KR20220160498A - Shed forming machine - Google Patents

Abstract

According to the present invention, a shed forming machine comprises: an output lever (14) oscillating about a common shaft (22) centered on a longitudinal axis (A22); a cover; a frame; and sealing devices (40, 52, 54). The sealing devices (40, 52, 54) include sealing struts stacked along the common shaft, and at least one seal (52, 54). Each of the ceiling struts includes a band (402) and an inner radial edge. The seals (52, 54) extend in a main direction parallel to the longitudinal axis (A22) of the common shaft (22) and abut on a fixed part of a machine. In addition, each of the ceiling struts (40) is provided with at least one groove (416, 436) extending parallel to a primary axis (A40) and open on each side surface of the ceiling strut. The grooves of the sealing struts of the sealing devices (40, 52, 54) together form channels (G2, G4) for receiving a heel of the seal.

Description

Shed Forming Machine {SHED FORMING MACHINE}

The present invention relates to a mechanical cam or dobby type shed forming machine for a weaving machine.

In the field of weaving, shed forming machines are used which drive assemblies of levers and connecting rods, moving parallel to each other according to a predetermined weave, forming a drawing mechanism for the frames of the loom. it is known

Shed forming machines may be formed by a cam mechanism comprising several cams driven rotationally by a main shaft, each of which has two rollers on which two separate rollers rest, supported by a lever (most often called an output lever). Define composite tracks. Each output lever includes a lever arm to which one of the rods of the drawing mechanism is attached. The output levers are provided in a number equal to the number of held frames of the loom and are mounted for reciprocating oscillation about a common shaft defined by the mechanical frame.

The shed forming machine may consist of a rotary dobby with internal connecting rods belonging to oscillating rod/lever assemblies controlled by eccentric-shaped actuating elements. These operating elements are mounted on the main shaft of the dobby driven by intermittent rotational motion. A selection device makes it possible, at the level of each dobby blade, to connect or not connect the actuating element with the main shaft, depending on the weave to be obtained in the fabric being woven, through which it can drive or not drive the drawing mechanism. let it be The part of each actuating element connected with the draw-off constitutes an output lever for inversion.

Irrespective of the type of shed forming machine, the outflow opening of this machine is considered to consist of a cutout placed in the cover of the machine through which the output levers pass, within the machine's internal volume, being contained between the frame and the machine cover. The remaining part contains an oil bath for lubrication of the mechanically moving components of the machine.

The high-speed movement of some moving output levers in the oil bath is likely to create oil splashes on the outside of the machine. The oil present in the internal volume of the machine must not come out of the machine to avoid the risk of contaminating the fabric or contaminating the machine environment during manufacturing.

On the other hand, the shed forming machine may be equipped with a variable number of output levers, depending on the number of frames of the loom involved. Under these conditions, the sealing device for closing the outflow opening of the shed forming machine must be compatible with different output lever distributions.

It is known to limit oil splashing out of the internal volume of the shed forming machine using sealing struts mounted around the common shaft of the output levers. Accordingly, EP-A-3,162,933 teaches the mounting of sealing barriers formed by seals on adjacent sealing struts. This solution is generally satisfactory and significantly limits the oil splashing through the machine's outflow opening. However, the sealing around the cover and frame of the shed forming machine is achieved through profiles that must be precisely manufactured and fitted, which is costly and time consuming. Also provided is the use of seals that fit around the struts, which may be expensive and complex to implement.

The present invention seeks to remedy these disadvantages by proposing a novel shed forming machine, more specifically in which the sealing at the outflow opening through which the oscillating output levers pass is improved by an economical and reliable approach.

To this end, the present invention relates to a mechanical cam or dobby type shed forming machine for a loom, said machine comprising:

- output levers oscillating about a common shaft centered on a longitudinal axis;

- a cover forming an outlet opening through which the output levers pass;

- a frame forming, together with the cover, the internal volume of the machine; and

- a sealing device intended for closing the cover outflow opening, said sealing comprising sealing struts and at least one seal stacked along a common shaft and arranged on opposite sides of the output levers; include the device

Each ceiling strut,

- extending from a first end located near the frame to a second end located near the cover, orthogonal to the longitudinal axis of the common shaft and configured to abut at least one longitudinal edge of a band of adjacent ceiling struts; a band comprising two longitudinal edges which are; and

- an inner radial edge defining a common shaft passage opening centered on a primary axis coinciding with the longitudinal axis of the common shaft at least when the machine is in a weaving configuration;

According to the present invention,

- the seal extends in a main direction parallel to the longitudinal axis of the common shaft and abuts the stationary part of the machine;

- each ceiling strut is provided with at least one groove extending parallel to the primary axis and opening on each side of the ceiling strut;

- The grooves of the sealing struts of the sealing device together form a channel for receiving the heel of the seal.

According to the present invention, the seal can be mounted as close as possible to the stationary part of the machine, regardless of whether it is a frame or a cover, through various grooves of the sealing struts. The seal can have a relatively simple shape and is easy to mount, which is advantageous in terms of economy and manufacturing speed. In addition, the structure assumed for the sealing struts and seal makes the shed forming machine of the present invention very compact, facilitating maintenance operations.

According to advantageous but not essential aspects of the present invention, such a shed forming machine may include one or more of the following features.

