JPS597371B2 - thermal copy machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal copying machine, particularly a light irradiation window provided with a transparent plate that is irradiated with light from a light source, and a closed position covering the light irradiation window and an open position separated from the light irradiation window. This relates to a type of thermal copying machine equipped with a press plate that is rotatable around a single axis between the press plate and the press plate.

A so-called heat-sensitive sheet, which has properties that change with heat, is layered on the original image to be copied, and this is irradiated with light, especially light rays rich in infrared rays, to generate heat due to the radiant energy absorbed in the black parts of the original image. As a type of thermal copying machine that performs so-called thermal copying, in which changes such as discoloration, perforation, or shrinkage are caused in the heat-sensitive sheet in imitation of the original image using
a light irradiation window equipped with a transparent plate that is irradiated with light from a light source;
A press plate opening/closing type thermal copying machine is known which is provided with a press plate that is rotatable around a single axis between a closed position covering the light irradiation window and an open position separated from the light irradiation window. ing.

By the way, in thermal copying, in order to obtain a copy sheet with a good finish, it is desirable to irradiate the original image and the heat-sensitive sheet with a light beam while the original image and the heat-sensitive sheet are in close contact with each other with a pressure of a predetermined value or more.

On the other hand, conventionally, in the above-mentioned type of thermal copying machine,
The energization of the light source is controlled by a limit switch that is pressed and activated by contacting a portion of the press plate when the press plate is in the closed position.

Therefore, if the thickness of the original image is constant, the light source is energized while the original image and the heat-sensitive sheet are in close contact with each other with a constant pressure force, and the light beam is irradiated. When the thickness of the heat-sensitive sheet changes, the pressure force between the original image and the heat-sensitive sheet changes by 5 when the pressure plate presses the limit switch, making it impossible to irradiate the light beam under a constant pressure force. There is a problem. That is, if the original image is thin like onion vapor, the light rays may be irradiated without a predetermined pressing force being obtained. The present invention was proposed in view of the above-mentioned problems in conventional press plate opening/closing type thermal copying machines. It is an object of the present invention to provide an improved thermal copying machine in which good quality copy sheets can always be obtained by preventing energization.

According to the present invention, the present invention provides a base, a light irradiation window having a transparent plate fixedly supported by the base and irradiated with light from a light source, and a closed position covering the light irradiation window and a position where the light irradiation window is opened. an engagement block mounted on the base so as to be rotatable about a first pivot relative to the base between a separated open position and a position spaced apart from the first pivot; a pressing plate;
a lever element mounted on the base so as to be rotatable around a second pivot; and a lever element mounted on the base so as to be rotatable around a third pivot at a position spaced apart from the second pivot. a lever element that engages with the engagement block at an intermediate point between the third pivot and the gripping portion serving as a point of force, and applies a rotational force in the closing direction to the press plate; and a press plate closing operation by the lever element. a spring element that flexibly biases the lever element around the second pivot in a direction that resists the rotational force applied to the lever element by the lever element; and a switch that controls energization of the light source. , wherein the switch is configured to turn on when the lever element is rotated a predetermined amount against the spring action of the spring element, allowing energization of the light source. This is achieved by a copying machine.

According to this configuration, when the lever element is rotated by a predetermined amount against the spring action of the spring element, in other words, the pressing plate presses against the transparent plate of the light irradiation window with a pressing force of a predetermined value or more. When pressed, the switch turns on and allows electricity to be applied to the light source, so that the original image and the heat-sensitive sheet sandwiched between the transparent plate and the pressure bonding plate have the same thickness as the original image. Even if the pressure changes, the light from the light source will be irradiated when they are in close contact with each other with a pressure bonding force greater than a predetermined value.

