JP2552464Y2 - Printer output tray - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper receiving tray for receiving printed printing paper in a printing device such as a stencil printing device.

[0002]

2. Description of the Related Art In the process of stacking printed printing paper on a mounting table that is substantially horizontal or slightly inclined, when the front edge of the printing paper hangs down due to its own weight and advances on a paper discharge table,
The leading edge portion of the printing paper already laid on the paper output tray rubs against the upper surface of the printing paper, that is, the printed image surface, and this causes the printed image of the already discharged printing paper to be stained. Become.

In order to solve the above-mentioned problem, the discharged printing paper is curved in a substantially U-shaped arc when viewed in a cross section perpendicular to the discharging direction in the discharging process. Increasing the apparent rigidity of the printing paper along the discharge direction,
In this way, it is desirable that the printing paper is allowed to fall onto the paper discharge table while keeping a substantially horizontal posture without sagging during the paper discharging process. In a conventional paper discharging device, it is desirable to discharge the paper as shown in FIG. The above-described problem has been solved by providing a paper sliding surface or a guide having an upward slope as viewed in the paper discharging direction on the inner surface of a side plate erected on the paper table bottom plate.

[0004]

SUMMARY OF THE INVENTION In the above-described printing apparatus,
The above-described object can be achieved by discharging printing paper having a printing area close to a non-printing state. However, in a printing state having a large printing area, the printing paper in the discharging process as shown in FIGS. After reaching the wall board, the U-shaped curve disappears or curves in the opposite direction due to the physical properties of the printing paper during the process of dropping onto the paper discharge table, causing poor paper discharge alignment. In particular, when discharging printing paper in a printing state having an extremely large printing area, such as solid printing, after passing through an upwardly sloping paper sliding surface provided on an inner side surface of a side plate erected on a discharge base plate. , The leading edge of the printing paper hangs down before it reaches the front wall, causing not only misalignment but also printing in which the leading edge of the printing paper is already placed on the paper output tray. The printed image will advance by rubbing against the upper surface of the sheet, that is, the printed image surface, which will stain the printed image of the already discharged printing sheet.

[0005] The present invention solves the above-described problems, regardless of the type of printing paper and the size of the printing area of the printing paper, regardless of the printing state, resulting in defective paper discharge and contamination of the printed image. It is an object of the present invention to provide a delivery tray configured to receive printing paper without the need.

[0006]

According to the present invention, there is provided a paper ejection tray for a printing apparatus in which a pair of side plates for regulating the position of ejected printing paper are provided on a bottom plate. In the front inner side surface of the side plate into which the printing paper is introduced, a guide surface of the printing paper that is inclined upward in the sheet discharging direction is provided, and further, the upper side of the inner side surface of the side plate is lower than the lower side. Also, a guide surface of the printing paper projecting inward is provided.

[0007]

According to the above construction, when printed printing paper reaches the discharge tray, the printed paper is guided by the upwardly inclined guide surface on the upper front surface of the side plate erected on the bottom plate of the discharge tray. The front side edges are lifted upward, and the printing paper is given a U-shaped curve when viewed in a cross section perpendicular to the paper discharging direction. Since the distance in the width direction of the passing portion of the subsequent printing paper is regulated to be shorter than the width of the printing paper by the inwardly protruding portion on the upper side of the side plate, the front edge portion of the printing paper has a front wall plate. The U-shape is maintained until the pressure reaches. The U-shape will be held halfway while falling on the paper output table,
For these reasons, it is possible to prevent the leading edge and both edges of the printing paper from sagging downward, so that even if the printing paper has an extremely large printing area, the paper can be regularly discharged, and the discharge paper alignment failure and the print image Will not be stained.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention; FIGS. 4 to 6 show one embodiment of a printing apparatus having a paper output tray according to the present invention. In the figure, reference numeral 10 denotes a cylindrical plate cylinder. The cylindrical plate cylinder 10 has a porous structure that allows the passage of printing ink. A driving device (not shown) rotates around the central axis in a counterclockwise direction as viewed in FIG.

Below the cylindrical plate cylinder 10, a press roller 1 is provided.
4 are provided. The press roller 14 has a support shaft 16.
Supported rotatably about its own central axis by
Printing is selectively pressed against the outer peripheral surface of the cylindrical plate cylinder 10 in synchronization with the rotation of the cylindrical plate cylinder 10 by an urging device (not shown), and fed to the cylindrical plate cylinder 10. The sheet P is pressed against the outer peripheral surface of the cylindrical plate cylinder 10.

