US1968073A - Shuttleless loom - Google Patents

Description

July 31, 1934. H. DREYFUS El AL SHUTTLELESS LOOM Filed Nov. 12, 1930 HENRY DREYFUS WILLKAN A- DICKHE FRANK C- Hag I t /WM v ltTBflNIYE eura n1, 1. 1934 v v 1,968,073

NITED STATES PATENT OFFICE- ucao'ii slmmnmss Loom Henry Dreyfus, London, William Klexander Dickie and Frank Corbyn Hale, Spondon, near Derby, England, assignora to Celaneae-Corporation of America, a corporation of Delaware Application November 12, 1930, Serial No. 495,139 In Great Brita-in December 9, 1929 Claims. (Cl. 139l2 6) This invention relates to shuttleless looms, that The length of the weft laid may be somewhat is, looms in which weft is inserted from the stalonger than the width of the fabric, so that a tionary'supply instead of from a shuttle. The short amount of weft projects from the side of invention relates more particularly to the wea the fabric opposite to that at which the weft was 5 ing in shuttleless looms of fabric in which the inserted and this short amount may be turned weft is laid as a single pick, one end of the weft round one or more warp threads on that edge being turned into the fabric to form a selvedge. of the fabric or turned into the succeeding pick, in of the weft may be effected by any suitable means being employed for this purinserting the weft as a double loop, one end 01' pose, 10 which rema ns attached t th pre ding pi k Itwill be understood that it isdesirable for the 65 inserted from the Same s de o the om, and dummy shuttle to introduce weft from both sides by severing the connection of the weft to such of the loo'm in order to obtain the greatest possipreceding pick at some distance inside the edge ble output, and therefore, a. cutting device may be of the fabric when the double loop has been cardisposed at each side of the loom, each cutting ried appr ma y half Way thr h the shed. device being actuated in the manner above de- 7 One limb of the loop is, of course, still connected scribed by the passage of the shuttle in either to the. yarn supply, and the other limb of the direction through'the shed. The same oradifferloop, i. e. theone which has just been severed, out set of contacts may be employed for closing is carried through the remaining part of the shed. the two cutting device circuits. In the case where Previously, this method of weft insertion has been one set of contacts is employed, a switch may be .75 performed by positively actuated means which included in and actuated by each circuit and in some cases'eflect the transfer of the weft loop, closed by mechanism driven by any suitable part half way through the shed to withdrawing means of the loom to provide that only the cutting device also positively actuated to carry the severed limb appropriate to .the side of the loom from which of the loop through the rest of the shed, a cutweft is being supplied is actuated when the ting device being operated by suitable gearing to shuttle completes the circuit through the set of sever the weft on the arrival of the weft-insertcontacts. Alternatively, entirely independent ing means half-way through the shed. circuits may be employed, together, if desired, ii similar mode of weft insertion combined with with means for ensuring the actuation of only one 30 the formation of a tumed-in selvedge is carried cutting device at a time, in the manner described 45 tric contacts may be mounted on the reed or shuta1118111,

out in a shuttleless loom according to the 'invenabove. A further means for securing this result tion in which the weft is introduced into the shed consists in arranging for the cutting devices in by a dummy shuttle, in the form of a loop conturn to be withdrawn completely from operative nected to a previous pick, and the passage of the position d rin th p k in whi h hey r n 35 shuttle through the shed causes the operation of r q ir d to operate, any ui abl mechanism cutting means which sever one end of the weft be n emp yed the PU 'D loop from the preceding pick at the time when One formof loom according to the invention the loop length is just suflicient for the single will now be described with reference to the accompick. Preferably the cutting means are put into p n drawing.-but it s t be understood that 40 operation by the closing of an electric circuit by the follomllg d o p is given by Way of the shuttle at some point in its passage through ampl y an is in n Way limi a ivethe shed,. there being included in the circuit an Fig-1 s a di ma i ront l vati n f the electro-magnet or solenoid operatively connected ay and eed of a m together with a weft sever- "with the cutting means. Anysuitabletypeof elecmechanism n l cal operatin mech- 100 tle race, one or both of the contacts preferably 'Fi 2 s an d elevation of a w ft s v in be ng adjustable in position so that the length of device and mounting and positioning mechanism the pick laid may be regulated. A convenient for the m and. form of contact my be provided by including Fig. 3 is an end elevation of a weft severing one or other desired number of the reed dents device to an increased scale.

