JPH0794968B2 - Fabric pattern detection head and pattern matching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention sewes a pattern detection head for detecting a pattern of a fabric, particularly a striped pattern or a woven pattern, and two large and small fabrics are overlapped and sewn. The present invention relates to a pattern matching device used in a process such as a process of cutting a process and a part cloth for the process.

[Conventional technology]

Generally, in the process of handling a fabric having a patterned pattern, for example, in the process of sewing a pocket fabric on a fabric of a waishatsu, or in the process of cutting a part fabric such as a woven fabric or its pocket fabric, the direction and position of the patterned pattern are changed. If they are not sewn or cut in line with each other, the result will be unsightly.

Therefore, for example, as shown in FIG. 9 (a), when the pocket 1 is sewn to the front body 2, as shown in the enlarged view of FIG. It is necessary to match the striped patterns 3 and 4 of the front body 2 with the striped patterns 3'and 4'of the pocket 1, respectively.

Therefore, as shown in FIG. 10, when the fabric 7 which is wrinkled and stretched by the spreading machine 5 and laminated on the table 6 is used as a mold, a striped pattern is formed on the fabric. Although the material 7 is cut so as to have substantially the same position, the striped pattern of the stretched cloth 7 may be shifted or the position of the cloth 7 may be shifted.

Therefore, the striped pattern of the patterned material 8 is not always located at the same position, and pattern matching is required to correct the deviation of the striped pattern.

In order to make this pattern matching, conventionally, as shown in FIG. 11 (a), a pin piercing base 10 in which a pair of pins are planted at a predetermined interval is generally used. Place it on the table 6 shown in the figure and stab the patterned material 8 one by one while visually observing it so that the first stripe 11 is on a straight line passing through the two pins 9 and 9. While matching the striped pattern, the 11th
They were laminated as shown in FIG.

Then, the dough 8 that has been thus patterned is
As shown in FIG. 12, in the trimming device 12, the trimming blade 13 trimmed into a desired shape, for example, a pocket shape.

In addition, recently, a method of capturing an image of a fabric with an image capturing device such as an ITV camera and processing the captured data with an image processing device so that the directions and positions of the patterns of the two fabrics coincide with each other, or reflected light from the fabric or An optical sensor (pattern detection head) that receives transmitted light through a light receiving element via an optical system and converts it into an electrical signal.
There has been developed a method of matching the pattern by detecting the direction and position of the pattern from the lightness and darkness of the pattern.

[Problems to be Solved by the Invention]

However, there is a problem in that it is very inefficient to manually stab the patterned fabrics one by one while visually observing the patterned fabrics using the pin piercing stand as described above.

Further, if the video camera and the image processing device are used, the direction and position of the pattern can be recognized with high accuracy, but there is a problem that the device is large and expensive and the processing time is long.

Furthermore, if a pattern detection head using an optical sensor is used, the pattern matching device can be constructed at low cost, but since it is detected by the spot, the pattern that can be detected is limited to a thick striped pattern with relatively bright and dark, There is a problem in that it is not possible to accurately detect narrow striped patterns and pattern patterns 14 (often in woven patterns, etc.) that consist of a collection of discontinuous points, especially as shown in an enlarged view in part in FIG. .

The present invention has been made in order to solve such a conventional problem, and can accurately detect a thin striped pattern or a pattern pattern composed of a collection of discontinuous points, and has a simple structure and is inexpensive. It is an object of the present invention to provide a pattern detection head and a pattern matching device capable of automatically and efficiently matching patterns.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the invention forms a lens for forming an image of a reflected light beam or a transmitted light beam from a detection point of a cloth whose pattern is to be detected and its periphery, a slit plate arranged at the image formation position, and Provided is a cloth pattern detection head provided with a light receiving element for receiving and photoelectrically converting a light beam passing through a slit formed on a slit plate.

Further, as the slit plate, it is preferable to provide a plurality of slit plates each having a different slit so that the slit plate can be selectively inserted into and removed from the image forming position of the lens.

Further, there is also provided a pattern matching device configured as follows using two (pair) of the pattern detecting heads.

