JP2007268013A - Thread retainer of buttonholing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the adjustment of a swinging angle of a movable arm by horizontally swingably supporting the movable arm to a body frame. <P>SOLUTION: The arm part of an eyelet buttonholing machine is fixed with the body frame 11 and the lower side of the body frame 11 is liftably disposed with the movable arm 12. The movable arm 12 is provided with a raised guide shaft 13 at the rear end part of the rear half 12a and an upright shaft 20 at the front end part of the rear half 12a. An engagement member 30 formed in the direction horizontally crossing with the axis of the arm part 5 and having a notched groove portion 30b is front/rear slidably supported to the lower end part of the body frame 11, and the upright shaft 12 is penetratingly engaged with the notched groove portion 30b. A worker moves the engagement member 30 in the front/rear direction, adjusts the movable arm 12 by an intended swinging angle via the engagement between the upright shaft 20 and the notched groove portion 30b to adjust the left/right directional position of the pair of thread retainers 18a and 18b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention drives a pair of thread grippers for gripping the end portion of the cut upper thread near the back of the sewing needle after completion of the sewing of the stitched stitches in the vertical direction and the front-rear direction, and further opens and closes it. The present invention relates to a thread gripping device for a perforated sewing machine.

  2. Description of the Related Art Conventionally, a hole sewing machine has a button hole formed by a hammer, and performs sewing in a zigzag manner around the button hole. Such a perforated sewing machine is generally equipped with a thread gripping device that grips a thread end portion of an upper thread extending from a sewing needle with a pair of thread grippers at the end of sewing.

  In a bobbin stitching machine equipped with this kind of thread gripping device, when performing boring stitching continuously, the next bobbin stitching is performed with the thread end gripped by a pair of thread grippers of the thread gripping device. The thread end is sewn into the next hole seam by continuing to hold until the thread end is naturally removed from the pair of thread grippers. By the way, although there is a case where the seam stitch is not accompanied by a tack, it may have various kinds of tack such as a flow tack or a straight tack.

  The end portion at the end of the hole stitching without these tacks or the flow tacking is on the left side of the hole stitching, but the end part at the end of the straight stitching hole stitching is on the right side of the hole stitching. Therefore, the operator adjusts the position in the left-right direction of the pair of thread grippers for gripping the upper thread end portion in accordance with the type of tacking when starting the hole sewing.

For example, the bobbin sewing machine described in Patent Document 1 can form a straight tack-type boring seam, and an upper thread gripper that grips the thread end of the upper thread with a pair of gripping pieces provided in the upper thread gripping part. A device is provided. In this boring machine, when the final needle drop position of the straight tack is outside the range that can be gripped by the pair of gripping pieces, the final needle drop position is not adjusted instead of adjusting the horizontal position of the pair of thread grippers. The feed base is moved in the X direction so as to be within a range where the angle can be grasped.
JP 2002-306881 A (pages 8-9, FIG. 12, FIG. 13)

  As described above, in the boring machine described in Patent Document 1, when sewing a straight tacking type boring seam, the straight tacking is performed without adjusting the left and right positions of the pair of thread grippers. Each time the die-casting was completed, the feed base was moved in the X direction each time. Moreover, when the thread gripping by the thread gripper is completed, it is necessary to move and return the feed base in the reverse X direction for the next straight tack-type hole sewing. Therefore, in the conventional hole sewing machine, the movement control of the feed base becomes complicated, the movement time of the feed base is necessary, the cycle time of the hole sewing becomes longer, and the productivity is lowered. There's a problem.

  An object of the present invention is to support the movable arm on the main body frame so as to be swingable horizontally, simplify the adjustment of the swing angle of the movable arm according to the type of hole sewing, and shorten the cycle time of the hole sewing. To improve productivity.

