US1191570A - Attachment for looms. - Google Patents

Description

F. F. COWDEN ATTACHMENT FOR LOOMS. APPLICATION HLED NOV-1.30, 1914.

Patented July 18, 1916.

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F. F. COWDEN ATTACHMENT r03 Looms. APPLICATION E lLED NOV-30. I914.

Patented July 18, 19.16.

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FRED F. COWDEN, OF NEW BEDFORD, MASSACHUSETTS.

ATTACHMENT FOR LOOMS.

Specification of Letters Patent.

Patented July 18, 1916.

Application filed November 30, 1914. Serial No. 874,808.

To all whom it may concern Be it known that I, FRED F. CowDEN, a citizen of the United States, and resident of New Bedford, county of Bristol, State of- Massachusetts, have invented certain new and useful Improvements in Attachments for Looms, of which the following is a specification.

This invention relates to looms for the production of leno work and has for one of its objects the provision of improved means for giving to certain of the harness frames the required half and return motion at the proper time with reference to the other events of the loom.

A further object is to provide means for this purpose which is adjustable so as to give the proper length of half and return movement and to provide the requisite dwell in the movement.

Other objects and the features of novelty will be apparent from the following description, taken in connection with the accompanying drawings, in which:

Figure 1 is a somewhat diagrammatic side elevation of a loom with one embodiment of my invention applied thereto; Fig. 2 is a skeleton perspective view of the mechanism for giving the half and return movement to certain of the harness frames; and Fig. 3 is a section on the line 3-3 of Fig. 2.

Referring to Fig. 1, 10 indicates the frame of the loom and 11 and 12 certain of the harness frames, the frame 11 being shown in the raised position and the frame 12 in the lowered position. The frames 11 and 12 are given the normal full stroke move' ment by means of the levers 13 and 14, these levers being actuated by the usual rocker 15. The crank or lay shaft of the loom is indicated at 16, and the rocker 15, in the loom illustrated, is actuated from the crank shaft 16 by means of the gearing l7 and the con necting rod 18, this arrangement being more fully described in the U. S. Patent No. 488,497, granted to Coldwell. The parts of the loom so far described, being of well known construction, a detail description thereof is deemed to be unnecessary.

As is well understood by those skilled in the art, it is necessary, in leno weaving, to give a jump or half and return movement I to certain of the harness frames independently of the usual full stroke movement. In the loom illustrated, the frames 11 and 12 are. actuated by cords or straps 19 which are connected with loops 20 through which the levers 13 and 14 project in the manner fully disclosed in the aforesaid Patent 488,497. In order to give the half and return movement to certain of the harness frames, there. is provided on the loom frame a shaft 21 having one or more quadrants 22 thereon which are connected with the loops 20 by means of straps 23. This construction may also be the same as shown and described in Patent No. 488,497, above referred to.

My improvements consist in the mechan sm whereby the shaft 21 is rocked. I provide on some rotating part of the loom, which has two revolutions for each full cycle of movements of the rocker 15, an arm 24 which actuates the shaft 21 through mechanism about to be described. The shaft 16 is such a rotating part and I therefore mount the arm 24 on the end of this shaft and in order to permit angular adjustment of the arm about the axis of the shaft, I secure the arm by means of set screws 25. A bracket 26 of any suitable design and supporting a stud 27 is secured on the frame of the loom. A bell crank lever 28 is pivotally mounted on the stud 27 and the arm 29 of this lever isprovide'd with a longitudinal slot 30 and has secured thereto one end of a link 31. The link 31 is made adjustable relatively to the arm 29 by providing a pin 32, which is adjustable in the slot 30 and secured in any desired position therein by means of a nut 33. The arm 24 is also preferably provided with a slot 34 and the link 31 is made adjustable relatively to this arm by a connection similar to that just described. This connection is illustrated in detail in Fig. 3.

