Patent GB-710854-A (GB)
Title: Improvements in and relating to labelling and like machines
IPC: B31B19/00
Filed: 1950-10-09
Abstract: 710,854. Labelling - machines &c. GAMBLE, H. Oct. 8, 1951 [Oct. 9, 1950], No. 24567/50. Class 73 [Also in Group XVI] In a machine for affixing labels or transparent strips to blanks or envelopes, e.g. applying transparent film to cover punched out openings in envelope blanks, the blanks 1 are separated one at a time from a magazine 2 by an oscillating sucker 5 and an oscillating arcuate plate 11, 13 provided with a gripper jaw 13 (see Group XVI), and separation is completed by a pair of feed rollers 3, 24 which feed the blanks to the bite of a gumming-roller 21 and a small pivotally mounted roller 35. A metal or rubber pad 34 on the roller 21 is shaped to' suit the outline of the opening in the blank 1, and adhesive is applied thereto by a roller 41 which receives adhesive from a roller 38, in a bath 37, bv means of an adjustable intermediate roller 39. The shaft 42 of the roller 21 is adjustably mounted in eccentric bearings. After the application of adhesive thereto, the blank 1 is fed by rollers 45. 46 to strip- or labelapplying position. The label or trans-. parent film material is fed bv two rollers 50. 51, from a reel 49, the roller 51 being driven intermittently through a ratchetmechanism mounted on a gear-wheel 85 in mesh with a toothed sector 86 pivoted at 87. The sector 86 is oscillated by a cam rod 88 having a roller 89 thereon engaging a cam 90 fixed to a roller 65. The label &c. strip is fed between a pair of shearlike cutters 52, 53 and a clamp 54, and the cut-off strips are gripped on the roller 65 by suction and conveyed to the gummed blank which is fed between the roller 65 and a support roller 68. The labelled blanks then pass between a pair of accelerating rollers 80, 81 which deliver them in overlapped formation on to a slowly moving conveyer belt 82. The label &c. web passes around a floating roller 70 which controls an adjustable spring brake band 71, engaging a pulley 72 on the reel helder 73, thus maintaining a substantially constant web tension. The cutter 52 is reciprocated by a lever 59, pivoted at 60, and rocked by a lever 61 operated by a cam rod 62 having a roller 63 engaging a cam 64 secured to the shaft of the roller 65. The cutter is fixed to a bracket 67 pivoted to a link 92 and engaged by a forked lever 83 which is oscillated by the lever 59. Safety or detector devices are incorporated. For example, the small roller 35 is prevented from engaging thegumming-roller 21 if a blank has not been fed, so that it cannot be coated with gum. This roller is carried by a lever pivoted at 97, and oscillated by a cam against the action of a spring. A moving blank is adapted to swing a finger 101 which controls the swinging movement of the roller 35. The movement of the finger 101 abut its pivot 100 operates a lever 102 which is. coupled by a long push rod 103 to a pawl 104 which can engage a notch 106 in the cam rod 62 which operates the cutter 52: so that a strip or label is not cut from theweb if a blank is not fed past the finger 101. Further, when the cutter does not operate, the toothed sector 86, which operates the feed roller 51, is prevented from making a feeding stroke: A rod 95, operated from the cam rod 62, controls a spring loaded pawl 91 in the drive of the toothed sector, so that if the cutter is not operated, thestrip is not fed.