JPS58144036A - Paper feed method of copying machine - Google Patents

Abstract

PURPOSE:To surely feed a sheet of paper with restoring force of a loop, by tentatively stopping a point end of the paper fed from a feed roll with a positioning member to form the loop to the paper and releasing the positioning member before the feed roll is stopped. CONSTITUTION:To transcribe a toner picture formed on a surface of a photosensitive body (a) in the preceding process to a sheet of paper (d), firstly at feeding, the paper (d) in a paper tray (b) is fed by a roll (c) to a conveying passage (e) of one sheet of paper, and a point end of the paper (d) is stopped by a positioning member (f) provided on the passage (e) to curve an intermediate part of the paper (d) and form a loop d'. Then the member (f) is released to align an end of the toner picture on the body (a) to the point end of the paper (d) and put the point end of the paper (d) between a conveying roll (g) and pressing roll (h) by restoring force of the loop d'. Then with the lapse of a prescribed time after release of the member (f), the roll (c) is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a copying machine in which a paper leading edge positioning material for positioning a toner image formed on a photoreceptor and a fed paper is released immediately before the feed roll that feeds the paper stops. Toner formed on the photoreceptor [
In an electronic copying machine that has a transfer step of transferring onto a sheet of paper, as shown in FIG. In order to do this, a paper leading edge positioning member f is provided on the paper transport path g, and the leading edge of the paper d is temporarily stopped by this base material f, so that the leading edge of the toner image and the paper d are
The tips of the two are aligned. Further, the paper leading edge positioning member f is adjusted to Δ after the feed roll C stops, as shown in FIG.
t#fTry to deal with the darkness and then release it.

As shown in Figure 1, insert a loop d' into the paper d for the release song.
is generated, and using this loop d', after releasing the paper leading edge positioning member f, the leading edge of the paper d is sent between the transport roll l and the pressure roll 4.

These roll! , A to the photoreceptor a side.

However, with this method, if the paper d to be fed is thick and stiff, such as a postcard, even if the leading edge of the paper d is locked by the paper leading edge positioning material f to form a loop d', the feed roll will When the paper C stops, the loop d' of the paper d is moved by the elastic reaction force to the feed roll C@ as shown in #2 C.
Even if the paper leading edge positioning member f is released, the leading edge of the paper d will not be conveyed! The problem is that the paper d does not advance to the pressure roll and the paper d is not fed.90 This invention was made for the purpose of improving such a problem, and the paper leading edge positioning member is released before the feeding roll stops, To provide a paper feeding method for a copying machine in which the leading edge of paper is conveyed between a conveyance roll and a pressure roll, and to ensure reliable feeding of even thick paper.
An embodiment of the method of this invention will be described below with reference to FIGS. 114 and 5. Note that the arrangement of the photoreceptor 6, paper tray b, etc. is similar to that shown in Figure 1ll1, so this will also be used in the explanation. One sheet of paper d in the paper tray is sent out to the paper transport path - by Q.

The leading edge of the paper d reaches the required paper leading edge positioning member f provided on the conveyance path vc and is stopped.After that, the feed roll C rotates to feed the rear end side of the paper d, so that the middle part of the paper d is curved to form a loop d'. Next, the paper leading edge positioning member f is released so that the leading edge of the toner image formed on the photoreceptor a and the leading edge of the paper d coincide with each other, and the leading edge of the paper d, which has been formed until t, is placed in the loop d'. Transport reel with restoring force! and pressure roll A11iI, and is sandwiched between these rolls 1. After that, paper d is transferred to the transport roll! The sheet is conveyed to the photoreceptor 6@ by the pressure roll, and the feed roll C is stopped after the sheet leading edge positioning member f is released and after a waiting time of N'.

In other words, the above-mentioned stop time ΔT is from the paper leading edge positioning member f to the transport roll! If the distance from the pressure roll h to the nipping pressure S is l (see Fig. 5), it is best to set this distance t to the time Δt1 or more for the leading edge of the paper d to move, and the distance between the feeding roll C and the leading edge of the paper is The motion tine Fi of the positioning member f is as shown in FIG.

As described above, in this invention, the leading edge of the toner paper fed out by the feed roll is temporarily stopped by the paper leading edge positioning member, and the toner image formed on the photoreceptor is positioned with the paper. At the same time, a loop is formed in the paper, and then, before the feed roll stops, the paper leading edge positioning member is released, and the leading edge of the paper is sent between the transport roller and the pressure roll by the restoring force of the next loop formed in the paper. As a result, even if the paper to be fed is thick and stiff, it can be fed reliably.In addition, the operation tie of each member is controlled by the number of pulses that control each member, etc. It is also easy to implement as it only requires a strange trap.

[Brief explanation of the drawing]

#1! Figures J to 3 are clear views showing the conventional paper feeding method, Figure 4 is a mapping chart showing the operation timing of the feed roll and paper leading edge positioning member according to an embodiment of the method of the present invention, and Figure 5 is a This is an explanatory diagram of the vicinity of the paper leading edge positioning member. 06 is the photoconductor, bri paper sheet, Q is the delivery roll, d is the paper %d' is the loop, - is the paper transport path, fFi paper leading edge positioning member, ! is transport fsa-le, and le is pressurized p-le. Applicant: Fuji Xerox Co., Ltd. Representative Patent Attorney Masahiro Yonehara Patent Attorney Tadashi Flood Tokikai Harukan

Claims (1)

[Claims] The leading edge of the paper d fed into the paper tray by the feed roll C is temporarily stopped by a paper leading edge positioning member f provided on the paper transport path C, and the next toner image and paper are formed on the photoreceptor a. At the same time as positioning d, a loop d' is formed in the paper d, and then, before the feed roll C is stopped, the paper leading edge positioning member ft- is released,
The restoring force of the loop d′ transports the leading edge of the paper d into the transport roll! A method of feeding paper in a copying machine, which includes feeding the paper between the pressure rollers 46 and 46.