US2127771A

US2127771A - Thread guide brake

Info

Publication number: US2127771A
Application number: US3164A
Authority: US
Inventors: Heinitz Woldemar
Original assignee: Schubert und Salzer Maschinenfabrik AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1934-02-06
Filing date: 1935-01-23
Publication date: 1938-08-23
Anticipated expiration: 1955-08-23

Description

Aug. 23, 1938. w. HEINITZ 2,127,771

THREAD GUIDE BRAKE Filed Jan. 23, 1935 5 3 4 i if 9 5 Patented Aug. 23, 1938 UNITED STATES PATENT OFFICE I V 2.127.171 mam coma name Application Ill zclaims.

The present invention relates to flat knitting machines and more particularly to the thread guide brakes of such machines. I

It is already well known to provide two thread 5 guide brakes for the thread guide rod to prevent rebound of thisrod even at higher speeds.

The arrangement of two thread u de brakes, however, allows a relatively small increase of the speed only. According to the present invention, however,

the speed during narrowing may nearly be increased to the normal speed the machine has during the manufacture of plain rows of loops.

With this object in view, the present invention consists in providing two thread guide brakes for each direction of the sinking movement, said thread guide brakes operating one after the other in such a manner, that the thread guide rod is held against the stop first by the action of the one brake and thenby the additional braking action of the second thread guide brake.

In the accompanying drawing, forming part of the specification, 'the invention is shown by way of example. i a

In the drawing:

Fig. 1 is a'front elevation of one construction of brake arrangementaccording to the invention,

Fig. 2 shows a view, similar to Fig. 1, of a modified construction of the invention and Fig. 3 is a broken away front elevation of a further modified brake arrangement in accord-' ance'with the invention.

Referring now to the example shown in Figur 35 1, the connecting rod l is reciprocated in the usual manner by means not shown in the drawing and carries bearings 2 in which a brake rod 3 is mounted. n the brake rod 3 are mounted the thread guide brakes 4 and 5. In bearings 6, also carried by the connecting rod l, a brake rod 1 is journalled on which the thread guide brakes 8 and 9 are mounted. Stops 4' and 5' provided at the thread guide brakes 4 and 5 respectively are adapted to act upon an intermediate memher in engaging a fork I l forming part of a sleeve Won the thread guide rod l2. Stops 8' and 9' provided at the thread guide brakes 8 and 9 respectively are adapted to act upon. an intermediate member i3 the free end of which engages a fork i4 forming part of a sleeve It on the thread guide rod l2. The arrangement is such, that the free end of the member i0 exactly fits the fork ll of the sleeve ll, while the free end of the member i3 engages the fork I. of the sleeve i l with some play. The movements of January 23, 1935, Serial No. 3,164 Germany February 6, 1934 the thread guide bar l2 are limited by fixed stops l5 and i6.

During movement of the connecting rod l in the direction of the arrow A in Fig. 1, the thread guide rod I2 is shifted by the intermediate member l0 actuated by the thread guide brake 5. The intermediate member i3 during this vshifting movement bears against the right hand prong I of thefork it of sleeve l4. If the thread guide rod it comes intocontact with the-fixed stop 10 IS, the intermediate member ill-is, during the continued movement of the connecting rod l, shifted further by the thread guide-brake 9 until it bears against the left hand prong of the fork It of the sleeve M. 15

The thread guide rod l2, therefore, is held against the fixed stop i5 first by the thread guide brake ti and later on also by the thread guide brake 9.

During movement of the connecting rod in 20 the direction of the arrow B in Figure l, the

thread guide rod i2 is shifted by the brake 5 acting upon. the intermediate member in. The intermediate member i3 during this movement bears against the left hand prong of the fork Hi of the sleeve It. If the thread guide rod it comes into contact with the fixed stop It, the intermediate member [3 is, during the continued movement of the connecting rod i, shifted further by the thread guide brake 8 until it bears against the right hand prong of the fork M of the sleeve MU Hereby, as described with reference to the movement of the thread guide rod It in the direction of the arrow A, the rod It also is held against the flxedstop i6 first by the thread guide brake l and later on by the thread guide brake 8 also.

