Abstract: A sewing machine includes a feed amount setting part and a feed amount adjustment part. In the feed amount setting part, a forward feed amount for one stitch of forward stitching is set. In the feed amount adjustment part, the forward feed amount which is set by the feed amount setting part is compared with the maximum backward feed amount for one stitch of reverse stitching which is determined by a feed mechanism. Then, in the feed amount adjustment part, when the forward feed amount is larger than the maximum backward feed amount, the total amount of backward feed amounts for plural stitches of backward stitching is adjusted so as to coincide with the total amount of the forward feed amounts for one stitch or more of forward stitching.

Abstract: A direct drive cloth feeding mechanism of a sewing machine includes a cloth feeding structure, a vertical driving structure and a direction adjustment structure. The cloth feeding structure includes a swing shaft and a cloth feeding teeth member. The vertical driving structure includes an eccentric shaft connected to the cloth feeding teeth member, and an eccentric cam disposed on the eccentric shaft. The direction adjustment structure includes a stepping motor, and a rotating shaft driven by the stepping motor to rotate and switch between a first position and a second position. When the stepping motor directly drives the rotating shaft to the first position, the cloth feeding teeth member performs a forward feeding process. When the stepping motor directly drives the rotating shaft to the second position, the cloth feeding teeth member performs a reverse feeding process.

Abstract: A direct drive cloth feeding mechanism of a sewing machine includes a cloth feeding structure, a vertical driving structure and a direction adjustment structure. The cloth feeding structure includes a swing shaft and a cloth feeding teeth member. The vertical driving structure includes an eccentric shaft connected to the cloth feeding teeth member, and an eccentric cam disposed on the eccentric shaft. The direction adjustment structure includes a stepping motor, and a rotating shaft driven by the stepping motor to rotate and switch between a first position and a second position. When the stepping motor directly drives the rotating shaft to the first position, the cloth feeding teeth member performs a forward feeding process. When the stepping motor directly drives the rotating shaft to the second position, the cloth feeding teeth member performs a reverse feeding process.

Abstract: A method for the plasma electrolytic oxidation of a bioactive coating onto implant (4) is provided. The implant is placed in an electrolyte solution (3) providing Ca and P ions and then connected to a power supply (1). A counter electrode is also provided in the electrolyte solution. A sequence of voltage pulses having alternating polarity are then applied across the implant and counter electrode to deposit a bioactive coating onto the implant. A intra-bone implant formed by the method is also provided having a coating with a thickness of 10 to 30 microns, a porosity comprised by pores with sizes of 0.5 to 10 microns, and comprising 10 to 30 wt % of hydroxyapatites.

Abstract: A guiding structure for a cloth feeding mechanism which is disposed on a base below a needle plate of a sewing machine, a feeding dog driven by the cloth feeding mechanism is mounted on a mounting seat. The guiding structure comprising a first guiding portion formed on the mounting seat and a second guiding portion formed on a guiding device, the first and second guiding portions cooperate with each other to guide the feeding dog to move in the X-axis direction, so that the cloth can be fed precisely along the predetermined path to ensure good sewing quality.

Abstract: A method for transferring an embroidery frame backward in case of thread breakage, includes the steps of: a) detecting the thread breakage to generate a thread breakage signal if the thread breakage occurs at a needle contained in needle holders; b) generating the control signal to control an embroidery-frame driver in response to the thread breakage signal; and c) transferring the embroidery frame backward in response to the control signal.

Abstract: A sewing machine capable of tracing an embroidery area by relatively moving a needle bar as a sewing device and an embroidery frame which holds a work cloth on which an embroidery pattern is embroidered based on embroidery data, comprises a calculating device that calculates a convex polygon in multiples of eight covering the pattern inside from the embroidery data, and positions of a plurality of vertexes comprised of the convex polygon, and a trace device that traces the embroidery area based on the vertexes found by the calculating device.

