Programmable variable speed for sewing machine

US4108090A · kind A · utility

Assignee

• The Singer Company Limited · US

Inventors

• John Vernon Landau, Jr. · Mountain Lakes, US
• Frederick A. Rupinski · Lyndhurst, US

Key dates

• Filing date: Mar 21, 1977
• Grant date: Aug 22, 1978
• Expiry date: Mar 21, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B19/102
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A programmable sewing machine adapted to learn and store, in Automatic Learn or Key Learn Modes of operation, a series of sewing machine operations for later automatic duplication, in an Automatic Sew Mode of operation, at the same sewing rate as the initial operation, or at the peak sewing rate achieved during each operation; or, in a Control Sew Mode of operation at a controlled lower speed. A software program enables the speed profile of an initial sewing operation to be stored in memory as a number (at least one) of pseudo segments of variable time duration. Each pseudo segment has a fixed sewing speed associated therewith. By applying these stored speed values to a digital to analog converter and applying the resulting voltage to the sewing machine drive motor, the speed profile recorded can be substantially faithfully duplicated. The automatic operation of the sewing machine may be interrupted to go into a Repair Mode during which the sewing machine may be operated manually, and, on proper command, to revert back to the Automatic Sew Mode at the particular operation which was interrupted. A Quit control is provided which permits reversion to an Initialization Mode from which …