JPH0512149U - Paper feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a paper feeding device capable of reliably carrying continuous form paper having a folded portion. [Structure] A pair of tractors 3 and 4 that directly contact the continuous paper P and a pair of paper feed rollers 5 and 6 are provided on both sides of the drum 1. Interlocking shaft 1 along the longitudinal direction of the continuous paper P
5, the belts 11 and 12 are stretched over the interlocking shaft 15, and the belts 11 and 12 are coupled to the movable tractor 3 and the movable paper feed roller 5. By adjusting the width of the tractor 3 or the paper feed roller 5, the other side is interlocked to adjust the width of the paper P.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper feeding device that supplies recording paper to a printing unit in a laser printer or the like, and more particularly to a paper feeding device that supplies continuous form paper.

[0002]

[Prior Art]

 When the folded continuous paper is supplied to the transfer drum, which is the printing unit, paper feeding means is provided in front of and behind the drum, and the continuous paper is fed out by both paper feeding means.

FIG. 3 shows a conventional example of a paper feeding device having such a structure. In the figure, reference numeral 31 is a drum which serves as an access portion for printing on the paper P, and a pair of left and right tractors 32 serving as first paper feeding means are provided on the upstream side of the drum 31, and the downstream side thereof. Is provided with a conveyor belt 33 that serves as a means for feeding the second paper. Each of the tractors 32 has hook claws (not shown) formed on a pair of front and rear rotating bodies, and the hook claws engage with a paper feed hole formed at the end of the paper P to apply a conveying force to the paper. Give. On the other hand, the conveyor belt 33 is positioned so as to contact the lower side of the paper, and adsorbs the paper P by vacuum suction or electrostatic adsorption to give a conveying force. The conveyor belt 33 is driven at a somewhat faster speed with respect to the tractor 32, whereby the paper P is continuously conveyed in a tension state.

[0004]

[Problems to be solved by the device]

 As described above, in the conventional paper feeding device that feeds continuous paper, the folded portion Pa is lifted from the conveyor belt 33 due to the crease of the paper P. For this reason, it is impossible to completely adsorb the sheet, which makes the sheet conveyance unstable and also affects the transfer of the image on the drum portion. Further, the conveyor belt 33 requires a constant length and a constant width (contact area) to obtain a desired suction force, which is an obstacle to downsizing of the apparatus.

However, in order to solve this problem, it is conceivable to provide a carrying roller instead of the carrying belt 33. However, it is necessary to sandwich the sheet between the rollers that apply the sheet conveying force and the rollers that prevent the sheet from slipping. On the other hand, in order to have a structure that can accommodate a plurality of types of paper sizes, it is necessary to install the transport roller near the center of the transport path. In such a case, one roller comes into contact with the printing surface side of the paper, which causes a problem that the printing surface of the paper is soiled.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a paper feeding device that enables stable conveyance of continuous paper and is compatible with various paper sizes. That is the purpose.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a first paper feeding means and a second paper feeding means, which are arranged on the upstream side and the downstream side, respectively, with an access portion to the paper sandwiched therebetween. In the paper feeding device that feeds paper in a tensioned state, the first paper feeding means and the second paper feeding means each come into direct contact with the paper from the front and back sides, and have drive ends configured to be movable in the width direction of the paper. It is characterized in that both drive ends are connected to an interlocking means for interlocking them and moving them in the width direction of the paper.

In this case, it is preferable that the second paper feeding means is a paper feeding roller, and the drive end of the second paper feeding means is a feed roller and a pressure roller that constitute the paper feeding roller.

[0009]

[Action]

 In the above configuration, the driving ends of the first and second paper feeding members are moved and adjusted according to the width of the paper, and the paper comes into direct contact with the front and back sides, so that a stable conveying force can be applied to the paper. Further, since the drive end is connected to the interlocking device, and the drive end of the other paper feed member is interlocked with the movement of the drive end of the one paper feed member, it is easy to adjust the size according to the paper width. be able to.

In this case, the second paper feeding unit can be configured compact by using the paper feeding roller as the second paper feeding unit.

[0011]

【Example】

 Hereinafter, a paper feeding device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. This paper feeding device conveys continuous paper as the paper P, and a pair of first paper feeding means are provided in the conveyance path 2 before and after the drum 1 which is an access portion for performing printing on the paper P. Tractors 3 and 4 (driving source is not shown), and a pair of paper feeding rollers 5 and 6 (driving source is not shown) to be second paper feeding means. In this case, the tractors 3 and 4 are located on the upstream side in the conveyance direction of the paper P, and the feed rollers 5 and 6 are located on the downstream side. Further, in each case, the tractor 3 and the paper feed roller 5 on one side (the right side in the conveyance direction in the figure) are movable so as to be movable in the width direction of the paper P, and the tractor 4 and the paper feed roller 6 on the other side are the paper P. It is a fixed side that does not move in the width direction.

