US1883370A - Loom attachment - Google Patents

Description

Oct. 18, 1932. Q HARGREAVES 1,883,370

LOOM ATTACHMENT Filed Jan. 22. 1929 INVEN'I OR Clifford Hargreaves BY g iTTORNEYS Patented Oct. 18, 1 932 UNITED sTArEsPArENr OFFICE crrrronn HARGREAVES, or DRUMMONDVILIQE, QUEBEC, CANADA, Assrsnon r0 CELANESE CORPORATION or AMERICA, A CORPORATION or DEL WAR I LOOM ArrAcHmENr i Application filed January 22,1929. Serial No. 334,184.

This invention relates to an improvement in looms, and particularly dobby looms, wherein the number of bars in'the pattern chain may be materially reduced when fabrics having .a weft of different k nds of yarns are to be woven An object of my invention is to provide an attachment for looms, whereby the number of bars on the pattern chain of the loom may be'materially reduced.

Another object of my invention is toprovide an auxiliary cylinder in a dobby loom, which cylinder actu ates the shuttle changing mechanism, and which in turn is controlled by the pattern chain of the main dobby cylin der. Other objects of my invention will appear fromthe following detailed description.

In the. ordinary dobby attachment a loom, a, pattern :chain is provided, which chain has a series ofbars having pegs for controllingthe raising and lowering of the shaftsof the harness for producing the de sired shed of the warp. In those cases where a change of the natureofthe filling or, weft is required, which change may be a change of color or a change of nature of the yarn, for

making borders, check designs, stripes and the like, pegs are inserted in the'bars of the chain, in order to control the change of the weft shuttle to efiect change of the weft. The number of links or bars required for this purpose is often very large, since sufiicient links must be provided to weave the entire pattern until a repeat of design is reached. Thus,-if

- a check designof simple weave is to be woven, wherein 50 white picks and 50 colored picks are required, if each link controls two picks, achain of- 50 b-arsis required in order to efliect the required change in the weft,"despite the fact that the number of bars required for actuating the shafts of the har-K ness to obtain thedesired weave is very small.

In accordance with my invention, an auxiliary cylinder is provided in' dobby loom,

' which auxiliary cylinder is adapted to actuate the mechanism forcausing a change in the weft shuttle. This'auxiliary cylinder in turn is controlled by pegs, or absence of pegs, on the pattern chain of the main dobby cylinder, so that it may remain stationary for any desired number of picks. By this. means, thenumber of links or bars in the dobby chain maybe materially reduced.

Referring to the drawing, the figure shown therein is'aperspective view of my-invention shown in connection with that part of aloom that is necessary for an understsanding of the same. v I On the drawing, 1 indicates the ordinary dobby cylinder that is rotatable and which is provided with the pattern chain made up of pattern bars 2, 2a, 26,20, 2d, etc. These'pat- A ternubars have the usual holes therein in which pegs may be inserted in the required places, in order to actuate the dobbyfingers andknives in such a manner as to raise and shown in the drawing, pattern link 2 is provided with a peg 3, the link 2a has no peg, the

link 2b has the peg13a, while of the remaining links, some have pegsand others do not have pegs. Y a By my invention, I provide an auxiliary cylinder 4'that is mounted for rotation and which is provided with a chain or bars or links, 5, 5a, 5b, etc., which have holes therein at one end in which pegs 6, 6a, etc., may-be inserted in certain predetermined bars. As shown in the drawing, the bar 5 is provided with thepeg 6, while bars 5a and 5?; have no pegs. I

Thecylinder is provided with a ratchet 7, which is adapted to be engaged by a pawl 8 on the bell crank lever 9, the lower end 10 of which rides on the lever 11 that is pivoted at 11d. This lever 11 is connected by the arm lower) the: desired shafts of the harness;

ciprocate by means of the arm 180, connecting rod 19 and rotating eccentric 20. It will thus be seen that during the operation of the loom, the bell crank lever 9 is constantly reciprocating because of the reciprocation of the griifebars, but as long as there is a peg, such as peg 3, on the pattern links 2,. 2a, etc., the peg will raise the lever 13, arm 12, lever 11 and thus the pawl 8, so that the pawl does not engage the ratchet 7 of the auxiliary cylinder. However, if a pattern link 2a having no peg is in operative position, the lever 13, arm 12, lever 11 and the pawl 8 will drop so that the pawl 8 engages the ratchet 7, and because of the reciprocating motion imparted thereto .by the arm 16, the pawl will cause the; auxiliary cylinder 4 to rotate and thus bring a new bar 5, 5a, etc.,. into operative position.

