JP2002095879A - Cloth-cutting blade device for hole-darning sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloth-cutting blade device for a hole-darning sewing machine, which can form a button hole by carrying out a plurality of times of cloth-cutting operation by using a short cloth-cutting blade even in the case of forming a long button hole. SOLUTION: The hole-darning sewing machine is comprised of a sewing machine frame, a needle bar, a cloth feeding plate, a cloth retainer, a retaining arm, an upper shaft, and a blade rod. The sewing machine frame includes a bed section having a horizontal bed surface, a vertical trunk portion erected from the bed section, an arm portion extending frontward from the vertical trunk portion along the bed section almost in parallel therewith, and an arm jaw portion protruding downward from a front portion of the arm portion. The needle bar downward protrudes from the arm jaw portion to carry out vertical movement and sidewise rocking operation orthogonally to an extending direction of the arm portion. The cloth feeding plate moves cloth for sewing in a direction orthogonal to the rocking direction of the needle bar set at the bed section. The cloth retainer retains the cloth for sewing in cooperation with the cloth feeding plate. The retaining arm includes the cloth retainer at a front end on the side of the arm jaw portion, and extends from the arm jaw portion toward the vertical trunk portion. The upper shaft vertically drives the needle bar set at the arm portion. The blade rod has a cloth-cutting blade for cutting the cloth for sewing, at a lower end of the rod, and carries out vertical movement. According to the sewing machine thus constructed, the blade rod is arranged on the right side of the upper shaft and the needle bar when the vertical trunk section is viewed from the side of the arm jaw portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth cutting knife device for a buttonhole sewing machine for sewing buttonholes, and in particular, a plurality of buttonholes having different lengths can be formed with one cloth cutting knife without replacing the cloth cutting knife. The present invention relates to a cloth cutting knife device that can be formed.

[0002]

2. Description of the Related Art A conventional cloth cutting knife device of this kind of a hole hoist sewing machine is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 11-9860, and will be described with reference to FIGS. In FIG. 3, reference numeral 101 denotes a sewing machine frame, which includes a bed 102 having a horizontal bed surface, a vertical trunk 103 standing upright from the bed 102, and a bed 10 extending from the vertical trunk 103.
Arm portion 104 extending forward substantially parallel along 2
The arm 104 includes an arm jaw 105 projecting downward from a front portion of the arm 104.

A needle bar 6 has a needle 7 at its lower end, and is supported by a needle bar swing table 8 that swings left and right around a fulcrum shaft 8a fixed to the arm jaw 105 so as to be able to move up and down. The arm protrudes downward from the arm jaw 105, and is vertically moved by a crank mechanism 13 provided at the front end of an upper shaft 12 that is rotationally driven by a servomotor 11, and a horizontal direction orthogonal to the extending direction of the arm 104. The needle bar swing mechanism (not shown) swings through a needle bar swing shaft 9, a needle bar swing arm 10, and a needle bar swing table 8.

Reference numeral 121 denotes a cloth feed plate; and 122, a presser arm. Each of the presser arms is connected to a ball screw nut member 125 and driven by a pulse motor 126 and a ball screw shaft 127. 2) cooperates with a presser foot 24 attached to the front end of the needle bar 6 via a presser foot 23 to move the sewing object in the front-rear direction orthogonal to the swinging direction of the needle bar 6.

[0005] Reference numeral 131 denotes a female rod, as shown in FIG. 4, an air cylinder 132 connected to the upper end of the female rod 131.
The cloth cutting knife 34 whose blade length (blade width) is shorter than the length of the parallel portion of the buttonhole stitch is attached to the knife mounting base 133 fixed at the lower end with the screw 33a with the screw 33a. The arm jaw 105 is provided on the arm jaw 105 so as to be vertically movable while being guided by female rod guides 141 and 142 fixed to the arm jaw 105. Reference numeral 135 denotes a female rod return spring that raises and returns the female rod 131.

Reference numeral 51 denotes a shuttle attached to the front end of the lower shaft 52, and includes gears 12a and 53a, a longitudinal axis 53, and gears 53b and 52.
a, The upper shaft 12 is driven to rotate by the rotation of the upper shaft 12 via the lower shaft 52, and forms a stitch of the button hole in cooperation with the needle 7.

