JPS6244513B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention has a lockstitch frame equipped with a lockstitch seam forming device, and an overlock stitch frame equipped with an overlock seam forming device. The present invention relates to a compound sewing machine that can selectively perform stitching and overlock stitching.

BACKGROUND ART Several sewing machines having both lockstitch and overlock stitching functions have been proposed in the past. First, in the machine described in Japanese Patent Application Laid-Open No. 53-25148, a lockstitch sewing machine and an overlocking sewing machine are installed side by side on a single rotary table in a manner that they face each other. The sewing machine is constructed so that a driving source can be used, and one of the sewing machines can be selectively used by rotating the rotary table. For this reason, this sewing machine not only cannot be said to have a good appearance, but also the entire device including the rotary table has become large.
Preparation work such as carrying and storing the sewing machine when it is in use and when it is not in use, as well as storage work, becomes cumbersome, and moreover, it requires a large space for use and storage. Therefore, this sewing machine was not suitable for general household use.

Next, the sewing machine described in JP-A-54-16260 performs lockstitching and overlocking stitches,
In order to commonly use a bed section corresponding to the bed section of a conventional lockstitch sewing machine frame, an overlock mechanism is provided near the left side of the pillar section of the sewing machine frame, and a lockstitch needle bar mechanism is provided. The head of the sewing machine can be rotated upward at the rear, and when performing lockstitching, the head is placed in the normal downward position, and when performing overlock stitching, the lockstitch needle bar, presser foot, etc. When used, the head is rotated rearward and upward so that it does not interfere with the transfer of the work cloth. By the way, as is well known in the past, the needle bar mechanism must have an accurate positional relationship and a precise synchronization relationship with the hook mechanism in order to form lockstitch stitches in cooperation with the hook mechanism. need to be activated. However, when such a head rotation mechanism is adopted, there is a risk that the corresponding positional relationship between the lockstitch needle in the head and the hook mechanism in the sewing machine bed will be misaligned, which will interfere with the formation of normal lockstitch stitches. It brings about Furthermore, for ordinary sewing machine users such as housewives, rotating the head requires effort;
It's a tedious task.

Next, the sewing machine described in JP-A-54-76347 has a lock stitch forming device and an overlock stitch forming device installed so that they are located on opposite sides within the same frame. The installation state of the sewing machine body is changed so that the direction of the sewing machine is reversed when performing lockstitching and when performing overlock stitching. In this way, a sewing machine body incorporating both a lockstitch mechanism and an overlocking mechanism becomes extremely heavy, and therefore, changing the installation state of the sewing machine body is troublesome, especially for housewives.
It is extremely troublesome when both lockstitching and overlocking operations are performed alternately.

OBJECT OF THE INVENTION An object of the invention is to eliminate the drawbacks of the prior art as described above. More specifically, switching between lockstitch and overlock stitch can be easily performed by a simple operation on the front side of the sewing machine body, and lockstitch and overlock stitch can be performed efficiently, and when performing lockstitch, To provide a compound sewing machine which exhibits an extremely elegant appearance both when performing overcut stitching and which can be covered with a compact cover when the sewing machine is stored.

In order to achieve the object, in the present invention, a recess that is open to the front and extends in the left-right direction is formed on the front side of the lockstitch frame equipped with the lockstitch seam forming device. Inside, an overlock sewing frame equipped with an overlock stitch forming device is attached so as to be movable in the left and right direction, and the overlock sewing frame is mounted on the lockstitch frame during lockstitching and storage. It is arranged so as to be moved toward the pillar portion side, and moved toward the head side of the lockstitch frame when overlock stitching is performed, and is configured to be selectively held at each of these positions.

