JPH0727170B2 - Optical part stop position holding device in copier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding a stop position of an optical unit in a copying machine, and more specifically, an upper half part attached to a lower half part so as to be vertically rotatable. Further, the present invention relates to an optical part stop position holding device capable of effectively preventing the movement of the optical part in a state in which the upper half part is rotated upward in a so-called clamshell type copying machine.

<Prior art> Conventionally, the upper half can be rotated up and down with respect to the lower half, focusing on the advantage that jam processing or processing such as inspection and replacement of the photosensitive drum can be easily performed. There is provided a so-called clamshell type copier attached to the. In the clamshell type copying machine, when the upper half of the copier is rotated upward, for example, the side of the optical unit stopped at the home position becomes higher, so that the optical unit is prevented from naturally falling due to its own weight. However, it has been demanded to prevent damage to the lens.

A technique for satisfying this request is disclosed in, for example, Japanese Patent Laid-Open No.
-201039, Japanese Patent Laid-Open No. 59-111631 or Shokai
It is disclosed in JP-A-59-134148.

For example, the copying machine disclosed in Japanese Patent Laid-Open No. 59-201039 is provided with a rotating member that rotates in a predetermined direction in conjunction with the upper half of the copying machine being rotated upward. . Further, a clutch having one end of its rotation shaft connected to the center of the wire drum around which the wire connected to the document placing table is wound is provided. A pulley having a plurality of fins extending radially is fixed to the other end of the rotating shaft of the clutch.

In this configuration, when the rotating member is rotated in conjunction with the upward rotation of the upper half portion, various devices are operated accordingly, and finally, a predetermined regulation is performed in any one of the fins. A piece is inserted. As a result, the pulley is locked. Therefore, the wire drum connected to the pulley via the clutch is fixed, and the movement of the document placing table connected to the wire is prevented.

Further, as another technique for satisfying the above request,
For example, it has been proposed to electrically lock a motor for driving an optical section by means of a switch or a relay that conducts in conjunction with the upper half of a copying machine being rotated upward (for example, Japanese Patent Application Laid-Open No. 2000-242242). See JP-A-59-75239 and JP-A-59-102224.

<Problems to be Solved by the Invention> In the prior art typified by the technology disclosed in Japanese Patent Laid-Open No. 59-201039, the movable part that operates in conjunction with the upward rotation of the upper half of the copying machine is used. At least one member (in the technique disclosed in Japanese Patent Laid-Open No. 59-201039), at least one rotating member and a restricting piece is required. In particular, in the prior art disclosed in JP-A-59-201039, in addition to the movable member,
There is a need for a device for performing a necessary operation until the predetermined restriction piece is inserted into the fin. Therefore, there is a problem that the configuration is very complicated.

In addition, there is also a possibility that a member (for example, a spring) that absorbs an error in dimensional accuracy or mounting accuracy of each part to improve accuracy may be attached.

In particular, since various functional parts are arranged at optimal locations inside the main body of the copying machine, there may be no room for mounting the above movable member. In this case, the positions of the various functional parts should be adjusted. The movable member must be attached until it is displaced, and there is a problem in that it becomes a functionally unfavorable state.

Further, in the prior art in which the optical section drive motor is electrically locked, it is possible to reliably hold the stop position if there is a guarantee that the motor is always energized. This is done not only during processing, but also when processing such as replacement or inspection of the photoconductor drum or charger is required, so there is no guarantee that the energized state is maintained, and the energized state is maintained. If not, there is a problem that the optical part collides with the lens, causing damage or damage to the lens.

<Object of Invention> The present invention has been made in view of the above problems,
An object of the present invention is to provide an optical unit stop position holding device capable of reliably holding the stop position of the optical unit without being affected by whether or not it is energized and further simplifying the configuration.

<Means for Solving Problems> In order to achieve the above object, the optical unit stop position holding device of the present invention is configured to drive the wire to which the optical unit for exposing the document is connected to drive the optical unit. Optical section stop position holding device in a copying machine having a structure for reciprocally moving a document to obtain a copy corresponding to an original, and in which an upper half of the main body of the copying machine is attached to be rotatable up and down with respect to a lower half. A wire press-contact member fixed to the lower half part, and the wire press-contact member press-contacts the wire as the upper half part is rotated upward and is connected to the wire. The tension of the wire is increased so that the part does not move.

<Operation> In the above configuration, in a normal state in which the upper half portion is not rotated upward, the wire pressing member fixed to the lower half portion does not press the wire, so that the tension of the wire is not increased. As a result, the optical part connected to the wire can be reciprocated without any problem.

