JPH01295697A - mobile device - Google Patents

Abstract

PURPOSE:To perform positioning without requirement of any expensive sensor and to perform cost reduction by a structure wherein the position, in which a mobile member is maximally moved in one direction while step out of a stepping motor occurs, is treated as an initial position for the mobile member. CONSTITUTION:When control means 86 receives an initial position setting signal, the control means 86 supplies a pulse, corresponding to a region exceeding a region to which a mobile member 22 can be moved, for a stepping motor 96. The position, in which the mobile member 22 is maximally moved in one direction while step out of the stepping motor 96 occurs, is treated as an initial position for the mobile member 22. As a result, an expensive sensor for detecting an initial position for a pair of resist rollers is not required, and therefore cost reduction can be performed.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a moving device equipped with a stepping motor used in image forming apparatuses such as copying machines and laser beam printers. The present invention relates to a moving device that moves linearly within a predetermined range.

(B) Conventional technology Conventionally, there has been known a moving device in which a moving member is linearly moved within a predetermined range by a motor, such as a lateral registration device in which a stepping motor moves a pair of registration rollers within a predetermined range in the axial direction. However, in the lateral registration device, the initial position of the pair of registration rollers is detected by a sensor or the like placed at a predetermined position.

(A) Problems to be Solved by the Invention By the way, the above-mentioned lateral registration device requires an expensive sensor to detect the initial position of the registration roller pair, which increases the cost and also requires an electric circuit, etc. This has the disadvantage that the equipment becomes complicated.

Therefore, the present invention moves a moving member by a stepping motor, transmits to the stepping motor a number of pulses equal to or more than the number of pulses equivalent to the maximum movement of the moving member in one direction, and causes the stepping motor to step out of step. It is an object of the present invention to provide a moving device that solves the above-mentioned problems by setting the position where the stepping motor is out of step as the initial position of the moving member.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances.For example, as shown with reference to FIGS. a moving member (22) to obtain a moving member (22);
2), when an initial position setting signal is received, the stepping motor (96) is configured to move the moving member (22) over a range in which the moving member (22) can move. A control means (86) is provided for transmitting a pulse to cause the moving member (22) to
moves maximum to one side, and the stepping motor (
96), the position where the moving member (22) is out of synchronization is set as the initial position of the moving member (22).

(E) Effect Based on the above-described configuration, when the control means (86) receives the initial position setting signal, the control means (86) moves the moving member (22) toward the stepping motor (96) over a range in which the moving member (22) can move. A pulse is emitted, and the moving member (22) moves to an initial position where the stepping motor (96) steps out.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the copying machine 1 has a main body 3 containing a copying section 2, and the main body 3 has a platen 5, a platen 5,
It is equipped with a light source 6, mirrors 7, 8, 9, 10, 11, 12, a lens 13, and two cassettes 15, 16 for storing sheets S. At the top of the cassette 15 is a paper feed roller 17.
A paper feed roller 19 is disposed above the cassette 16. Further, on the upper left side of the main body 3, there is a home position sensor Sl that detects the home position of the optical system such as the light source 6 and mirrors 7, 8, 9, and a home position sensor Sl that detects the home position of the optical system such as the light source 6 and mirrors 7, 8, 9, Compatible image tip sensor S
2 is disposed, and a sensor S3 for detecting the maximum movement position of the optical system is disposed on the upper right side. Furthermore,
Near the cassette 15.16, there are sheet presence/absence sensors S4, 35 that detect the presence or absence of the sheet S, and the cassette 15.16.
Lid sensor S6. detects the position of the lid (not shown) by moving up and down the middle plate (not shown) of the lid (not shown). S7, and cassette 1
5.16 Sheet size sensor S8 detects the size of the sheets stored in the cassette according to the type of cassette. S9 is installed. A pair of conveying rollers 20 and a pair of conveying rollers 21 are disposed downstream of the paper feeding roller 17 and a pair of conveying rollers 20 and 21, respectively.
On the downstream side, there is a sheet sensor S10 that detects the sheet S, and a sheet edge sensor 815 that detects the sheet edge (see Fig. 4).
and a pair of registration rollers 22 are provided. Further, downstream of the roller pair 22, the copying section 2 is arranged, and downstream of the copying section 2, a conveying device 23 and a heater 2 are provided.
A fixing device 25 having a built-in fixing device 5a is provided. and,
A paper discharge sensor S11, a conveyance roller 24, a flapper 26, and a paper discharge roller 27 are provided downstream of the fixing device 25, and a paper discharge tray 29 is provided downstream of the paper discharge roller 27. . Further, a re-conveyance path 30 is provided branching off from the flapper 26, and the re-conveyance path 30 includes:
A pair of transport rollers 31, a sheet sensor 812, a pair of reversing rollers 32, a sheet sensor 313, a pair of refeed rollers 33, and an intermediate tray 34 are provided. Note that the reversing roller 32
is driven by a stepping motor (not shown), and can transport the sheet S in both upstream and downstream directions. Then, the sheet S can be held by placing the stepping motor in a hold state while being energized. Furthermore, a laser unit 35 is disposed within the fuselage main body 3, and the unit 35 has the following functions:
It is composed of a laser emitting section 36, a polygon mirror 37, a polygon motor 39, and a mirror 40.

