JPS61140450A - Paper feed path of copying machine - Google Patents

Abstract

PURPOSE:To decrease the overall size of a copying machine and reduce the manufacturing cost thereof by providing the middle between a photosensitive member and a fixing assembly with a copy paper feed path formed by bending the middle portion downward, the path being longer than the rectilinear distance between the photosensitive member and the fixing assembly but shorter than the length of a copy paper. CONSTITUTION:In a copying machine, a copy paper feed path 5 is arranged between a photosensitive member 1 with a feed speed V1 and a fixing assembly 4 with a feed speed V3 (V3>=V1), the path 5 being formed by bending the middle portion downward between the photosensitive member 1 and the fixing assembly 4 and being longer than the rectilinear distance between the member 1 and the assembly 4 but shorter than the length of a copy paper. A copy paper fed from the photosensitive member 1 is fed as bent along the surface of the path 5 and as being longer than the rectilinear distance between the member 1 and the assembly 4. Thereafter, the copy paper is fed through the fixing assembly 4 with the same feed speed as the photosensitive member 1 or with a higher feed speed than that of the photosensitive member 1 to the extent that the bent paper is made flat.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper conveyance path in a copying machine, and particularly to a paper conveyance path between a photosensitive material and a fixing device.

BACKGROUND OF THE INVENTION The conventional paper conveyance path is as shown in FIG. 5, in which a vacuum conveyor C is provided between the photosensitive material α and the fixing device, which are spaced apart from each other by l. The paper onto which the photosensitive material α has been transferred is transported to the fixing device AK by the vacuum conveyor CK.

In this case, when the feed speed of the sensitive material α is r8, the feed speed of the vacuum conveyor C is 6, and the feed speed of the fixing device is 4, r
The relationships are 3≧V and ≧r1 (provided that when the maximum paper size L is L>j). If this condition is not met, the paper forms a loop between the photosensitive material α and the vacuum conveyor C, causing image distortion.

Problems to be Solved by the Invention Since the conventional paper conveyance path described above uses a vacuum conveyor C, the distance j between the photosensitive material α and the fixing device becomes long, and There was a problem of high cost.

Means and Effects for Solving the Problems The present invention was conceived in view of the above-mentioned problems, and includes a photosensitive material with a feed speed of 6 and a fixing device with a feed speed of Vl (provided that 4≧
rr), a transport path is inserted between the paper and the paper by bending the intermediate part downward to make it longer than the straight line distance between the photosensitive material and the fixing device and shorter than the length of the paper. The sheet of paper is fed out along the conveyance path in a bent state for a length longer than the straight line distance between the photosensitive material and the fixing device, and then in the fixing device, the paper is fed at the same speed as the photosensitive material or the bent sheet is straightened. The feeding speed of the photosensitive material is set to be as fast as possible.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 4.

In the figure, reference numeral I denotes a photosensitive material, and a latent image is formed on the photosensitive material I by an optical system (not shown), and is then developed into a toner image by a developing device (not shown). 2 is a paper feeding device, 3
1 is a transfer device, in which a toner image of the photosensitive material 1 is transferred by a transfer device 3 onto a sheet of paper fed from a paper feed device 2. 4 is a heating type fixing device, and this fixing device 4 is used for the photosensitive material 1.
A transport path 5 is located between the photosensitive material 1 and the fixing device 4.
is the provision. This conveyance path 5 has two guide plates 5α and 5b.
It has a shape that is bent downward at .

In the configuration of each of the above parts, as shown in FIG.
, each path length of each guide plate 5α, 5b is Jt −I
s (however, ls < h + ls), the speed of the photosensitive material 1 is V, the speed of the fixing device 4 is r8, the length of the maximum paper is exceeded, and the paper sent out from the photosensitive material 1 is sent along the curved conveyance path 5. 14 is the length of the paper that is inside the photosensitive material 1 when its leading edge contacts the fixing device 4, and the length j4 of the paper that is inside the photosensitive material 1 is the speed VII of the photosensitive material I. /C and feeding time tl, the paper is sent along the conveyance path 5, and from the state where the leading edge of the paper is in contact with the fixing device 4, the paper reaches the speed V of the photosensitive material 1.
It is sent by the fixing device 4 at a speed V3 faster than 1 and transferred to the conveyance path 5.
The time it takes from a bent state to a straight line along t
! When it is closed, the following relationship is established. Here, t2≧t holds true as a condition.

In other words, if we consider the case of sending a sheet of length L, the number of sheets is 4+! , and the time t1 for sending the remaining distance 14 is the time when ()g+7m) becomes J (the time when the paper changes from a bent state to a taut state) t! - Must be small. If this is reversed, the image will become distorted.

Okay, Vs C1t+1B-Jt) ≧(Vs-Vt)(L-
(4+6))(L-4)Vt ≧CL-It-Is)V
In other words, since r, ≧r, the speed r3 of the fixing device 4 is less than or equal to the speed of the photosensitive material 1.

A case in which the above relationship is actually applied will be explained below.

lt+ ls= l 35-111= I 32+mL
=420tpa<A5 feed), VI=30Qm/s
If ec, then Vs can be determined so as to satisfy 303.16≧Vs≧300. Considering this example, the distance l between the photosensitive material I and the fixing device 4 may be between 1 and 132, and the distance of the conveying path 5 may be 3 meters apart.

The guide plates 5Z and 5AFi constituting the conveyance path 5 may be made of plate materials such as sheet metal or plastic plates as shown in FIG. 3, but as shown in FIG. Member 5C'.

5b' may also be configured. Moreover, the conveyance path 5 may be constructed of a continuous arc-shaped plate.

Effects of the Invention According to the present invention, since the distance between the photosensitive material 1 and the fixing device 4 can be made smaller than the length of the sheet in the feeding direction, the overall size of the copying machine can be made smaller. Also, by not using a vacuum conveyor.

The cost can be reduced accordingly0

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
FIG. 2 is a schematic explanatory diagram showing the path of paper, FIG. 2 is an explanatory diagram of the configuration of the main parts, FIGS. The figure is a schematic explanatory diagram showing a conventional example. 1 is the photosensitive material, 4 is the fixing device, and 5Fi conveyance path. Figure 1 Figure 2

Claims (1)

[Claims] Between the photosensitive material 1 with a feeding speed of V_1 and the fixing device 4 with a feeding speed of V_3 (however, V_3≧V_1), the intermediate part is bent downward so that the distance is longer than the straight line distance between the photosensitive material 1 and the fixing device 4.
Further, a paper transport path in a copying machine is characterized in that a transport path 5 which is shorter than the length of the paper is interposed.