JPS6013716B2 - Sewing machine with built-in fabric edge cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine equipped with a fabric edge cutting device that automatically cuts the edge of a workpiece cloth before overlocking the workpiece cloth fed to a sewing position on a sewing machine bed. It is.

Among conventionally well-known fabric edge cutting devices, all those applicable to general household sewing machines are of the attachment type, and so-called built-in type devices have not yet been proposed.

Regarding industrial sewing machines, there is a fabric edge cutting device that is used in overlock sewing machines (so-called overlock sewing machines), but since this sewing machine is a dedicated machine, the fabric edge cutting device is always used. It is placed in working condition and is not placed in idle condition. by the way,
In recent years, so-called compact lock sewing machines have been developed, functionally equivalent to the above-mentioned industrial overlock sewing machines, and structurally miniaturized with built-in electric motors, making them easy to carry and use anywhere. A large number of these machines have been commercialized, and they are used in conjunction with conventional household sewing machines and are considered useful in general households.

However, in the fabric edge cutting device used in such small lock sewing machines, although the movable blade itself is configured to be selectively moved between the use position and the inconvenience position, the fixed blade is is fixedly arranged on the throat plate, and the actuation of the fabric edge cutting device depends on whether the movable blade is placed in a position cooperating with the fixed blade. Inactivation is the one selected. This 4-type lock sewing machine is also a special machine for overlocking, and cannot be used in the same way as a general household sewing machine. This invention was made in consideration of the above-mentioned circumstances, and its main purpose is to easily implement it into a general household sewing machine, and to prepare it by a simple operation during use. It has a built-in fabric edge cutting device that performs the same cutting action as a cutting device and can smoothly and beautifully perform hem overlaying, and when it is inconvenient, it can be stored in the sewing machine bed and used in the same way as a conventional home sewing machine. Our goal is to provide sewing machines with the highest quality.

More specifically, a holder equipped with a fixed blade and a movable blade is selectively moved between a use position and a storage position by a support mechanism, and when placed in the use position, at least the movable blade is placed on the sewing machine bed surface. It is exposed through the upper sekiguchi and becomes in a state where it can cut the edge of the workpiece cloth by cooperation with the fixed blade, and it is possible to easily perform the hemlocking gutter while cutting the edge of the workpiece cloth, and in case of inconvenience. , it can be easily stored in the sewing machine bed, and the surface of the sewing machine bed can be effectively used to perform normal sewing work efficiently, and the holder can be secured by the locking means in case of inconvenience. The holder is held in a stored position in the sewing machine bed without being able to move against the action of the spring means, and there is no fear that the holder will wobble in the sewing machine bed, allowing normal sewing work to be performed in a stable state. When the lid that closes the opening □ on the surface of the sewing machine bed is opened, the action of the locking means is released by the release means provided between the lid and the locking means, and the holder is moved by the spring means. When it is moved from the storage position to the use position, at least the movable blade is automatically exposed on the sewing machine bed surface, and it is possible to easily and quickly start hemming the work cloth without requiring any troublesome preparation operations. An object of the present invention is to provide a sewing machine with a built-in novel cloth edge cutting device.

An embodiment of the present invention will be described below with reference to the drawings.
In the drawing, reference numeral 21 denotes a sewing machine arm, and a sewing machine needle 22 and a presser foot 23 are attached to the lower end of a needle bar and a presser bar attached to the top end of the arm.

The presser foot 23 in this embodiment is biased by a spring 24 to rotate clockwise in FIG. Reference numeral 25 denotes a sewing machine bed, on the upper surface of which a top plate 26 is fixed, and on the left end of the front surface a hook 27 is attached so as to be openable and closable.

Reference numeral 28 denotes a throat plate attached to the front part of the upper surface of the upper plate 26, and on the left side thereof there is a closing opening 28a for the feed dog 29 extending in the cloth feeding direction, and a throat plate 28a extending in a direction perpendicular to the cloth feeding direction. A needle hole 28b is formed, and a closing opening 288d for a cloth edge cutting device is formed in the front portion on the right side, which has a pair of guide support pieces 28c at the front and rear of the closing edge.

