Browse Prior Art Database

Strip Feed Mechanism

IP.com Disclosure Number: IPCOM000096640D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Reed, DW: AUTHOR

Abstract

This strip feed mechanism has a feed drum 10 rotatably mounted on shaft 11. Strip 12 contains uniformly spaced circular perforations 13. Plural feed pins 14 carried by drum 10 are uniformly spaced on it to coincide with the spacing of perforations 13 of strip 12. Pivoted guide member 15, shown in broken line, holds strip 12 against the periphery of drum 10 as pins 14 move within perforations 13. A recording device 16 such as a punch or printer is situated in advance of drum 10 to operate on strip 12.

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Strip Feed Mechanism

This strip feed mechanism has a feed drum 10 rotatably mounted on shaft
11. Strip 12 contains uniformly spaced circular perforations 13. Plural feed pins 14 carried by drum 10 are uniformly spaced on it to coincide with the spacing of perforations 13 of strip 12. Pivoted guide member 15, shown in broken line, holds strip 12 against the periphery of drum 10 as pins 14 move within perforations 13. A recording device 16 such as a punch or printer is situated in advance of drum 10 to operate on strip 12.

Each pin 14 is shaped with a tapered upper surface. The taper follows an involute curve to permit pins 14 to move into and out of perforations 13 without damage to the perforation edge. Segments 17 are removed from the surface of pins 14 at three uniformly spaced peripheral locations.

Segments 17 are cut deep enough to provide substantial clearance with the perforation edge. Segments 17 are spaced to provide three-point contact with the perforation of strip 12. One of the points of contact is in line with the direction of movement, as shown by the arrows. The other two are on the opposite sides of and in the opposite direction to the direction of movement. The three-point contact provides all-around good registration. The clearance provided by the segments permits strip 12 to seat fully on drum 10 even where perforations are slightly undersized due to variations in manufacturing.

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