EP2369047A2 - Device with a gripper for changing a bobbin thread spool of a sewing machine - Google Patents

Abstract

The changing device (1) has an opening finger, which is linked to the bobbin case (3) in a spring-elastic manner for loosening a fixation on a middle pin. The gripper (2) has a lever (4) for lifting the opening finger of the bobbin case for clearing the fixation. The lever fixes the bobbin case by clamping against a chute in the gripper. A pin tap (6) is provided at the gripper for engaging in a recess (7) of the bobbin case.

Description

The present invention relates to a device for changing a bobbin on a sewing or embroidery machine with a gripper, wherein the sewing or embroidery machine has a bobbin receiving the bobbin, which has a resiliently hinged to the bobbin opening fingers for releasing a fixation on a center pin.

It is known from modern thread processing machines of the aforementioned type that their bobbins due to their limited thread capacity depending on the application at intervals of only a few minutes must be changed. Therefore, various approaches are known from the prior art to provide devices for changing bobbins.

So is among others from the W02005 / 108666 A1 known that sewing machines usually have a gripper with a needle thread loop gripper tip, as well as with a mounted in the gripper bobbin case or bobbin case with a bobbin of this recorded. The bobbin case is provided with a coaxial to the axis of the gripper center pin which engages in inserted into the bobbin thread bobbin in a arranged in this hollow cylinder, which in turn carries the the hook thread supply receiving coil.

To secure the bobbin case on the center spigot of the bobbin this is provided in the region of its protruding from the coil end with a radially encircling incision, engages in the inserted into the bobbin bobbin on this provided spring-loaded locking bolt. The locking bolt is displaceably mounted on the bobbin case against the force of a spring and has for the passage of the center pin on an opening which is larger by a certain amount than the diameter of the center pin. Thus, the locking bolt secures in its one end position, the bobbin against falling out of the bobbin case and can be spent against the force of the spring in his the bobbin case freely giving other end position by means of a pivotally mounted on the bobbin case and with the locking bar associated bobbin case in which the Bobbin can be removed from the bobbin case or from the gripper. In order to prevent falling out of the bobbin from the bobbin case in this position of the locking bar and thus in particular both during insertion and during removal of the bobbin case, a bent nose is provided on the locking bar, which is provided by a provided in the wall of the bobbin case in the recess Interior protrudes and the bobbin ensures against falling out of the bobbin case.

To facilitate the operation of the bobbin case flap, a free end of the bobbin case flap is slightly bent away from the bobbin case. The free end of the bobbin case flap can be easily engaged behind to remove the bobbin from the bobbin case and also for introducing a new bobbin wound bobbin in the bobbin case by the operator without tools only by hand. A changer according to the WO 2005/108666 A1 comprises an actuating means for opening the bobbin case flap is formed by a movable between the latter and the end face of the bobbin case opening fingers. In addition, the known gripping device has two engaging on the longitudinal boundary surfaces of the open bobbin case clamping jaws, which are movable together with the opening finger along a direction parallel to the axis of the gripper web by an amount corresponding to at least the immersion depth of the bobbin case into the gripper. Thus, in a first step, a fixation of the bobbin case is released, in order then to be gripped in a second step for the actual changing operation by two movable jaws. By a displacement of the gripping device parallel to the axis of rotation of the bobbin, the bobbin case is withdrawn with the lower bobbin held therein from the center pin and moved to a storage position. Subsequently, another bobbin case is loaded with the held therein new, full bobbin in the gripping device, moved into position and positioned reversing the process outlined above safely positioned on the center pin of the sewing machine and subsequently fixed automatically by the spring-loaded locking bolt.

From the US 6,286,444 B1 is a changing device with a less movable parts having gripper known. However, this device is inaccurate in the positioning of an open in the gripper held bobbin case.

