Abstract: Embroidery sewing machine having a Y-direction drive mechanism including an elongated arm which is normally accommodated in a cutout portion formed at a bed of the machine body and forms a part of that body. The upper side of the arm is continuous with the upper side of the bed in a same plane. The arm has a frame support to which an embroidery frame is removably attached, the frame holding a work to be embroidered. The arm is arranged as turnable to extend from the rear side of the bed into the depth direction (Y-direction) of the machine, where the arm is operative for embroidery stitching. The arm is connected to an X-direction drive mechanism arranged in the machine body and may be moved in the width direction (X-direction) of the machine body, by the X-direction drive mechanism while the embroidery frame is moved in the Y-direction along the arm.

Abstract: An embroidery sewing machine is described. The sewing machine has a Y-direction drive mechanism including an elongated arm 1 which is normally accommodated in a cutout portion 3 formed at a bed 90 of the machine body and forms a part of the machine body, wherein the upper side 10 of the elongated arm 1 is continuous with the upper side 91 of the bed 90 in a same plane. The elongated arm 1 has a frame support piece 19 to which an embroidery frame is removably attached, the embroidery frame holding a work to be embroidered. Further the elongated arm 1 is arranged as being turnable to extend from the rear side 93 of the bed 90 into the depth direction of the sewing machine, that is, in the Y direction where the elongated arm 1 is operative for embroidery stitching.

Abstract: Disclosed is the invention in connection with an electric sewing machine comprising a machine body 1 and a controller 2, wherein the controller 2 is responsive to a first press to produce a signal for starting the machine body 1 and is responsive to further press to produce a signal for driving the machine body 1 at a stitching speed (drive speed) in accordance with the pressing amount. The machine body 1 is provided with a control device 11 which is connected to a changing device 30 which is operated to change the control content of the control device 11. The changing device 30 may be operated to switch the control device 11 between being operative and being inoperative. In case the control device 11 is switched to being inoperative, the control device 11 neglects the instruction signal from the controller 2, for example, produces a stop signal to a motor drive device 12 in response to a machine drive signal from the controller 2, thereby to maintain the machine motor as stopped.

Abstract: Disclosed is the invention in connection with an electric sewing machine comprising a machine body 1 and a controller 2, wherein the controller 2 is responsive to a first press to produce a signal for starting the machine body 1 and is responsive to further press to produce a signal for driving the machine body 1 at a stitching speed (drive speed) in accordance with the pressing amount. The machine body 1 is provided with a control device 11 which is connected to a changing device 30 which is operated to change the control content of the control device 11. The changing device 30 may be operated to switch the control device 11 between being operative and being inoperative. In case the control device 11 is switched to being inoperative, the control device 11 neglects the instruction signal from the controller 2, for example, produces a stop signal to a motor drive device 12 in response to a machine drive signal from the controller 2, thereby to maintain the machine motor as stopped.

Abstract: Disclosed is a sewing machine having an indicating device for indicating selected patterns in a manner that the same may be substantially the same with the actually stitched result of the selected patterns, wherein the patterns selected by a user by operation of a pattern selecting/combining device 3 are indicated at an indicating device 8 and wherein in response to an optional combination or modification of the selected patterns, an image treating device 7 accordingly treats the image of the indicated patterns to indicate the same at the indicating device 8. The pattern data are stored in a pattern data memory 50 and a stitching mechanism 51 is operated in accordance with the pattern data stored in the pattern data memory 50, thereby to form the patterns of stitches.

Abstract: Disclosed is a sewing machine having an indicating device for indicating selected patterns in a manner that the same may be substantially the same with the actually stitched result of the selected patterns, wherein the patterns selected by a user by operation of a pattern selecting/combining device 3 are indicated at an indicating device 8 and wherein in response to an optional combination or modification of the selected patterns, an image treating device 7 accordingly treats the image of the indicated patterns to indicate the same at the indicating device 8. The pattern data are stored in a pattern data memory 50 and a stitching mechanism 51 is operated in accordance with the pattern data stored in the pattern data memory 50, thereby to form the patterns of stitches.

Abstract: A sewing machine and is connected to an external environment device having a display such that additional pattern information transmitted to the external environment device may be confirmed at the display irrespectively of internal and external information, the sewing machine having a memory for storing data which may be rewritten therein and an information input/output device for inputting and outputting external information into and from the memory such that the sewing machine may be operated under control of the external information while machine control information is outputted through the information input/output device.

Abstract: A sewing machine and the system thereof is disclosed, wherein a sewing machine is connected to an external environment means having a display such that additional pattern information transmitted to the external environment means may be confirmed at the display irrespectively of internal and external information, the sewing machine having a memory for storing data which may be rewritten therein and an information input/output means for inputting and outputting external information into and from the memory such that the sewing machine may be operated under control of the external information while machine control information is outputted through the information input/output means.

