JP2547657Y2 - Top feed device for overlock sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a skid, a jogging wear or a raincoat for promoting sweating, for example, a cloth in which a rubber material or the like is coated on the back of a cloth taffeta (plain woven) with nylon yarn. The present invention relates to an overfeed device for an overlock stitch sewing machine used for transferring a cloth when sewing or the like.

[0002]

2. Description of the Related Art Conventionally, as this kind of general technology, for example,
For example , as disclosed in Japanese Patent Publication No. 57-26795, a lower feed dog provided on the lower surface of a cloth so as to make a quadrilateral movement by a combined movement of a horizontal feed element and a vertical feed element interlocking with a main shaft of a sewing machine; An upper feed device has been proposed in which an upper feed tooth is provided on the upper feed arm, which is rotatably connected to a member that reciprocates in the horizontal direction in conjunction with the horizontal feed element and has an upper feed tooth that is opposed to the upper side of the lower feed tooth at the tip. (Hereinafter, referred to as a first conventional technique).

[0003] As another conventional general technology, for example,
JP is Utility Model 59-8685 and Japanese Utility Model 60-1252
No. 4, etc. as disclosed in Japanese, the first conventional
Complement <br/> auxiliary feeding apparatus employing an endless belt instead of the upper feed dog has been proposed in the art (hereinafter, referred to as second prior art).

[0004] Apart from such conventional general techniques ,
Example, if as disclosed in Japanese Patent Utility Model 56-50849, perpendicular to the main feed dog and auxiliary feed dog in the cloth feeding direction
Arranged side by side in a direction, these main, the fabric by auxiliary both feed dog
One that is transported in a predetermined cloth feed direction (hereinafter, referred to as
As disclosed in the third prior art) and Japanese Utility Model Publication No. 51-4855, a front feed dog and a rear feed dog are formed with a cloth.
Arranged before and after in the feed direction, and the cloth
Set the feed amount larger than the cloth feed amount by the front feed dog ,
When transfer fabric to the predetermined cloth feeding direction on both the feed dog back and forth, sewing while stretching the fabric by the difference in the cloth feed amount
Proposal of what was made possible (hereinafter referred to as the fourth prior art)
Have been.

[0005]

Among the above-mentioned prior arts, in the first prior art, a rubber material or the like coated on the back surface of the fabric to be sewn, that is, the back surface of the taffeta fabric, is subjected to a second overlocking sewing. Ri Do and-folded in surface, since the coating surface, such as rubber <br/> beam member becomes Rukoto pressed
In addition, the frictional resistance is extremely high , which makes it difficult to transfer the cloth smoothly in the cloth feeding direction, and causes a problem that sewing wrinkles (hereinafter referred to as puckering) occur.

In addition, the shape of the tooth surface of the upper feed dog and the lower feed dog is
If it is formed in a vertical symmetric shape, the upper feed dog and lower feed dog
If the mounting of the teeth is slightly shifted in the longitudinal direction,
If there is a slight difference in the amount of cloth
Because the peak of one tooth goes into the valley of the other tooth
Bite the fabric between the teeth and damage the fabric.
There is also.

[0007] its in this, Do not puckering described above occurs
The odd, in order to also smooth the transfer of the fabric, the worker but it is conceivable that while seeking sewing pull the fabric to the cloth feeding direction in a state in which the tension of the fabric by hand, in this case, since the operator individual there is a variation in the tensile force on the fabric, the seam lack uniformity, resulting in a problem that leads to quality low under the garment.

Further, the second prior art, not only has wear endless belt, must be accommodated a drive mechanism or the like for driving the endless belt, the sewing machine to size
Rutotomoni, only sewing machine cost bulk, further, the rubber material or the like
Reliable and smooth feeding of coated fabric
There is a problem that it is difficult to transfer in the direction .

