Abstract: Method and apparatus for preparing sewing data for an automatic sewing apparatus which embroiders an embroidery pattern on cloth using a zigzag chain stitch while moving one or both of a cloth retainer and a sewing machine relative to each other. When a pattern corresponding to a basic sewing data group stored in a memory device is to be embroidered either magnified or reduced in size, in order to set a desired stitch density (P), which is the pitch of the stitches, three items of basic sewing data are read out from the memory device as one processing unit. After these items of data have been multiplied by a specified magnification to obtain sewing data (A,B,C), a pattern range which corresponds to the sewing data is divided by a particular stitch density in order to calculate correction data ( .circle.1 to .circle.21 ).

Abstract: A presser foot control for a sewing machine comprises a solenoid and two springs having different spring constants arranged in series with a transmitting lever and a starting lever. A first weaker spring is set in a "previously-pulled" condition and is connected in series with a second, stronger spring. The solenoid force first pulls on the stronger, unloaded spring. Thereafter, the weaker spring, which has been pulled previously into a loaded condition, is pulled and presses the presser foot causing the workpiece to be pressed against the table. Despite variations of thickness in a workpiece, the invention is effective to clamp the workpiece with a substantially constant pressure value.

Abstract: A sewing machine control apparatus is adapted to move a needle rod to a predetermined stitching starting point automatically when a stitching operation is performed, even if a fabric holding body holding an article to be stitched is displaced relative to the needle rod. The apparatus is equipped with operating means for generating a signal which displaces the fabric holding body in an X-Y direction, second control means responsive to the signal for controlling drive means to move the fabric holding body starting means for generating a signal which starts a driving source of the sewing machine, third control means for storing a signal indicative of the position of the fabric holding body while constantly revising the signal, and fourth control means for controlling the drive means in response to the start signal in such a manner that the fabric holding body is moved from any position to the stitching starting position.

Abstract: A control device for sewing machines includes an input device adapted to permit the input of different categories of information including program relative commands, unit sewing pattern relative commands, and numeric data and a discriminator capable of discrimination between a command for programming and one for program execution. The former commands are stored in a memory as program data and the latter commands are read out by means of a program read-out. In a comparitor, the read-out program data are compared with the actual data detected by a detector such as the number of stitches and the lock position of a needle arm. On the basis of this data, a fabric feed mechanism and a thread cut mechanism are ON/OFF controlled. Thus, a variety of sewing patterns can be programmed as required for subsequent readily effected and efficient execution so that operation can be optimal.

Abstract: A moving element body apparatus of a linear motor is produced by punching and processing a magnetic soft iron sheet into a large number of pole pieces formed therein with a plurality of magnetic poles having a predetermined distance therebetween, building up in layers said pole pieces into at least two pole bodies, providing said pole bodies with wheel axles, and fitting said magnetic poles of said pole bodies into openings formed in a holder plate of a nonmagnetic material for receiving said magnetic poles, thereby interconnecting securely said pole bodies and fixing said wheel axles to the pole bodies.

Abstract: The present invention relates to polychromatic thermal printer of transferring type designed to print with any color selected from monochromic colors and mixed colors on a recording medium by arranging printably on said recording medium a plurality of ink ribbons having different colors to each other and received in a plurality of different cassette ribbons and by actuating selected thermal head from a plurality of thermal heads incorporating a plurality of separated heaters capable to be actuated selectively.

Abstract: A detector for detecting the angular position of the main shaft of a sewing machine and the indicator apparatus of a sewing machine are utilized to output the RPM of the main shaft to the indicator apparatus. The detector detects the cycle time of the main shaft rotation by referencing a clock signal and comparing it with preset data. Thereby, the RPM of the main shaft is determined.

Abstract: An input device for a sewing machine is partially provided in a portable unit connectable to a sewing machine. Efficiencies are achieved by relying on input portions present in the sewing machine. The portable input device includes control portions for inputting a stitch pattern, test running a stitch pattern, modifying a stitch pattern, writing a stitch pattern, and reading a stitch pattern. When the portable input device is coupled to the sewing machine, the stitch patterns may be executed.

