JPH01140169A - Bisecting type copying device - Google Patents

Abstract

PURPOSE:To facilitate maintenance and management, adjustment and repairing work by interposing a counterbalance mechanism, which operates when an upper main body is opened and closed within a prescribed angle and becomes inoperable when the body is opened over the angle, around a hinge joint part. CONSTITUTION:The counterbalance mechanism 37 energizing the upper main body 1 in its opening direction is provided around the hinge joint part 3. In case a recording sheet is jammed on a route from a cassette to a paper discharge part, a lock means 35 is turned to release a hook 36 from the rail 12a of the upper main body 1. By virtue of the action of the counterbalance mechanism 37, the main body is opened in a cram shell shape, centered on the hinge joint part 3, and a developing unit 5 is lifted together with the main body 1, whereby the space between a transfer part 9 and a photosensitive drum 6, all of which remain in a lower main body 2, and a paper route 13 are completely opened. To remove the upper main body 1 from the lower main body 2, the former 1 is lifted over the prescribed angle where the counterbalance mechanism 37 becomes inoperable. The work and reassembly are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a two-part copying apparatus that can be opened vertically in the form of a taram shell.

[Foreground of invention]

In general, a two-part copying device can be opened at the top and bottom like a taram shell, with the paper path leading from the paper feed section to the ejection section as the border, making it easier to remove jammed recording paper in the middle of the paper path, and for maintenance of the device. It is structured so that it can be easily managed, adjusted, and repaired.

Such a two-part copying apparatus usually has upper and lower bodies connected by a hinge at one side, and is spring-biased so that the upper body can be opened at a predetermined angle.

However, as conventional spring biasing means, a one-way torsion bar type or a gas spring type has been adopted, so the spring always appears to be in force when the upper body is opened. Therefore, during maintenance, adjustment, and repair work of the device, it is not easy to remove the upper body from the lower body or reassemble it unless the spring is released, resulting in poor work efficiency and serious problems.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problem.A spring acts on the normal opening and closing of the upper body, and when the upper body is removed from the lower body or reassembled during maintenance, adjustment, and repair work. It is an object of the present invention to provide a two-part copying device in which the action of a spring can be easily released.

[Structure of the invention]

In order to achieve the above object, the present invention provides a two-part copying device in which upper and lower bodies are hingedly connected at one side.
A counterbalance mechanism is installed near the hinge joint that acts when the upper body is opened and closed within a predetermined angle, but becomes inactive when opened beyond the angle, and is used for maintenance, adjustment, and repair work. It is designed to make it easier.

[Example] The present invention will be described below based on an example shown in the accompanying drawings.

In the figure, 1 is an upper body, and 2 is a lower body, and the upper body 1 and the lower body 2 are connected via a hinge joint 3 so that they can be opened in the shape of a taram shell. A document platen glass 1a is fitted onto the upper surface of the upper main body 1, and a document holding plate 1b is mounted thereon so as to be openable and closable.

Reference numeral 4 denotes an optical system installed in the upper main body 1. The optical system 4 includes a light source 4a that can move while irradiating a document placed on the document platen glass la, and a first light source unit 4a' fixed to the light source unit 4a'. It includes a mirror 4b, second and third mirrors 4C and 4d that bend the reflected light obtained by the first mirror, a variable magnification lens 4e, and a fourth mirror 4f.

Reference numeral 5 denotes a developing unit, and the developing unit 5 includes a photosensitive drum 6 in the outer housing 5a, a charging section 7, a developing section 8, a drum exposed section 9' corresponding to the transfer section 9, and a cleaning section 10.
are arranged. This developing unit 5 is connected to rails 12a and 1 provided on the lower surface of the bottom plate (bottom plate of the optical system) 11 of the upper body 1 via protrusions 5b and 5c provided on both sides of the outer casing 5a.
2b so that it can be pulled out toward the front side (operator side).

Note that the transfer section 9 is connected to the paper path 1 with respect to the photoreceptor drum 6.
They are installed on the lower body 2 so as to face each other with 3 in between.

14 is a cassette for storing recording sheets in a stack;
4 is attached to the lower space 2' of the lower body 2 so that it can be pulled out from the front side.

Reference numeral 15 denotes a paper feeding unit, and the paper feeding unit 15 feeds the recording paper sheets one by one from the cassette 14 to the paper path 13, between the half-moon roller 16, the photoreceptor drum 6, and the transfer section 9. It is provided with a second paper feed roller 17 for feeding paper and a guide roller 18, and has a manual feed tray 19 which is detachably attached to the outer surface of one side wall of the lower main body 2. A manual feed path 20 communicating with the manual feed tray 19 is provided with a manual feed roller 21 .

