JPS6221557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field and Purpose of the Invention The present invention relates to a sewing machine that cuts an edge of fabric through cooperation between a fixed blade and a movable blade, and discharges the cut edge of the fabric through a fabric waste discharge plate. It is something. An object of the present invention is to provide an opening part of the sewing machine bed for allowing cut fabric scraps to be discharged to the front of the sewing machine bed without entering the sewing machine bed, and for allowing the movable blade to protrude outward when the fabric edge is not being cut. The objective is to provide a sewing machine that can completely cover the

Embodiment Hereinafter, an embodiment embodying the present invention will be described based on the drawings. In the drawing, reference numeral 1 indicates a sewing machine frame, and a well-known needle bar (not shown) that can move up and down and swing in the left and right directions is attached to the head of the arm 2, and the lower end of the needle bar Two needles consisting of a needle 3 for forming a lock stitch and a needle 4 for forming an overcast stitch are fixed to the.

Below the arm 2 is a cylindrical sewing machine bed 5.
is located. A throat plate 6 having a substantially round-shaped longitudinal section is fixed from the front of the upper surface to the upper front of the sewing machine bed 5, and the throat plate 6 has a needle hole 7 for the lockstitch needle 3, and a needle hole 7 for the lockstitch needle 3, and a needle hole 7 for the lockstitch needle 3, and Needle hole 8 for sewing needle 4 and tongue piece 9 for forming overcast stitches
and an opening 11 for the feed dog 10 are formed. As shown in FIG. 2, an open portion 12 is formed in the throat plate 6 from the top to the front on the right side of the overlocking direction line passing over the tongue piece 9. 12a and 12b are the open parts 12, respectively.
The upper opening part and the front opening part are shown.

As shown in FIGS. 1 to 6, the needle plate 6 is provided with an opening/closing lid 13 that opens and closes the opening 12 thereof. The opening/closing lid 13 is configured to have a substantially square shape in longitudinal section, including an upper lid part 13a that opens and closes the upper opening part 12a, and a front opening part 13b that opens and closes the front opening part 12b. And this opening/closing lid 1
3 is supported by a support shaft 14 provided inside the lower end of the throat plate 6 at a shaft support 13c formed on both sides of the base end of the front opening 13b, and around a horizontal axis located at the bottom of the front opening 12b. It can be rotated to open and close. A throat plate 6 is attached to the one shaft support 13c.
A stopper 1 that engages with the inner surface of the opening/closing lid 13 to hold the opening/closing lid 13 in the open state shown in FIGS. 2, 5, and 6.
3b is integrally formed. When the opening/closing lid 13 is opened, the front opening section 13b becomes obliquely downward from the lower end of the front opening section 12b, and the upper cover section 13a becomes obliquely upward toward the front of the sewing machine bed 5. Note that a shallow notch 5a is formed in the sewing machine bed 5 to allow the opening/closing lid 13 to rotate to the open position. The front lid part 13b
An elastic locking piece 15 is fixed to the inner surface of one side, and the elastic locking piece 15 is attached to the front opening part 1 of the throat plate 6.
The opening/closing lid 13 is engaged with the inner surface of one side of the opening/closing lid 2b to lock and hold the opening/closing lid 13 in the closed position. Further, at the rear edge of the upper opening part 12a of the throat plate 6, there is provided an opening/closing lid 1 in the closed position.
A receiving portion 16 for receiving 3 is formed protrudingly. Further, the throat plate 6 has a notch 6a located at the base of the tongue piece 9, and a protrusion 6 located near the notch 6a.
b are formed, and the opening/closing lid 13 has protrusions 13f that fit into the notches 6a and protrusions 6b, respectively.
and a recess 13g are formed.

As shown in FIGS. 2 and 4 to 7, a fixed blade 17 is fixed in the sewing machine bed 5 on the left side of the opening 12, and a notch 18 formed in the throat plate 6 is attached to the upper end of the fixed blade 17. A blade portion 17a facing upward and located in substantially the same plane as the upper surface of the throat plate 6 is formed.