Note that the reference numeral 41 in the figure is a shutter that blocks light projected onto the copying section 2. Further, the copying section 2 is equipped with a cylindrical photosensitive drum 42, and around the drum 42, an erase lamp 43, a secondary charger 45, a color developer 46, a developer 47, a transfer charger 49, a separation charger, etc. A container 5o and a cleaner 51 are provided. Further, on the upper part of the main body 3, there is a pressure bonding plate 52 for pressure-bonding the original onto the platen 5.
is supported so as to be openable and closable, and on the top surface of the crimp plate 52 is a coordinate position input bag for inputting the coordinate position of the document! (hereinafter referred to as an editor) 53 is provided. In addition, 54 in the figure
The color developer pressure solenoid is designated by a, and the black developer release solenoid is designated by 54b.

On the other hand, the copying machine 1 includes an operation section 55.
5, as shown in FIG. 3, a power switch 56 is arranged on the right end, and a reset/stop key 57 and a start key 59 are arranged on the left side thereof. Further, on the back side of the start key 59, a color developer selection switch key 60, a date instruction key 61 for instructing the date writing mode, and a number instruction key 62 for instructing number writing are arranged. A numeric keypad 63 is arranged to the left of the keys 59. In addition, the numeric keypad 6
A copy number display 65 that displays the number of copies input using the numeric keypad 63, a sheet out display 66 that displays an out-of-sheet alarm, and a jam alarm indicator 67 that alerts you to the occurrence of a jam are arranged on the back side of 3. A selection key 68 for selecting the cassette 15 or 16 and a cassette display 69 for displaying the cassette size are arranged on the left side of the numeric keypad 63. Further, on the left side of the selection key 68, there are a copy density adjustment key 70, a same magnification key 71, and a zoom key 72 for instructing the copy magnification to a predetermined magnification in 1% increments.
, a standard magnification key 73 for instructing a standard reduction or standard enlargement magnification, and a magnification display 75 for displaying a copying magnification on the m side of the standard magnification key 73. Various instruction keys are arranged on the left side of the zoom key 72, and 76 is an instruction key for instructing to erase the border of the copy sheet, 77 is an instruction key for instructing to bind one end of the sheet, and 79 is an instruction key for instructing to remove the border of the copy sheet. 80 is an instruction key for instructing photo mode, 80 is a multiple key for selecting multiplex mode, 81 is a page continuous copying key for instructing continuous page copying, 82 is a double-sided copying key for selecting double-sided copying mode, and 83 is a sorter 85 to be described later.
This is an instruction key for instructing the operation mode (sort mode or group mode).

