Outdrive lever with follower rollers of a cam-operated armor mechanism and its manufacturing process

Abstract

The roller follower exit lever of a cam-operated armor mechanism and its manufacturing method. The present invention relates to a roller follower exit lever of a cam-operated armor mechanism comprising a flat body (24), two inner flanges (30A), two outer flanges (32A), two rollers (22A), and at least two rivets (40) for attaching at least one of the outer flanges (32A) to the flat body (24). The rivets (40) pass through the body (24) and one outer flange (32A). Each rivet (40) comprises a rivet body (42), of revolution about a rivet axis (X40) and extending between a rivet head (44) and a rivet foot (46), and at least one first groove (48) formed on an external peripheral surface (S40), in which a portion of a flange (30A, 32A) forms a ridge (52). The flange (30A, 32A) comprises, on its external face, an impression (50) for the recess of the portion of the flange that forms the ridge (52).The indentation (50) is centered on the rivet axis (X40). Figure for the abbreviation: figure 4.

Description

Title of the invention: Outfeed lever with follower rollers of a cam-operated armor mechanism and its manufacturing method

[0001] The present invention relates to an output lever with follower rollers used in a cam-armor mechanism and to a method of manufacturing such a lever.

[0002] In the field of weaving looms, cam-operated warp mechanisms are known, comprising a series of oscillating levers equal in number to the number of heddle frames of the loom. Each oscillating lever is designed to be coupled to one of the heddle frames and is equipped with two rollers that cooperate with the two tracks of a complementary cam driven in rotation by a common shaft. The two tracks of the same cam are axially offset, and the rollers carried by the associated output lever must have the same axial offset as the cam tracks.

[0003] During operation, only one of the rollers of the output lever is engaged at any given time. Due to the axial offset of the engaged roller, the output lever is subjected to significant mechanical stresses, which can lead to deformations of certain elements of the lever, in particular the elements receiving the rollers.

[0004] To limit these deformations, it is known, for example from CN203807652U, to mount the rollers between a flange machined in the thickness of the lever body and an added flange, fixed to the lever body by means of a deformable rivet.

[0005] Furthermore, it is known from WO2002 / 098106A1 that the rollers can be mounted between two flanges attached to the lever body, one of the flanges being placed in a hollow recess in a lateral surface of the lever body. The attached flanges are fixed by means of deformable rivets.

[0006] Mounting the flanges onto the lever body requires a pre-drilling step in the levers and flanges to allow the insertion of the deformable rivets. This pre-drilling step and the use of deformable rivets create play that is detrimental to the assembly of the flanges onto the lever body, to the accuracy of the roller positioning, weakens the connection between the flanges and the lever body, and disrupts the lever drive kinematics.

[0007] It is these drawbacks that the invention intends to remedy in particular by proposing a new lever with follower rollers which allows a rigid and play-free assembly of the flanges on the lever body.

[0008] To this end, the invention relates to an output lever with follower rollers of a cam-armor mechanism comprising a flat body intended to support a joint with a connecting rod for transmitting the oscillating movement of the output lever to a smooth frame and comprising a first face and a second face opposite and defining between them a median plane and a bore centered on a main axis intended to receive a bearing or a bushing mounted on a shaft of the levers of the cam armor mechanism, a first inner flange one piece with the body or attached to the second face of the body, a second inner flange one piece with the body or attached to the second face of the body, a first outer flange, attached to the first face of the lever body, opposite the first inner flange, a second outer flange, attached to the second face of the lever body, opposite the second inner flange, a first roller intended to follow a first track of a cam of the armor mechanism and held in a clevis in a first space provided between the first outer flange and the first inner flange,a second roller intended to follow a second track of the cam of the armor mechanism and held in a clevis within a second space formed between the second outer flange and the second inner flange, and at least two rivets for attaching at least one of the outer flanges to the flat body, the rivets passing through the lever body and the outer flange. According to the invention, each rivet comprises a rivet body in the form of a solid of revolution around a rivet axis extending between a rivet head flush with an outer face of a first element among the outer and inner flanges, a rivet foot flush with an outer face of the second element among the outer and inner flanges, at least one first rivet groove formed on an external peripheral surface of the rivet in which a portion of the first or second element forms a ridge of a shape complementary to the first groove,The first and / or second element comprises, on its outer face, an indentation for the portion of the first or second element that forms the bead, and the indentation is centered on the rivet axis.

[0009] Thanks to the invention, rivets with a groove and the recesses in the assembled elements between the inner and outer flanges allow for precise assembly of the outer flanges to the inner flanges of the lever. Also thanks to the invention, an assembly method using grooved rivets and recessing the portion of the first or second element allows the outer and inner flanges to be joined. The recess provides sufficient material within the first or second element to form the portion engaged in the groove of a rivet. The element into which the rivet is inserted perfectly conforms to the shape of the rivet, and the interaction between the peripheral groove of the rivet and the portion of the first or second element received in this groove ensures effective anchoring of the rivet in this element.The use of grooved rivets and ridges formed by a portion of material corresponding to an indentation imprint makes it possible to obtain a roller lever. followers with good mechanical strength and which ensures optimal operation of the cam armor mechanism.

