JPS6142594B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a sewing machine having a fixed blade fixed to a sewing machine bed and a movable blade that cooperates with the fixed blade to cut the edge of a work cloth. The present invention relates to a cloth waste discharge mechanism for discharging cloth waste.

OBJECT OF THE INVENTION The object of the invention is to smoothly discharge cut fabric scraps to the front of the sewing machine bed without stagnating on the sewing machine bed during the fabric edge cutting operation, and to provide a manual operation for stopping the movable blade when not in use. Therefore, it is an object of the present invention to provide a cloth waste discharge mechanism in which a cloth waste discharge plate is automatically stored in a sewing machine bed, and other sewing operations can be performed smoothly.

Embodiment Hereinafter, an embodiment embodying the present invention will be described based on the drawings. In the drawing, 1 is a sewing machine frame;
A known needle bar (not shown) that can move vertically and horizontally is attached to the head of the arm 2, and a needle 3 for forming a lockstitch and a needle 3 for forming the lockstitch are attached to the lower end of the needle bar (not shown). A twin needle consisting of a needle 3 and a needle 4 for forming an overcast stitch located in front of the right side is fixed.

5 is a cylindrical sewing machine bed disposed below the arm 2; 6 is a throat plate fixed to the front of the upper surface of the sewing machine bed 5; A needle hole 8 located on the front right side of the needle hole 7 and open at the rear for the overlock stitch needle 4, and a tongue piece 9 for forming an overcast stitch adjacent to the right side of the needle hole 8. and an opening 11 for the feed dog 10 are formed. Reference numeral 12 denotes a sliding plate arranged so as to be slidable back and forth behind the throat plate 6, and is used to cooperate with the lockstitch needle 3 to form lockstitch stitches as shown in FIGS. 2 and 3. It is designed to cover the upper side of a horizontal hook 13 provided in the sewing machine bed 5.

Reference numeral 14 denotes an open portion formed on the right side of the overlock stitching direction line passing above the overlock sewing needle hole 8;
It is constructed by cutting out the front portions of the front wall portion 5a and bottom wall portion 5b of the sewing machine bed 5 on the right side of the sewing machine bed.

A cover 15 is slidably attached to the outer surface of the sewing machine bed 5 so as to open and close both the front opening 14a and the upper opening 14b of the opening 14, and its upper surface is the same as the upper surface of the throat plate 6. It is located on a flat surface. Reference numeral 16 denotes a protruding piece integrally formed at the rear left end of the lid 15, which is fitted into the opening of the overlocking needle hole 8 when the opening 14 is closed by the lid 15, as shown in FIG. It's becoming like that.
17 is a notch formed at the lower left side of the lid 15;
18 is a protrusion integrally formed on the lower right side so as to correspond left and right to the notch 17; 19 is a notch 1;
This is a forward bulge formed between the protrusion 7 and the protrusion 18. Furthermore, between the lid 15 and the sewing machine bed 5, there is a holding member (such as a leaf spring) for slidingly guiding the lid 15 so that it does not come off and for holding the lid 15 in the closed position and the open position. (not shown), and a receiving shelf 2 for supporting the edge of the lid 15 is formed at the open side edge of the needle plate 6.

Reference numeral 21 denotes an opening/closing lid rotatably attached to the bed 5 by a shaft 22 at the lower end so as to cover the lower left side of the front opening part 14a of the opening part 14, and as shown in FIG. It can be placed in a position where it stands up along the open surface of the portion 14a and a position where it falls forward from the upright position, and when it stands up, it engages with the inner edge of the notch 17 of the lid body 15 which is in the closed state. and is maintained in that state.

23, as shown in FIGS. 2, 6, and 8, is inserted into a bulge 24 protruding from the inner surface of the front wall 5a of the sewing machine bed 5, and can be adjusted to move in the axial direction with a screw 25. With a fixed fixed axis,
A plate-shaped portion 23a is integrally formed on the right end thereof. Reference numeral 26 denotes a fixed blade fixed to the plate-shaped portion 23a by a screw 27, the upper end of which faces the notch 28 formed on the right edge of the open side of the throat plate 6, and the upper end blade portion 26a of the fixed blade 26 facing the notch 28 formed on the right edge of the open side of the throat plate 6. It is located substantially on the same plane as the upper surface and parallel to the hem stitching direction line.

