JPH01118469A - Sheet feeder - Google Patents

Abstract

PURPOSE:To preferably and effectively feed a sheet by evacuating a sheet stopper, and then rotating a driving roller in a sheet feeding direction to feed the sheet to the side of a printing head. CONSTITUTION:An opening/closing mechanism 16 has a roller supporting arm 19 formed with a protrusion piece 19a. When a friction roller 15 is isolated from a driving roller 13, a sheet stopper 11 is moved by the piece 19a to a sheet holding position, a sheet P is set on the stopper 11, and a sheet feeding operation is started, a cylinder unit 17 is driven by a controller 18 to hold the sheet P. Then, when a plunger 17a is moved, the piece 19a is moved, the stopper 11 is moved by a coil spring to be evacuated from a sheet feed passage, the roller 13 is rotated in a direction for isolating the sheet P from the stopper 11, returned at a predetermined length and then stopped. A driving roller 3 is rotated to feed the sheet P to the side of a printing head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a paper feeding device that is attached to a printer and feeds a predetermined paper to the print head side of the printer.

(Prior Art) In recent years, paper feeding devices have been used to supply paper to printers.

Examples of such paper feeding devices include the following.

FIG. 5 is a diagram showing an example of a paper feeding device.

In the figure, 1 is a paper stopper that is rotatably biased in the direction of arrow A by a coil spring 2, 3 is a drive roller that sends the supplied paper P, 4 is a motor that rotationally drives the drive roller 3, and 5 is a A friction roller is provided to be able to approach and separate from the drive roller 3 via the paper P, 6 is an opening/closing mechanism for opening and closing the paper stopper 1 and the friction roller 5, and 7 is a plunger 7a for driving the opening/closing mechanism 6. 8 is a control unit that controls the operation of the motor 4 and the cylinder device 7.

The above-mentioned opening/closing mechanism 6 includes a projecting piece 9a that rotatably supports the friction roller 5 at one end and contacts the paper stopper 1 at the other end to move the paper stopper 1 to the paper holding position.
A roller support arm 9 in which a bracket 9b is not formed in the center, and a bracket 9 of this roller support arm 9.
The connecting arm 10 is connected to the connecting arm 10, and the distal end of the connecting arm 10 is rotatably connected to the distal end of the plunger 7a of the cylinder assembly W7. Note that the plunger 7a
The tip of is biased in the direction of arrow B by a spring 11.

The operation of the paper feeding device configured as described above will be explained using the flowchart shown in FIG.

First, the friction roller 5 is separated from the drive roller 3, and the protruding piece 9a of the roller support arm 9 causes the paper stopper 1 to
is moved to the paper holding position (step 1). Next, the paper is set on the paper stopper 1 (step 2). After this, the sheet feeding operation is started by the operator's button operation or by the sensor (step 3). As a result, the cylinder device 7 is driven by the control unit 8, the plunger 7a is moved, the friction roller 5 is moved toward the drive roller 3, and the paper P is clamped (step 4). Next, when the plunger 7a is moved, the protruding piece 9a of the roller support arm 9 moves, and the paper stopper 1 is moved in the direction of arrow A by the coil spring 1a and retreated from the paper feeding path (
Step 5).

Thereafter, the drive roller 3 is rotated by the motor 4, and the paper P is sent to the print head side (not shown) (step 6).

By the way, in the paper feeding device described above, the paper P is set on the paper stopper 1, and the friction roller 5
is moved to the drive roller 3 side and the paper P is sandwiched,
In this state, the paper stopper 1 is moved to retreat from the paper feed path, and the drive roller 3 is rotated to feed the paper P to the print head side (not shown), but as shown in FIG. There was a risk that the leading edge of the P would get caught on the paper stopper 1, resulting in paper feeding failure.

(Problems to be Solved by the Invention) The present invention attempts to solve the above-mentioned problems that may occur, and aims to provide a paper feeding device that can feed paper well and reliably. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a paper feeding device that is attached to a printer having a print head and that feeds paper printed by the print head. A drive roller that is driven when feeding the paper and sending it out in conjunction with a printing operation, a driven roller that is provided so as to be able to approach and separate from the drive roller via the paper, and a driven roller that is attached to the drive roller when the paper is supplied. a paper stopper that holds the paper at a predetermined position and can be retracted when the paper is fed to the print head side by the drive roller and the driven roller; when the paper stopper is retracted, the drive roller and The drive roller is rotated in a direction opposite to the paper feed direction so that the paper held by the driven roller is separated from the print head by a predetermined distance, and after the paper stopper is retracted, the drive roller is rotated so that the paper is moved away from the print head by a predetermined distance. The paper is rotated in the feeding direction to feed the paper to the print head side.

(Function) The present invention rotates the drive roller in the opposite direction to the paper feed direction so that the paper held by the drive roller and the driven roller is separated from the print head by a predetermined distance, and the paper stopper is retracted. After that, the drive roller is rotated in the paper feeding direction to feed the paper toward the print head, so that the paper can be fed well and reliably.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a side view for explaining a paper feeding device according to an embodiment of the present invention.