Abstract: A fabric feed direction reversing device for a sewing machine having a reversing mechanism that switches a sewing object feed direction includes a control means that stops a needle at an upper position or a lower position by controlling a sewing machine drive motor based on a sewing object feed direction reversing command generated from a feed reverse command section, and that operates the reversing mechanism after the needle has stopped, and that operates the sewing machine drive motor after the reversing mechanism operation has been completed.

Abstract: A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.

Abstract: A mask sewing device comprises a pair of sewing machines which are fixed to a working table, being arranged left and right thereon in such a way as to face each other, and are operated in synchronism with each other, a pair of belts provided apart from each other on the working table by a given interval, each belt extending between the mask cloth feeding side and mask cloth sending-out side of the working table and a feeding unit for driving the belts in the normal and reverse directions, wherein the sewing machines can concurrently sew the folded end portions of the mask cloth at both sides thereof respectively, the mask cloth being inserted into the interval from the feeding side.

Abstract: A sewing machine is provided with an automatic anti-loosening-stitcher mode selector switch for activating and deactivating the anti-loosening-stitcher mode in which anti-loosening-stitches are formed after the completion of a stitch pattern, and an automatic thread-cutter mode selector switch for activating and deactivating the thread-cutter mode in which threads are cut after the completion of a stitch pattern. When only the automatic thread-cutter mode selector switch is operated to set the thread-cutter activated mode, a CPU sets automatically both the anti-loosening-stitcher activated mode and the thread-cutter activated mode to form anti-loosening-stitches after the completion of a stitch pattern before cutting the threads so that stitches forming the end portion of the stitch pattern are prevented from loosening.

Abstract: A sewing machine including a shuttle/hook & bobbin assembly reciprocated to carry an under thread for making stitches with an upper thread on a workpiece, a stroke-adjustable feed mechanism controlled by a micro-inch stitch adjusting device to feed the workpiece in either direction or to let the workpiece be retained in place during stitching. The major parts of the sewing machine are respectively molded from ABS (acrylonitrile-butadiene-styrene) so that the weight as well as the manufacturing cost of the sewing machine are relatively reduced.

Abstract: A feed regulator of a sewing machine capable of varying a seam length at the stitching operation employs a first driving device for swingably driving a feed regulating table by way of a link mechanism so that a feed dog can switch the feed direction, whereby a reverse stitching operation can be performed in the same way as the conventional feed regulator. The feed regulator also employs a link mechanism having one surface for retaining the projection of the link member having a slit, one surface of which can retain the projection of the link mechanism, and a second driving device for driving the link member, whereby the reverse stitching operation can be performed by second driving device in the arbitrary seam length.

Abstract: A processing and sewing machine arrangement for preparing a seam which is uninterrupted on a seam side facing the needle of the sewing machine. The arrangement includes a shuttle thread disturbance detection arrangement and a control arrangement activating a stopping arrangement for stopping the sewing machine after the shuttle thread disturbance has been detected and after a stitch formation cycle which has been begun is completed. A regulating mechanism for setting stitch length is set into a reverse stitching mode by the control arrangement while the fabric being sewn is moved backward by one stitch length. After the shuttle thread has been fed in, thread is knotted by at least one stitch with the needle thread in the same insertion hole in which the old shuttle thread is located such that the old shuttle thread is correctly knotted with the needle thread.

Abstract: Wheel low fabric feeding for sewing machines where oscillations of the feeding shaft are transmitted to two gear couples mounted on free release wheels fixed to a support pivoted free to rotate. By acting on a stitch length regulator device one of these couples engages the feeding wheel for reversing the rotation direction of the wheel and thus the work feeding direction.

Abstract: A zigzag sewing machine comprises a pattern data memory, a fixing stitch memory, a read-out unit, a controller, a determination unit, a switch-over mechanism and a stitch forming mechanism. The read-out unit reads out pattern stitch data from the pattern data memory means. Based on the read-out stich pattern data, the controller controls the stitch forming mechanism to form a pattern on a fabric. If a repeat sewing mode is selected, the controller repeatedly sews the pattern. Meanwhile, the determination unit determines if a given pattern whose sewing is in progress is a predetermined last pattern or a pattern which was not initially designated as a last pattern but was later redesignated as a last pattern by mode switching.