[0010] According to other advantageous aspects of the invention, the roller follower output lever comprises one or more of the following features, taken individually or in any technically possible combination: - The rivet head has a maximum diameter strictly greater than the diameter of the rivet body and in that the first groove is made around the rivet foot. - The rivet head includes a frustoconical side wall converging towards the rivet foot, and an angle at the apex of the frustoconical side wall is less than 90°, preferably less than 60°, preferably less than 40°. - A second groove is formed on the outer peripheral surface of the rivet, around the rivet body near the rivet head, the first groove is formed on the outer peripheral surface of the rivet, around the rivet foot, the first groove receives a bead of the second element, of complementary shape to the first groove, and the second groove receives a bead of the first element, of complementary shape to the second groove. - The depth of the first groove or at least one of the grooves is greater than 0.2 millimeters, preferably greater than 0.4 millimeters, preferably even greater than 0.5 millimeters. - The indentation impression is annular, it has an inner diameter equal to the diameter of the rivet body and a bottom of the impression is disposed, along the rivet axis, between the first groove of the piercing rivet and the outer face of the first and / or second element which includes the indentation impression. - A ratio between the radius of the circumscribed circle of the indentation and the radius of the piercing rivet is greater than 1.25, preferably greater than 1.5, preferably even greater than 2. - The depth of the indentation, measured along the rivet axis, is greater than 0.5 millimeters, preferably greater than 0.8 millimeters, and preferably even greater than 1 millimeter. - The external face of the first and / or second element which includes the indentation imprint extends into a semi-circular area centered on the rivet axis with a circle radius preferably greater than or equal to 1.5 times the rivet radius, preferably greater than or equal to 2 times the rivet radius and preferably even greater than or equal to 3 times the rivet radius. - A reference plane intersecting the first groove is positioned at a distance from the outer face of the first or second element, measured along the rivet axis, less than 3 millimeters, preferably less than 2 millimeters, preferably even less than 1 millimeter. - The rivet foot comprises an end face perpendicular to the rivet axis and a cylindrical joining edge between the end face and the external peripheral surface of the rivet forms a right angle. - The rivet diameter is greater than the cumulative thickness, measured along the rivet axis, of the flat body of the lever and an outer flange. - The outer flange includes a tab that extends along a lubrication axis and is configured to guide lubricant from a roller to the bore of the lever body. - The external peripheral surface of the rivet body comprises a first portion of external peripheral surface received in the first element and a second portion of external peripheral surface received in the second element, and the first portion of external peripheral surface and the second portion of external peripheral surface are concentric and of the same diameter. Each rivet is a self-piercing rivet. The use of self-piercing rivets allows the outer flanges to be joined to the inner flanges without the need for pre-drilling the components before assembly. The component into which the self-piercing rivet is inserted fits perfectly against the outer peripheral surface of the self-piercing rivet body, which limits radial play around the self-piercing rivet body, reduces degradation of the radial contact surfaces, and contributes to effective anchoring of the self-piercing rivet in this component. For the purposes of this invention, a self-piercing rivet is a rivet that is capable of piercing the components in which it is positioned without undergoing significant deformation.

[0011] The invention also relates to a method for manufacturing an exit lever as described above, comprising, according to the invention, at least the following steps: a. Drive the rivet in until the rivet foot is flush with the outer face of the second element, the rivet being pushed by an external press tooling configured to exert a pushing force on the rivet along the rivet axis (X40); and b. push back a portion of the second element to form a bead of complementary shape to the groove of the piercing rivet by means of an external die centered on the rivet axis and marking an indentation around the rivet foot on the external face of the second element and / or a portion of the first element to form a bead of complementary shape to the groove of the piercing rivet by means of a die external centered on the rivet axis and marking an indentation around the rivet head on the external face of the first element.

[0012] According to other advantageous aspects of the invention, the method for manufacturing an exit lever comprises one or more of the following features, taken individually or in all technically possible combinations: - The manufacturing process includes at least the following preliminary steps: a. cut, using a rivet which is a piercing rivet, the first element through its thickness, b. cut, using the piercing rivet, the second element in its thickness, the piercing rivet being pushed by means of the external press tooling along the rivet axis. - The manufacturing process includes an additional step consisting of positioning the second element on the first element at an overlap area in the external press tooling after step c) and before step d). - The manufacturing process includes cutting, driving and pushing steps similar to steps a) to d) for a second rivet, which is a piercing rivet positioned at a distance from the first rivet. - The manufacturing process includes an additional step consisting of machining the first or second space between the inner flange and the outer flange along a plane parallel to the median plane using a milling tool.

[0013] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0014] [Fig-1] [Fig.1] is a partial schematic representation in principle of a trade to weave comprising an exit lever according to the invention;

[0015] [Fig.2] [Fig.2] is a larger-scale view of detail II of [Fig.1], the insert A) corresponds to a front view and the inset B) to a perspective view,

[0016] [Fig.3] [Fig.3] is a partial section along line III-III in [Fig.2];

[0017] [Fig.4] [Fig.4] is a larger scale view of detail IV in [Fig.3];

[0018] [Fig.5] [Fig.5] is a view analogous to insert A) of [Fig.2], the cam and the rollers being omitted;

[0019] [Fig.6] [Fig.6] is a schematic representation in principle of the steps of a manufacturing process according to the invention;

[0020] [Fig.7] [Fig.7] is a view analogous to inset B) of [Fig.2] for a lever conforming to a second embodiment of the invention.

[0021] The loom M shown in [Fig. 1] comprises several heddle frames 2, only one of which is shown. The various heddle frames 2 of the loom M are animated by a vertical oscillating motion represented by the double arrow Fl and imparted by a cam weave mechanism 4. The output levers 6 of the cam weave mechanism 4, only one of which is shown, each drive a draw mechanism which actuates a frame and which consists of a connecting rod 8 associated with angled levers 10 connected to each other and to the heddle frame 2 by connecting rods 12.

[0022] The levers 6 are provided in a number equivalent to the number of rail frames 2 and mounted pivotally, as represented by the double arrow F2, around a lever shaft 14 supported by the frame 16 of the cam mechanism 4 and protected by a cover 18. The lever shaft 14 defines a main axis XI of the cam armor mechanism 4. Each output lever 6 is placed along the lever shaft 14 in a division whose width is fixed and equal to 12 millimeters.

