JPH08105519A - Pulley support structure - Google Patents

Abstract

PURPOSE: To make a pulley mounting operation simple, and enhance operating efficiency by pushing the inner diameter section of a pulley into a shaft with a groove so as to be inserted therein, letting the end section of a taper shaped step section be engaged with the groove section of the shaft, and thereby mounting the pulley onto the shaft. CONSTITUTION: A pulley 56 has a support member 74 pressed in its inner diameter section via a bearing 72, and a taper shaped step section 74A is formed in the circumferential surface of the inner diameter section of the support member 74 in the vicinity of its tip end section. Meanwhile, a stationary shaft 70 has a groove section 70A formed in the circumferential surface in the vicinity of its tip end section, and concurrently a taper 70B is formed in the circumferential surface of its tip end section. The end section of the taper shaped step section 74A is engaged with the groove section 70A of the stationary shaft 70 so as to allow the pulley 56 to be mounted onto the stationary shaft 70 by pushing and inserting the inner diameter section of the pulley 56 thereto along the stationary shaft with a groove 70. By this constitution, the pulley 56 can thereby be upheld by the stationary shaft 70 without falling off in one operation that the pulley 56 is pushed in the stationary shaft 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley supporting structure, and more particularly to a pulley supporting structure for moving an image reading unit in a copying machine or the like.

[0002]

2. Description of the Related Art In a copying machine or the like, an image reading unit is moved by pulling a wire. In this moving mechanism, a wire stretched by a pulley is connected to the image reading unit, and the image reading unit is moved by pulling the wire with a motor.

By the way, the pulley on which the wire is stretched is rotatably supported by a fixed shaft, and the structure of the supporting portion is as shown in FIG. That is, the pulley 1 is rotatably supported by press-fitting the bearing 2 press-fitted into the main body of the pulley 1 into the fixed shaft 3. Then, by inserting the E ring 4 into the end portion of the fixed shaft 3,
The pulley 1 is prevented from coming off during rotation.

[0004]

However, in the conventional pulley supporting structure, it is troublesome to mount the E-ring used for preventing the pulley from coming off, and the inside of the image reading apparatus is extremely narrow. There is a drawback that it is extremely difficult to attach the E-ring at a place.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pulley supporting structure which facilitates the work of attaching the pulley and improves the work efficiency.

[0006]

In order to achieve the above-mentioned object, the present invention comprises an inner diameter portion of a pulley made of an elastic material and a tapered step portion so as to reduce its diameter in a direction opposite to a pushing side. Is formed, and the pulley is attached to the shaft by pushing the inner diameter portion of the pulley into the grooved shaft to insert the end portion of the tapered step portion into the groove portion of the shaft.

[0007]

According to the present invention, when the tapered step portion of the pulley is pushed along the shaft, the tapered step portion is expanded by the shaft, and when the pulley step portion is pushed to a predetermined position, the tapered step portion is restored. The force engages the groove of the shaft. Thus, the one-touch work of pushing the pulley onto the shaft can support the pulley without coming off the shaft.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a pulley supporting structure according to the present invention will be described in detail below with reference to the accompanying drawings. First, before describing the pulley support structure according to the present invention, the overall configuration of an image reading apparatus to which the pulley support structure is applied will be described with reference to FIGS. 1 to 3.

FIG. 1 is a structural view showing an embodiment of an image reading apparatus to which a pulley supporting structure according to the present invention is applied. As shown in FIG.
A reading unit 1 mainly for reading originals
2. A platen glass 14 which is provided above the reading unit 12 and on which a document is placed, and a light-shielding cover 16 which is provided above the platen glass 14 so as to be openable and closable so as to block the incidence of external light when reading the document. It is configured.

The reading unit 12 includes a lamp unit 20, a first mirror unit 22, and a lens unit 2.
4, second mirror unit 26, and fixed reflection mirror 28
Etc., which are housed in a casing 18 formed of a light shielding structure. The lamp unit 20
Is a light source lamp 30 that irradiates the original with light and a first mirror that reflects the light scanned by the original toward the first mirror unit 22.
A reflection mirror 32 is provided and is supported so as to be slidable in the scanning direction of the document.

The first mirror unit 22 comprises a second reflecting mirror 34 and a third reflecting mirror 36, and the reflected light of the first reflecting mirror 32 is lensed through the second reflecting mirror 34 → the third reflecting mirror 36. The light is reflected toward the unit 24. The first mirror unit 22 is supported so as to be slidable in the scanning direction of the document, and moves in conjunction with the movement of the lamp unit 20.