On the other hand, the copying machine 1 is equipped with a control section 86, as shown in FIG.
It is composed of OM, RAM, timer, etc. The input section of the control section 86 includes each sensor Sl,...
and an editor 53 are connected to the output section, and the output section is connected to the lamp 6, heater 25a, etc. via the laser unit 35, shutter 41, buzzer 87, and AC driver 89.
Load, each charged electricity 45°49 through the high voltage generator HVT
．． 50 and loads such as solenoids, clutches, fans, etc. 90
A main motor 93, an optical motor 95, and a stepping motor 96 are further connected to the input/output section via an operation section 55, a sorter 85, a document conveyance device 91, and a motor control section 92.

Further, a pinion gear 97 is fixed to the output shaft of the stepping motor 96, as shown in FIG. It meshes with. Further, the lower roller 22a and the upper roller 22b are configured to be able to move together in the axial direction, and are configured to move within a predetermined range in the directions of arrows A and B by rotation of the stepping motor 96.

Next, the operation of this embodiment will be explained.

When the power switch 56 is turned on, the control section 86 turns on the heater 25a of the fixing device 25 and the black developer release solenoid 54b, as shown in FIG. When the temperature of the fixer 25 reaches 190°C, the main motor 93
After 1 second (■), turn on the black developer pressure solenoid 5.
Turn 4b off. As a result, the black developing device 8 is retracted to the release position, and then moves to a position closer to the photosensitive drum 42. Then, when the photosensitive drum 42 rotates once,
The control unit 86 stops the main motor 93. Note that when the control section 86 rotates the main motor 93, the control section 86 rotates the main motor 93.
6 detects the position of the middle plate of the force set 15.16 by a sensor (not shown), and when the middle plate is lowered, turns the middle plate raising clutch (not shown) ONL/, cassette 15.1
6 middle plates are raised at the same timing. Then, 0.1 seconds after the middle plate detection sensor is turned on (output is 1), the control unit 86 turns off the middle plate lifting clutch. At this time, the control unit 86 detects the presence or absence of the sheet S using the sheet presence/absence sensors S4 and S5, and determines the presence or absence of the sheet S when the middle plate detection sensor is turned on, and determines that the sheet S is not present. Only when this happens, the no-sheet indicator 66 is turned on (see FIG. 6).

Then, when the start key 59 is pressed, as shown in FIG. 7, the control section 86 turns on the main motor 93, the high voltage generator HVT, and the document transport device 91, and also performs the paper feeding operation, that is, performs the same operation as described above. After the plate is raised, the clutch (not shown) of the paper feed roller 17 or 19 is turned on and off.
The sheet S is fed from the cassette 15 or 16, and after a predetermined period of time after the sheet sensor S10 detects the sheet S,
The clutch is turned off when the sheet S contacts the pair of registration rollers 22 and forms a loop (see FIG. 8).
. In the case of color copying, the developer pressurizes the black developer release solenoid 54b as shown in FIG.
ONL/, the black developer 47 is separated from the photosensitive drum 42, and then the color developer pressure solenoid 54a is ONL,
Then, the color developing device 46 is set on the photosensitive drum 42. Then, by turning on the main motor 93, the primary band electricity 45
The control unit 86 detects, using a sensor (not shown), that the photosensitive drum 42, which is uniformly charged, has rotated approximately one revolution.
The lamp 6 is turned on, the optical motor 95 is turned on, and the optical system of the lamp 6, mirror 7, etc. is advanced to expose and scan the document on the platen 5, and the image tip sensor S2 detects the image tip. After that, the registration roller pair 22 is turned on for a predetermined time (tl) tli. Then, the control unit 86 turns on the paper feed clutch for a predetermined period of time in the same way as or before the ON operation of the roller pair 22, rotates the paper feed roller 17 or 19 again, and feeds the sheet S backward. (See FIG. 8), the registration roller pair 22 is rotated for a time corresponding to the sheet size. At this time, the sheet S held between the pair of registration rollers 22 is subjected to a horizontal registration operation, which will be described later.
The image is projected onto the photosensitive drum 42 by the optical system and the developing device 4
It is conveyed in synchronization with the image visualized by 6 or 47. Note that when the optical system scans the document, the laser unit 35 erases any part of the image and erases the date and number.
You can write simple characters such as The sheet S, which is conveyed in synchronization with the image on the photosensitive drum 42 by the pair of registration rollers 22, has the image on the drum 42 transferred to it by a transfer charger 49, and is separated from the photosensitive drum 42 by a separation charger 50. Ru. At this time, when the optical system such as the lamp 6, mirror 7, etc. is detected by the sensor S3, the optical system is reversed and returned to the home position.