- in a plane perpendicular to the main axis, the groove of each ceiling strut is formed by a bottomed profile whose width is greater than the mouth width;

- the grooves of the sealing struts of the sealing device have the same profile in a plane perpendicular to the main axis;

- the seal has a cross section perpendicular to a given primary direction along the primary direction, and the length of the seal measured parallel to the primary direction is greater than the width of the outflow opening measured parallel to the longitudinal axis of the common shaft; or equal;

- at least one of the sealing struts is a spacer sealing strut, the width of the band of this strut, measured parallel to the main axis between the two longitudinal edges, at the first and second ends is a first value and also has a second value in an intermediate region between the first and second ends covering the angular sector of deflection of the output lever, the first value equal to the division of the shed forming machine, the second value equal to the division of the shed forming machine equal to the division of , minus the thickness of the output lever measured parallel to the longitudinal axis of the common shaft;

- the inner radial edge extends around the major axis over an angular sector having an apex angle strictly less than 180°;

- the sealing device comprises at least one complementary sealing member mounted on the outlet opening and partly housed in the spacer sealing strut in the intermediate region, which complementary sealing member interacts in a sealing manner with the face of the adjacent output lever; , this plane is perpendicular to the longitudinal axis of the common shaft;

- at least one of the sealing struts is an end sealing strut, the width of the band of this strut, measured parallel to the major axis between the two longitudinal edges, from the first end to the second end, shed forming Having a constant value equal to the division of the machine, the ceiling strut comprises centering means for the common shaft;

- Shed forming machine,

- axial stops, on both sides of each output lever, arranged around a common shaft;

- axial fasteners mounted on each end of a common shaft and configured to retain axial stops and output levers on the common shaft;

- at least two bearing rings, each spacer between the axial stop and the axial fastener,

The end sealing struts are mounted around the support rings by means of centering means; In addition

Each of the spacer sealing struts is mounted around the axial stop and each forms a volume for the output lever to pass outwardly through the outflow opening in the middle region of their band.

- each ceiling strut comprises a housing passing along an axis parallel to the main axis, which housing is open on two opposite sides of the ceiling strut and is designed to receive a support shaft;

- The shed forming machine is formed by a longitudinal body parallel to the longitudinal axis of a common shaft and two legs perpendicular to the longitudinal body, each of which forms an articulation bearing of a support shaft. includes a hoop;

- The shed forming machine is of dobby type, and each output lever is driven by an oscillating motion by an internal rod of the machine;

- The shed forming machine is of the mechanical cam type and includes a camshaft parallel to a common shaft, the rotation of which camshaft drives the output levers in an oscillating motion, each strut in a weave position where the output levers are coupled to the camshaft. configured to pivot between a weaving position and a leveling position in which the output levers are disengaged from the camshaft;

- the sealing struts comprise interlocking members configured to hold adjacent struts stacked along a common shaft;

- the ceiling struts comprise overlapping walls between two adjacent ceiling struts when stacked along a common shaft;

- the ceiling struts comprise overlapping walls between two adjacent ceiling struts when stacked along a common shaft;

- the lower receiving channel of the sealing device receives the first seal which abuts the part of the frame facing the cover in the weaving state of the shed forming machine, and the upper receiving channel of the sealing device accommodates the cover facing the frame in the weaving state of the shed forming machine. It accommodates the second seal in contact with the part.

The invention will be better understood and other advantages will become clearer in light of the following description of two embodiments of a shed forming machine according to its principles, given by way of example only and made with reference to the accompanying drawings.
1 is a perspective view of a shed training machine according to the present invention.
Fig. 2 is a perspective view of the shed forming machine of Fig. 1 with output levers in the weave after the cover has been removed and the leveling tool has been placed;
FIG. 3 is a cross-section through the common shaft of the machine in the state of FIG. 2 , in two planes offset along the shaft, shown at inserts A and B, respectively.
FIG. 4 is an enlarged view of Detail IV in the insert B of FIG. 3 .
Figure 5 is a view similar to Figure 3, in the same planes shown for inserts A and B with levers in a leveling configuration.
Fig. 6 is a partial cross-section at a larger scale, according to the VI-VI plane of Fig. 3;
Fig. 7 is an exploded perspective view of the elements shown in section in Fig. 6, excluding two assembly screws;
Fig. 8 is an exploded perspective view of a stack of sealing struts and two seals used in the shed forming machine of Figs. 1 to 7;
Fig. 9 is a plan view and an elevation view from two opposite sides of a spacer strut belonging to the machine of Figs. 1 to 7;
Fig. 10 is a view similar to Fig. 9 for the end struts.
Figure 11 is a view similar to Figure 8 where the shed forming machine includes a different output lever distribution than that of Figures 1-7.

The cam mechanism 2 shown in Figs. 1 to 10 is for driving rods and levers of a drawing mechanism, not shown, which itself drives the frames of the weaving machine according to known technology.

Thus, the cam mechanism 2 constitutes a shed forming machine.

The cam mechanism 2 includes a frame 4 and a cover 6 attached to the frame. The frame 4 and the cover 6 are fixed parts of the cam mechanism 2, and form an internal volume V2 of the cam mechanism 2 between them, and the internal volume V2 is formed by an oil bath. A number of lubricated mechanical members (not shown) are received.

The control shaft 8 is rotationally driven about the longitudinal axis A8 by means of a motor (not shown). Via an angle gear (not shown), this control shaft 8 itself drives the camshaft 10 on which the cams 12 are mounted and supported by the frame 4 . The longitudinal axis of the camshaft around which the shaft rotates when the cam mechanism is operating is denoted by A10. In the example of the drawings, the number of cams 12 is eight. The cams 12 determine the weave made by heald frames driven by the cam mechanism 2 .