Embodiment Hereinafter, one embodiment embodying the present invention will be described based on the drawings.A lockstitch frame 2 having a support plate part 1 constituting the support frame of this sewing machine.
These include a base part 3 supported by the support plate part 1, a pillar part 4 rising upward from the base part 3, and a bracket arm part 5 extending leftward from the upper part of the pillar part 4. The support plate 1 extends leftward from the base 3 and has a top surface so that a space is formed between the head 6 that is continuous with the end of the bracket arm 5 and the top surface of the support plate 1. The head 6 and the left side surface of the bed 7 are located on the same plane. Therefore,
The lockstitch frame 2 has almost the same shape as a normal free-arm portable sewing machine. A side cover 8 constituting a part of the frame 2 is fixed to the right side of the lockstitch frame 2.

Front surface 3a of the base portion 3 and front surface 7 of the bed portion 7
a constitutes a continuous same plane, and the pillar portion 4
The upper front surface 4a of the bracket arm portion 5 and the front surface 5 of the bracket arm portion 5
a constitute the same plane. Step portions 4b and 6b located at the same height are formed on the front sides of the pedestal portion 4 and the head portion 6, and front surfaces 4a and 6a of the upper portion of the pedestal portion 4 and the upper portion of the head portion 6 are formed. is located forward of the lower front surfaces 4c, 6c of the pedestal 4 and head 6, and both lower front surfaces 4c, 6c of the pedestal 4 and head 6 are located on the same plane. It is opened forward by the step portions 4b and 6b, the side cover 8, the front surface 3a of the base portion 3, the lower front surface 4c of the pillar portion 4, the front surface 7a of the bed portion 7, and the upper surface of the support plate portion 1. A recess 9 extending in the left-right direction is defined.

The head 6 includes a needle bar mechanism including a needle bar 11 having a lockstitch needle 10 at its lower end and capable of vertically reciprocating movement, a presser bar 13 having a presser foot 12 at its lower end, and a presser bar 13 capable of vertically moving the presser bar 13. Presser foot lifting lever 1 for
A cloth presser mechanism including 4 is attached. As shown in FIG. 10, a needle plate 18 having a needle hole 15 and an opening 17 through which a feed dog 16 projects is fixed on the work cloth supporting surface of the bed portion 7.
A known shuttle mechanism 19 shown in FIG. 3 is provided in the bed portion 7 below the throat plate 18, and is capable of forming lockstitch stitches in cooperation with the lockstitch needle 10. A needle bar mechanism and hook mechanism 19 including the needle 10
etc. constitute a lockstitch seam forming device.

As shown in FIG. 7, a handwheel 20 is arranged on the upper right side of the pillar section 4. As shown in FIG. or,
The upper parts of the bracket arm part 5 and the pillar part 4 are covered with an opening/closing lid 21 that opens rearward, and by opening the opening/closing lid 21, a stitch pattern selection button (not shown) provided inside the opening/closing lid 21 is covered. ), etc. can be operated.

As shown in FIGS. 6 and 8, the pillar portion 4
Two spool pins 2 are installed on the rear side via a mounting plate 22.
3 are erected. As shown in FIGS. 7 and 8, a thread guide rod 24 having a pair of guide holes 24a at its tip is rotatably supported at its base end on the right side of the pillar section 4, and the thread guide rod 24 has a pair of guide holes 24a at its tip. A position disposed above the arm portion 5 to guide the thread pulled out from the bobbin B on the spool pin 23 in the guide hole 24a, and a lockstitch frame 2
It is designed to be selectively placed in an unused position along the rear surface of the vehicle.

As shown in FIG. 6, a handle 25 that can be raised is provided at the top of the lockstitch frame 2, so that when the lockstitch frame 2 is raised, the compound sewing machine can be carried through the handle 25.

In the recess 9, an overlocking frame 26 is supported on the support plate 1 so as to be movable linearly in the left and right direction, and as shown in FIGS. 4 and the right side overlapped with the lower front surface 4c of the head 6 and the front surface 3a of the base part 3, and the lower front surface 6c of the head 6 and the front surface 7a of the bed part 7 as shown in FIGS. It is adapted to be selectively moved and placed to the left position where it is superimposed.