  A thread gripping device for an overlock sewing machine according to claim 1 is a thread gripping device for an overlock sewing machine that grips an upper thread that extends from a hole sewing end portion sewn by a hole stitching sewing machine to a stitch hole of a sewing needle near the back of the sewing needle. The main body frame fixed to the arm part of the sewing machine, the guide shaft supported by the guide member fixed to the main body frame so as to be movable up and down, and the lower end of the guide shaft horizontally disposed at the lower end of the main body frame A movable arm fixed to the guide shaft and capable of swinging around the guide shaft, a first actuator for driving the movable arm up and down relative to the body frame, and supported by the front end of the movable arm and extending toward the sewing needle. A front end arm, a pair of thread grippers attached to the free end of the front end arm, a second actuator for opening and closing the pair of thread grippers, a movable arm, and a body frame And it is attached over to the arm in which the swing angle relative to the body frame of the movable arm and a adjustable swing angle adjusting mechanism.

  The swing angle adjustment mechanism can be used to freely adjust the swing angle of the movable arm relative to the body frame with the guide shaft as the swing center so that the cut upper thread can be grasped according to the type of eyelet stitches to be sewn. Is done. As a result, the left and right positions of the pair of thread grippers attached to the front end arm supported by the front end portion of the movable arm are adjusted. At the end of eyelet stitching, the movable arm is driven by the first actuator and the front arm supported by the front end of the movable arm is lowered, and the pair of thread grippers is opened by the second actuator. The front end arm moves closer to the back of the sewing needle.

  After that, when the work cloth is retracted backward, the left and right positions of the pair of thread grippers are adjusted in advance, so that the upper thread extending from the hole sewing end portion to the eye hole of the sewing needle is a pair of thread grippers. Located between. At this time, the pair of thread grippers are closed by driving the second actuator, and the upper thread extending from the hole sewing end portion is gripped near the rear of the sewing needle.

  According to a second aspect of the present invention, there is provided a thread gripping device for an over-stitching sewing machine according to the first aspect, wherein the swing angle adjusting mechanism includes an upright shaft standing on a movable arm, and the vertical shaft engages in a penetrating manner, and the arm portion It is comprised with the engaging member which has a groove part of the direction which cross | intersects an axis line and a horizontal direction.

  According to a third aspect of the present invention, there is provided a thread gripping device for an over stitch sewing machine according to the first aspect, wherein a compression spring for elastically urging the guide shaft upward is provided on the guide shaft.

  According to a fourth aspect of the present invention, there is provided a thread gripping device for an over-sewing sewing machine according to any one of the first to third aspects, wherein the first actuator is fixed to the main body frame, and the tip end portion of the output shaft of the first actuator has an oscillation angle. The adjustment mechanism is connected to the movable arm so that the connection position can be adjusted when the swing angle of the movable arm is adjusted.

  According to a fifth aspect of the present invention, there is provided the thread gripping device for the over-stitch sewing machine according to the first aspect, wherein the guide shaft is fixed to the rear end portion of the movable arm.

  According to the first aspect of the present invention, in a thread gripping device for a hole-sewn sewing machine that grips an upper thread extending from a hole-sewn end portion sewed by a hole-sewn sewing machine near the rear of the sewing needle, The guide shaft, the movable arm, the first actuator, the front end arm, the second actuator, and the swing angle adjusting mechanism are provided. Depending on the type, it is possible to easily adjust the swing angle of the movable arm with respect to the main body frame, that is, to adjust the left and right positions of the pair of thread grippers. Moreover, the movable arm can be moved up and down while maintaining the adjusted swing angle, and the upper thread extending from the end of the hole stitching to the eye hole of the sewing needle can be reliably grasped by a pair of thread grippers. it can.

  According to a second aspect of the present invention, the swing angle adjusting mechanism is formed in a direction in which the upright shaft erected on the movable arm, the vertical shaft engages in a penetrating manner and intersects the axis of the arm portion in the horizontal direction. With the engaging member having the groove portion formed, the swing angle adjusting mechanism is simplified. Moreover, when adjusting the swing angle of the movable arm, the vertical shaft provided on the movable arm and the groove formed on the engagement member can be engaged with each other by a simple manual operation of moving the engagement member in the front-rear direction. Thus, the swing angle of the movable arm can be easily adjusted.

  Furthermore, the movable arm can be prevented from rotating by engaging with the vertical groove, and not only fine adjustment is possible when adjusting the swing angle of the movable arm relative to the body frame, but also greater than the adjusted swing angle. The position of the pair of thread grippers can be adjusted in the left-right direction with the amount of swing movement. Other effects similar to those of the first aspect are obtained.