The lens unit 24 includes an imaging lens 3
8 is provided and is slidably supported along the optical axis. The reflected light from the first mirror unit 22 is condensed by the imaging lens 38, and the magnification can be adjusted by sliding. The second mirror unit 26
Includes a fourth reflecting mirror 40 and a fifth reflecting mirror 42,
The light flux focused by the imaging lens 38 passes through the fourth reflection mirror 40 and the fifth reflection mirror 42, and then the fixed reflection mirror 28.
Reflect toward. The second mirror unit 26 is slidably supported in the same direction as that of the mirror unit 26, and the focus shift during zooming is corrected by moving in conjunction with the lens unit 24.

The fixed reflection lens 28 reflects the light flux reflected by the second mirror unit 26 and guides it to an unillustrated printing section. In the image reading apparatus 10 configured as described above, when the document placed on the platen glass 14 is read, the lamp unit 20 moves while irradiating the light source lamp 30 toward the document to scan the document. Then, the scanned light is reflected by the first reflecting mirror 32 toward the first mirror unit 22, and the reflected light is the second reflecting mirror 34 → the third reflecting mirror 36 of the first mirror unit 22.
Through the lens unit 24. In the lens unit 24, the light incident on the imaging lens 38 is condensed, and the focused light flux is passed through the fourth reflection mirror 40 → fifth reflection mirror 42 of the second mirror unit 26 and then is reflected by the fixed reflection mirror 28. It is reflected and guided to the printing section.

As described above, in the image reading apparatus 10, the lamp unit 20 is used as the light source lamp 3 when reading a document.
The original is scanned while moving while irradiating 0 with the original. Then, as the lamp unit 20 moves, the first mirror unit 22 also moves, and moves in conjunction with the lamp unit 20 so that the optical path length of the light incident on the imaging lens 38 becomes constant. The lamp unit 20 and the first mirror unit 22 are driven by pulling a wire stretched by a pulley.

2 and 3 are structural views of the drive mechanism for the lamp unit 20 and the first mirror unit 22. As shown in FIG. As shown in the figure, this drive mechanism is configured by tensioning two wires 44A and 44B at both ends of the lamp unit 20 and the first mirror unit 22, respectively, as follows. The configurations of both ends of the lamp unit 20 and the first mirror unit 22 are as follows.
Since they are the same, only the configuration on one side will be described, and the configuration on the other side will be assigned the same reference numeral and description thereof will be omitted.

One end of the first wire 44A is connected to a bracket 46 provided on the wall portion 18A of the casing 18, and the other end thereof is connected to the lamp unit 20 via a pulley 48 provided on the first mirror unit 22. It is connected to a provided bracket 50. And the second wire 44
B has one end connected to the same bracket 50 of the lamp unit 20 as the other end of the first wire 44A, and the other end of the first wire 44A via the pulleys 54 and 56 provided on the wall surface portion 18A of the casing 18. It is wound around a pulley 48 provided on the mirror unit 22. And the pulley 48
The wire 44B wound around the wire is wound around a pulley 58 which is horizontally supported, turned 90 degrees in the horizontal direction, and connected to one end of a spring 60. Then, the wires 44A and 44B stretched at both ends of the lamp unit 20 and the first mirror unit 22 (hereinafter, the wires 44A and 44B are referred to as wires 44) respectively have one ends of the second wires 44B. It is connected by connecting to the spring 60. In addition, the casing 18
One pulley 54 of the two pulleys 54, 56 provided on the wall surface portion 18 of the is fixed to a rotary shaft 68 to which a rotational force is transmitted to the motor 62 via gears 64, 66. It can be rotated by driving. The other pulley 56 is the casing 1
It is rotatably supported by a fixed shaft 70 provided on the wall surface portion 18A of No. 8 and engages with the movement of the wire 44 to rotate.

The pulling operation of the lamp unit 20 and the first mirror unit 22 with the wire stretched as described above is performed as follows. First, the motor 62 is driven to rotate the pulley 54 in the direction of arrow A in FIG. As a result, the lamp unit 20 is pulled by the wire 44 so that the lamp unit 20 shown in FIG.
Move to the right inside. Accordingly, the first mirror unit 2
2 also moves to the right, but the moving distance is 1/2 of the moving distance of the lamp unit 20 because it is the pulley.
Then, when the scanning of the document is completed, the driving of the motor 62 is stopped, and the biasing force of the spring 60 causes the lamp unit 20 and the first mirror unit 22 to return to the initial positions.

