JPS6392536A - Paper feeding device - Google Patents

Abstract

PURPOSE:To enable the reverse line feed of a sheet of paper and improve performance by connecting a swingable first gear mechanism to a pickup roller and connecting and disconnecting a second gear mechanism for transmitting the turning force of a platen, to and from said first gear mechanism. CONSTITUTION:The captioned device has a swingable first gear mechanism which is connected to a pickup roller 1, a second gear mechanism for transmitting the turning force of a platen 14, and a connecting mechanism which swings the first gear mechanism to connect and disconnect it to and from the second gear mechanism. And, only when a sheet of paper is taken out of a paper cassette 2, the first and second gear mechanisms are connected to transmit the turning force of the platen 14 to the pickup roller 1. Accordingly, the turning force of the platen 14 is not transmitted to the pickup roller 1 except when a sheet of paper is taken out of the paper cassette 2 and the rotating direction of the platen 14 is made free, enabling the reverse line feed of a sheet of paper and improving performance.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding device in a printer device.

[Prior Art] Conventionally, a paper feeding device that is a paper feeding mechanism of a printer device is
It is constructed as shown in FIG. That is, by reversing the platen 14 of the printer section in the direction a shown in the figure, the pickup roller 25 is rotated in the direction b via the gears 21, 22, the belt 23, and the press-fitted pulley 24 of the one-way clutch. The paper is peeled off one sheet at a time from the paper cassette 26 using a peeling method using claws, and the paper is peeled off one by one from the paper cassette 26.
The paper is fed until the leading edge of the paper is caught between the paper and the platen 14. Thereafter, the platen 14 is rotated in the normal direction to draw the paper into the printer section, and after printing, the paper is discharged onto the stacker by discharge rollers 28 and 29.

The power of the platen 14 is transmitted from the platen 14 to the pickup roller 25 during the reverse rotation by the pulley 24 press-fitted in the one-way clutch, and when the platen 14 rotates in the forward direction, it is idle relative to the pickup roller 25, and the platen 14
The paper can be easily pulled out from the paper cassette 26 by the power of the paper cassette 26.

By repeating this operation, it has become possible to sequentially feed sheets one by one to the printer section and then discharge them.

[Problems to be Solved] In the above-described conventional paper feeding device, when the platen 14 is rotated in the forward direction, the pickup roller 25 is in an idling state when the paper is fed out, but when the platen 14 is rotated in the reverse direction, the paper is fed out from above the paper cassette 26. The disadvantage is that reverse line feeds cannot be performed.

[Means for Solving Problems] The present invention, which solves the above-mentioned conventional problems, provides a paper feeding device that sequentially sends paper to a printer section, which includes a paper cassette in which the paper is stored, and a pickup that sequentially takes out the paper from the paper cassette. a roller; a swingable first gear mechanism connected to the pickup roller;
a second gear mechanism that transmits the rotational force of the platen in the printer section; and a connection mechanism that swings the first gear mechanism and connects or disconnects the first gear mechanism and the second gear mechanism. the first gear mechanism and the second gear mechanism only when taking out the paper from the paper cassette.
A gear mechanism is connected to transmit the rotational force of the platen to the pickup roller.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of a paper feeding device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a pickup roller provided in a paper cassette 2, and a pick roller gear 3 and a gear arm 4 are attached to a shaft 1a of the pickup roller 1 outside the paper cassette 2. An idler gear 5 and a collar 6 are attached to the tip of the gear arm 4, and these gear trains constitute an oscillating gear train.

A cam 7 rotatable about a shaft 7a is brought into contact with a collar 6 attached to the tip of the gear arm 4. A solenoid 9 is connected to the cam 7 via a link arm 8. Further, the link arm 8 has a tension coil spring 11 whose one end is supported by the fixed part 10.
"The other end is attached.

Further, an idler gear 12 is further attached to the shaft 7a of the cam 7, and this idler gear 12 is connected to the shaft 14 of the platen 14 in the printer section via the same idler gear 13.
It meshes with a platen gear 15 attached to a. A pressure roller 16 is in contact with the platen 14,
It is designed to hold the paper sent from the paper cassette 2.

Next, the operation of the paper feeding device having the above configuration will be explained. Normally, when the platen gear 15 rotates, power is transmitted to the idler gear 12 via the idler gear 13, but the cam 7 provided coaxially with the idler gear 12 is provided via the link arm 8. An idler gear 5 provided coaxially with a collar 6 in contact with a cam 7 is pushed up by a bow length coil spring 11 of the bow 1. Therefore, as shown in FIG. 2, the idler gear 12 and the idler gear 5 are separated, and therefore, no power is transmitted to the big roller gear 3 that meshes with the idler gear 5.

Now, when there is a paper suction command, the solenoid 9 enters the suction state, and the solenoid 9 is connected to the link arm 8 connected to the cam 7.
The bow is long. Therefore, the cam 7 rotates as shown in FIG. 3, and the idler gear 5 coaxial with the collar 6 in contact with the cam 7 is pushed down, so that the idler gear 12 and the idler gear 5 mesh with each other.

Therefore, when the platen gear 15 rotates forward in the direction b shown in FIG. communicated. As a result, the pickup roller l rotates and the paper is sent out from the paper cassette 2. Paper is on platen 1
4 and the pressure roller 16, the solenoid 9 becomes open, and therefore the platen 14
The rotational force of is not transmitted to the pickup roller 1, so the rotation direction of the platen 14 is arbitrary.

In addition, in the oscillating gear train, the torsion spring 17
This applies a force in the biting direction to the idler gear 5.

In this way, in the paper feeding device of the present invention, the power of the platen 14 is picked up by setting the solenoid 9 to the suction state and moving the cam 7 to engage the idler t&4i-5 and the idler gear 12 only when feeding the paper to the printer section. The information is transmitted to the roller 1.

[Effects of the Invention] The paper feeding device of the present invention connects a swingable first gear mechanism to a pickup roller that takes out paper from a paper cassette, and a second gear mechanism that transmits rotational force between the gear mechanism and the platen. The rotational force of the platen is not transmitted to the pickup roller except when taking out paper from the paper cassette, and therefore the rotational direction of the platen can be changed by connecting or cutting the platen. By freeing up the lines, reverse line feeds can be performed on the paper, which has the effect of improving the performance of the printer device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a paper feeding device according to an embodiment of the present invention, FIGS. 2 and 3 are configuration diagrams for explaining the operation of the device shown in FIG. 1, and FIG. 4 is a conventional FIG. 3 is a perspective view showing a paper feeding device of FIG. 1: Pick up roller 2: Paper cassette 3: Big roller gear 4: tjM
Car arm 5: Idler gear 6: Collar
7 = Cam 8: Link arm 9: Solenoid 11: Bow 1 Bow length coil spring 12.13: Idler gear 14 Nibraten 15 Nibratin gear 16: Pressure roller

Claims (1)

[Scope of Claims] A paper feeding device that sequentially sends paper to a printer section, comprising: a paper cassette in which the paper is stored; a pickup roller that sequentially takes out the paper from the paper cassette;
A swingable first gear mechanism connected to the pickup roller, a second gear mechanism that transmits the rotational force of the platen in the printer section, and a first gear mechanism that swings the first gear mechanism. and a coupling mechanism for coupling or disconnecting the gear mechanism and the second gear mechanism, the first gear mechanism and the second gear mechanism being coupled only when taking out the paper from the paper cassette. . A paper feeding device, characterized in that the rotational force of the platen is transmitted to the pickup roller.