On the other hand, in the case of the third prior art, the main feed dog arranged in a direction perpendicular to the cloth feed direction is provided.
Auxiliary feed dogs are located on the upper and lower sides of the folded fabric.
Each of them comes into contact with each other to exert the feed action,
It is possible to prevent a delay in the side land
However, since the fabric press area by the presser foot is large,
The back side is coated with a rubber material to reduce frictional resistance.
Wamete for high fabric, the first prior art and that above mentioned
In almost the same way, transfer
Can not avoid the occurrence of puckering
There is a problem that it is not. Also, according to the fourth prior art,
If the cloth feed amount is different between the front and rear feed dogs,
Tension can prevent puckering
However, it is almost the same as the third prior art described above.
The press area of the fabric by the presser foot is large and
Rubber material on the back side due to the small fabric contact area due to the teeth
Coated with high friction resistance
Is a predetermined cloth feeder, substantially in the same manner as the first prior art described above.
Cannot be transported smoothly in the
There is a problem that it is not possible to avoid occurrence of bugs.

This invention has been made in view of the above-mentioned problems of the prior art. In the case where a taffeta (plain woven) fabric is coated with a rubber material or the like on the back surface, and a fabric having high frictional resistance is to be sewn, But the fabric presser with the fabric presser foot
Fabric in a certain direction while ensuring the stability of
And to provide an upper feed device overlock stitch sewing machine capable of preventing smooth by transfer to ensure the generation of Pakkarin grayed.

[0011]

To achieve the above object, according to the solution to ## feeding on the overlock stitch sewing machine according to the invention apparatus, the cloth presser foot for pressing the fabric on surface of the needle plate, the fabric press
It is located in the first half of the cloth feed direction at the top of the
Move the fabric in the fabric feed direction by moving while in contact with the surface.
A front upper feed dog having a tooth surface to be fed, and an upper part of the pressure foot
To the upper part of the fabric
Movement synchronized with the front upper feed dog in contact with
The edge with the upper feed dog after transferring the ground in the fabric feed direction
An upper feed device for a re-stitching sewing machine , wherein
Presser hinge at approximately the middle of the front-back length along the cloth feed direction
And the cloth feed
Part of the presser part in the latter half of the direction corresponding to the edge of the fabric
While the rear upper feed dog has a tooth surface that is located in the cloth feed direction in the pressure foot.
And extension building portion to the proximal contact position enters the cut portion formed in a semi-cloth presser claw of the cloth presser foot, the fabric presser foot
Is located immediately after
Of the presser foot in the latter half of the cloth feed direction
Substantially L-shaped in plan view having a portion extending to near the side edge
It is formed in you characterized.

[0012] In addition, on top of the overlock stitch sewing machine of the above-described configuration
In the feed device, it is preferable that the tooth surfaces of the front upper feed dog and the rear upper feed dog are formed in a diamond cut shape.

[0013]

According to this invention , the presser foot is formed as a presser foot.
Pressing part in the second half of the cloth feed direction from the connection point to the hinge
Cut out the part corresponding to the edge of the fabric,
The above-mentioned presser foot can be
To the presser hinge at approximately the middle of the front and back along the
This improves the stability of the fabric presser action due to the presser foot.
It can be secured well. Also, set the cloth foot
As described above, by making the fabric pressing area small, the tooth surface of the rear upper feed dog is moved in the latter half of the fabric press direction in the fabric feed direction.
Into the cutout formed in the
To the position close to the pawl and
Immediately after the feeder, even in the direction perpendicular to the
Near the inner edge of the presser foot in the second half of the presser foot in the feed direction
To form an approximately L-shape in plan view.
The contact area of the rear upper feed dog with the fabric
Can be increased. Thus, the fabric presser
Pressing the fabric with the presser foot while ensuring stable operation
By reducing the area as much as possible and by using the upper feed dog
Synergy with maximizing the fabric contact area as much as possible
By sewing rubber fabric etc. on the back of taffeta (plain woven) fabric, the fabric with high friction resistance is sewn
The fabric in cooperation with the upper and lower feed dogs .
Can be transported smoothly in a predetermined direction .
First, puckering can be reliably prevented.
You.

