Pulley block used for being installed in pulley mechanism of jacquard machine

Abstract

The invention discloses a pulley block used for being installed in a pulley mechanism of a jacquard machine. Compact pulley block (1) for installation in a pulley mechanism of a jacquard machine and a corresponding method for manufacturing such a pulley block (1), the pulley block (1) comprising a shaft (3), a pulley (5) rotatably arranged about the shaft (3), and a housing (4) made at least partially of plastic, the housing (4) being fixed to the shaft (3), the housing (4) being at least partially contiguous with a side of the pulley (5), and the housing (4) comprises a metal fixing plate (10, 10 ', 10' ', 11, 11') which is fixed to the shaft (3) by an interference fit in order to fix the housing (4) to the shaft (3).

Description

Technical Field

[0001] The present invention relates to a pulley set for being installed in a pulley mechanism of a jacquard machine, comprising:

[0002] - a shaft;

[0003] - a pulley, which is arranged to be rotatable about the shaft; and

[0004] - a housing, which is at least partly made of plastic, is fixed to the shaft and at least partly abuts against the side surface of the pulley.

[0005] The present invention further relates to a pulley mechanism for a jacquard machine, which pulley mechanism comprises the pulley set according to the present invention.

[0006] Furthermore, the present invention relates to a jacquard machine, which comprises the pulley mechanism according to the present invention.

[0007] Furthermore, the present invention relates to a method for producing a pulley set for being installed in a pulley mechanism of a jacquard machine. Background Art

[0008] As described, for example, in WO 2014 / 076558 A2, a jacquard machine is used to bring the warp threads in a loom into the correct position in each weaving cycle so as to combine with the weft threads to achieve a desired weaving structure with a desired pattern.

[0009] The warp threads are brought into the required position by means of a pulley mechanism. In this type of pulley mechanism, a first type of pulley set is provided with an upper pulley and a lower pulley. Examples of such a pulley set are known, for example, from CH 380046A, CN 203 229 633U, EP0 526 820 A1, CH 367 452A and EP 3 247 828B1, CN 217 579 225U. A second type of pulley set in such a pulley mechanism only comprises one pulley, which constitutes a reversing roller. In addition, the pulley mechanism may also comprise a pulley set having more than 2 (for example 3) pulleys. The examples given in the present patent application specifically relate to a pulley set having two pulleys, but can be applied, with the necessary modifications, to a single-wheel pulley set or a pulley set having more than 2 wheels.

[0010] The pulley mechanism as described in WO 2014 / 076558 A2 is used, for example, in a jacquard machine for moving the warp yarns of a single-piece flat loom. In this case, an upper pulley rope is passed around an upper pulley. The rope is provided with two corresponding hooks (a set of complementary hooks) which can selectively move in tandem with two corresponding cutters, for example in anti-phase, wherein the movement of the corresponding hooks is converted into a rotation of the upper pulley via the upper pulley rope. By influencing the hooks with the aid of one or more associated selectors (e.g., electromagnetic selectors), the hooks are fixed in their highest or lowest position (depending on the design) for the duration of one or more weaving cycles. A lower pulley rope is passed around a lower pulley, which is connected at one end to one or more heddles, which are provided with an opening (heddle eye) through which the warp yarns pass for adjusting the position of the warp yarns. Such heddles are spring-loaded, and the other end of the lower pulley rope remains in a well-defined position in the jacquard machine.

[0011] Similar pulley mechanisms are used in multi-rapier looms that are arranged to be able to insert more than one weft yarn per weaving cycle at different weft insertion levels. The associated pulley mechanism can then comprise a plurality of pulley blocks with 2 or more wheels and / or additional counter wheels.

[0012] Given the growing trend toward weaving higher-density fabrics and / or offering more colors in fabrics, Jacquard machines are facing increasing demands regarding the number of pulley mechanisms that can be accommodated within the same volume. Therefore, any solution for making Jacquard machines more compact is of particular importance. To achieve this, the pulleys are preferably designed to be as light and inexpensive as possible, while also being able to withstand the greatest possible load per unit volume.

[0013] With this purpose in mind, various pulley blocks have been developed.

