TW200419029A - Needle thread holding device for sewing machine - Google Patents

Abstract

It is an object for a needle thread holding device in a sewing machine to maintain the length of a needle thread remaining on the back of a cloth to be small and constant. A needle thread holding device (60) in a sewing machine (100) has such a structure that a needle thread is bent by a projection portion (2c) provided on a gripping member when the needle thread is to be gripped by a holding surface (1f) of a holding member and a gripping surface (2e) of the gripping member. The holding force of the needle thread holding device to hold the needle thread can be regulated in two stages including a resistance force applied with bending given to the projection portion and a gripping force for gripping the needle thread by the holding surface and the gripping surface, and the needle thread is held after the length of the needle thread on the back of a cloth is regulated.

Description

Grave, description of the invention: [Technical field to which the invention belongs] Field of the invention The present invention relates to an embroidery thread holding device for a sewing machine, which clamps an embroidery inserted through an embroidery needle positioned below a needle plate at the beginning of sewing operation. The end of the thread and the end of the embroidery thread are moved, so that it is clamped to a position separated from the vertical movement path of the needle. Previously Background of the Invention Traditionally, it is well known that when the embroidery needle leaves the embroidery needle channel hole (needle eye) of the needle plate upward, an embroidery thread holding device is used to start the sewing operation under a needle plate against the first A needle is used to clamp an inserted embroidery needle and to hold the embroidery needle at a predetermined position. For the sewing machine to form a needle at the beginning of sewing operation, it is used to stabilize the remaining embroidery thread on the needle tip at the beginning of sewing operation. Length (see, for example, Patent Document 1). Furthermore, a well-known embroidery thread holding device is used to hold an embroidery thread pulled up by a thread take-up device by a predetermined holding force at a dead point above a needle bar, and to hold the embroidery thread as described above In the end portion, adjust the length of the embroidery thread remaining on the north side of the fabric (for example, see Patent Document 2). [Patent Document 1] Japanese Patent Publication No. 2671478. [Patent Document 2] Gazette JP-A-2000-325683. 200419029 L Content; 1 Problems solved by the invention However, as for Patent Document 1, when the embroidery needle passes through the embroidery needle channel hole of the needle board, the embroidery thread is clamped. At this time, the embroidery thread is not completely pulled up by a thread take-up. Therefore, there is a problem in that the length of the end of the embroidery thread remaining on the tip of an embroidery needle is increased. Furthermore, as far as the patent document 2 is concerned, depending on the adjustment of the pressure reducing valve, the force of the embroidery thread holding device for holding and holding the embroidery thread is changed and adjusted. Therefore, the problem is that it is difficult to adjust the holding force. Furthermore, the thread is clamped by a holding force 10 for allowing the thread to be pulled through a thread take-up device. A holding timing is set near the dead point above a needle bar, where the thread take-up device has started to rise. For this reason, an inertial force exerted by pulling the embroidery thread through the embroidery thread take-up device generates slack on the embroidery thread and changes in the remaining embroidery thread length on the back of the fabric, resulting in unstable sewing operation quality. 15 Furthermore, there is a problem in that the end of the embroidery thread held by the embroidery thread holding device hangs down in a vertically downward direction at a clamping position, and is therefore easily connected with one of the lower parts. The rotary hook part is in contact with and caught in the rotary hook part or the dirt of the rotary hook part is stuck to the embroidery thread. An object of the present invention is to provide an embroidery thread holding device for a sewing machine, which can hold the length of the embroidery thread remaining on the back of the fabric in a fixed and small length, and can prevent the dirt of the rotary hook from adhering to the embroidery thread. Method for solving these problems In order to solve these problems, one of the first viewpoints of the present invention is to hold a Xianggang against a seam line of 6 5 :::, which is located at the bottom of the seam at the beginning of sewing work and In the embroidery mountain of an embroidery needle above a path for the hook-rotating shuttle (90) and Ye Da (92), insert a piece of thread through the spot and move the end of the thread The part is thus clamped to a position where the vertical movement path is separated to form a position with a predetermined number of stitches of 10 ❿ 15 stitches, and then the _clamped end of the reed thread is loosened, one of which is fixed = member _... lower plate ㈣ __ Surface ⑼, _ clamping member (example / plate 23) includes-the button surface (2e) is arranged twelve with the holding surface to sandwich _ with the holding surface, for relative movement = holding member And New Age's _ device (B), the control device that controls the phase 2 of the driver 秘 'The holding member and the clamping member are configured to be 7 movable to the initial position, wherein the holding surface and the clamping surface are 2 On both sides of the vertical movement path of the embroidery needle, the 2-line bending portion (123) at the intermediate holding position includes a The -bend on the component and-the second f-curved portion formed on the clamping component. Phase = also used to bend the performance line ', which causes a sliding resistance to the embroidery thread and at the same time allows 20 :: boring__ 之 -pick thread The device pulls up, and-the thread is clamped by the embroidery thread, and the performance thread that is pulled up by picking the thread tightly is clamped between the lost surface and the control device. The driving device is provided to relatively move and stop the holding member, and move the clamping member from the initial position to the middle holding position before the fine stitching device starts to pull up the embroidery thread at the sewing start position. Only according to the first aspect of the present invention, the embroidery thread holding device of the sewing machine, is made by the embroidery needle interposed between the lost surface and the holding surface ... The needle clamps the end of the embroidery thread inserted through a fabric. Then, hold the end of the embroidery thread 2nd until the two to three stitches are stitched to the temple to consolidate it. Therefore, it is possible to prevent the embroidery thread of the first stitch from being separated from the fabric due to the action of raising the embroidery stitch and the upward pulling action. The dead thread I is placed again. In the intermediate holding position, the curved part of the embroidery thread is opened at the sewing operation. The thread take-up device bends the embroidery thread before the thread is pulled up and causes sliding resistance. The thread device is pulled up, and then, the holding surface and the thread Φ are indeed _ held off by the embroidery thread pulled up by the thread take-up device located at the button position. Therefore, it is possible to prevent the slack of the embroidery thread from being pulled by pulling the embroidery thread through the thread take-up device, and to stabilize the length of the segment from the eye of the embroidery needle to the end of the embroidery thread and pinch the embroidery thread, which results in The length from the eye of the needle to the end of the thread is constant. Furthermore, clamp the embroidery thread which is pulled up by taking up the thread. Therefore, it is possible to shorten the length from the eye of the needle to the end of the thread. Therefore, the length of the embroidery thread remaining on the back of the fabric can be set to be constant and small. A second aspect of the present invention is directed to the embroidery thread holding device of the first aspect of the present invention, wherein the curved portion of the embroidery thread will be interposed between the holding surface and the clamping surface, and the two surfaces are on one of the rotary hooks (91 One side of) is close to each other, and a part of the embroidery thread hanging downward is bent. According to the second aspect of the present invention, the same function as that in the first aspect of the present invention can be achieved, and further, the bent portion of the embroidery thread will be in the direction of the hook axis from the holding surface to the clamping surface. The end of a part of the hanging thread is bent. Therefore, in the middle holding position or the position where the embroidery thread is clamped and held 200419029, the path for the embroidery thread to reach the rotary hook from the eye portion of the needle can be changed (considered as the sliding surface of the rotary hook or the race) Surface) to keep the hook away from the hook by bending the embroidery thread, and to prevent the hook from contacting the embroidery thread to prevent the thread from being contaminated. 5 Furthermore, the end of the embroidery thread remaining from the tip of the bent part of the embroidery thread is further bent according to its own hardness, and then hangs down. When the embroidery thread slides in the intermediate holding position in this state, the end of the embroidery thread which hangs from a front part of the tip of the embroidery thread bending part is directed toward the embroidery thread bending part in the protruding direction of the embroidery thread bending part. The bottom side is pulled, and a centrifugal force is generated in a downwardly bent portion from the tip of the 10-curved portion, so the end of the embroidered thread is lifted in the direction of the curved portion. Therefore, it is difficult for the end of the embroidery thread to travel in the direction of the hook, and contact with the hook can be avoided. Therefore, it is possible to further prevent the dirt of the hook from sticking to the end of the thread, and to prevent the end of the thread from being caught by the hook. 15 [Embodiment] A method for accomplishing the invention A specific embodiment of the present invention will be described below with reference to Figs. 1-16. In order to explain the structure of each component of a sewing machine main body including an embroidery thread holding device of the present invention, in a specific embodiment, individual directions are defined by XYZ axes of 20 shown in the drawings. A Z-axis direction is parallel to the vertical movement of an embroidery needle, and X- and Y-axis directions are perpendicular to each other and cover a plane perpendicular to the Z-axis direction. In particular, the + side in the X-axis direction is represented as "left", the + in the Y-axis direction and the side are represented as "front" and "rear", and the + and One side is shown as "up" and "down", respectively. 9 ^ One of the sewing machines 100 shown in FIG. 1 has an outline shape of the outer shape = wrongly formed by a base portion including a substantially horizontal base surface 31 a. 1 vertical roll on the rear end of the base portion 31 The barrel portion 8 and an arm portion 33 extending from the upper portion of the vertical roll portion 32 forward almost flatly with the base portion knife 31. The sewing machine 100 includes a needle bar driving mechanism for vertically moving a needle 7 'to attach an embroidery needle 52 to 10 15 3' in a lower portion of the front end of the arm portion 33. A thread take-up device driving mechanism for vertical A thread take-up device 44 is located in the side surface portion of the end of the arm portion of the arm portion, and a rotary hook drive% mechanism is used to rotate a rotary hook 90, which is used to insert a bobbin thread at a value of -In the lower part of the fabric-in the loop part, it is laid by the winding provided by the base part 31 disposed under the needle bar 35 and the needle 52, and-the embroidery thread holding clothes for 60 The end of the embroidery thread supplied by the embroidery needle 52 is clamped in the base portion 31, and the end of the embroidery thread is moved to be clamped to a position separate from the vertical movement path for the embroidery needle 52. 36 、 _ 20 The driving mechanism of the needle bar is called by a main spindle motor which is the driving member of the needle bar, and the spindle motor series (not shown), and ... Action, and the forward movement drive material rod 35❸ drive member (unexpected) is frequently used as a driving mechanism, the needle rod 35 is used to rotate the main mandrel to complete two or two movements at a time (see Figure 2). The main spindle of the spindle motor 36 (not shown) is provided with a 36a (see FIG. 6). The encoder 36a is used to detect the rotation angle of the main 10 200419029 spindle. Each time a _pulse signal is output to the control device 70 (see Fig. 6), the main spindle of the main spindle motor 36 rotates by one degree. The floss hole (also regarded as a needle eye) is formed at the lower end of the embroidery needle 52 In some parts, the embroidery thread is guided from an embroidery thread supply source to the embroidery needle 52, 5 through the embroidery thread adjusting mechanism% and the thread take-up device 44 which will be described below pass through the threading hole. When the rod 35 moves vertically in an interlocking manner, the needle 52 is passed through the needle eye 51 ′, and A needle plate 50 on the bottom wire surface 31a of the base portion 31 is inserted into the base portion 31 to feed the embroidery thread toward the rotary hook 90 located on the side of the base portion 31. Xin 1 〇The thread take-up device driving mechanism converts the rotation of the main spindle into a vertical reciprocating motion, and uses the main spindle motor 36 as a thread take-up device to drive the rotation of the main spindle (not shown) to rotate the vertical movement. The reciprocating action is transmitted to the thread take-up device 44. With the drive mechanism of the thread take-up device, the thread take-up device 44 uses the main mandrel to rotate one time to complete the one-time reciprocating action (see section No. 15). A cycle of vertical reciprocation is equivalent to a cycle of vertical reciprocation of the needle bar 35, but the phase of the thread take-up device is different from the phase of the needle bar 35. In other words, the needle bar is positioned on top The timing of the points is changed from the timing of positioning the thread take-up device 44 to an upper dead point, and the timing of positioning the needle bar 35 at the bottom dead point is to position the thread take-up device 20 to 44 at the bottom dead point. (See Figure 2). A threading hole system The thread take-up device 44 is formed, and the embroidery thread guided by the embroidery thread supply source reaches the thread take-up device 44 and passes through the threading hole to the embroidery needle 52 via a thread adjustment mechanism which will be described below. The condition that the thread take-up device 44 is positioned at the bottom dead center is not. 11 200419029 The thread take-up device 44 is closest to the needle bar 35, a path length to the fabric. Therefore, the reduction from the embroidery thread supply source only stops. The thread supply source supplies the tension of the thread to the embroidery needle 521 and can prevent the tolerance. The Bento hook 9G expands 1 thread & to the end, so that the thread picking device 44 is positioned at the top dead point. ^ = Loosen the embroidery thread at the same time. Furthermore, it is separated from the needle bar 3 5 and the shaft is wound with ―T ° Thread line 4 and 4 series to wind the reel thread. Furthermore, the reel thread system and free will From the thread supply source ', the trimming tip of Xuanmei 90 is loosened, and then the expanded thread loop is pulled. ’、 The thread adjusting mechanism 39 is used for arching 15

