JPS60116277A - System for detecting moved quantity - Google Patents

Abstract

PURPOSE:To accurately detect the moved quantity of a moving body in a delayed time of a detecting means, by combining the 1st and 2nd means with the detecting means. CONSTITUTION:A detecting means 31 outputs a detect signal when the prescribed part of a moving body which makes step movements comes to a prescribed position. The detection signal is given to the 2nd means 32. On the other hand, the 1st means 33 finds time interval data required for the step movement. Moreover, delayed time data existing until the detection signal is given from the detecting means 31 have been given to the 2nd means 32. The 2nd means finds the number of steps of the step movement of the moving body by going back to the past from the time when the means 32 receives the detect signal by the delayed time of the delayed time data, by referring to the time interval data from the 1st means 33. Therefore, the moved quantity of the moving body within a delayed time of the detecting means can be detected accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a movement amount detection method for detecting the movement amount of a moving object that moves in steps, such as a document in a facsimile machine.

[Technical background of the invention]

In a facsimile machine, it is desirable that the document being transported be accurately photoelectrically converted (read, !l) from the leading edge (the edge to be photoelectrically converted first) to the trailing edge (the edge to be photoelectrically converted last). . Otherwise, parts other than the document will be photoelectrically converted and transmitted, and at least a portion of the top or bottom of the document will not be photoelectrically converted and will not be transmitted. Therefore, in severe cases, there was a problem in which some of the characters and figures written on the document were not transmitted.

Therefore, the document conveyance system of the facsimile machine was configured as shown in FIG. 1 to solve the above problem. FIG. 1 is a schematic cross-sectional view of a transport system and a reading system of a facsimile machine. In the figure, 1 indicates a document table. When the original 9 is set on the original table l as shown by the dashed line in the figure, it is conveyed downward by the first feed rollers 2A and 2B.

When the leading edge of the document 9 comes to be held between the second feed rollers 3A and 3B, the document 9 is further conveyed downward. A photointerceptor is provided at an intermediate position between the second feed roller 3A and the third feed roller 4A. The photo interrupter 6 is for detecting that the leading edge and the trailing edge of the original document 9 have arrived at predetermined positions on the conveyance path 10, and is configured as shown in FIG.

The photointerchanger shown in the perspective view of FIG. 2 has a configuration in which a light receiving element 62 and a light emitting element 63 are provided on the left and right side plates of a casing 61, respectively. In addition, casing 6
A shaft 64 is provided across the left and right side plates of 1. A substantially "S"-shaped lever 65 is rotatably provided at the center of the shaft 64. In a normal state, this lever is brought into a stationary position when one end 66 of the lever is in a position where it blocks the light beam emitted from the light emitting element 63. Seven automatic interrupters 6 are provided so that the other end 67 of this lever 5 protrudes onto the transport path lo from a hole (not shown) in the transport path 10 in FIG. The leading edge of the original 9 contacts the end 67, and then the end 67 side of the lever 65 is pushed down, causing the end 66 of the lever 65 to rise and light rays emitted from the light emitting element 63. will no longer be blocked.

As a result, the light-receiving element 62 is turned on, and a microprocessor 21 (described later) that receives this on-state signal can detect the arrival of the leading edge of the original document 9.

Further, the document 9 continues to be conveyed, and the leading edge of the document 9 is pinched by the third feed rollers 4A and 4B in FIG.
continues to be transported downward. Then, when the rear end of the document 9 comes off the end 67 of the lever group of the 7-way interrupter 6,
The lever 65 performs an operation to return to its original position. As a result, the end 66 of the lever 65 is lowered, and this end 66 blocks the light beam emitted from the light emitting element 63 again. Here, the light receiving element 62 is in an off state, and the microprocessor 21 (to be described later)
Since the microprocessor 21 receives an off-state signal from the light receiving element 62, the microprocessor 21 can detect the arrival of the trailing edge of the document.

When the document 9 transported by the transport system configured as described above reaches the reading position 7 on the transport path lo,
Reading system (consists of lens and image sensor)
8, photoelectric conversion of the reflected light (image) reflected from the original 9 and reaching the reading system 8 is started.

