US1819543A

US1819543A - Harness leveling mechanism

Info

Publication number: US1819543A
Application number: US509064A
Authority: US
Inventors: Harry A Davis
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1931-01-16
Filing date: 1931-01-16
Publication date: 1931-08-18
Anticipated expiration: 1948-08-18

Description

HARNESS LEVELING MECHANISM Filed Jan. -16. 1931 Is Sheets-$heet 1 Fig.1.

ATTys Aug; 18, 1931,

' H. 'A. 05w A 1,819,543 HARNESS LEVELING ECHANISI Filed Jan. 16,1931

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Aug. 18, 1931. H. A. DAVIS HARNESS LEVELING MECHANISM Filed Jan. 16. 1931 3 Sheets-Sheet 3 ATTys.

Patented Aug. 18, 1931 UNITED STATES ATENTY OFFICE HARRY A. DAVIS, OF I-IOPEDALE, MASSACHUSETTS, .ASSIG-NOR '10 DRAPER COB-1'0! RATION, 0F HOPEDALE, MASSACHUSETTS, .A COBPORATTEON OF IDIAINE HARNESS LEVELING MECHANISM Appli at on filed January 1 .1931. S r l N 50 .064.

This invention relates to mechanism for leveling the harness frames in a loom in which the harness frames are operated by cams and in which there are more than two harness frames.

In the weaving of certain fabrics, particularly those composed of rayon, the appearance of the fabric is rendered defective if the loom is left standing for a considerable period, such as over a week-end or even overnight, with the warps under unequal tension. Where the warps are of rayon, which is relatively non-elastic, and the shed forming mechanism is left with the harness frames not levelled, the warps are unequally stretched and permanently set so that there is a markedly different appearance in a section of the cloth woven when the loom is started after standing for a considerable period. This difficulty may be overcome by leveling the harness frames when the loom is stopped so as to eliminate any unequal tension in the warps. When, as is common, the harness frames are operated by cams and there are more than two harness frames employed, it is usually impossible to bring all the harness frames to a level at one time. Two of the harness frames may be levelled,

but the one or more others, depending upon the number of harness frames in the loom, cannot also be brought to the level.

In this invention means'are provided for shifting the fulcrums of the levers by which the respective cams operate all but two of the harness frames so that by shifting these fulcrums those harness frames may be levelled which remain unlevelled after the leveling of the harness frames which can be levelable by the cams.

The invention further. consists in providing an eccentric fulcrum bearing for each cam-operated harness frame lever in excess of two so that by rotatably shifting these fulcrum bearings all of the harness frames may be brought to a level and-thus eliminate unequal tension on the warps when the loom is to be left standing.

The invention further consists in providing means for shifting at least one of the said fulcrum-bearings from the front of the loom so as to enable the operator standing at the front of the loom to level the harness frames.

- These and other objects and features of the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claims. 7

The drawings illustrate so. much of an ordinary type of loom in which more than two harness frames are employed and in which theseharness frames are each operated by a cam and lever mechanism as is necessary to a disclosure of a preferred form of the present invention.

In the drawings: 1 I j Fig. 1 is a side elevation chiefly in vertical cross section of the loom with those parts which are not concerned with the invention removed.

Fig. 2 is a detail in rear elevation partially broken away-showing the support and bearings for the harness frame operating levers as adapted to a loom employing three camoperated harness frames. Fig. 3 is a view similar to Fig. 1 with further parts of the loom removed showing the three'harness frames brought to a level.

Fig. 4 is a detail in side elevation show ing the position of the fulcrum bearing of the third harness frame shifted to leveling position.

Fig. 5 is a view similar to Fig. 2 with the mechanism adapted 'for four cam-oper ated harness frame levers.

Fig. (i is a side elevation partially in vertical cross section of a portion of the loom showing a preferred construction for leveling one of the frames from the front of the loom.

i the formation of the sheds.

Fig. 7 is a detail in rear elevation of a portion of the construction shown in Fig. 6.