A position correction table that is movable in a straight line direction and is rotatable around at least one specific point, and a handle of a cloth placed on the position correction table at two reference points at least at predetermined intervals. A pair of pattern detection heads for detecting each, a lighting means for illuminating at least a portion of the cloth including the two reference points, and a position correction table so that the pair of pattern detection heads can both output pattern detection signals. And a pattern matching control means for linearly moving and rotating.

[Work]

Since the cloth pattern detecting head according to the present invention has the slit plate disposed at the image forming position of the reflected light beam or the transmitted light beam from the detection point of the cloth and the periphery thereof, the width and direction of the slit can be detected. Depending on the direction and discontinuity, etc., the light receiving element photoelectrically converts the brightness of only the light flux passing through the slit and outputs it as a pattern detection signal. It is possible to accurately detect even a pattern composed of various points.

Further, the pattern matching device according to the present invention uses the pair of pattern detection heads to detect the pattern of the cloth to be pattern-matched at the two reference points spaced by a predetermined distance from each other on the position correction table. By linearly moving and rotating, the misalignment and inclination of the handle are automatically and efficiently corrected.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 3 is a block diagram showing an outline of a pattern matching system mainly composed of a pattern matching device using the pattern detecting head according to the present invention.

In this pattern matching system, the pattern detection / correction unit (II) in which the pattern matching device 20 is installed is centered, and the cloth 15 before pattern matching is provided on the upstream side.
And a pattern-matching laminating section (III) having a fabric table 22 for laminating and mounting the patterned fabric 15 on the downstream side. ing.

Furthermore, the 1st conveyance body 23 and the 2nd conveyance body 24 are provided, and the 1st conveyance body 23 is laminated | stacked on the dough table 21 of a laminated | stacked dough set part (I), for example, the dough which has a striped pattern.
Suck the top one from 15 with the suction pad 23a,
The pattern detection / correction unit (II) conveys (first conveys) and mounts it on the position correction table 26 provided in the pattern matching device 20 to enable pattern matching.

When the pattern of the cloth 15 on the position correction table 26 is finished, the second carrier 24 sucks it by the suction pad 24a and conveys it onto the cloth table 22 of the pattern matching laminating unit (III) (second conveyance). ) And stack them.

The pattern matching device 20 and the first and second carriers 23 and 24 are integrally controlled by the system controller 25.

The pattern matching device 20 includes a rotary table 27 that rotates the position correction table 26 in the arrow R direction, a linear feed table 28 that linearly moves in the arrow Y direction by the driving force of the stepping motor 29, and a position correction table. A pair of handle detection heads 30A, 30B are provided above the unit 26 upright at a predetermined distance from each other and held by the device fixing portion by a supporting member (not shown).

The details of the pattern detection heads 30A and 30B, the illumination means, and the signal processing device in the system control unit 25 will be described with reference to FIG.

The pair of pattern detection heads 30A and 30B have exactly the same structure, and in each of the cylindrical casings 31 each having an opening formed on the lower surface thereof, a reflected light beam or a transmitted light beam from the detection point of the cloth whose pattern is to be detected and its periphery. A lens 32 for forming an image (reflected light beam in this embodiment), a slit plate 33 arranged at the image forming position, and a light beam passing through a slit 33a formed on the slit plate 33 are received and photoelectrically converted. A light receiving element 34 such as a phototransistor or a photodiode is provided.

In this embodiment, the detection points of the respective pattern detection heads 30A, 30B are set as the two reference points A, B for the cloth 15 placed on the position correction table 26.

The slit plate 33 is a slit plate unit clearly shown in FIG.
Removably attached to a circular slit plate holding portion 38 provided at each tip end of a turret arm 37 radially provided at equal intervals (60 ° in the illustrated example) around the rotary shaft 36 of 35,
It is held with the slit direction facing the radial direction.

In this embodiment, two slit plate holding portions 38, 38 which are symmetrical (180 ° relationship) with respect to the rotation axis 36 of the turret arm 37 are provided with a pair of slit plates respectively formed with the same slit. 33, 33 ', 33 "are retained. The slit plates 33, 33' and 33" of each pair have different slit widths.