The. pegs 6, 6a, etc, on the bars 5,. 5a, etc., of the auxiliary cylinder 1 are adapted to engage the arm 21 of a lever pivoted at 22, which lever has anarm 23 adapted to. engagethe upper member25, and a link 24 connected withthe lower member 26, of mechanism 27 that is connected by the member 28 with the lever 29 thatoperates by suitable mechanism-(not shown) the shuttle holder changing mechanism. Stops 25a and 260 are provided for limiting the backward motion of the members 25 and 26' respectively, these steps being; of the usual character adopted in loom dob-by mechanisms. 7

When there is a peg 6, 6a,. etc, onthe bar 5,501,, etc., that,is in the operative position, the arm 21 is raised and the members 23 and 2 1 lowered, thus causing the hooks 30 and 31 toengage the reciprocating upper and lower, griffe bars 17 and 18' respectively, and the lever 29 isthus caused to move to. the right and, to operate the weft shuttle changing mechanism, andthus the weft shuttle is changed, either by dropping a shuttle box or causing; a new shuttle to comev into use by rotation of a rotating shuttle holder.

The operation of the device is as follows Assuming the mechanism to be in the position shown on the drawing,.the peg 3- on the pattern link 2 is in operative position and raises the members 13, 12, 11 and so: that the pawl 8 is out of engagement with the ratchet 7, and therefore the auxiliary cylinder 4 is stationary. The bar- 5 of the auxiliary cylinder chain being in operative position, the peg- 6 thereof raises the arm 21, and therefore the members 28 and 2a are lowered causing the hook 8O ofthe arm to engage the reciprocating grifie bar 17,. and the arm 25 is carried forwarda-bout 3 inches, with the pivot of member 26, abutting against the stop 26a, acting as. a fulcrum, and member 28. is moved I a distance of 1 causes the shuttle box to be moved in its up permost position. On the next pick of the loom, the. griffe bar 17 andhook move back- This motion 7 wards, and the hook 31 is caught on griife bar 18, and carried forward a like distance, so that the lever 27 merely turns on an imaginary fulcrum at its centre, and lever 28 remains in the same position, 1 inches from its normal position, and lever 29 remains stationary. This continues as long as a bar 5 containing peg 6 remained under lever 21 with the lever 27 oscillating about its centre, and the shuttle box remains in its topmost position.

When the pattern bar 2a comes in operation, since there is no'peg thereon, the members 13,12, 11 and 10 drop, so that the pawl 8 engages the ratchet 7, and since this pawl has a'constant reciprocating motion imparted thereto by the motion of the grifie bars, the pawl causes the auxiliary cylinder 4-. to. rotate and bring the bar 5a in operative position- Since the bar 5a has nopeg, the. arm 21 drops.

and raises the members 25 and 26 out of engagement with the griife bars 17 i and 18, so tha u the lever 29 is moved to the left either by the weight" of the shuttle box or-by a spring, so that the shuttle-boxis dropped and the weft shuttle is changed. On the next operation, the pattern link 2?). comes into the operative position, and since it has'the peg 3a thereon, this peg will lift the pawl operating mechanism, and the pawl will be disengaged: from the ratchet, so that the cylinder t-remains stationary. This cylinder twill remain stationary as long as pattern links 2, 2a,, etc. having pegs are. in operation, so that the same weft shuttle remains in the loom. It is only when a pattern link having. no peg is in the operative position that the cylinder 4 is moved, and a new auxiliary bar 519- comes in operation, which may or may not have a peg to cause the shuttle box changing mech anism to operate.

By my device, changes in Weft may be effected very simply. This change of weft may be change of color of yarn, change of nature of yarn, or merely change of shuttle to replenish the supply of the same. Thus if a: mixed fabric containing mixed natural silk and yarn made of an organic derivative of cellulose such as cellulose acetate in the weft is to be made, shuttles containing these different yarns may be changed by my mechanism.

