Abstract: A sewing machine having a work holder with a crank member in which a computing device is provided for computing coordinate values in accordance with the configuration of the work holder with the crank member and particularly, designed to convert coordinate values of a reference sewing pattern into coordinate values with the center of the crank member on the work holder with the crank member as the origin when the sewing pattern is enlarged or reduced in scale. When work holder with the crank member is returned to the sewing start point on the sewing pattern, the work holder with the crank member is returned in the direction of the X axis or Y axis depending upon the positional relationship between the existing position of the work holder with the crank member and a reference value.

Abstract: A tape marking and cutting device which can be operated to apply marking on tape and to cut the marked tape to a desired length. The sequence is controlled by a microprocessor which devices a pulse motor which in turn drives a tape feed roller. The feed roller drives the tape in correspondence with the desired marking interval and a marking device is actuated. After each marking, the feed roller feeds the tape corresponding to the remaining length and the tape is cut. The sequence can be preset in a program.

Abstract: A presser foot lift device for an upper feed sewing machine is so arranged that an upper feed tooth is initially lifted and then lifted along with a presser foot only after the lower surface of the upper feed tooth is at a position above the upper surface of the presser foot. This two-step lifting motion is made feasible by the combined operation of an elongated slot formed in a manually rotated actuating arm and a pin formed on an actuator pivotally mounted in coaxial fashion on a supporting shaft of the actuating arm and so adapted as to be introduced into the elongated slot.

Abstract: A thread feed device in a sewing machine is disclosed herein. The device comprises a thread paying-out member positioned in the thread path between the bobbin and needle, a pair of holding means positioned upstream and downstream of the paying-out member in the thread path and a control circuit for controlling of the operation of the holding means.

Abstract: A sewing machine for stitching a stitch pattern having a predetermined shape in accordance with stitch pattern data, comprising a memory circuit for storing an initial value indicating the needle swing position for stitch start, a basic stitch number indicating the stitch number required for the formation of one pattern, and quantity of needle swing every stitch pattern, a counter in which the high-order digit portion and the low-order digit portion have the same number of digits, and a control circuit for setting said basic needle number into the low-order digit portion of said counter, adding logic value "1" to each digit of the low-order digit portion, determining a needle swing position in accordance with the arithmetic data, and conducting automatic stitch of said stitch pattern in accordance with the needle swing position thus determined.

Abstract: A sewing control system for a sewing machine which comprises a count circuit for counting signals synchronized with the rotation of the sewing machine, a memory circuit for storing a reference value, a comparator circuit for comparing said reference value with the output value from said count circuit, an initializing circuit for initializing said count circuit only when there is a comparison output from said comparator circuit after said reference value is stored, and a circuit for outputting a sewing finish signal as data on the number of the works sewn only when there is a comparison output.

Abstract: A sewing machine with a workpiece holding-down device comprises an arm movable between an upper position and a lower position and normally biased to the upper position. An auxiliary workpiece holding-down member is movable between an upper position and a lower position in synchronization with the rotation of a main shaft and is normally biased to the upper position. A disengageable interconnecting means is interposed between the main shaft and auxiliary holding-down member. Electromagnetic means is energized upon starting of a sewing operation and is deenergized upon the completion of formation of a seam. An operation means is operable in response to energization of the electromagnetic means to impart an operative force to the auxiliary holding-down member and a holding-down arm and releases the operative force in response to the deenergization of the electromagnetic means.

Abstract: A printer in which a platen is secured to a machine frame, a carriage is movably supported on the machine frame for movement along the platen, a motor is movably supported on the carriage for reciprocal movement in a direction at right angles to the direction of movement of the carriage towards and away from the platen, a pedal type wheel is fixedly secured to the carriage and has a plurality of types, mating coupling means is formed on each of the motor and type wheel, detection means is provided to generate a detection signal upon detection of a particular rotational angle of the motor during one complete rotation of the motor, a drive circuit is provided to drive the motor and a control circuit is provided to determine presence of a detection signal and arrests the rotation of the motor when no detection signal is generated within a predetermined time period required for the motor to rotate one complete rotation.

