US1953921A

US1953921A - Dagger for looms

Info

Publication number: US1953921A
Application number: US506420A
Authority: US
Inventors: John M Bolt
Original assignee: BAHAN TEXTILE MACHINERY COMPAN
Current assignee: BAHAN TEXTILE MACHINERY Co; BAHAN TEXTILE MACHINERY COMPAN
Priority date: 1931-01-03
Filing date: 1931-01-03
Publication date: 1934-04-10
Anticipated expiration: 1951-04-10

Description

April 10, 1934. J, M, BOLT 1,953,921

DAGGER FOR LQOMS Original Filed Jan. 3. 1931 INVENTOR.

A TTORNEY.

Ell

Patented Apr. I i}, 1934 DAGGER FOR LOOMS John M. Bolt, Cordova,

Textile Machinery Co a corporation of Sout N. 0., assigncr to Bahan mpany, Greenville, S. (3., h Carolina Application January 3, 1931, Serial No. 506,420 Renewed September 5, 1933 1 Claim.

This invention relates to an improved dagger for looms and more especially for looms of the automatic type which have a revolving filling feeder from which a new bobbin is inserted into theshuttle and the old bobbin is ejected from the shuttle when the supply of yarn thereon has become exhausted or a break occurs in the yarn, and an object of the invention is to provide a dagger so designed as to insure the operation of the replenishing mechanism and removal of the thread parts-r from the path of the filling at each time the thread may become exhausted on a bobbin in the shuttle or a thread breaks on the bobbin whereby the feeler mechanism is brought into action to cause a new bobbin to be transferred from the revolving filling feeder into the shuttle.

Heretofore, due to design and shape of the dagger, it has resulted that at times the thread parter would not be entirely moved from the path of the filling, thereby cutting the filling and making mis-picks in the cioth, and the improved dagger shown and described has a face portion adapted to insure pushing of the bunter far enough on the second operation of the lay of the loom in case it is not pushed far enough on the first operation to entirely remove the thread parter out of the path of the lay, as it sometimes happens that when the hunter is pushed by the dagger that it does not push it far enough to entirely remove the thread parter out of the path of the filling on the first stroke and due to the steep inclination of the conventional dagger, the hunter will not be engaged by the dagger on the secondand subsequent strokes or swings of the lay of the loom.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawing, in which- Figure 1 is an end view partly in cross-section of a loom equipped with a revolving feeling feeder and showing the bobbin changing mechanism.

Figure 2 is a side elevation of the improved dagger;

Figure 3 is an end view of Figure 2, looking from the right hand end of Figure 2;

Figure 4 is a modified form of Figure 2 show ing a shell around the end of the dagger;

Figure 5 is an end view of Figure 4.

Referring more particularly to the drawing, the numeral indicates the frame work of a conventional loom which has a conventional filling feeder 11 which is equipped with a plurality of bobbins 12, said loom having a lay 13 adapted to carrya shuttle 14 and in this shuttle a bobbin 15 is adapted to be held. A transferer 16 is pivoted as at 17 and has a downwardly extending bell-crank lever 18 associated therewith which is pivoted as at 19 to a hunter 20 which latch finger is adapted at times to engage the dagger 20a secured to the side of the lay of the loom. A rock shaft arm 21 is shown in engagement with the shuttle feeler 22 to raise the hunter to operative position as shown in Figure 1. In normal positicn when a change of bobbin is not necessary bunter 20 will be in lowered position and not in position to engage dagger 20a.

A latch lifter 23 is connected to shuttle feeler 22 and also connected to latch finger by means of a projection on the b nter sliding in a slot in latch lifter 23.

