WO2000056969A1

WO2000056969A1 - Device on sewing or embroidery machines, for changing the bobbin for the gripper thread

Info

Publication number: WO2000056969A1
Application number: PCT/EP2000/002072
Authority: WO
Inventors: Philipp Moll; Haruhiko Kinoshita
Original assignee: Kinoshita Precision Industrial Co. Ltd.
Priority date: 1999-03-23
Filing date: 2000-03-13
Publication date: 2000-09-28
Also published as: JP2002539867A; CN1120907C; CN1344340A; KR20020010130A; DE19913043A1; DE19913043C2

Abstract

The invention relates to a device for double back stitch sewing or embroidery machines for changing the bobbin capsule that receives the bobbin and that is itself received by a gudgeon, which is located inside the lower capsule of the gripper. The inventive device comprises a receiving device, which has a support with several adjacent receiving areas for the bobbin capsules and a gripping device for transferring the bobbin capsules with full bobbins from the changeover position of the receiving device to the gripper and for transferring the bobbin capsules with empty bobbins from the gripper to the changeover position of the receiving device. The changeover position of the receiving device is positioned directly to the side of the gripper, on essentially the same axis, and the gripping device can be moved along a path between the gripper and the changeover position of the receiving device that is oriented essentially parallel to the gripper axis.

Description

Device on sewing or embroidery machines for changing the bobbin for the hook thread

The invention relates to a device on lockstitch sewing or embroidery machines for changing the bobbin for the hook thread according to the preamble of claim 1.

Lockstitch sewing machines usually have a hook with a hook tip that grips the needle thread loop and with a lower capsule mounted in the hook with a bobbin case received by the hook. The lower capsule is provided with a pin which is arranged coaxially with the axis of the hook and which, when the bobbin case is inserted in the lower capsule, engages in a hollow cylinder arranged in the latter, which in turn bears the bobbin holding the hook thread supply.

To secure the bobbin case on the peg of the lower capsule, the latter is provided in the area of its free end with an incision into which a locking bolt provided on the bobbin case engages. The locking bar is displaceable in the bobbin case against the force of a spring and has an opening for the passage of the pin which is larger than the diameter of the pin by a certain amount. The locking bolt thus secures the bobbin case in one of its end positions against falling out of the lower capsule and can be moved into its other end position, in which the bobbin case is released, against the force of a spring against the force of a spring by means of a flap which is pivotably arranged on the bobbin case and is movably connected to the locking bar can be removed from the lower capsule or from the gripper. In order to prevent the bobbin from falling out of the bobbin case in this position of the locking bolt, and thus in particular both during insertion and during removal of the bobbin case, on Locking bolt provided a nose bent substantially at right angles, which protrudes through a recess provided in the wall of the coil capsule in the interior thereof and secures the coil against falling out of the coil capsule.

In order to facilitate the operation of the flap, the free end of the flap is bent slightly away from the bobbin case and can be relatively easily gripped by the operator to remove the bobbin case from the lower capsule and to insert it into the lower capsule.

Since the bobbin can only take up a relatively small length of the hook thread and therefore frequent changing of the bobbin with the associated removal and reinsertion of the bobbin case is required, devices for changing the bobbin or the bobbin case have become known which involve manual changing of the bobbin with technical Imitate funds.

Such devices are shown for example in JP 8-196 766 and US Pat. No. 5,718,181.

Thus, the device according to JP 8-196766 has a hook held by a movable carrier, which engages behind the flap to remove the bobbin case and gives it a swiveling movement corresponding to the manual movement, at the end of which the flap rests on a support formed on the carrier is coming. As a result, the locking bar carries out a corresponding transverse movement, as a result of which the bobbin case is released and, together with the bobbin, can be moved out of the lower capsule by the carrier which can move on a predetermined path. Here, the movement path is designed in such a way that the carrier is guided in a form-fitting manner and first executes a movement parallel to the axis of the gripper, which then changes into a swiveling movement, which is followed by an obliquely downward movement, at the end of which the bobbin case a cassette arranged below and to the side of the gripper is transferred. Analogously to this, a bobbin case equipped with a filled bobbin is inserted into the lower capsule.

Since the bobbin case is thus held non-positively both during its movement from the gripper to the cassette and during the movement from this to the gripper by the hook, the hook must exert a correspondingly large pressing force on the flap during the entire duration of these movements.

Also in the device according to the aforementioned US-PS, a flap engaging hook is provided for gripping the bobbin case, which analogously to the device according to JP 8-196766 the flap during the movements of the bobbin case from the gripper to the cassette or from this to the gripper against one press the appropriate stop. Since a tongue is simultaneously formed on this stop, which engages in a flap provided in its end position in a recess provided on the flap anyway, the bobbin case is held during its aforementioned movements partly positively and partly non-positively.

It is also disadvantageous here that the transfer of the bobbin case from the gripper to the cassette and from this to the gripper takes place by several different movements, so that this device is also relatively complicated.

The invention is therefore based on the object of improving a generic device in such a way that, on the one hand, the detection and holding of the bobbin case is simplified and, on the other hand, the design effort for changing the bobbin is reduced.

This object is achieved in a generic device in that the changing position of the receiving device is provided immediately to the side and essentially coaxially with the gripper, and the gripping device is movable along a path which is essentially parallel to the axis of the gripper between the latter and the changing position of the receiving device. The arrangement according to the invention of the changing position of the receiving device not only considerably simplifies the handling of the bobbin case to be transferred, but rather results in an extremely short path for transferring the bobbin case from the pick-up device to the gripper, or from this to the pick-up device Receiving device and the bobbin case inserted into the gripper is reduced to the amount required for the needle thread to pass through, is only slightly larger than the width of the bobbin case. On the one hand, the design effort for transferring the bobbin case is significantly reduced, and on the other hand, due to the short path for the gripping device, there is also a corresponding time saving, which has a particularly strong effect in view of the fact that the gripping device has to cover this distance twice per changing operation .

It is obvious that the teaching according to the invention is independent of both the type and the position of the hook in the sewing machine. It does not matter whether it is a rotating gripper or a so-called vibrating gripper. It is equally irrelevant whether the hook rotates around a shaft parallel to the main shaft of the sewing machine or around a shaft that is transverse to the main shaft. The teaching according to the invention can even be used in sewing machines with a hook rotating around a vertical shaft.

A space-saving solution, which at the same time allows the bobbin capsules to be simply carried away with empty bobbins, is obtained when the receiving device can be pivoted about an axis that runs parallel to the gripper at a distance from it.

An alternative to this can be achieved if the pick-up device can be pivoted about an axis that runs transverse to the axis of the gripper and intersects it.

It is advantageous if the receiving device can be moved in the vertical and / or horizontal direction. Coil capsules of conventional design are provided for gripping and handling with a pivotable flap, the pivoting movement of which at the same time causes a displacement of the locking element which engages in an incision in the pin of the lower capsule and which is usually designed as a locking slide, whereby the coil capsule is released for removal from the gripper.

