JPS62157151A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To separate overlapped transfer sheets from each other as a machine is continuously operated, by a method wherein a sheet feeding conveying device for a printer and the like is provided with a transfer sheet feed means, a transfer sheet conveying means formed with a drive roller and a driven roller, and a means detecting the overlapping feed of a transfer sheet. CONSTITUTION:A pickup roller 4 serving as a first means A gently presses a transfer sheet 3 to feed the sheet on the side shown by an arrow mark. A drive roller 6 and a driven roller 7, serving as a second means B, nip the transfer sheet 3, conveyed from a guide plate 5, and conveying it to a subsequent step. Rotation of the driven roller 7 is stopped in linkage with an output signal from a third means C detecting the overlapping feed of the transfer sheet, and the overlapped sheets are separated from each other. Namely, when plural transfer sheets are fed in an overlapped manner, the third means C formed with a luminous element 9 and a collecting element 10 outputs an overlap signal, and although rotation of the roller 7 is stopped by a stopper means, the roller 6 is driven as it is, and thereby, the transfer sheets fed in an overlapped manner are orderly separated from each other.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a paper feed device (hereinafter referred to as a paper feed conveyance device) of a printer, a copying machine, etc. , relates to a paper feeding and conveying device that separates and sequentially conveys multi-fed transfer sheets.

(b) Conventional technology Conventional printers and copiers, especially brick printers (in this case, information that is input sequentially must be output in real time, and even when transfer paper is fed electronically, temporary printers It is required to continue operating without stopping and performing processing.As a countermeasure for this, after detecting double feeding of transfer paper, ejecting the double fed transfer paper out of the conveyance system, I am trying to feed the paper again.

←→ Problems to be Solved by the Invention However, in the above-mentioned conventional apparatus, the double-fed transfer paper is ejected out of the delivery system, resulting in wasted transfer paper. If the transferred transfer paper is not ejected out of the delivery system and continues to operate normally, it may cause transfer failure and fixation failure.

Furthermore, in the conventional apparatus, a discharge system for the multi-fed transfer paper is required, which makes the apparatus large and complicated.

(5) Means for solving the problem The present invention aims to solve the above-mentioned problems and automatically process the multi-fed transfer paper within the system without discharging it outside the conveyance system. In the paper feeding and conveying device, a first means for feeding transfer paper stored in a cassette, and a second means for pinching and conveying the fed transfer paper, which is composed of a drive roller and a driven roller that contacts the drive roller. And downstream:
and a third means for detecting double feeding of the transfer paper, further comprising a stopper means for stopping the rotation of the driven roller of the second means, and when the double feeding signal is output based on the third means, the driven roller This is characterized in that the driven rotation of the roller is stopped and the operation of the second means is prioritized over the first means.

(E) Operation Based on the above-mentioned means, when multiple sheets of transfer paper are fed in duplicate into the layer feeding system, the third means for detecting double feeding is activated to detect the double feeding (
Output No. 2. Then, the driven rotation of the driven roller stops, but the drive roller continues to drive, so only the transfer paper that is in contact with the drive roller field is normally conveyed and used for printing. While the third means for detecting double feeding is operating, the operation of the second means takes priority over the first means, so the double fed transfer sheets are sequentially separated and conveyed.
Normal operation will continue without stopping the printer.

(to) Examples Hereinafter, the present invention will be explained according to the drawings.
An embodiment applied to a feeding device will be explained.

As shown in FIG. 1, the paper feeding and conveying device has a cassette stand 1 disposed on a machine body, and a cassette stand 1 on which transfer paper 3 is stored. Soto 2 is d+! It is placed.

