Linear conveying unit

A linear conveying unit comprising:

• a linear rail forming first and second pairs of longitudinal tracks disposed on first and second opposing sides of said rail, respectively;
• said tracks of said first pair of tracks forming a first angle therebetween and converging toward said second side of said rail;
• said tracks of said second pair of tracks forming a second angle therebetween and converging toward said first side of said rail;
• said first and second angles being substantially equal to one another;
• a saddle mounted for movement along said rail and including front and rear groups of wheels, each group of wheels comprising first and second pairs of wheels disposed on said first and second sides of said rail, respectively;
• said wheels of said first pair of wheels being rotatable on respective axles which form a third angle between one another and which converge toward said second side of said rail;
• said wheels of said second pair of wheels being rotatable on respective axles which form a fourth angle between one another and which converge toward said first side of said rail;
• said second and third angles being substantially equal to one another and to said first and second angles;
• and
• drive means for moving said saddle along said rail;
• only one wheel of each of said front and rear groups of wheels being adjustable radially for eliminating gaps between said wheels and said tracks.