The loom illustrated is an ordinary type comprising side frames 1 with the cross girts 2 and 3, breast beam 4, crank shaft 5, cam shaft 6, and lay rocker shaft 7. The loom is shown as provided with more than two harness frames, in this case three such frames 8, 9, and 10 being shown. The warps as usual pass from the warp beam, not shown, over the whip roll 11, around the lease rods 12, through the heddles of the harness frames, through the reed 13 carried by the lay l4, and thence over the breast beam to the take-up and cloth rolls, not shown.

Each harness frame, in the type shown, is provided with flexible connectors 15 extending over idler pulleys 16 on the loom arch to springs, not shown, which thus act to raise the heddles in a familiar manner.

The harness frames are shown as drawn down to effect the shedding operation by a generally familiar type of cam mechanism.

For this purpose a serles of cams corresponding in number to the harness frames are mounted upon the cam shaft 6. In the illustratedcase where three harness frames are shown, there are accordingly three cams 17, 18 and 19 for respectivelyoperating the frames 8, 9, and 10. These cams act respectively against the harness frame levers 20, 21, and 22. A follower roll 23 is journalled in each lever to cooperate with the corresponding cam. These levers are fulcrumed at the rear of the loom upon the shaft 24 and at their'forward ends are connected respectively by the usual connec tions 25 to their respective harness frames. As this general type of mechanism is a familiar one, no further description is necessary. As the cam shaft 6 rotates, the several cams in conjunction with the springs at the top of the loom operate to raise and lower the respective harness frames as required in It will be seen that with such a type of construction it will be possible to bring all three harness frames to the level position. As shown in Fig. 1, two of the harness frames, as 8 and 9, for example, may be brought to the level position, but the third harness frame, as 10, cannot at the same time be brought to this position. 7

The shaft 24 is shown as mounted in a bracket 26 secured to the cross girt 2. Two of the harness frame operating levers, as, for example, the

levers

20 and 21, are fulcrumed directly on the shaft 24. The-third lever, as, for example, the lever 22., is fulcrumed on a fulcrum bearing 27 eccentrically mounted on the shaft 24, the rearward end of this lever being enlarged for this purpose. This fulcrum bearing. 27 is extended out at one side of the lever 22 and provided with a projecting handle 28. It will thus be seen that by rotatably shifting the fulcrum bearing 27 on the shaft 24, as by means of the handle 28 provided for that purpose, the third lever 22 may be brought to a position which will bring the harness frame operated by it, as for example, the frame 10, to the same level position as the other frames which have been levelled by the cams. In Figs. 1 and 2, and in full lines in Fig. 4, the fulcrum bearing 27 is shown in its normal position with the handle 28 standing upright. In Fig. 3, and in dotted lines in Fig. 4, the harness f'ramesS and 9 have been levelled by the cams and the fulcrum bearing 27 has been rotatably shifted 180 by swinging the handle 28 to a downward position, thus shifting the fulcrum point of the lever 22 and bringing the harness frame 10 controlled by it to the same level position as the other two harness frames. 7

The invention is applicable to any number of cam-operated harness frames above two where the harness frames by reason of their number cannot be levelled by their cams. The bracket 26 is shown as of sufiicient size to provide for the fulcruming of more than three cam-operated levers and collars 29 are mounted on the shaft 24 to fill in the vacant space. In Fig. 5 one form of arrangement is shown where there are four cam-operated harness levers mounted on the shaft 24. In this case, for example, the two

intermediate levers

30 and 31 are fulcrumed directly upon the shaft while the two

outermost levers

32 and 33 are fulcrumed on

fulcrum bearings

34 and 35 eccentrically mounted on the shaft 24 as in the case of the fulcrum bearing 27 and are each provided with an

operating handle

36 and 37 respectively, similar to the handle 28 already described. In such case the harness frames operated by the

levers

30 and 31 will first be levelled by the cams and then the harness frames operated by the

levers

32 and 33 will be brought to the same level by shifting the

eccentric fulcrum bearings

34 and 35 by means of the

handles

36 and 37.

The application of the invention to any further number of harness frames above two will be apparent from the foregoing.

The invention also provides means whereby the harness frames may be levelled by the harness frame operating mechanism is the same as that already described and but a single set of elements is shown which, of

course, may be duplicated or repeated as desired. The cam shaft 38 carries the cam 39 engaging the follower roll 40 journalled in the harness frame lever 41. This lever at its rear end is fulcrumed on the fulcrum bearing 42 eccentrically mounted on the shaft 43. This shaft 43 as before is carried by a bracket 44 secured to the cross girt 45 of the loom frame corresponding to the cross girt 2 of the loom frame. The fulcrum bearing 42 has a lateral extension 46 concentric with the shaft 43.