Next, a mechanism for cutting the edge of the work cloth in cooperation with the fixed blade 26 will be explained.
5 and 7, 29 is a bearing fixed to the inner bottom of the sewing machine bed 5, 30 is a support shaft inserted and supported by the bearing 29 and fixed by a set screw 33, and the right end thereof A locking pin 32 that fits into the forked portion 29a of the base portion of the bearing 29 is inserted and fixed into the hole 31 of the bearing 29 to prevent rotation of the support shaft 30 and to loosen the set screw 33. This allows only movement in the axial direction.

Reference numeral 34 designates a prismatic support portion integrally formed at the left end portion of the support shaft 30, in which two through holes 35 and 36 are formed. 37 is a guide shaft inserted into the left through hole 35 at the middle part and fixed by a set screw 38; 39 is an eccentric shaft inserted into the right through hole 36 at the upper end; Eccentric part 39a
A square piece 40 is rotatably fitted into the eccentric portion 39a. The eccentric shaft 39 is rotatably adjusted so that the position of the square piece 40 is displaced by the action of the eccentric portion 39a, and is fixed by a set screw 41 at an arbitrary position. 42 is the support shaft 3
This is a spring that biases 0 to the left.

43, as shown in FIGS. 5, 7, and 8, is a support body disposed to surround the support portion 34 of the support shaft 30 from above and below, and the guide shaft is attached to both the upper and lower plate portions of the support body 43. A guide hole 44 for inserting the guide shaft 37 is formed, and the guide shaft 37 can be moved diagonally up and down along the guide shaft 37. Reference numeral 45 denotes a bifurcated portion formed at the right end of the bottom plate portion of the support body 43, into which the square piece 40 is slidably fitted. 46 is a guide groove formed on the front side of the support body 43. 47 is a movable blade fixed to the upper end of the right side of the support body 43 by two screws 48, and the fixed blade 26
is in contact with the side from the side. And this movable blade 47
is moved over a certain range shown in FIG. 8 by the vertical movement of the support body 43 along the guide shaft 37, with its upper end protruding upward from the upper opening part 14b of the opening part 14 when the lid body 15 is opened. The cutting blade 47a moves up and down within L, and its blade portion 47a faces the blade portion 26a of the fixed blade 26 from above so that it can cut the edge of the work cloth. Further, as will be described later, when the movable blade 47 is not in use, its upper end is lowered to a position slightly below the lower surface of the throat plate 6, as shown in FIGS. 9 and 18. .

As shown in FIGS. 1, 5, and 7, 49 is a metal cloth waste discharge plate fixed to the right side of the support body 43 together with the movable blade 47 by the screw 48 on the front side. The bottom wall 49 is formed into a shovel shape as a whole so that the surface is substantially U-shaped, and is inclined downward toward the front toward the lower side, with its tip facing the front opening 14a of the opening 14 on the sewing machine bed 5.
a, a pair of side walls 49b and 49c located on both left and right sides of the bottom wall 49a, and an upper wall 49d curved to extend forward from the upper end of the bottom wall 49a facing the cloth feeding direction. The cloth waste discharge plate 49 is arranged on the left side wall 49b so that the portion excluding the lower end is in close contact with the right side surface of the movable blade 47, and the upper end is approximately at the same height as the upper end of the movable blade 47. Fixed. Therefore, this cloth waste discharge plate 49 moves up and down together with the movable blade 47,
When the movable blade 47 protrudes to the upper surface side of the sewing machine bed 5, it protrudes in the same way, and the movable blade 47 touches the throat plate 6.
When you immerse yourself in the bottom side of the , you will be immersed in the same way. Further, the left side wall 49b is cut out almost along the front edge of the movable blade 47, and the side wall 49b
A positioning protrusion 49e that fits into the small hole 47b on the right side of the movable blade 47 is formed in the movable blade 47.