As shown in Figures 7 to 9, the sewing machine bed 5
A bearing 19 is fixed to the inner bottom of the shaft, and a support shaft 20 is inserted and supported in a non-rotatable manner in the bearing 19. A prismatic support part 21 is integrally formed at the left end of the support shaft 20, and two through holes 22 and 23 are formed in the support part 21. A guide shaft 24 is inserted and fixed into the left through hole 22. Further, an eccentric shaft 25 is inserted at the upper end into the right through hole 23, and a square piece 26 is fitted into the eccentric portion 25a on the lower side. The support shaft 20 is urged leftward by a spring 27.

A support body 28 is disposed at the tip of the support part 21, and is supported by the guide shaft 24 so as to be movable up and down through guide holes 29 provided above and below. A bifurcated portion 30 is formed at the right end of the support body 28 and is fitted into the square piece 26 . A movable blade 31 is fixed to the upper right side of the support body 28 with a screw 32. The movable blade 31 has an upper end blade portion 31a protruding from the upper open portion 12a and the fixed blade 1.
The support body 2 faces the blade portion 17a of 7 from above.
8 cooperates with the fixed blade 17 to cut the edge of the fabric prior to oversewing. Note that when the movable blade 31 projects upward, its rear end is positioned relative to the notch 6a.

A substantially shovel-shaped cloth waste discharge plate 33 is fixed to the support body 28 by the screws 32 so as to be in close contact with the right side surface of the blade portion 31a of the movable blade 31;
A positioning protrusion 34 formed on the left side surface is fitted into a positioning recess 35 formed on the movable blade 31. The cloth waste discharge plate 33 has an upper end located in the upper opening 12a and a lower end facing the front opening 12b. On the other hand, as shown in FIGS. 4 and 5, the opening/closing lid 13 is
In the open position shown in the figure, the proximal end edge 13e of the front lid portion 13b is located behind the lower end of the cloth waste discharge plate 33. As the support body 28 moves up and down, the cloth waste discharge plate 3
3 moves up and down together with the movable blade 31 to discharge the cut end of the cloth onto the opening/closing lid 13 below.

As shown in FIGS. 8 to 10, an operating shaft 36 is rotatably supported on the sewing machine bed 5, and a portion thereof is provided with an eccentric shaft portion 36a. An operating knob 37 is fixed to the end of the operating shaft 36 on the front surface of the sewing machine bed 5. A swing lever 38 is swingably supported in the middle part of the eccentric shaft part 36a, and a square piece 39 pivotally supported at the tip thereof is slidable in a guide groove 40 formed on the front surface of the support body 28. At the same time, the two-pronged driven portion 38a formed at the base end engages with the outer circumferential cam surface of the eccentric cam 41. The eccentric cam 41 is reciprocated in conjunction with a lower shaft (not shown) of the sewing machine.
By one reciprocating rotation, the swinging lever 38 swings back and forth within a certain range, and the support body 28 moves up and down. Further, as shown in FIGS. 8 and 9, when the eccentric shaft portion 36a is located on the upper side, the entire swing lever 38 is lifted and the support body 28 is positioned within the normal lifting stroke. , as shown in FIG.
6 is rotated approximately 180 degrees and the eccentric shaft portion 36a moves downward, the swing lever 38 is pulled down, the support body 28 is moved downward from the normal lifting stroke, and the cloth waste discharge plate 33 is moved downward from the throat plate 6. It is lowered together with the movable blade 31 so as to be located below the movable blade 31. Furthermore, when the operating shaft 36 is placed in the position shown in FIG. The elevating movement is stopped when the lowermost position outside the elevating stroke is reached. In this way, a suspension mechanism is configured that blocks the vertical movement applied to the support body 28 by the operation shaft 36, the operation knob 37, the swing lever 38, etc., and also lowers the support body 28.

Further, in the closed position, the opening/closing lid 13 comes into contact with the cloth waste discharge plate 33 due to the rise of the support 28, and is released from the closed position against the action of the elastic locking piece 15. .