Then, the sheet S onto which the image has been transferred is transferred to a conveying device 23.
The image is conveyed to the fixing device 25 by the fixing device 25, and the image is fixed by the fixing device 25. Further, the sheet S is conveyed to a flapper 26 by a conveying roller 24, guided by the flapper 26 to a pair of paper discharge rollers 27, and discharged to a paper discharge tray 29 by the pair of rollers 27.

Here, the horizontal registration work will be explained in detail.

When the start key is pressed, the control unit 86 sends a pulse to the stepping motor 96 in the direction in which the pair of registration rollers 22 moves in the direction A (see FIG. 4) for a distance greater than the distance that the pair of rollers 22 can move. Then, the rotation of the stepping motor 96 is transmitted to the rack 99 via the pinion gear 97, and as the rack 99 moves, the registration roller pair 22 moves in the direction A, and comes into contact with a stopper (not shown) at the point of maximum movement. As a result, the stepping motor 96 steps out of synchronization, and then the control unit 86 outputs to the stepping motor 96 a pulse corresponding to half of the pre-calculated distance by which the pair of registration rollers 22 can move in the direction B at the maximum. . Then, the registration roller pair 22
is an intermediate position (home position) that can be moved in direction B
This completes the initialization (first
(See figure 0).

If the sheet S fed from the cassette 15 or 16 by the paper feed roller 17 or 19 and held between the pair of registration rollers 22 has already been detected by the sheet end sensor S15, the control unit 86 controls the stepping motor 96 In other words, the registration roller pair 22 rotates in the direction of arrow B (see FIG. 4). Then, after the sheet edge sensor S15 detects the edge of the sheet S, the control unit 86 further controls the stepping motor 96 at a predetermined ratio
1 (I21) and then stops, completing the setting (see FIGS. 10 and 11(a)). In addition,
At this time, since the sheet S forms a loop between the pair of registration rollers 22 and the pair of transport rollers 20 or 21, movement of the leading end of the sheet S in the lateral direction is permitted. After the sheet S is conveyed by the pair of registration rollers 22, the same number of pulses as the number of pulses required for setting are outputted to the stepping motor 96 in the normal rotation direction, that is, in the direction in which the pair of registration rollers 22 moves in six directions. As a result, the registration roller pair 22 is returned to its home position.

Further, if the sheet S held between the pair of registration rollers 22 is not detected by the sheet end sensor S15, the control unit 86
The stepping motor 96 is rotated in the normal direction to move the pair of registration rollers 22 in the direction A, and when the sheet edge sensor S15 detects the sheet S, the stepping motor 96 is rotated in the reverse direction so that the sheet edge sensor S15 no longer detects the sheet S. Then, the predetermined ratio m H! + ) in the direction B (see FIG. 11(b)). As a result, the sheet S is laterally registered. And the sheet S
After conveying, the pair of registration rollers 22 is returned to the home position in the same manner as described above. In this way, by always stopping the stepping motor after driving a predetermined distance after the sensor no longer detects the sheet, correct lateral registration can be performed without being affected by gear pack crashes and the like.