50, as shown in FIGS. 11, 12, and 15, is an internal frame fixed to the internal upper surface of the sewing machine bed 5, and the two needles 3, 4 are mounted on both the front and back sides of the internal frame.
A pair of support walls 5 inclined with respect to the direction of vertical movement of
1 and 52 are integrally formed. 53, as shown in FIGS. 14 and 15, both the supporting walls 51,
The eccentric shaft is rotatably supported between the support walls 51 and 52, and the portion between the supporting walls 51 and 52 is an eccentric shaft portion 53a. 54 is an operating knob fixed to the front end of the eccentric shaft 53 outside the internal frame 50, and as shown in FIG.
The eccentric shaft 5 faces outward through a through hole 55 formed in the
3 can be rotated from the outside.
Therefore, by rotating the operating knob 54, the eccentric shaft portion 53a can be rotationally displaced. Note that a spring washer 56 is interposed between the operating knob 54 and the internal frame 50 to prevent the operating knob 54 from moving inadvertently. The operating knob 54 is covered by the protrusion 18 on the right side of the lid 15 when the lid 15 closes the opening 14 as shown in FIG. Sometimes, it is exposed to the outside from a notch 17 on the left side of the lid 15, and the bulge 19 is designed to prevent interference between the lid 15 and the operation knob 54 when the lid 15 slides. It's getting old.

As shown in FIGS. 11, 14, and 15, 57 is a swing lever that is swingably supported by the eccentric shaft portion 53a of the eccentric shaft 53 at the intermediate portion;
On the left side thereof, a square piece 59 is fitted with a shaft 58 so as to be slidably fitted into the guide groove 46 of the support body 43.
A fork-shaped driven part 5 is attached to the right end.
7a is formed. Therefore, by rotating the eccentric shaft 53 using the operating knob 54, the swinging fulcrum of the swinging lever 57 is vertically displaced.

Reference numeral 60 denotes an operating shaft rotatably supported between the support walls 51 and 52 on the left and right sides of the eccentric shaft 53, and 61 is an operating member fixed to the operating shaft 60, as shown in FIG. An eccentric cam portion 62, a connecting arm 63, and a fan-shaped gear portion 64 are integrally formed in this order from the front side, and the bifurcated driven portion 57a of the swing lever 57 is engaged with the outer periphery of the eccentric cam portion 62. . Therefore, by the rotation of the eccentric cam portion 62 of the operating body 61, the swing lever 57 is swung around the eccentric shaft portion 53a of the eccentric shaft 53, and the swing lever 57 is
The left end square piece 59 and the guide groove 4 of the support body 43
The support body 43 is moved up and down through the fitting portion with 6, and the movable blade 47 is moved up and down.

Further, in this embodiment, the actuating member 61 is configured to be rotated back and forth within a range of about 90 degrees, and when the actuating member 61 reaches one rotation limit as shown in FIG. Blade 47 and cloth waste discharge plate 4
9 is located at the upper limit of movement, and when the other rotation limit is reached as shown in FIG. 16, the movable blade 47 and cloth waste discharge plate 49 are located at the lower limit of movement. In this embodiment, as shown in FIGS. 14 and 16, when the eccentric shaft portion 53a is rotatably arranged in the upper position, the movable blade 47 moves up and down within the lifting range L, and the eccentric shaft 53a moves up and down within the lifting range L. Said 14th
After rotating approximately 180 degrees from the position shown in Figures and Figure 16,
As shown in FIG. 18, when the eccentric shaft portion 53a is disposed at the lower position, the movable blade 47 and the cloth waste discharge plate 49 are lowered to a position slightly lower than the lower surface of the throat plate 6, and It is now possible to pause at

Next, a mechanism for forming an overlock stitch in cooperation with the overseam needle 4 will be explained. 65 shown in FIGS. A bearing 52 is rotatably supported, and 67 is a mounting shaft slidably supported by the bearing 65. A looper 68 for oversewing is fixedly attached to the tip end. Reference numeral 69 denotes a rocking body which is rotatably supported on the support wall 52 on the rear side by a shaft 70, and the right end of the mounting shaft 67 is pivotally connected to the arm portion 69a, and the actuating member body is connected to the rear side. A gear portion 71 that meshes with the gear portion 64 of 61 is integrally formed.

When the gear portion 64 of the operating body 61 reciprocates, the rocking body 69 reciprocates between the lower position shown in FIG. 14 and the upper position shown in FIG.
As a result, the looper 68 is alternately moved up and down the throat plate 6 in synchronization with the vertical movement of the overlocking needle 4, as shown in FIG. It is now possible to form a or,
This looper 68 has the movable blade 47 within a lifting range L.
When located at the lower limit, it is located below the throat plate 6,
It is arranged so that it is located above the throat plate 6 when it is located at the upper limit.

