US2612189A

US2612189A - Pattern chain cylinder for dobby looms

Info

Publication number: US2612189A
Application number: US137816A
Authority: US
Inventors: William A Blanchard
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1950-01-10
Filing date: 1950-01-10
Publication date: 1952-09-30
Anticipated expiration: 1969-09-30

Description

P 1952 w. A. BLANCHARD 2,612,189

PATTERN CHAIN CYLINDER FOR DOBBY LOOMS Filed Jan. 10, 1950 INVENTOR L WILLIAM ABLANOHARD 39 ATTORNEY Patented Sept. 30, 1952 UNITED/STATES PATENT. OFFlC E PATTERN CHAIN (3%;INDER FOR DOBBY William A. Blanchard, Millbury, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a; corporation of Massachusetts Application January 10, 1950, Serial No. 137,816

This invention relates to improvements in 4 Claims. (Cl. 139-330) inder shaft, when driven through the hole, is f likely to be bent and require a straightening operation which may break the wood.

It is an important object of the present invention to make a dobby chain cylinder of several preformed members, preferably formed of plastic material, having accurately aligned bores for the shaft and secured together'to form a unified rigid cylinder.

Dobb-ies are generally made of varying capacities, dependent upon the number of harness frames in the loom, and each different capacity requires a corresponding length of pattern cylinder. Thus, a twenty-five harness loom requires a longer cylinder than does a sixteen harness loom. Heretofore, it has been necessary to keep on hand pattern cylinders of various lengths all of which, however, have similar end heads- It is an important object of the present invention to provide pattern cylinder end or head members suitable for cylinders of various lengths and secure them to chain driving cylinder members of different lengths, depending upon the number of will appear as the description proceeds, the invention resides in the combination and arrangementof'parts hereinafter described-and set forth.

In the accompanying drawings-whereina convenient embodiment of the invention is set forth,

Fig. 1 is a side elevation of the lower part of a dobby having the invention applied thereto,

Fig. 2 is a horizontal longitudinal section'on line 2-2,Fig. 1,

Fig. 3 is an end view looking arrow 3, Fig. 2, e Fig. 4 is a transverse vertical section on line 44,Fig. 2, e

Fig. 5 is an enlarged detail longitudinal section on line 5-5, Fig. 4,

Fig. 6 is a-transverse vertical section on line in the direction of 66, Fig. 2, and

harnesses in the loom on which thecylinder is v to be used.

In order to reduce the cost of the material used for making the chain driving cylinder members the latter are in the form of thin shells or sleeves or constructed as to have interiorly opening slots within the elongated pattern chain driving teeth. It is another object of the present invention to provide a reinforcing spider or the like intermediate the end heads having teeth which fit into the aforesaid slots and thereby support and also align the cylinder members.

It is a still further object of the invention to provide the end members with teeth or lugs which fit into parts at least of the previously mentioned interiorly opening slots in order to provide positive driving connections between the end members and the cylinder members.

With these and other objects in View which Figs. '7 and 8 are enlarged detailed longitudinal sections on lines l'! and 8- -8, respectively, Fig. 6.

Referring particularly to Fig. 1, the dobby frame [0 supports a drivingshaft H having secured thereto a sprocket l 2 meshing. with a chain 13. The latter is driven from one of the loom shafts and causes rotation of a worm I4 meshing with the worm gear 15 secured to' adobby cylinder shaft It. 'If the dobby is of the'so-called double index type the worm will give the shaft I6 an angular motion every second pick of the loom. I

A support rod 2(ihas mounted thereon a plurality of dobby fingers two of which are shown at 2| and 22. When in low position the fingers have their rightends as shown in Fig. 6 s'upportedby a fixed bar23. The left ends of the fingers 2| and 22 are provided with

arms

24 and 25, respectively, one of which supportsan upright rod 26 for atop hook (not'shown) and the other of which supports a lower hook 21.. The hooks are connected to a dobby back lever 28 pivotedto a harness frame lifting jack (not shown). One of the two hook engaging knives of the dobby is indicated at 29 and reciprocates backwardly and forwardly ina slot 30 formed in the dobby. frame l0. When a finger is raised its hook will be in the path of a knife, and when in down position the hook will be lifted above the knife path.

In order to determine the vertical position of the fingers 2| and 22 there is provided a pattern chain 3| comprising a plurality of chain bars 32 connected together by links 33 and having set therein finger. lifting pegs 34, The pegs'are arranged according to the pattern desired in the fabric being woven, and as each chain bar moves to indicating position due to movement of, shaft 3 it its pegs will lift the fingers over them and the fingers over blank spaces on the bar will either fall or remain in down position.

The matter thus far described is of common construction and operates in the usual manner. The dobby chain bars 32 are customarily made of wood and the pegs are made of metal and inserted into holes drilled in the bars 32. Although only two fingers are shown, it will be understood that the dobby will have a set of fingers, generally a pair of fingers for each harness frame.

The present invention relates to the pattern chain cylinder, designated generally at. C, which drives the pattern chain 3|. As shown in Fig.

2 the cylinder is made of right and left end or I head members and 35, two pattern chain driving cylinder members 3? and 38, and an intermediate reinforcing and aligning spider 39.

Referring particularly to the right end of Fig. 2, the end member 35 is formed with a. hub 49 having a bore 4| fitting the shaft [6, and has a beveled flange 4 2 which engages the beveled end 43 of a 'chain bar 32. The end member is also formed with a radial web at from which extends a cylindrical tube 45. A pin 46 driven through hub and shaft [6 fastens these two'parts together and causes the end or head member 35 i to turn with the shaft.

