JP2000128427A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with inferiority of a record material in return delivery by providing a control means for stopping a record material guide surface for a swing fin, which inversely drives a delivery means and applies a folding force to the record material in prior to the return delivery of the record material, at a position perpendicular to the record material stacking surface in a storage means. SOLUTION: When a print signal from a host device is stopped, a print stop signal is generated, and when an electrostatic latent image reaches a transfer point B after T second, the print operation is completed and a swing fin 12 stops the operation, holding an angle θ. Then, the angle θ expressed by the inclination direction of the swing fin 12 and the number of the operation step of the swing fin motor is stored. After that, the swing fin 12 is driven with its guide surface becoming perpendicular to the paper face of a stacker 14 inside and stops at the home position. The excitation of the swing fin motor is turned off to release the fixing of the swing fin 12. Meantime, a tractor 6 is stopped in an operation for feeding perforation A to a pressurizing point. Then, the tractor 6 is stopped in the operation of sending the stitches A to a pressurization point. After that, the tractor 6 is operated inversely to carry the paper sheet inversely in printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for printing on a continuous recording material such as continuous paper.

[0002]

2. Description of the Related Art A swinging fin capable of pendulum operation is provided in a paper discharge section of a printing apparatus, and a recording material sent from a printing means side is alternately folded front and back at predetermined intervals, and the recording material is stored in a storage means such as a stacker. For example, Japanese Patent Application Laid-Open Nos. 8-2806 and 8-17
This is known from Japanese Patent No. 5747 and Japanese Patent Application Laid-Open No. 8-192950.

A schematic configuration of a continuous paper printing apparatus using an electrophotographic method will be described with reference to FIG.

When a print signal decomposed into dot data is transmitted from a host device (not shown), a laser beam scans the surface of the photosensitive drum 1. The surface of the photosensitive drum 1 is uniformly charged by the charger 2, and the charge of the portion irradiated with the laser beam escapes, so that an electrostatic latent image is formed on the surface of the photosensitive drum 1. The electrostatic latent image is developed by the developing device 3 and carried to a position facing the transfer device 4. The recording material 5 (here, paper is used) sent by the tractor 6 is
It travels at a constant speed in front of the transfer unit 4 while being tensioned by a puller 13 rotating in a direction opposite to the transport direction, and is pressed against the surface of the photosensitive drum 1 by a retractor 7.

The toner image on the surface of the photosensitive drum 1 carried before the transfer unit 4 is transferred to a sheet 5 by the transfer unit 4. The sheet 5 onto which the toner image has been transferred passes through the buffer 8 and then passes between the heat roller 9 and the backup roller 10 to be fixed by heat and pressure. The fixed paper 5 is sequentially sent to the stacker 14 by the discharge roller 11. The printed sheets 5 are folded by the pendulum operation of the swing fins 12 according to folding perforations provided at predetermined intervals in advance, and then stacked in the stacker 14 while being folded by the rotating paddles 16. Can be

A conventional structure of the swing fin 12 will be described with reference to FIG. A stepping motor is used for the swing fin motor 20, and the swing fin motor 2
The rotation of 0 is reduced by the gear head 21. The rotation of the motor is transmitted to a pulley 23 fixed to a swing fin shaft 24 by a timing belt 22. The swing fin 12 is fixed to the swing fin shaft 24. That is, the swing fin motor 20 is turned clockwise (CW) in order to make the swing fin 12 perform a pendulum operation.
/ Switch the direction of rotation in the counterclockwise direction (CCW) and rotate. The swing angle of the swing fin 12 can be freely selected by managing the number of operation steps of the swing fin motor 20.

[0007] An encoder plate 26 is fixed to the swing fin shaft 24, and the position of the swing fin 12 is detected based on the positional relationship with the photo interrupter 25.

FIG. 5 shows the operation of the swing fin 12 during printing.
Shown in FIG. 5 shows a state in which the swing fin 12 is driven in the CW direction during printing. The swing fin 12 driven in the CW direction stops once when the mountain perforation comes out from the tip of the swing fin by the length L.
The driving direction is switched to the CCW direction. This driving direction switching operation is called a turn. As the length L, a value that gives the best foldability is selected.

[0009] The swing fin 12 is CC
Driven in the W direction, the next valley perforation is the swing fin 1
2 Approach the tip.

As described below, the valley perforation reaches a length L from the tip of the swing fin 12, and at this time, the swing fin 12 turns in the CW direction.

[0011] Thereafter, the same operation is repeated, and a swing fin pendulum operation is performed in accordance with the turn. The swing angle of the swing fins 12 from turn to turn is determined to an angle at which printing paper length data is acquired by the paper length detecting means and stable folding can be performed.

FIG. 6 shows a timing chart of the operation at the end of printing. In FIG. 6, (1) indicates that the signal is valid, and (0) indicates that there is no signal. Regarding the tractor motor rotation direction, the paper transport direction during printing is the forward direction, and the transport direction opposite to that during printing is the reverse direction. The print signal from the host device stops,
A print stop signal is generated (A).

At this time, the electrostatic latent image formed on the rotating photosensitive drum 1 shown in FIG. 7 reaches the transfer point after T seconds,
The image is transferred to the sheet 5 (B). At B, the printing operation ends, and the swing fin 12 stops operating immediately. The stop angle θ is arbitrarily changed depending on the length of paper used, the length of data actually printed, and the like. At this time, the relationship between the position of the sheet perforation and the inclination direction and angle θ of the swing fin 12 is preserved, and the operation must be restarted from the state B when the next printing is restarted. For this reason, the swing fin 12 is fixed while the excitation of the swing fin motor 20 is kept ON, and the angle θ is maintained.

