JPH0335271Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cloth regulating device that positions the cloth conveyed to the needle drop section of a sewing machine at an appropriate position.

[Prior Art] Conventionally, when performing hem hem stitching, top stitching, hem stitching, etc., a fixed fabric ruler provided on the front side of the needle drop of the sewing machine body has a guide surface that is folded into three, for example. The edge portion of the fabric is brought into contact with the cloth, and the edge portion is fed into the needle drop portion along the guide surface. However, when using a fixed cloth ruler to guide the fabric, if there is a stitched part in the middle of the fabric, the stitched part protrudes from the edge of the fabric, so it cannot be used as a ruler. When they come into contact with each other, the edge of the fabric separates from the guide surface of the ruler, causing problems such as unstitching and crooked seams.

Therefore, conventionally, a sensor is installed in front of the cloth guard ruler to detect the sewing step, and when the sensor is turned on or off, a motor or the like is operated to move the cloth guard ruler back a certain distance. A device has been proposed that prevents the fabric from slipping due to contact with a fabric ruler.

[Problems to be solved by the invention] However, in the conventional device described above, the cloth ruler is moved back a certain distance depending on whether the sensor is turned on or off, that is, whether or not the sensor detects a seam step. Therefore, there was a problem that it could not be applied to fabrics having stitched sections of different thicknesses. For example, if the thickness of the fabric becomes large and the thickness of the sewing step increases accordingly, even if the cloth abutment ruler moves back, the fabric will still be affected by the contact between the sewing step and the cloth abutment ruler. If a misalignment occurs, or conversely, if the thickness of the seam becomes smaller, the seam will not come into contact with the fabric ruler, and the fabric will not be regulated at all, so please do not do anything during this time. Cloth tends to shift due to shocks, vibrations, etc.

This invention was developed in view of the above-mentioned problems, and the purpose is to provide a fabric regulating device for a sewing machine that can always position the fabric at the appropriate position regardless of the thickness of the stitched section. .

[Means for Solving the Problems] This invention provides a cloth guide ruler that forms a cloth guide surface that comes into contact with the edge of the cloth to be conveyed in front of the needle drop point, and also A detection means for detecting the thickness of the sewing step formed on the cloth is provided at the front,
Further, the cloth abutment ruler is moved by the ruler moving means in a direction perpendicular to the cloth conveying direction in accordance with the thickness of the sewing step portion detected by the detecting means.

[Operation] In this invention, as the sewing of the cloth progresses and the sewing step formed on the cloth approaches the cloth abutment ruler, the detection means detects the thickness of the sewing step just before the sewing step reaches the cloth abutment ruler. The thickness is detected, and the cloth abutment ruler is moved according to the detected thickness, so that the sewing step portion is brought into contact with the cloth guide surface of the cloth abutment ruler in an appropriate state.

[Example of the invention] Hereinafter, an example of the invention will be described based on the drawings.

1 to 5 are diagrams showing an embodiment of this invention.

In the figure, reference numeral 1 denotes a ruler stand attached in front of the needle drop point P. A cloth guide part 2 is protruded from this ruler stand 1, and the protruding end 2a of this cloth guide part 2 is connected to the side edge of the cloth c. It is located on the passage route of c1. 3 is a guide plate fixed to the side surface of the ruler stand 1 with screws 4;
A groove 3a is formed in the guide plate 3 on the surface facing the ruler stand 1. Reference numeral 4 denotes a fabric ruler that is fitted into the groove 3a of the guide plate 3 and can move forward and backward in a direction perpendicular to the fabric conveyance direction a. The fabric ruler 4 has an L-shape with one side extending toward the needle drop point P, and has a guide surface 4a parallel to the fabric conveyance direction a. Reference numeral 5 denotes a guide rod fitted into the ruler stand 1 so as to be movable in a direction perpendicular to the cloth conveyance direction a, and its tip end is connected to a notch 2b formed in the cloth guide part 2 of the ruler stand 1.
It protrudes further, and the rear end protrudes from the rear end surface of the ruler stand 1. Reference numeral 6 denotes a detector fixed to the tip of the guide rod 5, which can be fitted into the notch 2b of the cloth guide section 2, and is always moved by a spring 7 in a direction perpendicular to the cloth conveying direction a. energized. Reference numeral 8 denotes a stopper fixed to the rear part of the detection rod 5, and the stopper 8 moves the position of the detection element 6, which is urged by the spring 7 in a direction perpendicular to the cloth conveyance direction a, onto the passage path of the cloth side edge c1. It is designed to be positioned. 9 is a magnet fixed to the rear end of the detection rod 5 via a magnetic holder 9a; 10 is a magnetic detector;
It is designed to output a signal having a value corresponding to the distance from the magnet 9, and the detection means A is constituted by the above 5 to 10. 11 is a pulse motor that rotates by an angle according to the output value of the magnetic detector 10, 12 is a rotating arm fixed to the motor shaft 11a of the pulse motor 11, and 13 is this rotating arm 12.
A connecting arm that connects the cloth ruler 4 with the screw 1
4 and 15, each of which is rotatably connected. 16 is a stopper screw that restricts the rightward rotation of the rotating arm 12 in FIG. Above 1
1 to 16 constitute a ruler moving means B.
In addition, as shown in FIG. 5, 17 is a skirting blade fixed to the ruler stand 1, which has a U-shape, and is used to bend the cloth c into an S-shape as shown in FIG. The cloth is fed out onto the cloth guiding surface of the cloth ruler 4. Further, in FIG. 5, M is the sewing machine body, and N is the needle.