The slit plate unit 35 is supported by the support plate 40 between the handle detection heads 30A and 30B, and the rotation shaft 36 is rotated by the motor 39, whereby the turret arm is formed.
37 rotates, and the pair of slit plate holding portions 38, 38 are inserted through the openings formed on the opposite side surfaces of the casings 31, 31, and the images are formed by the lenses 32 of the handle detection heads 30A, 30B. At the same position, the same slit plate (in the state shown in FIG. 1, the slit plate 33 in which the thinnest slit 33a is formed) is arranged at the same time.

Reference numeral 50 denotes a light source device, a light source power source unit 51, a halogen lamp 52 which is powered by the light source unit and is turned on, and an aspherical convex lens 53 and a plano-convex lens 54 which collect light emitted by the halogen lamp 52. , And a fiber connector 55 into which the optical fiber 56 is inserted, and the light flux condensed by the two convex lenses 53 and 54 is introduced into the optical fiber 56.

The optical fiber 56 is branched into two on the way, and the tip of one optical fiber 56a is inserted and held in a bracket 57a attached to the lower portion of the handle detection head 30A, and the luminous flux emitted from the optical fiber 56a is convex lens 58a. Is slightly condensed to illuminate the reference point A and its surroundings.

The tip end of the other branched optical fiber 56b is inserted and held in a bracket 57b attached to the lower part of the handle head 30B, and the light beam emitted from it is slightly condensed by the convex lens 58b and set at the reference point B. And the surrounding area.

Reference numeral 60 denotes a signal processing device provided in the system control unit 25 shown in FIG. 3, which includes a power supply unit 61, a micro computer (CPU) 62 for performing arithmetic processing, an A / D converter 63, and an amplifier.
64 and an interface circuit (I / F) 65.

Then, the light receiving elements 34, 34 of the pair of pattern detection heads 30A, 30B.
The photoelectrically converted detection signals Sa and Sb are input, amplified by the amplifier 64, converted into digital signals by the A / D converter 63, and read by the CPU 62.

Then, the CPU 62 performs the arithmetic processing described later and outputs the control signals S ₁ and S ₂ to the pattern matching device 20 through the I / F circuit 65 to drive the rotary table 27 and the linear feed table 28.

As a result, the position correction table 26 is rotated in the direction of the arrow θ or −θ around a certain point such as one of the reference points A or B or an intermediate point thereof, and a direction orthogonal to the line connecting the reference points A and B. Move linearly in the (Y, -Y direction) to detect both handle heads 30
Fabric 15 so that A and 30B can detect the same stripe on pattern 15a together.
Correct the position of.

The rotary table 27 is operated by a driving means such as a stepping motor (not shown), and the linear feed table 28 is operated by a driving means such as a stepping motor 29 shown in FIG.

Next, the operation of this embodiment thus configured will be described.

First, the operation of the entire pattern matching system shown in FIG. 3 will be described with reference to the flow chart of FIG.

This pattern matching system is not under the control of the system controller 25, and is a state in which a large number of cut fabrics 15 to be patterned are laminated on the fabric table 21 of the laminated fabric set portion (I). The operation starts when the start button is pressed.

Accordingly, the first carrier 23 first grips the uppermost sheet of the laminated dough 15 from the laminated dough set portion (I) with the suction pad 23.

Then, the cloth 15 is conveyed to the pattern detection / correction unit (II) (first
Then, the material 15 is set on the position correction table 26.

After that, the pattern matching device 20 detects the pattern of the cloth 15 to correct the position (the details will be described later).

When the position correction in the pattern detection / correction unit (II) is completed, the position-corrected cloth 15 is again grasped by the second transport body 24 and transported to the pattern matching laminating unit (III) (second transport), Laminate on the dough table 22 there.

The above operation is repeated for the number of sheets of the cloth 15 laminated on the laminated cloth set portion (I), and the operation is ended when the pattern matching of all the laminated cloths is completed.

Here, an example of a subroutine of the process of "detecting the pattern and correcting the position of the cloth" during the operation of the flow chart (main routine) of FIG. 4 is shown in FIG. It will be described with reference to FIG.

The pattern detection heads 30A and 33B are the intensity (brightness and darkness) of the light flux passing through the slit 33a of the reflected light from the cloth 15 to the light receiving element 34.
A detection signal corresponding to is output, and the signal processing circuit 60 inputs the detection signal to determine whether or not the pattern is detected.

