Device for fastening a gripper to a gripper shaft of a textile machine

Abstract

Device for fastening a gripper (101) on a gripper shaft of a textile machine, with a carrier element (3; 103) for the gripper (101), wherein the carrier element (3; 103) for the gripper (101) is connected to a holder (2; 102) via a connecting element or is connectable to the gripper shaft via the connecting element in such a way that the carrier element (3; 103) for the gripper (101) is detachable from the holder (2; 102) or the gripper shaft, characterized in that the connecting element is designed as a toggle screw (11) or as a latch (152), wherein the toggle screw (11) engages a bore (10) in the carrier element (3) rotatably passing through into a corresponding opening (24) in the holder (2) or the gripper shaft, engaging behind an abutment, or wherein the latch (152) is designed as a positive connection between the carrier element (103) and the holder (102).

Description

The invention relates to a device for fastening a gripper on a gripper shaft of a textile machine, having a carrier element for the gripper, wherein the carrier element for the gripper is connected to a holder via a connecting element in such a way or can be connected to the gripper shaft via the connecting element in such a way that the carrier element for the gripper is detachable from the holder or the gripper shaft.DE 34 00 206 C2 discloses a method for operating a sewing machine, in particular a multi-needle sewing machine, which has one or more needles or one or more grippers as stitch forming tools. In this method, the sewing material is conveyed in any desired directions within a plane of the sewing material. It is provided that at least one of the stitch forming tools having holders is displaced transversely to the plane of movement of the gripper as a function of the nail bending caused by the conveyed material to be sewn in such a way that the distance between the needle in the region of the lowermost operating position and the plane of movement of the gripper remains substantially the same. From this prior art, the arrangement of a plurality of grippers with gripper holders on a gripper shaft is known.A device of the generic type is known from DE 195 18 063 A1. This publication discloses a multi-needle sewing machine with at least one needle bar and fastening devices for the individual needles as well as with at least one gripper shaft, to which gripper holders with grippers are fastened. Multi-needle sewing machines for sewing large-area sewing material, such as quilts, are equipped with a large number of needles per needle bar. If a plurality of needle beams, in particular two or three needle beams common to the needle row, are provided, the number of needles increases accordingly. The individual needles include grippers which together with the needles form the essential parts of the sewing members. The grippers are fastened via gripper holders to common reciprocating gripper shafts.In such multi-needle sewing machines, a considerable problem arises in that the pattern to be sewn on the large-area sewing material must often be changed over. For this purpose, all or at least a large part of the needles must be disassembled and remounted at another point of the relevant needle bar. In order to avoid a slanting course or even crossing over of the upper threads, these usually have to be cut through beforehand. Since the needles have hitherto usually been fastened to the needle bar by means of complicated screw connections, tools, usually special tools, are required for dismantling and for remounting the needles at other locations, because the fastening devices are difficult to access. The same also applies analogously to the grippers or the gripper holders with their lower threads. For the above reasons, the changeover of a multi-needle sewing machine to a different sewing pattern involves considerable labour and time. DE 195 18 063 A1 proposes for this purpose quick-locking devices both for the needles or needle holders and / or the gripper holders of each gripper. This technology has proven itself and is still used today. For the grippers, this prior art specifically proposes a quick-locking device which has a locking bracket which is pivotably articulated about a pivot bolt of the gripper holder and engages around a part of the gripper shaft. In this embodiment from the prior art, it is disadvantageous that a high clamping force is required between the locking bracket and the gripper shaft for a fixed seat of a gripper holder on the gripper shaft. This results in surface wear of the gripper shaft, which must be compensated for by repair.Alternatively, a plug-in locking device manually actuatable between the gripper and the gripper holder is provided, for example in the manner of a bayonet lock.The modification of a multi-needle sewing machine is, however, also associated with the fact that the grippers also require a certain setting in relation to the needles, since the grippers are intended to engage in thread loops formed by the needles below the material to be sewn during the sewing