In operation the mechanism shown in Figure 1 is in the act of transferring a bobbin "from the filling feeder into the shuttle and the parts are in the position this action is taking place, which is brought about by the rock shaft arm 21 depressing shuttle feeler 22 to raise bunter to elevated position to cause the dagger to engage said hunter and this dagger being pivotally connected to member 18 which is integral with member 16 causes the lower end of member 18 to be pushed backwardiy to cause member 16 to swing downwardly to push a bobbin from the filling feeder into the shuttle and to eject the empty bobbin out of the shuttle and to cause the bobbin deflector 25 to guide the empty bobbin into a suitable container which is not shown.

Heretofore, in daggers which have been universally used, the angle of receding inclination from the top of the dagger to the bottom thereof has been approximately degrees so that when the lay of the loom in its reciprocating motion strikes against the hunter it should swing the hunter downwardly on its pivot 19 and forwardly far enough to remove the filling knife out of the path of the filling, but on account of the fact that there has been a very great distance between the upper tip of the free end of the hunter and the lower portion of the inclined surface of the dagger after the latch finger has been operated by the dagger, it sometimes happens that when the bunter is not pushed far enough to remove the filling knife from the path of the filling that the thread parter will cut the filling and by having the angle on the dagger less than 40 degrees and by extending the bottom portion of the dagger further down it will cause this bottom portion of the dagger to strike the upper tip of the bunter on the second swing of the lay after the transferring shown in Figure 1 while operation has begun and this will push the hunter further back and will remove the thread parter out of the path of the filling. It is an object of this invention to overcome this defect by providing a dagger in which the inclined receding angle of the face of the dagger is less than 45 degrees or approximately a 30 degree angle from the vertical and also to have the face of the dagger extend further downward. In conventional hunters this angle has been approximately 45 degrees, thus allowing a great amount of space between the lower free end of the hunter and the lower surface of the dagger so as to cause the dagger to fail to engage the hunter on the second swing of the lay to push the hunter all the way back to entirely remove the thread parter from the path of the filling.

In Figure 2 the hunter 28 is shown and likewise in Figure 3, and it is there seen that the portion a of the face of the dagger is adapted to engage the upper portion of the hunter on the first swing of the lay when a bobbin is being changed, and by observation it will be noted that the point b on the lower part of the dagger is much further advanced to the left and projects further downward than in the conventional dagger which has heretofore been used. By dropping a vertical line from the point a it will be seen that this vertical line in combination with a straight line from the point a to point D will form an angle of approximately 30 degrees, whereas, in the conventional dagger this angle would amount to approximately 45 degrees which would cause the upper end of the hunter to fail to strike against the face of the dagger at the lower surface thereof on the second swing of the lay after the transfer of bobbins has begun.

In Figures 4 and 5 a modified form of the invention is shown in which a sleeve 2'? is adapted to be fitted over the dagger by cutting down the portion 28 of the dagger so as to allow this sleeve to slip thereover and this sleeve can be shrunk on the portion 28 or a screw 29 can be threadably embedded in the portion 28 and overlapped onto the inner portions of the member 27 by causing a hole to be milled out in the end of the dagger and also in the inside portion of the member 27 so that this screw 29 will hold the member 2'7 in position, provided it is not shrunk thereon, but if it should be shrunk thereon then this screw would not be necessary.

By providing the shell 27 it is seen that should the surface of the dagger become worn that a new shell can be readily inserted thereon without the necessity of applying an entirely new dagger to the lay of the loom.

It is thus seen that by providing a dagger having a surface of the proper angle that uniform operation of the transferer is always assured and complete removal of the thread parter from the path of the filling is assured for portion b will be engaged by the upper tip of the hunter on the second swing of the lay to force the hunter back to proper position and, thereby removes the thread parter from the path of the filling.

In the drawing and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth in the appended claims:

I claim:

A loom dagger adapted to be rigidly secured to the lay of the loom and having its outer upper surface which is farthest removed from the lay receding downwardly and inwardly toward the lay for a short distance and said surface then receding toward the lay at a more acute angle than the preceding surface and then having the remaining portion of said surface receding toward the lay at a less acute angle than the immediately preceding surface, all of said angles being with relation to the vertical.

JOHN M. BOLT.