JP5265226B2 - Upper thread clamp device for sewing machine - Google Patents

Abstract

The device (10) has a top thread clamping unit (26) for catching and clamping a thread end region (TA) of a top thread (T), and a drive unit (27) for driving the clamping unit. A thread wiper unit wipes off a section of the thread end region under a clamped part of the thread end region in a starting path of a loop of the top thread when the thread end region is caught and clamped by the clamping unit. The wiper unit has a thread wiper body movable in a horizontal direction and held and pre-stressed by a pre-stressing unit.

Description

  The present invention relates to an upper thread clamp device for a sewing machine such as an industrial sewing machine, and in particular, for holding a thread end portion of an upper thread inserted through a first stitching needle at the start of sewing under a needle plate. The present invention relates to an upper thread clamp device for a suitable sewing machine.

  Conventionally, the thread end of the upper thread (needle thread) inserted through the threading hole of the first stitching needle at the start of sewing is formed below the needle plate for the purpose of reliably forming the stitch at the beginning of sewing. Various types of upper thread gripping devices that can be clamped (hereinafter simply referred to as upper thread gripping devices) have been proposed (for example, see Patent Document 1).

  In such an upper thread gripping device, a thread catching portion (through hole) formed in a frame shape is arranged on the vertical movement path of the sewing needle at the start of sewing, and the inside of the thread catching portion at the first stitch at the start of sewing is arranged. After the upper thread is captured, the thread capturing part is separated from the vertical movement path of the sewing needle, and then the first clamping part constituting a part of the thread capturing part and the first clamping part are opposed to each other. The upper end of the upper thread, specifically, the vicinity of the upper end of the upper thread (the end of the upper thread) is clamped between the second pinching sections arranged in a separable manner, and then a preset number of needles, for example, two needles or After the three needles are dropped, it is formed so as to release the thread end portion of the clamped upper thread.

JP 2004-167007 A

  However, the conventional upper thread clamp device has a problem in that a loop passing through the thread catching portion may be formed by sewing the tip end side of the thread end portion of the clamped upper thread into the seam on the back of the fabric. It was.

  When such a loop is formed, the loop cannot be removed from the yarn catching portion, that is, if the thread end portion of the upper thread does not come off from the yarn catching portion, the fabric shift (sewing shape shift), the thread breakage, the device In this case, a stable seam cannot be obtained.

  Here, the back of the fabric refers to a surface on the throat plate side of the fabric as a sewing object placed on the throat plate at the time of sewing.

  The fact that the upper thread loop does not come off from the thread catching section will be described in detail with reference to FIGS.

  In the conventional needle thread clamp device 101, when the first needle drop (first stitch) at the start of sewing is performed, the sewing needle N moves along the vertical movement path NL. At this time, the sewing needle N is a cloth placed on the needle plate P disposed in the bed portion MB in a state where the upper thread T is inserted into the threading hole Na provided near the tip. C is pierced and descends below the needle hole Pa of the needle plate P. The lowering of the sewing needle N is performed through a flat rectangular thread catching portion 103 (through hole) provided in the first clamping member 102. When the sewing needle N is raised, an upper thread loop TL is formed. The upper thread loop TL is scooped with the sword tip Ka of the hook K, so that the tip Ta is in a suspended state, and the upper thread T is captured inside the thread capturing portion 103. The thread catching portion 103 is separated to the side of the vertical movement path NL of the sewing needle N after catching the upper thread T, and then the first clamping portion 104 constituting a part of the inner surface 103a of the thread catching portion 103. And an upper thread T between the second clamping part 106 (disposed so as to face the first clamping part 104) provided in the second clamping member 105 (see FIG. 25).

  In this state, when a predetermined number of stitches are dropped, for example, when the sewing needle N moves up and down by one stitch (second stitch) or two stitches (second and third stitches), the upper thread T A seam S is formed on the fabric C which is knotted and placed on the needle plate P. The upper thread that is clamped between the first clamping part 104 and the second clamping part 106 before the needle drop (third or fourth stitch) after the upper thread T and the lower thread are knotted. T is released, and the stitches S are sequentially formed in this state. Further, the tip Ta of the upper thread T comes out of the thread catcher 103 by feeding the fabric C as the sewing progresses.

  Here, the thread end TA, which is the part of the upper thread T that has been clamped between the first clamping part 104 and the second clamping part 106 at the first stitch and has passed through the thread catching part 103, is the upper thread loop of the second stitch and thereafter. When it is positioned on the TL pulling path, for example, on the passing path of the sword tip Ka of the hook K, the thread end TA enters the inside of the second thread upper thread loop TL (FIG. 26).

  At this time, the length of the yarn end TA of the upper thread T clamped between the first clamping unit 104 and the second clamping unit 106, more specifically, the length from the clamping part of the upper thread T to the tip Ta (hereinafter referred to as the following) , “Thread end length”) is longer than the distance from the pinching point of the upper thread T to the needle drop point DP of the fabric C, the thread end TA of the upper thread T is the upper thread loop TL. When the upper thread T is pulled up by a balance (not shown), the thread end TA of the upper thread T is pulled up together with the upper thread loop TL (FIG. 27).

  Therefore, when the lifting of the upper thread T is completed, the tip Ta side of the thread end TA of the upper thread T that has passed through the thread catching portion 103 is sewn into the seam S on the back of the fabric, and the loop W passing through the thread catching portion 103 is reached. (This is different from the upper thread loop TL used for forming the seam S) (FIG. 28).

  The loop W separates the first clamping unit 104 and the second clamping unit 106 from each other, so that even when the clamped upper thread T is released, the loop catching unit 103 does not come off from the yarn capturing unit 103. Therefore, the fabric C is pulled or pulled by the increase in the number of stitches, that is, the feeding of the fabric C as the sewing proceeds, so that the fabric shift (sewing shape shift), Thread breakage, device malfunction, etc. occur.

  Further, in the conventional thread clamp device 101, when the “thread end length” of the upper thread T is longer than the distance from the clamping position of the upper thread T to the needle drop point DP of the fabric C, the clamping time is long. As the (number of stitches) increases, the upper thread loop TL passes repeatedly, so that the thread end TA is pulled up and the frequency of sewing is increased.

  Accordingly, there is a need for an upper thread clamp device that can avoid the formation of a loop that passes through the thread catching portion by sewing the tip end side of the thread end portion of the upper thread being clamped into the seam on the back of the fabric. .

  The present invention has been made in view of this point, and avoids the formation of a loop that passes through the thread catching portion by sewing the tip end side of the thread end portion of the upper thread that is being held into the seam on the back of the fabric. An object of the present invention is to provide an upper thread grip device for a sewing machine that can handle the above.

In order to achieve the above-mentioned object, the upper thread gripping device of the sewing machine according to claim 1 of the present invention is characterized by the upper thread clamping means for capturing and clamping the thread end of the upper thread, Driving means for driving the upper thread clamping means, and at the beginning of sewing, the thread end of the upper thread inserted through the threading hole of the sewing needle is positioned below the needle plate of the bed section and The sewing machine is formed so that it is captured and clamped at a position separated from the vertical movement path of the sewing needle, and then the needle end of the upper thread that has been clamped is released after the preset number of stitches has been dropped. In the upper thread gripping device, when the upper thread clamping means captures and clamps the upper thread, the thread end of the upper thread that hangs down from the position where the upper thread is clamped by the upper thread clamping means is separated from the lifting path of the upper thread loop. thread wiping means for thread wiper to is provided with, The above-described thread clamping means includes a thread catching portion formed in a frame shape through which the threading hole of the sewing needle that passes through the needle hole of the needle plate can pass, and the thread wiper means A yarn wiping body that is normally moved away from the yarn catching portion by the urging force of the urging means, and a yarn wiping operation member that is in contact with and separated from the yarn wiping body. And the thread wiper actuating member is brought into contact with the thread wiper main body so that the thread wiper main body is actuated to perform thread wipe . And, by adopting such a configuration, the yarn wiping means allows the thread end portion of the upper thread to hang down from the upper thread clamping portion by the upper thread clamping means when the upper thread clamping means captures and clamps the upper thread. Can be separated from the pulling path of the upper thread loop, so that it is possible to avoid the formation of a loop that passes through the thread catching portion by sewing the tip end side of the thread end portion of the upper thread that is being held into the seam on the back of the fabric. . Further, the thread wiping operation can be reliably performed by capturing the upper thread by a simple operation of bringing the thread wiping operation member into contact with the thread wiping body.

According to a second aspect of the present invention, the upper thread gripping device of the sewing machine according to the present invention is characterized in that, in the first aspect, the upper thread clamping means includes a first clamping part provided in the thread catching part. And a second clamping member provided with a second clamping part that is disposed so as to be able to contact and separate relative to the first clamping part and clamps the yarn end part between the member and the first clamping part. The drive means has at least the inside of the yarn catching portion positioned on the vertical movement path, and the first clamping section and the second clamping section are opposed to both sides via the vertical movement path. The initial position, the first clamping part and the second clamping part are spaced apart from each other in the vertical movement path, and the yarn end part is clamped between the first clamping part and the second clamping part. The upper thread clamping means is configured to be drivable so that two positions of the clamping position can be selectively taken, and the thread A main body is provided on the first clamping member, the thread wiper operating member is provided on the driving means, and the thread wiper main body includes the first clamping part and the second clamping part. It is in the point formed so that it may operate in conjunction with the operation at the time of pinching. By adopting such a configuration, a separate drive source is not required to operate the yarn wiper, so that the configuration of the yarn wiper can be simplified, and the first clamping member The yarn can be reliably wiped regardless of the variations in the operation and the parts accuracy.