The EP 0 829 565 A1 discloses a changing device of the aforementioned type, in which a bobbin case is fixed in a form-fitting manner in a gripper via a recess in the bobbin case flap. Again, there are problems in the most accurate positioning of the bobbin case in particular when inserting a bobbin case with a full bobbin in a sewing machine.

It is the object of the present invention to develop a known device with simplification while further increasing the operational reliability of the device in the sense of improved positioning accuracy.

This object is achieved in that the bobbin case of the bobbin case to lift the fixation lifted by a lever and fixed by the same lever by clamping against a ramp in the gripper positionally under adhesion, at the gripper at least one for engaging in a recess of the bobbin case trained mandrel is provided. Thus, in contrast to the prior art on the gripper itself only a movable part is present, which causes a fixation of the bobbin case on a ramp in the gripper. The ramp forms a rigid component, so that positional deviations of the bobbin case in the gripper remain within a definable narrow tolerance range, since the bobbin case is now no longer in contact with elastically highly deformable elements. The mandrel causes after intervention in an associated recess of the bobbin case an increase in the positioning accuracy and positional fixation and a safeguard against tilting of the recorded on the gripper bobbin case, and even before the opening of the locking of the bobbin on the center pin.

Advantageous developments are the subject of the dependent claims. Accordingly, the lever is designed as a rocker arm. The rocker arm moves with a rotation axis perpendicular to the axis of the center pin, which forms an axis of rotation of the bobbin. Thus, the rocker arm moves in the plane in which the center pin lies, on which the bobbin case is secured and around which the bobbin turns. Thus, the gripper takes up even when a replacement operation in front of the head of a sewing machine only relatively little space.

In one embodiment of the invention, more than one mandrel is provided on the gripper. For ease of insertion of the mandrel is preferably tapered conically at a free end. Preferably, as a third contact point of the bobbin case on the gripper an adjustable in length on the gripper stop is provided, which lies in the plane of the at least one mandrel, but in use in particular with a lower portion of the bobbin case to form a mechanically precisely determined three-point contact in contact or comes into contact.

Preferably, the bobbin case has at least one bore or cut-out in a radial region of its end face. In this recess engages a spike of the gripper at the beginning of a change process. This advantageously prevents tilting or rotation of the bobbin case outside a tolerable deviation.

Particularly advantageously, bobbin cases containing full bobbins are removed by the gripper from a chain conveyor on which the bobbin capsules are automatically fixed in the manner in which they are also in use on a sewing machine. Compared to the turret magazines used in the prior art for known Unterfadenspulenwechsel the chain conveyor has the advantage that it can be refilled by hand during the ongoing production of a running sewing process, ie, or without interruption. Due to a plurality of removal positions, which are not only the front side in the region of deflections, is a positioning and alignment of a chain conveyor of a sub-coil changing device according to the invention adaptable in a wide range to respective conditions in the room and a required accessibility for operators. In addition, a chain conveyor is flexible in terms of its storage capacity adaptable to respective needs, that its chain is extended.

On the chain conveyor for this purpose in a preferred embodiment of the invention at intervals support members are provided on which recordings in the form of plates with a end with a groove, in particular a radially encircling or a radial groove, provided center pin and a positioning tab are attached. The positioning tab has at its free end portion a guide into which engages an element of a bobbin case when inserting to ensure proper alignment. For easy adaptation to a correct axial alignment for each application, these positioning tabs are rotatable by an angle and preferably securely fixed by screwing.

In one embodiment of the invention, the chain conveyor is driven via a cylinder under the control of a detector which detects a receptacle occupied by a full bobbin case. The cylinder moves the chain conveyor per stroke by a distance corresponding to the distance between two shots. The cylinder is controlled until the detector reports a recording with a bobbin case. Preferably, detents on the receptacles of the chain conveyor per stroke of the cylinder ensure positioning of a respective receptacle with a bobbin case with full bobbin such that this bobbin case is in direct access to the change.

