Patent GB-797283-A (GB)
Title: Improvements in or relating to record controlled tabulating or other imprinting machines
Inventor: VAUGHAN FRANK EDWARD JOHN
Filed: 1955-04-28
Abstract: 797,283. Record-controlled printing. POWERS-SAMAS ACCOUNTING MACHINES, Ltd. March 2, 1956 [April 28, 1955], No. 12350/55. Class 100(4) A long paper feeding mechanism for record controlled tabulating and like imprinting machines comprises a rotatable drive shaft 18, Fig. 3, normally coupled to a first driving means e.g. an electromagnetic clutch 25 to impart a constant linear speed during imprinting operations to paper feeding elements via shaft 15, and a second driving means, e.g. a clutch 32 under the control of a long feed initiating means which imparts a long feed at greater speed than that of the first driving means. The clutch 25 is operative during imprint operations, but upon receipt of a long-feed signal, sensed from a record, an arm 34, Fig. 10, is rocked and a switch slide 40 closes switch 41, and one of three solenoids 45, Fig. 13, are operated according to the position of a disc 47, Fig. 4, coupled to the feed shaft 15 and which is detachably mounted in a frame 107 adjustably carried on a pivot 108 to the frame 38. The solenoid to be rendered active is determined by a contact of the disc 47 of the timing device, which in turn wipes over contacts connected to the three solenoids 45, the one energized depending upon the angular position of the disc 47 which also determines the speed of the long feed. Operation of one of the solenoids 45 rocks a tooth 53 of a trip lever 52 out of the path of a tail 54 of one of three clutch pawls 55 which are clutched to one of three cam shafts 59, 60, 61, and rotate clutch control cam 63, rock a lever 64, raise a slide 67, operate cable 68, Fig. 7, and activates a clutch-conditioning device. The cable 68 rocks an arm 69, and a pawl 71 on it rocks a ratchet 74 which causes a setting pawl 82 to rock a spindle 83, Fig. 4. This moves a setting lever 84 to engage beneath a pin 85 extending through a latching pawl 86 on a trip arm 87. Pin 85 raises latch pawl 86 and so rocks a change-over arm 89 clockwise and operates a switch 92- 93. Contacts 92 of the switch open to release the clutch 25, and switch contacts 93 close to cause energization of the magnetic clutch 32 and thereby initiating a long feed operation which continues due to a latching device. The long feed is terminated when an appropriate abutment 97 on the disc 47 is moved into engagement with the arm 98 of the trip arm 87 and unlatches the arm 89. As the pin 97 leaves the arm 87 and the trip arm 87 is restored in preparation for a further long feed. The pin 97 next engages a stop arm 100, and a control cam on the shafts 59, 60, 61 operates a linkage 103-101 to lift the stop arm 100 out of the path of the pin 97 to permit continued rotation of the disc 47. The temporary stopping of the disc 97 by the arm 100 ensures that the first magnetic clutch 25 is rendered fully effective to cause continued movement of the paper feed at the predetermined linear speed immediatly the arm 100 is moved from the path of the pin 97. In order to prevent rebound from the stop arm 100 during a high speed feed and to maintain the pin 97 in engagement with the stop arm 100 the clutch magnet 25 is partially operated all the while through a resistor. A paper feed from the bottom of one form to the first item of the next form is signalled by an operating stud on a disc (48, Fig. 11, not shown) coaxial with the disc 47 pivoting a lever 116 which rocks arm 119 and operates a switch slide 124. At the same time a further stud on the disc 48 engages a trip lever 123 which prevents a signal operated long feed if a continuation form is required. The operation of trip lever 123 actuates the slide 124 which makes the switch 41 inactive enabling a feed to the first line of the continuation sheet to be made.