KR100374586B1 - One way power transmitting apparatus - Google Patents

Abstract

The disclosed one-way power transmission device includes a first gear that is power-connected with a first driven member that is rotated by a drive source, a second gear that is geared with the first gear and is powered by a second driven member, and a rotation shaft of the first gear. A first one-way bearing provided to support the first gear to rotate together with respect to the one-way rotation of the first driven member, and when the first gear is rotated by the one-way rotation of the first driven member. And a second one-way bearing which allows the second gear to rotate freely and locks the second gear against the rotation of the second gear. According to such a configuration, it is possible to selectively drive two driven members with one driving source, and to prevent malfunction by strictly restricting the movement of the other driven members while driving one driven member.

Description

One way power transmitting apparatus

The present invention relates to a one-way power transmission device that connects power so as to be transmitted only in one direction of rotation of a drive source.

In an electrophotographic printing machine such as, for example, a color laser printer, as shown in FIG. It is provided. On one surface of the photosensitive belt 10, an image to be printed is developed by a predetermined developing unit 30, and the developed image is dried while passing through the drying unit 40, and then the paper ( It is stamped in 1). The reference numeral 11 of the plurality of rollers is a drive roller for circulating the photosensitive belt 10 is connected to a drive source (not shown) to rotate.

However, in such a photosensitive belt 10, the accuracy of the image developed gradually deteriorates when its use period is prolonged. Therefore, after a certain life, it is necessary to replace the photosensitive belt 10 with a new one so that a clean image can be continuously developed. To this end, the present applicant has proposed a removable cartridge 200 for winding up the photosensitive belt 10 at the end of its life. It is installed on the traveling path of the photosensitive belt 10 and passes through the photosensitive belt 10 through the through slots 211 and 221 so as to stop so as not to interfere with the photosensitive belt 10. It is configured to wind the photosensitive belt 10 while rotating the revolver 220. Then, the removable cartridge 200 wound around the photosensitive belt 10 is taken out of the printing machine, and then, along with the mounting of the new photosensitive belt, the new cartridge 200 is also mounted.

Therefore, in order to drive the revolver 220 of the removable cartridge 200 as described above, a driving means detachable from the revolver 220 is required. For this purpose, the drive roller (rather than installing a separate drive source) It is preferable to configure the driving source of 11) in order to reduce the number of parts and reduce the weight of the product.

By the way, the drive roller 11 should always rotate to drive the photosensitive belt 10 while printing is in progress, the revolver 220 of the removable cartridge 200 only when collecting the photosensitive belt 10 Because of the rotation, a power transmission device capable of selectively changing the direction of power transmission from the drive source is required. In addition, in adopting this power transmission device, it should be taken into consideration that it is difficult if the revolver 220 rotates even a little while the driving source rotates the drive roller 11. This is because if the revolver 220 is moved even a little, it may cause interference with the photosensitive belt 10 that is being driven and may damage the photosensitive belt 10. Therefore, in view of these points, there is a need for an apparatus capable of selectively driving two driven members.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a one-way power transmission device capable of selectively driving two driven bodies with one driving source.

1 is a view schematically showing the internal structure of an electrophotographic printing press requiring a one-way power transmission device;

2 and 3 is a view showing a photosensitive belt changer and a photosensitive belt cartridge of an electrophotographic printing machine employing a one-way power transmission device according to the present invention;

4 is a perspective view illustrating main parts of the one-way power transmission device of the present invention;

5 is an exploded perspective view of FIG. 4;

6 and 7 are views for explaining the operation of the one-way power transmission device shown in FIG.

<Description of the symbols for the main parts of the drawings>

10 ... photosensitive belt 11 ... drive roller

100 ... Main cartridge 200 ... Removal cartridge

210 ... cylinder 220 ... revolver

300 ... Belt frame 311 ... 1st gear

312 ... 2nd Gear 311a ... 1st Directional Bearing

312a ... Secondary one-way bearing 315 ... Sensor

One-way power transmission device of the present invention for achieving the above object, the first gear is power-connected with the first driven member rotated by a drive source; A second gear gear-coupled with the first gear and in power connection with a second driven member; A first one-way bearing installed on a rotation shaft of the first gear to support the first gear to rotate together with respect to one direction rotation of the first driven member; Is installed on the rotating shaft of the second gear, when the first gear is rotated by one direction rotation of the first driven body to allow the second gear to rotate freely, the second gear in the opposite direction to rotate And a second one-way bearing which prevents locking.

