JPH0761821B2 - Special cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a special cassette, and more specifically,
The present invention relates to a special cassette that is mounted on a copying machine main body, stocks a large amount of paper, and can sequentially supply the stocked paper to a transport path of the copying machine main body.

(B) Conventional technology In the conventional special cassette, a vertically movable lift plate for placing paper inside, a paper detection switch for detecting the presence / absence of paper on this lift plate, and a lift plate It has a driving means for moving it, a level switch for detecting the rising position of the lift plate, and a control section. When the paper detection switch detects that there is no paper, the drive means lowers the lift plate to the home position in the cassette, and when the paper is replenished, it moves up again. When the level switch detects that the first paper feed roller provided on the uppermost stream side inside the cassette and the topmost sheet placed thereon are in pressure contact with each other, the lift plate stops. The uppermost sheet is always urged upward by the elevating plate so as to come into pressure contact with the first sheet feeding roller. The paper fed by the first paper feed roller is conveyed to the conveyance path on the copying machine main body side through the cassette side paper feed path.

The paper feed path on the cassette side is usually provided with a first timing roller on the downstream side of the first paper feeding roller, a first switch on the downstream side of the timing roller, and a second switch on the downstream side.

In response to the trailing edge of the preceding sheet passing and the first switch changing from ON to OFF, the first paper feed roller operates to start feeding the succeeding sheet, and then the trailing edge of the preceding sheet moves to the first edge. Two
By moving away over the switch, the timer starts measuring the time in response to changing the second switch from on to off, and the first timing in response to the timer measuring the elapse of a preset time. A control unit is provided for instructing each roller to operate in order to operate the roller and carry the subsequent sheet.

Further, the control unit is controlled so that each roller is stopped after a predetermined time has elapsed from the start of sheet conveyance.
In the case of the first and second paper feed rollers, this predetermined time is
For example, the time from the start of feeding the topmost sheet to the arrival of the sheet at the first timing roller is calculated from the peripheral speed of the first sheet feeding roller, and at this time, the leading edge of the sheet comes into contact with the timing roller. After that, a sufficient amount of time is added to form a bend to prevent the sheet from skewing.

The first timing roller is configured so that it stops when the first switch on the downstream side changes from on to off, or the time until the paper is caught in the second paper feeding roller on the downstream side is calculated, and the time is calculated. It is configured to stop after a lapse of time.

The peripheral speed, the operation start timing, and the operation time of each roller are set to be unchangeable according to the corresponding copying machine used.

(C) Problems to be Solved by the Invention In the special cassette, since the peripheral speed of each roller, the operation time, and the like are constant as described above, the copying machine (main body) to be mounted is limited. In other words, conversely, under the present circumstances, it is necessary to make a special cassette for each copying machine having a different copy speed. More specifically, for example, the peripheral speed of the transport roller (first timing roller) in the special cassette is 360 mm / sec,
When the next paper feed start timing (first timing roller operation timing) is set to 100 msec after the second switch is turned off, the copiers that can handle the paper feed speed are 200 mm / sec to 270 mm / sec.
Seconds, copy speed 30 sheets / minute (A4) -40 sheets / minute (A4)
Limited to

When the speed of the main body is faster than this, if the paper is not in time for the paper feed timing of the main body at the time of continuous copying, and the speed is slower, the next paper will fall before the previous paper leaves the paper feed roller.

The present invention has been made in view of these circumstances, and one of the main objects thereof is to provide a special cassette capable of coping with a wide range of copying speeds of a copying machine (main body).

(D) Means for Solving Problems and Actions Thereof The present invention is mounted on a copying machine main body, stocks a large volume of paper, and sequentially supplies the stocked paper from the top to the conveyance path of the copying machine main body. In a possible special cassette, a first paper feed roller, a first timing roller downstream of the first paper feed roller, and a first timing roller are provided in a cassette paper feed path connected to a transport path of the copying machine body. A first switch on the downstream side of the first switch and a second switch on the further downstream side, the first switch responding to the trailing edge of the preceding sheet leaving the first switch to change the first switch from on to off. A timer is activated in response to switching the second switch from on to off by actuating the paper feed roller to start feeding the subsequent paper and then the trailing edge of the preceding paper clears over the second switch. To Start measuring time according to
In response to the timer measuring the elapse of a preset time, the first timing roller is operated and the operation of each roller is instructed so as to perform paper feeding, and each roller is instructed to stop after operating for a predetermined time. A control unit is provided, and the control unit changes the time required from the start of operation of the first paper feed roller to the second paper feed roller provided at the entrance of the transport path of the copying machine main body, thereby obtaining It is a special cassette provided with a required time changing means capable of matching the supplied paper feed speed with the paper transport speed of the copying machine main body.

