Patent GB-280882-A (GB)
Title: Improvements in potters' and like jigger mechanism
IPC: B28B5/02
Filed: 1927-10-26
Abstract: 280,882. Miller, W. J. Nov. 17, 1926, [Convention date]. Pottery, throwing and turning.-In a machine for jigging pottery-ware mould-carriers 16 are adapted to be intermittently advanced in series in a straight line on a support 54 so as to bring the moulds 15 into operative position relative to shaping &c. mechanism, means being provided (for example chucks 14) to move the moulds vertically into the shaping position. Each chuck 14 is mounted on a spindle 13 adapted to be reciprocated by a fork 18 carried by a pitman 19 pivoted at 27 to a lever 25 pivoted at 28 and operated by a cam 30. The rod 19 slides in a slot 11<b> provided in housings 11<a> of the frame 11. The lever 25 is formed with a slot in which slides a block 29 pivoted to a block 35 mounted on a bracket on the frame 11. The stroke of the rod 19 may be varied by shifting the block 35 by an adjusting screw, the shift being in such a direction that the lower limit of oscillation of the lever 25 remains unaltered. The cams 30 are adjustably mounted on a shaft 38 driven from a power shaft 39 by spur gears 89, 90, or from an independent power shaft. Each of the spindles is rotated in raised position by a friction gear 40 engaging a gear 41 on the shaft 39 as described in Specification 279,503. A carrier 16 may carry two or more moulds disposed either longitudinally or transversely or in both such positions relatively to the direction of travel of the carriers and as many jiggers may be served as there are moulds on the carrier. The carriers 16 are moved along the tracks 54 by a pair of arms 47 pivoted at 48, reciprocated by cam 45 engaging roller 46, and connected at their upper ends to pawls 52 engaging pins 55 on the sides of the carriers. The throw of the arms 47 is adjusted by inserting their pivots 48 on one pair of a number of pairs of openings 50<a> in the arms. The throw may be doubled by moving the pivots to the brackets 49<a>. When the material 56 on the mould 15 has been profiled, the pawls 52 operate to bring a second carrier into position and displace the first carrier. The apparatus may be adapted to move a series of carriers simultaneously into operative positions. Springs 69, Fig. 3, engage the ends of the pins 55 and yieldably locate the carriers in operative position. Openings 57, having bushings 67, are provided in the carriers 16 for receiving the moulds. The profiles 58 and trimmers 66 are carried by brackets 61 secured by screws 81 to platforms 68 which are mounted on the frame 11 and spaced apart therefrom by blocks 87. The Specification as open to inspection under Sect. 91 (3) (a) describes also the following subject-matter. Each profile 58 is carried by a slotted sliding-member 59 suspended by an adjusting screw 63 and plate 62 from the bracket 61. Each member 59 is guided between a pair of guides 61<a>. The edge-trimmer 66 is secured by a screw 94 to a holder 70 which is secured to the bracket 61 and to one of a pair of guides 61<a> by screws 71. The trimmer 66 and holder 70 may be adjustable horizontally and vertically. A spring 64, connected to a screw 74 on the sliding member 59 and to the guides 61<a>, assists in bringing down the member 59 after the latter has been raised by the rod 19. The rod 19 projects through a hole 93 in the frame part 23, and when raised, strikes the head of a screw 65 connected to the underside of the member 59 and such striking operation lifts the profile member after completion of the profiling operation. The trimmer 66 thus operates and continues as the mould 15 and profile 58 rises. After completion of trimming the chuck 14 and rod 19 recede, the sliding member 59 and profile are brought down by the spring 64 with the plate 62 resting on the bracket 61 and guides 61a, and the mould 15 is intercepted by the carrier 16. This subjectmatter does not appear in the Specification as accepted.