power line across which the motor 20 is  directly connected with interposition of a push button switch 92 located, as shown in Figs.  1,  3 and  5, on  the frame 1 in  convenient  reach  of  an attendant stationed at the loading end of the machine. As shown in  Fig.  16,  the power main 90 extends to the  setting  arm of a selector  switch  94 having the con tacts  H,  L and HL, and  the  conductor 91  extends  to relays  93 and 193 which, respectively, are controlled by impulses  from  photo  electric  eyes  46  and  140  trans mitted through connecting conductors 95,  96 and 97, 98 respectively.  The power leads 99 and 10th  for the relay 93 are connected respectively to  the contacts L  and HL of the  selector  switch 94,  and the  power leads  101 and 102 for the  relay  193  are  connected to  the  contacts  H and HL of the  selector  switch 94.  Leads 105 and 106 from the  relay 93 are  connected to  the remote ends of the axially aligned coils  47a and  47b of the magnetically actuated valve 47  for the cylinder 44, the switch 75 being interposed  in  the  conductor  106.  Leads  108  and 109 from the relay 193 are similarly connected to the remote ends  of  the  coils  147a  and  14712  of  the  magnetically actuated valve 147 for the cylinder  144, the opposite or contiguous ends of said  coils  being connected by a con‘ ductor 111 to the contiguous ends of the coils  47a and 47b of the valve 47, and the switch 175 being interposed in the conductor 109. Connected  across  the  mains  90  and  91,  with inter position of a manually operable switch 115,  is  the pri mar'y  of  a  transformer» 116 by which the  E.  M. F.  is reduced, say to  eight volts for use in actuating the mag netic valves 47 and 147 which control the photo  electric eye  shifting cylinders 44  and  144,  ‘and the  magnetic  valves 62 and 162 which control the  slide  retracting cylinders 55 and 155,  said  switch 115 being located  adjacent the switch  94 at  the loading end of the  machine as  shown in Fig.  3.  Through conductors 107 and 110,  the leads 106 and 108 are  connected to the conductor 118, while a  conductor  111 in  continuation  of  the ‘conductor  119 extends  to the common terminals of the  coils  47a,  47b and 147a,  147b of the  valves  47 and 147 respectively. The coils  of the  magnetic valves  62  are in  series  with the  respectively  corresponding  switches  Ll-L4 through conductors 117 and connected by a branch 120 of con ductor 119 in parallel across the conductors 118 and 119 leading from the secondary of the transformer 116.  The coils  of  the  magnetic valves  162 for the  cylinders  155 are likewise in series  with the respectively corresponding switches  Hl-H3 through conductors 124 and connected in  parallel  between conductors 1118  and 119.  A  manu~ ally-operable gang switch  conventionally indicated at 125 is  provided with metallic segments which, under certain conditions later on described,  are ‘adapted  to bridge the terminal  contacts  of  pairs  of conductors  126 and  127 which extend from the ?xed terminals  of corresponding pairs of  switches  of  the  groups  L  and  H.  . Operation To prepare  the  machine for  the  sorting  of  stockings in  accordance with both differences  in  length  and with differences  in reinforced heel height,  the  selector switch 94  is  shifted  to  the  HL  position,  the  gang switch  125 is  set in open position,  and the switches 92 and 115 are closed—all  as  shown in  Fig.  17.  With the  motor 2%) now  running, the conveyer is  moved  at a  moderate  linear speed,  and,  as  each tray  assumes a horizontal position after  rounding the sprockets 3,  a stocking is  taken from the pile P and laid flat upon the tray transversely of the machine in  a de?nite position  determined by lodgment of its  heel  in  the  stop  30 of the  tray  as  previously ex plained.  As the  tray  passes  beneath  the  sensing  eyes 411  and 140, the pivot lug 25 at one side of the tray en counters the arm  77  of  the switch 75  and closes the latter, and the  heel  stop  31)  on the  tray  encounters  the  arm 177  of  the  switch 175 to close  the  latter. quence, the coils  47a and 147a of the  magnetic valves 47  and 147  are  energized for admission of compressed air  into  the  cylinders  44  and  144,  whereby the  photo electric  eyes  40 and 41  are  moved inward of the  ma chine from the normal retracted positions in which they are  shown in  Figs.  13  and  15.  By affectation  of  the beams B and B1 from the eyes 46 ‘and  140 respectively in  encountering the  top  edge of the  stocking S and the top edge of its  heel reinforcement H, current is  supplied to the coils 47b and 14712 of  the valves 47 and 147  which latter  are  thereby actuated for admission of air into the opposite ends of the ‘cylinders  44 and 144 for return of the  eyes  to  their  normal  retracted  positions.  During the  inward movements of the  eyes  40 and 140 as  just explained, the upstanding stud 33 of the slide  32 on the tray  is  shifted  along its  guideway by the projection  48 on the  carriage  42  to  a position  in  line  with the  top edge  of  the  stocking  as  shown in  Fig.  12,  and the up standing  stud  133 of  the  slide  132  is  shifted  along its guideway by the  projection  148 on the  carriage  142 to a position in  line with the top of the heel reinforcement as  shown in  Fig.  14.  Assume that,  by the  particular stocking  referred  to,  the  studs  33 ‘and  133 on the sup— porting tray were positioned to  actuate the ?rst pair of switches L1 and H1  in the  direction of conveyor travel as in Fig.  17 and that the coils of the valves 62 and 162 are thereby energized  to  open said  valves for actuation of  the  corresponding  cylinders  55  and  155  and with drawal of the corresponding slides 53 and 153 from  the As a conse- 6 corresponding voids 52 and 152 in the  rails 22 and 122. Thus, as the tray continues in its  advance, it is released to  swing  downward about  the  pivots  26a at  its  front edge  upon  arrival  of  the  lugs  29a  at  its  rear  edge  at said voids and to drop the stocking into the ?rst recep tacle  R1.  In this  connection it  is  to be noted that  in Fig.  16,  the  switches  L1-L4 and the  switches H1-H3 are arranged for the sorting of stockings of four  different lengths  and three  different  heel  heights.  Thus in Fig. 16,  the  switches  Ll-L4 will  be  actuated by the  studs 33  when the  latter  are  shifted  to  the positions  a-d re spectively,  while  the  switches  袜子分拣机英文文献和中文翻译(3):http://www.youerw.com/fanyi/lunwen_27347.html