The replacement process itself according to a preferred embodiment of the invention is such that a blank or a To bobbin thread or even torn bobbin thread-bearing bobbin is reported by appropriate means on the sewing machine. Then, at the sewing stop, the empty gripper is moved in the y-direction into a rotation axis of the bobbin and in the x-direction onto the bobbin case. In this case, the gripper opens the fixation of the bobbin case on a center pin of the sewing machine and the gripper removes the bobbin case with the valved bobbin as depleted by driving back in the x direction. On a subsequent y-way piece of the gripper releases its fixation of the bobbin case, ie the gripper unloads the emptied unit from bobbin case and held therein bobbin at a collection point. Preferably, for this purpose, a funnel with attached downpipe is provided, which transfers a discharged bobbin case directly into a collecting container. Then the gripper ends its travel in the y-direction, where it is now in the axis of the center pin on which a bobbin case is fixed with new or full lower bobbin. Analogous to the unloading process on the sewing machine described above, the gripper is now moved in the x direction on the bobbin case of the chain conveyor and opens the fixation of the arranged on the center pin of the receptacle bobbin case. After moving the gripper back in the y-direction, the gripper is again moved in the x-direction into an axis of rotation of the lower thread spool on the sewing machine. By re-moving in the y-direction, the gripper sets the full bobbin with bobbin case on the center pin of the sewing machine, where the bobbin case automatically locks after loosening the fixation on the gripper. Thus, the change is completed, which occupies approximately the shape of a C or U in space using only two drive units, and the sewing machine can be returned to normal operation.

In the embodiment of the invention described above, a picking position of the chain conveyor and an inserting position of the associated sewing machine are arranged over each other; when arranged side by side, instead of moving in y- in the z-direction, so that in principle only one movement in a plane is required. An extension around the third dimension may, in special circumstances, e.g. Lack of space, be required and is my invention of a device with an additional drive also feasible.

Figur 1:

eine Darstellung einer Ausführungsform eines Greifers einer Wechselvorrichtung in perspektivischer Ansicht;

Figuren 2a - 2c:

Ansichten der Ausführungsform von Figur 1;

Figuren 3a und 3b:

Schnittdarstellungen eines Teilschritts zum Laden einer Spulenkapsel;

Figur 4:

eine dreidimensionale Darstellung der in Richtung einer x-Achse ablaufenden Bewegungen im Zug von Positionierung und Laden der Spulenkapsel;

Figuren 5a - 5d:

drei Ansichten und eine dreidimensionale Darstellung einer Ausführungsform einer erfindungsgemäß erweiterten Standard-Spulenkapsel;

Figur 6:

eine dreidimensionale Darstellung eines Kettenförderers mit Aufnahmen und zwei gemäß vorliegender Ausführungsform möglichen Entnahmepositionen;

Figuren 7a und 7b:

zwei Ansichten der Ausführungsform eines Kettenförderers gemäß Figur 6 und

Figuren 8a bis 8c:

drei perspektivisch dargestellte Teilschritte beim Wechsel einer Spulenkapsel mit dem Laden der Spulenkapsel von einer Aufnahme des Kettenförderers bis zum Start des Verfahrens des Greifers zu einer Aufnahme an einer Nähmaschine.

Hereinafter, an embodiment of the invention, illustrating further features and the resulting advantages with reference to the figures of the drawing will be explained in more detail. In the drawing, in sketched representation:

FIG. 1:

a representation of an embodiment of a gripper of a changing device in a perspective view;

FIGS. 2a-2c:

Views of the embodiment of FIG. 1 ;

FIGS. 3a and 3b:

Sectional views of a sub-step for loading a bobbin case;

FIG. 4:

a three-dimensional representation of the running in the direction of an x-axis movements in the train of positioning and loading the bobbin case;

FIGS. 5a-5d:

three views and a three-dimensional representation of an embodiment of an inventively extended standard bobbin case;

FIG. 6:

a three-dimensional representation of a chain conveyor with recordings and two possible according to the present embodiment removal positions;

FIGS. 7a and 7b:

two views of the embodiment of a chain conveyor according to FIG. 6 and

FIGS. 8a to 8c:

three partial steps shown in perspective when changing a bobbin case with the loading of the bobbin case of a recording of the chain conveyor to the start of the process of the gripper to a recording on a sewing machine.

