US3749137A

US3749137A - Drive for producing movement of the lay in weaving looms

Info

Publication number: US3749137A
Application number: US00209993A
Authority: US
Inventors: H Jager
Original assignee: JAEGER E KG
Current assignee: JAEGER E KG; JAGER E KG DT
Priority date: 1971-01-15
Filing date: 1971-12-20
Publication date: 1973-07-31
Anticipated expiration: 1990-07-31
Also published as: FR2121587A1; IT946549B; SE366349B; GB1350181A; DE2101720A1; DD97229A5

Abstract

For producing greater retardation at the outer dead end of the movement of a lay, a double lever system includes links pivoted to each other with one pivoted to the lay and the other to the loom frame. The second link forms one arm of an angle member, each arm of which carries a roller engaging one of two cam discs. The pivot point between the links can be adjusted to produce single or double strokes.

Description

United States Patent 1 July 31,1973

J agei- [54] DRIVE FOR PRODUCING MOVEMENT OF 2,624,372 1/1953 Budzyna et al. 139/190 THE LAYIN WEAVING LOOMS 3,384,130 5/1968 Golobart 139/190 [7 5] Inventor: Hans Jiiger, Munster, Germany FOREIGN PATENTS OR APPLICATIONS 73 Assignee; EmflJager KG Munster G y 560,993 5/l944 Great Britain 139/190 [22] Filed: 1971 Primary Examiner-James Kee Chi [21] Appl. No.: 209,993 Att0rneyJennings Bailey, Jr.

[] Foreign Application Priority Data Jan. 15, 1971 Germany ..P 21 01 720.9 [571 ABSTRACT I For producing greater retardation at the outer dead 52 U.S. Cl. 139 190 end of the movement of a a dQuble lever system Int Cl l I Dosd 4/9/60 cludes links pivoted to each other with one pivoted to [58] Field of 's'e' rcijff. i 3 9/1 191 10s the lay and the the The secmd 5 link forms one arm of an angle member, each arm of which carries a roller engaging one of two cam discs. [56] Reerences Cited The pivot point between the links can be adjusted to UNITED STATES. PATENTS produce single or double strokes. 2,399,728 5/1946 Fletcher 139 10 Claims, 6 Drawin Figures 1,980,527 ll/l934 Hewton 139/190 X Patented July 31, 1973 3,749,137

6 Sheets-Sheet 1 FIG] Patented July 31, 1973 6 Sheets-Sheet 2 FIGZ Patented July 31, 1973 3,749,137

6 Sheets-Sheet 5 FIG. 3

Patented July 31, 1973 3,749,137

6 Sheets-Sheet 4 Patented July 31, 1973 6 Sheets-Sheet 5 FIGS Patented July 31, 1973 3,749,137

6 Sheets-Sheet (5 FIGS DRIVE FOR PRODUCING MOVEMENT OF THE LAY IN WEAVING LOOMS BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a drive for movement of the lay, especially for wire looms and looms for the manufacture of heavy thick fabrics, which require a large stroke force, in which the movement of the thread is accomplished through a double lever system driven by an eccentric and pivoted on one hand to the lay and on the other hand to the stand.

2. The Prior Art In weaving it is necessary to retard or even interrupt the movement of the lay to permit the drawing in of the filler threads or wires in the rear dead center position. In the known wire looms a retardation of the movement of the lay is accomplished with the help of a driven connecting rod engaging a two armed lever (German patent Nos. 286,080 and 204,870. In this arrangement the drive allows in the faster running web looms of the present day insufficient time for the introduction of the weft threads or wires. Besides the running cycle is not satisfactory.

Cam drives for looms'are also known, which however do not provide the necessary high force for the manufacture of heavy thick webs. The known cam drives are besides subject to very quick wear.

SUMMARY OF THE INVENTION The purpose of the invention is to provide a drive for looms for heavy thick webs such that even during faster operation of the loom a sufficient retardation or interruption of the thread movement sufficient for the introduction of the weft thread or wire is achieved.

The purpose according to the invention is achieved in that, in a drive of the previously known type as an eccentric drive, a driven cam is selected which exerts a positive force on a connecting rod, for example pivoted on the stand, forming part of the double lever system.

The drive according to the invention has a very great lay rest period, which as compared to the rest period which can be achieved with the known drive lies in the range of about 120. The greater rest period results even in a fast running loom in a trouble-free transfer of the weft threads or wires.

Basically the combination of a double-lever system and a driven cam as a drive for the movement of the lay provides the necessary high stroke force and the protection of the cam drive during stopping. With this type of drive it is also possible to have a satisfactory operating cycle. The leg of the double-lever system connected to the lay can be constructed in a known manner as a link, with which the leg of a guide crank directed towards the double-lever system engages.

If a so-called groove or a so-called path cam is used, it is necessary to arrange on the rear link of the doublelever system as a roller engaging the cam. On the contrary with curved discs under certain circumstances it is possible to use a sliding member of bronze or of a suitable plastic.

It is possible to produce the return movement of the lay by means of tension elements such as a tension spring. In this case only one cam cooperating with the connecting rod pivoted on the stand is used.

A special construction according to the invention is an angle piece on the leg of the double-lever system which is pivoted to the stand, the free ends of which engage against two different cams, one of which works on the lay stop cam which operates on the leg of the single piece system adjacent the double-lever system while the other cam which engages the other leg for the return movement.

