Industrial automatic pattern stitching machine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKohichi Ohniwa
Life of this patent
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Abstract
An industrial automatic pattern stitching sewing machine in which the speed of a cloth holder feeding cloth at a sewing needle is limited to a predetermined maximum speed in any direction so that the movement of the cloth holder is always in synchronization with that of the sewing needle. With this arrangement, pattern irregularities and jamming caused by nonsynchronization between the cloth holder and sewing needle are eliminated. Pulse numbers from a stored stitching pattern are examined to determine which of the X and Y pulse numbers is the larger. The larger of these is compared with a stored maximum value. If the larger number is less than the stored value, the two pulse numbers are outputted directly. Otherwise, at least one of them is limited to the maximum value.
Claims6
A pattern stitching machine comprising:
- a memory for storing predetermined stitching patterns;
- a sewing machine head for stitching a selected one of said stitching patterns on a cloth, said sewing machine head having a cloth holder and drive means for moving said cloth holder in response to driving pulses;
- and
- means for determining a number of driving pulses to be supplied to said drive means in response to data from said memory representative of said selected stitching pattern, said control means including means for limiting said pulses applied to said drive means if a speed of said cloth holder would exceed a predetermined limit speed for said data from said selected stitching pattern.
Dependencies are inferred from the claim text.