JPS6239837A - Moving body driving mechanism - Google Patents

Abstract

PURPOSE:To simplify the constitution by switching the power of one piece of driving motor by a time division by a clutch mechanism, and driving an optical unit and a lens unit. CONSTITUTION:In an operation period of a lens unit 56, a lens unit driving clutch 47 is turned on, and a driving force of a driving motor 41 is transmitted to a pulley 48 through gears 42, 46. A rotation of the pulley 48 is connected to a pulley 54 through a wire W2, and also connected to a movement of the lens unit 56 through a wire W3. Subsequently, in an operation period of an optical unit 100, when an optical unit driving clutch 44 is turned on, the driving force of the driving motor 41 is transmitted to a pulley 45 through gears 42, 43. A rotation of the pulley 45 is transmitted to optical unit driving pulleys 50, 51 through a wire W1, and a mirror unit 49 and a V mirror unit 53 are moved unitedly with the wire W1 in the direction as indicated with an arrow.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a moving body drive mechanism used for image formation in electronic copying machines, etc., and more specifically, to an image forming apparatus with a simplified structure of the moving mechanism. This invention relates to a moving body drive mechanism.

(Prior Art) An electronic copying machine exposes a charged photosensitive drum to light according to document information, and then a static image is formed on the drum surface. This is a device that forms a visible toner image on the U latent image and transfers the visible toner image onto recording paper.

In recent years, this type of electronic copying machine has been widely used for copying information in all fields of industry. Recent electronic copying machines are commercially available that not only automatically copy a preset number of copies, but also have a zoom function for enlarging and reducing images.

FIG. 3 is a diagram showing an example of the configuration of a conventional electronic copying machine of this type. When the operator presses a copy start button (not shown), the device (not shown) starts a copying operation. The photosensitive drum 1, which is rotating in the direction of the arrow, is cleaned by a blade in the cleaning section 2, after which the residual toner on the drum is scraped off by a blade, and then corona discharge is performed by the charging electrode 3, so that the electric charge of the seeds is applied to the entire surface of the drum. Becomes electrically charged.

The charges charged by the charging electrode 3 are transferred to a charge erasing section 4.
The charges in unnecessary parts are erased. Thereafter, the charged area of the photosensitive drum 1 is exposed to an optical image signal, and an electrostatic latent image of the original image is formed on the drum surface. That is,
Light is irradiated onto the original 6 from the exposing unit 5 which is slidable in the direction of the arrow shown in the figure, and the reflected light containing the original information is transmitted to the photosensitive drum 1 via the optical unit and optical lens L shown in the figure. Expose the drum surface. In this way, the document is read by the reading section R comprising the optical unit 20, the optical lens L, etc., and the information is immediately recorded on the photosensitive drum 1 as an electrostatic latent image. The electrostatic latent image formed on the drum surface is converted into a visible image by adsorbing toner in the subsequent developing section 7. The toner image on the drum surface is transferred to recording paper (copy paper) in a transfer section 8, and the recording paper that is in close contact with the photosensitive drum 1 is separated. The separated recording paper is sent to the fixing roller 10 via the conveyance mechanism 9, and the recording paper is heated and pressurized by the fixing roller 10, and the toner on the recording paper is fused to the recording paper, and the copying operation is completed. .

Here, the exposure section 5 and mirrors M1, M2, M3
The parts (encircled by broken lines) constitute optical units 1 to 20, and include a first moving mechanism (not shown).
This allows you to move in the direction of the arrow in the figure. Further, the optical lens L can be moved in the direction of the arrow in the figure by a second moving mechanism (not shown) when varying the zoom magnification. Here, in order to always keep the optical path length constant, the first mirror M1 and the exposure section 5
Second and third mirrors M2. It moves at twice the speed of M3. The light passing through the optical unit 20 is
The light is irradiated onto the surface of the photosensitive drum 1 through the optical lens [-]. The light source 21 in the exposure section 5 has a narrow shape (
For example, since the optical unit 20 has a fluorescent light, it can scan the original 6 two-dimensionally. This optical unit 20 moves by being given a driving force from a driving source (not shown). A drive signal is input to the drive source from the outside to drive the drive source.