Here, in order to accurately photoelectrically convert the document 9 from the leading edge to the trailing edge, it is necessary to
7 is known, the leading edge and trailing edge of the document 9 are aligned with the above-mentioned position of the end 67 of the lever 65 and the reading position 117.
It suffices if the speed of transport between the two is known. Since the above-mentioned running speed is known, the time from when the leading edge and trailing edge of the document 9 are detected by the photointerrupter 6 until it reaches the reading position 7 can be determined. Therefore, the microprocessor 21, which will be described later, instructs the reading system 8 to start reading after the above-mentioned period of time after receiving the detection signal that is output when the leading edge of the document 9 is detected by the photointerrupter 6. Therefore, accurate reading can be performed from the leading edge of the document 9. In addition, the microprocessor 2 described later
1 receives a detection signal output when the rear end of the original 9 is detected by the photointerrupter 6, and then instructs the reading system 8 to stop reading after the above-mentioned time, thereby detecting the rear edge of the original 9. Accurate reading can be performed right to the edge.

As for the leading edge of the document 9, the image information on the document 9 is not initially photoelectrically converted at all, and the document 9 is not conveyed at variable speed by encoding and compressing the image signal, but is continuously conveyed in steps at a constant speed. . The speed at this time is constant, and can be known from the specifications of the stepping motor. Also, the lever 65 of the photo interrupter 6! Since the #1 section 67 is pushed by the leading edge of the document 9 and cannot be pushed down due to the conveyance speed of the document 9, it is considered that there is almost no delay time until the photo interrupter 6 outputs the detection signal.

[Problems with background technology]

However, by the time the trailing edge of the document 9 is detected, the document 9
The conveyance speed of the document 9 is not constant depending on the time required for encoding and compressing the image signal read from above, and it is difficult to know the speed of the document 9. Also, when detecting the rear end of the original 9, the lever end 67 of the photo interrupter 6
However, it comes off from the rear end of the document 9 and returns to its original position due to gravity. Therefore, some time after the original actually comes off from the end 67, the light beam emitted from the light emitting element 63 is blocked by the end part of the lever 6, and the photointerrupter 6 outputs a detection signal. There will be a delay time until the This delay time is approximately 50m5e
Regarding c, it was not possible to determine how far the trailing edge of the original 9 was transported during this delay time because the transport speed of the original 9 was not constant. For this reason, the microprocessor 21 described later It is not known at what point after the photointerrupter 6 receives the detection signal output by detecting the trailing edge of the original document 9, when to instruct the reading system 8 to stop its operation. Therefore, it was possible to accurately read even the rear end of the document 9.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to reduce the delay time caused by a detection means that detects that a predetermined part of the moving body has arrived at a predetermined position when a moving body moves in steps. The object of the present invention is to provide a method for detecting the amount of movement.

[Summary of the invention]

Therefore, in the present invention, data on the time required for the moving object to move step by step until the next step is stored for each step movement, and the time data required until the moving body receives the detection signal from the detection means is stored. By referring to the data, the number of steps that the moving object has moved is calculated by going back by the delay time from the time when the detection signal was received, and it is assumed that the movement corresponding to this number of steps has been performed.

[Embodiments of the invention]

FIG. 3 is a block diagram of the main parts of a facsimile machine adopting the method of the present invention. The conveyance system and reading system of this 7-axis device are the same as those shown in FIGS. 1 and 2, and therefore their explanation will be omitted.

In FIG. 3, 2 and 21 indicate a microprocessor.

This microprocessor 21 controls each part of the facsimile machine. The microprocessor 21 is connected to a ROM 22, a RAMZ 3, I10 ports 24 and 25, and an event counter 26 via a lotus 29.

The ROM 22 stores programs and data used by the microprocessor 21. The RAM stores data required by the microprocessor 21 and is used as a working register. A photointerrupter 6 is connected to the I10 boat row. When the photo interrupter 6 detects the leading edge of the document 9, the photo interrupter 6 is turned on and a leading edge detection signal is output. The microprocessor 21 receives this via the I10 port and bus 4. Further, when the photointerrupter 2 detects the trailing edge of the document 9, the photointerrupter 6 is turned off and a trailing edge detection signal is output. The microprocessor 21 processes this as I10)24. Receive via bus 29. A stepping motor path is connected to I10 port B. The microprocessor 21 sends a rotation instruction signal to the stepping motor path via the path 29 and the I10 boat 5 to instruct one step of rotation. Every time the microprocessor 21 gives a rotation instruction signal, the event counter reads out the count value and stores it in the RAM.
23, which will be described later. The event counter 26 operates by inputting a 10 KHz clock, is reset at the same time as the count value is read by the microprocessor 21, and starts counting again. Also, the callan of the event counter 26 [value 1d, m5ec
This is unit time data. A first register 34, which will be described later, stores a count value in the RAM 23, and is configured as shown in FIG.

