JP2545089Y2 - Media transfer device with flat belt and roller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium conveying apparatus for conveying a thin plate-like medium such as paper sheets and cards, and more particularly to a medium conveying apparatus using a flat belt and rollers.

[0002]

2. Description of the Related Art Conventionally, in order to prevent a flat belt from coming off, a flat belt is wound around a drum-shaped pulley (crown pulley) having a middle surface. As shown in FIG. 7, when the flat belt 1 is subdivided in the width direction, the force applied to each of the divided belts acts in a direction perpendicular to the pulley shaft 2 when the flat belt 1 is subdivided in the width direction as shown in FIG. (Vector a). This force is used for crown pulley 3
And a force in the direction perpendicular to the surface (vector b) and a force in the direction horizontal (vector c) as a component force. The force in the direction perpendicular to the surface (vector b) acts as tension applied to the crown pulley 3. However, the horizontal force (vector c) acts toward the crown pulley 3 apex. The taper increases as the distance from the ends of the crown pulley 3 increases, so that the horizontal force (vector c) also increases. As a result, if the flat belt 1 is shifted downward by, for example, one division in FIG. 7, the taper of the crown pulley 3 on the shifted side is further increased, so that the horizontal force (vector c) acts upward toward the vertex. On the other side, the largest horizontal component (vector c) disappears, so that the difference between the two vectors causes the flat belt 1 to return to the original center position.

Therefore, in order to transport a thin plate-like medium such as a paper sheet or a card with the flat belt 1 and the roller opposed thereto, as shown in FIG. Roller 4 at the position where flat belt 1 contacts
In this case, the flat belt 1 and the roller 4 are in point contact with each other at the vertex position d of the crown pulley 3, and therefore, as shown in FIG. The position is fixed at a position slightly inward from the position where the flat belt 1 comes into contact, and the flat belt 1 is provided in a pressed state.

[0004]

However, according to the above structure, the gripping force of the flat belt 1 and the rollers 4 and 4 depends on the tension of the flat belt 1, and the flat belt 1 is stretched due to aging. Problems such as reduced grip force and slippage have occurred.

The roller 4 is located at a position where the flat belt 1 and the crown pulley 3 come into contact with each other as described above.
When the roller 4 is pressed against the flat belt 1 by using a spring force, the roller 4 having a cylindrical peripheral surface and the crown pulley 3 having a middle height come into contact with the flat belt 1 as described above. Therefore, only one point of the flat belt 1 is pressed, and the load is concentrated on one point. Therefore, when the roller 4 is accurately supported in a horizontal state, the load is applied to the apex of the crown pulley 3 so that the crown 4 is stable. The flat belt 1 moves to the inclined side, and the horizontal portion parallel to the peripheral surface of the roller 4 acts on the side opposite to the inclined side of the roller 4 by the action of the crown pulley. Since the horizontal component of this load is extremely large compared to the force that the crown pulley 3 tries to return, the flat belt 1 continues to move to the side where the horizontal component acts, and finally comes off the crown pulley 3. Would be. When the position where the flat belt 1 contacts the crown pulley 3 is pressed by a roller having a cylindrical peripheral surface as described above, there is a problem that the flat belt 1 is extremely unstable.

In view of the foregoing, the present invention has been made in view of the above, and is capable of always nipping and transporting a medium with a stable gripping force without depending on the tension of the flat belt, and a medium transport apparatus in which the flat belt does not come off from the crown pulley. The purpose of this is to provide.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, according to the present invention, an endless flat belt is wound between crown pulleys, and a roller is installed facing the surface of the flat belt. A conveying device for nipping and conveying the medium between the flat belt and the roller, wherein the roller is pressed against and supported by a resilient body at a position where the flat belt is in contact with the crown pulley, and a central area in the circumferential surface width direction of the roller is provided. A concave groove that is concave in the circumferential direction.

[0008]

Since the roller is supported by the elastic body at the position where the flat belt contacts the crown pulley, the holding force of the medium by the flat belt and the roller is guaranteed by the pressing force of the elastic body, and is always constant. Will be kept. In addition, since the roller has a concave groove on the peripheral surface in the central region in the axial direction, the central region of the roller does not come into contact with the flat belt and the crown effect is not lost.

When the width of the groove is smaller than the width of the flat belt, the roller and the flat belt are in two-point contact with each other, and the left and right horizontal component forces are balanced and stabilized. If the flat belt moves to one side and comes off, the roller contacts only on the moved side and the other side becomes free, so a horizontal component acts in the direction to return the flat belt to the center, and the flat belt Is restored.

If the width of the groove is wider than the width of the flat belt, the roller does not normally come into contact with the flat belt, is not pressed by the roller, and is flattened by the crown effect of the crown pulley. The belt stabilizes. If the flat belt moves to one side and comes off, the roller contacts only on the moved side, and the other side is free, so a horizontal component force acts to return the flat belt to the center. Is returned to.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention; FIG.