  According to the invention of claim 3, since the compression spring that elastically biases the guide shaft upward is provided on the guide shaft, the compression spring is provided even when the supply of pressurized air to the first actuator is stopped. The movable arm can be held in the raised position by the spring force. Other effects similar to those of the first aspect are obtained.

  According to a fourth aspect of the present invention, the first actuator is fixed to the main body frame, and the tip of the output shaft of the first actuator is connected when the swing angle of the movable arm is adjusted by the swing angle adjusting mechanism. Since it is connected to the movable arm so that the position can be adjusted, when the swing angle of the movable arm is adjusted by the swing angle adjusting mechanism, any swing angle can be adjusted by adjusting the connection position of the first actuator with respect to the movable arm. In this case, it is possible to smoothly move the movable arm up and down by the first actuator. Other effects similar to those of any one of claims 1 to 3 are provided.

  According to the invention of claim 5, since the guide shaft is fixed to the rear end portion of the movable arm, the radius from the guide shaft which is the swing center to the pair of thread grippers can be increased, and the swing of the movable arm can be increased. The adjustment allowance for the position in the left-right direction of the pair of thread grippers relative to the moving angle can be increased. Further, the swing angle adjusting mechanism is provided in front of the guide shaft, and depending on the distance between the guide shaft and the swing angle adjusting mechanism, the left and right of the pair of thread grippers with respect to the swing angle of the movable arm The enlargement rate of the adjustment allowance for the direction position can be set arbitrarily. Other effects similar to those of the first aspect are obtained.

  The upper thread gripping device of the hole sewing machine of this embodiment supports the front end arm provided with a pair of thread grippers on the front end of the movable arm, and this movable arm is fixed to the arm part of the hole sewing machine. The swing angle relative to the main body frame is supported by the main body frame via a swing angle adjusting mechanism.

  As shown in FIG. 1, a perforated sewing machine 1 includes a bed base 2 having a substantially rectangular box shape opened upward, a bed part 3 placed so as to be fitted into the bed base 2, and the bed part 3 has a pedestal portion 4 standing from the rear portion of FIG. 3, an arm portion 5 extending forward from the upper portion of the pedestal portion 4, and the like, and is placed and fixed on a work table (not shown).

  A needle bar 7 having a sewing needle 6 is provided at the front lower part of the arm portion 5 so as to be movable up and down. Although not shown in detail, the rotational force of the main shaft that is rotated by the driving of the sewing machine motor is transmitted to the cam mechanism, and is predetermined. It is driven up and down while swinging left and right by the width. In this case, every time the main shaft rotates twice, the needle bar 7 swings between the left swing position and the right swing position.

  The bed portion 3 is provided with a looper base (not shown) provided with two loopers (not shown) so as to face the needle bar 7. These two loopers are driven in synchronism with the vertical movement of the needle bar 7 by rotation of the main shaft through a cam mechanism (not shown). Further, the needle bar 7 and the looper base are integrally rotated around the vertical axis in a horizontal plane by a rotation mechanism (not shown) including a θ-direction drive motor and a gear mechanism provided in the bed portion 3. It has become.

  The bed 3 is detachably mounted with a knife (not shown) for forming a fixed eyelet located on the rear side of the looper base, and is punched so as to contact and separate from the knife from above. A hammer (not shown) is swingably provided. A hammer for the eyelet hole (not shown) is detachably attached to the tip of the hammer, and is driven by a hammer drive mechanism (not shown) including an air cylinder provided in the bed portion 3. And eyelet holes made up of legs are drilled in the work cloth.

  A feed base 8 on which a work cloth is set is provided on the upper surface of the bed 3. Although not shown in the bed portion 3, an X-direction moving mechanism that moves the feed base 8 in the X direction (left and right direction) by driving the X direction driving motor, and Y by driving the Y direction driving motor. And a Y-direction moving mechanism that moves in the direction (front-rear direction).

  A pair of left and right cloth presser levers (not shown) for holding the work cloth is provided on the upper surface of the feed base 8, and a presser foot (not shown) is attached to the tip of each of the cloth presser levers. These presser foot levers are driven by an air cylinder (not shown) to switch between an upper retracted position and a lower pressed position.