[0023] The lever tree 14 has ten divisions.

[0024] The cam armor mechanism 4 comprises several complementary cams 20, only one of which is shown, and which each define two conjugate tracks 20A and 20B on which two follower rollers 22A and 22B respectively rest, supported by an output lever 6.

[0025] Each output lever 6 comprises a flat steel body 24. The flat body 24 is cut from a sheet of constant thickness. The flat body 24 supports at its end 24A a clip 26 for connecting the output lever 6 to the transmission rod 8.

[0026] The flat body 24 defines a mounting bore 24B on the lever shaft 14. As illustrated in the example in the figures, the bore 24B receives a roller bearing 28. In variants not shown, the bore 24B receives a ball bearing or a bushing.

[0027] The flat body 24 also comprises a first external face 24C and a second external face 24D. The external faces 24C and 24D are opposite and define between them a median plane PI perpendicular to the principal axis XL

[0028] The flat body 24 also includes a first inner flange 30A which is one piece with the flat body 24. A first outer flange 32A is attached to the first outer face 24C of the flat body 24 opposite the first inner flange 30A. The first outer flange 32A is a piece of steel of constant thickness, this thickness being measured along the principal axis XI when the outer flange 32A is integral with the flat body 24. The first outer flange 32A has a rounded triangular shape visible in inset A) of [Fig.2].

[0029] The first follower roller 22A is taken in clevis in a first space provided between the first outer flange 32A and the first inner flange 30A.

[0030] The flat body 24 comprises a second inner flange 30B that is one piece with the flat body 24. A second outer flange 32B is attached to the second outer face 24D of the flat body 24 opposite the second inner flange 30B. The second outer flange 32B is similar to the first outer flange 32A. The second outer flange 32B is a piece of steel, of constant thickness and of rounded triangular shape.

[0031] The second follower roller 22B is held in a clevis in a second space provided between the second outer flange 32B and the second inner flange 30B.

[0032] The first follower roller 22A and the second follower roller 22B advantageously have the same structure, or are even identical. The follower roller 22A is mainly described below, this description being applicable to roller 22B.

[0033] The follower roller 22A, all of whose elements are visible in [Fig. 3], comprises an inner ring 220 which has a disc shape centered on a roller axis X22, an outer ring 222, and rolling elements 224 interposed radially to the roller axis X22, between the inner ring 220 and the outer ring 222, such that the outer ring 222 is free to rotate relative to the inner ring 220 around the corresponding roller axis X22. When the follower roller 22A is received in the space between the first outer flange 32A and the first inner flange 30A, in an operating position, the roller axis X22 is parallel to the main axis XL

[0034] The rolling elements 224, which in the illustrated example are rollers, are held axially with respect to the roller axis X22 by two sheet metal flanks 226, located on either side of the inner ring 220 along the roller axis X22.

[0035] The outer ring 222 has a contact surface 222A which is radial to the roller axis X22 and is configured to be in contact with the track 20A of the cam 20.

[0036] Two holes are provided on the outer flange 32A, on the inner flange 30A, on the sides 226 of the roller 22A, and on the inner ring 220 of the roller 22A to receive two fastening elements 229 for attaching the roller 22A to the flat body 24. In the illustrated example, the fastening elements 229 are so-called "roller rivets." Each roller rivet 229 is centered on an axis parallel to the roller axis X22, and each roller rivet 229 is radially offset from the roller axis X22.

[0037] Preferably, two roller rivets 229 secure each follower roller 22A, 22B to the flat body 24. In other variants not shown, one roller rivet 229 secures each follower roller 22A, 22B to the lever 6 or more than two roller rivets 229 secure each follower roller 22A, 22B to the lever 6.

[0038] The follower rollers 22A, 22B have an outside diameter D22 of 88 millimeters. The outside diameter D22 is the diameter of the contact surface 222A of each roller 22A, 22B.

[0039] The first outer flange 32A and the second outer flange 32B are secured to the flat body 24 by rivets 40. In this embodiment, and according to an advantageous but not mandatory aspect of the invention, the rivets 40 are piercing rivets. In other words, the rivets 40 are capable of piercing the elements in which they are positioned without themselves deforming significantly. To this end, the piercing rivets 40 are, in the illustrated example, made of hardened steel, while the outer flanges 32A, 32B and the flat body 24 are made of steel. Any other grade of steel or steel alloys which includes for example manganese, nickel, carbon, molybdenum can be used to make a piercing rivet 40, without departing from the scope of the invention, insofar as this piercing rivet 40 is less ductile than the outer flanges 32A, 32B and the flat body 24.

[0040] Advantageously, the outer flanges 32A and 32B have identical geometries and are fixed in a similar way by piercing rivets 40 on the flat body 24.

[0041] The following mainly describes the first outer flange 32A and one of the piercing rivets 40, this description being transposable to the second outer flange 32B and to all the piercing rivets 40.

[0042] The structure and positioning of the piercing rivets 40 are shown in detail in Figures 3 and 4.

[0043] As shown in [Fig. 2], two piercing rivets 40 secure the outer flange 32A to the flat body 24. Each piercing rivet 40 defines an external peripheral surface S40, a contact surface between the piercing rivet 40 and the elements into which the piercing rivet 40 is inserted, and a rivet axis X40. When the rivet 40 is inserted into the elements 24 and 32A, the rivet axis X40 is parallel to the main axis XL

[0044] The rivet 40 comprises a rivet body 42 in the form of a solid of revolution about the rivet axis X40. In the illustrated example, the rivet body 42 is generally cylindrical. In an alternative variant not shown, the rivet body 42 is frustoconical.

