Patent GB-190722222-A (GB)
Title: Improvements in or relating to Machine Tools.
Filed: 1907-10-08
Granted: 1908-11-09
Abstract: 22,222. Keall, F. B., and British United Shoe Machinery Co. Oct. 8. Carving and shaping by cutting. - Relates to machines in which a tool and the work are required to have a relative motion between them in a path agreeing with, or having a predeter-. mined relationship to, the contour of the work, and consists in the combination with a device which effects relative motion in a path other than this contour of a feeler which controls an hydraulic, electric, or other mechanism to adjust the relation of the work and tool so as to cause the path of relative motion to conform exactly to the contour, or to the predetermined relation to the contour. The invention is described as applied to an edge-setting machine for boots and shoes, in which the shoe is clamped in a work-support B, Fig. 1, adapted to be moved over a plate A' by cam rollers or studs carried by a lever C and engaging an approximately sole-shaped groove in the underside of the work-support. The edge-setting tool D, which is shaped to overlap the upper and lower surfaces of the sole edge as shown in Fig. 4, is adjustably secured in a universallymounted holder D<2>, and is pressed forwards by a spring D<10>. Without the correcting-mechanisms, the relative traverse of the tool and work, as the latter is moved in its approximately sole-shaped path by the cam rollers and groove, will be in a path agreeing exactly with the contour of the work, that is with a perfectly flat shoe sole. The actual curvature of the sole, however, requires that corrections should be made in order that the tool may be at all times normal to, and bearing evenly upon, the work at all portions of its contour. To effect the correcting movement whereby the line of thrust of the tool is kept normal to the work, two spring-controlled feelers E, Fig. 4, are employed. These are coupled-up with two levers, which receive between them a small lever E<17>, Fig. 1, pivoted to the levers at points which are situated at different distances from the axis upon which these levers swing. The lever E<17> is in connexion with the spindle F<1> of a double-valve hydraulic pump G, the piston G<1> of which is coupled up with the lever C carrying the cam rollers. When the tool is in a position to deliver its thrust at right-anglesto the work, there is no movement of the pump, but, when any variation in the contour of the work occurs, the feelers E, E<1> move relatively to one another, and through the connexions described actuate the pump valve to cause the piston G' to be set in motion. This swings the lever C, and consequently the worksupport, until the work returns the feelers to the normal position, when the pump valve is again shut and the pump stopped. The other correcting movement, which effects a relative turning movement between the work and tool about an axis normal to the acting face of the tool, is controlled by a second pair of feelers H, H<1>, which are coupled by mechanism similarly to that for the feelers E, to another hydraulic pump, the piston of which is in connexion with the universally-mounted tool-holder D<2>. Any movement of the feelers due to alterations in the level of the part of the work engaged by them causes the controlling-valve of the pump to open, and so to move the tool head until the tool is returned to its normal position with respect to the sole edge. This, as before, shuts off the valve and locks the tool head until another alteration in the level of the work occurs.