A set of four output levers 14 are mounted on the volume V2 and partially protrude from this volume through an outflow opening 16 arranged in the cover 6 . More specifically, each output lever 14 has a central bore 142 in which a roller 18 is mounted and two legs 144 held in place by flanges 20. form Each output lever 14 also includes a lever arm 146 extending generally radially about the central axis of the bore 142 . In the assembled state of the cam mechanism 2, the parts 142, 144 of the output lever 14 as well as their associated rollers 18 and flanges 20 are placed in the volume V2, while A lever arm 146 extends through the opening 16 .

A shaft 22, whose longitudinal axis is indicated by A22, is inserted into the various central bores 142 of the levers 14 and constitutes a common shaft that the levers 14 oscillate when the cam mechanism 2 is operated. do. Axis A10 and axis A22 are parallel.

In the example of the drawings, the cam mechanism 2 is equipped with four levers 14, the volume left by these four levers along a common shaft 22 that can accommodate up to eight levers is 4 It is occupied by two adjusting rings 24.

Between two adjacent levers 14 along axis A22, a ball bearing is provided around shaft 22, commonly referred to as a "ball stop", through which the rollers Allows differentiated oscillating motion of the levers 14 around axis A22 along the profile of the cams 12 associated by (18).

Ball stops 26 are also disposed on either side of the levers 14 stack. Thus, in the example of the figures where four levers 14 are mounted on the shaft 22, five ball stops 26 are used. Generally speaking, the number of ball stops 26 equals the number of levers 14 plus one.

On either side of the sub-assembly formed by the parts 14 , 24 , 26 , two side rings 28 are mounted on the shaft 22 .

Two circlips 30 are disposed on either side of the side rings 28 and engage the peripheral grooves 32 of the common shaft 22, whereby the parts 14, 26 along the shaft 22 , 24 and 28) in the axial direction. The spring washer 34 is an axial spacer between one of the side rings 28 and the nearest circlip 30 and allows axial clearance adjustment of parts mounted around the common shaft 22 .

As shown in FIG. 1 , in the mounted state of the dobby, a portion of the opening 16 is left free on the levers 14 . In Fig. 1, this part of the opening 16 is shown in gray, assuming that no sealing device is used.

The opening 16 is bounded by a first edge 62 and two edges of the cover 6 parallel to axis A22, only one of which is shown in FIGS. 1 and 2 (reference numeral 64). , and these edges are parallel to each other and perpendicular to axis A22. The opening 16 is also defined by the edge 41 of the frame 4 which turns towards the cover 6 in the mounted state of the cam mechanism 2 .

In order to close the grayed out portion of the opening 16 visible in FIG. 1 , the cam mechanism 2 uses two types of sealing struts 40 (namely spacer sealing struts 40A). ) and a stack E40 of end sealing struts 40B.

3 and 5, insert A corresponds to the cross section of the spacer sealing strut 40A and insert B corresponds to the cross section of the end strut 40B.

Whether type 40A or type 40B, the sealing struts 40 are made by molding a plastic material such as polyamide. The spacer sealing struts 40A are identical to each other. Similarly, the end sealing struts 40B are identical to each other.

The number of spacer struts 40A is equal to the number of levers 14 . The number of end struts 40B is equal to 2 plus the difference between the maximum number of levers that can be mounted on the cam mechanism (here 8) and the number of levers installed on the cam mechanism. In this example, the number of strut seals is 4, and the number of end seals is 2 + (8 - 4) = 6.

A single spacer sealing strut 40A is shown in FIG. 9 in a plan view of insert A, and in two elevation views corresponding to the two opposite sides in inserts B and C.

The spacer sealing strut 40A includes a band 402, which extends along the outer side of the strut visible at insert C in FIG. between a first end 404 arranged near the edge 41 of ) and a second end 406 arranged near the cover 6 in the same mounted state, the machine 2 is strut-mounted Oriented upward in the state.

This band 402 includes two longitudinal edges 408 and 410, which edges are orthogonal to the axis A22 in the strut mounted state, and of the band 402 of the adjacent ceiling strut 40. It is configured to abut at least one longitudinal edge (410 or 408).

On the side opposite the band 402, the spacer sealing struts 40A have an arcuate inner radial edge 412 centered on an axis A40 that forms the major axis for this strut and is perpendicular to the longitudinal edges 408, 410. ) has Inner radial edge 412 extends around major axis A40 over an angular sector where the angle at apex α is strictly less than 180°, for example on the order of 140°.

The radius of curvature of radial edge 412 is indicated by R40 and is chosen to be equal to the outer radius of common ball stops 26 and rings 24, 28. Edge 412 thus defines a common shaft passage opening 22 centered on major axis A40.

In one variant, inner radial edge 412 defines a passage opening centered on major axis A40 while extending along an irregular contour distinct from the radius of curvature.

The concave volume defined in the bracket of the spacer sealing strut 40A is configured to receive, at the side of the radial edge 412 , the portion of the common shaft 22 on which the elements 24 to 28 are mounted.

With stack E40 assembled, the various major axes A40 of strut seals 40A coincide with axis A22.

The band 402 of the spacer ceiling strut has a first width 1402 near the ends 404 and 406 and is strictly less than the width 1402 in the middle region approximately corresponding to the corner angular sector at the apex α. It has a second width (ℓ'402).

On the two sides visible respectively in inserts B and C of FIG. 9 , the strut 40A is provided with stiffening ribs 414 .

