Patent GB-691945-A (GB)
Title: Improvements in an apparatus for applying adhesive to carton blanks
Inventor: PALMER CHARLES EDWARD
IPC: B31B50/62
Filed: 1951-01-03
Abstract: <PICT:0691945/III/1> <PICT:0691945/III/2> <PICT:0691945/III/3> <PICT:0691945/III/4> An apparatus for printing adhesive on a selected area on one side of a carton blank, comprises a supporting frame, a carton blank supporting plate having an opening exposing the area of the carton blank, a platen disposed above the plate so as to allow a carton blank to be inserted in between the plate and platen, an adhesive container below the plate, a member vertically reciprocable within this container, a printing pad on this member arranged to register with the plate opening, mechanism for reciprocating the member to alternatively immerse the pad in the adhesive and to bring the pad into printing contact with the carton blank and means for delivering the carton blank into and discharging it from the printing position.  Referring to the drawings, a stack of carton blanks 20 of the shape shown in Fig. 1, is placed in magazine 111 with the tabs 27 rearwardly disposed.  Lever 214 is then moved throwing in a clutch which rotates shaft 178 carrying a series of cams.  The first cam 182 lifts rocker arms 120 and hence moves suction cups 115 into contact with the lowermost carton blank in magazine 111, while consequential elevation of arm 132 brings recess 136 into registration with apertures 137 and 138 thus connecting vacuum line 118 to cups 115 so causing carton blank 20 to adhere to cups 115.  Further rotation of cam 182 retracts arm 116 bringing down the blank on to guide bars the vacuum being held by pin 139 in grooves 140 until arm 133 contacts nuts 142 so moving valve 130, breaking the vacuum and admitting air to tbe cups via line 128.  Cam 183 then comes into operation moving forward bar 97 under the action of rocker arm 99, a shoulder on bar 97 pushing between tabs 27 to move the blank forward between platen 38 and plate 37.  The bar 97 near its forward limit retracts a lever so switching off current to solenoid 47 and allowing spring 49 to move armature 48 into the path of the approaching carton blank and so limiting its forward travel.  As bar 97 retracts, cam 181 moves cross-bar 55 upwards so raising printing pads 41 up through openings 40 in plate 37 to coat with adhesive selected areas of carton blank 20.  When a blank is in position between plate 37 and platen 38 it is interposed between the hooked end 89 or rod 83 and the end 87 of rod 82, so that no contact is possible between these two.  When, however, no carton blank is in this position then as cross-bar 55 moves, flange 88 contact bushing 94 so causing hook 89 to contact and lift switch rod 82 which energizes solenoid 76.  This moves finger 78 turning collar 71 on to collar 70 when rachet teeth 72 slightly lift collar 71 sufficiently to cause collar 71 to contact collar 74 as cross-bar 55 is at the crest of its stroke and so to lift platen 38 out of contact with the adhesive appplying member. As the cams 181 return the cross-bar 55 to its lowermost position cam 184 moves connecting bar 203 and arm 169 against the action of spring 173 so causing revolving rack 145 to rotate and bring a pair of aligned apertures 149 into horizontal registration with the space between plate 37 and platen 38 while belt conveyer 146 is also set in motion moving shelves 157 into registration with transfer shoot 155 and discharge shoot 164.