According to the modification shown in Fig. 2. the thread guide brakes 4 and 5 are provided with stops or lugs ll and I8 respectively, while the thread guide brakes B and 9 are provided with stops or lugs l9 and 20 respectively. The distance between the lugs l1 and I8 is a little smaller than the distance between the lugs i9 and Ill. 4.5

Mounted on the thread guide rod i2 are sleeves 2i, 22 each having a. nose 2|, 22 respectively.

The stop or lug I8 is adapted to act upon the nose 2| during the movement .of the thread guide rod l2 in the direction of the arrow A. By to reason of the particular arrangement described above, a clearancestill exists between the stop or lug 20 and the nose 22' of the sleeve 22. As soon as the thread guide rod i2 comes into contact with the fixed stop It, the stop or lug 20, on

further movement of the connecting rod I, engages the nose 22', so that the thread guide rod i2 is held against the fixed stop I5 by the two stops or lugs I8 and 20. On movement of the thread guide rod I! in the opposite direction, i. e. in the direction of the arrow B, towards the fixed stop 16, the action of the brake arrangement is the same. First the lug ll acts on the nose 2|. of the sleeve 2| at which time a clearance still exists between the lug l9 and the nose 22- of the sleeve 22. When, however, the thread guide rod l2 comes into contact with the fixed stop I6, the lug I9 engages, during Iurther movement of the connecting rod l, the nose 22' of the sleeve 22, so that now the thread guide rod I2 is held against the fixed stop It by means of both lugs I1 and IS.

In Fig. 3 a modification is shown according to which the two thread guide brakes l and 5 are arranged directly one behind the other in the longitudinal direction of each brake rod and carry a lug I engaging a fork ll provided on the thread guide rod II. The jaws 25 and 26 of the brakes are, in a. well known manner, actuated by springs 21 and 28 respectively. The jaws 26 of the brake are a little shorter than the width of the bearing, while the corresponding spring 20 fits the bearing without play. The brake jaws 26, therefore, may slide upon the brake rod 3 and in each direction of movement of the thread guide rod l2 they come into action as soon as the thread guide rod engages the fixed stop. That is to say, during movement of the thread guide rod l2 in the direction of the arrow B, first the thread guide brake I and then the thread guide brake 5 comes into action, whereupon on movement in the direction of the arrow A also first the thread guide brake I and then the thread guide brake 5 comes into action, as the brake jaws of the latter had been shifted in their bearing.

The thread guide brake according to the invention may be used in connection with any kind of thread guide rods, i. e., for thread guide rods adapted for the manufacture or plain work as well as for thread guide rods adapted for making plated work.

Of course, the same eiIect is obtained, if the brakes are arranged side by side in a brake casing instead, as shown in Fig. 3, directly one behind the other.

What I claim is:

1. In a thread guide brake mechanism for flat knitting machines, a thread guide rod, a brake rod, a brake housing carried by said brake rod, a brake lug carried by said brake rod and subdividing said housing in two halves, a sleeve on said thread guide rod, a fork formed at said sleeve and adapted to receive the free end of said brake lug, a pair of brake vjaws exactly fitting one half of said brake housing, a spring cooperating with said brake jaws exactly fitting said one half of said brake housing, a second pair of jaws arranged with play in the other half of said brake housing, and a second spring cooperating with said second pair of brake jaws and exactly fitting said other half of said brake housing.

2. In a thread guide brake mechanism for fiat knitting machines, a thread guide rod, fixed stops limiting the reciprocating movements of said thread guide rod, a brake housing, and two brake members arranged in said brake housing and acting successively on said brake guide rod toward the end of its movement in either direction as limited by said fixed stops.

WOLDEMAR HEINI'IZ.