US2942626A - Jacquard machines - Google Patents

Description

June 28, 1960 c. T. .DRACUP ETAL 2,942,626

JACQUARD MACHINES Filed Feb. lO, 1955 7 Sheets-Sheet l June 28, 1960 c. T. DRACUP ET AL 2,942,626

' JACQUARD MACHINES Filed Feb. 1o, 1955 7 sheets-sheet 2 F/GZ.

[nvent'ors www June 28,- 1960 c. T. DRACUP ET AL 2,942,626

JACQUARD MACHINES Filed Feb. lO, 1955 7 Sheets-Sheet 3 A itorneys June 28, 1960 Y c. T. DRACUP ET AL 2,942,626

JACQUARD MACHINES Filed Feb. 1o,` 1955 7 sheds-sheet 4 F/GS.

26 26 Q/ rw @jg Attorneys June 28, 1960 Filed Feb. l0, 1955 C. T. DRACUP ET AL JACQUARD MACHINES '7 Sheets- Sheet 6 ByMu-w.

June 28, 1960 c. T. DRACUP ET A1. 2,942,626

JACQUARD MACHINES Filed Feb. lo, 1955 7 sheets-sheet 7 4 4 7 Pff 9 Ufff United States Patent O JACQUARD MACHINES Cyril T. Dracnp, Holly Bank, Holly Bank Road, Great Horton, and George Dracup, 1 Baslow Grove, Toller Lane, both of Bradford, Yorkshire, England Filed Feb. 10, 1955, Ser. No. 487,390

Claims. (Cl. 139-63) This invention relates to Jacquard machines and is particularly applicable to double cylinder Jacquard machines.

It is sometimes desired to arrange the pattern cards of a Jacquard machine so that a particular warp thread will remain in the up position for two or more picks of the loom. Such an arrangement is known as semiopen shed weaving. This is achieved by providing each warp thread hook with two catches or hooked pieces at the top, one catch facing each side of the machine. As the grid on one side of such a hook rises it carries with it the hook to a top position. As this grid descends it allows the hook to fall, but for semi open shed weaving the grid on other side of the hook which is then ascending is arranged to engage the other catch and lift the hook back to the top position. The pattern cards are so arranged that the grids continue to lift the hook to the upper position at each pick so long as an open shed is required.

A disadvantage of such an arrangement is that at each pick the hook descends half way and is then caught by the other grids; this results in a loss of power and wearing of the catches, harness threads and warp threads, due to the ascending grid checking the fall of the hook. It is an object of this invention to prevent this objectionable action.

According to this invention a Jacquard machine is provided with additional bars arranged to lie between the rows of hooks and to be moved during the operation of the machine so that for one pick they engage the hooks in one row, and then on the next pick the hooks in the other row. By this arrangement it is possible to retain a hook in the upper position for any required number of picks, the hook being continually either on its grid or the additional bar.

The hooks may be provided with additional catches the additional bars being adapted to engage the additional catches when the grids carry the hooks to 'the top of their movement.

The movement of the additional bars is preferably controlled by the Jacquard driving mechanism, and the bars are preferably carried in slots formed in fixed end plates and are rocked from one side to the other by means of movable plates which engage the bars and which are operated by suitable connections with the cylinder mechanism.

Alternatively the bars may be mounted on plates which are adapted to slide with a reciprocating motion so that they engage the hooks in one row and on the next pick the hooks in the other row.

In a still further alternative the bars may be pivoted about a longitudinal axis and formed with hooked or projecting pieces on each side which are adapted to engage the catches on the hooks.

The reciprocating rocking or sliding action can be transmitted to the bars by means of a cam mounted on a Shaft driven by the jacquard driving mechanism.

ICC

The invention will now be particularly described with reference to the accompanying drawings in which:

Fig. 1 is a sectional view of a jacquard mechanism.