  Next, a description will be given of the thread gripping device 10 that grips the cut upper thread near the back of the sewing needle 6 after the hole sewing is completed.

  As shown in FIGS. 1 and 2, the thread gripping device 10 includes a main body frame 11, an elevating mechanism 200 that is attached to the main body frame 11 and moves up and down a gripping mechanism 100 described later, and a gripping mechanism provided in the elevating mechanism 200. A moving mechanism 300 that moves the front and rear 100, a gripping mechanism 100 that is provided in the moving mechanism 300 and grips the upper thread, and a swing angle adjusting mechanism 15 that can adjust the swing angle of the lifting mechanism 200 with respect to the main body frame 11. It mainly consists of.

  The elevating mechanism 200 includes a movable arm 12 disposed horizontally in the vicinity of the lower end of the main body frame 11, a guide shaft 13 that supports the movable arm 12 to be swingable on the main body frame 11, and the movable arm 12 as the main body frame 11. The air cylinder 14 for raising and lowering (which corresponds to the first actuator) is mainly constituted.

  The moving mechanism 300 includes a front end arm 16 supported on the front end portion of the movable arm 12 so as to be rotatable about a vertical axis, and the front end arm 16 is set at a predetermined angle over a backward swing position and a forward swing position. It is mainly composed of front and rear air cylinders 17 that are driven to swing.

  The gripping mechanism 100 includes a pair of left and right thread grippers 18a, 18b attached to the tip (right end) of the front end arm 16, and an open / close air cylinder 19 (opening / closing the pair of thread grippers 18a, 18b). This corresponds to the second actuator).

  As shown in FIGS. 2 to 6, the main body frame 11 is a substantially triangular plate member in a side view, and is fixed to the left side wall of the arm portion 5 in the vertical direction by a plurality of fixing bolts (not shown). Yes. The movable arm 12 has a substantially square shape in plan view and extends in the front-rear direction. The rear half 12 a is positioned below the main body frame 11, and the front half 12 b extends forward from the main body frame 11. A guide shaft 13 is erected on the upper side of the rear end portion of the movable arm 12, and a vertical shaft 20 is erected on the upper side of the rear half 12a.

  A block-shaped guide member 22 is fixed to a lower portion of the rear end portion of the main body frame 11, a guide shaft 13 is inserted into a circular hole formed in the guide member 22 in a vertical direction, and the movable arm 12 passes the guide shaft 13. It is supported so that it can be moved up and down. An elevating air cylinder 14 is fixed downward to the main body frame 11 by a plurality of fixing bolts 23, and a tip end portion of a rod 14 a of the elevating air cylinder 14 is fixed to a rear half portion 12 a of the movable arm 12.

  Therefore, when the ascending / descending air cylinder 14 is driven to advance and retreat, the movable arm 12 is moved up to the main body frame 11 (see FIG. 2) and lowered from the main body frame 11 (see FIGS. 4 and 5). ) And is driven up and down.

  However, as shown in FIGS. 2 and 5, a compression spring 24 is externally provided on the upper side of the guide member 22 of the guide shaft 13. Therefore, even when compressed air is no longer supplied to the lifting air cylinder 14, the movable arm 12 is held at the raised position shown in FIG. 2 by the spring force of the compression spring 24 and does not descend to the lowered position.

Next, the swing angle adjusting mechanism 15 will be described.
As shown in FIGS. 3 to 5, the swing angle adjusting mechanism 15 includes an upright shaft 20 erected on the movable arm 12, an engagement member 30 that engages with the upright shaft 20, and the like.

  The engaging member 30 has a block shape, and a connecting wall portion 30 a is integrally provided on the right end portion located on the right side of the main body frame 11. On the other hand, two horizontal slits 11a are formed in the front end portion of the lower end portion of the main body frame 11 corresponding to the upper end portion of the connecting wall portion 30a. Therefore, the engaging member 30 is fixed so as to be movable in the front-rear direction by inserting the two fixing screws 31 through the corresponding slits 11a and screwing them into the connecting wall portion 30a. Therefore, by loosening these fixing screws 31, the engaging member 30 can move horizontally back and forth by the length of the slit 11a.

