US2075668A - Loom attachment - Google Patents

Description

March 30, 1937.

| N. SILVER 2,075,668

LOOM ATTACHMENT 2 Sheets-Sheet 1 Filed May 15, 1956 INVENTOR. L.N.SILVER.

ATTORNE March 30, 1937. L. N. SILVER LOOM ATTACHMENT Filed May 15, 1936 2 Sheets-Sheet 2 FIG.5

FlG.7

A TTL RNEY.

Patented Mar. 30, 1937 UNITED STATES PATENT OFFICE LOOM ATTACHMENT Application May 15, 1936, Serial No. 79,991

1 Claim.

Generically, this invention relates to looms but it more specifically relates to the so called smash protection mechanism of a loom.

In known types of looms it is customary to pro- 5 vide a dagger or daggers which are mounted on a protector rod journaled in bearings on the lay of the loom. Spring means of any suitable form are usually associated with this protector rod and so disposed with respect thereto and to the lay of the loom that they always urge the dagger or daggers in a direction which will cause them to come in contact with the steels in the frogs or with other members adapted to stop the motion of the lay. Sincethe spring means just referred to always tend to throw the daggers into engagement with the steels, it is essential that as long as the loom is operating in a normal manner that means be provided to prevent such engagement, otherwise the lay would be arrested by such engage- 2 ment at every beat.

protector rod, thus rotating said protector rod against the action of the spring means aforementioned. In this manner the load on the spring means is carried directly by the shuttle, the binder finger, the shuttle box, and associated parts and the daggers are thus prevented from striking the steels in the frogs and stopping the loom. In case, however, the shuttle should fail to enter either box it will be seen that there will be nothing to prevent the spring means aforementioned from rotating the protector rod and the dagger or daggers attached thereto into the position of protec- ,tion thus stopping the lay and preventing a so called smash or breakout.

It will also be obvious and, in fact, has long been obvious to those skilled in the art that the conventional form of mechanism which has just been"de- Furthermore in order to overpower the action of the protector rod spring it'is necessary for the shuttle to move into and out of a so called tight box thus causing a large increase in power consumption not to mention the excessive wear re- ,55 sulting from the tight contact between fast moving unlubricated parts, i. e. the shuttle, the shuttle box, and the binder. In fact the power loss due to the present form of operation is so high that even the simple mechanism which forms the subect matter of this application and which acts so as to carry the spring load above referred to and allow the shuttle to enter and leave a loose box, consistently shows a power saving of over nine per cent (9.0%).

The invention which forms the subject matter of this application is designed to relieve the shuttle of practically all of the spring load above referred to and allow it to enter and leave aloose box and also, when properly adjusted, the invention either entirely prevents or materially reduces the motion of the daggers, the protector rod, the binder, the binder finger, and associated parts thus further reducing power losses. as well as wear and tear on said parts. Although the invention, which may incidently be attached to any conven tional form of loom or made an integral part of a loom, does prevent or reduce the motion of the various parts of the loom just referred to and also relieves the shuttle of all spring load except during that portion of the beat when the shuttle is idle and in stationary position, as will be hereinafter explained, it should not be assumed that failure of the shuttle to enter either box will not instantly allow the spring means aforementioned to rotate thedaggers into the position of protection thus stopping the lay and preventing a smash.

Referring now to the drawings which form a part of this application and in which like characters of reference refer to like parts throughout the several views.

Fig. 1 is a broken away perspective view of the preferred embodiment of the invention showing a portion of the protector rod and associated units of a conventional form of loom and showing the invention which forms the subject matter of thisapplication in place thereon.

Fig. 2 is a sectional elevation of the preferred embodiment of the invention in place on a loom. This section is taken along the line 2-2 of Fig. 1. In this View the position of the daggers and associated parts when the shuttle fails to enter the box and when the lay is in the forward position is indicated by the dotted lines.

Fig. 3 is a sectional elevation of the preferred embodiment of the invention in place on a loom. This section is taken along the same lines as those indicated in Fig. 2. In this view the lay is shown in its forward position but with the shuttle in the box and with the daggers clear of the steels.

Fig. 4 is a side view of the preferred embodiment of the invention showing in this case the form which the pitman arm fitting must have in order to clear certain parts of the lay.

Fig. 5 is a front View of the special form of pitman arm fitting which is shown in side View in Fig. 4.

Fig. 6 is a diagram which shows the motion of the end of the pitman arm fitting with respect to the lay during one beat of the lay. This diagram is included in order that the operation of the device may be more readily understood.

Fig. '7 is a side view of a further modified form of the invention showing in this case a roller on the end of the protector rod fitting.

Throughout the several views only so much of the loom is shown as will enable one skilled in the art to imderstand the location and operation of the invention.

