JPS6014263Y2 - Variable magnification projection devices such as copying machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a variable magnification projection device such as a copying machine in which the conjugate distance remains unchanged, and in particular to an improvement in a movement stop device for an optical system.

As a conventional variable magnification projector with an unchanging conjugate distance, the carriage with the main lens attached is stopped at two stoppers by a forward/reverse rotation motor and movable over a range. An additional lens that can be moved in and out of the front of the main lens using a lid or lens shutter method is removed, and when the carriage is stopped by the other stopper, the additional lens enters the optical path of the main lens to perform projection. It has been known.

In such conventional variable magnification projection devices, not only is the driving device using a forward-reverse rotating motor expensive, but there are also problems with durability, and there is also the problem that variable magnification is limited to two stages. .

The present invention has been made to solve the above-mentioned problems, and provides a variable magnification projection device that uses a unidirectional rotating motor and can easily perform variable magnification projection in two or more stages.

In this invention, the main lens can reciprocate within a predetermined range along the optical path, and as the main lens moves, the additional lens moves in and out of the optical path, and when the main lens is stopped at a predetermined position, the main lens In a variable magnification projection device in which projection is performed by a combination of a lens and an additional lens, the reciprocating movement of the main lens is performed by a combination of a winding intermediate member rotating in one direction and a slider link, and the projection magnification can be selected. a stop device having a selection switch, a switch actuated by movement of a main lens provided at least at both ends or in the middle of the reciprocating motion; and drive of a winding intermediate joint based on switch information of the alternative selection switch and the stop device. A variable magnification of a copying machine, etc., characterized in that the main lens is stopped at a stop device position at the end of reciprocating motion or at an intermediate stop device position when moving in one direction, by a control device that controls the main lens. It's in the projection device.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a perspective view of a variable magnification projection device showing an example of the implementation of the present invention, FIG. 2 is a side view showing an example of an intermediate stop device, and FIG. Circuit diagram, 4th
This figure is a flowchart showing a situation in which the main lens is stopped at a predetermined variable magnification projection position by the circuit of FIG. 3, and furthermore, copying is performed.

In FIG. 1, 1 is a winding intermediate joint, 2 is a driving wheel driven by a unidirectional rotating motor M, 3 is a driven wheel, and 4 is a main lens L1 attached, and an additional lens is attached to the front frame of the main lens L1. The carriage is slidably fitted so that L2 and L3 can move in and out of the optical path of the main lens L1, and can move back and forth in the optical path direction along a track (not shown).

Since the pin 5 provided on the winding medium 1 is slidably engaged with the slider link 6 provided on the carriage 4, the carriage 4, that is, the main lens L1 can be rotated in one direction of the winding medium 1. It reciprocates as it moves.

When the carriage 4 reciprocates in this way, the additional lens L2. L3 enters and leaves the optical path of the main lens L1 by cams CI and C2, respectively.

MS l and MS3 are switches operated by the movement of the carriage 4, that is, the main lens L1, of stop devices provided at both ends of the reciprocating movement of the carriage 4, respectively, and MS2 is a switch operated by the movement of the main lens L1, which is also a stop device provided in the middle of the reciprocating movement of the carriage 4. It is a switch that is activated by the movement of.

These stopping devices are each accompanied by braking means B1 to B3 that stop the movement of the carriage 4 due to inertia, and the braking means B1 and B3 of the stopping devices at both ends of the reciprocating movement are provided with fixed braking means B1 and B3 that stop the movement of the carriage 4 due to inertia. The braking means B2 of the intermediate stopping device may be a stopper, but the braking means B2 of the intermediate stopping device is, for example, as shown in FIG. The structure is such that only a braking force is applied to the carriage 4 moving from the opposite direction by a weak pullback spring for restoring the posture.

When the carriage 4 is stopped at both ends of reciprocating motion, or when the carriage 4 is moved from one direction and stopped at an intermediate position, the switch actuator 4b of the carriage 4 presses the switch MSl, MS3 or MS2 in advance. The drive of the winding intermediate node 1 is cut off, and then the braking means Bl.

The inertial movement is stopped by B3 or B2, and the carriage 4 stops at these predetermined positions.

