US2753895A - Hydraulic check device for looms - Google Patents

Description

July 10, 1956 A. E. ZARN 2,753,895

HYDRAULIC CHECK DEVICE FOR LOOMS Filed April 9, 1954 INVENTOR.

BY S:

United States Patent r ce HYDRAULIC CHECK DEVICE FOR LOOMS Adolphe Emile Zarn, Zurich, Switzerland, assignor to Pneumafil Corporation, Charlotte, N. C., a corporation of Delaware Application April 9, 1954, Serial No. 422,175

6 Claims. (Cl. 139-161) This invention relates to a hydraulic check device for looms and more particularly to a hydraulic check device adapted to cushion movement of the picker stick during operation of the loom.

Hydraulic check devices heretofore used have their braking effect adjusted automatically in accordance with the requirements of the loom. This improves the efficiency of the loom and the quality of the fabrics Woven on the loom. A disadvantage, however, is an increase in the length of the lay so that it is impossible to fit the check device in some mills because of lack of space. The results obtained by checking the shuttle of the loom led to experimental work to cushion the picker stick after striking. The space available underneath the lay of the looms is generally too small to permit the conventional hydraulic check device to be placed therein. Where, however, it is possible to place the conventional hydraulic check device underneath the lay of the looms, a saving of material and a marked decrease in loom vibrations is obtained.

The chief object of the present invention is to provide a new hydraulic check device for weaving looms adapted to cushion movement of the picker stick in either direction and which can be fitted easily underneath the lay of the loom.

An object of the invention is to provide an inexpensive hydraulic check device for weaving looms which comprises a housing filled with oil and compressed air and containing tapered recesses for movement of pistons placed within the housing. One piston operates when the shuttle is hitting a picker and the other when the picker stick strikes. The cushioning effect is obtained in both utmost positions of the picker stick. Other objects of the invention will be readily perceived from the following description.

This invention relates to a hydraulic check device for looms adapted to cushion movement of the picker stick in either direction which comprises in combination a housing adapted to be placed beneath the lay of the loom, the housing including two tapered recesses and being partially filled with oil and the balance with compressed air, pistons reciprocable in said recesses, mechanism connected to said pistons, said mechanism being adapted to be engaged by the picker stick upon movement thereof whereby the pistons serve to cushion movement of the picker stick of the loom, one of said pistons serving to brake movement of the incoming shuttle of the loom, the second piston serving to cushion movement of the picker stick when striking.

The attached drawing illustrates a preferred embodiment of the invention in which Figure 1 is a sectional View through the hydraulic check device;

Figure 2 is a sectional View through the check device shown in Figure 1; and

Figure 3 is a diagrammatic view illustrating the fitting of the check device underneath the lay of the loom.

2,753,895 Patented July 10, 1956 Referring to the attached drawing there is shown the check device of the present invention which includes an air and oil type housing 1 fitted underneath the lay 3 of the loom by means of a plate 2 emerging from the housing 1; the housing contains two tapered recesses 4 and 5. Pistons 6 and 7 are placed in the recesses 4 and 5 of the housing and are movable back and forth therein. Pistons 6 and 7 slide in bearings 8 and 9. Rubber rings 10 and 11 are provided to seal against loss of oil. To prevent dust from entering the housing, rubber rings 12 and 13 are provided in the bearings. Both pistons 6 and 7 are provided with cross pins 14 and 15 which limit the forward stroke of the piston by contacting or hitting stop rings 16 and 17.

A recess 18 in housing 1 serves as an air tank. An inlet valve 20 is placed in the housing about at the oil level 19 and is removed when the oil is poured in the housing. Inlet valve 20 is placed at the oil level in order to prevent oil from flooding the air chamber or recess 18. Recess 18 may be filled with compressed air by means of a hand pump (not shown) connected through the inlet valve.

Piston 6 is connected by its head 21 to a sling 22 surrounding the picker stick 23 (refer to Figure 3).

In operation of the check device as shown in Figure 3 the incoming shuttle is hitting or striking the picker 24 and is brought to rest. To protect the wooden picker stick 23, a cover plate or cap 25 is provided on sling 22. From the moment the shuttle contacts picker 24, the picker stick 23 is slowed down until it comes to rest in its utmost back position (shown in dotted lines in Figure 3) because of the braking effect of piston 6 when pushed into the oil filled recess 4. The shuttle is maintained in this utmost position by a binder or brake tongue (not shown).

Piston 7 is pushed in the cylinder 5 when the picker stick 23 hits head 26 with full speed. Although the speed of the picker stick is now very much higher than during the former braking operation in the left end position the adjustable braking effect of the outflowing oil insures smooth braking. The conventional spring (not shown) at the picker stick foot will pull the stick back until it again comes to a rest on sling 22. The utmost positions of the picket stick are shown in dotted lines.

It will be understood the embodiment of the invention illustrated in the drawing can be altered if desired. For example, it is not necessary to locate the two pistons or plungers one above the other, since pistons could be placed in other suitable locations. It is not necessary that both pistons work in the same oil since if desired, a wall could separate the pistons thereby providing two separate oil compartments. The check device checks or brakes the picker stick in either direction and its special location underneath the lay of the loom avoids an increase in the length of the lay.

While I have described a preferred embodiment of the invention, it will be understood the invention is not limited thereto since it may be otherwise embodied within the scope of the following claims.

I claim:

1. In a loom having a lay, a shuttle, and a picker stick: a hydraulic check device serving to cushion movement of the picker stick in either direction, said check device comprising the combination of a housing adapted to be placed beneath the lay of the loom, said housing including two tapered recesses and being filled partially with oil and the balance with compressed air, pistons reciprocable in said recesses, mechanism connected to said pistons, said mechanism being adapted to be engaged by the picker stick upon movement thereof whereby said pistons serve to cushion movement of the picker stick of the loom, one of said pistons serving to brake movement of the incoming shuttle of the loom, the second piston serving to cushion movement of the picker stick when striking.

2. A hydraulic check device according to claim 1 in which a sling connects the picker stick to the first piston.

3. A hydraulic check device according to claim 2 in which a cap is provided on the end of the sling to contact the picker stick.

4. A hydraulic check device according to claim 1 in which the recesses are connected by a duct.

5. A hydraulic check device according to claim 1 in which the pistons are placed one above the other.

6. A hydraulic check device according to claim 1 including an inlet valve placed at the level of the oil contained in the housing.

References Cited in the file of this patent UNITED STATES PATENTS Cornins July 2, 1901 Balogh May 9, 1950 Hufierd Feb. 6, 1951 FOREIGN PATENTS Great Britain June 4, 1952

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