JPS633664Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a hem sewing device for folding and sewing the hem of underwear, etc. in a sewing machine.

BACKGROUND OF THE INVENTION As shown in FIGS. 1 and 2, the hem of underwear is usually folded inward and sewn with an overlock seam. This is the so-called hemming stitch.
To perform this hem stitching, as shown in Fig. 3, the right end of the work cloth C is folded twice so that the first and second bent parts A and B are formed, and the right end edge of the work cloth C is D is overlapped on the first folded part A, and in this state, an overlock stitch is performed on the right edge D and the first folded part A. After the sewing is completed, the first folded part is sewn as shown in Fig. 4. Return the bent part A to its original state.

In the case of this hem stitching, it is desirable that the needle falls at the dashed-dotted line position on the workpiece cloth C, but in reality, the needle often falls to the right or left of the dashed-dotted line position. That is, although the needle moves up and down at a fixed position, the work cloth C is often not fed to a predetermined position in a predetermined folded state. If the needle falls to the right of the dashed-dotted line position, stitching will occur because the work cloth C is not present, and
If it falls to the left of the dashed-dotted line position, it will be too tight and the stitches will appear largely on the surface of the work cloth C (top side in Figure 4) when the work cloth C is brought into the state shown in Figure 4. As a result, all of these greatly impair the commercial value of the processed fabric as a sewn product.

Purpose of the invention The purpose of this invention is to provide a hem sewing device for a sewing machine that can solve the above-mentioned problems, reliably prevent unsewn stitches and over-overlocking, and can also smoothly feed the fabric. be.

Structure of the Device In order to achieve the above-mentioned object, this device is located on the cloth feeding side of the work cloth feeding means, with a cloth passing gap separated from the work cloth support surface, and at the first bending portion of the work cloth. A lower guide plate formed with a guide surface extending along the cloth feed direction line passing through the needle passing point to engage with the inner surface and guide the work cloth, and a second fold of the work cloth for the lower guide plate. The cross section U is formed by the upper guide plate located with a gap that can accommodate the curve
A hemming ruler in the shape of a letter is arranged, at least a part of the lower guide plate of the hem ruler is extended to the vicinity of the needle passing point, and the guide surface of the lower guide plate is processed on the lower guide plate. The fabric is located closer to the second bending part of the fabric than the fabric feed line passing through the needle passing point on the fabric feed side than the position where the fabric is subjected to the pressing action by the presser foot, and On the cloth feeding side from the receiving position, at least a portion near the needle passing point is formed so as to be located approximately on the cloth feeding line passing through the needle passing point.

Embodiment Hereinafter, an embodiment embodying this invention will be described based on the drawings from FIG. 5 onwards. In Fig. 5, 1 is a sewing machine frame, 2 is a cloth plate, 3 is a throat plate,
4 is a feed dog; 5 is a needle bar having a sewing machine needle 6 at its lower end; 7 is a presser foot arm having a presser foot 8 pivoted at its lower end; 9
is a wire spring that biases the presser foot 8 in the direction of the presser foot. The workpiece cloth C on the cloth plate 2 and the throat plate 3 is moved along the cloth feed direction line toward the needle passing point of the sewing machine needle 6 by the cooperation of the presser foot 8 and the feed dog 4 that performs the known four-movement feed. is transported in one direction along the line.
Therefore, the upper surface of the cloth plate 2 and throat plate 3 constitutes a workpiece cloth support surface 10, and the feed dog 4
and the presser foot 8 constitute a workpiece cloth feeding means. Further, on the back surface of the presser foot 8, a groove 11 is formed on the cloth feeding direction line and extending from the cloth feeding side to the needle passing point along the cloth feeding direction line.

As shown in FIG. 6, a hemming guide device 21 is attached to the front right side of the sewing machine frame 1. Therefore, the configuration of this hem-pulling guide device 21 will be explained in detail below. A mounting base 23 is fixed to the front right side of the sewing machine frame 1 with screws 22. A device frame 25 is horizontally rotatably supported on the mounting base 23 by step screws 24. rotated between positions. Further, a stopper 26 is attached to the mounting base 23, and an elastic piece 27 is attached to the device frame 25, so that when the device frame 25 is placed in the use position, the device frame 25 is prevented from moving further by the stopper 26. Rotation in one direction of the sewing machine frame is restricted, and the mounting base 23 is inserted into the hole 27a formed in the elastic piece 27.
Upper projections 28 are engaged to resiliently hold device frame 25 in its use position.

