JPS63138360A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the need to constitute a coupling mechanism for precluding a defect in the engagement of an interlock gear and to simplify the constitution of an image forming device by providing the interlocking rotary member of one driving system concentrically with the center of rotation of an upper unit. CONSTITUTION:The interlocking rotary member 61 of at least one driving system 6 between interlocking rotary members 61 and 71 which interlock the driving system 6 of the upper unit 1a with the driving system 7 of a lower unit 1b is provided concentrically with the center O of rotation of the upper unit 1a. Consequently while the interlocking rotary members 61 and 71 for the driving system 6 of the upper unit 1a and the driving system 7 of the lower unit 1b are held integrally without being separated, the upper unit 1a is opened and closed, so the need to constitute the coupling mechanism for precluding a defect in the engagement between the interlocking gears 61 and 71 is eliminated and the structure of the driving systems is simplified.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an image forming apparatus, and more specifically,
The present invention relates to a gram shell type image forming apparatus in which an upper unit is rotatably connected to a predetermined portion of a lower unit.

<Prior Art> Conventionally, in image forming apparatuses such as copying machines and facsimile machines, the main body of the copying machine is divided into an upper unit and a lower unit for convenience such as toner replacement, jam removal, and other inspection and maintenance. In order to make the upper unit openable and closable, there is a so-called gram shell type in which the upper unit is rotatably connected around a predetermined fulcrum.

In such a Talam shell-shaped image forming device,
Since the drive system is divided into the upper unit side and the lower unit side, in order to link the drive systems of both units,
Interlocking gears that mesh with each other are provided separately on the upper unit side and the lower unit side.

<Problems to be Solved by the Invention> In the image forming apparatus having the above configuration, when the upper unit is released, the meshing between the interlocking gears is temporarily released, so when the upper unit is closed again, , the interlocking gears may not mesh well with each other, resulting in teeth skipping, missing gears, etc. Therefore, in the gram shell type image forming apparatus, in order to prevent the above-mentioned disadvantage from occurring, it is necessary to specially configure a gear coupling mechanism that allows the interlocking gear to freely move (for example, as disclosed in Japanese Patent Laid-Open No. 59-100459). ), there was a problem that the structure became complicated.

<Purpose> This invention was made in view of the above problems,
It is an object of the present invention to provide an image forming apparatus that does not require a connecting mechanism for preventing a failure of interlocking gears and can simplify the structure.

Means for Solving the Problems> To achieve the above object, the image forming apparatus of the present invention includes at least one of the interlocking rotating members that interlock the drive system of the upper unit and the drive system of the lower unit. An interlocking rotating member of one of the drive systems is provided concentrically with the rotation center of the upper unit.

However, in the drive system mentioned above, a predetermined part of the transmission member of the drive system is elastically biased with tension so as to absorb rotational displacement caused by opening and closing of the upper unit. Good too.

In the image forming apparatus having the above configuration, when the upper unit is opened and closed, the interlocking rotating member, which is provided concentrically with the rotation center of the upper unit, rotates about the rotation center of the upper unit. Or it can be rotated. More specifically, for example, if the interlocking rotation member on the upper unit side is provided concentrically with the rotation center of the upper unit, when the upper unit is opened and closed, the interlock rotation member and the lower unit side With the rotating member connected,
The interlocking rotating member on the upper unit side can be rotated about the rotation center, and when the interlocking rotating member on the lower unit side is provided concentrically with the rotation center of the upper unit. The interlocking rotating member on the upper unit side can be made to revolve around the rotation center in a state where the interlocking rotating member and the interlocking rotating member on the upper unit side are connected. In addition, when both the interlocking rotating member on the upper unit side and the interlocking rotating member on the lower unit side are provided so as to be rotatable concentrically and integrally with the rotation center of the upper unit, when opening and closing the upper unit, Both of the interlocking rotation members can be rotated about the rotation center.

Therefore, it is possible to open and close the upper unit while maintaining the integrity of the pair of interlocking rotating members provided at the connection between the drive system of the upper unit and the drive system of the lower unit without separating them. There is no need to construct a coupling mechanism for preventing misalignment of the interlocking rotating members.

In particular, when a predetermined portion of the transmission member of the drive system is elastically biased by tension, the rotational displacement of the drive system due to opening and closing of the upper unit is caused by the expansion and contraction action of the transmission member. It is possible to prevent the entire drive system from rotating when the upper unit is opened and closed.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 2 is a schematic diagram showing the internal structure of a copying machine as an image forming apparatus of the present invention.