As shown in FIG. 3, FIG. 4, FIG. 7, and FIG. 8, a linear rail-shaped projection 27 extending from side to side is provided on the upper surface of the support plate portion 1, and a linear rail-like projection 27 extending from side to side is provided at the bottom of the overlocking frame 26. is provided with a pair of rollers 28 that roll on the rail-like projections 27. The rail-like projections 27 and the rollers 28 constitute a guide means for guiding the movement of the overlocking frame 26 in the left-right direction. As shown in FIG. 7, within the overlocking frame 26, a positioning lever 30 rotatably supported by a shaft 31 is rotatably operated by an operating knob 29 on the front side.
When the edge stitching frame 26 is selectively placed in both positions, it is fitted into one of the pair of positioning holes 33 provided on the upper surface of the support plate portion 1 by the biasing force of the spring 32, and the edge stitching frame 26 is fitted into one of the pair of positioning holes 33 provided on the upper surface of the support plate portion 1. The overlock frame 26 can be positioned at each position.

This overlocking frame 26 has a body plate 34,
It is comprised of a bed part 35 which extends to the lower part of the body part 34 and whose upper surface serves as a work cloth support surface, and an overhang part 36 which extends to the upper part of the body part 34 and projects above the bed part 35. Its torso 34
The front surface of the overhang portion 36 and the front surface of the overhang portion 36 constitute substantially the same plane, and are substantially parallel to the front surface 5a of the bracket arm portion 5 of the lockstitch frame 2 and located behind the front surface 5a. There is. As shown in FIG. 2, when the overlocking frame 26 is placed at the right position,
The left side surface of the overhang portion 36 forms the same plane as the left side surface of the pillar portion 4 of the lockstitch frame 2, and the fourth
As shown in the drawings and FIG. 5, the overhang portion 36 and the bed portion 3 are
The left side surface of the lockstitch frame 2 and the left side surface of the head portion 6 and the bed portion 7 of the lockstitch frame 2 are respectively flush with each other. In addition, the frame 26 for oversewing
The bed portion 35 is formed to be at the same height as or slightly higher than the bed portion 7 of the lockstitch frame 2, and when the overlocking frame 26 is positioned on the left side, both the bed portions The work cloth support surfaces on 7, 35 constitute a substantially continuous work surface.

The overhang portion 36 includes a needle bar 38 which is capable of reciprocating up and down and has an overlock sewing needle 37 at its lower end.
and a cloth presser mechanism including a presser foot 40 having a presser foot 39 at its upper end and a presser foot lifting lever 41 for raising and lowering the presser foot 40. Further, as shown in FIGS. 7 and 10, the bed portion 35 is equipped with a feeding mechanism including a known feeding dog 42, a looper mechanism including a looper 43, etc., and a needle hole 44 and an overcast stitch. A throat plate 47 having a forming tongue piece 45 and an opening 46 for the feed dog 42 is fixed. The looper 43 is actuated in a known manner by the swinging of the shaft 48, and is capable of forming an overlock stitch in cooperation with the overlock stitch needle 37, and is connected to the needle bar mechanism, the looper mechanism, and the feed mechanism. The overlock seam forming device is constituted by the above. In this embodiment, the workpiece cloth feed direction line d ₁ for lockstitching is determined by the operation of the feed dog 16 in the lockstitch frame 2, and the edge is determined by the operation of the feed dog 42 in the overlocking frame 26. The work cloth feed direction lines _d2 for overlock stitching are parallel to each other. When the overlock stitching frame 26 is positioned to the left, the overlock stitch forming device is positioned to the left of the lockstitch stitch forming device. The lockstitch needle 10 is configured to be positioned to the right with respect to the feed direction line d ₂ of the workpiece cloth by the operation of the feed dog 42 .

A movable blade 49 is supported on the body part 34 so as to be able to reciprocate up and down, and in cooperation with a fixed blade 50 mounted on the bed part 35, can cut the edge of the work cloth by oversewing. A front cover 51 is provided between the trunk portion 34 and the bed portion 35 for discharging the cut cloth ends downward and for covering the front of the looper 43, and can be opened by operating an operating knob 52. .

