Back to results
US 4,173,193 AGranted
Controlling apparatus for electric sewing machine
AssigneeHitachi, Ltd.
InventorsShigeki Morinaga, Takeo Maeda, Tadashi Takahashi, Kosho Ishizaki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHitachi, Ltd.
InventorsShigeki Morinaga, Takeo Maeda, Tadashi Takahashi, Kosho Ishizaki
Estimating the term…
An apparatus for controlling an electric sewing machine has a mechanism for transmitting the driving torque of a motor to the sewing machine to drive the same, a mechanism for imparting braking power to the sewing machine to stop the same, a mechanism for stopping the needle of said sewing machine at desired positions in its stroke and controlling means adapted to control these mechanisms. At least a part of the controlling means is constituted by a microcomputer. The signal input to the microcomputer is provided in synchronization with a synchronizing clock signal, and only such input signals as required in respective periods of operation are checked in each of the periods, so that the checking of the input signals is facilitated and accidents due to erroneous operation are avoided.
An apparatus for controlling an electric sewing machine comprising a motor, switch means providing control signals, clutch means for transmitting the driving torque of said motor to said sewing machine to drive the latter, braking means for selectively imparting a braking force to said sewing machine, means for detecting the position of the needle of said sewing machine and for generating a position signal at a desired position in its stroke, controlling means responsive to said control signals and said position signal for controlling said clutch means and said braking means to operate said sewing machine in accordance with a predetermined sequence, and clock means for controlling signal input and signal output to and from said controlling means so that such signal transfer is effected only in synchronization with a clock signal.
A system for controlling an electric sewing machine comprising a motor, clutch means for transmitting the driving torque of said motor to said sewing machine to drive the latter, switch means providing a plurality of input control signals, braking means responsive to a brake signal for imparting a braking force to said sewing machine, means for detecting the needle of said sewing machine at a desired position in its stroke and providing a detection output signal indicative of such position, control means responsive to such input control signals and detection output signal for controlling said clutch means and said braking means to operate said sewing machine in accordance with a predetermined sequence, including means for controlling said control means to respond during respective periods of operation of said sewing machine only to such control input signals and the detection output signal as required by said predetermined sequence, and clock means for controlling signal input and signal output to and from said control means so that such signal transfer is effected only in synchronization with a clock signal.
A system for controlling an electric sewing machine as claimed in claim 4, further including trimming means for trimming the thread in said sewing machine in response to said control means.
An apparatus for controlling an electric sewing machine comprising:
Dependencies are inferred from the claim text.