JPS62249832A - Sheet feeding method for recording device - Google Patents

Abstract

PURPOSE:To prevent an increase in load without decreasing a paper feed speed when a sheet is transported, by driving an driving motor of a cut sheet feeder intermittently. CONSTITUTION:Although a sheet transportation roller 1 and a paper feed roller 2 are driven at the same time, the sheet transportation roller 1 is rotated continuously and the paper feed roller is rotated intermittently so that a sheet is transported from C to D. While the front edge of a sheet 9 is between the position D of a front pinch roller 6 and the position E where recording starts, the drive motor for a cut sheet feeder stops and only the sheet transportation roller 1 is driven to transport the sheet 9. When the sheet 9 is positioned at the recording start position E, a recording head is used and only the sheet transportation roller 1 is turned a prescribed pitch for effecting the line feed of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a sheet feeding method for a recording apparatus having a cut sheet feeder.

[Prior art]

2. Description of the Related Art Recording devices such as printers and facsimiles are sometimes equipped with a cut sheet feeder (automatic paper feeding device) that automatically feeds cut sheets into the recording device.

FIG. 1 is a schematic cross-sectional view illustrating the sheet feeding operation of this type of recording apparatus.

Conventionally, in this type of recording apparatus equipped with a cut sheet feeder, from the leading edge A of the sheet 3 loaded on the cut sheet feeder (CSF) to the contact point C between the sheet feed roller 1 and the rear pinch roller 5 in the recording apparatus. Sheet conveyance is performed by stopping the sheet feed roller 1 to eliminate skew of the sheet, and driving the paper feed roller 2 with the drive motor of the cut sheet feeder. Conveyance to tip position E is as follows:
This was done by stopping the drive motor of the cut sheet feeder and driving the sheet feed roller 1.

However, in such a sheet feeding operation, since the paper feed roller 2 is still in pressure contact with the sheet when conveying the sheet from position C to position E, the load on the conveying force of the sheet feeding roller 1 is large, and the sheet feeding There was a problem in that the recording start position E could not be accurately positioned due to slipping between the roller I and the sheet.

Therefore, a method can be considered in which the sheet feeding load is reduced by driving the paper feed roller 2 at the same time when the sheet is transported from the position C of the rear pinch roller 5 to the recording start position E. However, in such a method, The sheet feeding speed of the sheet feeding roller l of the recording device and the paper feeding roller 2 of the cut sheet feeder must be made to match, and the sheet feeding speed from position A to position C must match the sheet feeding speed of the sheet feeding roller 1 of the printing device. There was a problem in that it was difficult to increase the paper feeding speed because it was determined by the feeding speed.

That is, in order to increase the paper feeding speed from position A to position C, it is necessary to switch the speed of the cut sheet feeder's drive motor between A and C and between C and E. The control becomes complicated, and since the drive motor cannot always be driven at the optimum rotation speed, there are problems such as generation of noise, reduction in efficiency, and increase in heat generation.

[Objective] An object of the present invention is to provide a sheet feeding method for a recording apparatus that can prevent an increase in load during sheet feeding without reducing the paper feeding speed of a cut sheet feeder.

[Means to achieve the purpose]

The present invention provides a method for continuously driving a sheet feed motor of the recording apparatus and intermittently driving a drive motor of the cut sheet feeder when conveying a cut sheet to a recording start position in a recording apparatus having a cut sheet feeder. There are ways to achieve the above objectives.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

First, a sheet feeding method of a recording apparatus with a cut sheet feeder according to an embodiment of the present invention will be explained using FIG. 1 mentioned above.

In FIG. 1, the topmost sheet 9 of the sheet bundle 3 loaded on the cut sheet feeder is driven by the paper feed roller 2 of the cut sheet feeder by a drive motor (not shown) (stepping motor mounted on the cut sheet feeder). As a result, only one sheet is separated from the sheet bundle 3 and conveyed from the leading end A of the sheet bundle 3 to the position C of the rear pinch roller 5. At this time, since the sheet feed motor (not shown) of the recording apparatus is stopped, the sheet feed roller 1 (which also serves as a platen in the example of FIG. 1) driven by this motor is also stopped.

