JP2520076Y2 - Positioning device for parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention provides a sub-unit that is gently held in a unit that can be set in and released from a predetermined position with respect to an image carrier in an image forming apparatus. The present invention relates to a positioning device for a subunit of an apparatus, which is configured to press a reference surface of an apparatus body for positioning when the unit is set.

2. Description of the Related Art Transfer / separation chargers of electrostatic recording devices such as electrophotographic copiers, Famiximeters, and laser printers can be attached to and detached from the main body of the device, and when removing the jam of transfer paper generated at that part, it is exposed to light. It is necessary to clear the jammed paper away from the body and then accurately set it in place.

In order to enable the above, the transfer / separation charger is inserted into and removed from a holding frame that can be set and released at a predetermined position of the recording apparatus main body so that the transfer / separation charger is inserted into the holding frame. The separation charger employs a positioning device that is set in a predetermined position by being pressed against a reference surface provided in the main body of the device by a spring provided in the frame when the frame is set in a predetermined position. .

FIG. 4 is a diagram showing an overall schematic configuration of an example of an electrophotographic copying machine having a transfer / separation charger positioning device having such a configuration. In this copying machine, the original fed on the contact glass at the top of the apparatus by the automatic original feeding apparatus 1 is instantaneously illuminated by the illumination lamp 2 having the reflection plate 2a at the same time, and the first mirror 3 and the imaging lens 4 are provided. , Is circulated around the plurality of support rollers 6a via the second mirror 5,
An image is formed on the peripheral surface of the photoconductor belt 6 which has been uniformly charged by the charging charger 7 in advance to form an electrostatic latent image. The electrostatic latent image is developed by the developing device 8 to form a toner image. This toner image is transferred from the paper feeding device 9 to the transfer paper sent through the registration roller 24 by the operation of the transfer charger 10, and then the transfer paper is transferred from the photoreceptor belt 6 by the operations of the separation charger 11 and the separation claw 12. It is separated, adsorbed by the conveyor belt 13 having the suction means 14 inside, conveyed to the fixing device 15 and fixed, and then discharged to the paper discharge tray 16. The toner remaining on the photosensitive belt 6 after the transfer is cleaned by the cleaning unit 17 to prepare for the next image formation.

The construction in the vicinity of the transfer charger 10, separation charger 11 and conveyor belt 13 of this copying machine is shown in detail in FIGS. The transfer charger 10 and the separation charger 11 are configured as an integrated transfer / separation charger, and the transfer belt 13
5th with the shaft provided at the position supporting the upper end of the
From the predetermined set position in the state shown in the figure, the conveyor belt is attached to the unit frame 19 which can swing counterclockwise by a certain angle in the figure.
It is attached together with 13 and constitutes a transfer / separation unit A.

The transfer / separation chargers 10 and 11 are projectingly provided on the transfer / separation charger mounting side of the unit frame body 19, and have a contact portion 19a and 19b facing the surface of the frame body 19, respectively. And the flange portions on both sides of the casing are inserted and removed, and the back surface of the casing is pressed by the leaf springs 15 attached to the unit frame, and the flange portion of the casing contacts the contact surfaces 19a, 19B of the holding portion. It is urged in the direction of pressure contact with. At both ends 10c of the casing of the transfer / separation chargers 10 and 11, as shown in FIG. 6, there are positioning surfaces 22a and 22b facing the positioning reference surfaces 26a and 26b provided on the photosensitive belt unit side plate 26. A protrusion is provided.

The transfer / separation unit frame 19 has a toggle mechanism 21a, 21a provided between the transfer / separation unit frame 19 and a bracket 21 that pivotally supports the transfer / separation unit frame 19.
b, the transfer / separation chargers 10 and 11 are attached to the photosensitive belt 6.
Is pressed against the stopper 20 at a predetermined set position in the vicinity of and is positioned and fixed. In this state, transfer / separation charger 1
The flanges of the casings 0 and 11 are the contact surfaces 19a and 19b of the holding part.
Away from, the positioning surface 22a, 22b of the casing end portion by the biasing force of the leaf spring 15 abuts the reference surfaces 26a, 26b of the photosensitive belt unit side plate 26 and is positioned at a predetermined position,
The distance between the transfer / separation chargers 10 and 11 and the peripheral surface of the photosensitive belt 6 is maintained accurately. In addition, the distance between the tip of the transfer entrance guide member 10a mounted on the casing of the transfer charger 10 in order to bring the transfer paper fed from the registration roller 24 into contact with the photosensitive belt 6 and the photosensitive belt 6. The transfer paper is securely brought into close contact with the photoconductor by accurately maintaining the above, and the transfer blur and the transfer blurring at the front and rear ends of the transfer paper due to poor adhesion are prevented.

