JPH01288062A - Original reader - Google Patents

Abstract

PURPOSE:To prevent deterioration in the performance of an original read section by arranging a torque delivery member within a plane in parallel with the moving plane of an original read section and delivering a motor torque to the torque delivering member by a couple of drive pulleys. CONSTITUTION:A motor pulley 10 is driven horizontally in a direction of arrow C, the torque is delivered to two drive pulleys 5 by one belt 12 and an original read section 1 coupled by a wire 4 is retracted. The two drive pulleys 5, 5 are driven in the same direction, the coupling part 13 of the wire 4 in the original read section 1 is arranged to the end with respect to the right side wire 4 and arranged inward from the end with respect to the left wire 4 to give a torque in the same direction to both ends from the wire 4 with respect to the original read section 1. Thus, the entire reader is made small in size and the delivery of the torque with high accuracy is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document reading device, and particularly to a mechanism for driving a document reading section.

[Conventional technology]

FIG. 7 is a perspective view of a main part of a drive system of a conventional document reading device disclosed in, for example, Japanese Utility Model Application Publication No. 62-75675.

In the figure, 1 is a document reading section, 2 is a line sensor arranged in a row in the main scanning direction shown by arrow A in the document reading section 1;
3 is a guide shaft for positioning the document reading section 1 in the main scanning direction A and sliding it in the sub-scanning direction shown by arrow B; 4 is a wire for pulling the document reading section 1 in the sub-scanning direction B; 5 6 is a drive pulley for transmitting traction force to the wire 4, and 6 is an idle pulley paired with the drive pulley 5.
7 is an m-movement shaft that drives drive pulleys attached to both ends; 8 is a relay pulley attached to the drive shaft 7;
9 is a belt that transmits driving force to the relay pulley 8; 10 is a motor pulley that transmits the driving force of a pulse motor 11 serving as a power source to the relay pulley 8 via the belt 9.

In this conventional device, the original reading unit 1 reads a horizontal downward facing original (not shown);
The line sensor 2 has a length almost equal to the width of the document.

An apparatus having such a reading section is called a 1-magnification type when classified based on its optical system, and performs a reading operation by sequentially repeating the reading operation in the main scanning direction while moving the document reading section 1 in the sub-scanning direction B.

In this case, the motor pulley 10 of the pulse motor 11 is
When the belt rotates in the direction of , the driving force is transmitted to the relay pulley 8 via the belt 9 . The driving force is transmitted to the drive pulley 5 via the drive shaft 7 which is coupled to the relay boo 98,
These are rotated in the same direction as the motor pulley lO. This rotational force is transmitted to the wire 4 wound around the drive pulley 5 and stretched between the opposing idle pulley 6, and further moves the document reading section 1 coupled to the wire 4 in the sub-scanning direction B. Such a reading operation in the sub-scanning direction B is performed from a reading start position at one end of the document to an end position at the other end. When the reading of the original is finished, the pulse motor 11
The shaft rotates in the opposite direction, and the document reading section 1 is returned to the starting position.

[Problem to be solved by the invention]

In this conventional device, the axes of the drive shaft 7 that connects the relay pulley 8 and the drive pulley 5 and the idle pulley 6 are horizontal, so the wire 4 stretched between the drive pulley 5 and the idle pulley 6 is vertically This resulted in two wires, and the space factor was poor because the space where the wires were stretched could not be used.

Furthermore, in the system in which the driving force generated by the pulse motor 11 is transmitted to the drive pulley 5, the presence of the relay pulley 8 prevents backlash between the relay pulley 8 and the belt 9 and coupling of the relay pulley 8 to the drive pulley 5. There is a problem that the driving force of the pulse motor 11 is not effectively transmitted to the drive pulley 5 due to the possibility of looseness in the structure.

The present invention has been made to solve these problems, and an object of the present invention is to provide a document reading device that can realize miniaturization of the entire device and highly accurate transmission of driving force.

[Means to solve the problem]

The document reading device according to the invention of B has endless driving force transmitting members attached to both ends of the document reading section so as to move the document reading section forward and backward, and the driving force transmitting members are arranged parallel to the moving surface of the document reading section. This driving force transmission member is driven by a pair of drive pulleys having rotational axes perpendicular to the plane of movement of the document reading section, and the pair of drive pulleys are driven by a motor to move the document reading section. The driving force is driven by another driving force transmitting member arranged endlessly in a plane parallel to the plane.

