Abstract: Embroidery pattern positioning apparatus and embroidering apparatus is disclosed, wherein a pattern is projected on a cloth F on which the pattern is embroidered. The projected pattern is moved on the cloth by operation of jog keys 6 to determine a position of the pattern where the pattern is stitched. In the meantime the original position of a carriage is adjusted or the position of the pattern is calculated and memorized in accordance with the moving amount of the pattern. This operation may be repeated as to each of plural patterns selected to be stitched such that a plurality of patterns may be stitched respectively at the positions determined and memorized.

Abstract: A lock stitch sewing machine with an automatic thread tension adjusting device is disclosed, wherein the sewing machine has a plurality of thread tension adjusting mechanisms 7, each of which including a pair of thread tension disks 12, 13, one of which is normally pressed by a spring toward the other. A sensor 4 is responsive to the operation of a thread tension releasing lever 20 made by a user with a slight touch applied thereto to give a signal. A CPU1 is responsive to the signal to compare the value of the existing thread tension of the thread tension adjusting mechanisms 7 with a predetermined one. If the value of the existing thread tension is higher than the predetermined one, the CPU1 is operated reduce the value of the existing thread tension to a predetermined one. Thus the tension releasing operation ability is increased.

Abstract: Disclosed is a device for producing embroidery pattern stitch data, wherein a pattern or patterns may be entered or selected from a memory (3) and the like and optionally positioned. It is discriminated if the selected pattern or patterns may be wholly received in a predetermined stitch area. If the selected pattern or patterns may not be wholly received in the stitch area and partly extend beyond the stitch area, print data may be produced for printing the selected pattern or patterns, and simultaneously for printing reference marks defining the positions and angles of the patterns relative to the work holding frame for holding the work to be stitched.

Abstract: A detection of a broken embroidering thread is repeated several times, and an erroneous detection is prevented by repeatedly detecting an actual breaking. An embroidering operation is re-started from a position a few stitches apart from the thread breaking position, so that a sightly embroidering continuation may be formed. When a first breaking is detected, reading-out of new embroidering data is stopped, and the repeated detections at several times are made by moving a needle vertically at the same position or a slightly displaced position.

Abstract: A switching device is provided for a sewing machine for switching operation of the sewing machine from a zigzag stitching to embroidering or vice versa. The switching device comprises a rotatable disc fixedly mounted on an output shaft of a stepping motor and a sliding member that movably connects one end of a transmission rod via a pin, the other end of which is connected to a needle bar supporter or a fabric feed device, with the rotatable disc so that the one end of the transmission rod is movable between a first position on the rotatable disc which coincides with the center of rotation of the rotatable disc, and a second position on the rotatable disc which is spaced apart from the center of rotation of the rotatable disc.

Abstract: A device for switching between normal and embroidering stitching comprises X-directional and Y-directional drive control devices for controlling movement of the embroidering stitching device in X- and Y-directions, respectively, and two stepping motors for driving a needle bar control device or the X-directional drive control device, and a feed control device or the Y-directional drive control device, respectively. Two switching elements alternatively connect the first stepping motor with either of the needle bar control device or the X-directional drive control device, and the second stepping motor with either of the feed control device or the Y-directional drive control device, respectively, to provide for normal and embroidering stitchings, respectively.

Abstract: An embroidering device for a sewing machine includes an embroidering frame and a first driving member to be connected with the feed dog of the sewing machine for driving the embroidering frame in a direction transverse to lateral swinging and vertical reciprocating directions of a needle bar of the sewing machine. A second driving member is connected with the needle bar support for driving the embroidering frame in the lateral swinging direction of the needle bar.

Abstract: An embroidering machine which comprises a device for adjusting a size of a selected pattern, a device for storing the adjusted size, and an arrangement for storing upper and lower critical sizes of the selected pattern. The embroidering machine according to the invention further comprises a discriminating device for determining if the adjusted size of the selected pattern is larger or smaller than the upper or lower critical size of the selected pattern. There is further provided a control unit which, in response to determination that the adjusted size of the selected pattern is larger or smaller than the upper critical size of the selected pattern or larger or smaller than the lower critical size of the selected pattern, calculates data for controlling the positions of a fabric holding frame carrying a cloth to be embroidered with respect to a vertically reciprocating needle.

Abstract: A method of setting visually balanced spacing between characters to be embroidered by an embroidering sewing machine in which character forming information which is stored with a preset reference size is successively read out and the characters are displayed and aligned between two parallel line segments. The aligned characters are first arranged in such a manner that the contours of consecutive characters contact each other at least at one point. Then the space areas between characters are calculated and a maximum area of the calculated space areas is set as a reference space area; then increasing the distances between the characters such that the other space areas between the characters become equal to the reference space area; and finally arranging the characters at spacings which have been increased by a computed minimum distance.