[0045] The piercing rivet 40 first enters the outer flange 32A and then the flat body 24 so that the rivet body 42 extends along the rivet axis X40 between a rivet head 44 flush with an outer face S32A of the outer flange 32A and a rivet foot 46 flush with the outer face 24D of the flat body 24.

[0046] In an unshown embodiment, the piercing rivet 40 penetrates the flat body 24 first, the rivet head 44 then being flush with the outer face 24D of the lever body and the rivet foot 46 with the outer face S32A of the outer flange 32A. Generally, the first element is defined as the element between the flat body 24 and the flange 32A such that the rivet head 44 is flush with an outer face of the first element and we call second element, the element defined such that the rivet foot 46 is flush with an external face of the second element.

[0047] In an unrepresented variant, the inner flange 30A and / or the inner flange 30B are attached to the body 24 of the lever 6.

[0048] The height H40 of the piercing rivet 40, measured parallel to the rivet axis X40, is equal to the cumulative thickness of the flat body 24, of thickness e24 equal to 6 millimeters, and of the outer flange 32A, of thickness e32 equal to 5.5 millimeters, such that the piercing rivet 40 does not protrude from the output lever 6 and so that the maximum thickness e6, measured along the main axis XI, of the output lever 6 is less than the width of a division of the cam armor mechanism 4.

[0049] The maximum thickness of the output lever 6 is preferably configured to leave sufficient clearance between the multiple output levers 6 of the cam armor mechanism 4 to avoid any interference during operation, which would cause premature wear of the cam armor mechanism 4.

[0050] The rivet body 42 comprises an external peripheral surface S42. When the piercing rivet 40 is positioned within the first and second elements, the first element being, in the illustrated example, the outer flange 32A and the second element being the flat body 24, the external peripheral surface S42 of the rivet body 42 comprises a first portion S42A of the external peripheral surface received in the first element and a second portion S42B of the external peripheral surface received in the second element. The first portion S42A of the external peripheral surface and the second portion S42B of the external peripheral surface are concentric and of the same diameter.

[0051] The rivet body 42 has a diameter D42. The diameter D42 of the rivet body 42 is also by definition the diameter of the piercing rivet 40. The diameter D42 of the piercing rivet 40 is advantageously greater than the cumulative thickness e24+e32, measured along the rivet axis X40, of the flat body 24 and the outer flange 32A. In this way, the area of ​​the peripheral external surface S40 of the piercing rivet is large relative to its height, which allows optimal guidance of the piercing rivet 40 in the outer flange 32A and in the flat body 24 and good anchoring of the piercing rivet 40 in the outer flange 32A and the flat body 24. In addition, during the use of the loom M, the forces exerted on the connection between the outer flange 32A and the flat body 24 will be distributed over a large contact area, namely the surface S40.The rivet head 44 is frustoconical in shape, with a maximum diameter D44, and includes a lateral wall S44A converging towards the rivet foot 46. The maximum diameter D^ of the rivet head 44 is strictly greater than the diameter D42 of the rivet body 42. The frustoconical lateral wall S44A is defined by an angle at the apex. a. The vertex angle a is less than 90°, preferably is less than 60°, preferably still is less than 40°.

[0052] In an unrepresented variant of the invention, the angle at the apex a is greater than 90°.

[0053] The truncated conical shape of the rivet head 44 increases the contact area between the outer flange 32A and the piercing rivet 40 and allows for better mechanical holding of the piercing rivet 40 in the outer flange 32A.

[0054] The rivet head 44 also includes a centering hole 44B allowing centering of the rivet during the manufacturing process of the output lever 6.

[0055] The rivet foot 46 comprises an end face 46A perpendicular to the rivet axis X40. A cylindrical edge 46B, connecting the end face 46A to the outer peripheral surface S40 of the piercing rivet 40, forms a right angle. Thanks to this right-angled cylindrical edge 46B, the piercing rivet 40 can cleanly pierce the outer flange 32A and the flat body 24 without deformation.

[0056] By construction, the external peripheral surface S40 comprises the external peripheral surface S42 of the rivet body 42, the frustoconical side wall S44A of the rivet head 44 and the cylindrical edge 46B of the rivet foot 46.

[0057] A first groove 48 is formed on the external peripheral surface S40 of the piercing rivet 40. In the illustrated example, the first groove 48 is formed around the rivet foot 46.

[0058] The first groove 48 has a depth P48 measured perpendicular to the rivet axis X40 between the peripheral external surface S42 of the rivet body 42 and the bottom of the groove 48. The depth P48 of the groove 48 is greater than 0.2 millimeters, preferably greater than 0.4 millimeters, and preferably even greater than 0.5 millimeters.

[0059] A reference plane P2 is designated as intersecting the first groove 48 and perpendicular to the rivet axis X40. The reference plane P2 is located at a distance d, measured along the rivet axis X40, from the external face 24D of the flat body 24. The distance d is less than 3 millimeters, preferably less than 2 millimeters, and even more preferably less than 1 millimeter.

[0060] The flat body 24 comprises, on its second external face 24D, a recess 50. The recess 50 is formed such that a portion of the flat body 24, shaped to complement the groove 48, forms a bead 52 by indenting the portion of the material constituting the flat body 24 that is initially present at the location of the recess 50. The bead 52 of the flat body 24 is received in the groove 48 of the piercing rivet 40. In other words, the first groove 48 being formed around the rivet foot 46, the first groove 48 receives a portion of the second element 24 forming a bead 52 of the shape complementary to the first groove 48 and the external face of the second element includes an indentation 50 of the portion of the second element which has been displaced to form the bead 52.

[0061] The cooperation between the first groove 48 and the bead 52 allows robust retention of the piercing rivet 40 in the outer flange 32A and the flat body 24.

