JPH0243346Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of an automatic dart sewing mechanism.

<Prior Art> Conventionally, darts for clothing have been sewn by skilled workers using sewing machines. On the other hand, due to the promotion of automation, dedicated machines were sometimes used. This specialized machine uses a gripping member with multiple claws to hold the seam allowance area of the fabric that forms the dart along the seam allowance, and is configured to slide while holding the fabric one after another until the needle drops. be. To explain in detail, one part divided by the seam allowance on the fabric,
The gripping member grips and slides the fabric up to the needle drop.

<Problems that the invention aims to solve> However, manual methods were very disadvantageous in that they required the training of experts and it was difficult to achieve uniform quality. This is because it is difficult to sew in a straight line due to the expansion and contraction of the fabric, and the seam often curves beyond the seam allowance. Furthermore, even if the above-mentioned dedicated machine was used, there were problems such as its high cost and the fact that the fabric could not be used for knitwear or the like. This is because the part held by the grip part is only one part of the fabric divided by the seam allowance, and the other part of the fabric is free, and the grip part is held by multiple claws. This is because the structure that holds the fabric, that is, the part that grips the fabric, is a point. Even if an expensive dedicated machine is used, this structure causes skipped stitches when used for knitwear, etc. due to the uncertainty in holding the fabric.

The present invention aims to solve the above problems.

<Means for Solving the Problems> The present invention provides an automatic dart sewing mechanism that transports the material to be sewn, such as cloth, toward the needle entry point of a sewing machine, etc., in which the material to be sewn is loaded at least up to the needle entry point. The mounting section has a holding section that presses the material to be sewn onto the mounting section from above, and the mounting section has a sharp blade extending along the transport direction of the material to be sewn and facing upward. The holding part has an appropriate number of first blade parts that form sharp blades along the direction of transport of the material to be sewn and faces downward. As a result, the first blade portion and the second blade portion mesh with each other, and the material to be sewn can be transferred between the double blade portions in the needle drop direction relative to the double blade portions. Characteristic Automatic Dart Sewing Mechanism The first blade section is configured such that the width between its base and the blade tip gradually decreases as it approaches the needle entry point, that is, the width of the first blade section becomes lower as it approaches the needle entry point. An object of the present invention is to provide an automatic dart sewing mechanism according to item 1, characterized in that the dart sewing mechanism is formed at an angle.

<Function> In the present invention having the above-mentioned means, the sharp first and second blade portions are in line contact with the material to be sewn, so that the sewing material can be sewn into the desired area of the material to be sewn or It bites into the vicinity and holds it down without causing wear in directions other than the transport direction. Furthermore, since this pressing is performed by line contact, there is little resistance in the transport direction and the material to be sewn can be transported smoothly.

Since the placement position of the material to be sewn becomes lower as it approaches the needle drop, the material to be sewn can be sewn regardless of its thickness.

<Embodiments> A preferred embodiment of the invention will be described in detail below by way of example with reference to the drawings. However, the dimensions, shapes, materials, relative positions, etc. of the components described in this example are not intended to limit the scope of this invention, unless specifically stated. , is merely an illustrative example.

FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a plate-shaped body that is attached to a surface on which a material to be sewn is placed in front of the needle droplet 3 of the sewing machine. It is effective in terms of versatility if the plate-shaped body 1 is fixed to the sewing machine by tightening the screws 2, etc., and is configured to be removable. Reference numeral 2' denotes a hole provided in the plate-like body 1 for the above-mentioned screw fixing. The material to be sewn H is sent in the direction of arrow X in the figure. 4 is a pressure shaft already installed in the sewing machine. A rail 5 having a substantially U-shaped cross section is provided on the surface of the plate-like body 1. This rail 5 has both U-shaped ends protruding upward, and its longitudinal direction is arranged parallel to the arrow X mentioned above. Both U-shaped ends of the rail 5 are formed with blades that are sharp enough not to damage the material to be sewn. Details regarding this will be described later.
The longitudinal end 5' of the rail 5 extends to just before the needle drop. At a position facing the inside of this rail 5 from above,
A blade 6 having a sharp blade so as not to damage the material to be sewn is arranged. At least a portion of the blade 6 is held by a guiding means such as an actuator 7, so that the blade can be guided into the rail 5 from above. The actuator 7 causes the blade 6 to urge the material to be sewn H placed on the rail 5 into the rail 5 (in the direction of arrow Y). The actuator 7 is an external compressor or the like (not shown).
The fluid pressure is supplied by. This guiding means is not limited to the illustrated hydraulic actuator, but may be other mechanical means. Furthermore, if the configuration near the blade 6 is made removable to the sewing machine, it will be effective in terms of versatility, in combination with the above-mentioned plate-shaped body 1 having the rail 5. Reference numeral 8 denotes an intervening plate for fixing the tip of the actuator 7 (cylinder rod) and the blade 6, and the two are screwed together via this. Of course, the actuator 7 and the blade 6 may be fixed by welding or other means. Further, in order to stabilize blade holding and smooth operation, a blade holding means at a different position together with the actuator will be described later with reference to FIGS. 3, 4, and 4. This configuration is omitted in FIG.