A solution that on the one hand can do without the flap that has been customary since then and on the other hand eliminates jamming or jamming of the bobbin case during its transfer from the gripper to the changing station of the receiving device results from the fact that the gripping device has two holding elements that can be moved on a slide parallel to the axis of the gripper for the bobbin case, of which the first holding element is provided with a holding finger which can be inserted in the direction of movement of the gripping device into a recess provided on the bobbin case and the second holding element has a holding lug which, when acting on the locking slide, can also be moved transversely to the longitudinal axis of the bobbin case .

To achieve the transverse movement of the second holding element, it can be pivotably mounted on the first holding element.

For the two holding elements, there is a relatively short way of grasping the bobbin case if the recess for the first holding element is provided on the bottom of the bobbin case and the locking slide has an undercut adjacent to the recess, which is undercut by the holding lug of the second holding element.

A solution in which the locking element is considerably simplified results from the fact that the locking element is designed as a double leg spring with two legs directed essentially parallel to one another, one leg of which lies in the locking position of the locking element within the incision of the pin of the lower capsule and can be transferred into its release position by the gripping device. The double leg spring can also serve at the same time to secure the coil inside the bobbin case if the free end of one leg of the double leg spring is bent essentially at a right angle and projects into the receiving space of the bobbin case for the coil when the double leg spring is in the release position .

To release the bobbin case for removal from the gripper while simultaneously securing the bobbin against falling out of the bobbin case, a variant of the first gripping device has a spreading device for the double leg spring, which is provided with two fingers, which is moved by a slide that can be moved parallel to the axis of the gripper are movable between the legs of the double leg spring, wherein the leg unlocking the bobbin case is additionally movable transversely to the movement path of the slide.

Safety beyond this for holding the bobbin case can be achieved if the gripping device has a magnet carried by the slide, which cooperates with the end face of the bobbin case.

In order on the one hand to easily remove the empty Spulenkapselπ from the receiving device and on the other hand to be able to re-equip it with bobbin cases with a filled bobbin, the carrier is detachably connected to it and can be locked with it by means of a quick-release fastener. As a result, the take-up device can be re-equipped with bobbin capsules with filled bobbins at a separate point, regardless of the respective sewing process.

A particularly simple solution for driving the gripping device, which as a whole only requires a linear movement thereof, is appropriate if the gripping device can be moved from the side of the carrier facing away from the gripper to the gripper. In order, in particular, to be able to insert spool capsules with the filled spool into the gripper in the correct position, the receiving device has means for fixing the spool capsules in the correct position in the receiving device.

A particularly advantageous and also economically producible solution is achieved if the means for fixing the bobbin case are formed by two substantially vertically oriented and spaced-apart pins which protrude into a recess in the bobbin case, the mutual distance between the pins The distance between the fixing pins arranged in the lower capsule for the coil capsule corresponds and the recess in the coil capsule which interacts with the fixing pins to fix them forms the recess for the pins of the receiving device.

Further fixing options for the bobbin cases on the carrier result from the fact that the latter has a plurality of webs which are essentially parallel to its path of movement, each of the webs being provided with a guide groove for the locking element of the bobbin case, or if the carrier has several substantially parallel to its path of movement has directed and spaced apart sleeves, which are each provided with a cooperating with the locking element of the bobbin case guide groove.

The invention is based on the further object of simplifying the gripping device for detecting and transporting the bobbin cases from the gripper to the receiving device or from this to the gripper in such a way that the holding elements no longer require any parts which can be moved relative to one another.

This object is achieved by using a specially designed bobbin case in that the gripping device has a plurality of holding elements for the bobbin case movable on a slide parallel to the axis of the gripper, which can be inserted into openings provided in the bottom of the bobbin case and substantially parallel to the longitudinal axis thereof to the Detecting the bobbin case are movable within the openings transversely to the direction of movement of the gripping device.

It is advantageous here if the openings are designed as stepped bores, the large bore of which opens into the receiving space of the bobbin case for the bobbin.

An extremely simple possibility for grasping the bobbin case results from the fact that the holding pins can be pivoted about an axis running parallel or transverse to their longitudinal direction.

A securing of the coil during the transfer of the bobbin case 101 from the gripper to the receiving device or from this to the gripper is achieved if at least one holding spring for the coil is assigned to the holding pins, which is directed essentially parallel to the latter and when moved into the openings Holding pin engages in a slot provided in the housing of the bobbin case.

A structurally simple solution for moving both the retaining spring and the retaining pin results from the fact that the retaining spring and the retaining pin are received by a common carrier and this is connected to the carriage.

In order to be able to grasp and move the bobbin case in both directions with the holding pegs, pressure elements are provided on the holding pegs adjacent to the drivers, which are designed as cones, the small diameter of which is equal to or smaller than the small diameter of the stepped bores and the large diameter of which is larger than the small diameter of the stepped bores.

The locking slide, which is complex in terms of its structure and in particular with regard to the initiation of its movements and its handling, can be omitted if the locking element is formed by a ring which is arranged within a cut provided in the hollow pin of the coil capsule and in a radial direction Direction is elastically deformable.

It is particularly simple here if the elastic deformation of the locking element can be brought about by the axial movement of the coil capsule that can be initiated by the holding pins.

In order to be able to dispense with a separate initiation of the movement for the locking element within the receiving device, the support arms for receiving the coil capsules each have a receiving pin, which are provided in the region of their free end with an incision that the incision on the pin corresponds to the lower capsule, the diameter of the receiving pin corresponding to the diameter of the pin of the lower capsule.

To secure the coils or coil capsules received by the receiving pins, each receiving pin is assigned at least one retaining spring which extends parallel thereto and which engages in a slot provided in the coil capsule when pushed onto the receiving pin.

Further advantages and details of the invention result from the description of exemplary embodiments shown in the drawing.

It shows:

1: an end view of the device according to the invention together with an end view of the base plate of a sewing machine;

2 shows a plan view of a lower capsule of a gripper which is formed in the usual way;

3a: a first embodiment of a bobbin case for use in the device according to the invention in a sectional view with the locking element locked;

3b: an end view of the bobbin case according to FIG. 3a; 4a: a sectional view of the bobbin case according to FIG. 3a with unlocked locking element;

4b: an end view of the bobbin case according to FIG. 4a;

5a: a second embodiment of a bobbin case for use in the device according to the invention in a sectional view with the locking element locked;

5b: an end view of the bobbin case according to FIG. 5a;

6a: a sectional view of the bobbin case according to FIG. 5a with the locking element unlocked;

6b: an end view of the bobbin case according to FIG. 6a;

7a: an illustration of the holding elements of a first embodiment of a gripping device in its rest position;

7b: an illustration of the holding elements according to FIG. 7a in their operative position;

8a: a side view of a second embodiment of a gripping device in the fingers in its rest position;

8b: an illustration of the gripping device according to FIG. 8a with fingers in their active position;

9a-9c: different embodiments of the receiving places for the Spuienkapseln within the receiving device in a sectional view;

10a-10c: first views of the different embodiments of the receiving places for the bobbin cases within the receiving device in the direction of view of the gripper;

11a-11b: a sectional view and an end view of a receiving space for the bobbin case in the receiving device in the direction of view of the gripper;

Figure 12 is an illustration of the cradle for the wearer

13 shows a schematic illustration of the overall arrangement of the device according to the invention;

14 shows a sectional illustration of a further embodiment of the bobbin case;

15: a top view of the bobbin case according to FIG. 15;

16a: an illustration of the holding elements of a third embodiment of a gripping device in its rest position;

16b: an illustration of the holding elements according to FIG. 16a in their operative position; 17: a detail of the holding elements;

18: a receiving space for the third embodiment of the bobbin case 101 within the receiving device;

Fig. 19a-19d: a schematic representation of the process of transferring a bobbin case 101 from the gripper to a receiving location on the receiving device.

