JPH0420607Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for producing a stencil for stencil printing.

[Conventional technology]

Stencil printing is relatively simple and inexpensive among printing methods, so it is used for printing flyers, pamphlets, etc. This stencil printing uses a stencil in which the image to be printed is formed with ink-permeable through holes, and with printing paper superimposed on the stencil, printing ink is applied to the stencil and passed through the through holes. This is a method in which a printed image is formed by attaching it to printing paper.

Conventionally, stencil manufacturing devices have been equipped with a reading mechanism that optically reads the image of a document using changes in the amount of reflected light, and a perforation mechanism using an electric discharge method that operates in synchronization with this reading mechanism. Are known.

However, with such a device, the stencil is created by perforating the stencil with a punching mechanism while scanning the document vertically and horizontally, so it usually takes about 10 minutes to create a stencil of B4 size, for example. It takes a lot of time and it is not possible to form a master quickly. Furthermore, since the perforation mechanism employs an electric discharge method, ozone and the like are likely to be generated due to the electric discharge, which poses the problem of generating strange odors and deteriorating environmental hygiene.

For this reason, a technical means has recently been proposed in which a flash lamp is used and the light energy from the flash lamp is utilized to form ink-permeable through holes. In one example of such a technical means, as shown in FIG. 4, a light-transmissive heat-sensitive stencil 11 is formed by laminating a heat-sensitive resin on a porous support such as Japanese paper, and this stencil 11
is glued to the mount 12 at both ends to form the mount 1.
A gap is formed between the stencil 2 and the stencil 11 for inserting the original. In producing the stencil, the original 13 is sandwiched between the stencil 11 and the mount 12 so that its image surface faces the stencil 11, and the stencil 11, the original 13, and the mount 12 are stacked in this order so that they are in close contact with each other. A flash lamp (not shown) is turned on from above the stencil 11 to irradiate light onto the image surface of the original 13 through the stencil 11 . By this light irradiation, the light is absorbed by the black image portion 14 on the image surface of the original 13 and heat is generated, and this heat forms an ink-permeable through hole 15 in the image portion 14 of the original 13 of the stencil 11 . The stencil 11 is then separated from the mount 12 to obtain the stencil 16 on which the original image is formed, as shown in FIG.

According to the stencil manufacturing apparatus using such a flash lamp, a stencil can be manufactured in an extremely short time, and is extremely convenient.

The flash lamps used in such devices usually generate light using a main capacitor (hereinafter also simply referred to as a "capacitor") for supplying energy through a charging circuit consisting of a power transformer, a rectifier, etc.
This is done by charging the main capacitor to the set voltage required for making the stencil, and after charging is complete, the charging energy of this main capacitor is instantaneously supplied to the flash lamp. For example, when creating a stencil for a large document such as B4 size, a flash lamp is usually fixed, and the document 13 is tightly sandwiched between the stencil 11 and the mount 12 (hereinafter simply referred to as "workpiece"). The entire light irradiation process is performed by repeatedly emitting light from a flash lamp about 10 times in short cycles while moving the light source.

[Problem that the invention attempts to solve]

A motor is normally used as a means for transporting the object to be processed, and conventionally, it has been common to repeatedly emit light from a flash lamp while the object to be processed is continuously transported by the motor at a constant speed.

Although it is convenient to use a commercial power source as a power source for such flash lamps and motors, commercial power sources generally have voltage fluctuations. For example, in the case of a commercial power supply with a rating of 100V, it is usually approx.
It varies over a range of 90-110V. Therefore, when charging the main capacitor using a commercial power source, the time required to charge the main capacitor changes in accordance with fluctuations in this voltage. That is, as the voltage of the commercial power supply decreases, the time required to charge the main capacitor increases, and on the other hand, as the voltage of the commercial power supply increases, the time required to charge the main capacitor decreases. Furthermore, better plate making can be expected if the charging voltage of the main capacitor is varied depending on the type of document, but in this case, the higher the charging voltage, the longer the charging time will be.

