JPH0761708B2 - Stencil making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a plate making apparatus capable of making a plurality of print images of one original on the same stencil sheet.

(B) Conventional Technology As described in, for example, Japanese Utility Model Laid-Open No. 59-169939, a conventional plate making apparatus scans an original in a fixed direction at an image pickup position of an image pickup apparatus, and a single stencil plate. Only one calligraphic image was made on the base paper.

Also, although the fields of industrial application are different, an electrophotographic copying apparatus which forms one original document image by dividing it into a plurality of copies on the same copying sheet is already known (Japanese Patent Publication No. 61-61). -36234 gazette).

The electrophotographic copying apparatus includes an image forming optical system that forms an electrostatic latent image by forming an image of a document on an image carrier, and a developing device that develops the electrostatic latent image into a visible image. , A copy sheet feeding means for feeding the copy sheet to the transfer portion in order to transfer the visible image on the image carrier, and a sheet circulation for repeatedly feeding the copy sheet to the transfer portion. The original sheet and the copy sheet are formed by using the sheet circulating / conveying means for making the sheet and the sheet repetitive feeding function by the conveying means together so as to form a plurality of copy images corresponding to the image of the original document by dividing them into the same copy sheet. And a displacing means for relatively moving and displacing and so as to selectively correspond to individual copy images.

(C) Problems to be Solved by the Invention In the plate making apparatus described in Japanese Utility Model Laid-Open No. 59-169939, even if the area of the original is extremely small compared to the area of the stencil sheet. However, one manuscript image is always printed on one stencil sheet, and platemaking efficiency is inevitably low.

By the way, the so-called stencil paper is generally used in a so-called B4 size, but the original is not necessarily limited to the B4 size, and a B5 size or a smaller size is often used. Therefore, when an original having such a small area is made into a stencil sheet having an area twice or more that of the original, not only the plate making efficiency is lowered as described above, but also the printing paper is wasted.

Therefore, such problems can be avoided by making a plurality of original document images on one stencil sheet, but in the conventional apparatus,
After supplying the plate once to the plate making apparatus and taking out the original, the original must be supplied again to the plate making apparatus, which is troublesome. Further, if the alignment is not performed accurately, there is a possibility that a plurality of original document images may be overlaid in the same area of the stencil sheet.

Further, in the electrophotographic copying apparatus described in Japanese Patent Publication No. 61-36234, the writing images of a plurality of originals are certainly copied onto one copying sheet, and the copying efficiency is high, but As described above, the structure is complicated to avoid the copy sheet, resulting in an increase in cost and an increase in size, and it is impossible to use this for a plate making apparatus.

(D) Means for Solving the Problems The present invention provides an image pickup means for reading a written image on the surface of a document to be plate-made and converting it into an electric signal, and a document transfer for scanning the document at an image pickup position. Means, a thermal head in which heating elements are arranged in a straight line for making a stencil sheet corresponding to a document to which an output signal from the image pickup means is input, and the stencil sheet is brought into sliding contact with the heating element. While in the plate making apparatus provided with a base paper transfer means for transferring in a direction substantially orthogonal to the arrangement direction of the heating elements, the document transfer means is provided with means for reciprocating the document at least 1.5 times, The image pickup means is a plate making apparatus for stencil sheet, characterized in that the image pickup means is capable of picking up an image of a document only when the document is moving forward.

(E) Action The document is reciprocated 1.5 times at the image pickup position, that is, the document is transported in the order of forward movement, backward movement, and forward movement, and during the first forward movement and the second forward movement, respectively. The same side of the document is imaged,
At this time, since the stencil sheet is transported in one direction, at least two identical calligraphic images are produced along the moving direction of the stencil sheet.

If the writing image read by the image pickup means is stored in the memory line by line and the plate is made twice by picking up the image once, it is possible to make four original images (the original of B6 is 4 plates on B4 base paper). Also, 1/2
It is also possible to reduce to 4 and make four plates.

(F) Example FIG. 1 to FIG. 4 show a plate making and printing apparatus as an example of the present invention, and FIG. 1 and FIG.
FIG. 3 is an external perspective view, and FIG. 3 is an external perspective view showing a state in which the upper cover is released. It should be noted that FIG. 1 shows a state in which the document moves forward, and FIG. 4 shows a state in which the document moves backward.

