JPH10107954A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep stable quality for assembling and adjustment by turning a pulley at a stationary side by a prescribed angle, or by providing a screw mount part at a plurality of different positions to an adjustment side pulley and providing a plurality of grooves to which a ball caulked to a wire of the pulley is inserted. SOLUTION: A stationary side pulley 2 is turned by 90 deg., or a screw mount at a plurality of different positions is provided to an adjustment side pulley 3 so as to change a tightening position of a screw. Or the pulley 3 at the adjustment side is tightened to a shaft 1 by a screw at a different position while avoiding a preceding tightening trace. That is, the pulley 3 is provided with a 1st cylindrical hollow part to which the shaft 1 is inserted and with a plurality of 2nd cylindrical hollow parts leading from the 1st cylindrical hollow part toward an outer circumferential part, screws 9 or pins whose number is smaller than number of the 2nd cylindrical hollow parts are inserted to the 2nd cylindrical hollow parts to fix the pulley 3 to the shaft 1 so as to prevent occurrence of defective assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of wires having a ball which is caulked in the middle and for attaching an optical system, a shaft, a groove for fitting the ball, and a pair of fixing portions for the shaft. And an image reading apparatus that reads an image by scanning an optical system by winding a wire around the pair of pulleys fixed to the shaft and scanning the optical system.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing the outline of the configuration of an image reading device, FIG. 4 is a diagram for explaining the assembly adjustment of the image reading device, and FIG. 5 is a diagram for explaining the bending of an image read by the image reading device. FIG. As shown in FIG. 3, a first mirror carriage 2 holding an optical system via a wire along a lower surface of a platen glass 21 on which an original is placed as shown in FIG.
2. It is configured to move the second and third mirror carriages 23 and take in the original image through the lens 24.

In the above-described image reading apparatus, as shown in FIG. 4, the fixing screws 32 of the capstan pulley 30 are set with the second and third mirror carriages 23 set at predetermined positions.
The first mirror carriage 22 is set at a predetermined position, and the wire 26 and the first mirror carriage 22 are fixed by the wire fixing part 25 of the first mirror carriage.
And adjust the assembly. In such an image reading apparatus, for example, when the first mirror 34 of the first mirror carriage 22 is displaced on one side as shown by 34 'due to wire elongation or the like, the document shown in FIG. 5
An image reading curve as shown in FIG. Therefore, even after assembly adjustment, by adjusting the fixing position of the wire 26 using a carriage positioning jig or the like with respect to aging such as wire elongation, the positional relationship from the platen to the lens can be obtained as designed. I have to. 31 is an idler pulley.

FIGS. 6 and 7 are views for explaining a capstan / pulley fixing / adjusting mechanism, wherein 1 is a shaft, 2 and 3 are pulleys, 4 and 7 are grooves, 5 is a pin fixing portion, and 6
Denotes a screw attachment portion, 26 denotes a wire, and 41 denotes a ball. As shown in FIG. 6, the capstan pulley includes a shaft 1, a fixed pulley 2 and an adjustment pulley 3, and each of the pulleys 2 and 3 has a pin fixing portion 5 for fixing to the shaft 1 and a screw. Grooves 4 and 7 for fixing the mounting portion 5 and the wire 26 are provided. on the other hand,
In the middle of the wire 26, there is a swaged ball 41. Then, as shown in FIG. 7, the wire 26 is fitted with the ball 41 at the center in the groove of the pulleys 2 and 3, and wound around the inner wire and the outer wire, for example, three turns each along the adjacent wire. Also, the fixed pulley 2 is pinned and fixed together with the shaft 1 by a pin at the pin fixing portion 5 as shown in the cross section AA, and the adjustment pulley 3 is fixed to the cross section BB by the screw mounting portion 5. Tighten the screw and fix it to the shaft 1 as shown. The shaft 1 has a cross section BB
As shown in (2), the diameter is reduced only at the portion where the screw is tightened, and if the screw is not tightened, the screw is rotatable, and the screw tip is cut into the shaft and fixed.

In the image reading apparatus, the position of the carriage is corrected by optical adjustment in order to absorb the variation of the focal length of the imaging lens and other components. Rotate the other pulley on the adjustment side with reference to the pulley on the fixed side fixed to the shaft with screws or pins, correct the position of the carriage engaged or fixed to this, and use the screw to Is cut into the shaft and fixed. The reason for fixing one is to make the reference side clear to the operator at the time of assembly and to prevent confusion when the adjustment-side screw is loosened and re-adjusted after installation.

[0006]

However, since the amount of correction performed by rotating the pulley on the adjustment side as described above is small, when this part is recycled and used, a lens, a carriage, etc. When any part is replaced without being recyclable, the optical adjustment is performed again, but the adjustment position of the pulley does not always match the position that was initially adjusted. When the adjustment side is adjusted / fixed by rotating the pulley on the adjustment side as in the related art, the trace of the screw fixed first remains on the shaft, and this is followed when the screw is tightened. As a result, the adjustment-side pulley cannot be fixed at the readjusted position, and assembling failure occurs.

