PRICE ROGER JOHN (AU)
INT STANDARD ELECTRIC CORP (US)
| US4310126A | 1982-01-12 | |||
| US3077313A | 1963-02-12 | |||
| US1928679A | 1933-10-03 | |||
| GB1063181A | 1967-03-30 | |||
| GB366812A | 1932-02-11 | |||
| GB153675A | 1920-11-15 | |||
| CH365311A | 1962-10-31 | |||
| CH325414A | 1957-11-15 |
| 1. | A wire feed needle for a coil winding apparatus, comprising a cylin¬ drical or annular member having an axial bore adapted to permit the wire to pass therethrough, and mounting means associated with the needle whereby the needle may be connected to a winding apparatus between a spool of wire and a coil bobbin. |
| 2. | A wire feed needle as claimed in claim 1, wherein the needle is a cy¬ lindrical member and wherein the mounting means comprises a block with one or more open ended bores adapted to receive a needle in the or one or more of the bores, there being a respective retaining screw associated with each bore to retain a needle therein. |
| 3. | A wire feed needle as herein described with reference to the accompa¬ nying drawings. |
| 4. | Coil winding apparatus comprising control means controlling the rota¬ tional drive means of a bobbin chuck adapted to carry a bobbin on which a coil is to be wound, the bobbin having one or more terminating pins, the control means also controlling the positioning drive means for a wire feed needle as claimed in claim 1 or claim 2 or claim 3, whereby the wire is led from the needle to the bobbin and the needle is constrained to move back and forth along the coil recess of the bobbin while the bobbin is rotated so that the coil layers are wound onto the bobbin, and the needle is moved axially outside the coil recess when the coil winding is completed, the needle then being located in a position where on further relative movement of the bobbin and the needle a termination winding..is formed on one or more of the termination pins. |
| 5. | Coil winding apparatus as claimed in claim 4 wherein the bobbin in¬ cludes first and second terminal pins and wherein the needle is positioned in the terminal winding position and the wire is attached to the first ter¬ minal pin by relative movement of the pin and the needle before the coil is wound. |
| 6. | Coil winding apparatus as claimed in claim 4 or claim 5 wherein the termination pin or pins are parallel with the axis and the bobbin is ro¬ tated when a termination is being formed. |
| 7. | Coil winding apparatus as claimed in claim 4 or claim 5 wherein the termination pin or pins are radial and the bobbin is oscillated on its axis and the needle is moved back and forth across the path of the pin such that the needle passes on opposite sides of the needle or successive passes when a termination is being formed. |
| 8. | Coil winding apparatus as herein described with reference to the ac¬ companying drawings. |
| 9. | A method of winding a coil on a bobbin having two or more termination pins comprising feeding the wire through a wire feed needle as claimed in any one of claims 1 to 3; forming a first termination on a first of the termination pins by relative movement of the needle and the pin, scanning the needle across the coil cavity of the bobbin at a rate determined by the number of turns per layer and the wire diameter and rotation speed of the bobbin; at the completion of the winding of the coil moving the needle to a position where the wire can engage a second termination pin and, causing relative movement between the second pin and the needle whereby the wire is wound around the second pin. |
| 10. | A method as claimed in claim 9 wherein the termination pins are ra¬ dial with respect to the coil axis and wherein the pin is oscillated on the axis and the needle is moved back and forth across the path of the pin, or successive passes passing on the opposite sides of the pin whereby the wire is wound round the pin. |
| 11. | A method of winding and terminating a coil as herein described with reference to the accompanying drawings. |
| 12. | Apparatus for winding a coil by the method of any one of claims 9. 10 and 11. |
Technical Field
This invention relates to a modification to a coil winding machine. It has particular application to processor controlled winding machines and is particularly useful in the winding of small coils with either radial or axial connection posts. Background Art
Known controlled winding machines comprise a winding lathe, the rota¬ tion of which-may be accurately controlled in the axial direction (Z direc- tion) . In these machines the axial position of the feed is controlled in relation to the winding rate so that when the required number of turns per layer have been laid the direction of travel of the feed arm is reversed for the laying of the next layer. However it has been found that these ma¬ chines do not operate satisfactorily when winding small coils on small bobbins with fine wire particularly where the terminal posts are close to¬ gether.
The feed point on the known machines comprises a pulley from which the wire is fed to the bobbin. Thus if the wire is pulled to the side from the pulley it may become "derailed" and thus become entangled. An attempt to overcome this has been made by feeding off through a narrow "U" section formed between a pair of parallel rectangular arms after the pulley. How¬ ever this has provided only marginal improvement. Summary of the Invention
This specification discloses a coil winding machine attachment which comprises a hollow needle through which the wire is fed. The attachment may be used with programmable winding machines and can be used to automat¬ ically terminate the winding on the pins in the coil former because of the precise positional location of the wire fed from the end of the needle. Brief Description of the Drawings
The invention will now be described with reference to the drawings in which:
Pig. 1 schematically shows the bobbin and wire feed;
Pig. 2 illustrates some of the factors involved in forming a termi¬ nation;
Pig. 3 is a block diagram showing coil winding apparatus embodying the invention;
Pig. 4 shows a method of terminating on radial pins. Best Mode of Carrying out the Invention There is described a wire feed needle for a coil winding apparatus, comprising a cylindrical or annular member having an axial bore adapted to permit the wire to pass therethrough, and mounting means associated with the needle whereby the needle may be connected to a winding apparatus be¬ tween a spool of wire and a coil bobbin.
A method and apparatus for coil winding are also disclosed.
This specification discloses an eyelet or needle with an axial hollow through which the wire is fed and adjustably attachable to the wire feed via e.g. an adjustable arm, which can be positioned so that the outlet of the needle or eyelet lies closer to the external circle of revolution of the bobbin or winding post. Preferably the outlet should be arranged so that the distance from the outlet to the winding point is not more than a particular distance which varies inversely with the wire diameter. Also it is desirable that the angle between the wire and winding axis in the termi¬ nation mode lies between certain limits. This angle is determined by the axial displacement of the feed point from the winding point, Zl in Pig. 1 which may be controlled by the processor, and the radial distances, XI, X2, of the feed point from the termination post. If the angles 01, 02 are too small the terminating winding pitch will be too great and the termination will be too loose particularly when the windings on the termination post are compressed.
On the other hand the presence of other winding posts, frequently at a small distance, militates against too large an angle. Prom Pig. 2 it is seen that, where there is more than one terminal pin, the length of the pin
2 and the distance between pins p at what might appropriately be described as the "eclipse angle" in which the tip of the interfering pin aligns with the base of the termination pin and the tip of the feed needle.
As seen in Pig. 1, needle 5 is mounted in a through bore in block 8 and retained therein by screw 7. Further bores and screws may be provided in block 8 if dual or more winding are to be employed. Block 8 is shown mounted by bracket 6 to wire spool 9. This assembly may be driven controllably along a shaft or rail (not shown in Pig. l)(see Pig. 3), or may be mounted on a robot arm or other suitable position controlling means.
In Pig. 1 bobbin 1 is mounted on a processor controlled lathe chuck (not shown). There is a notch-3 in the bobbin end piece through which wire 4 is led from the winding by the movement of the feed needle 5 to the right along the Z axis after the coil has been wound. Further rotation of the bobbin causes a wire wrap connection to the terminal post 2. Angles 01 and 02 indicate minimum and maximum angles of the wire to the Z axis. These are determined by distances XI and X2 and Zl. During winding of the coil the feed needle 5 may be positioned adja¬ cent the bobbin by the controller and controlled to traverse axially as the winding layers are wound onto the bobbin. The rate of traverse is deter¬ mined by the number of turns in a layer. The needle moves to and fro be¬ tween A and B until the required number of turns have been laid. The revolutions of the bobbin are controlled with sufficient precision that the notch 3 in the bobbin wall is in the correct position to allow the wire to pass through the notch when, after the coil has been wound and the bobbin halted, the needle is moved to position C.
The needle may be mounted on a shaft parallel with the lathe axis and set at an appropriate distance therefrom. The needle can travel along the
shaft under control of the controller. The shaft may also be moveable un¬ der control of the controller to adjust the relative position of the shaft and the lathe axis. Alternatively the needle may be mounted on a robot arm.
When the coil is commenced the operator may lead the wire to the first pin and the machine will wrap the terminal as above. Then the dispensing head moves to be adjacent the bobbin and traverses to and fro along the bobbin while the bobbin is rotated. The bobbin is aligned on the lathe so the position of notch 3 is known to the machine, and the wire is led out through the notch to engage the second pin, the co-ordinates of which are also prograπmed, and terminated as above.
In a further modification of the arrangement a coil consisting of a pair of parallel wires may be wound and terminated at one time by having two or more feed needles spaced apart by the pitch of the terminating pins, or at least spaced apart so that each wire is terminated on its appropriate pin. It is not essential that the feed needle spacing correspond exactly to the pin pitch, so long as each pin lies within the "capture cone" of each wire and the wires are not interfered with by other pins. However in the simplest arrangement the pitch of the needles is the same as the pitch of the terminating pins.
Radial pins may be terminated by oscillating the bobbin back and forth on its axis in synchronism with a corresponding axial oscillation of the needle so that the needle passes on different sides of the pin in each pass.
Thus as shown in Fig. 4 the wire W leads from the needle 5 in position V to pin 2 which is in position R. The pin is then swung across to posi¬ tion 5, Wl being the new wire position. The needle then moves to U. The pin returns to R and then the needle returns to V. This process may be re¬ peated for as many termination turns as are required.
In Fig. 3 the controller 31 controls the position of needle 5 so it is in the appropriate position or moving on the appropriate path when the wire is being terminated on a pin. The controller also moves the needle to be adjacent the coil cavity of bobbin 1 while the coil is being wound. The needle is scanned back and forth across the cavity at a rate determined by the rotation speed of the bobbin. The thickness of the wire, (and packing factor), and each scan is reversed when the correct number of turns have been laid. Industrial Applicability The attachment may be used in winding electric coils and is partic¬ ularly useful where the coil is of fine wire.