In these figures, (1) is the main body of the plate-making printing apparatus,
A well-known cylindrical plate cylinder (2) is rotatably mounted inside. A support shaft (4) extending parallel to the rotation axis (3) of the plate cylinder (2) is rotatably inserted in the non-printing area of the plate cylinder (2). A plurality of hook-shaped set hooks (5) that can project in the centrifugal direction from the circumferential surface of the body (2) are arranged along the extending direction of the support shaft (4).

The protrusion of the support shaft (4) from the side end surface of the plate cylinder (2) is substantially L for rotating the support shaft (4).
A letter-shaped lever (6) is fixed.

Therefore, the set hook (5) and the lever (6) are integrated so that they can swing about the support shaft (4). A spring member (not shown) is attached to the set hook (5), and its tip is separated from the plate cylinder (2) at a first position (solid line position in FIG. 1) and the stencil sheet (7). ) When holding the plate cylinder (2)
It is configured so that it can be swung moderately between a second position (position indicated by the chain line in FIG. 1) in pressure contact with. (8) is an ink supply port for supplying printing ink into the plate cylinder (2).

A base paper holding shaft (11) on which a strip-shaped stencil base paper (7) wound in a roll is mounted on the upper left side of the apparatus main body (1).
Is provided, and the base paper holding shaft (11) has a substantially T shape,
A thermal head holding arm (9) is swingably provided. One free end of the thermal head holding arm (9) is locked by being engaged with the free end of the lock lever (12), and the other free end has a transfer angle of the stencil sheet (7). A guide pin (10) is provided to keep it constant. Further, a holding pin (88) is planted on a substantially central side surface of the thermal head holding arm (9), and the holding pin (88) is provided.
The thermal head holding lever (89) has a fixed thermal head (13) in which a large number of heating elements are arranged in a straight line that is orthogonal to the direction of transport of the stencil sheet (7) and parallel to its plane. It is rotatably attached.

At one end of the thermal head holding lever (89), a tension spring (14) is stretched between the thermal head holding arm (9) and the thermal head (13).
It is pressed by the platen roller (15) as a base paper transfer means by the elastic force of 4). Reference numeral (92) is a stopper pin embedded in the thermal head holding arm (9), and in order to clean the thermal head (13), the lock lever (12) is disengaged, and the thermal head holding arm (9) is released. ), The thermal head holding lever (89) is prevented from rotating in an unlimited clockwise direction by the tension spring (14) when the base paper holding shaft (11) is rotated counterclockwise. .

The stencil sheet (7) is a heat-sensitive one in which polypropylene fine denier paper is superposed on a polyester film, and is selectively heated by the thermal head (13) as a plate-making means to make a plate.

On the downstream side of the thermal head (13), a photo sensor for operating a cutting device (16) described later by detecting a display unit (not shown) attached to the stencil sheet (7). (17) is provided.

In the guide (18) on the downstream side of the photo sensor (17),
A recess (19) is provided, and a heat wire (20) is stretched above the recess (19) in a direction orthogonal to the transfer direction of the stencil sheet (7) and parallel to its plane. A cutting device (16) is provided. This cutting device (16) thermally cuts a band-shaped stencil sheet (7) into a desired length dimension, and mainly a swing lever (21) capable of swinging up and down.
And a vertical moving rod (22) engaged with the free end thereof, near the lower end of the vertical moving rod (22),
The heat wire (20) is stretched. (23) is
A drive lever for driving the swing lever (21).

On the downstream side of the heat wire (20), a capstan (25) fixed to a rotary shaft (24) via a one-way clutch and one end of an L-shaped support lever (26) are rotatable. A base paper transfer means is provided which is mounted and includes a pinch roller (27) which is pressed and biased toward the capstan (25).

At the downstream side of the base paper transfer means, there is a support shaft (2
An oscillating guide (29) is provided whose upstream free end can oscillate vertically with respect to 8) as a fulcrum.

Below the swing guide (29), an L-shaped swing arm (3
(0) The arc-shaped course change guide (3
1) is provided, and the other end of the swing arm (30) is connected to the solenoid (32). The diversion guide (31)
By the solenoid (32) performing a suction operation,
The upper end moves upward and pushes up the swing guide (29), and the upper end enters into the horizontal raw paper feed passage (the first position shown by the chain line in FIG. 1). When the solenoid (32) is de-energized and its suction operation is stopped, the path changing guide (31) falls by its own weight, and the upper end of the path changing guide (31) exits from the base paper feeding passage (see the solid line Position 2).

