SU659661A1 - Device for automatic weft-threading into loom shuttle - Google Patents

Description

Fo is the angle of inclination of the tangent to the brachistochrone at the starting point of 90.

The reliability of threading is related to the time that elapses from the beginning to the moment when the hook is attached to the fitting sock. The shorter the time, the greater the likelihood of the nonadhesive thread to the tool.

With an increase in charging time, the likelihood of noniopad nitrate increases :; ;; nrisiosleleiiie, which leads to its precipice. Increased thread breakage reduces the reliability of the machine.

Wavelength formation, to her the surface of the hook and toe along the brachistochrone, taking into account the chippings, ensures that the thread gets into the device in the shortest possible time.

On fng. 1 shows the device, obsh, iy kind; in fig. 2 - the same, left view; in fig. 3 - the same, right side view; Ia fng. 4 graphical definition of brachistochrone for given coordinates of the initial and final points of this curve.

The automatic winding device for the weft yarn in the shuttle (Fig. 1-3) contains a U-shaped case / with a duct for nnti 2, a toe 3 and a hook 4 on its side walls, a peephole 5. Working surfaces 6, 7 of the hook 4 and toe 5 brachystochrone wavelines (the fastest descent line).

To find the brachistochrone from the point with the X coordinates (to the point with the Xa coordinates, UA is determined by the coefficient T / C, the angle of inclination of the tangent at the starting point of 90 °. Then, setting the current values with an interval of, for example, 10 °, we calculate Jj and Y values {for each of the current values of firi 1 and

X, for each point we find the relation - ,,.

J;

Next, we find the relationship., And, compare.,

X /

a) with the received ziacheni mn y, youY

we take the value of a

X ,.

If the difference

appealing to attitude

Xi

X,

is significant, then iroizYi Y. under the calculation of X and Y in the interval zia,. BUT,

C 9 / -1 at intervals, beginning with i and f;

 Have a

V.

for example, at 1 ° and choose the values of -L-a.

Next, find the parameter R from the ratio A. .. U. .., p

X ,, y, „

Multiplying each of the current values of L, - and Y ,; Ia R, iahodt current values - (and Y and but and the ray daiim build bra. hystochroy.

An example of building brachistochrone for a point with coordinates 8, VA 7.3, with a coefficient of friction / (0.1 is shown in the tab, face and in Fig. 4.

T a b l and c a

The device can be made as a full-lamp or cast, and can be equipped with a means for braking the thread.

The fixture is used as follows. After inserting the spool into the shuttle, during the 1st prokidka cheliok, the thread slides over the surfaces 6 and 7 of the hook 4 of the sock 3 and is inserted into the channel 2 under the hook 4 and iosok 3. With the 2nd irocid, the thread is outputted into the hatchet 5.

Making the working surfaces 6 and 7 of the hook 4 and the toe 3 along the line of the fastest descent creates the most favorable conditions for winding the iichi, which increases the reliability of the device.

Claims (1)

1. Device for automatic winding of the yarn into a loom of a loom, containing a U-shaped body rigidly fixed in a nest of a cheliok, having a hook and a sock on the side walls for winding the yarn with curvilinear working surfaces and an exit eye, o This is so because, in order to increase the work reliability and reliability, the working and working surfaces of the hook and the toe are a brachistochrone, defined by the system of equations:  - I- / sin 2 :; - - - -r- + F R / Ccos I  In TGGl h. 9L -y Y -.- T .., - | P () i.,, 1 H-l y / p-cos4-r / (K V1 (-1 -5 nS.-cf -., 1 + f 2ЛvT-ln (tg9-Л) + 1 + Where: X and Y - current coordinates of brachistochrone; K is a parameter determined depending on the boundary conditions; K - coefficient of friction of the thread on the material surfaces of the hook and toe; F is the current angle of inclination of the tangent to the brachistochrone; Fo is the angle of inclination of the tangent to the brachistochrone at the starting point of 90 °. A source of information taken into account during the examination: 1. USSR author's certificate 35 DU 132577, cl. D 03 J 5/22, 1960. fi3. 7 1 .J I i / f /.2.4