Patent GB-794964-A (GB)
Abstract: 794,964. Feeding webs; delivery apparatus; accounting and like machines. NATIONAL CASH REGISTER CO. Sept. 26, 1956 [Sept. 30, 1955], No. 29348/56. Classes 100(1) and 100(4) Apparatus for feeding a preprinted paper strip through successive identical increments of movement, the paper strip being provided with spaced apertures corresponding to such increments, includes a feed roller and a co-operating pressure roller adapted to feed the paper strip forwardly through a distance in excess of one increment during an initial portion of the operation of the apparatus, a reverse feed stop, and a reverse feeding mechanism rendered operative following the forward feed of the paper strip to impart a reverse rotation to the pressure roller to effect retraction of the paper strip until the latter is arrested by the engagement of the reverse feed stop with the first aperture presented thereto. Feeding webs. As shown, strip material 29, Fig .6, to be cut into labels or receipts, for issue from a cash register or like machine, is fed from a supply roll upwardly to a guide shoot 30, Fig. 1, between serrated feed flanges of a printing cylinder 20 and a pressure roller 31, through a shoot 33 to a knife 32 which cuts the strip transversely, past type wheels, not shown, cooperating with a hammer 34, through rollers 35, 36 which eject cut labels, and past a stamp key 43. The strip is registered in correct position for printing and cutting, in relation to matter already printed on the strip, by a feed stop 50 which engages apertures 49, Fig. 10, in the strip 29. The stop 50, Fig. 1, has an upwardly curved end portion to permit upward strip feed without interference and is secured between an arm 51 and block 52. The arm 51 has studs 53 which co-operate with slots 54 in a member 55 rotatably mounted on a shaft 56, the arm 51 being urged upwardly by a spring 59. A stud, not shown, extends from the arm 51, in the opposite direction to the studs 53, into engagement with a pitman 63, Fig. 3, not shown, that is moved downwardly upon rotation of a cam 72, Fig. 3, .not shown, thus moving the stop 50, Fig. 1, in the oppoite direction to normal strip feed. The cam 72, Fig. 3, not shown, is so timed that the downward movement of the pitman 63 and stop 50, Fig. 1, occurs during actuation of the knife 32. An upward feed of the strip 29 is followed by a slight downward feed imparted to the strip by counterclockwise rotation of the pressure roller 31 actuated by a pitman 80, Fig. 8, carrying a friction pad 81 which contacts the roller 31 during its upward movement. The pitman 80 is urged into engagement with the roller 31 by a spring 82. A link 85 pivoted to the lower end of the pitman 80 is connected to a lever 88 carrying a roller 90 urged into contact with a cam 92 by a spring 91. Rotation of the cam 92 causes upward and downward movement of the pitman 80. The pitman 80 is tripped out of engagement with the roller 31 by a stud 94 on arm 95 which engages a surface 93 on the pitman 80. The arm 95 is formed on a yoke 96, freely mounted on a fixed shaft 102, which has an arm 97 carrying a roller 98 urged by a spring 99 into contact with a cam 100 secured to a cam shaft 22. When a shoulder 101 on the cam 100 has passed the roller 98 the arms 95, 97 can be rotated clockwise by the spring 99 to disengage the stud 94 from the surface 93, thereby rendering the pitman 80 effective to rotate the roller 31 and so effect downward feeding of the strip 29, Fig. 10, until an aperture 49 engages the feed stop 50, Fig. 1, to register the strip for printing and severing. The strip 29, Fig. 6, is unwound from a core 195 composed of compressed paper which fits on a sleeve 196 rotatable on a stud 197. A spring, not shown, wound around the stud 197 and engaging an enlarged portion of the bore of the sleeve 196 prevents overrunning of the supply roll. A sensing roller 199 engaging the periphery of the supply roll is rotatably mounted on an arm 201 secured to a lever 202 rotatable on a stud 204. A spring 205 urges the arm clockwise to maintain the roller 199 in contact with the supply roll. A stud 206 on the lever 202 co-acts with a surface 207 on a control arm 208 secured by a hub 209 to a lever 210. The surface 207 is formed by a pawl 212 freely mounted on the arm 208 and urged counterclockwise by a spring 213. A predetermined reduction in supply roll in diameter causes clockwise rotation of the lever 202 thus causing the stud 206 to ride down the surface 207 towards a shoulder 215, thus releasing the arms 208 and 210 which then rock clockwise until a surface 217 on the arm 208 contacts the stud 206. An ear 218 on the lever 210 engages an under-cut surface 219 on a clutch control lever 17 and thereby prevents further actuation of the machine. The core 195 is removed from the sleeve 196 to permit insertion of a fresh supply roll by first rocking the arm 201 counterclockwise, such that the stud 206 engages a depression, whereby the spring 216 rocks the lever 210 and arm clockwise and so moves the ear 218 into the path of the surface 219 to prevent release of the lever 17. The lever 202 and 201 are maintained in their inoperative positions to permit withdrawal of the exhausted core 195 by engagement of the stud 206 with a depression in the surface 207, the stud 206 being disengaged by actuation of an extension 221 of the lever 210. To facilitate insertion of a new strip the rollers 31 and 36, Fig. 1, and the stop 50 may be moved to inoperative positions a lever, not shown, on the shaft 56 is tripped manually. Label delivery; label cutting. The knife 32, Fig. 1, is secured to a support 110 rotatably mounted on a shaft 111 carrying a knife arm 112. The support 110 and arm 112 may be adjusted relatively to one another by an eccentric connection 113 locked by a bolt 114. An arm 115 secured to the shaft 111 carries a roller, not shown, which is actuated by a cam, not shown, on a shaft 116 to rock the knife 32 towards and away from a stationary knife blade 117. Cut labels are delivered upwardly by two pairs of rollers 35, 36 out of a shoot 38. The rollers 36 are secured to a shaft 121 supported in arms 122 pivoted on a shaft 123, the rollers 36 being urged into engagement with the rollers 35 by a spring 124 wrapped around the shaft 123. One end of the spring 124 bears against a gear segment 125 and the other against a roller 126 on arm 127 secured to the arm 122. At the commencement of each cycle of operation of the machine, a cam 128 rocks the arm 122 through an arm 130, to separate the rollers 35, 36. When strip 29 has been fed between the rollers 35, 36 and just before actuation of the knife 32, the cam 128 allows rollers 35, 36 to engage. After actuation of the knife, the rollers 35, 36 are rotated counterclockwise to deliver the cut label from the shoot 38. A pinion 137 secured to the shaft 121 meshes with a pinion 138 secured to a pinion 139 both free on the shaft 118. The pinion 139 meshes with the segment 125 rotatable on a sleeve 140. Rotation of a cam 144 secured to the cam 128 rocks a segment 142 meshing with a segment 141 integral with the segment 125 to cause rotation of the rollers 35, 36. A light spring finger, not shown, located in the shoot 38 retains a cut label in a position from where it may be removed by an operator.