Below the path change guide (31), the stencil sheet (7) whose path has been changed by the path change guide (31) is introduced to the outside (left side) of the apparatus body (1). A conveyor (33) is provided, a base paper outlet (34) is opened on the downstream side of the conveyor (33), and a base paper placing tray (3) is provided outside the base paper outlet (34).
5) is detachably attached.

Above the swing guide (29), the vertical fixed guide (3
6) is provided, and a reflection type photo sensor (37) for detecting the arm bending state of the stencil sheet (7) is fixed to the vertical fixed guide (36).

A horizontal fixed guide (93) is provided downstream of the swing guide (29) in the horizontal direction. This horizontal fixed guide (9
3) and the base paper feed roller (3
9) are both attached to the lower surface of the upper cover (38) of the apparatus body (1). The base paper feeding roller (39)
Is also connected to the pulley (41) of the motor (40) mounted on the upper cover (38) via a timing belt (42) and a one-way clutch (not shown). The motor (40) sets the downstream end of the stencil sheet (7) on the plate cylinder (2) in synchronization with a detection signal when the photo sensor (37) detects the stencil sheet (7). It is for transferring to the hook (5).

The capstan (25) and the pinch roller (27) continue to rotate even after the downstream end of the stencil sheet (7) is clamped by the set hook (5). When the stencil sheet (7) bends at the downstream side of the vertical fixed guide (36) and its presence is detected by the photo sensor (37), the plate cylinder (2) rotates at a slow speed. In this way, the plate cylinder (2) rotates intermittently every time the stencil sheet (7) bends, and the stencil sheet (7) is fed while peristaltic.
At this time, the base paper feeding roller (39) is provided with a stencil base paper (7).
Followed by.

To the right of the plate cylinder (2) is provided a plate discharge device for peeling the stencil sheet (7) after printing from the plate cylinder (2) and discharging it. The plate discharge device is provided with a pair of plates for contacting and separating the plate cylinder (2) to separate the stencil sheet (7) after printing from the plate cylinder (2) and to transfer it into the plate discharge box (43). Plate discharge rollers (44) (45) are provided. The plate discharge box (43) is the device body (1).
When the stencil sheet (7) is filled with the stencil sheet (43), the stencil sheet (7) is horizontally withdrawn from the apparatus main body (1) and the lid body By opening (46), the stencil sheet (7) inside can be easily discarded.

A document reading device (48) for optically and electrically reading the document (47) is provided above the plate discharge box (43). The original (47) is attached to the original reader (48).
A first document transfer roller pair (49) (50) and a second document transfer roller pair (51) (which rotate in synchronization with each other for horizontally transferring the document on the upper surface of the apparatus body (1). Five
2) are installed side by side. These document transfer roller pairs (4
9) (50), (51) (52), lower roller (50),
(52) is a pulley (5) of the stepping motor (54) via a timing belt (53) (partly not shown).
5) connected to. Both document transfer roller pairs (49) (5
Inside the 0), (51) and (52), a micro switch (56) for detecting the document (47) is provided.

An image pickup device (58) equipped with a charge transfer device (CCD) is provided below the substantially central portion of the pair of document transfer rollers (49) (50), (51) (52), and the upper part thereof. Manuscript (4
A guide (59) for holding the upper surface of 7) is provided.
On the upper right side of the device body (1), the original (47)
An original placing tray (60) for holding the document is detachably attached. In addition, a recess (61) is provided on the upper surface of the upper cover (38) for placing the document (47) after imaging.

The original document image optically read by the image pickup device (58) is converted into an electric signal, amplified, and input by the well-known means to the thermal head (13).

Below the plate discharge box (43), there is provided a paper feeding device for feeding printing paper.

In the device body (1), the recesses (63) (64) of the support arm (62) are provided with pins (65) (66) so that the free ends thereof project outward in the upstream direction along the sheet feeding direction. ) Is detachably engaged. A support shaft (67) is laterally provided near the free end of the support arm (62), and a side wall near the upstream end of the paper feed table (68) is rotatably supported by the support shaft (67). Has been done. Therefore, the paper feed table (68) can be attached to and detached from the apparatus body (1) together with the support arm (62).

