JPH0256336A - Speed control device for carrying system - Google Patents

Abstract

PURPOSE:To surely make starting in a short time by making switching, from the constant speed control with a first control means at the time of the starting of a carrying system, to the driving control keeping a memory control information value with a second control means after that. CONSTITUTION:A carrying system E is normally controlled in a constant speed faster than the speed of a carrying system F with a first control means A, and when receiving a sheet G from the system F, switched to a second control means C with a switching means D, controlled based on the drive voltage or control information value memorized in a memory means B in a constant speed control action condition, and receives the sheet G with something of pulling and without a wrinkle or damage. And when the system E is started to deliver a first sheet G, the control action condition with the means A conducting the constant speed control with the means D is given, and when started to a given speed with driving in full power, switched to the controlled condition with the means C. Thus sure starting can be made in a short time.

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 send 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 is set to transfer paper slightly faster than the conveyance speed on the copying machine side. 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 paper wrinkles may occur.

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

However, considering that the paper is caught between both the copying machine's output roller and the sorter's input roller, the sorter's conveyance speed is faster than the copying machine's conveyance speed, so the sorter is forced to move at the copier's slower conveyance speed. The paper is controlled to be conveyed at a predetermined speed set by itself, and the conveyance motor is driven at full power to powerfully convey the paper. In such a state, it becomes difficult to convey the paper, resulting in adverse effects such as tearing of the edges and out of synchronization of images.

To solve this problem, it has been conventional practice to limit the conveying force on the sorter side using a slip clutch or other means.

However, such a method requires a complicated and expensive mechanism, and the slip clutch in particular lacks stability, resulting in poor conveyance and fluctuations in conveyance speed.

Therefore, the main distributor first set the sorter side to be conveyed at a constant speed, which is normally slightly faster than the copying machine, and
When transferring paper from the copying machine to the sorter, by driving the sorter with the drive voltage and current control values in the constant speed conveyance state described above, the sorter side picks up the paper while pulling the paper a little, and the paper is transferred to the sorter at a predetermined speed. We have proposed a speed control device for the conveyance system that prevents the paper from being conveyed by forcibly increasing the driving voltage and current to reach the paper, thereby preventing damage to the paper and strain on the conveyance system.

(Problem to be Solved by the Invention) However, when starting the sorter to transfer the first sheet of paper from the copying machine to the sorter, the control value in the constant speed conveyance state as described above is When the transport motor of the sorter is started, there is a problem that sufficient starting torque is not obtained against the friction and inertia of the transport system on the sorter side, and the motor does not start up quickly due to the lack of torque, and in the worst case, it does not start. Ta.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned conventional problems, and aims to provide a speed control device for a conveyance system that does not cause wrinkles or damage during transfer between conveyance systems, and can quickly start up at startup. do.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a first system that performs constant speed control to maintain the conveyance system E at a predetermined speed as shown in FIG.
a control means A; a storage means B for storing control information such as drive voltage and current during constant speed control by the first control means A;
A second control means C controls the driving state of the conveyance system so as to maintain the control information value stored in the storage means B, and the first control means A and the second control means C are switched and operated as necessary. The present invention is characterized in that it includes a switching means for switching the transport system to drive the transport system under constant speed control by the first control means A when the transport system is started.

(Function) Since the present invention has the above configuration, 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 to be faster than the transport system F. The speed is controlled at a constant speed. On the other hand, the sheet G is transferred from the conveyance system F to the conveyance system
etc., the conveyance system E is switched to the operating state by the second control means C by the switching means, and the storage means B
Since the conveyance system E is controlled based on the drive voltage and current control information values in the constant speed control operation state stored in , the conveyance system E conveys the sheet G with some tension and reaches a predetermined speed. There is no need to increase the drive current or voltage to force the conveyance at the above-mentioned constant speed. will be held.

Moreover, when the conveyance system E is stopped, the first sheet G
When starting the conveyance system E in order to receive and pass, the conveyance system E is operated by the first control means A that performs constant speed control using the switching means.
Since the motor is in a controlled operating state, it is driven at full power to a predetermined speed and activated in a short time. When the speed is started up to a predetermined speed, the second control means C is activated by the switching means as described above.
The sheet G is smoothly transferred to the receiver, and when the transfer is completed, the first control means A returns to the normal constant speed control operation state.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 2 to 8.