FIG. 5 is a partial view of FIG. 3 as viewed from the side of the arm jaw 105 (referred to as the front side) to the side of the vertical trunk 103 (referred to as the rear side). This shows the positional relationship with. The scalpel bar 131 is located outside the left and right swing range of the needle bar swing table 8 that supports the needle bar 6, and is viewed from the front side.
Of the needle bar 6, which is located outside the left and right swing range of the needle bar 6 and is also located on the left side of the needle bar 6 when viewed from the front side.
22 and in the left-right direction.

FIG. 6A shows the names of the buttonhole buttonhole stitching portions. The left and right sides of the buttonhole are a left parallel portion (left side sewing portion) and a right parallel portion (right side sewing portion). Before and after are a first bar-tacking section (rear bar-tacking section) and a second bar-tacking section (front bar-tacking section). Such a buttonhole overlock sewing is performed by a buttonhole overlock sewing machine having the above configuration, and in the case of clockwise sewing, as shown in FIG.
The sewing starts from the left side of the second bar-tacking portion, returns to the left parallel portion, the first bar-tacking portion, the right parallel portion, and the second bar-tacking portion, and performs bar-tacking, thereby forming a buttonhole buttonhole stitch.

At this time, the cloth feed plate 121, the cloth presser 24, and the presser arm 122, which hold the sewing object, are on the rear side (the vertical trunk 1).
03 side) to the front side (arm jaw 105
Side), and when the stitch at the rear end d of the first bar-tacking portion is formed, the direction of movement is changed to the opposite direction, and the moving direction is reversed toward the rear side to return to the original position.

[0010] As shown in Fig. 6 (C), sewing starts from the right side of the second bar-tacking portion, and returns to the right parallel portion, the first bar-tacking portion, the left parallel portion, and returns to the second bar-tacking portion. Sewing is also selectively possible.

Next, the operation of the conventional cloth cutting knife device of the holing machine will be described with reference to FIG. As shown in FIG. 7A, the length of the right parallel section sewing (left parallel section sewing in the case of counterclockwise sewing) from the front end e of the first bar tacking section is the length of the cloth cutting knife 3.
When the length becomes equal to the length (blade width) of the air cylinder 132, the air cylinder 132 is driven by control means (not shown),
The knife rod 131 descends, and the first descending operation of the cloth cutting knife 34 is performed.
As shown in FIG. 7 (B), it is raised and returned by the knife rod return spring 135, and as shown in FIG. 7 (C), the seam is further formed in the right parallel portion while feeding the workpiece to the rear side (in the direction of the arrow). Thereafter, the cloth cutting knife 34 is moved down again. By repeating the lowering operation of the cloth cutting knife 34 a plurality of times, a button hole having a predetermined length can be formed.

That is, the buttonhole having a length corresponding to the length of the parallel portion is formed by a plurality of vertical movements of the cloth cutting knife 34 whose blade length is shorter than the length of the parallel portion of the buttonhole overlock stitch. Therefore, a buttonhole having an arbitrary length within a predetermined range can be formed by one kind of cloth cutting knife 34. Therefore, within a certain range, there is no need to replace the cloth cutting knife even by changing the length of the buttonhole, and it is not necessary to prepare a large number of cloth cutting knifes of the type corresponding to the length of the buttonhole.

[0013]

However, a cloth cutting knife device for a hole hogging machine that can form a plurality of button holes having different lengths with one cloth cutting knife without replacing this kind of cloth cutting knife. In cutting a long buttonhole having a length exceeding a certain range by a plurality of cloth cutting operations using a cloth cutting knife having a short length, as shown in FIG. 122 is disposed on the left side of the needle bar 6 when viewed from the front side and overlaps in the left-right direction, so that when the female bar 131 is lowered, the lower end portion 131a of the female bar 131 rises 122a of the presser arm 122. , The cloth cutting knife 34 does not descend sufficiently, so that a button hole cannot be formed.

That is, as shown in FIG. 8, the longer the buttonhole length, the larger the amount of advance of the presser arm 122 in the direction of arrow A, and the more the cloth cutting knife 34 is moved from the front end e of the first bar-tacking portion. Since the first descent is performed when the length of the parallel portion sewing (the presser arm 122 starts to retreat) is at least the same as the length of the cloth cutting knife 34, the shorter the length of the cloth cutting knife 34, the more the cloth Since the amount of retraction of the presser arm 122 from the most advanced position at the time of the first descending operation of the cutting knife 34 is small, the rising portion 122a of the presser arm 122 comes closer to the lower end portion 131a of the knife rod 131, and is indicated by a chain line. As shown by, there occurs a problem that the lower end portion 131a of the scalpel bar 131 contacts the rising portion 122a of the holding arm 122 when the cloth cutting knife 34 is lowered.