22 is a fixing unit that fixes the toner image by applying heat and pressure to the transferred recording paper in the transfer section 9; the fixing unit 22 has a fixing roller 24a, It includes a pressure roller 24b and a cleaning roller 25, as well as a paper ejection roller 26a.
, 26b. These paper ejection rollers 26a, 26b
The recording paper that has come out is stacked from the inner bottom surface 27 on the other side of the lower body 2 to the paper discharge tray 28 that is removably attached to the outer wall.

As shown in the second figure, the hinge joint 3 has a hole 31 provided in a protrusion 30 extending from the lower edge of one side of the front and rear skeletons 29 and 29' of the upper body 1, and a hole 31 provided in the front and rear skeletons 32 and 32 of the lower body 2. A hinge shaft 34 is installed horizontally in the same direction at both ends of the box-shaped member 33, which is connected between the two ends, and an annular groove ( (not shown)
A C ring (not shown) is fitted into the hole. Therefore, the upper body 1 can be easily removed from the lower body 2 and reassembled by simply removing the C-ring and moving it in one direction along the hinge axis.

Reference numeral 35 denotes a locking means for keeping the free end sides of the upper body 1 and the lower body 2 in a closed state.
A hook 36 is integrally formed on the upper edge of the rotating wall 2'. When the lower body 2 is in the closed state, the rotating wall 2' locks a hook 36 on the upper surface of the suspension rail 12a of the developing unit 5, which is bent into a hook shape at the edge of the bottom plate 11 of the optical system 4. The spring is biased in the direction of Further, the lower surface of the tip of the hook 36 is convex, and the upper surface of the rail 12a to which the hook 36 engages is formed concave, so that the hooks 36 engage with each other when engaged. In other words, the hook 36 cannot be easily removed from the rail 12a unless the upper body 1 is pressed slightly downward and the hook 36 is lifted off the upper surface of the rail 12a.

37 is provided near the hinge joint part 3 and is connected to the upper body 1.
The counterbalance mechanism 37 is a counterbalance mechanism that biases the upper body 1 in the opening direction, and the counterbalance mechanism 37 opens the upper body 1 by a predetermined angle (approximately 30°) as shown in FIG. It is designed to work. As shown in FIG. 4(a), this counterbalance mechanism 37 is constructed by a ball portion 39a provided at the base end of the bottom plate 38 of the box-shaped member 33, which is provided between the front and rear skeletons 32 and 32' of the lower body 2. It is composed of a pivotally mounted mandrel 39 and a compression coil spring 40 fitted to the mandrel, and the head end of the spring 40 is attached to a washer 42 that is engaged with a spherical portion (large diameter portion at the upper end) 41 fixed to the upper end of the mandrel 39. It is regulated. That is, when the upper body 1 is in the closed state as shown in the first figure, the upper end large diameter portion 41 of the mandrel 39
The washer 4 passes through a hole 44 provided in a corresponding portion of the reinforcing frame 43 passed between the projecting pieces 30, 30 constituting the hinge joint portion 3 and a hole 45 provided in the bottom plate 11 of the upper body 1.
2 is in contact with the reinforcing frame 43 to hold the compression coil spring 40 in a compressed state. Therefore, when the locking means 35 is released, the compression coil spring 40 pushes up the reinforcing frame 43 via the washer 42 due to its repulsive force, so that the upper body 1 is shaped like a taramusiel around the hinge joint 3 as shown in the third figure. It will be released. In this case, the maximum amount of expansion of the compression coil spring 40 is regulated by a washer 42 that is engaged with the large diameter portion 41 at the upper end of the mandrel 39, so that the upper body 1 can be expanded as shown in FIG.
It is maintained in the open state as in b) and is not opened any further. In other words, the counterbalance mechanism 37
only acts on the upper body 1 between the closed position in FIG. 4(a) and the open position in FIG. 4(b).
When the upper body 1 is raised as shown in FIG. 4(C), the head end of the compression coil spring 40 cannot follow this, so in this state, the upper body 1 is not affected by the spring at all. Therefore, in this state, the upper body 1 is connected to the lower body 2 by the hinge shaft 3.
4 in one direction, removing and reassembling work can be done very easily.

