US2187814A - Adjustable harness mechanism - Google Patents

Description

- Jan.23, 1940.

g. D. snbm I 2,187,814

ADJUSTABLEIHARNESS uncmmxsm Filed July 19. 19:9

2 Sheets-Sheet 1 INVENTOR; 63424. [7. Been N.

A'ITORNE Y.

Jan. 23, 1940.

2 Sheets-Sheet 2 FIG.

v INVENTOR. 5 C3464 0. 55:: w/v. ZYza 5 BY Z Z I 1 Z V ATTORNEY.

c. D; BROWN v 2,187,814

ADJUSTABLE HARNESS MECHANISM Filed July 19. 1939 Patented Jan. 23, .1940

PATENT OFFlC E.

ADJUSTABLE HARNESS MECHANISM.

Carl D. Brown, Hope dale, Mass, assignor' to Draper Corporation, Hopedal'e, Mass., a corporation of Maine Application July 19, 1939, Serial No. 285,223

9 Claims,

The present invention. pertains to cam and treadle harness mechanisms for looms, andmore particularly relates to the'construction and ar-- rangement of such mechanisms whereby the f. throw of the treadles thereof is rendered adjustable.

Loomsof the type to which my invention applies commonly include harness frames, harness treadles connected to the harness frames for operating the latter, harness cams for operating the treadles, and fulcrum means on which the treadles pivot. It is highly desirable that the throw of the treadles be adjustable, to provide different shed openings without changing the harness cams, Numerous constructions for this purpose have been proposed heretofore, butonly one such prior construction has proven to, be at all practicalv and that construction is somewhat zmcre expensive than is desired.

v It is accordingly a principal object of the present invention to provide a loom having a harness frame, harness treadle and harness cam asafcresaid, and simple, inexpensive fulcrum means arranged to permit adjustment of the throw of the treadle, which means shall comprise spaced fulcrum members arranged to each provide the fulcrum for the treadleduring a different portion of each oscillationof the treadle, and which members shall be relatively, adjustable, for the purpose. aforesaid, as hereinafter described and claimed.

The foregoing and other objects of the invention are,accomplished in the construction illustrated onthe accompanying drawings, of which:

Fig. 1 is a view, partly in elevation and partly in section, of a loom having the preferred embodiment of my invention applied thereto;

Fig. 2 is a. view partlyinplan and partly, in section taken on line 2--2 of Fig. 1, but with parts omitted;

r Fig. 3 is a diagrammatic view illustrating the operation of the said preferred embodiment;

Fig; 4 is a diagrammatic view showing a modified form of the invention; and I t Fig. 5 is a View similar to Fig. 4 but showing a further modified form of the invention. M

The loom shown on the drawings is provided with my novel adjustable harness mechanism, but is otherwise of conventional construction. The loom is accordingly but fragmentarily illustrated; the. conventional parts shown including only the right hand loom side l,, across girt 2, the-crank shaft 3, camshaft 4, and certain parts of, the harness mechanism. The conventional parts of l the harness mechanism 'include the harness frames 5 These frames are positioned one in front of the other and extend widthwise of the loom in substantially parallel vertical planes. The harness frames. are moved vertically to form theshed opening, asis well known in the; art. To this end, the harness frames may be connected to the forward'ends of harness treadles 6 (of novel construction) by any suitable usual connections such as straps l.

The treadles 6 extend forwardly and rear wardly of the loom, approximately horizontally, with their forward ends located below theharness frames 5. There is one treadle for each harness frame and the forward ends of the. treadles move vertically to move the harness frames. The:-

vertical movement of the harness treadles is effected by the usual harness cams 8, therearward ends of the treadles being fulcrumed as hereinafterdescribed. The harness cams 8 "are fixed on a shaft 9 which is locatedrearwardly of the planes of the harness frames and above the treadles 6 intermediate the ends. of the latter. The shaft 9 is driven from the cam shaft 4 as usual, the revolving cams I engaging rolls Hi on the treadles.

The size of. the-shed opening formed by the" harness mechanism must vary with different weaving conditions and, to avoid changing the harness cams, it is desirable that'the throw of the treadles be adjusted by other means. I .hav'e accordingly provided a novel and improved means for adjusting the fulcrum of the treadles.