A lid body supported so as to be movable left and right on the guide support piece 28c so as to openably close the gate 28d for the Mitsukawa Maso cloth edge cutting device, as shown in FIGS. 1 and 2. When the sewing machine is opened to the right as shown in FIG.

Reference numeral 31 denotes an elastic engagement piece fixed to the left end of the lower surface of the lid body 30, and as shown in FIGS. A holding portion 31a is formed to engage with and irremovably hold the lid body 30 inside the closing opening 28d, and an engaging portion 31b is formed to hang down near the left front side.

Reference numeral 32 denotes a shuttle drive shaft in the movement mechanism of the sewing machine, which is rotatably supported within the sewing machine bed 25 so as to extend in a direction perpendicular to the cloth feeding direction, and as shown in FIG. A bevel gear 33 is fixed.

Reference numeral 34 denotes a rotating shaft rotatably supported within the sewing machine bed 25 so as to extend in the cloth feeding direction, and a driven bevel gear 35 that meshes with the driving bevel gear 33 on the shuttle drive shaft 32 is provided at the rear end. A hook 36 is attached to the front end of the sewing machine for sewing work cloth in cooperation with the sewing machine needle 22.

Next, the needle plate 28 is configured to have a use position exposed to the upper surface of the sewing machine bed 25 through the closing opening 28d of the needle plate 28, and a storage position located below the upper surface of the sewing machine bed 25.
The configuration of the fabric edge cutting device installed in the sewing machine bed 25 will be described.

481 is a movable plate attached to the bottom inner surface of the sewing machine bed 25 through a long hole 40a by a pair of stepped screws 41 so as to be movable in a direction perpendicular to the cloth feeding direction. As shown in the figure and FIG.
A pair of /titch portions 48c are formed at a predetermined interval in the left-right direction at the front and back near the right end.

Reference numeral 42 denotes a notch shaped like a horizontal U in plan, which is attached to the inner surface of the bottom of the sewing machine bed 26 by means of a mounting screw 43, and has a notch portion 40c at its tip that is selected as the movable plate 40 moves from side to side. The engaging portion 42a is bent to restrict the moving Q to the left use position shown in FIGS. 2 and 3 and the right storage position shown in FIG. has been done.

44 is a pair of support legs 44a provided at the right end portion, and a support shaft 45 extending horizontally in the front-rear direction allows the movable plate 4 to be
As shown in FIGS. 2 and 3, the holder is rotatably supported by a support piece 40b of 0, and a bearing portion 44b that opens downward is formed at the rear of the holder, and the rear end of the right side An engaging surface 44c is formed at the lower portion, and a locking protrusion 44d is formed protrudingly between the pair of support legs 44a.

The movable plate 40 and the support shaft 45 constitute a support mechanism for movably supporting the holder within the sewing machine bed 25. The tortoise 6 is a coil spring as a spring means wound around the support shaft 45, and both ends of the tortoise 6 are hooked to one of the support pieces 40b of the movable plate 40 and the locking protrusion 44d of the holder 44, respectively. , the holder 44 is urged to rotate clockwise from the storage position in the sewing machine bed 25 shown in FIG. 47 is support pin 4
8 is a locking bar rotatably supported by one support piece 40b of the movable plate 40, and as shown in FIG. 3 and FIG. A locking claw portion 47a is formed to engage with the locking protrusion 44d of the holder 44 to hold the holder 44 in the storage position against the action of the coil spring 46. The spring stop portion 47b is formed in a bent manner.

Reference numerals 49 indicate the spring locking portion 47b of the locking bar 47 and the movable plate 40;
A tension spring is hung between the support piece 40b and one of the support pieces 40b, and urges the locking bar 47 to rotate in the counterclockwise direction in FIGS. The holder 44 is held in the storage position shown in the figure by the engagement between the claw portion 47a and the locking protrusion 44d of the holder 44.