Hereinafter, one-way power transmission device according to the present invention with reference to the accompanying drawings will be described in detail.

First, FIGS. 2 and 3 illustrate a photosensitive belt exchanger and a cartridge proposed in Korean Patent Application No. 99-25815 by the present applicant to facilitate mounting and collection of the photosensitive belt. To recapitulate the outline, first, the photosensitive belt cartridge is composed of a main cartridge 100 and a removable cartridge 200 which can be combined and separated from each other. The main cartridge 100 is formed in a cylindrical shape with one surface open, and is accommodated in an endless track state as in the photosensitive belt 10 mounted therein. The removable cartridge 200 is mounted on the belt frame 300 with the photosensitive belt while being separated from the main cartridge 100 when the photosensitive belt is mounted on the belt frame 300, and the cylinder 210 having a hollow formed therein. And a revolver 220 rotatably installed in the hollow of the cylinder 210. The outer circumferential wall of the cylinder 210 has a first through slot 211 through which the photosensitive belt 10 can pass, and the revolver 220 also corresponds to the first through slot 211. A second through slot 221 for passing the belt 10 is formed. Therefore, when the revolver 220 is stopped while the first and second through slots 211 and 221 are arranged to overlap each other, the photosensitive belt 10 is connected to the first and second through slots 211 and 221. You can drive through without interference. However, when the revolver 220 starts to rotate, a part of the photosensitive belt 10 returns to a state spanning the inside of the revolver 220, and thus, an inner circumferential wall of the cylinder 210 and an outer circumferential wall of the revolver 220. The photosensitive belt 10 is wound into the interspace. Of course, such an operation is performed only when collecting the photosensitive belt 10 that has reached the end of its life.

As such, the present invention provides a one-way power transmission device as shown in FIGS. 3 to 5 as a structure for rotating the revolver 220 when necessary. As described above, the revolver 220 may be rotated using the driving source 500 of the drive roller 11 for driving the photosensitive belt 10, and the revolver may be operated while the drive roller 11 is driven. 220 is never rotated.

Referring to the drawings, first, the drive roller 11 is provided with a connecting portion 313 connected to the drive source 500 side coupler 410 installed on the main frame 400 on its rotation axis. Therefore, the power of the driving source 500 is transmitted to the drive roller 11 through the connection portion 313 to rotate the photosensitive belt while driving. A first gear 311 and a second gear 312 that are powered by the drive roller 11 and the timing belt 314 are provided. The timing belt 314 is wound around the driving pulley 11a fitted to the drive roller 11 shaft and the driven pulley 311b provided on the rotation shaft of the first gear 311, thereby returning to the first gear 311. The rotational force is transmitted, and the first gear 311 is meshed with the second gear 312 again. In addition, first and second one-way bearings 311a and 312a are installed on the rotation shafts 318 and 319 of the first and second gears 311 and 312 so that power is transmitted only in one rotation direction. have. That is, when the drive roller 11 rotates clockwise as shown in FIG. 6, the power is transmitted to the driven pulley 311b through the timing belt 314 to move the driven pulley 311b in the same clockwise direction. Rotate However, since the first one-way bearing 311a of the first gear 311 is not transmitted in the clockwise direction, only the driven pulley 311b rotates and the first gear 311 itself stops. Keep it. In addition, the second one-way bearing 312a of the second gear 312 serves to lock the second gear 312 does not rotate in the counterclockwise direction. Therefore, even if the first gear 311 engaged therewith attempts to rotate slightly in the clockwise direction due to the rotational force of the first one-way bearing 311a, rotation is prevented by the second one-way bearing 312a. However, as shown in FIG. 7, when the drive roller 11 rotates counterclockwise, the driven pulley 311b is rotated counterclockwise by the timing belt 344, and the first one-way bearing ( The first gear 311 also returns counterclockwise through 311a. Accordingly, the second gear 312 engaged with the first gear 311 rotates in the clockwise direction.

