JPH0544951U - Medium ejection mechanism - Google Patents

Abstract

(57) [Summary] [Objective] In a mechanism for ejecting a medium by two rollers that are in pressure contact with each other, a one-way bearing is not required by providing a member that prevents the ejected medium from running backward. [Structure] Roller collar 2 that is pressed against pressure roller 5
A sheet stopper 29 is provided so as to cover 6. The tip portion 29a of the sheet stopper 29 is pressed against the lower surface of the extension portion 24 of the upper sheet guide 21. The pressure roller 5 passes through the opening 30 of the sheet stopper 29, and the roller collar 26
Press against. The sheet stopper 29 is pushed down by the discharged medium 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a medium ejecting mechanism used in a ticket issuing device, a printer or the like for accumulating and ejecting a medium on a stacker, and in particular, an ejecting mechanism having a function of preventing the once ejected medium from being fed back to a conveyance path again. Regarding

[0002]

[Prior Art]

 FIG. 6 is a cutaway perspective view showing a conventional medium ejection mechanism. In the figure, the sheet guide 1 forms a traveling path of the medium 2, and the end portion of the sheet guide 1 is bent downward. A feed shaft 3 is rotatably arranged inside the bent portion 1 a of the sheet guide 1, and a feed roller 4 is attached to the feed shaft 3. The feed roller 4 is exposed from the opening 1b of the sheet guide 1 to the outside and is in pressure contact with the pressure roller 5. The medium 2 is discharged onto the stacker 6 by the feed roller 4 and the pressure roller 5.

The feed shaft 3 is rotatably supported by a side frame 10 via bearings 9, and bearings 9 on both sides are fitted with one-way bearings 11 and 12, respectively. A pulley 13 is attached to one one-way bearing 11, and a belt 14 is wound around the pulley 13.

Although the belt 14 is driven by a motor (not shown), the belt 14 rotates in both directions due to the common drive source in the apparatus. Therefore, by providing the one-way bearing 11, the feed shaft 3 is rotated only in the arrow A direction.

Next, the operation will be described. When a motor (not shown) is rotated and the belt 14 is moved in the arrow B direction, the feed shaft 3 rotates in the arrow A direction. As a result, the feed roller 4 and the pressure roller 5 rotate, and the medium 3 conveyed in the direction of arrow C is discharged onto the stacker 6 in a piled state.

When the belt 14 rotates in the direction opposite to the arrow B, that is, when the belt 14 spins, the internal frictional resistance of the one-way bearing 11 may cause the feed shaft 3 to rotate in the direction opposite to the arrow A. The one-way bearing 12 is provided to prevent rotation in the opposite direction. That is, if the feed roller 4 rotates in the reverse direction (reverse rotation of the arrow A), the discharged and accumulated medium 3 may run in the reverse direction again on the traveling path, which is prevented. The one-way bearing 12 is fixed to the frame 10 by a boss 15.

[0007]

[Problems to be solved by the device]

 However, the above-described conventional mechanism for preventing the reverse rotation of the feed roller to prevent the reverse direction of the discharge medium has the following problems. That is, 1. Since two one-way bearings are used, the manufacturing cost of the device increases.

2. The boss 15 is required to fix the one-way bearing 12 to the frame 10, which increases the manufacturing cost of the device.

3. Providing the one-way bearing 12 requires quenching and oiling of the feed shaft 3 to be inserted therein, which complicates the manufacturing process of the device.

[0010] 4. Since the feed roller 4 rotates in one direction, it is difficult to remove the jammed medium between the feed roller 4 and the pressure roller 5 depending on the state of the jam.

The present invention has been made in view of the above problems, and an object thereof is to provide a stopper for preventing the discharge medium from running backward, thereby eliminating the need for a one-way bearing, thereby reducing the manufacturing cost of the device. It is to provide an excellent medium discharging mechanism.

[0012]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a sheet guide having an extension portion which forms one side running surface of a medium and extends in a discharge direction from a discharge roller or a pressure roller for discharging the medium, and a medium of the sheet guide extension portion. It is provided with a seat stopper that presses against the running side.

[0013]

[Action]

 The medium is conveyed in the ejection direction by the ejection roller and the pressing roller. When the leading edge of the medium reaches the pressure contact portion between the sheet stopper and the extension portion of the sheet guide, the sheet conveying force of the medium causes the sheet stopper to separate from the extension portion, so that the medium can pass through and is ejected to the ejection portion. After the media has passed through, the sheet stopper presses against the extension again.

Since the sheet stopper is in pressure contact with the extension portion, the ejected medium does not reach the pressure contact portion between the ejection roller and the pressing roller, and therefore does not travel backward to the traveling path.

By using the sheet stopper as described above, the backward running of the medium can be prevented, and thus the one-way bearing becomes unnecessary.

[0016]

【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 cutaway perspective view showing a first embodiment according to the present invention, and FIG. 2 is a sectional view taken along the line DD of FIG. 1. First, the first embodiment will be described.

In FIG. 1, in the medium ejecting mechanism according to the first embodiment, the upper sheet guide 21 and the lower sheet guide 22 form a traveling path of the medium 2. The upper sheet guide 21 is formed with a notch 23, and the pressure roller 5 is arranged therein. The upper sheet guide 21 is also formed with an extension 24 projecting in the medium discharge direction, and the extension 24 projects under the shaft 5a of the pressure roller 5. An opening 25 is formed in the lower sheet guide 22 as in the conventional example, and the feed roller 4 is arranged therein. The feed roller 4 is attached to the feed shaft 3, and a roller collar 26 having a smaller diameter than the feed roller 4 is fitted between the two feed rollers 4. When the feed shaft 3 rotates, both the feed roller 4 and the roller collar 26 rotate at the same time. Bearings 27 and 28 are fitted into both ends of the feed shaft 3, and the feed shaft 3 is fixed to the side frame 10 via the bearings 27 and 28.

As shown in FIG. 2, a sheet stopper 29 is fixed to the lower surface of the lower sheet guide 22. The sheet stopper 29 is formed of an elastic member, is arranged in the opening 25 of the lower guide 22, and has a shape covering the roller collar 26. Is in pressure contact with the lower surface of the extension 24. An opening 30 is formed in the sheet stopper 29, and the pressure roller 5 is pressed against the roller collar 26 through the opening 30.

A pulley 5 is attached to the bearing 28 as in the conventional example, and a belt 14 is wound around the pulley 5. Although the belt 14 is driven by a motor (not shown), this motor rotates in both directions due to the shared driving source in the apparatus, and therefore the belt 14 also rotates in both directions.

Next, the medium ejection operation in the first embodiment will be described. When the belt 14 rotates in the arrow B direction shown in FIG. 1 by a motor (not shown), the feed shaft 3 rotates in the arrow A direction via the pulley 5 and the bearing 28. The medium 2 is conveyed on the lower sheet guide 22 and the sheet stopper 29 by a conveying roller (not shown), and the leading end of the medium 2 abuts between the pressure roller 5 and the sheet stopper 29 and is further conveyed. The leading end pushes down the sheet stopper 29. A portion of the medium 2 that moves on the opening 30 of the sheet stopper 29 enters the opening 30, and is conveyed while being sandwiched between the pressure roller 5 and the roller collar 26. When the sheet stopper 29 is pushed down, its tip portion 29a is separated from the extended portion 24 of the upper sheet guide 21 to allow the medium 2 to pass therethrough, and the medium 2 is dropped onto the stacker 6 by the pressure roller 5 and the roller collar 26. ..

When a large amount of the discharge medium 2 is accumulated on the stacker 6, reaches near the pressure contact portion between the pressure roller 5 and the roller collar 26, and the belt 14 rotates in the direction opposite to the arrow B, the upper sheet guide 21 is extended. Since the portion 26 and the sheet stopper 29 are in pressure contact with each other, the medium 2 cannot enter the pressure contact portion between the pressure roller 5 and the roller collar 26, so that the medium 2 is not reversely run.

FIG. 3 is a sectional view showing a second embodiment according to the present invention. Next, the second embodiment will be described.

In FIG. 3, in the second embodiment according to the present invention, a seat stopper 41 is rotatably attached to the lower seat guide 22, and a rear end portion 41a thereof is urged downward by a spring 42. Due to the urging force of the spring, the sharp end portion 41b of the seat stopper 41 is pressed against the lower surface of the extension portion 24 of the upper seat guide 21. The pressure contact force is set so that it is pushed down by the discharged medium 2 as in the first embodiment. The other structure is similar to that of the first embodiment. Even with this configuration, it is possible to prevent the discharge medium 2 from running backward. In the second embodiment, the material of the sheet stopper 41 does not necessarily have elasticity and the material selection becomes easy.

FIG. 4 is a cutaway perspective view showing a third embodiment according to the present invention, and FIG. 5 is a sectional view showing the third embodiment. Next, the third embodiment will be described.

4 and 5, in the third embodiment of the present invention, the sheet stopper 51 is rotatably attached to the shaft 52. The shaft 52 is rotatably driven by the belt 14 shown in FIG. 4, and the conveying roller 53 is attached as shown in FIG. The transport roller 53 transports the medium 2 together with the pressure roller 54 shown in FIG.

The shaft 52 is fixed to the side frame 10 by a bearing 55. The seat stopper 51 is pressed against the friction plate 56 fitted into the shaft 52 by the spring 57, and is rotated by the rotation of the shaft 52 due to the friction generated between the seat stopper 51 and the friction plate 56. The other structure is the same as that of the first embodiment.

In the third embodiment configured as described above, when the transport roller 53 rotates in the direction of arrow E shown in FIG. 5 in order to run the medium 2, the sheet stopper 51 also moves in the same direction as the rotation. Rotate. As a result, the tip 51a of the sheet stopper 51 separates from the lower surface of the extension 24 of the upper sheet guide 21, and the medium 2 is easily ejected. On the contrary, when the shaft 52 is rotated in the opposite direction of the arrow E by the motor (not shown), the seat stopper 51 is also rotated in the same direction, and the pointed portion 51a and the extension portion 24 of the upper seat guide 21 are pressed against each other. .. As a result, even if the ejected medium 2 is accumulated on the stacker 6, the medium 2 cannot pass through between the pointed portion 51a and the extension portion 24, and therefore is not run backward.

[0029]

[Effect of the device]

 As described above in detail, according to the present invention, since the sheet stopper for preventing the backward traveling of the discharge medium is provided, the following effects are achieved. That is, 1. It is possible to prevent the medium accumulated on the stacker from running backward.

2. Costs can be reduced because one-way bearings are not required.

3. Also, since the one-way bearing is unnecessary, the boss for fixing the one-way bearing to the frame is unnecessary. In addition, quenching of the shaft and caution are unnecessary. In addition, the hardness of the shaft can be lower than when using a one-way bearing.

4. The feed roller can be rotated in both directions, making it easier to remove jammed media.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing a first embodiment according to the present invention.

FIG. 2 is a sectional view taken along line DD of FIG.

FIG. 3 is a sectional view showing a second embodiment according to the present invention.

FIG. 4 is a cutaway perspective view showing a third embodiment according to the present invention.

FIG. 5 is a sectional view showing a third embodiment.

FIG. 6 is a cutaway perspective view showing a conventional medium ejection mechanism.

[Explanation of symbols]

 2 medium 4 feed roller 5 pressure roller 21 upper sheet guide 22 lower sheet guide 24 extension 26 roller color 29, 41, 51 sheet stopper 53 transport roller

Claims (2)

[Scope of utility model registration request] 1. A medium discharging mechanism for depositing a medium on a discharging portion by a discharging roller and a pressing roller pressed against the discharging roller, wherein a one-side running surface of the medium is formed and an extension extending in the discharging direction from the discharging roller or the pressing roller A medium ejecting mechanism, comprising: a sheet guide having a portion; and a sheet stopper that comes into pressure contact with a medium running side of the sheet guide extension portion. 2. A medium discharging mechanism for accumulating a medium conveyed by a conveying roller on a discharging portion by a discharging roller and a pressing roller pressed against the discharging roller, wherein one side running surface of the medium is formed, and the discharging roller or the pressing roller A sheet guide having an extension portion extending in the discharge direction, mounted coaxially with the conveyance roller, pressed against the medium running side of the sheet guide extension portion, and rotating the conveyance roller in the medium discharge direction to extend the sheet guide. A medium ejecting mechanism, which is provided with a sheet stopper that is separated from the section.