Patent GB-190907170-A (GB)
Title: Improvements in or relating to Driving or Transmission Mechanism for Type Casting and similar Machines.
IPC: B41B7/04
Filed: 1909-03-25
Granted: 1910-03-26
Abstract: 7170. Lanston Monotype Corporation, [Bancroft, J. S., and Indahl, M. C.] March 25. Driving-mechanism for typecasting machines &c. In driving-mechanism in which it is desired to produce a dwell in the motion of the mechanism to permit setting of the metal before its discharge from the mould, the driving and driven members are connected by coupling-means such as a clutch, which is provided with an adjustable timing- mechanism automatically controlled by the mould-adjusting devices so as to vary the length of the dwell proportionately to the size of the mould-cavity. The driving-member consists of a pulley provided with an annular bearing-surface 2, Fig. 5, which surrounds the hub 3 of a cylindrical head 4, Fig. 6, fixed to the driven shaft 370. Mounted to turn freely on the hub 3 is a sleeve 5 having an arm 6 which is movable between shoulders 7 on the head 4. The sleeve is slotted to receive rollers 9, which rest between the bearing-surface 2 and cam-surfaces 10 on the hub 3. A spring connecting the sleeve 5 and head 4 causes the sleeve to move the rollers towards the higher parts of the cam-surfaces so as to close the clutch. After one revolution, the clutch is opened by the interposition of a stop 12 in the path of the arm 6, whereby the sleeve 5 is arrested and the rollers are moved on to the lower parts of the cam-surfaces. The stop 12 is supported by a pair of links 13, Fig. 6, pivoted to a lever 14, which is suspended from a pivot on the machine frame. An arm 17 on a shaft 371, which rotates in unison with, and in the same direction as the shaft 370, is adapted to engage a latch 18 pivoted to the links 13 and connected by a link 19 with the stop 12. The lever 14 is connected with a cushioning-device such as the die-case controlling-mechanism described in Specification 15,548/07. The stop 12 is connected by a link 43 to a lever 44 carrying a roller which rests upon a cam 45 loose on a shaft 46, to which it is connected by a clutch similar to the main clutch described above. The cam 45 serves to withdraw the stop 12 and to permit the main clutch to close. The timing-mechanism comprises a constantly-running shaft 75, Fig. 5, which is connected to the driving-member 2 and extends through a sleeve 76 journaled in an adjustable bearing 77. A spring 79 tends to rotate the sleeve, which is arrested by the contact of an arm on the sleeve with a stop 81 on the bearing 77. The sleeve 76 is driven in opposition to the spring 79 by the shaft 75, to which it is connected by a clutch 82 preferably similar to the main clutch and operated by a sliding casing 91 and a lever 99. The upper end of the sleeve 76 is provided with gear teeth, and on the upper end of the shaft 75 is mounted a second sleeve 93 also provided with gear teeth. The two sleeves are connected by epicyclic gearing carried by a rotatable frame 95. The lever 99 is held raised, so that the timing- clutch 82 is closed, by a spring-actuated detentlever 103, of which the upper end lies in the path of an arm 104 on the sleeve 93. When the arm 104 strikes the lever 103 and the frame 95 is held stationary, the lever 103 is rocked so as to release the lever 99, which falls and opens the clutch. The time during which the clutch remains closed can be varied by adjustment of the stop 81. To enable the time to be varied in proportion to the size of the mould-cavity, the frame 95 is connected with a lever of which one end lies in the path of an arm on the mould-blade adjusting-rod. When the arm 104 strikes the lever 103, the further motion of the sleeve 76 rotates the frame 95 until the frame is arrested by the mould-blade adjusting- rod. The arm 104 then overcomes the resistance of the lever 103 and opens the clutch. Thetiming-clutch is closed by a projection on the driven member of the main clutch which strikes an arm 115 secured to the lever 99. The timing-mechanism may be connected directly to the stop 12 of the main clutch by means of an arm of the lever 99, but to permit the driven mechanism to be turne I by hand in either direction when the clutch is open, a secondary clutch which connects the cam 45 to its shaft 46 is introduced. The operating-sleeve of the clutch is arrested, and the clutch held open, by a pivoted arm 118 connected by a latch 119 with an arm of the lever 99.. When the timing-clutch is opened by the lever 99, the arm 118 is withdrawn, and the secondary clutch closes. The cam 45 rotates and raises the stop 12, permitting the main clutch to close. The latch 119 is tripped by the cam, and the arm 118 returns into position to open the clutch aud stop the cam 45 after one revolution. To permit the driven mechanism to be turned by hand, means operated by a hand-lever is provided for locking the main clutch in open position and for holding the stop 12 permanently out of the path of the arm 6 of the operating-sleeve 5. The mechanism can be adapted for continuous transmission by removing the stop 12 or retaining it in elevated position, or by setting forwards the timing-mechanism so that the stop 12 is withdrawn before it is encountered by the arm 6. Specification 8633/99 is referred to.