Guide members 41 and 43, a green bow 丨 for embroidering embroidery, an embroidery thread tensioner 45 for embroidery, spring tension, and a thread diameter for adjusting the thread diameter by the tension of the thread The thread take-up spring 42 is formed. The thread guide member Chuan is guided by the thread guide device 45 ′ of the thread guide of the material I and the thread guide member 43 to the thread take-up device 44 through the thread of the thread guide device 45.

The thread tension is 45, which is constituted by a force disc group 46 for inflaming the thread guided by the thread guide member 41 between a movable disc and a fixed disc, and causes A predetermined pressing force acts on the embroidery thread clamped by the tension disc group 46, thereby giving the embroidery thread tension. 20 The thread take-up device spring 42 is arranged between the thread tensioner 45 and the thread guide member 43 and swings around the tension disc group 46, and the thread system guided by the self-tension disc group 46 hangs on The thread take-up device spring 42. Under the condition that the tension is rarely applied to the embroidery thread, the thread take-up device spring 42 is arranged on a clockwise side around the tension disc group 46 (see the direction of FIG. 1 12 200419029). At this time, the path for connecting the embroidery thread with the thread take-up device spring 42, the embroidery thread guide member 43, and the tension disc group 46 is not a straight line but a load is applied from the ahai tension disc group 46 to The embroidery thread of the embroidery thread guide member 43. When the tension acting on the embroidery thread is increased, the thread take-up device Bobo 5 42 series is arranged on a counterclockwise side around the far tension disc group (see the direction in the figure above). In a situation where the tension of the embroidery thread is equal to or higher than a predetermined tension, the path for connecting the embroidery thread with the thread take-up device spring 42, the embroidery thread guide member 43, and the tension disc group 46 is linear. The load of the thread between the tension disc group 46 and the thread guide member 43. 10 Therefore, the tension of the embroidery thread is adjusted. The shuttle driving mechanism converts a main spindle (not shown) into a reciprocating rotation due to the rotational motion of the main spindle motor 36 serving as the shuttle driving member, and transmits the reciprocating rotation to the shuttle shaft 91. Then, according to the reciprocating rotation of the hook shaft%, the hook 90 is reciprocated. This hook shaft ... is supported in parallel with the Y-axis direction. The rotary hook 90 is disposed directly below the embroidery needle 52 (needle bar 35). The rotary hook 90 includes a blade tip 92 for hooking an embroidery thread from the needle 52 through the needle eye 5m of the needle plate 5 down, and a bobbin thread wound by a bobbin thread (not shown in the The embroidery needle 52 completes a vertical reciprocating motion, but then, the rotary hook ^ 20 rotates. When the embroidery needle 52 is downward, the rotary hook 90 hooks the embroidery thread passing through the leaf Z 92, thereby forming a The embroidery loop. When the rotary hook 90 rotates, the embroidery loop is expanded. After that, the rotary shuttle 90 inserts a thread under the bobbin and passes through the embroidery loop. The shuttle 90 cooperates and inserts the lower thread 13 through the embroidery thread, so a needle is formed on a work piece. As shown in FIGS. 1 and 3 to 5, the embroidery thread holding device 60 is configured to clamp the component A, Used to clamp and hold) the end of the embroidery thread between the -holding surface and the -clamping surface, and the end of the embroidery thread that is loosened and thus clamped (holding), for relatively moving and operating the clamp A driving member B of the member A and a detection member C for detecting the operation position of the driving member B. The clamping member eight includes a lower plate (“retaining member) 1 having a retaining surface If and an upper plate (an retaining member) 23 having a lost surface ˜ disposed opposite to the retaining surface 1f. As shown in Figure 3, the lower plate! The system is an almost flat-shaped member, which is long in the direction of injustice, and one of its longitudinal directions is set parallel to the Y-axis direction in a supported state on the driving member B. A rectangular through hole lb is formed in the longitudinal direction of the lower plate i, which is located on the front end of the lower plate 丨, and one of the four inner peripheral surfaces corresponding to the right angle of the through hole ratio, which is arranged at A tip end side serves as a holding surface lf. The holding surface If is in a state where the lower plate 1 is supported on the driving member B, and is perpendicular to the hook shaft 91. Further, a slit-like hole portion lc is in the longitudinal direction of the lower plate 1, and is formed on the side of the end portion behind the lower plate 1. Furthermore, the lower plate 1 is provided with a front latch ld protruding downward from its lower surface, and the left latch 1e protrudes downward in slightly left and rear portions of the front latch Id. The holding surface 1 f serves as a holding surface for sandwiching the embroidery thread with the clamping surface 2 e. As shown in FIG. 3, the upper plate 23 is formed by a tip member 2 having a clamping surface 2e, and an upper plate body 3 for holding the tip member 2 and a front end portion 3a and holding it. Made up. In FIG. 3, the tip member 2 has a downwardly-extending clamping portion located on the side of the front end of the tip member main body 2a, and a forward end from the lower end of the clamping portion 2b in FIG. 3 The protruding protruding portion 2c and a knotted 5-hole 2d are formed on the rear end side of the tip member main body 2a. A surface located on the side before the clamping portion 2b serves as a clamping surface for clamping the embroidery thread with the holding surface If. The clamping surface 系 is perpendicular to the hook shaft 91 in a state where the tip member 2 is supported on the driving member B. ⑩ 10 The upper plate main body 3 is almost a flat plate-shaped member, which is slightly shorter than the lower plate 1. A combined protruding portion 3b protruding downward is disposed in a portion below the front end portion 3a of the upper plate main body 3. Furthermore, the upper plate 23 is provided with a rear latch 乂 protruding downward from one of its lower surfaces, and a right latch 3 (1 protruding downwards in the slightly right and front portions of the rear latch 3c, respectively. 15 Tip member 2 of The coupling hole 2d and the coupling protruding portion 3b of the upper plate main body 3 are fitted and combined with each other. Therefore, the tip member 2 and the upper plate main body 3 are integrally assembled, and thus the upper plate 23 is completed. In the middle, the upper plate 23 and the lower plate 1 are superposed on each other, and the upper plate 23 and the lower plate 1 are relatively movable in the longitudinal direction of the upper plate 23 and the lower plate 1 and are located in the clamping portion 2b of the tip member 2 in the upper plate 23 20 and The protruding portion 2C is inserted in the through hole lb of the lower plate 1, and the latch 3c after the upper plate 23 is inserted in the hole portion lc of the lower plate 1. The latch Id before the lower plate 1 and the latch 3c after the upper plate 23 are inserted. One of the middle hole portions 7b of a guide member 7 described below is connected to each other through a coil spring 15 200419029 positioned below the guide member 7. In a state where the coil spring 9 contracts the most, before the lower plate 1 The pin Id is closest to the pin 3c after the upper plate 23 and the left pin 16 of the lower plate 1 To approach the right latch 3d of the upper plate 23. In other words, in this state, the left latch 10 and the right latch 3d sandwich the lower plate U (the upper plate 23) therebetween, and are arranged on the lower plate 1 ( The vertical direction of the upper plate 23) is upward. Moreover, the coil spring 9 is a force spring, and the front latch ld and the rear latch 3c are always excited in this direction, so they are close to each other. Therefore, the holding surface If of the lower plate 1 and the clamping surface 2e of the upper plate 23 are always kept in an abutting state until an external force is applied. The driving member B includes a motor 4 as a driving source of the embroidery thread holding device 60, a rocking link fixed to a rotating shaft 4a of the motor 4, ..., a connecting member 5, one end of which is connected to the One of the rocking links 10 is connected to the rocking end portion 10b, and the other end portion is connected to the clamping member A via a cam plate 15 connecting rod 6 which will be described below, for holding the guide of the clamping member A. Part 7 is connected with the cam plate link 6 to guide the money action, and a guide cover 8 is used to cover the clamping member A held by the guide 7. —Motor 4 is—stepping motor, which rotates at every predetermined angle according to the operation control signal of the control device, and reflects the -pulse signal based on the angle of a main U 20 spindle (not shown) output from the encoder 36a While turning. The connecting member 5 is arranged in the γ direction in the drawing, and among them, the: ⑴ system is constituted by the _ hole portion 5a, and the other end portion is constituted by the:-portion 5b. The connecting member 5 transmits the movement in the γ direction to the clamping member A via the cam plate link 6 in the swing end portion 10 b of the swing link 10. 16 200419029 The cam plate link 6 is configured to intersect the lower plate 丨 (upper plate 23), and set its longitudinal direction to the X direction of the drawing. The cam plate link 6 is provided with a cam plate pin 6a, which protrudes downward from a lower surface of one of them. Therefore, the cam plate link 6 can swing around the cam plate latch 6a. Furthermore, a left hole portion 6b is formed at one end portion of the cam plate link 6 in the longitudinal direction, and a right hole portion 6c is formed at the other end portion. The left latch 6 of the lower plate 丨 and the right latch 3d of the upper plate 23 are respectively combined with the left hole portion 6b and the right hole portion. Furthermore, a cam-like portion 6d is disposed at the left end portion of the cam plate link 6, which is slightly curved to fit the outer peripheral surface of a roller 2 described below. 15 20

