JP2000169001A - Paper feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start and stop drive of a paper feeding roller in desired timing regardless of a paper kind in a paper feeder for feeding a paper to a image- forming processing part with the paper feeding roller. SOLUTION: In this paper feeder, a memory means 44 is stored with a table showing relation of timing of a drive start and a drive stop of a paper feeding roller with both a paper kind and a print speed, while the timing of the drive start and the drive stop of the paper feeding roller is set according to the paper kind and the print speed in reference to the table. A controller 40 controls the drive of a paper feeding mechanism 45 on the basis of the set timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder used for an image forming apparatus such as a copying machine or a stencil printing machine.

[0002]

2. Description of the Related Art In general, a paper feeder incorporated in an image forming apparatus such as a copying machine or a stencil printing machine uses a paper feed roller for rotating a plurality of sheets placed on a paper feed table one by one. The sheet is taken out and conveyed to a registration roller, and the sheet is conveyed to an image forming processing unit such as a plate cylinder or a photosensitive drum for copying by the registration roller. Such a paper feeding device is disclosed, for example, in Japanese Patent Publication No. 58-75.
No. 82, the rotation of the registration roller is performed so that the sheet is supplied to the image forming processing unit at a predetermined time by the registration roller, and the inclination of the sheet due to the oblique feeding of the sheet in the conveyance process is eliminated. Even if the leading edge of the paper arrives at the registration roller before the start, the paper feed roller is driven for a little while. Therefore, in such a sheet feeding device, the sheet conveyed from the sheet feeding table to the registration roller by the sheet feeding roller is moved between the sheet feeding roller and the registration roller until the sheet is conveyed to the image forming processing unit by the registration roller. Causes a slack curve in the transport direction. An appropriate slack curve is useful for eliminating the inclination of the sheet caused by the oblique feeding in the conveying process.

In the above-described paper feeding apparatus, the paper feeding roller is generally connected to a driving source via an electromagnetic clutch, and the electromagnetic clutch is connected each time one sheet of paper is taken out. The paper feed roller is driven to rotate by a predetermined angle. For this reason, the conveyance amount of the paper by the paper feed roller may change due to a difference in frictional resistance depending on the type of the stacked paper or the printing speed, a difference in stiffness of the paper itself, or the like. For example, the rotation angle of the paper feed roller is set so that the frictional resistance with the paper feed roller is large and the degree of conveyance is relatively good so that the paper can be changed.
If thick paper is fed as it is, if the thick paper does not reach the registration roller reliably due to slippage with the paper feed roller or increased resistance due to contact with the guide plate, or even if it does, Inconveniences such as not being able to obtain a sufficient transport amount to form the slack curve of the lens.

Therefore, by inputting data relating to the type of paper to be fed from input means and setting the driving amount (driving time) of the paper feed roller based on this data, it is ensured that the type of paper does not depend on the type of paper. A paper feeding device capable of performing paper feeding and conveyance has been proposed (for example, Patent No. 2728).
463). Further, there has been proposed a paper feeding device in which the driving amount of the paper feeding roller is set based on not only the type of paper to be fed but also the printing speed (Japanese Patent Application Laid-Open No. HEI 1-1990).
0-35910). In these paper feeding devices, when paper is detected by a paper sensor for detecting that the paper has arrived at the registration roller, energization of the electromagnetic clutch is started to drive the paper feeding roller, and the type of paper and printing are performed. When the paper feed roller is driven by a drive amount set based on the speed, the power supply to the electromagnetic clutch is stopped to stop the drive of the paper feed roller, thereby controlling the conveyance of the paper.

