JP4754622B2 - Receiving rapier provided with hook-type fitting member and method for manufacturing hook-type fitting member - Google Patents

Abstract

In a hook-shaped insert (17) for a receiving gripper, the clamping surface (21) for a head of the clamping lever is provided with a profiling (26, 27). In order to advance a tool, particularly a wire (29) of an electrical discharge machining device, to the clamping surface (21), the insert is provided with a recess (28).

Description

  The invention comprises a receiving side having an arm with a clamping surface against the opposing surface of the head of the clamping lever that is movable substantially perpendicular to the clamping surface, and an arm with a guiding surface for the head of the clamping lever The present invention relates to a hook-type fitting member for a rapier, a method for manufacturing the hook-type fitting member, and a receiving-side rapier provided with the hook-type fitting member.

  A receiving rapier of the kind mentioned at the beginning is used on rapier looms. In some structural types, the receiving rapier receives the weft thread that has been inserted into the shed by the sending rapier at approximately the center of the shed, and then draws the weft thread to the side opposite the insertion side of the shed. In another structural type, the receiving rapier receives the weft yarn at the insertion side and draws the weft yarn to the opposite side.

  A receiving rapier of the kind mentioned at the outset is known, for example, from EP 0 123 005 A. For example, a hook-type fitting with a single structure made of an abrasion-resistant material has already been tightly adjusted with respect to each other during the manufacture of the hook-type fitting member. Has the advantage of being simple.

  When the weaving speed is high, a corresponding large dynamic load is applied to the receiving rapier. A relatively large clamping force is required to securely grip the weft. The clamping surface of the hook-type member of the receiving rapier has a special contour consisting of longitudinal ribs and longitudinal grooves, and it is already possible to assign a clamp lever head with a corresponding special contour to the special contour. Known (WO 02/073343). As a result, the value of the clamping force can be limited to a relatively small value, and still the weft can be securely gripped.

Producing such a special contour on the clamping surface is expensive and requires special tools. For example, a rotating grinding tool with a very small diameter must be used.
EP 0 123 005 A WO 02/073343

  The object of the present invention is to provide a fitting for a receiving rapier of the kind mentioned at the outset, which preferably can be produced at the lowest possible cost without the need for a relatively large clamping force in order to securely grip the weft. Is to develop.

  The problem is that the clamping surface of the arm of the fitting member has a special contour, and the other arm of the fitting member has a gap extending in the longitudinal direction, through which the tool can reach the clamping surface. It is solved by being.

  By forming the fitting member according to the present invention, the tool can reach the clamp surface through the gap, and the clamp surface can be processed with the tool. This tool's spatial limitations are reduced. For example, a rotary grinding tool having a relatively large diameter can reach the clamping surface and a special contour can be provided there.

  In one embodiment of the invention, the air gap forms a lateral guide for the additional portion of the head of the clamp lever by its opposite sides. As a result, the head is guided across the longitudinal direction of the receiving rapier and in this case no vibrations can occur in this lateral direction which may cause the clamp connection to break.

  In a further embodiment of the invention, the gap has a size that essentially corresponds to the width of the special contour of the clamping surface formed by longitudinal ribs and longitudinal grooves, at least in the region close to the clamping surface.

  The present invention also relates to a method for manufacturing a hook-type fitting member for a receiving rapier, wherein the fitting member includes an arm having a clamp surface with respect to a facing surface of a head of a clamp lever, and a clamp. An arm with a guide surface for the head of the lever, in this method the fitting member has a gap through which the tool reaches the clamping surface and the tool A special contour is provided on the clamping surface.

  In this method in which a gap is first provided in the fitting member, the tool is made to reach the clamp surface through the gap, so that a relatively large tool can be used to process the clamp surface.

  In the first embodiment, the special contour of the clamp surface is produced by a rotary grinding tool. Due to the clearance of the fitting member, a rotating grinding tool having a relatively large diameter can be used, yet the tool still reaches the clamping surface.

  In a particularly advantageous embodiment, the special contour of the clamping surface is produced by a wire of the electrical discharge machining device that faces in the longitudinal direction of the clamping surface.

  Further features and advantages of the invention will be apparent from the following description of the embodiments shown in the drawings and the dependent claims.

  The receiving rapier 10 shown in FIGS. 1 to 3 basically has a needle-like housing 11, and the tip of this housing is formed as a hook 12. A clamp lever 13 is guided in the housing 11 and can be moved in the longitudinal direction of the receiving rapier 10 by a drive device. The drive device comprises an actuating lever 14 projecting from the housing 11, which can be pivoted about a shaft 15. The actuating lever 14 and the clamp lever 13 are coupled so that the actuating lever pulls the clamp lever 13 into the housing 11 and pulls it away from the hook 12 when the actuating lever is pushed into the housing 11. The clamp lever 13 and therefore the actuating lever 14 are also loaded by a compression spring 16 which pushes the clamp lever 13 in the direction of the hook 12.

  The hook 12 is provided with a fitting member 17 made of a wear-resistant material, in particular steel or ceramics. The fitting member 17 has a relatively long arm 18 and a relatively short arm 19, which are connected to each other via a substantially semicircular end 20. On the inner side of the relatively long arm 18 of the fitting member 17, a clamp surface 21 is provided on which the facing surface 22 of the head 23 of the clamp lever 13 can reach.