To illustrate the advantages accruingfrom my invention, the following instance will be given. Assuming that a striped fabric is to be woven having a pattern of 20 picks red filling, 40 picks white, 20 picks red, and 80 picks white filling. If my mechanism is not used, and supposing one link ofthe pattern chain is required for each two picks, apattern chain of 80 links will be required. By the use of'my invention, a pattern chain of only 8 links on the auxiliarycyli'nder r, and a pattern chain of 10 links on the ordinarycylinder 1 is required. Of. the ten links on cylinder 1, nine consecutive ones have pegs 3a, 36 etc., while the tenthlinkis without a peg. Of the eight links of the auxiliary cylinder, the first has a peg, the next two have no pegs, the fourth has a peg, while the last four have no pegs. This cylinder is turned every two picks of the loom in the normal manner, and while the links which are provided with pegs are in operative position, the cylinder 4 remains stationary with a link 5 having a peg thereinunder the lever 21, so that the same filling of red yarn is being woven. Then the tenth link on cylinder 1, having no peg comes under lever13, it causes the cylinder 4 to bring link 5a having no peg therein'under the. lever 21, and the shuttle box is dropped, thus changing the shuttle so that a white yarn is woven as filling. This continues until the tenth link on cylinder 1 is again in operative position causing the auxiliary cylinder 4 to present the link 5?) under the lever 21, but as this link has no peg therein, the shuttle box is not changed,

7 and the white filling continues to weave for 20 picks more. The next link on cylinder 4 has a peg inserted, so that the shuttle box is raised, thus leaving the weft shuttle with the red yarn in operation for 20 picks. The next four consecutive links on cylinder 4 have no pegs therein, thus the shuttle box is dropped, and the shuttle containing the white scribed my name.-

said dobby pattern bars, reciprocating means co-operating with said grifie bar adapted to operate said auxiliary cylinder and means actuated by said lastnamed dobby bar pegs to engage and disengage said auxiliary cylinder. g I p 3. In a loom having a dobby pattern chain of bars, mechanism for controlling the movement of the shafts of the harness, a grifi'e bar anda shuttle holder changing mechanism,"the combination of an auxiliary cylinderhaving a chain of bars thereon, pegs on some of said bars, a mechanism having a hook, adapted to engage the griffe bar and con-' nected to the shuttle holder changing mechanism, a lever operated by the pegs on the" auxiliary cylinder bars to causesaid hook to engage the grille bar, a ratchet on said auxiliary cylinder, a reciprocating pawl connected tothe griife bar and adapted to engage said ratchet, pegs on the dobby pattern bars for actuating the mechanism controlling the movement ofthe shafts of the harness, other pegs on some of said dobby pattern bars, and mechanism operated by said last named pegs to cause the pawl to engage or disengage said ratchet.

i In testimony whereof, I have hereunto sub- CLIFFORD HARGREAVES.

yarn is in operation for picks, thus completing the repeat of the design;

It is to be understood that the foregoing detailed description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of my invention.-

' Having described my invention what I claim and desire to secure by Letters Patent 1. I In a loom having a' dobby with pattern bars, pegs for actuating the mechanism for controlling the movement of the shaftsof the harness, a grifie bar, and shuttle holder changing mechanism, thecombination of an auxiliary cyllnder having pegs thereon, a

hooked arm connected with the shuttle holder j changing mechanism, a lever actuated by said pegs for causing said hooked arm to engage the grifle bar, and means, including such;

grifi'e bar, actuated by said pattern bars to cause the auxiliary cylinder to rotate.

2. In a loom having a dobby with pattern I bars, mechanism for controlling the 'movement of the shafts ofthe harness, a griffe bar and shuttle holder changing mechanism, the combination of an auxiliary cylinder hav-' ing pegs thereon, a hooked arm connected with the shuttle holder changing mechanism,

a lever actuated by said pegs for causing said hooked arm to engage the griffebar, .pegs on said dobby pattern bars for actuating the mechanism controlling the movement of the shafts of the harness, other pegs on some of ice

Images