The locking bar 47 and the tension spring 49 constitute the locking means of this embodiment. Also, at the upper end of one arm of the locking bar 47, a release protrusion 47c is provided. As is clear from FIGS. 6 and 7, when the lid body 30 is opened, the engaging portion 31b of the engaging piece 31 provided on the lower surface of the rhombic body 38 engages with this release protrusion 47c. The locking bar 47 is rotated against the action of the tension spring 49 so that the engagement with the locking protrusion 4 of the holder 44 is disengaged, and the holder 44 is moved against the coil spring 46. 6.The engagement piece 31 therefore constitutes the release means of this embodiment.50, 53 are A pair of engaging protrusions are formed on the front left end and the rear right end of the holder 44, respectively, and when the holder 44 is rotated clockwise from the storage position as described above, the needle plate 28
The holder 44
is regulated and held in a state where it is slightly exposed on the upper surface of the sewing machine bed 25 from the closing opening 26d.

Reference numerals 52 and 53 denote a pair of guide plates respectively fixed to the lower surface of the throat plate 8 in the vicinity of both the engaging protrusions 28d,
As shown in FIGS. 2, 3, 4, and 6, the movable plate 48 is opened toward the entrance 28d side and the right side, and the movable plate 48 is moved to the sixth position with the holder 44 exposed from the opening 28d.
When the guide plate 6 is moved from the storage position shown in the figure to the left side toward the use position shown in FIG.
2, 53 and the guide support piece 28c, and holds the holder 44 in the use position so as not to be able to move up and down.

Reference numeral 54 denotes an engagement plate attached to the bottom of the holder 44, and as shown in FIGS. 3, 4, 6, and 8, an engagement protrusion 54a having a substantially horizontal mountain shape is provided on the left side of the engagement plate. An engagement hole 54b is formed on the upper surface of the engagement protrusion 54a, and a cam-shaped guide piece 54c that becomes lower toward the left is bent on the rear side.

55 is a sewing machine bed 2 corresponding to the engaging plate 54.
5, which has a horizontal mountain-shaped restraint part 55a and a horizontal joint part 55b formed at its upper end, and when the holder 44 is moved to the left together with the movable plate 40 as described above. As shown in FIG. 3, the engaging protrusion 54a of the engaging plate 54 engages with the restraining part 55a of the restraining plate 56,
The holder 44 is held in the use position so that it cannot move leftward, and the restraint plate 55 is inserted into the engagement hole 54b of the engagement plate 54.
The mating portions 55b of the holder 44 are iron-coupled to hold the holder 44 in the use position so that it cannot be moved back and forth.

56 is a support plate fixed to the bottom inner surface of the sewing machine bed 25 by a mounting screw 57 below the movable plate 40;
Reference numeral 8 denotes a presser member rotatably supported on the support plate 56 by a support pin 59, and as shown in FIGS. A hole 58a for playing the support shaft 45 is formed, and a presser portion 58b that engages and disengages from the engagement surface 44c of the holder 44 is formed on the left side of the upper end.
is formed protrudingly, and an operating section 58c is provided on the upper part.
is formed by bending.

60' is an operating body that is attached to the right side of the holder 4 turtle by a stepped screw 61 so that it can be rotated manually, and as shown in FIG. An eccentric cam portion 60a that engages with the operating portion 58c of the presser member 58 is formed, and with the holder 44 moved to the use position shown in FIG. 3, the operating member 60 is moved clockwise in FIG. By the rolling operation, the presser body 58 is rotated in the counterclockwise direction in FIG. A leftward pressing force is applied to the inner support shaft 451 to fix the toe holder 44 and the movable plate 40 in the use position so that they cannot move to the right.

Reference numeral 62 denotes a fixed blade having a substantially L-shaped front face fixed to the front end of the left side of the holder 44. When the holder 44 is moved to the use position as shown in FIG. The blade portion is positioned on the same plane as the upper surface of the throat plate 28, close to the cloth feeding side with respect to the needle hole 28b.

Reference numeral 63 denotes an operating shaft which is rotatably supported on the bearing portion 44b of the holder 44 so as to extend in a direction perpendicular to the cloth feeding direction, and 64 is fixed to the left end of the operating shaft 63 via a mounting plate 65. The movable blade has a blade portion and a guide protrusion 64a formed at its lower end, and is exposed on the upper surface of the sewing machine bed 25 through the entrance 28d of the throat plate 28 when the holder 44 is moved to the use position. As the actuating shaft 63 reciprocates, it cooperates with the fixed blade 62 to cut the edge of the work cloth being transferred in the cloth feeding direction prior to loose oversewing.

