Method and apparatus for performing sewing operations utilizing sewing machine having means to adjust terminal stitch pitch and sew consecutive patterns

• US 4,682,554 A
• Filed: 06/02/1986
• Issued: 07/28/1987
• Est. Priority Date: 05/31/1985
• Status: Expired due to Fees

• Current Assignee: Tokyo Juki Industrial Company limited
• Original Assignee: Tokyo Juki Industrial Company limited
• Inventors: Goto, Sumio, Ishibashi, Jiro, Nemoto, Masakazu
• Primary Examiner(s): Nerbun, Peter
• Application Number:
  US06/869,678
• Time in Patent Office: 421 Days
• Field of Search: 112/454, 112/275, 112/121.11, 112/121.12, 112/315, 112/314, 112/277, 112/262.1, 112/2, 112/272, 112/266.1
• US Class Current: 112/470.03
• CPC Class Codes: D05B 69/20 Control devices responsive to the number of stitches made
• CPC Class Codes: G05B 19/408 characterised by data handling or data format, e.g. reading, buffering or conversion of data
• CPC Class Codes: G05B 2219/36511 Select by a detector

Abstract

A sewing machine capable of multiple functions including terminating stitches at a predetermined point, carrying out predetermined stitch patterns, automatic stitch pitch adjustment, stopping at preset points and thread cutting without operator intervention. These operations are controlled by means of a computer interface with the sewing machine and can carry out labeling, pocket attachment, collar attachment, cuffs etc. at preset intervals.

Claims

1. A sewing machine capable of automatically adjusting stitch pitch to terminate the last stitching at a predetermined margin distance by calculating a number of stitches with original pitch and the adjusted pitch which is shorter than the original pitch when a workpiece end sensor detects the workpiece end, comprising:

storing means to store stitch data corresponding to a plurality of different stitch patterns;

detecting means for detecting end of a stitching cycle;

selection means for selecting stitch data corresponding to a subsequent stitch pattern from said storing means when end of one stitch cycle is detected;

calculating means for calculating stitch pitch by referring to said selected stitch data corresponding to a subsequent stitch pattern selected by said selection means; and

adjusting means for automatically adjusting stitch pitch.

2. A method for performing sewing operations on a workpiece using a sewing machine capable of adjusting stitch pitch to terminate the last stitching at a predetermined margin distance by calculating a number of stitches with original pitch and the adjusted pitch which is shorter than the original pitch when a workpiece end sensor detects the workpiece end, said method comprising the steps of:

storing stitch data corresponding to a plurality of different stitch patterns;

detecting the end of a stitching cycle;

selecting the stitch data corresponding to a subsequent stitch pattern from the stored stitch data when the end of a stitching cycle is detected;

calculating the stitch pitch by referring to said selected stitch data corresponding to a subsequent stitch pattern; and

adjusting stitch pitch.