JPS6382242A - Recording paper feeding method for image recording device - Google Patents

Abstract

PURPOSE:To make a device compact and feed recording paper at a high speed without any occurrence of a wrinkle, an edge bend and the like by stopping temporarily paper feed when the recording paper has jumped over a separation claw, and resuming the paper feed when the leading end of the recording paper has restored an original state. CONSTITUTION:Recording paper 11 on a recording paper cassette 12 is pressed in a face direction with a recording paper delivery means 14. The recording paper 11 is further pressed with the leading end 30 thereof hooked to a separa tion claw 16 and the leading end 30 warps. And when the leading end 30 has jumped over the separation claw 16 by the help of an impact resilient force, the delivery means 14 is temporarily stopped. And when the warped leading end 30 has restored an original state due to the elasticity thereof, the delivery means 14 again operates and feeds out the recording paper 11 from the record ing paper cassette 12. According to the aforesaid constitution, an installation space can be saved and the recording paper 11 can be carried at a high speed without any occurrence of a wrinkle, an edge bend and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording paper feeding method for an image recording apparatus that feeds recording paper cut to a fixed length from a storage cassette.

2. Description of the Related Art Conventionally, in an image recording apparatus that uses recording paper cut to a fixed length, recording paper 1 is placed in a recording paper storage cassette 2 in advance, as shown in FIG. 3, for example. A spring 3 is provided at the bottom of the recording paper storage cassette 2, and this spring 3 urges the recording paper 1 upward. A paper feed roller 4 is provided on the recording paper 1, and the upper sheet of the biased recording paper 1 comes into contact with the paper feed roller 4.

When the paper feed roller 4 rotates in the direction of arrow A, the upper recording paper 1 is pushed in the direction of the arrow by the frictional force of the paper feed roller 4 and moves. Then, the leading end of the moved recording paper 1 is locked by a separating claw 5 provided on the recording paper storage cassette 2. Furthermore, when the paper feed roller 4 rotates, the leading edge of the recording paper 1 is pushed while being locked by the separating claw 5, and the leading edge of the recording paper 1 is bent. On the other hand, a repulsive elastic force is generated along with the pressure, and the leading end of the recording paper 1 overcomes the separating claw 5 due to the repulsive elastic force. Furthermore, the paper feed roller 4 is operated, and the recording paper 1 is fed out of the recording paper storage cassette 2 via the separating claw 5.

A pair of conveyance rollers 6 are arranged in the direction of arrow B of the recording paper storage cassette 2, and the recording paper 1 sent out from the recording paper storage cassette 2 is conveyed to the recording means 7 while being held between the pair of conveyance rollers 6. be done.

This recording means 7 forms an image on the recording paper l based on predetermined image information. Thereafter, the recording paper 1 on which the image has been formed is discharged from the image recording apparatus by the discharge roller 8.

Problems to be Solved by the Invention By the way, in this method of feeding the recording paper 1, when the recording paper 1 is separated from the separating claw 5, the leading edge of the recording paper 1 becomes unstable, as shown in FIG. As shown in the figure, irregular deflections 9 occur.

On the other hand, in image recording apparatuses, there is a strong demand for higher recording speeds and space saving, as is evident in desktop type models often used in facsimile/millimeter machines. To help increase the speed of recording and save space, a conveyance roller 6 is disposed as close as possible to the recording paper storage cassette 2.

However, by arranging the conveyance roller 6 very close to the separation claw 5, the deflection 9 that occurs when the recording paper 1 is separated from the separation claw 5 is prevented from returning to its original state.
may reach the conveyance roller 6, causing the recording paper 1 to be wrinkled or folded.

That is, in the method described above, in which the recording paper 1 is sent out from the recording paper storage cassette 2 using the separating claw, the recording paper 1 is separated from the separating claw 5 by the repulsion elastic force generated as the recording paper 1 is pressed. However, recording paper 1 with low rigidity
When using the recording paper 1, the deflection 9 that occurs when the recording paper 1 is separated from the separation claw 5 is not easily recovered, and the recording paper 1 is wound around the conveyance roller 6 before it is recovered, resulting in wrinkles and edges. This may cause folding or jamming.