, In accordance with the present invention, Iprovide two separate-fulcrum members located different distances from the harness cams and arranged so that the treadle in each of its oscillations alternately rocks on first. one of the fulcrum 1 members and then the other thereof, and one of. the fulcrum members is adjustable to vary a the throw of the treadle.

members shown consist of parallel bars II and 12 which extend transversely. of all of thetreadles rearwardly from the harness cams 8. The bar H is fixed in brackets I3 on the girt 2 and is so located that, it engages a longitudinal surface The slots l5 are arcuate, with their centers sub" stantially coinciding with the upper or fulcrum surface of bar II. The ends of. the bar [2 are fixed in slots IS in the brackets I3, which slots are curved. parallel to the arcuate slots. l5 so that 55 40 g In. the'embodiment of Figs. 1-3, the fulcrum the bar may be adjusted along the arc of the slots. The bar i 2 is fixed in adjusted position by nuts IT.

The fulcrum bars II and I2 are spaced apart longitudinally of the treadles 6 and are spaced different distances from the harness cams 8. The bars are so arranged that when a harness treadle is up, as shown by Fig. 3, the bar I2 is in engagement with the upper end of the slot 15 and the surface i4 is above or out of engagement with the bar ll. Thus, in this position, the bar l2 engages and acts as the fulcrum for the treadle. Then, as the treadle is forced down wardly the surface l4 engages the fulcrum bar H and the extreme rearward end of the treadle moves upwardly so that the upper end of slot I5 moves out of engagement with the bar I2. In this latter position, the fulcrum bar H engages and acts as the fulcrum for the treadle and the bar l2 and slot l5 serves merely to guide the treadle and prevent longitudinal movement thereof.

The effective length of the harness treadle, and therefore the throw of treadle, is varied as the treadle engages first one and then the other of the fulcrum bars, the total throw being the sum of the movement with bar l2 acting as the fulcrum plus the movement with bar i l acting as the fulcrum. Adjusting the bar l2 transversely of the treadle along slots l 6 varies the relative positions of the bars and the proportion of each oscillation of the treadle during which the bar l2 acts as the fulcrum, and will therefore vary the total throw of the treadle. Among the many advantages of this construction are simplicity and sturdiness of construction, ease of adjustment, and a decided reduction in forward and backward movement of the harness frames. On this latter feature, it will be noted that the forward end of the treadle moves along an arc the horizontal component of which constitutes said forward and backward movement, but that this component is appreciably smaller in the construction shown than it would be if either fulcrum bar were omitted.

The embodiments shown by Figs. 4 and 5 include the same harness frames and strap connections as in the first embodiment above described and a showing of these parts is accordingly not repeated. The harness treadles of Figs. 4 and 5 are located the same as in the first embodiment and are operated by the same harness cams 8 on shaft 9 and engaging rolls ill on the treadles. The treadle i8, Fig. 4, has a longitudinal surface IS on the lower edge of its extreme rearward portion, which surface is adapted to engage a fulcrum member or bar 20 during a portion of each oscillation of the treadle. This treadle also has an arcuate slot 2| receiving a fulcrum bar 22. The center of curvature of the slot 2| approximately coincides with the fulcrum surface of bar 20.

The fulcrum bars 20 and 22 are so arranged as to alternately engage and act as the fulcrum for the treadle l8, and the slot 2| guides the treadle and prevents longitudinal movement thereof, all as in the above embodiment. In this embodiment, however, the bar 22 is fixed in predetermined position and the bar 20 is made adjustable, Preferably, the bar 20 is adjustable horizontally, longitudinally of the treadle along the surface I9, as indicated by dotted circles 29' and 20". Supporting brackets and adjusting means for fulcrum bars may be similar to the corresponding parts previously described except for obvious modifications. Such brackets and adjusting means are accordingly not shown on Fig. 4.

In the embodiment shown on Fig. 5, a treadle 23 has a longitudinal surface 24 on its lower edge engaging a fulcrum bar 25 and is provided at its rearward end with an arcuate slot 26 for receiving a fulcrum bar 21. The treadle 23 is thus identical in every respect with the treadles 6 above described. In the present instance, however, the bar 2'! is fixed in predetermined position and the bar 25 is adjustable vertically as at 25 and 25". Obvious changes in the supporting brackets and adjusting means will likewise be required for this embodiment. The location of the parts and operation of the mechanism are, of course, substantially the same as in the previous embodiments. The advantages of the embodiments of Figs. 4 and 5 are substantially the same as for the embodiment of Figs. 1-3 and need not be repeated.

Having fully disclosed the preferred embodiments of my invention, I claim:

1. In a loom, a harness frame, a harness treadle connected with said harness frame for operating the latter, a harness cam for operating said treadle, spaced fulcrum members arranged to alternately act as the fulcrum for said treadle during each oscillation of the latter, and means for adjusting one of said fulcrum members relative to the other to thereby adjust the throw of 530 said treadle,

2. In a loom, a harness frame, a harness treadle, means connecting said treadle with said harness frame for operating the latter, a harness cam for operating said treadle, spaced fulcrum 5 members each arranged to engage and act as the fulcrum for said treadle during a different portion of each oscillation of the treadle, and means for adjusting the throw of said treadle, the last said means comprising means for adjusting the relative positions of said fulcrum members.