A handle 5 for moving and operating the overlocking frame 26 is provided at the top of the overlocking frame 26.
3 is provided. The handle 53 has an 11th
As shown in the figure, from the bobbin B to the thread guide rod 2
A pair of guide grooves 5 for guiding the needle thread Y ₁ and the looper thread Y ₂ for overlock stitching guided through the threads 4 and 4.
4 is formed. As shown in FIG. 7, the distance L between each thread guide hole 24a of the thread guide rod 24 and the corresponding guide groove 54 of the handle 53 is
It is configured so that the overlocking frame 26 is almost the same whether it is located on the right or left side.

Similarly, on the front surface of the body portion 34, there is a thread tensioner for applying tension to the needle thread _Y1 guided from one guide groove 54 on the handle 53 to the overlock sewing needle 37 via a plurality of thread guides 55. 56, an adjustment dial 57 for adjusting the tension applied by the thread tension device 56, and a looper thread guided from the other thread guide groove 54 on the handle 53 to the looper 43 via a plurality of thread guides 55. A thread tension device 58 for applying tension to Y ₂ and the thread tension device 58
An adjustment dial 59 for adjusting tension is provided coaxially with the tension adjustment dial 59 .

On the lower front surface 4c of the pillar section 4, as shown in FIGS. 4 and 12, there is an explanation 60 showing how to open and close the front cover 51 of the overlocking frame 26.
and needle thread Y ₁ and looper thread for oversewing
Explanation 61 regarding tension adjustment of Y ₂ is described,
When the overlocking frame 26 is moved to the left, the description is displayed to the operator.

A translucent cover 6 is attached to the edge of the side cover 8.
2 is rotatably supported around an axis extending in the vertical direction, and has two positions, one in which the front side of the overlocking frame 26 is hidden, which is located on the right side as shown in FIG. It is arranged so that it can be rotated to a position where its front side is opened. cover 6
2, there is an explanation 6 showing how to thread the threads Y ₁ and Y ₂ onto the overlocking needle 37 and the looper 43.
3 is written, and the writing appears to the operator when the cover 62 is rotated to the open position.

Further, in this compound sewing machine, a support plate portion 1 is provided adjacent to the bed portions 7 and 35 of the lockstitch frame 2 and the overlock stitch frame 26.
A single auxiliary table 64 is arranged above. That is, this auxiliary table 64 consists of a long table part 64a and a short table part 64b, and is formed into a substantially L-shape in plan view. When lockstitching is performed with the overlocking frame 26 disposed on the right side as shown in FIG. The auxiliary table 64 is placed on the support plate part 1 so as to be adjacent to the left side of the bed part 7 at the charcoal table part 64b, and the upper surface of the auxiliary table 64 is in contact with the work cloth support surface on the bed part 7 in front and in front. The long table part 64a constitutes a substantially continuous wide work surface for lockstitching on the left side, and the long table part 64a is adjacent to the bed part 35 of the overlocking frame 26 at its right end, and is connected to the work cloth support surface thereof. It has become almost continuous. Further, as shown in FIGS. 5 and 6, when performing overlock stitching with the overlock stitching frame 26 placed on the left side, the auxiliary table 64 uses the long table portion 64a to hold the lockstitch frame 2 and the hem stitch. Overlocking frame 26
It is arranged on the support plate part 1 so as to be adjacent to the left side of the bed parts 7, 35 of the lockstitch frame 2 at the short table part 64b, The upper surface of the table 64 is substantially continuous with the work cloth support surfaces on both bed portions 7 and 37 to the left and rear to form a wide overlock sewing work surface.

A projecting piece 64c is integrally formed at the end of the long table portion 64a of the auxiliary table 64.
4 is placed in the lockstitch position, this protruding piece 6
4c fits into a recess 65 formed on the upper surface of the right end of the lockstitch bed section 7 to position the auxiliary table 64 in the left-right direction, and when the auxiliary table 64 is placed at the overlocking position, the protruding piece 64c The oversewing bed portion 35 continues in front of the work cloth support surface to enlarge the oversewing work surface.