At its end 404, the strut 40A has a first groove 416 extending parallel to the main axis A40 and opening on opposite sides of the strut visible in inserts B and C in FIG. to provide

This groove 416 also opens upwards from inserts A and B of FIG. 9 and has a dovetail shape, the profile perpendicular to axis A40 having a width l418 opposite the bottom 418. It has a bottom 418 larger than the width ℓ420 of the mouth 420 in . This profile is constant along the length of groove 416, between two opposite sides of strut 40A.

On the other hand, each strut 40 is pierced by a through hole 422, which is open on two opposite sides (seen in inserts B and C in FIG. 9). , constitutes a housing for receiving the support shaft 42, the longitudinal axis A42 of which is parallel to the axes A10 and A22. The longitudinal axis of hole 422 is denoted A422, which is parallel to major axis A40 of strut 40 and coincides with axis A42 of cam machine 2 in the assembled state. The through hole is a cylindrical receiving recess centered on axis A422.

The ceiling spacer strut 40A also includes a hook 424, which is formed on the side of the strut, which can be seen in insert B in FIG. 9, and in insert C in FIGS. 9 and 10. ), it is intended to engage a corresponding housing 426 formed on the opposite side of the other strut 40A or 40B. The hook 424 and the housing 426 make it possible to fasten two adjacent sealing struts 40 together in the stack E40, ie adjacent struts stacked along a common shaft 22 relative to each other. make it possible to keep

On the other hand, near the end 404, on the side view of insert B in FIG. 9, the end sealing strut 40B, as seen in insert C of FIGS. 9 and 10, It has a second hook 425 intended to engage with a corresponding housing 427 provided on the opposite side of the other strut 40A or 40B. Hook 425 and housing 427 also serve to fasten two adjacent sealing struts 40 together in stack E40, i.e. to each other, adjacent struts stacked along common shaft 22. serves to maintain

Thus, maintaining the continuity of the spacer sealing struts 40A, i.e., being stacked along the common shaft 22 relative to each other, is achieved by hooks 424 and 425 and corresponding housings 426 and 427. It can be done. In the illustrated embodiment, each end sealing strut 40B and each spacer sealing strut 40A have hooks 424 and 425 on one side of the strut and housings 426 and 427 on the opposite side of the strut. ) has

The struts are arranged adjacently along a common shaft and stacked on the common shaft 22 when continuous, forming a sealing device with a seal 52 or 54.

The spacer sealing strut 40A also includes a second groove 436, which is provided near the upper end 406 and extends parallel to the main axis A40, the inserts B and B of FIG. As can be seen in C), they are open on both sides of this strut. This groove 436 also has a bottom 438 and a mouth 440 extending along the entire length of the groove 436 between the two sides of the strut. In a section perpendicular to axis A40A, the profile of groove 436 is dovetailed, and its bottom 438 has a width 1438 greater than the width 1440 of mouth 440 .

The portion of strut end 40A near end 406 where band 402 has a maximum width 1402 is indicated at 442 and is referred to as the nose. A through hole 422 is formed in the nose 442 . From the side seen in insert B of FIG. 9 , noses 402, when stacked along a common shaft in stack E40, have ribs intended to engage under other adjacent bands of ceiling struts 402 ( Bounded by 444 , it allows to create a partial overlap between these two struts, thereby improving the sealing effect achieved at nose 442 . Similarly, the end 404 is provided with a rib 446 projecting from the side of the sealing strut visible at the insert B and intended to engage within the end 404 of an adjacent strut, whereby the ends ( 404) to improve the sealing effect obtained.

The end sealing strut 40B shown in inserts A, B and C of FIG. 10 has a structure similar to that of the strut 40A shown in FIG. 9 . In particular, this end sealing strut 40B is located near the cover 6 in the same mounted state as the first end 404, which in the mounted state of the strut is located near the edge 41 of the frame 4. defines a band 402 extending between the second ends 406 that are The longitudinal edges 408 and 410 of the band 402 are also perpendicular to the major axis A40 of this strut, and at least one longitudinal edge 410 or 408 of the band 402 of the adjacent sealing strut 40 It is configured to come into contact with

For this end sealing strut 40B, the band 402 has a width 1402 measured parallel to the major axis A40 and between the edges 108 and 410, which is equivalent to the spacer sealing strut 40A. It is constant at the same value as the maximum value.

Also, the radial inner edge 412 is circular, ie, extends 360° about the major axis A40 and has a radius R40 equal to the radius of curvature of the edge 412 of the spacer ceiling strut 40A. In one variant, inner radial edge 412 extends in an irregular contour distinct from the radius of curvature, while defining a passage opening centered on major axis A40.

A disk-shaped volume defined in the bracket of the end sealing strut 40B and bounded by an edge 412 is configured to receive a portion of the common shaft 22 . Thus, edge 412 defines a passage opening for common shaft 22 .

End sealing strut 40B also includes hooks 424 and 425 and corresponding housings 426 and 427, similar to those of spacer sealing strut 40A. This allows for continuity of the strut seals 40 regardless of their type 40A or 40B.

End sealing strut 40B also includes reinforcing ribs 414 disposed on two sides, hook 424, housing 426, and spacer sealing strut which can be seen in inserts B and C of FIG. 10 . It includes two grooves 416 and 436 having the same geometries as those of respective grooves 416 and 436 of 40A.

