ELECTRONIC SEWING MACHINE

摘要

An improved electronic sewing machine is provided herein which comprises the combination of several elements. A first electronic memory is provided for storing stitch control data for a plurality of stitch patterns which are selectively read out for controlling needle lateral amplitude and fabric feeding amount per stitch of a selected pattern. A second electronic memory is provided for storing auto-data which are each specific to each of the patterns stored in the first memory for automatically acting on each data of the selected pattern, thereby determining the optimum size of the pattern. First means is provided for detecting if the selected pattern is proportionally variable, which, in the affirmative, produces an address signal for reading out the initial stitch control data of the selected pattern from the memory and another address signal for reading out an auto-data specific to the selected pattern from the second memory. Second means are provided which are manually operated to produce first and second signals for modifying the stitch control data for the needle lateral amplitude and fabric feeding amount respectively, the second means including first and second switches which are selectively operated to make effective first and second signals and the auto-data. Third means are provided which are operated in association with a first state of the first and second switches to make effective the auto-data read out from the second memory, the third means being operated in association with a second state of the first and second switches to make effective one of the first and second signals. Calculating means are provided for receiving the stitch control data of the selected pattern from the first memory, the calculating means receiving the auto-data from the third mentioned means when the first and second switches are in the first state and calculating .../2 Page 2 such switch control data with the auto-data to produce a first set of modified data for producing a standard size of a selected pattern, the calculating means receiving one of the first and second signals when the first and second switches are in the second state and calculating the stitch control data with one signal to produce a second set of modified data for producing a proportionally reduced size of the selected pattern. Finally, drive means are provided which are operated in response to the modified stitch control data supplied from the calculating means to control the needle lateral amplitude and the fabric feeding amount.