[0005]

The above Patent No. 2
According to the paper feeding device described in Japanese Patent Application Laid-Open No. 728463/1998 and Japanese Patent Application Laid-Open No. 10-35910, it is possible to solve the problem of paper feeding failure due to the type of paper and the printing speed. However, in these paper feeders, only a drive amount corresponding to only a predetermined number of types of paper can be set, so that optimal paper feed performance is provided for all papers on the market. Not be able to
When a sheet not included in the options is supplied, there is a possibility that a paper supply failure occurs. In this case, the problem of paper feeding failure can be solved by storing the drive amounts corresponding to all paper types in advance so as to be able to handle all types of paper, but the drive amounts corresponding to all papers are stored. It is practically impossible to keep this in view of the capacity and cost of the memory mounted on the paper feeding device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a sheet feeding device capable of setting an optimum driving amount of a sheet feeding roller according to a sheet.

[0007]

In a paper feeder according to the present invention, a plurality of papers placed on a paper feed table are taken out one by one by a paper feed roller driven to rotate and conveyed to a registration roller. A sheet feeding device that conveys the sheet to the image forming processing unit at a predetermined time by the registration roller, wherein at least one of drive start and drive stop timings of the sheet feed roller can be set to a desired timing And control means for controlling the driving of the paper feed roller based on the timing set by the setting means.

[0008] In the paper feeder according to the present invention,
It is preferable that the setting unit is a unit that can set the timing according to the type of the sheet and a preset adjustment amount.

Further, in the paper feeder according to the present invention,
It is preferable that the setting unit is a unit that can set the timing according to the type of the paper, a preset adjustment amount, and a printing speed.

Here, the "adjustment amount set in advance" is
For example, when the timing is not an arbitrary value but can be set in a plurality of stages according to the type of paper, printing speed, and the like, it refers to an amount for finely adjusting the timing set for each stage. For example, in order to adjust the slack amount of the sheet between the sheet feeding roller and the registration roller, the adjustment amount is set to a numerical value “−2, −1,
0, 1, 2 [mm] ", it suffices to select and set from these numerical values.

[0011]

According to the present invention, at least one of the drive start and drive stop timings of the paper feed roller is set to a desired timing by the setting means, and the control means sets the paper feed roller based on the set value. Is controlled. As described above, the setting unit can set at least one of the drive start and drive stop timings of the sheet feed roller to a desired timing.
The drive of the paper feed roller can be appropriately controlled regardless of the type of paper and the printing speed, thereby preventing poor paper feed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are views showing a configuration of a sheet feeding apparatus according to an embodiment of the present invention. The sheet feeding device is provided in the printing press, and a plurality of sheets P are stacked and placed on the sheet feeding table 1, and the sheet feeding table 1 is moved to a position shown in FIG. It is driven up and down. A front barrier plate 2 is erected at the forefront of the paper feed table 1 in the paper feeding direction, that is, on the right side of the paper feed table 1 in FIG.
The position of the front edge of the paper P placed thereon is determined. Above the front barrier plate 2, a paper feed roller 3 formed of rubber or a rubber-like product is provided. The paper feed roller 3 is supported by a pair of side plates 5 by a support shaft 4.
It is rotatably supported between them. One end of the support shaft 4 is connected to a driven side of an electromagnetic clutch 6 for turning on / off the transmission of power to the paper feed roller 3. Concatenated,
Only when the electromagnetic clutch 6 is energized, that is, when the driven side and the drive side of the clutch are in the engaged state, the clutch is rotated in the counterclockwise direction A as viewed in FIG.

The timing of the rotation is controlled by a paper feed clutch sensor 50 as shown in FIG. The paper feed clutch sensor 50 has a slit 5
The disk 51 having 1a is rotationally driven by the output of the paper feed signal. The paper feed roller 3 is driven to rotate in the counterclockwise direction A as viewed in FIG.

On the other hand, a paper separating pad holder 8 is provided at the upper end of the front barrier plate 2 so as to face the paper feed roller 3. The paper separating pad holder 8 is supported by a bracket 9 so as to be movable in the radial direction of the paper feed roller 3, and is urged toward the outer peripheral surface of the paper feed roller 3 by the spring force of a compression coil spring 10. A paper separating pad 11 is attached to the upper surface of the paper separating pad holder 8, that is, a surface portion facing the outer peripheral surface of the paper feed roller 3.
Is formed of a material having a relatively large coefficient of friction, such as rubber or a rubber-like product, or cork.
Is opposed to the outer peripheral surface of.