Accordingly, the grooves 416 and 436 of the sealing struts 40 of the stack E40, whether they are the grooves 416 and 436 belonging to the spacer sealing strut or the grooves 416 and 436 belonging to the end sealing strut, have a relationship , has the same cross-sectional profile perpendicular to the major axis A40.

End sealing strut 40B also includes ribs 444 and 446 identical to respective ribs 444 and 446 of end spacer strut 40A, as well as a through hole 422 disposed in nose 442. do. Through hole 422 is a cylindrical receiving housing centered on axis A422.

Each end strut 40B is formed of a first part 401 and a second part 403. The first portion 401 of the end strut 40B has a similar geometry to the spacer strut 40A in the front view shown in inserts B and C of FIG. 10 . In this portion 401, the width of the ribs 414 measured parallel to the main axis A40 is equal to the width ℓ402 of the band 402. Part 403 makes it possible to close the part of the edge 412 formed in part 401, about the main axis A40. In this portion 403, the ribs 414 have a width 1403 that is strictly less than the width 1402 of the band 402, measured parallel to the major axis A40.

When the end sealing struts 40B completely surround the adjusting rings 24 and the side rings 28, the end sealing struts are centered on the axis A22. Specifically, since the circumferential surfaces of rings 24 and 28 are centered on axis A22, edge 412 of end sealing struts 40B is a means for centering end sealing struts on axis A22. It includes radial protrusions that provide.

The cam mechanism 2 also includes a first elastomer seal 52 and a second elastomer seal 54 extending respectively along longitudinal axes A52 and A54, these axes being the mounts of the cam mechanism. parallel to axes A10 and A22.

The seals 52 and 54 are preferably extruded, ie produced by a particularly simple and economically advantageous extrusion process.

Seal 52 is made of an elastomeric profile having a cross-section perpendicular to axis A52 that is constant over the length L52 of seal 52. The seal 52 includes a heel 522 and a lip 524. Heel 522 is configured to stay engaged within receiving channel G2 formed by the juxtaposition of grooves 416 of different struts 40 of stack E40. Since the grooves 416 of the different struts 40 have the same profile, the cross section of the receiving channel G2 measures parallel to the coincident axes A40 and A22 when the sealing struts 40 are mounted therein. is constant over the length of the stack E40. The shape of the heel 522 is complementary to the shape of the receiving channel G2. Given the dovetail shape of the cross-sectional profile of the grooves 316 (and thus of the receiving channel G2 and heel 522), the seal 52 will ensure that the heel 522 will be in place in the receiving channel G2. When it is firmly held in place on the stack (E40).

In other words, the grooves 416 in the struts of the sealing device stacked along the common shaft 22 define a receiving channel G2 for the heel 522 of the seal 52 . Receiving channel G2 is configured to partially house seal 52 . The receiving channel G2 is also configured to position and hold the seal 52 in a major direction A52 parallel to the longitudinal axis A22.

In this position, the lip 524 abuts the edge 41 of the frame 4 , through which the first ends 404 of the sealing struts 40 and the frame 4 close to the edge 41 are connected. At the interface between the two, oil splashes are prevented from escaping from the inner volume V2.

In a similar manner, seal 54 has a constant cross-section along length L54 and is made of an elastomeric profile having a heel 542 and a lip 544. The juxtaposition of the grooves 436 of the various struts 40 in stack E40 constitutes a second channel G4 for receiving a heel 542 of constant cross-section over the length of stack E40. The shape of the heel 542 is complementary to the shape of the receiving channel G4. Given the dovetail shape of the cross-sectional profile of groove 346 (and thus of receiving channel G4 and heel 542), seal 54 will also ensure that heel 542 will be in place in receiving channel G4. When the stack (E40) is firmly held in place.

Thus, the lip 544, near the edge 62, at the interface between the second ends 406 of the sealing struts 40 and the cover 6, oil splashes from the volume V2 to the cam mechanism 2 ) to prevent going outside.

Thus, the sealing device composed of the stack E40 and the seals 52 and 54 effectively seals the outflow opening 16 around the lever arms 146 of the output levers 14 .

In practice, length L52 is equal to the length of edge 41 measured parallel to axis A22, while length L54 is greater than the length of edge 62 measured parallel to axis A22. or the same Thus, the length L52 or L54 of the seal is greater than or equal to the width 16 of the outflow opening 16, measured parallel to the longitudinal axis A22 of the common shaft 22.

The division of the cam mechanism 2, which is the distance between two identical components along a common shaft 22, measured parallel to axis X22, is indicated by d. The division d can be measured as the distance between the two faces of two adjacent levers 14, eg these faces are oriented in the same direction.

The thickness of the lever 14 is indicated by e14, which is constant in practice because each lever 14 is made by cutting a steel plate.

The width 1402 of the band 402 of the spacer ceiling strut 40A at the spacer portion is equal to the difference between the division d and the thickness e14. Thus, the intermediate regions of the spacer struts 40A bridge the gap between two adjacent levers 14 by covering the ball stop 26 disposed between these levers, thereby reducing the gap between the levers 14. Limit oil splashing through the opening (16).

Here, each of the strut seals 40A is mounted around the axial stop 26 .

On the other hand, the width ℓ402 is equal to the division d, so that in the areas of the opening 16 without the levers 14, the sealing struts 40 abut each other with their longitudinal edges 408, 410. The bands 402 of form a continuous surface that prevents splashing of oil in the volume V2 through the outflow opening 16 .