Further, a pick-up roller 4 supported by the tip of an arm 41 that is vertically swingable about a shaft (not shown) gently presses the transfer paper 3 downward, and the pink-up roller 4 is rotated in the direction of the arrow. When the transfer paper 3 is driven to the side, the transfer paper 3 is fed, and constitutes a first means A. Further, a first guide 5 disposed downstream of the first means A moves down a guide for transporting the transfer paper 3 fed by the drive of the pickup roller 4 to the next step. Further, downstream of the first guide plate 5, there is a drive roller 6 that rotates as shown by the arrow.
, a driven roller 7 that is driven in contact with the drive blow 5.
are arranged, and the drive roller 6 and driven roller 7 sandwich the transfer paper 3 conveyed from the first guide plate 5.
This constitutes a second means B for conveying the sample to the next step. As will be described in detail later, when a double feed signal is output from the third means C for detecting double feeding of transfer paper, which will be described later, the driven roller 7 stops rotating in conjunction with the output signal, and the driven roller 7 stops rotating in response to the output signal. The surfaces of the drive roller 6 and the driven roller 7, which are used to transport the sheets separately, are tightly wrapped with a material having a high coefficient of friction, such as rubber. Further, a second guide plate 8 is disposed downstream of the second means B, and a third means C for detecting double feeding of one transfer paper 3 is disposed on the front end side of the second guide plate 8.
The third means C includes a light emitting element 9 made of a light emitting diode arranged on one side of the guide plate 8;
A light receiving element 10 made of a phototransistor is disposed on the other surface of the guide plate 8 so as to face it. When there is no transfer paper 3 in the third means C, this output is zero and no double feed detection signal is output, and as the number of electronic transfer papers increases, the output increases step by step, so the output signal It is possible to judge whether double feeding is occurring or not based on the size of the amount. When a double feed detection signal is output, the driven rotation of the driven roller 7 of the second means B is stopped and the double feed transfer paper is separated and conveyed, as will be described in detail later.

Note that the roller pair 1 disposed downstream of the second guide plate 8
1 and 11 are registration rollers that measure the timing during transfer, and the distance between the second means B and the roller pair 11°11 is as follows.
It is necessary to have a small amount of paper (to the extent that even when the leading edge of the shortest one of the transfer sheets used is held between the pair of rollers 11, 11, the rear end is also held between the drive roller 6 and the driven roller 7).

Then, the motor 21 of the drive roller 6 is turned off at the timing when the roller pair 11 and 11 are pinched, and
After that, it was 1 drive of Roller vs. 11, 11! The transfer paper is conveyed by the helper, but the transfer paper 3 is conveyed by the roller pair 11.
, the l/toner image formed on the photosensitive drum 12 rotating as shown by the arrow is transferred. Images 1 to 4 on the transfer paper 3 are fixed by a fixing system (not shown). Furthermore, at the timing when the transfer paper j3 is held between the roller pair 11.11, the motor 21 for the drive roller 6 shown in FIG. As a control means for controlling, for example, time control using the output signal of the three-way means for detecting double feeding, or a pair of rollers 11.
], Micro Suinosen may be placed and controlled immediately after 1.

Next, the drive system of the second means B will be explained based on FIGS. 2 and 3.

A gear 19 is provided at the end of the shaft 18 of the drive roller 6,
On the other hand, motor 21! A gear 20 that meshes with the wheel 19 is provided at the in & end. Therefore, the rotation of the motor 21 is transmitted to the gear 20.19 and the shaft 18 to drive the drive roller 6. On the other hand, A rotating body 22 having a plurality of grooves 17 is provided at the end of the shaft 16 of the driven roller 7. Further, above the rotating body 22, a shaft 23 is provided.
It is pivoted to the , and a letter-shaped stopper 15 is arranged.
L-shaped S1.

One end of the paddle 15 is pivoted on the 1H moving shaft 24 of the plunger 14, and the other end is a rod-shaped body 15' extending downward and faces the rotating body 22. 1g, r
The rod-shaped body 15' is vertically movable due to rJJ, and constitutes a stopper means 5. When the third means C for detecting the double feeding of transfer paper is activated, the printer 14 is turned off by the double feed signal which is outputted and is switched off, and at that time)8
! Auxiliary shaft 24 (for upward movement, I-shaped stop 2 bar 151.
It rotates 17 degrees counterclockwise around the f-axis 23 in the 3rd direction. Accordingly, the rod-like body 15' of the L-shaped sill 15 moves downward and falls into the flange groove 17 of the rotary body 22 and is engaged with the flange groove 17, so that the driven rotation of the driven roller 7 is stopped.