  Further, the engaging member 30 has a notch groove portion 30b (in the direction intersecting the axis of the arm portion 5 in the horizontal direction) that is gently inclined with respect to the vertical surface in the front-rear direction from the front end to the vicinity of the rear end. A notch groove 30b that is inclined toward the sewing needle as it goes rearward is formed, and the vertical shaft 20 is vertically engaged with the notch groove 30b. Therefore, as shown in FIG. 7, when the vertical shaft 20 is positioned at the rear end of the notch groove 30b, the two fixing screws 31 are loosened and the engaging member 30 is slid backward (see the two-dot chain line in FIG. 7). The movable arm 12 rotates clockwise through the vertical shaft 20 around the guide shaft 13 as a center of rotation.

  On the contrary, when the vertical shaft 20 is positioned at the front end of the notch groove 30b, when the two fixing screws 31 are loosened and the engagement member 30 is slid forward (shown by a solid line in FIG. 7), the movable arm 12 is Via the upright shaft 20, the guide shaft 13 is rotated counterclockwise in plan view with the guide shaft 13 as a rotation center. Here, as shown in FIG. 6, the movable arm 12 is formed with a curved notch 12c, which is a part of an arc, and the tip of the rod 14a of the elevating air cylinder 14 passes through the curved notch 12c. It is fixed. Therefore, when adjusting the swing angle of the movable arm 12 by the swing angle adjusting mechanism 15, the lifting air cylinder 14 is connected to the movable arm 12 so that the connecting position of the tip of the rod 14a can be adjusted. ing.

  By the way, as shown in FIGS. 2 to 6, the corner portion of the front end arm 16 having a substantially L shape in plan view is attached to the front end portion of the movable arm 12 by the first support shaft 32 fixed to the movable arm 12. It is supported so that it can rotate around. The front and rear air cylinders 17 are fixed to the front lower surface of the vertical shaft 20 of the movable arm 12 with screws 33. Therefore, the distal end portion of the rod 17a of the front / rear air cylinder 17 is connected to the rear end portion of the first arm 16a extending rearward of the front end arm 16 via an L-shaped plate.

  The second arm 16b extending to the right (sewing needle side) of the front end arm 16 drops downward in the middle, and the upper end of the thread gripping tool 18a extending downward to the right end (free end) of the second arm 16b. The part is fixed. A pair of substantially U-shaped support portions 18c in a plan view are formed on the upper end portion of the thread gripping tool 18a so as to face each other, and the second support shaft 35 facing in the front-rear direction is fixed to the support portions 18c. Has been.

  Therefore, the middle step in the height direction of the thread gripping tool 18b is supported by the second support shaft 35 so as to be opened and closed. Further, a coil spring (not shown) is provided on the second support shaft 35, and the lower end portion of the thread gripping tool 18b is pressed and urged against the lower end portion of the thread gripping tool 18a by the spring force of the coil spring.

  An opening / closing air cylinder 19 is fixed to the right end of the front end arm 16, and the tip of the rod 19a of the opening / closing air cylinder 19 can come into contact with the upper end of the thread gripper 18b from the left. Therefore, when the open / close air cylinder 19 is driven to retract, the rod 19a retracts, so that the lower end of the thread gripper 18b is pressed and urged against the lower end of the thread gripper 18a (FIG. 11). -4), and the upper end of the upper thread is held. However, when the open / close air cylinder 19 is driven to advance, the rod 19a advances, so that the lower end of the thread gripper 18b is separated from the lower end of the thread gripper 18a (FIGS. 2, 4, and 6). Reference).

  When the front and rear air cylinders 17 are driven to retract, the rod 17a retracts, so that the front end arm 16 has a pair of thread grippers 18a and 18b as shown by the solid lines in FIGS. The mounted free end (right end) portion is switched to the reciprocating swinging position in which the retreated portion (see the solid line in FIG. 10) is retreated. When the front / rear air cylinder 17 is driven to advance, the rod 17a advances, so that the front end arm 16 is fitted with a pair of thread grippers 18a and 18b as shown by two-dot chain lines in FIGS. The free end (right end) portion is switched to the forward swing position in which the forward end (see the two-dot chain line in FIG. 10) has advanced.

