DEVICE FOR CUTTING TO LENGTH CONDUCTOR PIECES RECEIVED IN A STATOR CORE

Abstract

The invention relates to a device for cutting to length conductor pieces, in particular hairpins, received in a stator core, including a receptacle for the stator core together with the conductor pieces received therein, the free ends of which protrude out of the stator core when in the received state, in particular in the direction of gravity, and a cutting unit which comprises cutting portions that are designed and arranged such that they can be moved toward one another in order to act in a cutting manner from two opposing sides on at least one conductor piece to be cut to length, and the longitudinal axis thereof, during a cutting process.

Claims

1. Device for trimming conductor pieces inserted in a stator core, comprising: a. a seat for the stator core with the conductor pieces inserted therein, the free ends of which protrude from the stator core in the inserted condition, b. and at least one trimming unit which comprises at least two blade sections which are configured and arranged in such a way that they can be moved towards one another to act in a cutting manner during a cutting process from two opposite sides upon at least one conductor piece to be trimmed and its longitudinal axis characterized in that the trimming unit comprises two cutting arms which are connected to one another pivotably supported at a common blade pivot point, wherein the blade arms each have on a first side one of the blade sections and on a second side opposite to the blade section an extension arm as well as a positioning arm, by means of which the blade sections can be brought in an operating position, wherein the blade pivot point has a fixed position with respect to the positioning arm.

2. (canceled)

3. (canceled)

4. Device according to claim 1, characterized in that the trimming unit further comprises: two operating arms which are arranged each supported pivotably around a common operating arm pivot point and connected to one another at a linkage point which is situated in the area of a respective first end of the respective operating arm, and which are operatively connected with their respective second end to an actuating unit, wherein the actuating unit is configured to move the second ends of the operating arms relative to one another and thus to pivot the operating arms around the operating arm pivot point against each other, wherein each blade arm is linked pivotably supported to a respective operating arm at a linkage point, and the linkage point is guided in the positioning arm with a translational degree of freedom.

5. Device according to claim 4, characterized in that the actuating unit is in the form of a pressure, hydraulic or pneumatic cylinder.

6. Device according to claim 4, characterized in that the translational degree of freedom of the linkage point allows a sliding of the linkage point with respect to the positioning arm along a straight line extending through the linkage point and the blade pivot point, wherein a pivot axis of the linkage point is guided in an oblong hole of the positioning arm.

7. Device according to claim 4, characterized in that the linkage point where a respective blade arm is linked pivotably supported to the respective operating arm, is each arranged along the extension of the respective operating arm between the linkage point and a point of operative connection with the actuating unit.

8. Device according to claim 1, characterized in that the stator core is rotatable in the seat with respect to the trimming unit along the circumferential direction, and/or the trimming unit is movable along the circumferential direction and/or radial direction.

9. Device according to claim 3, characterized in that the blade arms each comprise a mounting section extending to the blade pivot point where they are linked to the blade pivot point, wherein the blade section and the extension arm of the same blade arm are arranged on the same side with respect to the straight line extending through the linkage point and the blade pivot point, when the trimming unit is in its open state, and/or wherein the blade section and the extension arm of the same blade arm are arranged on the same side with respect to the straight line which extending through the linkage point and the blade pivot point, when the trimming unit is in its closed state.

10. Device according to claim 4, characterized in that the trimming unit is beveled in the region of the blade sections in particular—in the region of a straight line extending through the linkage point and the blade pivot point and in particular everywhere in the direction of gravity, so that there are no flat surfaces extending orthogonal in relation to gravity on which bits of conductor pieces could remain.

11. Device according to claim 4, characterized in that the trimming unit is configured in such a way that a straight connecting line which connects the ends of the blade sections facing one another has a distance to a straight line extending through the linkage point and parallel to the straight connecting line, wherein the distance between the straight connecting line and the straight line through the linkage point is greater in the closed state of the trimming unit than in the is open state of the trimming unit.

12. Device according to claim 4, characterized in that the positioning arm, the actuating unit, the blade arms and/or the operating arms are arranged essentially in one plane.

