Abstract: An example method includes determining, by a computing system, a dry thickness of a fabric preform. The method also includes determining, by the computing system, a debulked thickness of the fabric preform using the dry thickness of the fabric preform. In addition, the method includes determining, by the computing system, a stitch tension using the dry thickness of the fabric preform and the debulked thickness of the fabric preform. And the method includes causing, by the computing system, a stitching machine to apply a through-the-thickness stitch having the stitch tension to the fabric preform.

Abstract: A knee operated lifting mechanism for a presser foot of a sewing machine is fixed on a body of the sewing machine, the body is provided with a presser-foot shaft, the knee operated lifting mechanism is drivingly connected to the presser-foot shaft, so as to consequently drive the presser foot to move up and down. The knee operated lifting mechanism includes a knee pushing device, a cable and a rotary member. The knee pushing device includes a knee pushing plate to be operated by a user. The cable is drivingly connected to the knee pushing plate to control the rotation of a drive shaft and the rotation of the presser-foot shaft as well, which consequently controls the upward and downward motion of the presser foot, and thus considerably simplifying the structure of the knee operated lifting mechanism.

Abstract: When lifting and lowering the presser-foot by either of the manual operation lever and the knee operation lifter, the composition of the lifting and lowering mechanism can be simplified, the number of parts can be reduced and the production can be performed easily. The present invention is provided with a presser bar lifting and lowering mechanism (30) which has: a lifter operating plate which is disposed upon a pedestal (2a) which supports an arm (2) upon a bed (3) and which is vertically movable depending on a vertical movement operation of a manual operation lever (31); a pivot rod in which one end is joined to the lifter operating plate via a first joining link; and a presser-foot bar lifting and lowering plate which is joined to a second joining link which is joined to the other end of the pivot rod, and which is joined to the presser-foot bar via a presser bar holder which is fixed to the presser-foot bar.

Abstract: A motor control device is used to control an electric motor that drives a presser mechanism of a sewing machine and includes a knee lever mechanism and a control module. The knee lever mechanism includes a switch component, an actuator rotatable to actuate the switch component at a predetermined angular position, and a rotatable knee lever operable by knee contact to rotate and to drive rotation of the actuator. When the control module determines that the switch component is actuated, the control module controls the electric motor to move the presser mechanism to dispose a presser foot of the presser mechanism at a predetermined height relative to a bed of the sewing machine.

Abstract: The invention relates to a mechanically operated presser foot lift arrangement (2) comprising a presser bar (14) with a presser foot (15) and a presser foot lift (16) having a body (17) and a handle (18). The body (18) comprises a guiding means (21). An actuating means (23) connected to the presser bar is arranged to be guided along the guiding means on rotation of the body about a shaft (19). The guiding means cooperates with a first locking means (26) for locking the actuating means in a position corresponding to a first lifting height of the presser bar. The arrangement comprises also a displaceable means (27) having a second locking means (28), which may be brought into and out of cooperation with the guiding means. When positioned in cooperation with the guiding means, the second locking means is arranged for locking the actuating means in a position corresponding to a second lifting height of the presser bar.

Abstract: A sewing machine hopping foot assembly having a hopping foot which has a hopping foot top with a hopping foot needle bar opening, a hopping foot base with a hopping foot base opening, and one or more hopping foot arms connecting the hopping foot top to the hopping foot base, having a hopping foot bushing with an interior annular space, the hopping foot bushing being connected to the hopping foot, the annular space providing for a normal up and down sewing movement of the needle bar in the annular space.

Abstract: A sewing machine hopping foot assembly having a hopping foot which has a hopping foot top with a hopping foot needle bar opening, a hopping foot base with a hopping foot base opening, and one or more hopping foot arms connecting the hopping foot top to the hopping foot base, having a hopping foot bushing with an interior annular space, the hopping foot bushing being connected to the hopping foot, the annular space providing for a normal up and down sewing movement of the needle bar in the annular space.

