JPS5825469Y2 - Sheet conveyance device - Google Patents

Description

[Detailed description of the invention] This invention is used in devices that optically read information on sheets, such as optical character reading devices, optical mark reading devices, printers that print information on sheets, and other information input or output devices. The present invention relates to a conveyance device.

A conventional device of this type was constructed as shown in FIG.

That is, FIG. 1 shows a schematic configuration of a conventional optical reading device, in which 2 is a sheet on which information to be read is recorded;
is a feed roller that feeds the sheet 2; 4 is a chassis that serves as one guide during the movement of the sheet 2; 5 is a chassis that maintains a predetermined distance from the chassis 4 along the upstream side in the traveling direction of the sheet 2; The upper guide 7 is provided with an opening of a predetermined size between it and the upper guide 5 on the downstream side in the traveling direction of the sheet 2, and is spaced along the chassis 4 at a predetermined distance from the chassis. The disposed discharge side guide 3 is a reading sensor such as a photodiode array including an optical system such as a lens, and is disposed at a predetermined distance in the opening between the upper guide 5 and the discharge side guide I. has been done.

Reference numeral 1 denotes a light source that illuminates the sheet 2 from the opening, and the light from this light source is reflected on the upper surface of the sheet 2 on which information is written and enters the reading sensor 3 along a path shown by an arrow.

The sheet 2 is fed by a feed roller 6 between a chassis 4 and an upper guide 5, which are adjusted and set so that the focal length of the reading sensor 3 matches.

A discharge side guide 7 is provided between the upper guide 5 and the opening required by the optical system, but this discharge side guide 1 does not allow the sheet 2 to curl or break at the leading edge, causing warping. In order to prevent sheet jamming when the sheet is raised, it has an upwardly sloped portion 71 as shown in the figure.

In such a device, when the sheet 2 is significantly warped, the ejection side guide 1 cannot press the sheet 2 against the chassis 4 at the inclined surface 11, so the sheet reading portion also moves against the chassis 4.
It floats upwards without following.

As a result, the reading sensor 3 becomes out of focus, making it impossible to read, or if reading is performed after the leading edge of the sheet has passed the slope to avoid this, the area near the leading edge of the sheet cannot be read. .

In addition, in another conventional example, a hole is made in the chassis 4 shown in Fig. 1, and vacuum suction is applied from below, and the sheet 2 is attracted to the chassis 4 to prevent out-of-focus caused by warping of the sheet, but this requires a vacuum device and is expensive. It had some drawbacks.

Further, in general in this type of apparatus, if it takes a short time to read, even a sheet with a small degree of warpage will become noticeably warped due to the heat of the light source, so consideration must be given to the warpage of the sheet.

This invention solves the above-mentioned conventional drawbacks and provides a sheet conveying device that can perform stable conveyance, input, or output operations even for sheets with warpage.

Hereinafter, details will be explained according to an embodiment of the sheet conveying apparatus according to this invention.

Figure 2 shows when the sheet is being conveyed to the reading position.
FIG. 3 shows when the sheet is read.

In FIGS. 2 and 3, 1 is a light source, 2 is a sheet, and 3 is a reading sensor.

Light emitted from a light source 1 is reflected on the upper surface of a sheet 2 on which information is written as shown by an arrow, and is incident on a reading sensor such as a photodiode array that includes an optical system such as a lens.

The information on sheet 2 is then read.

4 is a chassis, 5 is an upper guide, 6 is a feed roller, and I is a discharge side guide.The chassis 4 is adjusted and set so that the focal length of the reading sensor 3 is matched.
An upper guide 5 and a discharge side guide I are provided at the minimum interval required for sheet conveyance, and the chassis 4 and upper guide 5
The sheet 2 is sent by the feed roller 6 in the direction of the arrow between 0 and 0.

8 is a moving guide, 9 is a shaft, and 10 is a bearing.

