DEVICE FOR CONTROLLING THE DRIVE OF A REEL

• US 20110226885A1
• Filed: 10/12/2010
• Published: 09/22/2011
• Est. Priority Date: 03/22/2010
• Status: Active Grant

• Current Assignee: Wafios AG
• Original Assignee: Wafios AG
• Inventors: FRIES, Stefan, STEINHILBER, Werner, LENGERER, Helmut
• Granted Patent: US 8,382,024 B2
• Time in Patent Office: Days
• US Class Current: 242/420
• CPC Class Codes: B21C 47/16 Unwinding or uncoiling
• CPC Class Codes: B21C 49/00 Devices for temporarily accumulating material
• CPC Class Codes: B21F 23/00 Feeding wire in wire-working machines or apparatus applicable also to feeding rods or strips B21D43/00
• CPC Class Codes: B65H 51/10 with opposed coacting surfaces, e.g. providing nips
• CPC Class Codes: B65H 51/30 Devices controlling the forwarding speed to synchronise with supply, treatment, or take-up apparatus B65H59/10, B65H59/38 take precedence
• CPC Class Codes: B65H 59/387 Regulating unwinding speed

Abstract

With a device for controlling the drive of a reel, with a wire supply in the form of a coil of said wire supply, from which the wire, through interposition of a tensioning device, which is spring-pretensioned in one deflection direction and effective up to a maximum deflection, for approximated stabilization of the wire tension of a feed installation of the wire infeed of a downstream positioned wire processing machine, the velocity curve of the feed rate of the wire infeed in accordance with a preset velocity-time profile is controlled by a control unit of the wire processing machine, and whereby the curve of the rotation speed of the reel in accordance with a preset rotation speed-time profile is controlled by the drive control of the reel, whereby the drive control of the reel sets the rotation speed-time profile of the reel, with regard to the velocity-time profile of the feed rate, forward by a preset time interval.

Claims

1. A device for providing wire and controlling the drive of a reel, comprising:

a wire supply in the form of a coil on the reel, from which the wire, through interposition of a tensioning device, is spring-pretensioned in one deflection direction and effective up to a maximum deflection for approximated stabilization of a wire tension to a wire infeed device for a downstream positioned wire processing machine;

whereby a velocity curve of an infeed rate of the wire infeed device in accordance with a preset velocity-time profile is controlled by a control unit of the wire processing machine, and whereby a rotation speed of the reel in accordance with a preset rotation speed-time profile is controlled by a drive control of the reel, whereby the drive control of the reel starts the rotation in accord with the rotation speed-time profile of the reel set forward by a preset time interval with respect to the velocity-time profile of the infeed rate.

2. The device of claim 1, wherein the rotation speed-time profile of the reel is compiled from the velocity-time profile of the infeed rate, whereby a respective rotation speed of the reel is determined for every infeed rate of the velocity-time profile, and whereby a wire release speed of the reel equals the infeed rate of the wire infeed.

3. The device of claim 1, wherein the preset time interval is determined in such a way that a wire release length, supplied along its curve in accordance with the rotation speed-time profile of the reel, is smaller than a wire length which the tensioning device can compensate at the maximum deflection.

4. The device of claim 1, wherein preset values for a maximum acceleration and for a maximum deceleration of the reel are taken into account for the determination of the rotation speed-time profile of the reel, whereby in the case of acceleration and deceleration values in an acceleration phase and deceleration phase in the velocity-time profile which would lead to greater than the preset values for maximum acceleration and deceleration, respectively, at the rotation speed-time profile of the reel, the acceleration and deceleration values are replaced through the utilization of preset values for maximum acceleration and deceleration and the acceleration phase and deceleration phase are each temporally extended in such a way that the wire infeed length of the wire infeed corresponding to the acceleration or deceleration phase, correspond to the wire release length of the reel, released during the same time interval, whereby the beginning of an acceleration phase extended in such a way as well as the end of a deceleration phase extended in such a way remain unchanged when compared to the beginning and/or end of the corresponding acceleration or deceleration phase of the velocity-time profile of the infeed rate.

5. The device of claim 1, wherein the determination of the rotation speed-time profile of the reel from the velocity-time profile of the infeed rate is effected by the control unit of the wire processing machine and is transmitted from said machine to the drive control of the reel.

