CN1609315B - Eyelet buttonhole sewing machine and its piece limiter - Google Patents

Abstract

The buttonhole sewing machine of the present invention is characterized in that it includes: a feed table for placing an object to be sewn; a presser foot for pressing the object to be sewn placed on the feed table; a sewing needle and a looper for forming buttonhole stitches in a stitch forming region of the object to be sewn on the feed table; and a piece restricting member detachably attached On the presser foot and rotatably attached to the presser foot bar on which the presser foot is attached, on one side of the opening in the sewing object having a pre-formed opening When forming a buttonhole stitch, the other side panel portion of the opening can be restricted from approaching the stitch forming region of the one side panel portion.

Description

Eyelet buttonhole sewing machine and its piece limiter

technical field

In particular, the present invention relates to a buttonhole sewing machine for sewing buttonhole stitches on one side of an opening such as a pocket formed in an object to be sewn, and a piece stopper for the buttonhole sewing machine.

Background technique

A round-head buttonhole sewing machine with a looper usually has: a feed table movable in the front, rear, left, and right directions; a pair of left and right presser bars swingably supported on the feed table; respectively provided at the front end of each presser bar presser feet; loopers for double chain stitch sewing; and needle bars, etc. Also, at the rear of the needle bar, there are provided: a cutter for piercing a buttonhole with a round head; Hammer body, etc. The eyelet buttonhole sewing machine of the above-mentioned structure, for example, has been described in the 294884 communique of Japanese Patent Application Laid-Open in 2019.

When using the eyelet buttonhole sewing machine of the above-mentioned structure to sew eyelet eyelet stitches, on the feeding table that is moving to the sewing position, the sewing objects such as the back parts of the trousers are placed, and the left and right Press the position of the sewing part of the sewing object to be held by the presser foot, and turn ON the sewing start switch in this state. Thus, the feeding platform moves according to the sewing data of the pre-selected ball buttonhole stitches, and at the same time, the looper and the needle bar are synchronously driven by the sewing machine motor. Thereby, the eyelet buttonhole stitch which consists of a double chain stitch seam is sewn on the said sewing object.

Then, a left rear pocket (the rear pocket may also be called a hip pocket) is formed on the back of the trousers, and eyelet keyhole stitching is performed on the part of the fabric below the opening of the left rear pocket. , the operator places the object to be sewn, that is, the back panel of the trousers, on the feeding table of the sewing machine in the following manner. That is, the operator places the lower part of the opening of the back pocket in the back of the trousers (the part of the fabric that is opposite to the opening and corresponds to the outside when the hand is inserted into the pocket) on the feeding table to form a and the end on the side of the opening facing the rear, and then expand the opening, while putting the upper fabric part of the opening (the fabric part corresponding to the opening and the human body side when the hand is inserted into the pocket, without sewing) While stretching toward the front side, only the lower side piece of cloth is partially inserted under a pair of presser feet, and press and hold with the presser feet.

In this case, the operator must pull the upper panel part forward as much as possible by hand so that the upper panel part is not caught in the presser foot. Also, when sewing the eyelet buttonhole stitch, in order not to sew the upper side panel part, the operator must stretch the upper side panel part strongly with his hand. In addition, when the sewing of the eyelet buttonhole stitches is finished and the feed table is moved backward in order to punch out the eyelet buttonholes, the operator must pull the upper part of the fabric as far as possible by hand so that the seam The needle does not catch the upper panel portion and does not bring the upper panel portion into contact with the buttonhole hammer.

Like this, in the conventional eyelet sewing machine, in the occasion that eyelet eyelet stitching is carried out on the lower side cloth part of back pocket opening part in the back panel of trousers, operator must not be sewn with eyelet eyelet. The upper part of the eyeliner is restricted, so the sewing operation of the eyelet eyelet is complicated, and there is a problem of poor workability.

