Patent GB-190913478-A (GB)
Title: Improvements in or relating to Milling or Grooving Machines.
IPC: B23C3/24
Filed: 1909-06-09
Granted: 1910-09-09
Abstract: 13,478. Lanston Monotype Corporation, [Bancroft, J. S., and Indahl, M. C.]. June 9. Milling.-An automatic milling - machine for performing more than one operation on a blank, which remains in the same position in the machine during the operations, has blank-feeding, gauging, chucking, and indexing means for the work. The machine is particularly applicable to forming the suspension and alining grooves 1, 2, Fig. 32, in type matrices such as those employed in the diecase described in Specification 4726/05, [Class 100, Printing, Letterpress &c.]. The machine comprises two rotary cutters 3, 4, Fig. 5, which correspond in width with the grooves 1, 2 respectively, and are carried by a frame 6, which is reciprocated vertically past the matrix to be grooved. The matrix is supported by a clamp or chuck and an opposed centring-device, and is intermittently rotated through 90 degrees so as to present successive sides to the cutters. The matrices are taken one at a time from a supply galley and, after being grooved, are delivered to a receiving-galley. The cutters 3, 4 are carried by shafts 5, which are mounted in eccentric bearings to permit the depth of cut to be varied and are connected by flexible and extensible couplings to belt-driven pulleys. Chucks; gauging-devices.-The chuck comprises a hollow spindle 16, Fig. 9, having a removable head or plate 17, to which are secured two independently-adjustable jaws 18, Fig. 16, forming an angular seat. The matrix is clamped against the jaws 18 by a movable jaw 19 carried by a lever 21, which is pivoted within the spindle and is operated by a sliding rod 24 and a cam. The end of the matrix bears against a sliding gauge-block 27, which is advanced by the rod 24 to eject the finished matrix. Opposed to the chuck is a spindle 30, Fig. 6, having a conical point which is adapted to enter the recess in the end of the matrix. The spindle is retracted by a cam to allow a matrix to be placed in position and removed, and is surrounded by a sliding plate 31 carried by rods 32, which serves as an abutment for the end of the matrix and to disengage the matrix from the spindle. Indexing.-The indexing means comprises a pinion 43, Fig. 11, loose on the sleeve 16 and carrying a pivoted pawl 44 which can engage four equally-spaced notches in a disk 45 secured to the sleeve. The pawl 44 is provided with a toothel segment gearing with a similar segment on an arm 58 also pivoted to the pinion 43. The pinion is oscillated by a reciprocating rack, and pins 54, 59 on the pawl 44 and arm 58 respectively are engaged by a cam-path in a vertically reciprocating slide whereby the pawl is caused to engage the notches 46 in succession and to rotate the sleeve 16 through ninety degrees at a time. The sleeve is looked in its successive positions by a notched disk 40 and a sliding bolt. Blanks, transferring.-The blank - transferring means comprises a frame 63, Fig. 19, pivoted at its rear end 64 to an horizontally reciprocating carriage 65. The frame 63 is provided with two sets of jaws 71, 72, of which the lower set is adapted to supply a matrix to the chuck, and the upper set to remove the finished matrix. The jaws are normally closed by springs 77 acting through rods 75, and are opened by a lever 79 mounted on the carriage 65. The front end of the frame 63 is reciprocated vertically by a slide 78 to bring either set of jaws to the level of the chuck. When the frame 63 is in the retracted position shown in Fig. 19, the jaws register with channels 93, 100, Fig. 34, which communicate with the supply and receiving galleys respectively. A matrix is pushed by a slide 105 from the supply galley into the lower set of jaws which are opened to receive it, and, simultaneously, a projection 106 on the slide 105 pushes the finished matrix from the upper set of jaws into the channel 100, from which it is pushed into the receiving-galley by a pusher 103. The galleys are removably supported on either side of, and parallel with, the frame 63, the matrices in the supply galley being pushed forwards by a weight-actuated follower. Cuttings, catching and removing.-To protect the jaws from chips, the cutters are surrounded by a casing having a spring-closed door which is pushed aside by the frame 63.