Next, a lower guide plate is provided in front of the sheet feeding roller 3 in the sheet feeding direction (arrow C), that is, on the image forming processing unit side constituted by the plate cylinder 25 and the corresponding press roller 26. A paper feed path 13 is formed by the upper guide plate 12 and the upper guide plate 2a. The paper feed path 13 extends from the paper feed roller 3 to the image forming processing unit constituting the printing press. Near the end of the paper feed path 13, a registration roller 16 composed of a pair of upper and lower rollers 14 and 15 is provided. Is provided. The outer peripheral surfaces of the rollers 14 and 15 are in contact with each other, and the rollers 14 are intermittently driven to rotate clockwise B in FIG. 1 by a driving device (not shown).

The upper guide plate 12 is moved upward between the paper feed roller 3 and the registration roller 16 to allow the paper P to be slack-curved in the transport direction C as shown in FIG. It is curved like a bow, and the paper feed path 1
Numeral 3 extends in the vertical direction in FIG. 1 before the registration roller 16. Immediately before the contact portion between the rollers 14 and 15 constituting the registration roller 16, the registration roller 16 is detected by detecting that the sheet P fed and conveyed from the sheet supply table 1 has passed toward the registration roller 16.
And the drive of the paper feed roller 3 is turned off.
There is provided a paper sensor 17 for obtaining the timing of the operation.

FIG. 4 is a schematic block diagram showing the configuration of the control device of the sheet feeding device according to the present embodiment. As shown in FIG. 4, the control device 40 has a CPU 41 composed of a microprocessor or the like.
Each mechanism in the apparatus is controlled based on the program and setting information stored in the OM 42. Also, the CPU 41
Is connected to a RAM 43 for storing the number of prints and the like input from the operation panel 20 of the printing press as needed. Further, a storage means 44 capable of storing the setting contents of the sheet feeding roller ON / OFF set as described later is connected even when the power of the printing press body is turned off. The control device 40 includes, in addition to the sheet feeding mechanism 45 constituting a sheet feeding device, a plate cylinder driving mechanism 46 constituting an image forming processing unit 70 of the printing press,
Plate making mechanism 47, plate receiving / discharging mechanism 48, and paper discharging mechanism 49
Are connected, and the driving of these mechanisms is controlled by the control device 40.
Is controlled by

The paper feed mechanism 45 is provided with the paper sensor 1 described above.
7, an electromagnetic clutch 6, a paper feed clutch sensor 50 for obtaining a timing for turning on the paper feed roller, and a paper feed table vertical mechanism 55 for setting the paper feed table 1 on which the paper P is set to the paper feed position. And a paper size sensor 56 for detecting the size of the paper P set on the paper feed table 1.

The CPU 41, the ROM 42, the storage means 44, and the operation panel 20 connected to the CPU 41 constitute a setting means and a control means in the present invention.

FIG. 5 is a diagram showing the configuration of the operation panel 20 of the printing press. The operation panel 20 includes a numeric keypad 21, a number LED 22, an indicator 23 including a liquid crystal panel, a cursor key 24, an enter key 34, a start key 35, a stop key 27, a plate making / printing key 28, plate making / printing mode LEDs 29, 30. A paper type setting key 31 for setting the type of paper set on the paper supply table 1, a paper supply ON setting key 32 for adjusting the timing for starting paper supply,
Paper feed OFF for adjusting the timing to end paper feed
Setting key 33, speed-up key 3 for setting printing speed
6, a deceleration key 37, and a print speed display LED 38 for displaying a set value of the print speed.

The numeric keypad 21 is composed of numeric keys 0 to 9 and is operated by pushing when setting the number of prints and the like.

The number-of-sheets LED 22 indicates the number of prints set by the ten keys 21. The display value of the number-of-sheets LED 22 is displayed by subtracting one from the set value in synchronization with the ejection of the printed sheet by the printing operation of the printing press.