Contents of the invention

The object of the present invention is to provide a buttonhole sewing machine which can easily perform a buttonhole sewing operation on one side of an opening formed in an object to be sewn.

The eyelet buttonhole sewing machine of the present invention includes: a feeding table for placing an object to be sewn; a presser foot for pressing the object to be sewn on the feeding table; The sewing needle and the looper for forming buttonhole stitches in the stitch forming area of the object to be sewn on the table are characterized in that a cloth restricting member is provided, and the cloth restricting member is detachably attached to the The presser foot is rotatably mounted on a presser foot bar on which the presser foot is mounted, and is formed on one side of the opening in the sewing object having a previously formed opening. In the case of eyelet buttonhole stitching, the other side panel portion of the opening can be restricted from approaching the stitch forming region of the one side panel portion.

In this case, the panel restricting member may include an upper restricting plate portion and a lower restricting plate portion that restrict the other side panel portion from the upper and lower sides, and an upper restricting plate portion that restricts the other side panel portion. Consists of a rear end restricting part that restricts the rear end position.

With the above structure, when the eyelet buttonhole stitching is formed on the one side panel part, the upper and lower positions and the rear end position of the other side panel part are restricted by the panel restricting member, preventing the other side panel part from opening and closing. The piece portion is close to the sewing area of the one side piece portion, so it can reliably prevent the other side side piece portion from being caught in the presser foot or causing troubles to the sewing of the sewing needle. In addition, when forming the eyelet buttonhole stitches, the operator does not need to stretch the other side part by hand, so that workability can be improved.

In addition, the cloth piece restrictor of the present invention is provided in a buttonhole sewing machine, and is characterized in that it has a restricting portion that is detachably attached to the presser foot and is rotatably attached to the presser foot on which the presser foot is mounted. On the presser foot bar of the foot, when sewing ball buttonhole stitches on one side of the opening in the sewing object having a pre-formed opening, the other side of the opening can be The one side panel portion is restricted from approaching the stitch formation region of the one side panel portion.

In this case, the restricting portion may be composed of an upper restricting plate portion and a lower restricting plate portion restricting the other side panel portion from the upper and lower sides, and a rear restricting plate portion for the other side panel portion. Consists of a rear end limiter that limits the end position.

A brief description of the drawings

Fig. 1 is a perspective view showing the overall structure of a buttonhole sewing machine according to an embodiment of the present invention, viewed from the front right.

Fig. 2 is a top view of the feeding table.

Fig. 3 is a longitudinal sectional right side view showing part of the periphery of the feeding table.

Fig. 4 is a longitudinal sectional left side view showing part of the periphery of the feeding table.

Fig. 5 is a diagram for explaining the operation of the presser foot.

Fig. 6 is a perspective view of the piece restricting member shown in a state of being removed from the presser foot.

Fig. 7 is a diagram corresponding to Fig. 5 when the presser foot is in a retracted position for explaining the state after the rear panel is attached to the trousers having the rear pocket.

Fig. 8 is a view corresponding to Fig. 2 in a state where the back panel of the trousers having the back pocket is attached.

Fig. 9 is a diagram for explaining the state after the rear panel of the trousers having the rear pocket is attached, and a diagram corresponding to Fig. 5 when the presser foot is in the pressing position.

Figure 10 is a top view of the back panel of trousers with back pockets.

Detailed ways

In order to further describe the present invention in detail, the present invention will be described below with reference to the accompanying drawings. In the round head buttonhole sewing machine of this embodiment, a pair of left and right presser arms that can swing freely are provided on a pair of cross-shaped flat plates arranged on the left and right sides of the feeding table, and a pair of left and right presser arms that can rotate integrally are respectively installed on the front ends of the presser arms. presser foot and piece restricting member, and when using the eyelet buttonhole sewing machine to form eyelet buttonhole stitches on the piece of fabric on one side of the opening of a pocket or the like in the object to be sewn, the opening The panel portion on the other side of the panel is restricted by the panel restricting member.