  The facing surface 22 reaches the clamp surface 21 of the arm 18 of the fitting member 17 by changing the movement of the clamp lever 13 in the longitudinal direction to a movement substantially perpendicular to the clamp surface 21. This direction change is performed on the guide surface 24 of the arm 19 of the fitting member 17, and the opposing guide surface 25 of the head 23 of the clamp lever 13 slides along this guide surface. The guide surface 24 of the arm 19 of the fitting member 17 and the opposing guide surface 25 of the head 23 of the clamp lever 13 extend at an angle of about 30 ° with respect to the clamp surface 21 of the arm 18 and the opposing surface 22 of the head 23. ing. The clamping surface 21 of the arm 18 and the opposing surface 22 of the head 23 of the clamping lever 13 have special contours corresponding to each other, and these special contours mesh with each other. This special contour consists of longitudinal grooves 26 and longitudinal ribs 27, which will be described in more detail with reference to FIGS.

  As can be seen from FIGS. 4 and 5, the clamping surface 21 of the arm 18 of the fitting member 17 has a special contour consisting of parallel longitudinal grooves 26 and longitudinal ribs 27. The special contour of the clamp facing surface 22 of the head 23 is assigned correspondingly. In order to allow the processing tool to reach the clamping surface 21, the arm 19 on the opposite side of the arm 18 of the fitting member has a slit-like gap 28 extending in the longitudinal direction of the clamping face 21, and this gap is The arm 19 and thus the guide surface 24 are divided into two parts. Also at the end portion 20, the gap 28 extends to the height of the clamping surface 21. The gap divides the arm 19 into two partial arms 34, 35.

  The machining tool can reach the clamping surface through the gap 28, and the machining tool can form a longitudinal groove 26 and a longitudinal rib 27 therebetween. This is preferably done with wire 29 by electrical discharge machining as shown in FIG. This wire 29 is part of the electrical discharge machining device and can pass through the gap 28 to reach the clamping surface 21 to form the longitudinal groove 26 and the longitudinal rib 27 therebetween. This fabrication creates a special contour 36 at the distal end 20 corresponding to the longitudinal groove 26 and the longitudinal rib, but this special contour has no clamping function.

  The fitting member 17 is first made into its basic shape. This is done, for example, by sintering. At that time, a finely divided powdery substance made of cemented carbide is preferably formed into a basic body, that is, heated to the vicinity of the melting point of the substance to be baked and hardened and cured. In one variant embodiment, the fitting member 17 is processed from a metal block into a basic shape, in particular by grinding. In a further variant embodiment, the fitting member is cast into its basic shape. The basic shape of the fitting member 17 basically has a U-shaped gap 41, which is between both arms 18 and 19 and extends perpendicularly to the weft entry direction. The U-shaped gap 41 is produced together with the basic shape of the fitting member 17. The guide surface 24 for the clamp lever head is suitably formed by grinding.

  The gap 28 can already be provided in the basic shape of the fitting member 17 and then preferably finished by grinding. In another embodiment, the gap 28 is machined into the basic shape of the fitting member 17 with a wire 29 by electric discharge machining. When a special contour composed of the longitudinal grooves 26 and the longitudinal ribs 27 is formed by electric discharge machining with the same wire 29, all the machining steps are performed in one work process involving clamping of the fitting member 17. Benefits arise. In one variant embodiment, a relatively thick wire is provided in the basic shape of the fitting member 17 followed by a special contour with longitudinal grooves 26 and longitudinal ribs 27 with relatively thin wires 29. Make it.

  As can be seen from FIG. 5, the gap 28 has a size corresponding to the width of the clamping surface 21 of the arm 18 only in the region of the clamping surface 21, ie only at the end 20. In other areas, the gap is narrowed to less than half. Such a gap 28 is sufficient for the wire 29 of the electric discharge machine to reach the clamp surface 21. When the special contours of the clamping surface 21, i.e. the longitudinal grooves 26 and the longitudinal ribs 27, are produced with a rotary grinding tool, the gap 28 also matches the width of the clamping surface 21 in the region of the arm 19, i.e. at both ends. It must have a size corresponding to the spacing of the longitudinal grooves 26.

  As can be seen in particular in FIGS. 2 and 6, in this exemplary embodiment, the head 23 of the clamp lever 13 is provided with an additional part 30, which is an air gap 28 in the arm 19 of the fitting member 17. Guided between both sides. This protects the head 23 from movement across the longitudinal direction of the clamp lever 13 even if the special contours of the clamping surface 21 of the arm 18 and the opposing surface 22 of the head 23 are not yet engaged with each other. A side surface of the gap 28 forms a guide surface 42 for the additional portion 30 of the head 23.

  In the exemplary embodiment according to FIG. 6, the gap 28 is also used to align and secure the fitting member 17 with respect to the hook 12. The hook 12 includes a protruding portion 32, and this protruding portion is fitted into the space 28 between the partial arms 34 and 35 of the arm 19 when the fitting member 17 is attached to the hook 12. The fitting member 17 is also supported by the lower portion 31 of the hook 12.

