Patent GB-187980-A (GB)
Title: Improvements in machines having a reciprocating carriage
Inventor: LEON, WILLY
IPC: B27B29/08
Filed: 1923-12-06
Abstract: 187,980. LÚon, W. Dec. 6, 1923. Sawing-machine tables.-In the Specification as open to inspection under Sect. 91 (3) (a), the invention is not clearly described, but is concerned with a log-sawing machine or other machine having a reciprocating carriage f, Fig. 1, (Cancelled), and apparently comprises the production of the reciprocating motion by the use of a shaft a driven in one direction by a friction wheel e and in the reverse direction by bevel gearing l, power being obtained from pulley shafts c, j through electromagnetic clutches g, i. Claw clutches electromagnetically operated may be substituted. The closing of the circuits is automatically effected by a rotary controller m<1> adjusted by means of a star wheel h<1>. At the end of the forward travel of the carriage f, tappets (not shown) thereon actuate the controller m<1> to close the reversing circuit, and at the end of the reverse travel a tappet x<1> on the table again actuates the controller m' to close the circuit of an auxiliary motor z. This motor rotates a doubly-threaded screw a<1> upon which reciprocates a nut b' carrying an arm j<1> which bridges two conductors e<1>, f<1> and closes the circuit of a motor r for feeding the work across the carriage. This circuit remains closed until the arm j<1> meets an insulating hood i' and is lifted clear of the. conductors, e<1>, f<1>. The nut b<1> continues its movement until it meets the star wheel k<1>, when the third actuation of the controller m<1> takes place, bringing it back to the position for forward travel of the carriage. One of the conductors e<1>, f<1> is graduated, and their position with reference to the hood i<1> is adjusted by a screw d<1>, thereby determining the amount of cross feed of the log. The motor r may be caused to do the work of the auxiliary motor z by the arrangement shown in Fig. 5, (Cancelled). The motor r runs continuously and at the end of the travel of the carriage spring mounted clutch members t<2>, z<2> engage and transmit motion through a clutch b<3> to the screw a<1>, which in this modification is single threaded and controls a reversing-clutch transmitting motion from the motor r to the cross-feed mechanism. Hand controllers y<1>, z<1> are provided, but their use is not clearly stated. In the Specification as accepted the invention is concerned with machines having a reciprocating carriage where-upon are mounted brackets to which a cross feed is given, the latter movement being under the control of an automatic switching device, shown in Fig. 4, in which a four pole switch M<1>, when in the position shown, energizes a magnet G to put in a clutch E and causes rotation of a screwed shaft C so as to move a nut I thereon to the right. An arm J attached to the nut slides over an insulating cover m until it meets two bars a<1>, a<2>, whereupon the circuit for effecting the cross feed is energized, and the said feed. continues until the arm J moves clear of the end of the bar a<2>. Immediately afterwards the nut I actuates a switch arm K<1>, thereby connecting bars a<1>, a<4>, and causing the forward feed of the machine carriage to be put into action. The reverse rotation of the shaft C is brought about by a rotary controller acting in the manner described above, the switch M<1> being moved to bridge the contacts m<3>, m<4> and disconnect the contacts m<1>, m<2>. The position of the insulating cover m is adjusted by means of a hand wheel 0, and the amount of the cross feed thereby determined.