In this embodiment, as shown in FIGS. 2 to 4, a sorter 2 is connected to a copying machine 1.

The copying machine 1 is provided with a copy image forming section 4 on a paper feed box 3, and an automatic document feeder 6 on a document table glass 5 of the copy image forming section 4.

The copy image forming section 4 includes an optical system 8 that scans the copy surface of a document 7 on a document table glass 5, a photosensitive drum 9 on which an electrostatic latent image is formed by image exposure from this optical system 8, and this latent image. A developing device 10 converts the toner image into a toner image.
A fixing device 1 that transfers the image onto the sheet 11 and then fixes it onto the sheet 11.
It is mainly composed of 2.

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 operate at V/m(
However, the movable mirrors 15 and 16 move integrally at a speed of V/2 m. Around the photoreceptor drum 9, there is a charger 22,
The developing device 10 and transfer charger 25 of magnetic brush 2
, a separation charger 26, a second blade cleaning device 27, and an eraser lamp 28 are arranged in this order in the rotational direction of the photosensitive drum 9.

The photosensitive drum 9 is uniformly charged by the charging charger 22 as it rotates counterclockwise, 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 IO.

On the other hand, the paper feed box 3 has two paper feed sections 31 and 32, and their paper feed rollers 33 and 34 are selectively driven.
The sheets 11 stored in either one are sent out one by one to the paper feed path 35. Paper feed path 35
The sheet 11 placed in the receiver is conveyed by a conveyance roller 36, and sent to the transfer section of the photosensitive drum 9 via a register roller 37 that determines the sheet feeding timing.

In the transfer section, the toner image formed on the photosensitive drum 9 by the transfer charger 25 is transferred to the register roller 37.
The images are transferred onto the sheet 11 that is synchronously conveyed.

The sheet 11 after the transfer is sent to the fixing section 12 by a conveyor belt 42 having an air suction means 41, and the unfixed toner image on the sheet 11 is melted and fixed between a heating roller 43 and a fixing roller 44. The sheet 11 sent out from the fixing section 12 is discharged to the sorter 2 from a discharge roller 45.

The surface of the photoreceptor drum 9 after transfer is cleaned by a cleaning device 27.
The remaining toner is removed by the eraser lamp 28, and the residual charge is removed by light irradiation from the eraser lamp 28, in preparation for the next copying.

The automatic document feeder 6 includes a table 51 as a document tray on which documents 7 are stacked, and a conveyor belt device 52 and a document table glass 5 for separating the documents 7 to be copied on the table 51 one by one.
The conveyor belt device 52 conveys the incoming document 7 to a predetermined position between it and the document table glass 5 and once stops it, and the conveyance belt device 52 conveys the incoming document 7 to a predetermined position between it and the document table glass 5, and once stops it, the image for copying is transferred. After being exposed to light, it is discharged onto 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, a gate part 65 that is driven by a gate motor 64 and is movable vertically along the bin assembly 63, an endless belt,
A gate section 6 that includes an end belt and is driven by a conveyance motor 66 to move the copy sheet 11 from the receiving section 61.
It mainly consists of a conveying section 67 for conveying up to 5.

A light-transmissive discharge sensor 71 is provided at the feed-out portion of the gate portion 65 to detect discharge of the sheet 11. Further, a home position sensor 72 is provided to detect that the gate portion 65 is at the top position.
A reference signal is provided when the gate portion 65 is driven by the gate motor 64. The conveyance section 67 includes a motor pulse generation section 74 (not shown in FIG. 2, see FIG. 4) that generates pulses with a frequency corresponding to the rotational speed of the conveyance motor 66. Microcomputer 81 (4th pulse) controls sorter 2
(see figure) to control the drive of the transport section 67. Reference numeral 73 denotes a light transmission type empty sensor that detects the presence or absence of a sheet on the bin assembly 63.

The sheet 11 discharged from the discharge roller 45 of the copying machine 1 is received in the receiving section 61, passes through the conveyance section 67, and is sent out from the gate section 65 to an arbitrary bin 62 in the bin assembly 63. When the sheet 11 is detected by the discharge sensor 71 provided at the discharge port of the gate section 65 and it is confirmed that the sheet 11 has been completely discharged, the gate section 65 is moved to face the entrance of 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 home position facing the topmost bin 62, and the sheet 11 for the next original is distributed.
wait for distribution.