On the other hand, when the upper half portion is rotated upward, the wire pressing member presses the wire accordingly, and the tension of the wire is increased so that the optical portion connected to the wire does not move. As a result, it is possible to prevent the movement of the optical unit connected to the wire.

As described above, according to the above configuration, the movement of the optical unit can be reliably prevented when the upper half portion is rotated upward.

Moreover, since the structure for preventing the movement of the optical part is only the wire pressure contact member fixed to the lower half part, the structure can be simplified as compared with the prior art which requires at least one movable member. Can be planned.

In addition, it goes without saying that the above configuration is irrelevant to whether or not it is in the energized state.

<Examples> Hereinafter, detailed description will be given with reference to the accompanying drawings illustrating examples.

FIG. 3 is a schematic vertical sectional view showing the internal mechanism of the copying machine.

(1) is a main body of the copying machine, and includes a lower half (11) and a lower half (1) rotatably attached to the lower half (11).
2), a copying process in which an optical system (2) for original document scanning exposure is provided in the upper half portion (12), and a copied image is formed on the copy paper (P) in the lower half portion (11). A section (4) and a copy sheet conveying section (5) are provided. (14) is the contact glass, (15) is the document holder, (16a) (16b)
(16c) is a paper feed cassette, (16d) is a bypass bypass,
(17) is a pedestal.

The optical system (2) includes a light source (21), mirrors (22) (23).
(24), lens (25), and mirror (26), and along the guide shaft (27) and guide rail (28) (see FIG. 1), the light source (21) and the mirror (22) ( twenty three)
The document (D) on the contact glass (14) can be scanned and exposed by moving the (24) in the direction indicated by the arrow A. Then, the light source (21) and the mirror (22) move integrally, and the mirrors (23) and (24) also move integrally, so that the moving speed of the former becomes twice that of the latter. The light source (21) and the mirrors (22), (23) and (24) are collectively referred to as an optical unit (2 ′) in the following description.

FIG. 1 is a diagram showing the optical section (2 ') and the optical section drive mechanism in detail, including a support frame (61) to which a light source (21) and a mirror (22) are attached, and mirrors (23) (24). ) Is attached to the supporting frame (62), and the wire fixing plate (63) and the driven pulley (64) are attached to the supporting frame (62). In order from the end side of the wire, first it is wound around the driven pulley (64), then fixed to the wire fixing plate (63), wound around the wire drum (67) via the guide pulley (66), and then the tension pulley (70). )
It is wound around the guide pulley (69) via the, and finally is wound around the driven pulley (64).

Further, a pressure contact shaft (71) which is a wire pressure contact member is attached to the wire (65) at a predetermined distance above a portion of the wire (65) wound around the wire drum (67) from the guide pulley (66). The pressure contact shaft (71) is fixedly attached to the upper end of a support member (72) provided in the lower half (11) and supporting the upper half (12). Half (12)
The pressure contact shaft (71) is set to a value capable of pressure contacting the wire (65) with a predetermined force in a state where the wire is rotated upward.

Returning to FIG. 3, the copy paper transport unit (5) includes paper feed rollers (51a) (51b) (51c) and paper feed rollers (52b) (52c) (5).
2d), paper feed paths (53a) (53b) (53c) (53d), registration rollers (54), conveyance rollers (55), conveyance belts (56),
It has a heat fixing device (57) and a discharge roller (58), and by selectively driving any of the paper feed rollers, any of the paper feed cassettes (16a) (16b) (16c) or manual feed The copy papers (P) are fed one by one from the bypass (16d), guided to the copy processing section (4) to transfer the toner image, and the toner image is heated and fixed by the heat fixing device (57), and then received. It is configured to discharge onto the table (17),
The present invention is not limited to this configuration, and it is possible to use a copy paper transporting unit having another conventionally known configuration, such as a configuration in which the paper feed side and the discharge side are the same side.

Further, the copy processing section (4) has a charging charger (42), a developing device (43), a transfer charger (44) and a separation charger (42) around a photosensitive drum (41) which rotates in a direction indicated by C in the figure. 45) and a cleaner (46) are arranged in this order, and an original image is formed on the outer surface of the photosensitive drum (41) that is uniformly charged by the charging charger (42) to form an electrostatic latent image. After that, the developing device (43) visualizes the toner image, the transfer charger (44) transfers the toner image onto the copy paper (P), and the cleaner (46) collects the residual toner. However, the present invention is not limited to this configuration, and it is also possible to use a copy processing unit having another conventionally known configuration such as one using a photoconductor on a belt.

The operation of the copying machine having the above configuration is as follows.