Ribs 444 and 446 reinforce the seal between two adjacent struts 40, regardless of struts 40A or 40B, while hooks 424 and corresponding housings 426, and optionally The hooks 425 and corresponding housings 427 in turn ensure precise relative positioning between the struts 40 within the stack E40.

The stacking distance of four support rings 24 each having a width e24 equal to the division d is denoted by D4. These support rings 24 provide coordination between the circlips 30 in the absence of the four levers 14 . Side rings 28 and support rings 24 have the same geometry, in particular the same axial thickness.

The length of the stack formed by the lateral ring 28 and the axial stop 26, measured parallel to axis A22, is denoted L68. The length of the stack formed by four levers 14 and four associated ball stops 26, measured parallel to axis X22, is denoted by L14.

The axial distance between the spring washer 34 in contact with the circlip 30 and the opposite circlip 30 is equal to the sum of the sizes of e24, d4, L14 and L68.

The cam mechanism 2 also includes a hoop 70 comprising a longitudinal body 72 parallel to axis A2 and a longitudinal body 72 and axis A22. is formed by two legs 74 perpendicular to and each defining a bearing (not shown) for the support shaft 42 . The hoop 70 is secured to the frame 4 by means of four screws 76, two of which are inserted into each of the legs 74.

The longitudinal body 72 is penetrated with two threads 71 for receiving two screws 61 for fixing the cover 6 to the frame 4 . For clarity of the drawing, the screws 61 are omitted in FIG. 1 , showing corresponding passage openings 63 made in the cover 6 for their passage.

The tool 80, after removing the cover 6, is connected to the common shaft 22 and between a weaving position and a leveling position, with respect to the frame 4 around axis A42. It is used to move the elements mounted on the shaft.

Leveling is carried out from the so-called weaving state in FIGS. 2 to 4 in which the rollers 18 are in contact with the cams 12 to the so-called leveling state in FIG. consists of moving The ceiling struts 40 pivot about an axis A42 and the other elements are supported by a common shaft 22 during transition between these two positions.

In the leveling state, the levers 14 are decoupled from the driving means consisting of cams 12, so that the camshaft 10 and cams 12 can be removed from the frame 4 and the weaver ) can be adjusted or changed depending on the choice of fabric and the fabric to be made.

The cam mechanism 2 of the present invention allows the common shaft 22 to be pivotally pivoted about the longitudinal axis A42 of the support shaft 42 and also allows the sealing struts 40 to have through holes 422 It is compatible with the use of a removable leveling means consisting of a tool 80 allowing it to pivot about axes A422 of the A422.

Tool 80 includes two posts 82 and a handle 84 connecting the posts, and is intended to be actuated by an operator by swinging the tool about axis A42. For clarity of drawing, tool 80 is shown partially and axially in FIGS. 3 and 5 .

Tilting the tool 80 in the direction of arrow F1 in FIG. 2 moves it from the state shown in FIG. 2 to the state shown in FIG. It is driven from the weaving state of 3 to the leveling state of FIG.

Tilting the common shaft 22 from the state of FIG. 3 to the state of FIG. 5 has the effect of driving these struts with the same movement, given the centering obtained due to the edge 412 of the end sealing struts 40B. . As the various struts 40A, 40B of stack E40 are held together by hooks 424 and 425 and housings 426 and 427, the entire stack E40 is held together by tool 80 on a common shaft. It follows the leveling movement given in (22). This movement continues until the edge of the levers 14 abuts the inner rib 44 of the frame 4 near the edge 41 , as shown in FIG. 5 .

In this position, seal 52 is away from edge 41 and its lip 524 is unstressed.

Also in this position, the seal 54 is not in contact with the cover 6 because the cover 6 was removed prior to installing the tool 80.

After modification or replacement of the camshaft 10, the levers 14 return to the weave condition by moving the common shaft from the state of Fig. 5 to the state of Fig. 3. This is done by tilting the tool about axis A42, in the opposite direction of arrow F1. Since the stack E40 is integral with the common shaft 22 for the reasons described above, this movement has the effect of automatically returning the seals 52 and 54 to their operating condition, after which the seals 52 will edge ( 41) and the seal 54 is ready to receive the inner surface 66 of the cover 6 when supported. Accordingly, the present invention is particularly suitable for cam mechanisms that must be operated from a weaving state to a leveling state or vice versa.

One of the screws 76 is surrounded by a washer 78, the outer bracket of which is fitted into a groove (not shown) on the common shaft 22 in the weave state. This connects a common shaft 22 to the plates of the frame 4 to be attached before being fastened with assembly screws 23 disposed on either side of the parts 14 to 30, 34 and 40 along axis X22. Allows for axial positioning. This ensures a precise positioning of the common shaft 22 on the frame 4 and thus a precise contact between the cam tracks 12 of the shaft 10 and the rollers 18 of the output levers 14 .

Before moving from the weaving position to the leveling position, these screws 23 are removed, allowing movement of the common shaft 22 relative to the frame 4 .

The stack E40 shown in FIG. 11 corresponds to a second embodiment of the shed forming machine of the present invention in which eight output levers 14, not shown, are mounted around a common shaft 22. The same elements as in the first embodiment have the same references. In the following, when a part of the shed forming machine is not shown in Fig. 11, the part is the same as that of the first embodiment. In this second embodiment, stack E40 comprises six spacer sealing struts 40A and two end sealing struts 40B disposed along axis A40 on both sides of spacer sealing struts 40A. include

As before, the grooves 316 and 346 of the various ceiling struts 40 define two receiving channels G2 and G4 for receiving the heels 522 and 542 of the two seals 52 and 54. together, they are the same as those shown in the previous figures and their longitudinal axes are parallel to axis A40 and thus parallel to the transverse axis of the common shaft of the shed forming machine.

