US2705504A - Gear train arrangement in the driving mechanism of weaving looms - Google Patents

Description

April 5, p c Ng GEAR TRAIN ARRANGEMENT IN THE DRIVING MECHANISM OF WEAVING LOOMS Filed Sept. 27, 1951 3 Sheets-Shoot 1 Jaime [c 120! %%mbw April 5, 1955 J. PICANOL ,504

GEAR TRAIN ARRANGEMENT IN THE DRIVING MECHANISM OF WEAVING LOOMS Filed Sept. 27, 1951 5 Sheets-Sheet 2 TIDE/Vi)";

United States Patent GEAR TRAIN ARRANGEMENT IN THE DRIVING MECHANISM OF WEAVING LOOMS Jaime Picanol, Zandberg, Zillebeke-lez-Ypres, Belgium Application September 27, 1951, Serial No. 248,615 2 Claims. (Cl. 139-1) The present invention relates to weaving looms and, more particularly, to the gearing used in the driving means of said looms.

In modern weaving looms the driving arrangement for the picker shaft is such that, at each revolution of the crank shaft, the driving mechanism of the loom and, more specifically the gearing thereof, is strongly and unequally stressed. This is due to the fact that the picker shaft drive operates periodically at a constant rythm, whereby the gear train is always stressed at certain specific points thereof. Examination of said points will show that, in due time, a few teeth only of the gears wear down, to a dangerously high value, whereas the remaining teeth of the gears are perfectly sound. For obviating this difliculty, it is the usual practice of displacing periodically the gears on their shaft so as to change the meshing relation therebetween. Unfortunately, however, the current weaving looms do not embody the means to effectuate this operation easily so that said loom has to be dismantled, almost, whereby many parts have to be removed and replaced with consequent long periods during which the loom is idle. As a matter of fact, it is sometimes considered more advantageous to let the gears wear down completely, after which they are simply replaced with new ones. Of course, this replacement necessitates the shutting down of the loom and, furthermore, gears have to be scrapped on which only a few teeth are worn down, the rest of the teeth being perfectly serviceable.

The present invention has been conceived to avoid the disadvantages noted above and to provide convenient rapid and economical means for the periodic shifting of the relative position between the gears of the loom drive.

According to the invention the gears are constituted by a toothed rim proper having a hub and, between said rim and said hub mutual securing means in angular positions relatively variable, either progressively or according to predetermined conditions. In a simple and economical embodiment, the hub carries at least one flange, provided with a certain number of apertures, the

toothed rim having corresponding apertures adapted to register with those of the hub and in apertures suitable securing means can be inserted. Thus, it is possible to displace angularly the rim with respect to the hub and to secure both mutually in any desired angular position. It is only necessary that the said securing means be easily accessible and comfortably operable to simplify, even accelerate, the operation of which registered changing the relative angular position of the gears in the loom drive and, consequently, to change periodically the position of the teeth receiving the greatest stresses from the operation of the picking mechanism.

The object of the invention, therefore, resides in the provision of improved means for efficiently, simply and economically effecting the uniform distribution of wear in the gear trains of a weaving loom driving device.

As an example, and for purposes of illustration, an embodiment of the invention is shown in the annexed drawings wherein:

Figure 1 is a lateral elevation view of the driving mechanism of a weaving loom,

Figure 2 is an enlarged view of the gears interposed between the driving shaft and the picking shaft, and

Figure 3 is a section taken on line III-III of Figure 1.

Referring to the drawings, wherein similar reference characters represent corresponding parts throughout, the

main driving shaft of the motor 1 carries a pinion 2 meshing with the gear rim 3 mounted on the crank shaft This gear rim 3 is secured to a hub 5 keyed on said crank shaft 4. For that purpose, the hub carries an annular flange 6 formed marginally with a series of equally spaced apertures 7 (in the present instant in the number of 12) whereas the gear .rim 3 has only three apertures, which apertures receive securing bolts 8 extending also through the corresponding apertures of the hub 6. Obviously, with this arrangement, it is possible Itlo bdisplace angularly the gear rim with respect to the A second gear rim 9 is concentrically superposed upon the gear rim 3 by means of securing bolts 10. Consequently, it is possible also to displace angularly the two gear rims 3 and 9 with respect to each other.

The gear rim 9 meshes with a gear rim 11 which is secured to the picking shaft 16 carrying the cam 15 of the picking mechanism. For that purpose, a sleeve 12 is keyed on the picking shaft 16 and the said sleeve carries a flange 13 which is apertured in correspondence with the gear rim 11, so that said registering apertures be engaged for securing together the gear rim 11 to the flange 13 by means of bolts 14. With this arrangement, also, it is possible to vary the relative angular position between gear rim 11 and the sleeve 12.

From the foregoing, it should be clear that the present invention is an advance in the art of loom driving mechanism since, due to the particular arrangement of the gears noted above, it will be possible, by the simple expedient of removing and displacing ordinary bolts, to modify without trouble, rapidly and economically the relative angular position of various gear rims with respect to their supporting hub, whereby the periodic stresses will be carried by fresh teeth of the gear train so as to prolong considerably the useful life of the gears until all teeth thereof are equally worn.

Obviously, the operation above can be eifected periodically or at any time found opportune, the said angular displacement depending evidently upon the stresses imparted to the gears and, specifically, of the number of places stressed strongly for each revolution of the gears considered.

Naturally, the number of apertures and bolts required will vary and must be determined for each specific application. It should be possible also to guide properly the toothed rim upon its hub and to interpose between hub and rim, means adapted to rotate said rim on said hub and to fixedly secure both together, under conditions such that the variation of the relative angular position therebetween be produced progressively.

It must be understood that various changes as to the shape, size and arrangement of parts can be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

What I claim is:

1. As an improvement in the driving gearing of a weaving loom having a driving pinion, a crank shaft and a picking shaft, a first gear mounted on the crank shaft, and comprising a hub keyed to said crank shaft and having an outwardly extending annular flange provided with a plurality of spaced concentric marginal apertures, a toothed rim having a rabbeted annular flange engaging the outer edge of said hub flange, said rabbeted flange having apertures to register with said hub flange apertures, a first series of securing bolts adapted to be passed through the registering apertures for clamping the hub and the toothed rim together, a second toothed rim having an annular flange surrounding the hub flange and abutting the annular rabbeted flange of said first named toothed rim, a second series of securing bolts passing through registering apertures in the annular flanges of said first and second toothed rims to removably secure said rims together, and a second gear keyed to said picking shaft and meshing with said second toothed rim, so constructed and arranged that said toothed rims can be angularly displaced relative to each other and to the hub 2. In the driving gearing of a weaving loom as claimed in claim 1, whereas said second gear also consists of a hub keyed to said picking shaft, of a toothed rim hav- 3 ing apertures to register with marginal apertures made in said last named hub, and of a third series of securing bolts to removably secure said last named toothed rim to said last named hub by passing through the registered apertures of the same. 5

References Cited in the file of this patent UNITED STATES PATENTS 781,219 Mills Ian. 31, 1905 10 4 Mathewson Apr. 23, 1907 Wall Oct. 1, 1912 Gossett Mar. 30, 1926 Hathaway -2 Oct. 4, 1927 Compton Mar. 3, 1931 Miller et a1 Aug. 21, 1934 FOREIGN PATENTS Great Britain of 1883 Great Britain of 1894

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