In FIG. 1, the base plate 1 of a sewing machine is indicated in dash-dot lines, which has a hook 3 rotating around a horizontal axis 2, which in a known manner cooperates with a thread-guiding needle (not shown) to form a seam.

In the gripper 3, a lower capsule 4 is mounted in the usual way, which is used to hold a bobbin case 5, which carries a bobbin 6 receiving the thread supply. Although the lower capsule 4 has no changes compared to the known designs of such a lower capsule, FIG. 2 shows an end view of the lower capsule 4, in which the parts thereof relevant to the present invention are shown. For the axial fixation of the bobbin case 5, the lower capsule 4 has a pin 7 which is arranged coaxially to the axis 2 and which is provided in the area of its free end with an incision 8 which cooperates in a known manner with a blocking element of the bobbin case 5 to be described later. In its upper area on the inside of the lower capsule 4 there are two fixing pins 9 which are arranged at a distance from one another and which, when the coil capsule 5 is inserted into the lower capsule 4, protrude into a recess 10 provided on the circumference thereof and secure the coil capsule 5 in the radial direction.

The first embodiment of the bobbin case 5 shown in FIGS. 3 and 4 differs from conventional bobbin cases to the extent that the pivotable flap which is usual there has been eliminated.

The bobbin case 11 according to the invention has a housing 12 which is provided with a hollow pin 13, which in a known manner Includes a coil 6. At the front of the bobbin case

11, a dovetail-like guide is also provided in a known manner for a locking element designed as a locking slide 14, which is arranged to be displaceable transversely to the longitudinal axis of the bobbin case 11. The locking slide 14 is provided with a stop 15 shown in FIGS. 3b and 4b, which acts against a spring 16 arranged in the housing 12 and presses the locking slide 14 relative to FIGS. 3 and 4 to the right. In this position of the locking slide 14 is its right-angled and a hook-shaped nose 17 forming right end outside the bobbin case 11. The coil 6 is thus free.

The locking slide 14 also has a recess 18 which is stepped in the region of its left end. In this way, a lock 19 is formed on the locking slide 14, which in plan view has approximately the shape of a crescent, which, when the bobbin case 11 is inserted into the lower capsule 4, projects into the incision 8 in the pin 7 and secures the bobbin case 11 in the axial direction.

In order ^" to limit the freedom of movement of the locking slide 14 when the bobbin case 11 is removed from the lower capsule 4, a screw acting as a stop 21 is screwed into the locking slide 14, the free end of which screw is provided in a bottom of the housing 12 of the bobbin case 11 (not shown in detail) ) Recess protrudes.

In the release division of the bobbin case 11 shown in FIG. 4, the nose 17 of the locking slide 14 projects in the usual manner in the housing

12 of the bobbin case 11 provided recess 20 and engages under the upper flange of the coil 6, so that the latter is secured against falling out of the bobbin case 11.

As will be explained in more detail later, a gripping device, which acts directly on the locking slide 14, serves to move the locking slide 14 from its locking position shown in FIG. 3 into the release position shown in FIG. 4 for the bobbin case 11. 3 and 4- in the left-hand area of the blocking Slider 14 a recess 22 is provided, which is arranged and shaped such that it partially overlaps with the recess 23 already present in the bobbin case 11. A holding element of the gripping device reaching through the two recesses 22 and 23 can therefore come to rest on the right-hand boundary surface of the recess 23 of the bobbin case 11. The recess 22 also has an undercut 24 for a holding element of the gripping device.

Finally, as can be seen from FIGS. 3b and 4b, the bobbin case 11 has a recess 25 in its upper region, the lateral boundary surfaces of which, when the bobbin case 11 is inserted in the lower case 4, interact with the fixing pins 9 of the lower case 9 and the bobbin case 11 in secure radial direction.

In the further embodiment of the bobbin case shown in FIGS. 5 and 6, the flap which has been customary since has also been omitted. Compared to the first embodiment of the bobbin case 11, the locking slide 14 has also been eliminated and replaced by a locking element formed by a double leg spring. The bobbin case 31 of the second embodiment thus has the above-mentioned double leg spring 32 as a blocking element, one leg 33 of which, in relation to FIG. 5, extends essentially horizontally and lies within the upper guide for the locking slide since then. The free end of this leg 33 initially runs obliquely downward and is angled substantially at right angles to form a nose 34. In the locked position of the bobbin case 31, the nose 34 does not protrude through the recess 20 provided in the housing 12 of the bobbin case 31, so that the bobbin 6 is free.

The leg 33 of the double leg spring 32 is connected via a web 35 to the second leg 36 which runs almost parallel to it and which, in the locked position of the bobbin case 31, lies within the incision 8 of the pin 7 of the lower capsule 4, as a result of which the bobbin case 31 is in the axial direction Direction is set. The leg 36 is 5b and 6b - bent back in the form of a loop in its right-hand area, so that its area 37 lies within the lower guide for the locking slide since then. The leg 33 and the region 37 of the leg 36 thus run at almost the same height within the guide for the locking slide 14 since then, while the leg 36 extends somewhat above it. As can be seen from FIGS. 5 and 6, the area 37 is bent again at right angles in the horizontal plane and runs below the web 35 almost parallel to this up to the recess 23 of the housing 12 of the bobbin case 31 and is locked there. If the right area of the leg 33 is supported by an element of a gripping device and at the same time the lower leg 36 of the double leg spring 32 is pressed downwards by a further element of the gripping device, then the movement of the, as can be seen from FIGS. 5b and 6b Leg 36 out of the area of the incision 8 of the pin 7, the nose 34 of the leg 33 simultaneously moving to the housing 12 of the bobbin case 31 and - projecting through the 20 recess in the housing 12 - comes into contact with the upper flange of the bobbin 6 and this prevents the coil 6 from falling out when the bobbin case 31 is unlocked.

