JPH07104643B2 - Recording device - Google Patents

Description

The present invention relates to a recording device such as an electrophotographic copying machine and a laser beam printer.

[Prior Art] In an electrostatic image recording apparatus of this type, a cleaning member such as a blade or a roller that removes residual toner on the photoconductor is rubbed at the same position in the axial direction of the photoconductor to remove the photoconductor. In order to prevent damage, or in a laser beam printer, to prevent deterioration of the photosensitive layer due to repeated image exposure of the same print pattern at the same position in the axial direction of the photoconductor, the shaft is rotated at the same time as the photoconductor is rotated. There have been various proposals for making a slight reciprocating motion in a certain direction (for example, Japanese Patent Publication No. 59-11910 and Japanese Patent Publication No. 59-697).
(See Japanese Patent Publication No. 65).

[Problems to be Solved by the Invention] As shown in the above-mentioned known example, a rotary drive mechanism for a photoconductor and a drive mechanism such as a cam mechanism for linearly reciprocating the photoconductor in the axial direction are provided on one end side of the photoconductor. When the above-mentioned reciprocating linear drive mechanism is incorporated into an existing electrostatic photography recording apparatus, the arrangement of them collectively has a problem in that they cannot be incorporated unless the position of the photoconductor is shifted in the axial direction.

Therefore, as shown in FIG. 3, it is known that a reciprocating linear drive mechanism is arranged on the side opposite to the rotary drive mechanism of the photoconductor and driven by a motor different from the drum rotary drive motor. However, it is uneconomical to provide a separate motor, and a complicated control device or the like for synchronously driving both motors is required.

As shown in FIG. 4, a paper feed roller such as a register roller is also known as a drive source. However, since the roller is rotated intermittently, the impact at the time of the interruption is smooth. There is a possibility that the rotation of the photoconductor should be adversely affected.

Further, when the reciprocating linear drive mechanism using the paper feed roller or the motor as a drive source as described above is assembled to the existing electrostatic photography device, the degree of freedom in design is low, and it is difficult to put it together. Further, it is difficult to construct the above-mentioned reciprocating linear drive mechanism as one unit, and the assembling property of the device is also poor.

The present invention is intended to solve the above-mentioned problems, and not only can the drum type photoconductor be reciprocated in the axial direction by utilizing the rotational force of the drum type photoconductor, (EN) Provided is a recording device which is remarkably improved in assemblability.

[Means for Solving the Problems] In the recording apparatus for forming an image on a recording medium, the present invention which achieves the above object, comprises a drum type photoconductor, the drum type photoconductor supporting the drum type photoconductor, and the drum type photoconductor. A support shaft that rotates integrally with the support shaft, and a detachable mount for supporting the support shaft and mounting the drum type photoconductor on the main body of the recording apparatus so as to close an opening provided in the main body of the recording apparatus. A positioning member for the supporting shaft, a motor, and a first member for transmitting the driving force of the motor to the drum type photoconductor, which is provided at one end side of the drum type photoconductor for rotating the drum type photoconductor. One driving force transmitting means, and a displacement means for reciprocating the drum type photoconductor in the axial direction of the drum type photoconductor, which is provided on the other end side of the drum type photoconductor and is provided on the positioning member of the support shaft, Dora Provided on the positioning member of the supporting shaft on the other end side of the photosensitive drum,
A second driving force transmission means for transmitting the rotational force of the drum type photoconductor to the displacement means for reciprocating the drum type photoconductor in the axial direction thereof; The positioning member, the displacing means, and the second driving force transmitting means as a unit can be attached to and detached from the main body of the recording apparatus, and the drum type photoconductor passes through the opening to which the positioning member of the support shaft is to be attached. Accordingly, the recording apparatus is detachable.

[Operation] The support shaft of the photoconductor rotates integrally with the photoconductor, and the reciprocating linear drive mechanism is driven in association with the rotation of the support shaft. Further, the positioning members for the photoconductor and the support shaft are easily attached to and detached from the recording apparatus main body.

[Example] Hereinafter, a specific description will be given with reference to the drawings.