The first register 34 is assumed to have a capacity that is greater than somsec even when the stepping motor path rotates to the maximum when the time data of all registers are added.
In addition, it is assumed that the pointer stored in the RAM 23 is used cyclically as indicated by an arrow X by a pointer function to be described later. Furthermore, the RAM 23 includes a step number register 4, which will be described later, and a total ff1 time register 42, which are used when calculating the amount of movement. Also, delay time data (50
There is a second register 39, which will be described later, in which the data (msec) is stored. In addition, the ROM 22 stores a program that operates according to a flowchart shown in FIG. Contains the buffer management program.

Next, the functions of the microprocessor 21 will be explained with reference to FIG. In FIG. 5, 31 is a detection means,
This corresponds to the photointerrupter 6 described above. The detection signal output from the detection means 31 is given to the second means 32. The first means stores data on time intervals required for step movement, and includes a first register (hereinafter simply referred to as a register) 34, a pointer 35, a pulse detection means 36, a data writing means 37, and a counter. Become.

The pulse detection means 36 receives the rotation instruction signal applied to the stepping motor path and detects that the original 9 has been conveyed by one step. When the data writing means 37 detects that the document 9 has been conveyed by one step, the data writing means 37 reads out the count value from the counter 38 in response to the output signal, and stores the count value in the register 34 at the address indicated by the pointer 35. Store the count value in the register. At this time, the counter path is reset by the output of the pulse detection means 36. The pointer A is written by the data writing means 37.
Incremented by 1 before storing time data. still,
The data writing means 37 controls each register of the register 3/I cyclically so that the address indicated by the pointer 35 indicates the address indicated by the pointer 35. Register 34, pointer 3!5 is the third
In the RAM 23 shown in the figure, the counter path is as follows.
Equal to event counter.

The second means 32 includes a second register (hereinafter simply referred to as a register) 39 in which delay time data indicating the delay time by the detection means 31 is stored in advance, and a step number register 4.
], and has a total time register 42.

Further, when the second means 32 receives the detection signal from the detection means 31, the second means 32 retroactively adds the time data that has been obtained by the first means up to this point. It has a processing means 40 that calculates the number of steps when the added result data becomes maximum within the delay time data. Specifically, the processing means 40 operates as follows. Upon receiving the detection signal from the detection means 31, the processing means 40 issues an instruction to the data writing means 37 of the first means 33 to store the count value of the counter path in the register of the address indicated by the pointer 35. . Next, the processing means 4 reads the time data in one register of the register 34 at the address indicated by the pointer A, and stores it in the total time register 42. The processing means 40 reads the delay time data in the register 39 and compares it with the time data. Also, 1 is subtracted from the pointer 35. At this time, when the delay time data is smaller than the time data of the total time register 420, the time data of the Lujistor in the register body at the address indicated by the pointer 35 is further read out;
This is stored in the total time register 42 in addition to the previously read time data. Next, the time data resulting from this addition and the delay time data are compared in magnitude. Further, 1 is subtracted from the pointer 35 and 1 is added to the step number register 41. At this time, if the delay time data is smaller than the added time data in the total time register 42, the time data of the register 34 at the address indicated by the pointer A is further read out, and the added time data is first read out. Additionally, this is stored in the total time register 42.

The resulting time data and delay time data are compared in magnitude. Furthermore, if 1 is subtracted from the pointer 35, 1 is added to the step number register 41. Thereafter, the same operation is performed, and when the added time data is smaller than the delay time data, the above operation is stopped, and the processing means 40
1 is subtracted from the step number data stored in the step number register 41, and this is set as the step number data of the step movement. For example, if step movement is not performed, the time data when the data writing means 37 is caused to write time data upon receiving the detection signal is the maximum time data in the delay time data. Therefore, when the time data stored one step before is added to the above time data, the added time data becomes smaller than the delay time data. In the operation here in the trench, the step number data in the step number register 41 is 1,
Subtracting 1 from this gives O, which shows that no step movement was performed.

Next, the operation of the facsimile machine shown in FIG. 3 will be explained with reference to the flowchart in FIG.