The guide 7 is fixed to a main frame of the sewing machine 100 which is not shown. In the guide member 7, in a longitudinal direction, a groove portion 7a having a predetermined width is formed in one of its central portions, and in the longitudinal direction, an intermediate hole portion 7b is formed in the groove. Slots are being partialized. Further, in the longitudinal direction, the slit-shaped left and right hole portions 7C and 7d are formed on the left and right sides of the groove portion 7a of the guide 7, respectively. The left hole portion 7c and the right hole portion 7d are formed in parallel with each other, and the left hole portion 7c and the right hole portion are slightly moved in the vertical direction. In contrast, the left hole portion ⑽ is formed in front of The side and the right hole portion 7d are formed on the rear side. In addition, the roller 12 is attached to the lower part of the left edge of the guide 7 by the Xiang-screw 7e㈣. The width of the groove portion 7a is almost equal to the width of each of the lower and upper plates. The guide cover plate 8 is almost a flat sign, and is fixed to the guide 7 in four positions on the front and rear sides with four screws 17a, respectively. Therefore, the lower plate 1 and the upper plate 23 are sandwiched between the guide 7 and the guide cover plate 8 and guided to the groove portion 7a of the guide 7, so that the lower plate 丨 and the upper plate 23 can be prevented from being loosened. In the driving member B, a shaft portion, which is one end portion of the rocking link 10, is fixed to the rotating shaft 4a of the motor 4 by 10a '. The connecting member 5 uses a step screw 11 which is slidably inserted into a hole portion 5a formed on one end portion of the connecting member 5 and is combined with the swinging end portion 10b of the swinging link 10. Further, in a state pivotally supported by the cam plate latch 6a, the cam plate link 6 is attached to a hole portion 5b formed on the other end portion of the connecting member 5. With this structure, the connecting member 5 uses the rotation of the rotation shaft 4a of the motor 4 within a predetermined angle range, and the rocking action of the rocking link 10 (see arrows in Figs. 7, 9, 11 and 13) L0 to L3) move longitudinally (see arrows M0 to M3 in Figures 7, 9, 11 and 13). The longitudinal movement of the connecting member 5 is driven to the cam plate link 6. Furthermore, the left bolts le of the lower plate 1 and the right bolts 3d of the upper plate 23 are respectively inserted through the left hole portion 7c and the right hole portion 7d located in the guide 7, and the left bolt le and the right bolt 3d are respectively inserted. Stoppers 13 and 13 are attached to the left hole portion 6 b and the right hole portion 6 c of the cam plate link 6. Therefore, a driving force generated by the rotation of the rotation shaft 4a of the motor 4 is transmitted to the left bolt ie and the right bolt 3d via the cam plate link 6. The left and right plug pins 3d and 3d are vertically slidably arranged by the left and right hole portions 7c and 7d, respectively. Therefore, the driving force is transmitted longitudinally and relatively to move the lower plate 1 and the upper plate 23 (holding member A). The detection member C includes a slit plate 20 fixed to the connecting member 5 and 200419029 first and second sensors 21 and 22 fixed to a main frame of the sewing machine 100 not shown, and is used to detect the slit plate 20 When moving with this connection member 5. The slit plate 20 is a member fixed to the connecting member 5 and moves longitudinally with the connecting member 5. The slit plate 20 includes a first detection section 20a 'which reaches and leaves the position matching with the first sensor 21 and detects its presence by the first sensor 21, and a second detection Part 201), it is to reach and leave the position matching the second sensor 22 and detect its existence by the second sensor 22. # Brother induction ^ §21 and "A sensor ^ § 22 include light-emitting units 2la and 22a, and light-receiving units 2lb and 22b, respectively. For example, a light-emitting diode (LED) is used as a light-emitting unit and a light sensor is used. As a light receiving unit. The following definition is explained: when a light output from the light emitting unit is received by the light receiving unit, an OFF state is generated, and when a light output from the light emitting unit is not received by the light receiving unit, An ON state is generated. More specifically, when the first sensor 21 detects the first detection portion 20a, and when the first detection portion 20a uses the longitudinal movement of the slit plate 20 to cover the light emitted from the first sensor 21, the system The first sensor 21 is in the ON state, and the first sensor 21 is in the OFF state when the 20th detection section 20a does not cover the same light. The first sensor 21 outputs a detection signal indicating the ON state or the OFF state to the control device 70. Similarly, the second sensor 22 detects the second detection portion 20b, and when the second detection portion 20b masks the light emitted from the second sensor 22, the department 19 200419029 is in the ON state, and When the second detection section 20b does not cover the same light, the second sensor 22 is in the OFF state. The second sensor 22 turns out a detection signal indicating the ON state or the OFF state to the control | Set 70 〇5 in the figures 7, 9, 11 and 13, in the plan (a) and the side The view (dagger) shows the light path 25 of the light output from the light emitting element toward the light receiving unit with a dotted line. Next, a control system of the sewing machine 100 will be described.