Abstract: An embroidery stitch data producing device with selective designation confirming functions is disclosed, wherein embroidery stitch data are produced from the image data obtained from an original image for defining the outlines and the blocks enclosed by the outlines with stitch conditions including stitch types and thread colors being designated. The outlines and the blocks so designated are classified and memorized.

Abstract: An embroidery stitch data producing device is disclosed, which is superior in its operating efficiency and is effectively operated to produce the stitch data for forming the stitches of an image to be embroidered, wherein the device is adapted to designate the parts of the image in accordance with the embroidering conditions including thread colors and other elements and being optionally determined. The designated parts of the image may be divided into a plurality of groups in dependence upon the determined embroidering conditions, and each of the groups are dealt with as a single unit. The stitch data are produced for each of the units in accordance with the determined embroidering conditions.

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: An embroidery stitch data producing device is disclosed, which is designed to display an embroidery pattern in a manner that the pattern is closest to the one that is to be embroidered. The device is provided with a scanner 51 or an image input means 2 for inputting colors therethrough. The color indicating data thus obtained and/or color indicating data stored in an image data memory 41 are registered to a color indication data registering means 22. More particularly the area of a display may be set for the background of an image to be embroidered before or after the image is displayed, or before or after the stitch conditions including thread colors are set.

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 load of an electronic sewing machine is self-diagonosed by a control system to cause a DC motor to be operated under control to drive upper and lower shafts of the sewing machine. The control system includes an evaluating device to which a voltage value applied to the DC motor and a rotating speed of the DC motor, both detected, are inputted for determining a current value supplied to the DC motor and a power loss of the DC motor. These data are supplied to a fuzzy inference unit for inferring an optimum rotating speed of the DC motor. A control command signal representing an excessive degree of the actual power loss in reference to the rated power loss is outputted from the fuzzy inference unit to the DC motor for the control of the electric power to be supplied thereto.

Abstract: A stitching pattern selecting device is disclosed which makes it possible to switch a plurality of patterns selectable among pattern groups displayed in a limited range at the front face of a sewing machine. The desired patterns are selected by scrolling large size indications of available patterns in succession so as to shorten the time for selecting the desired patterns, and select securely the patterns by a reverse white-black indication.

Abstract: There is disclosed a motor speed control system particularly applicable to control sewing machine operation, including an evaluator to compare a preset speed of revolution value and an actual speed of revolution value to output one signal representing a deviation between the two speeds and the other representing a rate of increase or decrease of the actual speed of revolution within a predetermined short interval. In response to these parameter signals, one of the stored fuzzy rules is selectively applied to output an appropriate control signal to change electric power supplied to a motor as needed to adjust the speed of revolution toward the preset revolution with quick responsivity and smooth transition.

Abstract: In a four-phase stepping motor driving apparatus phase-A and phase-A, or phase-B and phase-B are prevented from simultaneously becoming conductive. A device for this includes a change-over circuit which validates either of the phase-A and the phase-A, a change-over circuit which validates either of the phase-B and the phase-B, a change-over circuit which renders both the phase-A and the phase-A conductive or nonconductive and a change-over circuit which rendered both the phase-B and the phase-B conductive or nonconductive.

Abstract: A load of an electronic sewing machine is self-diagnosed by a control system to cause a DC motor to be operated under control to drive upper and lower shafts of the sewing machine. The control system includes an evaluating device to which a voltage value applied to the DC motor and a rotating speed of the DC motor, both detected, are inputted for determining a current value supplied to the DC motor and a power loss of the DC motor. These data are supplied to a fuzzy theory applying device for estimating if the power loss of the DC motor exceeds a rated value by application of a prescribed fuzzy rule. A control command signal representing an amount of the excessive power loss is outputted from the fuzzy theory applying device to the DC motor for the control of the applied voltage. No need to directly measure the current value, and therefore no need to provide a current detecting resistor in a control circuit.

Abstract: A control system is provided for stopping a sewing machine needle at a predetermined position within its reciprocating path. An upper drive shaft rotating at a given rotational speed tends to decrease towards a predetermined lower rotational speed, responsive to a stop command signal. An electric motor is deenergized once the rotational speed reaches the predetermined value, and after that the upper drive shaft continues to rotate by inertia. A pulse number to be generated during the inertia rotation will be determined by an inclination of decrease of rotational speed. Another pulse number to be generated during a period when the stop command signal is generated and when the upper drive shaft rotational speed reaches the predetermined value is determined by application of a selective one or combination of prescribed fuzzy rules, so that the upper drive shaft will come to a standstill at a predetermined position or rotational angle, which governs the predetermined position of the needle.

Abstract: An amount of a lower thread to be supplied from a bobbin in each stitch forming operation is first determined on a theoretical basis in accordance with the stitch control data stored in a pattern memory. The sewing machine is provided with a bobbin rotation detector which detects every rotation of the bobbin to estimate a lower thread amount which has actually been supplied from the bobbin. A control unit compares the theoretical amount and the practical amount to lead out a correction coefficient which will be applied to the theoretical amount for the next stitch forming operation.