operation. This must be done with corresponding accuracy, so that the setting of the gripper to the needle must also be done as accurately as possible. This has been done up to now by releasing the gripper holders on the gripper shaft and pushing them towards the needle or moving them away from it before the gripper holders are again fixed on the gripper shaft. This process is very complicated and also subject to error loads, so that damage to the sewing elements can be detected again and again. Moreover, the setting of the gripper holders on the gripper shaft by the very small space in this region is a very delicate work. Since the alignment of grippers, also referred to below as grippers, with respect to the needle is not necessarily discernible without aids, small mirrors are used for this purpose, with which the setting is controlled. This takes place during the setting process, so that the person executing this process holds the mirror with one hand and carries out the setting process with the second hand.Proceeding from this prior art, the object of the invention is to further develop a device of the generic type in such a way that the fastening of the grippers to the gripper shaft can be carried out as simply and thus quickly as possible, with sufficiently secure hold being ensured.This object is achieved by the connecting element being designed as a toggle screw or as a locking mechanism, wherein the toggle screw engages, rotatably passing through a bore in the carrier element, in a corresponding opening in the holder or the gripper shaft, engaging behind an abutment, or wherein the locking mechanism is designed as a positive-locking connection between the carrier element and the holder.In contrast to the prior art, in the device according to the invention according to a first embodiment a toggle screw is provided in combination with an abutment. The toggle screw passes through a bore in the carrier element and is mounted in the latter in a freely rotatable manner. The abutment is arranged in the holder or in the gripper shaft and can be provided, for example, as a projection in a bore, behind which the toggle screw engages by rotation and thus fixes the carrier element on the holder or the gripper shaft. The embodiment with a holder moreover has the advantage that the holder can be variably arranged and fixed in the axial direction of the gripper shaft. Thus, the gripper shaft can remain free of bore for receiving fastening elements. The abutment can also be configured bayonet-like and cooperate with a projection on the toggle screw, wherein it is advantageous if the configuration of toggle screw and abutment also serves for clamping the carrier element on the holder or the gripper shaft. In addition, spring elements can be provided which hold the connection between the carrier element and the holder or gripper shaft and tension in order to prevent unintentional loosening during operation of the textile machine.In the second embodiment of the device according to the invention, a latching between the carrier element and the holder or gripper shaft is provided. This latching can be, for example, a type of clip closure, with which the carrier element is fixed to the holder or the gripper shaft. This is a form-fit connection, which is important for a firm seat of the carrier element on the holder or the gripper shaft and which will be described below.In both embodiments according to the invention, the carrier element with the gripper can be easily detached from the holder or the gripper shaft. In the first embodiment, the carrier element is connected to the holder via the toggle screw. The toggle screw is designed in such a way that a high-strength connection can be produced with a small rotation. For this purpose, the toggle screw engages in the holder or the gripper shaft and is rotatable, for example, by 45°, so that, for example, a projection at the free end of the toggle screw engages behind a projection in the bore in the holder or the gripper shaft and clamps there. The projection in the bore can be designed as an inclined surface which interacts with the projection on the toggle screw, so that the projection on the toggle screw is guided along the projection in the bore and the toggle screw is thereby drawn into the bore in the longitudinal axis direction.Insofar as the invention is described below with reference to a fastening of the carrier element to the holder, this is of course also intended to cover an embodiment in which the fastening of the carrier element is provided directly on the gripper shaft.Preferably, the toggle screw has at its free end, i.e. protruding from the carrier element, a radially extending shoulder which serves for simplified rotation of the toggle screw. However, it is also possible for the toggle screw to have a tool surface on the end face, which can be actuated, for example, with a screwdriver, but also with a wrench.An alternative embodiment of the connecting element is the latching of the carrier element to the holder. As a result, a positive connection is provided between the carrier element and the