| 摘要 |
The method and apparatus may be used for copying a reference winding in order to produce a production winding similar to a reference winding. With regard to making spools of sewing thread, the production winding may have the same length of thread and winding cross-section as the reference winding. Alternatively, the main aim may be to make production windings having the same cross-section as the reference winding. According to the invention, reference data is stored in a microprocessor system whilst making the reference winding. Production data is the derived whilst making the production winding. Corresponding instantaneous values of the reference data and the production data are compared in order to derive an error signal. The error signal is supplied to an adjustable tensioner, whereby the tension of the material is adjusted, whilst making the production winding, so that a production winding is made which is similar to the reference winding. One arrangement uses a measuring wheel and a revolution counter to provide the data. Another arrangement uses a revolution counter and an arm which pivots in response to an increase in the cross-section of the winding to provide the data. |
