JPS6137110Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a sheet feeding mechanism used in optical character reading devices and the like.

2. Description of the Related Art Conventionally, optical character reading devices and the like have been provided with a sheet feeding mechanism for conveying sheets, which are information media, one by one to a reading head. An example of this sheet feeding mechanism is shown in FIG. To briefly explain this, the reference numeral 1 is a sheet loading platform that is movable up and down on which a plurality of sheets 2 are stacked, and the reference numeral 3 is a sheet loading platform that is movable up and down. Feeding roller, 4
is a driving source for the feed roller 3; 5 is a pressure member that brings the sheets 2 on the sheet stacking table into contact with the feed roller 3 with a certain pressure; and 6 is a pressure member that causes the feed roller 3 to feed out a plurality of sheets 2 at the same time. It is a separate member that applies a brake to sheets other than the top layer, and is constantly pressed toward the feeding roller 3 by a spring 7. 8 and 8' are feeding rollers 3
9 is a driving source thereof, 10 is a sheet detection sensor, and 11 is a solenoid for lowering the sheet loading platform 1 to facilitate sheet loading operations.

In such a sheet feeding mechanism, sheets are conveyed one by one, so when the sheet detection sensor 10 detects a sheet, this sheet detection signal is used as a trigger to stop the drive source 4 of the feeding roller 3. There is. However, even if the drive source 4 of the feed roller 3 is stopped, as shown in FIG.
Since the roller a is still engaged with the feeding roller 3, the feeding roller 3 receives a rotational force in the sheet conveyance direction. If a braking force that exceeds this rotational force is applied to the feed roller 3, the rotation will stop, but the roller will slip against the running sheet 1a, causing wear. In order to prevent this wear, when the structure of the feeding roller 3 is made so that it can rotate following the sheet 1a conveyed by the conveying rollers 8, 8', as shown in FIG.
Since the leading end of sheet b is held by the separate member 6, the portion that abuts against the feeding roller 3, which rotates as the first sheet 1a travels, is fed and may cause the sheet to fold. The present invention was devised to solve these problems.

Therefore, in the sheet feeding mechanism of the present invention, there is provided a sheet loading table which is capable of stacking a plurality of sheets and is movable up and down, and a sheet that contacts the topmost sheet of the sheets stacked on the sheet loading table. A feeding roller that feeds out the sheet by friction, a pressure member that brings the sheets on the sheet loading platform into contact with the feeding roller with a certain pressure, and a A separate member that brakes sheets other than the upper layer, a conveyor roller that continues to convey the sheet fed out by the feed roller, a sensor that detects the sheet conveyed by the conveyance roller, and a feed roller that is triggered by a signal from the sensor. The present invention is characterized in that it includes a control means for stopping the drive source of the sheet stacking table and lowering the sheet loading table at the same time.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 4 shows a configuration diagram of the embodiment. In the figure, the same components as those of the sheet feeding mechanism shown in FIG. 1 are denoted by the same reference numerals. Therefore, numeral 1 is a sheet loading platform, 2 is a sheet, 3 is a feeding roller, and 4 is a sheet loading table.
is its driving source, 5 is a pressure member, 6 is a separate member, 7 is its pressure spring, 8 and 8' are conveyance rollers,
Reference numeral 9 represents a driving source thereof, reference numeral 10 represents a sensor for detecting the presence or absence of a sheet, and reference numeral 11 represents a solenoid for lowering the sheet loading platform 1. This embodiment further adds a sheet detection sensor 12 and a controller 13 to the above configuration,
The sheet detection sensor 12 and the sheet detection sensor 10 are wire-connected to a controller 13, and the controller 13 is wire-connected to the drive source 4 of the feed-out roller 3 and the solenoid 11 to control the feed-out roller 3 and the solenoid 11. It was established. Note that the feed roller 3 is configured to be able to rotate following the running of the sheet even if its drive source 4 is stopped.

The operation of this embodiment configured as described above will be explained next. First, the sheet 2 is fed out by the feeding roller 3. Of the plurality of sheets fed out, the sheets other than the top layer are braked by the separate member 6 and held there. The uppermost sheet fed out by the feeding roller 3 is subsequently conveyed by conveying rollers 8, 8'. When this sheet reaches the sensor 10, the sensor 10 stops the drive source 4 of the feed roller 3 via the controller 13, and drives the solenoid 11 to lower the sheet loading platform 1, and the sheet 2 and the feed roller 3 are moved. disconnect from contact. The uppermost sheet is still conveyed by the conveyor rollers 8, 8', but the feed roller 3 rotates following the sheet. The rear end of the sheet is separated from the feed roller 3, and the leading edge is located at the sensor 12.
Once reached, sensor 12 resets controller 13. As a result, the feed roller 3 starts driving rotation, and feeds out the second sheet held by the separate member 6. At the same time, the sheet stacking table 1 rises, brings the sheet 2 into contact with the feed roller, and causes the next sheet to be fed and held by the separate member 6. In this way, the sheets are fed out one after another, but until the preceding sheet reaches the sensor 12, the feeding roller 3 and the sheet 2 on the sheet stacking table are not in contact with each other. Even if the next sheet is rotated following the rotation, the next sheet held by the separate member 6 will not be folded.

As explained above, the sheet feeding mechanism of the present invention is capable of preventing the wear of the feeding roller and the occurrence of sheet folding by providing a control means for controlling the driving of the sheet feeding roller and the raising and lowering of the sheet loading platform. That is.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an example of a conventional sheet feeding mechanism, FIGS. 2 and 3 are explanatory diagrams illustrating the occurrence of sheet folding, and FIG. 4 is a schematic diagram of an example of a sheet feeding mechanism according to the present invention. It is a formula diagram. 1...Sheet loading table, 2...Sheet, 3...Feeding roller, 4...Driving source for the feeding roller, 5...
. . . Pressure member, 6 . . . Separate member, 7 . . . Spring, 8, 8' .

Claims (1)

[Scope of utility model registration request] A sheet loading table capable of stacking a plurality of sheets and movable up and down; a feeding roller that comes into contact with the top layer of the sheets stacked on the sheet loading table and feeds out the sheets by friction; and the feeding roller. a pressure member that brings the sheets on the sheet stacking platform into contact with a certain pressure against the sheet stacking platform; and a separate member that applies a brake to sheets other than the top layer when a plurality of sheets are fed out from the sheet stacking platform. A conveying roller that continues to convey the sheet fed out by the feeding roller, a sensor that detects the sheet conveyed by the feeding roller, and a sheet loading table that uses the signal of the sensor as a trigger to stop the driving source of the feeding roller. and a control means for lowering the sheet.