Note that the compression coil spring 40 is curved toward the hinge joint portion 3, but this is formed by curving the mandrel 39. When the compression coil spring 40 is bent in this way, the direction of the spring is aligned with the hinge joint part 3.
It matches the arc of the lower body 1 which rotates around , and the efficiency of the spring is improved. Furthermore, since the compression coil spring 40 lifts the upper body 1 together with the developing unit in the vicinity of the hinge joint 3, considerable strength is required; There is no need to increase the strength beyond what is necessary.

In the figure, reference numeral 46 denotes a pressure urging protrusion that presses the pressure roller 24b downward against the fixing roller 24a of the fixing unit 24 when the upper body 1 is closed, and escapes when the upper body 1 is opened, releasing the pressure between both rollers. . 47 is a cooling fan.

In the above embodiment, when the document set on the document table glass 1a of the upper main body 1 is pressed by the document presser plate 1b, the light source 4a of the optical system 4 moves, and the obtained document information is transferred onto the photoreceptor drum 5. The toner image is converted into a latent image and developed into a toner image in a developing section. On the other hand, the recording paper fed out from the force set via the half-moon roller and the second paper feed roller has a toner image transferred to it at the transfer section, fixed at the fixing section, and then discharged to the ejecting section.

The upper main body 1 has a locking means 35 in case the recording paper jams in the middle of the path from the cassette to the paper discharge section.
to release the hook 36 from the rail 12a of the upper body 1. As a result, the lower body 1 is opened in the shape of a taram shell around the hinge joint 3 by the action of the counterbalance mechanism 37. In this case, since the developing unit 5 is lifted together with the upper body 1, the paper path 13 is completely opened between the transfer section 9 remaining on the lower body 2 side and the photosensitive drum 6, as shown in the third figure. However, the fixing unit 22
The space between the fixing roller 24a and the pressure roller 24b is not released, but the state of pressure contact with each other is released. That is, the pressure urging protrusion 46 that presses the pressure roller 24b side downward when the upper body 1 is closed escapes when the upper body 1 is opened.

In addition, when removing the upper body 1 from the lower body 2 for maintenance, adjustment, and repair work, if the upper body 1 is raised above a predetermined angle at which the counterbalance mechanism becomes inactive,
The work becomes easy and reassembly is also easy.

In addition, in the above embodiment, an example was shown in which the compression coil spring 40 was used as the counterbalance mechanism 37, but
Of course, similar results can be obtained by using a helical spring.

〔Effect of the invention〕

As explained above, in a two-part copying device in which the upper and lower bodies are hingedly connected at one side, the present invention provides a function near the hinge joint when the upper body is opened and closed within a predetermined angle. However, since it is equipped with a counterbalance mechanism that becomes inactive when opening beyond this angle, a spring acts on the normal opening and closing of the upper body, making it easy to use during maintenance, adjustment, and repair work. When removing or reassembling the upper body from the lower body, the action of the spring can be easily released, the work can be carried out safely and easily, and it has the excellent effect of significantly improving work efficiency. be.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a schematic cross-sectional front view of the upper body when it is closed; FIG. 2 is a perspective view showing the upper body disassembled from the hinge joint; and FIG. A schematic cross-sectional front view when the upper body is opened, and FIGS. 4(a) to 4(C) are explanatory diagrams showing the action of the counterbalance mechanism. 1... Upper body 2 - Lower body 3 - Hinge joint 30 - Projection 31 - Hole 34 - Hinge shaft 37 - Counter balance mechanism 38 - Bottom plate 39 - Mandrel 4 (1--Compression coil spring 41-- Upper end large diameter portion 42--Washer Fig. 2

Claims (4)

[Claims] (1) In a two-part copying device in which the upper and lower bodies are hinged at one side, an actuator acts near the hinge joint to open and close the upper body within a predetermined angle. A two-part copying device characterized by being equipped with a counterbalance mechanism that becomes inactive when opened beyond the limit. (2) A patent in which the counterbalance mechanism is composed of a mandrel whose base end is pivotally connected to the lower body, and a compression coil spring whose head end is regulated by a washer that is engaged with a large diameter portion of the upper end of the mandrel. A two-part copying apparatus according to claim 1. (3) The two-piece copying apparatus according to claim 2, wherein the mandrel is provided with a curved portion with a concave portion on the side of the hinge joint. (4) The two-part copying device according to claim 1, wherein the hinge joint portion is configured to be detachable by moving the upper body relative to the lower body in one direction along the hinge axis. Device.