In practice, the parts seen in FIG. 11 are the same as those seen in FIG. 8 , only the distribution between the two types of ceiling struts 40 is different.

According to other embodiments of the shed forming machine of the present invention, which are not shown, the number and distribution of output levers 14 may differ from those mentioned above. In this case, the stack E40 is accordingly adapted, which consists of the same spacer sealing struts 40A and end sealing struts 40B as shown in the figures.

Regardless of the number of levers 14, the stack E40 always includes two end sealing struts 40B at the ends.

In all cases, the geometry of the ceiling struts 40 brings the edges 412 of these struts closer to the axis A22 and the bands 402 have a minimum width ℓ'402. by inserting the lever arms 146 into the empty space between the two strut sealing struts 40A in the middle region having hooks and Pre-assembling them together via housings 424 and 426 makes it possible to form a sub-assembly with strut sealing struts 40A. This sub-assembly may then be coupled with threaded end struts 40B around the common shaft 22 .

The invention is shown in the figures in the case where the sealing struts 40 support two seals 52 and 54 . The invention continues to be applicable even when these struts support a single seal, which rests on a fixed part demarcating the interior volume V2 of the machine 2 . The fixing component(s) on which the seal(s) rest may be the frame 4, cover 6 or other components.

According to one variant of the present invention, not shown, the edge 412 of the end sealing strut 40B is angled with an angle at the apex less than 360 degrees, strictly greater than 180 degrees, preferably greater than 270 degrees. sector is extended. Thus, in all cases, this edge 412 constitutes a means for centering the end strut 40B around the rings 24 or 28 and thus around the axis A22.

According to variants of the invention not shown, the shape of the heels 522 and 542 of the seals 52 and 54 and the cross section of the receiving channels G2 and G4 may differ from those shown in the figures.

In one variation, seals 52 and 54, instead of being made of elastomer, may be made of a polymeric material or composite material.

The means of attachment between the ceiling struts 40 can be modified, in particular with respect to the number and shape of the hooks 424 and/or 425 and the housings 426 and/or 427 . For example, strut 40 may include only one hook 424 or 425 and only one housing 426 or 427, or even no such hook or housing.

In one variant, the ceiling struts 40 do not include a hook 424 or a housing 426, but are mounted on a common shaft by a seal 52 or 54 that restricts movement of the struts relative to each other along the common shaft ( 22) to remain stacked.

According to one variant of the present invention, not shown, the spacer sealing struts 40A can be configured to receive on their sides shown in inserts B and C of FIG. 9, and the complementary sealing member is adjacent. It is formed by a seal which rests on and seals the face of the output lever, which face is perpendicular to axis A22. This complementary seal is partly housed in the intermediate region to the intermediate sealing strut. The technical teachings of EP-A-3,162,933 apply here, the contents of which are incorporated herein by reference.

In one variation, tool 80 may be replaced with an electric motor. In practice, the cam machine 2, when changing from the leveling state to the weaving state, moves the sealing device formed by the parts 40, 52 and 54 together with the common shaft 22 about the axis A42. It can be compatible with motorized leveling drives that allow reversible tilting. In practice, it is not necessary to access the volume V2 when leveling the held frames on the loom, for example when releasing the tension of the warp sheets. In this regard, the sealing device formed by the parts 40, 52 and 54 can be pivoted about the axis A42, whereby, in the leveling state, the fixing parts 4 and 54 come into contact with them in the weaving state. 6), while the cover 6 remains in place on the frame 4.

According to another variant of the invention not shown, the invention can be implemented in a dobby instead of a cam machine. That is, the shed forming machine of the present invention may be dobby. In this case, each output lever is driven by an oscillating motion by an internal load of the machine.

The above-considered embodiments and variations may be combined with each other to create new embodiments of the present invention.

Claims (16)