holder. In this embodiment, the carrier element is pushed onto the holder until the two components latch together. In order to release the carrier element, the latching is canceled and the carrier element can be removed from the holder.In order to ensure simple mounting of the holder on the gripper shaft, it is provided that the holder is formed in two parts, wherein the two parts are connected to one another, for example, via screws oriented at right angles to one another. The holder further has an opening corresponding to the gripper shaft. As a rule, this opening is circular. The opening has an inner diameter slightly smaller than the diameter of the gripper shaft, so that the holder can be braced on the gripper shaft via the screws.In the first embodiment of the embodiment of the carrier element, this is L-shaped and has two legs. One leg has a receptacle for the gripper and a second leg has an adjusting device. As a rule, the gripper has a cylindrical shoulder which can be inserted into a corresponding opening in the leg and fixed by means of a set screw. The alignment of this fixing screw is generally parallel to the alignment of the course of the adjusting device. By means of the adjusting device in the second limb, this second limb is adjusted relative to the holder, as a result of which the first limb carries out a movement parallel to the longitudinal axis direction of the gripper shaft. Preferably, the carrier element is arranged with at least one partial region spaced apart from the holder. This is preferably the region of the leg which carries the gripper and is arranged opposite the holder. The distance between the leg of the carrier element and the holder enables a friction-free adjustment in this region.In order to simplify the assembly or disassembly and the adjustment of the carrier element relative to the holder, it is provided according to a further feature of the invention that the bore for the eccentric and the opening for the toggle screw are arranged running parallel in the holder. Both the eccentric and the toggle screw are therefore provided, for example, on the more easily accessible front side of the holder, so that they are easily accessible both during the assembly / disassembly of the carrier element and during the adjustment of the carrier element relative to the holder. It can also be seen here that both toggle screw and eccentric are visible and can thus be actuated without auxiliary means.The eccentric has a first section which is rotatably mounted centrally in the bore of the holder. The eccentric has a second section which is arranged eccentrically offset with respect to the first section and engages in a bore in the carrier element. Accordingly, the eccentric is inserted with its first section into a correspondingly formed bore in the holder. This bore is formed with an internal thread which interacts with the external thread of the eccentric.The first section of the eccentric terminates with the surface of the holder, so that this section does not engage in the opening of the carrier element, which opening is designed as an elongated hole, for example. The second section of the eccentric engages in this opening, namely in such a way that this second section rests with a partial section of its outer circumferential surface against the inner wall of the opening. By rotating the eccentric, the abutting subsection of the second section is adjusted along the inner lateral surface of the opening, whereby the second section of the eccentric exerts an adjusting force on the carrier element, so that the latter is adjusted relative to the holder.Preferably, the eccentric has a slot on the end face for receiving an adjusting tool, for example a screwdriver. This embodiment enables simple adjustment with a tool of simple design. Alternatively, the eccentric can have key surfaces on its outer surface for cooperation with a ring or jaw key.Furthermore, it is provided that the toggle screw has a T-shaped hammer head at its end facing the holder, which head engages behind a projection in the opening, and that the toggle screw is braced with respect to the holder by means of a spring, preferably a disk spring. In this preferred embodiment, the toggle screw can be inserted with the hammer head into the bore of the holder and subsequently rotated through a certain angle, whereby the hammer head engages behind the projection and the toggle screw is pulled into the bore in the axial direction. At the same time, the spring is thereby tensioned in such a way that the toggle screw is securely arranged in the bore and the opening of the carrier element by the spring tension and holds the latter in the position. Subsequently, the fine adjustment of the carrier element and thus of the gripper relative to the holder and thus relative to the needle can now be carried out via the adjusting device, for example the eccentric. A complicated adjustment of the previously correctly mounted holder on the gripper shaft is no longer necessary. A very precise and sensitive adjustment of the gripper tip relative to the needle is possible.According to a further