In such an electronic copying machine, the magnification ratio for the zoom function of the electronic copying machine having a zoom function is, for example, about 0.7 to 1.3 times. FIG. 4 is an explanatory diagram of the variable magnification mechanism. Components that are the same as those in FIG. 2 are indicated with the same numbers or symbols. In the zoom mechanism configured as described above, the optical lens L is placed at the position A and the fourth mirror M4 is placed at the position B when the magnification is equal to the magnification, and moves in the direction B' when changing the magnification. The magnification of the image is as follows: the optical distance from the position to the document 6 is 1!1. Similarly, if the optical distance from the position A to the surface of the photosensitive drum 1 is 12, then /
It is expressed as 2//1. Therefore, when enlarging an image, the optical lens L is placed at the position A' to reduce the optical distance 41, and when reducing the image, the optical lens L is placed at the position of Δ''.
to increase the optical distance 11.

In the zoom operation described above, for example, a drive motor is used as a drive source for moving the optical lens L or the fourth mirror M4, and the rotational power of the drive motor is transmitted to a drive transmission mechanism such as a gear, a pulley, or a wire. By transmitting the signal, a movable object such as an optical lens is moved.

(Problems to be Solved by the Invention) In a conventional device of this type, as shown in FIG.
1.32, the configuration was complicated. By the way, the first drive motor 31 that drives the optical unit 20 and the second drive motor 32 that drives the optical lens L are not operated at the same time. 1IIt5,
The optical operation of scanning the original 6 and the operation of moving the optical lens L depending on the zoom magnification are never performed at the same time.

The present invention has been made in view of these points, and
Its purpose is to drive the optics] knit 20 and optical lens 1.
The object of the present invention is to realize a moving body drive mechanism whose configuration is simplified by sharing a source.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, has a reading section that scans and reads document information using an optical unit, and the reading section has an optical zoom function. This is a movable body drive mechanism used for forming and purchasing equipment, and is characterized in that it is configured so that a common drive motor drives an optical unit and a zoom optical lens.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a mechanical configuration diagram showing an embodiment of the present invention.

In the figure, 41 is a drive motor, and 42 is the drive motor 4.
This is a drive motor gear (gear) that is directly connected to the rotating shaft of No. 1. As the drive motor 41, for example, a stepping motor (also referred to as a pulse motor) is used. 43 is an optical unit drive gear that meshes with the drive motor gear 42; 44 is an optical unit drive clutch that transmits the rotational force of the optical unit drive gear 43 to the rotating shaft; and 45 is an optical unit drive pulley attached to the rotating shaft of the gear 43. It is.

46 is a lens unit drive gear meshing with the drive motor gear 42; 47 is a lens unit [-drive clutch; 47 is a lens unit that transmits the rotational force of the lens unit drive gear 46 to the rotating shaft;
Reference numeral 8 denotes a lens unit drive pulley attached to the rotating shaft of the gear 46. 49 is an optical unit drive pulley 45
Reference numerals 50 and 51 designate optical unit drive booms around which optical unit wires Wl are wound, respectively, to the mirror unit 1 attached to the optical unit wires W1 wound around the mirror unit 1. One end of the wire A7W1 is fixed to a support (not shown), and the other end is fixed to the support (not shown) via a spring 52. 53 is a V mirror unit attached to the rotation shaft of the optical unit drive pulley 50. The mirror unit 49 and the V mirror unit 53 are optical units)
100 is formed.

Reference numerals 54 and 55 are lens unit drive pulleys constituting the lens unit drive system, and 56 is a lens unit drive pulley. A wire W2 is wound between the lens drive pulleys 48 and 54, and a wire W3 is wound between the lens unit drive pulleys 54 and 55. Therefore, the lens 1 unit 56 is attached to the wire W3. The operation of the device configured as described above will be explained as follows.

71 As described above, the present invention focuses on the fact that driving the optical lens (lens unit) and driving the optical unit are not performed at the same time, and uses a clutch to switch the driving force of the same drive motor to drive the lens unit and drive the optical unit. The optical unit is driven in a time-division manner.