In this way, the time required to charge the main capacitor changes depending on fluctuations in the voltage of the commercial power supply and the magnitude of the charging voltage of the main capacitor. In order to make it possible to perform light irradiation treatment with sufficient energy, the maximum time required to charge the main capacitor is used as a reference, that is, when the commercial power supply rating is 100V and the voltage drops to approximately 90V. In addition, the light emission time interval of the flash lamp and the transport speed of the motor were set in consideration of the case where the charging voltage was set to be the highest.

However, in such a device, when the voltage of the commercial power supply fluctuates to a high level, for example, rises to approximately 110V, or when the charging voltage is not set to the highest level, charging of the main capacitor is already completed and the light is not emitted at any time. While it is possible to
The problem is that the stencil does not emit light until a time corresponding to the set light emitting time interval has elapsed, resulting in a long waiting time and low stencil production efficiency.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and its purpose is to emit light by repeating a flash lamp at the shortest time interval depending on the fluctuation of the voltage of the commercial power supply and the set value of the charging voltage. A stencil for stencil printing with a simple structure that can transport the workpiece by a transport mechanism of a simple structure in accordance with the light emission of the flash lamp, and quickly produce a stencil for stencil printing. The purpose is to provide a manufacturing device.

[Means for solving problems]

The device for producing a stencil for stencil printing of the present invention is
By irradiating light onto a processed object in which a transparent heat-sensitive stencil is superimposed on the image surface of an original, a flare is created to form ink-permeable through holes in the stencil corresponding to the image area of the original. A flash lamp comprising a flash lamp, an energy supply main capacitor for supplying luminous energy to the flash lamp, and a trigger circuit that triggers the flash lamp when charging of the main capacitor is completed. The present invention is characterized in that it comprises a lighting circuit and a processing object conveyance mechanism having a motor that rotates by a set amount within the charging time of the main capacitor.

[Effect]

According to this configuration, a trigger circuit is provided that triggers the flash lamp when charging of the main capacitor is completed, so even when the voltage of commercial alternating current fluctuates, the set value of the charging voltage can be changed. Even when the main capacitor is charged, the flash lamp can be emitted repeatedly at the actual time interval required to charge the main capacitor, and therefore light irradiation can be performed quickly without waiting time after the main capacitor is fully charged. In addition, we have provided a processing object transport mechanism with a motor that rotates by a set amount within the charging time of the main capacitor, so that the motor drive circuit can perform on/off control according to the amount of rotational displacement of the motor. Therefore, the motor drive circuit has a very simple structure with a small number of parts.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing an outline of an embodiment of the stencil manufacturing apparatus for stencil printing of the present invention, mainly showing a processing object conveying mechanism.

This processing object conveyance mechanism basically includes a motor, which will be described in detail later, a rotatably provided cylindrical base 22 made of transparent glass, an upper roller 23 driven by the motor, and a driven lower part. Roller 24, driven auxiliary rollers 25, 26, these lower rollers 24, cylindrical base 22, upper roller 23, auxiliary roller 25, and auxiliary roller 2
6 and a conveyor belt 27 suspended from the conveyor belt 27.

Reference numeral 1 denotes a flash lamp such as a xenon flash lamp, and a reflecting mirror 21 is provided behind the flash lamp 1. The flash lamp 1 and the reflecting mirror 21 are arranged in a cylindrical base 22. It is arranged to extend along the cylinder axis. Reference numeral 10 denotes a trigger electrode, which is arranged so as to extend along the outer wall surface of the flash lamp 1.

The conveyor belt 27 is located in front of the flash lamp 1 in the cylindrical base 22, that is, in front of the reflecting mirror 21.
The conveyor belt 2 is attached to the outer periphery of the side facing the reflective surface.
7 are suspended so that they are in contact with each other. When the upper roller 23 starts rotating by the motor, the cylindrical base 22 begins to rotate in the direction shown by arrow A together with the conveyor belt 27.