The sleeve or cylinder member 37, as shown in Fig. e, is provided with a plurality of elongated chain bar driving teeth or tooth elements formed with slots 5! which open 'interiorly into the member 31. The teeth elements are made with thin longitudinal walls 52 and the inner or lower ends of the walls of adjacent teeth are joined by a door 53 at the bottom of an outwardly opening chain bar receiving lengthwise slot 54. The tops of the walls 52 of each tooth 50 are connected by a bridge 55. Each inwardly opening slot 5i is defined by the associated walls 52 and bridge 55, and the floors 53 support the chain bars 32.

The tube 45 of the member 35 has radially extending lugs 56 which fit into notches 57 formed in the end wall 58 at the right of the cylinder member 31 as viewed in Fig. 2. Notches 51 open into slots 51 and lugs 56, by their engagement with the parts of the member 37 at the sides of the notches, constitute a positive driving connection between the

members

35 and 31. The inner end of'tube-fiifits against shoulders 59 formed on the floors 53 inwardly of the end wall 58, see Fig. 5, thereby determining the distance between the flange 42 and the adjacent ends of teeth 50.

The'members 3t and 38 are substantially the same as

members

35 and 31, respectively, and the

cylinder members

31 and 38 will be collectively of a length required for the dobby cylinder. If it be desired to make a shorter dobby cylinder the

sections

31 and 38 will be shorter, and conversely, they will be longer for a longer dobby cylinder.

In some weaves it may be necessary to lift a la'rgenumber of

fingers

21 or 22 and in order to support their weight it is desirable that the

cylinder members

31 and 38 be reinforced by member 39. The latter is formed with a" web 60 having an ap'erture or bore 5| which has a close fit with the shaft 16. The 'web' is'iritegral with a cylindrical 62 formed 'w ith a bead 63 which fits into notch'es 65 on the adjacent ends of the cylinder members '31 and "38. Extending-beyond therim'GZ are teeth 55 "which-fit into the slots 5|. Each tooth '65 has a rim ES projecting laterally-from a web's! toeng'agethe 4 associated walls 52 and bridge 55. Each tooth 65 aligns the corresponding chain driving teeth 55 of the section members 31 and 3B, and also affords support for the teeth 59 with respect to the shaft IS.

The various members of the cylinder C are preferably made of a plastic material, such as V polystyrene or cellulose acetate butyrate. These materials are thermoplastic and the engaging or abutting parts of the several members can therefore be secured together either by a proper cement, or can be fused in a high frequency electric field. The end or

head members

35 and 36 are pinned in position on the shaft l6 and have abutting engagement with the members 3! and 38, and for this reason it may not be necessary in all instances to employ cementing or fusing, but the latter is preferred as it gives additional strength to the assembled cylinder. While only two specific plastic materials have been menv tioned the invention is not necessarily limited to them. I

From the foregoing it will be seen that the invention'sets forth a lightweight dobby pattern chain fcylinder made of material having a very low water absorption factor and constructed of members which fit together to form an integrated cylinderd'rive by the shaft [8. It will further be seen that the end members are interlocked with the adjacent ends of the cylinder members so that positive driving relation is established between the end members and the sections 3! and 38. Also, it will be seen that the reinforcing spider 39 not only gives additional support to the cylinder members at a point intermediate the end members, but its teeth 65 also align the elongated chain driving teeth 50 and thereby define smooth uninterrupted slots 5| for the chain bars 32.

Having thus described the invention it will be I seen that changes and modifications of the forenesting the cylinder members and formed with teeth entering the inwardly opening slots of said cylinder members to align the outwardly-opening slots of said cylindermembers, the ends of the cylinder members remote from the reinforcing member being formed with notches, and tooth means on each e'nd'membe'r entering the notches in the adjacent cylinder member causing the cylinder members to turn with the 'end'mem'bers when the shaft is rotated.

2 In a fabricated dobby pattern cylinder for a dobby chain comprising linked bars, a shaft extending axially of the cylinder, two aligned hollow cylinder members each formed with outwardly opening chain bar receiving slots, .a spider member within said cylinder men'ibers,interlocking means on the spider member and adjacent ends of the cylinder members causing thelatter to turn together, and end members on the shaft-one secured to one of said cylinder members and the other secured to .the'other cylinder member.

3. Ina fabricated dobbypattern cylinder for a dobby chain comprising linked bars, a shaft extending axially of the cylinder, a pair of hollow aligned cylinder members each formed with chain driving teeth between outwardly opening chain bar receiving slots, each chain driving tooth having an inwardly opening slot and said inwardly opening slots being spaced by floors integral with the cylinder member and extending across the bottoms of the outwardly opening slots, a reinforcing spider member within said cylinder members engaging said floors and extending into the inwardly opening slots of said cylinder members to align the latter, and and members secured to the ends of the cylinder members remote from the spider member and secured to said shaft.

4. In a fabricated dobby pattern cylinder for a dobby pattern chain comprising linked bars, a shaft extending axially of the cylinder, a hollow cylinder member having outwardly opening chain bar receiving slots and having chain bar driving teeth formed with inwardly opening slots, spaced end members secured to the shaft each formed with teeth entering the inwardly opening slots at the adjacent end of the cylinder member and establishing positive driving connection between" the cylinder member and the end members when.

the shaft is rotated. WILLIAM A. BLANCHARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS