JP2902073B2 - Plate making and printing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly, to a stencil printing machine in which a stencil sheet is perforated by a thermal head and the stencil sheet is mounted on a printing drum to perform stencil printing. The present invention relates to a stencil printing machine.

[Conventional technology]

A heat-sensitive stencil-type stencil printing apparatus has been proposed which is integrally provided with a stencil making apparatus for perforating and making a stencil sheet by a thermal head and a printing apparatus for stencil printing by wrapping the stencil sheet around a printing drum. (See, for example, JP-A-61-287781).

Such a heat-sensitive stencil type stencil printing machine is generally used for the purpose of obtaining a large amount of printed matter from one document, but also has a function for obtaining a very small number of copies of about 1 to 3 sheets. What they have also recently become known.

In recent years, heat-sensitive stencil type stencil printing machines have come to have various image processing functions, and on the other hand, online operations with other OA devices such as word processors and personal computers are also steadily progressing. A printed matter that is not exactly the same as the original manuscript will be produced directly, or the pixels displayed on the display will be directly subjected to plate-making printing without any original manuscript.

In such a case, the operator would like to see the output image as a hard copy before directly printing. This is because it is too late to notice a cis or mistake after perforating and making an expensive thermosensitive stencil sheet and viewing the image printed by the stencil sheet. Further, re-performing the plate-making printing by redoing the operation only wastes cost and time. Therefore, there is a demand for an operation of easily copying the image onto thermal paper or the like and confirming the image.

If there is no plain paper copier nearby,
In a case where only a single copy is desired, if a copy mode can be used in a stencil printing machine, a copy can be obtained without wasting expensive heat-sensitive stencil paper.

Therefore, as described above, a plate-making printing apparatus having a copying function for obtaining a very small number of copies of about 1 to 3 sheets has been proposed. There are roughly three types of plate-making printing apparatuses equipped with the following.

The first type is a so-called hybrid type equipped with a dedicated printer for obtaining a small number of copies.

The second type is a docking of an electrophotographic plain paper copying machine for copying a small number of copies and a thermosensitive stencil printing machine for printing a large number of copies. This is described in detail in Japanese Patent No. 72189.

The third type is a conventional heat-sensitive stencil type stencil printing machine. When a small number of copies are to be obtained, the set heat-sensitive stencil sheet is temporarily removed, and then manually. Another method is to insert thermal paper between the platen roller and thermal head, select the "one copy" mode on the operation panel, and then turn on the "start" key.

In this case, after the copy is completed, the heat-sensitive stencil sheet must be set again.

[Problems to be solved by the invention]

The first, second, and third types have been described above. In the case of the first type, in addition to the thermal head for perforating plate making, direct writing on thermal paper or writing by thermal transfer method is used. A separate thermal head for obtaining a number of copies is required, and although the scanner for reading the original is commonly used, the machine becomes large and the cost is increased due to the use of two expensive thermal heads. There is a problem that becomes.

Also, in the case of the second type, the scanner unit can be used in common. However, other copier parts must be provided separately from the plate making and printing parts, resulting in a very large and expensive device. There is.

Further, in the case of the third type, the size and cost of the machine are not so different from those of a normal thermosensitive stencil type stencil printing apparatus, and it is possible to obtain a small number of copies in an emergency. If the head is used to perform both stencil making on the heat-sensitive stencil paper and writing on the heat-sensitive paper, the roll-type heat-sensitive stencil paper and the heat-sensitive paper must be manually replaced each time copying is performed, as described above. However, there is a problem that the operation is troublesome and the operation is troublesome.

The present invention has been made in view of the above circumstances, and in the heat-sensitive stencil type stencil printing apparatus as described above, the troublesome work of pulling out the set roll-shaped heat-sensitive stencil sheet one by one for each copy is performed. It is an object of the present invention to provide a stencil printing apparatus that can easily make a small number of copies using thermal paper even if it is not required.

[Means for solving the problem]

In order to achieve the above object, the present invention relates to a heat-sensitive stencil printing machine for performing stencil printing on a roll-shaped heat-sensitive stencil sheet by a thermal head and winding the stencil sheet around the outer periphery of a printing drum to perform stencil printing. A transporting means capable of transporting the thermal paper on which an image is formed by the thermal head and the thermal stencil sheet so that the thermal paper side is in contact with the surface of the thermal head heating element; and a thermal head transported by the transporting means. Conveying means capable of separating the image-formed thermal paper from the thermal stencil base paper and discharging the same, and temporarily storing the thermal stencil base paper with a slack between the thermal head and the printing drum. Means for holding the heat-sensitive stencil paper in a standby state between the storage section or the thermal head and the printing drum, and punching the heat-sensitive stencil paper. In the stencil printing apparatus of the present invention, at the time of normal stencil printing, it has a conveying means and a control means capable of being conveyed by a fixed amount in a direction opposite to the stencil making operation. The roll-shaped stencil sheet is perforated by a thermal head, and the stencil sheet is wound around the outer periphery of a printing drum to perform stencil printing. When a small number of copies or the like are necessary, the thermal paper and the thermal stencil sheet are conveyed in an overlapped manner so that the thermal paper side is in contact with the surface of the thermal head heating element. It can be obtained on thermal paper. After completion of the copying with the thermal paper, the thermal paper on which the image has been formed is discharged, the thermal stencil sheet is returned to the position before copying, and the normal stencil printing standby state is restored.

As described above, in the stencil printing machine of the present invention, it is possible to easily obtain an inexpensive thermosensitive stencil copy without making the mechanical configuration so complicated as compared with the conventional thermosensitive stencil printing machine. Is not wasted.

〔Example〕

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a schematic structural view of a principal part of a plate-making printing apparatus showing one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a roll-shaped heat-sensitive stencil sheet, which is conveyed in the direction of the arrow in FIG. 1 while its film surface is pressed against a heating element portion of a thermal head 3 by a platen roller 2. . The heat-sensitive stencil sheet 1 is further conveyed by a first conveying roller pair 4 and a second conveying roller pair 5 after perforating and making a plate by the thermal head 3, and the leading end thereof is engaged with a clamper 7 of a printing drum 6. Is done.

The original document 8 is transported by a document transport roller pair 9, an image on the surface of the document is read by a contact type CCD sensor 10, converted into an electric signal, and sent to a control device.

The heating element of the thermal head 3 selectively generates heat based on the image information of the original document read by the contact type CCD sensor 10 of the document reading device, and the heat-sensitive stencil 1
In some cases, image information created by an operator is directly transmitted as an electric signal while performing perforating plate making or watching the display with a word processor or personal computer, and the signal may cause the thermal head to selectively generate heat.

The heat-sensitive stencil sheet 1 perforated by the thermal head 3 has its leading end locked by the clamper 7 of the printing drum 6 and is conveyed by the first conveying roller pair 4 and the second conveying roller pair 5. The printing drum 6 is wound around its outer circumference by rotation in the direction of the arrow, and finally cut by the stencil cutter 11 to complete the winding.

Then, press the “Print Start Key” on the operation panel, and the printing paper conveyed by the paper feeder (not shown)
An image is formed on the printing paper 12 by being sent while the printing roller 12 is pressed against the printing drum 6 by the press roller 13.

Normally, stencil making and printing are performed integrally and continuously in this manner.

Next, a case in which copying is performed on thermal paper using the thermal stencil type stencil printing machine having the configuration shown in FIG. 1 will be described.

In FIG. 1, a roll-shaped thermal paper 14 is previously mounted on a machine, and is sandwiched between a first thermal paper transport roller pair 15 and a second thermal paper transport roller pair 16. Here, if the "one copy" key 27 on the operation panel 26 shown in FIG. 3 is pressed, the LED 28 is turned on to enter the one copy mode. That is, the control device commands a one-copy sequence.

Then, when the "start" key 29 is pressed, the thermal paper transport roller pairs 15 and 16 rotate to start transporting the thermal paper 14. At this time, the platen roller 2 and the first conveying roller pair 4 also start rotating at the same time, so that the stencil sheet 1 is also conveyed.

Since the leading end position of the thermal paper 14 is determined to be constant in the initial state, the leading end of the thermal head writing start position is performed when the thermal paper 14 is fed by a predetermined length therefrom. In accordance with this, the original document 8 is also conveyed by the conveying roller pair 9 and the head of the reading start position is located.

Thus, the image of the original 8 is written on the surface of the thermal paper 14. That is, the contact type CCD sensor 10 of the original reading device
The heating element of the thermal head 3 selectively generates heat by the image signal read and converted into an electric signal, so that the surface of the thermal paper 14 is partially changed to black to form an image.

In this case, a pair of thermal paper transport rollers 15 and 16, a thermal paper discharge roller pair 17, a platen roller 2, and a stencil paper transport roller pair 4
Are simultaneously rotated and driven, so that the thermal paper 14 and the stencil sheet 1 are superposed and conveyed between the platen roller 2 and the thermal head 3.

The heat generated by the heating element of the thermal head 3 forms an image on the surface of the thermal paper 14 but does not sufficiently transfer to the stencil sheet 1 stacked on the back side thereof. The stencil sheet 1 is simply conveyed without the amount of heat required to perforate.

The thermal paper 14 on which the image has been written is separated from the stencil sheet 1 and proceeds as shown in FIG. 2, and is discharged to the discharge tray 21 by the thermal paper discharge roller pair 17.

On the other hand, the stencil sheet 1 is conveyed without being made by the platen roller 2 and the first conveying roller pair 4, but at this time, the second conveying roller pair 5 does not rotate. The slack of the base paper 1 is formed, and the slack of the stencil base paper 1 is temporarily stored in the storage box 20 as shown in FIG.

When the document detection sensor 18 detects the trailing edge of the document 8, the image reading by the CCD sensor 10 is completed when a certain amount is fed from there, and at the same time, the thermal head 3 detects the thermal paper.
The writing to the thermal paper 14 is also completed, and the thermal paper cutting cutter 19 operates to cut the thermal paper 14.

The thermal paper 14 that has been written and cut in this manner is reliably discharged onto the discharge tray 21 by the discharge roller pair 17 as described above. Then, the rest of the thermal paper 14 is fed by a fixed amount by the thermal paper transport roller pairs 15 and 16 to be in an initial setting state.

When the writing and transport to the thermal paper 14 is completed in this way, the platen roller 2 starts to rotate in the reverse direction, and the slack portion of the stencil sheet in the storage box 20 gradually disappears and is rewound on the sheet roll 1. That is, the center shaft 22 of the base paper roll 1 is also driven to rotate. Alternatively, the stencil paper roll 1 may not be rotated, but the stencil paper may form a slack between the platen roller 2 and the stencil paper roll, and the slack may be forcibly shaped while being shaped.

The amount of reverse rotation of the platen roller 2 may be exactly the same as the amount of forward rotation performed before the platen roller 2, and is controlled by, for example, the number of drive pulses to a pulse motor, By means of the detection sensor 23 provided between the pair 4 and the second conveying roller pair 5, the platen roller 2 can be reversed so as to rewind the stencil sheet until the slack of the stencil sheet becomes zero.

By the way, in general, the operator wants to confirm the one-copy output of the image as soon as possible. Therefore, in the apparatus of the present invention, the writing to the thermal paper is performed quickly by the method described above,
After outputting the stencil paper, the stencil paper that has been sent over the thermal paper is rewound.

By the way, usually, the image formed by perforating the heat-sensitive stencil sheet 1 is such that a mirror image is formed with respect to the image of the original 8 when viewed from the film surface side, that is, from the side of the thermal head 3. This is necessary in order to transfer a correct image onto printing paper in a state where the film is wound around the printing drum 6 with the film side facing out.

However, the image formed on the surface of the thermal paper 14 by the thermal head 3 must be a normal normal image. Therefore, when the one-copy mode is set, the controller outputs the image signal to the thermal head 3 by switching the output order so that the image becomes a normal image unlike the case of making a stencil sheet. It is configured to be.

Next, FIG. 4 is a schematic view of a main part of a plate making and printing apparatus showing another embodiment of the present invention.

In the apparatus shown in FIG. 4, perforating and printing on the heat-sensitive stencil sheet 1 are basically the same as those described with reference to FIG. Therefore, a case in which copying is performed on thermal paper by the apparatus having the configuration shown in FIG. 4 will be described.

First, the original document 8 is set on the document table 25. Next, the "one copy" key 27 on the operation panel 26 shown in FIG. 3 is pressed to turn on the LED 28, and then the "start" key 29 is pressed.

Then, the platen roller 2 and the first document conveying roller pair 4 are driven to rotate, and the stencil sheet 1 is conveyed in the direction of the arrow in the figure. At this time, the second stencil conveying roller pair 5 does not rotate. The stencil sheet 1 sags downward at the portion between the pair of rollers 4 and 5, and is temporarily stored in the storage box 20.

When the stencil sheet 1 is fed by a fixed amount in this way, the conveyance is stopped, and then the sheet of thermal paper 14 is transported by the thermal paper transport roller pair 15 at the leading end to the vicinity of the heating element of the thermal head 3. At the same time, the original document 8 is conveyed by the document conveying roller pair 9 to the vicinity of the reading start point of the contact type CCD sensor 10.

Then, from this point on, the original transport roller pair 9, the original discharge roller pair 30, the thermal paper transport roller pair 15, the thermal paper discharge roller pair 17, the platen roller 2, and the first original transport roller pair 4
Start rotating at the same time. However, the platen roller 2 and the first stencil transport roller pair 4 rotate in the opposite direction to the previous direction, and act so as to reduce the slack of the stencil in the storage box 20 little by little.

In this manner, the contact type CCD sensor 10 reads the image of the original 8, and the thermal head 3 forms an image on the thermal paper 14 conveyed while being superimposed on the stencil sheet 1.

By the way, when performing normal perforation stencil making on the heat-sensitive stencil sheet 1, the platen roller 2 rotates in the direction of the arrow in the figure, and the heating element of the thermal head 3 selectively generates heat based on a signal from the control unit. A mirror image is perforated on a stencil sheet 1. However, even if the image signal information from the control part to the heating element of the thermal head 3 is the same as above,
When the conveying direction of the stencil sheet 1 is reversed, the thermal head 3 forms a normal image instead of a mirror image.

Accordingly, in the case of the embodiment shown in FIG. 4, a special image conversion process is performed by utilizing this fact to reverse the transport direction of the thermal paper 14 to that in the case of perforating the stencil sheet 1. At least, it is possible to form eight correct original images on the thermal paper 14.

When the document discharge roller 30 finishes discharging the document 8 in this way, the thermal paper discharge roller pair 17 also discharges the thermal paper 14 on which an image is formed. Then, when the stencil sheet 1 is returned to the original state, the rotation of the platen roller 2 and the first document conveying roller pair 4 is stopped, and the initial state is established.

In the embodiment shown in FIG. 4, since the thermal paper 4 is not in the form of a roll, it is not necessary to provide a thermal paper cutting cutter as an apparatus, and the configuration and layout are simplified. It is also possible to easily incorporate a plurality of thermal papers in advance and sequentially call and transport them one by one.

Next, FIG. 5 is a schematic structural view of a principal part of a plate-making printing apparatus showing still another embodiment of the present invention.

In the apparatus shown in FIG. 5, roll-shaped heat-sensitive stencil paper 1
The steps of heat-perforated stencil making using stencil, plate feeding and printing are almost the same as those of the apparatus of FIG. 1, but in this apparatus, in a normal standby state, the leading end of the stencil sheet 1 is 2
Are transported slightly to the back of the base paper transport roller 5.

Hereinafter, a case in which copying is performed on thermal paper by the apparatus shown in FIG. 5 will be described.

In FIG. 5, the roll-shaped thermal paper 14 is previously mounted on a machine, and the leading end thereof is clamped by a thermal paper transport roller pair 15.

Set the original document 8 on the platen 25 and press the "one copy" key on the operation panel 26 as shown in FIG.
Press the “Start” key 2 with the LED 28 turned on by pressing 27
Press 9. Then, all of the two stencil conveying roller pairs 4, 5 and the platen roller 2 and the stencil retrieving roller pair 32 start reverse rotation, and the stencil paper roll shaft 22 also reverses to return the stencil paper 1 in the direction opposite to the arrow in the figure. Let it rewind. Then, the stencil sheet 1 is pulled back to a position where it is slightly closer to the front than between the platen roller 2 and the thermal head 3. At this time, a pressure control device for pressing the thermal head 3 against the platen roller 2
33 releases the pressing pressure and rewinds at high speed.

Next, the document 8 is started to be conveyed by the document conveying roller pair 9, and at the same time, the thermal paper conveying roller pair 15 also conveys the thermal paper 14 in the direction of the arrow in the figure. Then, when the leading end of the thermal paper 14 enters between the platen roller 2 and the thermal head 3 in a state where the pressing pressure of the thermal head 3 is released, the pressing pressure of the thermal head 3 is activated, and the platen roller 2 and the thermal paper Transport roller pair 15, first and second base paper transport roller pairs 4,
5 rotate, and the simultaneous transfer of the thermal paper 14 and the stencil sheet 1 is started. Then, an image read by the contact type CCD sensor 10 is formed on the thermal paper 14 by the heating element of the thermal head 3.

Further, at the time of starting the above-described conveyance, the conveyance path switching guide plate 34 is operated by the solenoid 35, and the thermal paper on which the image is formed is formed.
The path 14 is changed upward in the rear of the second thermal paper transport roller pair 5 and is directed to the thermal paper discharge table 36. And
After the original detection sensor 18 detects the trailing edge of the original, when the thermal paper 14 has been fed by a certain amount, the cutting cutter 11 operates and the thermal paper 14
Disconnect. After this cutting, the thermal paper on which writing has been completed is discharged onto the thermal paper discharge table 36.