13. Device as claimed in claim 1, characterized in that the conductor pieces are arranged in rows, which extend each in a radial direction, on several circuits extending in a circumferential direction, and protrude from the stator core along a longitudinal direction corresponding particularly to the direction of gravity, wherein at least one trimming unit is configured and arranged in such a way that the movement of the blade sections during a cutting operation is performed along the radial direction and/or at least one trimming unit (16) is configured and arranged in such a way that the movement of the blade portions (18) is performed along a direction orthogonal to the radial direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further features, details and advantages of the invention can be found in the wording of the claims and in the following description of the embodiment with reference to the drawings, in which:

[0031] FIG. 1 is a side view of a cutting unit in the open state;

[0032] FIG. 2 is a perspective view of the cutting unit according to FIG. 1;

[0033] FIG. 3 is a side view of the cutting unit in the closed state;

[0034] FIG. 4 is a perspective view of the cutting unit according to FIG. 3;

[0035] FIG. 5 is a top view of the cutting unit according to FIG. 3 and

[0036] FIG. 6 is a perspective view of an arrangement of a plurality of cutting units.

DETAILED DESCRIPTION

[0037] In the following description and in the figures, corresponding components and elements have the same reference signs. For the sake of clarity, not all of the reference signs are shown in all of the figures.

[0038] The device 10 for cutting to length conductor pieces 14 received in a stator core 12 has a receptacle for the stator core 12 and at least one cutting unit 16.

[0039] A side view of the cutting unit 16 in the open state is shown in FIG. 1. FIG. 2 shows a perspective view of the cutting unit 16 according to FIG. 1.

[0040] The cutting unit 16 has two cutting portions 18. These can be moved toward and away from one another to carry out a cutting process. One conductor piece 14 or a plurality of conductor pieces 14 can be cut to a desired length via a cutting process by cutting off a part of the conductor piece 14.

[0041] The conductor pieces 14 to be cut to length are arranged in rows, each of which extends in a radial direction 22, along circular paths running in a circumferential direction 20. The free ends of the conductor pieces 14 which are to be cut to length protrude from the stator core 12 along a longitudinal direction 24 (see FIG. 6).

[0042] The cutting unit 16 also includes two cutting arms 26. These are each mounted pivotably via an attachment portion 44 in a common cutting pivot point 28 and are connected to one another. Each cutting arm 26 has the cutting portion 18 on its first side and an extension arm 30 on its second side, opposite the first side.

[0043] The cutting unit 16 has a positioning arm 32. With the positioning arm 32, the cutting unit 16 and in particular the cutting portions 18 can be moved into a working position in which a cutting process can be carried out.

[0044] The cutting arms 26 are pivoted about the cutting pivot point 28 by means of two actuating arms 34.

[0045] The two actuating arms 34 are each connected to one another at a first end in a pivot point 36 and are pivotably mounted about this point. The pivot point 36 thus represents the actuating arm pivot point of the two actuating arms 34. The pivot point 36 or its pivot axis is guided within an elongated hole 42 which is arranged in the positioning arm 32.

[0046] The two actuating arms 34 are each operatively connected to an actuating unit 38 at a second end. In this embodiment, the actuating unit 38 is designed in the form of a pneumatic cylinder. It can also be provided that the actuating unit 38 is operatively connected directly to the cutting arms 26 without the interposition of the actuating arms 34 which, however, form a lever transmission for the actuating unit 38. In this case, it is provided in particular that the extension arms 30 are virtually crossed over the cutting pivot point 28, so that the actuating unit 38, which is designed as a hydraulic cylinder, moves the cutting portions 18 toward one another by means of an extension movement.

[0047] In general, it is provided according to the invention that an actuating unit 38, which is designed as a hydraulic or pneumatic cylinder, moves the cutting portions 18 toward one another by means of an extension movement (lengthening of the actuating unit or extension of a piston from a cylinder) and moves them away from each other by means of a retraction movement (shortening of the actuating unit or retraction of a piston into a cylinder).

[0048] The cutting arms 26 are each connected to the actuating arms 34 at a connection point 40 and are pivotably mounted about this connection point 40.