Since this embodiment has the above configuration, the cassette I-
When the transfer paper 3 is stored in the first guide plate 5 and the pickup roller 4 is driven in the direction of the arrow, the transfer paper 3 is fed and moved to the first guide plate 5.
The transfer paper is then conveyed while being held between the drive roller 6 and the driven roller 7, and reaches the third means C for detecting double feeding of the transfer paper. As shown in FIG. 4, when two sheets of transfer paper 3U and 3D are fed in duplicate and placed between the light emitting element 9 and the light receiving element 10, this state is detected by the third means C and a double feed signal is output. , are transmitted to the plunger 14. Then, since the plunger 14 constituting the stopper means 5 is turned on, the sliding shaft 2
4 moves upward, the L-shaped stopper means rotates counterclockwise about the shaft 23, and the downwardly extending rod-shaped body 15' at the tip of the L-shaped blade 15 moves downward. Rotating body 2
2, the driven rotation of the driven roller 7 is stopped. And this is the first move! 9
Since the second means B is activated +tS ahead of A, the drive roller 6 is continuously driven in the direction of the arrow by the motor 21 with the shaft 1g and tJAiI119, 20 being operated.

As a result, among the transfer sheets 3U and 3D located between the drive roller 6 and the driven roller 7, the transfer sheet 3U cannot move because it is in contact with the fixed driven roller 7, but the transfer sheet 3D cannot move. and the drive roller 6, and the transfer paper 30. Since the frictional resistance between the drive roller 6 and the transfer paper 3D is greater than the frictional resistance between the drive roller 6 and the transfer paper 3D, the transfer paper 3D that is in contact with the drive roller 6 is separated from the transfer paper 3U and is transported in the same way as in normal operation. Te roller pair 11
．． Move to 11. Then, the motor 21 of the drive roller 6 is turned off at the timing when the transfer paper 3D is clamped by the roller pair 11.11, and thereafter the transfer paper 3D is conveyed by driving the roller pair 11.11. If the drive roller 6 is to continue rotating without such control, even after the transfer paper 3D has passed between the drive roller 6 and the driven roller 7, the transfer paper 3U is still between the drive roller 6 and the fixed driven roller 7. This is because there is a risk that new troubles such as jams may occur. By performing such control, the transfer paper 3D is fed at the same timing as usual, and only the transfer paper 3U remains between the light emitting element 9 and the light receiving element 10. At this point, the plunger 14 (turns off) and when the driven roller 7 is released from the fixation, the sheet feeding and conveying device returns to its normal state as shown in FIG. 1st method A until 3U of paper runs out
Even if priority is given to the operation of the second means B, the normal state can be maintained.

(G) As described in detail, according to the present invention, the first means for feeding the transfer paper stored in the sheet I/loading means, the drive rotating body, and the drive rotating body make contact with each other. a second means consisting of a driven rotary body that grips and conveys the fed near-1; Stopper means for stopping the rotation of the driven rotors of the two means is provided, and when double feeding of the sheets 10 is detected based on the third means, the driven rotation of the driven rotors is stopped, and the stopper means stops the rotation of the driven rotors of the second means than the first means. Since priority is given to the operation, multi-feed sheets can be separated and conveyed in sequence.
Enables continuous energized operation without stopping the machine,
You won't waste Sea 1~.

In particular, it is possible to avoid transfer defects and fixation defects in a full color printer that performs multiple transfer of three or four colors. In addition, even if three or more sheets are fed simultaneously, the operation of the second means is prioritized over the first means until there are no more sheets left in the third means, so that normal operation can be achieved! A can be maintained. Furthermore, since the double feed, -1., is processed within the conveyance system, it is necessary to provide a space for the double feed, -1, to be taken out of the system.) The shallow area can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing an embodiment of the t'i sheet feeding device, Fig. 2 is a side view of the drive system of the second means, Fig. 3 (also
A front view of the drive system of the means, FIG. 4 is a partial front view showing the state of the no-j feeding device during double feeding, and FIG. 5 is a state after separating (1) feeding the electric feeding sheets in FIG. 4. FIG. A: first means (4 pickup rollers), B: second means, C third means, S stopper means,
6--drive rotating body C roller), 7-driven rotating body (roller), 9 light-emitting element, 10 light-receiving element,
14-Plan i; V, 15... L-shaped stopper, 15' Rod-shaped body extending downward, 17
S1-Blank groove. Figure 2 Figure 3

Claims (1)

[Claims] (1) A first means for feeding the sheet stored in the sheet loading means, a drive rotating body, and a driven rotating body that comes into contact with the drive rotating body, and grips and conveys the fed sheet. It is comprised of a second means and a third means provided on the downstream side of the second means for detecting double feeding of sheets, further comprising a stopper means for stopping the rotation of the driven rotary body of the second means, and based on the third means. A sheet feeding device characterized in that when a multiple signal signal is output, the driven rotation of the driven rotary body is stopped, and the operation of the second means is given priority over the first means.