On the other hand, a washer 317 and a ring member 316 are provided in the groove 318a formed at the end of the rotation shaft 318 of the first gear 311. This is to prevent the first gear 311 from escaping in the rotational axis axial direction while rotating. In addition, a disk-shaped locking plate 312d is provided in the second gear 312, and the gear side surface portion of the first gear 311 is in contact with the locking plate 312d. Accordingly, the second gear 312 cannot escape because the locking plate 312d interferes with the first gear 311 unless the first gear 311 is pulled out. That is, the first gear 311 itself serves to prevent the departure of the second gear 312. Accordingly, the separation prevention function of the two gears 311 and 312 may be simultaneously performed with one ring member 317.

In addition, the second gear 312 is formed with an intaglio portion 312b having a shape that is joined to the relief portion 222 provided in the aforementioned revolver 220. The embossed portion 222 of the revolver 220 is fitted into the indented portion 312b of the second gear 312, thereby making a power connection with the revolver 220. Therefore, when the photosensitive belt is driven for printing, the drive roller 11 is rotated clockwise to drive the photosensitive belt in a state where the first and second gears 311 and 312 do not rotate, and the photosensitive belt is recovered. In order to rotate the revolver 220 in order to rotate the drive roller 11 in a counterclockwise direction, the revolver 220 is rotated by transmitting power to the first and second gears 311 and 312.

On the other hand, the embossed portion 222 of the revolver 220 of the removable cartridge 200 and the intaglio portion 312b of the second gear 312 are combined with each other to combine the second gear 312 The entire position must always be the same. That is, if the second gear 312 is stopped at all, it is no use no matter how constant the position of the relief portion 222 of the revolver 220 before coupling. Therefore, as a sensing means for maintaining the initial position of the second gear 312 at all times, a positioning groove 312c is provided on one side of the engaging plate 312d of the second gear 312, and this groove 312c is provided. A sensor 315 for detecting the position of) is installed. That is, at the moment when the lever 315a of the sensor 315 is caught by the groove 312c, the relief portion 222 of the revolver 220 and the depression 312b of the second gear 312 are exactly matched. It becomes the position to become. Therefore, by detecting the position and stopping the second gear 312, the revolver 220 can always be accurately combined with the second gear (312).

When the photosensitive belt is collected in the coupled state, the drive roller 11 is rotated in the opposite direction as the photosensitive belt is driven as illustrated in FIG. 7. Accordingly, the revolver 220 that is powered through the first and second gears 311 and 312 rotates, and the photosensitive belt 10 is wound around the inner wall of the cylinder 210 as described above.

As described above, according to the one-way power transmission device according to the present invention, it is possible to selectively drive two driven members with one driving source, and also to malfunction by strictly restricting the movement of the other driven members while driving one driven member. Can be prevented.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (5)

A first gear power connected to the first driven member which rotates by a drive source; A second gear gear-coupled with the first gear and in power connection with a second driven member; A first one-way bearing installed on a rotation shaft of the first gear to support the first gear to rotate together with respect to one direction rotation of the first driven member; Is installed on the rotating shaft of the second gear, when the first gear is rotated by one direction rotation of the first driven body to allow the second gear to rotate freely, the second gear in the opposite direction to rotate A one-way power transmission device comprising a; one-way bearing to prevent locking. The method of claim 1, The first gear is prevented from being separated in the direction of the axis of rotation by the separation preventing means installed at the end of the axis of rotation, The second gear is provided with a locking plate that is interfered by the side of the first gear tooth, the first gear itself characterized in that the second gear to prevent the second gear from being separated in the axial direction of the rotation axis. The method of claim 2, The release preventing means is a one-way power transmission device comprising a; ring member is fixed to the groove provided at the end of the rotation shaft of the first gear to form a block for the axial separation. The method of claim 1, And a sensing means for always stopping the second gear at the initial position by sensing the initial position of the second gear. The method of claim 4, wherein The sensing means is: A groove formed on one side of the engaging plate of the second gear; And a sensor for sensing an initial position of the second gear by having a lever elastically engaged to the groove part when the second gear is positioned at the initial position.