Uniformly, the same designations and reference numbers are used across the figures for the same components, elements, method steps or assemblies.

The picture of FIG. 1 shows a representation of a section of a changing device 1, an embodiment of a gripper 2 with an open, fixed bobbin case 3 fixed therein in a perspective view. For clarity, a secured in the bobbin case 3 against falling out and rotatable about an axis a bobbin itself in FIG. 1 and subsequently not shown.

In addition, it is also shown graphically that the bobbin case 3 is secured against tilting by a lever 4 in the open position. This lever 4 is driven by a pneumatic cylinder 5 and is rotatable about an axis b. The axis b is in a plane which is perpendicular to the axis a of the rotatably mounted bobbin. Here, the axes a, b are each perpendicular to each other as parallel to an x- and y-axis with a small offset.

As additional protection against tilting of the bobbin case 3 in the gripper 2 are in FIG. 1 two point-symmetrically arranged mandrels 6 indicated. These mandrels 6 engage in the process of the gripper 2 via the bobbin case 3 in corresponding recesses 7 on the bobbin case 3 a. One below in the picture of the Figure 2c with a marked distance c illustrates the size of a against tilting of the bobbin case 3 on the gripper 2 additionally acting lever, by the mechanical load in the view of FIG. 1 invisible articulation of a subsequently described bobbin case flap on the bobbin case 3 is substantially reduced. As a third contact point adjustable in length stop 6a is indicated. The stop 6a is located in the plane of the two mandrels 6, but is in use in particular with a lower portion of the bobbin case 3 in contact. Thus, a secured against tilting and twisting three-point installation of the bobbin case 3 is formed on the gripper 2.

The pictures of the FIGS. 2a-2c show views of the embodiment of FIG. 1 to illustrate the structure of the gripper 2 with the arrangement of two drives, a pneumatic cylinder 5 and an electric motor 8. In these figures, a bobbin case 3 is always kept secured against tilting by a lever 4 in the open position, wherein by actuation of a bobbin case. 9 a locking bar 10 for Releasing an automatic fixation of the bobbin case 3 has been effected. The bobbin case flap 9 is pressed against a ramp 11, so that the entire bobbin case 3 is fixed non-positively in the gripper 2

In a known manner, this locking bolt 10 is formed so cranked that it causes a locking on a center portion of the spool 3 shown below along the axis a at an outer region of the bobbin case. On the other hand, the locking bolt 10 but also engages in the FIG. 1 in the manner indicated manner in the bobbin case 3 inwardly such that a bobbin arranged in the bobbin case 3 and not shown here and further below bobbin can not fall out of the bobbin case 3 in the open state.

The FIGS. 3a and 3b show in sectional views of a sub-step for loading a bobbin case 3 in a gripper 2. Through the sectional views of the inner structure of the gripper 2 with the sequence of substeps is now clear. In the position of FIG. 3a the gripper 2 has been moved on a rail guide by the motor 8 over a distance Δx to the bobbin case 3. In the last section, two mandrels 6 engage in the recesses 7 of the bobbin case 3 and cause additional positioning security. Now, the cylinder 5 is actuated, whereby the rocker arm 4 is pivoted about the axis b. A free nose of the rocker arm 4 folds in the course of this pivotal movement the bobbin case 9 of the bobbin case 3 and presses flat against the ramp 11 in the gripper 2 for non-positive fixing or clamping of the bobbin case 9, as in FIG. 3b is shown. In this case, at the same time a fixation of the bobbin case 3 is released by the locking bar 10 on a dashed lines center pin 12. Thus, the bobbin case 3 can be securely fixed in the gripper 2 and in a subsequent step by opposite Moving the gripper 2 in the x direction are deducted from the center pin 12. After reaching a distance Δx, the gripper is again in a starting position. In the case of a bobbin taken from a sewing machine in the bobbin case 3 and previously disturbed as empty or by thread break bobbin the bobbin case 3 is dropped in the starting position by opening the fixation by operating the lever 4 into a collection container.