First, in step 201, the microprocessor 21 monitors whether a detection signal has arrived from the I10 boat 24 indicating that the photointerrupter 6 is in an on state and the leading edge of the document 9 has been detected. When a detection signal arrives here, the process branches to YES and proceeds to step 202. In step 202, the microprocessor 21 monitors whether a detection signal indicating that the trailing edge of the document 9 has been detected while the automatic interrupter 6 is in the OFF state is received from each of the machine ports. In West Germany, the trailing edge detection signal does not arrive, so the process branches to NO in step 202, and the process proceeds to step 2.
Proceed to 03. In step 203, the microprocessor 21 refers to the image signal accumulation in an image signal buffer (not shown) and determines whether step movement is possible. If step movement is possible, the microprocessor 21
branches to YES in step 203, and proceeds to step 20.
Proceed to step 4. In step 204, the microprocessor 21 outputs a rotation instruction signal for rotating the stepping motor path by one step from the (10) boat station.

Next, the process proceeds to step 205, where the microprocessor 21 reads the count value of the event counter 26. Next, proceeding to step 206, the microprocessor @) 21
Reset the event counter 26. by this,
The event counter 26 starts counting again from the beginning. Furthermore, the process advances to step 207, where the microprocessor 21 adds 1 to the pointer 35. Next, the microprocessor 21 proceeds to step 208 and checks whether the address of the pointer is less than or equal to the most significant register of the registers 34 (in FIG. 4, the register storing time data jn-8). Here, if you want to indicate the lowest register or below, proceed directly to step 210, and if you do not want to do so, initialize the pointer 35 in step 209 so that the address of the pointer indicates the lowest register of registers 34, and then proceed to step 210. , proceed to step 210. Thus, microprocessor 21 manages pointer 35 through steps 208 and 209 to ensure that time data is stored cyclically in register 34.

Next, in step 210, the microprocessor 21
stores the register \ of the register 34 at the address indicated by the pointer A and the callan l read from the event counter 26 in step 205 as time data.

When the operation of step 210 is completed, step 20
2, and as shown in steps 202 to 210, the operation of storing time data in a predetermined register of register 340 is continued. While this operation continues, when the rear end of the document 9 comes off the end 67 of the lever 65 of the photointerchanger, approximately 50 minutes have passed since then.
After m5ec, a detection signal is output from the photointerrupter. The microprocessor 21 receives this via the bus 29 as well as the I10 boat. Therefore, the microprocessor 21 branches from step 202 to YES and proceeds to step 211. Step 211 to Step 21
Since the operations up to Step 6 are the same as those from Step 205 to Step 210, detailed explanation thereof will be omitted. However, the time data is stored in step 216 here.
The reason for -9 is to protect against cases where a detection signal arrives before the next step movement has been made even after a while has passed since the last step movement of document 9. be. For example, if the rear end of the document 9 has come off the end 67 of the lever 65 of the photointerrupter 6 due to the previous step movement, and there is no step movement at all thereafter, if the operation in step 216 is not performed,
This prevents the time after the previous step movement from being ignored and the fact that the document 9 is not being conveyed to be overlooked, thereby preventing the correct amount of movement of the trailing edge of the document 9 from being unable to be detected.

Next, proceeding to step 300, the microprocessor 21 clears the step number register 4] in the RAM 23,
Furthermore, the process proceeds to step 301, where the microprocessor 21 clears the total time register 42 in the RAMZ3. Next, proceeding to step 302, the microprocessor 21
Time data is read from the register in the register 34 at the address indicated by the pointer 35 and stored in the total time register 42. Next, the process proceeds to step 303, where the microprocessor 21 checks whether the delay time data stored in the second register 39 is less than or equal to the time data stored in the gold side time register 42. Here, if the delay time data is larger than the time data, the process branches to NO and proceeds to step 304. In step 304, the microprocessor 21 adds 1 to the step number register 4], then proceeds to step 305, and subtracts 1 from the pointer 35. Next, proceeding to step 306, the microprocessor 21 checks whether the address indicated by the pointer 35 indicates an address greater than or equal to the lowest register (the register in which time data t11-7 in FIG. 4 is stored). .

Here, when indicating an address higher than the lowest register, if there is no choice but to return to step 302,
The process advances to step 307, where the pointer 35 is initialized so that the address of the pointer 35 indicates the address of the most significant register of the registers 34, and then the process returns to step 302.

Thereafter, steps 302 to 3 are performed until the time data in the total time register 42 becomes equal to or greater than the delay time data.
The operation shown in 07 is repeated. While such operations are repeated, when the time data in the total time register 42 becomes equal to or greater than the delay time data, Y is determined in step 303.
The process branches to ES and proceeds to step 308.