Abstract: A thread feed mechanism in a sewing machine for paying-out thread in a predetermined amount necessary for forming one seam. The thread feed mechanism comprises a first signal generation device for producing feed amount and needle bar amplitude signals, a second signal generation device for producing a workpiece thickness signal, first means for adding square values of feed amount and amplitude signals, second means for multiplying a square root of the first means by a coefficient, third means for producing a signal varying depending upon the operation mode thereof, fourth means for multiplying a workpiece thickness signal by the output of the third means, and fifth means for adding the outputs of the second, third and fourth means.

Abstract: A backspace device in a typewriter comprising: an interposer operable by the operation of a key lever; a cycle bail operable by the interposer; a cycle clutch for intermittently transmitting a driving force from a driving source to a main shaft so that the main shaft can be rotated by a predetermined number of times in association with the cycle bail; an actuating bail for performing a cycle of a motion along a moving path of a predetermined mode by a full turn of the main shaft, while rendering to the interposer a motion in a direction of the interposer leaving the cycle bail during the motion; a backspace link for moving in association with the interposer during the leaving motion of the interposer; a backspace rack extending laterally of the typewriter, supported rotatably about an axis laterally disposed and turned to a working position by the backspace link; and a backspace pawl fastened onto a carriage so that it can be reciprocated a predetermined distance in the lateral direction by a cam rotatable in

Abstract: A workpiece holding-down device for a sewing machine comprises a spring-loaded presser bar and foot assembly supported in the framework of said sewing machine, a drive mechanism for moving said assembly vertically, and a control circuit for controlling the movement of said presser bar. The foot assembly includes signal means for positioning the presser bar and foot assembly in a controlled position in response to the actuation of an operation member or stored information.

Abstract: A feed roller device of a typewriter used for reliably urging a sheet of paper to be printed against a platen. In this feed roller device, a pair of feed roller assemblies are parallelly arranged in parallel to the axial line of the platen and rocking levers are provided at the central positions in the axial lines of the feed roller assemblies, respectively. Each of these two rocking levers is rockingly supported by a typewriter frame, pivotally supported at one end thereof by a connecting rod of one of the feed roller assemblies and provided at the other end thereof with a spring, which urges the feed roller assembly against the platen by the urging force thereof. Consequently, only two springs are used, so that the adjustment of the feed roller assemblies urging the platen in urging force can be facilitated.

Abstract: In a seam forming method and device for a sewing machine for embroidery, wherein a contour of a figure to be embroidered is converted into positional co-ordinates and read, data is calculated for alternately setting needle location points on opposing portions of the contour in such a manner that embroidery seams is formed in the contour corresponding to the positional co-ordinates thus read, and the data are read out and a needle is vertically moved to form the embroidery seams, with a taboret being moved in directions X and Y, with a figure including at least one side having a circular arc-shaped contour out of two opposing sides, needle location points are set at regular intervals circumferentially on a circular arc-shaped side, and needle location points on a side opposed to the circular arc-shaped side are set at points of intersections of the side opposed to the circular arc-shaped side with radial lines from the center of the circular arc passing through the midpoint of the needle location points on the

Abstract: The invention relates to a sewing device which includes a sewing machine fixedly provided on a horizontal top surface of a bench, a fabric transfer mechanism for holding and making a fabric movable on the tip surface of the bench between a first position and a second position with a machine sewing portion being interposed therebetween and a pulse motor interlocked with the fabric transfer mechanism to move the mechanism. The machine sewing is performed during the movement of the fabric transfer mechanism from the first position to the second position. The device further includes a memory portion for storing length data of a plurality of seam lines to be stitched on the fabrics, the seam lines being different in length from one another.

Abstract: A carriage return device in a typewriter including: an interposer operable through operation of a key lever for the carriage return; a cycle bail driven by the interposer; a driving source adapted to rotate a main shaft by a predetermined number of rotations in association with the cycle bail; a cycle clutch for intermittently transmitting a driving force to the main shaft; an actuating bail for performing a cycle of movement having a locus of a predetermined mode to cause the interposer to disengage from the cycle bail; a carriage return bell crank for operating in association with the interposer when the interposer moves in the direction of disengaging from the cycle bail; a carriage return clutch operable by the carriage return bell crank; a carriage driving device for driving the carriage to return through operation of the carriage return clutch; and a mechanism for operating to return the carriage return bell crank upon completion of carriage return; wherein the carriage return device further includes a