6. The device of claim 1, wherein unsteady velocity changes present in the velocity-time profile of the infeed rate are represented through steady profile transitions during the determination of the rotation speed-time profile for the reel.

7. The device of claim 1, wherein the rotation speed-time profile of the reel derived from the velocity-time profile of the infeed rate for the duration of the processing of one workpiece each during continuous manufacture of the same workpieces in the wire processing machine is replaced by a periodically changing rotation speed-time profile, which within the time interval of the processing duration of a workpiece supplies the same wire release length as the initially derived rotation speed-time profile and the graph of which thereby runs through an entire vibration period or an integer multiple of such a period.

8. The device of claim 1, wherein the control of the reel drive effects a continuous increase of the reel rotation speed compensating for a decrease of a diameter of the coil at an otherwise constant rotation speed-time profile curve.

9. A device for providing wire and for controlling the drive of a reel, the device comprising:

a reel containing a supply of wire in the form of a coil;

a wire infeed device downstream of the reel adapted to receive the wire from the reel and provide it to a wire processing machine;

a tensioning device interposed along the wire extending from the reel to the wire infeed device to spring-pretension the wire for stabilization of a wire tension of the wire; and

wherein a velocity curve of a infeed rate of the wire to the wire infeed device in accordance with a preset velocity-time profile is controlled by a control unit of the wire processing machine,

and wherein a rotation speed curve of the reel in accordance with a preset rotation speed-time profile is controlled by a drive control of the reel, and wherein the drive control of the reel starts the rotation of the reel in accord with the speed-time profile and set forward by a preset time interval with regard to the velocity-time profile of the feed rate.

10. The device of claim 9, wherein the rotation speed-time profile of the reel is compiled from the velocity-time profile of the feed rate and a respective rotation speed of the reel is determined for every feed rate of the velocity-time profile and wherein a wire release speed of the reel equals the feed rate of the wire infeed.

11. The device of claim 9, wherein the preset time interval is determined such that a wire release length supplied in accordance with the rotation speed-time profile of the reel is smaller than a wire length for which the tensioning device can compensate at the maximum deflection.

12. The device of claim 9, wherein the drive control of the reel includes preset values for a maximum acceleration and a maximum deceleration of the reel which are taken into account in determining the rotation speed-time profile of the reel and, if an acceleration phase and deceleration phase in the velocity-time profile would lead to acceleration and deceleration values that are greater than the preset values, the acceleration and deceleration values are replaced with the preset values and the acceleration and deceleration phases are each temporally extended such that a wire infeed length of the wire infeed during the acceleration phase and the deceleration phase correspond to a wire release length of the reel released during the same time interval, and wherein the beginning of the temporally extended acceleration phase and the end of the temporally extended deceleration phase remain the same as the acceleration and deceleration phases in the velocity-time profile.

13. The device of claim 9, wherein the control unit determines the rotation speed-time profile of the reel from the velocity-time profile of the feed rate and transmits the rotation speed-time profile to the drive control of the reel.

14. The device of claim 9, wherein unsteady velocity changes present in the velocity-time profile of the feed rate are represented through steady profile transitions during the determination of the rotation speed-time profile for the reel.

15. The device of claim 9, wherein the rotation speed-time profile of the reel for the duration of processing of one workpiece during the continuous manufacture of a plurality of workpieces in the wire processing machine is replaced by a periodically changing rotation speed-time profile within which a time interval of a processing duration of the workpiece supplies a same wire release length as the rotation speed-time profile and a graph of the rotation-speed time profile runs through an entire vibration period or an integer multiple of said period.

16. The device of claim 9, wherein the control of the reel drive effects a continuous increase of a speed of rotation of the reel to compensate as a diameter of the coil decreases at an otherwise constant rotation speed-time profile.

17. A method of providing wire, the method comprising:

providing wire to a wire feed device for a wire processing machine from a wire supply in the form of a coil on a reel,

controlling the speed of rotation of the reel in accordance with a preset rotation speed-time profile, and

causing the wire from the reel to be received at a wire infeed downstream of the reel at a feed rate in accordance with a preset velocity-time profile, wherein the preset rotation speed-time profile corresponds to the preset velocity-time profile.

18. The method of claim 17, further comprising the step of pretensioning the wire from the reel.

19. The method of claim 18, rotating the reel in accord to the rotation speed-time profile of the reel set forward by a preset time interval with regard to the feeding of the wire with regard to the velocity-time profile of the feed rate.