JPS59182141A - Medium conveying device - Google Patents

Abstract

PURPOSE:To enable to convey a medium steadily when the medium is conveyed from the first driving roller to the second one by the difference of the peripheral velocities of both rollers and the work of a play clutch provided on the first driving roller. CONSTITUTION:The first driving roller 12 and the second driving roller 13 are provided to be rotated by the driving force given from a rotation driving source 1 via transmission shafts 8-10, and a medium 11 is held between the roller 12 and the first driven roller 14 to be conveyed to the side of the roller 13 and the second driven roller 15. In this device, a clutch 20 is provided between the roller 12 and a driving force transmitting part, and the peripheral velocity of the periphery of the roller 13 is made greater than the peripheral velocity of the roller 12. That is, when the conveyed medium 11 is held between the roller 12 and the roller 15, the clutch 20 is disengaged due to the difference of the conveying speed between the rollers 12 and 13, and the rollers 12 and 14 are rotated according to the conveyance of the medium as holding the medium between.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to a medium conveyance device for conveying a medium such as a magnetic card or sheet paper to a magnetic card device or a recording section of a line printer, etc. The present invention relates to a medium conveyance device that can prevent the medium from shaking when the medium is conveyed from the second roller to the second roller, and can stabilize the conveyance speed at the second roller.

(21 Prior Art and Problems) This type of conventional media conveying device, as shown in Fig. 1,
From the rotational drive #1 of a motor etc. via a pulley 2.3.4.5, a transmission belt 6.7 and a transmission shaft 8.9.10, a first A driving force is applied to the driving roller 12 and a second driving roller 13 provided on the back side thereof, and a first driven roller 14 is applied to the first and second driving rollers 12 and 13, respectively.
And the second driven roller 15 was pressed. Then, the medium 11 is pushed in through the input port, sandwiched between the first driving roller 12 and the first driven roller 14, and directed toward between the second driving roller 13 and the second driven roller 15 as shown by arrow N. It was being transported. Here, when the medium 11 moves in the direction of the arrow and its leading end is transferred between the second driving roller 13 and the second driven roller 15, the leading end and rear side of the medium 11 are moved to the second driven roller, respectively. The medium is held and conveyed by the roller 13 and the first drive roller 12, and the rotations of the two drive rollers 12 and 13 interfere with each other via the medium 11, causing uneven rotation and keeping the conveyance speed constant. There were things I didn't do.

To deal with this, as shown in FIG. Move the lever 16 in the direction of arrow B around the pivot point 17 at the end.
, some are rotatable in the C direction. Then, the medium 11 held between the first driving roller 12 and the first driven roller 14 is conveyed in the direction of arrow A and is held between the second driving roller 13 and the second driven roller 15. The lever 16 is rotated in the direction of arrow B to release the first driven roller 14 from pressing the medium 11 against the first driving roller 12. From then on, the medium 11 is held only by the second driving roller 13 and the second driven roller 15. There are some that are designed to be transported.

However, in this case, when the lever 16 is rotated in the direction of arrow B and the clamping by the first driven roller 14 is released,
Sometimes the rear end of the medium 11 was lifted or swung left and right with respect to the conveyance direction. therefore,
The front side of the medium 11 also oscillates accordingly, resulting in poor reading accuracy by, for example, a magnetic head provided near the second driven roller 15, or erroneous reading.

(3) Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and when the medium is transferred from the first stage roller to the second stage roller, the medium oscillates. It is an object of the present invention to provide a medium conveyance device that can completely stabilize the conveyance speed of the second stage roller without causing any problems.

(4) Structure of the Invention and the above-mentioned object is that the present invention has a first drive roller and a second drive roller which are rotated by being given a driving force from a rotational drive source via transmission @, and each of these drive rollers. It has a first driven roller and a second driven roller that are rotated by being pressed by the roller, and the medium is held between the first driving roller and the first driven roller and conveyed to the second driven roller and the second driven roller side. In the medium conveyance device, a clutch is provided between the first drive roller and its drive force transmission section, and the circumferential speed of the outer peripheral surface of the second drive roller is greater than the circumferential speed of the first drive roller. When the conveyed medium is sandwiched between the second driving roller and the second driven roller, the clutch is disengaged due to the difference in conveying speed between the two driving rollers, and the first driving roller and the second driven roller are disengaged. This is achieved by providing a medium conveyance device characterized in that the one driven roller rotates as the medium is conveyed while holding the medium between them.

(5) Embodiments of the invention Hereinafter, embodiments of the invention will be described in detail based on accompanying drawings.

FIG. 2 is a schematic plan view showing a medium transport device according to the present invention. A pulley 2 is attached to a drive shaft 1' of a rotational drive source 1 such as a motor, and a pulley 2 and a second drive roller 1 are connected to each other.
A transmission belt 6 is suspended between a pulley 3 attached to a transmission shaft 8, which is an extension of the transmission shaft 10 of the transmission shaft 10 of the transmission shaft 3. Another pulley 4 is attached to the transmission shaft 8, and another transmission belt 7 is suspended between this pulley 4 and a pulley 5 attached to the transmission @9 of the first drive roller 12. It's being passed around. As shown in FIG. 3, a first driven roller 14 and a second driven roller 15 are pressed onto the outer circumferential surfaces of the first driving roller 12 and the second driving roller 13, respectively, so as to be rotatable.