On the upper surface of the device frame 25, a release lever 30 which is rotatably biased in one direction by a wire spring 31 is rotatably supported by a step screw 29 at an intermediate portion, and one arm portion 30a of the release lever 30 By operating the release lever 30 and rotating it clockwise in FIG. 6 against the spring force of the wire spring 31,
The other arm 30b of the release lever 30 is attached to the mounting base 23.
As a result, the device frame 25 is rotated to the non-use position side against the spring force of the elastic piece 27 due to the reaction force.

Left and right arms 25a, 25b of the device frame 25
The two holes 41 have support shafts 42 extending in the horizontal direction.
is inserted and supported so as to be movable only in its axial direction. As shown in FIGS. 6 and 8, a screw hole 45 is formed in the base end axis of the support shaft 42, and the screw hole 45 has an adjusting screw 46 having a knob 46a and a flange portion 46b. is screwed in. The flange portion 46b is fitted into a regulating groove 47 formed in the device frame 25, and the adjustment screw 46 is prevented from moving in the axial direction and only rotation is allowed. Therefore, when the adjustment screw 46 is rotated, the support shaft 42 is moved leftward or rightward along its axial direction by the action of the screw.

A bracket 49 is fixed to the support shaft 42 between the arms 25a and 25b of the device frame 25 with a screw 48. A rotary solenoid 51 is fixed to the bracket 49, and a rotating arm 53 is fixed to its output shaft, as shown in FIG.

A guide support 61 is fixed to the tip of the support shaft 42, and a step screw 6 is provided on the left end surface of the guide support 61, as shown in FIG.
2, the hemming auxiliary body 63 is rotatably supported in a horizontal plane.

Further, as shown in FIG. 9, the guide support 61 has an insertion hole 7 formed with a female thread at least at the right end.
7 is penetrated, and inside thereof is a pressing piece 78 facing the right side of the hemming auxiliary body 63, and the pressing piece 78.
A spring 79 that applies a spring force in the direction of the hemming auxiliary body 63, and a screw 80 that is screwed into the female thread to adjust the spring force of the spring 79 are inserted. The hemming auxiliary body 63 is always pressed by the pressing force of the pressing piece 78 due to the spring force of the spring 79.
The stopper portion 63b at the cloth feeding side end of the hemming auxiliary body 63 and the guide support body 6 are rotated in one direction.
By engaging with the left side surface of 1, the hemming auxiliary body 63
is held in the position shown in FIG. 67 is a stopper that prevents the hem-pulling auxiliary body 63 from rotating in the other direction.

As shown in FIGS. 5 and 10, a guide recess 81 with guide walls 82 on both front and rear sides is formed on the upper surface of the guide support 61, and a ruler support 83 is fitted inside the guide recess 81. The regulating members 85 and 86 prevent floating.

Both wall portions 8 formed at the front and rear of the ruler support body 83
A ruler guide shaft 87 is installed and fixed between 3a and 83b in parallel to the cloth feeding direction.
A moving body 88 is supported on 7 so as to be movable back and forth. Further, a guide piece 83c is formed protruding from the left side surface of the ruler support 83. The moving body 88
A skirting ruler 90 is rotatably supported in a vertical plane by a shaft 89 at the left end of the two prongs. The hemming ruler 90 has a base 91 and a base 91.
The guide portion 92 is fixed to the guide portion 92 and has a U-shaped cross section formed by an upper guide plate 93 and a lower guide plate 94. As shown in FIG. 11, a guide tongue piece 94a extending in the cloth feeding direction is integrally formed at the right end of the lower guide plate 94, and a guide surface 94 formed on the right side of the guide tongue piece 94a.
b engages with the inner surface of the first folded portion A of the work cloth C which is bent twice for hemming, and guides the work cloth C. A protrusion 94c that protrudes to the right is formed at the tip of the guide tongue 94a, so that the guide surface 94b is connected to a first guide surface 94d that occupies most of the base end side of the guide tongue 94a. It is divided into a second guide surface 94e located at the tip. Also, the first
As shown in FIG. 2, a gap is formed between the upper guide plate 93 and the lower guide plate 94 to accommodate the second bent portion B of the work cloth C, and both guide plates 93,
A cloth receiver 95 whose left and right position can be adjusted by loosening a screw 95a is disposed between 94, and this cloth receiver 95 engages with the second bent portion B of the work cloth C to bend it. invite.