[Effect]

Since the driving force transmission member in this invention is arranged on the inner surface parallel to the moving surface of the document reading section, it is possible to effectively utilize the space in the direction perpendicular to the moving surface of the document reading section, and the driving force of the motor is Since the information is effectively transmitted to the pulley and the document reading unit connected thereto, it is possible to prevent the deterioration of the document reading performance, thereby realizing miniaturization and high performance of the device.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. That is, in FIGS. 1 to 3, 12 is stretched over a plane parallel to the plane of movement of the document reading section 1 in the sub-scanning direction;
a belt for transmitting the wAwIJ force between the motor pulley 10 and the drive pulley 5, the rotational axis of which is arranged perpendicular to the movement plane in the sub-scanning direction B; 13, a coupling portion for coupling the document reading section 1 to the wire 4; 14; is the casing. The rest of the configuration is the same as the conventional one shown in FIG. 7, so the explanation will be omitted.

With this configuration, the rotation axes of the pulse motor 11, the drive pulley lO, and the idle pulley 6 are perpendicular to the movement plane in the sub-scanning direction B, and the drive pulley 5 receives the drive from the motor 11. A belt 12 that receives the force and a wire 4 that transmits the driving force to the document reading section 1 are wound around the belt 12 .

Therefore, the motor pulley 10 rotates horizontally in the direction of arrow C, and this driving force is transmitted to the two drive pulleys 5 by one belt 12, and the document reading unit 1 connected to the wire 4
is towed. Here, the two driving pulleys 5.5 rotate in the same direction, but as shown in FIG. By arranging the wire 4 on the left side inside the end, driving force in the same direction is applied to the document reading section 1 from the wire 4 to both ends.

Since each drive pulley 5 is configured to rotate in a horizontal plane in this way, the space inside the device can be used effectively.

That is, as is clear from FIG. 2, the upper part of the idle pulley 6 can be set at the starting position Fn of the sub-scanning of the document reading section 1 (indicated by the - dotted chain line) or at the final position.

In FIG. 2, the coupling section 13 of the document reading section 1 is provided on the right side of the document reading section 1, but if it is provided on the left side, the final position of the reading section 1 can be set above the [1 pulley 5].

Also, the wire 4 between the drive pulley 5 and the idle pulley 6
The lower space can be used to install components other than the drive system, such as a circuit board.

Further, since the belt 12 and the wire 4 are wound around the drive boob 95 at the same time, the 'ltA power of the motor 11 can be directly and effectively transmitted to the document reading section 1 with only one relay.

Furthermore, motor pulley 1G and two drive pulleys 5゜5 are 1
Almost the same force is transmitted to each drive pulley 5 since they are connected by a real belt 12.

In this embodiment, the drive pulley 5 has the same diameter at the portion where the wire 4 and the belt 12 are connected.
The diameters of the portions where the wire 4 and the belt 12 engage may be made different as shown in FIG.

Furthermore, in the above embodiment, the motor pulley lO and the drive pulley 5
Although the belt 12 that connects the belts 12 to 12 is shown with no tension applied thereto, backlash and belt vibration can be suppressed by applying tension to the belt 12 using a tension pulley 15 as shown in FIG. can.

Furthermore, in the above embodiment, an example was shown in which two wires 4 were used between the drive pulley 5 and the idler pulley 6, but the sixth
As shown in the figure, one wire 4 may be configured to cross each other to move the document reading section 1.

Further, in the above embodiment, the case where the wire 4 and the belt 12 are used has been described, but the invention is not limited to this, and it is possible to use the opposite of each other, and furthermore, other power transmission members may be used. Not even.

Further, in the above embodiments, the case of a document reading device having a same-magnification optical system has been described, but the present invention may be applied to a device using a reduction optical system, and the present invention can be applied to a device having a similar drive system.

〔Effect of the invention〕

As described above, in the document reading device according to the present invention, the driving force transmitting member is arranged in a plane parallel to the moving surface of the document reading section, so that the entire device can be made compact, and the driving force of the motor is transferred to the pair of drive pulleys. Since the driving force is effectively transmitted by the driving force transmitting member, deterioration of the performance of the document reading section can be prevented.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
2 is a side sectional view, FIG. 3 is an enlarged perspective view of the main part, and FIGS. 4 to 6 are views showing other embodiments of the present invention, and FIG. 4 is a main part. 5 and 6 are top views of essential parts, and FIG. 7 is a perspective view of a conventional document reading device of this type. In the figure, 1 is a document reading unit, 4 is a wire, 5 is a drive pulley,
IQ is a motor pulley, 11 is a pulse motor, and 12 is a belt. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A document reading unit mounted so as to be able to move forward and backward, and drives attached to both ends of the document reading unit and arranged in an endless manner in a plane parallel to the plane of movement of the document reading unit to move the document reading unit forward and backward. a force transmitting member; a pair of drive pulleys arranged to transmit driving force to the driving force transmitting member and having a rotation axis perpendicular to the moving plane of the document reading unit; and transmitting the driving force from the motor to each of these drive pulleys. A document reading device comprising another driving force transmitting member arranged endlessly in a plane parallel to a moving surface of the document reading section.