JPH054746A - Sheet material conveyor device - Google Patents

Abstract

PURPOSE:To provide a device for conveying sheet material correctly at the specified timing without forming sheet material into a loop. CONSTITUTION:There are provided a detecting means S1 for detecting conveyed sheet material S, and a control means 300 for controlling the timing of conveying the sheet material S into a specified position on the basis of a signal from the detecting means S1. The sheet material S can be thereby conveyed calmly and correctly without being formed into a loop as in the existing way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material conveying device for conveying a sheet material to a predetermined position at a predetermined timing.

[0002]

2. Description of the Related Art Conventionally, a device for laminating originals,
Many copying machines, automatic document feeders, and the like are required to convey sheet materials at predetermined intervals and timings in accordance with preceding documents and copied images.

In the conventional apparatus as described above, a registration roller is generally used in order to meet such requirements.
For example, after a sheet of paper as a sheet material is fed, it is abutted against a registration roller arranged on a conveying path to form a loop of the sheet, and then timing is set to satisfy the above requirement.

[0004]

However, in such a conventional technique, the sheet material is attached to the registration roller, a loop is formed, and then the sheet material is re-supplied all at once to form the sheet material at a timing. Therefore, it has the following problems. That is, (1) a loop is formed in the sheet material and the loop material is eliminated at once, so a loud noise is generated when the loop is eliminated.

(2) Since there are various kinds of sheet materials to be conveyed, and the materials thereof are different, the conveyance accuracy is lowered if loops are formed under the same conditions.

(3) Since the loop is formed, the sheet material is damaged.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to provide means for detecting the conveyed sheet material and to provide a signal from this detecting means. By providing a control means for controlling the conveyance timing to a predetermined position on the basis of the sheet material, a sheet material conveying device capable of quietly and accurately conveying the sheet material without forming a loop in the sheet material as in the conventional case. To provide.

[0008]

In order to achieve the above object, according to the present invention, a conveying means for conveying a sheet material in a predetermined direction, a detecting means for detecting the conveyed sheet material, and the above detecting means. And a control means for controlling the drive means in response to a conveying distance from the leading edge of the sheet material to a fixed position to reach the sheet material.

The control means has a clocking means for starting counting after the leading edge of the sheet material has passed,
It is possible to control the timing of the transportation by stopping and driving the transportation means.

Further, the control means has a timing means for starting counting after the leading edge of the sheet material has passed, and controls the transportation timing by adjusting the transportation speed of the sheet material by the transportation means. Good.

[0011]

The conveyed sheet material is detected by the detecting means. This detection signal is sent to the control means. The control means calculates the transportation timing from the position where the sheet material should reach and the current position, and controls the driving means to reliably and quietly transport the sheet material.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 1 shows an example in which the sheet material conveying apparatus according to the first embodiment of the present invention is applied to a copying machine.

In the figure, reference numerals 100 and 101 denote two pairs of conveying rollers, which are rotated in the direction of the arrow by a motor M1 as a driving means. S1 disposed between the pair of conveying rollers 100 and 101 is a line sensor as a detecting means for detecting the presence or absence of the sheet material and the position of the leading edge.

Reference numeral 200, which is arranged downstream of the pair of conveying rollers 100 and 101, is a transfer drum for copying, which is rotated by a motor M2 in a direction of an arrow and transfers a read image onto a sheet material. . Incidentally, 201 is a transfer alignment position of the sheet material conveyed with the transfer drum 200, that is, a fixed position to which the sheet material should arrive at a predetermined timing. S is a sheet as a conveyed sheet material.

Further, in the present embodiment, the line sensor S described above is used.
A control unit 300 that receives a signal from the control unit 1 and drives and stops the motor M1 in accordance with the transport distance to the transfer alignment position is provided.

The structure of the control circuit as the control means 300 is shown in FIG. In the figure, reference numeral 400 is a central processing unit CPU. A motor M1 is connected to the output port 600, and a clock F1 as a timekeeping means for controlling the motor M1 is connected to the input port 700, the above-described line sensor S1 for detecting the presence or absence of paper and the position of the leading edge, It is also connected to the transfer unit 500 of the copying machine.
From the transfer section of the copying machine, a paper conveyance start signal corresponding to the image position on the transfer drum 200 is input to the input port 700. The motor M2 connected to the transfer unit of the copying machine is the transfer drum 200 shown in FIG.
Is for driving.