Next, the driving transmission mechanism for reciprocating the operating body 61 in synchronization with the vertical movement of the hands 3 and 4 will be described. Boss portion 52a of support wall 52
A hollow rotary shaft is rotatably supported by the inner frame 50, and the rear end protruding to the outside of the internal frame 50 has a worm that engages with a worm 74 on a lower shaft 73 that interlocks with the main shaft (not shown) of the sewing machine. A wheel 75 is mounted for relative rotation. As shown in FIGS. 12 and 13, reference numeral 76 designates a clutch pawl body which is tiltably supported inside the rotating shaft 72 by a shaft 77 at the intermediate portion, and rotates integrally with the rotating shaft 72. There is. The rear end of the clutch pawl 76 has a position where it engages with an engagement groove 79 formed on the worm wheel 75 through a groove 78 formed on the rotating shaft 72, and a position where the clutch claw 76 is inserted into the rotating shaft 72 from that position. The claw part 7 is movable between the position where it is immersed in the
6a is integrally formed, and the front end includes a rotating shaft 72 and a groove 9 formed in the shaft of a crank body 81 (described later).
A protruding portion 76b that protrudes in the opposite direction to the claw portion 76a through 0 and 91 is integrally formed. 80
is a spring that urges the claw portion 76a in the direction of the engagement groove 79. Therefore, when the claw portion 76a is fitted into the engagement groove 79 of the worm wheel 75, the rotation of the worm wheel 75 is caused by the rotation axis 72.
When the claw portion 76a is disengaged from the engagement groove 79, the worm wheel 75 is connected to the rotation shaft 72.
is rotated regardless of the

Reference numeral 81 denotes a crank body fixed to the front end of the rotating shaft 72. A link 82 is articulated between the tip of the crank arm 81a and the tip of the connecting arm 63 of the operating body 61. The actuating member 61 is rotated back and forth within a range of approximately 90 degrees each time the actuating member 61 rotates once.

Therefore, when the clutch claw body 76 is fitted into the engagement groove 79 of the worm wheel 75, the rotation of the lower shaft 73 is caused by the rotation of the worm wheel 75 and the rotating shaft 7.
2 to the crank body 81, the operating body 61 performs reciprocating rotation, and as described above, the movable blade 47 and cloth waste discharge plate 49 are transmitted to the crank body 81 through the eccentric cam portion 62 and the swing lever 57. moves up and down, and the overlocking looper 68 captures and transfers the thread loop via the gear section 64 of the actuating section 61, the swinging body 69, etc.

Next, a clutch release mechanism for disengaging the clutch between the clutch pawl body 76 and the worm wheel 75 and a restraining mechanism for preventing the movement of the actuating member body 61 will be explained. As shown in Figures 13 and 14,
A support shaft 84 fixed to the rear support wall 52 is a clutch release plate rotatably supported by the support shaft 83, and as the rotary shaft 72 rotates, the actuating member 61 moves to one side of the reciprocating rotation range. When the movable blade 47 and the looper 68 are located at the lower rotation limit, the protruding portion 7 of the clutch claw body 76
6b to prevent rotation of the rotating shaft 72, and the clutch claw 76 is engaged with the protrusion 76b prior to the engagement with the catch 84a, and the clutch pawl 76 is attached to the worm wheel 75. The guide cam surface 84b is integrally provided with a guide cam surface 84b that is tilted so as to be disengaged from the engagement groove 79. Reference numeral 85 denotes a restraint plate rotatably supported by the support shaft 83 on the front surface of the clutch release plate 84, and as shown in FIG. A restraining portion 85a that clamps the protrusion 76b of the clutch pawl 76 and prevents the clutch pawl 76 from reversing.
As shown in FIG. 19, a guide cam surface 85b that engages with the protrusion 76b of the clutch pawl 76 and retracts the restraint plate 85 prior to the prevention thereof is formed integrally with the guide cam surface 85b. and clutch release plate 84
and the restraining plate 85 has extending portions 84 facing each other.
c, 85c are formed, and both extending portions 84c, 85c are formed.
A spring 86 is stretched between 5c.

A connecting rod 87 holds an eccentric ring 88 fixed to the eccentric shaft portion 53a of the eccentric shaft 53 at its left end, and is connected to the clutch release plate 84 at its right end by a pin 89. This pin 89 engages with a stopper 85d formed protrudingly from a part of the restraint plate 85, and the restraint part 85 is moved against the spring 85.
It is designed to be held in a predetermined position by the urging force of 6.