When performing the copying operation, since the upper half portion (12) is in a normal state in which it is not rotated upward (see the solid line in FIG. 2), the wire (65) and the press contact shaft (71) are The wire drum (67) is separated by a predetermined distance and the wire drum (67) is rotated by a drive source (not shown) to move the optical part (2 ') to move the document (D) set on the contact glass (14). After the exposure, the reflected light is guided to the copy processing unit (4) to form a toner image corresponding to the original, and the toner is applied to the surface of the copy paper (P) conveyed at a predetermined speed by the copy paper conveying unit (5). An image can be transferred and heated and fixed by the heat fixing device (57) to obtain a copy corresponding to the original.

Also, when performing jam processing or processing such as inspection and replacement of the photosensitive drum (41) and various chargers, the upper half (12) is rotated upward around the rotation fulcrum (13). The wire (65) is pressed against the pressure contact shaft (71) between the guide pulley (66) and the wire drum (67) because the wire (6
Since the part of the wire 5) which is wound around the wire pulley (67) by the guide pulley (66) is strongly pressed against the guide pulley (66) and the wire drum (67), the tension of the wire (65) is increased. Will increase. As a result, wires (65)
Is prevented from moving freely. Therefore, the optical part (2 ') can be held at the stop position. Therefore, the optical part (2 ') moves by its own weight, and the lens (2')
It is possible to reliably prevent the inconvenience of being hit or damaged by colliding with 5).

However, the stop position may be the home position which is the stop position of the optical unit (2 ') in the state where the copying operation is not performed, but in the case of performing a jam process, the reciprocating path of the optical unit (2') is used. Since it is highly likely that the vehicle has stopped halfway through, it is used as a concept that includes such a halfway stop position.

As is clear from the above description, when the moving force applied to the optical part (2 ′) in the state where the upper half part (12) is rotated upward is large, the wire (6
5) The mounting position of the pressure contact shaft (71) (that is, the pressure contact shaft (71) and the wire (65) so that the amount of bending of the portion wound around the wire drum (67) from the guide pulley (66) becomes large. Distance).

Also, regarding the pressure contact position of the wire (65) by the pressure contact shaft (71), the position close to the guide pulley (66), the intermediate position between the guide pulley (66) and the wire drum (67), and the wire drum (67) It may be in any of the close positions,
The closer to the wire drum (67), the stronger the force for holding the optical part (2 ') at the stop position.

The present invention is not limited to the above-described embodiment, and for example, a portion in which the pressure contact shaft (71) is wound around the wire fixing plate (63) of the wire (65) around the guide pulley (66). Installed a certain distance above, guide pulley (66)
The wire (65) and the pressure contact shaft (71) can be pressed against each other between the wire fixing plate (63) and the wire fixing plate (63) while the upper half (12) is rotated upward. In addition, a rotating body such as a roller can be used in place of the pressure contact shaft (71), and various design changes can be made without departing from the scope of the invention.

<Effects of the Invention> As described above, according to the present invention, when the upper half portion is rotated upward, the wire to which the optical portion is connected is pressed by the wire pressing member fixed to the lower half portion. As a result, the tension of the wire increases to such an extent that the optical section connected to the wire does not move, so that movement of the optical section due to its own weight can be prevented and the optical section can be reliably stopped at a predetermined stop position. Therefore, it is possible to reliably prevent the lens from being damaged or damaged due to the movement of the optical portion due to the upward rotation of the upper half portion.

In addition, as described above, since the structure for achieving the holding of the stop position of the optical unit is only the wire pressure contact member fixed to the lower half portion, at least the movable member that interlocks with the upward rotation of the upper half portion is used. One is that the configuration can be simplified as compared with the conventional technology that was necessary.

In addition, it goes without saying that the above configuration is irrelevant to whether or not it is in the energized state.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of an optical part stop position holding device, FIG. 2 is a view for explaining the operation of the optical part stop position holding device, and FIG. 3 is a schematic vertical section showing an internal mechanism of a copying machine. Face view. (1) ... Copier body, (2 ') ... Optical section, (11) ... Lower half, (12) ... Upper half, (65) ... Wire, (71) ... Pressure contact axis, (D) ... Original , (P) ... Copy paper

Claims (1)

[Claims] 1. A structure for obtaining a copy corresponding to a document by reciprocally moving the optical part by driving a wire to which an optical part for exposing the document is connected. A copying machine having a structure in which a half part is attached to the lower half part so as to be rotatable up and down, and has a wire pressure contact member fixed to the lower half part, and the wire pressure contact member has an upper half part rotated upward. Along with this, the optical part stop position holding device in a copying machine is characterized in that the optical part connected to the wire is pressed to increase the tension of the wire so as not to move.