  In the embodiment according to FIGS. 7 and 8, the clamping lever 43 does not move longitudinally, but only performs a rotational movement around the rotation axis 48, as is known, for example, from WO 02/073343. . In this embodiment as well, a fitting member comprising two arms 18 and 19 corresponding to the exemplary embodiment described above is provided. Also in this structural type, the arm 19 is divided into two partial arms 34 and 35 by the gap 28. The head 44 of the clamp lever 43 is provided with an additional portion 45, and this additional portion is guided between the side surfaces of the gap 28, like the additional portion 30 shown in FIG. As shown in FIG. 8, the clamp lever 43 can move in the direction of the double-headed arrow A without the additional portion 45 being disengaged from the guide formed by the gap 28 of the arm 19. The edge 46 is movable to the arm 19.

  The invention is not limited only to the exemplary embodiments shown. In particular, when the special contour of the clamping surface 21 of the arm 18 of the fitting member is produced with the wire 29 by an electric discharge machine instead of a rotary grinding tool, the gap 28 has a shape different from that of this exemplary embodiment. Can do.

FIG. 2 is a partial view of a receiving rapier according to the present invention for a rapier loom. It is an enlarged view of the receiving side rapier in the area | region of the hook type fitting member in the closed state. FIG. 3 is a diagram corresponding to FIG. 2 in an opened state. It is a perspective view of the fitting member at the time of producing a special outline with an electric discharge machining apparatus. It is the perspective view which expanded the fitting member seen in the direction of the special outline of a clamp surface for a while. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2. FIG. 2 is a partial view similar to FIG. 1 of a modified embodiment in an open state. FIG. 8 shows a variant of the embodiment based on FIG. 7 in a clamped state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Receiving rapier 11 Housing 12 Hook 13 Clamp lever 14 Actuation lever 15 Shaft 16 Compression spring 17 Insertion member 18 Arm 19 Arm 20 End part 21 Clamp surface 22 Opposing surface 23 Head 24 Guide surface 25 Opposing guide surface 26 Longitudinal groove , Special contour 27 longitudinal rib, special contour 28 gap 29 wire, tool 30 additional part 31 lower part 32 projecting part 34 arm 35 arm 41 gap 43 clamp lever 44 head 45 additional part 46 edge 48 rotating shaft

Claims (12)

  An arm (18) having a clamping surface (21) with respect to the opposing surface (22) of the head (23, 44) of the clamping lever (13, 43) movable substantially perpendicular to the clamping surface, and an opposite arm (19) A hook-type fitting member (17) for a receiving rapier (10) for a rapier loom, wherein the clamping surface (21) of the arm (18) of the fitting member (17) is special. A contour (26, 27) and the opposite arm (19) of the fitting (17) has a gap (28) through which the tool (29) is clamped A fitting member characterized in that it can reach the surface (21).   The gap (28) forms a lateral guide for the additional part (30, 45) of the head (23, 44) of the clamp lever (13, 43). The fitting member according to 1.   In the region where the gap (28) is at least close to the clamp surface (21), the width of the special contour formed by the longitudinal rib (27) and the longitudinal groove (26) of the clamp surface (21). The fitting member according to claim 1, wherein the fitting member basically has a corresponding size.   The gap (28) has a width narrower than the width of the clamping surface (21) provided with the special contour of the arm (18) in the area of the arm (19) on the opposite side. The fitting member as described in any one of Claim 3.   A receiving rapier for a rapier loom having an arm (18) with a clamping surface (21) against the opposing surface (22) of the head (23, 44) of the clamping lever (13, 43) and an opposite arm. In the method for manufacturing a hook-type fitting member (17) for (10), the fitting member (17) has a gap (28), and the tool (29) passes through the gap to the clamping surface. (21) is reached and special contours (26, 27) are machined into the clamping surface (21) by the tool.   6. Method according to claim 5, characterized in that the clamping surface (21) has a special profile consisting of longitudinal ribs (27) and longitudinal grooves (26).   Method according to claim 6, characterized in that the special contour of the clamping surface (21) is produced with a rotary grinding tool.   The method according to claim 6, characterized in that the special contour of the clamping surface (21) is produced with a wire (29) of the electrical discharge machining device directed in the longitudinal direction of the clamping surface.   9. A method according to any one of claims 5 to 8, characterized in that the gap (28) is provided by electrical discharge machining.   A hook-type fitting member having an arm (18) having a clamp surface (21) with respect to a facing surface (22) of the head (23, 44) of the clamp lever (13, 43), and an opposite arm (19) A receiving rapier for a rapier loom comprising (17), wherein the hook-type fitting member (17) is formed corresponding to at least one of claims 1 to 4. Side rapier.   The basic body of the receiving rapier (10) comprises at least one protrusion (32) that bites into the gap (28) of the fitting member (17). Recipient rapier.   The head (23, 44) of the clamp lever (13, 43) is provided with an additional portion (30, 45) guided in the gap (28) of the fitting member (17). 12. A receiving rapier according to claim 10 or 11, characterized in that:

Images