Next, the contents of the transport control of this embodiment will be described in detail with reference to the flow chart shown in FIG. 3 and the timing chart shown in FIG.

First, the paper supplied from the cassette or the like is
When the line sensor S1 is reached after passing through the transport rollers 100 (100a, 100b), the motor M1 is stopped (S100). Then, the line sensor S1 detects the position of the leading edge of the sheet (S101). Next, a PK that notifies the image position of the transfer drum 200 from the transfer section of the copying machine.
When UP is detected (S102), calculation for timing adjustment between the image on the transfer drum and the paper is performed (S).
103) (details will be described later).

Next, the sheet refeed timing is adjusted (S104), and the motor M1 is redriven (S10).
5). If the paper has not arrived at the timing alignment position in S106, the motor M1 is continuously driven, and if it has arrived, this sequence control ends.

Here, in the control circuit 300, the calculation contents of the correction in the case where the leading edge of the sheet is displaced by "X" ahead of the fixed position 201 will be described with reference to FIG.

FIG. 6A shows a conveyance control method in the normal case, and FIG. 6B shows a conveyance control method in the case where the leading edge position of the paper is displaced from the preceding position 201 by a distance "X". ing.

That is, when the sheet precedes and stops by "X", the conveyance drive is restarted with a delay of tadj time from the timing signal PKUP indicating the image position on the transfer drum 200 (point in FIG. 6A). See P1).

Here, L: The distance between the leading edge of the sheet and the fixed position 201 in the normal state X: Distance between normal position and paper edge position V: Paper transport speed during normal operation t1: Transport loss time when paper transport is restarted K: Control loss time such as sensor detection delay time t (PKUP-0): Transport control time during normal operation Then, the transfer control time during normal operation is

[0025]

[Formula 1] t (PKUP-0) = L / V + t1 + K Becomes

The transport control time t (PKUP-X) when the leading end position of the paper is shifted by X ahead of the fixed position 201 due to variations in the paper type, drive system, etc.

[0027]

[Formula 2] t (PKUP-X) = (L−X) / V + t1 + K Becomes

Further, when the leading edge of the paper is shifted by "X", the correction time tadj of the transport control time is

[0029]

[Formula 3]     Correction time tadj = t (PKUP-0) -t (PKUP-X)                   = L / V- (L-X) / V                   =-(-X) / V Becomes

Therefore, the operation is restarted at the timing corrected for the time obtained by dividing the deviation amount by the transport speed.

In the present embodiment, by carrying out the above-described carrying control, it is possible to correct the timing of re-feeding by correcting the deviation due to the thickness of the paper (sheet material) and the variation of the load of the carrying drive system. However, it is possible to align the position of the sheet with the image on the transfer drum. that time,
It does not emit the sound of loop elimination unlike the conventional device.

7 and 8 show a second embodiment of the present invention. In the present embodiment, the carrying speed is controlled while the carrying timing is set by driving and stopping the driving means in the first embodiment.

Since the basic structure of the entire apparatus is the same as that of the above-described first embodiment as shown in FIG. 9, the same components are designated by the same reference numerals and their duplicate description is omitted. The control contents of the embodiment will be mainly described.

The contents of the transport control of this embodiment will be described in detail with reference to the flow chart shown in FIG. 7, the timing chart shown in FIG. 8 and the apparatus configuration shown in FIG.

First, the paper fed from the cassette or the like is
Wait until the line sensor S1 detects the leading edge of the paper (S
200), when it is detected, the counting of the carrier clock F1 is started (S201). Next, PKU for notifying the image position on the transfer drum 200, which is output from the transfer unit of the copying machine.
The process waits until P is detected (S202), and if PKUP is detected, the timing adjustment calculation is performed using the clock F1 (S204). Then, in S205, it is determined whether or not the speed of the motor M1 needs to be adjusted. If it is not necessary, it is left as it is, and if it is necessary, the process proceeds to S206. S206
Then, according to the result of the timing adjustment calculation (details will be described later), if the timing is early, the speed of the motor M1 is delayed (S207). If the timing is late, the speed of the motor M1 is increased to reach the alignment position 201 in FIG. Then, adjust so that the image on the drum and the leading edge of the paper match and finish the control.

The timing matching calculation for the above-mentioned conveyance control is performed as follows.

As shown in FIG. 10, when the sheet is advanced by "KX", the conveyance drive is restarted by V (X) from the timing signal PKUP indicating the image position on the transfer drum 200.

