JPS588869B2 - dual-purpose sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dual-purpose sewing machine that can perform two different stitches: general ordinary stitches (stitches other than overlock stitches, such as straight stitches and zigzag stitches) and backstitch overlock stitches. .

Traditionally, when sewing cloth, there are two main types of stitching: regular stitching and overlock stitching.

In order to perform these two sewing methods, it is sufficient to have two sewing machines, but doing so in an ordinary household is difficult due to the space and cost involved. Problems arise with both.

In order to eliminate this problem, it has been devised to equip the machine frame of a sewing machine with a normal sewing mechanism with an overedge stitching mechanism, but in such a configuration, it is necessary to perform overedge stitching. In some cases, the fabric normally gets caught in the sewing mechanism, resulting in a drawback that the work becomes extremely difficult.

Therefore, the present invention has been made to eliminate the above-mentioned drawbacks, and even a single sewing machine can be equipped with two different sewing mechanisms and can sew in two different ways. Another object of the present invention is to provide a dual-purpose sewing machine that can perform sewing work with good workability.

The drawings showing the embodiments of the present application will be described below.

The machine frame, which has a U-shaped front view, consists of a bed 1, a vertical frame 2 that stands up from the bed 1, and an arm frame 11 that extends from the upper end of the vertical frame 2 in parallel with the top surface of the bed 1. .

As shown in the figure, the vertical frame 2 is constructed by dividing into upper and lower halves, and the respective connecting end surfaces 2' and 11' are opposed to each other and are integrally fixed by a plurality of fixing bolts 23.

Furthermore, wide openings are formed in each of the connecting end surfaces 2' and 11', as shown in the figure.

The arm frame 11 is composed of an arm frame body and a head portion 14 connected to the tip of the arm frame body.

The head portion 14 is rotatably attached to the arm frame body.

That is, a bearing 12 is formed at the tip of the arm frame main body, while the head portion 14 has a shaft 15, which is rotatably fitted into the bearing 12, and an annular stopper 1.
5' prevents it from coming off.

Note that 44 is a handle for turning the head portion 14.

In addition, the arm frame body has a threaded rod 2 for fixing the head part 14.
9 and a handle 30 for its operation.

As the turning and setting mechanism, a turret table mechanism (not shown) often used in machine tools may be employed.

Next, the normal sewing mechanism will be explained.

This normal sewing mechanism is carried out by the head section 14 at the free end of the arm frame 11.
The upper mechanism is provided at the top of the bed 1, and the lower mechanism is provided at the free end of the bed 1.These mechanisms are constructed in the same way as a typical well-known sewing machine.

That is, in the upper mechanism, the main shaft 1 for ordinary sewing is attached to the shaft body 15.
3 is inserted.

Further, a needle bar 16 having a needle 16' attached to its lower end is mounted on the head portion 14 so as to be movable up and down.

This needle bar 16 is connected to a cam attached to the main shaft 13 via a connecting rod.

Furthermore, the head portion 14 is provided with a cloth presser rod 18 that can be moved up and down, and a cloth presser rod 18 is attached to the lower end of the rod as shown in FIG.

(The presser foot is not shown in FIG. 1. Furthermore, the head portion 14 is equipped with a balance mechanism 47, and the head portion
A thread tension device 48 is attached to the outer surface of 4.

Next, the lower mechanism includes a hook 49 disposed in the bed 1 below the needle bar 16 of the upper mechanism and other well-known mechanisms.

Note that 54 indicates a needle hole through which the needle 16' is inserted.

Next, 22 is a timing belt used as an interlocking mechanism between the upper mechanism and the lower mechanism, and is stretched around a timing belt pulley 21 fixed to the main shaft 13 and a hook driving shaft connected to the hook 49, as is well known.

As a result, when the main shaft 13 rotates, the needle bar 16 moves up and down as is well known, and in conjunction with this, the hook 49 also rotates, and the needle 1
Cloth stitching is performed using the upper thread threaded through the hook 6' and the lower thread provided in the hook 49.

Next, a description will be given of the overlocking mechanism provided in the pocket of the U-shaped machine frame.

This hem stitch mechanism is also constructed in the same way as the mechanism of a normal hem stitch sewing machine.