Thereafter, the heat roller 9 and the backup roller 10 in the pressed state are separated from each other. In this case, in order to take measures against the occurrence of a missing character, the tractor 6 is moved until the perforation A in front of the heat roller reaches the pressing point. Operate, decelerate,
After the stop, the heat roller 9 and the backup roller 10 are separated.

When the backup roller 10 is separated from the heat roller 9, the tractor 6 is then operated in the direction opposite to the printing direction, and the paper is conveyed (returned and conveyed) in the direction opposite to the printing. Is returned to the position at B.

[0016]

By the way, in the above-mentioned conventional structure, the return transport operation is performed by the swing fin 1.
2 was stopped at the angle at the end of printing, and when the stop angle θ of the swing fin was large, the paper was liable to be caught on the paddle 16 and the like, causing problems such as center folding and paper jam. Had a configuration that was easy to invite.

An object of the present invention is to provide a printing apparatus capable of eliminating a recording material conveyance failure during return conveyance.

[0018]

SUMMARY OF THE INVENTION It is an object of the present invention to convey a long and continuous recording material connected to a drive source capable of switching between forward and reverse rotation, and a printing means for printing on the recording material. Storage means for folding the recording material sent out from the printing means side by side at predetermined intervals alternately and loading and storing the recording material; and a pendulum operation provided in a stage preceding the storage means, the pendulum operation being provided. And a swing fin for applying a folding force to the recording material sent out from the printing means side, thereby driving the transport means in the reverse direction, and prior to returning and transporting the recording material, the swing fin This is achieved by providing control means for stopping the recording material guide surface at a position substantially perpendicular to the recording material loading surface in the storage means.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 7. FIG. In FIG. 1, (1)
Indicates that the signal is valid, and (0) indicates that there is no signal. The description of the swing fin device is the same as that of the prior art, and thus will be omitted.

When the print signal from the host device (not shown) is stopped, a print stop signal is generated as in the prior art (A).
When the electrostatic latent image at this time reaches the transfer point after T seconds, the printing operation ends, and the swing fin 12 stops the operation while maintaining the angle θ shown in FIG. 2B (B). At this time, the inclination direction of the swing fin 12 and the swing fin motor 2
The angle θ represented by the number of operation steps of 0 is stored. Thereafter, as shown in FIG. 2C, the swing fin 12 is driven so that its guide surface 12a is perpendicular to the sheet surface in the stacker 14, and stops. This position is called a home position. Further, the excitation of the swing fin motor 20 is turned off at the home position, and the swing fin 1 is turned off.
2 is released (C). During this time, the operation of feeding perforation A in FIG. 7 to the pressure point is also performed, and when the perforation A reaches the pressure point, the tractor 6 stops (D).

When both the end of the movement of the swing fin 12 at the home position at C and the stop of the tractor 6 at D are confirmed, the heat roller 9 and the backup roller 10 are separated from each other (D → E). 6 is operated in the reverse direction to convey the paper in the direction opposite to that during printing (E → F).

After the tractor 6 stops, the excitation of the swing fin motor 20 is turned ON, the swing fin 12 is operated again, and the swing fin 12 is stopped at a position where the inclination direction and the angle of the swing fin 12 become the same as the stored state again. (G).

[0023]

As described above, according to the printing apparatus of the present invention, before returning and transporting the recording material, the recording material guide surface of the swing fin is substantially perpendicular to the recording material loading surface in the storage means. Since the recording material is stopped at the position, the recording material is returned upward in a straight posture at the time of the return conveyance, so that the conveyance failure of the recording material can be eliminated.

[Brief description of the drawings]

FIG. 1 is a time chart of a printing apparatus according to the present invention.

FIG. 2 is an explanatory view of the operation of the swing fin of the present invention.

FIG. 3 is a schematic configuration diagram of a continuous paper printing apparatus.

FIG. 4 is a perspective view showing a schematic configuration of a swing fin device.

FIG. 5 is a diagram illustrating the operation of a swing fin.

FIG. 6 is a time chart of a printing apparatus according to the related art.

FIG. 7 is a schematic configuration diagram illustrating return conveyance of the continuous paper printing apparatus.

[Explanation of symbols]

5 paper (recording material), 6 tractor (transporting means), 12
... Swing fins, 14 ... Stackers (storage means).

Claims (2)

[Claims] 1. A drive source connected to a forward / reverse switchable drive source,
Conveyance means for conveying a long continuous recording material, printing means for printing on the recording material, and a recording material sent out from the printing means side alternately folded at predetermined intervals, and the recording material And a swing fin which is provided in a stage preceding the housing so as to be capable of pendulum operation, and which imparts a folding force to a recording material sent out from the printing means side by the pendulum operation. In the apparatus, a control is performed in which the conveying unit is driven to rotate in a reverse direction, and before the recording material is returned and conveyed, the recording material guide surface of the swing fin is stopped at a position substantially perpendicular to the recording material loading surface in the storage unit. A printing device comprising: means for printing. 2. The printing apparatus according to claim 1, wherein after the return conveyance is completed, the position of the swing fin is returned to an original stop position before the start of the return conveyance.