[0007] Therefore, there is a method in which both of them have the same shape as the adjustment side and can be adjusted arbitrarily in the rotation direction. However, if the previous adjustment position is not marked on the pulley and the shaft, the pulley is rotated. Also returns to where the original screw mark on the shaft is,
Sometimes it becomes impossible to tell whether the position of the shaft has been changed by rotating the pulley.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can maintain stable quality of assembly adjustment even when used for recycling parts.

For this purpose, the present invention provides a pair of wires having a ball caulked in the middle for mounting an optical system, a shaft, a groove for fitting the ball, and a fixing portion for the shaft. A pair of pulleys each having a plurality of fixing portions so as to be fixed to the shaft at different rotation angles as a fixing portion of the shaft, and wrapping the pair of pulleys fixed to the shaft to fix a wire; An image is read by scanning an optical system.

Further, the pulley includes a first cylindrical hollow portion into which the shaft is inserted, and a plurality of second cylindrical hollow portions communicating from the first cylindrical hollow portion to the outer periphery. The pulley is fixed to the shaft by inserting the pulley into the second cylindrical hollow portion with a smaller number of pins than the number of hollow portions.
One of the pair of pulleys is fixed as a fixed-side pulley with a pin penetrating the shaft, and the other is fixed as a pulley on the adjustment side by tightening the shaft with a screw, and a plurality of tightening portions of the screw can be provided and selected. Or one of the pair of pulleys is fixed to a pulley on the fixed side, and the cross section of the shaft of the fixed portion is formed in a polygonal shape so that the cross section can be selected as a fixed surface, and fixed by tightening with a screw, and the other side is adjusted. The shaft is tightened with a screw and fixed as a pulley.

[0011] Further, a plurality of grooves provided on the pulley for fitting the balls are provided at different rotational angles so that a position where the wire is wound and fixed can be selected.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of an image reading apparatus according to the present invention, wherein 1 is a shaft, 2
And 3 are pulleys, 4 and 7 are grooves, 5 is a pin fixing portion, 6 is a screw attaching portion, 8, 9, and 11 are screws, and 10 is a pin.

In the combination of the fixed-side pulley 2 and the adjustment-side pulley 3 shown in FIG. 1A, the image reading apparatus according to the present invention enables the fixed-side pulley 2 to be rotated by 90 degrees, or an adjustment-side pulley. 3 is provided with a plurality of screw mounting portions at different positions so that the tightening position of the screw can be changed. The screw can be tightened and fixed at the position.

When the pulley 2 on the fixed side is fixed to the shaft 1, if the pulley 2 is penetrated by a pin 10 as shown in section AA in FIG. 6, the pin 10 is pulled out and fixed in order to change the adjustment position by recycling. Side pulley 2 must be rotated 180 degrees. Therefore, not only is it time-consuming, but also a factor that causes deformation of the shaft 1, the pulley 2, and the like.

In the embodiment shown in FIG. 1B, the portion of the shaft 1 for fixing the pulley 2 on the fixed side is cut into four planes, that is, the cross-sectional shape is square. When the cross section of the shaft 1 is made into a quadrangle in this way, it can be rotated by 90 degrees to enable two types of fixing, and when it is made into a polygon such as a hexagon, it can be rotated at a plurality of rotation angles by rotating according to the number of faces. Shaft 1
The pulley 2 on the fixed side can be fastened and fixed by the screw 8. Therefore, in the pulley 3 on the adjustment side, the shaft 1 rotates at a fixed rotation angle such as 90 degrees by fixing the pulley 2 on the fixed side even if the same screw mounting portion 6 as the previous time is used as in the conventional case. 1, the screw 9 is rotated by a relatively constant rotation angle, and the previous screw 9
Can be avoided.

In the embodiment shown in FIG. 1C, the fixed pulley 2 and the shaft 1 are penetrated and fixed by the pin 10 as in the prior art, and the screw mounting portions 6 at a plurality of different positions are fixed to the adjustment pulley 3. 6 'is provided. Therefore, even if the relative positions of the fixed-side pulley 2, the adjustment-side pulley 3, and the shaft 1 do not change, by changing the screw mounting portions 6, 6 ', the adjustment-side pulley 3 can be adjusted.
Then, the position of the shaft 1 that is different from the previous tightening mark,
The screw 9 can be fixed by tightening.

As described above, the pulley 3 includes the first cylindrical hollow portion into which the shaft 1 is inserted, and the plurality of second cylindrical hollow portions communicating from the first cylindrical hollow portion to the outer periphery. Of screws 9 less than the number of hollows
Alternatively, the pulley 3 is inserted into the second cylindrical hollow portion with a pin and
Is fixed to the shaft 1.