That is, according to the present invention, the time required for the sheet to reach the second sheet feeding roller provided at the entrance of the conveying path of the copying machine main body from the start of the operation of the first sheet feeding roller is provided by providing the specific required time changing means. It is possible to make a special cassette that can be mounted in the copying machine main body having a wide range of copying speeds by changing the paper feeding speed obtained by changing the paper feeding speed of the copying machine main body. Further, even when the copying machine is replaced with a high-speed one or a low-speed one, it is not necessary to replace the special cassette, resulting in cost reduction. Further, since it is possible to mass-produce the special cassette, the cost can be reduced.

(E) Embodiments The present invention will be described in detail based on the embodiments shown in the drawings. The present invention is not limited to this.

1 and 2, the special cassette S is composed of a cassette body C and a coupling portion K for coupling with the copying machine body F, and the cassette body C places a sheet thereon and vertically with respect to the stay 1. Movable lift plate 11, upper and lower paper feed guide plates 26, 23 that form a paper feed path 41, and first paper feed roller 22 that sequentially feeds the paper on the vertical lift plate to the downstream side of paper feed path 41.
And the first timing roller (4, drive side) 32 on the downstream side,
A control circuit 50 is mainly provided. The special cassette further has a paper detection switch for detecting the presence or absence of paper on the lift plate 11, a drive means for moving the lift plate 11 up and down, and a level switch for detecting the raised position of the lift plate 11. (Both not shown). When the paper detection switch detects that there is no paper, the elevating plate 11 is lowered to the home position position in the cassette by the driving means, and moves up again when the paper is replenished. When the level switch detects that the first paper feed roller 22 provided on the most upstream side of the inside of the cassette and the placed uppermost paper sheet are in pressure contact with each other, the lift plate 11 is stopped. The top sheet is the lift plate
The force of 11 is always urged upward so as to come into pressure contact with the first paper feed roller 22. On the other hand, the connecting part K is a "normal cassette".
Which is a portion corresponding to the sheet feeding path A that constitutes the sheet feeding path 43 that connects the sheet feeding path 41 and the conveying path 42 of the copying machine body F.
Guide plate 3, B guide plate 2 and carrier plate guide plate 29
And a second paper feed roller 31 (non-driving side).

Further, in FIG. 2, the cassette body C is a second paper feed roller.
A paper feed path 43 between the first timing roller 4 and the first timing roller 4 is provided with a first switch 45 and a second switch 46 from the upstream side, while a conveyance path 42 of the copying machine body F is provided with the second paper feed roller 31. And a second timing roller 48 (driving side) 49 via a third switch 47 on the downstream side of the feeding roller 44 (driving side).

The control circuit 50 is the first switch in FIGS.
When 45 is turned off, the first paper feed roller 22 is operated after a predetermined time t _1, and when the second switch 46 is changed from on to off, the first timing roller 4 is operated for a predetermined time t ₂ after the set time t ₀ . Each roller can be commanded to operate, and further, a variable resistor (not shown) as a timing changing means is provided, and the drive pulse motor (not shown, but DC variable speed) of the first timing roller 4 is changed by the resistance change of the variable resistor. ) Can change the number of rotations.

On the other hand, when the third switch 47 of the copying machine body F is turned off, the second paper feed roller 44 starts to operate and operates for the required time.

Thus, when the special cassette S is mounted on the copying machine main body F and the variable resistor is manually operated according to the copying speed of the copying machine main body F, the drive pulse motor of the first timing roller 4 is set as required (voltage by the variable resistance). The magnitude of the drive pulse voltage is increased or decreased by the drop), whereby the paper feed speed by the first timing roller 4 can be made to correspond to that of the copying machine main body regardless of the copying speed of the copying machine main body. Enables smooth and continuous copying.

Here, the command to each roller by the control circuit 50 will be specifically described with reference to FIG.

First, copying of the main body F of the copying machine is started, and the second paper feeding roller
44 is turned on (T ₀ ). Thus the preceding sheet S1 is fed by the second feed roller 44 (FIG. 2 (a)), the third switch 47 is changed from OFF to ON and retracted from the conveying path (T _1). Next, as shown in FIG. 2 (b), the first switch 45 by succeeding trailing edge of the sheet S ₂ is changed from ON to OFF (T _2), the first feed roller after t ₁ a preset time
22 is turned on (T ₃ ) and turns off after a predetermined time (T ₄ ).
Further, the second timing roller (registration roller) 48 changes from OFF to ON (T ₅ ) in synchronization with the optical system of the copying machine body F, and then the second switch 46 changes from ON to OFF by the trailing edge of the paper S _2. (T ₆ ), then the preset time
After t ₀ , the first timing roller 4 changes from off to on (T ₇ ), and the next sheet S ₃ is fed for t _{2 for a} predetermined time. In this case, the first switch 45 is turned on first by the sheet S ₂ (T ₈ ), then the second switch 46 is turned on by the rear end of the sheet S ₂ (T ₉ ), and the leading edge of the sheet S ₂ is moved to the second position. The first timing roller 4 changes from on to off when it abuts on the paper feed roller 44 and is lifted in the middle (T ₁₀ ).

