Abstract: A coating film is formed on a surface of rubber by applying a coating material containing a solvent which swells a rubber and a resin on the surface of the rubber material.

Abstract: A threading device of a sewing machine includes a thread inserting base formed with a thread path hole having a thread inserting port opened toward an outer side of a sewing machine frame, and further formed with an air path hole which joins the thread path hole in the vicinity of the thread inserting port, an air supply device coupled to the air path hole to supply compressed air, and illuminating means provided on the sewing machine frame to irradiate a joining portion of the thread path hole and the air path hole. The thread inserting base includes a transparent member through which at least the joining portion of the thread path hole and the air path hole can be visually recognized.

Abstract: In the jointing method of jointing an optical fiber F a softening point of which is higher than an optical lens L to the optical lens L, only the optical lens is softened by heating, and an end face as a joint portion of the optical fiber is pushed into a joint portion of the softened optical lens to thereby joint them.

Abstract: A surface mounting apparatus includes a mounting head which is movable in X and Y directions and which mounts an electronic component on a positioned board, and a board recognizing camera is fixed to a base and which moves integrally with the mounting head. A correction jig includes a correction mark which is imaged by the board recognizing camera, and an imaging result is used to correct temporal change in an interior portion of the camera including an optical system, and is fixed to the base.

Abstract: A thread cutting device includes a thread catching member having a catching portion, wherein the thread catching member moves back and forth across a path of a lower thread reeled out from a bobbin so as to catch the lower thread by the catching portion and cuts the lower thread by cooperating with a fixed knife, a first power transmitting portion which transmits a power to the thread catching member, a first cam member provided on a lower shaft rotated by a sewing machine motor and transmits a first moving force to the thread catching member through the first power transmitting portion, a second power transmitting portion which transmits a second moving force from a stepping motor to the thread catching member through the first power transmitting portion.

Abstract: An upper looper driving device of a sewing machine is provided. The device includes an upper looper driving shaft which is rotatable around an axis thereof, an upper looper holder having an upper end portion at which the upper looper is held, an upper looper swinging arm having one end portion supported by the upper looper driving shaft such that a position of the upper looper swinging arm is adjustable along an axial direction of the upper looper driving shaft and the other end portion to which the upper looper holder is rotatably coupled, and an upper looper guide slidably holding the upper looper holder. The upper looper guide is supported by a frame of the sewing machine such that a position of the upper looper guide is adjustable along a direction parallel to the axial direction of the upper looper driving shaft.

Abstract: In order to recognize grid-like reference marks on a jig plate positioned in a mounting area by means of a substrate recognizing camera respectively, to obtain a positional shift amount of a mounting head with respect to XY coordinates on an apparatus of each of the reference marks, and to correct a mounting position, thereby carrying out a mounting operation, a jig component positioned and mounted sequentially on each of the reference marks formed on the jig plate by means of a nozzle head is recognized by the substrate recognizing camera, a shift amount of XY coordinates acquired by the camera recognition of the jig component from XY coordinates on the apparatus of the corresponding reference mark is obtained as corrected data on the nozzle head with respect to the reference mark, and a correction is carried out based on the corrected data when an electronic component is to be mounted on a substrate by means of the nozzle head.

Abstract: A thread cutting device of a sewing machine is provided. The thread cutting device cuts a thread extending between a horizontal shuttle and a throat plate of the sewing machine. The thread cutting device includes a fixed blade, a first thread catcher, a second thread catcher, a driving assembly which moves the first and second thread catchers such that the first thread catcher catches the thread before the second thread catcher catches the thread and pulls the thread toward the fixed blade to cut the thread, and a guide member disposed between the first thread catcher and the driving assembly. The guide member guides the first thread catcher from an advanced position to a thread catching position to catch the thread, and further guides the first thread catcher from the thread catching position to a standby position to turn the first thread catcher toward the fixed blade.

Abstract: A threading device includes a threading shaft holding a threading hook, a threading operation inputting mechanism from which a back-and-forth movement is given to the threading hook, a first supporting mechanism movably supporting the threading shaft in an X-axis direction, a second supporting mechanism movably supporting the threading shaft in a Y-axis direction, and a positioning mechanism which, when a movement operating portion is operated, moves the threading shaft along a path corresponding to an arrangement of each of the needles. The positioning mechanism includes a first cam mechanism which moves the threading shaft in the X-axis direction, and a second cam mechanism which moves the threading shaft in the second direction. The threading shaft is sequentially moved to positions corresponding to the arrangement of each of the needles in the horizontal directions in accordance with the operation of the movement operating portion.