According to a third aspect of the present invention, the upper thread gripping device of the sewing machine of the present invention is characterized in that, in the first aspect, the upper thread clamping means includes a first clamping part provided in the thread catching part. And a second clamping member provided with a second clamping part that is disposed so as to be able to contact and separate relative to the first clamping part and clamps the yarn end part between the member and the first clamping part. The drive means has at least the inside of the yarn catching portion positioned on the vertical movement path, and the first clamping section and the second clamping section are opposed to both sides via the vertical movement path. The initial position, the first clamping part and the second clamping part are spaced apart from each other in the vertical movement path, and the yarn end part is clamped between the first clamping part and the second clamping part. The upper thread clamping means is configured to be drivable so that two positions of the clamping position can be selectively taken, and the thread A main body is provided in the driving means, the thread wiper operating member is provided in the first clamping member, and the thread wiper main body includes the first clamping part and the second clamping part. It is in the point formed so that it may operate in conjunction with the operation at the time of pinching the thread. By adopting such a configuration, a separate drive source is not required to operate the yarn wiper, so that the configuration of the yarn wiper can be simplified, and the first clamping member The yarn can be reliably wiped regardless of the variations in the operation and the parts accuracy. In addition, even if the upper thread is a thick thread or the like, stable thread wiping can be reliably performed.

According to the upper thread gripping device of the sewing machine according to the present invention, the thread wiping means is a thread of the upper thread that hangs down from the upper thread clamping part by the upper thread clamping means when the upper thread clamping means catches and clamps the upper thread. Since the end portion can be pulled away from the upper thread loop pulling path, it is possible to prevent the thread end portion of the held upper thread from entering the upper thread loop. As a result, it is possible to obtain an excellent effect such that it is possible to avoid the formation of a loop passing through the thread catching portion by sewing the tip end side of the thread end portion of the upper thread that is sandwiched into the seam on the back of the fabric. In addition, the simple operation of bringing the yarn wiping operation member into contact with the yarn wiping main body has an excellent effect that the upper yarn is captured and the yarn wiping operation can be executed reliably. Further, according to the upper thread gripping device of the sewing machine according to the present invention, the upper thread clamping means is relative to the first clamping member including the first clamping part provided in the thread catching part and the first clamping part. And a second clamping member having a second clamping part that is arranged so as to be able to contact with and separate from the first clamping part and clamps the yarn end part between the first clamping part and the driving means at least inside the yarn catching part Is located on the vertical movement path and the first clamping part and the second clamping part are opposed to both sides via the vertical movement path, and the first clamping part and the second clamping part are on the vertical movement path side. The upper thread clamping means is configured to be drivable so as to be able to selectively take two positions, that is, a clamping position where the thread end is clamped between the first clamping part and the second clamping part. The thread wiper body is provided on the first clamping member, the thread wiper operating member is provided on the driving means, and the thread wiper body is the first clamping part. Since the second clamping unit is configured to operate in conjunction with the operation when the upper thread is clamped, a separate drive source is not required to operate the thread cleaning unit. The configuration can be simplified, and excellent effects can be obtained such that the yarn can be reliably wiped regardless of the variation in the operation of the first clamping member and the component accuracy. Furthermore, according to the upper thread gripping device of the sewing machine according to the present invention, the upper thread clamping means is relative to the first clamping member having the first clamping part provided in the thread catching part and the first clamping part. And a second clamping member having a second clamping part that is arranged so as to be able to contact with and separate from the first clamping part and clamps the yarn end part between the first clamping part and the driving means at least inside the yarn catching part Is located on the vertical movement path and the first clamping part and the second clamping part are opposed to both sides via the vertical movement path, and the first clamping part and the second clamping part are on the vertical movement path side. The upper thread clamping means is configured to be drivable so as to be able to selectively take two positions, that is, a clamping position where the thread end is clamped between the first clamping part and the second clamping part. The thread wiper body is provided in the driving means, the thread wiper operating member is provided in the first clamping member, and the thread wiper body is Since the part and the second clamping part are formed so as to operate in conjunction with the operation when the upper thread is clamped, a separate drive source is not required to operate the thread cleaning means. The structure of the means can be simplified, the yarn can be reliably wiped regardless of the variations in the operation of the first clamping member and the component accuracy, and stable even if the upper thread is a thick thread, etc. It has an excellent effect such as being able to surely perform the thread wiping.

  The present invention will be described below with reference to embodiments shown in the drawings.

  For convenience of explanation, a sewing machine provided with an upper thread gripping device of the sewing machine of the present embodiment (hereinafter simply referred to as an upper thread gripping device) will be described first with reference to FIGS.

  FIGS. 1 to 3 show a sewing machine equipped with a needle thread gripping device according to the present invention, FIG. 1 is a partially cut external view of the main part, and FIG. 2 is an enlarged view of the main part near the hook. FIG. 3 is a block diagram showing a configuration of a main part of FIG.

  The sewing machine according to the present embodiment has a basic configuration of a cylinder bed sewing machine in which the distal end portion of the bed portion is formed in a substantially cylindrical shape, and the width in the X-axis direction to be described later is set narrower than other portions. It is.

  As shown in FIG. 1, the sewing machine 1 of the present embodiment includes a bed portion 2, a connecting body portion 3 that protrudes upward and is provided on the rear portion of the bed portion 2 on the right side of FIG. It is formed in a substantially U-shape as a whole having an arm portion 4 provided so as to extend in parallel with the bed portion 2 from the upper portion of the connecting body portion 3 toward the front shown on the left side of FIG. Yes.

  Here, for convenience of explanation, the vertical movement direction of the sewing needle N, which will be described later, is the Z-axis direction, the longitudinal direction of the bed part 2 and the arm part 4 is the Y-axis direction, and the Z-axis direction and The direction orthogonal to both the Y-axis directions is taken as the X-axis direction.

  When the sewing machine 1 is installed on a horizontal plane, the + side in the Z-axis direction is up, the-side is down, the + side in the X-axis direction is left, the-side is right, and the + side in the Y-axis direction is front. The following explanation will be made with the minus side as the latter.

  The sewing machine 1 is provided at the distal end portion of the arm portion 4, and a sewing needle N that reciprocates in the vertical direction by the driving force of the sewing machine motor 5 and an upper portion of the arm portion 4, and an upper thread T is applied to the sewing needle N. An upper thread supply source (not shown) for supplying, and a thread tension device that holds the upper thread T between the upper thread supply source and the sewing needle N with a predetermined load and generates resistance in movement in the feeding direction. 6, a balance device that pulls the upper thread T by the balance 7 at a predetermined timing between the thread tension device 6 and the sewing needle N, and a top portion of the sewing needle N that is provided on the upper surface of the bed portion 2. A needle plate 8 provided with a needle hole 8a (FIG. 2) to be inserted, and provided in the bed portion 2 and below the needle plate 8, scooping the upper thread loop TL from the lowered sewing needle N, A vertical half rotary hook for inserting a lower thread (not shown) into the upper thread loop TL is provided. An upper thread clamp device 10 (hereinafter simply referred to as an upper thread gripper) that holds the thread end TA of the upper thread T when the first stitch of the sewing needle N is raised between the mechanism 9, the needle plate 8 and the shuttle mechanism 9. A gripping device 10), a thread cutting device (not shown) that is provided inside the bed portion 2 and cuts the upper thread T and the lower thread after sewing, and a control means 11 that controls the operation of each part (FIG. 3). And have.

  The sewing needle N is formed with a threading hole Na (eye hole: FIG. 2) slightly above the tip shown in the lower part of FIG. 1, and the upper thread T is inserted into the threading hole Na. ing. Further, the base end portion of the sewing needle N shown in the upper part of FIG. 1 is detachably attached to the lower end portion of the needle bar 12 via a needle clamp (not shown). The needle bar 12 is disposed on the free end side of the arm portion 4 on the left side in FIG. 1, and the lower end portion of the needle bar 12 extends from the lower surface on the free end side of the arm portion 4 to the needle drop of the bed portion 2. The position, more specifically, the needle plate 8 is disposed so as to protrude toward the needle hole 8a. The needle bar 12 is connected to a needle bar driving mechanism (not shown). The needle bar driving mechanism rotationally drives the needle bar 12 with the sewing needle N attached to the lower end portion by the driving force of the sewing machine motor 5. In synchronization with the rotation of the sewing machine main shaft (not shown), it is configured to reciprocate up and down at a predetermined cycle and with a predetermined stroke.

  The sewing machine motor 5 is provided with an encoder 13 (FIG. 3) for detecting the rotational phase angle. The output of the current sewing machine motor 5 is defined as 0 ° when the sewing needle N is located at the top dead center. Which angle position of the axis is 0 to 360 ° is output to the control means 11.