FIG. 4 is a perspective view of the running in the direction of an x-axis movements of the gripper 2 in the train of positioning and loading and subsequent removal of the bobbin case 3. In a cross-fade herein are the two above with reference to the FIGS. 3a and 3b described positions with movements of the lever 4 about the axis b or b 'indicated. Indicated in FIG. 4 Also, the movement of the locking bolt 10, which causes in the course of solving the fixation on the center pin 12 by engaging in the bobbin case 3 in a position assurance of the lower bobbin not shown here against falling out of the bobbin case 3.

FIGS. 5a-5d show three views and a three-dimensional representation of an embodiment of an inventively extended or modified standard bobbin case. In the bobbin case 3 shown here is a only slightly adapted standard part, in which, inter alia, the end has been shortened to facilitate a manual operation bobbin case 9 in a range K at a free end to adapt to a movement space of the lever 4 has been shortened. At the area K remains only a manually operable chamfer on the bobbin case flap 9, which also facilitates opening through the lever 4 and further allows opening by hand. When opening the bobbin case 9 the locking bar 10 along the in FIG. 4d plotted double arrow to solve the fixation on the center pin 12 and simultaneously securing the position of the not visible bobbin moved. Furthermore, two recesses 7 are additionally provided in as bores in an outer region of the bobbin case 3, in which a respective mandrel 6 engages at the beginning of a charging process before unlocking the bobbin case 3, see also FIG. 1 ,

The gripper 2 is designed to remove a bobbin case 3, which contains a thread fully wound or full bobbin, from a supply and conveyor. FIG. 6 shows in a three-dimensional representation of a supply and conveying device in the form of a chain conveyor 13 with recordings and two possible according to the present embodiment removal positions P, P2. In a chain 14 of the chain conveyor 13 carrying members 15 are provided at intervals d, on which receptacles 16 are fixed in the form of plates 17. A plate 17 carries at its center with an end provided with a radial groove center pin 12 and a positioning tab 18. The positioning tab 18 has at its free end portion 19, a guide 20, in which an element of a bobbin case 3 at its insertion to ensure proper alignment leader intervenes.

A chain conveyor 13 of the type described above must be adapted to a respective application or a respective arrangement of the chain conveyor 13 relative to the gripper 2 of the changing device 1. This ensures that the coil capsules 3 removed from the chain conveyor 13 are correctly unlocked by the gripper 3 and can subsequently also be positioned and locked in the correct position on a center pin 12 of a sewing machine. For easy adjustment and thus the correct orientation of the bobbins 3 are the recordings 16 in a simple manner customizable. For this purpose, the positioning tabs 18 to adapt to different application scenarios via prefabricated in the plate 14 holes 21 in four basic directions on the plate 14 can be fixed via a screw. In the dashed circle is in FIG. 6 In addition, the possibility indicated, a fixation in deviations by an angle α is provided by a respective basic direction.

A removal position P2 could be used as an alternative not shown here in the case that the chain conveyor 13 is arranged vertically aligned relative to the present embodiment in the present embodiment. In principle, however, all recordings 16 are to be set up as removal positions. In addition, a chain conveyor 13 can be adapted to change its storage capacity in its length and / or spatial shape, as is known in the art. This can be done in a simple manner, a position or area for equipping the chain conveyor 13 with new or each a full lower bobbin containing bobbin cases 3 at a readily accessible to operators and also during operation of the system without risk.