FIG. 2 is a diagram showing an operation sequence of the apparatus shown in FIG. 1. In the figure, (a) is the drive motor 41, (b)
(c) shows the operation sequence of the optical unit drive clutch 44, and (c) shows the operation sequence of the lens unit drive clutch 47, respectively. TA indicates the operating period of the lens unit 56, and TB indicates the operating period of the optical unit 100.

As is clear from the operation sequence in FIG. 2, during the operation period TA of the lens unit 56, as shown in FIG. is transmitted to the lens unit drive pulley 48 via gears 42 and 46. This connection causes the lens unit drive pulley 11.8 to rotate via the wire W2. I and rotates the pulley 54. When the pulley 54 rotates, the wire W3 moves, and the lenses 1 to 56 attached to the wire W3 also move together in the direction of the arrow.

Next, during the operation period To of the optical unit 100,
As shown in FIG. 3(b), first, each lens unit drive clutch 47 is turned off, and the optical units 1 to 44 are turned on. The driving force of the drive motor 41 is then transmitted to the optical unit drive pulley 45 via gears 42 and 43.

In this connection, the optical unit I to the drive pulley 45 are rotated via the wire W1 to the optical unit drive pulley 50°51.
, the mirror units 1 to 49 and the V mirror unit 53 move in the direction of the arrow in unison with the wire W1. As described above, according to the present invention, the power of one drive v1 motor can be switched in time division by the clutch mechanism and used for driving the optical unit 100 and the lens unit 56.

In the above description, an example has been described in which an optical unit and two optical lenses are driven in a time-sharing manner as a moving body. However, the present invention does not need to be limited to driving two moving bodies (as long as they are configured to move on a time-sharing basis, a common drive motor can be used as a power source,
Three or more moving objects can be driven by applying power to each moving object in a time-divided manner. The power switching mechanism also does not need to be a clutch. Furthermore, although the case has been described in which the moving optical unit is an exposure system and a lens system, it may be an optical unit in which a document table is moved. Further, in the above description, the driving mechanism of a movable body used in an electronic copying machine was explained as an example, but the present invention is not limited to this, and the movable body driving mechanism used in other image forming apparatuses may be used.

(Effects of the Invention) As described in detail above, according to the present invention, the power of one drive motor is switched in a time-sharing manner by a clutch mechanism to drive an optical unit and a lens unit. can be simplified. Therefore, according to the present invention, the cost of the device can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a mechanical configuration diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the operation sequence of the present invention, Fig. 3 is a diagram showing an example of the conventional configuration of an electronic copying machine, and Fig. 4 is a zoom diagram. FIG. 5, which is an explanatory diagram of functions, is a diagram showing an example of a conventional configuration of an optical unit. 1... Photosensitive drum 2... Cleaning section 3...
・Charged electrode 4... Charge erasing section 5... Exposure section
6... Original 8... Transfer unit 9... Conveying mechanism 10... Fixing roller 20... Optical unit 21... Light source
41... Drive motor 42... Drive motor gear 43... Optical unit drive gear 44... Optical unit drive clutch 45... Optical unit pulley 46... Lens unit drive gear 47... Lens unit drive Clutch 48...Lens unit drive pulley 49...Mirror unit 53...V mirror unit 56...Lens unit 100...Optical unit W+-Ws...Wire Patent applicant Konishiroku Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 1 person 6' Figure 5 20 ``Meeting■1〒≧+Cho2---En=〒q-4'':, 1; Photosensitive drum 6i R; Reading Part m-. 1i 111 drum 6; original 20i optical unit

Claims (2)

[Claims] (1) A movable body drive mechanism used in an image forming apparatus that has a reading section that scans and reads document information using an optical unit, and the reading section has an optical zoom function, the moving body drive mechanism being used for driving the optical unit and zooming. A moving body drive mechanism characterized in that an optical lens is driven by a common drive motor. (2) The movable body drive mechanism according to claim 1, wherein a stepping motor is used as the drive motor.