That is, the needle bar 5 is inserted through the support frame 3 integrally formed with the vertical barrel frame 2 so as to be vertically movable.

The reference numeral 20 is a hole for allowing the needle bar 5 to move up and down freely.

Further, a table 4 is formed extending from the bed 1 toward the front side, and this table 4 is equipped with a cloth feeder 8' and a lower knife for cutting the cloth.

Reference numeral 51 denotes an upper knife pivotally attached to the vertical trunk frame 2, which cuts the cloth in cooperation with the lower knife.

Furthermore, a bed plate 28 is provided integrally with the bed 1,
This base plate 28 is provided with a looper 9.

Furthermore, this overlocking mechanism has a presser mechanism having a structure clearly shown in FIG.

Next, its configuration will be explained. A bracket 39' is fixed to a shaft 39 pivotally supported by the vertical frame 2, and a holding piece 40 for holding a work presser foot 40' is pivotally attached to a slot 39'' of this bracket 39' with a shaft pin 40''. It has been done.

This pivot position P and the center line C of the presser foot 40' are denoted by the symbol W.
It is shifted by the distance indicated by .

If the presser foot 40' is supported with this structure, the presser foot 40' can be retracted in the direction shown by the arrow when threading the needle for overlocking, making the threading operation easier. Easy to do.

Furthermore, when sewing the cloth with the presser foot 40' returned to the state shown in FIG. It is always held in the position shown in the figure without moving.

Furthermore, this overlocking mechanism has a front panel 43, as shown in FIG.
2.53 is provided as is well known.

Next, as shown in FIG. 2 in the vertical trunk frame 2, an operating mechanism for the overlocking mechanism is disposed at a position close to the opening of the connecting end surface.

That is, a main shaft 10 for oversewing is provided between both side walls of the vertical trunk frame 2.
is suspended horizontally.

Eccentric rods 6, 7.8 are mounted on the main shaft 10, and a crank rod 50 is connected thereto.

The eccentric wheel rod 6 moves the cloth cutting upper knife 51 up and down, the rod 7 drives the base shaft of the looper 9, and the rod 8
actuates the cloth feeder 8', the crank rod 50 moves the needle bar 5 up and down, and furthermore, these members are configured to actuate each member in relation to each other.

Next, a selection mechanism is provided on the side wall of the vertical barrel frame 2.

The normal sewing main shaft 13 and the overcut sewing main shaft 10 are connected to the motor 4, which is a drive device, through this selection mechanism.
It is designed to be linked to 1.

In detail, the main shafts 13.10 each have pulleys 26.10.
25, 24 and 10' are fitted so as to be freely rotatable about the respective shafts 13 and 10.

Note that the pulleys 26, 25, 24 are integrated.

Furthermore, clutch members 31 and 34 are attached to each free end so as to be able to rotate integrally with the respective shafts 13 and 10 and to be movable in the axial direction. This is a key installed on the shaft to enable this.

The respective pulleys 26, 10' and the clutch member 31.
A pair of recesses and protrusions 3 are provided on the mutually opposing surfaces of 34 so that they can be fitted into or unfitted with each other.
2.36 is formed.

Therefore, when the protrusion 32 is fitted into the recess 26', the pulley 26 and the main shaft 13 rotate together, and when the protrusion 36 is fitted into the recess, the pulley 10' and the main shaft 10 are rotated together. Rotate to.

The above-mentioned pulley 26.10' is connected to a pulley 42 attached to the rotating shaft of the motor 41 by a belt 37.38 so that the pulley 26.10' is driven by the motor 41.

When performing normal sewing of cloth using the sewing machine configured as described above, the selection mechanism is operated so that the rotation of the motor 41 is transmitted only to the main shaft 13 for normal sewing.

In addition, the head portion 14 is arranged in a positional relationship as shown in FIG. 1 or 3 with respect to the arm frame body, and the screw rod 29
Fix it with.

If the motor 41 is rotated in this state, the normal stitching mechanism can perform normal sewing work on cloth in exactly the same way as a normal sewing machine.

When performing normal sewing as described above, covering the overlocking mechanism with the cover 45 shown in Fig. 4 prevents the fabric being normally sewn from getting caught in the overlocking mechanism. It can be prevented.

