US1588665A - Box motion for looms - Google Patents

Description

Jime 15 1926.

c. A. DIGGINS BOX IOTION FOR LOUIS Filed July 25, 1924 Patented June 15, 19 26 UNITED STATES PATENT OFFICE.

CHARLES A. mu ing, on woken-Sana, MASSACHUSETTS. ASSIGNOR 'ro onomr'ron' & KNOWLES Loom worms, or WORCESTER, MASSACHUSETTS, A CORPORATION or mssxcntrsam.

Box ii'o'rron FOR LOOMS.

xp acaets filed July 25,

This invention relates to improvements in box motions for looms and an object of the invention is to provide an improved box motion operated by the pattern mechanism,

such as a dobby, of a loom.

In Patent No. 774,488 there is shown a box motion operated by a flexible connector which extends from a dobby jack. yielding connect-ion, which prevents positive actuation of the boxes, is located between the flexible connector and the box rod so that the box may be positioned for picking before the shed is entirely open. Also, the flexible connection as shown in said patent changes the limits of motion of the box rod when said flexible connection is moved from one notch to another in the dobby jack.

The principal object of my present invention is to overcome the aforesaid disadvantages by providing a cam of fixed throw which shall be effective to move the box rod positively the proper distance irrespective of the throw of the dobby jack. Also, a more particular object of my invention is to compensate for any changes which may affect the limits of motion of the box rod when the flexible connection is adjusted with respect to the dobby jack. I

l Vith these and other objects inview which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

F In the accompanying drawing, wherein one form of my invention is shown,

Fig. 1 is a side elevation of a loom having my invention applied thereto,

Fig. 2 is a rear elevation of the structure shown in Fig. 1 looking in the direction of arrow 2, Fig. 1,

Fig. 3 is a fragmentary top plan of the connector levers, and

Fig. 4' is a fragmentary elevation of the cam lever shown in position to raise the boxes.

In the drawings I have showna loom 10 1924. Serial No. 728,268.

mounted a roll 18. In order to impart motion tothe boxes on the opposite side of the loom I have provided a shaft 19 the remote end of which is connected by means of lever 20 to the box rod (not shown) opposite the one shown in Fig. 1 and the near end of shaft 19 has secured thereto a short arm 21 which is connected by means of link 22 to lever 23.. Lever 23is pivoted on stud 16 and has the rearward extension thereof provided with a roll 24. \Vhen the levers 15 and 23 are moved the boxes will be raised or lowered accordingly.

In order to actuate the box levers I provide a dobby mechanism Qihaving a series of dobby levers one of which is indicated at 26 and is provided with upper, and lower hooks 27 and 28, respectively. Two dobby acks 29 are pivoted as at 30 to the dobby frame and have their. intermediate portions pivoted to correspondinglevers 26 as at 31. The upper end of each lever or jack 29 is provided with a. series of notches 32. lVith the except-ion of rolls 18 and 24 the mechanism thus far described is of the usual construction.

My invention relates more particularly to the connections between the dobby harness levers 29 and the box levers and in carrying out my invention I provide a stand 4-0 secured to the arch of the loom and having journaled for loose motion therein a pair of shafts 41 and 42. Shaft 11 has secured. thereto by means of set screws upper and lower arms 43 and 4.4, respectively, which are independently adjustable with respect to each otherand in like manner shaft 42 has secured thereto upper and lower arms 4:5'and 4.6, respectively. It is to be under stood where boxes are to be used on each end of the loom asshown herein two dobby harness levers will be employed, each of which willbe connected to the upper arms as shown in Fig. 2, connector 47 being attached to arm and connector 48 being attached to arm 43.

Secured to the arches is a second stand 49 having loosely journaled thereon roll 50 over which pass chains 51 and 52 which are connected respectively to the depending arms 46 and 44'. After passing over the roll 50 the chains are attached to rigid'connectors 53 and 54, respectively, which are pivotally connected at their lower ends to cam levers 55 and 56, respectively, each of said levers being provided with a notch and a dwell portion 58 preferably concentric with stud 59 on which said cam levers are pivoted. The surface 60 between the dwell 58 and the notch 5'? is the rising portion of the cam by means of which the rolls on the box levers are depressed.

In the operation of my invention with the parts in tire position shown in Fig. 2 the levers 55 and 56 will be positioned with their rolls in the dctents of the cam levers and the boxes will be down. When the pattern mechanism calls one of the (lobby harness levers 29 the corresponding shaft and arms will be swung ina right hand direction to lift the operatively associated cam lever against action of its spring 61, the result of which is to cause the corresponding roll to be depressed to lift the forward end of the attached lever. In Fig. 4: l have shown the lever 55 raised and the roll 18 depressed.