Next, the sewing object will be described.

Fig. 10 shows the upper left part of the rear panel W of the trousers which is the object to be sewn. The back panel W has a left back pocket P already formed. An opening Wa is formed in the left rear pocket P by seaming at the mouth of the pocket, the part above the opening Wa is called the upper panel part Wb, and the part below the opening Wa is called the lower garment. slice part Wc. The upper panel part Wb is the panel part located on the human body side when the hand is inserted into the pocket P, and the lower panel part Wc is the panel part located outside when the hand is inserted into the pocket P. Sewing of the ball buttonhole stitch DN is performed beside the opening Wa in the lower part part Wc.

In addition, the "rear pocket" can also be called "hip pocket (HIP POCKET)".

The overall structure of the eyelet buttonhole sewing machine will be described below with reference to FIG. 1 . The buttonhole sewing machine 1 integrally includes a substantially rectangular box-shaped base portion 2 and an arm portion 3 continuously extending forward from an upper rear portion of the base portion 2 . The sewing machine 1 is placed on an unillustrated sewing machine bed.

The sewing machine table is provided with: the driving source of the driving mechanism such as synchronously driving the needle bar 6 and the looper 8a (refer to FIGS. 2 to 4 ), that is, the sewing machine motor; Optionally carry out the operation panel that selects; The foot-operated start-stop switch; And the control device (all not shown) that controls each mechanism action to be made up of microcomputer.

The arm 3 is provided with a main shaft 7 that rotates following the driving of the sewing machine motor. At the lower front end of the arm portion 3, a needle bar 6 with a sewing needle 5 capable of moving up and down is provided (see FIGS. 3 and 4 ). Although not shown in detail, the needle bar 6 receives a rotational force from the main shaft 7 through a cam mechanism (not shown), and is driven up and down while swinging left and right with a predetermined width. In this case, the main shaft 7 rotates once, and the needle bar 6 moves up and down twice at the left swing position and the right swing position.

As shown in FIGS. 1 and 2 , a looper holder 8 having two loopers 8 a facing the needle bar 6 is provided on the base portion 2 . The two loopers 8a are driven synchronously with the vertical movement of the needle bar 6 by receiving the rotational force from the main shaft 7 through a cam mechanism not shown. Also, the needle bar 6 and the looper base 8 are respectively rotated on the horizontal plane around the vertical axis through the θ-direction driving motor composed of a stepping motor and the rotating mechanism (not shown) composed of a gear mechanism arranged in the base part 2. Integral rotation.

As shown in FIGS. 2 to 4 , a cutter 10 for forming a buttonhole is disposed at the rear portion of the looper holder 8 in the base portion 2 . The cutter 10 is detachably mounted on the mounting table 11 via bolts (not shown). On the upper part of the cutter 10, a buttonhole hammer main body 12 for punching that is separated from the cutter 10 and is swingable is provided. A detachable buttonhole hammer 13 is mounted on the front end of the buttonhole hammer body 12 . The buttonhole hammer main body 12 is driven by a buttonhole hammer driving mechanism (not shown) composed of an air cylinder or the like provided in the base part 2, and works in conjunction with the cutter 10 to sew the object (processed cloth). A buttonhole 10a is punched out, and the buttonhole 10a is formed of a substantially circular buttonhole portion and a linear leg portion connected to the buttonhole portion.

As shown in FIGS. 1 to 4 , a feeding table 15 on which a sewing object can be placed is provided on the upper surface of the base portion 2 . The feed table 15 is a thin rectangular box as a whole, and the portion opposite to the looper base 8 and the cutter 10 is open. A pair of left and right metal cross-shaped flat plates 16 and 17 are provided on the upper surface of the feed table 15 . The substantially front half of these cross-shaped flat plates 16 , 17 is covered by the guide plate 18 .