Corresponding to the stop position, in the example of FIG.
If it stops with L2.1, add the additional lens L2. When L3 is both out of the optical path of the main lens L1 and is in a state of 1-magnification projection, and is stopped by the braking means B2, the additional lens L2 overlaps with the main lens L1 and is in a state of, for example, 0.81x magnification projection. , when stopped by the braking means B3, the additional lens L3 overlaps the main lens L1 and is in a state of 0.71 times magnification projection, for example.

The sliding wall 6a of the slider link 6 is designed to prevent excessive load from being applied when the braking means B1 to B3 stop the carriage 4.
, 6a' are elastic walls, and these elastic walls 6a, 6a
The braking means B1 or B3 at both ends of the reciprocating motion are
Even if the carriage 4 is stopped, if the winding medium 1 is subsequently driven, the winding medium 1 will be rotated.

When the carriage 4 is stopped by the braking means B2,
When the winding intermediate joint 1 is driven, the brake section 4a of the carriage 4 is activated.
2 overcomes the compression spring of the braking means B2 and tilts the braking means B2 counterclockwise in FIG. 2, so the carriage 4 can move over it.

Further, when the carriage 4 moves in the opposite direction, the movement of the carriage 4 is not hindered because the brake part 4a easily tilts the brake means B2 clockwise.

The movement and stopping of the carriage 4, that is, the main lens L1 as described above is performed by the control device shown in FIG. 3 as shown in the flowchart of FIG. 4.

In FIG. 3, MSI to MS2 are the same switches as in FIG. 1, with MSI being a normally open type and MS2 and MS3 being normally closed types.

SO is the copy switch, SL is the same size specification switch, S2
is a 0.81x designation switch, and S3 is a 0.71x designation switch, and they are of the normally open type.

7 is input/output random access memory RAM, 8 is sewatral processing unit CPU, 9 is read-on memory ROM, 10
is a drive circuit, and M is the same motor as in FIG.

When the copying machine (not shown) is powered on and becomes operational, the control device starts operating according to the flowchart shown in FIG.

That is, the operating state signal is input to the RAM 7, which causes the same-magnification flag in the ROM 9 to be set to 1 via the CPU 6, and the 0.81-fold flag and the 0.71-fold flag to be cleared to O.

If the carriage 4 in FIG. 1 is not at the same-magnification projection position, that is, if the switch MS1 is not pressed, is the same-magnification flag 1? [ES and MSl pressed?] According to the NO judgment, the motor M is driven via the drive circuit 10 and rotates until the switch MS1 is pressed by the carriage 4 of FIG.

When switch MS1 is pressed, the OFF flag and the same-size flag are cleared, and the motor M
The carriage 4 is stopped by the braking means B1 to take the same magnification projection position as previously described in FIG. No action is taken unless S2 or S3 is pressed.

If the carriage 4 is at the same-magnification projection position from the beginning, the OFF flag and the same-magnification flag are simply cleared to 0 and no further operation is performed because the switch MS1 is pressed.

If you press the copy switch SO, the copy flag will be set to 1.
The copy flag is cleared according to the YES flow in which the copy flag is 1, and copying is performed using the same-size projection.

When the copying is completed, it returns to the standby state again.

To perform a 0.81x copy, first press the 0.81x designation switch S2.

Did that cause you to press S2? According to the judgment YES, 0.
The 81x flag is set to 1, the 1x flag and 0.7
The 1x flag is cleared.

And the 0.81x flag? Judgment: YES and MS
Did you press 2? The motor M starts rotating according to the NO judgment.

The carriage 4 thereby moves and the switch MS 2
When is pressed, is the OFF flag 1 this time? In this case, since the OFF flag has been cleared as mentioned earlier, the 0.81 times flag is cleared according to NO, the motor drive is stopped, and the carriage 4 is set to 0.8
Stops at the 1x projection position.

Is the OFF flag 1 when stopping at this intermediate stop position? This determination is made so that if the switch MS2 of the stop device is pressed only when the carriage 4 is reciprocating in one direction, in the illustrated example, moving away from the same-magnification projection position, the drive of the motor M is stopped. As will be described later, the OFF flag is set to 1 when the carriage 4 moves in the direction of the same-magnification projection position, so even if the switch MS2 is pressed, the motor M will not be driven according to YES. I can continue.