  The balance 7 is provided with a guide hole (not shown) through which the upper thread T is inserted. When the upper thread T is inserted, the balance 7 is moved up and down to be inserted into the threading hole Na of the sewing needle N. The upper thread T is pulled up. The balance device moves the balance 7 up and down at the same cycle as the sewing needle N, but the timing at which the balance 7 is positioned at the top dead center is slightly delayed from the time when the sewing needle N is positioned at the top dead center. Is set.

  As shown in FIG. 2, the shuttle mechanism 9 performs a swinging motion (a reciprocating half-rotating motion in which a half-rotating motion in the forward rotation direction and a half-rotating motion in the reverse rotation direction are alternately repeated) along the circumferential direction. An inner hook 16 that captures the upper thread loop TL by the protruding sword tip 15, a cauldron 17 that rotatably supports the inner hook 16, an upper thread guide plate 18 provided on the upper part of the cauldron 17, and the connecting body 4 A hook shaft 19 that extends in parallel with the longitudinal direction of the bed portion 2 from the arrangement side toward the cauldron 17 and applies a swinging driving force to the inner hook 16 via a driver (not shown) (only a part is shown in FIG. 1). And have. The shuttle shaft 19 is configured such that the drive force branched from the sewing machine motor 5 is converted into a swing drive force and transmitted, so that the sewing needle N reciprocates in the vertical direction and the center shuttle 16 swings. The dynamic motion is synchronized with a predetermined phase difference. The upper thread guide plate 18 is in contact with the race surface of the inner hook 16 of the upper thread T and the sliding surface between the inner hook 16 and the cauldron 17 (contact between the race surface of the cauldron 17 and the race surface of the inner hook 16). It is a plate-like member for preventing intrusion into the surface.

  As shown in FIG. 3, although not shown in detail, the control means 11 stores a CPU (which may be an MPU) for performing various arithmetic processes and various programs for various processes such as control and determination, It has a stored ROM and a RAM used as a work memory in various processes. Further, a non-volatile memory is provided as necessary for rewriting data. The control means 11 includes a sewing machine motor 5, an encoder 13, a thread gripping motor 58 as a drive source of a drive means 27 described later, a thread trimming motor 20 of a thread trimming device, and the like, via a system bus and a drive circuit. The first state sensor 66 and the second state sensor 67 of the moving position detecting means 56, the start / stop switch 21 for inputting start and stop of sewing, an operation panel (not shown), a power switch, and the like are connected. Yes.

  The control means 11 can recognize the rotation angle of the sewing machine motor 5 based on the pulse signal input from the encoder 13 provided on the output shaft of the sewing machine motor 5.

  Further, the control means 11 is based on detection signals input from the first state sensor 66 and the second state sensor 67, and each of the upper thread clamping means 26 (hereinafter simply referred to as the clamping means 26) to be described later. The three positions of the moving position, in this embodiment, the initial position, the clamping position, and the releasing position can be confirmed.

  Further, when the sewing start signal is input from the start / stop switch 21, the control unit 11 determines whether the driving unit 27 detects the rotational angle of the sewing machine motor 5 or the operation position detected by the moving position detection unit 56. The drive of the thread clamp motor 58 as a drive source can be controlled.

  Next, an embodiment of the upper thread clamp device according to the present invention will be described.

  4 to 6 show an embodiment of an upper thread gripping device according to the invention. FIG. 4 is a perspective view of the main part, FIG. 5 is an exploded perspective view of the main part of FIG. 4, and FIG. It is an expansion disassembled perspective view of the principal part.

  The upper thread clamp device 10 of the present embodiment reliably forms the seam S (see FIG. 28) at the start of sewing, that is, the thread end TA of the upper thread T at the start of sewing is pulled out from the fabric C (see FIG. 25). In order to prevent this, the thread end TA of the upper thread T inserted through the first sewing needle N at the start of sewing is placed below the needle plate 8 and the vertical movement path NL of the sewing needle N (FIG. 2). ) Is captured and clamped at a position separated from the head), and then the needle end TA of the clamped upper thread T is released after a predetermined number of needles are dropped.

  As shown in FIGS. 4 and 5, the upper thread gripping device 10 of the present embodiment has a first clamping part 24 that is made relatively movable so as to capture and clamp the thread end TA of the upper thread T. And it has the clamping means 26 which comprises the 2nd clamping part 25, and the drive means 27 for driving this clamping means 26. The driving unit 27 further includes a moving unit 28 and a related operation unit 29. Further, the upper thread clamp device 10 of this embodiment has a thread wiper 30.

  The moving means 28 has an initial position (FIGS. 7 to 10) where the clamping means 26 is positioned on the vertical movement path NL of the sewing needle N, and a vertical movement path NL (in the Z-axis direction) of the sewing needle N from this initial position. A clamping position (parallel to the path connecting the tip position of the sewing needle N at the bottom dead center to the tip position of the sewing needle N at the top dead center) rearward (connected to the body side) (FIG. 13, FIG. 14) and a release position (FIGS. 15 and 16) spaced further rearward (connecting body side) than the clamping position, and moved from the initial position to the clamping position at the start of sewing. After stopping for a predetermined number of stitches, the needle is moved from the clamping position to the release position.

  The related operation means 29 arranges the second clamping part 25 at a position closer to the connecting body part than the vertical movement path NL of the sewing needle N and the first clamping part 24 when the clamping means 26 is located at the initial position. The sewing needle N is disposed at a position opposed to the clamping part 31 across the vertical movement path NL of the sewing needle N, and the first clamping part 24 and the second clamping part 25 approach when the clamping means 26 moves from the initial position to the clamping position. The second end portion 25 is separated from the first end portion 24 when the end portion TA of the upper thread T is clamped and the end portion 26 is moved to the release position. The first clamping portion 24 and the second clamping portion 25 are mechanically interlocked with the movement of the moving means 28 so as to release the yarn end portion TA of the upper yarn T.

  That is, the drive unit 27 of the present embodiment is configured so that the clamping unit 26 can be operated so as to be able to selectively take the three positions of the initial position, the clamping position, and the release position.

  As the driving means 27, instead of the moving means 28 and the related operation means 29, the entire clamping means 26 is moved to the initial position, the clamping position, and the release position by the driving force of the first actuator (the initial position and the clamping position). 2), and the first clamping unit 24 and the second clamping unit 25 are moved relative to each other by the driving force of the second actuator. You may use together with the structure to make.

  The yarn wiping means 30 has a thread end TA of the upper thread T that hangs down from a position where the upper thread T is clamped by the clamping means 26 when at least the clamping means 26 moves to the clamping position and catches and clamps the upper thread T. The thread is wiped away from the pulling path of the upper thread loop TL, and is mechanically interlocked with the operation of the clamping means 26.

  As shown in FIGS. 4 and 5, the clamping means 26 of the present embodiment includes a first clamping member 31 having a first clamping part 24 and a second clamping member 32 having a second clamping part 25. doing. Each of these members 31 and 32 has a long plate shape as a whole, and they are overlapped with the second clamping member 32 as the top, and all have their longitudinal directions oriented parallel to the Y-axis direction. Both are supported by the related operation means 29 so that both can slide along the Y-axis direction (front-back direction) in the state.

  Hereinafter, when words indicating directions are used in the description of each part of the clamping means 26, the direction in the state where the clamping means 26 is supported by the related operation means 29 is indicated unless otherwise specified. .

  As shown in FIG. 5 and FIG. 6, the first clamping member 31 is provided with a yarn catching portion 33 at a tip portion located on the Y axis direction + side. The thread catching portion 33 is formed in a frame shape through which the threading hole Na of the sewing needle N penetrating the needle hole Pa of the needle plate P can pass through the inside, in this embodiment, a long rectangular shape along the front-rear direction. Has been. And the 1st clamping part 24 used when clamping the upper thread | yarn T is formed by the front inner surface located in the Y-axis direction + side among the inner surfaces of the thread | yarn capture part 33. As shown in FIG. That is, the first clamping part 24 forms a part of the yarn catching part 33. Further, a thread wiper body attachment for attaching a thread wiper body 83 having a substantially rectangular planar shape of a thread wiper means 30 to be described later to the distal end side of the outer surface located on the X axis direction minus side of the first clamping member 31. The plate portion 34 is formed so as to protrude toward the X-axis direction minus side, and a screw hole 35 penetrating in the vertical direction is formed at a substantially central portion thereof. Further, the stopper 36 is directed downward on the Z-axis direction-side on the rear end side located on the Y-axis direction-side of the outer surface located on the X-axis direction-side of the thread wiper body mounting plate 34. It is extended and formed.

  Two inner side surfaces located on both sides in the X-axis direction of the yarn catching portion 33 of the present embodiment are formed so as to function also as a guide guide for guiding the movement of the second clamping portion 25 of the second clamping member 32 in the front-rear direction. Has been.

  Note that the shape of the yarn catching portion 33 may be a shape other than a flat rectangular shape, for example, the Y-axis direction-side may be a substantially arc shape or a semicircular shape, depending on the design concept and the like. It is not limited to the planar rectangular shape.