66 is a spring washer 67 on the operating shaft 63 and a holder 44;
A pressing spring is inserted between the inner wall surface of the movable blade 64 and the fixed blade 6.
It is designed to be pushed towards 2.

Next, when the holder 44 is moved to the use position shown in FIG. 3, the movable blade 64 is automatically interlocked with the shuttle drive shaft 32 in the movement mechanism of the sewing machine as the sewing machine is operated thereafter. The operating mechanism for reciprocating will be explained.

68 is a swinging arm fixed to the right end of the operating shaft 63 via a mounting boss 68a so as to swing integrally with the movable blade 64; As shown in the figure, a connecting pin 68 with a conical head is located on the left side of the lower end.
b is provided protrudingly.

Reference numeral 69 denotes an operating cam whose side surface is approximately triangular and is fixed on the hook drive shaft 32 behind the swing arm 68, and 70' can be placed in the sewing machine bed 25 by a support shaft 71 extending parallel to the hook drive shaft 32. As shown in FIGS. 2 and 4, the bifurcated arm is engaged with the operating cam 69 and is swung by the operating cam 69 as the hook drive shaft 32 rotates. ing.

Reference numeral 72 denotes an operating arm rotatably and axially movably attached to the upper end of the bifurcated arm 70 by means of a support pin 73, and the holder 44 is attached to the distal end thereof when the holder 44 is moved to the use position. A connecting hole 72a that can compete with the connecting pin 68b on the swing arm 68 is formed.

Reference numeral 74 denotes a spring washer 75 at the tip of the support pin 73 and the operating arm 7.
2, the coil spring is wound around a support pin 73, and both ends of the coil spring are connected to the actuating arm 72 and the fork arm 7, respectively, and the actuating arm 72 is swung along the support pin 73. The actuating arm 72 is moved toward the right side in FIG.
It is urged to rotate counterclockwise in Fig. 4 so as to support the rear surface of the holder.

Therefore, when the holder 44 is moved to the storage position shown in FIG. 6, the actuating arm 72 is moved against the rear surface of the holder 44 against the action of the coil spring 74, as shown in FIGS. 7 and 9. When the locking bar 47 is released from the locking bar 47 and the holder 44 is rotated clockwise from the storage position, as shown in FIG. The actuating arm 72 is rotated counterclockwise by the action of the coil spring 74 and the guide piece 54 of the engagement plate 54
The forehead comes into contact with the lower part of c, and the holder 44
When the moving plate 40 is moved to the left to the use position shown in FIG. 3, the operating arm 72 is relatively moved along the lower surface of the guide piece 54c as shown in FIGS. 3, 4, and 8. At the same time, the coil spring 74 pushes the swinging arm 68 toward the swinging arm 68, and as the sewing machine continues to operate, the operating cam 69 and the two-pronged arm 70 are pushed toward the swing arm 68.
While the operating arm 72 is reciprocated once in the left-right direction in FIG. and a shuttle drive shaft 32 in the movement mechanism of the sewing machine are operatively connected. Next, the movable blade 6 is placed in the use position of the holder 44.
A configuration for removing cloth waste from the cutting area by the fixed blade 62 and the movable blade 64 when the edge green of the work cloth is cut in cooperation with the fixed blade 62 as a result of the reciprocating movement of the blade 4 will be explained. .

Reference numeral 76 denotes an introduction hole for removing cloth waste formed vertically through the front part of the holder 44, and when the holder 44 is placed in the use position as shown in FIGS. 2 to 4, Its upper end opening is located on almost the same plane as the upper surface of the needle plate 28, its lower end opening □ is inserted into the sewing machine bed 25, and one side is connected to the fixed blade 62 through the inclined part 76a.
and a cutting operation section by a movable blade 64.

