JPH0217574Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention uses an image sensor to detect the position of a notch, etc. formed at the edge or middle of cloth fed by the cloth feeding means of a sewing machine. The present invention also relates to a device that generates a cloth position signal for controlling devices of a sewing machine, such as a feed adjustment device that operates in connection with cloth feed of the sewing machine.

[Prior Art] A conventional example in which an image sensor is used in a facsimile machine will be described with reference to FIG.

The image sensor 1 includes a light emitting part 1a in which a plurality of light emitters are arranged in a line and a light receiving part 1b in which a plurality of light receivers are arranged in a line, which are arranged in parallel, and detect the object in relation to the detection position of each light receiver. It generates a position signal, and is fixed so that the center line c of the incident optical axis a from the light emitting part and the reflected optical axis b to the light receiving part forms a predetermined inclination angle θ with respect to the perpendicular. A paper feed drum 1c is supported below the image sensor 1 so as to be rotatable and not perpendicular to the tangent at the point where the center line c intersects with the paper feed drum 1c. By lowering the sensitivity of the image sensor 1, it detects only the dark colored information parts such as characters and figures in the transmission document 1d being transported by the paper feed drum 1c, and detects the edges of the paper and light colored parts. By not detecting contamination, the aim is to obtain a transmission signal with less noise.

[Problems to be solved by the invention] When an image sensor is used to detect the position of cloth fed by the cloth feeding means of a sewing machine, the center line c is provided at an angle with respect to the perpendicular line as described above. , when the detection light emitted from the light emitting part 1a is reflected on a horizontal surface, only a small amount of the detection light returns to the light receiving part 1b, which lowers the detection sensitivity. One had to be sacrificed.

The present invention is intended to solve these drawbacks, and aims to increase the detection sensitivity of an image sensor by providing a reflecting plate having a reflecting portion substantially perpendicular to the center line.

[Means for Solving the Problems] This invention is based on a sewing machine having a cloth feeding means for horizontally feeding cloth to a seam forming section, in which a light emitting section consisting of a plurality of light emitters and a light receiving section consisting of a plurality of light receptors are used. One side of the cloth is arranged in parallel, and the center line of each incident optical axis and reflected optical axis is arranged at a predetermined angle of inclination with respect to the perpendicular line, and one side of the cloth is fed by the cloth feeding means along the cloth feeding path in front of the cloth feeding direction. A cloth detection device for a sewing machine, comprising: an image sensor provided on one side; and a reflection plate disposed opposite a detection means on the other side of the cloth and forming a reflection portion substantially perpendicular to the center line. It provides:

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

In FIG. 1, 2 is a sewing machine head, 3 is a sewing machine bed, and 4 is a well-known cloth guiding means having a manipulator 6 for guiding the side edges of upper and lower cloths W ₁ and W ₂ to cloth feeding means 5 of the sewing machine.

Reference numeral 7 denotes a base having an upper surface at the same height as the sewing machine bed 3, and a detection means 8 is provided along the cloth feeding path at the front in the cloth feeding direction.

3 is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line B--B in FIG. The detection means 8 has the following configuration. Reference numeral 9 denotes an image sensor for detecting the upper cloth W ₁ , in which a light emitting part 9a in which a plurality of light emitters arranged at an angle are arranged in a row and a light receiving part 9c in which a plurality of light receivers are arranged in a row are arranged in parallel. base 10
The sensor base 10 is fixed with the screw 9c to the elongated hole 1.
It is fixed to the base 7 via a spacer 13 by a screw 12 inserted through the base 7 so as to be movable and adjustable perpendicular to the feeding direction. Reference numeral 14 denotes an image sensor for detecting the lower cloth _W2 , in which a light emitting part 14a in which a plurality of light emitters provided at an angle are arranged in a row and a light receiving part 14b in which a plurality of light receivers are arranged in a row are arranged in parallel; It is fixed to the sensor base 15, and the sensor base 1
5 is fixed to the base 7 with screws 17 so that it can be exposed through a long hole 16 provided in the base 7 so that the optical axes a and b of the image sensor 14 are parallel to the image sensor 14.

18 are image sensors 9 and 14 arranged above and below.
It is a reflective plate placed between the upper and lower cloths _W1 and _W2 , and is fixed to the base 7 via a spacer 13 by a screw 17 inserted into a long hole 19 so as to be movable perpendicular to the feeding direction. It has been done.

Image sensors 9 and 1 are located in the middle of the reflecting plate 18.
Reflective portions 19a are formed to be bent substantially perpendicularly to the center lines c of each of the four. The reason why they are made substantially orthogonal is that even if the reflected light deviates from the light receiving section 9b by about 1 mm, it can be covered because the light emitting section 9a is large.

More specifically, the upper surface of this reflective section 19a is
When the upper cloth W ₁ is removed, the detection light emitted from the light emitting part 9a of the image sensor 9 has a certain degree of spread, is reflected by the reflective part 19a, and can be received by the light emitting part 9b, and the lower surface of the reflective part 19a is When the lower cloth _W2 is removed, the detection light emitted from the light emitting part 14a of the image sensor 14 has a certain degree of spread, is reflected by the reflecting part 19a, and can be received by the light emitting part 9b. Note that 20 is a transparent guide upper plate.

This reflecting portion 19a allows the image sensor 9,
14 increases, and the change in the amount of light emitted by the image sensors 9 and 14 when there is no cloth and when there is cloth becomes large.
The presence or absence of cloth can be reliably detected regardless of the type of white or black cloth.

[Effects of the invention] The structure and operation of the invention are as described above. Since the reflection plate is provided with a reflection part that is substantially orthogonal to the center line between the incident optical axis of the image sensor and the reflected optical axis, the sensitivity of the image sensor is improved. and can detect either white cloth or black cloth.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is a perspective view of a sewing machine equipped with an image sensor; Fig. 2 is a vertical cross-sectional view of a conventional facsimile machine equipped with an image sensor; and Fig. 3 is the same as Fig. 1A. - A cross-sectional view, 4th
The figure is a partial sectional view taken along the line B--B in FIG. 1. 1, 9, 14... Image sensor, 1a, 9
a, 14a... Light emitting part, 1b, 9b, 14b...
Light receiving section, 1c...Paper feed drum, 1d...Document,
2... Sewing machine, 2a... Bed, 3... Table, 4... Cloth guiding means, 5... Cloth feeding means, 7...
... Base, 8 ... Detection means, 10, 15 ... Sensor base, 13 ... Spacer, 18 ... Reflection plate,
19a...Reflection part, 20...Transparent guide upper plate, a
...Incidence optical axis, b... Reflection optical axis, c... Center line,
W ₁ ... upper cloth, W ₂ ... lower cloth.

Claims (1)

[Claims for Utility Model Registration] A sewing machine having a cloth feeding means for horizontally feeding cloth to a seam forming part, in which a light emitting part made of a plurality of light emitters and a light receiving part made of a plurality of light receptors are arranged in parallel,
The center line of each incident optical axis and reflected optical axis is arranged at a predetermined inclination angle with respect to the perpendicular line, and is provided on one side of the cloth fed by the cloth feeding means along the cloth feeding path in front of the cloth feeding direction. 1. A cloth detection device for a sewing machine, comprising: an image sensor; and a reflection plate disposed on the other side of the cloth to face a detection means and formed with a reflection portion substantially perpendicular to the center line.