Abstract: A presser device for a sewing machine is disclosed. The presser device includes a presser bar; a presser foot provided at a lower end of the presser bar; a presser spring elastically biasing the presser foot downward; a presser-foot lifting lever moved between a lifted position and a lowered position for lifting/lowering of the presser foot; a speed restraining element producing resistance capable of slowing down the movement of the lever; and a speed-restraint switch mechanism that slows down the movement of the presser-foot lifting lever by allowing the speed restraining element to produce the resistance when the presser-foot lifting lever is moved from the lifted position to the lowered position, and that does not slow down the movement of the presser-foot lifting lever by not allowing the speed restraining element to produce the resistance when the presser-foot lifting lever is moved from the lowered position to the lifted position.

Abstract: A sewing machine includes a main body, a presser bar attached to the main body so as to move along a vertical direction of the sewing machine and detachably holding a presser foot, a needle thread tension adjustment mechanism selectively brought into inactive and active modes, the needle thread tension adjustment mechanism releasing a needle thread tension in the inactive mode and maintaining the needle thread tension in the active mode, and a presser bar lifting lever manually rotated along the vertical direction by a user of the sewing machine and adjusting a position of the presser bar in the vertical direction in accordance with the manual rotation, the presser bar lifting lever including a height adjustment cam portion adjusting the position of the presser bar in the vertical direction and a thread tension adjustment cam portion allowing the needle thread tension adjustment mechanism to adjust the needle thread tension.

Abstract: The invention relates to a mechanically operated presser foot lift arrangement (2) comprising a presser bar (14) with a presser foot (15) and a presser foot lift (16) having a body (17) and a handle (18). The body (18) comprises a guiding means (21). An actuating means (23) connected to the presser bar is arranged to be guided along the guiding means on rotation of the body about a shaft (19). The guiding means cooperates with a first locking means (26) for locking the actuating means in a position corresponding to a first lifting height of the presser bar. The arrangement comprises also a displaceable means (27) having a second locking means (28), which may be brought into and out of cooperation with the guiding means. When positioned in cooperation with the guiding means, the second locking means is arranged for locking the actuating means in a position corresponding to a second lifting height of the presser bar.

Abstract: A presser foot device for a sewing machine includes a presser bar mounted on a head provided at a distal end of an arm and having a lower end having a presser foot, the presser foot device lifting the presser foot upward and downward together with the presser bar, the presser foot device further including a first shaft, a support unit configured to support the first shaft, and a presser foot lifting lever configured to move the presser foot upward and downward, the presser foot lifting lever being rotatably connected to the support unit by the first shaft. The support unit is rotatable between a first position where the presser foot lifting lever is located below the arm of the sewing machine and a second position where the presser foot lifting lever is located behind the head of the sewing machine.

Abstract: A sewing machine includes a needle, a needle bar which supports the needle, an upper feeding foot operable to feed the workpiece interlockingly with an up and down movement of the needle bar, a presser foot operable to press the workpiece, a holding bar which supports the presser foot, an actuator including an operating member operable to be changed to a first state, a second state or a no-load state, and a connecting portion which couples the operating member and the holding bar. The holding bar is constantly biased downward by a biasing force. The actuator moves the presser foot up against the first biasing force when the operating member is in the first state, and moves the presser foot down when the operating member is in the second state.

Abstract: A cloth pressing device of a sewing machine is provided. The cloth pressing device includes a presser bar, a presser foot rotatably coupled to a lower end portion of the presser bar, an elastic member having a base end portion which is supported by the presser bar and a tip end portion which is engageable with a tip side portion of the presser foot to downwardly bias the tip side portion of the presser foot, and an adjusting mechanism operable to move the tip end portion of the elastic member between a position at which the tip end portion of the elastic member engages with the tip side portion of the presser foot and another position at which the tip end portion of the elastic member does not engage with the tip side portion of the presser foot.