  As shown in FIGS. 5 and 6, a flat rectangular through hole 43 that is long in the front-rear direction is formed at the rear end of the first clamping member 31 located on the negative side in the Y-axis direction. As shown in FIG. 5, the through hole 43 is provided with a tension spring 44 of the related operation means 29 described later, and forms an operation region for expanding and contracting. One end of the tension spring 44 is connected to the front end of the through hole 43. In addition, a bracket portion 45 extending toward the X-axis direction − side is provided at a position slightly rearward of the first clamping member 31 in the Y-axis direction, and the tip portion extends downward. A protruding round bar-like engagement pin 46 is fixedly mounted with its tip directed downward. The first clamping member 31 is formed such that a moving force in the front-rear direction by the related operation means 29 is input via the engagement pin 46.

  As shown in FIG. 5, the second clamping member 32 is divided into a front side portion 48 and a rear side portion 49, and these are connected to each other by a connecting body 50 so as to be formed into an integral substantially long plate shape. Has been. A second clamping part 25 is provided at the front end of the front side part 48, and the second clamping part 25 is in contact with the first clamping part 24 constituting a part of the yarn catching part 33. It has a detachable clamping surface 25a and a bent part 25b that passes below the first clamping part 24 and protrudes forward from the front end surface of the first clamping member 31 when contacting the first clamping part 24. .

  Therefore, the upper thread T inserted from above into the yarn catching part 33 of the first clamping member 31 is moved from the first clamping part 24 to the first clamping part 33 by the relative approaching action of the first clamping member 31 and the second clamping member 32. 2 It is formed so that it can be clamped by the clamping surface 25 a of the clamping unit 25. Further, the clamped upper thread T is bent forward by a bent portion 25b extending forward from the lower end of the clamping surface 25a, so that the upper thread T is not lowered from the front to the lower. Be able to. As a result, the yarn end portion TA of the upper thread T hangs down in a state of being more forwardly positioned by the bent portion 25b, so that the position thereof is shifted further forward than the intermediate hook 16 of the hook mechanism 9 positioned below the upper end. Thus, it is formed so as to be able to prevent contact and entrainment with the inner hook 16.

  In addition, as the clamping surface 25a of the 1st clamping part 24 and the 2nd clamping part 25, the shape which the 1st clamping part 24 and the clamping surface 25a of the 2nd clamping part 25 can contact | abut via the upper thread T, For example, it may be formed in a curved shape such as a plane arc.

  The rear side portion 49 has a through hole 51 formed along the front-rear direction. When the second holding member 32 and the first holding member 31 are overlapped with each other and supported by the related operation means 29, the rear side portion 49 has a through hole. 51 overlaps with the through hole 43 of the first clamping member 31 described above, and the tension spring 44 of the related operation means 29 is disposed inside these to form an operation region for expanding and contracting. The other end of the tension spring 44 is connected to the rear end of the through hole 51.

  Accordingly, the second clamping member 32 is connected to the first clamping member 31 via the tension spring 44, and the first clamping part 24 of the first clamping member 31 and the second clamping part 25 of the second clamping member 32 are connected to each other. The urging force is always applied in a direction in which they approach each other and come into contact with each other.

  A bracket portion 52 extending toward the + side in the X-axis direction is provided at an intermediate portion in the Y-axis direction of the rear side portion 49 of the second clamping member 32, and extends downward at the tip portion. A round bar-like engagement pin 53 is fixedly mounted with its tip facing downward. Then, the moving force in the front-rear direction by the related operation means 29 is input to the second clamping member 32 via the engagement pin 53.

  The moving means 28 moves the first clamping part 24 and the second clamping part 25 of the clamping means 26 to an initial position below the vertical movement path NL of the sewing needle N before starting sewing, and starts sewing. After that, when the first sewing needle N is pulled out from the fabric, the sewing needle N is moved to the clamping position behind the initial position with respect to the vertical movement path NL of the sewing needle N, and a predetermined number of needle drops Is performed (for example, 2 to 3 stitches), the sewing needle N is moved to three positions, ie, moved to a release position that is behind the clamping position with respect to the vertical movement path NL.

  Therefore, the moving means 28 includes a Y-axis moving mechanism 55 that reciprocates the holding means 26 supported by the related operation means 29 along the Y-axis direction, and the holding means 26 is in any of the initial position, the holding position, and the release position. A moving position detecting means 56 (FIG. 9) for detecting whether or not the position is present, and a moving positioning control means for controlling the operation of the Y-axis moving mechanism 55 based on the detection by the moving position detecting means 56 are provided.

  As shown in FIG. 5, the Y-axis moving mechanism 55 includes a thread clamp motor 58 that outputs a rotational driving force as a drive source of the drive means 27, and an oscillation center of the thread clamp motor 58 on the output shaft of the thread clamp motor 58. The main link body 59 connected in position, the driven link body 61 that applies a moving force in the Y-axis direction to the relative position adjustment link body 60 of the related operation means 29, and the driving force from the main link body 59 to the driven link body 61. The transmission link body 62 which transmits is provided.

  As the thread gripping motor 58, for example, a stepping motor is used, and is driven at an arbitrary rotation angle amount in the forward and reverse directions by the operation control of the control means 11.

  One end of the main link 59 is fixedly connected to the output shaft of the thread clamp motor 58, and the other end is rotatably connected to one end of the transmission link 62.

  One end of the driven link body 61 is pivotally supported by a guide plate 63 (to be described later) of the related operation means 29, and the other end is rotatably connected to the other end of the transmission link body 62. The substantially U-shaped follower link body 61 is provided with an engagement protrusion 64 for applying a moving force along the Y-axis direction to the relative position adjustment link body 60 of the related operation means 29.

  The transmission link body 62 is disposed substantially along the Y-axis direction, and is configured to swing the driven link body 61 along with the swing of the main link body 59 driven by the thread clamp motor 58.

  With these configurations, when the thread clamp motor 58 is driven, the driven link body 61 swings along with the swing of the main link body 59, and the relative position adjustment link body 60 of the related operation means 29 moves through the engagement protrusion 64. It is formed so as to move along the axial direction.

  The moving position detecting means 56 includes a light emitting element and a light receiving element, and first and second state sensors 66 and 67 for detecting the presence / absence of a shield between them, and the Y-axis moving mechanism described above. 55, and a shielding plate 70 having first and second shielding regions 68 and 69 (see FIG. 9).

  The first and second state sensors 66 and 67 are arranged side by side along the movement line of the shielding plate 70, and the first state sensor 47 is arranged on the rear side. Thereby, each state sensor 66 and 67 will be in the state located in a line along the Y-axis direction substantially. The light receiving elements of the state sensors 66 and 67 are configured to turn on a state with a shielding object, turn off a state without a shielding object, and output a signal that can identify each state to the control unit 11. .

  On the other hand, the shielding plate 70 is fixedly supported by the transmission link body 62 so as to pass between the light emitting element and the light receiving element with respect to both the first and second state sensors 66 and 67. The first shielding area 68 is located between the first state sensor 66 and the second state sensor 67 when the holding means 26 is in the initial position, and the first state sensor 66 is set when the holding means 26 is in the holding position. The position in the Y-axis direction and the length in the Y-axis direction are set so that the first state sensor 66 is still in the position to be shielded when it is in the shielding position and in the release position.

  The second shielding area 69 is located in front of the second state sensor 67 in any case when the clamping means 26 is in the initial position or the clamping position, and is only in the second position when it is in the release position. The Y-axis direction position is set so as to be a position where the state sensor 67 is shielded.

  Therefore, the control means 11 can determine that the clamping means 26 is in the initial position because both the first and second state sensors 66 and 67 are in the OFF state, and that the clamping means 26 is in the clamping position. It can be determined from the fact that the first state sensor is in the ON state and the second state sensor 67 is in the OFF state, and both the first and second state sensors 66 and 67 are in the ON state that the clamping means 26 is in the release position. It can be determined from the state.

  The movement positioning control means is actually realized by the control of the control means 11. Thus, the movement positioning control means may be realized by borrowing a part of the function of the control means 11 for controlling the operation of the entire sewing machine, or may be realized by an independent control means.

  The control means 11 as the movement positioning control means previously determines the rotation angle amount of the thread gripping motor 58 for moving the clamping means 26 from the initial position to the clamping position and the rotation angle amount for moving from the clamping position to the release position. When the holding means 26 is positioned at the second and release positions, the operation of the thread clamp motor 58 is controlled with reference to the stored angular position.

  As for the initial position, the control means 11 performs control (initialization operation processing) as an initial position control section using the movement position detection means 56 when the power to the sewing machine 1 is turned on, and the thread gripping motor 58 is controlled. It is configured to search for a position where both the first and second state sensors 66 and 67 are turned OFF and to stand by at that position.

  When the encoder 13 of the sewing machine motor 5 detects that the output shaft angle is 245 °, for example, at the first stitch after the start of sewing, it recognizes that the sewing needle N has been pulled upward from the fabric C and holds the clamping means 26. Control is performed as an upper thread holding control unit that positions the holding position.

  In the sewing machine 1 of the present embodiment, when the top dead center position of the sewing needle N is set to 0 ° with respect to the output shaft of the sewing machine motor 5, when the sewing needle N rotates to 245 °, the sewing needle N passes through the bottom dead center. It is set so as to come out above the plate 8. Further, when a predetermined number of needle drops after the start of sewing is detected by the output of the encoder 13, control as an upper thread release control unit that positions the clamping means 26 at the release position is performed. Here, the number of stitches is recognized by the output of the encoder 13, for example, by counting the number of signal outputs indicating 180 ° by the encoder 13.

