JPS60685Y2 - Sheet transport mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sheet conveyance mechanism, and particularly to a sheet conveyance mechanism that continuously conveys a sheet from one belt to another belt.

This type of sheet transport mechanism is used, for example, in optical character reading devices.

FIG. 1 is a diagram illustrating a sheet conveying mechanism conventionally used in an optical character reading device. In the figure, the sheets a to bird are hung on rollers arranged at both ends, and the rollers are rotated in the direction of arrow A. The belts P1 to P5 running on the belts B1 to B1. A pinch roller rotates when pressed against B2, 1 is a sheet, 10 is a light source, 15 is a photodetector, 20 is a solenoid motor, PA
is a movable pinch roller which is driven by the solenoid motor 20 to move up and down as shown by arrows U and D, and which may or may not come into contact with the "C" belt. 3.degree. is a reading device.

Now, when the sheet 1 is inserted between the belt a and the pinch roller P1, the belt B1 transfers the sheet 1 to the reading device 30.
carry it to a position directly facing the

A reference mark is recorded on the sheet 1 in advance together with characters, and when this reference mark is detected by a detector (not shown), the driving force supplied to the belt B is cut off and at the same time the brake is applied to stop it. It has become.

As a result, the characters in the first row on the sheet 1 are positioned with respect to the reading device, and the characters are read by the reading device.

Thereafter, the belt moves by the width of one line and then stops, and reading is performed while the belt is stopped.

On the other hand, while the belt B1 runs intermittently as described above, the belt bird runs in the same direction but at a steady speed.

This is because, in order to cause the belt B1 and the belt bird to travel synchronously, the inertial force of the belt B2 also acts, making the braking device expensive and difficult to control.

Therefore, as shown in the figure, when the sheet 1 straddles both the belts B1 and 9, the solenoid is activated by the output of the photodetector 1.
By activating the motor and displacing the movable pinch roller PA upward, the end of the sheet 1 on the belt bird side is brought into contact with the belt B2 only by its own weight.

Then, the frictional force that the seat 1 receives from the belt B2 is extremely small compared to the frictional force of the belt B□, and therefore,
The sheet 1 slides against the belt bird and is conveyed as the belt B□ runs.

Furthermore, when the sheet 1 is completely moved to the belt 6 side, the movable pinch roller PA descends and moves the sheet 1 to the belt B2.
The sheet 1 can be reliably conveyed as the belt B2 runs.

However, in this conventional mechanism, the light source 10,
It is expensive because it requires parts such as the photodetector 15 and the solenoid motor 20, and the movable pinch roller PA
It is not easy to install or adjust the rollers, and furthermore, the rollers themselves are not that cheap.

Thus, an object of the present invention is to provide a sheet conveying mechanism that is inexpensive and has a structure that is easy to install and adjust. A conveyance mechanism that has two endless belts and continuously conveys sheets from one belt to the other belt, the conveyor mechanism includes a pinch roller that rotates in pressure contact with the first belt, and a pinch roller that is open at least at the bottom. a holding member provided with an air slide and disposed above the second belt through a small gap; and a sphere rotatably housed in the air slide and in contact with the second belt with its own weight; - Although it is distantly related by making the pressure contact force of the roller larger than the pressure contact force of the sphere, one embodiment thereof will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing a sheet conveying mechanism that is an embodiment of the present invention, and shows the structure and operation of belt a side, and belt B side.
The structure and operation of 2 itself are the same as those shown in FIG.

The differences are the holding member 100 and the air sliding 10 of the holding member 100.
1 to 104 are provided.

That is, the holding member 100 is disposed above the belt B2 with a small gap somewhat wider than the thickness of the sheet 1 interposed therebetween.

Moreover, box-shaped air slides 101 to 104, which are partially open, are formed in the lower part (lower surface part) of the holding member 100.

Further, spheres 111 to 114 are rotatably accommodated in these air slides 101 to 104, and the spheres 111 to 1
A portion of the belt 14 is exposed through the opening and comes into contact with the belt B2 due to its own weight.

In other words, these spheres can be freely displaced up and down to some extent.

Because of this structure, the spheres 111 to 114 may be made lighter or their number reduced.
-114 to the belt B2 can be made smaller than the pinch roller P.

That is, it is easy to adjust the pressure contact force, and the pressure contact force does not change over time and always remains at a constant value.

Now, by adjusting the pressing force in this way, when the sheet 1 straddles both the belts A and B2, the sheet 1 is strongly pressed against the belt B by the pinch roller P.

That is, due to this difference in pressure contact force, when the seat 1 extends over both belts, the seat 1 is intermittently driven by the first belt.

Therefore, the sheet 1 is conveyed as the belt B1 runs.

Immediately after the sheet 1 leaves the pinch roller P, it begins to be conveyed as the belt B2 runs.

In this manner, the sheet conveyance mechanism shown in FIG. 2 performs sheet conveyance similar to the mechanism shown in FIG. 1.

For example, even if the running directions of belt B1 and belt B2 are different, the spheres 111 to 114 can rotate completely freely, so that the sheet 1 can be kept flat without being bent or damaged. The sheet can be transferred from the belt B1 to the belt B2 up to the point where the sheet can be transferred from the belt B1 to the belt B2.

This would be difficult if rollers were used while still in contact with the sheet.

In addition, air slides 101 to 104 formed on the holding member 100
Since the accuracy of the holding member does not need to be very high, manufacturing of the holding member is easy and inexpensive.

In addition, the openings of the air slides 101 to 104 are set to the spheres 111 to 114.
If the diameter is smaller than , the spheres 111 to 114 will not come off when the holding member 100 is separated from the belt B2, and on the contrary, it will be easier to attach them, which is advantageous.

Further, the air slides 101 to 104 are not limited to a size that accommodates one sphere per chamber, but may be elongated to accommodate a plurality of spheres at the same time.

The shape is not limited to a box shape, but may be any bag shape, or may have openings at multiple locations so as to penetrate through the holding member, or may have adjacent air slides communicating with each other.

As described above, according to the present invention, it is possible to provide a sheet conveying mechanism that is less expensive than ever before and is easy to assemble and adjust.
In addition, due to the difference in pressure between the pinch roller and the sphere, the sheet can be conveyed normally without any problems such as sagging, even when the sheet is on both belts. has.

[Brief explanation of the drawing]

FIG. 1 illustrates a conventional sheet conveyance mechanism, and FIG. 2 illustrates a sheet conveyance mechanism of the present invention. B□, B2...Belt, P□~P,...
・Pinch roller, 100... Holding member, 101
~104・Song・Room chamber, 111~114・・・・・Sphere, 1・・Song sheet.

Claims (1)

[Scope of utility model registration request] In a system that includes a first belt that is arranged in series and is driven intermittently and a second belt that is driven to rotate continuously, the system conveys a sheet across both belts by running both belts,
a pinch roller rotating in pressure contact with the first belt; a holding member having at least a closed chamber in its lower part and disposed above the second belt with a small distance therebetween;
A sheet conveyance mechanism characterized in that a spherical body is rotatably housed in the chamber and contacts the second belt by its own weight, and the pressure contact force of the pinch roller is increased by the pressure contact force of the spherical body.