JPS63218470A - Speed control device in conveying system - Google Patents

Abstract

PURPOSE:To prevent sheets from being damaged, by providing a first control means for controlling the speed of a conveying system at a constant speed, a memory means for storing control data during constant speed control, a second control means for controlling the drive condition of the conveying system so as to hold a condition stored in the memory means, and a change-over means. CONSTITUTION:A change-over means D changes over the operating condition from that by a first control means A to that by a second control means C in response to a timing signal delivered when a sheet G is shifted from a conveying system F to a conveying system E, and the like. Then, the second control means C reads control data such as a drive voltage, a current value in the speed control condition by the first control means and the like, from a memory means B, and controls the drive system E in conformity with the data. Accordingly, a conveying system F increases a drive current and a voltage until it attains a predetermined speed so as to prevent unreasonable conveyance, without the sheet G being conveyed unreasonably at a predetermined speed while it is left in a condition relating to the drive conveying system F, thereby it is possible to prevent the sheet from being damaged, and to avoid causing unreasonable drive of the conveying systems F, E.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a speed control device for a conveyance system that is driven faster than a preceding stage, such as a sorter connected to a copying machine.

(Prior art) In a copying machine with connected sorters, in order to transfer paper from the copying machine to the sorter, the conveyance speed on the sorter side is set slightly faster than the conveyance speed on the copying machine side, and the sorter side transfers paper slightly. Traditionally, the uke is taken with a slight pull. This is because since the drive sources for both are separate, it is difficult to match the speeds completely, and if the sorter is slower, problems such as wrinkles may occur.

Further, it is required that a single sorter model can be used by connecting to many copying machines having different conveyance speeds. For this reason, the sorter feeds back the rotational speed of its own transport motor to a microcomputer (hereinafter referred to as the microcomputer), and controls the sorter to obtain a transport speed that corresponds to the connected copying machine. However, as mentioned above, its control speed is still slightly faster than that of the copying machine.

(Problem to be Solved by the Invention) However, considering that the paper is sandwiched between the output roller of the copying machine and the input roller of the sorter, the conveyance speed on the sorter side is slightly higher than that on the copying machine side. Because of this speed, slipping occurs somewhere in both conveyance systems, making it impossible to convey the paper at the set speed. At this time, the sorter controls the paper to be transported at a predetermined speed set by itself, which is affected by the slow transport speed of the copying machine, and drives the transport motor at full power to powerfully transport the paper. do.

In this situation, it becomes difficult to transport the paper, and
This will cause negative effects such as blurring and out of synchronization of images.

To solve this problem, it has been conventional practice to limit the conveyance force on the sorter side by using a slip clutch or separating the carry-in rollers. However, these methods are complicated and expensive;
In particular, slip clutches lack stability and have many problems, such as poor conveyance and fluctuations in conveyance speed.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a first control means for constant speed control to maintain the conveyance system E at a predetermined speed as shown in FIG. A, a storage means B for storing control information such as control voltage and current during constant speed control by the first control means A, and a transport system E so as to maintain the state of the control information stored in the storage means B. The present invention is characterized by comprising a second control means C for controlling the driving state of the motor, and a switching means for switching between the first control means A and the second control means C as necessary.

(Function) The present invention has the above-described configuration. For example, when the transport system E is connected to the transport system F which is slower than the transport system E, the transport system E is normally controlled by the first control means A. By controlling the speed at a constant speed and driving at a speed that is slightly higher than that of the conveyance system F, the sheet G is slightly pulled while being fed and conveyed from the conveyance system F. It is possible to reliably prevent the occurrence of wrinkles on the sheet G between the conveyance systems F due to the slowness of the conveyance system E.

In the constant speed control by the first control means A, the conveyance in the conveyance system E is restricted while the conveyed sheet G is related to the conveyance system F, and when the predetermined speed is difficult to reach or does not reach,
In order to maintain a predetermined transport speed, the drive current and voltage of the transport system E are increased, forcing unreasonable transport.