Abstract: A feeding adjusting dial has at an inner circumferential surface thereof a plurality of teeth fixed to a stopper defined in the body of an arm of the sewing machine at both sides of the feeding rate adjusting shaft meshes with one of the plurality of teeth of the feeding rate adjusting dial. The feeding rate adjusting shaft is screwed into the body of the arm at a portion thereof and has a tip end thereof brought into contact with a cam surface of a feeding adjusting cam. The feeding adjusting cam is connected to a feeding adjusting table via a link. The feeding rate adjusting shaft comprises a first member, a second member and an elastic coupling for connecting the first and second members. One of the first and second members is screwed into the body of the arm of the sewing machine.

Abstract: By means of this method and apparatus for sewing a seam, it is possible to end a seam exactly at a predetermined location. When the predetermined location is reached, the forward movement of the sewing material is interrupted, and only the stitch that had been begun at the time of the interruption is completed. In this way, on the one hand, visually attractive seams can be produced and, on the other hand, it is possible to sew a small part onto a main part with a seam which does not extend past the small part.

Abstract: A sewing machine and a method of controlling operation of the same wherein reading out of a selected finish-up stitch pattern is effected substantially simultaneously with generation of rotation speed reduction signal when an actual rotation speed of the machine is lower than the reference rotation speed, and when a rotation speed is reduced to the reference rotation speed upon the actual speed of the machine being higher than the reference rotation speed.

Abstract: A sewing machine employs stepper motor actuated control for magnitude and direction of work feed including operator influenced feed balancing cam apparatus for shifting the stepper motor actuated control axially relative to or with a stepper motor shaft in order to attain parity between forward and reverse directions of work feed.

Abstract: A sewing machine with a pair of feed wheels which clamp a workpiece therebetween to transport the workpiece, the sewing machine comprising first and second feed shafts each of which have a clutch portion at an end thereof in opposition to each other and a group of gears disposed between these feed shafts for rotating the second shaft in the direction reverse to the rotational direction of the first shaft. The direction of transportation of the workpiece is changed by means of a clutch having a portion which selectively contacts the clutch portion of either the first or second feed wheel.

Abstract: A zigzag sewing machine capable of forming a plurality of back stitches before or after forming a pattern. When a specific pattern for over-casting is selected and the needle is jogged to a position corresponding to the right end position of the selected pattern, back stitches are formed after the needle has been jogged to the left in response to the operation of a back stitch control member.

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 sewing machine control device including a sewing machine head with a feed reversing mechanism, a position detector for detecting the position of a needle of the sewing machine head, a stitching setting mechanism for instructing the number of stitches for reverse stitching, and a reverse stitching control section for controlling the feed reversing mechanism. Sewing machine operating speed data is applied to the control section, and according to the sewing machine operating speed data thus applied, the timing of instructing the driving of the feed reversing mechanism is automatically varied. Thus, the time instant when the number of stitches actually sewed reaches the instructed number of stitches is made to coincide with the time instant when the feed reversing mechanism is actually operated.

Abstract: A sewing machine control device in which a solenoid is used to reverse sewing directions after a selected number of stitches. The temperature of the solenoid is measured and the energization or deenergization of the solenoid is advanced to account for the thermally increased time constant of the solenoid.

Abstract: In a sewing machine with a feed device which comprises a feed wheel arranged next to a stitch formation point, driven synchronously with stitch formation tools, and mounted in a support provided at the housing of the sewing machine, in order to obtain an extremely exact drive in both directions, the feed wheel is placed in driving connection with a step motor. In a manner known in itself, the step motor receives stepping pulses which can be generated by a pulse generator operating synchronously with a main shaft of the machine and via a counting device that determines the feed amount. This feed amount is presettable by selectable digital data contained in a memory. In an arrangement wherein the feed wheel is connected to its drive via a deflection gearing and a transmission shaft mounted in the support, the deflection gearing consists of a ring gear attached to the feed wheel and of a pinion firmly connected to the transmission shaft.