In the copying machine, the main body (1) is divided into an upper unit (1a) and a lower unit (lb).
) is of a gram shell type rotatably connected to the lower unit (lb) via a support shaft (0), and is provided with a document mounting table (11) having a document holding plate on the top surface. In addition, a manual paper feed section (12) and a removable paper feed cassette (13) are provided at the bottom of the right side, and a paper (P) that has been copied is supported at a predetermined position on the left side. The receiver is provided with a plate (14). Then, a partition plate (
15), the upper chamber (1B) and lower chamber (
17) is formed, an optical system (2) capable of reciprocating movement is provided in the upper chamber (16), and a copy processing unit] 3) is provided in the lower chamber (17). Ori,
Additionally, the upper unit (la) and lower unit (lb)
A paper conveying section (5) is provided along the boundary between the two.

The optical system (2) includes a light source (2) formed by a light emitter (21) and a reflecting mirror (21') having a curved reflecting surface.
0), first reflecting mirror (22), second reflecting mirror (23), third reflecting mirror
It consists of a reflecting mirror (24), a condenser (26) consisting of a lens, etc., and a fourth reflecting mirror (25). Of these, the light source (20) reciprocates once for each copying operation. Unfazed,
This makes it possible to sequentially scan and expose the original (not shown) on the original placing table (11), and the reflected light from the original is reflected by the first reflecting mirror (22) that moves in accordance with the movement of the light source (20).
The photoreceptor drum (3), which will be described later, passes through slits (27) formed at predetermined positions of the third reflecting mirror (24), the condenser (26), the fourth reflecting mirror (25), and the partition plate (15).
0> surface is irradiated.

The copying processing section (3) is provided with a photosensitive drum (30) that rotates in one direction (direction of arrow A in the figure) for each copying operation, and around the photosensitive drum (30),
A charging charger (31), a developing device (32), a transfer charger (33), a peeling charger (34), and a toner recovery device (35) are provided in this order. Therefore, the photosensitive drum (30) is charged by the charger (31).
) After uniformly charging the photoreceptor layer, the slit (27)
An electrostatic latent image corresponding to the original is formed by light irradiated through the document, toner is adsorbed by a developing device (32) to form a toner image, and then a registration roller (53), which will be described later, is generated by a transfer charger (33). The toner image is transferred onto the paper (P) fed from the peeling charger (34).
The paper (P) is peeled off from the photoreceptor drum (30) by the toner collecting device (35), and the toner remaining on the photoreceptor drum (30) is finally collected by the toner collecting device (35), thereby making it possible to perform one copying process. . In addition, the developing device (32)
Inside the developer housing (36) is a magnetic brush mechanism (36).
7), a developer stirring mechanism (38) (3g) and a panicle length setting member (39) are provided, and a conveyor (40) is connected to the upper part of the developer housing (36).
A toner particle replenisher (42) having a toner particle replenishment roller (41) and the like is provided.

The paper transport unit (S) includes a paper feed roller (51) that feeds paper (P) from a manual paper feed table (12) to a registration roller (53), and a paper feed roller (51) that feeds paper (P) from a cassette (13). A paper feed roller (52) that counts each sheet and feeds it to the registration roller (53), a registration roller (53) that feeds the paper (P) to the copy processing section (3), and a copy processing section ( a conveyor (54) that conveys the paper (P) peeled from 3);
A heating and fixing roller (55) heats and fixes the toner image on the paper (P)l, and a tray (14) holds the paper (P) after heating and fixing.
), and by selectively driving the paper feed rollers (51) and (52), the paper (P) is fed from the manual paper feed tray (I2). ) or the paper (P) from the cassette (13) can be fed one by one.

FIG. 1 is a schematic diagram showing the drive system of the copying machine as seen from the rear, and shows the first drive system (6) on the upper unit (1a) side.
) and a second drive system on the lower unit (1b) side. The second drive system port serves as a feed roller (51) (52).
, lens i roller (53), conveyor (54), heat fixing roller (55), etc. The first drive system (6) is driven by a motor (not shown), and the second drive system port connects a pair of interlocking gears (61) (71) as interlocking rotating parts. The first drive system (6) is connected to the first drive system (6) via the first drive system (6). Further, the interlocking gear (61) of the first drive system (6) is connected to the upper unit (l
It is provided concentrically with the support shaft (0) as the rotation center in a).