Here, in the present invention, the first drive roller 12 is
It is loosely fitted to the transmission shaft 9 so as to be freely rotatable, and the transmission II! Between 1f19 and the first drive roller 12, there is a connection between the first coupling bin 1B planted on the transmission shaft 9 and the second coupling bin 19 planted on the (if!1 side) of the first drive roller 12. A combination idler clutch 20 is provided.This clutch 20 connects the transmission shaft 9 to the first drive roller 12.
It is considered "tangential" only when applying rotational force to. Therefore, when rotational driving force is applied from the rotational driving source 1 via the pulley 2.3.4.5, the transmission belt 6.7, and the transmission @8.9, the first coupling bin 18 is connected to the second viscous bottle 1
When the first drive roller 12 rotates faster than its transmission shaft 9 due to an external force or the like, the second coupling pin 19 separates from the first coupling pin 18 and the clutch 20 engages. It becomes "no".

Further, in the present invention, the circumferential speed of the outer circumferential surface due to the rotation of the second drive roller 13 is greater than that of the first drive roller 12. That is, the third
As shown in the figure, when the diameter dl of the pulley 5 provided on the transmission shaft 9 of the first drive roller 12 is equal to the diameter d2 of the pulley 4 provided on the transmission shaft 10 of the second drive roller 13, The diameter D2 of the second drive roller 213 is the first drive roller 1.
2's diameter D1 and υ are also increased. Alternatively, when the diameter D1 of the first drive roller 12 and the diameter D2 of the second drive roller 13 are equal, the diameter d2 of the pulley 4 is made smaller than the diameter dl of the pulley 5.

The above relationship can be expressed numerically as follows.

Now, assuming that the rotational speed of the transmission shaft 8.10 is N2, the conveyance amount L2 of the medium 11 such as a magnetic card by the outer peripheral surface of the second drive row 213 is as follows: L2=πD2N2 (1 ).

Next, when the number of rotations of the transmission shaft 9 is N, the conveyance amount L1 of the medium 11 by the outer peripheral surface of the first drive roller 12 is L1=
πD1N1, then N1d1=. and,
In the present invention, the circumferential speed of the outer periphery (2) due to the rotation of the second drive roller 13 (the conveyance amount L2 is proportional to this) is the circumferential speed of the first drive roller 212 (the conveyance amount L1 is proportional to this)
Since it is larger than , L2>L. therefore,(
From equations 1) and (2), the following equation (3) holds true: 2 D2 ) Dt dt . Transforming this results in . In other words, the pulley 4.5 and each drive roller 12.13 are
What is necessary is to determine the diameter di%d2, Dl, and D2.

Note that the idle clutch 20 is not limited to the one shown in FIG. 2; as shown in FIG. 9 may be planted. In this case, the first drive roller 12 is fixed to the transmission 111] 9, and the pulley 5 at the end thereof is loosely fitted to the transmission shaft 9 so as to be freely rotatable. In addition, as shown in FIG. 5, the pulleys 3 and 4 provided on the transmission shaft 8 of the second drive roller 13 are separated, and the first coupling pin 18'' is attached to the transmission shaft 8 between the pulleys 3 and 4. Plant the second binding bottle 19
# may be planted on the side of the pulley 4. In this case, the pulley 4 is loosely fitted around the transmission shaft 8 so as to be freely rotatable.

In addition, the transmission shaft 8.9.10 is N1 and N shown in FIG.
If the rotation is only in two directions and not in the opposite direction, a one-way clutch may be provided in place of the idle clutch 20.

Next, the operation of the medium conveying device configured as described above will be explained with reference to FIG. 6. First, as shown in (a), a medium 11 such as a magnetic card is inserted from the slot 21 in the direction of the arrow. This input port 21 has a transmission type detection sensor consisting of a combination of a light emitting part 22 and a light receiving part 23. When this detection sensor detects passage of the medium 11, it activates the rotational drive source 1 shown in FIG. drive.

This causes the pulley 2.3.4.5 and the transmission belt 6.
7 provides the driving force to the transmission shaft 8.9.10. Here, since the second drive roller 13 is fixed to the transmission shaft 10, it immediately rotates in the direction of arrow B, but the first drive roller 13
2 starts to rotate only when the first coupling pin 18 provided thereon rotates as the transmission shaft 9 rotates and is abutted and coupled with the second coupling pin 19 provided on the first drive roller 12. . In this way, the first drive roller 12 rotates in the direction of arrow C, and this first drive roller 1
2 and the first driven roller 14, the medium 11 is conveyed to the second driving roller 13 and second driven roller 15 side.

Next, the medium 11 is conveyed in this manner, and the leading end of the medium 11 is sandwiched between the second driving roller 13 and the second driven roller 15, as shown at (1+).

At this time, the circumferential speed of the outer circumferential surface of the second drive roller 213 is set higher than that of the first drive roller 12, so that the medium 11 is transferred between the second drive roller 13 and the second driven roller 12.
It is pulled in the direction of arrow A' by being held between the two. Then,
The first driving roller 12 starts rotating under the pressure of the first driven roller 14, which holds the medium 11 there between, and follows the conveying speed of the medium 11 in the direction of arrow A', and then moves to the second binding bin. 19 is separated from the first coupling bin 18 and the idle clutch 2
0 means "no". Therefore, the first drive roller 1
2, the rear side of the medium 11 remains sandwiched between the first drive roller 12 and the first driven roller 14, and only the drive force of the second drive roller 13 moves the medium 11 toward the arrow A'.
conveyed in the direction. When the rear end of the medium 11 is conveyed in the direction of arrow A' and leaves between the first driving roller 12 and the first driven roller 14 as shown in FIG. Since there is no driving force, the medium 11 is pushed out and the medium 11 is pushed out, but the medium 11 is pushed out and the brakes are not applied.Therefore, the medium 11 can be stably conveyed without any fluctuation in the sending out of the medium 11. .・In addition, the angle θ′ formed by the first coupling pin 18 and the second coupling pin 19 at this time
is preferably 5 to 10 degrees and 8 degrees, and the value of the equation (3) or (4) is determined so that this θ' does not become too large.

Next, as shown in (d), when the rear end of the medium 11 leaves between the first driving roller 12 and the first driven roller 14, the medium 11 is moved between the second driving roller 13 and the second driven roller 14. It is held only by the driven roller 15 and conveyed in the direction of arrow A'.

At this time, the first driving roller 12 and the first driven roller 14 are in a stopped state for a while, and the first coupling bin 18 rotates due to the rotation of the transmission 4119 and is coupled with the second coupling bin 19, so that the first coupling bin 18 is rotated again. The first driving roller 12 and the first driven roller 14 start rotating.

Thereafter, when returning the medium 11 to the original input port 21 side, the rotation direction of each drive roller 12, 13 may be reversed. At this time, the connection positional relationship between the first connection pin 18 and the second connection pin 19 of the idle clutch 20 of the first drive roller 12 is opposite to that described above.

(6) Effects of the Invention Since the present invention is configured as described above, when the medium 11 is transferred from the first drive roller 12 to the second drive roller 13, the difference in circumferential speed between the two rollers 12 and 13 and the The driving force of the first drive roller 12 can be eliminated by the action of the idle clutch 200 provided at the first drive roller 12 portion.

Therefore, the brake is not applied when the medium 11 is pushed out by the first drive roller 12, and the feeding of the medium 11 does not fluctuate and can be stably conveyed. Further, as shown in FIG. 6(b), even after the leading end of the medium 11 is held between the second driving roller 13 and the second driven roller 15, the rear side of the medium 11 continues to be held between the second driving roller 13 and the second driven roller 15. Since the medium 11 is conveyed while being held between the first driving roller 12 and the first driven roller 14, it is possible to prevent the medium 11 from shaking, and for example, to eliminate misreading of the medium 11 such as a magnetic card by a magnetic head or the like. Therefore, the accuracy of reading can be improved. Furthermore, even if the medium 11 has a warp or curve 9, it is not affected by the warp as much because it is held by both the first drive roller 12 and the second drive roller 13.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional media transport device, FIG. 2 is a schematic plan view showing a media transport device according to the present invention, FIG. 3 is an explanatory diagram showing its drive system, and FIGS. 4 and 5 are A schematic plan view showing another embodiment, and FIGS. 6(a) to 6(d) are explanatory diagrams showing the operating state. 1...Rotary drive source 2.3.4.5...Pulley 6.7...Transmission belt 8.9.10...Transmission shaft 11. ...Medium 12...First drive roller 13...Second drive roller 14...First driven roller 15...Second driven roller 18...First coupling bin 19...Second coupling bin 20...Idle clutch Applicant Fujitsu Ltd. Figure 5 Figure 6

Claims (1)

[Claims] It has a first drive roller and a second drive roller which are rotated by a driving force applied from a rotational drive source via a transmission shaft, and a first driven roller and a second driven roller which are rotated by being pressed by these respective drive rollers. In the medium conveying device, the medium is held between the first driving roller and the first driven roller and conveyed to the second driving roller and the second driven roller 2 side, the first driving roller and its driving force transmission section; a clutch is provided between them, and the second drive roller is configured such that the circumferential speed in the outer circumferential direction is greater than the circumferential speed of the first drive roller,
When the conveyed medium is sandwiched between the second driving roller and the second driven roller, the clutch is disengaged due to the difference in conveying speed between the two driving rollers, and the first driving roller and the first driven roller A medium conveyance device characterized in that a groove holding a medium rotates as the medium is conveyed.