feature of the invention, it is provided that the toggle screw is secured to the carrier element by a ring against falling out. The toggle screw extends through the opening in the carrier element and is rotatably mounted in this opening. By widening the diameter of the toggle screw, the toggle screw is prevented from being pushed through the opening. After the toggle screw has been inserted into the opening, a ring is placed on the opposite side, which ring engages into an annular groove of the toggle screw and projects beyond the outer diameter of the toggle screw in this region and thus prevents the toggle screw from being pushed back out of the opening of the carrier element. The toggle screw is thus captively fastened to the carrier element, so that the carrier element and toggle screw together with the gripper form a component which can be mounted integrally on the holder or can be removed from the holder. This is effected without problems by loosening the toggle screw, so that the latter can be pulled out of the bore of the holder.In the second embodiment of the device according to the invention, it is provided that the carrier element is substantially L-shaped and has two limbs running at right angles to one another and a first latching element provided on one limb, which interacts with a second second latching element provided on the holder. This is the embodiment of the invention in which the connecting elements configured as latching elements form a latching between the carrier element and the holder. The two limbs running at right angles to one another are arranged in such a way that these two limbs bear against two surfaces of the holder running at right angles to one another. The carrier element can thus be pushed onto the holder, which is already mounted on the gripper shaft, and locked with the latter, so that a positive and fixed connection between carrier element and holder is possible.The carrier element preferably has first connecting elements which are arranged in second correspondingly configured connecting elements of the holder, so that the carrier element is connected to the holder in a positive-locking manner. This can be, for example, a combination of a cylindrical pin on the carrier element and a corresponding bore on the holder. The carrier element is inserted into the bore with this pin and is thus fixed in its orientation. The carrier element can now be pivoted about this pin via the actuating element in order to move its gripper tip in the direction of the needle or away from the latter.For simplified assembly and disassembly of the carrier element on the holder, it has proven advantageous to design the carrier element to be flexurally elastic, so that in particular parts of the two legs of the carrier element can be pushed onto the holder under a certain prestress and, in addition to the positive connection, a frictional connection is also provided, which connects the carrier element to the holder. In order to easily release the carrier element from the holder, a finger attachment is provided on the carrier element according to the invention. By means of this finger attachment, the latching elements on the legs can be moved in such a way that the latching between the carrier element and the holder is canceled. At the same time, the frictional connection between the carrier element and the device is released, so that the carrier element can subsequently be removed from the holder. The finger attachment is preferably designed as an extension of a leg, so that an actuation can take place, for example, by gripping the carrier element with index finger and thumb and subsequently applying force to the finger attachment via the thumb.Further features and advantages of the invention will become apparent from the following description of the accompanying drawings, in which preferred embodiments of the device according to the invention are shown. In the drawing, the following are shown: FIG. 1 shows a first embodiment of a device according to the invention in a perspective view; FIG. 2 shows the device according to FIG. 1 in a side view, illustrated in section, along the section line II-II in FIG. 3 ; FIG. 3 shows the device according to FIGS. 1 and 2 in a view; FIG. 4 shows the device according to FIGS. 1 to 3 in a further perspective view; FIG. 5 shows a holder as part of the device according to FIGS. 1 to 4 in a perspective view; FIG. 6 shows the holder according to FIG. 5 in a side view, illustrated in section, along the section line VI-VI in FIG. 8 ; FIG. 7 shows the holder according to FIGS. 5 and 6 in a plan view; FIG. 8 shows the holder according to FIGS. 6 to 7 in a side view; FIG. 9 shows a carrier element as part of the device according to FIGS. 1 to 4 in a perspective view; FIG. 10 shows the carrier element according to FIG. 9 in a side view, illustrated in section, along the section line X-X according to FIG. 12 ; FIG. 11 shows the carrier element according to FIGS. 9 and 10 in a plan view; FIG. 12 shows the carrier element according to FIGS. 9 to 11 in a front view; FIG. 13 shows a toggle screw in a perspective