As shown in FIG. 2, a long groove-shaped recess 66 is formed on the bottom of the auxiliary table 64.
4 is placed in the lockstitch position, the recess 66
is fitted into the rail-like protrusion 27 on the support plate portion 1 to position the auxiliary table 64 in the front-rear direction. Further, when the auxiliary table 64 is placed at the oversewing position, the recess 66 of the auxiliary table 64 is fitted into another rail-shaped protrusion 67 formed on the upper surface of the support plate 1, and the auxiliary table 64 is moved from side to side. It is designed for positioning in the direction.

Further, the auxiliary table 64 is box-shaped and divided into a lid 68 that forms a work cloth support surface and a storage box 69 whose upper opening can be opened and closed by attaching and removing the lid 68. The storage box portion 69 is designed to accommodate sewing machine accessories such as a presser foot.

Next, the configuration of the drive mechanism of the lockstitch forming device and the overedge stitch forming device will be explained. As shown in FIGS. 8 and 9, a main shaft 70 of a sewing machine that operates the lockstitch seam forming device is rotatably supported on the upper part of the lockstitch frame 2, and is rotatably attached to the right end of the main shaft 70. A toothed pulley 72 is fixed to the outer periphery of the sleeve 71. This pulley 72
A toothed belt 74 is hung between the lockstitch frame 2 and a drive motor 73 provided at the bottom of the lockstitch frame 2. The handwheel 20 is fixed to the pulley 72, and a drive gear 75 is integrally formed therewith.

A pair of collars 76 and 77 are fixed to the main shaft 70 of the sewing machine on both sides of the sleeve 71, and between the outer periphery of the sleeve 71 and the outer periphery of the collars 76 and 77 are clutch springs 78 and 79 with different winding directions, respectively. It is wrapped. The left clutch spring 79 acts to transmit the rotation of the sleeve 71 to the main shaft 70 via the left collar 77 when the handwheel 20 is rotated in the forward direction (counterclockwise in FIG. 8). However, when the handwheel 20 is manually rotated in the opposite direction of the main shaft 70, the right clutch spring 78
It acts to transmit the rotation of the sleeve 71 to the main shaft 70 via the right collar 76.

A sleeve 80 to which one end of the clutch spring 79 is engaged is fitted onto the outer periphery of the clutch spring 79, and a plurality of protrusions 80a are provided on the outer periphery of the sleeve 80. A stopper 81 is disposed outside the sleeve 80, and engages with the protrusion 80a to prevent rotation of the clutch spring 79 when the overlocking frame 26 is placed in the left position. ing.
Therefore, at this time, the driving connection between the sleeve 71 and the left collar 77 is released, and the pulley 7
The rotation of No. 2 is not transmitted to the main shaft 70 of the sewing machine.

As shown in FIGS. 7 and 8, a rotating shaft 82 is rotatably supported by a bearing 83 so as to extend parallel to the sewing machine main shaft 70, and the driving gear 75 is connected to the right end of the rotating shaft 82 via an intermediate gear 84. A driven gear 85 connected to is fixed. Therefore, in conjunction with the rotation of the drive motor 73, this rotating shaft 82
is constantly rotated. A clutch claw body 86 is rotatably supported by a shaft 87 in a hollow portion at the left end of the rotary shaft 82, and a protrusion 86a thereof can be retracted from a slit 88 provided through the rotary shaft 82. A leaf spring 8 is provided between the clutch claw body 86 and the rotating shaft 82 and biases the protrusion 86a in the direction of protruding from the slit 88.
9 is interposed.

A transmission shaft 90 projecting upward is supported by the overlocking frame 26, and this transmission shaft 90
The overlock stitch forming device and the movable blade 49 are configured to be operated by the rotation of the movable blade 49 . A bevel gear 91 is attached to the upper end of the transmission shaft 90.
is fixed.

