JPS5939646A - Paper feed control device - Google Patents

Abstract

PURPOSE:To prevent a miss paper feed by determining preset time beforehand based on the size of documents stored in a memory section and stopping the paper feed operation when detecting that no document has reached a predetermined position within the preset time from the start of the paper feed operation. CONSTITUTION:When a paper feed command is applied to a control section 14, the control section 14 first reads the length data TF between a hopper 1 and a detection position and the length data TS of a document 2 from a memory 22, calculates a time TFC from an equation TF+TS=TFC, then sets this time TFC in a timer section 17. The timer section 17 calculates the time from the present time T1. At the same time, the control section 14 feeds signals to driver circuits 5, 13, operates a motor 4 to drive paper feed rollers 3, 3' and also allows a light emitting diode 10 to emit light rays. Accordingly, the paper feed is started, and if the document 21 does not reach a photoelectric element 11 within said time TFC, the output of the timer section 17 is fed to the motor 4 through the control section 14 to stop it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a paper feed control device that controls a paper feed mechanism unit that supplies documents one by one to a conveyance path.

[Technical background of the invention]

In general, the paper feeding operation of an optical character reading device (hereinafter referred to as OCR) will be explained as follows. First, the documents stacked on the hopper are taken out one by one by the paper feed mechanism, and are conveyed to a predetermined position on the conveyance path by the conveyance mechanism. A detector is installed at this predetermined position.
This detector determines whether the form has reached a predetermined position. If the paper feeding operation is normal, the detector outputs a signal indicating that paper feeding is complete, and this signal indicates that the paper feeding is complete.
OcR can move on to the next operation. However, if a paper feeding error such as a paper jam occurs and the form does not reach a predetermined position, the detector will not output a signal indicating that paper feeding is complete no matter how many hours have passed. Therefore, conventionally, a predetermined allowable time for transporting a form is set in advance, and if the form does not reach a predetermined position within this time, it is regarded as a paper feeding error, and error recovery measures are taken.

By the way, general-purpose OCR handles various sizes of forms. For example, if you compare the smallest length or the largest length of the 1111° 1 to be handled, there is a difference of several times. Similarly, when comparing the areas, there is a difference of several times 1:10. When the sizes of the forms to be handled differ in this way, the time required for the forms to be conveyed from the hopper to the detection position also increases. That is, the larger the document, the greater the resistance during paper feeding and conveyance, so the opening time during tih feeding is shorter. Conversely, if the form is small, the resistance during paper feeding and transport is small, so the transport time is short. Assume that the above-mentioned allowable form conveyance time is determined based on the thickness of the form to be handled. If a small form is conveyed to a paper feeder that has been set with a long permissible form conveyance time, and if it gets caught in the paper feed mechanism for some reason, the situation will continue to deteriorate. This causes more damage to the form than necessary. Therefore, conventionally, the allowable time for transporting documents has been uniformly determined based on the smallest of the handled documents.

[Problems with background technology]

However, if the allowable time for transporting a form to be set in advance is determined based on the minimum form, the following drawbacks occur. In other words, when the paper feeding mechanism tries to feed a large form, the unexpected resistance increases compared to the smallest form.
The actual transport time is determined by the preset allowable form transport time (
Of course, this time is determined with a certain amount of margin in mind), but there are frequent cases where the time is slightly exceeded. Therefore, even if it should be treated as if the paper has reached a predetermined position, it is often judged as a paper feeding error.

[Purpose of the invention]

The present invention has been made in view of the above drawbacks, and its purpose is to:
The purpose is to set the permissible time for transporting a form according to the size of the form, and to reduce the probability of a paper feeding error being determined.

[Summary of the invention]

The present invention includes a paper feeding mechanism section that supplies a plurality of documents one by one to a conveyance path, and a paper feeding mechanism section that is provided at a predetermined position on the conveyance path, and detects whether or not the document has been conveyed at the predetermined position N, t. A detection unit, a timer unit that measures time from the start of paper feeding operation of the paper feeder (1), a storage unit that stores at least the size of the form to be fed, and A predetermined time is determined in advance based on the size of the form stored in the unit, and the detection unit detects the predetermined position within the predetermined time measured by the timer unit from the start of the paper feeding operation. If it is not detected that the document has arrived at 1lrj), the paper feeding control device is comprised of a control section that controls the paper feeding mechanism to stop its operation.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows OCl? according to the present invention. FIG. 2 is a configuration diagram showing an example of a paper feed control device of . In the figure, it is a hopper.

The top form 2 of this hopper lK stacked form 2
．． Introductory paper rollers 3 and 3' are provided so that the sides thereof are in contact with each other. Also, these two paper feed rollers 3, 3'
are made to rotate at the same time, and are rotated by the paper feed drive motor 4. The paper feed drive motor 4 is connected to a driver circuit 5. These, paper feed roller 3
, 3', from the paper feed drive motor 4 and the driver circuit 5,
Configures the paper-resistant mechanism section.

6.6' is a conveyance roller. The conveyance rollers 6 and 6' are rotated by the conveyance drive motor 7, and the side surfaces thereof rotate in contact with the side surfaces of the pinch rows 28 and 8', thereby pinching and conveying the form supplied from the sheet feeding mechanism section. It is something. The pinch roller 8.8' is always pressed against the conveyance roller 6.6' by a spring 9.9' fixed at one end.