As shown in FIG. 6, the control device 70 is generally composed of a central processing unit (CPU) for performing different tasks, and a program for storing different processing tasks such as a control and a decision The read-only memory (ROM) and a random access memory (RAM) used as a working memory in different processing operations are not shown in detail. Main spindle motor 36, motor 4 of driving member B (embroidery thread holding device 60), first sensor 21 and second sensor 22 in 15 detection member C, and one of the start switches of the sewing machine 100 SW is connected to the control device 70 via a system bus and a driving circuit. The control device 70 can identify a 20-rotation angle of the rotation of the main spindle motor 36 based on a pulse signal output from an encoder 36a disposed on the main spindle of the main spindle motor 36. Furthermore, the control device 70 can confirm the operating position of the clamping member a based on the detection signals inputted by the first sensor 21 and the second sensor 22 from the detection member c. Furthermore, the control device 70 controls the driving action 20 of the motor 4 of the driving member B. 200419029. When a sewing operation start signal is input from the start switch SW, the action is related to the rotation of the main spindle motor 36 which has been confirmed and recognized. The angle and the operating position of the clamping member A are matched. Furthermore, the detection component C also uses the original retrieval 5 component of the motor 4. When the power of the control device 70 is turned on, an original search operation is performed until a predetermined signal is output from the detection member c. The read-only memory (ROM) of the control device 70 stores the number of pulses of the motor 4 and is used to move the clamping member A from an original position to a predetermined position, such as an initial position, an intermediate holding position, or a The embroidery thread is held in a position, and a predetermined number of pulses are output to the motor 4 at a predetermined timing of the spring 10, so the clamping member A is controllably driven to a predetermined position. More specifically, the control device 70 drives the main spindle motor 36 based on the sewing operation start signal transmitted from the start switch sw, and recognizes the detection of a signal from an encoder via the encoder 36a of the main spindle motor 36. The inspection angle 15 exits the embroidery needle 52 used for a first stitch of a fabric, and in order to cause the motor 4 to move the clamping member A to an "intermediate holding position," it is controlled to output a driving signal to the intermediate holding of the motor 4. Position control member. Furthermore, the control device 70 recognizes that the thread take-up device 44 reaches one of its top dead points from the detection of the encoder signal passing through the encoder 36a of the main spindle motor 36 by an angle of 15 degrees from 20 degrees In order to cause the motor 4 to move the clamping member A to an “embroidery thread holding position”, control the embroidery thread holding position control member for outputting a driving signal to the motor 4. Next, it will be explained when the sewing machine 100 performs a sewing operation. The operation of the embroidery thread holding device 60 during the operation. 21 First, the operation from the period immediately before the start of the sewing operation to the period immediately after the start of the sewing operation will be described with reference to FIG. 7 (01) Based on the An initial position signal transmitted by the control device 70, the motor 4 rotates at a predetermined counterclockwise angle in the drawing. _____ 5 uses a rotating shaft to rotate it, and kisses the shaft part as a fulcrum (see The arrow L0 in FIG. 7) shakes the rocking link 10. Further, the rocking link_connection member 5 is slidably attached to the rocking link_connection member 5 by the step screw 11 and the rocking action of the rocking link 10 (see section 7). (a) The arrow M0 in the figure moves toward a front side (forward movement). The cam plate link 6 pivotally supported on the connecting member 5 is completely completed as the connecting member 5 moves toward uranium. (03) The right latch 3d of the upper plate 23 combined with the right hole portion of the cam plate link 6 is along the right hole of the guide 7 as the cam plate link 6 moves forward The part 7d moves forward and collides with the right hole part 7 (1 before the wall (close), causing the 15 right latch 3d to be adjusted in a forward state. In this state, the right latch 3d is integrally formed with the upper part. The plate 23 is also moved forward, and the upper plate 23 is arranged in a foremost position. (04) Similarly, to the left of the cam plate link 6 The left pin le 'of the lower plate 1 combined by the part 6b moves forward along the left hole part 9 of the guide 7 with the cam plate link 6 moving forward. In this case, refer to Left hole portion 7c and right hole portion 7d, the left hole portion 7c is relatively slightly positioned in front of the right hole portion 7d. At the same time, after the right latch 3d of the upper plate 23 collides with the wall of the right hole portion 7d (state 03) ) Therefore, the left pin ie of the lower plate 1 is moved forward along the left hole 22 in the guide 7 by setting the right pin 3d of the upper plate 23 to a point. The direction of the left pin 16 The forward movement, that is, the forward movement of the lower plate 丨 is continuously performed until the through hole lb of the lower plate 1 reaches a predetermined frontmost position provided directly below the eye 51 of the needle plate 50. When the predetermined foremost position is reached, the control device 70 stops the motor 4 and stops moving forward. In a forward direction, the length of the left hole portion 7c in the guide member 7 has the tolerance, and after reaching the foremost position, the bolt le does not collide with the front wall of the left hole portion 7c, thereby preventing loss of synchronization of the motor 4. Sex. (5) When the lower plate 1 and the upper plate 23 are arranged at the foremost position, the latch pin Id before the lower plate 1 and the latch pin 3c after the upper plate 23 are separated into a state of 10 in the Y direction, and the coil spring 9 is overcome. Motivation. In this situation, in the longitudinal direction, the latch pin Id before the lower plate 1 and the latch pin 3c after the upper plate 23 are approached to each other by the exciting force of the coil spring 9. Since the driving force of the motor 4 is greater than the exciting force of the coil spring 9, the lower plate 1 can be arranged in the foremost position to overcome the exciting force of the coil spring 9. 15 (〇6) Furthermore, when the lower plate 1 and the upper plate 23 are arranged at the foremost position, the holding surface if located in the through hole 1b of the lower plate 1 and the end before the clamping surface 2e and the tip member The protruding portions 2c attached to the front end 3a of the upper plate 23 in 2 are separated from each other in the Y direction, so that the through hole lb is in an open state. At this time, the through-hole lb and the needle eye 51 of the needle plate 50 remain vertically stacked, and after the sewing operation is started, the embroidery needle 52 for the first needle passes through the through-hole lb and the needle eye of the needle plate 50 51, can move vertically. Therefore, a position where the clamping member A is arranged on the vertical movement path of the embroidery needle 52 will be regarded as an "initial position" in the following description. In the "initial position", the detection member C has a narrow position. The slit plate 20 is moved forward with the forward movement of the connecting member 23, and the first detection portion 20a and the first primary detection portion 20b in the slit plate 20 are disposed on the first sensor 21 and the first detection portion 20b. The second sensor is in the unpicked position in 22, and is set to the off state separately. (07) When the flame arresting member A is in the "initial position," the end of the embroidery thread is inserted through the supply. The embroidery needle 52 used for the first needle is vertically moved to pass through the eyelet 51 and the through hole lb. When the embroidery needle 52 is downward, the end of the embroidery thread is pulled down by the rotary hook 90. Next, when the embroidery needle 52 is raised, as shown in FIG. 8, the embroidery thread inserted into the through hole 1 b hangs down. The operation of the embroidery thread holding device 60 after the sewing operation is started (after the vertical movement of the first needle embroidery needle 52 is performed) will be described with reference to Fig. 9. (P1) According to an intermediate holding position signal transmitted from the control device 70, the motor 4 rotates the rotation shaft 4a clockwise at a predetermined angle in the drawing. By the rotation of the rotation shaft 4a, the rocking link 10 is shaken by setting the shaft portion 10a as a point (see arrow L1 in Fig. 9 (a)). Further, the connecting member 5 slidably attached to the rocking link 10 with the stepping screw 11 is moved toward a rear side in accordance with the rocking action of the rocking link 10 (see arrow M1 in FIG. 9 (a)). (Move backward). (P2) The cam plate link 6 pivotally supported on the connecting member 5 moves completely backward as the connecting member 5 moves backward. (P3) When the cam plate link 6 starts to move backward, first, the rear pin 3c of the upper plate 23 is pulled in the direction of the pin id before the lower plate 1 by the exciting force of the coil spring 9. Therefore, in a state where the right latch 3d of the upper plate 23 is kept close to the wall in front of the right hole portion 7d of the 200419029 guide 7, only the lower plate 1 starts to move backward. When the lower plate 1 completes a predetermined amount of movement and then stops, the retaining surface If of the lower plate 1 is disposed behind the tip of the protruding portion 2c of the upper plate 23, resulting in a "middle retaining position" in which the through hole lb is closed of. 5 This "intermediate holding position" means a state in which only the lower plate 1 is moved backward until it reaches the cam plate latch 6a of the cam plate link 6, the right latch 3d of the upper plate 23, and the left latch of the lower plate 1. 1 e is arranged so as to be arranged in a line almost perpendicular to the longitudinal direction of the holding member A (the lower plate 1 and the upper plate 23). At this time, the motor 4 is rotated at a predetermined angle 10 that matches the "intermediate holding position." In the "intermediate holding position", the slit plate 20 of the detection member C is moved backward with the connection member 5. Moving and moving backward, and the first detection section 20a of the slit plate 20 is arranged in the detection position in the first sensor 21 and is set to the ON state. Furthermore, the second detection The part 20b is arranged in an undetected position in the second sensor 15 and is set to the OFF state. Before the thread take-up device 44 starts to rise, the lower plate 1 is completed. Initially, Position, to move to the "intermediate holding position". In the "middle holding position, the holding surface If of the middle, lower plate 丨 is not close to the clamping surface 2e of the upper plate 23, and the embroidery thread is not pinched and held. In the" middle holding position, " "Initial position, at (20) 20, the protruding portion 2c bends the embroidery thread inserted in the through hole lb, and hangs down in the direction of the shuttle shaft 91 of the shuttle 90. More specifically, as As shown in FIGS. 10 (a) and (b), the clamping member A intersects one of the upper surface 2f (the protruding surface) of the protruding portion 及 and one of the lower surfaces 1 of the lower plate 1, and bends it in the one direction.