JPH01294125A - Cut paper feeding table control method - Google Patents

Abstract

PURPOSE:To feed a sheet of paper stably from a feeding table by performing operation of a motor continuously and changing the feeding table over to continuous operation from intermittent operation. CONSTITUTION:Cut paper 1 is used, and if it is running short, a home position sensor 7 operates, rotating a table motor 3 as far as a specified value, and a paper delivery device 4 uplifts the cut paper 1 to a position where it is easy to be taken out. A driving system of the motor consists of a driver, a control circuit controlling this driver, and a sensor for controlling operation timing of the motor. With a paper delivery signal, the cut paper 1 is delivered by the delivery device 4, while in order to keep height of the table constant, the table motor 3 comes to operate at time intervals of t1, t2 and t3. If operating frequency of the motor becomes more than three times during a time interval t0, drive of the motor is made so as to be done in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for driving a cut paper supply table using an electric motor or the like in a printer or a copying machine that uses cut paper.

[Background of the invention]

Generally, in medium-high speed printers (non-impact) and copying machines, the cut sheets used are placed on a paper supply table that can be moved up and down.

The paper is supplied by a paper feeding device.

When the paper height of the supply table drops by a certain amount due to paper being used, a paper position sensor detects this, and a motor etc. is used to raise the table and control it so that it always maintains a constant distance from the paper feeding device. has been done. That is, the table is intermittently raised each time the paper position sensor detects that the paper position has become lower. Therefore, in this method, if the detection timing of the paper position sensor is delayed and the timing of the table rising is also delayed, the paper may not be fed out or the timing of feeding may be delayed if the distance between the paper feeding device and the paper feeding device is outside the standard. There were problems such as delays and paper jams.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to enable stable supply of paper from a supply table.

[Summary of the invention]

In the present invention, when sheet feeding is performed continuously, the motor for lifting the table adjusts the feeding speed to
The motor control method has been devised so that it operates continuously.

[Embodiments of the invention]

As shown in FIG. 1, the cut paper supply device 9 normally includes a supply table 2 on which the cut paper 1 is placed, and a table motor 3 that drives the table. It consists of a form position sensor 7 that detects the position of paper, a form empty sensor 6 that detects when there is no paper, and an upper limit sensor 8 that detects the limit when the table is raised. In a printer or a copying machine, cut sheets 1 are taken out one by one from a cut sheet feeder 9 by a sheet feeding device 4, sent to a printing section (not shown) via a conveyor belt 5, and then printed or printed. Copying is done. When the number of cut sheets is used and running low, a form position sensor 7 operates to rotate the table motor 3 by a certain amount, and lifts the cut sheet 1 to a position where it can be easily taken out by a paper feeding device 4. In this case, the supply table will rise in a stepped manner.

An embodiment according to the present invention will be described. The overall configuration is the same as that shown in Fig. 1, and the drive system of the table motor 3, as shown in Fig. 2, includes a driver that drives the motor, a control circuit that controls the driver, and a control circuit that controls the operation timing of the motor. It consists of a sensor. FIG. 3 shows changes in the position of the supply table 2 when the table motor 3 is driven using a motor drive circuit. Figure 4.

FIG. 5 shows a chart of each operation timing. As shown in FIG. 3, the cut paper 1 is fed out by the feeding device 4 in response to the paper feed signal, and on the other hand, in order to keep the height of the table constant, t, t2, t3 are fed out.
The table motor 3 will operate at the time interval of .

Therefore, the number of times the motor operates is time t. Since the number of times during this period is three or more (in this example, the case of three times will be described), the motor is driven continuously. The motor drive timing at that time is expressed by the following equation. (Describes the case where a stepping motor is used) Step period T=t
, +t, +t, /3XN However, tl, t2, t: Drive period of the table motor N: Number of steps of the motor to raise the supply table by a specified amount (Δy). Also, the rising speed V of the supply table 2 is ■=Δy
/l/3(t+12+1.,). The supply table 2 will rise at a constant speed V.

Next, as shown at timing ta in FIG. 4, when the paper feeding signal disappears or the form empty sensor is activated (signal S), the raising of the supply table 2 is stopped. (See ■ in Fig. 3.) Fig. 5 shows a timing chart for the case where the above-mentioned rising speed of the supply table 2 does not match the feeding speed of the paper, and in this case,
Form position sensor 7 (signal S1) or upper limit sensor 8 (signal S3) operates 9 In this case, the continuous drive of table motor 3 is stopped, the conventional intermittent drive is restored, and the number of operations of table motor 3 is reduced. It will be counted. (See ■ in Figure 3.) [Effects of the Invention] According to the present invention, when paper feeding is performed continuously, the paper feeding table also adjusts to the feeding speed.
Since it operates continuously and the distance between the feeding device and the paper can always be kept constant, the paper can be fed stably.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the cut paper supply device, Fig. 2 is a block diagram of the drive system of the table motor, Fig. 3 is a graph showing the operation timing of the supply table according to the present invention, and Figs. 4 and 5 are each It is a timing chart of a signal. In the figure, 1 is a cut paper, 2 is a supply table, 3 is a table motor, 6 is a form empty sensor, 7 is a form position sensor, and 8 is an upper limit sensor. Name of patent applicant Hitachi Koki Co., Ltd.

Claims (1)

[Claims] In a cut paper supply device that continuously supplies cut sheets to a printing device, a table drive motor controls the height of the cut paper supply table within a certain range from the paper feeding device, and also controls the number of motor operations. A cut paper supply table control method characterized in that when a certain number of times or more is reached within a unit time, a motor is operated continuously and the supply table is switched from intermittent operation to continuous operation.