Generally, when there is a pattern such as a striped pattern of a darker color on a light-colored background, the amount of reflected light at the pattern part is smaller than that at the background part, so the pattern detection head (see the flow chart below). In the description, it is understood that the center of the handle is detected when the detection signals from the light receiving elements 34 of 30A and 33B (referred to simply as "head") become minimum.

Therefore, in the position correction subroutine shown in FIG. 5, first, the position correction table 26 on which the cloth 15 is placed in step 1 is linearly moved in the Y direction shown by the arrow in FIG. 1, and in step 2, a pair of heads 30A and 33B is moved. Move until at least one of them detects the pattern.

Since both heads 30A and 33B detect the pattern substantially at the same time, the process proceeds from step 3 to step 4, the linear movement of the position correction table 26 is stopped, the processing is terminated, and the process returns to the main routine of FIG.

However, as shown in FIG. 6, the pattern (striped pattern) 15 of the cloth 15
When a is inclined to the left downward with respect to the straight line connecting the reference points A and B, when the position correction table 26 is moved in the Y direction,
First, since the head 30B detects the handle 15a, the process proceeds from step 3 to steps 5 and 6 to stop the linear movement of the position correction table 26, and at the same time, rotate it in the direction of the arrow .theta. In FIGS.

When the head 30A detects the handle 15a, the process proceeds from step 7 to step 8 to stop the rotation of the position correction table 26, terminate the processing, and return to the main routine of FIG.

Further, as shown in FIG. 7, when the handle 15a of the cloth 15 is inclined downward to the right with respect to the straight line connecting the reference points A and B, the position correction table 26 is moved in the Y direction first, Head 30
Since A detects the pattern, the process proceeds from step 3 to steps 5 and 9 to move the position correction table 26 linearly in the direction of the arrow Y in FIGS. 1 and 7.

When the head 30B detects the pattern, the process proceeds from step 10 to step 11 to stop the linear movement of the position correction table 26 and rotate it in the direction of the arrow -.theta. In FIGS.

After that, when the head 30A detects the pattern, the process proceeds from step 12 to step 8 to stop the rotation of the position correction table 26 to end the processing and return to the main routine of FIG.

In this way, the fabric 15 is conveyed to the pattern-matching stacking portion after the position of the pattern 15a is corrected so as to match the straight line connecting the reference points A and B. When the fabrics are cut and sewn on top of each other, they can be overlapped so that the striped patterns match.

Next, another example of this position correction subroutine is shown in FIG.

In the previous example, the position correction table 26 was rotated about one reference point B, but in this example, it is assumed that it is rotated about the midpoint of the straight line connecting the two reference points A and B, and the rotation angle It is assumed that a means for detecting

When the operation is started, the position correction table 26 is linearly moved in the Y direction shown by the arrow in FIG. 1 in step 1 as in the example of FIG. 5, and in step 2, at least one of the pair of heads 30A and 33B detects the handle. Move until you do.

When the pattern 15a of the cloth 15 is parallel to the straight line connecting the reference points A and B, both heads 30A and 33B detect the pattern substantially at the same time. Therefore, the process proceeds from step 3 to step 4, and the position correction table 26
The linear movement of is stopped, the process is terminated, and the process returns to the main routine of FIG.

However, when the head 30B first detects the pattern, the process proceeds from step 3 to steps 5 to 8 to move the position correction table.
The linear movement of 26 is stopped, and the head 30A is reversely rotated until the pattern is detected, and the rotation angle θ is stored.

Next, in step 7, θ / 2 is calculated, and in step 10, the position correction table 26 is positively rotated by the calculated θ / 2 to end the processing, and the process returns to the main routine of FIG.

If the head 30A detects the handle first, the step
Go to steps 11 to 13 from steps 3 and 5 to move the position correction table 26.
The linear movement is stopped, and the head 30B is normally rotated until the head 30B detects the handle, and the rotation angle θ is stored.

When the head 30B detects the pattern, the next step 9
.Theta. / 2 is calculated, and in step 10, the position correction table 26 is reversely rotated by the calculated .theta. / 2 to end the processing and return to the main routine of FIG.