A separation claw 18 is provided on the discharge side of the cylindrical plate cylinder 10. The separation claw 18 is supported by a support shaft 20 and comes very close to the outer peripheral surface of the cylindrical plate cylinder 10 at a sharp tip portion. The leading edge of the attached printing paper P is hooked and peeled off from the cylindrical plate cylinder as the cylindrical plate cylinder 10 rotates.

On the paper discharge side of the cylindrical plate cylinder 10, a paper discharge transport device 30 is provided. The sheet discharging and conveying device 30 has a sheet discharging and conveying surface 32 extending substantially horizontally from the vicinity of the press roller 14 to the direction away from the press roller 14, that is, in the sheet discharging direction.

Pulley shafts 34 and 36 are provided at the start end and the end of the paper discharge transport surface 32, respectively, extending in a direction perpendicular to the paper discharge direction. Three pulleys 38 and 40 are respectively mounted on the pulley shafts 34 and 36 so as to be spaced apart from each other in the axial direction. A belt-shaped endless belt 42 is wound around the three pulleys 38 and 40 in a state where a predetermined tension is applied. The endless belt 42 is made of a material having a relatively high coefficient of friction, such as rubber or a rubber-like product, and has an upper span extending through a tunnel portion 44 below the sheet discharge conveyance surface 32. The pulley shaft 34 or 36 is drivingly connected to an electric motor (not shown),
, The endless belt 42 is caused to run at a speed higher than the peripheral speed of the cylindrical plate cylinder 10.

A first raised member 46 having a triangular pyramid shape is provided on both sides near the end of the paper discharge transport surface 32. Further, on both sides of the terminal end portion of the paper discharge transport surface 32, second protruding members 48 each having a triangular pyramid shape are provided. First raised member 4
The sixth and second raised members 48 each have paper sliding surfaces 46a and 48a that are three-dimensionally inclined upward in the sheet discharging direction and three-dimensionally inclined in a direction in which the interval between the pair of raised members 46 or 48 is reduced. The sheet delivery table 60 to be described later is placed on the sheet delivery conveyance surface 32.
The print paper flying toward the front is given a U-shaped curve when viewed from the front, so that the apparent rigidity is increased along the discharge direction of the print paper. If a more detailed explanation of this is necessary, please refer to Japanese Patent Application Laid-Open No. Sho 60-148866.

Air suction ports 50 and 52 are provided in the vicinity of the starting end and the end of the sheet discharging and conveying surface 42, respectively. The air suction ports 50 and 52 are each provided with an endless belt 42 adjacent to each other.
And acts as an air suction port of the electric blower 54 to generate a negative pressure in the peripheral portion. The air suction port 50 sucks the printing paper P peeled off from the cylindrical plate cylinder 10 by the separation claws 18 to assist in peeling the printing paper P from the cylindrical plate cylinder 10. The air suction port 52 reinforces the bending action in the width direction of the printing paper P reaching the pair of first raised members 46.

The paper discharge table 60 is provided on the paper discharge side of the paper discharge conveyance surface 32. One guide extending along the paper discharge direction is provided at the center in the width direction of the bottom plate 62 extending substantially horizontally. Groove 64
Is provided. A front wall 66 is slidably engaged with the guide groove 64 in the longitudinal direction of the guide groove 64. Bottom plate 6
The two guide grooves 68 are provided at substantially the center in the sheet discharge direction and extend in the width direction in pairs. Each side plate 70 is slidably engaged with the guide groove 68 in the longitudinal direction of the guide groove 68, that is, in the width direction of the bottom plate 62. Each of the side plates 70 is erected from the bottom plate 62 so as to regulate the mounting position in the width direction of the printed printing paper discharged on the bottom plate 62.

The upper side of the inner surface of the side plate 70 on the side of the paper discharge conveyance surface 32, that is, the side where the paper is introduced, is inclined upwardly and is inclined so that the amount of protrusion increases inward toward the paper discharge direction. The paper sliding surface 70a is used as the guide surface. Further, a side plate 7 continuous with the paper sliding surface 70a is provided.
The upper portion of the inner surface of the side plate 70 projects inward from the lower portion of the inner surface of the side plate 70, and a step surface 7 as a guide surface for printing paper.
0b. That is, the printing paper introduced between the side plates 70, 70 is a paper sliding surface 70 which is an uphill slope.
a gives a U-shaped curve as viewed from the front direction, and is guided by the step surface 70b to slide while maintaining the curved shape, and reaches the front wall 66.