Vertical direction of transfer / separation charger (transfer paper transport direction)
In order to facilitate the insertion / removal of the charger, a slight play is provided between the charger and the holding portion of the frame, so that the positioning guide B is provided orthogonal to the contact surface 19b of the lower holding portion. The positioning surface provided on the outer surface of the rising portion of the inlet side casing of the transfer charger 10 is brought into contact with each other to perform vertical positioning.

Since the conventional transfer / separation charger positioning device has the above structure, the transfer / separation charger 1
Nos. 0 and 11 are pushed by the leaf springs 15 at their backs when the unit frame 19 is in the set position where it abuts on the stopper 20 and when the unit frame 19 is in the position retracted from the photoconductor belt 6, and the casing flange is held when retracted. The transfer / separation chargers 10 and 11 are in pressure contact with the contact surfaces 19a and 19b of the section and the positioning guide B
When the frame body 19 is retracted when it is inserted into the frame body in a state of floating above from the guide body or is separated from the guide B by some force, the transfer / separation chargers 10 and 11 have flanges and contact surfaces. Due to the frictional force between 19a and 19b and the frictional force between the leaf spring 15 and the casing back surface, it is difficult to contact the positioning guide B by its own weight, which makes it difficult to perform accurate positioning.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is, like the conventional transfer / separation charger positioning device of the copying machine having the above-described configuration, a sub-unit held in a unit frame that can be set and retracted at a predetermined set position of the main body of the device. In view of the above disadvantage of the positioning device in which the unit is pressed by the biasing means such as a spring provided on the frame body against the reference surface provided on the main body of the apparatus, the sub-unit is in a state where the unit is retracted from the set position of the main body of the apparatus. Is a unit that can move freely within the unit's holding section and is easily brought into contact with a positioning guide in the direction perpendicular to the reference plane by its own weight, etc. to ensure reliable positioning. When the unit is set, its position can be reliably maintained. An object is to provide a device.

Means for Solving the Problems In the positioning device of the present invention, in order to solve the above problems, the unit displacing in a substantially horizontal plane with respect to the image carrier regulates the movement of the subunit toward the image carrier. Holding means and pressing biasing means for restricting the movement of the subunit in the direction away from the image carrier, and these holding means and the pressing biasing means are configured such that the subunit is displaced and the pressing biasing means The sub-unit has a space so that the sub-unit can take a position where the pressing force of the sub-unit is released and is not regulated by the holding means. Direction, it is supported by a positioning guide disposed below it, and in the horizontal direction, it is gently held between the pressing biasing means and the holding means. At least a part of the subunit comes into contact with the reference surface on the image carrier body side, so that the subunit is elastically contacted with the pressing biasing means and positioned by the elastic force. With the above configuration, when the unit (transfer / separation unit A in the above example) is in the released state, the pressing urging means does not act on the subunits (transfer / separation chargers 10 and 11 in the above example), and the subunit is It is possible to freely move in a plane parallel to the reference plane and surely abut against a positioning plane perpendicular to the reference plane by its own weight or the like. From this state, if the unit is set to a predetermined position, the subunit comes into contact with the reference surface of the main body of the apparatus and is then pushed and pressed by the pressing biasing means, which is pressed against the reference surface of the main body by the action of the biasing force. Therefore, the position can be surely held.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a positioning device for a transfer / separation charger of a copying machine described in FIGS. 4 to 6 will be described in detail with reference to the drawings.