[0014] In a first known compact pulley block described in WO 2017 / 206,276 A1 U, the pulley block is mainly made of metal to ensure sufficient strength and compactness.

[0015] In another known compact pulley block, the pulley is formed by molding a plastic sheave around a central, upright flange of a metal shaft. This upright flange, arranged in the center of the metal shaft, thus forms the core of the pulley. The two side bodies forming the housing for the pulley block are provided with recesses into which the ends of the shafts are rotatably mounted, so that the shaft with the pulley centrally fastened thereto is rotatably arranged relative to these side bodies. However, for this purpose, the side bodies must be designed to be sufficiently rigid.

[0016] In a second, more compact known pulley block, a metal shaft is clamped in a recess of a side body, around which plastic pulleys are rotatably mounted. By clamping, the side body is also axially fixed in this way by the shaft. At the ends of these shafts, the side bodies cannot be displaced outwards or inwards in the pulley block because the clamping with the shafts prevents this. Due to this axial fixation, these side bodies themselves can be designed to be less rigid and thus more compact and / or lighter and / or cheaper, or for the same compactness, the pulley block can have a longer working life.

[0017] In EP 3 247 828 B1, a compact pulley block is described which has side bodies axially fixed in at least one cavity of a shaft. Such a pulley block is not so easy to manufacture in practice. SUMMARY OF THE INVENTION

[0018] The object of the present invention is to solve at least some of the above-mentioned drawbacks and to provide an improved compact pulley block with a good working life.

[0019] This object of the present invention is achieved by providing a pulley block for mounting in a pulley mechanism of a jacquard machine, the pulley block comprising:

[0020] - a shaft;

[0021] - pulleys, which are arranged to be rotatable around the shaft; and

[0022] - a housing made partly of plastic, which is fixed to the shaft and at least partly abuts against the sides of the pulleys, and which housing comprises a metal fixing plate which is fixed to the shaft by an interference fit in order to fix the housing to the shaft.

[0023] By making the housing partly of plastic and applying such a metal fixing plate therein to fix the housing to the shaft by an interference fit, the overall width of the pulley block can be reduced without significantly reducing the width of the wheel bearings, which has a reliable shaft holding force.

[0024] Relative to the solution proposed in EP 3 247 828 B1, the creep of the metal material of the fixing plate is negligible. Thus, there is hardly any loss of holding force due to time, temperature and / or environment.

[0025] The metal fixing plate also provides a metal thrust surface for guiding the wheel bearings.

[0026] Such a pulley block can be produced at a lower cost while maintaining the reliability of the pulley block.

[0027] The fixing plate preferably comprises a hollow elongated cylindrical part provided for an interference fit.

[0028] In order to make the housing at least partly of plastic, the housing preferably comprises a plastic part to which the fixing plate is fixed at at least one edge.

[0029] In a preferred embodiment, the fixing plate is snapped into a slot in the plastic part at at least one edge so as to fix the fixing plate to the plastic part. The fixing plate preferably fits along several sides in the plastic part, even more preferably along several opposite sides, and still more preferably, the fixing plate is fixed in the plastic part over its entire circumference.

[0030] More specifically, the fixing plate can be fixed to the plastic part by overmolding. This allows for a cheaper choice of material for the plastic part.

[0031] By making the housing partly of plastic, it can easily be made lightweight and have a relatively complex shape to combine the various functions of such a housing. The plastic part can more specifically have a guiding function in a pulley, for example for guiding a rope and / or guiding a pulley in a track in a jacquard machine and / or guiding a sheave. The plastic part is then a guiding part of a pulley block.

[0032] For heat dissipation, the fixing plate preferably extends partly over the outer periphery of the pulley block. Since the fixing plate constitutes a metallic path for heat to dissipate to the outer surface of the pulley block, the pulley block has improved bearing thermal performance. As a result, the pulley block has a longer bearing life, avoids melting of the plastic of the housing, and possible lubricant degradation is slower.

[0033] To simplify the manufacture of the pulley block according to the invention, the shaft is preferably a solid shaft. The fixing plate is preferably provided with a central cavity, which can be provided in the form of a hole for example, into which the shaft can be press-fitted for an interference fit. The central cavity can have a circular shape or a polygonal shape, such as an octagon.