The display 23 displays an error display when an error such as a jam occurs, a paper size and paper type setting key 31 of the printed paper P detected by the paper feeding mechanism 45.
The paper type set by is displayed.

The cursor key 24 is used to move a cursor on the selection screen displayed on the display 23.

The confirmation key 34 is for confirming the item selected by the cursor key 24.

The start key 35 is pressed to execute the operation of the printing press, and the stop key 27 is pressed to stop the operation of the printing press.

The plate making / printing key 28 is for switching between plate making operation and printing operation, and is an LED 2 for setting a plate making / printing mode according to the switched operation.
9, 30 light up.

The paper type setting key 31 is pressed to display a selection screen for selecting the type of the paper P set on the paper feed table 1.

A paper feed ON setting key 32 and a paper feed OFF setting key 33 are used to call an adjustment screen for adjusting the paper feed ON / OFF timing according to the paper type selected by the paper type setting key 31. Is pressed.

In the present embodiment, there are five printing speeds, and the printing speed increases by one step each time the speed-up key 36 is pressed once, and the printing speed increases by one step each time the deceleration key 37 is pressed once.
The printing speed decreases step by step. The set print speed can be confirmed by turning on the corresponding one of the five print speed display LEDs 38.

FIGS. 6 to 10 are views showing the display state of the display 23. FIG. FIG. 6 shows a paper selection screen displayed on the display 23 when the paper type setting key 31 is pressed.
When the paper type setting key 31 is pressed, the selected paper type is highlighted. Then, by pressing the cursor key 24, the paper type to be highlighted is changed. Then, the paper type selected at the time when the enter key 34 is pressed becomes the newly selected paper type.

FIGS. 7 and 8 show setting screens for setting the ON timing and the OFF timing of the paper feed roller 3. FIG.
8, the slack adjustment amount is displayed, and the value can be changed by pressing the cursor key 24. When the enter key 34 is pressed, the changed paper feed ON slack adjustment amount and paper feed OFF are changed. Based on the slack adjustment amount, ON and OFF timings of the sheet feed roller 3 are set as described later.

FIGS. 9 and 10 show examples of errors displayed on the display 23. FIG.

Next, the operation of this embodiment will be described. FIG. 11 is a flowchart showing the operation for setting the paper type. First, by pressing the paper type setting key 31 on the operation panel 20, a paper type selection screen shown in FIG. 6 is displayed on the display 23 (step F111). Selectable paper types are displayed on the paper type selection screen, and the display of the currently selected paper type is highlighted. In this state, pressing the cursor key 24 selects a paper type to be used, and pressing the enter key 34 stores data corresponding to the selected paper type in the register PK. The values of the register PK are standard: 0, thin paper: 1, thick paper: 2, and user: 3. Therefore, if the standard is selected (step F11)
2) Register PK = 0 is set (step F113), and if thin paper is selected (step F114), register PK =
1 (step F115), if thick paper is selected (step F116), the register PK is set to 2 (step F117), and if the user is selected (step F11).
8) The register PK is set to 3 (step F119).
Here, the paper type “user” is for adjusting the paper feed timing and registering the paper for the paper that is frequently used by the user of the printing press.

Here, the paper type is set on the operation panel 20.
However, the type of paper may be set by providing a mechanism for determining the type of paper in the paper feed cassette, or by providing a mechanism capable of identifying a difference in the structure of the paper feed unit depending on the type of paper. .

FIG. 12 is a flowchart showing the feed ON slack adjustment amount setting operation. Paper feed on operation panel 20
When the setting key 32 is pressed, the paper feed ON slack adjustment amount corresponding to the paper type PK set at that time is called from the register Qon (PK) and stored in the register Tc (step F121). Here, the register Qon
(PK) is stored in the storage means 44 capable of storing information even when the power of the printing press is turned off, and the information regarding the previously set paper feed ON slack adjustment amount is used even after the power is turned on next time. Is possible. Next, a setting screen shown in FIG. 7 is displayed (step F122). The registered paper feed ON slack adjustment amount is displayed on the setting screen. Here, the feed ON slack adjustment amount is indicated by the cursor key 2
4 to select. The feed ON slack adjustment amount is
There are seven levels of −3, −2, −1, 0, 1, 2, and 3, and can be changed one by one by operating the cursor key 24. That is, when the right cursor key 24 is pressed (step F123), the register Tc
Increases by one (step F124), and when the left cursor key 24 is pressed (step F125), the register Tc decreases by one (step F126). Then, when the enter key 34 is depressed at the time when the feed ON slack adjustment amount is changed by the cursor key 24 (step F127), the value of the register Tc set at that time is set as the feed ON slack adjustment amount. The register Qon (PK) is reset (step F128).