As shown in the figure, a magnet 46 having an N pole and an S pole is attached to this cover 45, and can be easily attached to and detached from the vertical body frame 2 of the sewing machine.

Next, when over-sewing the cloth, the selection mechanism is operated so that the rotation of the motor 41 is transmitted only to the main shaft 10 for over-sewing.

Further, the head portion 14 is fixed with a threaded rod 29 in a positional relationship as shown in FIG. 2 with respect to the arm frame body.

If the motor 41 is rotated in this state, it is possible to perform oversewing work on cloth using the oversewing mechanism in exactly the same way as a normal oversewing sewing machine.

In this case, even if the upper mechanism of the normal sewing mechanism is provided at the tip of the arm frame 11, it is largely set back from the upper surface of the bed 1, as shown in FIG.

Therefore, the upper mechanism does not interfere with the fabric being oversewn.

This makes it easy to perform overlock stitching.

In this case, as shown in FIG. 6, the needles are removed from the needle bar 16 for normal sewing, the presser foot is removed from the presser foot bar 18, and the cover 54 is placed so as to cover the needle bar 16 and the presser foot bar 18. The cover 54 may be attached to the head portion using a set screw 55.

By using such a cover, even if the head part of the arm frame is fixed to the arm frame body as shown in the figure, when the fabric is drawn into the gap G, the fabric will not be used for normal sewing. prevents it from getting caught in the upper mechanism.

As described above, in the present invention, a pair of normal sewing mechanisms are provided at the free ends of the bed 1 and the arm frame 11 in a machine frame formed in a U-shape from the front, while the above-mentioned U-shape Since the machine is equipped with an overlocking mechanism in the pocket of the frame, when sewing fabric, select normal stitching and overlocking stitches according to the sewing location of the fabric, and then select the appropriate stitching method. It has the usefulness of being able to perform sewing work.

Moreover, according to the present invention, when sewing a wide cloth such as a curtain, for example, by attaching the cover 54, it is possible to prevent the cloth from getting caught in the normal sewing mechanism, thereby preventing damage to the cloth. Of course, the gap G between the cover 54 and the bed 1 allows the cloth to pass through, so the wide cloth is left wide open (most of the cloth passes through the gap G into the U-shaped machine). (with the image still protruding largely outside the frame)
It has the feature of being able to overlock the edges of a wide cloth while feeding it from the front side to the opposite side.

This means that if there is no gap like the one mentioned above, the entire width of the wide cloth mentioned above will have to be gathered up in a bundle and passed through the pocket of the U-shaped machine frame, and in this case the cloth will remain overlapped. This method is useful because it solves all of these problems all at once and allows proper oversewing to be performed with good workability, unlike the problems that occur when the sewing is done or when the operation of feeding the cloth is extremely difficult.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application; Fig. 1 is a partially cutaway exploded perspective view, Fig. 2 is a front view of the dual-purpose sewing machine of the present application performing a cross stitch overlock stitch, and Fig. 3 is a normal stitch. Fig. 4 is a diagram showing an example of a cover for covering the front and side surfaces of the overseam mechanism, Fig. 5 is a perspective view of the presser foot mechanism in the overseam mechanism, and Fig. 6 is a sketch showing a state in which a cover is attached to the upper mechanism for normal sewing. 1...Bed, 2...Vertical frame, 11.
... Arm frame, 16 ... Needle bar of normal sewing mechanism, 5 ... Needle bar of overlocking mechanism.

Claims (1)

[Claims] 1. A bed, a vertical frame erected from one end of the bed, and an arm frame that is placed above the bed and lies parallel to the bed, and one end of which is connected to the upper end of the vertical frame. The machine frame has a U-shaped machine frame, and a pair of upper and lower normal sewing mechanisms are disposed at the arm frame and the free end of the bed in the machine frame, and a U-shaped pocket in the machine frame. is provided with an oversewing mechanism, and further has a cover configured to be freely attached to and detached from the free end of the arm frame, and the size of the cover is determined depending on the size of the cover when attached to the free end of the arm frame. The size is large enough to cover the lower surface of the normal sewing mechanism installed at the free end of the cover, and the size is large enough to form a space between the cover and the bed for passing the cloth through. A dual-purpose sewing machine with special features.