[0015] For this reason, in the conventional cloth cutting knife device of the holing machine, the rising portion of the presser arm is moved to the vertical trunk side (rear side).
And the length of the scalpel that can be used is limited. However, if the rising part of the presser arm is moved to the rear side, when the sewing object is guided by hand at the rear end side of the cloth presser, the rising part will interfere with the sewing work. Properties were significantly reduced. Also, when the length of the cloth cutting knife is limited, when sewing a button hole shorter than the length of the restricted cloth cutting knife, it is necessary to replace the button hole with a cloth cutting knife shorter than the restricted length. Work efficiency was reduced.

[0016]

In order to solve the above-mentioned problems, the present invention according to claim 1 comprises a bed portion (2) having a horizontal bed surface, as shown in FIGS. ), An arm (4) extending substantially parallel forward from the vertical body (3) along the bed (2), and a lower part from the front of the arm (4). A sewing machine frame (1) having an arm jaw (5) projecting from
A needle bar (6) that projects downward from the arm jaw (5) and moves up and down, and swings in the horizontal direction perpendicular to the direction in which the arm (4) extends, and a needle provided on the bed (2). A cloth feed plate (21) for moving the workpiece in a direction perpendicular to the swinging direction of the rod (6), a cloth presser (24) for cooperating with the cloth feed plate (21) and pressing the workpiece. A presser foot (24) is provided at the front end of the arm jaw (5), and a presser arm (22) extending from the arm jaw (5) side to the vertical trunk (3) side; An upper shaft (1) for driving the needle bar (6) up and down
2) and a cloth cutting knife (3
4) In a hole hog sewing machine provided with a female bar (31) that is mounted and moves up and down, the female bar (31) is moved upward when the vertical jaw (3) side is viewed from the arm jaw (5) side. Shaft (1
2) and is arranged on the right side of the needle bar (6).

According to the first aspect of the present invention, the female rod is
The arm is located to the right of the upper shaft and the needle bar when viewed from the arm jaw side to the vertical torso side. When the knife bar is lowered, the tip of the knife bar is held down regardless of the position of the holding arm. It does not come into contact with the rising part of the cloth, and it is possible to use a cloth cutting knife with a short length even for a long buttonhole with a length exceeding a certain range, which limits the length of the usable cloth cutting knife. This eliminates the need for the rising portion of the presser arm to have a shape shifted to the vertical trunk portion.

According to a second aspect of the present invention, in the cloth cutting knife apparatus of the first aspect, the actuator (air cylinder 32) for driving the knife rod (31) includes, as shown in FIG. Looking at the vertical torso (3) side from the arm jaw (5) side, the scalpel (3)
It is characterized by being arranged on the opposite side of 1).

According to the second aspect of the present invention, the actuator for driving the female rod can be arranged on the side opposite to the female rod with respect to the upper shaft when the vertical torso side is viewed from the arm jaw side. In addition to the effect of the first aspect of the invention, when the sewing manufacturer sits on the right side of FIG. 2 and works, the operator's head touches the actuator during the sewing operation or gives the operator a feeling of oppression. Can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 and 2 show a main part of a cloth cutting knife device of a holing machine showing an embodiment of the present invention. The same components as those of the prior art are not shown or the same symbols are added and the description is omitted. I do. In FIG. 1, reference numeral 1 denotes a sewing machine frame, a bed portion 2 having a horizontal bed surface, a vertical trunk portion 3 rising from the bed portion 2, a vertical trunk portion 3.
And an arm jaw 5 protruding downward from a front portion of the arm 4.

Reference numeral 6 denotes a needle bar having a needle 7 at a lower end thereof, and a needle bar swinging right and left in a direction perpendicular to the extending direction of the arm 4 around a fulcrum shaft 8a fixed to the arm jaw 5. It is vertically movably supported by the swing table 8, protrudes downward from the arm jaw 5, and is vertically moved by a crank mechanism 13 provided at the front end of an upper shaft 12 driven to rotate by a servomotor. The needle bar swings in the left and right directions via a needle bar swing shaft 9, a needle bar swing arm 10, and a needle bar swing table 8 by a needle swing mechanism shown in the figure.

