# US 4,393,796 A · Arrangement for operating an electronically controlled sewing machine in a diagnostic mode

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- Number: US 4,393,796 A
- Document ID: US4393796A
- Status: Granted
- Kind: A
- Application number: 06/393,148
- Filed: 1982-06-28
- Granted: 1983-07-19
- Earliest claimed: 1982-06-28
- Assignees: The Singer Company
- Inventors: William H. Dunn; Leonard I. Horey; Marvin Kurland
- Web page: https://patentgrep.com/patent/US4393796A

## CPC

- G05B 19/0428: {Safety, monitoring (G05B19/0423 takes precedence)}
- D05B 69/36: Devices for stopping drive when abnormal conditions occur, e.g. thread breakage
- G05B 2219/24069: Diagnostic
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- D05B: SEWING (appliances for the tailoring trade A41H; sewing tables A47B29/00; sewing in bookbinding B42B2/00; sewing machines modified for knitting D04B39/08)

## Abstract

An electronically controlled sewing machine includes an arrangement for operating the machine in a diagnostic mode, wherein several tests for checking the functioning of the sewing machine can be performed. In a first test, all of the light emitting diodes on the panel of the sewing machine are sequentially energized. This verifies proper operation of the display panel. In a second test, a particular light emitting diode responds to the armshaft sensor such that it is dark when the needle is up and is illuminated when the needle is down. The motor speed function is monitored by a test which lights particular light emitting diodes in 100 stitches per minute increments of motor speed. Proper overall operation of the sewing machine, including the actuators, is monitored by running several test patterns. To isolate a possible fault in the sewing machine foot controller, the sewing machine may be run at a preset speed without depressing the foot controller.

## Claims

### Claim 1

An electronically controlled multiple pattern sewing machine having operator controlled input means for selecting functions to be performed by said sewing machine, indicating means for providing an indication of the function selected by an operator via said input means, diagnostic means for operating said sewing machine in a diagnostic mode, said diagnostic means utilizing said indicating means for providing an indication to said operator of the operation of said sewing machine while in said diagnostic mode, and operator controlled means for selectively causing said diagnostic means to be operative.

### Claim 2 (depends on 1)

The sewing machine according to claim 1 wherein said diagnostic means includes means for controlling said indicating means to indicate said sewing machine functions in a predetermined ordered sequence and at a regular rate.

### Claim 3 (depends on 2)

The sewing machine according to claim 2 wherein said indicating means includes a plurality of light emitting elements and said controlling means includes means for controlling said indicating means to energize said light emitting elements one at a time each for a predetermined time.

### Claim 4 (depends on 1)

The sewing machine according to claim 1 further including motor control means for controlling the speed of operation of said sewing machine and said diagnostic means includes means for monitoring the speed of operation of said sewing machine and means responsive to said monitoring means for utilizing said indicating means to indicate said speed of operation.

### Claim 5 (depends on 4)

The sewing machine according to claim 4 further including an operator settable member communicating with said motor control means for operator control of the speed of said sewing machine and said diagnostic means includes means for controlling said motor control means to operate said sewing machine at a predetermined speed independent of said operator settable member.

### Claim 6 (depends on 1)

The sewing machine according to claim 1 wherein said diagnostic means includes means for utilizing said indicating means to indicate the relative position of the sewing machine needle.