Patent GB-191513335-A (GB)
Title: Improvements in Engraving Machines.
Inventor: KELLER JOSEPH FINK
IPC: B44B3/00
Filed: 1915-09-18
Abstract: 13,335. Keller, J. F., and Warman, W. A. Sept. 18. Engraving.-Relates to engraving-machines of the kind in which the tracer and cutter are carried by a swing- ing frame, and the pattern and die on one or more moving tables, and consists chiefly in the provision of such a machine in which the frame and table may be actuated together by power or may be actuated manually and independently of each other. The tracer 30 and cutter 31 are mounted in a frame 23 connected by pivots 24 to a slide 22 fed intermittentlyalong horizontal guides 21 by a screw 84. The pattern 27 and die 28 are fixed to a table 26, which is reciprocated on vertical guides by a feed-screw 61 connected by a clutch 74 with a shaft 62 driven by a reversible motor 64. The motor is reversed at the ends of the strokes of the table 26 by means of a switch 66 operated by a rod 67 carrying adjustable stops 68 engaged by a lug 69 on the table. The table 26 may be operated manually by means of a hand-wheel 76 on a shaft 77 geared to the feed-screw 61, the parts of the clutch 74 being previously disconnected. The slide 22 is advanced at the end of each upward or downward movement of the table 26 by means of a pawl 87, Fig. 7, and a clutch ring 88 secured to the feed-screw 84, the clutch ring 88 lying in a recess 90 and being adapted to be gripped between the upper side of the recess and the lower side of a notch in a hard-steel plate 91. The pawl 87 is slidably pivoted by means of a notch 92 and screw 93 to an arm 94 of an oscillatable sleeve 95. The pawl is held in the mid-position so as to be inoperative, or to either side according to the direction in which the slide is being fed, by springs 101 engaging recesses in the pawl and engaged byabutment plates 99 adjustable by screws 97 carried by the arm 94. The sleeve 95 is oscillated by an arm 103 and link 102 connected to an arm 104, Fig. 1, of a friction disk 105 loose on a shaft 106 which is driven from the motor 64 and carries disks 108, between which a.nd the disk 105 are arranged leather or like disks. At every reversal of the motor 64 and consequently of the shaft 106, the disk 105 makes a partial revolution and produces an oscillation of the pawl 87 to an extent determined by a lug 110 on the arm 103 and an adjustable stop 111. The slide 22 may be actuated manually by placing the pawl 87 in the mid-position and turning a hand-wheel 116, which is connected by chain gearing 122 to a sprocket-wheel detachably connected to a disk 113 secured to the feed-screw 84. The disk 113 is graduated and moves past a pointer 123 to allow the rate of feed to be observed. The rotary cutter 31, Fig. 15, is secured to a carrier 38 rotatably mounted in a sleeve 39 clamped in the swinging frame 23. The carrier 38 is formed with a squared end engaging loosely in a square hole in a plate 4.5 carrying a grooved pulley 42 and a sleeve 43, by which the pulley is carried by a bracket 44 on the frame 23. This arrangement permits ready removal of the cutter without disturbing its driving-arrangement, and the cutter is free from the strain of the driving-cord. The pulley 42 is driven by a cord 58, Fig. 1, passing round tensioning-pulleys 59 and round large and small pulleys 50, 51 on the shaft of a driving-motor carried by the frame 23. Either of the pulleys 50, 51 can be connected to their shaft by means of a sliding key operated by a member 52, so that the speed of the cutter may be varied. The weight of the frame 23 is counterbalanced by a weight 136, Fig. 2, and that of the table 26 by a weight 138, and the tracer and cutter are held against the work by a weight 32 suspended from a lever 33 connected to the frame 23 by a cord 36. A spring 37 tends to throw the frame outwards away from the table 26. When working the machine manually, the spring 37 may be allowed to throw the frame 23 outwards when desired by causing the motor 64 to lift the weight 32. For this purpose, the shaft of a gear 125 driven by the motor carries a friction pulley 127 embraced by a belt 128 passing over a drum 124 loose on the motor shaft. The ends of the belt are connected to a treadle 129 and to one end of a lever 131, the opposite end of which is connected to the weight 32 by a normally loose cord 133. By depressing the treadle, the belt 128 is caused to grip the pulley 127 and the weight 32 is thereby raised. The table '26 is preferably made in two parts, which may be secured together by lugs 148 and bolts 149 to form a single structure, or may be driven simultaneously in opposite directions to produce a right-hand die from a left hand pattern, or vice versa. In the latter case, the upper part of the table is driven by a screw co-axial with, and detachably connected to, the feed-screw 61, the screws being right and left handed. The support for the table 26 may have a curved back concentric with the feed-screws and be adjustably secured to a curved seat on the frame of the machine, so that the table may be adjusted angularly with respect to the cutter and tracer to suit the work in hand.