Then, the carriage 4 presses the switch MS l and turns the OF
When the switch MS2 is pressed during movement away from the same-magnification projection position after clearing the F flag, the drive of the motor M is stopped and the carriage 4 is stopped accordingly.

If the copy switch SO is then pressed, a 0.81x copy will be made, similar to the same size copy.

To perform a 0.71x copy, press the 0.71x designation switch S3.

As a result, the 0.71x flag is set to 1, and the 1x flag and the 0.81x flag are cleared.

And 0.71 times flag 1? According to the judgment YES, the motor M rotates until the switch MS3 is pressed, and when the switch MS3 is pressed, the OFF flag is set to 1, and the OFF flag is set to 0.
．． The 71x flag is cleared, and the motor M and the carriage 4 are stopped accordingly.

If the copy switch SO is then pressed, a 0.71x projection copy is performed.

If you press the 0.81x designation switch S2 while the carriage 4 is at the 0.71x projection position in this way, the OFF flag is set to 1, so as mentioned earlier, the carriage 4 will reach the 1x projection position once. 0.81 in the process of leaving after
It will stop at the double projection position.

As described above, according to the variable magnification projection device of the present invention, not only can the magnification movement of the main lens be performed accurately using the unidirectional rotating motor, but also variable magnification projection in two or more stages can be easily performed. You can also get the effect that you can.

In the present invention, the illustrated example shows a case where variable magnification is projected in three stages, but if an additional lens is also provided on the main lens Ll side of the front frame of the carriage 4 in FIG. 1, the same magnification can be achieved. Including, the magnification can be changed in up to five steps, and if necessary, the number of magnification changes can be further increased by providing a frame section on the rear side of the main lens L1.

Further, the stopping device is provided with braking means B1 to B3 for accurately stopping the carriage 4, but the switch MSI
~It goes without saying that there is no need to provide the braking means B1 to B3 when the rotation of the winding intermediate joint 1 is rapidly stopped due to the operation of MS2, etc., and the clutch can be disengaged without stopping the motor M. It may be something like this.

Furthermore, copy switch SO and variable magnification designation switches S1 to S
A normally open switch is used for the 3rd etc., but it can be changed to a changeover switch that is switched when copying is completed or an interlocking switch that is selectively switched, so that it can be controlled not by a microcomputer as shown in the figure but by a mechanical control device. You can also do this.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a variable magnification projection device showing an example of the implementation of the present invention, FIG. 2 is a side view showing an example of an intermediate stop device, and FIG. Circuit diagram, 4th
The figure is a flowchart of copying including the operating status of the circuit diagram of FIG. 3. 1... winding intermediate clause, 4... carriage, 5...
...Zen, 6...Slider link, 6a,
sa/...Elastic wall, 7...Input/output/Random access memory RAM, 8
...Central processing unit CP
U, 9...Read-on-memory ROM, I
Q... Drive circuit, Ll... Main lens, L2. L3...Additional lens, MS1~MS
3...Stop device switch, M...Motor, SO...Copy switch, S1-S3...
...Magnification specification switch.

Claims (1)

[Claims for Utility Model Registration] 1. The main lens is capable of reciprocating within a predetermined range along the optical path, and as the main lens moves, the additional lens moves in and out of the optical path, stopping the main lens at a predetermined position. In a variable magnification projection device in which projection is performed by a combination of a main lens and an additional lens, the reciprocating movement of the main lens is performed by a combination of a winding intermediate joint and a slider link that rotate in one direction, and A stop device having an alternative selection switch for projection magnification, a switch operated by movement of the main lens provided at least at both ends of the reciprocating movement, and even in the middle; A copying apparatus characterized in that the main lens is configured to be stopped at a stop device position at the end of reciprocating motion or at an intermediate stop device position when moving in one direction, by a control device that controls the drive of the hooking joint. Variable magnification projection device for machines, etc. 2. A stopping device having a switch activated by the movement of the main lens is provided with a means for braking the movement of the main lens, and the braking means of the stopping device provided in the middle applies strong braking to the movement of the main lens in one direction. A variable magnification projection device for a copying machine or the like as claimed in claim 1, which applies only a weak braking force to movement in the opposite direction. 3. A variable magnification projection device such as a copying machine according to claim 1 or 2 of the utility model registration claim, in which the sliding wall of the slider link is an elastic wall.