The copying machine constructed as described above achieves the intended purpose as described above, but even when the pressing plate is open, the lever element may resist the spring action of the spring element for some reason. When the light source is rotated by a predetermined amount, the light source is energized, and the light rays from the light source are irradiated onto the light source with the light irradiation window exposed, damaging the eyes of the operator and those in the vicinity. There is a danger that

Another object of the present invention is to provide a thermal copying machine having the above-mentioned structure, which incorporates a safety device for preventing malfunction of the light source.

According to the present invention, such an object is achieved by: a base; a light irradiation window having a transparent plate fixedly supported by the base and irradiated with light from a light source; an engagement block mounted on the base so as to be rotatable about a first pivot relative to the base between a separated open position and a position spaced apart from the first pivot; a pressing plate;
a lever element mounted on the base so as to be rotatable around a second pivot; and a lever element mounted on the base so as to be rotatable around a third pivot at a position spaced apart from the second pivot. a lever element that engages with the engagement block at an intermediate point between the third pivot and the gripping portion serving as a point of force, and applies a rotational force in the closing direction to the press plate; and a press plate closing operation by the lever element. a spring element that flexibly biases the lever element around the second pivot in a direction that resists the rotational force applied to the lever element by the lever element; first and second switches electrically connected in series, the first switch being turned on when the lever element is rotated a predetermined amount against the spring action of the spring element; The second switch is turned on when the pressing plate is closed to a predetermined position near the closed position, and the light source is allowed to be energized when both the first and second switches are in the on state. This is achieved by a thermal copying machine characterized by the following configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing one embodiment of a thermal copying machine according to the present invention, FIGS. 2 and 3 are side views partially in section showing its two operating states, and FIG. 4 is a perspective view showing an embodiment of a thermal copying machine according to the present invention. FIG. 1 is a perspective view showing the main parts of a copying machine.

In these figures, 1 is the base of the copying machine;
A light irradiation window case 2 is arranged above. The light irradiation window case 2 has a transparent plate 3 such as a glass plate on its upper surface, which serves as a light irradiation window. Xenon discharge tubes 4 and 5 and a reflecting mirror 6 are arranged to uniformly irradiate the polymer with the adhesive sheet S with light beams. Moreover, the base 1
A support 7 is fixed above, and a press plate 9 is placed around a first pivot 8 supported by the support 7 in a closed position covering the light irradiation window and in an open position separated from this. It is mounted so that it can rotate between.

The pressing plate 9 is for applying the necessary pressing force for copying to the polymer placed on the transparent plate 3, and is a urethane foam plate with high elasticity attached to the surface corresponding to the transparent plate 3. 10 to apply a uniform pressure to the polymer over its entire surface. Note that this crimp plate 9 is flexibly biased in the opening direction by a spring device not shown in the figure, and when it is not applied with a rotational force in the closing direction by a pressing lever 11 to be described later, it is in the first position. It is positioned in the open position as shown in the figure. As clearly shown in FIG. 1, the support body 7 has arm portions 12 and 13 extending from the top thereof toward the front of the copying machine along both sides of the irradiation window case 2, respectively. , carries a lever element 15 at the tip of each of its arms 12, 13 in a manner that allows it to rotate around a second pivot 14.

A third pivot 18 is disposed at one end, that is, the front end, of each of the left and right lever elements 15, and the tips of the left and right crosspieces 16 of the press lever 11 are pivotally attached to this pivot 18, respectively. There is. That is, the pressing lever 11 has one end rotatably pivoted to the third pivot 18 as described above, and the other ends of the left and right crossbars 16 are connected to each other. It has a yoke shape, and has a second grip part 17 that is connected to the grip part 17, and has a yoke shape.
When rotated clockwise in the figure, each of the crossbars 16 hits an engagement block 19 protruding from the left and right side surfaces of the press plate 9 in the middle, and is multiplied by a lever action. The applied force causes the pressing plate 9 to rotate in the closing direction, that is, in the clockwise direction in FIG. 2 about the first pivot 8. The lever element 15 absorbs the reaction force acting on the third pivot 18 when the pressing lever 11 hits the engagement block 19 of the pressing plate 9 and applies a rotational force in the closing direction to the pressing plate 9. According to the second axis 14
A rotational force is applied in the counterclockwise direction in FIG.
That is, the spring support 20 attached to the rear end and the support 7
This is done against the spring force of a tension coil spring 21 installed between ζ.