An arm 35 having a longitudinal slot 36 is adjustably secured on the shaft 21 by a set screw 37 and a link 38 has an adjustable connection with the arm 35 similar to that shown in Fig. 3, and has its lower end connected with the arm 39 of the bell crank 28 by a universal joint 40.

The axis of the stud 27 is parallel with the shaft 16 and the shaft 21 is arranged at right angles to the shaft 16, so that in order to form an operative connection between the arm 39 of the bell crank lever and the arm 35 it is necessary to provide some formof universal joint, such as is illustrated at 40.

The operation of the mechanism is as follows: The frames 11' and 12 are given their usual full stroke movement by the levers 13 and 14, and the rocking of the shaft 21 effects the half and return movement of the frames. By changing the angular position of the arm 24 on the shaft 16, the time of the half and return movement may be varied wholly independent of the movements of the rocker 15. It will' be understood that the arm 24: has a continuous rotating movement which gives an oscillating movement to the bell crank lever 28 and the parts are so adjusted that the link 38 and shaft 21 will have a comparatively long dwell, this being accomplished by arranging the arms 24 and 39 so that they pass their dead centers in succession. The degree of rocking of the shaft 21 may be varied by adjusting the different connections of the links 31 and 38 and also the amount of dwell may be varied by adjusting the link 31, because the duration of the dwell will depend largely upon the angular position of the arm 29 as the arm 24 passes the centers. In this way, it is possible to properly time the half and return movement and the duration of the dwell therein, so as to have the desired flexibility in the operation. This results. in avoiding breakage of the threads due to insuflicient dwell or improper timing and therefore the production of the looms provided with my improvements is greatly increased.

Having thus described my invention, what I claim is: i

1. In a loom, the combination of a plurality of harness frames, mechanism for giving to said frames the normal full stroke movement rocker means for actuating cer tain of said frames independently of said mechanism to give a half stroke movement thereto, a member having two revolutions to each complete cycle of movements of said mechanism, means actuated by said member and angularly adjustable relatively thereto about the axis of rotation, a bell crank lever, link connecting one arm of said lever with the last mentioned means to oscillate the lever, and connections between the other arm of said lever and said rocker means.

.2. In a loom, the combination of a plurality of harness frames, mechanism for giving to said frames the normal full stroke movement, rocker means for actuating certain of sald frames independently of said mechanism to give a half stroke movement thereto, a member having two revolutions to each complete cycle of movements of said mechanism, means actuated by said member and angularly adjustable relatively thereto about the axis of rotation, a bell crank lever having a fixed fulcrum and a slotted arm, a link connecting the last mentioned means with said slotted arm and adjustable relatively to the latter, and connections between the other arm of said lever and said rocker means.

8. In a loom, the combination of plurality of harness frames, mechanism for giving to said frames the normal full stroke movement, rocker means for actuating certain of said frames independently of said mechanism to give a half stroke movement thereto, a member having two revolutions to each complete cycle of movements of said mechanism, a slotted arm carried by said member and angularly adjustable relatively thereto about the axis of rotation, a bell crank lever having a fixed fulcrum and a slotted arm, a link connecting said arms and adjustable along the slots thereof, an arm operatively connected with said rocker means, and a link connecting the last mentioned arm with the other arm of said bell crank lever.

4. In a loom, the combination of a plurality of harness frames, mechanism for giving to said frames the normal full stroke movement, rocker means for actuating certain of said frames independently of said mechanism to give a half stroke movement thereto, a member having two revolutions to each complete cycle of movements of said mechanism, a slotted arm carried by said member and angularly adjustable relatively thereto about the axis of rotation, a bell crank lever having a fixed fulcrum and a slotted arm, a link connecting said arms and adjustable along the slots thereof, a slotted arm operatively connected with said rocker means, and a link adjustable along the slot in the last mentioned arm and connected with the other arm of said bell crank lever.

In testimony whereof I affix my signature in presence of two witnesses.

FRED F. COWDEN.

WVitnesses:

CHAs. N. RICHMOND, CHAS. A. DAMON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D. C.

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