In base part 2, be provided with the X-direction moving mechanism that feeds table 15 along X direction (left-right direction), the Y-direction moving mechanism that feeds table 15 along Y direction (front-rear direction) feeds and moves (both are not shown in the figure). ). The X-direction moving mechanism uses an X-direction feeding motor (not shown) composed of a stepping motor as a driving source, and the Y-direction moving mechanism uses a Y-direction feeding motor (not shown) composed of a stepping motor as a driving source.

The feeding table 15 is movable in the front-rear direction. What the position shown in the two-dot dash line among Fig. 1 represents is that feeding platform 15 is in sewing position SP (referring to Fig. 8), and the position shown in solid line represents that feeding platform 15 is in about 60 to 70 mm behind the punching position PP (refer to FIG. 8 ).

Next, the presser feet 27 and 28 for holding the object to be sewn on the upper surface of the feed table 15 will be described with reference to FIGS. 2 to 4 .

At the rear ends of the right cross-shaped plate 16 and the left cross-shaped plate 17 , swing levers 20 , 21 are swingably supported by pivot shafts 22 extending in the left-right direction via pivot blocks 23 . The rear ends of the presser rods 24 and 25 are respectively fixed to the upper ends of the swing rods 20 and 21 by bolts 3224a and 24b. To the front ends of the presser rods 24 , 25 , pivot bolts 26 are used to rotatably attach center portions in the front-rear direction of presser feet 27 , 28 .

The right part of the presser foot 27 in the right cross-shaped flat plate 16 is configured with a needle plate 60 and the cloth guide plate 30, while the left portion of the presser foot 28 in the left cross-shaped flat plate 17 is configured with a needle plate 61 and a cloth guide plate. Cloth board 31. The cloth guide plates 30, 31 respectively have long slotted holes 30a, 31a formed in the front and rear directions, and are installed on the cross-shaped flat plate 16, 17, the position adjustment of the front and rear directions can be carried out. Both the fabric guide plates 30, 31 are formed by bending their rear ends upward to form rear end position limiting portions 30b, 31b. The rear end position control parts 30b, 31b can position the front-back direction position of the lower side part Wc by abutting the rear ends of the lower side part Wc (see FIG. 10 ). In this way, by adjusting the installation positions of the cloth guide plates 30, 31 in the front-rear direction, the sewing position SP of the buttonhole stitch DN in the lower part Wc can be finely adjusted.

The lower end portions of the swing rods 20 and 21 are respectively located inside the feeding table 15, and U-shaped curved connection portions 20a and 21b are formed at the front end portions thereof. A connecting shaft 34 extending in the left-right direction is arranged inside the feed table 15 . Upper ends of clamping rods 35 and 36 are respectively fixed to both ends of the connecting shaft 34 , and rear ends of presser driving rods 37 and 38 are respectively fixed near the longitudinal center of the connecting shaft 34 . And, the front-end|tip parts of the said presser foot drive lever 37,38 are connected with the corresponding connection part 20a, 20b, respectively.

Pressing air cylinders 39 and 40 are disposed in the base portion 2 at the right portion of the right cross-shaped flat plate 16 and the left portion of the left cross-shaped flat plate 17 , respectively. A pivot pin 41 extending in the left-right direction supported by the feed table 15 is inserted through the front end portions of the pressing cylinders 39 and 40 . The pressing air cylinders 39 and 40 are free to swing around the pivot pin 41 . The piston rods 39a, 40a of the pressing air cylinders 39, 40 extend rearward from the rear end portions of the air cylinders 39, 40, respectively. Block-shaped coupling members 42, 43 are respectively fixed to rear end portions of the piston rods 39a, 40a. At the rear end portions of the coupling members 42 , 43 , the lower end portions of the clamp levers 35 , 36 are rotatably supported by pivot pins 44 .