  As shown in FIG. 5, the related operation means 29 includes a guide plate 63 as a guide means for supporting the second holding member 32 and the first holding member 31 so as to be able to reciprocate along the Y-axis direction, and a second holding member. A tension spring 44 as tension urging means for always applying tension between the second clamping member 32 and the first clamping member 31 in a direction in which the portion 25 and the first clamping portion 24 approach each other, and its own swing The second sandwiching portion 25 and the first sandwiching portion 24 can be brought into contact with and separated from each other in accordance with the posture change caused by the engagement, and the second sandwiching member 32 and the first sandwiching member 31 are engaged with each other and sandwiched by the moving means 28. The relative position adjusting link body 60 to which the moving force to each moving position of the means 26 is input, and when the holding means 26 is in the initial position, the second holding portion 25 and the second holding portion 25 come into contact with the relative position adjusting link body 60. 1 The holding part 24 is separated. When the first abutting member 72 swinging in the direction and the clamping means 26 are in the release position, the second clamping unit 25 and the first clamping unit 24 are separated by contacting the relative position adjustment link body 60. And a second contact member 73 that swings in the direction.

  The guide plate 63 is fixed to the upper part of the bed portion 2 and behind the needle plate 8.

  Hereinafter, when words indicating directions are used in the description of each part of the related operation means 29, the direction in a state where the guide plate 63 is fixed to the bed part 2 is indicated unless otherwise specified. .

  On the upper surface of the guide plate 63, a guide groove 75 along the Y-axis direction is provided at an intermediate position in the X-axis direction. In this guide groove 75, the first clamping member 31 and the second clamping member 32 of the clamping means 26 are stored in a state where they are overlapped in the longitudinal direction, and a pressing plate 76 is further provided on the first clamping member 31 from above. The second clamping member 32 is covered so as not to fall off the guide groove 75. Thereby, the first clamping member 31 and the second clamping member 32 are guided by the guide groove 75 and can slide along the Y-axis direction.

  However, as described above, since the first clamping member 31 and the second clamping member 32 are connected via the tension spring 44, each member 31, 32 is connected to the first clamping portion 24 unless an external force is applied. The state where the second clamping unit 25 is in contact with the second clamping unit 25 is maintained.

  Through holes 77 and 78 are provided on both sides of the guide plate 63 with the guide groove 75 in between. In one through hole 77, the engagement pin 46 provided in the first clamping member 31 is fitted from above, and in the other through hole 78, the engagement pin 53 of the second clamping member 32 is fitted. Further, each of the through holes 77 and 78 is an engagement pin in the movement from the initial position to the release position of the holding means 26 and the relative movement of the first holding member 31 and the second holding member 32 accompanying this. The length in the Y-axis direction is set so that the front and rear ends of the holes 77 and 78 do not contact 46 and 53, respectively. The engaging pins 46 and 53 inserted through the through holes 77 and 78 have their tips protruding somewhat from the lower surface side of the guide plate 63 and individually engaged with the relative position adjusting link body 60.

  The relative position adjustment link body 60 is arranged along the longitudinal direction thereof, and the rotation engagement portion 79 with the first clamping member 31, the rotation engagement portion 80 with the second clamping member 32, A rotation engaging portion 81 with the moving means 28 located between them is provided.

  That is, the rotation engagement portion 79 with the first clamping member 31 is a long hole-like through hole along the longitudinal direction of the relative position adjustment link body 60, and the engagement pin 46 is inserted therethrough. The rotation engagement portion 80 with the second clamping member 32 is a circular through hole, and the engagement pin 53 is inserted therethrough. The rotation engaging part 81 with the moving means 28 is a long hole-like through hole along the longitudinal direction of the relative position adjusting link body 60, and the engaging protrusion 64 is inserted therethrough.

  As shown in FIG. 6, the thread wiper 30 includes a thread wiper body 83 and a thread wiper operating member 84 for operating the thread wiper body 83.

  The yarn wiper body 83 has a flat plate-like yarn wiper arm 85 that is long in the front-rear direction, and extends substantially perpendicularly from the rear end of the yarn wiper arm 85 located on the Y-axis direction-side toward the X-axis direction-side. The formed flat input arm 86 forms a bell crank as a whole. Further, a claw portion 85a extending toward the X axis direction + side is formed at the tip of the yarn wiper arm 85, and is formed so as to form a hook shape as a whole. A concave portion 85b as a yarn catching portion by the yarn wiper body 83 is formed at the base of the claw portion 85a, which is a connecting portion between the side surfaces of the claw portion 85a and the yarn wiper arm 85 located on the + side in the X axis direction. Has been. Further, an insertion hole 87 penetrating in the vertical direction is formed in a connecting portion between the yarn wiper arm 85 and the input arm 86. The insertion hole 87 serves as a support pin for supporting the yarn wiper body 83. A functioning mounting step screw 88 is inserted from below.

  The mounting step screw 88 is screwed into the screw hole 35 of the thread wiper body mounting plate portion 34, and the thread wiper body 83 is rotatable about the mounting step screw 88. Further, a torsion coil spring 89 as an urging means is attached to the mounting step screw 88. The torsion coil spring 89 is disposed on the lower surface side of the thread wiper main body 83, and one end thereof is hooked on the rear end surface located on the Y axis direction negative side of the stopper 36 formed on the thread wiper main body mounting plate portion 34. The other end is hung on the front side surface of the drive arm of the thread wiper body 83 located on the + side in the Y-axis direction (FIG. 10).

  In the yarn wiper body 83, the rear end surface of the input arm 86 located on the negative side in the Y-axis direction is normally in contact with the stopper 36 by the biasing force (spring force) of the torsion coil spring 89, and the Z-axis direction. The maximum rotational position in the counterclockwise direction when viewed from above on the + side is regulated, and the thread wiper arm 85 is clockwise (counterclockwise in FIG. 10) along the horizontal plane viewed from above with the mounting stepped screw 88 as the center. It is configured to allow only rotation in the direction). In this state, the yarn wiping arm 85 is disposed substantially parallel to the yarn catching portion 33 on the side located on the X axis direction − side of the yarn catching portion 33, and is positioned away from the yarn catching portion 33. keeping. Further, the claw portion 85a of the yarn wiper arm 85 is disposed on the Y axis direction + side from the tip of the yarn catcher 33, and the yarn wiper body 83 is clockwise when viewed from above with the mounting stepped screw 88 as the center. When rotated, the yarn wiper arm 85 is configured to cross directly below the yarn catching portion 33.

  The yarn wiper operating member 84 is formed in a bar shape that protrudes in the Y-axis direction + side near the X-axis direction − side from the center portion of the front end surface located on the Y-axis direction + side of the guide plate 63. Further, the tip of the yarn wiper operating member 84 is disposed at a position facing the tip side portion located on the X-axis direction-side of the side surface located on the Y-axis direction-side of the input arm 86 of the yarn wiper main body 83. Yes. Of course, the yarn wiper operating member 84 is disposed at a position where it does not interfere with the stopper 36.

  The yarn wiper operating member 84 is not limited to the guide plate 63, and may be disposed at other fixed portions such as the bed portion 2.

  Further, the thread wiper operating member 84 has its tip abutted against the input arm 86 in the middle of the clamping means 26 reaching the clamping position from the initial position to start the rotation of the thread wiper main body 83, and the clamping means 26 moves the clamping position. When the release position is reached, the rotation of the thread wiper body 83 is completed. The rotation angle for rotating the yarn wiper main body 83 is such that the yarn end TA of the upper yarn T hanging from the pinched portion of the upper yarn T by the first clamping portion 24 and the second clamping portion 25 is pulled up by the upper yarn loop TL. It is comprised so that it may be set as the angle which can be spaced apart from.

  Therefore, the yarn wiper operating member 84 may be configured such that the position of the tip on the Y axis direction + side can be adjusted along the Y axis direction. For example, there is a configuration in which a thread portion is formed at the base end portion of the yarn wiper operating member 84, and the thread amount when the thread portion is threaded into a screw hole provided in the guide plate 63 or other fixed portion is changed. be able to. By adopting such a configuration, the accuracy of parts can be reduced and the cost can be reduced, and the rotation timing and opening angle of the thread wiper body 83 can be adjusted in detail, and fine settings can be made for the thickness and strength of the upper thread T. This makes it possible to prevent thread breakage and further improve the quality of the sewn product.

  Other configurations are the same as those of the conventional sewing machine equipped with the upper thread clamp device, and thus detailed description thereof is omitted.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  7 to 16 are explanatory views for explaining the operation in the embodiment of the upper thread clamp device according to the present invention. FIG. 7 is a front view of the main part in a state where the upper thread clamping means of the thread clamp device is located at the initial position. 8 is a partially enlarged view of the main part of the upper thread clamping means of FIG. 7, FIG. 9 is a bottom view of the main part of the upper thread gripping device of FIG. 7, and FIG. 10 is a partially enlarged view of the main part of FIG. FIG. 11 is an explanatory view showing an operating state in which the upper thread clamping means of the upper thread gripping device has reached the position where the thread wiper starts operating at an intermediate position between the initial position and the clamping position, and FIG. 12 is a main portion of FIG. 13 is an explanatory view of a main part in an operating state in which the upper thread clamping means of the upper thread gripping device is located at the clamping position, FIG. 14 is a bottom view of the main part of FIG. 13, and FIG. 15 is an upper thread gripping apparatus. FIG. 16 is a bottom view of the main part of FIG. 15 in an operation state in which the upper thread clamping means is located at the release position. In FIGS. 7 to 16, only the main parts are denoted by reference numerals.