Reference numeral 27 denotes a cloth feed shaft, which is provided with a rack (not shown) at a part of a front portion on the arm jaw 5 side (referred to as a front side), and a pinion gear 2 fixed to a shaft of a pulse motor 26.
By meshing with the needle bar 6a, the needle bar 6 is driven in the front-rear direction orthogonal to the swinging direction of the needle bar 6 by the rotation of the pulse motor 26. The cloth feed arm 25 is fixed to the cloth feed shaft 27, and the cloth feed plate 21 and the holding arm support arm 28 are fixed to the cloth feed arm 25.

Reference numeral 22 denotes a presser arm. A rear end of the vertical torso 3 (hereinafter referred to as a rear side) is supported by a presser arm support arm 28 so as to be vertically swingable, and a presser foot 23 is provided at a front end. Hand cloth foot 24
Is mounted, and cooperates with the cloth feed plate 21 to move the sewing object in the front-rear direction.

Reference numeral 37 denotes a knife drive lever, which is pivotally movable about a fulcrum shaft (not shown) fixed to the arm 4.
It is provided in. One end 37a of the knife drive lever 37
Is disposed on the left side of the upper shaft 12 when viewed from the front side, and is connected to one end of the connection link (A) 36. The other end of the connection link (A) 36 is connected to the upper shaft 12 when viewed from the front side. It is connected to a connection arm (A) 32a fixed to a shaft of an air cylinder 32 disposed on the left side. Female drive lever 37
Is disposed on the right side of the upper shaft 12 when viewed from the front side, and is connected to one end of the connection link (B) 38. The other end of the connection link (B) 38 is connected to the connection arm ( B) 39
Is linked to

Reference numeral 31 denotes a scalpel bar, which is vertically movably disposed on the upper shaft 12 and the arm 4 on the right side of the needle bar 6 when viewed from the front side, and is provided at the center with the other end of the connecting link (B) 38. The connected connecting arm (B) 39 is fixed.

Reference numeral 40 denotes a knife drive arm, one end of which is a knife rod 31.
Is fixed to the lower end portion, and the other end is fixed with a screw with a female mounting base 33, and the female mounting base 33 has a blade length (blade width) longer than the length of the parallel portion of the buttonhole overlock stitch. Is attached with a screw 34a.

FIG. 2 is a partial view of FIG. 1 as viewed from the front side to the rear side, and shows the positional relationship between the knife bar 31 and the knife drive arm 40 and the needle bar 6 and the presser arm 22. The scalpel bar 31 is disposed on the right side of the needle bar 6 when viewed from the front side.
Outside of the right and left swing range, the pressing arm 22 disposed on the left side of the needle bar 6 does not overlap in the left-right direction. Also, the left side surface 40a of the other end of the female drive arm 40
The presser arm 22 has a positional relationship that does not overlap in the left-right direction.

The embodiment of the present invention is configured as described above, and the operation will be described below with reference to FIGS. 1, 2, and 7. FIG. 7 (A)
As shown in the figure, the length of the right parallel section sewing (left parallel section sewing in the case of counterclockwise sewing) from the front end e of the first bar-tacking portion is at least the same as the length (blade width) of the cloth cutting knife 34. At this time, the air cylinder 32 is driven in the direction of arrow C by control means (not shown), the knife drive lever 37 rotates counterclockwise in FIG. 1, and the other end 37b of the knife drive lever 37 moves downward. Due to the rotation, the knife rod 31, the knife drive arm 40, and the knife mount 33 are lowered, and the first lowering operation of the cloth cutting knife 34 is performed. Driven in the direction of arrow D, FIG. 7 (B)
The cloth cutting knife 34 is raised and returned as shown in FIG.
As shown in (C), while the sewing material is further fed to the rear side (in the direction of the arrow) to form a stitch in the right parallel portion, the cloth cutting knife 34 is again moved down. By repeating the lowering operation of the cloth cutting knife 34 a plurality of times, a button hole having a predetermined length can be formed.