Then, as shown in FIGS. 14 and 16, the eccentric shaft 53 is moved to the swing lever 57 by the operation knob 54.
When the connecting rod 87 is moved to the right by the action of the eccentric ring 88, the clutch release plate 84 and the restraint plate 85 are moved out of the rotational trajectory of the clutch claw body 76. It is now being placed in

Further, as shown in FIG. 18, when the eccentric shaft 53 is rotated by the operation knob 54 so as to lower the swing fulcrum of the swing lever 57, the connection rod 87 is moved to the left by the rotation of the eccentric ring 88. , and the clutch release plate 84 is rotated clockwise via the pin 89, so that the engaging portion 84a thereof is located within the rotation locus of the clutch pawl body 76. Therefore, as the clutch claw body 76 rotates, the protrusion 7
6b is the guide cam surface 84b of the clutch release plate 84
As shown in FIG. 13, the claw portion 76a is disengaged from the engagement groove 79 of the worm wheel 75, and the connection between the worm wheel 75 and the rotating shaft 72 is disengaged, and the protrusion of the worm wheel 75 is released. When the portion 76b engages with the catch portion 84a of the clutch release plate 84, rotation of the clutch claw body 76 is prevented, and the operating body 61 is stopped at the rotational position shown in FIG. 18.

At the same time, due to the rotation of the clutch release plate 84, the restraining plate 85 is pulled by the spring 86 and rotates following the pin 89, and the restraining portion 85a of the restraining plate 85 is released from the clutch. It is located within the rotation locus of the claw body 76. And the 19th
As shown in the figure, the rotating clutch pawl 76 and the cam surface 85b of the restraint plate 85 engage with each other, and the restraint plate 85 retracts and rotates against the biasing force of the spring 86. Due to the urging force of 86, the restraint plate 85 returns to the position shown in FIG.
The protruding portion 76b of the clutch pawl body 76 is held between the clutch pawl body 76 and the rotating shaft 72 to prevent the rotating shaft 72 from reversing.

Next, the operation of the sewing machine configured as described above will be explained. Now, when performing overedge stitching,
As shown in FIG. 1, the lid 15 is slid open and the opening/closing lid 21 is rotated to open the opening portion 14 of the sewing machine bed 5. In this way, the notch 17 of the lid body 15 and the operating knob 54 correspond to each other, and the operating knob 54 is exposed. When the eccentric shaft 53 is rotated using the operating knob 54 in this state, the swing fulcrum of the swing lever 57 is pulled up as shown in FIG. moves up, the movable blade 47 and the cloth waste discharge plate 49 rise, and the blade portion 47a of the movable blade 47 and the upper end of the cloth waste discharge plate 49 protrude to the upper surface side of the throat plate 6, and the eccentric ring 88 Due to the rotation, the connecting rod 87 is moved to the right, and the clutch release plate 84 and the restraint plate 85 are disposed outside the rotation path of the clutch claw body 76.

When the sewing machine is started in this state, the lower shaft 73 shown in FIGS. 12 and 13 is rotated, and the worm 7
The worm wheel 75 is rotated via the worm wheel 4.
At this time, if the clutch claw body 76 is already fitted into the engagement groove 79 of the worm wheel 75 when the operation knob 54 is operated, the rotating shaft 72
rotates immediately and if the clutch pawl 76 is not fitted into the engagement groove 79 of the worm wheel 75, when the engagement groove 79 and the groove 78 of the rotating shaft 72 are aligned, the leaf spring The clutch pawl body 76 fits into the engagement groove 79 due to the biasing force of 80, and the rotation shaft 7
2 is rotated clockwise in FIG.