When the position of the leading edge of the paper is displaced by about "KX",
The conveyance control for adjusting the timing to the fixed position 201 is performed by calculating the sheet conveyance speed V (X) as described below. Where L is the distance between the leading edge of the sheet in normal times and the fixed position 201, KX is the distance between the leading edge of the sheet in normal times and the transport movement distance t of the clock pulse F1 × 1 pulse (PKUP-0); Conveyance control time KV (X); Assuming that the correction coefficient of the motor start-up, the sheet conveyance speed V (X) is

[0039]

[Formula 4]     V (X) = (L-KX) / t (PKUP-0) + KV (X) Becomes

Another embodiment of the correction by the speed control will be described with reference to FIG.

In this embodiment, when the leading edge of the sheet does not reach the line sensor S1 at the sheet feeding timing, the transport drive is first restarted at Vmax.

When the sheet passes the line sensor S1 with a delay of tDLY from the sheet feeding timing, the conveyance drive is re-driven from Vmax to V (X).

When the leading edge of the sheet passes the line sensor S1 with a delay of tDLY time, the conveyance control is performed by calculating the sheet conveyance speed V (X) as follows.

Where L is the distance between the leading edge of the sheet in the normal state and the fixed position 201, X is the distance between the leading edge of the sheet in the normal state t (PKUP-0), and the transport control time in the normal state tDLY; After the timing, the leading edge position of the paper is "X"
Delay time KV (X); motor start-up correction coefficient Vmax; maximum conveyance control, the sheet conveyance speed V (X) is

[0045]

[Formula 5]   V (X) = (L + X) / {t (PKUP-0) -tDLY} + KV (X) Becomes

In the present embodiment, as described above, even if the conveyance speed of the paper is changed due to the thickness of the paper, the variation in the load of the conveyance drive system, etc., the paper is conveyed so that the leading edge of the paper matches the image on the transfer drum. By controlling the speed, it is possible to accurately align the paper and the image. In addition, no unpleasant loop canceling sound is produced.

[0047]

According to the present invention having the above-mentioned structure and operation, the means for detecting the conveyed sheet material is provided, and the timing to the predetermined position is stopped or driven based on the signal from the detecting means. By arranging the control means for controlling the conveying speed, it is possible to provide a device that can stably convey the sheet material without forming a loop unlike the conventional device.

Further, since there is no loop formation of the sheet material, the device does not produce an unpleasant sound for cancellation.

Furthermore, since the space for forming the loop can be omitted, the device can be made compact.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example in which a sheet material conveying device according to a first embodiment of the present invention is applied to a copying machine.

FIG. 2 is a diagram showing a configuration of a control circuit as a control means of the embodiment.

FIG. 3 is a flowchart showing the control contents of the same embodiment.

FIG. 4 is a time chart showing the control contents of the embodiment.

FIG. 5 is a diagram showing a device configuration for explaining timing adjustment in the embodiment.

6A and 6B are views for explaining the timing adjustment of the embodiment, FIG. 6A is a diagram showing a relationship between a movement distance and time in a normal state, and FIG. 6B is a movement when a sheet precedes. It is a figure which shows the relationship between distance and time.

FIG. 7 is a flowchart showing the control contents of the second embodiment of the present invention.

FIG. 8 is a time chart showing the same example.

FIG. 9 is a diagram for explaining a conveyance speed control of the embodiment.

FIG. 10 is a diagram showing a relationship between a moving distance and time when a sheet precedes in the embodiment.

FIG. 11 is a diagram showing a relationship between a moving distance and time for explaining another speed control method in the case of a paper delay in the embodiment.

[Explanation of symbols]

100, 101 Transporting means (roller) M1 drive means (motor) S1 detection means (line sensor) 201 Arrival position (matching position) 300 Control means (circuit) S sheet material (paper)

Claims (3)

[Claims] 1. A conveying means for conveying a sheet material in a predetermined direction, a detecting means for detecting the conveyed sheet material, a signal from the detecting means, and a leading edge of the sheet material to a fixed position to reach. A sheet material conveying apparatus comprising: a control unit that controls the driving unit according to a conveyance distance. 2. The control means has timing means for starting counting after the leading edge of the sheet material has passed, and controls the timing of conveyance by stopping and driving the conveying means. Sheet material conveying device. 3. The control means has timing means for starting counting after the leading edge of the sheet material has passed, and controls the transportation timing by adjusting the transportation speed of the sheet material by the transportation means. Characteristic sheet material conveying device.