That is, the tension coil spring 21 is connected to the pressing lever 11.
The lever element 15 is flexibly biased in a direction that resists the rotational force applied to the lever element 15 by the pressing plate closing operation, that is, in the clockwise direction in FIG. In this case, the spring support 20 of the tension coil spring 21 is a screw so that the set preload of the tension coil spring 20 can be adjusted. When the tension coil spring 21 is installed with a predetermined preload, the lever element 15 is moved from the support as shown in FIG. 2 until a load corresponding to the preload is applied to the third pivot 18. The second pivot 14 in FIG.
It is rotated counterclockwise around the center. Further, the support body 7 supports a switch operation lever 24 in a manner that it can rotate around a fourth pivot 23.

The switch operating lever 24 has one end facing the rear end of the lever element 15 and a spring piece 27 corresponding to the switch operating element 26 of the first microswitch 25 at the other end. Unless the lever element 15 is rotated against the tension coil spring 21, the switch operation lever 24 is held in the rotational position shown in FIG. However, when the lever element 15 is rotated by a predetermined amount against the spring force of the tension coil spring 21, as shown in FIG. The first microswitch 25 is rotated counterclockwise in FIG. It's getting old. The first microswitch 25 is incorporated into the power supply circuit of the xenon discharge tubes 4 and 5, and is electrically connected to allow current to flow to the xenon discharge tubes when in the on state. In the case of this embodiment, as one of the safety devices, a second microswitch 28 is turned on when the pressing plate 9 is closed to a predetermined position near the closed position as shown in FIG. It is electrically connected in series with the first microswitch 25 into the power supply circuit of the xenon discharge tube.

This second microswitch 28 is operated by a cam 29 attached to the rotating base side of the pressing plate 9. Therefore, in the thermal copying machine constructed as described above, the pressing plate 9 is closed to a predetermined position near the closed position, and the lever element 15 is operated by the pressing lever 11 under the spring action of the tension coil spring 21. When the xenon discharge tubes 4 and 5 are rotated by more than a predetermined amount in the counterclockwise direction as shown in FIGS. irradiated.

By the way, when the lever element 15 is rotated by a predetermined amount against the action of the tension coil spring 21, the spring force that the tension coil spring 21 gives to the lever element 15, in other words, the pressing lever 11 This is when the load applied to the third pivot 18 is balanced with the pressing plate closing operation by the tension coil spring 21.
By appropriately setting the spring force of the lever element 15
When the press plate 9 is pressed against the transparent plate 3 with a predetermined surface pressure, it rotates by a predetermined amount, turning on the first microswitch 25 and allowing the xenon discharge tubes 4 and 5 to be energized. become.

In other words, the xenon discharge tubes 4 and 5 are energized and flash when the press plate 9 is pressed against the transparent plate 3 with a predetermined surface pressure. Next, the balance of the force applied to the lever element 15 will be explained using a mathematical formula. Now, the operating force applied to the operating lever 11 is P1, the load applied to the third pivot 18 is Q, and when the necessary predetermined surface pressure is applied to the transparent plate 3 by the pressing plate 9, the The load acting on the coupling block 19 is W, the spring force that the tension coil spring 21 gives to the lever element 15 when the lever element 15 is rotated by a predetermined amount is P2, and the spring force of the tension coil spring 21 is the lever force. 15 and the second pivot 14 is a, the lever length between the second pivot 14 and the third pivot 18 is b, and the pressing lever 11 is engaged. The length of the lever between the point of contact with the coupling block 19, that is, the point of action, and the third pivot shaft 18 is C, and the length of the lever between the grip part 17 of the pressing lever 11, that is, the point of force of the operating lever 11, and the third pivot shaft 18 is C. If the length of the lever between is d, the following equation holds true. (1), (2), (3
) As is clear from this formula, by appropriately setting the spring force of the tension coil spring 21, the lever element 15 can be moved when the pressing lever 11 is pressing the engagement block 19 with a predetermined load. That is, when the pressing plate 9 is pressing the transparent plate 3 with a predetermined surface pressure, the tension coil spring 21
The first microswitch 25 is turned on by a predetermined amount against the spring force.