10 is a light emitting element, 11 is a light receiving element, 12 is 1. a! hmm
It is Kabu. The light emitting element IO is located at one point on the form conveyance path.
It is provided with the light exit facing the direction. A light receiving element 11 is provided at a position facing this.

The light received by this light receiving element 11 is configured to reach an amplifier section 12. This amplifier section 12 includes an amplifier and an A
/D converter. This amplifier section 12 amplifies the output of the light receiving element 11 and performs A/D conversion.

Note that the light emitting element HJ is connected to the driver circuit 13. These light emitting element 10, light receiving element 11, amplifier section 12
, and the driver circuit 13 constitute a detection section.

14 is a control section. Control “If E’ 14 &J,
ξ's paper feeding device" is used to control the entire paper feeding device.
The self-driver circuits 5 and 13 are connected via the iil+control section 14 line 15 and ifi.

17 is a timer section. The timer section 17 is connected to the control section 1.
A predetermined time is measured by the signal supplied from ill through the signal lN13 from the amplifier section 12, and the signal line 19, 19' is valved to the signal supplied from the amplifier section 12.
Stop the measurement, turn on the signal I, and create the first copy [old cl.
It outputs the Ft number.

21 and 22 are memories. The memory 21 stores the signal i
Data on the size of the form is stored by the control unit 14 via the control unit 11 and the control unit 14. Note that this data is sent to @4 by the control unit 14.
+t/1. I feel like I'm being exposed.

The memory 22 stores data on the length between the hopper I and the detection position. Note that this data is read out by the control section 14 via a signal line.

The operation of the paper feed control device configured as described above will be explained with reference to the timing charts shown in FIGS. It is.

Generally, before starting reading a form, the OCR is given various data related to form reading assistance from the outside. In the memory 21,
It is assumed that among these data, data regarding the length of the form is stored under the control of the control unit 14.

First, when a paper feeding command is given to the control unit 14 from the outside,
The control unit (4) reads data T2 of the length between the hopper 1 and the detection position from the memory 22. Similarly, the data T8 indicating the length of the form is read from the 1 memory 21.

Next, the control section 14 performs TF+TB=TFc and sets this time TFC in the timer section 17. Figure 2 (a
) and (b), the timer unit 17 measures time from time T1 at this time. At the same time, the control unit 14 provides the driver circuit 5 with a paper feed command signal rntgh via the signal line 16, and causes the driver circuit 13 to cause the light emitting diode 1o to emit light via the signal line 15. give a signal. Paper feed drive motor 41-1
, starts rotation and drives the paper feed 5 roller 3.3'l. As a result, the uppermost form 21 stored in the hopper 1 is taken out, and is pushed while being held between the intershell rollers 6.6' and the pinch rollers 8.8'.

This form 2□ was detected by the detection unit
! 1': When the light receiving element 11 is reached, the image shown in FIG. 2 (a
It becomes as shown in t. That is, the light receiving element 11
Since the light is continuously cut off, the amplifier section 12 receives the signal W 19
, 19' to the timer section 17 via signals r1ttgh,
Outputs 1. In response to this signal, the timer section 17 outputs one pulse to the control section 14 via the signal signal. Due to this pulse, the III control unit 14 outputs the signal r Low J to the driver circuit 5 via the signal #'<N16 (time T2), and stops the rotation of the paper feed rollers 3 and 3'.

The above is an explanation of the S case in which the paper feeding *I+ operation and conveyance operation were performed normally.

On the other hand, if the form 21 does not reach the light receiving element 11 within the above-mentioned time TFC, the situation will be as shown in FIG. 2(b). That is, the timer section 17 starts from time T1 to time T.
After the FC has elapsed, one pulse is output to the control section 14. Due to this pulse (the timer 14 outputs the signal r Low J to the driver circuit 5 via the signal line 16 at time 'r), the rotation of the paper feed rows 23, 3' is stopped. In this case, paper feeding error recovery processing is required.

〔Effect of the invention〕

As explained above, according to the present invention, the permissible time for transporting a form is determined according to the size of the form, so that stable paper feeding is possible and paper jams can be avoided in the paper feeding structure. Damage to the form caused by scratches can be minimized.

Note that, according to the present invention, a conventional paper feeding device can be used without having to significantly change the hardware.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the device of the present invention, Figures 2 (a) and (b)
) is a timing chart for explaining the operation of the apparatus shown in FIG. 3.3'...Paper feed roller 10...Light emitting element 11...Light receiving element 14...Control section 17...Timer section 21, 22...Memory agent Patent attorney Kensuke Chika (1 other person)

Claims (1)

[Claims] a paper feeding mechanism unit that feeds the plurality of forms one by one to the conveyance path;
A detection unit is provided at a predetermined position on the conveyance path, and a detection unit detects whether or not the form has been fed to the predetermined position; and a timer unit is provided to measure the time from the start of paper feeding operation of the paper feeding mechanism unit. and a Me storage section that stores at least the size of the form to be fed; and based on the size of the form stored in the storage section, determine a certain time in advance, and perform the sheet feeding operation. If the detection unit does not detect that the form has reached the predetermined position within the predetermined time measured by the timer unit four times from the start, control is performed to stop the operation of the paper feeding mechanism. A paper feed control device consisting of a control section and a control section.