Method and device for minimizing stitching faults in embroidering devices

Abstract

A method and the device for minimizing stitching faults in embroidery devices ( 1 ) is provided, which includes a drive for moving the material holder ( 13 ), with an article to be sewn ( 11 ) being stretched therein, based on the knowledge that such stitching faults frequently can be explained by oscillations of the article to be sewn ( 11 ) and the material holder ( 13 ) due to rapid accelerations. Various effects, such as different types of articles to be sewn, changing weights, and friction ratios can cause a change of the oscillation behavior. One or more sensors ( 29, 43, 44 ) are provided and arranged such that they can detect the oscillation of the article to be sewn ( 11 ) and/or the material holder ( 13 ). The control of the drive and/or the sewing needle ( 23 ) occurs depending on the detected oscillations such that deviations of the stitching site from the predetermined target value is minimized.

1 . A method for minimizing stitching faults in embroidering devices ( 1 ) which include a material holding device ( 13 ) for stretching an article to be sewn ( 11 ) and with a driving device ( 18 ) for positioning the material holding device ( 13 ) in reference to a stitch formation device in order to perform sewing stitches at predetermined target positions, the method comprising: detecting oscillations of the article to be sewn ( 11 ) or the material holding device ( 13 ).  
   
   
       2 . A method according to  claim 1 , further comprising: 
 controlling the driving device ( 18 ) and/or the stitch formation device depending on the detected oscillations of the article to be sewn ( 11 ) or the material holding device ( 13 ) and minimizing deviations of actual stitching sites from the corresponding predetermined target positions caused by the oscillations.    
   
   
       3 . A method according to  claim 1 , further comprising: 
 determining dependencies of motion patterns of the driving device ( 18 ) and an oscillation behavior of the article to be sewn ( 11 ) stretched in the material holding device ( 13 ).    
   
   
       4 . A method according to  claim 3 , further comprising: 
 saving data in a storage unit, from which dependencies can be deducted between the motion patterns of the driving device ( 18 ) and the oscillation behavior of the article to be sewn ( 11 ) stretched in the material holding device ( 13 ), or from which an optimized control of the driving device ( 18 ) can be deducted in that the deviation of the actual stitching sites from the corresponding target values are minimized.    
   
   
       5 . A device for minimizing stitching faults in embroidery devices ( 1 ), comprising a material holding device ( 13 ) for stretching the article to be sewn ( 11 ) and a driving device ( 18 ) for positioning the material holding device ( 13 ) in reference to a stitch formation device in order to perform sewing stitches at predetermined target positions, and at least one sensor ( 29 ,  43 ,  44 ) for determining oscillations of at least one of the article to be sewn ( 11 ) or the material holding device ( 13 ).  
   
   
       6 . A device according to  claim 5 , wherein the at least one sensor ( 29 ,  43 ,  44 ) is an optic sensor ( 29 ) with a light source ( 33 ) and an image sensor ( 39 ), with the image sensor ( 39 ) being able to detect at least two spatial dimensions for resolution.  
   
   
       7 . A device according to  claim 5 , wherein the at least one sensor ( 29 ,  43 ,  44 ) comprises at least one of a pressure sensor, a force sensor, a torque sensor ( 43 ) or an acceleration sensor ( 44 ).  
   
   
       8 . A device according to  claim 7 , wherein the at least one sensor ( 29 ,  43 ,  44 ) comprises a pressure, force, or torque sensor ( 43 ) arranged in a connection area of the material holding device ( 13 ) to the driving device ( 18 ).  
   
   
       9 . A device according to  claim 7 , wherein the at least one sensor ( 29 ,  43 ,  44 ) comprises an acceleration sensor ( 44 ) arranged at the material holding device ( 13 ), located at a distance from a fastening device ( 15 ) for attaching the material holding device ( 13 ) to the driving device.  
   
   
       10 . A device according to  claim 5 , wherein an adaptive control ( 51 ) is provided for controlling a motor or motors (M) of the driving device.