3. In a loom, a harness frame, a harness treadle, means connecting said treadle with said harness frame for operating the latter, a harness cam for operating said treadle, a fulcrum mem-" ber arranged to engage and act as the fulcrum for said treadle during only a. portion of each oscillation of the treadle, a second fulcrum member spaced from the first said fulcrum member and arranged to engage and act as the fulcrum for said treadle during the remaining portion of each said oscillation of the treadle, said fulcrum members being spaced different distances from said cam, and means for adjusting one of said fulcrum members relative to said cam to thereby adjust the throw of said treadle.

4. In a loom, a harness frame, a harness treadle, means connecting said treadle with said harness frame for operating the latter, a harness cam for operating said treadle, a pair of fulcrum members spaced apart longitudinally of said treadle, said fulcrum members and treadle being so arranged that said treadle engages and rocks on first one and then the other of said fulcrum members during each oscillation of the treadle, and means for adjusting the throw of said treadle, the last said means comprising means supporting one of said fulcrum members for adjustment relative to the other of said members.

5. In a loom, a plurality of harness frames, a plurality of harness treadles extending forwardly and rearwardly of the loom with their forward ends positioned beneath said harness frames, means connecting said forward ends of said treadles with said harness frames, harness cams acting on said treadles intermediate their ends,

a pair of parallel fulcrum bars vextending transversely of said treadles adjacent the rearward ends thereof, said fulcrum bars and treadles buing so arranged that said'treadles engage and rock on first one and then the other of said bars during each oscillation of the treadles, said bars being spaced different distances from said cam,

and means for adjusting one of said bars relative to the other thereof to thereby adjust the throw of said treadles.

6. In a loom, a substantially vertical harness frame, a harness treadle extending forwardly and rearwardly of the m with its forward end beneath said harness frame, means connecting the forward end of said treadle with said harness frame, a harness cam acting on said treadle intermediate the ends thereof, a pair of parallel fulcrum bars extending transversely of said treadle adjacent the rearward end of the latter, said bars being spaced apart longitudinally of said treadle and being arranged to each engage and act as the fulcrum for said treadle during a different por-- tion of each oscillation of the latter, and means for adjusting one of said bars longitudinally of the treadle to thereby adjust the throw of the treadle. v

7. In a loom, a substantially vertical harness frame, a harness treadle extending forwardly and rearwardly of the loom with its forward end beneath said harness frame, means connecting the forward end of said treadle with said harness frame, a harness cam acting on said treadle intermediate the ends thereof, a fulcrum bar extending transversely of said treadle adjacent the rearward end thereof and arranged to engage and act as the fulcrum for said treadle during only a portion of each oscillation of the treadle, a second fulcrum bar parallel to but spaced longitudinally of the treadle fromthe first said bar, said second bar being arranged to engage and act as the fulcrum for said treadle during the remaining portion of each said oscillation, and means for adjusting one of said bars vertically to thereby adjust the throw of said treadle.

8. In a loom, a harness frame, a harness treadle connected with said harness frame for operating the latter, a harness cam for operating said treadle, transverse fulcrum bars spaced apart longitudinally of the treadle'and arranged to alternately act as the fulcrum for said treadle during each oscillation of the latter, saidtreadle having an arcuate slot the center of which substantially coincides With one of said bars and the other of said bars extending through said slot to prevent longitudinal movement of the treadle, and means for adjusting one of said bars relative to the other to thereby adjust the throw of said treadle.

9. In a loom, a substantially vertical harness frame, a harness treadle extending forwardly and rearwardly'of the loom and having its forward end positioned beneath said harness frame, means connecting said forward end with said harness frame, a harness cam acting on said treadle intermediate its ends, a fulcrum bar extending transversely of said treadle, said treadle having a longitudinal surface on its lower edge adjacent its rearward end and said surface engaging said bar during a portion of each oscillation of the treadle, said treadle having an arcuate slot the center of which substantially coincides with said fulcrum bar, a second fulcrum bar extending through said slot, said second bar being parallel to the first said bar and being arranged to engage the upper end of said slot and thereby act as the fulcrum for said treadle during the remaining portion of each said oscillation, and means for adjusting one of said bars relative to the other thereof to thereby adjust the throw of said treadle.

CARL D. BROWN.

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