[0034] Alternatively, for example, a hollow shaft can be provided and the metallic fixing plate can be fixed to the hollow shaft similarly from the outside or can be fixed to the hollow shaft by an internal press fit for example.

[0035] When viewed in the longitudinal direction of the shaft, the pulley is supported on the shaft in the bearing area of the shaft. The interference fit is preferably located in the interference area of the shaft, outside this bearing area of the shaft.

[0036] When viewed in the longitudinal direction of the shaft, the shaft has a length P with 4 mm < P < 20 mm, and the bearing area preferably has a length W with 2.4 mm < W < 12 mm.

[0037] In addition, the diameter D of the shaft is preferably 0.8 mm < D < 7 mm, and even more preferably 1.5 mm < D < 4 mm. When observed in the longitudinal direction of the shaft, the fixing plate preferably extends within the fixing area at the end of the shaft, and the fixing area preferably has a length Y of 0.5 mm < Y < 3.5 mm. The fixing area is preferably also completely located outside the supporting area. The interference area is preferably completely located within the fixing area.

[0038] In a specific embodiment, the fixing plate is the first fixing plate of the housing, which is fixed to the first end of the shaft, and the housing includes a second fixing plate, which is fixed to the second end of the shaft opposite to the first end via an interference fit so as to fix the housing to the shaft.

[0039] Then, the first fixing plate is preferably a part of the first side body of the housing, which is in contact with the pulley side on the first side, and the second fixing plate is preferably a part of the second side body of the housing, which is in contact with the pulley side on the second side opposite to the first side. Then, the first side body and the second side body are interconnected by the shaft.

[0040] In such an embodiment, the pulley is the first pulley of a pulley set, and the pulley set includes one or more additional pulleys. Each additional pulley is arranged to be rotatable about a corresponding shaft of the pulley set, and each additional pulley is laterally connected to the side body. The side body is preferably interconnected only by the shaft and one or more additional interconnecting members extending between the pulleys. In this way, a pulley set with greatly reduced size can be obtained.

[0041] The object of the present invention is also achieved by providing a pulley mechanism for a jacquard machine, which includes the above-mentioned pulley set according to the present invention.

[0042] In addition, the object of the present invention is achieved by providing a jacquard machine including such a pulley mechanism.

[0043] In addition, the object of the present invention is achieved by providing a method for producing a pulley set for installation in a pulley mechanism of a jacquard machine, including:

[0044] - Providing a shaft;

[0045] - Providing a pulley;

[0046] - Arranging the pulley to be rotatable about the shaft;

[0047] - Providing a housing, at least part of which is made of plastic and includes a metal fixing plate;

[0048] - Fixing the housing to the shaft by fixing the metal fixing plate to the shaft via an interference fit, and at least partially laterally connecting to the pulley.

[0049] In this way, a pulley block according to the present invention having the above-described advantages is obtained.

[0050] This interference fit or press fit or friction fit is preferably obtained mainly by the deformation (plastic and / or elastic) of the fixing plate. The deformation of the fixing plate preferably includes an important part of elastic deformation and contributes greatly to maintaining friction. The shaft preferably remains undeformed mainly by the interference fit. This makes it easier to ensure that the cylindrical outer surface of such a shaft remains precisely cylindrical for bearing performance.

[0051] The fixing plate can be made of, for example, a metal sheet, which is preferably made by stamping.

[0052] More specifically, a central cavity can be stamped therein, and the shaft can be pressed into this cavity to achieve an interference fit.

[0053] In a preferred embodiment, the fixing plate is deformed before the interference fit. Preferably, a hollow elongated cylindrical part is formed thereby, providing for achieving an interference fit. More specifically, the fixing plate can be provided with the central cavity, and this cavity can be provided with a curved part having a raised edge, thereby forming a hollow elongated cylindrical part. Thereafter, the shaft can be pressed into this hollow elongated cylindrical part to achieve an interference fit. Instead of providing the central cavity by stamping, the fixing plate can alternatively be deformed, for example, to form a blind hole, and the shaft can be pressed into this blind hole in order to achieve an interference fit.