In particular, the tooth surfaces of the front upper feed dog and the rear upper feed dog
ToDiamond cut as claimed in claim 2Formed into a shapePass
IfThe peak of the tooth surface of the upper and lower feed dogs at the valley of the tooth surface of the lower feed dog
Department does not enter,Press the fabricTransportWhen
Can be prevented from being damaged.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view of the upper feed device of the overlock sewing machine according to the present invention. The upper feed device is disposed on the front upper feed dog 1 and on the fabric feed direction side of the front upper feed dog 1. A rear upper feed dog 2 and a screw 3
The front upper feed dog 1 is screwed near the base of the front upper feed dog 1 via a screw 4 and the front upper feed dog 1 is
Is screwed to the upper feed stand 9 shown in FIG.

A needle bar bush 6 is press-fitted into the sewing machine frame 5 shown in FIG. 1, and a needle bar 7 is loosely fitted in an inner hole (not shown) provided in the bush 6 so as to freely reciprocate up and down. The needle bar 7 is inserted at the lower end of the needle bar 7 (not shown).
The sewing machine needle 8 is fixed via the. The needle bar 7 is vertically moved by the operation of a well-known needle bar mechanism using the inner hole of the needle bar bush 6 as a guide.

In FIG. 1, reference numeral 10 denotes an upper surface 15 of the needle plate 15.
a with a fabric presser that presses the fabric against the
At a substantially intermediate portion of the front-rear length, the holding hinge pin 11 is connected to the holding hinge 12 via a holding hinge pin 11.
Presser part in the latter half of the fabric feeding direction from the connection point by G12
Of the 10A, the part corresponding to the edge of the fabric is cut off
(See FIG. 3). The upright portion 12a of the presser hinge 12 is formed through each have parallel inner bore to the fabric feed direction, the protruding shaft 13 of the presser arm 13 in its inner hole
a is inserted and the screw 14
The bottom surface 10a is positioned adjustably screwed so as to contact the upper surface 15a of the needle plate 15.

Reference numeral 16 denotes a presser bar which is inserted into and held by the side cover 17 of the sewing machine frame 5, and has a bifurcated portion formed at the lower end thereof. . The bifurcated portion of the presser bar 16 regulates the position of the needle drop portion 19 of the presser foot 10 shown in FIG. Since the configuration described so far is a known configuration,
Detailed description is omitted.

FIG. 2 is an exploded perspective view of the main part of the upper feed device. The upright portion 2a of the rear upper feed tooth 2 is inserted into a U-shaped groove 1a formed near the base of the front upper feed tooth 1. The rear upper feed dog 2 is screwed to the front upper feed dog 1 by passing the screw 3 through an oval long hole 2b provided in the upright portion 2a. A feed tooth surface 1b at the tip of the front upper feed dog 1;
The positional relationship between the lower end of the rear upper feed dog 2 and the feed tooth surface 2c is shown in the figure.
Usually, it is mounted so that the tooth surface 2c of the rear upper feed dog 2 is flush with the tooth surface 1b of the front upper feed dog 1 based on the state of contact with the tooth surface 1b. However, depending on the sewing fabric or sewing conditions, the above-mentioned tooth surfaces 1b, 2c
May be attached with uneven steps. In addition,
The front upper feed dog 1c is attached to the upper feed base 9 with the screw 4 like the oval long hole 2b provided in the rear upper feed dog 2.