In this embodiment, a guide wall surface 77 is provided on the front surface of the bearing portion 44b of the holder 44 so as to be located above the upper end entrance of the introduction hole 76 on the cloth feeding side, and The cloth scraps cut at the inclined portion 76a and this guide wall surface 7
7 into the introduction hole 76 smoothly. Reference numeral 78 denotes a through hole that opens to the outside and is formed in the bottom wall of the sewing machine bed 26 below the opening ○ at the lower end of the introduction hole 76, and is used by the holder 44 as shown in FIGS. 3 and 4. When moved to the position, the lower end of the introduction hole 76 almost coincides with the entrance in the vertical direction, and the cloth waste introduced from the cutting operation part into the introduction hole 76 as described above is transferred from the through hole 78 to the sewing machine bed. It is designed to be discharged to the outside of 25.

Further, in this embodiment, as shown by the chain line in FIG. When the holder 44 is moved to the use position shown in FIG. 3, it is in an upright state and prevents fabric scraps falling from the introduction hole 76 to the through hole 78 from entering the sewing machine bed 25, and the holder 44 is in an upright position as shown in FIG. By configuring the sewing machine so that it is in a folded state when moved to the storage position shown in FIG. Become what you can.

The operation of the sewing machine incorporating the fabric edge cutting device configured as described above will now be described.

Now, FIGS. 6, 7, and 9 show the state in which the holder 44 has been moved to the storage position within the sewing machine bed 25, and the opening 28d on the upper surface of the needle plate 28 is closed by the lid 30.

In this state, the locking claw portion 47a of the locking bar 47
Due to the action of the tension spring 49, the locking protrusion 44d of the holder 44
Since the holder 44 is engaged with the coil spring 46, the holder 44 is securely held in the stored position against the action of the coil spring 46. Further, the actuating arm 72 on the bifurcated arm 70 in the actuating mechanism separates from the swinging arm 68 on the actuating shaft 63 side, and comes into contact with the rear surface of the holder 44, as shown in FIGS. 7 and 9, to be in a substantially vertical state. Therefore, the operating shaft 63 of the movable blade 64 is disconnected from the hook driving ball 32 in the movement mechanism of the sewing machine. Therefore, if the sewing machine is operated in this state, there is no risk of the holder 44 rattling within the sewing machine bed 25, and the upper surface of the sewing machine bed 25 can be effectively used to perform normal sewing work with the movable blade 64 stopped. It can be carried out. Next, when performing loose overlock stitching while cutting the prosthesis of the work cloth using the cloth edge cutting device, move the lid body 30, which is in the closed position in FIG. When the gate 28d is opened, the lid 30 opens as shown in FIG.
After the engaging portion 31b of the engaging piece 31 provided on the lower surface of the locking bar 47 once engages with the release projection 47c of the locking bar 47, it climbs over the projection 47c. Even if the holder 44 is rotated clockwise in FIG. 6 against the action of the tension spring 9, the locking protrusion of the holder 44 is also released.

As a result, the holder crane and turtle are rotated clockwise from the storage position shown in FIG. When engaged, the holder is held in a horizontal position exposed from the two fins of the needle plate to the top of the sewing machine.Then, the holder is held in a horizontal position exposed to the top of the sewing machine. The operating arm 2 of the mechanism is rotated counterclockwise from the almost vertical position shown in Figure No. 1 by the action of the coil spring gable, and as shown in Figure No. When the holder turtle and the movable plate turtle are moved to the left from this state, the engaging part turtle a of the Notsumasu Mane Tsuru Zero will be on the left side of the moving plate turtle. Zocchibu Kamekani c
After separating from the right side, the mesh part engages with the tortoise c, and the movable plate tortoise skin is positioned and held in the use position shown in the figure. At this time, the above-mentioned engaging protrusion was fake.The horse official was intruding between the throat plate and the guide plate. The restraining plate provided in the sewing machine bed is used to restrain the thin lotus, the onion and the rice bran base part, and also the vertical direction in the usage position shown in Figure 3. The Oyahan Q is held so that it does not move to the left or in the front-rear direction.
After that, the operation part body 8 provided on the right side of the holder Tsurugame
When the illusion is rotated clockwise as shown in Figure 3, the control unit 6 is rotated counterclockwise as shown in Figure 3 through the operation part of the 8th section of the gutter cam section. ``At the presser body S box b, the mating surface 44c of the holder crab turtle is pressed to the left, and a pressing force to the left is applied to the support koji 4 in the elongated hole 58a. The turtle and the movable plate turtle skin are fixed with an iron so that they do not move to the right in the use position.On the other hand, as the holder mountain turtle moves to the left, the actuating arm 72, which is in the inclined state as shown in the rainbow figure of the holder, moves to the left. The guide piece 8 of the grandchild plywood 54 is relatively moved along the lower surface of the crane c, and as shown in Figures 4 and 5, it is laid out in a horizontal position by the action of the coil 74, and is movable. In the vicinity of the swinging arm S8 hanging from the operating shaft 63 of the Hazuru 4, it is pressed against the swinging arm 6. Therefore, if the sewing machine is operated in this state, the hook drive shaft 32 in the movement mechanism of the sewing machine is pressed against the swinging arm S8. The actuating blinker 2 is swung in the left-right direction of the crane figure via the actuating cam Sg and the bifurcated arm blue 8, which do not even rotate. The pin 8b competes with the connection hole 2a of the operating arm 7 to operatively connect the operating shaft 3 of the movable blade 64 and the hook driving shaft S2.

