JPH044151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal copying apparatus, and more particularly to a thermal copying apparatus used for thermal copying plate making of stencil printing paper.

As one of the thermal copying devices used for thermal copying plate making of stencil printing base paper, the original sheet and the thermal copying sheet are inserted between the light transmitting plate and the pressure plate provided in the light irradiation window. A device configured to selectively apply pressure to a polymer for exposure is well known.

When a continuous sheet-like thermal copying sheet is used in the above-mentioned thermal copying apparatus, the thermal copying sheet is passed between a light transmitting plate and a pressing plate in advance, and the thermal copying sheet is passed between a light transmitting plate and a pressing plate. During thermal copying, an original sheet is manually inserted between a light-transmitting plate and a pressing plate, and is superimposed on the thermal copying sheet on the light-transmitting plate. In this case, if the insertion position of the leading edge of the original sheet is not regulated, thermal copying will not be performed at the correct position on the thermal copying sheet, and the image at the leading edge of the original sheet will not be copied or the leading edge of the thermal copying sheet will not be copied. A large blank area will appear.

For this reason, in conventional thermal copying devices, a scale is provided on the document placement surface of the document setting table according to the standard dimensions of the document sheet, and by aligning the trailing edge of the document sheet with the scale, The positioning of the original sheet is being performed. However, positioning according to the above-mentioned method has poor operability, tends to cause variations in positioning work, and can only accurately position original sheets of standard size.

The present invention includes a stopper mechanism that prevents further insertion of the original sheet when the leading edge of the original sheet reaches a proper position until the original sheet hits the stopper mechanism between the light transmitting plate and the pressing plate. The document sheet is appropriately positioned just by being inserted, regardless of the size of the document, and the stopper mechanism is configured so that the stopper mechanism does not interfere with the pinching of the polymer by the light transmitting plate and the pressing plate. The purpose of the present invention is to provide a thermal copying apparatus with a high temperature.

The present invention relates to a thermal copying apparatus that selectively presses and exposes a polymer of an original sheet and a thermal copying sheet inserted between them by a light transmitting plate and a pressing plate provided in a light irradiation window. Either one of the light transmitting plate and the pressing plate is rotatably supported by a pivot extending along an axis perpendicular to the insertion direction of the polymer, and the light transmitting plate and the pressing plate are rotatably supported. This is achieved by a thermosensitive copying apparatus which is configured such that the edge of either the light transmitting plate or the pressing plate comes into contact with the other when the plates are separated from each other and are not pressed.

According to this configuration, the leading edge of the original sheet inserted between the light-transmitting plate and the pressing plate hits the light-transmitting plate or the vicinity of the edge of the light-transmitting plate, thereby preventing further insertion. This restricts the amount of insertion of the original sheet, thereby properly positioning the original sheet.

In the following, the invention will be explained in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a thermal copying apparatus according to the present invention. In the figure, 1 indicates a light source box, and the light source box has a light irradiation window 2 open at the top, and a light transmission plate 3 made of a transparent glass plate or the like is attached to the light irradiation window. It is being The light source box 1 has a light source device 4 such as a xenon discharge tube and a reflecting mirror 5 therein.
It emits light rays toward the light transmitting plate 3.

A pressing plate support member 6 is fixedly arranged above the light transmitting plate 2 and facing it. The pressing plate support member 6 rotatably supports one end of a swinging lever 8 by a pivot 7 near one edge of both ends thereof, and the swinging lever is provided with a cushion member. A pressing plate 9 is attached. That is, the press plate 9 is moved to the press plate support 6 by the pivot shaft 7 extending along the axis perpendicular to the insertion direction of the document sheet D between the light transmitting plate 3 and the press plate 9 via the swing lever 8. The light transmitting plate 3 is supported more rotatably.
When it is in the non-squeezing position where it is further separated, it rotates downward by its own weight and comes into contact with the upper surface of the light transmitting plate 3 at the edge 10 on the opposite side from the edge on the pivot side. Also, a relatively thin rubber plate 11 is provided at the edge 10 of the pressing plate 9.
is installed.

A cam 12 rotationally driven by an electric motor (not shown) moves the light source box 1 into a non-squeezing position where it is separated from the press plate 9 and a third position, as shown in FIGS. 1 and 2. As shown in the figure,
It is designed to move up and down between the pressing position and the pressing position pressed against the pressing plate 9.

The thermal copying sheet S is set in advance so as to pass over the light transmitting plate 3 and extend, and when thermally copying one original sheet D, the original sheet is held in the hand as shown by arrow A in the figure. As shown, it is inserted between the light transmitting plate 3 and the pressing plate 9 from the side of the pivot 7, and is superimposed on the thermosensitive copying sheet S on the light transmitting plate 3. The insertion of the original sheet D only needs to be carried out until its leading edge touches the vicinity of the edge of the pressing plate 9 or the rubber plate 11. By inserting the original sheet D as described above, the amount of insertion of the original sheet D can be reduced. and positioning of the original sheet.