The shed forming mechanism and the picking motion of a loom are usually so timed that the picking starts before the harness frames have reached. the extreme limit of their movement and this fact makes it necessary to have the box from which the shuttle is to be picked in alignment with the lay before the dobby harness lever has completed its movement. By means of the cam levers shown herein 1 am able to raise the boxes in proper time with the rolls and rest on the dwell portions of the said cam lever for such time as. the harness continues to move after the boxes are in position. Also, the shedding mechanism is usually so designed that it starts and stops with a slow motion and attains a greater motion when the harnesses reach half their throw so that if the boxes were connected to the harness jacks they would be stopped while said jacks were moving at a relatively fast rate of speed. By means of the cams however, I am able to raise and lower the boxes by a motion independent of and different in charactor from the motion of the harness frames. In order to position the notches 57 with respect to their rolls and to vary the angular motion of the cam levers the connectors l7 and 48 may be moved from on-eof the notches 32 to another of said notches but as these notches are not usually concentric with the pivots of the connectors it will be seen that the position of the lower arms A and a6 will be changed for each adjustment of their connectors with respect to the dobby lever. As shown in Fig. 2, for instance, if connector -l7 were to be raised to the upper notch, shaft 42 would receive a slight left hand rotation, the result of which would be to move notch 57 away from Leas es the corresponding roll because of the action of the associated spring 61. In order to take up this extra motion the arm 4.6 would be loosened on its shaft and given a new setting to restore notch 57 to its proper po sition.

From the foregoing it will be seen that l have provided a box motion operated from the pattern mechanism in such a Way as to be independent of a portion of the motion of the harness levers and that any slight discrepancies which might result from adjustments at the harness levers can be compensated for by the arms.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and 1 do not wish to be limited to the details herein disclosed, but what I claim is: V

1. In a loom, shuttle boxes, a box lever to raise and lower the boxes, a roll there on, an angularly movable member having a cam surface, a notch and a dwell, a harness lever, connections between the harness lever and the member, the roll normally being positioned in the notch, said member being movable throughout the whole motion of the harness lever and said roll being engaged by the cam surface during a portion of the movement of the member and engaging the dwell for the remainder of the motion thereof, and means to return the memher as the harness lever moves in the opposite direction to bring the notch into operative relationship with the roll.

2. In a loom, shuttle boxes, a box lever to raise and lower said boxes, an angularly movable cam operatively positioned with respect thereto, a harness lever, connections between the harness lever and the cam, means to adjust the harness lever and a portion of the connections with respect to each other to vary the amount of motion of said portion, and means to vary the setting of another portion of the connections independently of the point of attachment between said connections and the harness lever to adjust the angular setting of the cam.

3. In a loom, shuttle boxes, a box lever to raise and lower the same, a cam operatively positioned with respect thereto, a harness lever, and connections between the her ness lever and the cam, said connections being in two parts, each part being independently adjust-able with respect to the other part, one of said parts being adjustably connected to the harness lever to vary the amount of motion of said part and the other part being connected to the cam to adjust the angular setting thereof.

4. In a loom, shuttle boxes, a box lever to raise and lower the same, a cam having a notch formed therein, a roll on the box lever to be received by the notch, a harness lever, connections between the cam and the harness lever, said connections being in two parts one part adjustably connected to the harness lever to vary the amount of motion of said part and the other part connect-ed to the cam, and an adjustable connection between the parts to vary the angular p0sltion of the cam.

5. In a loom, shuttle boxes, a box lever to raise and lower said boxes, a roll thereon, a cam having a notch positioned to receive the roll, a harness lever, and connections between the harness lever and the cam, said connections including a part adjustable with respect to the harness lever to vary the amount of motion of said part and a second part operatively connected to the cam lever and adjustable with respect to said first named part to vary the angular position of the earn.

6. In a loom, shuttle boxes, a box lever to raise and lower said boxes, a roll thereon, a cam for said lever having a notch to receive said roll, a harness lever, and connections between said harness lever and the cam, said connections including a shaft, a pair of arms adjustably mounted on said shaft, linkage between one of said arms and the cam to vary the angular position of the cam when the arm attached thereto is adjusted and linkage between the other arm and said harness lever and having an adjustable connection with respect to said harness lever to adjust the amount of motion of said other part.

In testimony whereof I have hereunto affixed my signature.

CHARLES A. DIGGINS.

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