The present invention has been made in view of the above-mentioned problems, and is an image recording method that allows recording paper to be conveyed at high speed without impairing space saving and without causing wrinkles, folded edges, or so-called jams. The purpose of this invention is to provide a recording paper feeding method for an apparatus.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has the following objective: until the leading edge of the top sheet of recording paper placed in the recording paper cassette passes over the separating claw provided on the recording paper cassette. The recording paper is pressed in the plane direction by the recording paper feeding means, and when the leading edge of the recording paper passes the separating claw, the pressing by the feeding means is temporarily stopped, and then the recording paper is pushed again. It is characterized in that it is fed out from the recording paper cassette by pressing in the surface direction.

Operation: The upper sheet of recording paper placed in the recording paper cassette is pressed in the plane direction by the recording paper feeding means. With the leading edge of the recording paper being locked by the separation claw, the recording paper is further pressed by the recording paper feeding means, and the leading edge of the recording paper is bent. On the other hand, when the leading end exceeds the separating claw due to the repulsion elastic force generated by the pressing, the recording paper feeding means is temporarily stopped. When the leading edge of the bent recording paper returns to its normal state due to its elastic force, the recording paper feeding means is operated again to press the recording paper in the surface direction and send it out from the recording paper cassette.

Embodiment FIG. 1 is a schematic diagram showing a facsimile IJ apparatus to which a recording paper feeding method for an image recording apparatus according to an embodiment of the present invention is applied.

This facsimile 7mm device uses recording paper 11 cut to a fixed length.
It has a recording paper storage cassette (hereinafter referred to as a recording paper cassette) 12 in which a recording paper storage cassette (hereinafter referred to as a recording paper cassette) is placed. A spring 13 is arranged at the bottom of the recording paper cassette 12, and this spring 13 urges the recording paper 11 placed on the spring 13 upward. A paper feeding roller 14 as a recording paper feeding means is disposed on the recording paper cassette 12, and the upper sheet of the recording paper 11 is brought into pressure contact with the paper feeding roller 14 by the bias of the spring 13. There is. Paper feed roller 14 is driven by motor 15 and rotated in the direction of arrow C.

In FIG. 1, the motor 15 is shown as one block for convenience, but this motor 15 drives one liner roller 1.
Various rollers including rollers 4 and 4, which will be described later, are driven.

Then, when the paper feed roller 14 rotates with the upper sheet of the recording paper 11 being pressed, the recording paper 11 is pressed by frictional force in the direction of the arrow along the surface direction, and the recording paper 11 is recorded in the pressing direction. The recording paper 1 mounted on the end of the paper cassette 12 is
A substantially hook-shaped separation claw 16 is provided so as to lock the upper edge of 1.

Further, a position detection sensor 17 for detecting the presence of the recording paper 11 is provided near the top of the separation claw 16. Further, a motor control section 19 is connected to this position detection sensor 17 via a sensor circuit 18, and the detection information of the position detection sensor 17 is transmitted via the sensor circuit 18 to a motor control path 19.
It is now entered into Furthermore, the motor control section 19 is connected to the motor 15 and the position detection sensor 1
The motor 15 is controlled based on various information including the detection information of 7 to drive various rollers.

A guide plate 20 is located very close to the separation claw 16 in the direction of the arrow.
A conveyance row 221 is disposed via the conveyance row 221. A pinch roller 22 is disposed approximately in contact with the conveyance roller 21, and the recording paper 1 is placed between the pinch roller 22 and the conveyance roller 21.
1 is inserted, and the conveyance roller 21 rotates in the direction of arrow E, so that the recording paper 11 is conveyed.