The holding state of the aforementioned material to be sewn H will be described in detail with reference to FIG. 2. The U-shaped ends of the rail 5 gradually become thinner upward, forming a blade E. The ones shown are tapered on one side, that is, on the outside of the U-shape, but they may be tapered on both sides, or conversely, they are tapered on the inside of the U-shape. It may be hot. Alternatively, the two ends of the U-shape may be tapered in the same plane. The blade E' of the blade 6 is formed so that its thickness gradually decreases downward. Although this is also shown in the figure with tapers on both sides, it may be implemented with tapers on only one side, similar to the blade E of the rail 5.

By meshing the blades E, E, and E', each blade bites into the material to be sewn H sandwiched between the blades.
That is, it makes line contact with the material to be sewn H (it appears to be a point contact in FIG. 2). Therefore, due to the small contact area,
The coefficient of friction between the blade and the material to be sewn is significantly lower than the coefficient of friction between the folded material to be sewn and the material to be sewn, so that the material to be sewn is not worn. Further, due to the reduction in friction, the material to be sewn can be smoothly transported in the direction of arrow X in FIG.

Also, each blade may be used in any number of pieces. For example, blade E,
E may be implemented with a number other than two, and the number of blades E' or the number of blades 6 may be correspondingly increased. Further, the shape of the blade 6 is not limited to the shape shown in the drawings as long as it has a sharp portion as the blade E'.

FIG. 3 shows an embodiment of the holding portion of the blade 6 other than the actuator 7 described above. Here, the structure around the rail 5 is omitted to avoid complicating the diagram. The blade holder 10 is fixed to an appropriate position of the sewing machine arm 9, which is located above the needle drop and maintains the configuration near the needle drop, by tightening a screw 11 or the like. This holder 10 holds the blade 6 via a joint arm 12. One end of the joint arm 12 is fixed to the holder 10 by a shaft 13. A blade 6 is fixed to a shaft 14 at the other end of the joint arm 12. The blade 6 may be moved around any one of the shafts 13 and 14 by the biasing of the actuator 7;
Both shafts 14 may be configured as joints to facilitate smooth movement of the actuator. It is also effective to insert needle bearings into the shaft 13, the shaft 14, or both to smoothen rotation.

FIG. 4 is a plan view of the configuration shown in FIG. 3 above. Also here, the structure around the rail 5 is omitted.

An embodiment that deals with changes in the thickness of the material to be sewn H will be described below. Referring to FIG. 1 again. The height of the longitudinal rear end 5'' of the rail 5 described above is different from the height of the tip 5', and the cutting edge of the rail 5 is arranged with a slope so that the tip 5' side is lower. Therefore, there is no need to make adjustments even if the thickness of the fabric to be sewn changes.

With each of the above-mentioned configurations, the present invention can improve the efficiency of sewing operations such as various darts, tucks, pleats, etc., and can easily sew two pieces together, three pieces together (or more pieces together). It is possible.

<Effects of the invention> By implementing the invention, sewing such as dart sewing can be performed automatically and reliably. Furthermore, since the structure is simple, it is highly effective in reducing costs.

Furthermore, when the thickness of the fabric to be sewn changes, there is no need for new configurations or adjustments, and versatility can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an embodiment of the present invention. FIG. 2 is a front view of the main part. FIG. 3 is a side view of FIG. 2. FIG. 4 is a plan view. 5...Rail, 6...Blade, E, E, E'...
…blade.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In an automatic dart sewing mechanism that transports a material to be sewn, such as cloth, toward the needle entry point of a sewing machine, etc., a placing part on which the material to be sewn is placed at least until the needle entry point; , a holding part that presses the material to be sewn onto the mounting part from the upper part, and the mounting part has an appropriate number of first blades that form sharp blades along the transport direction of the material to be sewn and facing upward. On the other hand, the pressing part has an appropriate number of second blade parts that form sharp blades along the transport direction of the material to be sewn and facing downward, so that the first blade shape An automatic dart sewing mechanism characterized in that the part and the second blade part mesh with each other, and the material to be sewn can be transferred between the double blade parts in the needle drop direction relative to the double blade parts. . 2 The first blade portion is formed to be inclined so that the width between its base and the cutting edge gradually decreases as it approaches the needle drop, that is, the blade portion becomes lower as it approaches the needle drop. 1. An automatic dart sewing mechanism as set forth in claim 1 of the utility model registration claim.