US3796235A

US3796235A - Harness arrangement for a loom

Info

Publication number: US3796235A
Application number: US00246416A
Authority: US
Inventors: J Muller
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-04-23
Filing date: 1972-04-21
Publication date: 1974-03-12
Anticipated expiration: 1991-03-12
Also published as: DE2217091C3; DE2217091B2; GB1385124A; CS176189B2; CH523987A; DE2217091A1

Abstract

Two horizontal parallel heddle rails connected by heddles have center portions secured to a single vertical supporting rod whose lower end is engaged by an oscillating cam follower so that the heddle rails and heddles are reciprocated with the single supporting rod. The ends of the heddle rails are preferably guided in vertical grooves of stationary vertical guide bars.

Description

[ 1 HARNESS ARRANGEMENT FOR A LOOM [76] Inventor: Jakob Miiller, 5262 Frick,Aargau,

Switzerland [22] Filed: Apr. 21, 1972 [21] Appl. No.: 246,416

[30] Foreign Application Priority Data Apr. 23, 1971 Switzerland 5914/71 [52] US. Cl 139/79, 139/82, 139/91 [51] Int. (11...... D03d 5/00, D030 9/06, D030 13/00 [58] Field of Search 139/78, 79, 82, 57, 58, 139/91, 92

[56] References Cited UNITED STATES PATENTS 3,752,194 .8/1973 Griffith 139/79 3,693,667 9/1972 Arnold 139/91 2,510,404 6/1950 Lake et a1 139/82 3,603,351 9/1971 Piazzolla 139/79 3,695,304 10/1972 Menegatto 139/78 2,944,571 7/1960 Pfarrwaller 139/91 3,020,930 2/1962 Pfarrwaller 139/82 96,564 11/1869 Duckworth.... 139/58 X 993,685 5/1911 Holmes 139/91 3,169,555 2/1965 Koyder et a1. 139/91 FOREIGN PATENTS OR APPLICATIONS 388,216 6/1965 Switzerland 139/82 629,502 7/1927 France 139/82 Primary Examiner,lames Kee Chi Attorney, Agent, or FirmMichae1 S. Striker [5 7] ABSTRACT Two horizontal parallel heddle rails connected by heddles have center portions secured to a single vertical supporting rod whose lower end is engaged by an oscillating cam follower so that the heddle rails and heddles are reciprocated with the single supporting rod. The ends of the heddle rails are preferably guided in vertical grooves of stationary vertical guide bars.

7'Claims, 6 Drawing Figures PATENTEB WAR 1 2 I974 SHEET 2 OF 2 .4. J l L HARNESS ARRANGEMENT FOR A LOOM BACKGROUND OF THE INVENTION It is known that in looms for weaving one, or several bands or ribbons simultaneously, the heddles are mounted on heddle rails which are arranged in a harness frame. The disadvantage of prior art apparatus is the great weight of the harness frames. In order to obtain high weaving speeds, it is of greatest importance that the weight of the harness frames is low. Another disadvantage of the harness frames according to the prior art is that the vertical supporting rods, which also serve as guides, are spaced far from each other. As a result, the harness frames cannot be accurately guided during reciprocation, and a jamming or edging of the harness frame may occur.

SUMMARY OF THE INVENTION It is the object of the invention to overcome the disadvantages of the harness arrangements of known looms, and to provide a harness arrangement which has low weight and inertia, and does notedge or jamm in guide means.

Another object of the invention is to provide a harncss arrangement which can be reciprocated at very high speed.

With these objects in view, the present invention provides a single reciprocated supporting rod, to which at least two heddle rails are secured, extending perpendicularly to the supporting rod.

The supporting rod is directly engaged by the drive means and reciprocated in a vertical direction, also serving as a guide rod, and the possibility of jamming of a harness frame in guide means is eliminated.