A guide plate 2 is provided in the direction in which the recording paper 11 is conveyed by the conveyance roller 21.
A platen roller 24 is provided via 3. A thermal head 25 is disposed opposite the platen row 224. The thermal head 25 forms an image on the recording paper 11 based on both signals sent by the sending facsimile machine. Recording paper 11 on which an image is formed by the thermal head 25
is being removed from here. A discharge roller 27 is disposed in this discharge direction via a guide plate 26.

In the facsimile machine configured as described above, the recording paper 11 is placed in the recording paper cassette 12 prior to reception.

Then, the recording paper 11 is pressed against the paper feed roller 14 by the spring 13 . In this state, when the motor control section 19 controls the monitor 15 to rotate the paper feed roller 4, the upper sheet of recording paper 11 is pushed in the direction of the arrow along the plane by frictional force.

The recording paper 11 moves in the direction of the arrow, and its leading end reaches the separation claw 16. When the paper feed roller 14 further rotates in this state, the leading end of the recording paper 11 bends 30 as shown in FIG. On the other hand, a repulsive elastic force is generated as the recording paper 11 is pressed, and when this repulsive elastic force reaches a predetermined value, the leading end of the recording paper 11 overcomes the separating claw 16 . Then, the position detection sensor 17 detects that the leading edge of the recording paper 1 has climbed over the separation claw 16. This detection information is sensor circuit 1
8 to the motor control unit 19.

Based on this detection information, the motor control unit 19 temporarily stops the rotation of the paper feed roller 14. Then, after a predetermined period of time has elapsed and the leading edge of the recording paper 11 is restored to its normal state as shown as the recording paper 111 in FIG. 2, the paper feed roller 14 is rotated again.

Thereafter, the recording paper 11 is guided by the guide plate 20 and reaches the thermal head 25 via the conveyance roller 21 and the pinch roller 22. Here, an image is formed on the recording paper 11 based on the image information sent from the sending side. After the recording paper 11 on which the image has been formed is carried out from the thermal head 25, it is discharged to the outside of the facsimile machine by a discharge roller 27.

In this embodiment, an example of application to a facsimile machine has been described, but the present invention is not limited to this, and may be applied to a copying machine or the like. Furthermore, it goes without saying that the present invention is not limited to desktop type image recording apparatuses, but can also be applied to stand assembly type image recording apparatuses that are often used in copying machines and the like.

Effects of the Invention As explained above, the present invention temporarily stops feeding the recording paper at the stage when the recording paper passes over the separating claw, and when the leading edge of the recording paper returns to its original state, the recording paper is removed. Since the recording paper is fed out to the conveyance roller in a fully exposed state without increasing the distance between the conveyance roller and the separation claw, the device can be made more compact, and wrinkles and folded edges can be avoided. Alternatively, the recording paper can be fed at high speed without causing so-called jams.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of a facsimile machine to which an embodiment of the present invention is applied, Fig. 2 is a perspective view showing the recording paper conveyance state of the facsimile machine, and Fig. 3 is a conventional paper feeding state. A schematic diagram showing an image recording device to which an example of the method is applied;
FIG. 4 is a perspective view showing the state of conveyance of recording paper in the image recording apparatus. 11... Recording paper, 12... Recording paper storage cassette, 1
4... Paper feed roller, 15... Motor, 16... Separation claw, 17... Position detection sensor, 18... Sensor circuit, 19... Motor control section, 21... Conveyance roller ,
25...Thermal head. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] Until the leading edge of the top sheet of recording paper placed in the recording paper cassette passes the separation claw provided on the recording paper cassette.
The recording paper is pressed in the plane direction by the recording paper feeding means, and when the leading edge of the recording paper passes the separating claw, the pressure by the feeding means is temporarily stopped, and then the recording paper is pushed again in the plane direction. A recording paper feeding method for an image recording apparatus, characterized in that the recording paper is fed from the recording paper cassette by pressing in a direction.