After inserting the original sheet D, the light source box 1
It rises from the non-squeezing position as shown in FIGS. 2 and 2 toward the squeezing position as shown in FIG. At this time, the light source box 1 rises while pushing up the pressing plate 9, that is, rotating the pressing plate 9 around the pivot 7 in the clockwise direction in the figure. In the clamping position, the rotation of the press plate 9 in the clockwise direction is restricted by the press plate support member 6, so that the press plate 9 faces the light transmitting plate 3, and the press plate 9 faces the light transmitting plate 3.
The press plates 9 and 9 are in close contact with each other over the entire surface thereof, with the polymer of the thermal copying sheet S and the original sheet D interposed therebetween. The light source device 4 is placed in the pinching position as described above.
emits light, is exposed to light, and is thermally copied.

When one exposure is completed, the light source box 1 again begins to descend from the clamping position to the non-clamping position. As the light source box 1 descends, the press plate 9 hangs down due to its own weight with the edge 10 in contact with the upper surface of the light transmitting plate 3 with the thermal copying sheet S in between, that is, around the axis 7 as shown in the figure. Rotate counterclockwise. At this time, the width of the original sheet D is smaller than the width of the thermal copy sheet S, and the thermal copy sheet S directly contacts the pressing plate 9 at both side edges thereof,
Even if that part of the thermal copying sheet S sticks to the press plate 9 due to exposure, the light transmitting plate 3 and the press plate 9 will be separated from each other from the pivot end side of the press plate 9 as the light transmitting plate 3 descends. Since this is done gradually, the peeling off of the thermal copying sheet S from the press plate 9 is also done gradually.
Damage to the thermal copying sheet S can be avoided.

When one exposure is completed, the polymer of thermal copying sheet S and original sheet D is transferred by a predetermined amount;
As the thermal copying sheet S moves, the original sheet D pushes up the edge 10 of the pressing plate 9 and the rubber plate 11 and moves.
The next copying area of the original sheet D is located on the light transmitting plate 3.

FIGS. 4 and 5 show another embodiment of the thermal copying apparatus according to the present invention. In FIGS. 4 and 5, parts corresponding to those in FIGS. 1 to 3 are designated by the same reference numerals as those in FIGS. 1 to 3. In this embodiment, the pressing plate 9 has a pivot shaft 7 extending along an axis perpendicular to the insertion direction of the original sheet D at its intermediate portion, and the pressing plate supporting member 6 is moved from the pivot shaft 7 through the bracket 13. It is rotatably supported. Pressing plate 9
is biased counterclockwise in the figure by a tension coil spring 14 installed between one edge thereof and the pressure plate support member 6, and as shown in FIG. When the plate 3 and the pressing plate 10 are in a non-squeezing position where they are separated from each other, one edge 10 is in contact with the upper surface of the light transmitting plate 3.

Therefore, in the embodiment shown in FIGS. 4 and 5, the same effects as in the embodiment shown in FIGS. 1 to 3 can be obtained.

In the above-described embodiment, the press plate is pivotable, but the thermal copying apparatus according to the present invention
The light transmitting plate or the light source box as a whole may be pivotable, or both the pressing plate and the light transmitting plate or the light source box may be individually pivotable.

Although the present invention has been described in detail above with reference to specific embodiments, it is understood that the present invention is not limited to these and that various embodiments are possible within the scope of the present invention. This will be obvious to businesses.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the thermal copying apparatus according to the present invention, FIG. 2 is a longitudinal sectional view showing the thermal copying apparatus according to the invention shown in FIG. 3 is a longitudinal cross-sectional view of the thermal copying apparatus according to the present invention shown in FIG. 1 in a pinched state, and FIGS. 4 and 5 are longitudinal cross-sectional views showing another embodiment of the thermal copying apparatus according to the present invention. FIG. 4 shows the non-squeezing state, and FIG. 5 shows the squeezing state. 1...Light source box, 2...Light irradiation window, 3...
Light transmission plate, 4... Light source device, 5... Reflector, 6...
...Press plate support member, 7...Pivot, 8...Swing lever, 9...Press plate, 10...Edge, 11...Rubber plate, 12...Cam, 13...Bracket, D...
Original sheet, S...thermal copying sheet.

Claims (1)

[Claims] 1. In a thermal copying apparatus that performs exposure by selectively compressing a polymer of an original sheet and a thermal copying sheet inserted between them by a light transmitting plate and a pressing plate provided in a light irradiation window, the above-mentioned At least one of the light transmitting plate and the pressing plate is rotatably supported by a pivot extending along an axis perpendicular to the insertion direction of the polymer, and the light transmitting plate and the pressing plate are pulled together. A thermosensitive copying apparatus configured such that an edge of one of the light transmitting plate and the pressing plate comes into contact with the other when the light transmitting plate and the pressing plate are separated and not pressed.