Abstract: A thread tensioning device of a sewing machine for forming multiple types of stitches using a plurality of threads is provided. The thread tensioning device includes thread tensioners disposed to correspond to the threads, an adjusting mechanism coupled to the thread tensioners to select a stitch type and to simultaneously adjust the tensional force applied from each of the thread tensioners to the corresponding thread such that the tensional force is selected from reference tensional forces corresponding to the selected stitch type, fine adjustment mechanisms disposed to correspond to the thread tensioners and to be manually operable to finely adjust the tensional force applied from the corresponding thread tensioner to the corresponding thread, and a reset mechanism coupled to the fine adjustment mechanisms to resets at different timings and interlockingly with the adjusting mechanism an amount of the tensional force finely adjusted by each of the fine adjustment mechanisms.

Abstract: A sewing machine includes an upper looper formed with a thread hole, an upper looper shaft which oscillates the upper looper between an upper position and a lower position, switching means operable to switch a coupled state and a decoupled state between the upper looper and the upper looper shaft, moving means for moving the upper looper, which has been decoupled from the upper looper shaft by the switching means, to the lower position, a thread guiding pipe formed with a thread discharging port, and first operating means operable to decouple the upper looper and the upper looper shaft via the switching means, and to move the thread discharging port of the thread guiding pipe to a position at which the thread discharging port is aligned with the thread hole of the upper looper in the lower position.

Abstract: A sewing machine includes a looper formed with a thread hole, a looper shaft holding the looper, and a thread pipe fixed to the looper shaft. The thread pipe includes a thread inserting port at one end and a thread discharging port at the other end. The sewing machine further includes a nozzle from which air is sprayed toward the thread inserting port, a switching mechanism operable to disconnect the looper from the looper shaft when the looper is at a front position, and a moving member which moves the looper to a rear position when the looper is disconnected from the looper shaft by the switching mechanism. When the looper is disconnected from the looper shaft and is moved to the rear position, the thread discharging port matches the thread hole, and the thread inserting port becomes close to the nozzle.

Abstract: A thread cutting device of a sewing machine cuts a thread below a throat plate through which a needle is inserted. The thread cutting device includes a first thread catcher operable to catch the thread, a second thread catcher operable to catch the thread caught by the first thread catcher, a fixed blade operable to cut the thread caught by the second thread catcher, a driving portion which drives the first thread catcher and the second thread catcher such that the second thread catcher catches the thread caught by the first thread catcher and guides the thread toward the fixed blade, an attaching member to which the fixed blade is fixed and into which the second thread catcher is slidably inserted from above over the fixed blade, and a cover which covers the second thread catcher from above to restrict an upward movement of the second thread catcher.

Abstract: A threading device of a sewing machine is provided. The threading device includes a threading hook which moves forward to enter an eye of a needle to catch a needle thread, and moves rearward with the needle thread being caught to insert the needle thread through the eye, a threading shaft which holds the threading hook, an operating member which is operated to move the threading shaft, a threading operation mechanism which transmits the movement of the threading shaft to the threading hook to move the threading hook back and forth, and a restricting device which makes the threading operation mechanism inoperable when the spreader mechanism is attached to the sewing machine main body, and makes the threading operation mechanism operable when the spreader mechanism is detached from the sewing machine main body.

Abstract: A sewing machine is provided. The sewing machine includes a top covering shaft mechanism, a spreader mechanism detachably attached to the top covering shaft mechanism from below and operable to catch a covering thread and to interlace the covering thread with a needle thread inserted into a needle to form covering stitches, and an operating member having a hook portion and rotatably attached to either one of the top covering shaft mechanism and the spreader mechanism. The other of the top covering shaft mechanism and the spreader mechanism has a protrusion with which the hook portion is engageable. The operating member is rotatable between a position at which the hook portion engages with the protrusion to lock the spreader mechanism with respect to the top covering shaft mechanism and another position at which the spreader mechanism is detachable from the top covering shaft mechanism.

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 zigzag sewing machine is provided. The zigzag sewing machine includes a stitching motor which moves a needle, a feeding motor which moves a feed dog to feed a cloth, a needle swinging motor which swings the needle, a multistage-operating portion operable to adjust at least one of a feed amount of the cloth and a swing amount of the needle in a minimum adjustable unit, and a control section which controls the stitching motor, the feeding motor and the needle swinging motor to carry out a zigzag sewing in accordance with the at least one of the feed amount and the swing amount adjusted by the multistage-operating portion. The control section is configured to selectively assign a first value and a second to the minimum adjustable unit depending on whether the stitching motor is in operation or not.