JPS5859132A - Feeder - Google Patents

Abstract

PURPOSE:To promote a drop of a sheet with empty weight and return the uppermost sheet to a regular position, in a copying machine feeder with a liftable sheet mounting bed for picture recording paper, by constituting the feeder such that after recording is ended, the loading bed is lifted minimum one time. CONSTITUTION:Copying work is started from a condition a loading bed 17 is placed in the uppermost position. In progress of copying, paper is decreased, and a signal of a detecting means 22, lower than the uppermost detecting position, is changed from 1 to 0 to rotate a motor 11 to the rising direction. Accordingly, the loading bed 17 rises, and an output signal of the detecting means 22 again becomes 1 to stop the rising. In an end of copying, with the lapse of delay time, the motor 11 is rotated to the lowering direction to lower the loading bed 17. In this way, the upper position detecting means 22 again becomes 0, and the mounting bed 17 continues to lower, then an output of a detecting means 23 changes to 1 to stop the lowering. Then the bed rises. In this turnaround time, transfer paper drops by empty weight, and the uppermost paper can be set to a regular position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding device used in a shadow forming device such as a copying machine (or recording machine).

Hereinafter, a description will be given of a feeding device of a copying machine as an example.

As a feeding device for this elm, there is a 5K shown in Figure 1.

It is known that a paper feed roller 1 is rotated in contact with a sheet stacked in a case (cassette) C, for example, a top layer of paper P, so that the paper P is fed one by one. In this case, in order to separate one sheet of paper P and prevent double feeding, separation claws 2 are provided at both corners of the front side of the paper P in the feeding direction.

However, in the above-mentioned apparatus, there is a problem in that when the rotational speed of the paper feed roller 1 is increased in order to increase the feeding speed, the second sheet P2 is fed out, albeit slightly, due to the inertia acting thereon. Therefore, a means is required to minimize the above-mentioned inertia, but even if such a means is used, the paper feed roller 1 can simultaneously touch the trailing edge of the paper above the shrimp and the leading edge of the second paper P2. Because there is an opportunity to come into contact with
The sheet of paper P2 tends to be fed out. When the second sheet of paper is sent out, the leading end of the paper P2 is caught by each separation claw 2 and bent. As a result, if the paper P2 is left as it is for a long time after copying is completed, the paper P2 may become bent, resulting in poor transfer in that area, or the paper P2 may get caught in the conveyance guide and cause a jam. This may cause inconvenience. There is a system in which the paper feed roller 1 is separated from the paper P when the topmost paper is held between a pair of feed rollers located in front of the paper feed roller 1, but when the paper feed starts, the paper is fed. Since the roller 1 is brought into contact with the paper P, there is a point in time when the position of the paper P is shifted due to the contact, and the paper cannot be fed stably.

The present invention was proposed in view of the above-mentioned problems, and after the final sheet has passed the feeding roller, the loading device is raised and lowered,
It is an object of the present invention to provide a feeding device that can thereby encourage the sheet to fall under its own weight and return the sheet to a substantially normal position, such as the first sheet.

An embodiment of the present invention will be described below with reference to the drawings.

First, the feeding mechanism will be explained with reference to FIGS. 2 and 6.

In FIG. 2, the paper feed roller 6 consists of a center roller w65 and a rubber layer 6 that is in contact with the outer peripheral surface of the center roller w65.
is rotatably supported on a shaft 7. A rotational force in the chronological direction is applied to the shaft 7 via a clutch from a drive mechanism (not shown). Further, reference numeral 8 denotes a pair of feed rollers, which after the paper, ie, the transfer paper P, reaches between them, start rotating in synchronization with the image on the copying machine main body side.

In the above configuration, when feeding the transfer paper P, the drive mechanism (not shown) rotates the shaft 7 clockwise, which causes the paper feed roller 3 to rotate in the same direction to transfer the topmost sheet. Paper P1 is sent out to the left. When the transfer paper P1 is sandwiched between the pair of feed rollers 8, the clutch is disengaged, and the transmission of rotational force from the drive mechanism to the shaft 7 is cut off, and the shaft 7 stops rotating.

Next, as shown in FIG. 6, the transfer paper P1 is sent by a pair of feed rollers 8, and as the transfer paper P1 moves, the paper feed roller 6 rotates clockwise due to the frictional force between it and the transfer paper P1. When the rear end of the uppermost transfer paper P1 is about to pass the paper feed roller 3, the paper feed roller 6 comes into contact with the second transfer paper P2, so that the second transfer paper P2 passes the paper feed roller 6, it tends to be fed out slightly due to the feeding force.