[0054] In order to deform the fixing plate, it can be deformed, for example, by metal forming and / or by deep drawing, etc.

[0055] In order to provide a housing, the housing is preferably formed by overmolding a plastic part onto the fixing plate.

[0056] In a housing having a plurality of side bodies, each side body can be formed by overmolding a corresponding plastic part onto at least one corresponding fixing plate. In addition to the one or more interconnections with one or more shafts and the corresponding fixing plates, the plastic parts of such side bodies can be provided with connecting elements in order to interconnect these side bodies by additional interconnections.

[0057] The present invention will now be explained in more detail based on the following detailed description of a preferred embodiment of a rapier bar according to the present invention. The purpose of this specification is only to give explanatory examples and to point out other advantages and features of the present invention, and therefore should not be construed as a limitation of the application field of the present invention or of the patent rights claimed in the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In this detailed description, reference is made to the drawings by reference numerals, wherein:

[0059] Figure 1Schematically shows a pulley mechanism having a pulley set;

[0060] Figure 2 Shows a specific embodiment of a pulley set according to the present invention in a front view;

[0061] Figure 3 Shows in a perspective view Figure 2 of the pulley set;

[0062] Figure 4 Shows in a cross-section according to Figure 2 line AA' in Figure 2 of the pulley set;

[0063] Figure 5 Shows in a cross-section according to Figure 2 line B - B' in Figure 2 of the pulley set;

[0064] Figure 6 Shows Figure 2 an exploded perspective view of the pulley set;

[0065] Figure 7 Shows separately in a perspective view Figure 2 the fixing plate of the pulley set;

[0066] Figure 8 Shows separately in a perspective view Figure 2 an alternative embodiment of the fixing plate of the pulley set;

[0067] Figure 9 [[ID=4S]]Shows in a front view an alternative embodiment of a pulley set according to the present invention;

[0068] Figure 10 Shows in a cross-section according to Figure 9 line EE' in Figure 9 of the pulley set;

[0069] Figure 11 Shows in a cross-section according to Figure 9 line FF' in Figure 9 of the pulley set;

[0070] Figure 12 Is Figure 9 an exploded perspective view of the pulley set;

[0071] Figure 13 Shows separately in a side view Figure 9 the fixing plate of the pulley set;

[0072] Figure 14 Shows separately in a longitudinal section Figure 9 the fixing plate of the pulley set. Detailed Description

[0073] The jacquard machine according to the invention comprises at least two rows of hooks (34) and at least two knives, each knife moving up and down in antiphase with respect to a row of hooks (34) and driving or not driving the corresponding hook (34).

[0074] In Figure 1 two hooks (34) are shown, each hook (34) forming part of a corresponding row of hooks (34). These two hooks (34) form a so-called hook group.

[0075] As Figure 1 shown, these two hooks (34) are connected to an upper pulley rope (2) which has been passed around the upper pulley (5) of a pulley block (1). A lower pulley rope (2') is passed around the lower pulley (5) of this pulley block (1). A first end of this lower pulley rope (2') is connected to one or more heddles (33) which are provided with openings (eyes) through which the warp threads (32) pass for adjusting the position of the warp threads (32). Such a heddle (33) is fitted with a spring (35). At the second end, the lower pulley rope (2') is held at a position (36) which is clearly defined in the jacquard machine. This position (36) can be a fixed position or can be adjustable, for example by means of a control profile. By means of the control profile, the height of the eyes of the jacquard heddles (33) can be adjusted without having to adjust the height of the entire jacquard machine.

[0076] By the displacement of the hooks (34), via the upper pulley rope (2), the position of the pulley block (1) is also changed and thus, via the lower pulley rope (2'), the position of the heddle (33) is also changed. In this way, the warp threads (32) assembled here enter the desired position in order to achieve, together with the weft thread (31), the desired weave structure with the desired pattern.

[0077] In addition to Figure 1 the components depicted in

[0078] the shown pulley block (1) of the pulley mechanism can further comprise other components, such as reversing rollers around which the pulley ropes (2, 2') have been passed and which can also constitute pulleys, draw cords etc. according to the invention.