[0062] In variants not shown, the bead 52 does not occupy all the available volume in the first groove 48.

[0063] The recess 50 is centered on the rivet axis X40 and is annular around the rivet axis X40. The recess 50 has an inner diameter D50 measured perpendicular to the rivet axis X40. The inner diameter D50 of the recess 50 is equal to the diameter D42 of the rivet body 42.

[0064] In an unrepresented variant, the inner diameter D50 of the recess 50 is greater than the diameter D42 of the rivet body 42.

[0065] The recess 50 defines a bottom 50A. The bottom 50A of the recess 50 is located, along the rivet axis X40, between the first groove 48 and the external face 24D of the flat body 24.

[0066] The recess 50 has a depth P50 measured along the rivet axis X40 between the bottom 50A of the recess 50 and the external face 24D of the flat body 24. The depth P50 of the recess 50 is greater than 0.5 millimeters, preferably greater than 0.8 millimeters, preferably even greater than 1 millimeter.

[0067] Let C be a circle circumscribed about the indentation 50, which is visible on the insert B of [Fig. 2]. Let Rc be the radius of the circumscribed circle C. Let R42 = D42 / 2 be the radius of the piercing rivet 40. A ratio between the radius Rc of the circumscribed circle C and the radius R42 of the piercing rivet 40 is greater than 1.25, preferably greater than 1.5, and even more preferably greater than 2. This dimensional ratio allows sufficient material of the flat body 24 to be indented to form the bead 52 cooperating with the groove 48.

[0068] The recess 50 provides sufficient material for the bead 52 to cooperate with the groove 48, allowing the piercing rivet 40 to be anchored in the flat body 24, with its rivet head 44 bearing against the flange 32A. To ensure the mechanical strength of the flat body 24, which includes the recess 50, it is necessary for the flat body 24 to extend beyond the recess 50. More precisely, the flat body 24 extends, at least, over a semi-circular area with a radius greater than 1.5 times the radius of the piercing rivet 40, preferably greater than 2 times the radius of the piercing rivet 40, and preferably even greater than 3 times the radius of the piercing rivet 40, around the rivet axis X40. This Minimum dimension of the flat body 24 around the axis of rivet X40 ensures that there is sufficient material around the indentation imprint 50 so as not to weaken the exit lever 6 when the piercing rivet 40 is installed.

[0069] Each piercing rivet 40 for connecting the outer flange 32A to the flat body 24 is located from the geometric center of the corresponding roller 22A, i.e., from its roller axis X22, by a distance D measured in a plane parallel to the median plane PI and corresponding to the distance between the axes X22 and X40. Advantageously, the distance D is less than 80 millimeters, preferably less than 70 millimeters, and even more preferably less than 65 millimeters.

[0070] The quality of the connection between the outer flange 32A and the flat body 24, achieved by the piercing rivets 40, allows the outer flanges 32A, 32B to be positioned as close as possible to the roller axes X22, thus minimizing the overlap area 36, ​​which corresponds to the area where the outer flange 32A, 32B and the flat body 24 are in contact. Minimizing this overlap area 36 allows the use of smaller outer flanges 32A, 32B, thereby reducing manufacturing costs.

[0071] The manufacturing process for an output lever 6 comprising outer flanges 32A, 32B joined together by means of piercing rivets 40 as described previously is now described.

[0072] The flat body 24 of the output lever 6 and the outer flanges 32A and 32B are obtained in a known way by fine cutting of steel sheets.

[0073] The assembly of the outer flanges 32A, 32B onto the flat body 24 of the output lever 6 is carried out in several stages within an external press tooling P comprising several tools. These stages are shown in [Fig. 6].

[0074] The external press tooling P comprises two flange clamps 60A, 60B, two punches 62A, 62B and two dies 64A, 64B. In the example illustrated in [Fig.6], the first external flange 32A is secured to the flat body 24 by means of two piercing rivets 40 which are mounted in parallel and synchronously in the press tooling P.

[0075] The orientation of the representation of the side clamps 60A, 60B of the press tooling P in [Fig. 6] is not limiting. The side clamp 60A may be positioned above the side clamp 60B relative to the ground, or below the side clamp 60B relative to the ground, or the side clamps may be oriented such that the X40 axis is parallel to the ground.

[0076] The side clamps 60A, 60B are configured to maintain the flat body 24 and the outer flange 32A in contact and in a fixed position. In the illustrated example, the side clamps 60A and 60B are parallelepiped-shaped and are in contact with the outer flange 32A and the flat body 24, respectively, by means of flat surfaces. In variants not shown, the 60A, 60B side braces have different geometries such as for example a convex contact surface.

[0077] The punches 62A, 62B are configured to each guide a piercing rivet 40 during the cutting step and the driving step.

[0078] Each die 64A and 64B is configured to push a portion of the flat body 24 towards the flange 32A when the piercing rivet is in place in the elements 32A and 24, to form the ridge 52 whose shape is complementary to the groove of the corresponding piercing rivet 40. The dies 64A and 64B are aligned respectively with the punches 62A and 62B.

[0079] The first step shown in insert A) of [Fig. 6] is a positioning step. The flat body 24 and the outer flange 32A are positioned relative to each other so as to overlap to form, after manufacturing, the overlap area 36. The flat body 24 and the outer flange 32A are also positioned in the external press tooling P between the two flange clamps 60A and 60B and so that the punches 62A and 62B are opposite the desired locations of the piercing rivets 40.

[0080] The second step is a cutting step. This cutting step is shown in Inset B) of [Fig. 6]. A force F3 is applied by the press P along the rivet axis X40 to the punches 62A and 62B synchronously. The punches 62A and 62B each push a piercing rivet 40 along the rivet axis X40 so as to cut the first element, here the outer flange 32A, through its thickness and then to cut the second element, here the flat body 24, through its thickness. Advantageously, each punch 62A, 62B is engaged at the rivet head 44 of each rivet 40 in the central centering hole 44B of that rivet.