A support shaft (69) is rotatably provided below the paper feed table (68), and a base end portion of a push-up lever (70) is fixed to a central portion of the support shaft (69). A sector gear (71) is rotatably fitted on the support shaft (69). A motor (72) and a reduction gear case (73) are fixedly installed in the device body (1), and an idler gear (74) is provided between the reduction gear case (73) and the sector gear (71). It is rotatably installed.

Reference numeral (75) denotes a sheet contact plate curved in an arc shape that faces the swing locus of the downstream side edge of the sheet feed table (68) and has a small clearance, and is on the sheet feed table (68). The downstream edge of the stack of sheets is configured to come in contact with the sheet in a vertically slidable manner. At the upper end of the paper contact plate (75), a rubber paper feed roller (76) for feeding the papers stacked on the paper feed tray (68) one by one, The rotation shaft (77) of the paper feed roller (76) is connected to a paper feed mechanism (not shown).

The downstream side free end of the paper feed table (68) is
A spring (not shown) that biases clockwise (upward) is provided so that the sheets stacked on the paper feed tray (68) are directed toward the paper feed roller (76) (upward) by this spring. Has been pressed.

When all the printing paper on the paper feed tray (68) is fed or a paper jam occurs, the motor (72) rotates and the paper feed tray (68) resists against the spring. It rotates clockwise and returns to the initial posture.

On the downstream side (left side) of the paper feed roller (76) in the paper feed direction, the printing paper fed by the paper feed roller (76) is temporarily stopped and then the timing is checked. A second pair of paper feed rollers (78) (79) for re-feeding to the transfer section of the plate cylinder (2) is provided.

At the lower part of the plate cylinder (2), the second paper feed roller (7
8) A press roller (80) for transferring printing ink is provided on the printing paper re-fed by (79). The press roller (80) is configured to selectively come into pressure contact with only the printing area of the plate cylinder (2).

The printing paper on which the printing ink has been transferred (printed) is further transported to the downstream side by the plate cylinder (2) and the press roller (80) and is stacked on the known paper discharge tray (81). . (82) is a main motor.

Therefore, in order to execute the plate-making printing operation in the normal plate-making printing mode (the mode of making and printing one original document image on one stencil sheet (7)) according to the present embodiment, first, the original (47 ) Is laid face down on the upper surface of the apparatus main body (1) with the surface to be printed facing down, from the right side of the first document transfer roller pair (49) (50) to the left side (direction a). It may be inserted and a start switch (not shown) may be operated. Then, the motor (54) rotates, and accordingly, the pair of document transfer rollers (49) (50), (51) (52) rotate, and the document (47) moves and scans on the imaging device (58). To do. At this time, the image pickup device (58) is operating, and the original image to be printed is converted into an electric signal, amplified, and input to the thermal head (13). Therefore, the heating elements of the thermal head (13) selectively generate heat corresponding to the original image.

On the other hand, while the document reading device (48) is reading the document (47), the platen roller (15), which is in pressure contact with the thermal head (13) through the stencil sheet (7), is the document transfer roller. It rotates in synchronism with the pair (49) (50), (51) (52), and the original image is made as it is on the stencil sheet (7).

The prepared stencil sheet (7) is the capstan (25).
While being nipped by the pinch roller (27), it is further transported to the downstream side. At this time, since the swing guide (29) has a horizontal posture (solid line) and the course changing guide (31) is also located at the lower side (solid line), the stencil sheet (7) is further horizontal. Although it is transported, the base paper feeding roller (39) is still stopped at this point, and its downstream end is blocked from proceeding and bends upward.

When the stencil sheet (7) bends and its presence is detected by the photo sensor (37), the sheet feeding roller (39) rotates as described above, and its downstream end portion It reaches the bottom of the set hook (5) of the plate cylinder (2). Then, the stencil sheet (7) is detected by the photosensor (91) attached to the guide (90) fixed to the upper cover (38), the set hook (5) is closed, and then the set hook (5) is closed. As described above, the plate cylinder (2) slowly rotates clockwise,
The stencil sheet (7) after plate making is wound around the plate cylinder (2). After that, the stencil sheet (7) is cut by the cutting device (16) at a predetermined position on the upstream side.