Abstract: A sewing machine comprising: vertical movement actuator that vertically moves the presser bar having a presser foot; a control unit, that controls the vertical movement actuator to selectively execute a first mode or a second mode; a mode switch unit capable of selectively switching between the first mode and the second mode; and the control unit, when switched to the first mode, controls the vertical movement actuator so as to retain the presser foot at a cloth pressing position irrespective of an operational status of a sewing process; and when switched to the second mode, controls the vertical movement actuator so as to retain the presser foot in a slightly lifted position while a sewing operation is ongoing, whereas when the sewing operation is stopped, the presser foot is moved and retained in the cloth pressing position.

Abstract: A knee lever a lever including a lever detachably attached to an attachment provided on a bed of a sewing machine; a knee rest mounted on the lever and operated by knee contact, with the lever being attached to the attachment; an adjustment mechanism allowing adjustment in position of knee contact of the knee rest; wherein the adjustment mechanism includes an engagement portion provided at the lever, and an engagement subject provided at the knee rest and being disengagably engaged with the engagement portion to switch a mounting position of the knee rest relative to the lever.

Abstract: A pressure adjustment structure for a presser foot of a sewing machine, wherein one end of a horizontal arm of the sewing machine is disposed with a presser bar of the presser foot, and an elastic member is mounted on the presser bar. The end of the horizontal arm is provided with a main supporting frame, so that the pressing member slides on the main supporting frame with a pressing body and a guiding member, and one end of the pressing member presses an elastic member. In addition, the pressing body extends towards and is driven by an adjustment element of the main supporting frame, so that the pressing member driven by the pressing body slides on the main supporting frame to press the elastic member so as to provide different pressure. A second supporting frame is disposed on the main supporting frame to connect with the horizontal arm.

Abstract: A presser device for a sewing machine includes a first lever having a cloth pressing portion which is swingably mounted on a presser foot, the cloth pressing portion being swung so as to be switchable between a cloth pressing position and a raised position, a second lever having a support portion where the second lever is pivotally supported on an upper part of the first lever and an abutment which is normally in abutment with a needlebar assembly moved up and down, a first biasing member which biases the first lever so that the first lever is caused to pivot in such a direction that the cloth pressing portion becomes a cloth pressing position, and a second biasing member which biases the second lever so that the second lever is caused to pivot in such a direction that the abutment of the second lever is abutted against the needlebar assembly.

Abstract: Disclosure relates to a presser foot device for a sewing machine which includes a presser bar mounted on a head mounted at a distal end of an arm and having a lower end with a presser foot, the presser foot device lifting the presser foot upward and downward together with the presser bar. The presser foot device includes a presser foot lifting lever mounted for lifting the presser foot upward and downward and a support unit which supports the presser foot lifting lever so that the presser foot lifting lever is switchable between a first position that is located below the arm of the sewing machine and a second position that is located behind the head of the sewing machine.

Abstract: A cloth pressing device of a sewing machine is provided. The cloth pressing device includes a presser bar, a presser foot rotatably coupled to a lower end portion of the presser bar, an elastic member having a base end portion which is supported by the presser bar and a tip end portion which is engageable with a tip side portion of the presser foot to downwardly bias the tip side portion of the presser foot, and an adjusting mechanism operable to move the tip end portion of the elastic member between a position at which the tip end portion of the elastic member engages with the tip side portion of the presser foot and another position at which the tip end portion of the elastic member does not engage with the tip side portion of the presser foot.

Abstract: Sewing machine includes a needle bar that is vertically moved to perform a sewing operation, a fabric holder supported on the needle bar in such a manner that the fabric holder is vertically movable relative to the needle bar, and an urging member for normally urging downward the fabric holder on the needle bar. The sewing machine further includes a position restricting member for mechanically restricting a position of the fabric holder to prevent unwanted upward movement of the fabric holder having reached a lower dead point along with the vertical movement of the needle bar.

Abstract: A presser device for a sewing machine includes a first lever having a cloth pressing portion which is swingably mounted on a presser foot, the cloth pressing portion being swung so as to be switchable between a cloth pressing position and a raised position, a second lever having a support portion where the second lever is pivotally supported on an upper part of the first lever and an abutment which is normally in abutment with a needlebar assembly moved up and down, a first biasing member which biases the first lever so that the first lever is caused to pivot in such a direction that the cloth pressing portion becomes a cloth pressing position, and a second biasing member which biases the second lever so that the second lever is caused to pivot in such a direction that the abutment of the second lever is abutted against the needlebar assembly.

Abstract: A presser foot lifting lever for a sewing machine includes a lever body rotatably supported about a horizontal shaft center by a head; a handle operated by the user; and a connecting portion connecting the handle to the lever body. The connecting portion allows the handle to be switched relative to the lever body between a predetermined active position taken to allow user operation and a predetermined retracted position taken when not in use.

Abstract: A presser foot lifting lever for a sewing machine includes a lever body rotatably supported about a horizontal shaft center by a head; a handle operated by the user; and a connecting portion connecting the handle to the lever body. The connecting portion allows the handle to be switched relative to the lever body between a predetermined active position taken to allow user operation and a predetermined retracted position taken when not in use.

Abstract: A sewing machine includes a needle, a needle bar which supports the needle, an upper feeding foot operable to feed the workpiece interlockingly with an up and down movement of the needle bar, a presser foot operable to press the workpiece, a holding bar which supports the presser foot, an actuator including an operating member operable to be changed to a first state, a second state or a no-load state, and a connecting portion which couples the operating member and the holding bar. The holding bar is constantly biased downward by a biasing force. The actuator moves the presser foot up against the first biasing force when the operating member is in the first state, and moves the presser foot down when the operating member is in the second state.

Abstract: A two-needle overlock sewing machine comprises a throat plate and a middle tongue. The throat plate has an opening needle hole and an outer tongue. The middle tongue is disposed parallel to the outer tongue, a thread chain is formed so as to envelop both tongues. The presser foot is disposed so as to press the cloth to the throat plate by a spring. A push-up lever lifts up the presser foot by handling. The push-up lever and the middle tongue are coupled together by a transmission mechanism. By raising the presser foot by manipulation of the push-up lever at the finish of sewing operation, the middle tongue draws back simultaneously and retreats from the needle hole. As a result, the manipulation for drawing back the middle tongue during the process of thread chain handling is not needed, and the operation is simplified.

Abstract: The invention relates to a device for adjusting a checking unit of a presser foot, used in a sewing or embroidery machine. A needle bar moves the presser foot towards a needle plate, using a spring which is connected in series. The checking unit intercepts the presser foot using a checking element of the unit, before contact is made with the work piece to be sewn and controls the movement of the presser foot until the latter touches the work piece. The checking element and the needle bar are both operated by a common drive and the bedding position of the checking element can be modified in relation to the needle plate.

Abstract: A sewing machine is disclosed, wherein a downward pressure normally applied to the presser bar may be optionally adjusted in response to a selected pattern of stitches, and further may be reduced when the presser bar is lifted from the lower operative position to the upper inoperative position, and the operation may be performed smoothly and efficiently.

Abstract: A sewing machine with a work pressing bar positioning device is disclosed, the sewing machine substantially comprising a work pressing bar holding mechanism including an upper holder movable axially of a work pressing bar and a lower holder fixedly connected to the work pressing bar, spring means including a compression spring having a force for normally pressing down the upper holder axially of the work pressing bar, a height changing mechanism including a guide member which is operated to move between a first position laterally close to the work pressing bar and a second position laterally away from the work pressing bar and a transmission mechanism operated in response to operation of the guide member to operate the work pressing bar holding mechanism, the transmission mechanism including upper and lower links which are operatively connected to each other and to the guide member while the upper link has one end operatively connected to the upper holder and the lower link has one end operatively connected t

Abstract: A sewing machine is disclosed, wherein a downward pressure normally applied to the presser bar may be optionally adjusted in response to a selected pattern of stitches, and further may be reduced when the presser bar is lifted from the lower operative position to the upper inoperative position, and the operation may be performed smoothly and efficiently.

Abstract: A sewing machine is provided with a presser foot mechanism having a pressure bar and a presser foot, and with a linear motor (20) as an adjusting element. The linear motor (20) is arranged at least partially in the arm (2) of the machine housing and the drive bar (19) of the linear motor (20) is connected via an angle lever (14) to a spring bracket (7) holding a spring (9). The spring bracket (7) is also connected to the pressure bar (4).

Abstract: An automatic control device that basically employs a pneumatic system that controls the pressure exerted on the shaft of the fabric pressure shoe, pressure that was traditionally exerted by spring systems or in any case mechanical-type systems that were always based on the pressure or the pull of a spring.

Abstract: A sewing machine with a work pressing bar positioning device is disclosed, the sewing machine substantially comprising a work pressing bar holding mechanism including an upper holder movable axially of a work pressing bar and a lower holder fixedly connected to the work pressing bar, spring means including a compression spring having a force for normally pressing down the upper holder axially of the work pressing bar, a height changing mechanism including a guide member which is operated to move between a first position laterally close to the work pressing bar and a second position laterally away from the work pressing bar and a transmission mechanism operated in response to operation of the guide member to operate the work pressing bar holding mechanism, the transmission mechanism including upper and lower links which are operatively connected to each other and to the guide member while the upper link has one end operatively connected to the upper holder and the lower link has one end operatively connected t

Abstract: Since a solenoid device generates the maximum drawing force at the final position of the retracting stroke of a plunger when it retracts into the solenoid device, the drawing force becomes so large at a position close to a pressing end position of a pressing member that energy is consumed than necessity, and the solenoid device is made large-sized. Accordingly, an arch clamp foot lifting apparatus of the present invention solved this problem by connecting a wedge-shaped block member to a plunger of the solenoid device and retaining an upper portion of the pressing member on a cam surface of a block member through a driven portion.

Abstract: When arch clamp feet are replaced with other, set screws fastening a retaining plate are all removed, and the same set screws are fastened again to the retaining plates after the replacement of the arch clamp feet, which takes time and labor. Accordingly, the replacement of the arch clamp feet involved in the change of working process in a sewing mill, causes the deterioration of the rate of operation. A arch clamp foot pressing device is provided with a carrying unit which moves arch clamp foot lifting levers substantially horizontally along axes connecting between tip end portions and base end portions of the arch clamp foot lifting levers while it is guided by a pin, wherein the arch clamp foot lifting levers are moved in the direction of the base end portions by the carrying unit so that the tip end portions of the arch clamp foot lifting levers are disengaged from slots of arch clamp feet.

Abstract: The load which is applied during a period when a presser foot is retracted is reduced, and the time period required before the restart of the sewing operation is shortened.A swing member which is swung in a predetermined range by a cam for driving a presser foot and fixed to the main shaft is coupled also with the presser foot through a link. The presser foot is vertically moved by the link mechanism in synchronization with the rotation of the main shaft. Joint movement direction controlling device is disposed. The device restricts the direction of a reciprocation locus of one joint of the link mechanism, and changes the movement direction of the reciprocation, thereby causing the second swing member to operate so as to vertically move the presser foot in a predetermined range, and the presser foot to be set in a raised state in which the presser foot is raised to a retraction position.

Abstract: A holing sewing machine including a workpiece-presser elevating and lowering mechanism which elevates and lowers a workpiece presser, a needle-thread cutting mechanism which cuts a needle thread conveyed by a sewing needle; a bobbin-thread cutting mechanism which draws a bobbin thread from a bobbin and cuts the bobbin thread, an interlocking mechanism which mechanically interlocks the elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, with one another, such that the elevating and lowering mechanism elevates the workpiece presser after the needle-thread cutting mechanism cuts the needle thread and the bobbin-thread cutting mechanism cuts the bobbin thread, a drive source which drives the interlocking mechanism to operate the workpiece-presser elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, the drive source being controllable with respect to a speed of operation thereof to drive the inter

Abstract: An actuating device (54) for lifting the presser foot (53) of a sewing machine. A piston (14) having a piston rod (15) is supported on the bearing (13) which guides the presser foot support rod (18). The presser foot support rod (18) is biased against the sewing material by a spring (40). The piston (14) is surrounded by a cylinder (26). The piston (14) with the piston rod (15) and the cylinder (26) form a piston-cylinder drive for actuation by compressed air, to urge the piston rod (15) against the force of the spring (40) and thereby lift the presser foot (53) off of the sewing material. The actuating device (54) has two set screws (42, 45) which respectively control the spring force acting on the presser foot and the distance the presser foot is raised by the actuating device. Two embodiments are described.

Abstract: A miniature handy electric sewing machine includes a casing including a grip portion, a sewing table projecting from one end of the casing, a sewing head pivotally mounted on a rear end of the sewing table and including a sewing needle fastened to its front end, and a cloth presser lever having at its front end a pressing portion which is pressed against an upper surface of the sewing table by a spring force. The cloth presser lever is pivotally mounted on the rear end of the sewing table together with the sewing table. The sewing machine further includes an oscillation mechanism for vertically oscillating the sewing head and a feed mechanism operatively connected to the oscillation mechanism for feeding an object to be sewed by predetermined pitches, the object being held between the sewing table and the pressing portion of the cloth presser lever.

Abstract: This sewing machine is provided with a stop member for stopping the downward movement of the presser foot holder in the case that the cushion piece on the retainer is left out. This stop member is provided with a cushion piece on its upper surface to stop the abutting member provided in the presser foot holder in the shock-absorbed condition. Besides, this stop operation is performed in the condition where a clearance to place cloth is made between the upper surface of the bed and the lower end of the presser foot. As a result, in the normal condition, it is needless to say that the sewing work can be performed without damage of the cloth or without occurrence of big sound, and even in the abnormal condition that the cushion piece employed on the retainer to prevent the occurrence of the noise has been left out, the sewing work can be continuously performed preventing damage of the cloth or occurrence of excessively big sound.

Abstract: This invention is a dual foot pedal control for a sewing machine consisting of a foot activated tiltable pedal assembly mounted on a base member which is attached to a stabilizing mat. The stabilizing mat is positioned between the legs of a sewing machine table, on which a sewing machine is mounted. The tiltable pedal assembly is connected by rod to a sewing machine control arm which activates the sewing machine. In addition, the sewing machine is speed controlled by the counter-clockwise pressure on the pedal assembly which is transmitted by rod to the sewing machine control arm. The pedal assembly, when foot-tilted clockwise, activates an air control valve which directs compressed air to an air cylinder which is connected to and opens the presser foot of the sewing machine. When tilted counter-clockwise the air control valve dissipates air to the air cylinder allowing the presser foot to lower and clamp the material to be sewn.

Abstract: A sewing machine of the type having an electronic control unit is provided with an arrangement comprising a needle mechanism with a needle bar, a presser bar (12) provided with a presser foot (13) and actuated by a resilient means (22) to provide a controllable presser foot pressure on the cloth (28) to be sewn, and a lifting device for adjusting the presser foot between its operative position and an inoperative position spaced from the cloth. According to the invention, the lifting device comprises a power driven lifting lever (15) coacting with the presser bar (12) for adjusting the presser foot (13) between said two positions and a third, operative position, in which the presser foot pressure is relieved, and the lifting lever (15) is operatively connected to said resilient means (22) for controlling the presser foot pressure.