[0081] The third step is a driving step, during which each piercing rivet 40 is driven in until the rivet foot 46 is flush with the outer face 24D of the flat body 24.

[0082] The fourth step is a pushing step and is shown in Inset C) of [Fig. 6]. A force F4 is applied along the rivet axis to each die 64A, 64B so as to push back a portion of the flat body 24 to form a ridge 52 complementary in shape to the groove 48 of the corresponding piercing rivet 40. Each die 64A, 64B leaves an impression 50 around the rivet foot 46 on the outer face 24D of the flat body 24.

[0083] The method mentioned above is implemented for the securing of each of the flanges 32A and 32B with the flat body 24.

[0084] This results in an output lever 6 on which the outer flanges 32A and 32B are secured to the flat body 24 by means of piercing rivets 40. The installation of the piercing rivets 40 without pre-drilling and the fact that the assembly is simultaneous with The cutting stage ensures that there is no play between the piercing rivets 40, the outer flanges 323A and 32B and the flat body 24. The mechanical strength of the output levers 6 during use of the loom M is greatly reinforced.

[0085] Once the outer flanges 32A, 32B are assembled on the flat body 24, a clevis space 70 is machined by a milling tool at the level of the space intended to receive the rollers 22A and 22B on the flat body 24 and on the flanges 32A, 32B. The clevis space 70 is visible by tear-off in [Fig. 5] and is delimited by a machining step 71.

[0086] More specifically, an internal surface of the outer flange 32A opposite the roller 22A is machined in a plane parallel to the median plane PI so as to create a hollow recess 70A extending over the internal surface. Similarly, the external surface 24C of the flat body 24 opposite the roller 22A is machined in a plane parallel to the median plane PI so as to create a hollow recess 70B extending over the external surface 24C. The union of the hollow recesses 70A and 70B forms the clevis space 70.

[0087] Similarly, the outer flange 32B and the external surface 24D of the flat body 24 are machined to form a clevis space 70 receiving the roller 22B.

[0088] Once the clevis spaces 70 are machined opposite each roller 22A, 22B, the rollers 22A and 22B are put in place and riveted by two rivets 229 in the outer flanges 32A, 32B and in the flat body 24.

[0089] In an unrepresented embodiment of the method of the invention, in a step prior to driving the rivet, only the outer flange 32A, 32B is positioned in the outer tooling of the press P. Then, the outer flange 32A, 32B is perforated by the piercing rivets 40. The disc of material resulting from this perforation is evacuated from the press tooling P. Once this step has been carried out, the flat body 24 and the outer flange 32A, 32B are stacked and the flat body 24 is in turn perforated by the piercing rivets 40 through the hole resulting from the previous perforation of the outer flange 32A, 32B.

[0090] The assembly method described above is compatible with a stack of more than two elements. This assembly method is thus compatible, for example, with the assembly of an output lever 6 which comprises, for each follower roller, two outer flanges attached to the flat body.

[0091] The exit lever 6, as previously described, is particularly compatible with an armor mechanism described in CN215800175.

[0092] A second embodiment of an exit lever 6' is shown in [Fig. 7]. In the following description, elements analogous to those of the first embodiment bear the same reference numerals and are not described in detail. If a reference numeral is mentioned in the description but not shown in a figure, or shown in a figure but not mentioned in the description, it refers to the same element. than the one bearing the same reference in the first embodiment. In what follows, we mainly describe what distinguishes this second embodiment from the previous one.

[0093] The output lever 6' comprises outer flanges 80A with a different shape than the outer flanges 32A, 32B of the first embodiment. Only the outer flange 80A opposite the roller 22A is visible in [Fig. 7]. The piercing rivets 40 for fixing the outer flanges 80A to the flat body 24 of the lever 6 are positioned differently compared to the first embodiment.

[0094] The outer flange 80A is of rounded triangular shape and includes a tab 81 A. A notch 82A which defines an opening between the roller 22A and the flat body 24 is made in the outer flange 80A.

[0095] The lug 81A extends between the notch 82A and the central bore 24B along a lubrication axis X2.

[0096] Let Dg be the distance measured in the median plane PI between the roller axis X22 and the main axis XL. Let L81 be the length of the leg 81A along the axis X2 from the bottom of the notch 82A on the axis X2 and the end B81 of the leg 81A. A ratio between the length L81 of the leg 81A and the distance Dg between the roller axis X22 and the main axis XI is greater than 2 / 3.

[0097] The lug 81A allows the oil from the cam armor mechanism 4, projected around the roller 22A through the notch 82A, to be guided to the central bore 24B which receives the lever shaft 14. This supply of oil is beneficial to the operation of the output levers 6 and the lever shaft 14 over time.

[0098] The assembly of this output lever 6' is carried out following the same process as the assembly of the output lever 6 of the first embodiment.

[0099] For both embodiments, in a variant of the invention not shown, the first groove 48 is formed on the external peripheral surface S42 of the rivet body 42 around the rivet head 44 and receives a bead of the first element with a shape complementary to the first groove. In this configuration, the reference plane P2 is at a distance d along the rivet axis X40 from the external surface of the first element.

[0100] In an unshown embodiment of the invention, the first groove 48 is formed around the rivet foot as described above, and a second groove is formed on the outer peripheral surface S42 of the rivet body 42 near the rivet head 44. The second groove receives a ridge of the first element, the shape of which is complementary to that of the second groove. Each groove is connected to a recess 50. The recess 50 connected to the second groove is formed by the die 64A, 64B along the axis X40 of the piercing rivet 40 comprising two grooves 48. The recess connected to the first groove is formed by a movable die in the flange 60A.