Therefore, the actuating member 61 is reciprocated via the clutch body 81 and the link 82, and the eccentric cam portion 6
2, the swing lever 57 swings back and forth, the support body 43 moves up and down, and the movable blade 47 and cloth waste discharge plate 49 move up and down on the upper surface side of the throat plate 6. Therefore, the edges of the work cloth are cut and aligned by the cooperative action of the movable blade 47 and the fixed blade 26. As shown in FIGS. 20 and 21, the cloth waste Ca at the cut end of the work cloth C reaches the inside of the discharge plate 49 from the notch of the left side wall 49b of the cloth waste discharge plate 49, and It is guided forward along the bottom wall 49a of 49 and discharged. In this case, the bottom wall 49
a is inclined downwardly toward the front, and its tip faces the front opening 14a of the opening 14 on the sewing machine bed 5, and side walls 49b, 49 are provided on both sides of the bottom wall 49a.
Since c is formed, the cut cloth waste Ca
is reliably guided forward and discharged to the outside of the front of the sewing machine bed 5 through the front opening 14a.

Further, since the cloth waste discharge plate 49 is in close contact with the side surface of the movable blade 47, cloth waste Ca does not fall between the discharge plate 49 and the movable blade 47.
Moreover, no noise is generated between the discharge plate 49 and the movable blade 47, and the cutting operation of the movable blade 47 is not adversely affected. That is, in the case where the discharge plate 49 is fixed in the sewing machine bed and the movable blade 47 moves up and down relative to the discharge plate 49, the cloth waste Ca flows from between the movable blade and the discharge plate into the inside of the sewing machine bed 5. If the movable blade and the discharge plate are brought into close contact with each other to prevent this, the load on the vertical movement of the movable blade 47 will increase, and noise will be generated between the two.

Further, since an upper wall 49d facing forward is formed at the upper part of the cloth waste discharge plate 49, cloth waste can be removed.
Even if Ca stays and accumulates in the discharge plate 49 for some reason, it is pressed down by the downwardly moving upper wall 49d and is quickly discharged.

On the other hand, due to the reciprocating rotation of the actuating member 61, the oscillating body 69 is reciprocated based on the meshing action between its gear portion 64 and the gear portion 71 of the oscillating body 69, and the looper 68 is rotated through the mounting shaft 67 as shown in FIG. As shown, the overlock sewing needle 4 moves up and down in front and back to capture and transfer the thread loop, and overlock stitches are performed on the edge of the fabric cut by the fixed blade 26 and the movable blade 47. .

Then, for the work cloth C to be hemmed in this way, a lockstitch needle 3 is attached to the side of the hemmed seam.
A lock stitch for sewing is formed by the cooperative action of the horizontal hook 13 and the horizontal hook 13.

Next, if you want to stop performing overedge stitching and perform only lockstitch work, first stop the operation of the sewing machine, the lower shaft 73 will stop, and the operating mechanism such as the rotating shaft 72 and the operating body 61 will stop operating the sewing machine. stops, and the movable blade 47 and looper 68 are stopped at arbitrary positions.

Thereafter, when the operating knob 54 is rotated in the opposite direction, the swinging fulcrum of the swinging lever 57 is lowered by the action of the eccentric shaft portion 53a of the eccentric shaft 53.
As the movable blade 47 and cloth waste discharge plate 49 are pulled down, the connecting rod 87 is moved to the left by the action of the eccentric ring 88, and the clutch release plate 84 and restraint plate 85 are rotated clockwise, and their engagement is The stop portion 84a and the restraint portion 85a are arranged within the rotation locus of the clutch pawl body 76.

In this state, when the handwheel is manually operated to rotate the lower shaft 73, the rotation shaft 73 is rotated based on the lower shaft 73.
As the clutch pawl body 76 rotates, the protrusion 76 of the clutch pawl body 76
b engages with the guide cam surface 85b of the restraint plate 85, and the restraint plate 8
5 is rotated, it slides into engagement with the guide cam surface 84b of the clutch release plate 84, and is then latched onto the latching portion 84a. Therefore, the clutch pawl body 76
is rotated to the position shown in FIG.
a is disengaged from the engagement groove 79 of the worm wheel 75, and the driving connection between the worm wheel 75 and the rotating shaft 72 is disengaged, and the clutch pawl body 76 is disengaged from the engaging portion 84a and the restraining portion 85a. It is restrained from rotating in any direction. Therefore, at this stage, the drive connection between the drive shaft of the sewing machine and the operating body 61 is severed.