Abstract: An input device for sewing machines comprising a means for making visible the sewing pattern up to the inflection point immediately followed by the inflection point to be modified to facilitate the modification of the sewing pattern, a means for inputting the coordinate data of the inflection point to be modified, a means for indicating the contents of the modification, and a means for operating the contents of the modification thus indicated under a predetermined control.

Abstract: A dust protection device provided at an inlet portion of a magnetic disc drive allows insertion and ejection of a disc without exposing the inside of the disc drive. The dust protection device includes an upper cover which closes by gravity and a lower cover which opens and closes in conjunction with the movement of a slider in the disc drive.

Abstract: There is disclosed an overedge width regulating device capable of adjusting overedge width by rotating a knob which causes both a overedge-width latch and a lower knife to move simultaneously. The device permits adjustment of the overedge-width latch independently from the lower knife and the release of the overedge-width latch during the roll hemming process. Thus, without regard to material being sewn, knitted or woven, a tight and well-balanced overedge finish is obtained while, at the same time, the overedging process is greatly improved from the viewpoint of both quality and time.

Abstract: Inaccurate duplication of the first and the secnd prints due to the inequality of the distance and arrangement therebetween occurs in a serial printer in which a carriage is moved parallel to a platen by a servo motor etc. The first printing in duplex printing is performed after sufficient time for damping of the oscillation of the carriage in this invention. The second printing is done after sufficient time for damping of the oscillation as well as before. The control may be performed by sensing the necessary carriage displacement. The duplex printing may be performed when the displacement is zero or a small value.

Abstract: A movement control apparatus for a sewing machine to automatically control movement initiating timing corresponding to various sewing machine speeds.

Abstract: A sewing machine capable of multiple functions including terminating stitches at a predetermined point, carrying out predetermined stitch patterns, automatic stitch pitch adjustment, stopping at preset points and thread cutting without operator intervention. These operations are controlled by means of a computer interface with the sewing machine and can carry out labeling, pocket attachment, collar attachment, cuffs etc. at preset intervals.

Abstract: In a sewing machine, a presser foot lifting mechanism provides two springs, a first spring the compression of which can be changed by a solenoid actuated coil linkage and a second spring the compression of which can be changed by an operator's knee-action for lowering a presser foot. An operation lever rotated by an operator's knee-action controls the timing of solenoid action. A positional difference or gap is provided for the operation lever between a "solenoid on" position and a "first spring off" position, so that an operator can rotate the operation lever without feeling the resisting force of the first spring.

Abstract: An automatic embroidery machine capable of switching to stitch urgently required patterns although the machine is scheduled to stitch patterns previously input through a central processing unit from random access memory. The urgently required patterns are given priority by input of a priority code, a discrimination code corresponding to the required pattern, a stop code, etc., during current stitch work.

Abstract: The printer is characterized by construction adapted to detect the offsetting of the carriage from its intended position by signals of a sensor which detects the carriage offset at a first position spaced by a predetermined distance in the opposite direction of the home position of the carriage and at a second position which is the home position.

Abstract: An input device for sewing machines is disclosed which reads from a memory circuit an original sewing pattern which has been already stored, enlarging or reducing the coordinate data of the original sewing pattern in a desired scale, and prepare the coordinate data of sewing points between the flexing points thus obtained by enlargement or reduction in accordance with a desired stitch length data or stitch number data. The input device is adapted to convert the coordinate data of the original sewing pattern to the coordinate data calculated with the central point of a crank member of a work holder with the crank member as the origin and enlarge or reduce the coordinate data of the flexing points other than the starting point and the ending point of sewing in a desired scale, when the original sewing pattern is for a work holder with a crank member.

Abstract: There is provided an automatic sewing machine which comprises, a main shaft, a bed, a needle bar having a needle secured to the lower end thereof, a thread straining control device, an operation device and an alarm device.

Abstract: Stitch patterns are converted into coordinate data by an optical scanner employing a charge coupled device (CCD) which provides multiple PN diodes internally (providing X-direction coordinates), and a pulse motor driven by a predetermined pulse (providing Y-direction coordinates). The coordinate data are stored in random access memory (RAM) via a central processing unit (CPU), thereby eliminating the conventional manual work of inputting data for each stitch point.