22,035. Aders, M. L. C. F. Oct. 19, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Switches.-Relates to means for controlling and varying the length of the intermittent movements imparted to the paper-carriages &c. of typewriters, printing-telegraphs, recording cash-registers, recording calculating-machines, &c., and comprises an adjustable abutment moved by the carriage and adapted to operate a valve, switch, &c., so as to cut off the supply of energy to the motor actuating the carriage. The invention is described as applied to a typewriter in which the paper-carriage is actuated by a compressed-air motor. The movable abutment b, which is rotated by a part a attached to the upper carriage, is provided with a gapped flange l, with which a pawl i, pivoted to a spring- controlled slide valve c, is adapted to engage. The valve c serves to control the supply of air to the motor for actuating the carriage, and also the supply of air to a cylinder g which contains a piston attached to the abutment b, thereby effecting the engagement and disengagement of the parts a, b the valve c may also control a brake for the carriage. During the movement of the carriage, the pawl i is in engagement with the flange l, and, immediately the pawl comes opposite the gap m in the flange of the moving abutment, the slide c is moved by the spring d and puts the motor and the cylinder g into communication with the exhaust. The initial position of the abutment b and the consequent travel are controlled by the engagement of a projection o on the abutment with an adjustable abutment or stop n. The position of the stop n is adjusted by means of a screw p and a nut q, an indicating-device s, t being arranged in connexion with the screw. By providing duplicate stops n, n<1> or duplicate projections o, the arrangement is made suitable for either direction of travel of the carriage a. The gap m may also be utilized for controlling devices connected with other parts of the machine, such as devices for neutralizing the momentum of the moving parts. As shown in Figs. 1 and 1<a>, a spring-controlled slide or valve x is arranged to bear against the flange l externally; the part x<1> of the slide x may be narrower than the pawl i so that the slide x is operated before the valve c. In order to move the abutment b back to its initial position after each movement of the carriage, a spring or weight or a separate actuating-device is employed. As shown in Fig. 3, a spring u, is connected at one end to a toothed quadrant z meshing with a pinion z<1> on the part b, and at the other end to a lever w mounted to rotate independently of the quadrant. The lever w is rotated in one direction or another according to the direction of travel of the carriage so as to bring the abutment to its initial position and to tension the spring u. During the motion of the carriage, the quadrant is turned, thus further tensioning the spring, and upon the release of the abutment it is returned to its initial position by the action of the spring. The lever may be employed for actuating the slides y so as to reverse the motor. Instead of compressed-air &c., electricity may be employed for actuating the carriage, in which case a switch, which may control a number of circuits, is substituted for the valve c. In a modification, the stops or abutments n, n<1> are mounted nn quadrants which are geared together and operated by worm gearing, and the movable abutment is formed as a segment. In another modification, the stops n, n<1> are arranged as doublearmed shear levers adapted to be operated by a wedge, cone, or the like. The Specification in the original form, as open to inspection under Section 91 (3) (a), comprises the general application of the device for the purpose of determining or controlling the periodical movements of intermittently moving machine parts or objects moving in straight or curved paths. This statement of general application does not appear in the Complete Specification as accepted.