which extends obliquely downward from one of the roll supporting plates 164 so that the rod can move parallelly to and turn relative to arm 171 an air cylinder 174 swingably connected to connecting rod 173 and brackets 175 pivotally supporting air cylinder 174 to permit upward downward and swinging motions of the cylinder operation of this separate paper bag supporting section d is as follows each paper bag placed on conveyor 130 by the bag puller section c is conveyed past horizontal plate 169 of guide plate 170 onto the turnable rods 166 167 next air cylinder 155 is actuated to turn base plate 152 together with rods 166 167 etc about pin 151 up to a point on the extension line from central trough g 303 the two rods 166 167 thus brought to a stop are longitudinally inclined and the paper bag thereon will slip downward unless they are pressed in position in order to avoid the fall and open the paper bag a section e for holding and opening the bag is provided the section e which functions in cooperation with lower bag opening member 15 comprises as shown in fig1 14 and 15 an upper bag opening member 201 an inverted l shaped plate 202 which serves as a frame for suspending upper member 201 a suitable number of long bolts 205 piercing through the horizontal part 203 of suspending plate 202 and fastened to upper member 201 tension springs 208 which surround the long bolts between the upper surface 206 of upper bag opening member 201 and the under surface 207 of horizontal plate part 203.