俾 It crosses with the thread picking device 44 in a direction 25 200419029 related to the embroidery thread to pull the embroidery thread, to clamp the embroidery thread in between, and to give resistance to the action of pulling the embroidery thread. Yi Luzhi, lower board 1 of The lower surface lg is set as a first curved portion, and the upper surface 2f of the protruding portion 2c is set as a second curved portion, and is set as the lower surface of the first curved portion and as the second curved portion. The upper surface 2 constitutes an embroidery thread bending portion 123, which covers the lower plate 1 and the upper plate 23. By giving this resistance, it is possible to prevent the embroidery thread pulled up by the thread take-up device 44 from being loosened by the inertia force, and to prevent the embroidery thread from sliding from the clamping member A, and further, to maintain the distance from the eye of the embroidery needle 50 to the embroidery thread. This length of the end portion is fixed. 10 Furthermore, 'Specially, when the embroidery on the same embroidery line is pulled out, the sliding action at the end of the embroidery line is pulled out at the "middle mouth holding position," and the embroidery position is in place. The protruding portion 2 (: of the tip of the wire bending W blade 123—the front end of which the winding portion hangs down is pulled in toward the protruding portion of the dog-out portion 2c toward the bottom of the protruding portion 2. A centrifugal force is generated from a portion 15 that is bent downward from the tip of the protruding portion 2c, so the end is raised in the direction of the protruding portion (see arrow P in FIG. 10). For this reason, the embroidery thread is arranged in the lower portion. The hook 90 in the middle is separated. Therefore, it is possible to prevent a malfunction caused by the contact between the embroidery thread and the hook 90. Furthermore, referring to FIG. 11, it will be explained that the clamping member A is clamped after the "intermediate holding position 0". And the thread holding device 60 before or after holding the embroidery thread ^ (Q1) After the action (P3) in the "intermediate holding position", the motor 4 continuously completes the drawing-rotate clockwise and shake the rocking link 10, and the connecting member 5P now swings the link When the rocking action of 10 is moved backward, the cam plate inserts 26 200419029 pin 6a, right insert 3d, and left insert 1e. The cam plate is arranged to be almost perpendicular to the longitudinal direction of the clamping member A. In this state, the lower plate 1 before the pin Id and upper plate 23 after the pin 3c, in a longitudinal direction, are excited closer to each other by the excitation force of the coil spring 9. Therefore, the holding surface If of the lower plate 1 is close to the upper plate 5 The clamping surface 2e, as shown in FIG. 12, causes the clamping member A to clamp the "embroidery thread clamping position" of the embroidery thread. The “embroidery thread clamping position is set, and thereafter, the motor 4 continuously rotates the rotation shaft 4a at a predetermined angle clockwise in the drawing based on a thread holding position signal transmitted from the control device 70. Using the rotation shaft The rotation of 4a sets the shaft portion 10a as a point by 10 (see arrow L2 in FIG. 11 (a)) to shake the rocking link 10. Furthermore, the stepping screw 11 is used to slidely fix the rocking link 10. The connecting member 5 of the lever 10 moves to a rear side (backward movement) in accordance with the rocking action of the rocking link 10 (see arrow M2 in FIG. 11 (a)). (Q2) pivotally supported on the connecting member 5 The cam plate link 6 moves completely backward with the backward movement of the connecting member 5. (Q3) In this state, the clamping surface 2e and the holding surface 1? Are in an adjacent state. Therefore, in In a direction approaching each other, the upper plate 23 and the lower plate 1 are no longer moved by the excitation of the coil spring 9. Therefore, by the backward movement of the cam plate link 6, the lower plate 1 and the upper plate 23 are the same The amount of movement is moved backward by 20 movements. In other words, the clamping member A is moved backward while clamping the embroidery Therefore, the clamping member A is moved to the "embroidery thread holding position," and in this state, it moves slightly from the "embroidery thread holding position, and moves backward, and then clamps the sewing thread." Embroidery thread holding position " It is arranged on the back side of the eye 51 of the needle plate 50, and the clamping member A is withdrawn from the vertical movement path of the embroidery needle 52. 27 200419029 In the "embroidery thread holding position", the slit plate 20 of the detection member C It moves backward with the backward movement of the connecting member 5, and the first detection section 20a and the second detection section 20b located in the slit plate 20 are respectively disposed on the first sensor 21 and the second sensor. In the detection position in 22, and both of them are set to 5 (ON). In a state where the clamping member A is retracted to the "embroidery thread holding position", the embroidery needle 52 constitutes a predetermined number of stitches (for example, , 2 or 3) (the position of the needle), and thus the sewing operation is performed. Next, with reference to FIG. 13, the operation of the thread holding device 60 after clamping (holding) the end 10 of the thread is described. (R1) According to a release position signal transmitted from the control device 70, the motor 4 The rotation shaft 4a is rotated clockwise at a predetermined angle in the drawing. With the rotation of the rotation shaft 4a, the shaft portion 10a is set to a point (see arrow L3 in FIG. 13 (a)) to shake the shaking The connecting rod 10. The sliding member 11 is slidably attached to the connecting member 5 of the rocking link 10 with a step screw 11 and follows the rocking motion of the rocking link 10 (see the arrow in FIG. 13 (a)) ^ 3) Move towards a rear side (backward movement). (R2) The cam plate link 6 pivotally supported on the connecting member 5 moves backward as the connecting member 5 moves backward. When more than a predetermined movement After the amount of 20 days, the cam-shaped portion 6d of the cam plate link 6 is in contact with the outer surface of the roller 12, and the contact portion is set to a point to cause the cam plate link 6 to swing clockwise . (R3) The cam-like portion 6 of the cam plate link 6 is brought into contact with the roller 12 to control the rearward movement of the left latch 16 of the lower plate 1 and the left hole portion 6b 28 of the cam plate link 6. On the other hand, the right latch 3d of the upper plate 23 combined with the right hole portion 6c of the cam plate link 6 moves rearwardly along the right hole portion 7d of the guide 7 as the cam plate link 6 swings. Therefore, the amount of backward movement of the upper plate 23 is greater than the amount of movement of the lower plate 1. Therefore, the lower plate 1 and the upper plate 23 are arranged at the rear positions. (R4) When the rearward movement of the lower plate 1 is controlled by contacting the cam-shaped portion 6d of the cam plate link 6 with the roller 12, and the upper plate 23 is then moved backward, the latch Id and the upper plate before the lower plate 1 After 23, the latch pins 3c are separated from each other against the excitation force of the coil spring 9. In this situation, the lower plate 丨 the front pin 1 (1 and the upper plate 23 after the pin 3c in a longitudinal direction are excited by the exciting force of the coil spring 9 to approach each other. Because the driving force of the motor 4 is greater than the coil spring Therefore, the upper plate 23 can be disposed in the final position against the exciting force of the coil spring 9. (R5) Furthermore, when the lower plate 1 and the upper plate 23 are moved backward, if they are located in the through holes lb of the lower plate 1 The holding surface 2e and the clamping surface 2e of the tip member 2 attached to the front end 3a of the upper plate 23 are separated from each other due to the difference in the amount of backward movement between the lower plate 1 and the upper plate 23, resulting in the through hole lb In an open state ', therefore, a predetermined amount of movement is exceeded. In other words, in the state of the "embroidery thread clamping position" and "embroidery thread holding position," the upper plate 23 is in the actions (R2) and (R3) ) In relation to the lower plate 1 moving relatively backward, the holding surface If located in the through hole 1 b of the lower plate 1 is separated from the clamping surface 2 e of the tip member 2 attached to the front end 3 a of the upper plate 23. As shown in the figure, the clamping member A can release the embroidery thread. Therefore, the clamping member A a Release the position where the warp is clamped and held, and set it as a "releasing position". 200419029 At the "releasing position," the slit plate 20 of the detection member c follows the connection member 5 backward. Move and move backward 'and the first detection section 20a of the slit plate 20 is disposed in an undetected position in the first sensor 21 and is set to the OFF state. Furthermore, the second detection The part 20b is disposed at the detection position in the second sensor 5 and is set to the ON state. Next, the flowchart shown in FIG. 15 and FIG. 2 will be described. Operation of the sewing machine 100 of the embroidery thread holding device 60. Figure 2 shows a curve α, which shows the position of the embroidery needle 52 during a rotation of the main spindle of the main spindle motor 36, and the curve is cold. Indicates the position of the pick-up 10-thread device 44. Furthermore, in Fig. 2, ν indicates the position of the cloth and the rotation angle of the main spindle. First, when the power (not shown) in the sewing machine 100 is turned on, The original search operation of the motor 4. The original search operation is performed by causing the control device 70 to rotate The motor 4 executes it until a signal output from the self-inspection member c changes from ON to 15 OFF or from OFF to ON (step S1). Then, the control I sets 70 to move the clamping member A, also That is, the lower plate i and the upper plate 23 reach the "initial position" (step S2). Then, the 'control device 70 determines whether the clamping member A is set to a position based on the signal of the first sensor 21 and the second sensor 22. Set to "initial position 20" (step S3). If the debt detection signal of the first sensor 21 and the second sensor 22 shows T «(step_3; Yes (YES)), the process proceeds to The steps are as follows: 2) Right first—the detection signals of Qian 11 21 and the second sensor 22 have not been connected (step S3, No), then the processing operation proceeds to the error 30 200419029 error in step §19 Process the job. In step S4, ^^ is determined by the start switch swd device 7G—whether the help start signal is borrowed or not (step S4; when an input is made—the display is turned on and the start-up letter is turned on to drive the job, and the work proceeds to step S5. , Where the embroidery needle 52 drops (step S5) 6. 'And related to-the cloth will be used for the field of the first needle. Next, the embroidery diagonal 5 used autonomously? The encoder 36a of the motor 36 will display the first diagonal, ,, '疋 No is related to a code raised by the fabric. The soft-input device 70 is controlled. The control signal is input to the control unit. The encoder signal is determined by the cloth. — Needle 52 is used. According to the green, (step S6). In the second figure, 1 and 10 are shown under the main core of the main spindle motor 36 to withdraw from the fabric. Easy to 4 hearts *-the angle exceeds 245 Set 70 to see if an encoder output. Also decide whether the embroidery needle 52 is withdrawn from the fabric. If the control device 7 () determines that the embroidery needle 52 used by 15.t is withdrawn from the fabric (one no ⑽), repeat The processing operation of step S6 is up to the encoder 36a of the autonomous spindle motor 36, and the embroidery used for the first needle is displayed by the person who has exited from the fabric. Up to an encoder signal. 