28 and 29 are an inlet guide plate and an outlet guide plate, respectively. The entrance guide plate 28 is disposed in the area where the cylindrical base 22 and the lower roller 24 face each other so as to extend toward the portion where the conveyor belt 27 starts to come into contact with the cylindrical base 22. In the area where the cylindrical base 22 and the upper roller 23 face each other, the conveyor belt 27 is arranged to extend toward a portion where it begins to separate from the cylindrical base 22 .

FIG. 2 is an explanatory diagram showing an example of a lighting circuit for the flash lamp 1 and a driving circuit for the motor.

This lighting circuit includes a main capacitor 3 for energy supply for supplying luminous energy to the flash lamp 1, a charging circuit 4 for charging the main capacitor 3, and a charging completion for detecting the completion of charging of the main capacitor 3. It has a detection circuit 5 and a trigger circuit 6 that triggers the flash lamp 1 when the charging completion detection circuit 5 detects the completion of charging of the main capacitor 3. AC is a commercial alternating current power source.

The charging circuit 4 includes, for example, a switching element 41 such as a solid-state relay, a power transformer 42, a rectifier circuit 43, etc., and detects the entry of the workpiece from the entrance guide plate 28 using an entry detector (not shown). When detected by
The CHG closes the switching element 41, starts supplying current to the main capacitor 3, and performs the first charging.

The charging completion detection circuit 5 includes, for example, voltage dividing resistors 51 and 52 connected across the main capacitor 3.
, a comparator 53 , and a reference voltage source 54 , one input terminal of the comparator 53 is supplied with the voltage Vs at the connection point P between the voltage dividing resistors 51 and 52 as a signal, and the other input terminal of the comparator 53 is supplied with the voltage Vs at the connection point P between the voltage dividing resistors 51 and 52 The reference voltage Vr of the reference voltage source 54 is supplied as a signal to the input terminal of the , and when the voltage Vs at the connection point P exceeds the reference voltage Vr, the output of the comparator 53 is inverted, and this inverted signal is triggered as a charging completion signal. It is supplied to circuit 6. The magnitude of the reference voltage Vr matches the magnitude of the voltage Vs at the connection point P between the voltage dividing resistors 51 and 52 when the charging voltage of the main capacitor 3 reaches the set voltage required for making the stencil. Set it as follows.

The trigger circuit 6 includes a trigger signal generator (not shown) that generates a trigger signal consisting of a high voltage pulse to cause the flash lamp 1 to emit light;
It has a dead time signal generator (not shown) that generates a dead time signal for opening the switching element 41 of the charging circuit 4 for a short time after the flash lamp 1 starts emitting light and prohibiting the supply of electricity to the main capacitor 3. It becomes. When a charge completion signal is received from the charge completion detection circuit 5, a trigger signal is supplied to the trigger electrode 10 of the flash lamp 1, and when the insulation between the electrodes of the flash lamp 1 is broken, the charging energy of the main capacitor 3 is released. is supplied instantaneously, and the flash lamp 1 emits light. When the charge completion signal is received, a dead time signal is generated for a minute time from the dead time signal generator, and the switching element 41 is activated during the generation period of this signal.
is opened and energization to the main capacitor 3 is prohibited,
A sustained discharge phenomenon of the flash lamp 1 is prevented. When the dead time signal disappears, the switching element 41 is closed again, and the main capacitor 3 is similarly energized.