A swing shaft 43 is supported within the sewing machine bed 5 via a bearing 42, and a looper 43a is provided at the tip thereof. The swing shaft 43 is connected to a crank body 44 that interlocks with the lower shaft of the sewing machine, and swings within a certain range as shown by a solid line and a two-dot chain line in FIG. As shown in the figure, the looper 43a moves between the lower position and the upper and lower positions of the throat plate 6, and the overlock sewing needle 4
The overlock seam is formed in cooperation with the seam. The crank body 44 and the lower shaft of the sewing machine are connected to each other by disengaging the clutch mechanism when the operating shaft 36 is rotated to the position shown in FIG. It is designed to be shut off when it reaches the position indicated by the two-dot chain line shown in FIG. The related structure of this clutch mechanism and the operating shaft is disclosed in a patent application filed by the same applicant.
The details are described in No. 55-15695 (Japanese Patent Publication No. 61-42594), so please refer to that application.

Next, the operation of the sewing machine configured as described above will be explained. Now, in order to overlock the edges, open/close lid 1
3 to the open position, turn the operation knob 3
7, the operating shaft 36 is placed in the position shown in FIGS. 7 and 8. In this way, the support body 28 is located at the lowest end of the normal lifting stroke. Therefore, if the sewing machine is operated in this state, the feed dog 10 and the presser foot (not shown) work together to transport the workpiece cloth, and fix it before sewing with the overlocking needle 4 and the looper 43a. The edge of the cloth is cut by the cooperation of the blade 17 and the movable blade 31. As shown in Figures 5 and 6, the cut cloth scraps are
The cloth waste is discharged downward as it is pushed down by the cloth waste discharge plate 33 which moves up and down. In this case, since the proximal end edge 13e of the opening/closing lid 13 in the open state is located at the rear of the lower end of the cloth waste discharge plate 33, cloth waste does not enter into the sewing machine bed 5, and the sewing machine bed is securely closed. It is ejected forward.

Next, to perform normal sewing using the lockstitch needle 3 and the hook mechanism (not shown) in the sewing machine bed 5,
By using the operation knob 37, the support body 28 is lowered out of the normal lifting stroke, and the movable blade 31 and the cloth waste discharge plate 33 are lowered into the sewing machine bed 5.
After positioning the looper 43a in the sewing machine bed, if the open portion 12 is closed with the opening/closing lid 13, the state shown in FIG. 1 is obtained, and normal sewing can be performed without any trouble. At this time, as the opening/closing lid 13 rotates, the front opening part 12b of the opening part 12 is closed from the front side by the front opening part 13b, and the upper opening part 12a is closed from the upper side by the upper lid part 13a. Since the opening 12 is closed, even if the opening 12 has a complicated shape, the opening 12 can be closed without any gaps. By the way, if the opening/closing lid is of the type that opens and closes by sliding, the opening may not be completely covered if the shape of the opening is complicated or there are irregularities between the opening/closing lid and the needle plate. However, with this sewing machine, there is no such fear.

Further, if the operation knob 37 is operated by mistake when the opening/closing lid 13 is in the closed position, the support body 28 supporting the movable blade 31 and the cloth waste discharge plate 33 will be removed.
is raised. In this case, if the opening/closing lid is of a sliding type, the opening/closing lid will prevent the support from rising, and there is a risk that the opening/closing lid, cloth waste discharge plate, or pause mechanism may be damaged.
In this sewing machine, when the fabric waste discharge plate 33 comes into contact with the lower surface of the opening/closing lid 13 due to the rise of the support 28, the opening/closing lid 13 is released from the closed position against the action of the elastic locking piece 15. , the support body 28 is allowed to rise, and unlike the slide type, there is no risk of damage to the opening/closing lid or the like.