FIG. 3 is a schematic plan view of the upper feed device used at the time of overlock sewing, and FIG. 4 is a schematic plan view of the upper feed device used at the time of interlock sewing.
As is apparent from FIG. 3, the rear upper feed dog 2, the feed
The tooth surface 2c is located in the second half of the cloth presser foot in the cloth feeding direction.
As far as possible, the needle drop portion 19 enters the cut portion formed and does not come into contact with the presser foot 18 of the presser foot 10.
An extending portion 2A extending to a position close contact with, the fabric presser foot
10 of the presser portion 10A in the latter half of the cloth feeding direction in FIG.
A plane having an extension 2B extending to near the side edge 10Aa
Viewing are substantially L-shaped, thereby, together with a rubber material or the like on the rear surface of Tafutatafuta FABRICS to minimize the pressing area of the bottom surface 10a of the fabric presser foot 10 against the fabric coated with nylon thread, the Back upper
The contact area of the feed dog 2 with the feed dog surface 2c is made as large as possible .

Also, in the interlock sewing shown in FIG. 4, the operation is substantially the same as in the above-described overlock sewing, and the description thereof will be omitted.

[0022] Figure 5 is a bottom view showing a tooth surface 1b and the rear upper feed dog 2 of the tooth surface 2c of the front upper feed dog 1, when transferring the fabric Ryohamen 1b, and 2c both upper fabric after sliding the order not to generate, when the fabric is clamped by the lower feed dog (not shown) and a front upper feed dog 1 and the rear upper feed dog 2, and front upper feed dog 1 against Biting with upper feed dog 2
To be order as scratches, etc. does not occur in the fabric by only write, it is formed in a diamond cut shape, such as shown in Figure shown.

Next, the operation of the above configuration will be described. In the sewing operation, the fabric was folded or double-folded, for example, by operating a pedal (not shown) while raising the presser foot 10, the front upper feed dog 1, and the rear upper feed dog 2. Needle plate 1 with the surface coated with rubber etc.
After inserting and setting between the upper surface 15a of the base 5 and the bottom surface 10a of the presser foot 10, the operation of the pedal is released,
The upper surface 15a of the needle plate 15 and the lower surface 10 of the presser foot 10
a, It is pressed by the tooth surface 1b of the front upper feed dog 1. Next , by operating a sewing machine rotation pedal (not shown), the cloth end is cut by a well-known knife mechanism.
By the operation of the well-known lower feed mechanism, upper feed mechanism, needle bar mechanism, looper mechanism and the like, the fabric is sequentially fed in a predetermined direction, and desired sewing is performed. According to the above configuration, the presser foot 10
As for the form, the cloth is fed more than the connection to the holding hinge 11.
In the second half of the holding direction,
Cut off the area to be pressed and reduce the pressing area against the fabric
Also, the above-mentioned presser foot 10 can be substantially moved before and after along the cloth feeding direction.
By connecting to the presser hinge 11 at the middle part,
It is possible to secure the stability of the fabric holding action by the gold 10.
Wear. Further, the fabric presser foot 10 is formed in a form having a small fabric pressing area.
To move the tooth surface of the rear upper feed dog 2 to the above-mentioned presser foot.
Enter the cutout formed in the second half of the cloth feed direction in 10
And close to the presser foot 18 of the presser foot 10.
And extend it, and immediately after the cloth foot 10
Also, in the direction perpendicular to the cloth feeding direction,
Of the presser in the second half of the fabric
To form an approximately L-shape in plan view.
Therefore, the contact area of the rear upper feed dog 2 with the fabric is increased.
Is possible. In this way, the fabric holding action
Fabric pressing surface by the presser foot 10 while ensuring stability
Product as much as possible and with the rear upper feed dog 2
Synergy with maximizing the fabric contact area as much as possible
Rubber material on the back of taffeta (plain woven) fabric
Sewn fabric coated with high friction resistance
This fabric in cooperation with the upper and lower feed dogs 1 and 2.
By operation, it is possible to transfer smoothly in a predetermined direction
And reliably prevent puckering from occurring.
it can.

In the above embodiment, the case where the fabric coated with the rubber material or the like is sewn has been described . However, the present invention is not limited to this case. The present invention can be applied to a fabric or the like in which the occurrence of blemishes easily occurs, and substantially the same effects as in the above embodiment can be obtained. Also,
The front upper feed dog 1 and the rear upper feed dog 2 of the tooth surface 1b, 2c
The shape of is not intended to be limited to the diamond cut shape shown in Figure 5, if the transferring without damaging the fabric areas may be of any shape.

