US2084550A

US2084550A - Loom stopping mechanism

Info

Publication number: US2084550A
Application number: US118593A
Authority: US
Inventors: Carl D Brown
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1936-12-31
Filing date: 1936-12-31
Publication date: 1937-06-22
Anticipated expiration: 1954-06-22

Description

June 22, 1937. D, sRwN 2,084,550

LOOM STOPPING MECHANISM Filed Dec. 51, 1936 INVENTOR. CAEL 0. Bean/N.

ATTORNEY.

Patented June 22, 1937 UNITED STATES PATENT OFFICE LOOM STOPPING MECHANISM ration of Maine Application" December 31, 1936, Serial No. 118,593

14 Claims.

The present invention pertains to fly shuttle looms and more particularly to mechanism for effecting loom stoppage upon failure of the shuttle to properly complete its flight across the 6' loom.

In looms of the type to which my invention pertains, a reciprocating lay carries a shuttle box adapted to receive the shuttle when the latter has properly completed its flight across the loom. 10 Loom stopping mechanism, commonly called protection mechanism, is controlled by means which determines the presence or absence of the shuttle in the shuttle box at a predetermined point in the cycle of movement of the lay. Prior 1 to the present invention, the most commonly used protection mechanism was of the protector-rod type and this mechanism was controlled by the well-known binder in the shuttle box. The binder is thus required to perform two functions, l. e. the checking of the shuttle and the controlling of the protection mechanism. Where the binder is properly shaped to most efficiently check the shuttle, operation of the protection mechanism begins a little earlier in the loom J2 cycle than is desirable and is not always fast enough to cause the daggers toproperly clear the frogs. Furthermore, the ,pressure of the protection mechanism on the binder causes the latter to frictionally resist the picking of the o shuttle out of the shuttle box.

It is the principal object of the present invention to provide a loom having a reciprocating lay, a shuttle box and suitable protection mechanism as aforesaid, and means for operating the pro- 4 5 tection mechanism comprising a lever pivoted to the lay and a cam projecting into the shuttle box i and operated by an incoming shuttle for moving such lever, such cam to operate the protection mechanism independently of such shuttle check- -".40 ing mechanism as may be provided.

The preferred embodiment of the invention includes the aforementioned well-known protector rod type of protection mechanism and a lever for operating the same extends longitudinally of the shuttle box and is pivoted to the shuttle box at its outer end. The inner end of the lever is free and is engaged by the protector rod finger. A lever-operating cam is pivoted in one wall of the shuttle box and projects into the shuttle box in position to be rotated by frictional engagement with an incoming shuttle. The preferred cam is so shaped as to offer very little resistance to the picking of the shuttle out of the shuttle box, and is also arranged to be automatically rotated to shuttle receiving position by pressure derived from the protector rod finger.

The above mentioned and other objects of the invention are accomplished by the construction shown on the drawing, of which:

Fig. l is a view, partly in elevation and partly in section on line l| of Fig. 2, of a loom having the said preferred embodiment of my invention applied thereto;

Fig. 2 is a plan view of part of the mechanism shown on Fig. 1;

Fig. 3 is a View of the same in rear elevation; and

Fig. 4 is a fragmentary plan view showing the position of certain parts when the shuttle is absent from the shuttle box.

The loom shown on the drawing includes conventional mechanisms which form no part of the present invention and which are accordingly not illustrated. However, of the conventional parts of the loom I have shown a part of a right hand loom side I which comprises part of the loom frame, a sword 2 carrying a lay beam 3, a pitman 4 by which the lay is reciprocated, a picker stick 5 for picking the usual shuttle 6, and a shipper or controlling handle 1, all of which are well-known in the art. The particular protection mechanism shown is also old in that it includes the usual protector rod 8 carrying a dagger 9 for engagement with a frog ID for stopping the loom, the protection rod being biased to loom-stopping position (counterclockwise, Fig. l) by a spring, not shown, and being moved to loom-running position by a novel means which operates the protector rod finger il.

The lay has a shuttle box at each end for receiving the shuttle and from which the shuttle is picked by the picker sticks. The drawing shows only one such shuttle box, the other box being of the same or any suitable construction. The shuttle box shown includes a front box plate I2 which is fixed to the lay and a back box plate 13 having its outer end fixed to the lay by a bolt 14 and its inner end fixed to the sword 2. A top plate [6 of the shuttle box in carried by the back box plate.

The particular protector rod finger H, which is fixed to the protector rod 8, extends upwardly in back of the lay. The form of means shown on the drawing for operating the protection mechanism is accordingly positioned at the back of the lay and includes a lever ll. This lever is pivoted at its outer end to the lay, it being mounted on a pin l8 which is fixed in a vertical position in the back box plate I3. The lever H exmovement of the lever about its pivot l8.

