content_image/606224.jpg content_image/606226.jpg content_image/606225.jpg
<img src='content_image/606224.jpg'>

<img src='content_image/606226.jpg'>

complete revolutions to complete one stitch. The oscillating models are generally slower in operation while the rotary is the high-speed model. Aside from the larger, heavy-duty machines, most new machines are rotary in operation. [Figures 6-74 and 6-75] 

<img src='content_image/606225.jpg'>

There are three types of feed mechanisms to move material through the machines. The first and simplest is called a “drop feed” machine. With this type of feed, a feed dog on the bottom rises up to press the material against the presser foot from the top and moves it along while the needle bar 