In step 308, the microprocessor 21 subtracts 1 from the step number data in the step number register 4j and sets it as new step number data. Here, in this facsimile machine, when the reading density of the original 9 is 7.7 fi/mm, 171
The original 9 is conveyed by a length of 7 mm. Therefore, the microprocessor 21 detects the amount of movement of the original 9 on the assumption that the original 9 has been transported by the number of steps in the step number data obtained above multiplied by 177.7 m. For example, assume that the time data 70 is stored in the register in FIG. 4 after the microprocessor 21 receives the trailing edge p detection signal of the document 9. Then, this time data tB
The time data obtained by adding the time data tB-1+L-2 up to two steps before is 48 m5ec, and the time data 1n-1+tn-2+ three steps before is added to the time gator tIl.
Assume that the time added to L-3 is 55 m5ec. Then, 3 should be stored in the step number register, and by subtracting 1 from this, assuming that there was a movement of 2 steps, the microprocessor 21 calculates 2 (steps) x (mm) as the movement amount. shall be.

7.7 After this, the microprocessor 21 operates as follows in order to accurately read the document 9 up to the rear end.

The distance ρ from the position of the end 67 of the lever 65 of the photointerrupter 6 to the reading position 7 in the normal state is the ROM2
2. microprocessor 2
1 subtracts the amount of movement of the original 9 determined above from this distance A, and calculates the distance 1lIz of the remaining sheet that needs to be conveyed in order for the rear end of the original 9 to reach the reading position 7. Therefore, the microprocessor 21, 1 transports the document 9 by the number of steps "77.7-" corresponding to the distance 2, and when the transport of this number of steps is completed, the microprocessor 21, 1 transports the document 9 to the reading system 8. Sends a signal instructing to stop reading the original 9. As a result,
Accurate reading is performed from the leading edge of the original 9 to the f& end of the original 9.

Therefore, there is no possibility that a part of the document 9 is missing when being read, or that unnecessary parts other than the document 9 are read. Therefore, the images recorded and output on the receiver side are
Since the image of the original document 9 on the transmitter side is reproduced, a facsimile device with excellent performance can be provided.

Although the amount of movement of the document was detected in the embodiment, the amount of movement of any moving object that moves in steps can be accurately detected within the delay time of the detection means. .

〔Effect of the invention〕

As described above, according to the present invention, even if a step-moving moving object moves at a variable speed within the delay time by the detection means, the amount of movement of this moving object can be accurately detected. Therefore, the amount of movement within the delay time by the detection means can be known, and this amount of movement can be used for subsequent step movement control of the moving body.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a transport system and a reading system of a facsimile machine, FIG. 2 is a perspective view of the main parts of FIG. 1, and FIG. 3 is a block diagram of the main parts of a facsimile machine adopting the present invention. Fourth
The figure shows a first register in which time data is stored;
FIG. 5 is a functional block diagram of the main part of the present invention, and FIG. 6 is a flowchart for explaining the present invention in detail. 6...Photo ink labeler 8...Reading system 9...
Original 21...Microprocessor 22...ROM
23...RAM, 25...I10 port 26...Event counter path...Stepping motor 31...Detection means 32...Second means 33...
First means 34...First register 35...Pointer Audience...Pulse detection means 37...Data writing means-38...Counter 39...Second register 4
0...Processing means 41...Step number register 42...Total time register Agent patent attorney Book 1) Takashi Figure 2 Figure 3 Figure 4 Mei

Claims (3)

[Claims] (1) A detecting means for detecting that a predetermined part of a moving body that moves in steps has arrived at a predetermined position and outputting a detection signal; 1, a detection signal is given from the detection means, and delay time data that exists until the detection signal is given from the detection means is given, and the delay time data is delayed from the time when the detection signal is received. and a second means for determining data on the number of steps taken by the moving object by going back in time by referring to the time data taken by the first means, the number of steps taken by the second means. A movement amount detection method characterized by detecting a movement amount corresponding to a step of data. (2) The first means includes a pulse detection means that detects the output every time a signal for controlling the entire drive of a stepping motor for each step that moves the moving body step by step is output, and the pulse detection means outputs an output. a counter that is reset by the pulse detection means and starts operating every time it detects;
A first register for storing time data; and data writing means for reading the value of the counter when the pulse detection means detects an output and storing it in the first seven registers as time data. A movement amount detection method according to claim (1), characterized in that: (3) When the second means receives the detection signal from the second register storing predetermined delay time data and the detection means, the second means performs the steps obtained by the first means by this time. Claim 1, characterized in that it is equipped with processing means for retroactively adding time data for each time in the past and calculating the number of steps when the added data becomes the maximum within the delay time data. The movement amount detection method described in item 1) or item (2).