When the clutch pawl body 76 in the rotating shaft 72 is engaged with the clutch release plate 84 in this way, the actuating member body 6
1 is stopped at a predetermined rotation angle position shown in FIG. At this time, the swinging fulcrum of the swinging lever 57 is lowered, so the movable blade 47 is placed below the lower limit of its lifting range L, and the looper 68 is placed at the lower limit of its lifting stroke.
Therefore, the movable blade 47 and the cloth waste discharge plate 49 are lowered to a position where they do not protrude from the upper surface of the throat plate 6, and the looper 68 is also retracted below the throat plate 6.

In this state, the needles 3 and 4 are located below the throat plate 6, so the handwheel is manually rotated to position the needles 3 and 4 above the throat plate 6. In place of the twin needles consisting of needles 3 and 4, a single needle corresponding to only the needle 3 is installed, and the opening/closing lid 21 is raised and the lid body 15 is slid to the closed position to open the open part of the sewing machine bed 5. Close. As a result, the upper surfaces of the throat plate 6 and the lid body 15 are continuous, and the movable blade 47 and cloth waste discharge plate 49 are stored in the sewing machine bed 5, so that normal lockstitch work can be performed by subsequent operation of the sewing machine. obtain.
In this case, as described above, the connection between the lower shaft 73 and the operating body 61 is disengaged, and the clutch claw body 76 is restrained so that it cannot rotate, so that the lower shaft 73 is Even if it rotates, the rotation is not transmitted to the actuating body 61,
Furthermore, even if vibrations due to the operation of the sewing machine act on the operating body 61, the operating body 61 will not be rotated, and the movable blade 47 and looper 68 will move up and down to move the throat plate 6. Unexpected situations such as collision with the lower surface can be prevented.

Furthermore, in the closed state of this opening part 14,
Since the operating knob 54 is covered by the protrusion 18 on the right side of the lid body 15, the operating knob 54 is prevented from being rotated by mistake, and the movable blade 47 is not raised or the clutch is engaged. movable blade 47
Also, it is possible to reliably prevent the looper 68 from starting to move up and down.

In addition, when changing and adjusting the edge stitching width, loosen the screw 25 and set screw 33 to change the left and right positions of the fixed blade 26, and move the movable blade 47 to follow the fixed blade 26 by the biasing force of the spring 42 to perform cutting. In this case, since the cloth waste discharge plate 49 is fixed to the movable blade 47, no special operation is required to adjust the position of the cloth waste discharge plate 49.

Further, the present invention is not limited to the above-mentioned embodiments, but may be configured so that, for example, the lid 15 is made removable, the support 43, the movable blade 47, and the cloth waste discharge plate 49 move up and down by rotation. However, this does not deviate from the spirit of the invention.

As exemplified in the embodiments above, in the present invention, during the fabric edge cutting operation, the fabric waste discharge plate moves up and down integrally with the support body that supports the movable blade, and discharges the cut fabric waste to the front of the sewing machine bed. When the fabric edge cutting is stopped, the fabric waste discharge plate is stored below the throat plate together with the movable blade, and is covered from above by the lid, so that fabric waste is not removed from the sewing machine bed during the fabric edge cutting operation. It is smoothly discharged to the front of the sewing machine bed without falling or accumulating, and when the movable blade and cloth waste discharge plate are not in use,
It exhibits an excellent effect that allows other sewing operations that do not require it to be carried out smoothly.

[Brief explanation of the drawing]