Therefore, the leading edge of the sheet 9 fed by the paper feed roller 2 hits the intersection of the sheet feed roller l and the rear pinch roller 5 and is slightly bent, thereby correcting the skew of the sheet 9. .

In this way, the leading edge of the sheet 9 is positioned at the position C of the rear pinch roller 5.
After reaching the sheet 9, the sheet feed motor of the recording device is driven to rotate the sheet feed roller l.
is transported to the recording start position E.

However, according to the control method of the present invention, during the period from the position C of the rear pinch roller 5 to the position of the front pinch roller 6,
The sheet 9 is conveyed by continuously driving the sheet feed motor and by intermittently driving the cut sheet feeder drive motor (motor that drives the paper feed roller 2). That is, sheet feed roller 1 and paper feed roller 2 are driven at the same time (overlapping timing), but sheet feed roller 1 is rotated continuously and paper feed roller 2 is rotated intermittently. By this,
Sheet transport between CD and D is performed.

While the leading edge of the sheet 9 reaches from the position of the front pinch roller 6 to the recording start position E, the drive motor of the cut sheet feeder is stopped, the paper feed roller 2 is stopped, and only the sheet feed motor is driven to feed the sheet. This is done by rotating only the feed roller 1.

When the sheet 9 is positioned at the recording start position, the recording head 7 is used to change the sheet by rotating only the sheet feed roller 1 at a predetermined pitch.

The sheet feeding method of the recording apparatus according to the present invention has been described above, and FIG. 2 is a timing chart of this sheet feeding operation.

The above control operation will be specifically explained below with reference to FIG.

In FIG. 2, the uppermost sheet 9 of the sheet bundle 3 is separated from the leading edge A of the sheet bundle and the rear pinch roller 5 intersects C.
The operation of conveying the sheet up to the cut sheet feeder is performed by driving the drive motor (stepping motor) of the cut sheet feeder, while the sheet feed motor (therefore, the sheet feed roller l) is stopped.

Therefore, as described above, the leading edge of the sheet 9 hits the intersection between the sheet feed roller 1 and the rear pinch roller 5 and is slightly bent, thereby correcting the skew of the sheet 9.

The intersection point C of the next rear pinch roller 5 and the front pinch roller 6
Between the intersection point and the intersection point, only the rear pinch roller 5 presses the sheet 9 against the sheet feed roller 1, and the conveying force of the sheet 9 cannot be made sufficiently large.

In addition, the paper feed roller 2 is still in pressure contact with the sheet 9, and when the paper feed roller 2 is stopped, this becomes a load on the conveying force of the sheet feed roller l, causing slippage between the sheet feed roller 1 and the sheet 9. Sheet 9 at printing start position E may be caused by
positioning may become inaccurate and unstable.

By the way, according to the sheet feeding method of the present invention, C-
Sheet conveyance between points D is carried out by continuously driving the sheet feed motor and intermittently driving the drive motor of the cut sheet feeder.

That is, this is done by driving both motors simultaneously while ramping them intermittently.

For example, when setting the feed speed of paper feed roller 2 to three times the feed speed of sheet feed roller L so that the paper feed speed of the cut sheet feeder is sufficiently fast, the sheet feed motor should be set as shown in Figure 2. The drive motor of the cut sheet feeder is driven continuously for T seconds between CD and D, and the drive motor of the cut sheet feeder is driven for T/6 seconds, stopped for 773 seconds, and then driven for T/6 seconds, and is then driven for 773 seconds.
It is driven intermittently so that the driving time is reduced to one-third by stopping for 73 seconds.

Between the next intersection of the front pinch rollers 6 and the recording start position E, as shown in FIG. Since the sheet 9 is conveyed by driving, the sheet 9 can be accurately positioned with respect to the recording start position E.

Moreover, since the sheet 9 is brought into pressure contact with the sheet feed roller 1 by both pinch rollers 5 and 6 between D-2, a sufficient conveying force can be applied to the sheet.

FIG. 3 is a block diagram of a control system suitable for controlling the sheet feeding operation described above.

In FIG. 3, a control circuit (CPU) 1 of the recording device 10
1 is connected to a control diagram (CPU) 31 of a host machine 30 such as a computer via an interface 12.12, and is also connected to a drive motor 41 of a cut sheet feeder 40 via a connector 13.