The FIGS. 7a and 7b show two views of the embodiment of a chain conveyor 13 according to FIG. 6 , where in FIG. 7b the drive of the chain conveyor 13 is particularly clearly recognizable: it comprises a cylinder 22, via the piston rod 23, a carriage 24 is moved on a rail 25. The carriage 24 carries a spring-loaded rocker arm 26, which in the course of a withdrawal of the cylinder 22 at intervals d with a free nose 27 grasps behind a portion of a respective support member 15 and locked here. In a subsequent control of the cylinder 22 of the carriage 24 and thus the carrier member 15 latched thereto is a to the cylinder 22 and its piston rod 23 adjustable and the stroke corresponding distance moved. About the chain 14 all other recordings 16 are moved. With comparatively simple means, a high positioning accuracy with good adaptability of the system is thus achieved with indirect drive of the chain conveyor 13.

The chain conveyor 13 serves not only the function of a precisely working supplier new or with full bobbins stocked bobbins 3, he also has the task of a memory. Between two end provided on the chain conveyor 13 deflecting wheels a profile is provided, so that by extension of this longitudinal axis a capacity of the described chain conveyor 13 is to be increased in a simple manner. As an alternative or in addition to this, the distances d between adjacent receptacles 16 can also be reduced in comparison with the present embodiment, which adjoin the receptacles virtually to each other in abutment. In today regularly occurring application-dependent change times of up to 4 min. Thus, it can be very interesting for a largely uninterrupted operation of a sewing machine to expand the storage capacity of the above-described chain conveyor 13 to newly fitted bobbin cases 3 to a continuous operation of more than one hour, without having to be reloaded by operators on the sewing machine or on the chain conveyor 13 , Since a rectilinear design and slim design is only one design feature of the present embodiment, thus adapting to an available space in front of a sewing machine and three-dimensionally extending shapes for a course of the chain 14 can be selected.

Finally, the FIGS. 8a to 8c perspective three sub-steps when changing a bobbin case 3 with the store a bobbin case 3 enclosing a newly wound bobbin from a receptacle 16 of the chain conveyor 13 to the start of the positioning of the gripper 3 relative to a center pin 12 of a receptacle on a sewing machine. Here, the sewing machine is shown sketched only on the hint of a sewing table to the Location of the sewing machine in the same horizontal plane next to the chain conveyor 13 to illustrate. Alternatively, in FIG. 8c also sketched an arrangement of the chain conveyor 13 below a sewing machine on the basis of a required travel path. In both cases, while retaining the in FIG. 6 sketched removal position P but only a method of the gripper 3 in a plane required.

In the foregoing, a device 1 for changing a bobbin in a bobbin case 3 on a sewing or embroidery machine with a gripper 2 has been presented on the basis of embodiments, in which the gripper 2 consists of a few components and only slightly adapted standard parts securely grips and positions , Even adjustments to a standard sewing head are required only to a very limited extent.

With such a device 1, a continuous manufacturing process of a sewing machine is possible because the described chain conveyor 13 can be recharged at any time without replacement of parts by hand by an operator. The manufacturing process continues undisturbed during reloading. A storage volume of the described chain conveyor 13 can be adapted within wide ranges, so that an automatic sewing machine equipped according to the invention can also be operated uninterrupted for several hours without the intervention of operators.

The small additional footprint of the device described just in the field of sewing head makes a simultaneous application of residual thread or color thread guards possible and recommended. The change times for a bobbin case 3 when detecting only a residual thread or even in the case of thread breakage are very short. This is in the case of disturbances in the area of the lower thread a much longer operating time without time-consuming intervention by operators possible. As part of a retrofit, a significant increase in efficiency of existing Nahmaschinen-systems is possible.