Effects of the Invention As exemplified in the embodiments above, the present invention supports an opening/closing lid that covers an opening of a sewing machine bed so as to be rotatable around a horizontal axis located at the lower part of the front opening. is rotated to the open position,
By configuring the opening/closing lid so that the proximal edge is located behind the cloth waste discharge plate, the opening of the sewing machine bed can be closed without any gaps even if the sewing machine bed has a complicated shape. To surely prevent debris from entering a sewing machine bed, and to exhibit an excellent effect of preventing damage to an opening/closing lid, etc. even if a support body is erroneously raised in a state where the opening/closing lid is closed.

[Brief explanation of the drawing]

The drawings show a sewing machine embodying the present invention; FIG. 1 is a partial perspective view of the sewing machine when the opening section is closed; FIG. 2 is a partial perspective view of the sewing machine bed when the opening section is open; Fig. 3 is an enlarged perspective view of the opening/closing lid, Fig. 4 is a sectional view of the sewing machine bed with the opening section closed, and Figs. 5 and 6 are respectively raising and lowering of the support with the opening section open. A cross-sectional view of the sewing machine bed showing the time,
Fig. 7 is an exploded perspective view showing the internal mechanism of the sewing machine bed, Fig. 8 is a sectional view showing the internal mechanism of the sewing machine bed, and Figs. 9 and 10 show the relationship of the swing lever when the support is lowered and submerged, respectively. FIG. Sewing machine bed…5, throat plate…6, upper open part…1
2a, front opening part...12b, opening/closing lid...13, base end edge...13e, elastic locking piece...15, fixed blade...1
7, Blade part...17a, Support body...28, Movable blade...3
1. Blade portion...31a, cloth waste discharge plate...33, operating shaft...36, operating knob...37, swing lever...38.

Claims (1)

[Claims] 1. A fixed blade 17 which is fixed to the sewing machine bed 5 and whose blade portion 17a is located in substantially the same plane as the upper surface of the throat plate 6.
a support body 28 which is mounted in the sewing machine bed 5 and moves up and down in conjunction with the lower shaft of the sewing machine; and a blade part 31a which is fixed to the support body 28 and protrudes from the upper open part 12a of the sewing machine bed 5 to form the fixed blade. a movable blade 31 that faces the blade portion 17a of 17 from above and cuts the cloth edge in cooperation with the fixed blade 17 by the vertical movement of the support 28; A sewing machine having a stop mechanism 36, 37, 38, etc., which interrupts the movement and lowers the support 28 out of the normal lifting stroke so that the movable blade 31 stops in a state located below the throat plate 6. , the sewing machine is fixed to the support body 28, the upper end part is located in the upper open part 12a of the sewing machine bed 5 in close contact with the blade part 31a of the movable blade 31, and the lower end part faces the front open part 12b of the sewing machine bed 5. When the movable blade 31 is stopped below the throat plate 6 by the action of the cloth waste discharge plate 33 and the stop mechanisms 36, 37, 38, etc., the upper open portion 12a of the sewing machine bed 5
In order to close the front opening part 12b, a sewing machine bed 5 is attached at the base end so as to be rotatable around a horizontal axis located at the lower part of the front opening part 12b.
An opening/closing lid 13 having a substantially square shape in vertical section is attached to the sewing machine, and an elastic locking piece 15 is disposed between the opening/closing lid 13 and the sewing machine bed 5 to lock and hold the opening/closing lid 13 in the closed position. At the same time, when the opening/closing lid 13 is rotated to the open position, the opening/closing lid 13 is moved so that the base end edge 13e of the opening/closing lid 13 is located behind the lower end of the cloth waste discharge plate 33. A sewing machine characterized by the following: 2. The upper end of the cloth waste discharge plate 33 is connected to the movable blade 31 when the pause mechanisms 36, 37, 38, etc. are in operation.
The needle plate 6 also sinks downward, and the stop mechanism 3
6, 37, 38, etc. are released by the manual operation, they are raised together with the movable blade 31, come into contact with the opening/closing lid 13 in the closed position, and close the opening/closing lid 1.
3. The sewing machine according to claim 1, wherein the sewing machine is configured to release the sewing machine from its closed position against the action of the elastic locking piece 15.