In the examples described below, a rotary drive mechanism for the photoconductor is arranged on one end side of the photoconductor, and an axial reciprocating linear drive mechanism for the photoconductor is arranged on the other end side of the photoconductor. The support shaft of is configured to rotate integrally with the photoconductor,
The recording device is configured to drive the reciprocating linear drive mechanism by the rotation of the support shaft.

In the figure, 1 is a drum type photoconductor, 2 is a support shaft of the photoconductor 1, M1 is a rotation driving motor of the photoconductor 1, and is provided on a support shaft 2 from a gear 4 on an output shaft 3 thereof. The photoconductor 1 is transmitted to the gear 5, and the photoconductor 1 is rotated from the gear 5 via a flexible joint (thrust flexible joint) 6.

In the flexible joint 6, a pair of annular spring plates 6a and 6b arranged face to face are connected at one position in the circumferential direction by a pin 6c or the like, and the spring plates 6a and 6b are connected to the gear 5 on the side opposite to the warp and the diametrical direction. The end plates 1a of the photoconductor 1 are fixed to the end plates 1a by pins 6d, 6d, etc., and allow the axial movement of the photoconductor 1 to transmit the rotational torque from the gear 5 to the photoconductor 1.

Reference numeral 7 denotes a cylindrical cam for reciprocating movement of the photosensitive member, which is rotatably provided on the support shaft 2 on the side opposite to the flexible joint 6, and has a wavy cam groove 7a on its peripheral surface. Reference numeral 8 denotes a drive gear integrally provided with the cam 7, and by rotating the cam 7 at a speed slightly different from that of the photoconductor 1, the photoconductor 1 is axially moved through a cam follower 9 engaged with the cam groove 7a. Move back and forth. Reference numeral 10 is a support member for the cam follower 9.

However, conventionally, as shown in FIGS. 3 and 4, the photosensitive member supporting shaft 2 is fixed to the side plates 11 and 12 of the apparatus main body by the supporting member 13 and the centering plate 14, and the photosensitive member reciprocating cam 7 is provided. Integrated gear 8
Motor M2 (Fig. 3) or paper feed roller 15 (Fig. 4)
Is to be rotated via gears 16-18,
There was the problem mentioned above.

Therefore, according to the present invention, as shown in FIG. 1, the photosensitive member support shaft 2 is rotatably attached to the side plate 11 and the centering plate 14 via the bearings 11a and 14a, and the gear 5 is attached to the support shaft 2 by the screw 5a. The support shaft 2 is integrally rotated in the same direction as that of the photoconductor 1 by fixing the support shaft 2 and the like. Further, by means of a cam drive gear 16 attached to the end of the support shaft 2 on the opposite side of the gear 5 in a non-rotating manner, through the gears 17 and 18 rotatably provided on the centering plate 14 by the shaft 19, The gear 8 integrated with the cam 7 is rotated.

In FIG. 1, reference numeral 20 is a heat-retaining heater such as a surface heating element attached to the inner peripheral surface of the photoconductor 1, reference numeral 21 is a printed wiring board for energizing the heat-retaining heater 20, which is exposed by a supporting member (not shown). It is attached and supported in the body 1. Reference numeral 22 is a power cord thereof, which is wired in the tubular support shaft 2 through a cord insertion hole 23 formed in the support shaft 2 and is connected to a power collector 24 provided at the end of the support shaft 2 to omit a power supply not shown in the drawing. It is connected to the. The current collector 24 is composed of a slip ring 24a attached to the outer peripheral surface of the end of the support shaft 2 via an insulating sleeve 25, and a brush 24b contacting the outer peripheral surface of the slip ring 24a. The power cord 22 is wired with a slack between the cord insertion hole 23 and the substrate 21 in order to allow the photosensitive member 1 to move in the axial direction.

FIG. 2 shows a modified example in which the axial reciprocating linear drive mechanism of the photoconductor 1 is assembled as one unit to the centering plate 14.

That is, on both sides in the axial direction of the boss portion of the cam driving gear 16,
The cylindrical cam 7 and the cylindrical portions 16a and 16b extending into the inner hole of the bearing 14a are integrally formed and fitted to the support shaft 2 in a detent manner. 26
Numeral 26 is a retaining ring fitted to the tip of the tubular portion.