7 is a drive circuit for the motor M, and the drive circuit 7 in this example is configured to start rotating the motor M when it detects a dead time signal generated when the trigger circuit 6 receives a charge completion signal. Yes, specifically, for example, AC power supply AC
It has a switch circuit 72 for opening and closing energization from the motor M to the motor M. For example, as shown in FIG. 3, this switch circuit 72 includes mechanical contacts 73,
The contact 73 is provided with a weight 75, and the control plate 74 is provided with a recess 76 that can receive the weight 75. The opening/closing control plate 74 has its rotating shaft connected to the rotating shaft of the motor M by a gear or belt, and is rotated in conjunction with the motor M. When the recess 76 of the opening/closing control plate 74 is below the weight 75, the weight 75 is rotated. Displaced downward, at this time contact 7
3 will be opened. When a dead time signal is received in this state, for example, the electromagnet mechanism 77 is activated, the contact plate is attracted by its magnetic force, the contact 73 is closed, the motor M starts rotating, and the conveyor belt 2
7 is driven. When the motor M rotates, the opening/closing control plate 74 also starts rotating, and the weight 75 is lifted by the outer peripheral wall of the opening/closing control plate 74, so that even if the dead time signal disappears, the contact 7
3 continues, and therefore the motor M continues to rotate. Then, when the recess 76 comes under the weight 75 again due to the rotation of the motor M, the weight 75 is displaced downward and is received in the recess 76, thereby opening the contact 73 and stopping the power supply to the motor M. , the movement of the conveyor belt 27 also stops. however,
Before the flash lamp 1 starts emitting light for the first time, the dead time signal is not generated, so instead of the dead time signal, the detection generated when the loading detector detects the loading of the workpiece is used. The signal is used to operate the electromagnetic mechanism 77 to pull up the weight 75 and close the contact 73.

According to the apparatus for producing a stencil for stencil printing having the above configuration, the stencil is produced in the following manner. In other words, as shown in Figure 4,
The object to be processed is inserted along the entrance guide plate 28 with the original 13 sandwiched between the stencil 11 and the mount 12 and set in such a state that they are in close contact with each other, and is detected by a conveyance detector provided on the entrance guide plate 28, for example. When detected by CHG, the detection signal CHG from this
As a result, the first charging of the main capacitor 3 is started. In response to this detection signal CHG, the weight 75 is pulled up, the contact 73 is closed, and the motor M
The rotation of the main capacitor 3 is started, and during the charging period of the main capacitor 3, the object to be processed is transferred to the conveyor belt 27 and the cylindrical base 2.
2 and conveyed in close contact with the outer circumferential surface of the cylindrical base 22, and the recess 7 of the opening/closing control plate 74
6 comes below the weight 75, the weight 75 is displaced downward and fits into the recess 76, and at this time, the contact 7
3 is opened and the rotation of the motor M is stopped, thereby setting the first processing area of the object to be processed in the flash light irradiation area, that is, the area facing the flash lamp 1. Thereafter, when the completion of charging of the main capacitor 3 is detected by the charging completion detection circuit 5, the output of the comparator 53 is inverted, and this inverted output is supplied to the trigger circuit 6 as a charging completion signal. When this charging completion signal is received, a trigger signal is supplied from the trigger circuit 6 to the trigger electrode 10, and at this time, the flash lamp 1 emits light for the first time, and the first processing area of the processing object is illuminated. Irradiation treatment is performed.

When the dead time signal disappears after the flash lamp 1 finishes emitting light, the switching element 4
1 is closed and charging of the main capacitor 3 is started again. Further, the electromagnet mechanism 77 is activated by the dead time signal, the weight 75 is pulled up, the contact 73 is closed, and the motor M is rotated until the concave portion 76 of the opening/closing control plate 74 is again positioned below the weight 75. The object to be processed is transported, and thereby, during the charging period of the main capacitor 3, the next area to be processed of the object to be processed is located in the irradiation area of the flash light. When the charging of the main capacitor 3 is completed, the flash lamp 1 emits light in the same manner as described above, and the next region of the object to be processed is irradiated with light.

Such an operation is repeated a number of times depending on the length of the object to be processed in the transport direction, and the formation of the ink-permeable through holes 15 corresponding to the image portions 14 of the original 13 is completed in the entire stencil 11. Then, when the dead time signal disappears after the flash lamp 1 finishes emitting light in the last processing area of the processing object, the motor M similarly rotates by a set amount and the stencil 11 and original 13 are ejected. Stencil 11 by discharge detector
When it is detected that the original document 13 has been ejected, the drive circuit of the electromagnetic mechanism 77 is cut off, and the motor M is controlled so as not to continue rotating thereafter. Further, the detection signal CHG is turned off after the last processing area is irradiated with light, and thereafter the operation of the charging circuit 4 is stopped until the carry-in detector detects that the next object to be processed has been carried in.

