Patent GB-860092-A (GB)
Title: Multiple-band power hone
IPC: B24B3/58
Filed: 1959-04-13
Abstract: 860,092. Sharpening slicer-bands in situ. HANSEN, J. April 13, 1959 [Oct. 3, 1958], No. 12485/59. Class 60. In a honing apparatus for a bread-slicing machine shown diagrammatically in Fig. 5 in which a plurality of endless slicer bands 32 are trained over substantially parallel drums 28, 30, the honing means 46, Fig. 2, are disposed adjacent to the bands and are adapted to be moved into engagement with, and to be reciprocated crosswise of, the bands. The upper and lower bights of the bands 38, 40, are engaged by hones 42, 44, respectively, so that the upper and lower face of each band is honed, the honing area 36 being between the slicing zone 34 and the upper drum 28. The hones, which each span all the slicer bands, are mounted at the ends of rocking arms 98, 100, Figs. 2 and 3, rigidly secured at their inner ends to tubular members 94, 96, Fig. 4, carried transversely of the frame slides 24, 26 and 20, 22, by rods 62, 64 on which the members 94, 96 are journalled at 90, 92 to allow of lateral sliding and rotary movement, the ends of the rods being supported by sub-frame elements 76, 84, 68, 70 and 58, 60, the latter supports forming extensions of a gear housing 48 which is itself supported from the main frame members 24, 26 by brackets 54, 56. The sub-frame portion 66 attached to the frame members 22, 24 is readily detachable to facilitate removal of the slicing bands. An electric motor 134, Fig. 2, with built-in speed reduction, drives, through chain and sprockets 138, 132, a shaft 128 journalled in the cover 116 of the gear-box 48, the shaft bearing 118 being surrounded by a sleeve 120 keyed to the drive shaft 128, the sprocket end of which carries a pinion 154 which, with wheels 150, 156 and pinion 152, Fig. 9, provides a double-reduction drive to a cam-shaft 140, Fig. 4, also journalled in the gear box elements 48, 116. Reciprocation of the hones is effected by a carriage 114 mounted on the sleeve 120 and having opposed pins 124 which engage a cam-groove 122 on the sleeve. the carriage 114 having extending arms with forked ends 110, 112 which engage with collars 106, 108, provided at the ends of the rockable, sliding tubular members 94, 96. The hones are disengaged from the bands after a pre-deter. mined number of lateral movements, and the drive discontinued during the period of disengagement, by a cam 142 the lobe 144 of which engages a follower 192 attached to a double link 166 connecting the upper and lower rockable hone-carrying arms 98, 100 via arms 162, 164 rigidly connected to the collars 106, 108. As the cam shaft 140 makes one revolution after a number of reciprocations of the carriage 114, depending on the ratios of the reduction gears, the cam 142 having a width sufficient to retain contact during reciprocation causes the hones to be lifted after the required number of honing strokes. The cam-shaft 140 is provided with a keyway wider than the key itself 200, Fig. 11, to provide a degree of angular adjustment of the cam relative to the shaft so that, after reversing the bands, the honing action shall again take place toward the scalloped cutting edges of the bands. This adjustment is effected manually and the cam is secured on its shaft in either of the two angular positions by a nut 202. An actuator 194 on the link 166 may be used to trip a switch 196 to cut off current to the driving motor 134. A spring 158, which is attached at one end to the arm 162 and, by adjusting means 170, to the link 166 is anchored to a lug 160 secured to the forked end 112 of the carriage 114. This spring restores and maintains contact between the hones and bands, tension being adjustable by a knurled screw head 172 which also enables the relative angular relationship between the rocking arms 98, 100, to be adjusted, the link 166 being slotted to permit relative movement between it and the upper end of the arm 162. A lug 190, Fig. 3, is secured to the forked end 110 of the carriage 114 to enable the member 160 to be transferred to that end for reversal of the linkage as when, on certain machines, the gear housing 48 is mounted at the opposite side of the machine. The lift of the cam 142, the follower 192, and the linkage between the rocking arms are so adjusted that when the hones wear the follower " bottoms " on the minimum radius of the cam before the hone-holders 102, 104, can contact the slicing bands. The hones may, in a modified form of the apparatus, be located beneath the band portions 28, 40 and pressed upwardly.