A transmitting shaft 47 extends from adjacent the shaft 43 to the front of the loom. This shaft is shown as journalled at its rear end. in a bracket 48 depending from and secured to one end of the shaft 43 and as journalled at its forward end in a bracket 49 secured to the front cross girt 50 of the loom frame. At its front end the transmitting shaft 47 is provided with suitable means such as a hand wheel 51 which enables the shaft to be rotated by the opera tor at the front of the loom.

At its rear end the transmitting shaft 47 has gearing connections with the fulcrum bearing. In the construction illustrated, the gearing connections between the transmitting shaft 47 and the fulcrum bearing 42 are shown as of the worm and worm wheel type. A worm wheel gear 52 is secured to the hub 46 of the fulcrum bearing 42 concentrically therewith and a worm gear 53 is secured to the rear end of the shaft 47 and intermeshes with the worm wheel gear 52. A stop pin 54 inserted radially inthe worm wheel. 52 or its hub engages in one position of rotary adjustment with the Worm 53 and in the other position with the bracket 44 to define the required positions of the fulcrum bearing.

It will thus be seen that by means of this invention it is readily possible to level all the harness frames in a cam-operated harness frame loom where there are three or more harness frames, each operated by a cam-operated lever. Thus when the loom is left standing for any appreciable period, any unequal strain on the warps due to the action of the shed forming mechanism may be obviated simply by leveling the harness frames and any danger of impairment of the appearance of the fabric due to unequal stretching of the warps when the loom is left standing is prevented. The leveling operation may also conveniently be performed from the front of the loom when desired.

Having thus described the invention, what is claimed as new, and desired to be secured y Letters Patent, is:

1. A loom comprising more than two the lever eccentrically mounted on the shaft,

and means, for rotatably shifting the said bearing on the shaft to level the harness frame when desired.

8. In a loom a cam-operated harness frame lever, a shaft, a fulcrum bearing for the lever eccentrically mounted on the shaft, and a handle projecting from said bearing for rotatably shifting the said bearing on the shaft to level the harness frame when desired.

4. A loom comprising more than two harness frames, a lever for operating each frame, a cam for operating each lever, a common fulcrum shaft for the said levers, a fulcrum bearing for each lever in excess of two eccentrically mounted on the fulcrum. shaft, and means for rotatably shifting the said fulcrum bearings on the shaft to enable all the harness frames to be levelled when desired.

5. In a loom a cam-operated harness frame lever, a shaft, a fulcrum bearing for the lever eccentrically mounted on the shaft, a transmitting shaft extending from adjacent the first shaft to the front of the loom, means on the front end of the transmitting shaft for rotating the same, and gearing connections between the transmitting shaft and the fulcrum bearing whereby the said bearing may be rotatably shifted to level the harness frame from the front of the loom.

6. In a loom a cam-operated harness frame lever, a shaft, a fulcrum bearing for the lever eccentrically mounted on the shaft, a transmitting shaft extending from adjacent the first shaft to the front of the loom, means on the front end of the transmitting shaft for rotating the same, and intermeshing gears one on the fulcrum bearing and the other on the transmitting shaft whereby the said bearing may be rotatably shifted to level the harness frame from the front of the loom.

7. In a loom a cam-operated harness frame lever, a shaft, a fulcrum bearing for the lever eccentrically mounted on the shaft, a transmitting shaft extending from adjacent the first shaft to the front of the loom, means on the front end of the transmitting shaft for rotating the same, a worm wheel gear on and connecting with the fulcrum bearing, and a worm gear on the transmitting shaft cooperating with the worm wheel gear whereby the said bearing may be rotatably shifted tolevel the harness frame from the front of the loom.

8. In a loom a cam-operated harness frame lever, a shaft, a fulcrum bearing for the lever eccentrically mounted on the shaft, and means located at the front of the loom and connected to the fulcrum bearing for rotatably shifting the said bearing on its shaft to level the harness frame When desired.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS.