Abstract: The invention relates to a tarpaulin suspension device having a base plate (2) on which are provided at least one connecting device (4) for a tarpaulin and at least two support rollers (3) which can be displaced along a longitudinal carrier of a cover frame for a tarpaulin structure. An improved tarpaulin suspension device which can be operated easily and reliably is devised, according to the invention, in that at least one guide roller (8), which is perpendicular to the support rollers (3), is mounted on a narrow side (2S) of the base plate (2).

Abstract: In an overlock sewing machine, a main shaft fixing operating shaft is provided with a differentiation ring that can be swung in a predetermined range such that, when the rotation of a main shaft is to be enabled, it is set to an enable state in a stationary state, and when the rotation of the main shaft is disabled, it is swung and shifted from the enable position. Furthermore, a looper cover open/closed detection configuration is configured by modifying a part of a typical known configuration. Such an arrangement provides an overlock sewing machine having a simple configuration that requires only a single micro switch to detect the switching between the threading mode and the sewing mode and to detect the open/closed state of the looper cover.

Abstract: An overlock sewing machine includes a main shaft fixing operating arm provided with a shaft pin engaging portion that engages with a fixing inner shaft pin and an arm provided to be operable by a user which are integrally rockable within a specified range, and further includes a main shaft fixing operating spring which urging direction is switched in both directions of an rocking direction by exceeding a neutral point by the rocking movements of the main shaft operating arm and the arm. Further, a switching cam ring is fixed to the main shaft fixing operating shaft that obtains driving force upon abutment of a slide plate pin of the slide plate to rotate the main shaft fixing operating shaft.

Abstract: A feed mechanism that advances fabric comprises at least one dog that mechanically advances the fabric toward a sewing head and at least one actuator that is coupled to and actuates the at least one dog in a servo controlled motion so that the sewing head sews the fabric at a desirable position.

Abstract: A top feeder arrangement for a sewing machine provided with a processor for controlling stitches sewn on a cloth, wherein the sewing machine has a sewing machine head which comprises a needle mechanism with a needle bar (1) provided with a needle (2), a presser bar (3) provided with a presser foot (4) and a top feeder arm (10) provided at its lower end with a top feeder (11) acting from an upper surface of a cloth for feeding the cloth in the sewing direction and wherein the sewing machine is provided with a mechanism (12, 15, 17, 18) providing a controllable pressure of the top feeder (11) against the cloth.

Abstract: A feed mechanism that advances fabric comprises at least one dog that mechanically advances the fabric toward a sewing head and at least one actuator that is coupled to and actuates the at least one dog in a servo controlled motion so that the sewing head sews the fabric at a desirable position.

Abstract: A seaming machine for seaming segments of sheet material to one another to form larger sheets includes a frame defining a sheet-receiving area and a pair of spaced seaming devices on opposed sides of the sheet-receiving area for respectively seaming opposed edges of the segments of sheet material to one another. The frame typically defines a table-receiving space for a table to support the sheet segments. The machine provides for the seaming of multiple sheet segments while the sheet segments remain atop the table or another work surface. Relative back and forth movement between the frame and work surface facilitate the process.

Abstract: A walking foot for a sewing machine includes a presser foot having a pair of supported portions, an upper feed dog feeding workpiece cloth in synchronization with vertical movement of a needlebar, a supporting member fixed to a lower end of the presser bar and having a pair of engagement supporting portions supporting the presser foot, a swinging supporting mechanism engaging the engagement supporting portions with the supported portions from horizontally outside respectively so that the presser foot is supported on the supporting member so as to be swingable, and a disengaging mechanism moving at least one of the engagement supporting portions horizontally outward from an engagement position where the engagement supporting portion is in engagement with the supported portion of the presser foot, thereby being capable of switching the engagement supporting portion to a disengagement position where the engagement supporting portion is disengaged from the supported portion.

Abstract: A differential feeding mechanism of the front and rear translation gears of a transverse shuttle-type sewing machine can adjust the fabric feeding speeds of the front and rear translation gears. A main shaft coupled to the power source of the sewing machine is used to drive a front and a rear rocking shafts parallel to but not coaxial with the main shaft to swing up and down, which further drives the front and rear translation gears to feed fabric in. The front and rear rocking shafts are separately pivotedly coupled to front and rear swing arms to form a swing unit. Counter balance weights are pivotedly installed to the swing unit. Shift elements are pivotedly installed to the counter balance weights, which can control the ranges of the planar to-and fro travels of the front and rear translation gears and creates different effects of the sewing thread.

Abstract: A transverse longitudinal-cylinder sewing machine includes an automatic thread loosening device, a tension adjustment mechanism, an automatic thread cutting bi-directional solenoid device and a differential fabric driving teeth displacement control device. The differential fabric driving teeth displacement control device consists of a primary transmission mechanism, first and second push mechanisms, a rocking mechanism, first and second adjustment mechanisms that are co-axle, and first and second fabric driving mechanisms located inside a cylinder normal to the co-axle. The second push mechanism has a linkage arm coupled on the co-axle that includes a bearing and a cam. The cam can generate eccentric movements to form an independent driving operation. The axial direction of the cylinder is directed towards the operator so that the axis of the cylinder is normal to the entire transverse work station of the sewing machine.

Abstract: A transverse longitudinal-cylinder sewing machine includes an automatic thread loosening device, a tension adjustment mechanism, an automatic thread cutting bi-directional solenoid device and a differential fabric driving teeth displacement control device. The differential fabric driving teeth displacement control device consists of a primary transmission mechanism, first and second push mechanisms, a rocking mechanism, first and second adjustment mechanisms that are co-axle, and first and second fabric driving mechanisms located inside a cylinder normal to the co-axle. The axial direction of the cylinder is directed towards the operator so that the axis of the cylinder is normal to the entire transverse work station of the sewing machine.

Abstract: In a method of operating a sewing machine for joining a jacket part (38) to a sleeve part (39), a sewing machine is employed, which has an operating and control unit. The desired stitch length and the length (la1 to ld1) of sections (a1 to d1) of the jacket part (38) and the length (la2 to ld2) of the sections (a2 to d2) of the sleeve part (39) that are allocated to the sections (a1 to d1) are fed into the operating and control unit. The required control pulses for the necessary feed drives are determined therefrom for each section (a1/a2 to d1/d2).

Abstract: A sewing unit for working in extra width in a single fabric layer, wherein a necessary gathering value is calculated by a computer of the sewing unit after the entry of the initial length of the fabric layer and the desired length to be obtained after gathering and sewing. Furthermore, the real number of stitches is calculated to control the end point of an extra width section. The particular current real stitch length value, in which the gathering values dependent on slip of the feeders of the sewing machine is taken into account, is read for this purpose from a memory.

Abstract: A sewing machine having a cylinder bed feeds cloth in the direction orthogonal to the longitudinal direction of the cylinder bed, with a main feed dog and differential feed dog provided in the cylinder bed projecting from a bed main body of the sewing machine. The main feed bar, differential feed bar, main feed oscillating shaft and differential feed oscillating shaft for moving each feed bar back and forth, and front and rear vertical oscillating shafts for moving both feed bars up and down are provided in the cylinder bed, while all other mechanisms for the main feed dog and differential feed dog are provided inside the bed main body, so that the cylinder bed may be designed thinly.

Abstract: A differential feeding device for a sewing machine includes a spindle and a shaft. A cam is fixed on the spindle and two followers are engaged on the cam for allowing the cam to move the followers up and down. A lever is fixed on the shaft and has one end pivotally coupled to one of the followers and has the other end pivotally coupled to a lower end of another lever which has a groove and which has an upper end pivotally coupled to the other follower. A block is slidably received in the groove and moved along the groove for adjusting the relative movement between the followers.

Abstract: A method and apparatus for forming a partial mattress sack which prevents radial bunching of the mattresses. The method includes the steps of feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. The apparatus includes a variable speed upper walking foot having an automatic speed adjustment.

Abstract: The invention comprises improvements to sewing machines for increasing the throat clearance of the machine. The improvements relate to 1) modifications to mechanical components of the machine to increase the throw and upper travel limits of the presser foot, upper feeding foot, needle and spreader, 2) an adjustment for allowing the speed of the upper walking foot to be variable relative to the speed of the lower walking foot, and 3) an improved biasing spring for biasing the presser foot downward.

Abstract: The presser device includes a feeder foot, a holding foot and a link transmission provided between the two feet, the two feet cooperating alternately. The feeder foot has a spur which cooperates temporarily with a mating surface on the cloth feeder. During the feed phase, the spur is obliquely inclined and does not press against the material being sewn, and therefore permits dependable ruffling of an upper layer of sewing material with respect to a lower layer of sewing material. At the start and at the end of the feed phase, the spur is vertically directed and presses against the sewing material, and thus smooth tension-ruffle-free sewing together, particularly of thin material, is made possible.

Abstract: An upper feed device for a sewing machine comprises an upper feed arm having its base end coupled with a longitudinally swinging crank and an upper feed dog attached at its front end. The mechanism for vertically moving the upper feed arm consists of a clutch mechanism comprising a lever rotatably mounted on a vertical feed shaft and swinging in cooperation with the main shaft, an abutment disposed on the lever and an abutment of a collar disposed on the vertical feed shaft, which is capable of disconnecting the cooperation of the lever and the vertical feed shaft, and a crank having a roller slidably fitting with a guide disposed parallel to the upper feed arm and which moves vertically through its attachment to the vertical feed shaft. A block is provided below the roller to engage with the free lower end surface of the crank and is adjustable in its mounting position to prevent the roller from descending more than specified.

Abstract: A feeding apparatus includes a spindle and a shaft disposed in a base of a sewing machine. A lever is fixed on the shaft and can be caused to swing by the spindle. Two followers are engaged on the spindle. A pawl is fixed on each follower for feeding cloth. One follower is coupled to one end of the lever and the other follower is coupled to the other end of the lever by a link and a lever arm. The amplitude of swinging of the lever arm can be changed so that one of the pawls can be caused to move back and forth relative to the other pawl.

Abstract: A device for controlling feeding quantity of a sewing machine includes a driver for driving an upper feed-dog and a lower feed-dog, a first setter for setting the feeding quantity of the lower feed-dog, a second setter for setting a ratio of the feeding quantity of the upper feed-dog to that of the lower feed-dog, a first adjuster for adjusting the feeding quantity of the lower feed-dog based on the set value at the first setter, and a second adjuster for adjusting the feeding quantity of the upper feed-dog based on the set value at the first setter and the ratio set at the second setter.

Abstract: A feeding device for feeding elastic strip material to a sewing machine feeding a strip in response to one or more control signals. The strip feeder uses a feed roller having an associated pressure roller to provide a feed nip with the feeding roller, a sensor directly senses the rate of feed of the strip and generates one or more sensing signals. The sensor uses a signal generator which is a rotary pulse generator, or a photoelectric device for detecting marks on the strip. A controller receives the sensing signals and generates control signals for controlling the rate of feed of the strip.

Abstract: An easing drum has an elongated horizontal shaft having an elongated horizontal axis about which the shaft is rotatable. A plurality of like circular discs are secured at their centers to said shaft and are rotatable therewith. The discs are spaced apart and lie in parallel vertical planes, each disc having an external periphery covered with a high friction coating. A mechanism is connected to the shaft to rotate it. A horizontally elongated grating is disposed above the shaft. The grating has spaced openings, each opening being aligned with a portion of the external periphery of the corresponding disc. The shaft can be raised to a first position at which the portions of the peripheries extend through the grating openings and can be lowered to a second position at which the openings are spaced above these portions.

Abstract: The invention herein described comprises a programmable microprocessor control unit 2 controlling a plurality of actuators 6, 7, 8, 9, 10, respectively associated with the differential feed dog, main feed dog and upper feed dog and/or with the presser foot and the tension group of an industrial sewing machine 5. On the basis of the adjustment parameters keyed-in in said control unit, each actuator individually causes the adjustment of the movements of each feed dog, of the pressure exerted by the presser foot and of the force causing the dish-shaped elements of the tension group to be moved close to each other to retain the threads interposed therebetween.

Abstract: A sewing machine is provided with a upper and a lower feed device with which a workpiece consisting of several plies can, when making arched and/or corner type seams, be transported in always constant position of orientation without mutual displacement of the plies. For this purpose the feed direction of both feed devices can be varied either by changing their direction of action or by geometric addition of at least two motion components.

Abstract: A shirring control apparatus automatically reads sewing data from a pattern or the like, automatically calculates the sewing data from the read data or the data previously read from the pattern, distributes the amount of shirring for each of the desired areas of a circle of the sleeve from the calculated sewing data, controls the distributed amount of shirring for each stitch, changes the amount of shirring differentially dependent upon the quality of the cloth and the bias, and displays the differential movement.

Abstract: A sewing machine having differential material feed, with a main feed dog and differential feed dog being mechanically connected to one another in such a manner that if the feed stroke length of the first feed dog is changed, the feed stroke length of the second feed dog is changed inversely in a predetermined ratio.

Abstract: A sewing machine with adjustable upper and lower feed dogs is for sewing together sections of clothing in which ungathered segments of seams alternate with seam segments with differing degrees of gather. The spring-held presser foot is coordinated with a pneumatic cylinder as an additional mechanism of increasing contact pressure during the sewing of ungathered segments of seams. The cylinder is operable by a control cam connected to an adjusting mechanism for a stitch guide of one of the feed dogs. When sewing gathered segments, the pressure of the presser foot is greatly reduced, whereas the pressure is increased during the sewing of gathered seam segments and through a "fastening" step at the end of the seam.

Abstract: An installation for linear treatment, such as the edging of textile pieces. It comprises a sewing machine, equipped with a feed dog/presser foot system, a work table which supports the piece during edging, a detection device and two recentering means controlled together or independently of each other by the instructions given by the detection device. The two recentering means consist, on the one hand, of an active guide placed immediately in front of the presser foot and ensuring displacement of that part of the piece located near the presser foot, substantially transversely with respect to the line of stitching, and, on the other hand, of a mobile support placed upstream of the active guide presenting a mobile flat surface, on the same plane as the work table.

Abstract: A lifting rocker which is pivotally supported by a link is engaged with an eccentric ring which is fixed to a main shaft of a sewing machine. By the rotation of the eccentric ring, the lifting rocker rocks up and down about a fulcrum defined by the link while causing the link to rock. A feed bar having thereon a feed dog is slidably supported by the lifting rocker, and moves in back and forth directions through the rocking of the arm to constantly maintain a definite amount of feed without respect to variation of the rotational speed of the main shaft of the sewing machine.

Abstract: A sewing machine which has two substantially independent sets of feed dog teeth comprising a set of main fabric feed dog teeth and secondary or differential feed dog teeth and includes a drive therefore defined by a main drive shaft and a two piece interconnected secondary shaft. Feed dog teeth supporting brackets are mounted between the shafts. A stirrup interconnects the support brackets so that both sets of dog teeth are moved cyclically and in a synchronized manner with one another.

Abstract: A top feed device for a sewing machine has an upper feed dog movable horizontally and vertically in synchronism with operation of a lower feed dog. The upper feed dog is vertically moved by a spring for depressing an upper feed arm to which the upper feed dog is attached, and a crank engages the upper feed arm and is vertically swingable, the crank being held in engagement with the upper feed arm at all times to prevent striking engagement therewith. A swingable shaft to which the crank is fixed and a lever angularly movably mounted on the swingable shaft and swingable in coaction with a drive shaft have abutments projecting axially in confronting relation. The abutments on the shaft are urged by a spring to angularly move in one direction. The abutments on the lever which are held against the other abutments are disengaged therefrom in a circumferential direction when the upper feed dog reaches a throat plate and stops its downward movement.

Abstract: A feed device for feeding a material pattern cut to a sewing machine for the forming of stitch groups such as a row of button holes by a reciprocating needle operating on the material pattern which is advanced through the needle path and moved in a draw-off path, comprising a draw-off roll arranged alongside the needle in a position to engage the material. The draw-off roll is arranged on a shaft which is coupled through a sleeve to another shaft containing a transport roller forming part of a material transport. Drive means are connected to drive the shafts of the draw-off roller and a laterally arranged transport roller and a drive belt is interconnected between the transport roller and a second transport roller which extends rearwardly thereof and is located at the turning point of the material draw-off.

Abstract: Device for feeding the work in a differential-feed sewing machine, comprising a feed shaft (14) oscillating about its axis, a curved lever (32) connected on the one side to the said shaft (14) and on the other side to a small connecting rod (30) which is in turn hinged with the differential feed slide (27) and an element (38) for adjusting the feed in order to vary the amplitude of oscillation of the said small connecting rod (30), wherein there are provided means (34, 36) for locking and releasing the said lever (32) with respect to the feed shaft (14) and wherein the element (38) for adjusting the feed is free at one end (38') and at the other end is articulated with a pin (31) with which the said lever (32) and the said small connecting rod (30) are hinged so that the said lever (32), released from the shaft (14), is displaced by means of the said adjusting element (38), which makes it project more or less from the shaft (14), and is locked to the shaft (14) itself in the corresponding positions.

Abstract: A differential feed system in which a main feed bar supports an auxiliary feed bar for rising and falling motion but for independent longitudinal motion and wherein longitudinal motion of the auxiliary feed bar is derived from oscillations imparted to a differential feed shaft from a main feed shaft. A safety mechanism is provided in which a safety bar is pivotably connected to a feed regulator control for the main feed and is fashioned with a lost motion connection to a feed control for the auxiliary feed. Motion of the lever for auxiliary feed control is possible in a limited range determined by the degree of lost motion in the safety bar and motion of this lever beyond the limited range will shift the regulator for the main feed system in the same increasing or decreasing feed direction as the lever for the auxiliary system is being shifted.

Abstract: The present invention includes a sewing machine (12) with a variable top feed mechanism (25) that feeds the top layer of material for a sleeve at a variable rate to change the fullness thereof. The machine (12) is driven by a motor (42) which is controlled by a controller (51). A program is taught to the controller (51) for storage therein. The controller (51) then controls both the motor (42) and a controller (45) for the top feed mechanism to regulate the number of stitches and the relative rates of speed for the top and bottom materials fed by the machine. The program initially is taught to the machine and can be utilized for any type of material or size by inputting the correct sizes and types of material on a control panel (44). The machine (12) therefore semi-automatically sews sleeves onto armholes with the correct fullness sewn therein.

Abstract: An upper feed dog automatic regulator for an overlock machine has an upper feed dog divided into a front part and a rear part. The greatest lower bound in a locus of motion of the upper feed dog varies automatically in response to the thickness of fabric being sewn so as to avoid uneven material feed, puckering between the front and rear upper feed dogs, and other sewing troubles.

Abstract: A work feed device for sewing machines, which comprises feed dog carrier bars performing an elliptical movement with the aid of two mechanisms; namely, an advancing mechanism and a raising mechanism. The advancing mechanism is composed of an oscillating shaft provided with arms, which in turn are connected to the feed dog support bars at the opposite end to that where the dogs are mounted. The raising mechanism comprises a support making a vertical reciprocating movement and which is provided with a horizontal guide along which the feed dog support bars are moved reciprocatingly by the advancing mechanism. Finally, vertical movement of the support comprises two connecting rods approximately parallel to one another. They are pivoted at one end to the said support and at the other end to a part connected to the frame of the sewing machine.

Abstract: A differential feed mechanism is provided for a high speed industrial sewing machine. The differential mechanism includes separate driving mechanisms for each of the two feed dogs mounted on separate feed bars, both mechanisms being driven from a common input shaft. Separate adjusting devices are provided for each of the feed dog driving mechanisms to adjust individually, rapidly and at will, the length of the horizontal feed stroke of each feed dog.

Abstract: A control device for a differential feed system of a sewing machine in which a control box is connected to a control motor regulating the relation of the feed rates imparted to feed elements engaging a workpiece. The control motor is formed as a pneumatic cylinder composed of individual single acting cylinders arranged in a carrier tube is series, and is operably connected to the differential feed system including two independently adjustable feed mechanisms each regulated by such a pneumatic cylinder. Different feeding conditions for the workpiece, such as feeding the workpiece in a compressed, stretched or neutral relation at various stitch lengths, may be selected by the operator at the control box.

Abstract: A machine for sewing together two workpiece parts having edges of equal or unequal length by using a bead seam, especially for joining together the edge of a vamp and the shorter edge of a plug of a true moccasin shoe, so that the length of the plug matches that of the longer edge of the vamp, in only one operation. The bead seam forming device essentially consists of an auxiliary folding and ruffling finger acting in front of the needle of the sewing machine and in synchronous driving connection with the needle; several machines are described which are provided with different bead seam forming devices.

Abstract: A sewing machine designed to stitch together two stacked fabric layers advancing at different speeds comprises an upper and a lower conveyor belt coupled with a common drive shaft by a differential gearing. The relative speed of the two conveyor belts can be manually adjusted with the aid of a friction coupling comprising two mutually parallel larger disks with relatively offset axes and overlapping surface areas contacted by a smaller disk perpendicular thereto, the latter disk being displaceable in a common axial plane of the two larger disks to vary their transmission ratio.

Abstract: A cloth feeding apparatus having two feeding devices with respect to the feeding direction and adapted to feed a cloth under a tension by setting the feeding amount on the downstream greater than the feeding amount on the upstream.

Abstract: An auxiliary feed regulator for a differential feed mechanism, which auxiliary regulator may be manipulated by a sewing machine operator during sewing without feed back or vibration to the operator. An auxiliary regulator foot treadle may be connected to an auxiliary feed actuating lever by the usual chain, the feed actuating lever being formed with a slot for receiving a stud carried by a one end of a connecting link, the other end of which is operatively associated with a slider carried by an auxiliary feed rock lever. The slot in the feed actuating lever extends in a direction to give the greatest distance from the pivotal connection of the feed actuating lever and from the slider at the extreme thereof effective during feed motion and to the least distance therefrom at the extreme thereof effective for return motion.