In the figure, 11 is a paper stopper that is rotatably biased in the direction of arrow A by a coil spring 12, 13 is a drive roller that sends the supplied paper P, 14 is a motor that rotationally drives the drive roller 13, and 15 is a paper stopper that is rotatably provided. A friction roller 16 is provided so as to be able to approach and separate from the drive roller 13 via the paper P, and reference numeral 16 indicates the paper stopper 11 and the friction roller 1.
5 is an opening/closing mechanism for performing opening/closing operations; 17 is an opening/closing mechanism 1;
A cylinder device 18 has a plunger 17a for driving the motor 14, and a control unit 18 controls the operation of the motor 14 and the cylinder device 17.

The opening/closing mechanism 16 described above has a friction roller 1 at one end.
A roller support arm 19 is formed with a protrusion 19a for rotatably supporting the paper 5, and has a protrusion 19a formed at the other end for moving the paper stopper 11 to the paper holding position by contacting the paper stopper 11, and a bracket 19b formed at the center; Roller support arm 1
The connecting arm 20 is connected to the bracket 19b of 9, and the tip of the connecting arm 20 is connected to the cylinder device 17.
The plunger 17a is rotatably connected to the tip of the plunger 17a. Note that the tip of the plunger 17a is biased in the direction of arrow B by a spring 21.

The operation of the paper feeding device configured as described above will be explained using the flowchart shown in FIG.

First, the friction roller 15 is separated from the drive roller 13, and the paper stopper 11 is moved to the paper holding position by the projection piece 19a of the roller support arm 19 (step 11).
). Next, the paper P is set on the paper stopper 11 (step 12). After this, the paper feed operation is started by the operator's button operation or sensor (step 1).
3).

As a result, the cylinder device 17 is driven by the control unit 18, the plunger 17a is moved, the friction roller 15 is moved toward the drive roller 13, and the paper P is clamped (step 14). Next, when the plunger 17a is moved, the protruding piece 19a of the roller support arm 19 moves, and the paper stopper 11 is moved in the direction of arrow A by the coil spring lla and retreated from the paper feed path (step 15).
.

Then, as shown in FIG. 3, the driving roller 13 is rotated by the motor 14 in a direction in which the paper P is separated from the paper stopper 11 (the paper P is separated from the print head side (not shown)), so that the paper P is moved to a predetermined position. It is sent back by the length of and stops (step 16). Note that the length of this return is shorter than the distance between the paper stopper 11 and the drive roller 13, as shown in FIG. Therefore, in this state, the leading edge of the paper P and the paper stopper 11 are separated by a predetermined distance.

After that, as shown in FIG. 4, the drive roller 3 is rotated by the motor 4 in the forward direction in which the paper P is sent to the print side, and the paper P is sent to the print head side (not shown) (step 17). .

Note that the above-described operations are controlled by the control section 18.

Therefore, in this embodiment, after the paper P is set on the paper stopper 11 and the friction roller 15 is moved to the driving roller 13 side to nip the paper P, the paper stopper 11 is moved to retreat from the paper feed path. Then, after the paper P was returned in the direction away from the printing side, the drive roller 13 was rotated forward and the paper P was sent to the print head side (not shown), so that the leading edge of the paper P and the paper The paper P can be smoothly and reliably fed to the print head side without being caught by the stopper 11.

In the above-described embodiments, the paper P may be a cut sheet or a multi-copy paper (copy paper) slip.

[Effects of the Invention] As explained above, the paper feeding device of the present invention moves the driving roller in the opposite direction to the paper feeding direction so that the paper held by the driving roller and the driven roller is separated from the print head by a predetermined distance. After the paper stopper is retracted, the drive roller is rotated in the paper feeding direction to feed the paper toward the print head, so that the paper can be fed smoothly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a side view for explaining a paper feeding device according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the paper feeding device in FIG. 1, and FIGS. 1, FIG. 5 is a diagram showing an example of the paper feeding device, FIG. 6 is a flowchart to explain the operation of the paper feeding device in FIG. 5, and FIG. FIG. 6 is a diagram for explaining locations where problems may occur in the paper feeding device of FIG. 5; 11... Paper stopper, 13... Drive roller, 15
...Friction roller, 16...Opening/closing mechanism, 17
... Cylinder device, 18... Control section. Applicant Toshiba Corporation Patent Attorney Sasa Suyama - Figure 1 Figure 5

Claims (1)

[Claims] (1) In a paper feeding device that is attached to a printer having a print head and feeds paper to be printed by the print head, a drive roller that is driven when feeding the paper and feeding the paper along with printing operation, and this drive roller a driven roller that is provided so as to be able to approach and separate from the paper via the paper; and a driven roller that holds the paper at a predetermined position when the paper is supplied and moves the paper toward the print head side by the drive roller and the driven roller. a paper stopper that can be retracted when the paper stopper is fed, and the drive roller is configured such that the paper held by the drive roller and the driven roller is separated by a predetermined distance from the print head side when the paper stopper is retracted. A paper feeding device characterized in that the roller is rotated in a direction opposite to the paper feeding direction, and after the paper stopper is retracted, the driving roller is rotated in the paper feeding direction to feed the paper toward the print head side. Device.