in the electric. circuit, the separate dents be ng 4 is a diagrammatic w Showing th of course, insulated from each other. By making my Shuttle n mid-Shed P nconnection with appropriate dents severing of the Fig. 5 is a similar view, after the loop 38 has weft can be made to take place at any desired been severed. and the dummy shuttle has com- 55 time duringvthe passage of the shuttle. pleted its movement through the shed. I10

' plunger is drawn Referring to Figs. 1 and 2, a dummy shuttle weft carrier 5 is provided with a short metal plate 6 on the side next to th reed and is picked across the shuttle race 7 of the loom by any suitable form of picking mechanism (not shown). The metal plate 6 is secured to'a recess in the shuttle wall flush with the surface of the we The shuttle 5 bears lightly against the reed 8 as it passes across the race so that the plate 6 makes sliding contact with the dents 9 on the reed 8. At some distance from each end of the reed a number of reed dents 9 are provided at their upper ends with connecting lugs. The lugs on one side of the dents 9 are coupled to a lead 11 connected to the low tension side of a transformer 12. The lead 11 is also connected to one winding 13 of a double wound solenoid 14 which winding 13 is in turn connected to the other pole of the low tension side of the transformer, or with the secondary low tension current which is always flowing in the winding 13.

A further number of reed dents 9" alternating with the dents 9' are provided at their lower ends with connecting lugs and dents are coupled by a lead 16 to one side'of the second winding 17 of the solenoid 14, andthe otherend of the winding 1'7 is, connected to the second pole of the low tension side of the transformer, Current can always flow in the winding 1'1 by contact being established between the alternating sets of dents 9' and 9" by the passage of the shuttle across the reed. I

A separate circuit for the second sets of dents 9', 3" may be provided by the leads 110, 160 in parallel with the,circuit of the first sets or the lugs of the second sets of dents may be coupled directly to the leads 11, 16 of the first set.

Closure of the circuit the lugs of one side of through the winding 1'7 by passage of the shuttle across the race, operates the plunger 15 of the solenoid 14 to close the circuit of the two solenoids 20 which are connected in parallel to the leads 18, 19 on the transformer 12. A spring arm 22, carried bgf'a contact block 21 and having a contact 23 adapted to engage a block-24 in the main lead of the solenoid circuits, is operated through a lever 25 by movement of the plunger 15. The two windings 13 and 1'! of the solenoid 14 are wound in opposite directions so that when current is passed through both on the closure of the circuit the solenoid 14'is deenergized and the plunger 15 is free to move to allow the spring loaded arm 22 to rise and close the circuits of the solenoids 20. When the shuttle has passed the contact on the reed only the winding 13 on the solenoid 12 is operative, so that the inwards to causethe lever 25 to move the arm 22to the other position and reopen the .circuits of the solenoids 20.

Closure of the circuits passing through the solenoids 26 operates weft severing devices as will now be described.

Each weft severing device comprises a moving knife blade 28 pivotally mounted on a fixed blade 29, and carried by. a reciprocating member 30 which s ides in a bracket attached to the frame of the loom, and the reciprocation of the members 30 is effected in suclra manner that one of the severing devices passes between the warps near to oneside of the fabric to engage a weft thread which has been inserted by theshuttle -5 from that side of the fabric. j

The eciprocating motion of each member 30 is obtained from a cam 31 on the half time shaft of the loom, which cam 31 bears against a cam bowl 34 on a spring-loaded pivotally mounted arm 35 which is connected to the lower end of the sliding member 30. On the passage of a severing device between the warps, the knife blade 28 is retained in the open position by means of a spring 32, so that the severing device engages the weft thread but allows it to pass there-through until severance is to be effected.