By the way, in the embodiment of the present invention shown in FIG. 1, since the slit plate 33 is inserted at the image forming position of the light flux reflected from the cloth 15 by the lens 32 of each pattern detecting head 30A, 30B, the light receiving element 34 is The received light beam is regulated by the shape of the slit 33a.

Therefore, the slit 33a of this slit plate 33, the pattern of the fabric 15 to be patterned, especially the direction and thickness of the striped pattern,
By selecting the shape, direction, and width according to the formation state (discontinuity, etc.), the noise component can be reduced and the intensity of the reflected light flux along the pattern from the fabric can be detected.
Various patterns can be accurately detected.

The slit plate unit 35 shown in FIG. 2 holds two slit plates of three types each, and a pair of pattern detection heads are held.
Since the same slit plate can be inserted into and removed from 30A and 30B at the same time, switching of the slit plate is extremely easy.

Furthermore, if you want to use a slit other than the slit of the slit plate that is held in advance in the slit plate unit 35,
The slit plate of the slit plate holding portion 38 can be exchanged, and when it is desired to change the direction of the slit, the slit plate can be rotated and held by arbitrarily changing the direction of the slit.

〔The invention's effect〕

As described above, by using the pattern detection head according to the present invention, by selecting the slit shape, it is possible to accurately detect a thin striped pattern of the cloth or a pattern pattern composed of a collection of discontinuous points, and the structure is It can be provided easily and inexpensively.

Further, by using the pattern matching device according to the present invention, it is possible to automatically and efficiently match the patterns of the fabrics when the two fabrics are overlapped and sewn or cut.
Moreover, although the device is relatively inexpensive, the types of applicable patterns are significantly increased as compared with the conventional device of this type.

[Brief description of drawings]

FIG. 1 is a block diagram showing details of a pattern matching device used in the pattern matching system shown in FIG. 3, FIG. 2 is a plan view of the slit plate unit, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a flow chart showing the operation of the embodiment of FIG. 3, FIG. 5 is a flow chart of a subroutine for similarly detecting the pattern and correcting the position of the cloth, FIG. 7 and 8 are explanatory views for explaining the operation thereof, FIG. 8 is a flow chart showing another example of a subroutine for detecting the pattern and correcting the position of the cloth, and FIG. 9 shows the necessity of pattern matching. FIGS. 10 to 12 are explanatory views of a conventional pattern matching method, and FIG. 13 is an explanatory diagram showing an example of a striped pattern that cannot be accurately detected by a conventional photosensor. 15 …… Fabric, 15a …… Design 20 …… Design matching device, 21, 22 …… Fabric table 23 …… First carrier, 24 …… Second carrier 25 …… System control unit 26 …… Position correction table , 27 ...... Rotary table 28 ...... Linear feed table 30A, 30B ...... Pattern detection head 31 ...... Case, 32 ...... Lens 33,33 ', 33 "...... Slit plate 33a ...... Slit, 34 ...... Receiving light Element 35 …… Slit plate unit, 36 …… Rotary axis 37 …… Tart arm, 38 …… Slit plate holding 39 …… Motor, 50 …… Light source device 52 …… Halogen lamp, 56 …… Optical fiber 60 …… Signal processing Device 62: Microcomputer (CPU)

Claims (3)

[Claims] 1. A lens for forming an image of a reflected light beam or a transmitted light beam from a detection point of a cloth whose pattern is to be detected and its periphery, a slit plate arranged at the image forming position, and a slit plate formed on the slit plate. A cloth pattern detection head, comprising: a light receiving element that receives a light beam that has passed through a slit and performs photoelectric conversion. 2. The cloth pattern detecting head according to claim 1, wherein a plurality of slit plates each having a different slit are provided so as to be selectively insertable into and removable from the imaging position of the lens. 3. A position correction table, which is movable in a linear direction and is rotatable around at least one specific point, and a handle of a cloth placed on the position correction table, are arranged at least at predetermined intervals. A pair of pattern detection heads that respectively detect at two reference points, an illumination unit that illuminates a portion of the cloth including at least the two reference points, and the pair of pattern detection heads can both output a pattern detection signal. A pattern matching control means for linearly moving and rotating the position correction table, wherein each of the pair of pattern detecting heads is the pattern detecting head of the cloth according to claim 1 or 2. apparatus.