As a mechanical cam or dobby type shed forming machine (2) for a loom,
the machine,
output levers 14 oscillating about a common shaft 22 centered on a longitudinal axis A22;
a cover (6) forming an outlet opening (16) through which the output levers pass;
a frame (4) which, together with the cover, partitions the internal volume (V2) of the machine; and
Sealing devices (40, 52, 54) intended for closing the outflow opening of a hood, including sealing struts stacked along the common shaft and disposed on both sides of the output levers ( 40) and a sealing device (40, 52, 54) comprising at least one seal (52, 54);
Each ceiling strut,
It extends from a first end 404 located near the frame 4 to a second end 406 located near the cover 6 and is connected to the longitudinal axis A22 of the common shaft 22. a band (402) comprising two longitudinal edges (408, 410) configured to abut at least one longitudinal edge of an orthogonal and adjacent band of a ceiling strut; and
an inner radial edge (412) defining a common shaft (22) passage opening centered on a major axis (A40) which coincides with a longitudinal axis of the common shaft at least when the machine is in a weaving state;
the seals (52, 54) extend along major directions (A52, A54) parallel to the longitudinal axis (A22) of the common shaft (22) and abut the fixed parts (4, 6) of the machine;
each ceiling strut 40 is provided with at least one groove 416, 436 extending parallel to the main axis A40 and open on each side of the ceiling strut;
The shed forming machine, characterized in that the grooves of the sealing struts of the sealing device (40, 52, 54) together form a channel (G2, G4) for receiving the heel (522, 542) of the seal. According to claim 1,
In a plane perpendicular to the main axis A40, the widths of the grooves 416 and 436 of each ceiling strut 40 (ℓ418 and ℓ438) are the widths of the mouths 420 and 440 (ℓ420 and ℓ440) A shed forming machine characterized in that it is formed by a profile having a larger bottom (418, 438). According to claim 1,
Shed forming machine, characterized in that the grooves (416, 436) of the sealing struts (40) of the sealing device (40, 52, 54) have the same profile in a plane perpendicular to the main axis (A40). According to claim 1,
The seals 52 and 54 are perpendicular to and have constant cross-sections along the principal directions A52 and A54, and the lengths of the seals L52 and L54 measured parallel to the principal directions are equal to the common shaft 22 The shed forming machine, characterized in that greater than or equal to the width (ℓ16) of the outflow opening (16) measured parallel to the longitudinal axis (A22) of ). According to claim 1,
At least one of the sealing struts (40) is a spacer sealing strut (40A), the width of the band of this strut measured parallel to the main axis between two longitudinal edges is: and a first value ℓ402 at the second ends 404, 406 and a second value ℓ in the intermediate region between the first and second ends covering the angular sector of movement of the output lever 14. '402), the first value being equal to the division (d) of the shed forming machine and the second value being parallel to the longitudinal axis A22 of the common shaft in the division of the shed forming machine. The shed forming machine, characterized in that equal to minus the thickness (e14) of the output lever measured by According to claim 5,
characterized in that the inner radial edge (412) extends around the main axis (A40) over an angular sector having an apex angle (α) strictly less than 180°. According to claim 5,
The sealing device (40, 52, 54) comprises at least one complementary sealing member mounted on the outlet opening (16) and partly housed in the spacer sealing strut (40A) in the intermediate region, the complementary The shed forming machine, characterized in that the red sealing member interacts in a sealing manner with the face of the adjacent output lever (14), which face is perpendicular to the longitudinal axis (A22) of the common shaft (22). According to claim 1,
At least one of the sealing struts is an end sealing strut (40B), the width of the band of this strut, measured parallel to the main axis between two longitudinal edges (408, 410), is: From the first end 404 to the second end 406 has a constant value ℓ402 equal to the division d of the shed forming machine 2, and the sealing strut is centered about the common shaft A22 ) means (412). According to claim 8,
At least one of the ceiling struts 40 is a spacer ceiling strut 40A, the width of the band of this strut, measured parallel to the major axis between the two longitudinal edges, having first and second ends ( 404, 406) has a first value (ℓ402) and has a second value (ℓ'402) in an intermediate region between the first end and the second end covering the angular sector of movement of the output lever (14); The first value is equal to the division d of the shed forming machine and the second value is the thickness e14 of the output lever measured parallel to the longitudinal axis A22 of the common shaft in the division of the shed forming machine. ) is the same as subtracting
The shed forming machine,
axial stops (26) disposed around the common shaft (22) on both sides of each output lever (14);
axial fasteners (30) mounted at each end of the common shaft and configured to retain the axial stops (26) and the output levers (14) on the common shaft;
At least two bearing rings (24, 28) each interposed between the axial stop (26) and the axial fastener,
end sealing struts (40B) are mounted around the support rings (24, 28) by means of the centering means (412);
Each of the spacer sealing struts 40A is mounted around an axial stop 26, each of which an output lever 14 passes outwardly, through the outflow opening 16, in the middle region of their bend. Shed forming machine, characterized in that for partitioning the volume to do. According to any one of claims 1 to 9,
Each ceiling strut 40 comprises a housing 422 passing along an axis A422 parallel to the main axis A40, which housing 422 is open on two opposite sides of the ceiling strut. A shed forming machine, characterized in that it is configured to receive a support shaft (42). According to claim 10,
a longitudinal body 72 parallel to the longitudinal axis A22 of the common shaft 22 and perpendicular to the longitudinal body 2 each forming an articulation bearing of the support shaft 42; Shed forming machine, characterized in that it comprises a hoop (70) formed by the legs (74) of the dog. According to any one of claims 1 to 9,
The shed forming machine (2) is of the dobby type, and each output lever (14) is driven by an oscillating motion by an internal rod of the machine. According to any one of claims 1 to 9,
The shed forming machine (2) is of the mechanical cam type and includes a camshaft (10) parallel to the common shaft (22), rotation of the camshaft (10) is an oscillating motion of the output levers (14). ), and each strut 40 is positioned between a weaving position in which the output levers are coupled to the camshaft and a leveling position in which the output levers are disengaged from the camshaft. Shed forming machine, characterized in that configured to pivot. According to any one of claims 1 to 9,
The shed forming machine according to claim 1, wherein the sealing struts (40) include interlocking members (424-427) configured to hold adjacent struts stacked along the common shaft (22). According to any one of claims 1 to 9,
The shed forming machine according to claim 1, wherein the sealing struts (40) comprise overlapping walls (444, 446) between two adjacent sealing struts when stacked along the common shaft (22). According to any one of claims 1 to 9,
The lower receiving channel (G2) of the sealing device (40, 52, 54) is seated in the portion (41) of the frame (4) facing the cover (6) in the weaving state of the shed forming machine (2). The upper receiving channel G4 of the sealing device 40, 52, 54, which receives the first seal 52, is in the part 66 of the cover facing the frame in the weaving state of the shed forming machine. Shed forming machine, characterized in that for accommodating the second seal (54) to be seated.

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