JPS6227244A - Bisurface copying machine - Google Patents

Abstract

PURPOSE:To make it possible to align the leading end of a sheet of paper with a simple arrangement, by providing low speed rollers for clamping the trailing end of a sheet of paper just before completion of storing of the paper sheet to decrease the speed of the paper sheet in a conveying section for storing the paper sheet into an intermediate tray which is inclined so that its paper feed port is directed downward. CONSTITUTION:A paper sheet 12 which has been accelerated is further accelerated by means of a reversing roller 10 and rollers 16, 17, and then passes through between low speed rollers to be stored into an intermediate tray 5 at a speed equal to the peripheral speed of the reversing roller 10. Further, when the trailing end of the paper sheet 12 passes by a microswitch 18 which therefore, turns on a solenoid 19, a follower roller 14b approaches the low speed drive roller 14a, and therefore, the trailing end of the paper sheet is clamped between the rollers 14 while the speed of the paper sheet is lowered to the peripheral speed of the low speed drive roller 14a. Accordingly, the rear end part of the paper sheet 12 is moderately stored into the intermediate tray 5, and then is positioned to the front end position of the intermediate tray 5 which is inclined, without passing over due to inertia, thereby it is possible to refeed the paper sheet by means of a half moon-like roller 21.

Description

[Detailed description of the invention] Technical fields> The present invention relates to a double-sided copying device equipped with an intermediate tray.

In particular, the present invention relates to a double-sided copying apparatus having a structure in which a single-sided copy sheet is stored in an intermediate tray tilted with the paper feed port downward without changing its front and back sides from the paper feed port 1+J of the intermediate tray.

<Prior Art and Its Disadvantages> Generally, a double-sided copying apparatus is equipped with an intermediate tray for temporarily storing sheets that have been copied on one side. In such a copying apparatus, alignment of the leading edges of sheets in the intermediate tray is a very important element.

FIG. 4 shows an example of a conventional double-sided copying apparatus. The paper onto which the image on the photoreceptor drum 1 has been transferred is fixed by the fixing roller 2, and in double-sided copying mode, the flapper 3 is switched to switch between 7, 7, 1 and 1. It is transported to the picking device 4. The sheet whose conveyance direction has been reversed by the switch hack device 4 is fed +a into the intermediate tray 5, then fed by the intermediate 1 to the lay roller 6, and conveyed again to the copying process section, that is, the transfer section of the photosensitive drum 1. Ru. In such a double-sided copying apparatus, a roller 7.8 and a flapper 9 are provided close to the roller 7 so that the leading edge of the paper is aligned at the leading edge of the intermediate tray even if the paper size changes. When the paper size is large, such as A3 or B4, the flapper 9 is tilted so that the paper that has passed the roller 7 advances in the direction a. Further, in the case of a small size such as A4 or B5 size, the flapper 9 is set horizontally so that the sheet that has passed the roller 7 further passes the roller 8 and advances in the direction b. By appropriately setting the arrangement positions of the rollers 7 and 8 in such a structure, it becomes possible to align the leading edge of the paper at the leading edge of the intermediate tray regardless of the paper size.

FIG. 5 shows another example of a double-sided copying apparatus.

In this copying apparatus, the conveyance speed of the fixed paper is increased sequentially by a plurality of rollers, and the reversing roller 10 stores the paper in the paper feed slot of the intermediate tray (separately in the intermediate I/ray 5).The leading edge of the paper is aligned in the tray. This is done by moving the partition plate 11 placed in the tray back and forth.In other words, if the paper is large, the partition plate 11 is moved in the direction of arrow C, and if the paper is small, the partition plate 11 is moved in the direction of arrow C. The duplex copying apparatus moves in the d direction.Since such a double-sided copying apparatus does not have a switch-hack mechanism, it has the advantage of being suitable for high-speed operation.

However, in the double-sided copying apparatus shown in FIG. 4, the roller 7.
A conveyance path including 8 and flapper 9 is required, which increases the cost, and the switch bank mechanism has the disadvantage that high speed cannot be achieved. Furthermore, although the double-sided copying apparatus shown in FIG. 4 is suitable for high speed operation, the partition plate 1
The moving range of the paper is long, and after the paper is moved, a mechanism is required to push the stored paper toward the leading edge with a slight force, which has the disadvantage that the mechanism becomes clumsy.

<Object of the Invention> The object of the present invention is to provide a double-sided copying apparatus suitable for high-speed operation as shown in FIG. The purpose of this invention is to provide a copying device.

<Structure and Effects of the Invention> To summarize, the present invention stores paper from the paper feed port side with respect to an intermediate tray arranged diagonally with the paper feed port facing downward. In the 1st general transport section,
The present invention is characterized in that a low-speed rotating roller is provided which clamps the trailing end of the paper and lowers the one-way feeding speed just before the storage is completed.

With the above configuration, according to the present invention, even if the paper is fed at high speed, the trailing edge of the paper is pinched by the low-speed rotating rollers immediately before the paper is completely stored in the intermediate tray, so that the paper is not fed smoothly. The speed suddenly decreases and the paper is stored smoothly without going too far into the intermediate tray. Furthermore, since the intermediate tray is arranged at an angle with the paper feed port facing downward, the paper is prevented from moving in the opposite direction to the paper feed port due to inertia or the like. Therefore, there is no need for a mechanism to push the paper from the rear in the intermediate tray section, and highly accurate leading edge alignment can be performed with a very simple structure (Embodiment) Fig. 3 shows a double-sided copying device which is an embodiment of the present invention. FIG. The paper 12 that has passed through the fixing roller 2 is generally transported to the intermediate tray section by the flapper 3 in the double-sided copying mode. First, it is accelerated by the first roller group 13. This accelerated paper is then reversed by a reversing roller 10 and conveyed to the paper feed port side of the intermediate tray 5. In front of the reversing roller 10 is a low-speed rotating roller 14.
is located.