Therefore, one embodiment of the present invention described below aims to improve the problems of the conventional device as described above, and when feeding is completed, the loading platform is automatically lowered and then raised. It provides equipment.

A more detailed explanation will be given below with reference to the drawings.

FIG. 4(a) schematically shows the mechanism of the feeding device, and FIG. 4(b) shows the force transmission system and signal flow.

In this mechanism, a loading table 1 on which transfer paper P is loaded
7 is provided to be able to be raised and lowered, and a motor 11 is used to move the loaded object 17 up and down. motor 1
A sprocket 14 is formed coaxially with the worm wheel I/16 that meshes with the worm carrier 12 attached to the output shaft of the loading platform. 17 is attached to this chain 16.

A paper feed roller 3 is in contact with the transfer paper P, and the transfer paper is fed out by rotation thereof, and is fed into the process of the copying machine between the pair of feed rollers. Further, in order to detect the uppermost position of the transfer paper P, a means 22 is provided for detecting a change in the top of the transfer paper 1i [K feeding lever 21 is in contact with the uppermost part of the transfer paper P. When the transfer paper P is sent out one by one and the height of the top layer becomes lower, the motor 11 is rotated by a signal from the detection means 22, and the worm wheel 16 is rotated in the direction of arrow A to raise the loading platform 17 and keep it constant. When the motor 11 reaches this position, the signal from the detection means 22 is cut off and the motor 11 stops. When lowering the loading platform 17, the motor 11 is rotated in the opposite direction, and the worm wheel 14 is rotated in the direction of arrow 8. When the lower detection means 25 of the loading platform 17 confirms that the lowering has been completed, the motor 11 is stopped. In this embodiment, in such a device, a timer built in one copying machine is activated when the copying machine stops after copying a set number of sheets, or when the copying machine also stops due to paper knots, etc. After 15 seconds have elapsed since the last paper was discharged from the machine by means (not shown), the motor 11 rotates in the direction of arrow B and lowers the loading table 17.

When the lower detection means 25 detects the completion of the lowering, the motor 11 rotates in the direction of the arrow again and rises to the loading platform 17.

During this time, the transfer paper P2 shown in Fig. 6 falls under its own weight, and when it rises again, the quality at both ends of the claw is resolved, which means that the next time paper feeding is started, there will be no transfer defects. Problems such as jams do not occur. In addition, by using a timer or the like, it is possible to prevent time loss such as not being able to start feeding paper while the loading platform 17 is being raised and lowered 15 seconds after the copying machine has stopped. Since plastic deformation due to the deflection shown does not occur, plastic deformation due to the generated deflection can be completely prevented.

Further, a circuit diagram and a time chart of this embodiment are shown using FIG. 7 and FIG. 8.

In Fig. 7, CPY is a signal inputted from a copying machine or the like to which the present invention is applied, and is a signal that roars during the object operation. 22 and 26 are the above-mentioned uppermost detection means,
When the lower detection means both detect the position, “1” is detected.
” is output.

Further, 51 is a timer that delays the fall of the CPY signal by about 15 seconds, 52 and 56 are inverters, and 54 is a flip-flop that detects the rise of the signal and sets or resets the output. Furthermore, 55 and 56 are transistors that drive the relay 57 and motor 59, respectively, and 57-1 and 57-2 are contacts of the relay 57.

Further, FIG. 8 is a time chart showing the relationship between each input signal and output signal, and A-B-C are signals corresponding to the symbols in FIG. 7.

The operation will be explained below.

First, before the copying operation starts, the loading table 17 is at the uppermost position, the detection means 22 is at 11, and the detection means 26 is at "Om" (before T1 in FIG. 8).

At this time, the input No. 16 of transistors 55 and 56 is '
0", so both are OFF. Next, the copying operation begins and the CPY signal is input, the signal at point A changes from "1" to 0°, but the flip-flop 55 is triggered at the rising edge. Therefore, the output remains "0'' and the transistor 55 is turned off. During the copying operation (between T1 and T4 in FIG. 8), the number of sheets of paper in the loading table 17 decreases. If it falls below the highest detection position (8th
1112~Ill, ), No. 16 of the detection means 22 is “
Therefore, the Cid number becomes "1", turning on the transistor 56, and rotating the motor 59 in the 60 direction.At this time, the loading platform 17 moves upward, and at T5, the detection means is activated again. When the signal at 22 becomes "11", the upward movement stops.

Also, when the copying operation ends at T4, the CPY signal is “0”.
'', but the timer 51 indicates that the falling time is about 15 seconds.
I'll be late. Therefore, the A signal rises to "1m" approximately 15 seconds after the CPY signal becomes "0"('l'4-
'1'5).

