JPS6134137B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a platen cover locking device for a copying machine for locking a platen cover provided on a platen so as to be openable and closable during exposure.

Generally, in a flash exposure copying machine using a flash lamp as a light source, the copying machine platen cover is locked in order to protect the user's eyes. However, with conventional locking mechanisms, the user may force the platen cover to open after exposure is completed and before the lock is released, resulting in early failure of the locking device, or by having to grasp the lever each time the platen cover is opened or closed. There were drawbacks such as the need to release it and the operation was troublesome.

The present invention has been made for the purpose of eliminating such conventional drawbacks, and provides a platen cover locking device for a copying machine that locks the platen cover only during flash exposure, thereby facilitating operation and locking the platen cover. The aim is to prevent early damage to the equipment.

The present invention will be described in detail below with reference to an illustrated embodiment. In the figure, 1 is the main body of the copying machine, and 2 is a platen provided on the main body 1, on which a document 3 to be copied can be placed. Above the platen 2, one end is supported on a support shaft 4. A platen cover 5 is provided whose other end can be opened and closed vertically about the support shaft 4, and a flash lamp 7 is installed below the platen 2. Further, a locking rod 8 is protruded from the lower surface of the open end side of the platen cover 5, and a notch 8a and a recess 8b are formed above the notch 8a at the tip side of the locking rod 8.

A locking mechanism 9 is installed on the side of the main body 1 that matches the locking rod 8 when the platen cover 5 is closed on the platen 2. The locking mechanism 9 has a ball 11 biased by a compression spring 10 at a position where it fits into the recess 8b of the locking rod 8 from both sides when the platen cover 2 is closed, and a locking mechanism below which is reciprocated by a solenoid 12. A body 13 and a semicircular swing cam 14 are installed vertically apart from each other. The locking body 13 is slidably inserted between guide grooves 15a recessed in mutually opposing positions of the frame 15, and the tip thereof can be freely engaged and detached from the notch 8a of the locking rod 8. A locking portion 13a that engages with the frame 15 is provided, and a tension spring 16 is stretched between the tip of the locking body 13 and the frame 15.
The locking body 13 is urged in the opening direction. Further, the proximal end side of the locking body 13 is connected to an operating portion 12a of a solenoid 12 installed on the frame 15.
The solenoid 12 is electrically connected to a control circuit 17, and is energized by a signal from the control circuit 17 only during exposure.

On the other hand, the semicircular center of the swing cam 14 is swingably supported by a pin 18 on a part of the frame 15, and when the platen cover 2 is closed, the locking rod 8
It is designed so that it can be rotated in the direction of arrow a at the tip. A switch 19 is provided near the swing cam 14, and when the swing cam 14 is rotated in the direction of arrow a, this sends a closing completion signal to the control circuit 17.

When the original 3 to be copied is placed on the platen 2 and the platen cover 5 is closed, the tip of the locking rod 8 turns on the switch 19 via the swing cam 14, thereby allowing copying to the control circuit 17. At the same time, the ball 11 is fitted into the recess 8b of the locking rod 8, and the platen cover 5 is positioned. In this state, an exposure signal is output from the control circuit 17 to the flash lamp 7, and at the same time, the solenoid 12 is also energized. 8a to lock the platen cover 5 from being opened. When the exposure is completed, solenoid 12
Since the locking body 13 is also demagnetized, the tension spring 16
Since the platen cover 5 is returned to its original position and the locking rod 8 is released, the platen cover 5 can be opened.

As described in detail above, this invention automatically locks the platen cover only during exposure.
It is easier to operate than conventional models as there is no need to release the platen cover, and since the platen cover is locked for a short time only during exposure, there is no need to force the platen cover to open and lock it before it is unlocked. Conventional problems such as premature damage to the mechanism can also be eliminated.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention, with FIG. 1 being a partially cutaway side view, and FIG. 2 being an enlarged sectional view of this device.
FIG. 3 is a plan view of the same, and FIG. 4 is a sectional view taken along the line - FIG. 2 is a platen, 5 is a platen cover, 8 is a locking rod, 8a is a notch, 12 is a solenoid, and 13 is a locking rod.

Claims (1)

[Claims] 1. In an apparatus that flash-exposes a document 3 placed on a platen 2, a locking rod 8 is provided protruding from a platen cover 5 provided on the platen 2 so as to be openable and closable, and when the platen cover 5 is closed, the locking rod 8 is attached to the locking rod 8. A locking body 13 that can be freely engaged and disengaged from the notch 8a is provided at a position where the provided notch 8a matches, and the locking body 13 is moved to a locking position by means such as a solenoid 12 that is operated during exposure. A platen cover lock device for a copying machine.