, Ihe lever H is not directly engaged by the ,shuttle, but its operative position is controlled by a member 19 which is interposed between the lever and the path of the shuttle. The particular form of member I 9 shown is in the form of a cam pivoted to the lay by being mounted on a vertical pin 20 in the back wall of the shuttle box. The cam has a surface 2| which engages the lever H at a point intermediate the ends thereof, for moving the lever and protector rod finger rear- Wardly when the cam is rotated.

The cam i9 is also provided with a cam surface 22 which, as shown more clearly by Fig. 4, projects into the shuttle box in position to be engaged by an incoming shuttle. It will be apparent that as the shuttle 6 strikes. the surface 22 in entering into the shuttle box, the cam I9 will be rotated in a counterclockwise direction, Fig. 4. Upon such rotation of the cam the surface 2! moves the lever I! rearwardly, thereby moving the finger ll rearwardly and raising the dagger 9 above the frog I0.

An important feature of the cam 39 shown on the drawing is that the cam is so shaped that when the shuttle is in the box substantially all of the pressure from the finger l l on the lever i! is transmitted to the pivot pin 29 rather than to the shuttle. This condition exists because the parts are so arranged that when the shuttle is in the box the pivot pin 20 and the point of contact between the cam and lever are in alignment transversely of the lay and shuttle box at an acute angle thereto, which angle is preferably nearly but not quite a right angle. Thus, the cam offers very little resistance to the picking of the shuttle out of the shuttle box.

A further important feature of the particular c am l9 shown is that the cam surface 2! is so shaped that pressure of the lever I'I thereon rotates the cam clockwise from the position of Fig. 2 to the position of Fig. 4 when the shuttle is absent from the shuttle box. Thus, the resetting of the cam to shuttle receiving position is accomplished without the use of any springs other than the usual protector rod spring (not shown) which causes the finger II to press on the lever l! as above mentioned.

The location of the cam I9 and its pivot 2i? intermediate the ends of the lever H is of advantage in that a comparatively small movement of the cam is multiplied at the inner end of the lever, to thereby produce a relatively greater movement of the protector rod finger. Such location of the cam also results in the non-engagement of the dagger 9 with the frog I0 being determined only after the shuttle has entered into the shuttle box far enough to be entirely clear of the warp. Operation of the-dagger by the cam means results in a very rapid movement of the dagger and thus insures that the dagger will properly clear the frog when stopping of the loom is not to be eifected. V

The means for operating the protection mechanism, as above described, exerts little checking action on the shuttle and it is accordingly necessary to provide other means for this purpose. The present invention deals only with the protection mechanism and operating means therefor and does not include means for checking the shuttle. The drawing does show, however, a shuttle checking means which may be employed if so desired. As shown, the shuttle checking means comprises

fibre plungers

23, 23 loosely positioned in the back box plate and urged forwardly by a spring 24 which bears against a plate 25 connecting the plungers together. A member 26, fixed to the back box plate, is provided with an inclined shuttle engaging surface for positively limiting movement of the shuttle towardthe picker stick.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. In a fiy shuttle loom, the combination of a lay having a shuttle box, protection mechanism including a protector rod finger, a lever pivoted to the lay for operating said finger, and a. cam operating said lever, said cam being pivotally mounted on the lay and projecting into the shuttle box in position to be. engagedand rotated by an incoming shuttle.

2. In a fly shuttle loom, the combination of a lay having a shuttlebox, protection mechanism including a protector rod finger, a lever pivoted at one end to thetlay and engaging said finger for operating'the' latter, and acam pivotally mounted on the lay and engaging and operating said lever, said cam projecting into the shuttle box in position to be engaged and rotated by an incoming shuttle.v

3. In a fly shuttleloom, the combination of a lay having a shuttle box, a lever pivoted-at one end to the lay and having its other en'd free, protection mechanism including a fingerengtaging and operated by the free end of said lever, and a cam engaging said lever intermediate the ends of the latter, said cam beingpivoted to the lay and projecting into the shuttle" box in position to be engaged and rotated by an incoming shuttle.

4. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted at its outer end to the lay and having its inner end free, protection mechanism including a. finger g engaging and operated by the innerend of said lever, and a cain'engaging and operating said lever, said cam being pivoted to the lay on a ver tical axis intermediate the ends. of said lever,

said cam projecting into the'shiuttle box in posi- 1 tion to be rotated by engagement with an incoming shuttle.

5. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted at its outer end to o-ne'wall of the shuttle box, said lever extending lengthwise of the shuttle'bo-x and its inner end being free, protection mechanism including a protector rod finger engaging and operated by the inner free end of said lever, and

a cam pivoted in said wall of the shuttle box intermediate the ends of said lever, said cam engaging said lever for operating the latter, .said cam projecting into the'shuttle box in position to be rotatedby engagement with an incoming shuttle. V

6. In a fiy shuttle loom, the combination of a lay having a shuttlebox, a lever pivoted at its outer end to one wall of the shuttle box, said lever extending lengthwise of the shuttle box and its inner end being free, protection mechanism operated by the inner end of said lever, and a member pivoted in said wall'of the shuttle box intermediate the ends of said lever, said member engaging said lever for controlling the operative position thereof, said member projecting-into the shuttle box in position to be rotated by engagement with an incoming shuttle.

7. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted at one end to the lay and having its other end free, protection mechanism operated by the free end of said lever, and a member pivoted to the lay intermediate the ends of said lever, said member having a portion engaging said lever and moving the same when the member is rotated, said member projecting into the shuttle box in position to be engaged and rotated by an incoming shuttle.

8. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted to the lay and extending generally longitudinally thereof, protection mechanism including a finger pressing against and operated by said lever, and a cam pivoted to the lay and engaging said lever for operating the latter, said cam projecting into said shuttle box in position tobe engaged and rotated by an incoming shuttle, the pivot of said cam and the point of engagement of the cam with said lever being in alignment transversely of the lay at an acute angle thereto when a shuttle is in the shuttle box, to thereby relieve the shuttle of pressure transmitted by said finger.

9. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted at one end to the lay and having its other end free, protection mechanism including a finger pressing against and operated by the free end of said lever, and a cam pivoted to the lay and engaging said lever for operating the latter, said cam projecting into said shuttle box in position to be engaged and rotated by an incoming shuttle, the relative positions of the pivot of the cam and the point of engagement of the cam with said lever being such that when a shuttle is in the shuttle box substantially all of the pressure of said finger on said lever is transmitted to said pivot rather than to the shuttle.

10. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted to the lay, protection mechanism including a finger pressing against and operated by said lever, and a cam pivoted to the lay and having a surface engaging said lever and operating the latter when the cam is rotated, said cam projecting into the shuttle box in position to be engaged and rotated by an incoming shuttle, said lever engaging surface and the pivot of the cam being in alignment nearly but not quite at a right angle to said lever when the cam is rotated as aforesaid.

11. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted to the lay, protection mechanism including a finger pressing against and operated by said lever, and

a cam pivoted to the lay and engaging said lever for operating the latter, said cam projecting into saidshuttle box in position to be engaged and rotated in one direction by an incoming shuttle, the shape of said'cam being such that the cam is rotated in the opposite direction by pressure of said finger on said lever when the shuttle is absent from the shuttle box.

12. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever extending longitudinally of the shuttle box and having its outer end pivoted to the lay, the inner end of said lever being free, protection mechanism including a finger pressing against and operated by the inner end of said lever, and a cam pivotally mounted in one wall of said shuttle box intermediate the ends of said lever, said cam being constructed and arranged to be rotated in one direction by an incoming shuttle to thereby operate said lever and to be rotated in the opposite direction by pressure of said finger on said lever when the shuttle is absent from the box.

13. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever pivoted to the lay, protection mechanism including a finger pressing against and operated by said lever, and a cam pivoted to the lay and projecting into said shuttle box in position to be engaged and rotated in one direction by an incoming shuttle, said cam having a surface engaging said lever and moving the latter when the cam is rotated in said direction, said surface and the pivot of said cam being in alignment at an acute angle to said lever when a shuttle is in the shuttle box and the shape of said surface being such that the cam is rotated in the opposite direction by pressure of said finger on said lever when no shuttle is present in the shuttle box.

14. In a fly shuttle loom, the combination of a lay having a shuttle box, a lever extending longitudinally of the shuttle box and having its outer end pivoted to the lay, the inner end of said lever being free, protection mechanism including a finger pressing against and operated by the inner end of said lever, and a. cam pivotally mounted in one wall of said shuttle box and projecting into the shuttle box in position to be engaged and rotated in one direction by an incoming shuttle, said cam having a surface engaging and moving said lever when the cam is rotated in said direction, said cam being constructed and arranged sothat said surface and the pivot of the cam are in alignment at an acute angle to the lay when a shuttle is in the shuttle box and the cam is rotated opposite to said direction by pressure of said lever on the cam when no shuttle is present in the shuttle box.

CARL D. BROWN.