The drawings show a sewing machine embodying the present invention, and FIG. 1 is a partial perspective view showing the sewing machine bed when the opening part is opened, with the internal mechanism omitted;
Fig. 2 is a partially cutaway plan view of the sewing machine bed when the opening section is closed, Fig. 3 is a partial plan view of the sewing machine bed when the opening section is open, and Fig. 4 is a partial front view of the sewing machine bed when the opening section is closed. Fifth
The figures are a sectional view taken along the line 5-5 in Fig. 3 during overlock sewing, Fig. 6 is an exploded perspective view showing the support mechanism for the fixed blade, Fig. 7 is an exploded perspective view showing the support mechanism for the movable blade, and Fig. 8 is an exploded perspective view showing the support mechanism for the movable blade. The figure is a sectional view taken along the line 8-8 in Fig. 5, Fig. 9 is a sectional view taken along the line 9-9 in Fig. 5, showing the movable blade at rest, and Fig. 10 is a sectional view taken along the line 10-10 in Fig. 5.
11 is a sectional view taken along line 11-11 in FIG. 4, FIG. 12 is a sectional view taken along line 12-12 in FIG. 14, and FIG. 13 is a sectional view of the main part of FIG. Fig. 14 is a partially cutaway front view showing the operating mechanism of the looper and movable blade, Fig. 15 is a plan sectional view showing the operating mechanism of the looper and movable blade, and Fig. 16 is the operation of the operating mechanism of the movable blade. Fig. 17 is a partially cutaway front view showing the operating state of the looper; Fig. 18 is a partially cutaway front view showing the operating state of the looper operating mechanism;
The figure is a partially cutaway front view of the operating mechanism when the looper and movable blade are at rest, Figure 19 is a partially cutaway front view of the operating mechanism before the clutch claw body and clutch release plate are engaged, and Figure 20 is a movable part. FIG. 21 is a cross-sectional view showing the action of the cloth waste discharge plate when the blade is at the upper limit of the lifting range, and FIG. 21 is a cross-sectional view showing the action of the cloth waste discharge plate immediately after the cutting operation of the movable blade. Sewing machine bed 5, throat plate 6, lid body 15, fixed blade 2
6, blade part 26a, support body 43, guide hole 44, movable blade 47, blade part 47a, cloth waste discharge plate 49, eccentric shaft 53, operation knob 54, swing lever 57, operating body 61, rotating shaft 72, Lower shaft 73, crank body 8
1.

Claims (1)

[Scope of Claims] 1. A fixed blade 2 that is fixed to the sewing machine bed 5 and whose blade portion 26a is located in substantially the same plane as the upper surface of the throat plate 6.
6, a support 43 mounted in the sewing machine bed 5 so as to be movable up and down, and a blade 47a fixed to the support 43 that protrudes from the upper open part 14b of the sewing machine bed 5 and connects to the blade 26a of the fixed blade 26. The sewing machine has a movable blade 47 facing from above, and the movable blade 47 cooperates with the fixed blade 26 to cut the edge of the fabric as the support body 43 moves up and down. Actuating mechanisms 57, 61, and
72, 81, etc., and their operating mechanisms 57, 61, 72, 81, etc., and are arranged in association with the operating mechanisms 57, 61, 72, 81, etc., and block the vertical movement applied to the support body 43 by manual operation, and the movable blade 47 a stop mechanism 43, 53, 54, 57 that lowers the support 43 out of the normal lifting stroke so that it is stopped in a state located below 6;
When the movable blade 47 is stopped below the throat plate 6 by the action of the stop mechanisms 43, 53, 54, 57, etc., at least the sewing machine bed 5
Lid body 15 for closing the upper opening part 14b
and a fabric waste discharge plate 49 fixed to the support body 43, whose upper end protrudes from the upper surface of the sewing machine bed 5 in close contact with the blade portion 47a of the movable blade 47, and whose lower end faces the front opening 14a of the sewing machine bed 5. When the fabric edge cutting is in operation, the fabric waste discharge plate 49 moves up and down integrally with the support body 43 to discharge the cut fabric waste to the front of the sewing machine bed 5, and when the fabric edge cutting is stopped, the fabric waste is discharged. The discharge plate 49 is the movable blade 4
7 and is stored below the throat plate 6, and the lid body 1
5. A cloth waste discharge mechanism characterized in that it is covered from above. 2 The cloth waste discharge plate 49 has a substantially U-shaped cross section, and the movable blade 47 is formed on one side wall of the cloth waste discharge plate 49.
A fabric waste discharge mechanism in a sewing machine according to claim 1, wherein the fabric waste discharge mechanism is fixed to a support body 43. 3 The cloth waste discharge plate 49 is curved so that the upper end in the longitudinal cross-sectional shape extends forward facing the cloth feeding direction, and is configured to press down the cut cloth waste from above in its downward stroke. A cloth waste discharge mechanism in a sewing machine according to claim 1 or 2. 4. The operating mechanism includes a swinging lever 57 that is operatively connected to the support 43 and swings about a horizontal axis, and the resting mechanism lowers the swinging fulcrum of the swinging lever 57. A cloth waste discharge mechanism in a sewing machine according to claim 1, further comprising an operation member 54 for causing the cloth waste to be discharged. 5. The lid body 15 is slidably attached to the sewing machine bed 5, and both the upper opening part 14b and the front opening part 14a of the sewing machine bed 5 are releasably closed. Cloth waste ejection mechanism in the sewing machine described.