JPH0540957U - Medium transport device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the feeding operation of the medium is defective, it is detected and the feeding operation is retried, so that the medium is normally conveyed. [Structure] The feeding of the medium 43 is performed by the paper feed rollers 10 and 11. An inlet sensor 13 is provided between the paper feed roller 11 and the transport roller 16, and a timing sensor 44 is provided downstream of the transport roller 16 in the transport direction. If the timing sensor 44 does not detect the medium 43 within a fixed time after the conveyance roller 16 is rotated, the paper feed roller 1
Re-drive 0 and 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a medium conveying device that separates a medium such as a read document or a printing device for each sheet and automatically conveys the medium.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, there are some medium transporting devices that automatically transport a medium, which are connected to a reading device or a printing device. FIG. 5 shows an image input device in which the medium conveying device and the reading device are connected. In the figure, the image input device 1 is composed of a handheld scanner 2 which is a reading device and a medium carrying device 3, and the handy scanner 2 is detachable from the medium carrying device 3. The medium carrying device 3 is provided with a loading platform 4 for loading the medium to be read and a receiving platform 5 for loading the medium after reading, and an interface cable 6 between the handy scanner 2 and the host device. The cables 7 to be connected are respectively connected.

Next, the internal structure of the image input apparatus 1 will be described with reference to FIG. FIG. 6 is a schematic structural diagram showing the inside of the image input device.

First, the inside of the transport device 3 will be described. Paper feed rollers 10 and 11 are provided substantially above the medium stacking table 4. A separation pad 12 is attached to the lower part of the paper feed roller 11 in pressure contact with it, and the fed medium is separated into one sheet. An inlet sensor 13 is arranged on the left side of the separation pad 12. The transport motor 14 rotates the transport rollers 16, 17, and 18 via the belt 15 and thereby transports the medium. A read timing pulse generation circuit 19 is provided in the transport device 3.

The handy scanner 2 is provided with a line image sensor 20 for reading a medium substantially in the center. The line image sensor 20 mainly includes a light source 21, a lens 22, and a solid-state image sensor 23. A transport roller 16 is provided in front of the medium reading position to keep the medium feeding speed constant. A rotatable guide roller 24 is provided so as to face the transport roller 16, and a rotatable sub roller 25 is provided so as to face the transport roller 18. In this way, the guide roller 24 of the handy scanner 2 is used as an opposing roller of the carrying roller 16 on the carrying device 3 side, so that the carrying device 3 can be downsized.

Next, the operation will be described with reference to FIGS. 6 and 7. FIG. 7 is a time chart showing a conventional medium transport operation.

In FIG. 6, first, the medium 43 is set on the loading table 4. Next, when the paper feed rollers 10 and 11 are rotationally driven (point a in FIG. 7), the medium 43 is fed in the direction of arrow A. At this time, only the topmost sheet is sent by the separation pad 12. When the tip of the medium 43 reaches the inlet sensor 13 (point b in FIG. 7), the inlet sensor 13 detects that the medium 43 has been fed. Next, from this point, the paper feed rollers 10 and 11 are rotated for a certain time (t shown in FIG. 7), the leading edge of the medium 43 enters the contact portion between the transport roller 16 and the guide roller 24, and the medium 43 is slightly moved. Allow it to bend. After the elapse of the certain time (t), the carry motor 14 is rotated (point c in FIG. 7) to carry the medium 43 to the reading position.

When the medium 43 passes below the line image sensor 20, the image thereof is read by the line image sensor 20. The reading timing at this time is obtained by the reading timing pulse generation circuit 19 in the carrying device 3.

The image information read by the line image sensor 20 is temporarily stored in a line memory (not shown) in the carrier device 3 as an electric signal, and then transferred to a higher-level image processing device by an interface cable 9 shown in FIG. Sent.

[0010]

[Problems to be solved by the device]

 However, in the above-described conventional apparatus, the friction coefficient of the upper surface of the medium, that is, the surface that comes into contact with the paper feed rollers 10 and 11 when being fed from the medium stacking table 4, is low, and the friction of the lower surface, that is, the surface that comes into contact with the separation pad 12, A medium having a high coefficient is likely to cause slippage between the medium and the paper feed rollers 10 and 11. If slippage occurs, the amount of feeding the medium becomes insufficient, and it may not be possible to hit the contact portion between the transport roller and the guide roller. There is a problem that the medium is not conveyed even if the conveying roller 16 is driven in such a state.

The present invention has been made in view of the above problems, and an object thereof is to provide an excellent medium transporting device that reliably transports a medium.

[0012]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has a feeding means for feeding a medium, a conveying means for waiting a medium fed from the feeding means and conveying the medium, and a detecting means for detecting the medium conveyed by the conveying means. If the medium is not detected by the detecting means even after a lapse of a certain time after the conveying means is driven, the feeding means is driven again.

[0013]

[Action]

 The medium is fed by the feeding means and abutted on the conveying means. After that, the medium is conveyed by the conveying means, but the medium may not be sufficiently abutted against the conveying means due to slip between the medium and the feeding means. Therefore, the detection means checks whether or not the medium is detected within a fixed time after the transport means is driven. When the medium is not detected by the detecting means, the feeding means is driven again to feed the medium.

[0014]

【Example】

 An embodiment according to the present invention will be described below with reference to the drawings. Note that elements common to the drawings are given the same reference numerals.

