US1619394A - Loom dobby - Google Patents

Description

March 1 1927.

H. BARDSLEY LOOM BOBBY v Filed March 22, 1925 2 Sheets-Sheet l Y #mi H. BARDSLEY 4 LOOM BOBBY March l 1927.

Filed March 22, 1923 2 Sheets-Sheet 2 Patented Mar. l, i927.

UNETED STAT ortica.

HENRY BARDSLEY, OF PROVDENCE, rtOBE ICELAND, ASSIGNGR TO CROMPTON & KNOV/'LES LOOM WORKS, OF WORCESTER, IvASSACHSETTS, A CORPORATION OF MASSCHUSETTS.

L90M BOBBY.

Application filed March 22, m23. Serial No. 626,841.

rlhis invention relates to a loom dobby. Such dobbies when weaving handherchiefs or similar fabrics require provision for inserting a cross border or special design at regular intervals throughout the length of the fabric.

My invention relates particularly to that type of dobby in which a main pattern cylinder is provided for weaving the lengthwise border of the. fabric and an auxiliary pattern cylinder is provided for weaving the body of the fabric and also the cross border or other special design.

it is the object of my invention to provide improved driving mechanism and controlling devices b y means of' which the auxiliary pattern cylinder may be periodically operated as desired.

important features of my invention relate to thev positioning of the two cylinders so that they will rotate about the same axis and to the. provision of suitable driving mechanism for cylinders thus positioned, said mechanism bein g' jointly controlled from the two pattern cylinders.

My invention further relates to arrange` ments and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A. preferred form of the invention is shown in the drawings in which Fig. 1 is a front elevation of a dobby enr bodying my improvements;

Fig. 2 is a sectional plan view thereof taken along the line 2-2 in :d ig'. 1, and

Fig. 3 is a sectional elevation taken through the cylinders and along the line 3 3 in Figs. 1 and 2.

Referring to the drawings, I have shown a loom dobby which is in general of the usual type and comprises a frame 1() in which is mounted rocking levers 11 having connections 12 and 13 to the upper and lower lifter bars 14 and 15. Upper and lower dobby hooks 16 and 17 are positioned for engagement by the lifter bars 14 and 15 respectively and are pivotally supported at the opposite ends of connectors 18 pivoted at 19 to harness jacks 20. The jacks 2O have an angular movement about a cross rod 21 in the frame and are held from displacement by a second cross rod 22 extending through slots in the jacks. rlhe hooks 16 and 17 are raised or lowered by dobby fingers 23 which, in turn, are positioned by pattern chains 24 and 25. The chain 24 is mounted on a main pattern cylinder 26 and the chain 25 is mounted on an auxiliary pattern cylinder 27 (Fig. 3). The main cylinder 26 is fixed to a shaft 28, one end of which is provided with a bearing'in the dobby frame 10. The auxiliary cylinder 27 is fixed to a sleeve or tube 29 which has a bearing in the opposite side of the frame 10. 'ihe shaft 28'extends through the sleeve 2.() and is freely rotatable therein.

fr worm gear 3() is rotatably mounted upon the sleeve 2S) and is engaged by a worm 31 (Fig. 1) on a shaft 32, the worm being preferably of the intermittent type. The worr shaft 32 is continuously rotated tlirough gears 33 and 34 from a driving shaft 35 or in any other suitable manner.

A disc or plate 35 (Fig. 3) is fixed to the shaft 28 and a give-way arm 37 is pivoted to said plate and extends through a notch therein. The arm 37 is provided with a projecting portion 38 which is yieldingly held between lugs 40 on the side of the gear 30 by a coil spring 41 mounted between the 'Eil outer side of the arm 37 and the innerside of a collar 42 fixed to the shaft 28. The shaft 28 is thus permanently connected for rotation with the worm gear 8O but can yield relatively thereto if the pattern chain 24 is obstructed in its movements.