  Here, in addition to the front end arm 16 being movable around the vertical axis at the front end portion of the movable arm 12 by the first support shaft 32, the second arm 16 b is provided closer to the rear than the first support shaft 32. Therefore, due to the offset to the rear side with respect to the first support shaft 32, the distal end portion of the second arm 16b moves to the left in the backward swing position than in the forward swing position.

  That is, as shown in FIG. 10, the pair of thread grippers 18a and 18b provided at the right end portion of the front end arm 16 moves forward and to the right when the front end arm 16 is in the forward swing position than in the reverse swing position. When the front end arm 16 is in the backward swing position, the front end arm 16 moves backward and leftward than in the forward swing position.

Next, the operation of the thread gripping device 10 configured as described above will be described with reference to FIG.
As shown in FIG. 11A, first, when the sewing of the eyelet seam 40A having the straight tack 40a is completed, a pair of upper threads 41 extending from the end of the seam stitch to the eye hole of the sewing needle 6 are paired. The operator adjusts the left and right positions of the pair of thread grippers 18a and 18b as indicated by solid lines by the adjustment operation described above by the swing angle adjusting mechanism 15 so that the thread grippers 18a and 18b can grip the thread grippers. .

  In particular, after sewing the eyelet seam with a flow tack or the eyelet seam without a tack last time, as shown by a two-dot chain line in FIG. In the moving position, the upper thread 41 from the hole sewing end portion cannot be gripped by the pair of thread grippers 18a and 18b. Therefore, the operator loosens the two fixing screws 31, slides the engaging member 30 forward, and rotates the movable arm 12 counterclockwise in plan view.

  Then, the pair of thread grippers 18a and 18b moves to the right while moving backward. At this time, since the distance from the guide shaft 13 to the pair of thread grippers 18a, 18b is longer than the distance from the guide shaft 13 to the vertical shaft 20, the movable arm 12 adjusted by the swing angle adjusting mechanism 15 is longer. The position of the pair of thread grippers 18a and 18b can be adjusted in the left-right direction with a swing movement amount larger than the swing angle, that is, with a predetermined enlargement ratio.

  That is, since the pair of thread grippers 18a and 18b moves to the right and rearward as shown by the solid line from the position indicated by the two-dot chain line in FIG. 11-1, the pair of thread grippers 18a and 18b The upper thread 41 extending from the hole sewing end portion to the eye hole of the sewing needle 6 can be grasped. Then, in the middle of sewing the eyelet seam 40A having the straight tack 40a, the open / close air cylinder 19 is driven to advance, and the movable thread grippers 18a and 18b are opened. When the sewing of the eyelet seam 40A is finished, that is, when the drive of the sewing machine motor is stopped, the lifting air cylinder 14 is driven to advance and the movable arm 12 is lowered.

  Next, as shown in FIG. 11-2, the upper and lower air cylinders 17 are driven forward after the upper thread cutting is started by a thread trimming mechanism (not shown), and the front end arm 16 is moved backward and backward as shown by a solid line in FIG. The position is switched to a forward swing position indicated by a two-dot chain line. At this time, the pair of thread grippers 18a, 18b is located near the rear of the sewing needle 6, and as described above, the position of the pair of thread grippers 18a, 18b in the left-right direction has already been adjusted. In this state, the pair of thread grippers 18a and 18b can grip the upper thread 41 extending from the hole sewing end portion to the eye hole of the sewing needle 6.

  Next, since the feed base 8 is moved backward by a predetermined distance, as shown in FIG. 11C, the upper thread 41 extending from the hole sewing end portion to the eye hole of the sewing needle 6 is a pair of thread grippers 18a. , 18b. Next, as shown in FIG. 11-4, the open / close air cylinder 19 is driven to retract, and the movable thread grippers 18a and 18b are closed, and the upper thread 41 extending from the hole sewing end portion is a pair of thread grippers. Grabbed by 18a, 18b.

  Thereafter, although not shown, the front / rear air cylinder 17 is driven to retract while the upper thread 41 is gripped by the pair of thread grippers 18a and 18b, and the front end arm 16 is switched to the backward swing position. Further, the lifting / lowering air cylinder 14 is driven to retract, and the movable arm 12 is raised.