[0101] In another variant not shown, the indentation impressions 50 associated with the two grooves 48 are made one by one by the die 64A, 64B along the axis X40 of the piercing rivet 40, by turning over the whole of the outer flanges 32A and 32B and the flat body 24, between the two forging steps of the two indentation impressions 50.

[0102] In unrepresented variants of the invention, other geometries and positions of grooves formed on the external peripheral surface of the piercing rivets 40 are possible.

[0103] In an unshown embodiment of the invention, each outer flange 32A, 32B is fixed to the flat body 24 by means of two piercing rivets 40 such that a first piercing rivet 40 is first inserted into the outer flange 32A, 32B and then into the flat body 24, and a second piercing rivet 40 is first inserted into the flat body 24 and then into the outer flange 32A, 32B. In this configuration, the flat body 24 and the outer flange 32A, 32B each have a recess 50.

[0104] In variants not shown, the shape of the piercing rivet 40 may be different, in particular the piercing rivet 40 may be hollow or have a head of alternative shape.

[0105] In an unshown embodiment of the invention, the lever body and flanges are pre-drilled, and the rivets are driven in and the rivet heads are formed in the rivet grooves to assemble the first and second elements, without a prior rivet cutting step. In this case, the rivets are not self-piercing rivets. Thus, the invention covers the case where the rivets have not pierced the elements in which they are positioned, these elements having been pre-drilled, either one or both. The invention also covers the case where the self-piercing rivets have partially pierced one or both elements, for example, in the case where these elements have been pre-drilled to a diameter smaller than that of the rivets.

[0106] In another, unshown embodiment of the invention, the first inner flange 30A and / or the second inner flange 30B is attached to the lever body 24. The rivet head 44 is flush with the outer face of the inner flange and the rivet foot 46 is flush with the outer face of the outer flange. The first and second elements with which the rivet head 44 and the rivet foot 46 are flush are then, on the one hand, the first or second outer flange 32A, 32B and, on the other hand, the first or second inner flange 30A, 30B, or vice versa.

[0107] In another unrepresented variant of the invention, the cleat spaces are not machined.

[0108] Insofar as this is technically feasible, the embodiments and variants mentioned above can be combined with each other.

Claims

1. Demands Exit lever (6) with follower rollers (22A, 22B) for a cam-operated armor mechanism (4), comprising: - a flat body (24) intended to support a joint (26) with a connecting rod (8) transmitting the oscillating movement of the output lever (6) to a frame of runners (2) and comprising: • a first face (24C) and a second face (24D) opposite each other and defining a median plane (PI) between them, • a bore (24B) centered on a main axis (XI) intended to receive a bearing (28) or a bushing mounted on a shaft of the levers (14) of the cam-operated armor mechanism (4), - a first inner flange (30A) one piece with the body (24) or attached to the second face (24D) of the body (24) of the lever; - a second inner flange (30B) one piece with the body s (24) or attached to the first face (24C) of the lever body (24); - a first outer flange (32A), attached to the first face (24C) of the lever body (24), opposite the first inner flange (30A); - a second outer flange (32B), attached to the second face (24D) of the lever body (24), opposite the second inner flange (30B); - a first roller (22A) intended to follow a first track (20A) of a cam (20) of the armor mechanism (4) and taken in a clevis in a first space (70) provided between the first outer flange (32A) and the first inner flange (3 OA); - a second roller (22B) intended to follow a second track (20B) of the cam (20) of the armor mechanism (4) and taken in a clevis in a second space (70) provided between the second outer flange (32B) and the second inner flange (30B); - at least two rivets (40) for fixing at least one of the outer flanges (32A, 32B) to the flat body (24), the rivets rivets (40) passing through the body of the lever (24) and the outer flange (32A, 32B), characterized in that each rivet (40) comprises: - a rivet body (42) in the form of a solid of revolution around a rivet axis (X40) extended between: • a rivet head (44) flush with an external face (24C, 24D, S32A) of a first element among the outer flange (32A, 32B) and the inner flange (30A, 30B, 24), • a rivet foot (46) flush with an external face (24C, 24D, S32A) of the second element among the outer flange (32A, 32B) and the inner flange (30A, 30B, 24); - at least one first rivet groove (48) formed on an external peripheral surface (S40) of the rivet (40) in which links a portion of the first (32A, 32B, 30A, 30B, 24) or of the second element (32A, 32B, 30A, 30B, 24) forms a ridge (52) of complementary shape to the first groove (48);in that the first element and / or the second element (32A, 32B, 30A, 30B, 24) comprises, on its external face (S32A, 24C, 24D), a recess (50) of the portion of the first or second element (32A, 32B, 24) which forms the bead (52), and in that the recess (50) is centered on the rivet axis (X40).

2. Exit lever (6) according to claim 1, characterized in that the rivet head (44) has a maximum diameter (D44) strictly greater than the diameter (D42) of the rivet body (42) and in that the first groove (48) is formed around the rivet foot (46).

3. Exit lever (6) according to claim 2, characterized in that the rivet head (44) comprises a frustoconical side wall (S44A) converging towards the rivet foot (46), and in that an angle at the apex (a) of the frustoconical side wall (S44A) is less than 90°, preferably less than 60°, preferably less than 40°.

4. Exit lever (6) according to any one of the preceding claims, characterized in that a second groove is formed on the outer peripheral surface (S40) of the rivet (40), around the rivet body (42) near the rivet head (44), in that the first groove (48) is provided on the external peripheral surface (S40) of the rivet (40), around the rivet foot (46), in that the first groove (48) receives a bead (52) of the second element (24, 32A, 32B), of complementary shape to the first groove (48), and in that the second groove receives a bead of the first element (24, 32A, 32B), of complementary shape to the second groove.