Provision is thus made fo-r regularly advancing the cylinder 26 and pattern chain 24 at every revolution of the shaft 32 and worin 81. l will now describe the connections for periodically actuating the auxiliary cylinder 27. A clutch pin 44 is fixed to a grooved collar 45 slidable on the sleeve 2.. and extends through an opening in a plate 46 fixed to said sleeve. llvlhen the pin 44 is moved outward, or to the right in F ig. 3, it will enter an opening 47 in the gear 30 and form a driving connection therefrom to the auxiliary pattern cylinder 27.

The clutch pin 44 is positioned by a yoke arm 50 fixed to a rod 51 mounted in bearings in the lower portion of the frame 10 and having a lever 52 secured to the opposite end thereof. A coil spring 53 is interposed between a collar 54 on said rod and a fixed bearing 55 thereof and tends to yieldingly withdraw the clutch pin 44 from operative position.

The lever 52 is connected to a pair of jacks 2Oa and 20h by light chains or other flexible ilo Jil

connections 56 and 57. `The acls 2Oa and 2()h are controlled by dobby fingers 255i1 and 23" which may be positioned respectively by projections on the pattern chains 2li and 25 on the pattern cylinders 26 and 2T. Theprojections for the ingers 23a and 23" may be on separate chains on the cylinders instead of on the regular chains if desired, as the particular means for indicating the movements of the jacks 2()a and 20b form no part of my invention, and may be of any usual form.

The operation of my improved multiplier mechanism is as follows 2--The chains 56 and 57 `are connected to hoollz-shaped projections` on the lower ends of the jacks so that 1n 'n' \,A ment of a jack to the left by its connector 18 will pull the chain upward and correspomlingly swing the lever 52 upward. Such movement engages the clutch pin lll and starts the auxiliary pattern cylinder 27. The first advance movement of the pattern chain on the cylinder 27 may be utilized to raise the dobby finger 23"', advancing the jack 20h and maintaining the lever 52 in raised position, regardless of the return of the jack 20 to its lower position on the next advance movement of the chain 24 on the main cylinder.

The auxiliary pattern cylinder will be held in operation until the jack 20b releases the lever 52 so that the spring 53 may yieldingly withdraw the clutch pin 44. An exceedingly simple mechanism is thus provided for starting and stopping the auxiliary pattern cylinder.

Havingthus described my invention and the advantages thereof, I do not wish lo be limited to the details herein disclosed otherwise than as set forth in the claims but what I claim is l. In a dobby, a main pattern cylinder adapted to control the weave of a portion of the width of a fabric and an auxiliary pattern cylinder rotatable about the same axis and adapted to control the weave of the re- Inaining,` portion of the fabric, means to regularly advance the main cylinder', additional driving mechanism for periodically advancing the auxiliary cylinder, and means jointly controlled by said two pattern cylinders for maintaining said additional driving mechanism operative for a determined period.

2. In a dobby, a mainV pattern cylinder adapted to control the weave of a portion of the width of a fabric and an auxiliary pattern cylinder rotatable about the same' axis and adapted to control the weave of the remaining portion of the fabric, a rotary driving member having continuous engagement with said main cylinder, a clutch between said driving member and said auxiliary cylinder, and operatingl devices for sait clutchl jointly controlled by said two cylinders.

3. In a dobby, a main pattern cylinder adapted to control the Weave of a portion of the width of a fabric and an auxiliary pattern cylinder rotatable about the same axis and adapted to control the weave of the remaining portion of the fabric, a rotary driving member havingv continuous engagement with said main cylinder, a clutch between said driving member and said auxiliary cylinder, a lever connected to position said clutch', yielding,` means to disengage said clutch, a pair of jacks controlled by said main cylinder and said auxiliary cylinder respectively, and connectionsfrom said jacks to said lever through which connections either jack may move said lever to engage said clutch.

In testimony whereof I have hereunto aiiixed my signature.;

HENRY BARDSLEY.

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