  As shown in FIGS. 7 to 10, when the power switch of the sewing machine 1 according to this embodiment is turned on, the control unit 11 performs an initialization operation to position the clamping unit 26 at the initial position. Therefore, the clamping means 26 is located on the vertical movement path NL of the sewing needle N, the first clamping part 24 is located in front of the vertical movement path NL of the sewing needle N, and the second clamping part 25 is behind the straight line M. Is located. In the state where the clamping means 26 is positioned at the initial position, the yarn wiper 30 has the tip of the yarn wiper operating member 84 separated from the input arm 86 of the yarn wiper main body 83 in the Y-axis direction minus side, and the torsion coil The yarn wiping arm 85 is in contact with the stopper 36 by the urging force of the spring 89. As a result, the yarn wiper arm 85 is positioned with its longitudinal direction approximately in the front-rear direction, and the yarn wiper arm 85 is located on the side of the yarn catcher 33 on the negative side in the X axis direction. The yarn wiper main body 83 is held at a position spaced from the yarn catching portion 33. Note that the control means 11 receives the OFF signals from the first and second state sensors 66 and 67 to determine that the clamping means 26 has been positioned at the initial position.

  Next, when receiving the sewing start signal from the start / stop switch 21, the control means 11 detects the initial position by the movement position detection means 56. When it is detected that the signals from the first and second state sensors 66 and 67 are both OFF, the driving of the sewing machine motor 5 is started. As a result, the sewing needle N passes through the needle hole 8a of the throat plate 8, and the upper thread T passes inside the thread catching portion 33 that is closed and between the first clamping portion 24 and the second clamping portion 25. pass. Further, below that, the upper thread loop TL beside the sewing needle N is captured by the sword tip 15 of the shuttle mechanism 9 that is driven. Then, the upper thread loop TL is widened by the rotation of the inner hook 16 and the upper thread guide plate 18, but at this time, the tip end portion of the second clamping portion 25 is positioned sufficiently rearward, so that the upper thread guide plate 18 Does not block the expansion of the upper thread loop TL. Therefore, the upper thread T is prevented from contacting the race surface 22 of the inner hook 16 located rearward. At this time, the yarn wiper main body 83 holds a position separated from the yarn catching portion 33.

  Next, it is judged from the detection angle of the encoder signal whether or not the first sewing needle N has come out of the fabric C from the encoder 13 of the sewing machine motor 5 and the balance 7 has reached the top dead center. When the balance 7 indicates that the top dead center has been reached, the control means 11 performs operation control to start driving so that the thread gripping motor 58 of the moving means 28 moves the clamping means 26 to the clamping position. That is, referring to the storage of the rotation angle amount corresponding to the movement amount from the initial position to the clamping position set in advance, the thread gripping motor 58 is driven in accordance with this.

  Thereby, the clamping means 26 starts to move from the initial position toward the clamping position. At this time, the relative position adjustment link body 60 of the related operation means 29 starts swinging along the X-axis direction by the urging force of the tension spring 44, so that the first clamping portion 24 moves rearward and the second clamping The part 25 moves forward.

  The thread end TA of the upper thread T is clamped by the first clamping part 24 and the second clamping part 25 after the balance 7 reaches the top dead center because the balance 7 with respect to the upper thread T is at the top dead center of the scale 7. The upper thread T located below the needle hole 8a is in the shortest state because the pulling of the upper thread T is completed. When the upper thread T is clamped by the first clamping part 24 and the second clamping part 25 at this time, the upper thread T is clamped. This is because the “thread end length” that is the length of the upper thread T from the portion to the end can be made the shortest.

  Next, as shown in FIGS. 11 and 12, the yarn wiper operating member of the yarn wiper 30 is moved by the rearward movement of the first clamping unit 24 while the clamping unit 26 is moving from the initial position toward the clamping position. The tip of 84 abuts on the side surface of the input arm 86 of the yarn wiper main body 83 located on the negative side in the Y-axis direction. Further, since the input arm 86 is pushed by the yarn wiper operating member 84 due to further rearward movement toward the clamping position of the first clamping unit 24, the yarn wiper main body 83 resists the biasing force of the torsion coil spring 89. Rotation is started along the horizontal plane with the mounting stepped screw 88 as the center in the counterclockwise direction of FIG. 12 (clockwise when viewed from above), that is, the tip side of the thread wiper arm 85 faces the thread catching portion 33. Accordingly, the yarn wiper main body 83 operates in conjunction with the operation when the first clamping portion 24 and the second clamping portion 25 clamp the upper thread T.

  Next, when the thread gripping motor 58 corresponding to a preset rotation angle amount is driven and stopped, as shown in FIGS. 13 and 14, the clamping means 26 reaches the clamping position and the first clamping The part 24 moves backward, the second clamping part 25 moves forward, approaches each other, and the clamping surfaces 25a of the first clamping part 24 and the second clamping part 25 come into contact with each other. Thereby, the yarn end portion TA of the upper yarn T inserted between them is clamped. In practice, the clamping surface 25a of the first clamping part 24 and the second clamping part 25 is brought into contact with the clamping means 26 while it reaches the clamping position. Note that the control means 11 receives the ON signal from the first state sensor 66 and the OFF signal from the second state sensor 67 to detect that the holding means 26 has reached the clamping position and is positioned. The movement to the clamping position is completed while the needle tip of the sewing needle N is above the needle plate 8.

  At this time, the yarn wiper 30 rotates around the attachment step screw 88 so that the tip end side of the yarn wiper arm 85 faces the yarn catching portion 33. Therefore, as shown in FIG. A trajectory is taken across the yarn path V connecting the pinching portion of the upper thread T between the pinching portion 24 and the second pinching portion 25 and the shuttle K. Further, the claw portion 85a of the thread wiper main body 83 passes through the vertical movement path NL of the sewing needle N without crossing, and therefore does not interfere with the sewing needle N.

  As a result, the yarn wiper 30 catches and hooks the yarn end TA of the upper yarn T hanging from the pinching portion of the upper yarn T by the pinching device 26 at the recess 85b of the yarn wiper arm 85 immediately below the yarn catching portion 33. The yarn is wiped in the X-axis direction-side and in the Y-axis direction-side. With this thread wiping, the thread wiping body 83 in the yarn end TA, which is the portion of the upper thread T that has been nipped between the first nipping portion 24 and the second nipping portion 25 at the first stitch and that has passed through the yarn catching portion 33. The hanging thread end TA located further downward moves away from the pulling path of the second thread upper thread loop TL. This yarn wiper also moves away from the hook K so that the yarn end TA located below the yarn wiper main body 83 does not get on the passage path of the hook tip Ka of the hook K.

  Since the yarn end portion TA of the upper thread T is moved to the X axis direction-side and the Y axis direction-side by the thread wiper 30, it is assumed that the upper thread loop TL is temporarily pulled up. However, the tip Ta side of the thread end TA of the upper thread T is not sewn into the seam S on the back of the fabric.

  Next, when a preset number of needle drops (for example, two needle drops) is performed, the control unit 11 rotates according to the amount of movement from the preset clamping position to the release position. The thread gripping motor 58 is driven in response to the storage of the quantity.

  Thereby, the clamping means 26 starts to move from the clamping position toward the release position. Then, the sliding contact portion 60 a of the relative position adjustment link body 60 of the related operation means 29 comes into sliding contact with the second contact member 73 while the sandwiching means 26 approaches the release position. When the movement of the clamping means 26 is further continued, the relative position adjustment link body 60 swings against the urging force of the tension spring 44, and the second clamping part 25 is largely rearward than the first clamping part 24. Moving. Accordingly, the clamping state of the yarn end TA of the upper thread T is released, and the clamping means 26 reaches the release position while the yarn end TA of the upper thread T is released from the clamping means 26. Note that the control means 11 receives the ON signals from the first and second state sensors 66 and 67 to detect that the clamping means 26 has reached the release position and is positioned.

  When the clamping means 26 reaches the release position, as shown in FIGS. 15 and 16, the thread wiper 30 is arranged so that the front end side of the thread wiper arm 85 is directed to the thread catcher 33 around the mounting step screw 88. Furthermore, the yarn end TA of the upper thread T that is further rotated and hangs down from the position where the upper thread T is clamped by the clamping means 26 is hooked by the recess 85b of the thread wiper arm 85 directly below the thread catching section 33, and on the X axis direction − side, and The yarn is further wiped in the Y-axis direction minus side to complete the yarn wipe (further away from the vertical movement path NL of the sewing needle N).

  In the upper thread clamp device 10 of the present embodiment, the thread wiper 30 is operated between the intermediate position between the initial position of the clamping means 26 and the clamping position and the release position. This is because the upper thread T is prioritized to be stably clamped at the position, and the upper thread T is not disturbed in the clamping, for example, between the initial position and the clamping position and the clamping position. You may form so that operation | movement of the payment means 30 may be completed.