As shown in FIG. 6, when the hemming ruler 90 is moved along the moving body 88 along the ruler guide shaft 87 toward the cloth feeding side, the base 91 is moved against the upper surface of the guide piece 83a of the ruler support 83. The hem ruler 90 is arranged and held in a substantially horizontal state by engaging with the hem ruler 90, and in this state, the lower guide plate 94 is aligned with the work cloth support surface 10 as shown in FIG. The guide tongue piece 94a of the lower guide plate 94 is arranged with a passage gap in between.
is located on the lower surface side of the presser foot 8, and the presser foot 8
The needle enters into the groove 11 and extends along the fabric feed line to the vicinity of the needle passing point. In this state, the first guide surface 94d of the guide surface 94b is located to the left of the groove 11 of the presser foot 8 and the cloth feed line toward the needle passage point on the cloth feed side thereof, and
The second guide surface 94e is located substantially on the cloth feed line on the cloth feed side of the groove portion 11. In other words, the first guide surface 94d is located closer to the second bent portion B of the workpiece cloth C than the cloth feed line on the cloth feed side than the position where the workpiece cloth C is subjected to the pressing action by the presser foot 8; On the second guide surface 94e, the work cloth C is
The position on the cloth feeding side from the position receiving the pressing action is located almost on the cloth feeding line. Also, the first
As shown in FIG. 7, when the hem ruler 90 is moved toward the cloth feeding side along the ruler guide shaft 87, the base 91 of the hem ruler 90 comes off the upper surface of the guide piece 83c, and as shown in FIG. As shown by the two-dot chain line, upward rotation of the hemming ruler 90 is allowed, and when the hemming ruler 80 is rotated upward in this way, the side surface of the guide piece 83c and the side surface of the base 91 face each other to hem the hem. Movement of the pulling ruler 90 toward the cloth feeding side is prevented.

A bracket 96 is fixed to the support shaft 42 between the device frame 25 and the guide support 61 with screws 97.
6, an interlocking lever 99 is rotatably supported at the intermediate portion by a step screw 98, and a connecting link 100 is provided between one arm 99a of the interlocking lever 99 and the rotating arm 53 of the rotary solenoid 51. is interposed, and the other arm portion 99b
is fitted and connected to a long hole 88a formed in the movable body 88 by a shaft 101. When the rotary solenoid 51 is excited, the rotating arm 53
is rotated clockwise in FIG. 7, and thereby the interlocking lever 99 is rotated counterclockwise as shown in FIG. 10, and the movable body 88 is moved to the cloth feeding side. A coil spring 102 is fitted onto the step screw 98 to bias the interlocking lever 99 clockwise.

Next, the operation of the hemline sewing device configured as described above will be explained. Now, before hemming starts, the rotary solenoid 51 is demagnetized. Therefore, as shown in Figure 6,
Spring 1 on stepped screw 98 acting on interlocking lever 99
Due to the spring force of 02, the interlocking lever 99 is placed in one rotational position, and the movable body 88 having the hemming ruler 90 is placed on the cloth feeding side, and the guide tongue of the lower guide plate 94 of the hemming ruler 90 The piece 94a is located in the groove 11 on the lower surface of the presser foot 8.
In addition, at this time, the second guide surface 9 of the hemming ruler 90
By rotating the adjustment screw 46 to the right or left using the knob 46a in advance so that the hem ruler 4e is located approximately on the cloth feeding direction line, the support shaft 42 is adjusted to move to the right or left, and the hemming ruler 90 is provided. The left and right positions of the guide support 61 are adjusted in advance.