After the thermal paper is discharged, the pressing pressure of the thermal head 3 is released, and the thermal paper transport roller pair 15 and the first base paper transport roller pair 4 are released.
And the shaft 38 of the thermal paper roll is reversed to rewind the thermal paper 14 in the direction opposite to the arrow in the figure. Then, when the leading end of the thermal paper 14 has been rewound to a position slightly before the platen roller 2 and the thermal head 3, the thermal paper 14 stops.

At this time, the transfer path switching guide plate 34 is also connected to the solenoid 35.
5, the pressing pressure control device 33 releases the thermal head pressing pressure, and the stencil sheet 1 is started to be conveyed by the rotation of the stencil sheet retrieving roller pair 32 in the direction of the arrow in FIG. Roller 2 and thermal head 3
, The pressing pressure control device 33 applies the pressing pressure of the thermal head. Then, the platen roller 2 and the first and second stencil transport roller pairs 4 and 5 also rotate, and stop when the leading end of the stencil paper 1 is fed slightly behind the second stencil transport roller pair 5 to stop at the fifth position. It returns to the initial state shown in the figure. Thus, when returning to the initial state, the LED 28 indicating the one copy mode is automatically turned off.

Now. In the embodiment shown in FIG.
Since the stencil sheet 1 and the thermal paper 14 can be shared by the stencil sheet 1, only one is required, and the roll base paper can be used as the thermal paper, so that the operability is good. Further, in the case of the embodiment shown in FIG. 5, a storage section for temporarily storing the slack portion of the stencil sheet is not required, so that the cost and the size of the apparatus can be further reduced.

〔The invention's effect〕

As described above with reference to the embodiments, the plate-making printing apparatus according to the present invention makes it possible to easily obtain an inexpensive thermal paper copy without significantly complicating the mechanical configuration as compared with a conventional heat-sensitive stencil-type plate-making printing apparatus. Therefore, it is possible to realize a stencil printing apparatus having a copying function with little increase in cost as compared with the conventional apparatus and with almost no change in the size of the machine.

Further, in the stencil printing machine of the present invention, it is not necessary to replace the heat-sensitive stencil paper and the heat-sensitive paper one by one at the time of copying. Since a thermal paper copy can be obtained, the labor of the user can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part of a plate-making printing apparatus showing an embodiment of the present invention, FIG. 2 is a view showing a state of the plate-making printing apparatus during a copying operation, and FIG. FIG. 4 is a schematic view of a main part of a plate making and printing apparatus showing another embodiment of the present invention, and FIG. 5 is a schematic part of a plate making and printing apparatus showing still another embodiment of the present invention. It is a block diagram. DESCRIPTION OF SYMBOLS 1 ... Heat-sensitive stencil paper 2, 2 ... Platen roller 3, 3 ... Thermal head, 4, 5 ... Conveyor roller pair, 6 ... Printing drum, 7 ... Clamper, 8 ... Original, 9 ... Original convey roller Pair, 10 Contact CCD sensor, 11, 19 Cutting cutter, 12 Printing paper, 13 Press roller, 14 Thermal paper, 15, 16 Thermal paper transport roller pair, 17 Thermal paper discharge roller pair, 20 ... Storage section.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41L 13/04 B41L 13/14 B41C 1/055 B41J 3/20

Claims (1)

(57) [Claims] 1. A heat-sensitive stencil type stencil printing machine for performing stencil printing on a roll-shaped heat-sensitive stencil sheet by a thermal head and winding the stencil sheet around the outer periphery of a printing drum to perform stencil printing. Transport means capable of transporting the thermal paper to be formed and the thermal stencil sheet in such a manner that the thermal paper side is in contact with the surface of the thermal head heating element, and thermal paper transported by the transport means and image-formed by the thermal head Means for separating and discharging the heat-sensitive stencil sheet from the heat-sensitive stencil sheet, and a storage portion or a thermal head capable of temporarily storing the heat-sensitive stencil sheet with slack between the thermal head and the printing drum. A means for holding the heat-sensitive stencil paper in a standby state between the heat-sensitive stencil paper and the printing drum, A plate-making printing apparatus characterized by having a transport means and a control means capable of transporting a predetermined amount in a direction.