view; FIG. 14 shows the toggle screw according to FIG. 13 in a side view; FIG. 15 shows the toggle screw according to FIGS. 13 and 14 in a front view; FIG. 16 shows the toggle screw according to FIG. 14 in a side view adjusted by 90°; FIG. 17 shows an adjusting device in a perspective view; FIG. 18 shows the adjusting device according to FIG. 17 in a first side view; FIG. 19 shows the adjusting device according to FIG. 18 in a second view rotated through 90°; FIG. 20 shows the adjusting device according to FIGS. 17 to 19 in a front view; FIG. 21 shows a second embodiment of a device according to the invention in side view; FIG. 22 shows the device according to FIG. 21 in plan view; FIG. 23 shows the device according to FIGS. 21 and 22 in a bottom view; FIG. 24 shows the device according to FIGS. 21 to 23 in a first front view; FIG. 25 shows the device according to FIGS. 21 to 24 in a second front view; FIG. 26 shows a carrier element of the device according to FIGS. 21 to 25 in a perspective view; FIG. 27 shows a holder for the device according to FIGS. 21 to 25 in a perspective view; FIG. 28 shows the device according to FIGS. 21 to 25 in a perspective view, and FIG. 29 shows a detailed view of the connection between the carrier element according to FIG. 26 and the holder according to FIG. 27.FIG. 1 shows a device for fastening a gripper (FIGS. 21 to 25 and 28 ) in a perspective view. The device consists of a holder 2 and a carrier element 3 detachably fastened thereto. The carrier element 3 is L-shaped and has a first leg 4 and a second leg 5, which are oriented at right angles to one another.The second leg 5 has a bore 6 in the region of a free end, which serves to receive a cylindrical section of the gripper. The bore 6 is oriented at right angles to the longitudinal extent of the limb 5. The first leg 4 has a bore 7 which extends through the first leg 4 in the direction of the longitudinal axis of the second leg 5 and ends in the region of the bore 6. In the region of this end of the bore 7, an internal thread 8 is formed, which interacts with an external thread of a grub screw 9. The grub screw 9 serves to fix the cylindrical section of the gripper in the bore 6, so that the latter is held in the carrier element 3. The gripper is thereby secured against falling out and twisting relative to the carrier element.The first leg 4 of the carrier element 3 has a further bore 10, which serves to receive a toggle screw 11, which is described in detail below with reference to FIGS. 13 to 16.Finally, the first leg 4 has, in the region of a stepped section 12, a further bore 13 which is designed as an elongated hole and is aligned coaxially with a bore 14 in the holder 2. An adjusting device 15 is inserted into the bores 13 and 14, which will be described below with reference to FIGS. 17 to 20.The holder 2 consists of two parts which are connected to one another to form an opening 16 for receiving a gripper shaft, not shown in detail.A first part 17 of the holder 2 is substantially L-shaped and has a first leg 18 which has a bore at its free end for receiving a screw 19 with which the leg 18 is screwed to a second part 20 of the holder 2. For this purpose, a threaded bore 21 with an internal thread is provided in the second part 20, which bore is aligned identically with the bore 6 in the carrier element 3.A second screw 22 passes through a further bore in the second leg 5 of the first part 17 of the carrier element 3, wherein the screw 22 is oriented in its course at right angles to the course of the screw 19 and engages with its free end in a bore 23 with an internal thread in the first part 17 of the carrier element 3.The first leg 18 also has a threaded bore 23 parallel to the bore 14 which serves to receive the free end of the toggle screw 11. A projection 25 in the form of two cylindrical pins is inserted into the bore 24 as an abutment for the toggle screw 11.The bore 10 in the leg 4 of the carrier element 3 is visible to have a region of larger cross section, in which a securing ring 26 connected to the toggle screw 11 engages in such a way that the toggle screw 11 is secured against falling out of the bore 10. The toggle screw 11 is furthermore formed with a radially protruding hand attachment 27 which facilitates a rotation of the toggle screw 11.As can be seen, the carrier element 3 rests with the leg 4 against an end face of the holder 2, namely the first part 17. The second leg 5 of the carrier element 3, in contrast, is arranged spaced apart from an end face of the first part 17 of the holder 2 forming a gap 28, so that no friction is to be overcome in this region during a relative movement of the carrier element 3 with respect to the holder 2 via the adjusting device 15. The corresponding oppositely arranged surfaces of the leg 5 of the carrier element 3 and of the first part 17 of the holder 2 can otherwise be designed congruently. For example, circular arc-segment-shaped surfaces, i.e. a concave surface, for example in the region of the first part 17 of the holder 2 and a convex surface in the leg 5 of the carrier element 3, can be provided