In order to start hemming in this state, first, a forward/backward movement switch (not shown) is operated to close. In this way, the rotary solenoid 51 is energized and the rotating arm 53 is activated by the spring 1 on the stepped screw 98.
It is rotated counterclockwise in FIG. 5 against the force of spring 02. Therefore, as shown in FIG. 10, the connecting link 100 is pulled and the interlocking lever 99 is rotated to the position shown in FIG. The guide tongue piece 9 of the hemming ruler 90 is moved to the inactive position where it abuts against the wall portion 83b on the cloth feeding side of the body 83.
4a moves forward from the position of the groove 11 of the presser foot 8. At the same time, the presser foot 8 is raised from the lower working position to the upper non-working position using a foot pedal (not shown).

When the movable body 88 is placed in the inactive position,
The base 91 of the hem ruler 90 comes off the guide piece 83c of the ruler support 83 and the hem ruler 90 can be rotated upward, so that the hem ruler 90 is moved as shown by the two-dot chain line in FIG. 90 to the upper position, and as shown in FIG. The second bent part B is accommodated between the lower guide plate 94 and the upper guide plate 93, and the outer surface of the second bent part B is aligned with the cloth receiver 95. Note that the cloth receiver 95 is moved and adjusted in advance to an appropriate position according to the required hemming width.

After setting the work cloth C as described above, return the hem ruler 90 to the downward horizontal position.

At this time, since the rotary solenoid 51 has already been demagnetized, the spring 102 on the step screw 98
The interlocking lever 99 is rotated clockwise by the spring force, and the hemming ruler 90 is moved together with the movable body 88 to the operating position where it is regulated by the wall 83a of the ruler support 83. Then, the guide tongue piece 93a of the hem ruler 90 enters into the groove 11 of the presser foot 8.

When the sewing machine starts operating in this state, the feed dog 4 and the presser foot 8 cooperate to move the workpiece cloth C set on the hem ruler 90 as shown in FIG.
is the guide surface 9 of the lower guide plate 94 along the cloth feeding direction line.
4b toward a sewing point by the sewing machine needle 6, and at that sewing point hemming stitches are performed on the right edge D and the first folded portion A of the work cloth using an overlock stitch. Note that when the work cloth C has a stepped portion or the like formed by overlapping, when the stepped portion approaches the left side surface 63a of the hemming auxiliary body 63, the auxiliary body 63 is moved due to the engagement between the stepped portion and the left side surface. It is retracted and rotated against the spring force of the spring 89.

In the case of this hem sewing, the guide tongue piece 94a of the hem drawing ruler 90 extends along the cloth feed line to the vicinity of the needle passing point, so that the work cloth C can be smoothly folded to the needle passing point. Not only can it be fed, but also over-overlocking can be reliably prevented. In other words, when the work cloth C is guided so as to wrap around the guide tongue piece 94a as shown in FIG. It tends to protrude in a curved direction. Therefore, if the cloth is fed in this state,
When the needle 6 falls into the space between the guide surface 94b and the right end top of the first bent part A and the work cloth C is brought into the state shown in FIG. appear.

However, in this hem sewing device,
The guide surface 94b is divided into a first guide surface 94d and a second guide surface 94e, and the first guide surface 94d is placed on the second bending portion B side of the cloth feed line, that is, on the left side. and the second guide surface 94
Since e is positioned almost on the cloth feed line, the workpiece cloth C
Even if the first bent portion A protrudes to the right from the first guide surface 94d at the position of the first guide surface 94d, when it is sent to the position of the second guide surface 94e, as shown in FIG. As shown in FIG.
4e, this first bent portion A is located above the needle passage point. Therefore, the needle 6 falls onto the first bent portion A, and over-overlocking does not occur. In order to obtain the above-mentioned overdarning prevention effect, the guide surface 94b is not divided into two guide surfaces, but is made into a single surface, and the entire guide surface 94b is positioned on the cloth feed line, so that the workpiece cloth C It may be possible to tightly wrap the cloth around the guide tongue piece to prevent the formation of a large space between the guide surface and the second bent part, but in this way, the cloth A large resistance acts against the feeding, making it impossible to feed the cloth smoothly. This hem sewing device can simultaneously prevent over-overlocking and smoothly feed the fabric.