The moving guide 8 has one end fixed to a shaft 9, and the shaft 9 is supported by a bearing 10 so as to be rotatable.

A rotary linenoid (not shown) that provides rotational force is connected to one end of the shaft 9, and the solenoid is driven by a control signal to the position shown in Fig. 2 during conveyance and to the position shown in Fig. 3 during reading. Rotate the shaft.

When conveying the sheet, the opening between the upper guide 5 and the carry-out guide 7 required by the optical system is not required, so as shown in FIG.
By positioning the upper guide 5, the upper guide 5,
Since a sheet guide can be set that is continuous with the moving guide 8 and the discharge side guide 7, jamming will not occur even if the sheet has a warped tip.

When the leading edge of the sheet is on the discharge side guide, as shown in Figure 3, move the moving guide 8 from the opening to a position that does not interfere with the optical system, create an opening, and move the moving guide 8 to a position relatively close to the leading edge on the sheet. You can start reading from.

At this time, even if the sheet 2 is warped, it is held down by the side exit guide 7, so that the sheet 2 can be read while remaining fully aligned with the chassis 4.

Therefore, the reading sensor 3 does not become out of focus.

Note that the timing control of sheet conveyance and movement of the moving guide is achieved, for example, as follows: 1. Detecting the point in time when the leading edge of the sheet touches the discharge side guide during sheet conveyance.

This detection is performed by, for example, a photo sensor, which has conventionally been used to detect that the sheet has reached the reading start position.

1i Based on the above detection signal, sheet conveyance is stopped as in the conventional case, and at the same time, the rotary solenoid is driven to move the movement guide 8.

1i [At the point in time when the moving guide 8 has moved from the opening to a position that does not interfere with the optical system (this point in time can be set, for example, by a timer or by a sensor that detects when the moving guide has reached the movement completion position), Reading is started, and the sheet is conveyed while reading one line at a time, as in the conventional case.

1v Sea) - When the continuation of one sheet is completed, the completion signal issued from the reading control section causes the reading completed sheet to be ejected, as in the conventional case, and at the same time, the rotary lenoid is driven in the opposite direction, and the movement guide 8 Return to the opening and wait for the next sheet to be transported.

As mentioned above, this idea allows for stable conveyance of sheets with curls to the reading position without causing jamming, and allows for defocusing from an area relatively close to the leading edge of the sheet. It can be read without any problem.

A sheet conveying device in an optical reading device can be realized.

Note that the sheet conveying device of this invention is not limited to optical reading devices, but can also be used in devices such as printers that require an opening at the printing position and that opening may cause jamming when conveying sheets. It can be used in the same way.

That is, this invention can be implemented in a sheet conveying device of a device that inputs information on a sheet or a device that outputs information on a sheet.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional device, Fig. 2 is a block diagram showing an embodiment of this invention during sheet conveyance, and Fig. 3 is a block diagram showing an embodiment of this invention during reading. , 1 in the figure
2 is a light source, 2 is a sheet, 3 is a reading sensor, 4 is a chassis, 5 is an upper guide, 6 is a feed roller, 7 is a discharge side guide, 8 is a moving guide, 9 is a shaft, and 10 is a bearing. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a chassis that serves as one guide when moving the sheet; an upper guide disposed along the chassis on the upstream side in the sheet's traveling direction at a predetermined distance from the chassis; and an upper guide on the downstream side in the sheet's traveling direction. A device for inputting information on a sheet through the opening, comprising an opening of a predetermined size between the guide and the discharge side guide arranged along the chassis at a predetermined distance from the chassis. Or, in a sheet conveying device of a device that outputs information on a sheet, when the sheet is conveyed to the input or output position, the opening is positioned at the opening, and a gap equivalent to the upper guide and the discharge side guide is provided. A moving guide is provided, which faces the chassis with the opening, and when conveyance of the sheet to the input or output position is completed, the moving guide is configured to be moved from the opening to a position that does not impede input/output to the sheet. A sheet conveying device featuring: