JP3797392B2 - Belt conveyor type stacker for continuous paper printer - Google Patents

Description

となり、ベルトコンベア上の一定距離上にのる用紙の頁数を用紙長Ｌに関係なく一定にできる。
【００２１】
【発明の効果】
本発明によれば、印刷される用紙の用紙長に関係なく、ベルトコンベア上の用紙と用紙の間隔を適切な一定距離にすることにより、印刷後の用紙のトナー再溶融の防止および整列性を向上することができ、オペレータへの作業負担を軽減できる。
【図面の簡単な説明】
【図１】プリンタの用紙排出部の模式図である。
【図２】ベルトコンベア式スタッカの概略図である。
【図３】ベルトコンベア式スタッカの制御系のブロック図である。
【図４】（ａ）は用紙長が小さい場合における従来のベルトコンベア式スタッカ上の印刷後の用紙の状態を表した模式図である。（ｂ）は用紙長が大きい場合における従来のベルトコンベア式スタッカ上の印刷後の用紙の状態を表した模式図である。
【符号の説明】
１…感光体、２…帯電器、３…ポリゴンミラー、４…レーザチューブ、５…Ｆθレンズ、６…現像機、７…転写器、８ａ…トラクタ、８ｂ…トラクタ、９…定着器、１０…予熱板、１１…熱ロール、１２…圧力ロール、１３…用紙、１４スイングフィン、１５パドル、１６…用紙長検出センサ、１７…コンベアベルト、１８…タイミングプーリ、１９…シャフト、２０…タイミングベルト、２１…タイミングプーリ、２２…ステッピングモータ、２３…ブロア、２４…ダクト、２５…シャフト、２６…コンベアテーブル、２７…マイクロコンピュータ部、２８…ステッピングモータ制御部、２９…ブロア制御部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor type stacker of a continuous paper printing apparatus.
[0002]
[Prior art]
FIG. 1 is a schematic view of a conventional heat fixing type laser beam printer with a belt conveyor type stacker.
[0003]
When a printing operation start signal is issued to the laser beam printer by a controller that controls the laser beam printer, the photosensitive member 1 starts rotating. The photoreceptor 1 rotates at a speed corresponding to the printing speed of the laser beam printer and continues to rotate until the printing operation is completed.
[0004]
When the photosensitive member 1 starts to rotate, a positive high voltage is applied to the charger 2 to uniformly charge the surface of the photosensitive member 1 with a positive charge.
[0005]
The polygon mirror 3 is a polyhedral reflecting mirror that starts rotating as soon as power is supplied to the printer. As long as the power is turned on, the polygon mirror 3 rotates at a constant speed with high accuracy. The laser beam output from the laser tube 4 is reflected by the polygon mirror 3 and irradiated through the Fθ lens 5 while being scanned on the photosensitive member 1.
[0006]
Character or graphic data converted into a dot image from the controller is issued to the laser beam printer as a laser beam ON / OFF signal, and a portion not irradiated with the laser beam is formed on the surface of the photosensitive member 1. When the laser beam is irradiated, the charge on the photoconductor 1 disappears, and when that portion reaches the front of the developing device 6, the positively charged toner is attracted by static electricity and a toner image is formed on the photoconductor 1.
[0007]
At the timing when the head of the print data formed on the photosensitive member 1 by the laser beam comes before the transfer device 7, the head of the paper 13 on which the data is printed (paper folding perforation) comes before the transfer device 7. Thus, the tractors 8a and 8b are driven.
[0008]
The paper 13 is conveyed from the hopper unit to the fixing unit by the tractors 8 a and 8 b through the developing unit including the photosensitive member 1, the developing device 6, and the transfer unit 7.
[0009]
The paper 13 that has reached the fixing device 9 is preheated by the preheating plate 10 and then conveyed while being pressurized and heated by the heat roll 11 and the pressure roll 12, whereby the toner image is melted and fixed on the paper 13.
[0010]
The printed paper 13 is folded according to the folding perforation by the swinging motion of the swing fin 14 and then stacked on the conveyor belt 17 while being folded by the rotating paddle 15. The conveyor belt 17 is driven during printing and conveys the paper 13.
[0011]
Here, the operation of the belt conveyor type stacker will be described with reference to FIGS. FIG. 2 is a schematic diagram of a belt conveyor type stacker, and FIG. 3 is a block diagram of a control system of the belt conveyor type stacker. The control system of the belt conveyor type stacker includes a microcomputer unit 27 including a CPU, ROM, RAM and the like, a stepping motor control unit 28, a stepping motor 22, a blower control unit 29, and a blower 23. Since each detail is a general control system, description is abbreviate | omitted.
[0012]
When the print data is output from the controller, the paper feeding operation of the printing apparatus is started, and the FEED-P signal is turned ON. When this signal is output, the conveyor belt drive signal BELT DRV-P signal is output from the microcomputer unit 27 to the stepping motor control unit 28. As a result, the stepping motor 22 starts rotating, and the conveyor belt 17 is driven to convey the printed paper 13 at a constant speed. Similarly, when the P FEED-P signal is turned ON, a BLOWER DRV-P signal is output to the blower control unit 29 and the blower 23 starts to rotate, and air is sent from the duct 24 to cool the printed paper 13.
[0013]
[Problems to be solved by the invention]
Conventionally, the speed at which the conveyor belt 17 conveys the paper 13, that is, the rotation speed of the stepping motor 22, is constant regardless of the paper length of the paper to be printed, and the printing speed (paper feeding speed) of the printing apparatus is also constant. Therefore, the interval X between the sheet discharged from the printer and the sheet differs depending on the sheet length L. In short, if the paper length of the paper to be printed is L (inch) and the printing speed (paper feeding speed) of the printing apparatus is V (inch / sec), the number of pages of paper discharged from the printing apparatus per unit time is V / L (page / sec). When the paper length L is small, the number of pages V / L discharged onto the conveyor belt 17 per unit time increases, so that the paper interval X as shown in FIG. Becomes smaller. On the other hand, when the paper length L is large, the number of pages V / L decreases, so that the paper interval X increases as shown in FIG.
[0014]
That is, if the paper interval X is small, the printed paper becomes dense, so that the air blown from the blower 23 is not blown through, and the paper is not sufficiently cooled. The toner printed on the paper 13 is melted again and sticks to the previous paper. End up. In addition, if the paper interval X is large, the paper after printing becomes sparse, so that the paper 13 is easily blown by the blower 23 and the alignment of the paper 13 is poor and the operator has to realign.
[0015]
An object of the present invention is to prevent the toner from being melted again after printing, and to reduce the work load for the operator to rearrange the sheets.
[0016]
[Means for Solving the Problems]
The above object is achieved by providing means for switching the conveying speed of the belt conveyor provided in the paper discharge unit of the continuous paper printing apparatus based on the length between the folds of the continuous paper.
[0017]
By switching the conveying speed of the conveyor belt, that is, the rotation speed of the stepping motor 22 for each paper length of the paper to be printed, the number of paper pages on the belt conveyor becomes constant, so that the interval between the papers after the printing is finished is changed. Regardless of the paper length, it always becomes an appropriate constant value, so that it is possible to prevent re-melting of toner on the paper after printing and to reduce the work load for the operator to rearrange the paper.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Since the configuration of the embodiment showing the present invention is not particularly different from the conventional configuration, the description thereof is omitted. A control method according to the present invention will be described below. According to the paper length information from the paper length detection sensor 16, the number of rotations of the stepping motor 22 that drives the conveyor belt 17 is set to a predetermined value. As described above, the sheet discharged from the printing apparatus per unit time is V / L (page / sec).
[0019]
Here, there is no generation of a toner stick when the paper length is (Lmin + Lmax) / 2 (inch) when the range of the paper length L that can be printed by this printing apparatus is Lmin to Lmax (inch), and Assuming that the appropriate conveying speed of the conveyor belt 4 with good sheet alignment is S, the conveying speed of the conveyor belt 4 when the sheet length L = Lx is S · ((Lmin + Lmax) / 2) / Lx
It becomes.
[0020]
On the other hand, since the paper discharged from the printing apparatus is V / Lx (page / sec), the number of pages of paper on a certain distance on the belt conveyor is