20 On the other hand, if the control device 70 determines that the first needle 52 used for the first needle is withdrawn from the cloth (step S6; Yes), the drive signal is output to the motor 4 of the driving member B, and the motor 4 is driven by the motor 4 The driving force will move the lost member A from the "initial position" to the "intermediate holding position," (step magic). Then, the control device 70 determines whether the clamped member A is based on the first device 2i and the second sensor 22 The detection signal of the first sensor 21 is set to the "intermediate holding position" (step S8). Θ '31 200419029 If the detection signal of the second sensor 22 is OFF, the detection signal of the first sensor 21 is switched to one. n state (step S8; YES), the processing operation proceeds to step S9. On the other hand, when the second sensor 22 is set to the OFF state and the fifth sensor 21 is not switched to the ON state ( (Step S8; NO), the processing operation proceeds to the error processing operation of step S19. Next, the control device 70 determines whether the thread take-up device 44 is based on the encoder signal transmitted by the encoder 36a of the autonomous spindle motor 36. , Placed on the thread take-up device 44 at an angle of 15 degrees On this side of the top dead point (step S9). Figure 2 shows that the thread take-up device 44 is arranged at the top dead point when the angle of the main spindle of the main spindle motor 36 is 70 degrees. Therefore, the side of the 15-degree angle above the dead point of the thread take-up device 44 is identified depending on whether the encoder output exceeds 55 degrees. When the control device 70 determines that the thread take-up device 44 does not reach the dead point above the thread take-up device 44 When the side is at a 15-degree angle (step S9; NO), the processing operations of steps 15 to 9 are repeated until the thread-taking device 44 reaches the side at a 15-degree angle above the dead point of the thread-taking device 44. On the other hand, when the control device 70 determines the side of the 15-degree angle at which the thread take-up device 44 reaches the dead point on the thread take-up device 44 based on the encoder signal transmitted from the encoder 36a of the autonomous spindle motor 36 (step S9) ; (YES)), then the 20 processing operation proceeds to step S10. By this, it is determined to end the pull-up of the embroidery thread by the thread take-up device 44. Then, the control device 70 outputs a predetermined number of pulses as a drive signal to the drive The motor 4 of the component B, and the driving force of the motor 4 clamps the component A from the "intermediate solid Position "via" embroider sandwich position "to" embroider 32200419029 ,, holding position (step S10). The embroidery thread is interposed in the "embroidery thread clamping position" between the holding surface If of the clamping member A and the clamping surface 2e, while the embroidery thread is raised almost completely by the thread take-up device 44 (for example, 55 degrees) to the moment when the needle 52 penetrates the fabric (for example, 115 degrees), at a predetermined angle (for example, 5 80 degrees), the clamping member A is moved from the "intermediate holding position" to the "embroidery thread holding position" ". Next, the control device 70 determines whether the gripping member A is set at the "embroidery thread holding position" based on the detection signals of the first sensor 21 and the second sensor 22 (step S11). 10 If the detection signals of the first sensor 21 and the second sensor 22 are set to the ON state (step S11; YES), the processing operation proceeds to step "]. On the other hand, when the When the determination is 1 ^ 0 (step su; NO), the processing operation proceeds to the error processing operation of step S19. After that, the sewing machine 100 performs sewing operation 15 for the second and subsequent needles (step S12). Next, the control device 70 decides whether or not a predetermined number of needle winding positions are obtained (for example, 'second embroidery needle position X step S13'). For example, by counting the number of times of outputting a 180-degree signal output from the digital code cry 36a, it is possible to identify the number of embroidery needle positions as a predetermined number of embroidery needle positions. 20 When the control device 70 determines a predetermined number of embroidery needle positions that are not obtained (step S13, NO), the processing operation of step S12 is repeated until a predetermined number of embroidery needle positions are obtained. On the other hand, when the control device 70 decides to obtain a predetermined number of needle correction positions (step SU; YES), a step is called a processing operation. 33 200419029 Next, the control device 70 outputs a predetermined number of pulses as a drive signal to the motor 4 of the driving member B, and by the driving force of the motor 4, the clamping member A is moved from the "embroidery thread holding position," Go to the "release position" (step 514) 〇5 Then the control device 7G decides whether the clamping member is placed in the "release position" based on the detection signals of the first sensor 21 and the second sensor 22 (step 515) If the detection signal of the first sensor 21 shows the 0FF state and the tilt signal of the second sensor 22 shows ON (step S15: yes), the process proceeds to step S16. 方面 面 # On the other hand, the primary detection signals of the right-inductor 21 and the second sensor 22 are not combined (step S1S; No (N0)), and the job processing operation proceeds to the error processing operation in step S19. Then, the control unit 7 is controlled. It is determined whether the sewing work 15 by the embroidery needle 52 is finished (step S16). If the control device 70 determines that the shaft work is not finished (step ⑽; NO), the processing operation of step S10 is repeated until the sewing Don't finish the operation "· End. The Syrian right control 1 set 7G decision When the sewing operation is determined to be completed (step training; YES), the processing operation proceeds to step 接着. Then, the control device 70 outputs a predetermined number of _'s as a driving signal to the driving member 3, and borrows By the driving force of the motor 4, the clamping structure is moved from the "releasing position" to the "initial position" (Step Suan). Holding ^ garment setting 70 determines whether the clamping member A is placed in the "initial position" according to the detection signals of the -inductor 34 200419029 sensor 21 and the second sensor 22 (step S8). If the first and The detection signals of the second sensors 21 and 22 show the OFF state (step S18; YES), and the operation of the sewing machine 100 is terminated. 5 On the other hand, if the first sensor 21 and the second sensor The detection L number of 22 has not been combined (step S18; NO), then the processing operation proceeds to the error processing operation of step S19. With the central processing unit (CPU) of the control device 70, it is stored in the unique processing unit. A predetermined number of pulses in the read memory (ROM) is output to the motor 104 which is a stepping motor, and the movement of the clamping member A to each of the positions in steps si, S7, S10, S14, and S17 is completed. In the error processing operation of step S19, if an abnormality such as loss of synchronization of the motor 4 occurs, the control device will stop the motor * and the main spindle motor 36. In this case, it can be configured to display 15 display errors (not shown) produced to inform operators The synchronization error of the motor 4 caused by the user. As described above, the operation of the sewing machine 100 is completed. Therefore, in the "intermediate holding position, the middle and lower holding surfaces if are not close to the clamping surface of the upper plate 23" 2e 'and the embroidery thread is not held or held. In the "middle holding position," the middle 'inserted thread inserted through the hole ㈣ and hanging down' is bent by the protruding portion 2c of the upper plate 23 in the direction of the hook shaft 91 of the hook 90, and is clamped by the projection Between the upper surface of the portion 20 and the lower surface of the lower plate 1. By bending the strands and threads pulled upward through the thread take-up device 44, resistance to the pull-up embroidery thread is caused. By this resistance, the embroidery thread 35 can be prevented 200419029 When it is clamped, it can slide from the clamping member A, or prevent the embroidery thread from being loosened due to the inertia force of the embroidery thread pulled up through the thread take-up device 44. Therefore, 'When the thread is held in the embroidery In the thread holding position, the shape of the embroidery thread can be stably maintained, and the length 5 of the end of the thread remaining on an embroidery needle can be kept constant. Moreover, in a specific embodiment, as in the first 〇 As shown in the figure, the thread hanging from a part of the holding surface lf and the clamping surface 接近 which are close to each other is at the intermediate holding position, "the embroidery thread is lost, or the" performance line " In the "holding position", it is located on the holding table in the direction of the hook shaft 91. ^ φ U) The lower surface lg below and the upper surface slave of the protruding portion 20 are bent. Therefore, in the middle holding position or the thread holding position, the eye of the self-made needle 52 can be changed for the thread to reach the thread. The path used by shuttle 90 (the sliding surface of the rotary hook or the race surface of the rotary shuttle) is used to pass the curved line portion 123 (the lower surface of the lower surface μ disposed under the holding surface lf μ the first curved portion) ) 15 and the upper surface of the protruding part 2c is called the second curved part)) Avoid the hook 90, and can prevent the hook from contacting the end of the embroidery thread, in order to prevent contamination of the embroidery thread. $ 再者 '当 于When the middle holding position is generated on the embroidery thread and the slide of the end of the embroidery thread is pulled out, the end of the embroidery thread that is 20: from the tip of the protruding portion 2c to the front portion is in the protruding direction of the protruding portion. Pulling towards the bottom of the knife sound of the protruding part, a centrifugal force is generated in the bending of the tip of the protruding part 2c to the blade, and the performance is improved in the direction of the protruding part. The embroidery thread is connected with the The hook 90 is separated. Therefore, the month b is easy to prevent The malfunction is caused by the contact of the embroidery thread with the rotary hook 90. 36 After that, in the “embroidery thread holding position of the clamping member A,”, the clamping surface 2 rests on the holding surface If, so it can be clamped and Hold the embroidery thread. As shown in FIG. 16, in a structure in which the embroidery thread is bent between the upper surface lh of the lower plate 1 and the lower surface 23b of one of the upper plates 23a and is allowed to be pulled up by the thread take-up device 44 and “ The intermediate holding position, at the same time, causes a sliding resistance to replace the structure shown in Figure 10. Of course, the length from the embroidery, the needle eye of the ten to the end of the strand can be set to be constant and is By switching between the "intermediate holding position and the" embroidery thread holding position ", the embroidery thread holding device 60 in the sewing machine can stably maintain the length of the embroidery thread remaining on the back of the fabric. Although when the thread take-up device 44 reaches this side of the top dead center before 15 degrees, the control device 70 moves the clamping member A from the "intermediate holding position," to the "line holding position," but the main spindle The angle is not limited to this, but may be, for example, 15 to 20 degrees before and after the dead point above the thread take-up device 44. Furthermore, it is a matter of course that it is possible to appropriately change the specific structure of the slim portion of the middle member for holding and putting the thread. For example, in the timing sequence when the lost member A is moved from the initial position to the intermediate holding position, that is, the clamping member a is moved to a position where the end of the embroidery thread is slidably clamped. When the thread take-up device 44 is pulled up, the embroidery thread can be sufficiently clamped. The timing is not limited to the moment immediately after the embroidery needle 52 is withdrawn from the fabric, but ^ is immediately after the embroidery needle 52 has passed through the hole 1 b of the lower plate 1 The moment the neighborhood exits.