The transmission shaft 90 is inserted into a sliding member 93 via a bearing 92, and the sliding member 93 is inserted into a through hole 94 formed on the upper surface of the overlocking frame 26 and into the lockstitching frame 2. It protrudes into the lockstitch frame 2 through a transparent hole 95 extending left and right, and the rotating shaft 82 is connected to the pair of arm portions 93a.
is slidably supported. Therefore, as the overlocking frame 26 moves laterally, the sliding body 93 slides on the rotating shaft 82. Both arms 9
3a, a sleeve 96 is rotatably and slidably supported on the rotating shaft 82, and a bevel gear 97 that meshes with the bevel gear 91 is fixed to the outer periphery of the sleeve 96. An engagement groove 96a is formed in a part of the inner circumference of the sleeve 96. Then, when the overlocking frame 26 is moved to the left, the protrusion 86a of the clutch pawl 86 is fitted into the engagement groove 96a of the sleeve 96, and based on this, the rotation shaft 82
The rotation is transmitted to the sleeve 96, and the transmission shaft 90 is rotated via both bevel gears 91 and 97.
Further, when the overlocking frame 26 is moved to the right, the protrusion 86a of the clutch claw body 86 is disengaged from the engagement groove 96a of the sleeve 96, and the drive between the rotating shaft 82 and the transmission shaft 90 is removed. The link is released.

Next, the operation of the compound sewing machine constructed as described above will be explained. Now, in FIG. 1, the overlocking frame 26 is positioned on the right side and overlapped with the lower front surface 4c of the pillar section 4 of the lockstitch frame 2, the cover 62 is closed, and the auxiliary table 64 is closed. The lockstitching frame 2 is shown in a lockstitching state in which the lockstitch frame 2 is placed on the support plate part 1 so as to be located in front and to the left of the bed part 7. In this state, the auxiliary table 64 forms an extremely wide lockstitch work surface that is continuous with the workpiece cloth support surface of the bed portion 7 of the lockstitch frame 2 in front and to the left of the workpiece cloth support surface, and In front and to the right of the lockstitch needle 10, a work space similar to that of a conventional flat bed type home sewing machine is formed.

In this state, the sliding body 93 is positioned to the right, and the drive connection between the rotating shaft 82 and the transmission shaft 90 of the overlocking frame 26 is cut off, and as shown in FIG. The stopper 81 shown is the sleeve 8.
A driving connection between the sewing machine main shaft 70 and the pulley 72 is established at a distance from the projection 80a of the sewing machine.

Therefore, when the sewing machine is operated by the drive motor 73 in this state, the sewing machine main shaft 70 is rotated.
Ordinary lockstitching can be performed using the wide working surface and working space.

Next, if the auxiliary table 64 on the support plate part 1 is removed from the state shown in FIG. 1 as shown in FIG. 3, the cylindrical bed part 7 of the lockstitch frame 2 is exposed, and It can also be used as a regular free arm sewing machine.

Next, to perform overlock sewing using the overlock sewing frame 26, open the cover 62 as shown in FIG.
After rotating the positioning lever 30 with 9,
Using the handle 53, the overlock sewing frame 26 is moved to the left until the positioning lever 30 is fitted into the left positioning hole 33. As a result, the bed portion 35 of the overlock stitching frame 26 and the bed portion 7 of the lockstitch frame 2 are substantially continuous, and the overlock stitch forming device such as the overlock stitch needle 37 is used to sew the lockstitch. It is located on the front left side of the lockstitch forming device such as the sewing needle 10. Next, as shown in FIG. 5 and FIG. On the left side of both bed parts 7, 35
A work surface is formed that is substantially continuous with the work cloth support surface of the lockstitch frame 2, and a work surface that is continuous with the work cloth support surface of the bed section 7 of the lockstitch frame 2 is formed by the short table portion 64b. Further, the projecting piece 64c forms a continuous work cloth support surface at the front part of the oversewing bed portion 35.

Also, in this state, the sliding body 93 shown in FIG. A driving connection is established between the transmission shaft 90 and the stopper 8 shown in FIG.
1 engages with the protrusion 80a of the sleeve 80, and the driving connection between the pulley 72 and the sewing machine main shaft 70 is cut off.