7a and 7b show a first embodiment of a gripping device 40 according to the invention which interacts with the first embodiment of the bobbin case, namely with the bobbin case 11. The gripping device 40 has two holding elements 41, 42, the holding element 41 being fixedly connected to a slide 43 which is displaceable along a guide track 44 which is parallel to the axis 2 of the gripper 3 and is secured thereon against rotation. The holding element 41 is provided with a holding finger 45 which, in its operative position, comes to rest on a boundary surface of the recess 23 in the housing 12 of the bobbin case 11. The holding element 42 is pivotally mounted on the holding element 41 and has a holding nose 46, which — as seen in the longitudinal direction of the two holding elements 41, 42 — is somewhat behind the holding finger 45 and engages in the undercut 24 of the bobbin case 11 in its operative position.

For this purpose, the carriage 43 carrying the two holding elements 41, 42 moved along the guide track 44 by a drive which can be carried by a fixed frame 47 and can be formed as a cylinder or magnet 48. The cylinder / magnet 48 engages via an angle lever 49 mounted on the frame 47, which in turn engages the slide 43 via a pin / slot connection and moves it against the force of a spring 50 to the gripper 3 and thus to the bobbin case 11. At the end of this longitudinal movement, the holding element 41 has reached its operative position and lies, protruding through the recess 22 of the locking slide 14, against a boundary surface of the recess 23 provided in the housing 12 of the bobbin case 11. The retaining lug 46 is also located within the recess 22 of the locking slide 14, but not yet in the region of the undercut 24 of the same.

During the following pivoting movement of the holding element 42, which can be brought about by a magnet which engages on this and is carried by the holding element 41, the holding lug 46 is guided into the region of the undercut 24. The retaining lug 46 lies against a boundary surface of the recess 22 provided in the locking slide 14 at the same time, so that the locking slide 14 executes a transverse movement, as a result of which on the one hand its bolt 19 is guided out of the incision 8 in the pin 7 of the lower capsule 4 and on the other hand the nose 17 of the locking slide 14 through the 20 recess into the interior of the housing 12 of the bobbin case 11. So that the coil 6 is secured against falling out of the bobbin case 11 at the same time.

Since, during the transverse movement of the locking slide 14 caused by the pivoting movement of the retaining lug 46, the retaining finger 45 of the retaining element 41 protrudes through the recess 22 provided in the locking slide 14 into the recess 23 provided in the housing 12 of the bobbin case 11 and bears against a boundary surface thereof the bobbin case 11 is supported against lateral forces during the transverse movement of the locking slide 14; jamming of the bobbin case 11 on the pin 7 is avoided. The locking slide 14 thus captured by the two holding elements 41, 42 remains during the subsequent backward movement of the Gripping device, which is caused by the relaxing spring 50, in this position. In this position, the bobbin case 11 is guided along a path parallel to the axis 2 of the gripper 3 to the change station of the receiving device provided immediately to the side of the gripper 3 and fixed there in a manner to be described later.

8a and 8b show a second embodiment of a gripping device 60 according to the invention which interacts with the second embodiment of the bobbin case, namely with the bobbin case 31, the locking element of which is formed by a double leg spring 32. To unlock the double leg spring 32, the gripping device 60 has a spreading device 63 comprising two fingers 61, 62, which likewise can be moved from the changing station to the gripper, or from there to, by means of a slide 65 which can be displaced along a guide path parallel to the axis 2 of the gripper 3 Exchange station is movable. Because the drive to achieve this longitudinal movement of the carriage

65 may be identical to drive the first embodiment of the gripping device, is used below on this drive. Accordingly, the carriage 65 also moves along the guide track 44 and is moved in the manner described above by the cylinder or magnet 48 or by the spring 50.

The finger 61 is rigidly attached to the carriage 65 and has a gradation

66, while the finger 62 is pivotally mounted on the carriage 65 or on the finger 61. The finger 61 or its gradation 66 acts with the leg 33 of the double leg spring 32. The finger 61 is also provided with an actuating means, which can be formed, for example, by a magnet 67, in order to pivot the finger 62 downward. This pivoting movement can take place against the force of a spring, which is not described in any more detail, and which then returns the finger 62 to its starting position. The finger 62 has a pressure surface 68 which interacts with the leg 36 of the double leg spring 32. As can be seen from FIGS. 8a and 8b, a magnet 69 is provided on the slide 65, the armature of which is directed parallel to the guide track 44. To unlock the bobbin case 31, the cylinder or magnet 48 moves the slide 65 against the force of the spring 50 to the gripper 3. In the operative position of the expanding device, the finger 31 assumes a position in which the step 66 rests on the underside of the leg 33, the finger 62 is pivoted downward and presses the leg 36 with its pressure surface 68 downward, this moving out of the incision 8 of the pin 7 and thus releasing the bobbin case 31. Simultaneously to this, the force 34 of the pressure surface 68 on the leg 36 moves the nose 34 of the leg 33 to the inside of the bobbin case 31, whereby the nose 34 comes into contact with the flange of the bobbin 6 and thus secures the bobbin 6 against falling out of the bobbin case 31. Now the armature of the magnet 69 moves against the front of the released bobbin case 31 so that it can be taken along during the subsequent return movement of the carriage 43 and brought to the changing station.

The device according to the invention has a receiving device 70 for the bobbin cases, which is equipped with a carrier 71. This is provided with a plurality of receiving spaces 73 for the coil capsules and can be pivoted about an axis 72. The axis 72 can be arranged vertically or horizontally, depending on the space available in the corresponding sewing machine. It is important that the bobbin cases in their changing position assume a position that corresponds to their position in the gripper 3. This means that the receiving locations 73 and their holding means for the coil capsules are arranged or formed in the carrier 71 such that the longitudinal axis of the coil capsules in their changing position is coaxial with the axis 2 of the gripper 3 and the coil capsules in the changing position with respect to their position in the gripper 3 are displaced axially so far that there is at least a minimal distance between the hook 3 and the respective bobbin case or the carrier 71, which does not hinder the normal sewing process.

In the embodiment of the invention shown in more detail, the axis 72 of the receiving device 70 is arranged parallel to the axis 2 of the gripper (3). The receiving device 70 is received by a carriage 74 which does not run along in one is shown in detail frame arranged guide rods slidably arranged in the vertical direction 74. Since the carriage 74 also serves to receive the axis 72, the receiving device 70 can be rotated about the axis 72 and, if the space available in the sewing machine should not be sufficient for this purpose, can be moved up and down in addition to the rotary movement. A magnet 80, which is accommodated by the frame (not shown in more detail) and which acts on the carriage 74 either directly or via a stepping mechanism, is used to drive the carriage 74.

In the embodiment shown, the carrier 71 is provided with four support arms 75, which consequently has a total of 4 receiving spaces 73 for the coil capsule. The carrier 71 is pivoted at intervals of 90 degrees around the axis 72, so that each of the receiving places 73 gradually reaches the changing position. Of course, the carrier 71 can also have more than four receiving spaces 73 and be clocked accordingly.

9a to 9c and 10a to 10c show different possibilities for the specific design of the receiving locations 73 for the bobbin cases 11.