Next, the operation of the presser feet 27, 28 when the piston rods 39a, 40a of the pressing cylinders 39, 40 retract and advance will be described with reference to Fig. 5 . In FIG. 5 , the retracted state of the piston rod 39 a of the pressing cylinder 39 is shown by a solid line, and the retracted state of the piston rod 39 a is shown by a two-dot chain line. In addition, arrows A1 to A3 in FIG. 5 represent operations of the respective parts when the piston rod 39a moves in and out. The piston rod 40a of the pressing air cylinder 40 also has the same structure, so the illustration is omitted.

As shown in Fig. 5, when the piston rods 39a, 40a of the pressing cylinders 39, 40 are in the retracted state, the upper ends of the swing rods 20, 21 are moved by the clamping rods 35, 36 and the presser foot driving rods 37, 38, respectively. Move backwards. As a result, the presser feet 27, 28 on the left and right rise to the upper retracted positions respectively, and when the piston rods 39a, 40a of the pressing cylinders 39, 40 are in and out, as shown in Fig. 3 and Fig. 4, the swing rod 20, The upper ends of 21 move forward respectively. As a result, the left and right pressers 27 , 28 rise to the lower pressing positions, respectively, and press the upper surfaces of the cross-shaped flat plates 16 , 17 through the needle plates 60 , 61 .

Next, the piece restricting members 50, 52 integrally attached to the presser feet 27, 28 will be described. First, the right side piece restricting member 50 provided on the left presser foot 27 will be described with reference to FIGS. 2 to 4 and 6 .

The right panel restricting member 50 is an integral structure formed by bending a single metal plate. Specifically, the right panel restricting member 50 is composed of a vertical plate-shaped pivot portion 50a located in the rear half, a horizontal plate-shaped lower restricting plate portion 50c and an upper restricting plate portion 50e located in the front half. A screw hole 50b is formed on the pivot portion 50a. The lower side regulating plate part 50c regulates the upper side panel part Wb (refer FIG. 10) of the opening part Wa of the rear pocket P from below. The upper restricting plate portion 50e restricts the upper panel portion Wb from above. Further, at the rear end portion of the upper side regulating plate portion 50e, a rear end regulating portion 50d composed of a vertical wall for positionally regulating the rear end of the upper panel portion Wb is provided.

The rear end restricting portion 50d is located in front of the front end of the presser foot 27 . The front end portion of the lower restricting plate portion 50c protrudes a predetermined length forward of the front end of the upper restricting plate portion 50e. The right panel restricting member 50 having the above structure is rotatably attached to the front end portion of the presser bar 24 together with the presser foot 27 via the pivot bolt 26 inserted through the screw hole 50b. That is, the right panel restricting member 50 rotates integrally with the presser foot 27 .

On the other hand, the left panel restricting member 52 has the same left-right symmetrical shape as the right panel restricting member 50 described above. That is, the left panel restricting member 52 is also an integral structure formed by bending one metal plate, and includes a pivot portion 50a having a screw hole 50b, a lower restricting plate portion 50c, a rear end restricting portion 50d, and an upper restricting plate. Section 50e. Further, the left panel restricting member 52 is rotatably attached to the front end portion of the presser bar 25 together with the presser foot 28 via the pivot bolt 26 inserted through the screw hole 50b. Also, like the right panel restricting member 50 , the rear end restricting portion 50 d of the left panel restricting member 52 is located in front of the front end of the presser foot 28 .

As shown in Fig. 3 and Fig. 4, when the cloth restricting members 50, 52 and the presser feet 27, 28 are in the state of descending to the pressing position, the two cloth restricting members 50, 52 are at the same position as when sewing ends. The sewing needle 5 that rises to the uppermost position is lower than the lower position. In this way, even if the upper panel part Wb restricted by these panel restricting members 50, 52 moves in the front-rear direction, the upper panel part Wb will not be caught by the sewing needle 5, and it is possible to reliably prevent the upper panel part Wb from being caught by the sewing needle 5. The resulting upper fabric portion Wb is damaged.