Therefore, when the pulley 72 is rotated by the drive motor 73 in this state, the main shaft 70 of the sewing machine is not rotated, but the transmission shaft 90 is rotated by the rotation of the rotating shaft 82, and the aforementioned wide overlock sewing work surface is used. You can then overlock the edges. In this case, since the lockstitch needle 10 is located to the right of the workpiece cloth feed direction line by the feed dog 42 of the overlock stitch forming device, the lockstitch needle 10 interferes with the execution of the overlock stitch. It will never become.

In order to move the overlocking frame 26 to the right again to make it possible to perform lockstitching, the overlocking frame 26 and the auxiliary table 64 may be operated in the reverse order.

In this way, in this compound sewing machine, the overlocking frame 26 is installed on the front side of the sewing machine.
Switching between lockstitch and overlock stitch is extremely easy just by moving the needle.
0, 37, the hook mechanism 19, and the looper 43, their respective positional relationships are not disturbed, and normal lock stitches and overcut stitches can be obtained.

In addition, a recess 9 is formed on the front side of the lockstitch frame 2 by effectively utilizing the configuration of the lockstitch frame, and the overlocking frame 26 is disposed within the recess 9. The overlocking frame 26 does not protrude outward, resulting in a good appearance, and the overall size is not increased. Therefore, it is convenient to transport and store. For example, when storing the sewing machine, the sewing machine can be covered with a compact, flat-shaped cover and stored without requiring a large amount of space. Furthermore, when the overlock stitching frame 26 is selectively arranged at the lockstitch position and the overlock stitch position in the recess 9, as is clear from the drawings, the lockstitch frame and the overlock stitching frame are Care has been taken to ensure that the surfaces are as continuous as possible, creating an extremely elegant appearance that gives a clean impression.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified without departing from the spirit of the invention, such as omitting the cover that covers the front surface of the overlocking frame 26 during lockstitching. .

Effects of the Invention As explained above in the embodiments, the present invention provides a lockstitch seam forming device that is released forward by effectively utilizing the shape and configuration of the lockstitch frame on the front side of the lockstitch frame having the lockstitch seam forming device. In addition, a recess extending in the left-right direction is provided, and an over-edge sewing frame having an over-edge seam forming device is mounted in the recess so as to be movable in the left-right direction; The sewing machine is configured to be moved to the pillar side of the lockstitch frame when sewing is performed, moved to the head side of the lockstitch frame when overlocking is performed, and to be selectively held at each of these positions. As a result, it is possible to easily switch between lockstitch and overlock stitch by a simple operation on the front side of the sewing machine, and it provides an extremely elegant appearance both when performing lockstitch and when performing overlock stitch. At the same time, it has the excellent effect of being able to cover and store the entire device with a compact cover or the like.

[Brief explanation of the drawing]

1 to 14 show an embodiment embodying the present invention, in which FIG. 1 is a perspective view of the sewing machine in a lockstitching state, and FIG. 2 is a perspective view of the sewing machine with the cover in FIG. 1 opened. Fig. 3 is a perspective view showing the state in which the auxiliary table in Fig. 1 has been removed, Fig. 4 is a perspective view showing the state in which the overlocking frame has been moved to the left, Fig. 5 6 is a perspective view of the sewing machine in the state of performing overlock stitches, FIG. 6 is an external view of the sewing machine seen from the left in the state of performing overlock stitches, and FIG. 7 is a partially cutaway view of the sewing machine in the state of performing overlock stitches. Front view shown in Figure 8
9 is a partial cross-sectional view showing the clutch mechanism between the pulley and the main shaft of the sewing machine; FIG. 10 is a plan view showing the working surface configured when overlocking is performed; and FIG. 11 is a partially cutaway side view. The figure is a plan view showing the handle of the overlocking frame, FIGS. 12 and 13 are enlarged views of the instructions for using the overlock seam forming device provided on the front surface of the pillar, and FIG. 14 is FIG. 3 is an enlarged view of the instructions for use of the overlock seam forming device provided on the back surface of the cover. Support plate part...1, Lockstitch frame...2, Base part...3, Pillar part...4, Upper front part...4a, Step part...4b, Lower front part...4c, Bracket arm part ...5, Head...6, Upper front...6a,
Step part...6b, lower front part...6c, bed part...
...7, Recessed area...9, Lockstitch needle...10, Overlocking frame...26, Body section...34, Bed section...35, Overhang section...36, Overlocking needle ...37.