  Thereafter, the work cloth is placed at a predetermined position of the feed base 8 for the next sewing, and when the work clamp is lowered, the feed base 8 moves forward and the next eyelet stitching is started. . At this time, as shown in FIG. 11-5, when the pair of thread grippers 18a and 18b is retracted from the forward swing position indicated by the two-dot chain line to the reverse swing position indicated by the solid line, as described above, Since the upper thread 41 held by the pair of thread grippers 18a and 18b is positioned rearward and to the left with respect to the forward swing position indicated by the two-dot chain line, the leg portion 40b of the eyelet seam 40A. Thus, the upper thread 41 can be reliably sewn into the seam of the leg portion 40b.

  As described above, the main body frame 11, the guide shaft 13, the movable arm 12, the elevating air cylinder 14, the front end arm 16, the open / close air cylinder 19, and the swing angle adjusting mechanism 15 are provided. The swing angle adjusting mechanism 15 adjusts the swing angle of the movable arm 12 with respect to the main body frame 11, that is, the left and right positions of the pair of thread grippers 18a and 18b, according to the type of eyelet stitching stitch to be sewn. It can be done easily. Moreover, the movable arm 12 can be moved up and down while maintaining the adjusted swing angle, and the upper thread extending from the hole sewing end portion to the eye hole of the sewing needle 6 is paired with a pair of thread grippers 18a and 18b. You can grab it securely.

  Further, the swing angle adjusting mechanism 15 is erected on the movable arm 12, and the guide shaft 13 and the vertical shaft 20 are engaged with the vertical shaft 20 in a vertically penetrating manner and are gently inclined with respect to the vertical surface in the front-rear direction. Since it has the engaging member 30 which has the notch groove part 30b and was fixed to the main body frame 11 so that adjustment in the front-back direction is possible, the rocking angle adjusting mechanism 15 is simplified. In addition, when the swing angle of the movable arm 12 is adjusted, the loose shaft formed on the vertical shaft 20 and the engagement member 30 that are erected on the movable arm 12 can be simply operated simply by moving the engagement member 30 in the front-rear direction. The swing angle of the movable arm 12 can be adjusted through the engagement with the inclined notch groove 30b.

  Furthermore, the function of preventing the rotation of the movable arm 12 can be exhibited by the engagement with the notch groove portion 30b of the vertical shaft 20, and not only fine adjustment is possible when adjusting the swing angle of the movable arm 12 relative to the main body frame 11, but also the adjustment. The position of the pair of thread grippers 18a and 18b can be adjusted in the left-right direction with a larger swing movement amount than the swing angle.

  In addition, since the compression spring 24 that elastically biases the guide shaft 13 upward is provided on the guide shaft 13, the spring force of the compression spring is provided even when the supply of pressurized air to the elevating air cylinder 14 is stopped. Thus, the movable arm 12 can be held in the raised position.

  The lifting air cylinder 14 is fixed to the main body frame 11, and the tip end of the rod 14 a of the lifting air cylinder 14 is connected to the connecting position when the swing angle of the movable arm 12 is adjusted by the swing angle adjusting mechanism 15. Is connected to the movable arm 12 through a curved notch 12c. Therefore, when adjusting the swing angle of the movable arm 12 by the swing angle adjusting mechanism 15, by adjusting the connecting position of the lift air cylinder 14 to the movable arm 12, the lift air cylinder 14 at any swing angle. Therefore, it is possible to make the lifting and lowering operation of the movable arm 12 smooth.

  Further, since the guide shaft 13 is fixed to the rear end portion of the movable arm 12, the radius from the guide shaft 13, which is the swing center, to the pair of thread grippers 18a, 18b can be increased, and the swing of the movable arm 12 can be increased. It is possible to increase the adjustment allowance for the position in the left-right direction of the pair of thread grippers 18a, 18b with respect to the corners. Further, the swing angle adjusting mechanism 15 is provided on the front side of the guide shaft 13, and a pair of swing angles of the movable arm 12 is set according to the distance between the guide shaft 13 and the swing angle adjusting mechanism 15. It is possible to arbitrarily set the enlargement ratio of the adjustment allowance of the left and right position of the thread grippers 18a, 18b.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1) As shown in FIG. 13, the guide shaft 13 is disposed on the front side of the rear half of the movable arm 12, and the vertical shaft 20 is disposed on the rear end portion of the movable arm 12, so that the thread gripping device 10A is configured. It may be. Also in this case, the same effect as the above-described embodiment can be obtained.