As described above, in the image reading apparatus to which the pulley supporting structure according to the present invention is applied, the lamp unit 20 and the first mirror unit 22 are moved by the pulling operation of the wire 44 to scan the document. . The support structure for the pulley that stretches the wire 44 is the rotary shaft 6
It is rotatably supported except for the pulley 66 fixed to 8, and the structure of the supporting portion is as follows.

FIG. 4 shows a state in which the pulley 56 is supported by the fixed shaft 70. As shown in the figure, in the pulley 56, a support member 74 is press-fitted into the inner diameter portion via a bearing 72, and a tapered step is formed on the peripheral surface of the inner diameter portion of the support member 74 in the vicinity of the tip end portion. The portion 74A is formed. On the other hand, in the fixed shaft 70, a groove portion 70A is formed on the peripheral surface near the tip portion, and a taper 70B is formed on the peripheral surface of the tip portion. The tapered stepped portion 74A formed on the support member 74 of the pulley 56 and the groove portion 70A formed on the fixed shaft 70 connect the pulley 56 to the fixed shaft 7.
It is formed such that when it is supported at 0, it fits, and the tip end of the stepped portion 74A engages with the tip end of the groove portion 70A to restrict movement in the axial direction. In addition, the pulley 56
The support member 74 is made of an elastic member (a synthetic resin material such as plastic) and has an inner diameter of the fixed shaft 70.
It is formed to be slightly smaller (about 0.1 mm) than the outer diameter of the fixed shaft 70, and the fixed shaft 70 is tightened at the time of support.

The operation of the embodiment of the pulley supporting structure according to the present invention constructed as described above is as follows. Pulley 56
When the support member 74 is pushed along the fixed shaft 70, the tapered step portion 74 formed on the inner diameter portion of the support member 74 is
The taper portion 70B formed at the tip of the fixed shaft 70 is guided and spread. Then, the tapered step portion 74A of the pulley 56 is provided with the groove portion 70 formed in the fixed shaft 70.
When pushed to A, the tapered stepped portion 74A is formed of an elastic member, so that the restoring force of the elastic member causes the fixed shaft 7 to move.
It fits in the groove portion 70A of 0. The tapered stepped portion 76A tightens the groove portion 70A of the fixed shaft 70, and the tip end of the tapered stepped portion 76A engages with the tip end portion of the groove portion 70A to restrict the movement in the axial direction.

As described above, according to the pulley supporting structure of the present embodiment, the pulley 56 can be supported on the fixed shaft 70 without coming off by the one-touch operation of pushing the pulley 56 onto the fixed shaft 70A. It is possible to easily perform the work of attaching the above to the fixed shaft 70 and improve the work efficiency. In addition, the number of parts can be reduced compared to the conventional support method using the E ring,
It is possible to reduce parts cost, assembly cost, and the like.

In this embodiment, the pulley used in the image reading apparatus such as a copying machine is described as an example to which the pulley supporting structure according to the present invention is applied. However, the present invention is not limited to this and the pulley supporting structure is not limited thereto. Any pulley can be applied as long as it is used in a narrow place where mounting work is difficult.

[0023]

As described above, according to the present invention,
Since the pulley can be supported without coming off the shaft by a one-touch work of pushing the pulley onto the shaft, the work for attaching the pulley can be performed easily and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of an image reading apparatus to which a pulley supporting structure according to the present invention is applied.

FIG. 2 is a structural diagram of a driving mechanism of a lamp unit and a first mirror unit in a reading unit.

FIG. 3 is a side view of FIG.

FIG. 4 is a sectional view of an embodiment of a pulley supporting structure according to the present invention.

FIG. 5 is an explanatory diagram illustrating a conventional pulley support structure.

[Explanation of symbols]

 56 ... Pulley 70 ... Fixed shaft 70A ... Groove 72 ... Bearing 74 ... Support member 74A ... Tapered step

Claims (1)

[Claims] 1. An inner diameter portion of a pulley is made of an elastic material, and a tapered step portion is formed so as to reduce in diameter in a direction opposite to a pushing side, and the inner diameter portion of the pulley is pushed into a grooved shaft. A support structure for a pulley, wherein an end of a tapered step portion is engaged with a groove portion of a shaft by inserting the pulley, and the pulley is attached to the shaft.