Detection device for stitching defect
A detection device and defect technology, which is applied in the direction of sewing machine control devices, sewing equipment, sewing machine components, etc., can solve the problems of not being able to correspond to special sewn products, single warning sound, and difficulty in improving work efficiency, etc.
Inactive Publication Date: 2002-03-27
PEGASUS SEWING MASCH MFG CO LTD
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AI Technical Summary
Problems solved by technology
As a result, it is difficult to improve work efficiency
In addition, although such a device generates a warning sound when detecting poor sewing, the warning sound is single, and it is difficult to determine which sewing machine is causing poor sewing when a plurality of sewing machines having the device are used adjacently.
In addition, the detection of poor sewing cannot be invalidated, and it cannot correspond to special sewing products.
Method used
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Embodiment Construction
[0016] Embodiments of the present invention will be described below with reference to the accompanying drawings. figure 1 It is a perspective view of main parts showing an embodiment of the present invention. Reference numeral 2 is a needle plate, which forms a part of the placing table 1 for gray fabrics. The fabric (not shown) on the needle plate 2 is conveyed in the fabric conveying direction F by the presser foot 3 arranged on the needle plate 2 and the feed dog 4 coming in and out from the feed dog groove 2a of the needle plate 2 . A cutter 5 is disposed in front of a sewing machine needle (not shown) penetrating through a needle plate hole of the needle plate 2 . The edge portion of the gray cloth is trimmed by the vertical movement of the cutting knife 5 .
[0017] A sensor 6 is arranged on the front side of the cutter 5 . The sensor 6 is composed of a light emitting element 6a and a receiving element 6b. The light emitting element 6a is fixed on the front end of t...
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An apparatus for detecting defective sewing comprises a sensor and a control circuit. The sensor is disposed near a needle drop portion of a needle plate and detects the quantity of light transmitted through cloths passing over the needle plate. The control circuit determines defective sewing from increase and decrease of said light quantity. The control circuit comprises means for storing the averaged value of the light transmitted in a few stitches of initial sewing operation, and means for determining defective sewing continuously from the initial sewing operation by comparing the average value with the value of the light transmitted and detected each time. Thus, it is possible to immediately start the practical sewing operation without taking time for test sewing or other extra jobs even when every cloth to be sewn is different in properties.
Description
technical field [0001] The present invention relates to a poor sewing detection device, which is used to detect the thread-off caused by dislocation along the arrow X direction on the side ends W1a, W2a of gray fabrics W1, W2 during the sewing process (refer to Figure 4 ) and the sewing misalignment generated on the terminal sides W1b, W2b of gray fabrics W1, W2 along the arrow Y direction (refer to Figure 5 ) and other poor sewing. Background technique [0002] This device is disclosed in the official gazette No. 59-25349 of Japan. This device has a sensor arranged on the front side of the needle plate hole of the needle plate to detect the amount of transmitted light of the gray cloth passing on the needle plate, and detects sewing failure based on the increase or decrease of the amount of transmitted light of the gray cloth detected by the sensor. control circuit. According to this device, the fabric passing through the needle plate is transmitted by the sensor, and s...
Claims
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IPC IPC(8): D05B35/00D05B69/00D05B69/36
CPCD05B69/36
Inventor 川人俊夫斋藤正仁
Owner PEGASUS SEWING MASCH MFG CO LTD