Here, the sorter 2 is normally controlled at a constant speed so that the sheet conveyance speed is slightly faster than the sheet conveyance speed in the copying machine 1. Furthermore, while the sheet 11 is involved in both the ejection roller 45 of the copying machine 1 and the receiving section 61 of the sorter 2, the drive of the transport motor 66 of the sorter 2 is switched from constant speed control to constant voltage control, so that the receiving section 61 is approximately By driving with a constant torque and setting the constant voltage to the control value for the constant speed control described above, the sheet can be conveyed easily in accordance with the slow conveyance speed of the sheet 11 conveyed by the ejection roller 45 of the copying machine 1. I'm trying to make it possible. Furthermore, the first sheet 1 from the copier 1
When starting the sorter 2 when the sorter 1 is delivered to the receiving section 61 of the sorter 2, before entering the constant voltage control, perform constant speed control to start up at full power for a short time, and then enter the constant voltage control. It is controlled as follows.

FIG. 4 shows a block diagram of a control circuit for performing such control by the microcomputer 81.

To explain this, the CPU 82 of the microcomputer 81 communicates with the CPU 84 of the microcomputer 8 (3) on the copying machine 1 side using serial signals to exchange information. The CPU 84 controls inputs from various sensors and switches, outputs to operating means such as motors and clutches,
and performs input/output between the control panel and the control panel.

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, the motor pulse generator 74 provided in the transport motor 66 of the transport unit 67, the discharge sensor 71, and the empty sensor 73. , input from set switch 75 etc., gate section 6
Output to the control terminal of the switching means 6B (1-transistor, etc.) provided between the gate motor 64 of No. 5, the transport motor 66 of the transport section 67, and the transport motor power source 69;
It performs input and output to and from the operating section 76.

As you can see, the CPU82 has built-in RAM, and the RA
The predetermined addresses of M function as memory 1 and memory 2 in the flowchart described later.

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

In the main routine of the microcomputer 81 shown in FIG.
First, in step #1, initialization is performed such as setting input/output ports and initializing memory and registers.

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

In step #3, the sea ! during transportation and on the bin 62! −
11 states are checked and processing is performed according to each state. 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 6G of the sorter 2 is controlled, and the process returns to step #2. The transport control subroutine of step #5 will be explained in detail below with reference to FIGS. 6 to 8.

In the conveyance control subroutine of FIG. 6, first step #1
In step #1, it is determined whether or not the sheet 11 has been fed from the copying machine 1 to the sorter 2. If the sheet has been fed, step #1
The counter is incremented at 2 and the process proceeds to step #13. This counter manages the number of 110 sheets being transported, and is incremented when the sheet 11 is fed and decremented when the sheet is discharged from the sorter 2. Step #13
Then, it is determined whether or not the sheet 11 is being ejected from the copying machine 1 to the sorter 2. If the sheet 11 is being ejected, the process moves to step #14; otherwise, the process moves to step #18. In step #14, it is determined whether or not the transport motor 66 is being controlled. If not, the transport motor is started in step #15, and the process returns to the main routine.

When the control is in progress in step #14, it is determined in step #16 whether the start flag is 1 or not.

The start flag is set (reset) to O when the conveyance motor 66 is stopped, and is set to 1 (SERRA!-) when the transport motor 66 is started and has been raised to a constant speed. If the start flag is 0, that is, reset, the process proceeds to step #19, and constant speed control of the transport motor 66 is performed to bring the sorter 2 into a normal driving state even when the sheets 11 are being discharged to the sorter 2. I do.

If the startup flag is 1 and startup is complete, step #
At step 17, constant voltage control is performed on the conveyance motor 66 so that the sheets 11 can be transferred from the copying machine 1 to the sorter 2 without difficulty.

On the other hand, if the sheet 11 is not being ejected from the copying machine 1 in step #13, it is determined in step #18 whether or not the conveyance motor 66 is being controlled. 11 is being transported or in operation before or after that, the process advances to step #19 and normal constant speed control is performed. If not under control, return to the main routine.

After performing the constant voltage control process in step #17 or the constant speed control process in step #19, the process moves to step #20, where it is determined whether the sheet 11 has been discharged from the sorter 2,
If it is not discharged, return to the main routine,
When it is discharged, the counter is decremented in step #21 and the process moves to step #22.