2) The inclination of the notch groove 30b formed in the engaging member 30 may be a notch that inclines to the left as it advances rearward.

3) Although the notch groove 30b formed in the engaging member 30 is formed in a straight line shape, it may be formed in a curved line shape. By forming it in a curved line, it is possible to easily perform adjustments that require accuracy.

4) The movable arm 12 is provided with a curved notch 12c that is a part of an arc so that the connecting position of the tip of the rod 14a of the lifting air cylinder 14 can be adjusted. However, the shape is not limited to this. It may be a long hole or a circle.

5) The present invention is not limited to the embodiment described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes such modifications.

1 is a perspective view of a hole stitch sewing machine according to an embodiment of the present invention. It is a perspective view of a thread clamp device. It is a top view of a thread clamp device. It is a front view of a thread clamp device. It is a right view of a thread clamp device. It is a bottom view of the thread gripping device. FIG. 4 is a view corresponding to FIG. 3 for explaining the swing angle adjustment. FIG. 4 is a view corresponding to FIG. 3 for explaining the front end swing position and the reverse swing position of the front end arm. It is an enlarged plan view of a front end arm. It is explanatory drawing explaining the movement of a pair of thread gripper in an open state. It is explanatory drawing explaining the left-right position adjustment of a thread clamp. FIG. 6 is a diagram of a thread clamp at the end of eyelet stitching. It is explanatory drawing of the state which grasps the upper thread | yarn by a thread grasper. It is explanatory drawing of the state which grasped the upper thread with the thread grasper. It is explanatory drawing of the position of the thread grasper at the time of a start of eyelet hole stitching. It is a timing chart explaining the movement state of a thread clamp. FIG. 4 is a diagram corresponding to FIG. 3 according to a modified embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hole sewing machine 6 Sewing needle 10 Thread grasping apparatus 11 Main body frame 12 Movable arm 13 Guide shaft 14 Lifting air cylinder (first actuator)
15 Oscillating angle adjusting mechanism 16 Front end arm 18a Thread gripper 18b Thread gripper 19 Open / close air cylinder (second actuator)
20 Vertical shaft 22 Guide member 24 Compression spring 30 Engagement member 30b Notch groove

Claims (5)

In a thread gripping device for a hole sewing machine that grips an upper thread that extends from a hole sewing end portion that is sewn by a hole sewing machine to the eye hole of the sewing needle near the back of the sewing needle.
A body frame fixed to the arm of the sewing machine;
A guide shaft supported by the guide member fixed to the main body frame so as to be movable up and down and rotatable;
A movable arm that is horizontally disposed at the lower end of the main body frame, is fixed to the lower end of the guide shaft, and is swingable about the guide shaft as a swing center;
A first actuator for moving the movable arm up and down relative to the main body frame;
A front end arm that is supported by the front end of the movable arm and extends toward the sewing needle;
A pair of thread grippers attached to the free end of the front end arm and a second actuator for opening and closing the pair of thread grippers;
A swing angle adjusting mechanism attached to the movable arm and the main body frame and capable of adjusting a swing angle of the movable arm with respect to the main body frame;
A thread-gripping device for an over-stitch sewing machine, comprising:   The swing angle adjusting mechanism is composed of a vertical shaft erected on the movable arm, and an engaging member that engages the vertical shaft in a penetrating manner and has a groove portion in a direction that intersects the axis of the arm portion in the horizontal direction. 2. The thread gripping device for a hole sewing machine according to claim 1, wherein   The thread gripping device for a bobbin stitching machine according to claim 1, wherein a compression spring for elastically urging the guide shaft upward is provided on the guide shaft.   The first actuator is fixed to the main body frame, and the distal end portion of the output shaft of the first actuator can be adjusted in the connecting position when the swing angle of the movable arm is adjusted by the swing angle adjusting mechanism. The thread gripping device for a hole sewing machine according to any one of claims 1 to 3, wherein the thread gripping device is connected to the movable arm.   The thread gripping device for a hole sewing machine according to claim 1, wherein the guide shaft is fixed to a rear end portion of the movable arm.