Although the present invention has been described in detail with respect to specific embodiments above, it will be understood by those skilled in the art that the present invention is not limited to these and that various embodiments can be made within the scope of the present invention. It should be obvious.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of a thermal copying machine according to the present invention, FIGS. 2 and 3 are side views partially in section showing its two operating states, and FIG. 4 is a perspective view showing an embodiment of a thermal copying machine according to the present invention. FIG. 1 is a perspective view showing the main parts of a copying machine. 1...Base, 2...Light irradiation window case,
3...Transparent plate, 4,5...Xenon discharge tube, 6...Reflector, 7...Support,
8...First axis, 9...Press plate, 1
0... Urethane foam board, 11...
Pressing levers 12, 13... arm portion, 14...
...Second axis, 15...Lever element, 16...
... Crosspiece, 17 ... Gripping part, 18 ...
...Third axis, 19...Engagement block, 20
... Spring supporter, 21 ... Tension coil spring, 22 ... Stopper 23 ... Fourth pivot, 24 ... Switch operation lever, 25
...First microswitch, 26...
・Switch operator, 27...Spring piece, 28...
...Second microswitch, 29...Cam.

Claims (1)

[Scope of Claims] 1. A base, a light irradiation window including a transparent plate fixedly supported by the base and irradiated with light from a light source, and a closed position covering the light irradiation window and a position separated from the light irradiation window. a pressing plate mounted on the base so as to be rotatable about a first pivot relative to the base between the open position and the open position and having an engagement block at a position spaced apart from the first pivot; , a lever element rotatably mounted on the base so as to be rotatable around a second pivot; and a lever element rotatably mounted on the lever element at a position spaced from the second pivot about a third pivot. a lever element that engages with the engagement block at an intermediate point between the third pivot shaft and the grip portion serving as a point of force, and applies rotational force to the pressing plate in the closing direction; and a lever element that is operated by the lever element to close the pressing plate. a spring element that flexibly biases the lever element around the second pivot in a direction that resists the rotational force applied to the lever element by the lever element; and a switch that controls energization of the light source. and the switch is configured to turn on when the lever element is rotated a predetermined amount against the spring action of the spring element, allowing energization of the light source. Thermal copying machine. 2. Between a base, a light irradiation window that is fixedly supported by the base and includes a transparent plate that is irradiated with light from a light source, and a closed position that covers the light irradiation window and an open position that is separated from this. a pressing plate mounted on the base so as to be rotatable about a first pivot with respect to the base and having an engagement block at a position spaced apart from the first pivot; a lever element rotatably mounted around a second pivot; and a lever element rotatably mounted on the lever element at a position spaced from the second pivot about a third pivot; a lever element that engages with the engagement block at an intermediate point between the lever element and the gripping part that serves as a point of force, and applies rotational force to the pressing plate in the closing direction; a spring element flexibly biasing the lever element about the second pivot in a direction against a rotational force applied to the lever element; and a spring element electrically connected in series with each other to control energization of the light source. first and second switches, the first switch being turned on when the lever element is rotated a predetermined amount against the spring action of the spring element; The light source is configured to be turned on when the pressing plate is closed to a predetermined position near the closed position, and the light source is allowed when both the first and second switches are in the on state. A thermal copying machine.