Thus, the number of pages of paper on a certain distance on the belt conveyor can be made constant regardless of the paper length L.
[0021]
【The invention's effect】
According to the present invention, it is possible to prevent the toner from being remelted and to align the paper after printing by setting the distance between the paper on the belt conveyor to an appropriate constant distance regardless of the paper length of the paper to be printed. It is possible to improve the work load on the operator.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a paper discharge unit of a printer.
FIG. 2 is a schematic view of a belt conveyor type stacker.
FIG. 3 is a block diagram of a control system of the belt conveyor type stacker.
FIG. 4A is a schematic diagram showing a state of paper after printing on a conventional belt conveyor type stacker when the paper length is small. (B) is a schematic diagram showing the state of paper after printing on a conventional belt conveyor type stacker when the paper length is large.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Photoconductor, 2 ... Charger, 3 ... Polygon mirror, 4 ... Laser tube, 5 ... F (theta) lens, 6 ... Developing machine, 7 ... Transfer device, 8a ... Tractor, 8b ... Tractor, 9 ... Fixing device, 10 ... Preheating plate, 11 ... heat roll, 12 ... pressure roll, 13 ... paper, 14 swing fin, 15 paddle, 16 ... paper length detection sensor, 17 ... conveyor belt, 18 ... timing pulley, 19 ... shaft, 20 ... timing belt, DESCRIPTION OF SYMBOLS 21 ... Timing pulley, 22 ... Stepping motor, 23 ... Blower, 24 ... Duct, 25 ... Shaft, 26 ... Conveyor table, 27 ... Microcomputer part, 28 ... Stepping motor control part, 29 ... Blower control part

Claims (1)

A belt conveyor type stacker of a continuous paper printing apparatus, comprising means for switching a conveyance speed of a belt conveyor provided in a paper discharge unit of the continuous paper printing apparatus based on a length between folds of the continuous paper.

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