Referring now to the characters of reference (I) refers to the lay of the loom, (2) to the protector rod, (3) to the protector rod spring, (4) to the pitman arm, (5) to the sword, ((5) to the dagger, ('I) to the shuttle box, (8) to the shuttle box binder, (9) to the binder finger, (ID) to the picker stick, and (H) to the side frame of the loom. The frog which is adapted to be struck by the dagger whenever the shuttle is not in its box is indicated by the numeral (|2). The crank arm which actuates the lay is indicated by (l3) the bearing which supports the pitman arm is indicated by (M), and the collar which receives one end of the protector rod spring and which is fastened onto the protector rod is indicated by the numeral (l5). The pitman arm is mounted in the forked yoke (l6), which is attached to the back of the lay (I) just above sword (5), by means of the pin (II) which is mounted in the bearings (I l). The various parts which have just been referred to and indicated by the numerals from to I! inclusive are conventional in every respect both as regards their construction and location, but not in all cases as regards their mode of operation as will be hereinafter explained. Mounted on the pitman arm (4) and attached thereto by a bolt or other suitable fitting (l8) which is preferably so disposed as to permit a longitudinal adjustment is an arm or lever (l9). When used on the conventional form of loom it is usually necessary to bend, form, or otherwise displace the forward portion of this lever as shown in Figs. 4 and 5 so that it will pass to one side of the forked yoke (l6) which is mounted on the back of the lay and adapted to receive the forward end of the pitman arm. It is also desirable, although not always essential, to so form the member (l9) that its forward portion is located at a lower level than the top surface of the pitman arm to which it is attached. In the preferred embodiment of the invention as illustrated in Figs. 1, 2, 3, 4, and 5, the forward end of the member (:9) is supplied with a pin (20) upon which a roller (2|) is mounted in any suitable manner, the pin (26) is so disposed that its axis is forward of the axis of the pin (H) which supports the forward end of the pitman arm.

The operation of the invention can be best understood by referring to Figs. 2, 3, and 6. In these figures it will be seen that during that portion of the stroke when the crank arm is in the first and second quadrants, i. e. above the horizontal, and the lay is moving backward, that the roller (2| will be in its lowest position since it is mounted ahead of the pitman arm pivot axis When the roller (2|) is in its low position it will press down on the protector rod contact fitting (22), which is an important unit of the invention and thus will carry the load of the spring (3). When the load of the spring (3) is carried by the contact member (22), the special extension lever (l9) the pitman arm (4), and its associated fittings, in this manner, it will be obvious that the binder finger (9) and the binder (8) will be relieved of all load and the shuttle which normally picks during this phase of the loom cycle can enter and leave a so called free box. During the extreme forward portion of the stroke, however, when the crank (i3) is just leaving quadrant} and passing into quadrant 3 and also during the entire forward stroke the roller (2|) will be elevated slightly which will allow the spring (3) to rotate the protector rod (2) and press the binder finger (9) against the binder (8). During this phase of the cycle the load of the spring (3) will be carried by the shuttle (23), the binder (8), and the side of the shuttle box (24), as will be seen be reference to Fig. 3. If the shuttle should, however, for any reason fail to be in its box during this phase of the loom cycle, a condition illustrated by the dotted outline shown in Fig. 2, then the spring (3) will be unsupported and will rotate the protector rod (2) through a small angle thus depressing the dagger (6) which will strike the frog (l2) and stop the loom through the medium of the conventional smash protection mechanism (not shown).

In actual practise it is usually desirable to form a special contour on the surface of the contact fitting (22) thus improving the operation of the invention and prolonging the life of the various parts. It will be obvious to those skilled in the loom art that the roller (2|) could be mounted on the contact fitting (22) without affecting the operation or departing from the spirit of the invention in any way, and such a form of construction is illustrated in Fig. 7. In fact by suitably shaping the parts (l9) and (22) the roller (2|) can be dispensed with entirely and such a form of construction was actually used during the early stages of the development of the invention. In this case, however, a certain amount of sliding friction is bound to occur even when the parts (I 9) and (22) are very carefully shaped and for this reason the entire omission of the roller is not recommended.

It will be seen from the foregoing disclosure that I have invented a simple and practical device which will materially reduce the wear and pressure on certain of the major units of a loom and will also reduce the power required to operate the loom. Having therefore fully disclosed my invention and the best mode of putting it into practise, I claim broadly as follows:

In combination with the lay of a loom, a shuttle, a shuttle box, a dagger, and frogs adapted to be struck by the dagger to stop the lay, a binder and a binder finger, a protector rod and a protector rod spring, adapted to operate said binder finger and said dagger, a pitman arm pivoted to said lay and a crank to impart to said lay, by means of said pitman arm, a fore and aft motion, means for holding the binder finger clear of the binder, against the action of the protector rod spring, during the time that the shuttle is in motion across the lay but not during the forward stroke of the lay, means adapted to allow the protector rod spring to move the dagger into engagement with the frog for stopping the lay in case a shuttle should fail to be properly boxed, said means comprising an extension arm, mounted on the pitman arm, a contact member mounted on the protector rod and so disposed with respect thereto that during a portion of the backward stroke of the lay the end of the pitman arm extension member will depress the contact arm against the action of the protector rod spring thereby relieving the binder finger, the binder, and the shuttle of the load of the protector rod spring and allowing the shuttle to enter and leave a free box.

LINCOLN N. SILVER.

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