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Browse Prior Art Database

High Speed Paper Unload Stripper Bar

IP.com Disclosure Number: IPCOM000048527D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 3 page(s) / 32K

Publishing Venue

IBM

Related People

Drago, GA: AUTHOR

Abstract

Unloading paper from a drum in a printer is typically done at low speed (less than 50 cm per second). The single finger and stripper bar shown above is capable of unloading paper moving at a surface velocity of 500 cm per second. The stripper bar is oriented so that its main deflection surface is tangent to the print drum carrying the paper to be unloaded. The leading edge of this tangent plane, however, recesses relative to the point on the bar where a stripper finger starts the paper up onto the stripper bar. A frontal plate on the stripper bar is provided between this leading edge and the drum surface. This frontal plate paper sheet adjacent to the stripper bar as it leaves the drum. The stripper finger that starts the unloading of the paper also has a compound profile.

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High Speed Paper Unload Stripper Bar

Unloading paper from a drum in a printer is typically done at low speed (less than 50 cm per second). The single finger and stripper bar shown above is capable of unloading paper moving at a surface velocity of 500 cm per second. The stripper bar is oriented so that its main deflection surface is tangent to the print drum carrying the paper to be unloaded. The leading edge of this tangent plane, however, recesses relative to the point on the bar where a stripper finger starts the paper up onto the stripper bar. A frontal plate on the stripper bar is provided between this leading edge and the drum surface. This frontal plate paper sheet adjacent to the stripper bar as it leaves the drum. The stripper finger that starts the unloading of the paper also has a compound profile. In the unload position, the main portion of the stripper finger is in the plane of the stripper bar. The frontal plane of the stripper finger is at a sharper angle so that it may dip down into a groove on the print drum under the paper sheet to be unloaded.

Fig. 1 is a pictorial view of one embodiment of the stripper bar and finger. Print drum 10 contains vacuum slots 12 to hold the paper sheet 14 on the drum. Stripper bar 16 has a compound profile. Main plane 18 of the stripper bar is tangent to the surface of drum 10. Leading edge 20 of the main plane recesses away from the surface of the drum as the lateral distance from stripper finger 22 increases. Frontal plane 24 of the stripper bar extends from leading edge 20 to a point near the surface of drum 10. This frontal plate helps to maintain a low pressure zone between the paper and the stripper bar as the paper exits from the drum onto the stripper bar. This keeps the paper from flying up as it is stripped from the drum.

Stripper finger 22 starts the unload operation by dropping into groove 26 in the drum between the leading and trailing edges of the sheet. The leading edge is then picked off the...