Abstract: In backward progress of straight stitching, stitches are conformed to either a perfect stitch or a hitch stitch without causing mixture of them, and while a needle is turned at a determined one of a right line or a left one from a basic line just before the needle drops on the basic line of a straight stitching, a condition of the thread to penetration of the needle is regulated before the needle dropping, whereby the stitch forming conditions are made uniform, so that satisfactory stitches are formed without requiring any special processes to the stitch forming mechanism members.

Abstract: A device for stabilizing stitches in a sewing machine comprises a feed adjuster and a transmission mechanism imparting a turning movement to the needle in the plane normal to the elongation of the needle such that uniform and stable stitches are made in forward stitching and in backward stitching as well.

Abstract: In an electronically controlled sewing machine having a memory storing a plurality of stitch patterns among which a desired one or combination may be selectively read out therefrom to produce the same, it is detected if a pattern designated to be followed by a lock stitch pattern and memorized accordingly in the memory is of a first type which includes the last stitch to be produced by initial data stored in the memory for producing the initial stitch of the pattern, or of a second type which includes the last stitch to be produced by the last data stored in the memory for producing the last stitch of the pattern, and according to the result of the detection, the sewing machine is operated to continuously produce the lock stitch pattern after the initial data has been issued from the memory for producing the pattern of the first type or after the last data has been issued from the memory for producing the pattern of the second type.

Abstract: A control device for a sewing machine, in which the numbers of stitches in forward and backward feed of an article to be sewed are preset, comprises: a reverse-stitching electromagnetic operating unit for reversing the direction of feed of the article; a control unit for applying instruction signals to the electromagnetic operation unit to control the latter; and delay means for controlling the operation delay time between the turning "on" or "off" of the electrical instruction signal which is applied to the electromagnetic operating unit by the control means and the turning "on" or "off" of the electromagnetic operating unit. The time instant that the instruction signal is turned "on" or "off" by the control means is caused to occur a period of time, corresponding to the operation delay time, earlier than a predetermined time instant, so that the number of stitches preset is equal to the number of stitches actually formed.

Abstract: A manually operable input control member is mounted in a sewing machine for linear movement into a reverse feed controlling position and for pivotal movement therefrom into a reverse feed sustaining position wherein the member is held against a spring which is provided to bias it toward an unactuated hands off position in the machine.

Abstract: Arrangement for forming patterns made up of stitches in an electronic sewing machine includes a static memory comprised of a plurality of storage units, stitch forming means operatively connected to the outputs of the storage units for producing any of different stitches in dependance from the signals produced at the outputs of the memory, addressing means including an addressing counter, synchronizing means, and manually operated back stitching means including an address memory operative to cause the addressing counter to count down the storage units of the static memory.

Abstract: In an automatic sewing apparatus, a relay controlled by a backstitch control switch de-energizes a presser foot solenoid to raise the presser foot during backstitching to prevent damage that would result from the presser foot striking a pallet holding a workpiece. A switch, adapted to be actuated by the pallet, disables the operation of the sewing apparatus until the pallet is in a predetermined aligned position with respect to a support carriage which moves the pallet in a predetermined pattern with respect to the sewing head.

Abstract: A stitch length and reversing control for a sewing machine is uniquely arranged to facilitate the selection by a machine operator of the length of stitches to be formed in a work piece, to enable the operator at a convenient location on the machine to quickly reverse the direction in which work is fed from a forward feeding direction to a reverse feeding direction, and to enable the operator to sustain the operation of the machine in a reverse feed mode with hands off the control.

Abstract: A sewing machine wherein a single operable button is capable of selectively performing a plurality of actions depending on the length of duration of the operation time. The machine is provided with a needle positioning device for arresting the needle at a certain predetermined position and a stitch forming system for forming a specific stitch pattern, and either of the two is actuated according to the length of duration of the operation time of the operable button. Furthermore, a forthcoming action of the machine can be varied in response not only to the length of duration of the operation time mentioned above but also to the state of the machine which can be in operation or stationary. The machine is thereby capable of performing a plurality of different actions by means of fewer operable buttons.