The inner surface of the side plate 70 is provided with a plurality of air vent holes 80 extending vertically to reduce the air resistance when the paper falls on the bottom plate 62.

According to the above-described configuration, the printed printing paper, which is peeled off from the cylindrical plate cylinder 10 and sent by the endless belt 42 on the paper discharging and conveying surface 32 to the paper discharging table 60, is first discharged. The sheet slides on the sheet sliding surface 46a of the first raised member 46 and the sheet sliding surface 48a of the second raised member 48 near and at the end of the transport surface 32, and thereby has a U-shape when viewed from the front. By being curved, the apparent rigidity along the sheet discharging direction is increased, and in this state, the sheet flies away from the sheet discharging conveyance surface 32 toward the bottom plate 62 of the sheet discharging table 60 by inertia force.

The printing paper which has flown from the paper discharge transport surface 32 is
As shown in FIG. 7 and FIG.
0, the paper sliding surface 70 as shown in FIG.
You start to slide on a. As a result, the front edge portions of the printing paper are warped upward, and the discharge tray bottom plate 62 is held in a state where the U-shaped shape is held by the paper sliding surface 70b.
You will be moving up. When the leading edge of the printing paper reaches the front wall 66 as shown in the figure, the falling of the printing paper due to its own weight proceeds while maintaining the U-shape, and as shown in the figure, both edges thereof The U-shaped curve is released by dropping over the sheet sliding surface 70b, and the sheet is placed on the sheet discharge tray bottom plate 62 in a flat state as shown in the figure.

From the above, it is possible to prevent the leading edge or both edges of the printing paper from hanging down at the paper output tray, and it is possible to prevent the printing paper from being misaligned or the printing paper already discharged onto the paper output tray bottom plate 62. Destruction of the upper surface, that is, the printed image surface, can be reliably avoided. The same effect can be obtained even if the step surface 70b is formed as an inclined surface that falls outward upward as viewed from the paper discharge bottom plate as shown in FIG. 9 in addition to the above-described embodiment.

[0021]

According to the present invention, before the leading edge of the printing paper reaches the front wall, the leading edge or both edges of the printing paper do not hang down due to the curl of the paper generated during printing. Thus, the flying state of the printing paper is maintained. For this reason, the leading edge of the printing paper does not advance while rubbing the upper surface of the printing paper already discharged onto the paper discharge base bottom plate, that is, the printing image surface, so that the printing image surface can be reliably prevented from being stained.
In addition, in the process of falling toward the paper output tray bottom plate, the printing paper falls without curling downward as viewed in a cross section perpendicular to the paper discharge direction in the middle of the printing paper, so that the paper discharge misalignment is also ensured. Can be avoided. From the above, the above object is surely achieved by the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view of a discharge tray of a conventional printing apparatus.

FIG. 2 is an explanatory diagram showing a paper discharge state in a conventional paper discharge table.

FIG. 3 is an explanatory view showing a paper discharge state in a conventional paper discharge table.

FIG. 4 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 5 is a plan view of the sheet discharging device shown in FIG. 4;

FIG. 6 is a perspective view of a sheet discharge tray in the embodiment.

FIG. 7 is a diagram illustrating a paper discharge state by the paper discharge table of the embodiment.

FIG. 8 is a diagram illustrating a paper discharge state by the paper discharge table of the embodiment.

FIG. 9 is a perspective view showing another example of the shape of the side plate used for the paper ejection tray according to the present invention.

[Explanation of symbols]

 Reference numeral 60 Discharge table 70 Side plate 70a Paper sliding surface as a guide surface 70b Step surface as a guide surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A printing apparatus according to claim 1, wherein a pair of side plates for regulating the position of the discharged printing paper are provided on a bottom plate. Is provided with a guide surface of the printing paper which is inclined upward in the paper discharge direction, and further, a guide surface of the printing paper projecting inward from the lower side is provided on the upper side of the inner side surface of the side plate. Discharge tray for printing equipment.