FIG. 1 is a partially enlarged view showing an embodiment according to the present invention. In FIG. 1, the medium 43 is stacked on the medium stack 4 and is fed by the paper feed rollers 10 and 11. The paper feed rollers 10 and 11 are rotationally driven by a paper feed motor 62 shown in FIG. A separation pad 12 is in pressure contact with the paper feed roller 11. An inlet sensor 13 for detecting the medium 43 is arranged on the left side of the sheet feeding roller 11, and a conveying roller 16 and a guide roller 24 which is in pressure contact with the conveying roller 16 are rotatably provided on the left side thereof. The carrying roller 16 is driven by the carrying motor 14 shown in FIG. A timing sensor 44 for detecting whether or not the medium 43 is reliably transported by the transport roller 16 is disposed on the left side of the transport roller 16 and immediately downstream of the transport direction of the medium.

FIG. 2 is a block diagram showing the transport control of the embodiment. In the figure, a control unit 63 controls the conveyance operation of the medium 43, receives signals from the inlet sensor 13 and the timing sensor 44, and controls the conveyance motor 14 and the feeding motor 62 based on the signals.

Next, the operation of the embodiment will be described with reference to the time chart shown in FIG. 3 and the flow chart shown in FIG.

First, the controller 63 drives the feeding motor 62 (point a in FIG. 3) to rotate the paper feeding rollers 10 and 11 (step 1). The media 43 is thereby dispensed and the separation pad 12 delivers only the top one. When the front end of the medium 43 reaches the entrance sensor 13 (point b in FIG. 3, step 2), the control unit 63 detects this from the signal from the entrance sensor 13. The control unit 63 detects the leading edge of the medium 43 for a fixed time (t shown in FIG. 3).₁) The conveyance motor 14 is driven (point c in FIG. 3, step 3), and the feeding motor 62 is stopped (step 4). This fixed time t ₁ Is set to the feeding time until the medium 43 reaches from the entrance sensor 13 to the contact portion between the conveying roller 16 and the guide roller 24, and as shown in FIG.

When the medium 43 is delivered normally and the leading end thereof is abutted against the contact portion between the transport roller 16 and the guide roller 24, the medium 43 is further transported by the rotation of the transport roller 16, and the timing sensor It is detected by 44 (point d in FIG. 3, step 5). Note that, in FIG. 3, the dotted line shows the operation at the normal time. However, if a slip occurs between the paper feed rollers 10 and 11 and the medium 43 for some reason, the intended flexure does not occur, and worse, the front end of the medium 43 and the guide roller 16 and the guide roller. Even if the conveyance roller 16 does not reach the contact portion with the roller 24, the conveyance roller 16 is not conveyed. If the timing sensor 44 does not detect the medium 43 even after a lapse of a certain time (t ₂ shown in FIG. 3) after driving the carry motor 14, the control unit 63 stops the carry motor 14 and feeds it. The feed motor 62 is driven (point e in FIG. 3, step 7). That is, the paper feed rollers 10 and 11 are rotated again for a certain period of time to feed the medium 43. The fixed time in this case is set shorter than the feeding time in step 1. Thereafter, the control unit 63 stops the feeding motor 62 and drives the carry motor 14 again (point f in FIG. 3, step 8). If the medium 43 is normally abutted on the contact portion between the conveying roller 16 and the guide roller 24 by re-driving the feeding motor 62 in step 6, the medium 43 is normally conveyed by driving the conveying motor 14 in step 7. It In this way, if the medium 43 does not reach the timing sensor 44 within a certain time in one feeding / transporting operation, the feeding operation is retried to enable a normal transporting operation.

If the timing sensor 44 does not detect the medium 43 even after retrying the feeding operation a plurality of times (n times) (steps 9 and 10), an alarm is generated (step 11).

Although the medium transporting device of the above embodiment is described as a device connected to the handy scanner, it goes without saying that the present invention can be applied to a printing device or a copying machine that needs to transport a medium. Absent.

If the medium does not reach the entrance sensor 13 after a lapse of a certain time from the start of feeding, an alarm is generated as a feeding error. At this time, you may repeat feeding. In this case, as in the case of the first sheet feeding, the sheet feeding amount is the sum of the amount that reaches the entrance sensor 13 and the amount that is driven for a fixed time thereafter.

In the case of the present invention, re-feeding is performed with a smaller amount of paper feeding than in the case of the above-mentioned paper feeding error.

[0024]

[Effect of the device]

 As described above in detail, according to the present invention, the feeding operation is retried if the medium is not detected within a fixed time after the conveyance roller starts rotating, so that the medium is fed by one feeding operation. It is possible to normally convey the medium even if the medium has not reached the conveying roller normally.

[Brief description of drawings]

FIG. 1 is a partially enlarged view showing an embodiment according to the present invention.

FIG. 2 is a block diagram showing conveyance control according to the embodiment.

FIG. 3 is a time chart showing the operation of the embodiment.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is an external view showing an image input device.

FIG. 6 is a schematic structural diagram showing the inside of the image input device.

FIG. 7 is a time chart showing a conventional medium transport operation.

[Explanation of symbols]

 10, 11 Paper feeding roller 13 Entrance sensor 16 Conveying roller 43 Medium 44 Timing sensor 63 Control unit

Claims (1)

[Scope of utility model registration request] 1. A feeding means for feeding a medium onto a conveying path, a medium conveying means provided on the conveying path, a detecting means provided downstream of the medium conveying means for detecting the presence or absence of the medium, and a detecting means. And a control means for driving and controlling the feeding means and the medium transporting means based on the output of the A medium carrying device characterized by driving a feeding means for a short time.