Especially in wire weaving it may be necessary to work with a so-called double stroke. This double stroke can be realized with the drive according to the invention, by making the connecting bolts of the doublelever system connecting rod displaceable with respect to the extended position of the double-lever system out of the previously mentioned connecting line between the lay link and the stand link beyond the extended position. If the drive is provided with an arrangement of connecting bolts at the level of the aforesaid connec tion line between the lay link and the stand link in the extended position of the bell crank lever link, the basic stroke is achieved. If the connecting bolt on the contrary is moved upwardly beyond the connecting line, there results in this arrangement the double stroke sought for, which results in the repeated cycle of the extended position of the double-lever system in a single cycle of the cam which produces the movement of the lay.

Single and double strokes can also be realized if an adjustability of the roller adjacent to the double action lever system link with respect to the cam is provided, in which the use of an angle piece as the connecting rod of the double action action lever system connected to the stand requires additionally an adjustability of the position of the legs of the angle piece with relation to one another, in order to ensure and maintain an engagement of the roll on the cam discs without play, even with eccentric positioning of the rolls. The adjustability of the position of the arms of the angle piece remains constant, if the roll is centrally journalled and is provided for their axes in the arms of angle piece slots on a radius of the stand link through the ideal axis point.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, the invention is further explained in schematic examples.

In the drawings:

FIG. 1 shows a drive arrangement for a single stroke in the rear dead center;

FIG. 2 shows the same drive in theforward dead center;

FIG. 3 shows a drive arrangement for double stroke in the rear dead center position;

FIG. 4 shows the system in the forward dead center position;

FIG. 5 shows such a system in the position where it has advanced over the forward dead center position; and

FIG. 6 shows such a system in the position diametrically opposite the position of FIG. 5 in the forward dead center position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, 11 is the web lay, which is pivoted at 12 on a web lay base and is swingable in the direction of the arrow.

The swinging movement of the lay 11 is produced through the

double lever system

13, 14, 14 of which the lever 13 is pivoted at 16 at the free end of the lay 11 and the other lever 14, 14' at 17 on the loom frame, in connection with the driven double cam 19, 19' of which the roll 141 mounted on the lever arm 14 engages the cam 19 forces the lay 11 into the forward dead center position (FIG. 2) while the roll 141' arranged on the lever arm 14 engages cam 19 which positively forces the lay 1 l to the rear dead center positlOn.

The

roller

141 and 141 are so arranged with respect to each other that they engage without play against the cam 19 and 19' which are secured to each other.

The lever 13 and the angle lever 14, 14' which make up the crank lever system are connected by a bolt 21, which engages through slots 22 provided in the lever 13 and in the lever arm 14 in the bell crank lever 14, 14' and can be secured at various positions therein.

With the arrangement as shown in FIGS. 1 and 2, the connecting bolt 21 at the lower ends of the slots 22 operates the loom with a so-called single stroke. In the forward dead center position (FIG. 2) the pivot 16, the pivot 22 and the pivot 21 lie in the same plane, from which the return to the rear dead center position (FIG. 1) follows.

With the arrangement as shown in FIGS. 3 to 6, the connecting bolt 21 at the upper ends of the slots 22 operates the loom with a so-called double stroke. In this condition the

double lever system

13,14,14' operates, beginning from a rear dead center position (FIG. 3), first the forward dead center position (FIG. 4) where the lay 11 stops a first time, then the

double lever system

13,14,14 swings over the extended position of the lever 13 and the lever arm 14 (the plane defined by the

pivots

16,21, 17) on beyond by the distance x (FIG. whereby the lay 11 is drawn back to the corresponding piece, whereas the lever 13 and the lever arm 14 procccd further to the dead center position (FIG. 6), wherein a second stoppage of the lay 11 occurs. Then follows further the return movement into the rear dead center position (FIG. 3).

I claim:

1. In combination with a loom frame and a lay pivoted on said frame, a drive mechanism comprising a double lever system including two links, means pivotally connecting the links together at one end, means pivotally mounting a first of the links on the lay and the second link on the frame for movement between a first position in which the links are substantially aligned with each other and a second position in which they form a substantial angle with each other, and eccentric drive means for one of the links including means to exert a positive force on such link to produce movement of the lay.

2. A device as claimed in claim 1 in which said eccentric drive means comprises a disc cam.

3. A device as claimed in claim 1 including means to exert a force acting in the opposite direction from said eccentric drive means.

4. A device as claimed in claim 1, having a part secured to said second link and extending at an angle thereto, and second eccentric drive means for said second link operating on said part to exert a force thereon to produce movement of the lay in the opposite direction from that produced by the first link.

5. A device as claimed in claim 5 in which each of said force exerting means includes a disc cam.

6. A device as claimed in claim 5, in which said second link and said part have rollers thereon engaging the disc cams.

7. A device as claimed in claim 1, in which said means pivotally connecting the links includes a bolt and said links have slots transverse to the line joining their pivot axes and said bolt is adjustable in said slots.

8. A device as claimed in claim 7 including means to exert a force acting in the opposite direction from said eccentric. drive means.

9. A device as claimed in claim 7, having a part secured to said second link and extending at an angle thereto, and second eccentric drive means for said second link to produce movement of the lay in the opposite direction from that produced by the first link.

10. A device as claimed in claim 9 in which each of said force exerting means includes a disc cam.

i i l i

Claims

8. A device as claimed in claim 7 including means to exert a force acting in the opposite direction from said eccentric drive means.