here.Furthermore, it can be seen that the adjusting device 15 is secured against falling out in the bore 14 by means of a securing screw 29.In FIGS. 5 to 8, the holder 2 is shown in detail. In FIGS. 9 to 12, the carrier element 3 is shown in detail.FIGS. 13 to 14 show the toggle screw 11 It can be seen a head 30 with an axial bore 31 for receiving the hand attachment 27, not shown. The head 30 is adjoined by a cylindrical shank 32 on which a T-shaped hammer head 33 is arranged at the end face. The shaft 32 has an annular groove 34 which serves to receive the securing ring 26. The securing ring 26 is designed as a snap ring.The hammer head 33 arranged on the end face of the shank 32 has a web 35 which carries a cross bolt 36 on the end face, so that two undercuts 37 are formed between the cross bolt 36 and the end face of the shank 32, with which undercuts the toggle screw 11 engages behind the cylinder pins 25 in order to pull the toggle screw 11 into the bore 24 in the axial direction.For secure fastening of the toggle screw 11, a disk spring 38 is also provided which is supported on the one hand on the head 30 of the toggle screw 11 and on the other hand on the end face of the leg 4 of the supporting element 3 and is prestressed when the toggle screw 11 is drawn into the bore 24.In FIGS. 17 to 20, the adjusting device 15 is shown in detail. The adjusting device 15 consists of a cylindrical first section 39 and a second cylindrical section 40 which is arranged eccentrically to the first section 39 on this first section 39. The section 40 has a smaller diameter than the section 39 and is arranged in such a way that a part of its outer surface corresponds to the outer surface of the section 39, as can be seen in particular in FIGS. 19 and 20.In the first section 39, an annular groove 41 is formed which is V-shaped in cross section and in which the securing screw 29 engages when the adjusting device 15 is mounted. By means of the securing screw 29, the adjusting device 15 is fixed in the axial direction in the bore 14.The second section 40 has a slot 42 on the end face, which serves for the attachment of a tool, not shown in detail, for example a screwdriver, in order to rotate the adjusting device 15 in the bore 14.By rotating the adjusting device 15, the section 40 is adjusted in the bore 13 of the section 12 so that the leg 4 is rotated about the shaft 32 of the toggle screw 11 via the outer circumferential surface of the section 40. This results in a slight pivoting of the leg 5 of the carrier element 3 relative to the holder 2, and as a result, a gripper inserted into the bore 6 and secured by the grub screw 9 can be moved with its tip slightly towards the needle or away from it, in order to bring the gripper into an optimum position relative to the needle when performing the sewing operation. Such an optimal position of needle and looper with respect to each other ensures that, on the one hand, a collision between looper tip and needle is prevented and, on the other hand, that the sewing process with needle thread and lower thread is carried out without errors.In Figs. 21 to 29, a second embodiment of a device is shown, which has a carrier element 103. The carrier element 103 has a first leg 104 and a second leg 105, which are oriented at right angles to one another.The second leg 105 has a bore 106 in the region of a free end, which serves to receive a cylindrical section of the gripper 101. The bore 106 is oriented at right angles to the longitudinal extent of the limb 105. Furthermore, the second leg 105 has on the end face a plug bolt 150 which is formed integrally with the leg 105 and tapers conically.Furthermore, the first leg 104 has a finger attachment 151 which extends at the free end of the first leg 104 at right angles to the longitudinal extent thereof. This finger attachment 151 serves for the actuation of a latching mechanism 152, which is described in more detail below.The holder 102 consists of two parts which are connected to one another to form an opening 116 for receiving a gripper shaft, not shown in detail. A first part 117 is substantially U-shaped and connected to a second part 120, which is likewise substantially U-shaped. The holder 102 is shown in detail in FIG. 27, wherein, however, the division of the holder 102 into the parts 117 and 120 is indicated by lines 153 in FIG. 27. The first part 117 has a plate-shaped section 154 with a bore 155. The bore 155 serves to receive the plug bolt 150 for securing the carrier element 103 on the holder 102. The second part 120 has a tongue-like portion 156 which is connected to the part 120 in a restricted elastic manner. The elasticity is provided here by two semicircular notches 157. Furthermore, the section 156 has an elongated hole 158 extending in its longitudinal direction and two latching hooks 159 as part of the latching mechanism 152. The latching hooks 159 arranged at a distance from one another form a guide in which a latching element 160 is guided. Between the latching hooks 159, a prism-shaped guide element is formed on the bottom side, which guide element guides the