FIG. 1 shows a side view of one embodiment of the present invention. A flat belt 1 is wound between crown pulleys 3 and 3 arranged in parallel at a required interval.
Rollers 5 and 5 are resiliently pressed in a region where they come into contact with the crown pulleys 3 and 3. In the illustrated example, the support means for the rollers 5 and 5 is provided at one end thereof with a fixing member (not shown).
Rollers 5, 5 are attached to the tips of the support members 7, 7 pivotally supported by
A compression spring 9, 9 is interposed between the support members 7, 7 and the fixed members 8, 8 to urge the rollers 5, 5 toward the flat belts 1, 1 with a predetermined force. doing.

The rollers 5 in the present invention have a concave groove 10 which is concave in the circumferential direction on the peripheral surface in the central region in the axial direction. If a narrow width L ₁ than the width L of the width of the groove 10 is flat belt 1 (Fig. 2), and a case where the width L ₂ than the width L of the flat belt 1 (Fig. 4) .

When the groove 10 has a narrow width L ₁ as shown in FIG. 2, the peripheral surfaces of the protruding edges 11 on both sides of the groove 10 of the roller 5 are brought into contact with both sides of the surface of the flat belt 1. , This protruding edge 1
A transported medium 12 such as paper sheets, various sheets, and cards is sandwiched and transported between the peripheral surfaces of the flat belts 1 and 11 and the flat belt 1.

In this embodiment, the roller 5 comes into contact with the flat belt 1 at two points in the width direction, and the left and right horizontal component forces of the protruding edges 11, 11 are balanced and stabilized. When the flat belt 1 moves to one side and is likely to come off the crown pulley 3, one protruding edge 11 comes off the flat belt 1 and only the other protruding edge 11 comes into contact with the flat belt 1 as shown in FIG. So
The horizontal component force due to the contacting edge 11 is the flat belt 1.
And the flat belt 1 is returned to the center position of the crown pulley 3 again.

When the groove 10 has a wide width L ₂ shown in FIG.
The flat belt 1 comes to fit in the concave groove 10 of the roller 5,
When the medium 12 is transported, as shown in FIG.
1 and 11 are conveyed.

In this embodiment, the roller 5 does not normally contact the flat belt 1 as shown in FIG. 4, and the flat belt 1 is positioned at the center by the crown effect of the crown pulley 3. When the flat belt 1 moves to one side and comes off,
As shown in FIG. 6, the protruding edge 11 on the side of the flat belt 1 comes into contact with the surface of the flat belt 1, and a horizontal component acts in the direction of returning the flat belt 1 in the same manner as in the above-described embodiment, so that the flat belt 1 Is returned to the position.

Therefore, in any of the above-described embodiments, the crown pulley 3 is driven independently of the tension of the flat belt 1.
, The medium can be pinched and conveyed with a constant pressing force, and the function of automatically correcting the deviation of the flat belt 1 is performed.

[0019]

As described above, according to the present invention, it is possible to pinch and convey a medium by mounting a roller in an area where the flat belt contacts the crown pulley, so that it is necessary to rely on the tension of the flat belt. Therefore, the medium can be always conveyed with a stable gripping force. Further, when the flat belt is displaced from the crown pulley and comes off, the roller performs an operation of returning to the center position, so that the flat belt does not come off and the maintainability of the transport device can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a medium transport device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a cross-sectional view showing a state in which a flat belt is detached in FIG. 2;

FIG. 4 is a view corresponding to FIG. 2, showing another embodiment of the roller;

FIG. 5 is a cross-sectional view showing the same medium transport state.

FIG. 6 is a cross-sectional view of FIG. 4 in a state in which the flat belt has come off;

FIG. 7 is an explanatory view showing a crown effect by a crown pulley.

FIG. 8 is a side view showing a conventional medium transport device using flat belts and rollers.

FIG. 9 is a diagram illustrating the operation of a crown pulley.

FIG. 10 is a diagram illustrating the operation of a crown pulley.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat belt 3 Crown pulley 5 Roller 7 Support member 10 Concave groove 11 Ridge 12 Medium

Claims (3)

(57) [Scope of request for utility model registration] An endless flat belt is wound between crown pulleys, and a roller is provided opposite to the surface of the flat belt so that a medium is sandwiched and transported between the flat belt and the roller. The flat belt and the roller are characterized in that the flat belt is pressed against and supported by an elastic body at a position where the flat belt is in contact with the crown pulley, and a concave groove is formed in the central region in the circumferential direction of the circumferential surface of the roller so as to be concave in the circumferential direction. Media transport device. 2. The medium transport apparatus according to claim 1, wherein the width of the concave groove of the roller is smaller than the width of the flat belt. 3. The medium conveying apparatus according to claim 1, wherein the width of the concave groove of the roller is wider than the width of the flat belt.