[0079] The shaft (3) preferably has a higher wear resistance than the pulley (5).

[0080] For this purpose, the shaft (3) can preferably be made of metal, and preferably of bearing steel, such as carbon chromium steel, preferably hardened, more specifically, for example, hardened to 60 HRC, and preferably having a fine surface finish. This can advantageously also be a material used for, for example, hydraulic applications, precision instruments, control devices, etc., so that its availability is high, and thus high-quality products can be achieved at a limited cost. In the illustrated embodiment, the shaft (3) is a solid shaft (3), and preferably a needle roller is used as such a solid shaft, that is, a component designed for a roller bearing, which is standardly available. In an alternative, not shown embodiment, a hollow shaft can also be used.

[0081] More specifically, stainless steel types from the AISI 300 series, for example, AISI type 302, 304, 310, 316, etc., preferably in the state represented by "fully hard", are suitable materials for such a shaft (3). Preferably, such a shaft (3) is manufactured by a drawing process.

[0082] In order to be able to better retain the lubricant, the shaft (3) of the pulley set (1) according to the invention is preferably provided with a porous coating. Such a coating can be, for example, tungsten disulfide.

[0083] The pulley (5) is preferably made of plastic. In this regard, they can be described in detail in a known manner. Here, polyoxymethylene (POM) or nylon (PA6 or PA6.6) can be considered, but for a more durable solution, polyetheretherketone (PEEK) can also be considered. Preferably, lubricating additives, such as graphite or teflon (polytetrafluoroethylene - PTFE), are added to this plastic.

[0084] In order to be able to better retain the lubricant, such a pulley (5) can also be provided with a labyrinth seal.

[0085] As Figure 3 、 Figures 5 to 6 and Figures 11 to 12 shown, such a pulley (5) is preferably provided with slots (27) on its periphery in order to guide the pulley rope (2) that has passed around here.

[0086] The housing (4) of the pulley block (1) according to the invention is partially made of plastic and includes one or more fixing plates (10, 10', 10", 11, 11') for fixing the housing (4) to one or more shafts (3). These fixing plates (10, 10', 10", 11, 11') are fixed to the corresponding shafts (3) by an interference fit. The interference fit is mainly obtained through the deformation (plastic and / or elastic) of the fixing plates (10, 10', 10", 11, 11'). The deformation of the fixing plates (10, 10', 10", 11, 11') preferably includes a significant component of elastic deformation, which highly contributes to maintaining friction. In the illustrated embodiment, the interference fit is achieved through approximately 45% elastic deformation and approximately 55% plastic deformation. The shaft (3) preferably remains undeformed mainly due to the interference fit. This makes it easier to ensure that the cylindrical outer surface of the shaft (3) remains precisely cylindrical to improve bearing performance. By means of frictional clamping, not only is the housing (4) axially fixed by the shaft (3), but the shaft (3) is also radially fixed by the housing (4), such that the shaft (3) cannot rotate relative to the housing (4), which avoids wear.

[0087] The illustrated pulley block (1) includes side bodies (6, 6', 7, 7'), which are arranged on both sides of the pulley (5) and form the housing (4). In an alternative embodiment, only one side body may constitute the housing (4), which is in contact with one or more pulleys (5) on at least one of its sides.

[0088] Each of the illustrated side bodies (6, 6', 7, 7') includes a corresponding plastic part (8, 8', 9, 9'), which includes at least one of the fixing plates (10, 10', 10", 11, 11'). In an alternative, not shown embodiment, a single plastic part may include two such side bodies.

[0089] The metal fixing plates (10, 10', 10", 11, 11') can be made of austenitic stainless steel, which is low-cost, readily available, has a high elongation at break and does not require additional corrosion protection. In this regard, for example, the AISI 300 series, such as INOX 301 - 304, can be used, preferably in the state indicated by "semi-hard".

[0090] The metal fixing plates (10, 10', 10", 11, 11') can be made of metal sheets. If the metal fixing plates are made of metal sheets, the metal sheets preferably have a thickness of approximately 0.3 mm.