9a and 10a, the support arm 75 has a receiving pin 76, the diameter of which corresponds essentially to the diameter of the pin 7 of the lower capsule 4, so that the coil capsule 11 on the receiving pin 76 under the same tolerance conditions as in FIG the lower capsule 4 is received. In its area protruding into the locking slide 14, the receiving pin 76 is provided with an eccentric extension 77 which projects into the recess 18 of the locking slide 14. When the holding elements 41, 42 or the holding fingers 45 and the holding lug 46 have moved out of its recess 22, the blocking slide 14 thus maintains its position since then, in which the lug 17 projects through the recess 20 in the housing 12 of the bobbin case 11 , engages one of the flanges of the coil 6, and holds them in the bobbin case 11. To secure the radial position of the bobbin case 11, two pins 78 are provided, which are in a shoulder 79 of the carrier 71 recorded and directed vertically to the axis of the bobbin case 11; their mutual distance corresponds to the mutual distance of the fixing pins 9 of the lower capsule 4. The pins 78 protrude into the recess 25 of the bobbin case 11, so that this is secured in the changing position in the radial direction in the same way as in the lower capsule 4.

As can be seen in particular from FIG. 10 a, the support arm 75 is located to the side of the recess 22 of the bobbin case 11, so that the holding elements 41, 42 can pull the bobbin case 11 freely onto the receiving pin 76.

In the embodiment of the receiving locations 73 according to FIGS. 9b and 10b, the support arm 75 has a receiving pin 81, the diameter of which also essentially corresponds to the diameter of the pin 7 of the lower capsule 4. Instead of the eccentric projection 77, the receiving pin 81 has an angled web 82 which is directed parallel to the movement path of the slide 43 and has a guide groove 83 for the nose 17 of the bobbin case. As a result, when the gripping device 40 completely moves the bobbin case 11 onto the receiving pin 81 and has released it 11, the locking slide 14 is held in its position in which the bobbin 6 is locked. At the same time, the radial position of the bobbin case 11 is secured by the nose 17 projecting into the guide groove 83. As can be seen in particular from FIG. 10 b, the support arm 75 is also located here to the side of the recess 22 of the bobbin case 11, so that the holding elements 41, 42 can pull the bobbin case 11 onto the receiving pin 81 unhindered.

9c and 10c, a sleeve 84 is arranged on the support arm 75, the inside diameter of which essentially corresponds to the outside diameter of the bobbin case 11. The sleeve 84 is open on its end face facing the gripper 3; on its end face facing away from the gripper 3, the sleeve 84 can be provided with a bottom 85 which serves an opening 86 for the passage of the holding elements 41, 42 of the gripping device 40. The sleeve 84 has on its inside a guide groove 83 for the nose 17 of the locking slide 14. Here too the Locking slide 14, when the gripping device 40 has moved the bobbin case 11 completely into the sleeve 84 and has released the bobbin case 11, is held in its position in which the bobbin 6 is locked. At the same time, the radial position of the bobbin case 11 is secured by the nose 17 projecting into the guide groove 87.

11a and 11b show an embodiment of the receiving locations 73 for a bobbin case 31 within the receiving device 70. A receiving pin 88 is also provided here, the diameter of which essentially corresponds to the diameter of the pin 7 of the lower capsule 4, so that the coil capsule 31 is received on the receiving pin 88 under the same tolerance conditions as in the lower capsule 4. At its end facing away from the gripper 3, the receiving pin 88 has a prismatic extension 89, the width of which essentially corresponds to the width of the locking slide 14 of the bobbin case 11. As soon as the bobbin case 31 is pushed onto the receiving pin 88 by the fingers 61, 62 of the gripping device 60, its extension 89 engages in the guide provided in the bobbin case 31 for the locking slide 14; the bobbin case 31 is thereby secured in a radial position. Since the extension 89 prevents the double leg spring 32, which assumes its blocking position, from moving back into its position releasing the coil 6, the nose 34 of the leg 33 also remains in its position, which prevents the coil 6 from falling out of the bobbin case 31.

In order to be able to gradually rotate the receiving device 70 about the axis 72 by an angular amount corresponding to the number of the provided receiving places 73, a drive device 90 (FIG. 12) is provided which has a magnet 91. A slide 92 is articulated to the armature of the magnet 91 and can be moved along a guideway formed on the horizontal region of a bracket 93. The guideway can be formed by a slot 94 machined into the bracket 93, into which the lower end of the slide 92 engages. The slide 92 has a driver 95 which interacts with pins 96 of an index disk 97 arranged on the axis 72 carrying the receiving device 70. In the embodiment shown, the magnet 91 leads per switching Step two working strokes against the force of a spring 98 acting on the bracket 93 and on the other end on the slide 92, the index disk 97 after each switching step by a spring-loaded locking ball 99, which engages in corresponding incisions 100 in the index disk 97 the respective position is locked.

For the following description of the procedure, the situation shown in FIG. 13 is assumed, according to which the four receiving places 73 of the receiving device 70 are each equipped with a bobbin case 11 with filled bobbin 6 and there is no bobbin case 11 in the gripper 3. The locking slides 14 of the bobbin capsules 11 assume their position locking the respective bobbin 6. The receiving device 70 with its carrier 71 is located directly to the side of the gripper 3, the axis of the bobbin case 11 located in the changing position on one of the pins 76, 81 or within a sleeve 84 being aligned with the axis of the gripper 3 and the gripping device 40 is located with its holding elements 41, 42 - based on FIG. 13 - to the left of the carrier 71. This situation occurs when the bobbins 6 of all the bobbin cases 11 have been worked empty by the preceding sewing processes, and the carrier 71 has been filled with four bobbin cases 11 with filled bobbins 6 in a loading point located outside the sewing machine.

Proceeding from this, the carriage 43 is moved to the right on its guide track 44 so that the holding finger 45 of the holding element 41 moves through the recess 22 in the locking slide 14 into the recess 23 of the bobbin case 11. As a result of the subsequent pivoting movement of the holding element 42 initiated by the magnet 51, the holding lug 46 reaches the area of the undercut 24 of the locking slide 14. The bobbin case 11 thus captured becomes the corresponding receiving pin 76 or 81 during the further longitudinal movement of the slide 43 Leaving sleeve 84, inserted into the gripper 3 or in its lower capsule 4 and picked up by the pin 7 thereof. The nose 17 of the locking slide 14 is still in its position locking the coil 6; also the Holding lug 46 is still in its position allowing the displacement of the bobbin case 11 on the pin 7, so that the bobbin case 11 can be fully inserted into the gripper 3 or its lower capsule 4 and assumes its sewing position.

Before the start of the backward movement of the carriage 43, the holding lug 46 of the holding element 42 is released by the magnet 51, so that it moves out of the undercut 24 in the locking slide 14. After the holding elements 41, 42 are withdrawn from the area of the locking slide 14, the spring 16 arranged in the bobbin case 11 moves the locking slide 14 into its locking position locking the bobbin case 11, the nose 17 of the locking slide 14 simultaneously in its position releasing the coil 6 is moved. The carriage 43 is also moved back into its starting position.