If you continue to operate the sewing machine in this state, the operating cam will also make a two-pronged movement as the rotary hook drive shaft 8 rotates. Even when the movable blade Usukame moves back and forth, the edges of the work cloth being transferred in the cloth feeding direction are cut by the cooperation of the movable blade Tsurugame and the fixed blade 62, and the sewing machine is cut immediately after the cutting operation part. Loose stitching is carried out by the side ruts of the needle and hook and the sewing machine.Furthermore, the cloth waste generated in the cutting operation section during this sewing work is also washed along the sloping part of the crane and turtle holder and along the guide wall surface. Even though it is smoothly introduced into the introduction hole, the introduction □ is discharged and removed from the lower end of the hole through the through hole of the sewing machine bed ant.

Therefore, no cloth waste remains in the cutting operation section consisting of the fixed momme holder and the movable blade Atsutsuru, making it possible to easily and accurately cut the edges of the cloth and loosely darning. Next, a case will be described in which the fabric edge cutting device is stored inside the sewing machine bed 2 again.

In this case, in almost the reverse order of the operations described above, first operate the operating body 6 at the operating position shown in the groove diagram, and then press the presser foot holder... base and movable plate turtle. Release the mirror stop of the holder crane turtle and the movable plate turtle neck of the tortoise presser, and then move the holder 4 umbrella and the movable plate 48 from the usage position shown in Figure 3 to the storage position shown in Figure 3 to the right. Next, move the holder heat source toward the coil spring 6.
When pressed and rotated downward against the action of the locking bar 4,
The locking claw portion turtle 7a of 7 engages with the locking protrusion 44d of the holder 44, and the holder 44 is reliably locked and held in the storage position shown in FIG. In this state, if the cover body 38 is moved to the left and the opening 2d on the throat plate 28 is closed, the sewing machine is ready for normal sewing. In addition, when the lid body 38 is opened, the engaging piece 31 provided on the lower surface of the lid body 38 is pressed.
The engaging portion 31b of the locking bar 47 is connected to the releasing protrusion 47c of the locking bar 47.
It engages with the bar 4 and gets over it, but its direction of action is locked
7 toward the locking protrusion 44d of the holder 4 crane, there is no fear that the lock of the holder 44 in the storage position will be released. Note that the present invention is not limited to the above-described embodiment. For example, even if the holder 44 is supported in the sewing machine bed 24 by a parallel movement mechanism consisting of at least one pair of links, it can be moved between the use position and the storage position in one operation. The sewing machine may be configured such that only the movable blade 64 is exposed on the upper surface of the sewing machine bed 25 when the holder 44 is moved to the use position, or may be configured such that only the movable blade 64 is exposed on the upper surface of the sewing machine bed 25 when the holder 44 is moved to the storage position. Movable blade 84
The movable blade 64 and the movement mechanism of the sewing machine can be configured so that they remain connected without being separated from the movement mechanism of the sewing machine. 30 is removably attached to the throat plate 2's Sekiguchi 28 ridges, or attached so that it can be rotated to open and close with a hinge, etc. In addition, the holder, support mechanism, lid body, locking means, release means, etc. The operating mechanism, etc. can be arbitrarily changed and configured without departing from the spirit of the present invention.As is clear from the above description, the present invention provides that the holder on which the fixed blade and the movable blade are attached is a supporting mechanism. When the movable blade is placed in the use position, at least the movable blade is exposed through the entrance on the sewing machine bed surface and the edge edge is removed by cooperation with the fixed blade. It is now in a state where it can be cut, and it is possible to easily perform green overlock stitching while cutting the edges of the fabric to be processed.In addition, when it is inconvenient, it can be easily stored in the sewing machine bed, and it can be easily stored on the sewing machine bed surface. It has excellent effects that can be used effectively to efficiently perform normal sewing work.