Fig. 2 is a view similar to Fig. 1 showing part of the jacquard mechanism in an alternative construction.

Fig. 3 is a detail sectional view of part of the mechanism shown in Fig. 2 in one position.

Fig. 4 is a sectional view of the same part shown in Fig. 3 after a pick has taken place.

Fig. 5 is a detail sectional view of an alternative form of additional bar.

Figs. 6A, 6B, 6C, 6D and 6E are sectional views showing respectively the position of one hook with its associated grid bars and additional bars in various positions after each of five succeeding picks.

Fig. 1 shows the general arrangement of the jacquard mechanism, the frame 1 has two arms 3 pivoted to the upper supports 5 and these arms 3 carry at their lower ends a plate 7. The plate 7 is duplicated at the other end of the machine (not shown) and the two plates carry between them a series of additional bars 9, which in Fig. 1 are shown having a V-shaped cross section but which may be of varyingly shaped cross sections as will be hereinafter described.

The plate 7 at one end of the machine is provided with a projection 11 adapted to engage the forked vend 13 of a two armed lever 15 which is pivoted to the frame 1 at 17 and at its lower end has a cam follower 19 which engages a cam 21 on a shaft 23 which is geared to the jacquard driving mechanism. Thus rotation of the cam 21 is adapted to swing the lever 15 and thereby cause a reciprocating swinging motion to be transmitted to the plate 7 and thereby to the additional bars 9.

The jacquard is provided rwith the usual hooks 25 of substantially elongated U shape which at their lower ends are adapted to receive the warp threads or a connection to the warp threads, grids 27 and 29, and needles 31. The vertical wires or stems 33 forming the hooks are adapted to be engaged by notches formed in the needles 31 in the usual manner to press the hooks out of line with the grids 27 or 29 when required.

At their upper ends the two vertical wires 33 of each hook are each formed with two catches one above the other. The lower two catches 35 and 37 are adapted to be engaged by the grids 27 and 29 in the usual manner.

, The upper catches 39 and 41 are adapted to engage the additional bars 9 as will be further described.

It will be understood that other parts of the mechanism are required but these are common to all double cylinder jacquard mechanisms and have beeny omitted for clarity, only the cylinder 43 and needle boards 45 being shown.

In the alternative construction shown in Figs. 2, 3 and 4 the additional bars 47 are flat plates and are'canied in slots 49 in xed plates 51.

The slots 49 are formed with inclined sides so that the tops are of suiiicient width to allow the bars 47 to be rocked about their bottom edges, and to present the top edges alternately to the rows of hooks 25 on each side of each bar.

A movable plate 53 is also provided at one side of the machine and formed with slots 55 with the sides sloping toward each other at the top, and these slots are arranged to engage the bars 47 and to move them from one side of the slots 49 in the fixed plates 51 to the other.

The movable plate 53 is carried by two substantially vertical bars 54 pivoted at their upper ends to a part of the Jacquard framework. This will allow the movable plate 53 to oscillate in the desired manner. At one end the movable plate is provided with two cam followers 57 adapted to be engaged by a cam 59 driven from the Jacquard driving mechanism. The arrangement is such Y kthattlie 5.9 forces the plate 53 irst in the One diret!- from sideto side-,asdescrihed for the construction shownv in Fig. v1 and to engage one or other of'Y the Vhoolr catches 26.

In the arrangement shown in Figure itwill be noted that there is only one catch 26 ori-each hook stem, and that therefore the griff -is arranged to lift the hook slightly above the catch on the bar 61 to allowthe respective bar shift underneath it before the gril falls'. 'l The operation of one hook will now-be described to illustrate the operation of the machine with reference to Figs.f6A, 6B, 6(),'6 DY and 6E of the accompanying drawings and rising-the arrangement of additional bars Vshown hIFiaZ.Y Y i Y The griff 27,-on the left hand side .(Fig. 6A) engages the lower catch l35' o h that side of the hook and raisesl the hook in theusual manner as'shown at A. `At the upper end of its lift the top catches 39 and 41 are above= the additional bars 47 and nthe bars are rocked by the movable plate so that therbar Y,on the right hand side-is in position underthe c atch 41 Aon that side (unless the',

appropriaterneedle isi-pressed by the cylinder) and the i hook ,is therebygsuspended as shown at B V(Fig.v 6B).