Further, the support member 10 of the cam follower 9 is formed in a short cylindrical shape, and the flange 10a formed at one end thereof is detachably attached to the end plate 1b of the photoconductor 1 with a screw 27 or the like. 28 is a tool insertion hole such as a screwdriver formed in the centering plate 14.

Then, for example, during maintenance such as replacement of the photoconductor 1, a mounting screw 27 for the cam follower support member 10 and the centering plate 14
・ By removing 29, cam 7 and its drive gear 8 ・
16-18, the cam follower support member 10, and the centering plate 14 can be easily attached and detached as one unit, and the loss of these parts is prevented. The photosensitive member 1 is put in and taken out through an opening 12a formed in the side plate 12.

In the above-described embodiment, the mechanism for reciprocating the photosensitive member 1 in the axial direction is driven by the rotation of the photosensitive member supporting shaft 2 as described above. Therefore, as in the conventional example shown in FIG. Since it is not necessary to use a dedicated motor M2 for rotating 7, it can be manufactured at low cost. Further, unlike the example shown in FIG. 4, there is no possibility that the rotation of the photoconductor 1 is adversely affected by the intermittent rotation of the roller 5 as in the case of rotating the cam 7 by the paper feed roller 15.

Further, since the reciprocating linear movement mechanism of the photoconductor 1 can be compactly arranged on one end side of the photoconductor 1, unitization is easy and the assembling property is good. Further, it can be easily assembled to an existing electrostatic photography device.

Further, in the above-described embodiment, since the support shaft 2 is configured to rotate integrally with the photoconductor, a current collector for connecting the heat retaining heater 20 in the photoconductor 1 to the external power source is, for example, as shown in FIG. Since it can be arranged at the end of the support shaft 2, there is an effect that the possibility of contact failure due to the axial movement of the photoconductor 1 as in the conventional case is eliminated.

[Effects of the Invention] As described above, according to the present invention, since the drum type photoconductor can be reciprocated in the axial direction by the rotational force of the drum type photoconductor, the reciprocating movement can be smoothly performed. In addition, the device can be downsized and the cost can be reduced. Furthermore, according to the present invention, the positioning member for the support shaft, the displacement means, and the second driving force transmission means can be attached to and detached from the recording apparatus main body as a unit, and
Since the drum type photoconductor can be attached and detached by passing through the opening where the positioning member of the support shaft is to be attached, the unit and the drum type photoconductor can be attached and detached with respect to the recording apparatus main body from the same direction. Therefore, the assemblability of the device and the operability of maintenance can be improved significantly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a photoconductor driving device to which an embodiment of the present invention is applied, FIG. 2 is a partial vertical cross-sectional view of a modified example thereof, FIG. 3 is a vertical cross-sectional view of a conventional example, and FIG. FIG. 6 is a longitudinal sectional view of a part of another conventional example. In the figure, 1 is a drum type photoconductor, 2 is its supporting shaft, M1
4 to 6 are photoconductor rotation drive mechanisms, 7 to 8 are cam mechanisms for linearly moving the photoconductor in the axial direction, and 16 to 8 are drive gears for the cam mechanisms.

Claims (1)

[Claims] 1. A recording apparatus for forming an image on a recording medium, comprising: a drum type photoconductor; a support shaft that supports the drum type photoconductor and rotates integrally with the drum type photoconductor; In order to support and attach the drum type photoconductor to the recording apparatus main body, a positioning member for a support shaft detachably attached so as to close an opening provided in the recording apparatus main body, a motor, and the drum type photosensitive body. A first driving force transmission means provided on one end side of the body for transmitting the driving force of the motor to the drum type photoconductor to rotate the drum type photoconductor; Displacement means on the other end side for reciprocating the drum type photoconductor provided in the centering member in the axial direction, and on the other end side of the drum type photoconductor for the support shaft. For positioning member A second driving force transmitting means for transmitting the rotational force of the drum type photoconductor to the displacing means in order to reciprocate the drum type photoconductor in the axial direction thereof. The positioning member for the support shaft, the displacement means, and the second driving force transmission means can be attached to and detached from the main body of the recording apparatus as a unit, and the drum type photoconductor should have the positioning member for the support shaft attached thereto. A recording apparatus, which is detachable by passing through an opening.