Patent GB-681569-A (GB)
Title: Improvements in or relating to machine for preparing container blanks
IPC: B31C9/00
Filed: 1950-03-29
Abstract: Bottle-shaped paper containers made from paired rectangular and arcuate blanks a, b. Fig. 1, are prepared in a machine comprising two adjacently arranged and synchronously operated machine divisions, (see Group XVII), which include glueing apparatus whereby glue is applied to the rear portion r of the upper surface of the blank a, while the arcuate blank b receives glue over its rearward portion t and along the remaining portion t11 of its outer arcuate edge.  The apparatus for glueing the portion r of the rectangular blanks comprises a glue container 151, Fig. 9, with a bottom nozzle 152 through which glue issues into a pocket defined by a pair of adjacent rollers 153, 154, Fig. 23, located within a box-like structure mounted on a table plate 61 over which the blanks are fed, the end walls 158 of the box being recessed to provide a passage for the blanks.  The shafts of the glueing rollers 153, 154 are journalled in the side walls of the box, the shaft 161 of roller 153 being carried in end sleeves which are mounted eccentrically within rotatable collars, so that the thickness of the glue film can be varied by rotating either or both collars to adjust the <PICT:0681569/III/1> <PICT:0681569/III/2> <PICT:0681569/III/3> <PICT:0681569/III/4> <PICT:0681569/III/5> distance between the glueing rollers.  An adjusting knob 176, Fig. 24 (not shown), is mounted adjacent to one end of the shaft 161 and arranged to be coupled to a gear train in such manner that normally the rotation of the knob adjusts both end bearings simultaneously; alternatively, by pulling the knob outwardly prior to rotating it, one end only of the roller 153 is adjusted, the other end being adjustable by pushing the knob inwardly before rotation.  In order that glue shall be applied over the rearward half only of the strip a, a roller 180, Fig. 20, is located beneath an aperture 6111 in the plate 61 and raised at intervals to press a blank into contact with the glueing roller 153, means being provided to retain the roller 180 against movement when there is no blank in position for glueing.  The roller-retaining means is controlled by a feeler 210 which drops into the aperture 6111 when a blank is absent, and breaks the circuit of a solenoid controlling an air-admission valve associated with a piston connected to a link 226, the normal operative position of the piston being such that the link 226 holds the lower end of a lever 191 in the path of the rocking-lever 195. The upper end of the lever 191 is connected to a rod 190 bridging one end of a pair of pivoted levers 184 between which roller 180 is mounted.  When there is no blank above the aperture 6111 the link 226 is operated to withdraw the lever 191 from abutment with the end of the rocking lever 195.  The glueing apparatus for the arcuate blanks b comprises a pair of parallel rollers 561, 562, Fig. 47, mounted between the side plates of a U-shaped frame that can be lifted vertically from its normal position in which the roller 561 rotates in contact with the surface of a substantially arcuate glueing-roller 541 mounted below it.  End plates pressed resiliently against the ends of the rollers 561, 562 define, together with the peripheral surfaces of the rollers, a pocket into which glue g is fed through a nozzle 564, the thickness of the glue transferred by roller 561 being varied by mounting the roller shaft in eccentric end bearings, as in the glueing apparatus for the rectangular blanks.  A presser roller 555 disposed below a slot in the blank-supporting table 505 presses the blanks against the surface of the roller 541 which, as shown in Fig. 51, has a semi-circular glue-applying surface 550 of a contour corresponding with the shape of the glue-patch required on the upper surface of the arcuate blank, and a flange 551 at one end with a rim 552 shaped to apply a stripe of glue along the edge t11, Fig. 1.  In the event of an interruption in the feed of the arcuate blanks a pair of pivoted feelers 600, 601 spaced apart along the line of feed operate means which lifts the glue-transferring roller 561 out of contact with the arcuate roller 541.  The feelers are connected in parallel so that either or both will control the switching of a solenoid which operates the admission valve of a compressed air cylinder 617 containing a piston 618.  A horizontal rod 622, connected between a pair of arms 623 mounted on a shaft 624, is held upon the upper end of the piston rod 619 by a tensioned spring 629, so that movement of the piston is transmitted through a cross-bar 628 to a pair of vertically slidable rods 633 with their uper ends in abutment with the lower edges of the frame carrying the rollers 561,562.  Under normal feed conditions, with the feelers held in their upper position by the blanks passing thereunder, the solenoid is maintained energized and the vertical rods 633 remain in their lower position.