5. Exit lever (6) according to any one of the preceding claims, characterized in that the depth (P48) of the first groove or of at least one of the grooves is greater than 0.2 millimeters, preferably greater than 0.4 millimeters, preferably even greater than 0.5 millimeters.

6. Exit lever (6) according to any one of the preceding claims, characterized in that the drive impression (50) is annular, in that it has an inner diameter (D50) equal to the diameter (D42) of the rivet body (42) and in that a bottom of the impression (50A) is disposed, along the rivet axis (X40), between the first groove (48) of the piercing rivet (40) and the outer face (S32A, 24C, 24D) of the first and / or second element (32A, 32B, 24) which includes the drive impression (50).

7. Exit lever (6) according to any one of the preceding claims, characterized in that a ratio between the radius (Rc) of the circumscribed circle (C) of the indentation recess (50) and the radius (R42) of the piercing rivet is greater than 1.25, preferably greater than 1.5, preferably even greater than 2.

8. Exit lever (6) according to any one of the preceding claims, characterized in that the depth (P50) of the indentation (50), measured along the rivet axis (X40), is greater than 0.5 millimeters, preferably greater than 0.8 millimeters, preferably even greater than 1 millimeter.

9. Exit lever (6) according to any one of the preceding claims, characterized in that the external face (24C, 24D, S32A) of the first and / or second element (32A, 32B, 24) which includes the denture imprint (50) extends in a semi-circular area centered on the rivet axis (X40) with a circle radius preferably greater than or equal to 1.5 times the radius (R^) of the rivet (40), preferably greater than or equal to 2 times the radius (R42) of the rivet (40) and preferably even greater than or equal to 3 times the radius (R^) of the rivet (40).

10. Exit lever (6) according to any one of the preceding claims, characterized in that a reference plane (P2) intersecting with the first groove (48) is disposed at a distance (d) from the outer face (24C, 24D, S32A) of the first or second element (32A, 32B, 24), measured along the rivet axis (X40), less than 3 millimeters, preferably less than 2 millimeters, preferably even less than 1 millimeter.

11. Exit lever (6) according to any one of the preceding claims, characterized in that the rivet foot (46) comprises an end face (46A) perpendicular to the rivet axis (X40) and in that a cylindrical edge (46B) of junction between the end face (46A) and the external peripheral surface (S40) of the rivet (40) forms a right angle.

12. Exit lever (6) according to any one of the preceding claims, characterized in that the diameter (D42) of the rivet (40) is greater than the cumulative thickness (e24+e3 2), measured along the rivet axis (X40), of the flat body (24) of the lever (6) and of an outer flange (32A, 32B).

13. Output lever (6) according to any one of the preceding claims, characterized in that the outer flange (80A) includes a lug (81A) which extends along a lubrication axis (X2) and is configured to guide lubricant from a roller (22A, 22B) to the bore (24B) of the lever body (24).

14. Output lever (6) according to any one of the preceding claims, characterized in that the external peripheral surface (S42) of the rivet body (42) comprises a first portion of external peripheral surface (S42A) received in the first element (32A, 32B, 24) and a second portion of external peripheral surface (S42B) received in the second element (24, 32A, 32B), and in that the first portion of external peripheral surface (S42A) and the second portion of external peripheral surface (S42B) are concentric and of the same diameter.

15. Exit lever (6) according to any one of the preceding claims, characterized in that each rivet is a piercing rivet (40).

16. A method for manufacturing an exit lever (6) according to any one of the preceding claims, characterized in that the manufacturing method comprises at least the following steps: a. drive the rivet (40) until the rivet foot (46) is flush with the outer face of the second element (24C, 24D, S 32A), the rivet (40) being pushed by an external press tool (P) configured to exert a pushing force (F3) on the rivet (40) along the rivet axis (X40); and b. to push back a portion of the second element (32A, 32B, 24) to form a bead (52) of complementary shape to the groove (48) of the rivet (40) by means of an external die (64A, 64B) centered on the rivet axis (X40) and marking a denture impression (50) around the rivet foot (46) on the external face of the second element (24C, 24D, 32A) and / or a portion of the first element (32A, 32B, 24) to form a bead (52) of complementary shape to the groove (48) of the piercing rivet (40) by means of an external die (64A, 64B) centered on the rivet axis (X40) and marking a denture impression (50) around the rivet head (44) on the face external of the first element (24C, 24D, S32A).

17. A manufacturing process according to claim 16, characterized in that the manufacturing process comprises at least the following preliminary steps: a. cut, using the rivet (40) which is a piercing rivet, the first element (32A, 32B, 24) in its thickness, b. cut, using the piercing rivet (40), the second element (32A, 32B, 24) in its thickness, the piercing rivet (40) being pushed by means of the external press tooling (P) along the rivet axis (X40).

18. Manufacturing method according to claim 17, characterized in that the manufacturing method comprises an additional step consisting of positioning the second element (32A, 32B, 24) on the first element (32A, 32B, 24) at the level of an overlap zone (36) in the external press tooling (P) after step c) and before step d).

19. A manufacturing method according to any one of claims 17 and 18, characterized in that it comprises cutting, pressing and embossing steps analogous to steps a) to d) for a 22 second rivet (40), which is a piercing rivet positioned at a distance from the first rivet (40).

20. A manufacturing method according to any one of claims 16 to 19, characterized in that the manufacturing method comprises an additional step consisting of machining the first or second space (70) between the inner flange (30A, 30B) and the outer flange (32A, 32B) in a plane parallel to the median plane (PI) by means of a milling tool.

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