The catcher is made to rotate, by means of bevel- On the table of the machine there is placed a plate k. In the hollow spindle g is inserted a rod m, which pressed by a spring n forces the spool-house b. cup against the said plate 7a. When the spring n presses upon the lowermost end of the rod m, the rims of the cups'b and c are pressed against each other, and the tightening of the lower thread is thereby obtained. By means of an adj usting-screw-o the spring n can be made to press more or less against the rod m, and the pressure between the rims of the cups canthereby be regulated, so that the tightening of the lower thread may be greater or smaller,as might be desirable. On

the shaftp is mounted a disk g, having a projection r, and between the disk q and the spring n is arranged a pin s, capable of sliding in a hole in the arm t. When the projection r strikes against the end .of the rod s, this one forces down the spring n, whereby the rod m and the cups b c are again released.

By pushing aside the plate k the spool-house A may be removed.

Having now particularly described and ascertained the nature ofthe said invention and in what manner the same is to be performed, I declare that what I claim is- 1. Anapparatus for tightening the lower thread of sewing-machines,comprisinga rigid arm provided with a fastening, a hollow spindle detachably secured upon said arm byV means of said fastening, a catcher revolubly mounted upon said spindle, a rod slidably mounted within said hollow spindle, a revoluble spool-house mounted wi thin said cat-cher and centrally engaged by said rod, and means for intermittingly pressing said rod against said spool-house.

2. An apparatus for tightening the lower thread of sewing-machines,comprisinga rigid arm provided with a fastening',a catcher revolubly mounted upon said spindle, a rod slidably mounted within said hollow spindle, a.v revoluble spool-house mounted within said IQO I "s: utCatcher and centrally engaged by said rod, a

my invention I have signed my namevin presence of two subscribing Witnesses.

GEORG GOTTWALD BEITZEL.

Witnesses:

P. HoFMAN-BANG, J. C. JACoBsEN.

.spring for pressing said rod into engagement .with said spool-house, means controllable at will for adjusting the tension of said spring, and cam mechanism for intermittingly aetuating said spring.

In testimony that. I claim the foregoing as l