[0049] To carry out a cutting process, the cutting unit 16 is transferred from the open state shown in FIG. 1 and FIG. 2 to a closed state. In FIGS. 3 to 5, the cutting unit 16 is shown in a closed state, wherein FIG. 3 shows a side view, FIG. 4 a perspective view and FIG. 5 a top view of the cutting unit 16.

[0050] The cutting process is carried out by the actuating unit 38 moving the two second ends of the actuating arms 34 apart in a relative movement when the cutting unit 16 is in the open state. During this relative movement of the actuating arms 34, the pivot point 36 moves within the elongated hole 42 from a first end of the elongated hole 42, in which the pivot point 36 is located when the cutting unit 16 is in the open state (see FIG. 1), to a second end of the elongated hole 42, in which the pivot point 36 is located when the cutting unit 16 is in the closed state (see FIG. 3). The pivot point 36 moves effectively within the elongated hole 42 in FIG. 1 from top to bottom.

[0051] The relative movement of the actuating arms 34 forces the two connection points 40 apart. The pivoting process of the cutting arms 26 is thus initiated. In the process, the cutting arms 26 move about the cutting pivot point 28, so that the cutting portions 18 move toward one another until the closed state of the cutting unit 16 shown in FIGS. 3 to 5 is reached.

[0052] Due to a double translation of the force achieved in this way, namely via the actuating arms 34 and the cutting arms 26, a comparatively small force of the actuating unit 38 is required in order to achieve a comparatively high cutting force of the cutting portions 18. Because the actuating unit 38 has to apply less force, it can be made smaller or more compact.

[0053] The cutting unit 16 is opened analogously by the actuating unit 38 moving the two second ends of the actuating arms 34 back together in a relative movement. The pivot point 36 moves along the elongated hole 42 in FIG. 3 from bottom to top. The connection points 40 move toward each other and the cutting arms 26 pivot apart about the cutting pivot point 28 so that the cutting portions 18 move away from each other.

[0054] The movement of the cutting portions 18 is a superimposition of movements in two directions running perpendicular to one another. On the one hand, the cutting portions 18 move toward one another and back away from one another. On the other hand, due to the mechanics shown and the movement apparatus, the cutting portions 18 also move parallel to a straight line that runs through the pivot point 16 and the cutting pivot point 28. Thus, during the cutting process, the cutting portions 18 move toward the conductor piece 14 (or plurality of conductor pieces 14) to be cut to length or the stator core 12 and, after the cutting process, move away from the conductor piece 14 (or plurality of conductor pieces 14) that has been cut to length or the stator core 12 when the cutting unit 16 is opened.

[0055] In the illustrated embodiment, the cutting unit 16 has various inclined surfaces. For example, the cutting portions 18 are partially chamfered, as can be seen in particular in FIGS. 2, 4 and 5. Possible falling parts, e.g., cut-off conductor piece parts, should slide off the inclined surfaces and fall on the cutting unit 16 and/or through the cutting unit 16. They should not stick to or be left on the cutting unit 16, so that the function, and in particular the movement apparatus of the cutting unit 16, is not disturbed or even damaged.

[0056] FIG. 6 shows a perspective view of an arrangement of a plurality of cutting units 16. Due to the fact that the cutting unit 16 has a compact design and in particular a narrow design, a plurality of cutting units 16 can be arranged about the stator core 12 in a space-saving manner.

[0057] A first cutting unit 16 is arranged along the radial direction 22. The cutting portions 18 of the first cutting unit 16 therefore likewise move in the radial direction. In this way, a conductor piece 14 but also a complete row of conductor pieces extending in the radial direction can be cut to length via a single cutting process.

[0058] A second cutting unit 16 is oriented perpendicularly to the first cutting unit 16, i.e., perpendicularly to the radial direction 22 (tangential orientation). The cutting portions 18 of the second cutting unit 16 thus also move perpendicular to the radial direction (tangential to the circumferential direction 20). A conductor piece 14 or a plurality of conductor pieces 14 can thus be cut to length, in particular within a radially extending row of conductor pieces. For example, conductor pieces 14 can be cut to different lengths within the same row of conductor pieces.