At which rising edge, the flip-flop 54 is set and outputs 1 to output B (T5). Therefore, the transistor 55
turns on, drives relay 57, and diode 5
Rotate the motor 11 through B. At this time, since the relay 57 is operating, the contacts 57-1 and 57-2 have moved to the normally open contact side, and the motor 11 is applied with a voltage in the opposite direction and rotates in the direction 61 to move the loading platform 17. Move downward.

Then, when the loading platform 17 moves downward, the signal of the upper 'detecting means 22 becomes "0" and the transistor 56 turns on, but since the transistor 55 is ONL, it moves further downward (between Ts and Ty). . When the loading platform 17 further descends and the lower detecting means 23 outputs 1" at T7,
A reset input is input to the flip-flop 54 and its output is reset.

Therefore, the B signal returns to "0'" at T7, the transistor 55 becomes oyy, and therefore the relay 57 also becomes OFF.

However, since the upper level has not been reached, the output of the upper level detection means 22 remains at 0'', the transistor 56 is turned on via the inverter 52, and the loading platform 17 moves upward (between T7 and T8). When the loading platform 17 reaches the upper position, the position detection means 22 becomes "1", and T8 is activated to stop the ascent.
), wait for the next copy operation. Also, 15 seconds after the copying operation is completed.
If the copying operation is started again before ec elapses, T
Return to step 1 and perform the same operation.

As explained above, after a certain period of time (approximately 15
sec) After the elapse of time, the paper feed table can be moved back and forth once.

In this embodiment, the lower detecting means 2 of the loading table 17 is normally located at a position where paper can be replenished.
6, but in order to obtain the effects of the present invention,
At stations where it is sufficient that a minimum gap is created between the separation claw and the top paper so that the deflection of the top layer is corrected by its own weight, a lower detection means for when going up and down may be provided separately near the bottom of the separation claw, As a result, the time required for raising and lowering is shortened, and even if copying is started 15 seconds later by a timer, there is little loss time. In addition, the above-mentioned embodiments are
Although we have described a loading platform with a lifter, it is also possible to implement an FJR A11 cassette-type loading platform in which the entire paper storage section can be removed outside the machine, and this will be explained below with reference to FIGS. 5 and 6. do.

In FIGS. 5 and 6, a cassette for storing transfer paper P! 10 is a rotatable transfer paper support plate 51 below KAm of the transfer paper P, and a separation claw 62 separates the transfer paper support plate 61.
・It has a raw silk spring 66 that applies pressure against. Further, a cam 64 biased below the compression spring 66 is provided on the copying machine main body side, and the cam 64 can be rotated around a portion B by a motor (not shown). FIG. 5 shows the cassette loading table in a state in which paper can be fed, and the cam 64 presses the compression spring 63 as shown. In this state, copying is stopped with the transfer paper being warped, and after 15 seconds, the cam 34 is rotated once at a relatively low speed by a motor (not shown) using a timer similar to the above embodiment. At this time, as shown in FIG. 6, a gap is created between the separating claw 32 and the uppermost transfer paper, and the uppermost paper becomes free and its deflection is corrected.

In each of the above embodiments, the timer time is set to 15 seconds, but the present invention is not limited to this, and the time can be selected as appropriate.

As described above, according to the present invention, the sheet on the loading platform is raised and lowered before the bending of the sheet that occurs after feeding becomes plastic deformation, thereby making it possible to prevent failures such as jams or transfer failures.

[Brief explanation of drawings]

Figure 1 shows an example of a conventional transfer paper loading device.
FIG. 11, FIG. 2, and FIG. 6 are side views schematically showing the paper feeding mechanism, and FIG. (B) is a diagram showing the force transmission system and signal flow, Figures 5 and 6 are cross-sectional views of other embodiments, Figure 7 is a circuit diagram of this embodiment, and Figure 8 is its timing diagram. It is a chart diagram. In the figure, 11-Paper feed roller 2...Separation claw 3"-#, &t1
1...Motor 17...Loading platform 22...Means for ejecting 26...Lower detection means", '++l line

Claims (1)

[Scope of Claims] (1) A feeding device having an image recording sheet mounting table that can be raised and lowered, wherein the sheet mounting table is raised and lowered at least once after recording is completed. (2) The feeding device according to claim (1), wherein the sheet mounting table is raised and lowered after a certain period of time has passed after the end of recording. (6) The feeding device according to claim (2), wherein a timer means is used as the means for activating the lifting operation after a certain period of time.