JPH0628502Y2 - Printer paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) This invention is a sheet feeding device of a printer configured to feed printing sheets stacked on a placing plate one by one to a printing mechanism section. Regarding

(Prior Art) Conventionally, as an apparatus of this type, a paper support roller is arranged at the leading end of a mounting plate, the leading end of the laminated printing paper is engaged with the peripheral surface of the roller, and , A paper feed roller that engages with the uppermost print paper and the paper support roller is provided, and by rotating the paper feed roller, the frictional resistance between the print papers and the frictional resistance between the print paper and the paper feed roller are reduced. It is known that only the uppermost printing sheet is supplied to the printing mechanism section based on the difference.

(Problems to be solved by the invention) However, in this conventional apparatus, since the friction resistance between the print sheet and the sheet support roller and the friction resistance between the print sheet and the sheet feed roller are almost the same, the second sheet is printed. When the paper is separated from the uppermost printing paper, there is a problem that the uppermost printing paper cannot be transported even if the paper feeding roller is rotated in the paper feeding direction.

The present invention has been made to solve the above problems, and an object thereof is to reliably bring laminated printing papers into contact with each other and reliably transfer the papers one by one to the printing mechanism section. It is to provide a paper feeding device of a printer capable of performing the above.

Configuration of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned object, in this invention, the mounting plate is vibratably disposed at the front end of the mounting plate and can be engaged with the front end of the printing paper. A vibrating roller and a front end of the printing sheet so as to be engaged with the front end of the printing sheet, the front and rear parts are rotatably arranged around an axis close to the front end of the mounting plate. A paper feed roller capable of transporting printing paper in cooperation with a vibrating roller, a drive motor that rotates the paper feed roller in forward and reverse directions, and the drive motor that is alternately rotated in forward and reverse directions for a predetermined number of times to feed the paper. By vibrating the vibrating roller via a roller, an operation of sequentially guiding the leading end of each of the stacked printing sheets between the rollers and rotating the drive motor in the forward direction to cause the sheet feeding roller to rotate. To rotate in the positive direction More, it is provided and performing drive control means repeating the operation of supplying the printing paper to the printing mechanism.

(Operation and effect) Therefore, in the present invention, the vibration roller is vibrated in accordance with a series of operations for supplying the uppermost printing paper among the laminated printing papers to the printing mechanism unit, and based on this, two sheets are vibrated. Eye print paper is inserted between the paper feed roller and the vibration roller,
Ensures surface contact with the topmost printing paper. Subsequently, if the paper feed roller is rotated by the drive motor, only the uppermost printing paper can be reliably supplied to the printing mechanism section.

Embodiment An embodiment embodying the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the printing mechanism unit 1 and the paper feeding device 2 are provided inside a frame (not shown) of the printer. A platen 3 that rotatably supports a single-cut printing sheet (hereinafter referred to as a sheet) P is rotatably arranged in the printing mechanism unit 1. The three guide rollers 6, 7 and 8 are platen 3
And is rotated following the platen 3. The print head 9 is moved back and forth along the platen 3,
Printing is performed on the paper P placed at the upper printing position.

The sensor 10 is disposed below the platen 3 and between the pair of guide rollers 6 and 7, and outputs a predetermined electric signal when the leading edge of the paper P is detected. A stacker 11 for stacking printed sheets P is provided above the printing mechanism unit 1.
And rollers 12 for feeding the paper P on the platen 3 to the stacker 11.

Next, the sheet feeding device 2 will be described.
Are rotatably supported in the frame by a rotary shaft 13a extending parallel to the platen 3. Vibration roller 1
A support shaft 14a extending substantially parallel to the platen 3 is oscillatably supported with some play with respect to the frame and engaged with the paper feed roller 13. The frictional resistance between the paper feed roller 13 and the paper P is set to be larger than the frictional resistance between the papers P.

The paper feed roller 13 is normally and reversely rotated by a step motor 15 as a drive motor shown in FIG. 2, and the vibrating roller 14 is vibrated in accordance with the normal and reverse rotation, and the leading end of the laminated paper P on the mounting plate L is rotated. Are sequentially guided between the rollers 13 and 14 along the outer circumference of the vibrating roller 14. Further, when the second sheet P is in surface contact with the uppermost sheet P, the sheet feeding roller 13 is rotated in the forward direction, so that the uppermost sheet P is printed based on the difference in the frictional resistance. The sheets are sequentially supplied to the mechanical unit 1 one by one. The platen 3 is the paper feed roller 1.
It is designed to rotate in conjunction with 3.

As shown in FIG. 2, the drive control means CPU 21, ROM 22 and RAM 23 in this embodiment are provided, and the ROM
22 stores a control program for the entire printer as shown in the flowchart of FIG. The paper detection signal output from the sensor 10 is input to the CPU 21 via the input / output port 24. Further, the CPU 21 outputs a drive signal to the motor 15 via the input / output port 24 based on the control program.

Next, the operation of the printer configured as described above will be described. Now, the control by the CPU 21 is started, and the paper P is guided between the paper feed roller 13 and the vibration roller 14 in steps S1 (hereinafter simply referred to as S1. The same applies to other steps) to S4 shown in FIG. The paper guiding operation for executing is executed. First, in S1, the motor 15 is rotated in the forward direction by a predetermined number of steps, and the paper feed roller 13 is rotationally driven in the paper feed direction (forward direction). Next, in S2, the motor 15 is rotated in the reverse direction by a predetermined number of steps, and the paper feed roller 13 is rotationally driven in the paper return direction (reverse direction) to set the initial state.