Preferably, a supporting rod consisting of a profile bar is used so that the weight of the supporting rod is reduced while the supporting bar nevertheless has high rigidity. It is advantageous to mount the heddle rails on the supporting rod by clamping attaching means, so that the worn heddle rails can be exchanged.

In the preferred embodiment, the drive means include an oscillating cam follower lever engaging a first portion of the supporting rod for moving the supporting rod and heddle rails in a first stroke, and a second portion engaged by a spring. The first and second portions are spaced transversely to a plane passing through the supporting rod and the heddle rails so that a turning moment acts on the supporting rod and the heddle rails against the force exerted by warp threads moving through the heddles, so that friction is reduced.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a front view of an embodiment of the invention;

FIG. 2 is a side view of the harness arrangement illustrated in FIG. 1;

FIG. 3 is a fragmentary schematic front view illustrating a modification of the embodiment of FIG. 1;

FIG. 4 is a fragmentary schematic plan view of the modified embodiment of FIG. 3;

FIG. 5 is a fragmentary schematic front view illustrating another modification of the embodiment of FIG. 1; and

FIG. 6 is a fragmentary schematic plan view of the modification shown in FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1 and 2, a vertical supporting rod 1, which has U-shaped cross section, supports two horizontal heddle rails 2 connected by heddles 4 which have loops at the ends through which the heddle rails 2 pass. The upper heddle rails 2 is slightly wider than the lower heddle rail 2 so that the upper loops of the heddles 4 surround the heddle rails 2 almost without play.

The center portions of the two heddle rails are secured to the supporting rod 1 by U-shaped clamps 3 and screws, not shown, permitting a detachment of worn heddle rails 2, and replacement by new heddle rails. The clamps 3 are located within the opening formed by the legs of the U-shaped supporting rod 1. A pair of guide bars 10 is provided with longitudinal grooves in which the free ends of the heddle rails 2 are The lower end of supporting rod 1 carries a bracket 5 with lateral walls 5a between which

pins

6 and 6a are mounted. A spring 9 is secured to pin 6a and to the base 15, and since the

pins

6 and 6a are spaced from each other transversely to a plane passing through the supporting rod 1 and the heddle rails 2, the forces applied on pin 6 by the driven lever 7 and on pin 6a by the spring 9, produce a turning moment tending to turn supporting rod 1 with heddle rails 2 and heddles 4 in a direction which is opposite to the direction of the force applied to the heddles 4 by warp threads 14 moving through the heddle eyes in the direction of arrow X. In this manner, friction, particularly of the free ends of the heddle rails 2 in the vertical guide bars 10 is reduced.

FIGS. 3 and 4 show a modified construction in which instead of the grooved guide bars 10, several guide blocks l0, 10" with grooves 100 are provided. By guiding the outer ends of the heddle rails 2, vibrations of the supporting rod 3 are prevented even at high operational speeds.

The modification of FIGS. 5 and 6 includes vertical slide rods 11 secured to the ends of the two heddle rails 2 and being guided in corresponding grooves 12a of guide members 12. Slide rods 11 are preferably detachably secured to the heddle rails 2, and increase the rigidity of the heddle rails 2.

If it is necessary to provide heddle rails 2 of very great length, a connecting rod 13 can be secured to the heddle rails 2 and increases the stiffness and rigidity of the heddle rails 2.

During operation, shaft rotates cam 8 so that follower lever 7 is reciprocated and raises by engagement of pin 6, supporting rod 1 with heddle rails 2 and heddle rails 4 so that the warp threads passing through the eyes of the heddles 4 are raised to form a shed. When the angular position of cam 8 permits turning of cam follower lever 7 in counterclockwise direction about pivot 7a, the spring 9 pulls bracket 5 with supporting rod ll down so that the heddle rails 2 also move downwardly with heddles 4 and the warp threads 114 passing through the same. A slight turning moment in clockwise direction is exerted by lever 7 and spring 9 on bracket 5 and supporting rod 1 to urge the heddle rails 2 toward the right as viewed in FIG. 2 to oppose the pull of the warp threads 14 passing through the eyelets of the heddles 4 in a direction of the arrow X.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of harness arrangements differing from the types described above.