Claims (1)

[Scope of Claims] 1. A base part 3, a bed part 7 extending rightward from the base part 3 and having an upper surface as a work cloth support surface, and a pillar part 4 rising upward from the base part 3. and a bracket arm part 5 which extends above the bed part 7 from the upper part of the pillar part 4 and has a head part 6 formed at the end thereof.
and a support plate portion 1 that supports the base portion 3 and extends below the bed portion 7.
, a lockstitch seam forming device 10 including a needle bar mechanism equipped on the lockstitch frame 2 , a body part 34 , and a bed part connected to the lower part of the body part 34 and whose upper surface serves as a work cloth support surface. 35, and an overhang part 36 which extends to the upper part of the body part 34 and extends above the bed part 35, and a needle bar mechanism equipped on the overhang frame 26. It is a compound sewing machine equipped with an overlock stitch forming device 37, etc., which includes an upper front surface 4a, 6a on the front side of the pillar section 4 and a head section 6 of the lockstitch frame 2, and a lower front surface thereof, respectively. Step portion 4 located in front of 4c and 6c
b, 6b, both stepped portions 4b, 6b, both lower front surfaces 4
c, 6c, a recess 9 is defined by the front surface 3a of the base portion 3, the front surface of the bed portion 7, and the upper surface of the support plate portion 1, and extends in the left-right direction in a state that is open to the front; The overedge sewing frame 26
is arranged on the support plate part 1 so as to be movable in the horizontal direction relative to the lockstitch frame 2, and the overlocking frame 26 is mounted on the support plate part 1 so as to be movable in the horizontal direction relative to the lockstitch frame 2. A compound sewing machine characterized in that the sewing machine is configured to be moved toward the pillar portion 4 side, moved toward the head portion 6 side when performing overlock sewing, and selectively held at each of these positions. . 2. The compound sewing machine according to claim 1, wherein the lower front surface 4c of the pillar section 4 and the lower front surface 6c of the head 6 are formed so as to be located on the same plane. 3. The compound sewing machine according to claim 1 or 2, wherein the front surface 3a of the base portion 3 and the front surface of the bed portion 7 form a continuous same plane. 4. When performing lockstitching, the overhanging frame 26 is arranged so that the left side surface of the overhang portion 36 of the overlocking frame 26 is substantially continuous with the left side surface of the pillar portion 4 of the lockstitching frame 2. The compound sewing machine according to any one of claims 1 to 3, wherein: 5. When performing overlock sewing, the overhang sewing frame 26 is arranged so that the left side surface of the overhang part 36 of the overlock sewing frame 26 is substantially continuous with the left side surface of the head 6 of the lockstitch frame 2. A compound sewing machine according to any one of claims 1 to 4. 6. When performing overedge stitching, the overedge stitching frame 26 is positioned so that the left side surface of the bed section 35 of the overedge stitching frame 26 is substantially continuous with the left side surface of the bed section 7 of the lockstitch frame 2. A compound sewing machine according to any one of claims 1 to 5. 7 The bed portion 7 of the lockstitch frame 2 and the bed portion 35 of the overlocking frame 26 are formed at approximately the same height so that their respective work cloth support surfaces are continuous with each other during overlock sewing. A compound sewing machine according to any one of claims 1 to 6. 8 At least the upper front surface of the trunk portion 34 of the overlocking frame 26 and the front surface of the overhang portion 36 are configured to be substantially on the same plane, and the lockstitching frame 2
The upper front surface of the pedestal portion 4 and the front surface of the bracket arm portion 5 are configured to be substantially the same plane, and the two planes are substantially parallel, and the plane of the lockstitch frame 2 is configured to be similar to the overlock stitch frame 26. The compound sewing machine according to any one of claims 1 to 4, which is located in front of the plane of the invention.