Although in the specific embodiment, the motor 4 is a driving source commonly used for moving each of the lower plate 1 and the upper plate 23 in the clamping member A 200419029, the elements may be configured to be separately moved by independent motors. Advantages of the Λ & invention 10 15 In the bus holding device of the sewing machine, the holding member and the holding structure are moved relative to each other, and the embroidery thread is formed by the bending part of the embroidery thread formed on the _ member and the clamping structure = bending. Therefore, it is possible to switch the intermediate holding position, in which the thread is allowed to be pulled upward by the thread picking dream of the sewing machine, and the clothing is caused to slide at the same time, and the position of the embroidery thread is clamped. The embroidery thread is clamped between the holding surface and the clamping surface. Before the rib machine's secret holding device towel, before the noodle industry started to pull the embroidery thread on the thread take-up device, the curved part will bend the embroidery thread and cause-sliding resistance, while allowing the thread take-up device to be used in the middle holding position. The embroidery thread H _ is held on the surface and the thread take-up device 4 in the grip position from the watch thread domain is held in place. Therefore, it is possible to prevent the winding process from being caused by pulling the thread through the thread take-up device.

20 The length of the segment from the end of the eye to the end of the thread is stable and the thread is clamped and used to set the length of the segment from the eye of the needle to the end of the thread to a fixed length. Furthermore, the embroidery thread pulled up by the thread take-up device is clamped. As a result, the length from the eye of the needle to the end of the thread can be shortened. Therefore, it can make the length of the embroidery thread remaining on the f side of the fabric constant and small.

