JPH0717036A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To provide an ink jet recording apparatus holding a recording material to a non-slackened state at the time of ink jet recording to impart a good printing grade. CONSTITUTION:A paper feed roller 8 is provided to the feed part feeding paper S being a recording material and a delivery roller 9 is provided to a delivery part delivering the paper S after recording and, in order to hold the paper S to a non-slackened state at the time of ink jet recording, the delivery roller 10 is rotated in a delivery direction and the paper feed roller 8 is reversely rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for recording by ejecting ink from a recording means onto a recording material.

[0002]

2. Description of the Related Art Paper feed roller 108 and pinch roller 10
The paper S ′ is held and moved by 5 and a guide member (platen) is installed on the back surface of the paper S ′. When the paper S ′ is discharged by the paper discharge roller 110 and the spur 113, the paper S is discharged to the ink head or the like. The paper S'was lightly held so that it would not come into contact with the paper ', and the discharge operation was performed. Further, the registration of the leading edge of the paper S'has been performed by abutting the paper S'on the reversely rotated paper feed roller 108.

[0003]

However, in the above-mentioned conventional ink jet recording apparatus, it is difficult to perform registration at the time of feeding the leading edge of the paper S ', and the registration is performed with the aid of an automatic paper feeding apparatus or the like separate from the main body. Had to do.

Since the paper S'is pushed toward the discharge side by the paper feeding device, if the paper is caught in the paper discharging device or hits against the paper due to an obstacle in the paper discharging, the paper in the recording portion comes into contact with the slack ink head. Or a proper gap between sheets could not be obtained, resulting in deterioration of print quality.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to maintain a recording material in a slack-free state during ink jet recording.
An object of the present invention is to provide an inkjet recording device with good printing quality.

[0006]

In order to achieve the above object, in the present invention, an ink jet recording apparatus comprising a feeding section for feeding a recording material and an ejecting section for discharging after recording, A feature of the present invention is that the recording material is held in a slack-free state during inkjet recording.

It is preferable that the slack-free state be achieved by the reverse rotation of the respective rollers in the feeding section and the discharging section.

Further, the slack-free state may be constituted by providing a difference in speed between the rollers in the feeding section and the discharging section.

On the other hand, it is preferable that the rotation directions of the rollers in the feeding portion and the discharging portion are reversed between the feeding of the recording material and the ink jet recording.

[0010]

According to the ink jet recording apparatus constructed as described above, since the recording material is held in a state without slack during ink jet recording, the distance between the ink head and the recording material becomes constant and stabilized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

[First Embodiment] FIG. 1 is a perspective view of an ink jet recording apparatus according to a first embodiment of the present invention.

In the figure, 1 is an ink head mounted on 2 carriers, and is line fed by 4 carrier guides and 3 lead screws. 6 is a paper feed motor 7
The paper discharge roller 10 in the discharge portion by the gear 7b and the paper feed roller 8 in the feeding portion by the pulley 7a are arranged so that their rotation directions are opposite to each other via the drive shaft. Now when each roller is rotating in the direction of arrow A,
When the paper S as the recording material is inserted, the paper S is pinched by the pinch roller 5 and the paper feed roller 8 so that the starting end of the paper S is discharged by the paper discharge roller
Delivered to 0. The paper discharge roller 10 is the paper feed roller 8
Since it rotates in the opposite direction, registration is performed because the entire leading end of the paper S is abutted against the paper discharge roller 10 even if there is skew or the like. After that, when the paper feed motor 6 is rotated in the reverse direction, the paper S is fed by the spur 13 and the paper discharge roller 10, and the paper feed roller 8 is rotated in the reverse direction, but the slip of the belt 12 and the pressure contact with the pinch roller 5 are applied to the drive shaft 7. As the fulcrum, the spring of 9 performs the arm of 11 at the clearance angle, so that the paper S is rotated so as to give tension to the paper S with a weaker rotational torque than the paper discharge roller 10. Since the paper S is fed without sagging, the distance between the ink head 1 and the paper S becomes constant and stabilized, and the printing accuracy is improved.

[Second Embodiment] FIG. 2 is a side view showing a second embodiment of the present invention. In FIG. 2, 10 is rotated from the discharged sheet from the drive shaft 7 through the speed increasing gear 11b.
Further, the paper feed roller 8 rotates in the same direction as the paper discharge roller 10 at a slower speed than the paper discharge roller 10 via the reduction gear 11a. 9a and 9b are pressure contact springs, and 9b is made weaker than 9a. By making the paper feed roller 8 act as a tension roller, paper tension is applied between the pinch roller 5, the paper feed roller 8 and the paper discharge roller 10, and the spur 13. Printing accuracy is improved without sagging.

[Third Embodiment] In FIG. 1, instead of the belt 12 shown in FIG. 1, an idler or the like is arranged so as to rotate while sliding, or a one-way clutch is inserted between the pulley 7a and the gear 7b, and the paper S It is possible to obtain the same effect as that of the first embodiment by rotating with a strong force at the time of feeding the leading edge and with a weak force when the paper feed roller 8 acts as a tension roller.

[0016]

EFFECT OF THE INVENTION The present invention has the above-described structure and operation. Since the recording material is held in a state without sagging during ink jet recording, the distance between the ink head and the recording material becomes constant and stabilized, The print quality is improved because the recording material does not come into contact with the head.

Further, when the recording material is fed, the roller of the feeding portion and the roller of the discharging portion rotate in reverse, so that even if the recording material to be fed is skewed, the recording material is fed at the discharging portion roller position. Since the starting end is adjusted, stable inkjet recording becomes possible.

[Brief description of drawings]

FIG. 1 is a schematic view of an inkjet recording apparatus that is a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an ink jet recording apparatus that is a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a conventional inkjet recording apparatus.

[Explanation of symbols]

 S, S 'Paper (recording material) 1 Ink head 5,105 Pinch roller 8,101 Paper feed roller 10,110 Paper discharge roller 11a Reduction gear 11b Acceleration gear 13,113 Spur

Claims (4)

[Claims] 1. An inkjet recording apparatus comprising a feeding section for feeding a recording material and a discharging section for discharging after recording, wherein the recording material is held in a slack-free state during inkjet recording. Inkjet recording device. 2. The ink jet recording apparatus according to claim 1, wherein the slack-free state is obtained by reversely rotating respective rollers in the feeding unit and the discharging unit. 3. The ink jet recording apparatus according to claim 1, wherein the slack-free state has a difference in speed of each roller in the feeding unit and the discharging unit. 4. The ink jet recording apparatus according to claim 2, wherein the rotational directions of the rollers in the feeding portion and the discharging portion are reversed between the feeding of the recording material and the ink jet recording. .