On the other hand, the case of performing multiple or double-sided copying will be explained with reference to the flowchart of FIG.

When the start key is pressed, the control unit 86 determines whether the original is a standard size (F1), and if it is determined not to be a standard size, sets the number of copies to 1 (F2), and operates the intermediate tray 34 in single mode. (F3), in the single mode, as shown in FIG. and is conveyed to a pair of reversing rollers 32, and comes into contact with the pair of rollers 32 to form a loop. As a result, the skew of the sheet S is corrected. Then, after a predetermined period of time has elapsed since the sheet sensor S12 detects the leading edge of the sheet S, the pair of reversing rollers 32 and the pair of refeeding rollers 33 are driven to convey the sheet S to the pair of registration rollers 22. Then, after a predetermined time m after the sheet sensor S10 detects the leading edge of the sheet S, the reversing roller pair 32 and the refeeding roller pair 33 are stopped, and the sheet S forms a loop and skews. Corrected.

Furthermore, the operator replaces the document and presses the start key 59.
When (F4) is pressed, the control unit 86 controls the reversing roller pair 32,
The pair of refeed rollers 33 and the pair of registration rollers 22 are driven, and after horizontally registering the sheet S in contact with the pair of rollers 22, the sheet S is synchronously conveyed toward the copying section 2 for second copying. Then, by the same operation as described above, the sheet S is copied a second time, the image is fixed in the fixing device 25, and the sheet S is discharged to the paper discharge tray 29 (F5).

On the other hand, if it is determined in F1 that the document is of a standard format, the control unit 86 determines whether the number of copies is one or not (F6); It is determined whether the sheet S stored in the tray 16 is A4, B5, or letter size, which is suitable for the multiple modes of the intermediate tray 34 (F7). And the sheet S is A
4. If it is determined that the size is B5 or letter size, the control unit 86 determines that the number of copies is 10, that is, the number of copies is 10, that is, the number of copies is 10, that is, the number of copies is 10,
If it is determined that the number of sheets is 10 or more, the number of sheets to be copied is set to 10 (F9).Then, the control unit 10 controls the intermediate tray 34. When the sheet S operated in multiple modes and subjected to the first copy in the same manner as described above is conveyed to the re-conveying path 30, the sheet S is held between the pair of conveying rollers 31 and comes into contact with the pair of reversing rollers 32. form a loop. Further, the sheet S has its leading end connected to a sheet sensor S12.
After a predetermined period of time after the sensor S12 detects the leading edge of the sheet S, the reversing roller pair 32 rotates forward by a predetermined amount, that is, rotates in the direction of conveying the sheet S toward the refeed roller pair 33. do. After that, the reversing roller pair 32
is reversed, for example, after the sheet S is conveyed 70++n+, it is returned 6C1am, and the leading edge of the sheet S is
The roller protrudes from the pair of reversing rollers 32 and stops (14th
and FIG. 15(a)), and by the same operation, the reversing roller pair 32 holds a plurality of sheets S with their tips shifted by 10 mm and overlapping each other (see FIG. 15(b)) (Flo ). Then, when the start key 59 is pressed by performing the same operation as F4 described above, the control unit 86 rotates the pair of reversing rollers 32 and the pair of refeeding rollers 33, and the pair of reversing rollers 32 or the sheet S to be held ... to be transported. Further, when the rear end of the lowest sheet S among these sheets S... passes the reversing roller pair 32, the reversing roller pair 3
2 is stopped (see Figures 15(c) and 16),
As a result, only the lowest sheet S is fed to the refeed roller pair 3.
3, the sheet S is fed again to the pair of registration rollers 22, the sheet S is copied a second time by the same operation as described above, and is discharged to the paper discharge tray 29. In addition, when refeeding the second and subsequent sheets, as shown in FIG.
All you have to do is rotate it by 0mm. In addition, if the number of copies is 1 in the above F6, and if the sheet size is not A4, B5, or letter size in the above F7, the above F3
Performs the same operation as .