  Further, as a clamping position, the first clamping part 24 and the second clamping part 25 are separated from each other in the vertical movement path NL, that is, the first clamping part 24 and the second clamping part 25 are moved up and down by the sewing needle N. Any position that deviates from the path NL and does not interfere with the sewing needle N may be used.

  Further, the yarn end TA of the upper yarn T may be clamped while moving from the initial position to the clamping position.

  When the clamping means 26 is moved to the release position and positioned, the first clamping part 24 and the second clamping part 25 may be separated by a distance that allows the upper thread T to be released.

  The release position may be a position where the first clamping part 24 and the second clamping part 25 are separated from the vertical movement path NL of the sewing needle N and do not interfere with the sewing needle N. It is set behind the clamping position so as not to interfere with the mechanism.

  The upper thread gripping device 10 does not provide the release position individually, and performs both the clamping and releasing of the thread end TA of the upper thread T at the same position as the clamping position, that is, the clamping position. It may be configured.

  Thus, according to the upper thread clamp device 10 of the present embodiment, when the clamping means 26 captures and clamps the upper thread T, the thread end of the upper thread T that hangs down from the position where the upper thread T is clamped by the clamping means 26. Since the thread wiper 30 is provided to wipe the part TA away from the pulling path of the upper thread loop TL, the front end Ta side of the thread end TA of the upper thread T being clamped is the seam S on the back of the fabric. It is possible to reliably and easily avoid the formation of the loop W that passes through the thread catching portion 33 by being sewn into the thread.

  Therefore, according to the upper thread clamp device 10 of the present embodiment, it is possible to easily and reliably prevent the occurrence of fabric shift, thread breakage, malfunction of the device, and the like, and ensure high sewing product quality. be able to.

  Further, according to the upper thread clamp device 10 of the present embodiment, the sewing conditions are such that the “insertion length” that is the length from the threading hole Na to the tip Ta of the upper thread T at the start of sewing changes. However, since the thread clamp device 10 can be used, there are secondary effects that the quality of the sewing product can be improved and the sewing start speed (productivity) can be maintained and implemented.

  Furthermore, according to the upper thread clamp device 10 of this embodiment, since the thread clamp device 10 can be used regardless of the “insertion length”, the adjustment of the thread take-up spring that affects the “insertion length” and the thread path component There is also a secondary effect that productivity is improved because it is not necessary to replace (gauge).

  Further, according to the upper thread clamp device 10 of the present embodiment, the thread wiper 30 is made movable along the horizontal plane, and the thread of the clamping means 26 is always applied by the urging force of the torsion coil spring 89 as the urging means. It has a thread wiper main body 83 that holds a position separated from the catching portion 33 and a thread wiper operating member 84 that is brought into contact with and separated from the thread wiper main body 83. The thread wiper operating member 84 is brought into contact with the thread wiper main body 83. Accordingly, the thread wiper body 83 is operated to perform the thread wiper, so that the thread wiper operating member 84 is brought into contact with the thread wiper body 83, and the upper thread T is captured and the thread wiper is removed. The operation can be executed more reliably.

  Further, according to the upper thread clamp device 10 of the present embodiment, the thread wiper main body 83 is provided in the first clamping member 31, the thread wiper operating member 84 is provided in the driving means 27, and the first clamping unit 24 and the second clamping part 25 are formed so that the thread wiper main body 83 operates in conjunction with the operation when the upper thread T is clamped. Therefore, the configuration of the yarn wiper 30 can be simplified, and the yarn wiper can be reliably carried out regardless of the variation in the operation of the first clamping member 31 and the component accuracy.

  Furthermore, according to the upper thread clamp device 10 of the present embodiment, the thread wiper body 83 is provided in the first clamping member 31, and the thread wiper operating member 84 is provided in the driving means 27. 83 is formed so as to operate in conjunction with the operation when the first clamping part 24 and the second clamping part 25 clamp the upper thread T, the position where the upper thread T is paid is always a fixed position. (Timing).

  17 to 24 show another embodiment of the upper thread gripping device of the sewing machine according to the present invention. In addition, about the structure same as the needle thread clamp device of 1st Embodiment mentioned above, the same code | symbol is attached | subjected in drawing only to the principal part, and the detailed description is abbreviate | omitted. Further, in FIGS. 17 to 24, only the main parts are denoted by reference numerals.

  In the upper thread clamp device 10A of the present embodiment, the thread wiper body 83A of the thread wiper means 30A is provided in the drive means 29, the thread wiper operating member 84A is provided in the first clamping member 31, and the thread wiper body 83A is clamped in the first. The portion 24 and the second clamping portion 25 are formed so as to operate in conjunction with the operation when the upper thread T is clamped.

  That is, as shown in FIG. 17 and FIG. 18, the portion on the Y axis direction − side of the formation position of the yarn catching portion 33 on the outer surface located on the X axis direction − side of the first clamping member 31 includes the yarn A pay-off operation member 84A is extended and formed. The yarn wiper operating member 84A includes a base portion 84Aa having a substantially rectangular shape extending from the first clamping member 31 so as to project toward the X axis direction minus side, and the X axis direction of the base portion 84Aa. A flat plate-like driving portion 84Ab extending from the tip located on the − side toward the lower side on the Z axis direction − side. The rear end of the drive portion 84Ab located on the negative side in the X-axis direction comes into contact with and separates from the input arm 86a of the yarn wiper arm 85A of the yarn wiper main body 83A.

  The yarn wiper main body 83A is attached to the lower surface of the yarn wiper main body attaching portion 91 formed on the guide plate 63. This thread wiper main body attachment portion 91 is an attachment base portion that extends from the central portion of the front end surface located on the Y axis direction + side of the guide plate 63 so as to protrude in the Y axis direction + side closer to the X axis direction − side. A substantially rectangular parallelepiped stopper 92 is formed extending downward at the tip of the lower surface of the mounting base 91a located on the + side in the Y-axis direction. And the screw hole 93 penetrated in the thickness direction is formed in the approximate center part of the attachment base 91a.

  The yarn wiping body 83A extends from the rear end of the yarn wiping arm 85A, which is long in the front-rear direction, on the Y-axis direction minus side of the yarn wiping arm 85A toward the X-axis direction plus side. The formed flat input arm 86A is formed in a bell crank shape as a whole. Further, a claw portion 85Aa extending toward the X axis direction + side is formed at the tip of the yarn wiper arm 85A, and is formed so as to form a hook shape as a whole. Then, a concave portion 85Ab as a yarn catching portion by the yarn wiper main body 83A is formed at the base of the claw portion 85Aa which is a connection portion between the side surfaces of the claw portion 85Aa and the yarn wiper arm 85A on the + side in the X axis direction. Has been. Further, an insertion hole 87A penetrating in the vertical direction is formed in a connecting portion between the yarn wiper arm 85A and the input arm 86A, and the insertion hole 87A serves as a support pin for supporting the yarn wiper body 83A. A functioning mounting step screw 88A is inserted from below.

  The mounting step screw 88A is screwed into the screw hole 93 of the thread wiper body mounting plate 91, and the thread wiper body 83A is rotatable about the mounting step screw 88A. Further, a torsion coil spring 89A as an urging means is attached to the attaching step screw 88a. The torsion coil spring 89A is disposed on the lower surface side of the yarn wiper main body 83A, one end is hooked on the rear end of the input arm 86A located on the Y axis direction minus side, and the other end of the yarn wiper main body attaching portion 91. It is hung on the outer periphery of a pin-shaped spring hook portion 94 (FIG. 18) erected on the lower surface of the mounting base portion 91a.

  In the yarn wiper main body 83A, the right side surface of the yarn wiper arm 85A located on the negative side in the X-axis direction is normally in contact with the stopper 92 by the biasing force (spring force) of the torsion coil spring 89A. The maximum rotational position in the counterclockwise direction when viewed from above, which is the direction + side, is restricted, and the thread wiper arm 85A is clockwise (counterclockwise in FIG. It is configured to allow only rotation in the direction). In this state, the yarn wiping arm 85A is disposed substantially parallel to the yarn catching portion 33 on the side of the yarn catching portion 33 that is located on the negative side in the X-axis direction, and is positioned away from the yarn catching portion 33. keeping. Further, the claw portion 85a of the thread wiper arm 85 is disposed substantially on the extension line along the X-axis direction at the tip of the thread catcher 33, and the thread wiper body 83A is viewed from above with the mounting step screw 88A as the center. When the thread is rotated clockwise, the yarn wiper arm 85A is configured to cross directly below the yarn catching portion 33.

  While the thread wiper operating member 84A and the clamping means 26 reach the clamping position from the initial position, the tip abuts against the input arm 86A to start the rotation of the thread wiper main body 83A, and the clamping means 26 exceeds the clamping position. When the release position is reached, the rotation of the thread wiper body 83A is completed.

  Further, the yarn wiper operating member 84 </ b> A is not limited to the first clamping member 31, and may be disposed at other fixed parts such as the bed portion 2.

