JPS6022440Y2 - File sheet identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for identifying the type of a sheet provided with punched holes for files while being fed by a pulse motor.

Recently, electronic counting machines have been used to process documents and slips that are required to be kept for a specified period of time, but these sheets have punched holes for filing purposes for convenient storage. On the other hand, processing with electronic counting machines ends or starts by printing data on these sheets or reading data from these sheets, but the printing format and reading format are determined depending on the type of sheet. It may be necessary to identify the type (especially size) of the sheet.

Conventional methods for mechanically identifying the size of a sheet include a method of detecting the total length of the sheet and a method of reading a special code attached to the sheet.

The above method further includes a method of detecting the passage of the leading edge and trailing edge of the sheet using one sensor, and determining the time from the time taken during that time, and a method of determining the position of the trailing edge when the leading edge of the sheet is detected. However, the first method has the drawback that the running speed of the sheet fluctuates and is not constant, making it difficult to identify the sheet, and that it cannot be identified unless the sheet is run over its entire length. This method requires at least one pair of sensors to detect each of the leading edge and trailing edge of the sheet, and has the disadvantage that the sheet must be stopped once the leading edge is detected.

Furthermore, the latter method of reading the code on the sheet has the disadvantage that it is necessary to print a code indicating the size on the sheet in advance.

The present invention focuses on punched holes for files, and eliminates the above drawbacks by using these punched holes and the feed pulse that drives the pulse motor to feed the sheet. will be described in detail below with reference to the drawings.

Figures 1a and 1b show examples of sheets suitable for carrying out the present invention, in which the left side ends of sheets 1 and 2 are provided with a pair of punch holes 3a at positions equidistant vertically from their center positions;
3b is provided.

The distance between the punch holes 3a and 3b is 1 square in every sheet, and the distance from the left end is also the same, and the center between the two punch holes is always located in the middle of the sheet.

Therefore, the distance from the top edge of the sheet to the first punch hole 3a varies depending on the size of the sheet.
In the case of , it is 12, and in the case of sheet 2, it is 13.

Figures 2 and 3 show an example of sheet feeding means.
Reference numeral 4 denotes a reference guide surface for guiding the travel of the seat 1, and the seat 1 travels with its left end aligned with this reference guide surface 4.

Reference numeral 5 denotes a clamp roller that clamps and feeds the inserted sheet 1 between it and the feed roller 6, which normally escapes upward, and comes into pressure contact with the feed roller 6 when the insertion of the sheet 1 is detected.

7 is a clamp magnet that operates the clamp roller 5 to the pressure contact position; 8 is a pulse motor that drives the feed roller 6 to feed the sheet 1; and 9 is provided at a position through which the punch holes 3a*3b of the sheet 1 pass. photo sensor,
10 is a light source that irradiates the photosensor with light.

FIG. 4 is a block diagram showing the circuit configuration of an embodiment of the present invention, in which 11 is an amplifying and rectifying circuit that amplifies the output signal of the photosensor 9 and shapes the waveform; 12 and 13 are clock signals - pL
14 is an AND gate for generating a differential pulse using the outputs of the flip-flops 12 and 13; A sheet feed control circuit that controls the feed operation of the sheet 1; 16 a pulse motor drive control circuit that controls the drive of the pulse motor 8;
17 is a feed pulse counter that counts the feed pulse FP supplied from the sheet feed control circuit 15 to the pulse motor drive control circuit, and 18 is a sheet information register that sets the contents of the feed pulse counter 17 based on the differential pulse.

Next, the operation of the above configuration will be explained.

As described above, the present invention provides the first punch hole 3a from the upper end of the sheet.
By focusing on the fact that the distance between the two sheets differs depending on the size of the sheet, this distance is used to identify the type of sheet.

When sheet 1 is inserted in the direction of the arrow shown in the figure, this sheet 1
blocks the light entering the photosensor 9 from the light source 10, and a detection signal of the sheet 1 is output from the amplification and shaping circuit 11.

This detection signal sets flip-flop 12 and subsequently flip-flop 13.

With the flip-flop 12 set, the sheet feed control circuit 15 sends an energizing signal to the clamp magnet 7.

When the clamp magnet 7 is energized, the clamp roller 5 moves from the previously retracted position to the sheet pressing position,
Hold sheet 1.

Further, the sheet feed control circuit 15 simultaneously sends out a feed pulse FP to the pulse motor drive control circuit 16.

The pulse motor drive control circuit 16 operates to rotate the pulse motor 8 by one step each time the feed pulse FP is supplied.

When the pulse motor 8 starts rotating, the sheet 1 is fed in the direction of the arrow shown in the figure by the rotation of the feed roller 6.

As long as there is no slippage between the sheet 1 and the feed roller 6, the amount of feed of the sheet 1 is proportional to the number of feed pulses FP, and therefore the amount of travel of the sheet 1 can be determined from the number of feed pulses FP.

The feed pulse FP is also supplied to the feed pulse counter 17 as well as the pulse motor drive control circuit 16.
The counter 17 counts up by one each time a feed pulse FP is applied.

When the first punch hole 3a reaches above the photosensor 9, the detection signal of the sheet 1 is temporarily interrupted and the flip-flop 13 is reset.

As a result, the differential pulse of the falling edge of the output of the flip-flop 13 is outputted from the AND gate 14, and the contents of the feed pulse register 17 at that time are set in the sheet information register 18.

The number of feed pulses set in the sheet information register 18 is the sheet feed amount from when the leading edge of the sheet 1 passes the position of the photosensor 9 until the first punch hole 3a reaches the position of the photosensor 9. It represents the distance from the front edge of the sheet 1 to the first punch hole 3a.

As described above, this distance varies depending on the size of the sheet, so the larger the sheet, the larger the value set in the sheet information register 18, and conversely, the smaller the sheet, the smaller the value.

The contents of the sheet information register 18 are transferred to a print control section or a reading control section (not shown) as sheet type identification information and then reset.

Thus, according to the above configuration, the type of sheet having punched holes for files can be identified with one sensor without using a special code, and this sensor can also be used in common for detecting sheet insertion. .

Furthermore, since the feed pulse for feeding the sheet is directly used to identify the type of sheet, the present invention is effective even if the sheet travels at various speeds.

Note that the present invention is not limited to the configuration of the above embodiment; for example, if a sensor is placed while the sheet is continuously running, it detects the leading edge of the sheet 1 and then punches the first hole. A similar effect can be obtained by providing a gate circuit that supplies feed pulses to a feed pulse counter only until detection, and counting the feed pulses only during that period.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a sheet suitable for carrying out the present invention, FIGS. 2 and 3 are diagrams showing an example of the configuration of a sheet feeding device, and FIG.
The figure is a block diagram showing one embodiment of the present invention. 1.2...Sheet, 3a, 3b...Punch hole, 5...Clamp roller, 6...
・Feed roller, 8...Pulse motor, 9・
... Photo sensor, 10 ... Light source, 15
... Sheet feed control circuit, 16 ... Pulse motor control circuit, 17 ... Feed pulse counter, 18 ... Sheet information register.

Claims (1)

[Scope of utility model registration request] A device that identifies the type of a sheet with punched holes for filing by feeding it using a pulse motor, which includes one sensor installed at a position where the punched hole passes through the sheet, and a sensor that detects the leading edge of the sheet. a sheet feeding means that clamps the sheet based on the detection and feeds the sheet by supplying a feed pulse to the pulse motor; and a counter that starts counting the feed pulses after the sensor detects the leading edge of the sheet. 1. A file sheet identification device, characterized in that the type of the sheet is identified based on the count value of the counter when the sensor detects a punch hole in the sheet.