The control system of the recording device 10 includes the control circuit 1 as shown in the figure.
1 to the data/control bus 14, the ROM 15
and RAM 16, the recording head 7 is connected via a head driver (drive circuit) 17, the recording head feed motor 20 is connected via a head feed motor driver 19, and the sheet feed motor 22 is connected via a sea path motor driver 21. , the ALARM lamp 24 is connected to the ALARM lamp 24 via the ALARM lamp driver 23 , and the sheet absence detection sensor 4 is connected via the sheet sensor interface 25 , and the cut sheet feeder is connected via the drive motor driver 27 and the connector 13 . 41 drive motor 41.

FIG. 4 shows the third step when carrying out the sheet feeding method of the recording apparatus according to the present invention explained with reference to FIGS. 1 and 2.
3 is a flowchart illustrating an operation procedure of the control system shown in the figure. Note that symbols A to E in FIG. 4 indicate positions corresponding to positions A to H of the leading edge of the sheet 9 in FIGS. 1 and 2.

In FIG. 4, when the automatic sheet feeding starts in step 100, the drive motor of the cut sheet feeder (C3F) is started in step 7 step 101, and in the next step 102, the sheet out detection sensor turns on the cut sheet feeder (C3F) when there is no sheet. ) is detected.

If it is ON, that is, if there is a sheet, the process advances to step 103 and an error display is performed.

If YES, that is, if there is no sheet, the process advances to step 104, where both the drive motor 41 of the cut sheet feeder 40 and the sheet feed motor 22 are driven.

After the set time has elapsed, the process proceeds to step 105, where the sheet feed motor 22 continues to be driven, but the drive motor 41 is temporarily stopped.

After the next set time has elapsed, the process proceeds to step 106, where the drive motor 41 is turned on and both motors 22, 41 are simultaneously driven again.

Further, after the set time has elapsed, the process proceeds to step 107, and the drive motor 41 is stopped.

Next, the process advances to step 108 and the sheet feed motor 22
By driving only the front pinch roller 6, the sheet is fed from the intersection of the front pinch rollers 6 to the starting position E.

When the recording start position is reached (step 109), the sheet feed motor 22 is stopped.

With the above steps, the sheet feeding operation to the recording start position E is completed (step 110), and the recording operation normally proceeds to drive the recording head 7.

By implementing the sheet feeding method described above, the following effects can be obtained.

(1) Since the sheet feed roller 2 is simultaneously driven to feed the sheet intermittently, the load on the sheet feed roller l can be reduced, and the sheet 9 can be accurately positioned to the recording start position. Became.

(2) By changing the driving time of the drive motor of the cut sheet feeder, the paper feeding speed (speed of paper feeding roller 2) can be set to be faster regardless of the sheet feeding speed of the recording device, and when feeding cut sheets. It was possible to shorten the overall operating time.

(3) By appropriately setting the reduction ratio of the sheet feed roller 1 and paper feed roller 2, it has become possible to drive the two motors at the same rotation speed.

(4) Since there is no need to change the rotation speed of the drive motor of the cut sheet feeder, efficiency can be improved, noise can be kept low, and heat generation can be further reduced.

〔effect〕

As is clear from the above description, according to the present invention, without reducing the paper feeding speed of the cut sheet feeder,
Provided is a sheet feeding method for a recording device that can prevent an increase in load during sheet feeding and reduce noise and heat generation of a drive motor of a cut sheet feeder.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional view illustrating the sheet feeding operation of a recording apparatus, FIG. 2 is a timing chart of a sheet feeding method according to an embodiment of the present invention, and FIG. 3' is a diagram suitable for carrying out the present invention. FIG. 4 is a block diagram of a control system, and is a flowchart illustrating an operational procedure for implementing the present invention. 1-...---Sheet feed roller, 2--...--
---・Paper feed roller, 9-----1・-・-・sheet,
22-・-1-- Sheet feed motor, 4fl-
・・・−・−・−Cut sheet feeder, 41・−・
・・・－・－・Drive motor.

Claims (1)

[Claims] (1) In a recording device having a cut sheet feeder, when conveying a cut sheet to the recording start position,
A sheet feeding method for a recording device, characterized by continuously driving a sheet feeding motor of the recording device and intermittently driving a drive motor of a cut sheet feeder.