According to the above embodiment, when the charging of the main capacitor 3 is completed, that is, when the charging voltage of the main capacitor 3 reaches the set voltage required for light irradiation, the charging completion detection circuit 5 generates the charging completion signal. ,
In synchronization with the generation of this charging completion signal, a trigger signal is generated from the trigger circuit 6 to cause the flash lamp 1 to emit light, while the motor M is driven during the charging period of the main capacitor 3 to emit light by a set amount, that is, once. The structure is such that the object to be processed is transported by rotating an amount corresponding to the distance corresponding to the light irradiation process, so even when the voltage of the commercial AC power supply AC fluctuates, the amount of time required to charge the main capacitor 3 is reduced. It is possible to repeatedly emit light from the flash lamp 1 at actual time intervals, that is, at shorter time intervals when the voltage of the commercial AC power source AC fluctuates to a higher level. Rapid light irradiation treatment can be performed without requiring time.

The drive circuit 7 of the motor M includes a contact 73 that opens and closes mechanically, and an opening/closing control plate 74 that opens the contact 73 when the amount of rotational displacement of the motor M becomes constant.
When the dead time signal disappears, contact 73
Since this configuration has an electromagnetic mechanism 77 that forcibly closes the motor M, that is, a configuration that employs an on/off control method according to the amount of rotational displacement of the motor M, the number of parts is small as a control system for the motor M. The structure is extremely simple, and therefore the device can be manufactured at low cost.

[Effect of idea]

As explained above, according to the stencil manufacturing device for stencil printing of the present invention, a trigger circuit is provided that triggers the flash lamp when charging of the main capacitor is completed, so that the voltage of the commercial AC power source fluctuates. The flash lamp can be emitted repeatedly at the actual time interval required for charging the main capacitor even when the charging voltage setting value is changed. It is possible to perform light irradiation processing quickly without requiring waiting time, and because it is equipped with a processing object transport mechanism that has a motor that rotates by a set amount within the charging time of the main capacitor, processing objects can be carried out efficiently. In addition, it is possible to use a motor drive circuit that controls on/off according to the amount of rotational displacement of the motor, and therefore the motor drive circuit has a small number of parts. The configuration is extremely simple, and the device can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an outline of one embodiment of the present invention stencil manufacturing device for stencil printing, Fig. 2 is an explanatory circuit diagram showing an example of a power supply circuit for emitting light from a flash lamp, and Fig. 3 4 is an explanatory diagram showing an example of a motor drive mechanism, FIG. 4 is an explanatory diagram showing an example of a stencil manufacturing process, and FIG. 5 is an explanatory diagram showing an example of a manufactured stencil. 11... Stencil, 12... Mount, 13...
Original, 14... Image portion, 15... Ink-permeable through hole, 16... Stencil on which the original image is formed, 1... Flash lamp, 10... Trigger electrode, 21... Reflector, 22... Cylindrical base, 23
... Upper roller, 24 ... Lower roller, 2
5, 26... Auxiliary roller, 27... Conveyor belt, 28... Entrance guide plate, 29... Outlet guide plate, 3... Main capacitor, 5... Charging completion detection circuit, 6... Trigger circuit, 7... ...drive circuit, 72
... Switch circuit, 73 ... Contact, 74 ... Opening/closing control board, 75 ... Weight, 76 ... Recess.

Claims (1)

[Claim for Utility Model Registration] By irradiating light onto a processed object in which a translucent heat-sensitive stencil is superimposed on the image surface of the original, the stencil is made to have ink transparency corresponding to the image area of the original. A flash lamp for forming a through hole, an energy supply main capacitor for supplying luminous energy to the flash lamp, and a trigger circuit that triggers the flash lamp when charging of the main capacitor is completed. A stencil for stencil printing, comprising: a flash lamp lighting circuit; and a workpiece conveyance mechanism having a motor that rotates by a set amount during the charging time of the main capacitor. Fabrication equipment.