Patent Publication Number: US-2019169773-A1

Title: Cloth Pressing Device Of A Sewing Machine

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority from Taiwan Patent Application No. 106218127, filed Dec. 6, 2017, the disclosure of which is hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a device of a sewing machine, and more particularly to a cloth pressing device of a sewing machine. 
     2. Description of Related Art 
     With reference to  FIG. 7 , a conventional sewing machine  80  has a pressing leg  81  and a pressing rod  82 . The pressing leg  81  is mounted around a bottom portion of the pressing rod  82 . The purpose of the pressing leg  81  is to press a fabric smoothly on a plate of the sewing machine  80 . A user may tailor a specific thread pattern according to a shape of the pressing leg  81  or with the aid of a tailor board. 
     The pressing leg  81  is mounted around the bottom portion of the pressing rod  82 , and the pressing leg  81  is a one-piece structure. The user must unfasten and detach a screw from the pressing leg  81  in the process of replacing the pressing leg  81 . However, the space under the pressing rod  82  is narrow. Therefore, the pressing rod  82  must be moved in the process of replacing the pressing leg  81 , which is very inconvenient in operation. 
     SUMMARY OF THE INVENTION 
     The main objective of the present invention is to provide a cloth pressing device of a sewing machine. 
     The cloth pressing device of a sewing machine has a presser leg and a presser foot. The presser leg is a hollow cylinder and has a combining portion and a sleeve portion. The sleeve portion is integrated with a bottom portion of the combining portion. The presser foot is mounted around and fixed with a bottom portion of the presser leg. The presser foot has a surrounding portion and a pressing portion. The surrounding portion is a U-shaped block and has a front end and two free ends. The pressing portion is formed at the front end of the surrounding portion. 
     Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view of a first embodiment of a cloth pressing device in accordance with the present invention mounted at a sewing machine; 
         FIG. 2  is a perspective view of the cloth pressing device in  FIG. 1 ; 
         FIG. 3  is an exploded perspective view of the cloth pressing device in  FIG. 1 ; 
         FIG. 4  is a perspective view of a presser foot of the cloth pressing device in  FIG. 1 ; 
         FIG. 5  is a perspective view of a presser foot of a second embodiment of a cloth pressing device in accordance with the present invention; 
         FIG. 6  is a perspective view of a presser foot of a third embodiment of a cloth pressing device in accordance with the present invention; and 
         FIG. 7  is a front view of a pressing cloth device of a conventional sewing machine. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT 
     With reference to  FIGS. 1 to 4 , a first embodiment of a cloth pressing device of a sewing machine in accordance with the present invention comprises a presser leg  10  and a presser foot  20 . 
     The presser leg  10  is mounted around and fixed with a sewing machine  30 . The sewing machine  30  has a pressing rod  31 . The pressing rod  31  is a solid cylinder and has a mounting hole  311 . The mounting hole  311  is transversely formed through the pressing rod  31  and is adjacent to a top surface of the pressing rod  31 . Therefore, the presser leg  10  may be mounted around and fixed with the pressing rod  31  of the sewing machine  30 . 
     The presser leg  10  is a hollow cylinder and has a combining portion  11  and a sleeve portion  12 . The combining portion  11  has a combining hole  111  transversely formed through the combining portion  11 . A screw is mounted through the combining hole  111  and the mounting hole  311  to make the presser leg  10  mounted around and fixed with the pressing rod  31  of the sewing machine  30 . The sleeve portion  12  is integrated with a bottom portion of the combining portion  11 . An outer diameter of the sleeve portion  12  is smaller than an outer diameter of the combining portion  11 . 
     The presser foot  20  is mounted around and fixed with a bottom portion of the presser leg  10 . The presser foot  20  has a surrounding portion  21  and a pressing portion  22 . The surrounding portion  21  is a U-shaped block and has a front end  211 , two free ends  212 , a through hole  213 , and a fastening hole  214 . The through hole  213  is vertically formed through the surrounding portion  21  and between the front end  211  and the two free ends  212 . The fastening hole  214  is transversely formed through the two free ends  212  of the surrounding portion  21 . A screw  215  is mounted through the fastening hole  214  with a nut  216 , and an inner diameter of the through hole  213  is adjustable. 
     The pressing portion  22  is formed at the front end  211  of the surrounding portion  21  and has a connecting section  221  and a model block  222 . The connecting section  221  is formed at the front end  211  of the surrounding portion  21  and is an oblique block. The model block  222  is formed at a bottom portion of the connecting section  221 . Preferably, the model block  222  is a circular ring and has a recess  2221 . The recess  2221  is formed in a top surface of the model block  222 . 
     When the first embodiment of the cloth pressing device in accordance with the present invention is in use, a user must loosen the screw  215  and the nut  216 . Then, the user may replace the presser foot  20  rapidly and conveniently. For replacement of the pressing leg  81  of the conventional sewing machine, which has a narrow space under the pressing rod  82 , the pressing rod  82  must be moved before the replacement, while the present invention is rapid in replacement of the presser foot  20  and hence is convenient in operation. 
     With reference to  FIG. 5 , a second embodiment of a cloth pressing device in accordance with the present invention is substantially the same as the first embodiment except for the following features. The model block  222 A is a circular ring and has a positioning hole  2221 A. The positioning hole  2221 A is vertically formed through the model block  222 A and is away from the connecting section  221 A. 
     With reference to  FIG. 6 , a third embodiment of a cloth pressing device in accordance with the present invention is substantially the same as the first embodiment except for the following features. The model block  222 B is a semicircular sphere and has a receiving hole  2221 B. The receiving hole  2221 B is vertically formed through a top surface of the model block  222 B. 
     Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.