JPS6035813Y2 - Opening/closing devices for copying machines, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an opening/closing device for a copying machine that is required for inspecting paper jams, etc. in a copying machine, and for opening/closing objects during maintenance.

Conventionally, objects to be opened and closed during inspection and maintenance of copying machines, etc. are heavy and difficult to keep open, so hinges using torsion springs, etc. are used on the rotating shaft. However, it required a large space near the rotation axis, and the spring of the hinge device was difficult to design, so it was limited to specific uses.

In addition, if a hinge is not used as described above, a damper such as a gas spring or an oil spring is interposed between the object to be opened and closed and the main body at a position away from the rotation axis. Springs, etc. are prone to gas and oil leaks, and sealing technology to prevent this is difficult, resulting in high costs and low reliability.

Further, gas springs, oil springs, etc. have drawbacks such as difficulty in setting the opening/closing force because the spring characteristics change due to temperature changes.

This idea was made in view of the circumstances mentioned above,
A copier opening/closing device that uses a spring balancer with a coil spring that can be easily installed even when there is no space around the rotating shaft of the object to be opened and closed, and is configured to reduce the impact force at the maximum opening position of the object to be opened and closed. It provides:

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a spring balancer 1 according to this invention in use, where 2 is a main body and 3 is an object to be opened and closed.

The spring balancer 1 is pivotally mounted at a predetermined position of the main body 2 and the object 3 to be opened/closed at a predetermined position apart from the rotating shaft 4 by means of fulcrums 5a and 5b.

In this case, the case where the supporting points 5a and 5b are set to be located on a line substantially perpendicular to the dividing line between the main body 2 and the object to be opened and closed 3, as shown in FIG. 1A, is called a direct type. As shown in Figure 1, the case where the fulcrum 5b of the object 3 to be opened and closed is set somewhat offset from the vertical line in the direction of the rotation axis 4 or in the opposite direction with respect to the fulcrum 5a of the main body 2 is called an oblique type.

Depending on the relationship between the set positions of the fulcrums 5a and 5b, the balancer 1 exhibits the following operational differences.

That is, the direct type has a smaller difference in deflection and a larger difference in load than the oblique type, and the spring used is required to have a larger spring constant than the latter.

As shown in FIG. 2, the structure of the first embodiment of the spring balancer 1 is such that one end of a rod 7 is fixed to a bracket 6a that is pivotally attached to the main body 2. One end of the sliding cylindrical body 8 is fixed to a bracket 6b that is pivoted to the side of the object 3 to be opened and closed.

The lengths of the cylindrical body 8 and the rod 7 are determined by the minimum and maximum expansion and contraction distances between the main body 2 and the fulcrums 5a and 5b of the object to be opened and closed. A guide cylinder 8a is tightly inserted when the slider 9 comes into guide sliding contact.

Further, a friction ring 10 formed of an elastic material is fitted into the insertion opening of the rod 7 among the openings at both ends of the cylindrical body 8 in order to apply a predetermined friction to the sliding contact of the rod 7.

On the other hand, a coil spring 11 having a predetermined stress is installed between the brackets 6a and 6b at both ends of the cylindrical body 8 into which the rod 7 is fitted, and has a balancer effect when the object 3 to be opened and closed is opened and closed.

The coil spring 11 is attached to the outer periphery of the cylindrical body 8, and has a large diameter portion 11a corresponding to the telescopic portion of the rod 7.
and a small diameter portion 11 attached corresponding to the outer peripheral portion of the rod 7.
It is an integrally molded coil spring consisting of two parts b, which effectively prevents buckling due to deflection of the coil spring 11, and also prevents interference with the rod 7 and other parts due to buckling. .

Figure 3 shows the second spring balancer 1 according to this invention.
FIG. 2 is a longitudinal sectional view showing an example of the coil spring 12
is formed to have a diameter corresponding to the outer circumference of the cylindrical body 8,
Coil spring 12 from bracket 6a on rod 7 side
The guide tube 13 is molded to have an inner diameter into which the outer diameter portion of the guide tube 13 fits.
extends to the cylindrical body 8 and is attached thereto.

