US1718546A - Needle-motion mechanism for looms - Google Patents

Description

June 25, 1929.

E. F. DUNNE NEEDLE MOTION MECHANISM FOR LOOMS Filed July 16, 1927 3 SheetsSheet 1 Fig. 2.

elnventor,

i! Edmund F. Dunne, l

L\ B %Mo6%6w4;

y Attorney.

June 25, 1929. E. F. DUNNE NEEDLE MOTION MECHANISM FOR LOOMS Filed July 16, 1927 3 Sheets-Sheet 2 I I I I I I I Inventor, Edmund F. Dunne, B 7mw y Attorney.

June 25, 1929. DUNNE 1,718,546

NEEDLE MOTION MECHANISM FOR LOOMS Filed July 16 19,27 3 Sheets-Sheet 3 Patented June 25, 1929.

NJTED S1 1? AT E S QF EIQE.

EDMUND F. DUNNE, OF'YONKE'RS, NEW YORK; ASSIGNORTO ALEXANDER SMITH & SONS CARPET-COMPANY, OF YONKERS, NEW YORK, A CORPORATION OF NEW YORK.

NEEDLE-MOTION MECHANISM FOR LOOMS.

Application .filed 'July; 16,

This mechanism is applicable especially in connection with wide Axminster looms for weaving {rugs wherein the weft threads are laid by means of a long weft-carryingneedle.

The object of the invention is to insure the full withdrawal of the needle in time for the reed:to come forward-andbind the-filling. Further objects are to insure rapid movement withgentle stoppage of theneedle and its associated reciprocating actuating mecha nism, and to eliminate parts which would be subjected to excessive wear and breakage.

In the accompanying-three sheets of drawings, which form apart of this description is shown a;needle-motion inechanisminwhich the invention is embodied, the parts being in the position in which the needle has just completed its rearward stroke, except Fig. 2.

Figure lis aqplan view of the mechanism.

Fig. 2 is afront view; with needle at forward stroke.

Fig. 3 shows to a larger scale the shoe which prevents forward displacement of the pinion when not-engaged by a segment of the mutilated gear.

Fig. 4 is a vertical section to the larger scale on the line IVIV of Fig. 5 in which the teeth of the mutilated gear in front of the section line are indicated in dotted line.

Fig. 5 is a rear view omitting portions of the frame.

Fig. 6 is a vertical section on the line VIVI of Fig. 5 showing the mutilated gear, the brake shoe and the positioning pawl.

Fig. 7 is an end View with one of the driving gears broken away to show the cam for actuating the brake and the transmitting levers.

A shaft 5 which in the description will be regarded as the power shaft, carries a muti-. lated bevel gear 6 which is the driving gear of the weft needle-motion mechanism. This mechanism comprises a pinion 7 on a shaft 8. A crank 9 on the shaft connects through a pitman 10 with a gear segment 11 in mesh with a pinion 12 on a drum 13. Cords 14, 14 lead from the drum around sheaves 15, 15 and are attached to a clamp 16 at the butt end of a weft-needle 17 by which weft or filling threads are laid across the loom. The needle is guided in a needle-rail 18. By this mechanism the drum is caused to make two revolutions, more or less, alternately in each direction, thereby alternately projecting and retracting the needle. In order to absorb the 1927. Serial No. 206,236.;

momentum of the drum and connected reciprocating parts as each end of the needle stroke is approached, the'drum is provided with a brake run 19 which is engaged by a brake 20 which has a leather shoe. A cam 21-on the-= faces are cold, or to start the drum after havingstopped at'a pointwhich leaves the brake applied. Under such conditions, particularly oii nearing'the retracted-position of the needle when a segment of the mutilated gear runs out of mesh with the pinion, thepinion maynotbe carried fully to the position in which theneedle iscompletely retracted. If such should happen the. needle would lie partly in the work when the reed comes for- .ward to bind the filling and breakage would result.

To insure full movement of the pinion, during the time of initial brake operation and when the mutilated gear is about to run out of mesh, a ratchet 25 with a single tooth is carried by the pinion shaft. This is engaged by a pawl 26 which is carried by a ratchet lever 27. A cam 28 carried by the power shaft engages a roller 29 attached to a lever 30. This lever connects through a chain 31 on a sheave 32 with the ratchet lever, and this mechanism, having ample power, insures the positioning of the pinion, the needle and the connecting mechanism with the needle fully retracted, whether or not there should be excessive brake application at the time.

To prevent overrunning of the pinion and to hold it in position for reengagement by the next segment of the mutilated gear, a shoe 33 is carried by the shaft, and this shoe stops against the flange 34 on themutilated gear. Rearward displacement of the pinion is prevented by the pawl which is held advanced until the next segment begins to engage the pinion. The flange of the mutilated gear is notched or perforated at 35 opposite the entering teeth of each segment to permit the shoe to pass.

During movement from the position shown in Figs. 3 to 7, for one-ninth of a revolution of the mutilated gear, and one third of a cycle of the mechanism to give time for the reed to come forward and bind the filling, the flange 34L turns in front of the shoe 33 and continues to hold the pinion against forward displacement. At the same time the cam roll 29 rides on the top of the cam 28 thereby holding the pawl 26 in its forward position. On completion of this movement one of the perforations 35 comes opposite the shoe 33 and thereby permits the pinion to turn forward, the high point of the cam 21 which is under the end of the lever 22 is turned past thereby releasing the brake, and then the next section of the mutilated gear engages the pinion and actuates the mechanism to project the needle. A whole revolution is imparted to the pinion, thereby projccting the needle and again retracting it. During the slowing down of the drum and needle prior to reversal another high point on the cam 21 lifts the lever 22 and applies the brake to absorb the momentum. A spring 36 in the connection between the levers 22 and 23 limits the brake pressure, and is adjusted so that the friction will not be more than what is required to absorb the momentum of the drum and needle at the ends of the strokes under ordinary running conditions.

I claim 1. The combination with a weft needleinotion mechanism which is driven from a pinion and in which the pinion is intermit- 'tently driven by a mutilated gear, of a ratchet tooth carried with the pinion, and means for positioning the pinion by engagement with the ratchet tooth as the mutilated gear passes out of mesh with the pinion.

2. The combination wit-h a weft needlemotion mechanism which is driven from a pinion and in which the pinion is intermittently driven by a mutilated gear, of a. ratchet tooth carried with the pinion, a ratchet lever and pawl and means for positioning the pinion by operation of the ratchet lever as the mutilated gear passes out of mesh with the pinion.

3. The combination with a weft needle-- motion mechanism which is driven from a pinion and in which the pinion is intermitcarried with the pinion, and means for positioning the pinion by engagement with the ratchet tooth as the mutilated gear passes out of mesh with the pinion.

4. The combination with a weft needlemotion mechanism which is driven from a ried with the pinion, and means for position-' ing the pinion by engagement with the ratchet tooth as the mutilated gear passes out of mesh with the pinion.

EDMUND F. DUN NE.

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