  Furthermore, the yarn wiper operating member 84A may be a screw member capable of significantly projecting the amount of protrusion with respect to the Y-axis direction minus side, and the abutting position with the input arm 86A can be changed. According to such a configuration, the accuracy of the parts can be reduced and the cost can be reduced, and the rotation timing and opening angle of the thread wiper main body 83A can be adjusted in detail, and fine settings can be made for the thickness and strength of the upper thread T. If possible, thread breakage can be prevented, and the quality of the sewing product can be further improved.

  Since other configurations are the same as those of the above-described upper thread clamp device 10 of the first embodiment, detailed description thereof will be omitted.

  The needle thread clamp device 10A of the present embodiment operates in the same manner as the needle thread clamp device 10 of the first embodiment described above.

  That is, as shown in FIGS. 19 and 20, the thread wiper 30A of the upper thread clamp device 10A of the present embodiment is arranged so that the thread wiper actuating member 84A is moved in the middle of the clamping means 26 reaching the clamping position from the initial position. The end contacts the input arm 86A. Further, since the input arm 86A is pushed by the yarn wiper operating member 84A due to further rearward movement toward the clamping position of the first clamping unit 24, the yarn wiper main body 83A resists the biasing force of the torsion coil spring 89A. Rotation is started along the horizontal plane with the mounting stepped screw 88A as the center in the counterclockwise direction of FIG.

  Next, when the pinching means 26 is positioned from the initial position to the pinching position, the thread wiper means 30A, as shown in FIG. 21 and FIG. The yarn end TA of the upper yarn T that rotates toward the portion 33 and hangs down from the portion where the upper yarn T is clamped by the clamping means 26 is caught and hooked by the concave portion 85Aa of the yarn wiper arm 85A immediately below the yarn catching portion 33. The yarn is then wiped in the X-axis direction-side and in the Y-axis direction-side.

  Next, when the pinching means 26 is positioned from the pinching position to the release position, the thread wiper means 30A is configured such that the tip side of the thread wiper arm 85A is thread catching centering on the mounting step screw 88A as shown in FIGS. Further, the yarn is wiped by rotating further toward the portion 33.

  According to the upper thread clamp device 10A of the present embodiment having such a configuration, the thread wiper main body 83A is provided on the driving means 27, specifically the guide plate 63, and the thread wiper operating member 84A is the first clamping member 31. The thread wiper body 83 is formed so as to operate in conjunction with the operation when the first clamping part 24 and the second clamping part 25 clamp the upper thread T. The same effect as that of the upper thread clamp device 10 can be obtained, and the thread wiper path can be fixed (stabilized) with respect to the upper thread T path. Since the load can be received by the fixed guide plate 63, stable yarn wiping can be reliably performed even if the upper thread T is a thick thread or the like.

  The thread wiper of the upper thread clamp device of the sewing machine of the present invention can be used in various conventional upper thread clamp devices of the sewing machine.

  Further, the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

1 is a partially cut external front view showing a main part of a sewing machine provided with an embodiment of an upper thread clamp device of a sewing machine according to the present invention. FIG. 1 is an enlarged view showing a main part near the hook of the sewing machine of FIG. Block diagram showing the main part of the sewing machine of FIG. The perspective view which shows the principal part of embodiment of the upper thread clamp device of the sewing machine which concerns on this invention. 4 is an exploded perspective view of the main part of FIG. 4 is an enlarged exploded perspective view of the main part of FIG. Explanatory drawing which shows the principal part of the operation state which the upper thread clamping means of the upper thread clamp device of FIG. 4 located in the initial position FIG. 7 is a partially enlarged view of the main part of the upper thread clamping means. The bottom view of the principal part of the upper thread clamp device of FIG. FIG. 9 is a partially enlarged view of the vicinity of the thread wiper means. FIG. 7 is a view similar to FIG. 7 showing the main part of the operating state in which the upper thread clamping means subsequent to FIG. 7 has reached the position where the thread wiper starts operating at an intermediate position between the initial position and the clamping position. The bottom view of the principal part of FIG. The same figure as FIG. 7 which shows the principal part of the operation state which the upper thread clamping means following the FIG. 11 located in the clamping position The bottom view of the principal part of FIG. The same figure as FIG. 7 which shows the principal part of the operation state in which the upper thread clamping means following the FIG. 13 is located at the release position The bottom view of the principal part of FIG. The figure similar to FIG. 6 which shows the principal part of other embodiment of the upper thread clamp device of the sewing machine which concerns on this invention The bottom view of FIG. FIG. 17 is a view similar to FIG. 7 showing the main part of the operating state in which the upper thread clamping means of the upper thread gripping device in FIG. The bottom view of the principal part of FIG. The same figure as FIG. 7 which shows the principal part of the operation state in which the upper thread clamping means following the FIG. 19 is located at the clamping position The bottom view of the principal part of FIG. The same figure as FIG. 7 which shows the principal part of the operation state in which the upper thread clamping means following the FIG. 21 is located at the release position The bottom view of the principal part of FIG. Explanatory drawing which shows the state which clamped the upper thread in the conventional upper thread clamp device of a sewing machine Explanatory drawing which shows the state which a thread | yarn end part enters in the inside of the upper thread | yarn loop in the upper thread clamp device of the conventional sewing machine Explanatory drawing which shows the state by which the thread end part of an upper thread is pulled up with the upper thread loop following FIG. 27 is an explanatory view showing a state in which the thread end of the upper thread following FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 8 Needle plate 8a Needle hole 9 Hook mechanism 10, 10A Upper thread clamp device 11 Control means 24 1st clamping part 25 2nd clamping part 26 Upper thread clamping means 27 Driving means 28 Moving means 29 Related operation means 30, 30A Yarn Dispensing means 31 1st clamping member 32 2nd clamping member 33 Yarn catching section 34 Yarn-wiping body mounting plate 35, 93 Screw hole 36, 92 Stopper 55 Y-axis moving mechanism 56 Moving position detecting means 63 Guide plate 83, 83A Yarn Wiping body 84, 84A thread wiping operating member 85, 85A thread wiping arm 86, 86A input arm 89, 89A torsion coil spring 91 thread wiping body mounting section 94 spring hook N sewing needle Na threading hole NL vertical movement path T upper thread TA Thread end TL Upper thread loop V (Connecting upper thread clamping part and hook) Thread path W Loop

Claims (3)

An upper thread clamping means for capturing and clamping the yarn end of the upper thread; and a driving means for driving the upper thread clamping means,
At the beginning of sewing, the thread end of the upper thread inserted through the threading hole of the sewing needle is captured and clamped at a position below the needle plate of the bed and away from the vertical movement path of the sewing needle, and thereafter In the upper thread clamp device of the sewing machine that is formed so as to release the thread end portion of the upper thread that has been pinched after dropping the needle number set in advance,
When the upper thread clamping means captures and clamps the upper thread, the thread end of the upper thread that hangs down from the position where the upper thread is clamped by the upper thread clamping means is threaded away from the upper thread loop pulling path. A thread wiper is provided ,
The upper thread clamping means includes a thread catching portion formed in a frame shape through which a threading hole of the sewing needle penetrating the needle hole of the needle plate can pass through,
The yarn wiping means is movable along a horizontal plane, and a yarn wiping main body that normally maintains a position separated from the yarn catching portion by the urging force of the urging means, and a yarn that is in contact with and separated from the yarn wiping main body It has a payment actuating member,
An upper thread clamp device for a sewing machine, wherein the thread wiper operating member is configured to operate the thread wiper main body so that the thread wiper is operated by bringing the thread wiper operating member into contact with the thread wiper main body . The upper thread clamping means is disposed so as to be able to contact and separate relative to the first clamping member, and a first clamping member provided with a first clamping part provided in the yarn catching part. A second clamping member comprising a second clamping part that clamps the yarn end between
The driving means includes at least an initial position where the inside of the yarn catching portion is located on the vertical movement path and the first clamping portion and the second clamping portion are opposed to both sides via the vertical movement path; A clamping position in which the first clamping part and the second clamping part are spaced apart from each other in the vertical movement path and the yarn end part is clamped between the first clamping part and the second clamping part; The upper thread clamping means is configured to be drivable so that two positions can be taken selectively,
The thread wiper body is provided on the first clamping member;
The yarn wiper operating member is provided in the drive means;
According to claim 1, wherein the thread wiper body is formed such that the second clamping portion between the first sandwiching unit is operated in conjunction with the operation when sandwiching the upper thread Upper thread clamp device for sewing machines. The upper thread clamping means is disposed so as to be able to contact and separate relative to the first clamping member, and a first clamping member provided with a first clamping part provided in the yarn catching part. A second clamping member comprising a second clamping part that clamps the yarn end between
The driving means includes at least an initial position where the inside of the yarn catching portion is located on the vertical movement path and the first clamping portion and the second clamping portion are opposed to both sides via the vertical movement path; A clamping position in which the first clamping part and the second clamping part are spaced apart from each other in the vertical movement path and the yarn end part is clamped between the first clamping part and the second clamping part; The upper thread clamping means is configured to be drivable so that two positions can be taken selectively,
The thread wiper body is provided in the drive means;
The yarn wiper operating member is provided on the first clamping member;
According to claim 1, wherein the thread wiper body is formed such that the second clamping portion between the first sandwiching unit is operated in conjunction with the operation when sandwiching the upper thread Upper thread clamp device for sewing machines.

Images