[0091] When the fixing plates (10, 10', 10'', 11, 11') are made of metal sheet, they are preferably formed by stamping. The central cavity (16) can be stamped as a through-hole therein as in the illustrated embodiment, or alternatively, a blind cavity can be formed therein, and the shaft (3) can be pressed into the cavity (16) to achieve an interference fit. Such a central cavity (16) can have a circular shape, as in the illustrated embodiment, or a polygonal shape, such as an octagon.

[0092] In the illustrated embodiment, the fixing plates (10, 10', 10'', 11, 11') are deformed before the interference fit such that by bending the metal sheet, the raised edge (16) is set into the cavity (16), thereby forming a hollow elongated cylindrical portion (23) for achieving the interference fit.

[0093] Viewed in the longitudinal direction (L) of the shaft (3), the pulley (5) is supported on the shaft (3) in the support region (W) of the shaft (3). In the illustrated embodiment, the interference fit is located in the interference region (X) of the shaft (3), outside this support region (W) of the shaft (3). In an alternative embodiment, for example with a hollow shaft (3), the interference region (X) can at least partially overlap with the support region (W).

[0094] When viewed in the longitudinal direction (L) of the shaft (3), the shaft (3) preferably has a length P of 4 mm < P < 20 mm, and the support region (W) preferably has a length W of 2.4 mm < W < 12 mm.

[0095] Furthermore, the diameter D of the shaft (3) is preferably 0.8 mm < D < 7 mm, even more preferably 1.5 mm < D < 4 mm. Viewed in the longitudinal direction of the shaft (3), the fixing plates (10, 10', 10'', 11, 11') preferably extend within the fixing region (Y) at the end of the shaft (3), and this fixing region (Y) preferably has a length Y of 0.5 mm < Y < 3.5 mm. This fixing region (Y) is preferably also completely outside the support region. The interference region (X) is preferably completely inside the fixing region (Y).

[0096] In Figures 2 - 6 the first illustrated embodiment, these dimensions are more specifically P = 5.8 mm, W = 3.5 mm, D = 2.0 mm, Y = 1 mm and 0.5 mm ≤ X ≤ 0.7 mm.

[0097] When the fixing plates (10, 10', 10'', 11, 11') are deformed, before achieving the interference fit, as in the illustrated embodiment, the length of the interference region (X) is preferably 0.3 mm ≤ X < 3 mm. In an alternative embodiment where the fixing plates do not deform after stamping, the interference region (X) has a length resulting from the deformation of the fixing plates when achieving the interference fit.

[0098] In an alternative, not shown embodiment having only one side body, the length P of the shaft (3) is 4 mm < P < 20 mm, and the length W of the bearing area (W) is preferably 2.4 mm < W < 12 mm. The interference area (X) can then have a longer length X of up to 10 mm.

[0099] In an alternative, not shown embodiment of a pulley with a hollow shaft, a metal fixing plate with protrusions can be provided for fixing the metal fixing plate to the hollow shaft by internal press fitting. In such an embodiment, up to the full length of the shaft can be used to fix the fixing plate to the shaft, such that the fixing area (Y) can reach 20 mm. Preferably, the length Y of this fixing area (Y) is still limited to a maximum of 10 mm.

[0100] In Figures 2 - 8 In the first embodiment shown, a separate fixing plate (10, 10”, 11) is provided at each end of each shaft (3). All fixing plates (10, 10”, 11) are identical, but can deviate from each other in alternative embodiments. In Figures 9 - 14 In the second embodiment shown, a first fixing plate (10’) is provided on one side of two shafts (3), and a second fixing plate (11’) is provided on the other side of the two shafts (3). These fixing plates (10’, 11’) are identical, but can deviate from each other in alternative embodiments.

[0101] Preferably, each plastic part (8, 8’, 9, 9’) is overmolded onto one or more corresponding fixing plates (10, 10’, 10”, 11, 11’). This allows for the selection of cheaper materials. Polyamide 6.6, with or without the combination of glass fibers (e.g., 30% glass fibers), is for example a suitable material for one or more plastic parts (8, 8’, 9, 9’) of such a housing (4), but other materials, such as polyamide 6 and polyoxymethylene (POM), are also eligible as base plastics.