However, if the operating state of the first control means A is switched to the operating state of the second control means C by the switching means using a timing signal or the like when the sheet G is transferred from the conveyance system F to the other side of the conveyance system, the second control means C obtains control information on the drive voltage and current in the speed control state by the first control means A from the storage means B that stores it, and controls the conveyance system E with the values according to the information.
control to drive. This prevents the conveyance system E from forcibly conveying the sheet by increasing the drive current or voltage until it reaches a predetermined speed, and the sheet G remains connected to the conveyance system F without being forced to move at the predetermined speed. There is no risk of damage to the sheet G or damage to the conveyance system F.
Things that would otherwise be unreasonable will be resolved.

(Example) An example of the present invention shown in FIGS. 2 to 4 will be described. This embodiment shows the case of a sorter 2 connected to a copying machine 1 as shown in FIG.

The copying machine 1 is provided with a copy image forming section 4 on the paper feed box 3, and the copy image forming section 4 is equipped with an automatic document feeder 6 on the document table glass 5 of the copy image forming section 4. An optical system 8 that scans the copy surface of the original 7 on the base glass 5, a photosensitive drum 9 on which an electrostatic latent image is formed by image exposure from the optical system 8, and a developing device 10 that converts this latent image into a toner image.
, and a fixing device 12 that transfers this toner image onto a copy sheet 11 and then fixes it on the copy sheet 11.

The optical system 8 scans the copying surface below the document table glass 5, and includes an exposure lamp 13, a movable mirror 14 as a scanner, and a movable mirror 15.1 for optical path length correction.
6, an imaging lens 17, and a fixed mirror 18. The exposure lamp 13 and the movable mirror 14 are (V/m) with respect to the circumferential speed (■) of the photoreceptor drum 9 (constant regardless of whether the magnification is the same or variable magnification) (where m: copying magnification)
The movable mirror 15.16 moves integrally at a speed of (V
/ (2m)). Around the photoreceptor drum 9, a charging charger 22, a magnetic brush type developing device 10, a transfer charger 25, a separation charger 26, a cleaning device 27 for the second blade, and an eraser lamp 28 are arranged in order in the rotational direction of the photoreceptor drum 9. has been done.

As the photosensitive drum 9 rotates counterclockwise, it is uniformly charged by a charging charger 22, and receives image exposure from the optical system 8 to form an electrostatic latent image. This electrostatic latent image is developed into a toner image by a developing device 10.

On the other hand, the paper feed box 3 has two paper feed sections 3L and 32, and their paper feed rollers 33 and 34 are selectively driven to feed the sheets 11 stored in either one one by one onto the paper feed path 35. It is designed to be sent to. The paper feed path 35 transports the received sheet 11 by transport rollers 36 each having a registration roller pair 37 that determines the paper feed timing.
The image is sent to the transfer section of the photoreceptor drum 9 via.

In the transfer section, the toner image formed on the photosensitive drum 9 by the transfer charger 25 is transferred to the registration roller pair 3.
7 and onto a sheet 11 that is synchronously conveyed.

The sheet 11 after the transfer is sent to the fixing device 12 by a conveyor belt 42 having an air succilon means 41, and the unfixed toner image on the sheet is transferred to a heating roller 43 and a fixing roller 4.
It is designed to melt and fix within 4 hours. The sheet 11 sent out from the fixing device 12 is discharged to the sorter 2 from a pair of discharge rollers 45.

On the other hand, residual toner is removed from the surface of the photoreceptor drum 9 after the transfer by a cleaning device 27, and an eraser lamp 28
The remaining charges are removed by light irradiation and the paper is prepared for the next copying.

The automatic document feeder 6 has a table 51 as a document tray on which documents 50 are stacked, and a document tray 51 on which documents 50 are stacked, and a document 7 to be copied on the table 51.
The conveyor belt device 52 separates the originals 7 one by one and feeds them between the conveyor belt device 52 and the document table glass 5. It is conveyed to a predetermined position and once stopped, subjected to image exposure for copying, and then discharged to the discharge tray 54.

The sorter 2 is connected to the right side of the copying machine 1 in FIG. This sorter 2 includes a receiving part 61, a bin assembly 63 having a plurality of vertical bins 62, and a gate motor 64.
includes a gate part 65 that is driven by a conveyor motor 66 to move vertically along the bin assembly 63, an endless belt, and an end belt, and is driven by a conveyor motor 66 to move the sheet 1 vertically along the bin assembly 63.
1 from the receiving section 61 to the moving gate section 65.