During the now following sewing process, the carrier 71 of the receiving device 70 remains in its position until the bobbin

6 is worked empty. The receiving space 73 of the carrier 71, which is in the changing position, is thus empty.

In order to change the bobbin case 11 carrying the empty bobbin, the carriage 43 is moved again to the gripper or to the bobbin case 11. The holding element 41 moves through the recess 22 in the locking slide 14 through into the recess 23 provided in the bottom of the bobbin case 11 and comes to rest on a lateral boundary surface thereof. The magnet 51 pivots the holding element 42, whereby its holding lug 46 is pivoted into the region of the undercut 24 in the locking slide 14. During this pivoting movement, the holding element 42 bears against a lateral boundary surface of the recess 22 and in the process shifts the locking slide 14 into its pin

7 releasing position; the nose 17 of the locking slide 14 is guided into its locked position for the coil 6 and secures it against falling out of the bobbin case 11. The bobbin case 11 thus captured can empty during the now moving backward movement of the carriage 43 to the one in the changing position Recording place 73 of the carrier 71 are performed. If the carrier 71 or its receiving places 73 are designed to receive the coil capsules 11 in accordance with FIG. 9c and accordingly has a sleeve 84, the holding elements 41, 42 of the gripping device 40 move through the sleeve 84 and thereby move the corresponding coil capsule 11 into the Sleeve 84. The nose 17 of the locking slide 14, which is in its locked position for the coil 6, projects into the groove 87 of the sleeve 84 and secures the bobbin case 11 within the sleeve 84 against rotation. Since the inside diameter of the sleeve 84 essentially corresponds to the outside diameter of the bobbin case 11, and the locking slide 14 cannot move to the right, based on FIG. 9c, it remains even when the holding elements 41, 42 have moved out of it , in its release position corresponding to the release of the pin 7. By means of a pivoting movement of the carrier 71 which is adapted in size to the number of receiving spaces 73 provided on the carrier 71, the bobbin case 11 carrying the empty bobbin 6 is moved out of the changing position and at the same time a bobbin case 11 carrying a filled bobbin 6 is brought into the changing position.

It was assumed above that when the bobbins 6 of all bobbin cases 11 are empty, the carrier 71 is exchanged for another carrier 71 equipped with bobbin cases 11 with bobbins 6 filled or outside the sewing machine again with bobbin cases 11 with filled bobbins . Of course, it is also possible to provide a second changing position for the carrier 71 with a gripping device 40, 60 according to the invention. Such a second change position could be arranged immediately after the prescribed change position, so that the bobbin case 11 with an empty bobbin can be replaced immediately after leaving the first change position, then in the second change position by a bobbin case 11 with filled bobbin 6.

A third embodiment of both the bobbin case and a gripping device adapted to it is shown in FIGS. poses.

In this further embodiment of the bobbin case too, the flap that has been customary since then has been eliminated. The locking slide of the first embodiment has also been omitted and replaced by a locking element which, in contrast to the locking slides of the two above-described embodiments, is arranged inside the bobbin case.

The bobbin case 101 shown in FIGS. 14 and 15 has a housing 102 for accommodating a conventional bobbin 6, which is open on its end face facing the usual lower capsule 4 and closed on its side facing away from the lower capsule 4 by a base 103. The outside of the bottom 103 forms the sliding surface for one of the legs of the needle thread loop in the usual way. The housing 102 of the bobbin case 101 has in the usual way a hollow pin 104, the inside diameter of which corresponds to the diameter of the pin 7 of the lower capsule 4. To secure the bobbin case 101 against rotation, the lower capsule 4 is provided in a known manner with two fixing pins 9 arranged at a distance from one another, which protrude into a recess 10 provided on the periphery of the bobbin case 4 and secure the bobbin case 101 in the radial direction. In order to lock the bobbin case 101 in its longitudinal direction, the lower capsule 4 has a pin 7, which is provided in the area of its free end in the usual way with an incision 8 which interacts with the blocking element 105 of the bobbin case 101.

The locking element 105 is ring-shaped and can be formed by an O-ring 106 or by a relatively easily deformable or expandable spring ring 107, which is received in an incision 108 in the hollow pin 104 and whose inner diameter is somewhat smaller than the diameter of the pin 7 . The diameter of the incision 108 is somewhat larger than the outer diameter of the elastic locking element 105 or the O-ring 106 or the spring ring 107. If the bobbin case 101 is pushed over the pin 7 of the lower capsule 4, the locking element 105 is first of all by the pin 7 spread and deformed elastically. As soon as the locking element 105 is in the area of the incision 8 of the pin 7 is located, the blocking element 105 deforms back into its original position and shape and engages in the incision 8 of the pin 7, so that the bobbin case 101 is secured in the axial direction.

As can be seen from FIGS. 14 and 15, a total of 4 stepped bores 109 are provided in the bottom 103, which are directed parallel to the longitudinal axis of the coil 6. The 4 stepped bores 109, the large diameter of which is located in the area of the inside of the bottom part 103, are arranged in the corner points of a rectangle or a square for reasons to be explained later. Provided in the housing 102 in the region of the bottom 103 are two slots 110 arranged diametrically opposite one another, into which 6 retaining springs of a gripping device engage when the coil is removed from the coil capsule 101. At the side of the hollow pin 104, a bore 111 is provided in the bottom 103, which, when the bobbin case 101 is removed from the lower capsule 4, serves to secure it against rotation.

To explain the structure and the mode of operation of the further embodiment of a gripping device, the gripping device 40 described first is used. The parts of the further embodiment of the gripping device 120 which are identical to the parts of the gripping device 40 described above are provided with the same reference numerals as in the gripping device 40.

A carrier 121 is fastened to the slide 43, which can be displaced along the guideway 44 (FIGS. 16a, 16b) and serves to receive a total of 4 retaining pins 122. The relative position of the holding pin 122 to one another and to the hollow pin 104 corresponds to the arrangement and relative position of the stepped bores 109 to one another and to the hollow pin 104. This ensures that when the slide 43 moves far enough in the direction of the gripper 3, all four holding pins 122 simultaneously can dip into the four stepped bores 109. The holding pins 122, which in their starting position are oriented essentially parallel to one another, can be pivoted on the carrier 121 about an axis 123, which can be arranged horizontally or vertically. In the embodiment shown, the because an axis 123 is pivotable, which can be arranged horizontally or vertically. In the exemplary embodiment shown, the axes 123 are arranged horizontally, so that the holding pins 122 can be pivoted in a vertical plane. In order to be able to pivot the holding pins 122 about the axes 123, a magnet 125 is assigned to each of the holding pins 122. The magnets 125 are arranged such that the two holding pins 122, which are adjacent to one another within a vertical plane, can be moved away from or towards one another.