Also, between these piece restricting members 50, 52, that is, between the upper restricting plate portions 50e, 52e located on the sewing needle 5 side, a gap S having a left-right dimension sufficient for the sewing needle 5 to pass through is provided (see FIG. 6 ). . In this way, the sewing needle 5 can pass through the piece restricting members 50 , 52 even if the feed table 15 moves in the front-rear direction while the piece restricting members 50 , 52 are raised together with the presser feet 27 , 28 .

Next, the sheet restricting members 50 and 52 having the above-mentioned structure will be described with reference to FIGS. 1 , 7 and 8 .

First, when the sewing of the buttonhole stitch DN is started, the feed table 15 is rotated to the forward sewing position shown by the two-dot chain line in FIG. 1 . When the piston rods 39a, 40a of the pressing air cylinders 39, 40 are switched to the retracted state, the left and right pressers 27, 28 are raised to the upper retracted positions, respectively. At this time, between the left and right pressers 27, 28, a seam forming region HE shown by the two-dot chain line in FIG. 8 is formed, and the sewing needle 5 is at the sewing start position of the stitch forming region HE.

After the above-mentioned preparations for starting sewing are completed, the operator places the object to be sewn on the feed table 15 . Next, the rear panel W shown in Fig. 10 will be described as a sewing object.

As shown in FIGS. 7 and 8 , the operator inserts the lower part Wc of the rear panel W between the fabric guide plates 30, 31 and the presser feet 27, 28 so that the inner side thereof is positioned upward and the opening Wa is positioned. The shape of the rear. The operator holds the vicinity of the opening Wa of the upper cloth portion Wb horizontally with both hands while stretching it to the left and right, and places it on the lower restricting plate portions 50c, 50c, The upper surface of the front end portion of 52c is further moved backward until the end portion on the opening Wa side of the upper panel portion Wb abuts against the rear end restricting portions 50d and 52d. Thereby, the upper side piece part Wb is inserted between the lower side restriction plate part 50c, 52c and the upper side restriction board part 50e, 52e.

At this time, since the front ends of the lower restricting plate portions 50c, 52c protrude forward more than the front ends of the upper restricting plate portions 50e, 52e, the upper restricting plate portions 50e, 52e are not hindered, and the upper restricting plate portions 50e, 52e are not obstructed. The cloth part Wb is placed on the front end parts of the lower side restricting plate parts 50c and 52c. In this way, the upper panel part Wb can be easily placed on the panel restricting members 50, 52, and workability can be improved.

Then, while expanding the opening Wa with both hands, the operator stretches the vicinity of the opening Wa of the lower part Wc to the left and right and holds it in a horizontal shape, and then pulls the lower part Wc on the side of the opening Wa. The ends of the fabric guide plates 30, 31 move backward until they abut against the rear end position limiting portions 30b, 31b of the fabric guide plates 30, 31.

Here, as shown in FIG. 7, the upper part Wb and the lower part Wc are connected by a thin cloth Wd for pockets. In this case, since the lower restricting plate parts 50c and 52c are long, the folded part toward the rear of the thin cloth Wd is inserted below the presser feet 27 and 28 .

Next, the operator turns ON the presser foot operation switch (not shown). As a result, the piston rods 39a, 40a of the pressing air cylinders 39, 40 are switched in and out, and the left and right pressers 27, 28 respectively descend to the lower pressing position to press the lower garment part Wc. At this time, since the upper restricting plate portions 50e, 52e are provided on the needle 5 side (inner side) away from the lower restricting plate portions 50c, 52c, as shown in FIGS. 8 and 9, the upper panel portion Wb The vicinity of the sewing needle 5 is restricted by the upper side limiting plate portions 50e, 52e, and will not be caught by the sewing needle 5.

Then finally operate the start and stop switch, and according to the sewing data of the buttonhole seam selected in advance, the buttonhole stitch DN is sewn on the prescribed sewing position of the lower side part Wc.