Abstract: Arrangement for forming patterns made up of stitches in an electronic sewing machine includes a static memory comprised of a plurality of storage units, stitch forming means operatively connected to the outputs of the storage units for producing any of different stitches in dependance from the signals produced at the outputs of the memory, addressing means for applying to the address signal inputs of the memory next-address signals derived from the signals produced at the outputs of the memory, synchronizing means for activating the addressing means synchroniously to operation of the stitch-forming means and back-stitching means for changing the next-address signals in accordance to the required back stitches.

Abstract: An adjunct control system for electronically controllable sewing machines which increases the flexibility of the sewing system by providing the functions of mechanically programmable stitch counting for each of a predetermined number of stitching sequences, programmable needle positioning, reverse stitching, thread trimming and wiping, and manually selected program interruption for selected conditions. A micro-processor auxiliary control system is utilized which is interfaced with a standard commercially available sewing machine control system in such manner that the sewing machine may be used in either its standard mode of operation without the micro-processor control, or may be used under micro-processor control. The micro-processor includes a central processing unit, a program memory, read/write storage, a control decoder and input/output devices for accessing the CPU and for interchanging control signals between the micro-processor and the standard sewing machine control system.

Abstract: A feed regulator means having both manual stitch length control and pattern cam control of the work feeding mechanism of a sewing machine. A feed regulator crank secured to a feed regulator shaft is the driven link of a four bar linkage system. A manually operable camming device is operably engaged with the four bar linkage for stitch length selection and for simultaneously establishing the proportionate amount of motion transmitted from a pattern cam, which is also operably engaged with the four bar linkage, to said feed regulator shaft. A proportional link is in operable engagement with said four bar linkage such that the stitch length selection of the camming device may be altered without effecting angular movement of said feed regulator crank when a portion of the pattern cam is being tracked which dictates a zero stitch length.

Abstract: A control system for a sewing machine includes at least an impulse generating circuit and a counter means connected thereto. A shift register having at least four bits and a mode selecting circuit connected thereto is provided. A circuit for feeding the work material or fabric forwards, a circuit for feeding the work material backwards, and a circuit for resetting these circuits are provided. The system is:(1) capable of selecting, in advance, the number of stitches in a single forward and backward reciprocal non-ravel seaming;(2) capable of doing a desired number of the repeated non-ravel seaming on a certain place (repeated reciprocal non-ravel seaming mode); and(3) capable of free selecting between the conventional non-ravel seaming mode and the above-mentioned repeated non-ravel seaming mode (the free mode selection).

Abstract: A mechanism for a sewing machine for enabling the manual or automatic control of the direction and of the amplitude of movement of a transporting claw guide for material to be sewn. The mechanism is driven from the main driving shaft of the sewing machine via a cam and a series of intermediate lever members connected to a rotatable shaft connected to the transporting claw guide. The control is automatically accomplished by means of a cam driven from the main driving shaft of the machine via the arrangement of levers to obtain back-and-forth movement of the claw guide or, when a cam follower is disengaged from the cam, the control can be accomplished manually without the automatic back-and-forth movement.

Abstract: A high speed electronically controlled industrial sewing machine having an automatic back-tack capability is disclosed. To achieve balanced stitching in the first and last tacks of a seam while still operating at high speed, the stitches in the tacks are counted and additionally a fixed time delay is provided in the feed reversal command circuitry to compensate for system inertias which result in response time delays of the sewing machine to the feed reversal command signals.

Abstract: A dual mode backtack control system for a sewing machine is disclosed which permits an operator to select either a latched or non-latched backtacking mode of operation utilizing a single non-latching switch. The backtacking operation is initiated under operator command by closure of the switch. In the first mode of operation, the sewing machine is operating when the switch is closed, and the backtacking operation will continue only as long as the switch is held in the closed position. In the second mode of operation, the switch is closed before the machine commences the sewing operation, and the machine may then be operated in its backtacking mode without the operator maintaining the switch in its closed state. The backtacking mode may thereafter be terminated by a second momentary closure of the switch. An indicator lamp is provided to advise the operator when the machine is in the backtack mode.