![]() ![]() Singer clarifies by further grouping these patterns into primary patterns and combination patterns. It is important to note that both cam fingers are in play simultaneously to create a variety of patterns. These settings control two cam fingers that ride on two columns to the left of the internal cam stack. Twenty three type B cams were produced, but the last, a basting stitch cam, only works with the Touch & Sew models. Earlier models, were of the single cam variety, while later models included 'flexi-stitch' patterns which is a fancy name for double cam. The 400, 500, 600 and 700 series machines use the type B, black, top hat, external cams which load directly into the top of the machine. These are fitted to specific classes of machine models. Singer's external cams were made of bakelite and are called Fashion Discs. These cams are used to produce a variety of functional stitches and decorative patterns. ![]() ![]() The 500a is not only zigzag capable, but both externally and internally cam driven. There is still only one upper tensioner and bobbin thread though, so don't go too wild! The advantages of this configuration are numerous, as it allows you to mix and match different needle sizes for mixing types of thread. Speaking of twin needles, the 500a is double needle capable-meaning you can load two single needles side by side for twin needle sewing. ![]()
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