Subsequently, in order to surely insert the second sheet P from the top among the stacked sheets P on the mounting plate L between the rollers 13 and 14, the motor 15 is moved six times in small steps in S3. The paper feed roller 13
Is rotated forward and backward. At this time, the vibrating roller 14 is vibrated by the paper feed roller 13, the vibration is transmitted to the paper P, and the paper P moves along the outer periphery of the vibrating roller 14 between the rollers 13 and 14, and the leading end thereof is Rollers 13, 1
The sheet P is inserted between the four sheets, and surely comes into surface contact with the uppermost sheet P.

Next, in step S4, the front end of the paper P is moved to the rollers 13, 14
The motor 15 is rotated in the forward direction by a minute step so as to be reliably sandwiched between the paper feed roller 13 and the motor 15.
Is rotated in the positive direction, and the paper guiding operation ends.

In the next step S5, since the paper is fed to the printing mechanism unit 1, the motor 15 is rotated in the forward direction by a predetermined number of steps to rotationally drive the paper feeding roller 13, and the roller 13 and the vibrating roller 14 cooperate with each other. One sheet of paper P on the mounting plate L is transported toward the platen 3. On the other hand, since the platen 3 is rotated in the paper feed direction in conjunction with the paper feed roller 13,
When the front end of the paper P is transported by the paper feed roller 13 between the rear guide roller 7 and the platen 3, the front end of the paper P is engaged to feed the paper P. And the motor 15
Is stopped to stop the sheet feeding operation, and the leading edge of the sheet P is disposed between the rear guide roller 7 and the sensor 10.

Next, in S6, in order to align the front end of the paper P along the axis of the platen 3, the motor 15 is rotated in the reverse direction for a predetermined step, the platen 3 is rotated in the reverse direction, and the paper P is fed in the reverse direction.

Next, in S7, the same forward / reverse feed operation as in S3 is performed.
And the vibrating roller 14 is vibrated,
The next sheet P is sequentially moved toward between the rollers 13 and 14. Subsequently, in S8, in order to surely sandwich the leading end of the next sheet of paper P between the rollers 13 and 14, the above-described S4 is performed.
A forward feed operation similar to that in step 1 is performed.

Subsequently, in S9, the motor 15 is normally rotated by one step, and the sheet P is fed in the forward direction. In S10, the input of the sheet detection signal from the sensor 10 is waited, and in S11, it is determined whether or not the motor 15 is driven until the feed movement amount reaches a predetermined movement amount set in advance.

Then, the processes of S9 to S11 are repeated, and S10
If the determination result in is YES, the process proceeds to S13,
After the print head 9 is moved to the print start position, the paper P is sent in the forward direction to the print start line on the platen 3 in S14, and the setting of the paper P is completed.

On the other hand, when the determination of S11 is NO during the processing operations of S9 to S11, that is, when the paper P is not transported to the platen 3 even if the predetermined feeding operation is performed,
In S12, an error display is performed by a display device (not shown).

As described above, in this embodiment, the paper feed roller 13 rotated by the step motor 15 causes the vibration roller 14 to vibrate, and based on this, the second uppermost sheet on the mounting plate L is vibrated. Since the sheet P is inserted between the sheet feeding roller 13 and the vibrating roller 14, the second sheet P is surely brought into contact with the uppermost sheet P. Therefore, by the subsequent rotation of the paper feed roller 13, only the uppermost paper P can be reliably supplied to the print mechanism unit 1.

Further, in this embodiment, since the step motor 15 for driving the sheet feeding roller 13 is also used as the driving means for the vibrating roller 14, the number of parts can be reduced and the manufacturing can be performed at low cost.

The present invention is not limited to the above-described embodiment, and it is possible to provide a dedicated drive means for vibrating the vibrating roller 14, for example.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a printer embodying the present invention,
FIG. 2 is a block diagram showing a printer control device, and FIG. 3 is a flowchart. In the drawing, 1 ... Printing mechanism section, 13 ... Paper feed roller, 14 ... Vibration roller, 15 ... Step motor as drive motor, P
... printing paper, L ... placement plate.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65H 3/62 8712-3F

Claims (1)

[Scope of utility model registration request] 1. A sheet feeding device of a printer, wherein printing sheets (P) stacked on a placing plate (L) are fed one by one to a printing mechanism section (1). A vibrating roller (14) disposed vibratably at the tip of (L) and engageable with the tip of the printing paper (P).
And so as to be able to engage with the front end of the printing paper (P), the front and rear plates are arranged so as to be rotatable forward and backward around an axis close to the front end of the mounting plate (L). Along with the rotation, the paper feed roller (13) that transfers the print paper (P) to the print mechanism unit (1) in cooperation with the vibrating roller (14) and the paper feed roller (13) rotate in the forward and reverse directions. And a drive motor (15) for rotating the drive motor (15) alternately in both forward and reverse directions for a predetermined number of times, and vibrating the vibrating roller (14) through the paper feed roller (13) to stack the layers. The leading end of each printed sheet is attached to both rollers (13, 1).
4) during the sequential induction operation, and the drive motor (1
5) is rotated in the forward direction and the paper feed roller is rotated in the forward direction, and drive control means for repeatedly performing the operation of supplying the print sheet to the print mechanism section (1) is provided. A paper feeding device for a printer.