The Singer Company

Leonard I Horey

William H Dunn

Marvin Kurland

John W Wurst

Stephen A Garron

Bruce E Arnold

Gary D Jones

Edward A Salge

In an electronically controlled sewing machine which has the capability of accepting plug-in modules consisting of read only memories, a method is provided for checking the integrity of the module memory and the means for coupling the memory to the sewing machine controller. The controller reads the first two locations in the memory to check for the presence of alternating patterns of ones and zeros which indicate that shorted or open data lines are unlikely. Another location in the memory contains the number referred to as a checksum. The controller adds the contents of all the other locations of the module memory to this checksum. If the module is undamaged, this sum will be zero. If the sum is not zero, the controller recognizes that a faulty module has been inserted and advises the operator accordingly.

Method of checking the integrity of a source of additional memory for

An electronically controlled household sewing machine includes an arrangement for needle positioning. The machine responds to a tap of the foot controller for stopping the sewing machine at the next change of state of the armshaft timing signal.

Needle positioning arrangement in an electronically controlled household

A microcomputer controlled electronic sewing machine wherein the microcomputer operates in two modes of execution: a background mode for performing non-critical functions and an interrupt mode for performing functions dependent on the operational state of the sewing machine.

Operation controller for an electronic sewing machine

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.

Arrangement for operating an electronically controlled sewing machine in

An electronically controlled multiple pattern sewing machine is provided with the capability of sewing a repetitive sequence of patterns. The sewing machine operator selects, one by one, the patterns desired to be sewn and these are stored in a temporary memory in the order of their selection. In addition, each of the patterns may be modified such as by providing double feed, bight mirror, feed mirror, bight override and/or feed override. The arrangement also allows the operator to replace a previously selected pattern in a string with a different pattern at the same place in the string.

Electronically controlled sewing machine arranged to sew a sequence of

An electronically controlled sewing machine sews the mirror image of a pattern in the feeding direction by using for the first needle penetration the bight data of the first stitch of the pattern and feeds using the feed data of the last stitch of the pattern. Then the second needle penetration uses the bight data of the last stitch of the pattern, followed by feeding using the feed data of the next to last stitch of the pattern. This continues until the pattern is completed with the feed data of the first stitch.

Electronically controlled sewing machine arranged to sew the mirror

An arrangement for storing groups of twelve data bits in an eight bit byte organized memory utilizes three bytes for storing two groups of bits.

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West Orange, NJ, United States of America

Leonard I Horey