In step #22, it is determined whether the counter has reached 0 or not. If it is not 0, the process returns to the main routine. If it is 0, it indicates that the sheet 11 being conveyed has run out, and in step #23, the counter returns to the main routine. Turn off the transport motor and
In step #24, the start flag is reset to 0 and the process returns to the main routine.

Next, the constant speed control subroutine for steering knob #19 will be explained based on the flowchart shown in FIG.

First, in step #31, it is determined whether or not a motor pulse has been input. If there is no input, simply return. When a motor pulse is input, the pulse width is measured by hardware inside the CPU 82, and the pulse width corresponding to the speed of the transport motor 66 is stored in a register.

In the next step #32, this pulse width data is compared with a reference value for constant speed control. If the pulse width is long, the speed is slow, so go to step #33; otherwise, the speed is fast, so go to step #40. Then, it is determined whether the respective transport motors 66 are turned on. If the conveyor motor 66 is on in step #33, it returns as is, and if it is off, that is, when the speed becomes slower than the set value as a result of maintaining the off state, steps #34 to #36 are performed for the time it was in the off state. After storing the timer value indicating this in the memory 2, the timer is restarted to measure the on-state time, the transport motor 66 is turned on, and the process returns.

In addition, when the conveyance motor 66 is off in step #40, the speed is faster than the set value, so the return is made, and when it is on, that is, when the on state is maintained and the speed increases and exceeds the set value, the step In #41 to #44, the timer value indicating the time in the on state is stored in the memory 1, and this time the timer is restarted to measure the time in the off state, the transport motor 66 is turned off, and at this time Since the conveyance motor 66 has reached the set speed and startup has been completed, the startup flag is set to 1 and the process returns. The timer here is a timer that measures the on/off time of the transport motor 66 during constant speed control, and the on/off times are stored in memory 1 and memory 2, respectively. Control is performed according to the memory contents.

Further, the constant voltage control subroutine in step #17 will be explained based on the flowchart shown in FIG.

First, in step #51, it is determined whether or not the transport motor 66 is on. If it is on, the process goes to step #52, and if it is off, the process goes to step #60. Compare with data.

If the timer value exceeds the data in the memory, the transport motor 66 is turned off or on in steps #53 and #54 or steps #61 and #62, the timer is started again, and the process returns. The timer here is a timer that controls the on/off time of the transport motor 66 in constant voltage control, and its duty is determined by the data in memory 1 and memory 2, thereby keeping the effective value of the voltage applied to the motor constant. ing.

In this embodiment, constant voltage control is performed because it can be generally regarded as constant torque control and is easy to control, but constant voltage control may also be constant current control, that is, constant torque control.

In the above embodiments, the present invention has been explained by taking the copying machine main body and the sorter as an example, but the present invention is not limited to this, but is generally applicable to mechanisms in which conveyance is transferred between different drive systems when conveying articles. applicable.

(Effects of the Invention) As is clear from the above explanation, according to the conveyance system speed control device of the present invention, when a sheet is fed from a slow conveyance system, constant torque control is performed by constant voltage or constant current control, etc. By switching to , it is possible to easily match the sheet conveyance state by the slow conveyance system, and it is possible to receive and convey sheets without causing wrinkles or damage to the sheets, and furthermore, the start-up is completed when the conveyance system is started. By performing constant speed control up to the maximum speed, it is possible to start up the engine reliably in a short period of time.

[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.
The figure is a block diagram of the operation control circuit, Figure 5 is a flowchart of the operation control main routine, Figure 6 is a flowchart of the conveyance control subroutine, Figure 7 is a flowchart of the constant speed control subroutine, and Figure 8 is the constant voltage control subroutine. This is a flowchart.

Claims (1)

[Claims] (1) a first control means that performs constant speed control to maintain the conveyance system at a predetermined speed; a storage means that stores control information such as drive voltage and current during constant speed control by the first control means; a second control means for controlling the drive state of the conveyance system so as to maintain the control information value stored in the means; and switching operation between the first control means and the second control means as necessary, and starting the conveyance system. 1. A speed control device for a conveyance system, comprising a switching means for switching the conveyance system so as to sometimes drive the conveyance system under constant speed control by the first control means.