FIG. 13 is a flowchart showing the operation for setting the feed OFF slack adjustment amount. Regarding the setting of the feed OFF slack adjustment amount, similarly to the setting of the feed ON slack adjustment amount,
When the paper feed OFF setting key 33 is pressed, the paper feed OFF slack adjustment amount corresponding to the paper type PK set at that time is called from the register Qoff (PK) and stored in the register Tc (step F131). Here, the register Qoff (PK) is stored in the storage means 44, and can be used even after the power is turned on next time, with the previously set information relating to the paper feed OFF slack adjustment amount. Next, a setting screen shown in FIG. 8 is displayed (step F132). In the setting screen, the registered paper feed OF
The F slack adjustment amount is displayed. Here, the feed OFF slack adjustment amount is selected by changing it with the cursor key 24. The feed OFF slack adjustment amount is -3, -2, -1, 0,
There are seven levels, 1, 2, and 3. By operating the cursor key 24, the level can be changed step by step. That is, when the right cursor key 24 is pressed (step F133), the register Tc increases by 1 (step F134), and when the left cursor key 24 is pressed (step F135), the register Tc decreases by 1 (step F136). Then, when the enter key 34 is pressed (step F137), the value of the register Tc set at that time is set as the sheet feed OFF slack adjustment amount in the register Q.
It is reset to off (PK) (step F138).

FIG. 14 is a flowchart showing the printing speed setting operation. When the print speed up key 36 is pressed (step F161), it is determined whether the print speed set in the register V is V = 5 (step F1).
62) Except when V = 5, V + 1 is newly set in the register V (step F163). When the deceleration key 37 is pressed instead of the speed-up key 36, it is determined whether the printing speed set in the register V is V = 1 (step F164), and V = 1 is set. If not, V-1 is newly set in the register V (step F165).

FIG. 15 is a flowchart showing the printing operation. First, the number of prints is set by the ten keys 21 (step F141), and when the start key 35 is pressed (step F142), the paper type PK, printing speed V, and register Qon (P) set at that time are set.
Based on the value of K), the paper feed ON delay time is selected from the paper feed roller ON timing table shown in Table 1 below and set in the register Pin (step F143). Similarly, the paper type PK, printing speed V, and register Qoff
Based on the value of (PK), the paper feed OFF delay time is selected from the paper feed roller OFF timing table shown in Table 2 below, and set in the register Pout (step F14).
4). Then, using the set values of the registers Pin and Pout set in this way, the sheet feeding operation (step F
145), sheet discharge operation (step F146), plate cylinder operation (step F147), and sheet discharge table operation (step F1)
48) until the number of prints becomes 0 (step F14).
9) It is repeatedly executed.

[0041]

[Table 1]

[0042]

[Table 2]

Here, the feed roller ON timing table shown in Table 1 will be described. The feed roller ON timing table is stored in the ROM 42 in advance. Then, the paper type PK, printing speed V, and register (paper feed ON slack adjustment amount) Qon set by the operation panel 20
By (PK), the paper feed ON delay time is selected from the paper feed roller ON timing table. The paper feed ON delay time is a delay time [ms] from when the paper feed clutch sensor 50 is turned on to when the electromagnetic clutch 6 is turned on. At this time, if the feed ON slack adjustment amount Qon (PK) is set to +1, the slack amount of the paper P between the feed roller 3 and the registration roller 16 is set to be 1 mm larger than the standard. When the paper feed ON slack adjustment amount Qon (PK) is set to -1, the slack amount of the paper P between the paper feed roller 3 and the registration roller 16 is a set value that is reduced by 1 mm from the standard.

When the electromagnetic clutch 6 is turned on, the drive of the motor driving the plate cylinder 25 is transmitted to the feed roller 3 to drive the feed roller 3. Here, when the printing speed is changed, the driving speed of the paper feed roller 3 is also changed. Therefore, in order to always obtain the same slack amount irrespective of the printing speed, the electromagnetic clutch 6 must be changed every time the printing speed changes. It is necessary to change the delay time until turning on. For this reason, in the paper feed roller ON timing table, different delay times are set in accordance with the printing speed even if the paper feed ON slack adjustment amount Qon (PK) is the same. Therefore, feed O
If the N slack adjustment amount Qon (PK) is the same, the slack amount of the paper P is adjusted to be the same at any printing speed.

On the other hand, the feed roller OFF timing table shown in Table 2 is also stored in the ROM 42, similarly to the feed roller ON timing table. Then, the paper type PK, printing speed V, and register (feeding time OFF slack adjustment amount) set by the operation panel 20
The feed OFF delay time is selected from the feed roller OFF timing table by Qoff (PK). Paper feed O
The FF delay time is a delay time [m from when the paper feed clutch sensor 50 is turned off to when the electromagnetic clutch 6 is turned off.
s]. At this time, the feed OFF slack adjustment amount Qoff
When (PK) is set to +1, the slack amount of the sheet between the sheet feeding roller 3 and the registration roller 16 is set to increase by 1 mm from the standard. Also, the feed OFF slack adjustment amount Q
When off (PK) is set to −1, the slack amount of the sheet P between the sheet feeding roller 3 and the registration roller 16 is 1 unit smaller than the standard.
The set value is reduced by mm.

Similarly to the paper feed roller ON timing table, the paper feed roller OFF timing table is provided with a paper feed OFF slack adjustment amount Qoff (PK) in order to always obtain the same slack amount regardless of a change in printing speed. Are different, different delay times are set according to the printing speed. Therefore, the feed OFF slack adjustment amount Qoff (P
If K) is the same, the slack amount of the paper P is adjusted to be the same at any printing speed.

FIG. 16 is a flowchart showing the sheet feeding operation. First, it is confirmed that there is paper P on the paper feed tray 1 (step F151), and if it is confirmed that there is no paper P on the paper feed tray 1, an out-of-paper error is displayed on the display 23 as shown in FIG. F160), the printing operation is suspended (step F163). If there is a sheet P on the sheet supply table 1, it is confirmed that the sheet supply clutch sensor 50 is turned on next (step F152), and the register Pin is set as described above.
Then, the timer for the paper feed ON delay time set in the timer is started (step F153). Then, after a lapse of the set time (step F154), energization of the electromagnetic clutch 6 is started to turn on the electromagnetic clutch 6 (step F15).
5). As a result, the driving force on the drive side of the electromagnetic clutch 6 is transmitted to the driven side, and the paper feed roller 3 is driven to rotate in the direction of arrow A in FIG. As the paper feed roller 3 rotates, the uppermost paper P on the paper feed table 1 is picked up and directed toward the registration roller 16 (in the direction of arrow C in FIG. 1).
The paper is fed and conveyed along a.

The leading edge of the fed paper P reaches the vicinity of the contact portion between the rollers 14 and 15 of the registration roller 16,
When the paper sensor 17 detects that the paper P has been conveyed, that is, when the paper sensor 17 is turned on (step F156), the register Pou is used as described above.
The timer for the paper feed OFF delay time set at t is started (step F157). At this time, since the roller 14 has not yet been driven to rotate and has stopped, the paper P
Is prevented from proceeding any further. And
After the set time has elapsed (step F158), the electromagnetic clutch 6 is turned off (step F159).