' When the member 30 has beenraised to its highest position, an abutment 27 at the lower end of the pivotally mounted blade 28 is opposite the plunger 26 of the solenoid 20, so that outward movement of" this plunger on closure of the solenoid circuit causes it to engage the abutment 2'7 and close the blade'28 against the fixed blade 29.

Referring now to Fig. 2 the full lines show the knife 28 open and the arm 35 in its lower position, and the dotted lines show the knife closed and raised to its upper position. Fig. 3 shows the severing device to a greater scale with the knife 28 open and the device at its lower position. The

cam 31 is provided with a steep lift to pass the severing device quickly between the warps. The severing device is withdrawn quickly after cutting of the weft so as to beat-up.

It will be understood that while both solenoids are energized simultaneouslyv by closure of the circuit of the solenoid 14 through the reed dents 9', 9", only one of the severing devices is in operative position at any one time. The actual time at which severing of the weft takes place is determined by the distance of the dents 9', 9" included in the circuit from the ends of the reed. Thus, on insertion from the left-hand side of the loom, cutting takes place when across the left-hand sets versa. v

The operation of the apparatus will now be described with reference to Figs. 4 and 5.

of dents 9', 9" or vice contact is established Weft is supplied from bobbins 36 situated at each side of the loormand is presented to the path of the dummy shuttle 5 so as to be carried into the shed in the form of a loop 38, which is shown proceeding from the left hand bobbin 36 in Fig. 4. The loop 38 is connected to the previous pick of weft 3'7 which has been inserted from that side of the 100th and has been followed by a pick from the other side.

In Fig. 5 the loop 38 has been severed from the previous pick 3'7, and has been carried through the shed by the passage of the shuttle 5. It will be seen that a small length of weft is left in the shed extending. from the edge of the fabric to the point of severing, and that this short length of weft will be beaten up with the length of weft now extending across the shed from the bobbin 36.

In each figure a portion illustrated which shows clearly the manner in which the picks of weft. are laid, and secured in the selvedge.

ofthe woven fabric is 7 What we claim and desire to secure by Letters shuttle in the form of a preceding pick, said 1 0m severing weft inserted by loom in which weft is inserted tie has reached a length from the point of severance suflicient to complete the pick.

2. A shuttleiess loom in which weft is inserted in the shed by a dummy shuttle in the form of a loop connected to a preceding pick, said loom comprising electrically-operated means for severing weft inserted by the dummy shuttle and control means on the loom reed in connection with said severing means, said control means being adapted for engagement by the dummy shuttle on its passage across the reed so as to efiect closure of the severing means circuit when the weft loop has reached a length from the point of severance sufficient to complete the pick.

3. A shuttleiess loom in which weft is introduced into the shed by a dummy shuttle in the form of a loop connected to a preceding pick, said loom comprising electrically-operated means for severing weft inserted by the dummy shuttle, electrical contacts on the. loom reed, a low-tension circuit including said contacts, means 'on said shuttle adapted to connect said reed contacts together in the passage of the shuttle across the reed, and a high-tension circuit operated by said low-tension circuit adapted to actuate said weft-severingmeans on connection of said re'ed contacts so that the weft is severed from-the preceding pick when the loop has reacheda length from the point of severance suflicient to complete the pick.

4. A shuttleless loom in which weft is inserted in the shed by a dummy shuttle in the form of a loop connected to a preceding pick, said loom comprising weft-severing means arranged at a point some distance inside the edge of the fabric adapted to sever weft inserted by the dummy shuttle,-

loop connected to a preceding pick, said loom 7 comprising weft-severing means arranged at each side of the loom adapted to sever weft inserted by the dummy'shuttle, control means on the loom reed in connection with said severing means, said control means on the reed being adapted to .be engaged by the dummy shuttle in its passage across the reed from either side of the loom, the construction and arrangement being such that engagement of the dummy shuttle therewith causes actuation of the severing means-when the a loop drawn by the dummy shuttle has reached a length from the point of severance suflicient to complete the pick.

HENRY DREYFUS. WILLIAM ALEXANDER DICKIE.

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