In this embodiment, when the transfer / separation unit A is set at a predetermined position, the transfer / separation charger 10, 11 of the frame 19 is pressed to position the transfer / separation chargers 10, 11 against the reference surface of the apparatus main body. As shown in FIGS. 1 to 3, the free end of the leaf spring 15 whose one end is fixed to a portion of the casing 11 facing the casing back surface is bent into a “V” shape, and the outside of the bent portion is transferred. Not only is the separation charger 10,11 pressed against the rear surface of the casing, but its free end extends through the hole 31 provided in the frame 19 and then extends further beyond the range of the hole 31. Therefore, even if the pressing force does not act on the bent portion, the leaf spring 15 cannot be in the shape of the natural state shown by the chain line in FIG. 2, and the free end upper surface of the leaf spring 15 is the frame body as shown by the solid line. The outer surface of the bent portion catches on the outer surface outside the range of the hole 31 of 19 and the contact surfaces 19a and 19a of the holding portion of the frame body 19
The distance between the flat surface determined by b is considerably wide, and in this state, when both side flanges of the transfer / separation charger casing abut the holding portion contact surfaces 19a, 19b, the casing back surface and the leaf spring 15 bend. There is a gap between the outside and the outside. However, when the transfer / separation unit A is pushed by the toggle mechanisms 21a, 21b and set in a predetermined position, the positioning surfaces 22a, 22b at both ends of the transfer / separation charger casing are exposed as described above with reference to FIG. Transfer it by pressing it against the reference surfaces 26a, 26b of the body belt unit side plate 26.
The flange of the separate charger casing is the unit frame
As shown in FIG. 5, which is separated from the holding portion contact surfaces 19a and 19b of the holder 19, the outer surface of the bent portion of the leaf spring 15 is located on the outside of the casings 10d and 11d of the transfer / separation chargers 10 and 11 as shown in FIG. When pressed by the back surface, the free end of the leaf spring 15 moves away from the outer surface of the frame body 19 and urges the transfer / separation chargers 10 and 11 against the reference surface of the photosensitive belt unit.

With the above-described structure, when the transfer / separation unit A is retracted from the photosensitive belt, the transfer / separation chargers 10 and 11 easily drop due to their own weight, and are surely placed on the positioning surface B orthogonal to the reference surface. When the transfer / separation unit A is set to a predetermined position by engaging with each other and is vertically positioned, the transfer / separation chargers 10 and 11 are pressed against the reference surfaces 26a and 26b by the leaf springs 15 to form the photosensitive belt 6. Are positioned so that the distance between them is constant, and the vertical movement is prevented.

The present invention is applicable not only to the transfer / separation charger positioning device of the copying machine shown in the embodiment but also to a member that is gently held by a unit that can be set and retracted at a predetermined position of the apparatus main body when the unit is set to a spring. The present invention is also applicable to a positioning device for various members, which is brought into contact with the reference surface of the device by force to perform positioning, retracts the unit, and performs vertical positioning by dropping the member due to its own weight or the like.

Effects As described above, according to the present invention, with a simple configuration,
The sub-unit can be easily pulled out from the unit when the unit is released, and the sub-unit to be positioned can be reliably positioned and held in the direction in which it is in pressure contact with the reference surface or in the vertical direction such as the vertical direction when the unit is set. be able to.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing essential parts of an embodiment of the present invention, and FIG.
FIGS. 3 and 4 are sectional views for explaining the action of the pressing and urging member, and FIG. 4 is a sectional view showing the overall structure of an example of a copying machine having a transfer / separation charger to which the present invention is applied. FIG. 6 is a cross-sectional view showing in detail the structure in the vicinity of the transfer / separation unit, FIG. 6 is a side view of the end portion, and FIG. 7 is an exploded perspective view showing the conventional structure of the main part. A: transfer / separation unit (unit), 10, 11 ... transfer / separation charger (sub-unit), 15 ... leaf spring (press urging means), 19 ... transfer / separation unit frame (holding means) , 19a, 19b ... Holding portion contact surface (holding means), 26
a, 26b …… Reference plane

Claims (1)

(57) [Scope of utility model registration request] 1. A unit (A) which can take a setting position and a releasing position on an image carrier body, and from the setting position of the unit (A) to the releasing position when the unit (A) is at the releasing position. And a sub-unit (10, 11) which is detachable from the unit (A) in a direction substantially orthogonal to the moving direction of the image carrier and which positions the sub-unit with respect to the image carrier main body. On the other hand, the unit (A) which is displaced in a substantially horizontal plane includes holding means (19a, 19b) for restricting the movement of the subunits (10, 11) in the direction approaching the image carrier, and the subunits (10, 11). ), A pressing biasing means (15) for restricting the movement of the holding means (19a, 19b) and the pressing biasing means (15) from the image carrier. ) Is displaced and the pressing force from the pressing force means (15) is released and held. The sub-units (10, 11) are spaced so that the sub-units (10, 11) can take positions that are not restricted by the steps (19a, 19b). The unit is supported by a positioning guide (B) arranged below it in the vertical direction, and is gently held horizontally between the pressing biasing means (15) and the holding means (19a, 19b). When the unit (A) is in the set position, at least a part of the subunit comes into contact with the reference surfaces (26a, 26b) on the image carrier main body side, so that the pressing biasing means (15) is provided. A positioning device which is elastically brought into contact with and is positioned by the elastic force.