Thus, according to the present embodiment, the following effects can be obtained.

When the eyelet buttonhole stitch DN is sewn, the rearward movement of the upper side cloth part Wb is restricted by the rear end restricting parts 50d, 52d, while the upper and lower position of the upper cloth part Wb is controlled by the upper and lower restricting plate parts 50c, 52e, 52c, 52e limited. The upper side panel portion Wb is not close to the seam forming region HE of the lower side piece portion Wc. Thereby, there is no need for the troublesome work of pulling the upper side panel portion Wb toward the front side in order not to cause trouble in sewing the buttonhole stitch DN.

In addition, with the above structure, it is possible to prevent the upper side piece portion Wb from being caught in the presser foot, and to reliably prevent it from being sewn by the sewing needle. As a result, the workability of the sewing operation can be greatly improved.

In addition, after the eyelet buttonhole stitch DN is sewn on the lower side part part Wc, in the state where the upper side part part Wb is pressed by the left and right pressers 27, 28, even if the feed table 15 starts sewing When the position SP has moved to the press position PP (see FIG. 8 ) about 60 to 70 mm behind, the upper panel portion Wb may be kept in a state restricted by the left and right panel restricting members 50 , 52 . Thus, when the feed table 15 moves backward, the sewing needle 5 does not come into contact with the upper panel portion Wb, and even after the feed table 15 moves to the pressing position PP, the upper panel portion Wb does not come into contact with the lower panel portion Wb. The punched area of the buttonhole on the side panel portion Wc is approached.

In this way, when the feed table 15 moves from the sewing position SP to the pressing position PP, or when the buttonhole hammer 13 is pressing the round buttonhole 10a, the operator does not need to use his hands to press the upper side. The troublesome work of stretching the sheet portion Wb by avoiding it toward the front side can improve workability.

Also, a pair of cloth restricting members 50, 52 are respectively detachably provided on the left and right pressers 27, 28, so the cloth restricting members 50, 52 can be removed when unnecessary or troublesome.

In addition, a gap S through which the sewing needle 5 can pass is provided between the left and right pair of cloth restricting members 50, 52. When the feed table 15 moves in the front-rear direction, the sewing needle 5 will not collide with the cloth restricting members 50, 52. Collision or interference, can improve the safety of sewing operation.

In addition, the piece restricting members 50 , 52 are attached to the front ends of the presser bars 24 , 25 together with the presser feet 27 , 28 via pivot bolts 26 . As a result, the pivot bolt 26 can be effectively used to facilitate the installation of the presser feet 27 , 28 on the presser bar 24 , 25 . Moreover, by integrally attaching the piece restricting members 50, 52 and the presser feet 27, 28, the positional relationship of the upper side piece part Wb with respect to the presser feet 27, 28 can be ensured reliably.

In addition, this invention is not limited to the said Example, For example, the following deformation|transformation is possible.

1) The cloth restricting members 50, 52 may have upper restricting plate portions 50e, 52e, rear end restricting portions 50d, 52d, and lower restricting plate portions 50c, 52c formed in a lateral U-shape in side view. Also, the rear end restricting portions 50d, 52d may be omitted. In this case, the upper restricting plate portions 50e, 52e and the lower restricting plate portions 50c, 52c may have a V-shaped structure in a lateral view.

2) The sheet restricting members 50 and 52 are not limited to one pair, and may be three or one sheet restricting member.

3) The piece restricting members 50, 52 may be formed separately from any one of the upper restricting plate portions 50e, 52e, the rear end restricting portions 50d, 52d, and the lower restricting plate portions 50c, 52c.

4) The cloth restricting members 50, 52 may be directly fixed to the presser feet 27, 28, or the cloth restricting members 50, 52 and the presser feet 27, 28 may be integrally formed.