A light-transmissive discharge sensor 7 is provided at the delivery portion of the gate portion 65.
1 is provided so that the sheet 11 to be discharged can be detected. A home position sensor 72 is provided to detect that the gate section 65 is at the top position, and is configured to provide a reference signal when the gate section 65 is driven by the gate motor 64. The conveyance unit 67 includes a motor pulse generation unit (not shown) that generates pulses with a frequency corresponding to the rotational speed of the motor 66, and the pulses generated thereby are used to control the microcomputer 81 (fourth controller) that controls the sorter 2. (Fig.) to control the drive of the conveying section 67.

11 ejected from the ejection roller pair 45 of the copying machine 1
is received in the receiving section 61 , passes through the conveying section 67 , and is sent out from the gate section 65 to the bin 62 in the bin assembly 63 . When the sheet 11 is detected by the discharge sensor 1 provided at the delivery port of the gate section 65 and it is confirmed that the sheet 11 has been completely delivered, the gate section 65 moves to the next bin 62.
The sheet 11 that has been conveyed in the same manner is sent out to the next bin 62. In this way, the sheets 11 are sequentially distributed to each bin 62, and when the distribution is completed, the gate section 65 returns to the starting position facing the topmost bin 62, and waits for distribution of the sheets 11 to the next document. .

Here, the sorter 2 is normally driven a little faster than the sheet conveyance speed in the copying machine 1, and when the sheet 11 is sent from the copier 1 to the sorter 2, the sheet conveyance speed on the sorter 2 side is slow. While preventing wrinkles, etc., only when the sheet 11 is engaged with both the ejection roller pair 45 of the copying machine 1 and the receiving section 61 of the sorter 2,
Torque control is performed by switching the drive of the transport motor 66 of the receiving section 61 of the sorter 2 from constant speed drive to constant voltage drive, and the receiving section 61 of the sorter 2 is driven by the pair of discharge rollers 45 of the copying machine l.
The sheet 11 is conveyed in a manner that matches the conveyance speed of the slow sheet 11 being conveyed, and the sheet 11 is conveyed at
5, the receiving section 61 of the sorter 2 starts transporting the sheets 11 at normal speed.

FIG. 4 shows a block diagram of a control circuit when such control is performed by the microcomputer 81. To explain this, a CPU 82 of a microcomputer 81 communicates with a CPU 84 of a microcomputer 83 of an example of a copying machine using serial signals to exchange information. Copy machine l
The microcomputer 83 on the side controls the operation of the copying machine 1 side, and its CPU 84 controls inputs from various sensors and switches, outputs to operating means such as motors and clutches, and inputs and outputs to and from the operating section. conduct.

The microcomputer 81 on the sorter 2 side controls the operation of the sorter 2, and its CPU 82 controls the home position sensor 72 and the motor pulse generator 7 provided in the transport section 67.
4. Inputs from the discharge sensor 71, empty sensor 73, set switch 75, etc., outputs to the gate motor 64 of the gate section 65, the conveyance motor 66 of the conveyance section 67, the operation section 7
It performs input/output to and from 6.

Next, actual operation control will be explained based on control flowcharts shown in FIGS. 5 to 8.

In the main routine of the microcomputer 81 shown in FIG.
First, in step #1, initial settings such as input/output port settings and memory and register initialization are performed.

Next, in step #2, input is made from the input port and the data is stored in the memory. Further, processing such as setting the mode of the sorter 2 is also performed at the same time.

In step #3, the sheet 11 is being conveyed and on the bin 62.
The status of each item is checked and processing is performed according to each status. In the next step #4, control is performed to move the gate section 65 to the discharge position according to the mode of the sorter 2.

Finally, in step #5, the conveyance motor 66 of the sorter 2 is controlled, and the process returns to step #2. The transport control subroutine of step #5 will be described in detail below with reference to FIGS. 6 to 8.

In the conveyance control subroutine of FIG. 6, first step #1
At step #1, it is checked whether or not the sheet 11 has been fed from the copying machine 1. If the sheet has been fed, the counter is incremented at step #12, and the process proceeds to step #13. This counter manages the number of sheets 11 being conveyed, and is incremented when the sheets 11 are fed to the sorter 2 and decremented when the sheets are discharged from the sorter 2. Step #1
In step #3, it is checked whether or not the motor is being controlled. If it is not being controlled, the motor 66 is started in step #14, and the process returns to the main routine.

