respectively in fig4 when in the weave tilt position the controls are exposed to an operator when facing the loom so that successive weaving operations may be performed when in the warp transfer tilt position the warp arrays are in the line of vision of the operator facilitating circulation of the warp threads by indexing the warp arrays in one direction or the other and by transfer of a warp thread from one array to the other the entire operating mechanism of the loom with the exception of a fabric roll 48 which is journaled in the arms 4 is supported by the frame 1 while the parts making up the mechanism are identified in fig1 4 reference should be made to fig5 in the following the description as this fig illustrates what may be termed a transverse schematic cross section of the loom mechanism with some parts displaced from true position for clarity in this fig conventional ground markings should be interpreted to mean the essential points of support of the mechanism in the frame 1 supported by the frame 1 are bearings 12 and 14 on which are slidably supported at one end a front cross member 16 and a rear cross member 18 which may be supported at their opposite ends by similar bearings mounted on the frame 1 or by other means such as rollers guided in suitable ways not shown in the frame 1 the cross members 16 and 18 are simultaneously moved toward and away from each other to predetermine limits by rotation of a knob 20 operably connected.