carrier element 103 when it is fastened to the holder 102, and fixes the carrier element 103 and holder 102 in a positive-locking manner in the end position. Thus, the carrier element 103 is positively fixed with regard to its attachment to the holder 102 by two positively locking and prism-shaped guides. Furthermore, in comparison with the prior art, no additional components are required with regard to the holder 102 in order to achieve the advantageous configuration.The elongated hole 158 serves to receive an adjusting device 115 which is screwed to the part 120 above the section 156, wherein the adjusting device 115 has an eccentric 114, which is mounted rotatably relative to a screw 113, wherein the screw 113 engages in the part 120 and the eccentric 114 partially abuts on the inner walls of the elongated hole 158, so that the section 156 can be laterally deflected relative to the part 120 of the holder 102 arranged above the section 156 via the rotation of the eccentric 114. To support this possible deflection, the notches 157 are provided.The latching element 160 interacts with the latching hook 159 of the latching mechanism 152, which is arranged at the free end of the limb 104 of the carrier element 103.The latching element 160 is located at an L-shaped end of the finger attachment 151 and, via the finger attachment, this end and thus the latching element 160 can be moved relative to the latching mechanism 152 in order to release the carrier element 103 from the holder 102.The carrier element 103 with the gripper 101, which is fixed in a rotationally fixed manner in the bore 106, is firmly connected to the holder 102 by the plug bolt 150 on the one hand and by the latching mechanism 152 on the other hand.By means of the adjusting device 115, namely the eccentric 114, the section 156 can be adjusted to the left or right and thus approximately in the direction of the longitudinal axis of the bore 106 within small limits. This adjustment also moves the latching element 160 in the latching mechanism 152 accordingly, resulting in a slight adjustment of the carrier element 103 relative to the holder 102. This relative movement of the carrier element 103 with respect to the holder 102 has the result that the tip of the gripper 101 is moved towards or away from a needle, not shown in detail, so that a fine adjustment of the gripper 101 with respect to the needle is possible via the adjusting device 115 without the holder 102 having to be released and moved beforehand on the gripper shaft, not shown in detail.The exact construction of the carrier element 103 can be seen from FIG. 26. In particular, it can be seen that the leg 104 is divided over approximately its entire length into two regions 107 and 108. An opening is formed between the regions 107 and 108. The free end of the region 108 merges into the finger attachment 151, which has the latching element 160 at its free end and engages with a projection 109 in a corresponding recess 110 at the free end of the region 107, at the same time is movable in this recess 110 in a limited manner in the longitudinal axis direction of the region 107, such that the projection 109 is movable via the finger attachment 151 in the direction of the limb 104 in order to release the latching element 160 from the latching mechanism 152, such that the carrier element 103 can subsequently be removed from the holder 102.This ensures that the carrier element 103 with the gripper 101 can be fastened to the holder 102 or can be detached therefrom in a simple manner, for example in order to convert the textile machine in its configuration with respect to the number of grippers 101 without the need for loosening screw connections, for example. The fastening of the support element 103 to the holder 102 is fixed by the plug bolt 150 whose outer diameter is matched to the inner diameter of the bore 155. In addition, the latching mechanism 152 is also designed in such a way that the latching element 160 cooperates in a positive-locking manner with the latching hooks 159, so that an adjustment of the gripper 101 relative to the needle, which is not shown in more detail, can only be effected to a limited extent via the actuating device 115. For this purpose, the adjusting device 115 can have key surfaces which make it possible to use a conventional jaw or ring key, so that simple adjustment of the adjusting device 115 is possible.In addition, the carrier element 103 has guide surfaces 111, 112 which interact with corresponding guides 118. These guides 118 are located in the region of the upper end face of the holder 102 and can be recesses which are V-shaped in cross section. Corresponding guides can also be provided in the region of the latching element 160 or the latching hook 159, so that relative movements of the components connected to one another are prevented via a positive connection and no large clamping forces are required for this purpose, as are required in the prior art. In the region between the latching element 160 and the latching hooks 159, a prismatic shape, for example with a V-shaped cross section, can also be