Patent GB-112657-A (GB)
Title: Improvements in Apparatus for Operating the Feed Devices of Planing Machines and the like Reciprocating Tools.
IPC: B23D7/00
Filed: 1917-01-17
Abstract: 112,657. Lancashire Dynamo & Motor Co., and Hargreaves, W. Jan. 17, 1917. Planing. - In a friction - clutch arrangement for operating the feed mechanism of a reciprocating tool such as a planer, an intermediate clutch member having adjustable angular movement determined by stops is interposed between the driven rotary operating clutch member and the clutch member keyed to the feedoperating shaft. The clutches are normally brought into operation and thrown out by tappets on the reciprocating part of the machine and the intermediate member respectively. In the construction shown in Figs. 1 and 2, the driving clutch member A, the intermediate clutch member D, and the clutch member C secured to the operating-shaft are arranged coaxially. The member A is driven by tooth gearing from a shaft R which also is connected by chain gearing, frictionally driven, to the member D and tends to drive it in the reverse direction. The clutch A is mounted on a sleeve h<1> in bearing H and supporting the shaft B' so as to have slight longitudinal play, and contains an electro-magnet M which is connected up to rings m<1> engaging brushes m<2>. The member C is keyed to shaft B<1> but has slight longitudinal play. The member D is attached to a slotted disk E carrying a fixed dog F and an adjustable dog G which is so shaped as to strike a switch lever S<1>prior to striking the stop P. The stops O, P are spring mounted, and stop F is so shaped as to glide over the stop C in one direction. The stop C is pivoted and can be turned in. A switch gear and suitable electrical connexions are shown in Fig. 11. R is a two-way switch, T is a double two-way hand-operated control switch with a middle off position. S is an electro-magnetically controlled switch pulled down by a spring and held up by a stop s<3> on the lever s<1>. When the switch R, which is operated by the reciprocating part at the end of the cutting stroke, or by the main reversing-switch when the tool is electrically driven, connects contacts r, r<2>, switch S is closed and held up by stops s<3>. When R connects r, r<3> at the end of the next return stroke, the clutch is operated until the lever s<1> is operated. When it is desired to cross-traverse the feed-screw, the parts A, C are positively connected by a bolt I, the stop G is turned in, and the lever T, Fig. 11, is moved over to connect contacts t<1>, t<3>, t<5>, t<6> to operate continuously the clutch. In a modification of the switch gear, the contacts r<1>, r<3> are connected at the beginning of the cutting stroke, and r, r<2> on the return stroke. In a modification, the part D, Fig. 1, is mounted on the shaft B<1> between the parts A, C, and A is mounted on the boss of D. The part A is driven by toothed gearing from an electric motor, and the disk E is formed with a pulley driven by belt gearing in a reverse direction by a pulley on a stud carrying one of the toothed wheels. In this construction, change-speed gearing and reversing wheels are interposed between the shaft B' and the feed shaft. In a further modification, a part similar to D, Fig. 1, is attached to a pulley driven by a pulley on the shaft K, and change-speed gearing is interposed between the part carrying the intermediate clutch member and the slotted disk. In the modification, Fig. 6, the parts A<3>, C<3>, D<3>, E<3> are similar to the parts A, C, D, E, Fig. 1. The disk E<3> is however returned by a coiled spring, or a bett attached to a weight or spring, and the stops are arranged on opposite sides of the disk E<3>. The stops O, P are arranged at the top and bottom, and behind and in front of the disk E<3> respectively. A bolt c<3> is withdrawn to disconnect the parts E<3> and D<3> when traversing the tool. In a further modification, the driving-clutch is connected to the shaft B<1> by means of a lever-operated cone clutch to traverse the tool, and the circuit is made and broken by raising the brushes by means of a high-resistance solenoid which is wound in parallel with the coil M the brushes engaging rings provided with gaps to break the circuit in the coil M. A modified form of stop G is described which enables it to strike the lever s<1> during either direction of rotation. Instead of the stops F, G engaging stationary stops, they may actuate levers which apply a brake to arrest the motion of the slotted disk. Instead of electromagnetic means for engaging the clutches, mechanical means or combined mechanical and electromagnetic means may be used.