FIG. 2 is a view showing another embodiment of the image reading apparatus according to the present invention, in which a plurality of grooves 4-1 and 4-2 for fitting a caulked ball into a wire are provided to attach the wire. The fixed position can be changed. In this case, as shown in FIG. 2B and FIG. 2C, the fixed pulley 2 is fixed through the pin 1 together with the shaft 1 as in the conventional case, and the pulley 3 on the adjustment side is also screwed in the same manner as in the prior art. The screw 9 is fixed by tightening using the part 6. However, the fixed side pulley 2 has two grooves 4-1 and 4-2 as shown in FIG. 2D.
Therefore, when the caulked ball is fitted into the wire using any one of these, the tightening position of the screw of the shaft 1 by the screw mounting portion 6 of the pulley 3 on the adjustment side rotates by that amount. Therefore, FIG.
C, the two grooves 4-1 and 4 of the pulley 2 on the fixed side.
-2 rotated by 180 degrees, the pulley 3 on the adjustment side
In FIG. 2B, the screw tightening position on the shaft 1 can be rotated by 180 degrees as shown in FIG. 2B, so that the portion of the shaft 1 where the trace of the previous screw 9 remains can be avoided.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, two sets of two screw mounting portions are provided on the pulley on the adjustment side. However, three screw mounting portions are provided, and two of them are selected and used. Is also good. Further, when a plurality of screw attachment portions are provided, they are provided on the same cross section, but may be provided shifted in the axial direction. Further, the groove for fitting the ball caulked to the wire is provided on the fixed pulley. However, the groove may be provided on the adjustment pulley, or the rotation angle is set to 180 ° but 90 °. Needless to say, the angle may be other angles.

[0020]

As is apparent from the above description, according to the present invention, the pulley on the fixed side can be rotated by a fixed angle, or the pulley on the adjustment side is provided with screw mounting portions at a plurality of different positions. Since a plurality of grooves are provided for fitting the caulked ball into the wire of (1), the tightening position of the screw of the pulley on the adjustment side can be changed. By avoiding this, the screw can be tightened and fixed at different positions. Therefore, when the adjustment-side pulley is rotated and adjusted / fixed, even if the trace of the screw previously fixed remains on the shaft, that part can be avoided, so this will be the same when tightening the screw. Can be prevented. For this reason, the pulley on the adjustment side cannot be fixed at the readjusted position, the occurrence of assembly failure can be eliminated, and stable assembly adjustment quality can be maintained even when used for component recycling.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an image reading apparatus according to the present invention.

FIG. 2 is a diagram showing another embodiment of the image reading apparatus according to the present invention.

FIG. 3 is a diagram illustrating a schematic configuration of an image reading apparatus.

FIG. 4 is a diagram for explaining assembly adjustment of the image reading apparatus.

FIG. 5 is a diagram for explaining a bending of an image read by the image reading device.

FIG. 6 is a diagram for explaining a capstan / pulley fixing / adjusting mechanism.

FIG. 7 is a diagram for explaining a capstan / pulley fixing / adjusting mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft, 2 and 3 ... Pulley, 4 and 7 ... Groove, 5 ... Pin fixing part, 6 ... Screw mounting part, 8, 9, 11 ... Screw, 10 ... Pin

Claims (5)

[Claims] 1. A pair of wires having a ball caulked in the middle for mounting an optical system, a shaft, a groove into which the ball is fitted, and a fixing portion of the shaft are provided, and the shaft is fixed to one of them. A pair of pulleys each having a plurality of fixing portions so as to be fixed to the shaft at different rotation angles as parts, and wrapping around the pair of pulleys fixed to the shaft to fix a wire and scan the optical system An image reading apparatus characterized in that an image is read by scanning. 2. The pulley includes a first cylindrical hollow portion into which the shaft is inserted, and a plurality of second cylindrical hollow portions communicating from the first cylindrical hollow portion to the outer periphery. The image reading device according to claim 1, wherein the pulley is fixed to the shaft by inserting the pulley into the second cylindrical hollow portion with a smaller number of pins than the number of hollow portions. 3. One of the pair of pulleys is fixed as a fixed-side pulley with a pin penetrating the shaft, and the other is fixed as a pulley on the adjustment side by tightening the shaft with a screw, and tightening the screw. 2. The image reading apparatus according to claim 1, wherein a plurality of units are provided so as to be selectable. 4. One of the pair of pulleys is fixed to a pulley on the fixed side, and the cross section of the shaft of the fixed portion is formed in a polygonal shape so that it can be selected as a fixed surface. The image reading device according to claim 1, wherein the shaft is configured to be fixed as a pulley by tightening the shaft with a screw. 5. A pair of wires having a ball caulked in the middle for mounting an optical system, a shaft, a plurality of grooves at different rotational angles and fitted with the ball, and a fixing portion for the shaft. A pair of pulleys, and a wire is wound around and fixed to the pair of pulleys fixed to the shaft, and by selecting a groove into which the ball is fitted, a position to be fixed is selected to select an optical system. An image reading device configured to scan and read an image.