Furthermore, in this hem stitching device, since the first folded part A is guided from the inner side thereof, the leftward movement of the first folded part A is restricted, and the first folded part A is It is possible to prevent the needle from moving to the left above the needle passing point. Therefore, a situation in which the work cloth C is not present on the needle passage point cannot occur, and it is possible to reliably prevent the sewing from coming off due to the absence of the work cloth C. Incidentally, the conventional hem hemming sewing device is provided with a guide surface for the first folded portion A on the side of the hemming auxiliary body 63 in the above embodiment, and the guide surface is provided with a guide surface for the first folded portion A.
Since the first bent part A is configured to engage with the outer surface of the sewing machine to provide guidance, the first bent part A can freely move to the left, causing the sewing to come off.

Note that this invention is not limited to the above embodiment, but as shown in FIG. 15, the first guide surface 94d may be formed to be continuous with the second guide surface 94e with a gentle slope. You can.

Effects of the Device As exemplified above in the examples, this device is located on the cloth feeding side of the work cloth feeding means, with a cloth passing gap apart from the work cloth support surface, and at the first bending portion of the work cloth. a lower guide plate formed with a guide surface extending along the cloth feed direction line passing through the needle passing point in order to engage with the inner surface and guide the work cloth; A hemming ruler having a U-shaped cross section is arranged with an upper guide plate located across a gap capable of accommodating the bent portion, and at least a portion of the lower guide plate of the hem ruler is placed near the needle passing point. and extend the guide surface of the lower guide plate to
The work cloth on the lower guide plate is located on the cloth feeding side of the position where the work cloth is subjected to the pressing action by the presser foot, and is located closer to the second folding portion of the work cloth than the cloth feed line passing through the needle passing point; By forming the fabric so that at least a portion near the needle passing point is located on the fabric feeding line passing through the needle passing point on the fabric feeding side from the position receiving the pressing action of the presser foot,
To reliably prevent unstitching and over-overlocking, and to achieve an excellent effect of obtaining smooth cloth feeding.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of a sewn product with hem stitching, Fig. 2 is a partially enlarged perspective view of the same, Fig. 3 is a sectional view showing the hem sewn state, and Fig. 4 is a hem stitched product. 5 is a cross-sectional view showing a state in which the sewing machine is completed, and FIG. 5 and subsequent figures show an embodiment embodying this invention. FIG. FIG. 6 is a plan view of the hem-pulling guide device, FIG. 7 is a front view of the hem-pulling guide device, and FIG. 8 is a cross-sectional view showing a configuration for adjusting the left-right position of the support shaft.
Figure 9 is a bottom view showing the part of the hemming auxiliary body;
Figure 0 is a sectional view showing the state in which the hemming ruler has been moved to the cloth feed side, Figure 11 is an enlarged sectional view showing the state in which the work cloth is guided, and Figure 12 is the state in which the work cloth is set on the hem ruler. The sectional views shown in FIGS. 13 and 14 are sectional views showing the hem hemming state, respectively. FIG. 15 is an enlarged sectional view showing another embodiment. Feed dog 4, presser foot 8, hem ruler 90, upper guide plate 93, lower guide plate 94, guide tongue piece 94a,
Guide surface 94b.

Claims (1)

[Claims for Utility Model Registration] A work cloth feeding means including a presser foot 8 and a feed dog 4 for transporting a work cloth C in one direction on a work cloth support surface 10 through a needle passing point; A first section of the work cloth C which is arranged on the cloth feed side of the work cloth feed means 4 and 8, is located across a cloth passing gap from the work cloth support surface 10, and is bent twice for hemming. A lower guide plate 94 is formed with a guide surface 94b extending along the cloth feed direction line passing through the needle passage point in order to engage with the inner surface of the bent portion A and guide the work cloth C; Information board 94
and an upper guide plate 93 located with a gap capable of accommodating the second bent portion B of the work cloth C, and is formed to have a U-shaped cross section.
And the lower guide plate 94 of the hemming ruler 90 is
At least a part thereof extends to the vicinity of the needle passing point, and the guide surface 94b of the lower guide plate 94 is such that the work cloth C on the lower guide plate 94 is
The cloth feed side is located closer to the second bent portion B of the work cloth C than the cloth feed line passing through the needle passing point, and is not subjected to the pressing action by the presser foot 8. A hemming device for a sewing machine, wherein at least a portion near the needle passing point is located on a fabric feeding line passing through the needle passing point on the fabric feeding side rather than the receiving position.