At this time, as shown in FIG.
Is disposed on the right side of the upper shaft 12 and the needle bar 6 when viewed from the front side, and the pressing arm 2
2 does not overlap in the left-right direction, so that when the knife rod 31 and the knife drive arm 40 descend,
Regardless of the position of the presser arm 22, the lower ends of the scalpel bar 31 and the scalpel drive arm 40 do not come into contact with the rising portion 22a of the presser arm 22. It is possible to use a cloth cutting knife having a short length.

As shown in FIG. 1, one end 37a of the knife drive lever 37 is disposed on the left side of the upper shaft when viewed from the front, and the other end 37b is disposed on the right side of the upper shaft 12 when viewed from the front. The air cylinder 32 that drives the female rod 31
Can be arranged on the left side of the upper shaft 12, and the female rod 31 can be arranged on the right side of the upper shaft 12.

The present invention is not limited to the above-described embodiment. For example, the air cylinder for driving the measuring rod may be constituted by an actuator such as a solenoid or a pulse motor.

[0032]

According to the first aspect of the present invention, the female bar is disposed on the right side of the upper shaft and the needle bar when the vertical torso is viewed from the arm jaw side. The lower end of the scalpel bar does not touch the rising part of the presser arm, regardless of the position of the presser arm during the lowering of the presser arm. It is possible to use a scalpel, and there is an excellent effect that there is no need to limit the length of a scalpel that can be used or to make the rising portion of the presser arm move to the vertical trunk portion side.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the actuator for driving the female rod can be arranged on the left side of the upper axis and on the opposite side of the female rod with respect to the upper axis when viewing the vertical torso side from the arm jaw side Therefore, when the sewing manufacturer sits on the right side of FIG. 2 and works,
The operator's head may touch the actuator during sewing
There is an excellent effect that it is possible to prevent an operator from feeling tight.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a cloth cutting knife device of a hole holing machine according to an embodiment of the present invention.

FIG. 2 is a partial side view of a main part of the cloth cutting knife device of the overhole sewing machine according to the embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a conventional cloth cutting knife device of the holing machine;

FIG. 4 is a partial perspective view of a conventional cloth cutting knife device of the holing machine;

FIG. 5 is a partial side view of a main part of a conventional cloth cutting knife device of the holing machine;

FIG. 6 is a plan view for explaining names of buttonhole overlock portions.

FIG. 7 is a perspective view illustrating dropping of the cloth cutting knife of the hole holing machine a plurality of times.

FIG. 8 is a partial front view of a main part of a conventional cloth cutting knife device of the holing machine;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 101 Sewing machine frame 2, 102 Bed part 3, 103 Vertical torso part 4, 104 Arm part 5, 105 Arm jaw part 6 Needle bar 8 Needle bar swing table 12 Upper shaft 21, 121 Cloth feed plate 22, 122 Pressing arm 22a, 122a Rising part 24 Cloth presser 31, 131 Female rod 32, 132 Air cylinder (actuator) 33, 133 Female mounting base 34 Cloth cutting female 36 Connection link (A) 37 Female drive lever 38 Connection link (B) 39 Connection arm (B) 40 female drive arm

Claims (2)

[Claims] 1. A bed having a horizontal bed surface, a vertical trunk rising from the bed, an arm extending substantially parallel forward from the vertical trunk along the bed, and A sewing machine frame having an arm jaw projecting downward from the front part, and a needle bar projecting downward from the arm jaw and moving up and down, and swinging in the left and right direction orthogonal to the extending direction of the arm part, A cloth feed plate provided on the bed portion for moving a sewing object in a direction orthogonal to a swing direction of the needle bar;
A cloth presser that presses the workpiece in cooperation with the cloth feed plate; a presser arm provided with the cloth presser at a front end of the arm jaw side, and extending from the arm jaw side to the vertical trunk side; A bobbin sewing machine provided with an upper shaft provided on the arm portion for driving the needle bar up and down, and a female bar mounted on a lower end portion of which a cloth cutting knife for cutting a sewing object is attached and moved up and down, A female stick looks at the vertical torso side from the arm jaw side,
A cloth cutting knife device for a hole hog sewing machine, which is disposed on the right side of the upper shaft and the needle bar. 2. An actuator for driving said measuring rod,
The cloth cutting knife device according to claim 1, wherein the sewing machine is disposed on the side opposite to the knife bar with respect to the upper shaft when the vertical trunk portion side is viewed from the arm jaw side.