The tractors 3 and 4 and the paper feed rollers 5 and 6 directly contact both sides of the paper P, that is, the print inhibition area Pa, and apply a conveying force to the paper. Therefore, the tractors 3 and 4 come into contact with the hook claws (not shown) that engage from below with the paper feed holes Pb formed at both ends of the paper 1 in the width direction, and prevent the paper from floating. The pressing pieces 7 and 7 form a driving end. On the other hand, the paper feed rollers 5 and 6 have feed rollers 8 and 8 and pressure rollers 9 and 9 that make contact with the paper 1 from above and below (front and back) to form drive ends. That is, each paper feed roller 5 (6) is composed of a lower feed roller 8 that applies a conveying force to the paper and an upper pressure roller 9 that presses the paper P toward the feed roller 8 side. The paper P is conveyed by sandwiching the paper P between the rollers 8 and 9. The pressure roller 9 is rotatably supported by the arm 10, and is biased toward the feed roller 8 by a spring (not shown) incorporated in the arm 10. In this case, the speeds of the paper feed rollers 5 and 6 are adjusted so as to be slightly overfeed by the tractors 3 and 4, and the paper is fed in a tension state while slipping somewhat.

Further, the movable tractor 3 and the paper feed roller 5 are fixed to the belts 11 and 12 passed in a direction orthogonal to the conveyance of the paper P by screws or the like. These belts 11 and 12 are hooked on pulleys 14 and 14 whose one end is fixed to the support shafts 13 and 13 while sandwiching the conveyance path 2, and the other end is a pulley 16 which is fixed to both outer ends of the interlocking shaft 15. , 16 are hung. Both support shafts 13 and 13 extend parallel to the conveyance direction of the paper P, and both ends thereof are rotatably supported by bearings 17. Similarly, the driving shaft 15 extends parallel to the conveyance direction of the paper P and is rotatably supported by the bearing 18.

As shown in FIG. 2, the interlocking shaft 15 is inclined so as to intersect the longitudinal direction of the paper P, and is rotated in the same direction by one belt 11 or 12 rotations, and the rotation thereof is performed in the other belt. Transfer to 12 or 11. As a result, when either one of the tractor 3 and the feed roller 5 is moved in the width direction of the paper P according to the width of the paper P, the interlocking device is configured to move the other side in the same direction as this movement by the same amount. Has been done.

In the above configuration, since the tractors 3 and 4 and the feed rollers 5 and 6 directly contact the widthwise ends of the paper P from above and below to apply the conveying force, the bent portion and the curl of the paper P are prevented. Even if there is, it is possible to reliably apply the conveying force while maintaining the pulled state. Therefore, the paper P can be stably transported, and the image transfer by the drum 1 can be stably performed. Further, by using the feed rollers 5 and 6, it is not necessary to consider the contact area with the paper, so that the apparatus can be downsized as a whole. Further, the contamination of the printing surface of the paper P, which is a problem due to the adoption of the feed rollers 5 and 6, is configured so that the feed roller can be moved in the width direction of 5 sheets, and the feed rollers 5 and 6 are always set to the print prohibited area Pa of the sheet. It has been resolved by contacting with. Moreover, in this case, that is, when the width of the paper P changes according to the paper size, the movable tractor 3 or the feed roller 5 is moved in accordance with the paper width, so that the other is interlocked. , Easy adjustment according to the paper width.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, both the first and second paper feeding means may be feed rollers, and the interlocking means other than the interlocking shaft. The parallel link mechanism may be used.

[0017]

[Effect of the device]

 According to the present invention, since the driving ends of the first and second paper feeding members are brought into contact with the paper directly from the front and back, the paper can be carried stably and the printing quality can be stabilized, and at the same time, the paper can be carried out. This has the effect that the drive end can be easily adjusted according to the width.

[Brief description of drawings]

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

FIG. 2 is a side view of a paper feeding device according to an embodiment of the present invention.

FIG. 3 is a side view of a conventional paper feeding device.

[Explanation of symbols]

 1 ... Drum 3, 4 ... Tractor 5, 6 ... Paper feed roller 7 ... Pressing piece 8 ... Feed roller 9 ... Pressure roller 11, 12 ... Belt 15 ... Interlocking shaft P ... Paper

Claims (2)

[Scope of utility model registration request] 1. A first paper feeding means and a second paper feeding means are respectively arranged on the upstream side and the downstream side with an access portion to the paper sandwiched therebetween, and the paper feeding means feeds the paper in a tensioned state. In the apparatus, the first paper feeding means and the second paper feeding means each have a driving end configured to be in direct contact with the paper from the front and back sides and to be movable in the width direction of the paper. A paper feeding device characterized in that the ends are connected to interlocking means for moving them in the width direction of the paper. 2. The second paper feeding means is a paper feeding roller, and the drive end of the second paper feeding means is a feed roller and a pressure roller which constitute the paper feeding roller. The paper feeding device according to claim 1.