Here, since the paper feed speed of the first timing roller 4 is changed according to the copy speed of the copying machine main body F, it is possible to prevent the trailing edge of the preceding sheet from overlapping the leading edge of the following sheet. It can be done and it can be prevented from being significantly delayed.

Next, in the case of automatically adjusting the variable resistor as described above, as shown in FIG.
Is further provided with a copy speed detecting section 51a, and the control section 50a drives the control section 52a based on a detection output signal from this detecting section.
Signal is output to. That is, when the drive motor 53a is a direct current, a signal for changing the resistance is output to the variable resistor, and when the drive motor 53a is an alternating current, a signal for changing the frequency is output to the frequency converter, and the drive motor 53a is output by the copying machine. The rotation speed can be changed according to the copying speed of the main body. Thus, a smooth copy similar to the above case can be obtained.
As the detection unit 51a, a reed switch of a special cassette operated by a magnet installed or not installed in the main body of the copying machine is raised (the reed switch is turned on / off depending on whether the magnet is present or absent).

Unlike the above embodiment, the timer setting time from the change of the second switch 46b from on to off and the operation of the first timing roller 4b is changed according to the copy speed of the main body of the copying machine as shown in FIG. You may For example, the set time may be set in pulses and the pulse setting switch may be manually operated according to the copying speed of the copying machine body.

Further, as shown in FIG. 6, a control unit (CPU) 50c is further provided with a copying speed detecting unit 51c of the main body of the copying machine, and the pulse setting switch is operated from the control unit 50c based on a detection output signal from this detecting unit. A signal may be output and the rotation speed of the drive motor of the timer may be changed, or the setting of the timer may be changed.

Of course, if the timer setting time can be changed according to the copying speed of the copying machine body as described above, the setting time of the timer should correspond to the copying machine with the highest (possible) copying speed. Sometimes, the value is set to be the shortest value (0), and for a copying machine having a copying speed lower than that of the fastest copying machine, the set time of the timer may be set longer corresponding to the copying speed of the copying machine.

(F) Effects of the Invention According to the present invention, the special cassette can be attached to the main body of the copying machine having a wide copy speed range because the means for changing the specific required time is provided, and the special cassette can be replaced when the main body of the copying machine is replaced. Is unnecessary, and the mass production of special cassettes is possible, which leads to cost reduction and cost reduction.

[Brief description of drawings]

FIG. 1 is a functional explanatory view showing an embodiment of the present invention, FIG. 2 is an explanatory view of a positional relationship between each roller and a switch, FIG. 3 is a time chart of each roller and a switch, and FIG. 4 is another embodiment. 3 corresponding to FIG. 3 and FIGS. 5 to 6 are block diagrams showing still other embodiments. S ... Special cassette, F ... Copier body, 4 ... First timing roller, 22 ... First paper feed roller, 44 ... Second paper feed roller, 48 ... Second timing roller, 45 ... First switch, 46 ... Second switch, 50 ... Control circuit.

Claims (3)

[Claims] 1. A special cassette that can be mounted on a copying machine main body to stock large-capacity sheets and sequentially feed the stocked sheets from the top to the conveying path of the copying machine main body in the conveying path of the copying machine main body. A first sheet feeding roller, a first timing roller on the downstream side of the first sheet feeding roller, a first switch on the downstream side of the first timing roller, and a further downstream side are connected to the cassette sheet feeding path. A second switch, the first switch responding to the trailing edge of the preceding sheet leaving the first switch to turn the first switch from on to off.
A timer is activated in response to switching the second switch from on to off by actuating the paper feed roller to start feeding the subsequent paper and then the trailing edge of the preceding paper clears over the second switch. The timer starts counting the time, and the timer counts the elapsed time according to the preset time.
A control unit is provided for instructing the operation of each roller so as to operate the timing roller to perform paper feeding, and for instructing each roller to stop after operating for a predetermined time, and this control unit controls the first paper feeding roller. It is necessary to change the time required for the paper to reach the second paper feed roller provided at the entrance of the transport path of the copying machine body from the start of operation so that the paper feeding speed obtained thereby can match the paper transport speed of the copying machine body. A special cassette equipped with time changing means. 2. The first timing roller is driven by a direct current or a variable speed motor, and the required time changing means changes the peripheral speed of the first timing roller in accordance with the sheet conveying speed of the copying machine body. The special cassette according to claim 1, which is a variable resistor for changing the supply voltage of the motor or a frequency changer for changing the supply frequency. 3. A timer sets a set time from when the second switch is turned on to when the first timing roller is actuated, and the required time changing means corresponds to the sheet conveying speed of the copying machine main body. The special cassette according to claim 1, which is a pulse setting switching device that switches a setting pulse of a timer in order to change the operation timing of the first timing roller.