Furthermore, the bent portion of the embroidery thread can be bent in the direction of the hook axis, from the end of the embroidery thread which is partially suspended between the holding surface and the lost surface. Therefore, in the middle holding position or the position where the thread is clamped and held, 38 200419029 can change the path for the thread to reach the hook from the eye of the needle to bend the part of the shuttle by the thread. Leave and prevent the hook from contacting the embroidery thread and prevent the thread from being contaminated. [Schematic description 1 5 The first diagram is a perspective side view of a part, showing a sewing machine equipped with an embroidery thread holding device of a specific embodiment, and the second diagram is a timing diagram showing a needle bar related to a thread take-up device Fig. 3 is an exploded perspective view showing the operation of the rotation angle of the main spindle of the sewing machine of the specific embodiment, and Fig. 4 is a perspective view showing the embroidery thread holding device of the specific embodiment. Looking down at the embroidery thread holding device of the specific embodiment, FIG. 5 is a perspective view showing the embroidery thread holding device of the specific embodiment viewed from above. 15 FIG. 6 is a block diagram showing the details of the specific embodiment. The control system of the sewing machine, FIG. 7 is a diagram for explaining the “initial position” of each component constituting the clamping member, the driving member and the detection member of the specific embodiment, (a) is a plan view and (b ) Is a side view, FIG. 8 is a perspective view for explaining the “initial position” of the clamping member of the specific embodiment, and FIG. 9 is a diagram for illustrating the clamping of the specific embodiment. Components, driving components and detection components The "intermediate holding position" of a component, (a) is a plan view and (b) is a side view, Fig. 10 is-the figure is used to illustrate the intermediate holding position of the clamping member in a specific embodiment; —, (A) is a perspective view and (b) is a side view. Figure 11 is a diagram for explaining each component of the clamping structure, the moving structure and the detection structure of the specific embodiment. "Embroidery thread holding position", (a) 5 is a: side view and (b) is a-side view, brother 1 2 ~ h _,:, α, ❺ a perspective view, used to explain the specific embodiment of the clip The "clamping position of the embroidery thread" of the holding member, FIG. 13 is a diagram for explaining the clamping structure constituting the specific embodiment

The "releasing position" of each component of the moving member and the detection member, (a) is a plan view of 10, and (b) is a-side view, Fig. 14 is a perspective view, For explaining the "release position" of the clamping member in the specific embodiment, Fig. 15 is a-side view showing a variation of the clamping member, and Fig. 15 shows you the inflammation. ^ Φ 马-flow chart ， Shows the operation of the sewing machine of the specific embodiment. 0 Key components represent the symbol table. [Figure 1... · Lower plate (holding member) h.... Front end part b ... through hole lc .. · slit-shaped hole part Id. ··········· The left bolt lock If ··· holding surface lg ··· lower surface (first-curved portion) 2 ... tip member 2a ... · tip member body 2b ... clamping portion 2c ... protruding portion 2d ··· Coupling hole 2e ... Clamping surface 2f .. · Upper surface (second curved portion) 3 ... Upper plate body

40 200419029 3a ... front end 3b ... combined protruding part 3c ... rear latch 3d ... right latch 4 .... motor 4a ... rotation shaft 5 .... connecting member 5a ... hole portion 5b ... hole part 6 ... cam plate link 6a ... cam plate latch 6b ... left hole part 6c ... right hole part 6d ... right pin 7 ... guide 7a ... .Groove part 7b ... Middle hole part 7c ... Left hole part 7d ... Right hole part 7e ... Screw 8 ... Guide cover 8a ... Screw 9 .. Coil spring 10a ... shaft portion 10b ... shaking end portion 11 ... step screw 12 .. roller 13. stopper 20 .. slit plate 21 ... first sensor 22 ... second sensor 23 ··· Upper plate (clamping member) 25 .. Optical path 35 .. Needle bar 36 ... Main spindle motor 36a ... Encoder 44..Thread take-up device 51..Eyelet 52 ... Embroidery needle 60 .. Embroidery thread holding device 70 .. Control device 90 .. Hook 91 .. Hook shaft 92 ... Leaf tip 100 .. Sewing machine 123 ... Bending part A .. Clamping member B .. drive component C .. detect component

41

Claims (1)

200419029 Patent application scope: 1. An embroidery thread holding device of a sewing machine, which is arranged at the beginning of a sewing operation under a needle plate and above a path of a blade tip of a rotary hook opposite to the embroidery needle. In one position, one end of one embroidery thread inserted through the five stitches is clamped, and the end of the moving embroidery thread is clamped to a position separated from the vertical movement path of one of the embroidery stitches, constituting a predetermined number of stitches. An embroidery needle position, and then releasing the clamped thread end, including: a holding member including a holding surface and a first bending portion; 10 a clamping member including a clamping surface system Arranged opposite to the holding surface and used to clamp a strand between a second curved surface and the holding surface; a driving device for relatively moving the holding member and the clamping member; and 15 a control device for controlling the The driving device, wherein the holding member and the holding member are configured to be relatively movable to an initial position, and the holding surface and the holding surface are arranged to move vertically in the embroidery needle On both sides of the diameter, the middle part of the embroidery thread bending part includes a first bending part and a second bending part crossing each other to bend the embroidery thread, thereby causing a sliding resistance to the embroidery thread while allowing the embroidery thread to pass through the sewing machine. One of the thread take-up device is pulled up, and an embroidery thread clamping position, wherein the embroidery thread pulled up by the thread take-up device is clamped between the holding surface and the clamping surface, and the control device controls In order to relatively move and stop the driving device, the driving device stops the holding member, and moves the clamping member from an initial position to an intermediate position before starting to pull up the embroidery thread by a thread take-up device at a sewing operation place. Then, Move it relatively to the embroidery position. 2. The embroidery thread holding device of the sewing machine according to item 1 of the patent application scope, wherein 5 the curved part of the embroidery thread will be interposed between the holding surface and the clamping surface, and the two surfaces will face each other on one side of the rotary shaft of one of the rotary hooks When approaching, a part of the embroidery thread hanging down is bent. 43