FIG. 1 shows a detailed view of this part. Reversing roller 1
Small rollers 16 and 17 are provided at the portion where the paper 12 and the paper 12 come into close contact. These rollers constitute a second roller group that further accelerates the general feeding speed of paper 1. The reversing roller 10 is driven clockwise as shown.

A microsinch 18 is arranged at the exit of the reversing roller 10, and a low-speed rotating roller 14 is further arranged in front of it. The low-speed rotation roller 14 includes a low-speed drive roller 14a that is always driven at a low speed, and a driven roller 14b that is disposed opposite to this roller 14a and rotatably attached to an arm 22 that swings around a pin 20a by a solenoid 19. It is made up of. When the solenoid 19 is turned on, the arm 20 swings clockwise about the pin 20a, and the driven roller 14b moves in a direction in which it comes into pressure contact with the low-speed drive roller 14a. The microswitch 18 is a switch that detects the trailing edge of the paper. When the trailing edge of the paper passes the position of this micro inch 18, solenoid 1
9 turns on. As a result, the driven roller 14b moves clockwise and clamps the rear end of the paper 12 between it and the low-speed drive roller 14a. In other words, the moving speed of the paper 12 suddenly decreases to the circumferential speed of the low-speed drive roller 14a. In the figure, a half-moon-shaped roller 21 provided below the tip of the intermediate tray 5 is a paper feed roller for feeding out one sheet of paper from the intermediate tray 5. As the roller 21 rotates once, the lowest sheet of paper stored in the intermediate tray 5 is fed one by one from the paper feed port 5a.

Next, the operation near the reversing roller 10 will be explained. The paper 12 accelerated by the first roller group 13 is transferred to the reversing roller 10. It reaches a second group of rollers 16, 17, where it is further accelerated.

At this time, the solenoid 19 is in an off state. Therefore, the driven roller 14b is located above the low speed drive roller 14a as shown in FIG. The low speed drive roller 14a is being driven at low speed at this time. The paper 12 accelerated by the second roller group passes through the low-speed rotating rollers 14 and is stored in the intermediate tray 5. The transport speed of the paper 12 at this time matches the peripheral speed of the reversing roller 10 of the second roller group. The trailing edge of the paper 12 has a microsweet edge 1
After passing the 8th position, the solenoid 19 is turned on.

Then, the driven roller 14b moves in the direction of the low-speed drive roller 14a, and the rear end of the paper 12 is held between these rollers. In other words, the one-time feed speed of the paper 12 rapidly decreases. The speed is the circumferential speed of the low speed drive roller 14,a. Therefore, when the trailing edge of the paper 12 passes the low-speed rotating rollers 14, it is gently stored in the intermediate tray 5, and due to inertia, the trailing edge of the paper 12 that has passed the low-speed rotating rollers 14 does not go too far behind the intermediate tray 5. It is precisely aligned with the leading edge position of the intermediate tray 5. Furthermore, since the intermediate tray 5 is arranged at an angle so that its paper feed port faces downward, the leading edges of the sheets 12 can be aligned more effectively.

FIG. 2 shows the on/off timing of the microswitch 18 and the solenoid 19. The micro-sinch 18 is turned on at point A in the figure, and turned off at point B. At this point B, the solenoid 19 is turned on, and after a certain period of time has passed, it returns to its original off state. Note that this time t is set by a timer.

As described above, in this double-sided copying device, the trailing edge of the paper is detected by the microswitch 18, and the trailing edge of the paper is nipped by the low-speed rotating roller 14 based on the detection signal, so that the single-sided copy after fixing is The finished sheets can be stored in the intermediate tray 5 at high speed, and can be stored gently and accurately without going too far into the intermediate tray.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of the main parts of a double-sided copying apparatus according to an embodiment of the invention, FIG. 2 is a timing chart of a microsinch and a solenoid, and FIG. 3 is a schematic structural diagram of the double-sided copying apparatus. 4 and 5 are schematic structural diagrams of a conventional double-sided copying apparatus. 5 - intermediate tray, 12 - paper, 14 - low speed rotating roller, 14a - low speed drive roller, 14b - driven roller, 18 - micro switch, 19 - solenoid. Fig. 1 12; Paper 14° A rotation row 14 Q° A 6 Kenki Kan O - U 14b: 11 ho - U 18 Maiu O switch odd 19 - Renoid Fig. 2 A B Paper push Out of stock J7F Exit Figure 4 Figure 5

Claims (3)

[Claims] (1) It has an intermediate tray arranged at an angle with the paper feed port facing downward, and the single-sided copied paper after fixing is temporarily stored in the intermediate tray from the paper feed port side of the intermediate tray without changing the front and back sides. In a double-sided copying device, in which the paper is reversed from front to back after being fed, and conveyed to the copying process section again to perform copying on the back side, the paper is transferred to the paper storage transport section of the intermediate tray just before the storage is completed. A double-sided copying device characterized by being provided with a low-speed rotating roller that clamps the end portion to reduce the conveyance speed. (2) The double-sided copying apparatus according to claim 1, wherein the conveyance speed of the paper storage conveyance section excluding the low-speed rotating roller is set higher than the copying process speed. (3) The low-speed rotation roller is composed of a drive roller that is driven at a low speed, and a driven roller that opposes this roller and moves in a direction that presses against this roller when the trailing edge of the paper comes onto this roller. A double-sided copying apparatus according to claim 1 or 2.