[0025]

[Effect of the invention] As described above, according to the invention,
After the cloth feed direction than the connection to the presser hinge
Cut the part of the half presser that corresponds to the edge of the fabric.
And remove the presser foot
Connects to the presser hinge at approximately the middle of the front and back along the direction
And in the second half of the fabric feed direction
Insert the tooth surface of the rear upper feed dog into the cut
Extending the presser foot to a position close to the presser foot
In the case that the direction perpendicular to the fabric feed direction is
In the second half of the cloth feed direction
Extend to near the inner edge of the part to make it almost L-shaped in plan view
With the configuration to form, the fabric presser
While satisfactorily ensure the stability of e effects, with reduced as much as possible the fabric pressing area by the cloth presser foot, after
It is the this <br/> to expand as much as possible the fabric contact area by the upper feed dog. By this, this invention is taffeta (flat
The back side of the woven fabric is coated with rubber etc.
Even when sewing fabric was higher frictional resistance, in cooperation with the feed dog on the fabric <br/> locations before and after, can be transferred to the Sum <br/>over's in a predetermined direction in, and Ru can be reliably prevented the occurrence of puckering.

[0026]Especially,PreviousUpper feed dog andTooth surface of rear upper feed dog
ToDiamond cut as claimed in claim 2Formed into a shapePass
IfThe peak of the tooth surface of the upper and lower feed dogs at the valley of the tooth surface of the lower feed dog
When the fabric is pressed and transported without the part entering
ofDamage to the fabric can be prevented.

[Brief description of the drawings]

FIG. 1 is a left side view of an upper feed device of an overlock sewing machine according to the present invention.

FIG. 2 is an exploded perspective view of a main part of the upper feed device.

FIG. 3 is a plan view showing a mode in which the upper feed device is used during overlock sewing.

FIG. 4 is a plan view showing a mode in which the upper feed device is used during interlock sewing.

FIG. 5 is a bottom view showing a tooth surface of a front upper feed dog and a tooth surface of a rear upper feed tooth which constitute the upper feed device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front upper feed dog 1b Tooth surface 2 Rear upper feed dog 2A Extension part 2B Extension part 2c Tooth surface 10 Cloth presser foot 10A Pressing part 15 in the second half of cloth feed direction 15 Needle plate 18 Cloth presser claw

Claims (2)

(57) [Scope of request for utility model registration] 1. A cloth presser foot for pressing the fabric on surface of the needle plate
And the cloth is moved by moving it in the upper half of the presser foot in the cloth feeding direction and in contact with the upper surface of the cloth.
Before the feed dog has a tooth surface that transferred to the feed direction, the fabric
Disposed in the second half portion of the cloth feeding direction fabric on top of the presser foot
Synchronized with the above-mentioned front upper feed dog in contact with the upper part of the ground
Fabric by moving a top feeder overlock stitch sewing machine having an upper feed dog after transferring the cloth feeding direction, the
The presser foot is approximately at the middle of the front-rear length in the feed direction.
And the connection point
Of the presser in the latter half of the fabric feed direction
The part corresponding to is formed in a cut-out form.
On the other hand, the rear upper feed dog has its tooth surface
Into the cutout formed in the second half of the
Extension building portion to the near contact position in the cloth presser claw cloth presser foot
And immediately after the presser foot,
After the cloth feed direction of the above-mentioned presser foot toward the crossing direction
A part extending to near the inner edge of the half holding part.
An upper feed device for an overlock sewing machine, wherein the upper feed device is formed substantially in an L-shape in a plan view . 2. A tooth surface of the front upper feed dog and the rear upper feed dog.
But feed on the overlock stitch sewing machine according to <br/> claim 1, characterized in that it is formed in a diamond cut shape device.