Abstract: An automatic pattern sewing machine includes a memory for storing blocks of data for controlling the sewing of an applique piece on a base cloth. A separate sheet of paper is printed with a set of patterns corresponding to different sizes of an applique pattern of one type and with corresponding identification marks. The applique piece is prepared in conformity with the printed pattern of the selected size and the assigned printed identification mark is entered into the machine by a selecting key to activate a coordinate transforming means which adjust the stored data to the selected size of the pattern. The applique piece is then stitched along its perimeter onto the base cloth according to the adjusted information.

Abstract: Alphanumeric characters are stitched along a curve produced by the R-X coordinate transformation wherein the X-coordinate is curved in relation with a radius while the Y-coordinate remains straight. The characters to be stitched on a fabric are arranged within concentric curves which are determined by a position of the center of the arc with respect to a frame of the alphabetic or numeric character, the height of the frame and the radius of the arc.

Abstract: In a device for detecting a type of an embroidering frame used, an infrared reflection detecting sensor is positioned on the base fixed to the table of the sewing machine and a movable member having pins is provided to move the embroidering frame in the X and Y coordinate directions. A supporter has holes provided at positions corresponding to the infrared reflection sensor which detects the number and positioning of said holes whereas the detected values are inserted into data indicative of the size of the embroidering frame.

Abstract: In a wire-dot impact type printer a cylindrical platen and a printing paper are rotated or transported at the same rate, by connecting them to a single and common electric motor through a first and second transmission mechanisms, respectively. The first transmission mechanism directly connects the platen to the motor to cause the former to rotate together with rotation of the latter in any direction, whereas the second transmission mechanism includes a clutch composed of a first and a second members rotatable about a common center axis but separately from each other in which the first member is caused to rotate together with rotation of the motor in any direction while the second member is caused to rotate together with the first member being rotated in one direction but prevented from rotating when the first member is rotated in the other direction. In the latter case the platen is rotated for color changing operation, but the printing paper is prevented from running through the printer.

Abstract: A printer of a wire-dot impact type is provided forwardly of the housing an inlet opening for introducing a printing paper to the inside and has an outlet opening provided at a rear side of the housing for discharging the printing paper to the outside. The printing paper is transported by cooperation of a tractor arranged near the outlet opening and a feed roller arranged near the inlet opening, to thereby run inside the housing in substantially a straight path of travel from the inlet opening to the outlet opening, during which the printing paper is printed by means of a platen and a printing head, both provided between the feed roller and the tractor. A pair of guide members are provided between the feed roller and the printing unit and between the printing unit and the tractor, respectively, to thereby feed the printing paper along the straight path of travel.

Abstract: A specific pattern for adjusting a fabric feeding amount in an electronic sewing machine with a storage for storing stitch control data for a plurality of different patterns. The specific pattern includes a 1st stitching group stored in the sewing machine and used for stitching the whole pattern in a reverse feed, a 2nd stitching group which coincide with the first one when a feed reference point is adjusted properly, and at least a 3rd stitching group which is stitched by a plurality of forward feeds and rearward feeds and is positioned in opposition to the 1st stitching group relative to a middle basic line, and gives to the 2nd stitching group accumulative errors of the forward feed and the rearward feed, so that a balance between the feeding amounts in a forward and a rearward directions of stitching is conformed.

Abstract: This invention relates to a computer controlled sewing machine, and more particularly to such a sewing machine which is incorporated therein with a plurality of feed adjusting switches for giving information to a micro-computer housed in the sewing machine, in order to correct irregularities of forward and backward feed amounts.

Abstract: The printing mechanism of a dot matrix printer includes a platen provided on its jacket with elongated ink impregnated sintered bodies each extending over the entire length of the platen. The platen is movable in the printing direction at one side of a printing paper. A printing head moves in the same direction but at a different speed at the opposite side of the paper so that impact wires strike different points on a preselected sintered body during the printing of a line.

Abstract: With respect to a printer which carries out printing on a paper by impact of a wire of a printing head repeating movement, a sound proof device of a printer prevents the paper from transmitting fluttering under amplification to the paper sent to an entrance of the printer, and does not cause inconvenience to sending of the paper.

Abstract: A printer of the dot impact type which prints by guiding a printing paper between a printing head and a platen which is composed of a plurality of sintered bodies containing inks of different colors, and attaching the ink containing body to the printing paper, comprising a platen which changes the ink color by rotating the ink containing sintered bodies; a drive device including a one directional clutch which sends the printing paper in a normal direction by clockwise rotation of a motor, and changes the colors by counterclockwise rotation; and a switching mechanism which connects the one directional clutch to bi-directions when the printing head is moved outside on available printing scope.

Abstract: In a printer which guides a printing paper between a printing head and a platen having ink containing bodies, and prints on said paper by pressure of the printing head; an attaching device for a platen body of the printer, wherein rotation control of the platen for changing ink color is made via a square shaft which is provided independently of a platen shaft having a rotatable, slidable plurality of bodies containing inks of different colors, and the platen is laterally moved via a supporter which slides along the square shaft, and the platen body comprising the platen and the platen shaft is structured independently of said rotation control and said lateral movement.