In the above-described embodiment, the stepping motor 96 may be stopped after the registration roller pair 22 is moved by a predetermined portion IIIΩ1 after the sheet end sensor S15 no longer detects the sheet S. S1
The stepping motor 96 may be stopped immediately after the motor 5 stops detecting the sheet S.

Furthermore, in the above embodiment, the sheet end sensor S15 detects the sheet S, and after the sensor S15 no longer detects the sheet S, the stepper registration roller pair 22 is moved a predetermined distance β, and then the stepping motor 96 is turned on. Although the stepping motor 96 is stopped, the present invention is not limited to this, and the stepping motor 96 may be stopped after the sheet end sensor S15 detects the sheet S.

Note that since the curl of the sheet S differs between double-sided copying and multiple copying, the amount of loops formed by contacting the reversing roller pair 32 may be changed between double-sided copying and multiple copying.

Further, in the above embodiment, the loop amount of the sheet S fed from the cassette 15 or 16 and the loop amount of the sheet S re-fed from the intermediate tray 34 are the same. However, the loop amount may be changed. By doing so, it is possible to absorb the difference in the amount of sheet curl between double-sided copying and multiple copying.

Further, in the above embodiment, the conveying roller pair 31 is configured to rotate only in one direction, but the configuration is not limited to this, and it may be configured to rotate between both directions. (A3.84, etc.) sheets can be stacked and stored using the pair of rollers 31 and the pair of reversing rollers 32. By the way, the amount of loops formed by contacting the pair of registration rollers 22 is slightly different between the single mode and the multiple mode. This is because sheet slippage and the like vary depending on the number of sheets held by the paper refeeding roller pair 33. Therefore, the loop amount may be changed between single mode and multiple mode.

In the above-described embodiment, the leading ends of the plurality of sheets S are stacked and stored in the intermediate tray 34 while being shifted by LOm+n, but the present invention is not limited to the length by which the leading ends are shifted.

Furthermore, in the above-mentioned embodiment, the intermediate tray 34 has a maximum of one
Although it is possible to store 0 sheets, the storage is not limited to this, and the length may be changed depending on the sheet length.

Further, in the above embodiment, when refeeding the sheet, the reversing roller pair 32 is rotated by the number of pulses that transport the sheet S by IC1+m, but the present invention is not limited to this. Time reversal roller pair 32
may also be rotated.

(G) As described in detail, according to the present invention, the initial position of the movable member is the position where the movable member has moved to the maximum in one direction and the stepping motor has lost synchronization, thereby eliminating the need for an expensive sensor. First, it is possible to reduce costs and simplify the apparatus.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing control means according to the present invention. FIG. 2 is a front sectional view showing an image forming apparatus equipped with the present invention, and FIG. 3 is a plan view showing the operation section thereof. Moreover, FIG. 4 is a perspective view showing the moving device according to the present invention. Furthermore, Figures 5 to 11 (a), (b)
The foregoing are timing charts showing the operation of the present invention. FIG. 12 is a flowchart showing the operation of this embodiment. Further, FIGS. 13 and 14 are timing charts showing the operation of this embodiment. Furthermore, Fig. 15 (
a), (b), and (C) are schematic diagrams showing the operation of this embodiment. 16 and 17 are timing charts showing the operation of this embodiment. 22... Moving member, 86... Control means, 96
...Stepping motor.

Claims (1)

[Claims] 1. In a moving device comprising a moving member capable of linearly moving within a predetermined range and a stepping motor for moving the moving member, upon receiving an initial position setting signal, the stepping motor causes the moving member to move. a control means for transmitting a pulse corresponding to a range greater than the possible range, and a position where the moving member moves to the maximum in one direction and the stepping motor steps out is set as an initial position of the moving member. Characteristic mobile device.