While the invention has been illustrated and described as embodied in a harness for a ribbon loom having a single reciprocating supporting rod, and at least two horizontal heddle rails secured to the supporting rod, and being reciprocated by drive means, it is not in tended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.

I claim:

1. A harness arrangement for a loom comprising a single supporting rod; at least two heddle rails extending perpendicularly to said supporting rod spaced from each other along said supporting rod, and having cen' tral portions secured to said supporting rod and outer ends; heddles extending between said heddle rails and having end portions attached to said heddle rails; a pair of elongated stationary guide means parallel with said supporting rod and slidingly engaging said outer ends of said oajsKd heddle rails for guiding said heddle rails with said supporting rod; drive means connected with said supporting rod for reciprocating said supporting rod in longitudinal direction with said two heddle rails while said outer ends thereof are guided by said stationary guide means, said drive means including a driven reciprocating member engaging a first portion of said supporting rod for moving said supporting rod in a first stroke in one longitudinal direction, and a spring means engaging a second portion of said supporting rod for moving said supporting rod in a second stroke in the opposite longitudinal direction, said first and second portions being spaced transversely to a plane passing through said supporting rod and said heddle rails so that a turning moment acts on said supporting rod and said heddle rails and heddles, reducing the friction between said outer ends of said heddle rails and said stationary guide means.

2. Harness arrangement as claimed in claim 1 comprising two slide rods secured to said ends of said heddle rails and being guided by said elongated guide means during reciprocating movement.

3. Harness arrangement as claimed in claim 2 wherein said elongated guide means are guide bars having longitudinal grooves slidably receiving said slide rods for guiding said heddle rails and supporting rod during reciprocating movement.

4. Harness arrangement as claimed in claia 1 wherein said first and second portions of said supporting rod are first and second pins transverse to said supporting rod and parallel to said heddle rails; and wherein said drive means include a reciprocating cam follower cooperating with said first pin.

5. Harness arrangement as claimed in claim 1 wherein said end portions of said heddles are loops receiving said heddle rails; and wherein at least the loops on one of said heddle rails fits on said heddle rails so that said heddles reciprocate with said heddle rails almost without play.

6. Harness arrangement as claimed in claim 1 including at least one reinforcing rod detachably connecting said heddle rails spaced from said ends, and being parallel to said supporting rod.

7. Harness arrangement as claimed in claim 1 comprising attaching means for securing said center portions of said heddle rails detachably to said supporting

Claims

1. A harness arrangement for a loom comprising a single supporting rod; at least two heddle rails extending perpendicularly to said supporting rod spaced from each other along said supporting rod, and having central portions secured to said supporting rod and outer ends; heddles extending between said heddle rails and having end portions attached to said heddle rails; a pair of elongated stationary guide means parallel with said supporting rod and slidingly engaging said outer ends of said oajsKd heddle rails for guiding said heddle rails with said supporting rod; drive means connected with said supporting rod for reciprocating said supporting rod in longitudinal direction with said two heddle rails while said outer ends thereof are guided by said stationary guide means, said drive means including a driven reciprocating member engaging a first portion of said supporting rod for moving said supporting rod in a first stroke in one longitudinal direction, and a spring means engaging a second portion of said supporting rod for moving said supporting rod in a second stroke in the opposite longitudinal direction, said first and second portions being spaced transversely to a plane passing through said supporting rod and said heddle rails so that a turning moment acts on said supporting rod and said heddle rails and heddles, reducing the friction between said outer ends of said heddle rails and said stationary guide means.

7. Harness arrangement as claimed in claim 1 comprising attaching means for securing said center portions of said heddle rails detachably to said supporting bar.