Further, according to the present invention, when the holder is inconvenient, the locking means holds the holder at the storage position in the sewing machine bed without being able to move freely against the action of the mimicking means, and there is no possibility that the holder will wobble in the sewing machine bed. Normal sewing work can be carried out in a stable state without any problems. Also, when the lid body for closing the sewing machine bed surface is opened during use, the action of the locking means is released by the release means, The holder is moved from the storage position to the use position by means of a spring, and at least the movable blade is automatically exposed above the sewing machine bed surface, making it easy and quick to loosely sew the work cloth without requiring any troublesome preparation operations. It has excellent effects that can be started immediately.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of the main parts of a sewing machine showing the state in which the fabric edge cutting device embodying the present invention is used; Figure 3 is a sectional view taken approximately along line 3-3 in Figure 2, Figure 4 is a sectional view taken approximately along line 4-4 in Figure 3, and Figure 5 is approximately taken approximately along line 4-4 in Figure 3. A cross-sectional view taken along line 5-5; Figure 6 is a vertical cross-sectional view of the sewing machine showing the stored state of the fabric edge cutting device; Figure T is a cross-sectional view taken approximately along line 7-7 in Figure 6 The cross-sectional views shown in FIGS. 8 to 10 are partial perspective views seen from the rear side showing the states of the operating mechanism in the use position, storage position, and rotational intermediate position of the holder.

Sewing machine bed 25, throat plate 28, opening 28d, lid body 38,
Engagement piece 38, hook drive shaft 32, moving plate 40, support shaft 45
, holder 44, coil 'coil' 46, locking bar 47,
Release protrusion 47c, tension spring 49, fixed blade 62, movable blade 6
4 “Swinging arm 68, operating arm 72.

Figure 1 Figure 2 Figure 3 Figure 4 5 boxes Figure 6 Figure 7 Blind climbing map Sea bream 8 Foothills army diagram

Claims (1)

[Claims] 1. The fixed blade 62 is fixed, and the fixed blade 62
a holder 44 on which a movable blade 64 for cutting the workpiece cloth is reciprocatably mounted, and at least the movable blade 64 is exposed through an opening on the sewing machine bed surface to cut the edge of the workpiece cloth. support mechanisms 40 and 45 for movably supporting the holder 44 within the sewing machine bed 25, and a support mechanism 40, 45 for movably supporting the holder 44 within the sewing machine bed 25 so that the movable blade 64 can take a used position and a storage position where the movable blade 64 is located below the sewing machine bed surface; A lid 30 for closing the opening 28d on the sewing machine bed surface when the sewing machine is moved to the storage position, a spring means 46 for biasing the holder 44 from the storage position toward the use position, and a locking means 47 and 49 which are arranged and lock the holder 44 in the storage position against the action of the spring means 46; and the lid body 30.
a release means 31 that engages the locking means 47 and 49 to release the locking of the holder 44 when the lid body 30 is moved to open; It is characterized by comprising actuating mechanisms 68 to 74 for reciprocating movement in conjunction with the mechanism 32, and configured such that at least the movable blade 64 is automatically exposed on the sewing machine bed surface when the lid body 30 is opened. A sewing machine with a built-in fabric edge cutting device. 2. A sewing machine incorporating a fabric edge cutting device according to claim 1, wherein the lid body 30 is movably mounted on the sewing machine bed 25 in order to open and close the opening 28d on the sewing machine bed surface.