On the nextpick the gritf129 Yon the -right hand-,side liftsrthe catches-39nd 41 clear of the additional bars 47,

Y Vwhich are :then rocked .overand thebar .on the left handlV side engagesthe nupper catchY 39. on that side .(unless the appropriate needle -isY pressed -byath'e Vcylindercard) as shown at C'(-Fig.`6C). "f-

- process is repeated Vso long as .it is desiredto retain the particular warp vthre'adf'at the upper position andY it willbe appreciated that the only movement vgivenrto the hook during this period is aslight lift to raise the catches clear of the bars :for therbars to change over, When it ment winto `and out of Vaieagcable relationshink with said catches on said irst and second stems alternately.

2. A Jacquard machine comprising hooks mounted in rows, each hook comprising rst and second vertical stems, catches on said stems, said catches on said rst stems projecting in the opposite direction to said catches on said second stems, ordinary griff bars engageable with said catches to cause lifting ofrsaidjhoolgs,'additional bars,

and means mounting said additional bars abovesaid ordinary griff bars for movement Yinto and out/'of engage; ment with said catches of said trst and secondl stems alternately for holding said hooks Vin raised positions.

3. A Jacquard machine,Y comprising hooks mounted in Y rows, each hook comprising rst andY second vertical stems, oppositely projecting catches on said first and second stems, ordinaryv grii bars engageable with said catches to cause lifting of said hooks, additional bars, and means mounting said additional bars above said ordinary griff bars kfor movement into alternative engagveble relationship with th'ecatches of the rst and second stems respectively of-hooks in adjacent rows, for holding Said r hooks in raised positions.

4. In a Jacquard machine, hooks mounted in rows,

u reach hook comprising first `and second vertical stems, op-

positely projecting catches on Vsaid rstand second stems, ordinary grii bars mounted for'rising and falling movement and forrengagement with saidfcatches to causclifting and lowering ofY said hooks, additional bars, and

means mounting said additional :bars above saidy ordinary /griff bars Vfor lateral -reciprocating Vmovement into alternative engagement with said catches on said first and secondcstems forY supporting said hooks in raised posiis desired to lower la thread, the appropriate Vneedle is Y pressedfby the cylinder vc'ar'd and the upper catch thereby Vforced out of line with the bar as shown at D (Fig. 6D)V Yin Fig. 5,Y no rocking action is necessary.'

What we -claim is:

1. A Jacquard machine comprising hooks mounted in rows, each hook comprising first; and' second vertical stems; eachfstem Shaving aV [catch von its upper end, .the

nary Vgriff bars 'engageable with the catch on `each first catch onV therst stein projecting in the opposite direc-'1 f .tion/to' the catch onV the Vsecond-stem, a trst set of Yordistem for raising said'ho'oks, a secondkset of ordinary grii i bars engage'able with 'the catch on each second stem for raising saidhooksadditional bars, and means mounting Y Y said additional bars abovel saidordinary griffs for move- References Cited inthe fileof .this patent i UNITED STATES PATENTS 545,240 Loekwood Aug. 27, 1895 Y Y 785,679 NovetV Mar. 21, 1905 900,948 `Perrine V Oct. V13, ,1908 Y 931,975 VTrachslerl 1.- Aug. 24, "17909 v FQREIGN PATENTS ,1998 Great Britain kof i903 Y 459,611 FranceY v sept. Y1o, v191s 630,112V France Aug. 9,7' 1927 V557,423

Germany Sept. 1, V19,32

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