[0102] In order to rigidly fix the metal fixing plates (10, 10’, 10”, 11, 11’) in the plastic parts (8, 8’, 9, 9’) during overmolding, the metal fixing plates (10, 10’, 10”, 11, 11’) are provided with irregularities (19, 20, 22) in their outer circumference (17). In the embodiment as Figure 7 shown, the fixing plate (10) mainly has a circular shape, but is provided with a flat edge (19), thereby preventing the fixing plate (10) from moving in the overmolded plastic part (8). In the embodiment as Figure 8 shown, a notch (20) is provided in the outer circumference (17). In the embodiment as Figure 13In the illustrated embodiment, the fixing plate (10') is further provided with a notch (22) and additionally with an irregularly shaped hole (21) to prevent the fixing plate (10') from moving in the overmolded plastic part (8').

[0103] In the first illustrated embodiment, as Figures 2 to 8 shown, by overmolding, the metal fixing plates (10, 10", 11) are captured in the corresponding plastic parts (8, 9) at their entire outer periphery (17). In the second embodiment shown, as Figures 9 to 14 shown, the metal fixing plates (10', 11') are edge - locked in slots in the plastic parts (8', 9') at two opposite sides during overmolding.

[0104] In the illustrated embodiment, after overmolding the plastic part, the fixing plates (10, 10', 10", 11, 11') each extend partially at the outer periphery of the pulley set (1) for heat dissipation.

[0105] In the illustrated embodiment, the side bodies (6, 6', 7, 7') are interconnected by shafts (3), which is achieved by the corresponding fixing plates (10, 10', 10", 11, 11') of the side bodies (6, 6', 7, 7'). In an embodiment having only one pulley (5), such side bodies (6, 6', 7, 7') can only be interconnected with the corresponding shaft (3). One or more additional interconnections can be provided, which then preferably extend only on one side of the pulley (5). In an embodiment having multiple pulleys (5), in addition to being interconnected with the shaft (3), one or more additional interconnections can be provided. In the illustrated embodiment, such an additional interconnection (12) is located between the pulleys (5). Thus, the housing (4) extends only laterally next to and between the pulleys (5) but does not extend beyond the pulleys, thereby obtaining a particularly compact pulley set (1). In the illustrated embodiment, the plastic parts (8, 8', 9, 9') are provided with corresponding pins (13) and holes (14) for achieving the additional interconnection (12). After inserting the pin (13) into the hole (14), the pin (13) is deformed, for example by ultrasonic welding, to form a thickened head (15), thereby achieving such an additional interconnection (12). In an alternative embodiment, the additional interconnection can be obtained, for example, by using a press - fit and / or snap - fit connection and / or an adhesive, etc.

[0106] As Figures 2 - 3 、 Figure 6 、 Figure 9 and Figure 12 shown, the housing (4) can be provided with wings (29) that extend between multiple pulleys (5), or in the case of a single wheel, approximately 50% of the wheel circumference is covered by the wings to better guide the rope (2) around the pulley (5).

[0107] At least one side body (6, 6', 7, 7') of the pulley block (1) according to the present invention preferably includes a groove (28), as shown in a specific embodiment of Figure 3 for fixing the pulley ropes (2, 2') that bypass the pulley (5). The groove (28) preferably extends transversely to the longitudinal direction (L) of the corresponding axis (3) over the entire side body (6, 6', 7, 7'), and preferably starts from one side of the side body (6, 6', 7, 7') and extends to its opposite side. The groove preferably presents the same curved shape as the curved shape of the pulley ropes (2, 2') that bypass the pulley (5).

Claims

1. A pulley set (1) for installation in a pulley mechanism of a jacquard machine, comprising: - a shaft (3); - a pulley (5) arranged to be rotatable about the shaft (3); and - a housing (4) fixed to the shaft (3) and at least partially in lateral contact with the pulley (5); Characterized in that the housing (4) is partially made of plastic and includes metal fixing plates (10, 10', 10", 11, 11'), and the metal fixing plates are fixed to the shaft (3) by an interference fit so as to fix the housing (4) to the shaft (3).

2. The pulley block (1) according to claim 1, characterized in that, The housing (4) includes separate metal fixing plates (10, 10', 10", 11, 11') at each end of the shaft (3).