As a result, the paper feed roller 3 is driven to rotate in the counterclockwise direction A as shown in FIG. 1 even after the paper P reaches the registration rollers 16, whereby the paper P is fed with the registration rollers 16. While being guided by the curved portion 12 a of the upper guide plate 12 between the roller 3 and the roller 3, a slack curve that rises upward is generated. That is, since the driving amount of the paper feed roller 3 is controlled based on data optimally set for each type of the paper P, it is necessary to always maintain a state suitable for feeding and transporting the paper P. Can be. Further, since it is easy to change and register the setting of this data to a more optimal state, it is possible to set more optimal data according to the specification environment of the printing press.

If it is confirmed in step F156 that the paper feed clutch sensor 50 has been turned off before the paper P is conveyed to the paper sensor 17 (step F161), the paper P cannot be conveyed normally. Therefore, a feed error is displayed on the display 23 (step F).
162), the printing operation is interrupted (step F16)
3).

In the above embodiment, the paper feed roller 3 is driven by transmitting the power from the motor for driving the plate cylinder by the electromagnetic clutch 6, but the paper feed roller 3 is driven by the dedicated motor. The present invention can also be applied to those that do. In other words, if the rotation angle of the plate cylinder is detected by an encoder sensor or the like, and the motor for driving the paper feed roller 3 is turned ON / OFF when a certain paper feed timing angle is reached,
The timing of turning on / off the sheet feeding motor 3 can be set arbitrarily as in the present invention.

In the above-described embodiment, the feed rollers are turned on / off with reference to the tables shown in Tables 1 and 2.
Is set, the input roller ON / OFF timing may be set by inputting an arbitrary value from the operation panel 20.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a sheet feeding device according to an embodiment;

FIG. 2 is a plan view of the sheet feeding device according to the embodiment;

FIG. 3 is a side view of a paper feed clutch sensor.

FIG. 4 is a schematic block diagram illustrating a configuration of a control device.

FIG. 5 is a diagram showing a configuration of an operation panel.

FIG. 6 is a diagram showing a paper type selection screen.

FIG. 7 is a diagram showing a setting screen of a feed roller ON timing;

FIG. 8 is a view showing a setting screen of a feed roller OFF timing;

FIG. 9 is a diagram showing an example of an error screen.

FIG. 10 is a diagram showing an example of an error screen.

FIG. 11 is a flowchart illustrating an operation of setting a paper type.

FIG. 12 is a flowchart showing a feed ON timing setting operation;

FIG. 13 is a flowchart showing a sheet feeding OFF timing setting operation;

FIG. 14 is a flowchart showing a print speed setting operation.

FIG. 15 is a flowchart illustrating a printing operation.

FIG. 16 is a flowchart illustrating a sheet feeding operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper feed table 3 paper feed roller 6 electromagnetic clutch 16 registration roller 17 paper sensor 20 operation panel 40 control device 41 CPU 44 storage means

Continued on the front page F term (reference) 3F102 AA02 AA13 AB01 BB02 CB04 DA08 EA01 FA08 3F343 FA02 FB02 FB05 GA01 GB01 GC01 GD01 JA01 JD08 KA05 KA16 KB04 KB05 KB06 KB20 LC09 MA03 MA26 MA41 MB04 MB08 MB13 MB14 MB16 MB16

Claims (3)

[Claims] A plurality of sheets placed on a sheet feeding table are taken out one by one by a sheet feeding roller driven to rotate and conveyed to a registration roller, and the sheet is imaged at a predetermined time by the registration roller. A sheet feeding device configured to convey the sheet feeding roller to a forming unit; a setting unit configured to set at least one of timings of driving start and driving stop of the sheet feeding roller to a desired timing; and based on the timing set by the setting unit. And a control means for controlling the driving of the paper feed roller. 2. The sheet feeding device according to claim 1, wherein the setting unit is a unit that can set the timing according to a type of the sheet and a preset adjustment amount. 3. The apparatus according to claim 1, wherein the setting unit is a unit that can set the timing according to a type of the sheet, a preset adjustment amount, and a printing speed.
Paper feeder as described.