Therefore, buckling due to compressive deflection of the coil spring 12 is guided and restrained by the guide cylinder 13, so that even if the difference in deflection of the coil spring 13 is large, a sufficient buckling prevention effect is exhibited.

In the above two embodiments, preferably, the first embodiment is used as a direct type, and the second embodiment is preferably used as an oblique type.

As described in detail above, when the spring balancer 1 according to the present invention is used in an opening/closing device such as a copying machine, it can be easily installed at a predetermined position away from the rotating shaft 4 of the object 3 to be opened and closed.

Therefore, according to the spring balancer 1, by appropriately setting the characteristics of the coil spring 11 or 12 and setting the friction ring 10 at the sliding contact portion between the rod 7 and the cylindrical body 8, the opening/closing assisting force for the object 3 can be Not only can it be used, but when the object 3 is closed, the spring balancer 1 can automatically open the object 3 to a predetermined opening degree by releasing the lock and set the object 3 to a state in which balance is maintained.

This is because the stress on the spring balancer 1 is greater than the rotational moment of the object 3 to be opened and closed, and balance is maintained when the spring balancer 1 stretches to a certain extent and balances the rotational moment of the object 3 to be opened and closed. , the opening beyond this can be fully opened by applying a slight force.

Also, when closing the object 3 that is in equilibrium at a predetermined opening degree, the rotational moment of the object 3 is only slightly large due to the deflection stress of the spring balancer 1, so a small amount of force is required. Since it closes just by applying the force, there is no impact movement in either direction, allowing stable opening and closing.

In other words, since the spring balancer described above can change the settings of the characteristics of the coil spring and the settings of the friction ring, it can adjust the opening degree of the object to be opened and closed to the desired degree based on the moment characteristics of the object to be opened and closed. It has a simple structure and can be manufactured at low cost.

Furthermore, unlike conventional products, there is no gas leakage or oil leakage, and a highly reliable balancer effect and damper effect with no characteristic changes due to temperature differences can be obtained, and other practical effects are achieved.

Furthermore, according to the present invention, since both ends of the cylinder into which the rod is inserted and removed are open, the stroke is not restricted in any way even during a large operating stroke in which the rod penetrates the cylinder, and no sealed chamber is formed within the cylinder. Therefore, the opening/closing operation has the advantage that the operating force does not change depending on the speed (the faster the opening/closing operation is done, the heavier the operating force becomes) and the opening/closing operation can always be performed with a constant operating force.

[Brief explanation of the drawing]

Figure 1 A9 is a side view of a copying machine etc. that implemented this invention.
FIG. 2 is a longitudinal sectional view of a spring balancer showing one embodiment of this invention, and FIG. 3 is a longitudinal sectional view of a spring balancer showing another embodiment of this invention. 1...Spring balancer, 2...
Main body, 3...Object to be opened and closed, 4...Rotating shaft, 5a, 5b...Fully point, 6 at 6 b"
"" Vracket, 7...Rod, 8...
・Cylindrical body, 9...Slider, 10...
・Friction ring, 11... Coil spring, 1
2... Coil spring, 13... Guide tube.

Claims (1)

[Scope of utility model registration request] A rod fixed to a bracket at one end, a cylindrical body with openings at both ends fixed to another bracket at one end, and a friction plate fixed to the opening at one end of the cylindrical body so as to guide and slide the rod into the cylindrical body with a predetermined frictional force. A spring balancer is constituted by a ring and a coil spring interposed between the two brackets, and the spring balancer connects the main body and the object to be opened and closed at a predetermined position away from the rotation axis of the object to be opened and closed via the two brackets. An opening/closing device for a copying machine, etc., characterized in that it is pivotally mounted between.