JPH064356Y2 - Opening and closing mechanism of clam shell type copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a clamshell type copying machine, and more particularly, to an opening / closing mechanism in which an upper frame is opened and biased by a torsion bar.

[Conventional technology]

The conventional opening / closing mechanism of the clamshell type copying machine includes one using a gas spring, a compression spring, a torsion bar, or the like. In particular, in a clamshell type copying machine that is downsized and lightened, one that uses a torsion bar as an opening / closing mechanism is generally used because of operability including jam clearing. In the conventional opening / closing mechanism using the torsion bar, the torsion bars are provided on both sides of the rotating shaft of the upper frame in order to move the both sides up and down in parallel to the opening / closing axis.

[Problems to be Solved by the Invention] As described above, the conventional opening / closing mechanism using the torsion bar is disadvantageous in cost because it uses two torsion bars.

[Means and Actions for Solving the Problems]

The present invention has been conceived in view of the above, and by using one torsion bar, the frame can be urged substantially uniformly in the opening direction on the back side and the front side in the front-rear direction of the frame. The present invention is intended to provide an opening / closing mechanism of a clamshell type copying machine capable of reducing the cost of the above. The structure is such that the above frame is supported by a hinge pin so that the frame can be opened / closed with respect to the lower frame. In the opening / closing mechanism of a clamshell type copying machine in which a torsion bar applies an urging force to the upper frame in the opening direction, brackets are fixed to both ends of the hinge pin, and both brackets are fixed to the upper frame. Department,
A torsion bar including a base end portion bent downward with respect to the middle portion and a tip end portion bent upward with respect to the middle portion is provided along the lower frame with the middle portion and the base end portion thereof. In addition, the tip portion is configured to engage with one of the two brackets, and one of the rear and front brackets of the copying machine in the opening direction by the torsion bar The urging force acts, and this urging force in the opening direction is transmitted to the other bracket through the hinge pin, and one torsion bar passes through both brackets in the opening direction on both the back side and the front side of the frame. Is evenly biased.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 is a clamshell type copying machine.
Is composed of a lower frame 2 and an upper frame 3. Of these, the lower frame 2 includes a photoconductor, a developing unit, a transfer unit, a paper feeding unit, a transport unit, a fixing unit, and the like, and the frame 3 includes an optical system and It is equipped with a scanning unit. The upper frame 3 is openably and closably supported by the hinge pin 4 at the right end of the lower frame 2.
The latch mechanism 5 is engaged in the closed state. The upper frame 3 is biased in the opening direction by a single torsion bar 6.

An opening / closing mechanism including a support structure for the pivotal support portion of the upper frame 3 and the torsion bar 6 will be described with reference to FIG.

The bases of the brackets 7a and 7b are fixed to both ends of the hinge pin 4, and the brackets 7a and 7b are fixed to the upper frame 3. The fixing means of the hinge pin 4 and the brackets 7a and 7b is configured to engage in notch coupling, serration coupling and the like in the rotational direction.

The torsion bar 6 includes an intermediate portion 6a, a base end portion 6b that is bent downward in an L shape with respect to the intermediate portion 6a, and a tip portion 6 that is bent upward in an L shape with respect to the intermediate portion 6a.
It consists of c and the middle part 6 of this torsion bar 6.
a is held inside the lower frame 3 in parallel with the hinge pin 4, the base end 6b is in contact with the inner surface of the lower frame 3, and the end of the tip 6c is provided at the tip of one bracket 7a. Is engaged with the slot 8.

In the above structure, the opening direction urging force of the torsion bar 6 acts on one of the two brackets 7a, 7b fixed to the hinge pin 4, and the opening direction urging force is applied to both the brackets 7a, 7b. Are fixed to the hinge pin 4 respectively, and are transmitted to the other bracket 7b through the hinge pin 4, and the one torsion bar 6 causes both the brackets 7a and 7b to move.
Is urged upward in a unitary manner via.

Therefore, the upper frame 3 fixed to both the brackets 7a and 7b also has substantially the same biasing force in the opening direction by the one torsion bar 6 on the front and rear sides thereof in the front-rear direction.

[Effect of device]

According to the present invention, the upper frame 3 can be biased in the opening direction substantially evenly on the rear side and the front side of the upper frame 3 by using one torsion bar 6, and the cost of the opening / closing mechanism can be reduced. be able to.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view showing an essential part of the present invention, and FIG. 2 is a schematic configuration explanatory view of a clamshell type copying machine. Reference numeral 2 is a lower frame, 3 is an upper frame, 4 is a hinge pin, 6 is a torsion bar, 6a is an intermediate portion, 6b is a proximal end portion, 6c is a distal end portion, and 7a and 7b are brackets.

Claims (1)

[Scope of utility model registration request] 1. A clamshell copying machine in which an upper frame 3 is supported by a hinge pin 4 so as to be openable and closable with respect to a lower frame 2, and a biasing force in an opening direction is applied to an upper frame 3 by a torsion bar. In the opening / closing mechanism, brackets 7a and 7b are fixed to both ends of the hinge pin 4, both brackets 7a and 7b are fixed to the upper frame 3, and the intermediate portion 6a and the intermediate portion 6 are bent downward. A torsion bar 6 including a base end portion 6b and a tip end portion 6c that is bent upward with respect to the middle portion 6a, and the middle portion 6a and the base end portion 6b of the torsion bar 6 are arranged along the lower frame 2; 6c to the above brackets 7a,
An opening / closing mechanism of a clamshell type copying machine characterized by being engaged with one of brackets 7a of 7b.