3. The pulley block (1) according to any one of claims 1-2, characterized in that, The fixing plates (10, 10', 10", 11, 11') include hollow elongated cylindrical portions (23) provided for interference fit.

4. The pulley block (1) according to any one of claims 1-2, characterized in that, The housing (4) includes plastic components (8, 8', 9, 9'), and the fixing plates (10, 10', 10", 11, 11') are fixed to the plastic components by at least one edge.

5. The pulley block (1) according to claim 4, characterized in that, The fixing plates (10, 10', 10", 11, 11') are snapped into slots in the plastic components (8, 8', 9, 9') by the at least one edge so as to fix the fixing plates (10, 10', 10", 11, 11') to the plastic components (8, 8', 9, 9').

6. The pulley block (1) according to claim 5, characterized in that, The fixing plates (10, 10", 11) are snapped into the plastic components (8, 9) over their entire circumference (17) so as to fix the fixing plates (10, 10", 11) to the plastic components (8, 9).

7. The pulley block (1) according to claim 4, characterized in that, The plastic components (8, 8', 9, 9') are guiding components of the pulley set (1).

8. The pulley block (1) according to any one of claims 1-2, characterized in that, The fixing plates (10, 10', 10", 11, 11') partially extend in the outer peripheral part of the pulley set (1) for heat dissipation.

9. The pulley block (1) according to any one of claims 1-2, characterized in that, Viewed in the longitudinal direction (L) of the shaft (3), the pulley (5) is supported on the shaft (3) in a support region (W) of the shaft, and the interference fit is located in an interference region (X) of the shaft (3) outside the support region (W) of the shaft (3).

10. The pulley block (1) according to any one of claims 1-2, characterized in that, The fixing plates (10, 10', 10") are the first fixing plates (10, 10', 10") of the housing (4), the first fixing plates (10, 10', 10") are fixed to the first end of the shaft (3), and the housing (4) includes second fixing plates (11, 11') fixed to the second end of the shaft (3) opposite to the first end by an interference fit so as to fix the housing (4) to the shaft (3).

11. The pulley block (1) according to claim 10, characterized in that, The first fixing plate (10, 10', 10") is part of the first side body (6) of the housing (4), the first side body (6) being in contact with the side of the pulley (5) on the first side, the second fixing plate (11, 11') being part of the second side body (7) of the housing (4), the second side body (7) being in contact with the side of the pulley (5) on the second side opposite the first side, and the first side body (6) and the second side body (7) being interconnected by the shaft (3).

12. The pulley block (1) according to claim 11, characterized in that, The pulley (5) is the first pulley of the pulley set (1), the pulley set including one or more additional pulleys (5), each additional pulley (5) being arranged to be rotatable about a respective shaft (3) of the pulley set (1), and each additional pulley being side-connected to the side bodies (6, 7), and the side bodies (6, 7) being interconnected only by the shaft (3) and one or more additional interconnecting members (12) extending between the pulleys (5).

13. The pulley mechanism for a jacquard machine is characterized in that, The pulley mechanism includes the pulley set (1) according to claim 1.

14. Jacquard machine, characterized in that, The jacquard machine includes the pulley mechanism according to claim 13.

15. A method of manufacturing a pulley set (1) for installation in a pulley mechanism of a jacquard machine, comprising: - providing a shaft (3); - providing pulleys (5); - arranging the pulleys (5) to be rotatable about the shaft (3); - providing a housing (4) at least partially made of plastic, - fixing the housing (4) to the shaft (3) and at least partially in contact with the sides of the pulleys (5); characterized in that the housing (4) includes metal fixing plates (10, 10', 10", 11, 11'), the metal fixing plates (10, 10', 10", 11, 11') being fixed to the shaft (3) by an interference fit so as to fix the housing (4) to the shaft (3).

16. The method according to claim 15, wherein The interference fit is mainly obtained by deformation of the fixing plates (10, 10', 10", 11, 11').

17. The method according to any one of claims 15-16, characterized in that, The fixing plates (10, 10', 10", 11, 11') are deformed before the interference fit.

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