5) The cloth restricting members 50 and 52 may be made of materials other than metal such as synthetic resin fingers and acrylic substrates. In addition, when the cloth restricting member is composed of synthetic resin fingers and an acrylic substrate, a transparent material can also be used.

6) The cloth restricting members 50, 52 may have a configuration in which the lower restricting plate portions 50c, 52c are arranged closer to the sewing needle 5 than the upper restricting plate portions 50e, 52e.

7) The piece restricting members 50, 52 may have a structure in which the upper restricting plate portions 50e, 52e and the rear end restricting portions 50d, 52d are butted against each other (pressed position) and elastically applied. According to this structure, the lower part part Wc inserted between the upper side restricting plate part 50e, 52e and the lower side restricting plate part 50c, 52c can be clamped elastically.

8) A piece detection sensor for detecting whether the upper piece part Wb has been placed may also be provided on the piece restricting members 50 and 52. When sewing starts, if the upper piece part Wb is not placed If the specified position is not reached, this information will be reported or the sewing operation will be prohibited.

9) The present invention is applicable to various eyelet buttonhole sewing machines for sewing eyelet eyelet stitches with looper needles.

10) In addition, various changes may be added to the present invention based on existing technologies and technologies known to those in the industry.

Claims (8)

1. A buttonhole sewing machine comprising: a feed table for placing an object to be sewn; a presser foot for pressing the object to be sewn placed on the feed table; The sewing needle and the looper for forming buttonhole stitches in the stitch forming region of the object to be sewn on the feed table are characterized in that A piece of fabric restricting member is provided, which is detachably mounted on the presser foot and is rotatably mounted on the presser foot bar on which the presser foot is mounted, and is provided in the opening having a preformed opening. When a buttonhole stitch is formed on one side of the opening in the object to be sewn, the other side of the opening can be restricted so that it does not overlap with the one side of the opening. The stitch formation area is close. 2. The eyelet buttonhole sewing machine according to claim 1, wherein the presser foot is composed of a pair of presser feet, The cloth restricting member is constituted by a pair of cloth restricting members detachably provided on the pair of presser feet, respectively. 3. The eyelet buttonhole sewing machine according to claim 2, wherein the pair of presser feet are in a state of pressing both sides of the stitch forming region in the object to be sewn, A gap through which the sewing needle can pass is provided between the pair of sheet restricting members as the feed table moves. 4. The buttonhole sewing machine according to claim 1, wherein the piece restricting member has an upper restricting plate portion and a lower restricting plate portion for restricting the other side cloth portion from the upper and lower sides. a side restricting plate portion; and a rear end restricting portion for restricting a rear end position of the other side panel portion. 5. The buttonhole sewing machine according to claim 4, wherein the piece restricting member is integrally formed of a single metal plate, and the upper restricting plate portion is provided at a lower position than the lower restricting plate. the side closer to the needle. 6 . The buttonhole sewing machine according to claim 5 , wherein a front end portion of the lower restricting plate portion protrudes forward of a front end portion of the upper restricting plate portion. 7 . 7. The eyelet buttonhole sewing machine according to claim 6, further comprising a presser foot bar on which said presser foot is mounted via a pivot shaft, The cloth piece restricting member is attached to the presser foot lever, and rotates integrally with the presser foot via the pivot shaft. 8. A piece of cloth restricting member provided in a buttonhole sewing machine, the buttonhole sewing machine comprising: a feeding table for placing an object to be sewn; A presser foot for pressing an object to be sewn; a sewing needle and a looper for forming eyelet keyhole stitches in a stitch forming region of the object to be sewn placed on the feed table, characterized in that, A restricting portion is provided, which is detachably mounted on the presser foot and rotatably mounted on the presser foot bar on which the presser foot is mounted, and the sewing object having a pre-formed opening When a buttonhole stitch is formed on one side of the opening in the object, the other side of the opening can be restricted from being in contact with the one side pressed on the feeding table. The stitch formation area of the panel part is close.

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