Based on the above configuration, the operation will be explained next.

The cloth that is bent into an S-shape by the hemming blade 17 is
The side edge c1 is connected to the protruding end 2a of the cloth guide part 2 and the guide surface 4a of the cloth ruler 4 at the front and back of the hemming blade 17.
The material is conveyed while being regulated by coming into contact with the material. At this time,
The detector 6 remains located on the passage path of the cloth side edge portion c1 and does not move at all. Therefore, the output value from the magnetic detector 10 does not change at all, and the stepping motor 11 does not operate. After this, the sewing operation progresses and when the sewing step c2 of the cloth c reaches the top of the detector 6, the sensing element 6 is moved inward of the notch 2b by the thickness of the sewing step c2 into the spring 7. At the same time, the magnet 9 moves in the same direction, and the distance between it and the magnetic detector 10 narrows. As a result, the output value from the magnetic detector 10 increases in accordance with the approach distance of the magnet 9. Upon receiving this output, the stepping motor 11 rotates the rotating arm 12 in the counterclockwise direction in FIG. (move in the direction of arrow b). As a result, the sewing step portion c2 moves smoothly and in an appropriate state while coming into contact with the guide surface 4a of the cloth abutment ruler 4. Therefore, the cloth ruler 4 and the sewing step part c2
The cloth c will not shift due to contact with the cloth c.
After the sewing step c2 passes through the guide surface 4a of the fabric ruler 4, the stepping motor 11 is reversely rotated to return to the initial position, thereby returning the fabric ruler 4 to its initial position. For example, the number of stitches from when the stepping motor 11 starts driving until the sewing step part c2 finishes passing through the cloth guide surface 4a is set in advance, and the counter is set at the same time as the stepping motor 11 starts driving. is activated to count the number of stitches, and when the set value is reached, stepping motor 1 is activated.
This can be realized using various well-known control methods, such as returning 1.

FIG. 6 is a diagram showing another embodiment of this invention.

In this second embodiment, a stepping motor 18 is used instead of the ruler moving means B in the first embodiment.
A ruler moving means B' using the driving force of the magnet 19 is also provided.

That is, the ruler moving means in this embodiment
B′ is, when the output value of the magnetic detector 10 changes,
Magnet 19 turns OFF, and the rod 19
The cloth ruler 4 is moved backward by a. Further, the stepping motor 18 rotates according to the amount of change in the output of the magnetic detector 10, and a stopper 20 screwed onto the motor shaft 18a rotates.
is moved forward and backward relative to the support member 21, and the rod 19
It is designed to control the retractable position of a.

In this way, according to the ruler moving means B',
The amount of movement of the ruler can be controlled using a magnet 19 for moving the ruler, which has conventionally been included in this type of device.

In the above embodiment, the thickness of the stepped portion is detected using the magnet 19 and a magnetic detector, but it is also possible to detect the thickness using a photoelectric conversion element, an encoder, or the like. Also,
In that case, it is also possible to detect it without contacting the cloth without using the detector 6 or the like.

[Effect of the invention] As explained above, according to this invention, there is an effect that the cloth can always be positioned at an appropriate position for any cloth, regardless of the thickness of the sewing step portion.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of this invention, FIG. 2 is a partially exploded perspective view of the device shown in FIG. 1, FIG. 3 is a plan view showing the ruler moving means shown in FIG. 1, and FIG. Fig. 4 is a side view showing the hemming blade applied to this embodiment, Fig. 5 is a partially cutaway perspective view showing the configuration around the needle drop portion of the sewing machine applied to this embodiment, and Fig. 6 is a side view showing the hemming blade applied to this embodiment. FIG. 7 is a plan view showing another embodiment of the invention. 4...Fabric ruler, P...Needle drop point, c...Fabric, c
1... edge of cloth, A... detection means, B, B'...
means of movement of the ruler.

Claims (1)

[Scope of Claim for Utility Model Registration] A fabric guide surface that is provided before the needle drop point and that comes into contact with the side edge of the fabric being conveyed, and a tip that is formed apart from the fabric guide surface along the fabric feeding direction. and a cloth guide provided between the cloth guide surface and the protruding end of the cloth guide, which is in contact with the side edge of the cloth to detect the thickness of the sewing step formed on the cloth. A cloth regulating device for a sewing machine, comprising: a detecting means; and a ruler moving means for moving the cloth abutment ruler in a direction perpendicular to a cloth conveyance direction in accordance with the thickness detected by the detecting means.