provided. The guide 118 and the prismatic shape are formed here with openings aligned with one another. In this region, the surfaces are therefore only subjected to low forces during assembly or disassembly, so that the wear of these surfaces is also minimized and cannot be detected in practice.With the embodiment described above, a tool-free gripper change is possible. At the same time, fine adjustment of the gripper 101 relative to the needle is possible.The invention described above is not limited to the exemplary embodiments. Rather, modifications are possible which also fall within the scope of the invention. For example, instead of a toggle screw, another rotatable connection can also be provided, in which a bolt engages in a bore in the holder or the gripper shaft and carries out a positive connection with a latching element by rotation. A support for unused or additional grippers can also be provided, so that these are quickly available on site when the sewing machine is re-fitted. The support can be rail-shaped and extend over a substantial length of the sewing machine in the region of the sewing elements, in particular in the region of the looper shaft.Reference numerals denote reference numerals2 Holder 3 Carrier element 4 Leg 5 Leg 6 Bore 7 Bore 8 Internal thread 9 Grub screw 10 Bore 11 Toggle screw 12 Section 13 Slot 14 Bore 15 Adjusting device 16 Opening 17 First part 18 Leg 19 Screw 20 Second part 21 Threaded bore 22 Screw 23 Threaded bore 24 Bore 25 Cylinder pins (projection) 26 Securing ring 27 Hand shoulder 28 Gap 29 Securing screw 30 Head 31 Axial bore 32 Shank 33 Hammer head 34 Annular groove 35 Web 36 Cross bar 37 Undercut 38 Disk spring 39 First section 40 Second section 41 Annular groove 42 Slot 101 Gripper 102 Holder 103 Carrier element 104 Leg 105 Leg 106 Bore 107 Region 108 Region 109 Projection 110 Recess 111 Guide surface 112 Guide surface 113 Screw 114 Eccentric 115 Adjusting device 116 Opening 117 Part 118 Guide 120 Locking element is shown in FIG. 150 Plug-in bolt 151 Finger attachment 152 Locking system 153 Line 154 Section 155 Bore 156 Section 157 Notch 158 Slot 159 Locking hook 160 Locking element

Claims

Device for fastening a gripper (101) on a gripper shaft of a textile machine, having a carrier element (3; 103) for the gripper (101), wherein the carrier element (3; 103) for the gripper (101) is connected to a holder (2; 102) via a connecting element or can be connected to the gripper shaft via the connecting element in such a way that the carrier element (3; 103) for the gripper (101) is separated from the holder (2; The invention is also directed to a device for securing a gripping member to a gripping shaft, wherein the connecting element is configured as a toggle screw (11) or as a latch (152), wherein the toggle screw (11) rotatably engages a bore (10) in the support element (3) through a bore (10) in the support element (3) to rotatably engage a corresponding opening (24) in the support (2) or the gripping shaft, to engage behind an abutment, or wherein the latch (152) is configured as a positive connection between the support element (103) and the support (102).Device according to claim 1, characterised in that the holder (2; 102) is formed in two parts and has a receptacle (16; 116) for the gripper shaft.Device according to one of claims 1 or 2, characterised in that the carrier element (3; 103) is L-shaped and has two legs (4, 5; 104, 105), wherein one leg (5; 105) has a receptacle for the gripper (101) and a second leg (4; 104) has the bore (10) for receiving the toggle screw (11) or a first part of the latching mechanism (152).Device according to one of Claims 1 to 3, characterized in that the toggle screw (11) has, at its end facing the holder (2), a T-shaped hammer head (33) which engages behind a projection (25) in an opening (24) in the holder (2) or the gripper shaft, and in that the toggle screw (11) is braced with respect to the holder (2) or can be braced with respect to the gripper shaft by means of a spring (38).Device according to one of Claims 1 to 4, characterized in that the toggle screw (11) is secured against falling out on the carrier element (3) by a securing ring (26).Device according to claim 3, characterised in that the two legs (104, 105) of the carrier element (103) run at right angles to one another, wherein one (104) of the legs (104, 105) has a latching element (160) of the latching mechanism (152).Device according to one of claims 1 to 3 or claim 6, characterised in that the carrier element (103) has first connecting elements which are arranged in second correspondingly formed connecting elements of the holder (102) or gripper shaft, so that the carrier element (103) is connected positively to the holder (102) or can be connected to the gripper shaft.Device according to one of Claims 1 to 3, 6 or 7, characterized in that the carrier element (103) is designed to be flexurally elastic.Device according to one of Claims 1 to 3 or one of Claims 6 to 8, characterized in that the carrier element (103) has a finger attachment (151).

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