Below the - with reference to FIGS. 16a, 16b - lower holding pin 122, a holding spring 124 is fastened to the carrier 121, the front end of which is bent. The arrangement of the retaining spring 124 on the carrier 121 is such that when the carriage 43 has moved sufficiently far toward the bobbin case 101 (with reference to FIGS. 16a, 16b), the retaining spring 124 in the lower of the slots 110 the bobbin case 101 engages and secures the bobbin case 101 both against rotation and also prevents the bobbin from falling out of the bobbin case 101.

The front ends of the holding pins 122 are each provided with a shoulder 126 (FIG. 17) which has an annular surface serving as a driver 127. The outer diameter of the driver 127 is slightly smaller than the diameter of the stepped bore 109 of the bobbin case 101, so that the projection 126 can be easily inserted into it. In order to facilitate the insertion of the extension 126 into the respective stepped bore 109, the front area thereof is slightly conical. At a distance from the driver 127, a cone serving as pressure element 128 is provided on the projection 126, the small diameter of which is slightly smaller than the small diameter of the stepped bores 109, so that the pressure element 128 can only be moved slightly into it.

FIG. 18 shows a design of the receiving locations 73 of the receiving device 70 that is adapted to the specific design of the bobbin case 101. Here, a mounting pin 130 is provided on the support arm 75, the arrangement of which corresponds to the arrangement of the mounting pins 76, 81 shown in FIGS. 9a and 9b. The receiving pin 130 therefore has a diameter which corresponds to the diameter of the pin 7 of the lower capsule 4. In the area of its end facing the support arm 75, the receiving pin 130 is provided with an incision 131, which in turn corresponds to the incision 8 on the pin 7 of the lower capsule 4. The bobbin case 101 is therefore received on the receiving pin 130 in the same way as on the pin 7 of the lower capsule 4. In order to secure the bobbin case 101 on the receiving pin 130 against rotation, there is a holding spring on the support arm 75 to the side or above the receiving pin 130 132 attached, the free end of which is slightly bent and, when the bobbin case 101 is pushed onto the receiving pin 130, engages in the upper slot 110 in the housing 102 of the bobbin case 101. The coil 6 is thus also secured against falling out of the bobbin case 101, or the bobbin case 101 against sliding off the receiving pin 130. In order to make it easier to push the bobbin case 101 onto the receiving pin 130, its free end is provided with a conical extension 133. Finally, a pin 134 directed parallel to the receiving pin 130 can be provided on the support arm 75 and engages in the bore 111 provided in the bottom 103 of the coil capsule 101 when the bobbin case 101 is pushed onto the receiving pin 130.

To explain the mode of operation of the third embodiment of the bobbin case 101 and the corresponding holding elements, reference is made to FIGS. 19a to 19d. It is assumed that the coil 6 located in the gripper 3 is worked empty, and the receiving pin 130 of the receiving device 70 provided on the support arm 75 is aligned with the axis of the gripper 3 and is free of a bobbin case 101. The gripping device 120 is in its rest position, relative to FIG. 19, to the left of the support arm 75.

To accommodate this coil, the carriage 43 is moved past the support arm 75 toward the gripper 3. Take the holding pin 122 their mutually parallel position and are moved by the carriage 43 so far into the stepped bores 109 that the annular surfaces of the drivers 127 are in the area of the enlarged part of the stepped bores 109 (FIG. 19b). The bottom 103 of the bobbin case 101 is now located between the respective driver 127 and the respective pressure element 128 of the holding pins 122. The holding spring 124 extends through the lower slot 110 of the housing 102 of the bobbin case 101 and secures the bobbin 6 during the later axial movement of the Bobbin case 101.

In this position, the holding pins 122 are spread apart by the magnets 125, so that the drivers 127 engage behind the base of the stepped bores 109 (FIG. 19c).

During the now return movement of the carriage 43, the elastic locking element 105 formed by an O-ring 106 or a spring ring 107 is pushed somewhat outwards by the backward movement of the holding pin 122 and thereby comes out of the incision 8 in the pin 7 of the lower capsule 4 Spool capsule 101 thus gripped by the holding pin 122 can be moved out of the lower capsule 4 and pushed onto the receiving pin 130 of the receiving device 70. The elastically deformed locking element 105 then snaps into the incision when it is opposite the incision 131 of the receiving pin 130

131, so that the bobbin case 101 is secured on the receiving pin 130 in the axial direction in the same way as on the pin 7 of the lower capsule 4. Since the pin provided on the support arm 75 engages in the bore 111 provided in the bottom 103 of the bobbin case 101, the bobbin case 101 is also secured in the radial direction. In addition, the retaining spring provided on the support arm 75 engages

132 through the upper slot 110 provided in the housing 102 into the bobbin case 101, so that on the one hand the bobbin case 101 is thereby also secured in the radial direction and on the other hand also the bobbin 6 is secured against falling out.

After the retaining pins 122 have returned to their parallel position are guided, the gripping device 120 is brought back into its rest position by its carriage 43, in which both the holding pins 122 and the holding spring 124 are located outside the bobbin case 101.

If a bobbin case 101 equipped with a filled bobbin 6 is to be moved by the gripping device 120 from the receiving pin 130 into the gripper 3 or its lower capsule 4, the slide 43 first moves the holding pins 122 in their parallel position in the direction of the gripper 3 to the drivers 127 are located within the receiving device 70 in the expanded area of the stepped bores 109 of the bobbin case 101 located on the receiving pin 130. The bottom 103 of the bobbin case 101 is thus again between the drivers 127 and the pressure pieces 128 of the holding pins 122. This situation corresponds to the situation according to FIG. 19c. Since the pressure pieces 128 of the holding pins 122 cannot penetrate into the stepped bores 109 of the bobbin case 101 during the further movement of the slide 43 starting from here, a spreading of the holding pins 122 per se would not be necessary. However, this is useful in so far as the drivers 127 do not assume a coaxial position with the stepped bores 109 of the bobbin case 101, and the bobbin case 101 cannot fall from the holding pin 122 during the movement of the carriage 43 to the gripper 3.

Claims

claims

1. Device for lockstitch sewing or embroidery machines for changing the bobbin case receiving the bobbin, which is received by a pin arranged inside the lower capsule of the gripper, with a receiving device which has a carrier with a plurality of adjacent receiving places for the bobbin cases and with one Gripping device for transferring the bobbin capsule π with a filled bobbin from the changing position of the receiving device to the gripper and for transferring the bobbin capsules with an empty bobbin from the gripper to the changing position of the receiving device, characterized in that the changing position of the receiving device (70) is immediately to the side and essentially coaxial with the gripper ( 3) is provided, and the gripping device (40, 60, 120) can be moved along a path essentially parallel to the axis (2) of the gripper (3) between the gripper and the changing position of the receiving device (70).

2. Device for lockstitch sewing or embroidery machines according to claim 1, characterized in that the receiving device (70) is pivotable about an axis (72) which runs parallel to the gripper (3) at a distance from it.

3. Device for lockstitch sewing or embroidery machines according to claim 1, characterized in that the receiving device (70) is pivotable about an axis which extends transversely to the axis (2) of the hook (3) and cuts it.

4. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the receiving device (70) is movable in the vertical and / or horizontal direction.

5. Device for lockstitch sewing or embroidery machines, the pin provided for securing the bobbin case in the lower capsule in the region of its free end has an incision interacting with a locking slide movably arranged on the bobbin case, according to one or more of the preceding claims, characterized in that that the gripping device (40) has two holding elements (41, 42) movable on a carriage (43) parallel to the axis of the gripper (3) for the bobbin case (31), of which the first holding element (41) is provided with a holding finger (45) which can be inserted in the movement direction of the gripping device (40) into a recess (23) provided on the bobbin case (31), and the second holding element (42) is provided with a holding lug (46) which engages on the locking slide (14) is also movable transversely to the longitudinal axis of the bobbin case (31).

6. Device for lockstitch sewing or embroidery machines according to claim 5, characterized in that the second holding element (42) on the first holding element (41) is pivotally mounted.

7. Device for lockstitch sewing or embroidery machines according to claim 5, characterized in that the recess (23) is provided on the bottom of the bobbin case (31).

8. Device for lockstitch sewing or embroidery machines according to claim 5, characterized in that the locking slide (14) adjacent to the recess (23) has an undercut (24), and the retaining lug (46) of the second retaining element (42) engages behind it .

9. Device for lockstitch sewing or embroidery machines, the pin provided for securing the bobbin case in the lower capsule in the region of its free end has an incision interacting with a locking element movably arranged on the bobbin case, according to one or more of the preceding claims, characterized in that that this Locking element is designed as a double leg spring (32) with two legs (33, 36) directed essentially parallel to one another, one leg (36) of which lies in the locking position of the locking element within the incision (8) of the pin (7) and through the gripping device (60) can be moved into its release position.

10. Device for lockstitch sewing or embroidery machines according to claim 9, characterized in that the free end of the other leg (33) of the double leg spring (32) is bent substantially at right angles and when the double leg spring (32 ) protrudes into the receiving space of the bobbin case (31) for the bobbin (6).

11. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the gripping device (60) has a spreading device (63) for the double leg spring (32) with two fingers (61, 62), which can be moved between the legs (33, 36) of the double leg spring (32) by a slide (65) movable parallel to the axis (2) of the gripper (3), the leg (36) additionally unlocking the coil capsule (31) is movable transversely to the path of movement of the carriage (65).

12. Device for lockstitch sewing or embroidery machines according to claim 11, characterized in that the gripping device (60) has a magnet (69) carried by the carriage (65), which cooperates with the end face of the bobbin case (31).

13. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the carrier (71) of the receiving device (70) is detachably connected to the latter.

14. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the carrier (71) of the receiving device can be positioned therein and can be locked by means of a snap lock.

15. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the gripping device (40, 60) from the gripper (3) facing away from the carrier (71) to the gripper (3) movable is.

16. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the carrier (71) has means for fixing the bobbin case (11, 31) in position on / on the carrier (71).

17. Device for lockstitch sewing or embroidery machines according to claim 16, characterized in that the means for fixing the bobbin case (11, 31) by two substantially vertically oriented and spaced pins (78) are formed in one Recess (25) of the bobbin case (11, 31) protrude.

18. Device for lockstitch sewing or embroidery machines according to claim 17, characterized in that the mutual distance of the pins (78) corresponds to the distance of the fixing pins (9) arranged in the lower capsule (4) for the bobbin case (11, 31) and the recess (25) cooperating in the bobbin case (11, 31) to fix it with the fixing pins (9) forms the recess.

19. Device for lockstitch sewing or embroidery machines according to claim 16, characterized in that the carrier (71) for fixing the bobbin capsules (11) has a plurality of webs (82) directed substantially parallel to its path of movement, each of the webs (82 ) is provided with a guide groove (83) for the locking element (14) of the bobbin case (11).

20. Device for lockstitch sewing or embroidery machines according to claim 16, characterized in that the carrier (71) for receiving the bobbin capsules has a plurality of sleeves (84) directed parallel to its path of movement and spaced apart, each with a with the locking element (14) of the bobbin case (11) cooperating guide groove (87) are provided.

21. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the carrier (71) for receiving the bobbin cases (11) has receiving pins (76), the diameter of which corresponds to the diameter of the pins (7) Lower capsule 4 corresponds.

22. Device for lockstitch sewing or embroidery machines according to one or more of the preceding claims, characterized in that the carrier (71) for receiving the bobbin capsules (11) has sleeves (84) whose inner diameter corresponds to the outer diameter of the bobbin capsules (11) .

23. Device for lockstitch sewing or embroidery machines, the pin provided for securing the bobbin case in the lower capsule in the region of its free end has an incision cooperating with a locking element provided on the bobbin case, according to one or more of the preceding claims, characterized in that the gripping device (120) has a plurality of holding elements (holding pins 122) for the bobbin case (101) which can be moved on a carriage (43) parallel to the axis (2) of the gripper (3) and which are provided in the bottom (103) of the bobbin case (101) and openings (109) oriented essentially parallel to the longitudinal axis thereof and movable for gripping the bobbin case (101) within the openings (109) transversely to the direction of movement of the gripping device (120).

24. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the openings (109) are designed as stepped bores, the large bore in the receiving space of the bobbin case (101) for the bobbin (6) flows.

25. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the holding pins (122) are each pivotable about an axis parallel or transverse to their longitudinal direction (123).

26. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the holding pin (122) is assigned at least one holding spring (124) for the bobbin (6), which is directed essentially parallel to these and, when the holding pins (122) are moved into the openings (109), they engage in a slot (110) provided in the housing (102) of the bobbin case (101).

27. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the retaining spring (124) and the retaining pin (122) are received by a common carrier (121) and this with the carriage (43rd ) connected is.

28. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that on the holding pin (122) adjacent to the drivers (127) pressure elements (128) are provided, which are designed as a cone, the Small diameter is equal to or smaller than the small diameter of the stepped bores (109) and its large diameter is larger than the small diameter of the stepped bores (109).

29. Device for lockstitch sewing or embroidery machines, according to claim 23, characterized in that the locking element (105) is formed by a ring (O-ring 106, spring ring 107) which is arranged within an incision (108) provided in the hollow journal of the coil capsule (101) and is elastically deformable in the radial direction.

30. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the elastic deformation of the locking element (105) can be effected by the axial movement of the bobbin case (101) which can be initiated by the holding pin (122).

31. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the support arms (75) for receiving the bobbin cases (101) each have a receiving pin (130) in the region of their free end the opposite end are provided with an incision (108) which corresponds to the incision (8) on the pin (7) of the lower capsule (4), the diameter of the receiving pin (130) corresponding to the diameter of the pin (7) of the lower capsule (4) .

32. Device for lockstitch sewing or embroidery machines, according to one or more of the preceding claims, characterized in that the receiving pegs (130) are each assigned at least one holding spring (132) which extends parallel to the latter and which on the receiving pegs (130) pushed-on bobbin case (101) engages in a slot (110) provided therein.