When the control is in progress in step #13, constant speed control of the motor 66 is performed in step #16 to bring the sorter 2 into a normal driving state. On the other hand, if the sheet 11 has not been fed yet in step #11, the process moves to step #15, and if the copying machine 1 is not discharging the sheet 11 at this point, the sorter 2 still performs the process of step #16 with normal conveyance. .

If the copying machine 1 is discharging the sheet 11 in step #15, the process moves to step #17, where constant voltage control of the transport motor 66 is performed, and the sheet 11 is smoothly transferred from the copying machine 1 to the sorter 2. do it like this.

After performing either the constant speed control process in step #16 or the constant voltage control process in step #17, the process moves to step #18, where it is checked whether or not the sheet 11 has been ejected from the sorter 2. If the sheet 11 has not been ejected, The process returns to the main routine, and when the liquid is discharged, the counter is decremented in step #19 and the process proceeds to step #20.

In step #20, it is checked whether the counter has reached "0", and if it is "0°", the sheet 11 being conveyed
The motor 66 is turned off in step #21 and the process returns to the L main routine.

Next, in FIG. 6, the constant speed control subroutine at step #16 will be explained based on the flowchart shown in FIG.

First, in step #31, it is checked whether a motor pulse has been input. If there is no input, simply return. When a motor pulse is received, the pulse width is measured by hardware within the CPU 82 and stored in a register.

In the next step #32, this pulse width data is compared with a reference value for constant speed control, and if the pulse width is long, the process goes to step #33, and if not, the process goes to step #40, and the conveyance motor 66 is turned on. Check if it is. If the transport motor 66 is ON in step #33, return; if the leaf is F, store the timer value in the memo I72 in steps #34 to #36, restart the timer, turn the transport motor 66 to 0IJL, and return. do.

Also, if the transport motor 66 is OFF in step #40, return; if it is ON, store the timer value in the memory 1 in steps #41 to #44, restart the timer, and turn the transport motor 66 to F. Return. The timer here determines whether the transport motor 66 is ON or OFF during constant speed control.
A timer for measuring the FF time is used to store the 0N10FF time in the memory 1 and the memory 2, respectively, and control is performed according to the contents of the memory during constant voltage control, which will be described later.

The constant voltage control subroutine at step #17 in FIG. 6 will be explained based on the flowchart shown in FIG.

First, in step #51, it is checked whether the transport motor 66 is turned on, and if it is turned on, the process proceeds to step #52.
When it is OFF, the process advances to step #60 and the respective timer values are compared with the data in memory 1 or memory 2. If the timer value exceeds the data in the memory, the transport motor 66 is turned off or turned on in steps #53 and #54 or steps #61 and #62, the timer is restarted, and the process returns. The timer here is a timer for controlling the 0N10FF time of the transport motor 66 in constant voltage control, and its duty is determined by the data in memory 1 and memory 2.

In this example, the case where switching between constant speed control and constant voltage control is explained for ease of implementation, but constant voltage control may also be performed with constant current control, that is, constant torque control, and in this case, This can be said to be more in line with the original purpose.

(Effects of the Invention) Since the present invention has the above-described configuration and operation, when a sheet is sent from a conveyance system that is slower than the own side, the own side switches to constant torque control using constant voltage or constant current control. sheet a by the slow conveyance system
It is possible to easily match the sheets before sending them and to receive and convey the sent sheets without any problems due to the difference in control speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a diagram showing one embodiment of the present invention in which a copying machine and a sorter are connected and used, FIG. 3 is a schematic side view of the drive mechanism of the sorter, and FIG.
5 is a block diagram of the motion control circuit, FIG. 5 is a main routine for motion control, FIG. 6 is a flowchart showing the conveyance control subroutine in the main routine in FIG. 5, and FIG. 7 is a flowchart showing the constant speed control subroutine in FIG. The flowchart in FIG. 8 is the constant voltage control subroutine in FIG.

Claims (1)

[Claims] (1) The first constant speed control to keep the conveyance system at a predetermined speed.
a control means; a storage means for storing control information such as drive voltage and current during constant speed control by the first control means; and a drive state of the transport system so as to maintain the control information values stored in the storage means. 1. A speed control device for a conveyance system, comprising: a second control means for controlling; and a switching means for switching between the first control means and the second control means as necessary.