Abstract: A pressure foot lifter mechanism is installed as an attachment on any sewing machine. In a preferred embodiment, a clamp is attached to the presser foot lifter bar of a sewing machine, and a coil spring is used to bias a cable attached to the clamp in a downward direction. The coil spring extends over and biases the presser foot lifter bar, and thereby the pressure foot, downwardly. The cable passes through a flexible tube removably attached to the outer surface of the machine. The tube extends upwardly from the coil spring, then across the horizontal body of the machine, and then downwardly to a hole in the table top of the machine. A washer or flange is placed over the hole in the table top. The tube which carries the cable is removably attached at several locations to the sewing machine. When pressure is applied to a foot pedal, a cable tension will increase and the end of the cable attached to the pressure foot lifter bar will lift the presser foot from the table.

Abstract: Sewing machine with an upper feed mechanism is provided with a stroke-adjusting system in which the drive connection between the upper feed foot and the presser foot has a three-position control device for automatic adjustment of the height position of the upper feed system. This is preferably a hydraulic control device, whose hydraulic cylinder is subdivided by its adjusting piston into two chambers. A hydraulic difference measuring unit is provided wherein the two chambers 82a, 82b of the hydraulic cylinder 59 are connected via two antiparallel-connected pressure relief valves 71, 71'. Each pressure relief valve 71, 71' preferably consists of a spring-tensioned check valve R and a pressure-limiting valve D arranged downstream of it.

Abstract: A sewing machine having a needle thread cutting unit and a needle thread holding device for holding a cut leading end portiion of the thread drawn from an eye of a needle. The needle thread holding device includes a holding means provided at the pressure foot. The holding means is movable between a needle thread clamping position and a needle thread releasing position. The holding device also includes drive means connected to the holding means for selectively moving the holding means to one of the needle thread releasing position and the needle thread clamping position, pressure foot position detection means for detecting a position of the pressure foot, needle position detector for generating a needle position signal indicative of the upper needle position and the lower needle position, and control means connected to the pressure foot position detection means the sewing machine energization signal generating means and the needle position detector.

Abstract: In a sewing machine, a pivotable lever is provided in accordance with the present invention which carries a presser foot which is brought by an actuating device from a low position to a high position. In the low position the foot is applied to the material to be sewn. In the high position the foot is spaced from the material. The lever is equipped with rolling members which rest on guide ramps. The members and ramps have a profile such that during displacement of the presser foot between its two positions, the foot always follows a vertical path.

Abstract: A transmission mechanism used for sewing machines equipped with a carriage comprising a base plate having an opening, a fixing clamp for mounting the base plate to the carriage, and an apparatus for transmission which can be vertically attached to the base plate under the opening thereof. The transmission apparatus has a plunger passable through the opening to perform a reciprocating movement. The transmission apparatus has all its elements substantially disposed within a housing encased by an upper cover and a lower cover thereof to form an integral piece and to reduce the total length thereof.

Abstract: A sewing machine controller which inhibits compensation sewing if the cloth presser is raised, if the treadle switch is activated or a proximity switch mounted near the needle detects the operator's hand.

Abstract: An apparatus for lifting the presser foot of a sewing machine prevents the bar guide bracket from rotating outward even when the presser foot is unintentionally raised due to a thick workpiece. As an additional safety interlock, the presser bar guide bracket is prevented from dropping down when the presser foot is rotated to provide space for changing the needle or setting the thread.

Abstract: This invention relates to a presser foot lifter in a sewing machine. The presser foot lifter comprises a pressure relief mechanism for lessening the force of a spring means adapted to bias a presser foot towards a throat plate, a presser foot drive mechanism for lifting the presser foot and a manual operation mechanism operable by the operator. When the operation mechanism is actuated, the pressure relief mechanism operates to lessen the force of the spring means and the presser foot drive mechanism operates to lift the presser foot. According to the present invention, the presser foot can be lifted to any desired height.

Abstract: The presser-foot of the fabric presser device in a sewing machine is pivotable about an axis of a presser-bar in order to provide space in the stitching region of a needle in order to allow manipulations to be made to the needle. The fabric presser device is constructed such that the presser-foot can be pivoted or swung away from the region of the needle only when the needle and the presser-bar are in a raised or elevated position.