LIST OF REFERENCE NUMBERS

1

changing device

2

grab

3

bobbin case

4

lever

5

pneumatic cylinder

6

mandrel

6a

Stop, adjustable

7

Recess in bobbin case 3 for mandrel 6

8th

electric motor

9

Bobbin case flap

10

safety catch

11

Ramp in gripper 2 for clamping bobbin case flap 9

12

center pin

13

chain conveyors

14

Chain

15

carrying member

16

admission

17

plate

18

positioning tab

19

free end area

20

U-shaped guide

21

drilling

22

cylinder

23

piston rod

24

dare

25

rail

26

spring-loaded rocker arm

27

free nose of rocker arm 26

a

Rotary axis of the bobbin

b

Rotary axis of the lever 4

b '

shifted axis of rotation of the lever 4

c

Distance / mechanical lever on the bobbin case 3

d

Distance from support members 15 on the chain 14th

K

shortened area of the bobbin case 9

P

removal position

P2

an alternative removal position

α

from a basic direction deviating angle

Claims (14)

Device with a gripper (2) for changing a bobbin on a sewing or embroidery machine, wherein the sewing or embroidery machine has a bobbin receiving the lower bobbin (3), which with a resiliently hinged to the bobbin case (3) opening fingers (9) for Release of a fixation on a center pin (12) is provided, wherein the gripper has a lever (4) for lifting the opening finger (9) of the bobbin case (3) for canceling the fixation and the same lever (4) the bobbin case (3) by clamping fixed against a ramp (11) in the gripper (2),
characterized,
in that at least one mandrel (6) designed to engage in a recess (7) of the bobbin case (3) is provided on the gripper (2). Device according to claim 1, characterized in that
in that the lever (4) is designed as a rocker arm which moves with a rotation axis (b) perpendicular to the axis (a) of the middle journal (12) in the plane in which the center journal (12) lies. Device according to one of the preceding claims, characterized in that at least one adjustable stop (6a) is provided on the gripper (2). Device according to one of the preceding claims, characterized in that the gripper (2) for removing a bobbin case containing a full bobbin (3) is formed by a supply and conveying device. Device according to the preceding claim, characterized in that the supply and conveying device is designed as a chain conveyor (13). Device according to the preceding claim, characterized in that the chain conveyor (13) on a chain (14) at a distance (d) supporting members (15), on each of which a receptacle (16) for a bobbin case (3) is mounted. Device according to the preceding claim, characterized in that the receptacle as a plate (17) is formed, which has a central end provided with a groove center pin (12) and a positioning tab (18). Device according to the preceding claim, characterized in that the positioning tab (18) of the receptacle (16) at a free end region (19) has a guide (20) which upon insertion of a bobbin case (3) for receiving an element of the bobbin case (3 ) is designed to ensure correct alignment of the bobbin case (3). Device according to one of the two preceding claims, characterized in that the positioning tab (18) to adapt to different application scenarios on prefabricated holes (21) in four basic directions on the plate (17) is fixable and preferably in deviations by an angle ( α) from a respective basic direction. Device according to one of the three preceding claims, characterized in that the chain conveyor (13) has a Cylinder (22), via the piston rod (23) on a rail (25) movable carriage (24) is connected, which carries a spring-loaded rocker arm (26) whose free nose (27) for latching to a part of a respective support member (15) is formed. Device according to the preceding claim, characterized in that the rocker arm (26) for positioning by the piston rod (23) behind the support member (15) engages on the receptacle (16) of the gripper (2) next to be removed bobbin case ( 3) is fixed. Device according to one of the seven preceding claims, characterized in that the chain conveyor (13) comprises a detector for controlling the cylinder (22), wherein the detector for detecting a recording (16) of the chain conveyor (13) occupied by a full bobbin case (2) ) is trained. Device according to one of the preceding claims, characterized in that the gripper (2) between a removal position (P, P2) and a place of use of a bobbin case (2) on a sewing machine in a plane approximately C-shaped in space is movable. Device according to one of the preceding claims, characterized in that at a collection point a funnel with attached downpipe is provided, in which the gripper (3) discharges the emptied unit from bobbin case (2) and held therein bobbin.

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