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Delivery mechanism, fixing device and image forming apparatus

Inactive Publication Date: 2006-08-03
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] A first object of this invention is to provide a sheet delivery mechanism which when a sheet is kicked out by a convex attached to at least one of a first roll and second roll of a sheet delivery roll pair, can prevent poor accommodation due to leaving of a sheet rear end without being hindered by another convex located on the downstream side of the convex.
[0009] A second object of this invention is to provide a sheet delivery mechanism which when can deliver a thick sheet without damaging it.
[0010] In order to attain the above object, the first feature of this invention is to provide a sheet delivery mechanism characterized by including a sheet delivery roll pair consisting of a first roll and a second roll in contact with each other, wherein at least one of the first roll and the second roll is provided with a plurality of convexes formed circumferentially for pushing the rear end of a sheet to be delivered, and one of these plurality of convexes is arranged to be more inside radially than the tangential line drawn from the radial tip of another convex upstream adjacent in the rotating direction to the one convex to the outer periphery of the roll. In accordance with this configuration, even where the sheet rear end delivered may be left on the first roll or the second roll, when the sheet rear end is kicked out by the convex immediately passed a nip, it is not hindered by the convex located on the downstream side of the above convex. This prevents poor accommodation due to the leaving of the sheet rear end.

Problems solved by technology

However, if the sheet is discharged with the rear end slanted downward in a certain degree according to the convex in the kicking shape, the sheet interferes with the convex on the downstream side in a rotating direction and floats.
Thus, the rear end of the sheet cannot be pushed by the portion of the kicking shape.
This led to a problem of poor accommodation due to the leaving the rear end of the sheet.
Further, in the case of the elastic blade-like convex, if a fixing roll is arranged in the vicinity of the delivery roll, time-passage deformation was inevitable which is attributable to degradation of the material due to heat or the like.

Method used

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  • Delivery mechanism, fixing device and image forming apparatus
  • Delivery mechanism, fixing device and image forming apparatus
  • Delivery mechanism, fixing device and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0056] Next, referring to the drawings, an explanation will be given of the delivery roll pair 34 according to this invention.

[0057]FIG. 2 is a side view of the status in the vicinity of the delivery roll pair 34 according to the first embodiment of this invention. FIG. 3 is a side view of the delivery roll pair 34 shown in FIG. 2 when it is viewed from the side of the delivery tray 36.

[0058] As seen from FIGS. 2 and 3, the delivery roll pair 34 consists of a lower pinch roll (first roll) 100 and an upper follower roll (second roll) 102 which sandwich the nip 35 therebetween. The pinch roll 100 is provided in a status wider than the follower roll 102 in an axial direction, and located on the side nearer the delivery tray 36 than the follower roll 102.

[0059] At the center of rotation of the pinch roll 100, a rotary axis 103 for rotation-driving the pinch roll 100 is provided. The pinch roll 100 includes a roll body 104 and a plurality of convexes 106 formed circumferentially on bot...

second embodiment

[0066] An explanation will be given of the delivery roll pair 34 according to this invention.

[0067]FIG. 5 is a side view of the status in the vicinity of the delivery roll pair 34 according to the second embodiment of this invention. FIG. 6 is a side view of the delivery roll pair 34 shown in FIG. 5 when it is viewed from the side of the delivery tray 36.

[0068] As seen from FIGS. 5 and 6, the lower pinch roll 100 is circular in section at the zone in contact with the upper follower roll 100. The pinch roll 100 is provided in a status wider than the follower roll 102. The pinch roll 100 is located on the side (left side in FIG. 5) nearer the delivery tray 36 than the follower roll 102. At the center of rotation of the pinch roll 100, a rotary axis 103 for rotation-driving the pinch roll 100 is provided. The pinch roll 100 includes a roll body 104 and a plurality of convexes 106 formed circumferentially on both ends of the roll body 104 not in contact with the follower roll 102. The ...

third embodiment

[0072] An explanation will be given of the delivery roll pair 34 according to this invention.

[0073]FIG. 7 is a side view of the status in the vicinity of the delivery rolls 34 according to the third embodiment of this invention. FIG. 8 is a partial sectional view of the delivery roll pair 34 shown in FIG. 7 when it is viewed from the side of the delivery tray 36.

[0074] The delivery roll pair 34 consists of a lower pinch roll 100 and an upper follower roll 102. The pinch roll 100 is circular in section at the zone in contact with the follower roll 102. The pinch roll 100 is formed in a status wider than the follower roll 102 in an axial direction, and located on the side (left side in FIG. 7) nearer the delivery tray 36 than the follower roll 102. At the center of rotation of the pinch roll 100, a rotary axis 103 for rotation-driving the pinch roll 100 is provided.

[0075] The pinch roll 100 includesaroll body 104 and a plurality of convexes 106 formed on both ends in the rotating di...

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PUM

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Abstract

A sheet delivery mechanism including: a first roll; a second roll; and a plurality of convexes formed circumferentially for pushing a rear end of a sheet to be delivered, wherein: a sheet delivery roll pair comprises the first roll and the second roll in contact with each other; at least one of the first roll and the second roll is provided with the plurality of convexes; and one of the plurality of convexes is arranged to be more inside radially than the tangential line drawn from the radial tip of another convex upstream adjacent in the rotating direction to the one convex at issue to the outer periphery of the roll.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a sheet delivery mechanism in an image forming apparatus such as a printer, copier or facsimile and a fixing device and the image forming apparatus having the sheet discharging mechanism. [0003] 2. Background Art [0004] In the image forming apparatus, it is known that when a sheet with an image formed by an image forming section is delivered or discharged into an output tray, a paper delivery roll pair consisting of a follower roll and pinch roll which sandwich a nip are used. [0005] Until now, a sheet delivery mechanism is known which is a sheet delivery roll serving as an inverting roll for both-side printing, provided with a slope on the side acting when the convex portion of the kicking shape of a pinch roll is inverted (JP-B-7-17295). Another paper delivery mechanism is known in which the rising angle of the convex of the kicking shape on the side acting in delivery is set at 45° or le...

Claims

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Application Information

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IPC IPC(8): B65H31/00B65H29/20
CPCB65H29/22B65H2404/1116B65H2404/1118
Inventor OSHIDA, HIDEO
Owner FUJIFILM BUSINESS INNOVATION CORP