With the above configuration, when the upper unit (La) is opened and closed, the interlocking gear (61) can be rotated about the support shaft (0) as the center of rotation of the upper unit (1a). Therefore, the upper unit (la) can be opened and closed while the interlocking gears (61) and (71) are in mesh with each other.
) can eliminate the need for a connecting mechanism to prevent defects in biting into each other.

FIG. 3 is a corner schematic diagram showing another embodiment, in which the interlocking gear (71) of the second drive system (7) is connected to the upper unit (l).
It is provided concentrically with the support shaft (0) as the center of rotation in a). In this embodiment, when opening and closing the upper unit (1a), the interlocking gear (61) is connected to the support shaft (61) in a state where the interlocking gear (71) and the interlocking gear (61) are in mesh with each other.
0).

Furthermore, as shown in Figure 4, each drive system (6) (7)
Connect both interlocking gears (+31) (71) to the support shaft (0).
It can also be implemented by providing it so that it can rotate concentrically and integrally with the
In this case, both speed gears ([1l) (71) can be rotated integrally around the support shaft (0).

Also in the above embodiment, since at least one of the interlocking gears (81) and (71) is rotated as the upper unit (1a) is opened and closed, the first drive system (6) and the second drive system are rotated.
At least one of the drive systems (7) is rotated as a whole. FIG. 5 shows such an upper unit (la
) shows an example that can prevent the interlocking of the drive systems (6) (7) due to the opening and closing of the drive systems (6) (7).
A conductive member (62) consisting of a chain, belt, etc.
(72) with tension (83) (73)
They are each elastically biased. The tension (83) (73) is applied to the transmission member (83) (73) when the interlocking gear (81) (71) moves forward or backward.
2) At least one pair is provided for each drive system (6) (7) so that the tension side of (72) can be extended. Also, the amount of expansion and contraction of the conduction member (82) (72) is Interlocking gear for opening and closing of unit (1a) <61)
(71) is set within a range that can absorb at least the amount of displacement. With the above configuration, the rotational displacement of the drive system (6) [7] accompanying the opening and closing of the upper unit (la) is absorbed by the expansion and contraction action of the transmission members (82) and (72), and the Since almost the entire drive system [6] (71) can be maintained in an immobile state, opening/closing resistance from the drive system (6) (7) is prevented when opening and closing the upper unit (la). be able to. That is, the upper unit (la)
can be opened and closed with a light load.

Of course, the present invention can be applied to other gram shell type image forming apparatuses other than the above-mentioned copying machine, such as facsimiles. ) Various design changes can be made without changing the gist of the invention, such as configuring it with sprocket wheels other than those linked with a chain.

<Effects of the Invention> As described above, the present invention enables the opening and closing of the upper unit while always maintaining the integrity of the rotating members for interlocking the drive system of the upper unit and the drive system of the lower unit without separating them from each other. Therefore, there is no need to construct a coupling mechanism for preventing misalignment of the interlocking gears, and the unique effect is that the structure of the drive system can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a drive system of an image forming apparatus according to the present invention, FIG. 2 is a schematic diagram showing the internal structure, and FIGS. 3 to 5 are schematic diagrams showing main parts of other embodiments. (la)...upper unit, (1b)...lower unit (6)...drive system on the upper unit side, (7)...
- Drive system on the lower unit side, (81) (71)... Interlocking gear as an interlocking rotating member, (0)... Support shaft as the center of rotation of the upper unit, (82) (72)・
...Conduction member, (G3) (73)...Tension. Figure 3 to Figure 4

Claims (1)

[Claims] 1. The upper unit is a designated part of the lower unit The graph is rotatably connected to the In a Muschel type image forming device, the upper The drive system of the lower unit and the drive system of the lower unit Rotating member for interlocking with dynamic system The interlocking rotation of at least one of the drive systems The rotating member is the same as the center of rotation of the upper unit. A picture characterized by being set in the mind Image forming device. 2. The drive system is activated as the upper unit opens and closes. The drive is designed to absorb rotational displacement. A predetermined part of the conduction member of the dynamic system is under tension. The above-mentioned patent application is elastically biased. The image forming apparatus according to claim 1.