Thus, the printing of the required number of sheets is completed, and during the stop, the stencil sheet (7) after printing is still wound around the plate cylinder (2), but the plate-making printing operation of the second cycle is started. Then, first, the set hook (5) is automatically or manually opened, and the stencil sheet (7) wound around the plate cylinder (2) is removed by the plate discharging device. After the stencil sheet (7) is removed from the plate cylinder (2), the set hook (5) is once closed, but when the plate cylinder (2) is rotated, it is opened again when it reaches the top. Then, the standby state for the stencil sheet (7) in the second cycle is entered.

Next, according to this embodiment, a multi-mode (for example, one B4
A plate-making process in the case where the plate-making printing operation is executed in a mode in which two B5-size originals (47) are continuously printed on two stencil sheets (7) of the size (7) will be described. In this case as well, the printing process is the same as in the case of the normal plate-making printing mode, and the description thereof is omitted.

FIGS. 5A and 5B show the original (47) in the mode (see FIG. 1) in which the B5 size original (47) is forward-scanned (shown in the direction a) for the first time in one cycle. FIG. 3 is a schematic diagram showing the movement mode of the stencil sheet (7) and the relationship between the original document image and the plate-making image, as viewed from the back side of the stencil sheet (7).

Further, FIGS. 6 (a) and 6 (b) show the document (47) in the mode (see FIG. 4) in which the document (47) is forward-scanned (shown in the c direction) for the second time in one cycle. FIG. 3 is a schematic diagram showing the movement mode of the stencil sheet (7) and the relationship between the original document image and the plate-making image, as viewed from the back side of the stencil sheet (7).

FIG. 7 is a time chart showing the relationship between the image pickup timing and the plate making timing.

First, a mode change-over switch (not shown) is switched to the multi-mode, and the original (47) is laid down on the upper surface of the apparatus main body (1) with the surface to be printed facing downwards.
The document transfer roller pair (49) (50) may be inserted from the right side to the left side, and a start switch (not shown) may be started.

Then, the motor (54) rotates in the normal direction, and accordingly, the pair of document transfer rollers (49), (50), (51) and (52) also rotate in the normal direction, and the document (47) captures the document (47). The first forward scan is executed upward in the a direction. At this time, the original (4
The presence of the left side edge of 7) is detected by the micro switch (56), and when it moves forward by 15 mm, the image pickup device (58) starts the image pickup operation (at the same time, the platen roller (15) starts rotating and the thermal The head (13) also starts the plate making operation.).

Then, the original document image is made in the first area on the downstream side of the stencil sheet (7) (see FIG. 5B), and the absence of the right side edge of the original document (47) causes the microswitch (56) to exist. Is detected, and further forward by 15 mm, the motor (54) reverses,
Along with this, both document transfer roller pairs (49) (50), (51)
(52) is also reversed. Then, the original document (47) moves back on the image pickup device (58) in the b direction, but at this time, the image pickup device (58) becomes inoperative and the platen roller (1
5) is also stopped. After that, when the absence of the left edge of the document (47) is detected by the microswitch (56), the motor (54) is rotated in the normal direction again, and the second forward movement is performed at the same timing as described above. Scan (direction c) is executed.

Then, as in the first forward scan,
The same original document image as the above is made in the second area on the upstream side of the stencil sheet (7) (see FIG. 6B).

Then, the document (47) imaged twice is placed in the recess (61) on the apparatus body (1).

Next, the steps in the case of executing only the plate making operation according to the present embodiment will be described.

The image capturing operation of the original (47) and the plate making operation of the stencil sheet (7)
There is no difference from the plate-making printing operation described above.

The difference is that the solenoid (32) for driving the course changing guide (31) is energized to move the course changing guide (31) upward (chain line), and the swing guide (29) also moves clockwise. It is a point that is biased to (chain line).

In this way, when the course change guide (31) is located above, the stencil sheet (7) after plate making fed by the capstan (25) and the pinch roller (27) changes the course. It makes a U-turn downward along the guide (31) and is placed on the conveyor (33). Then, stencil paper (7)
Is transferred to the base paper outlet (34) of the apparatus main body (1) by the conveyor (33), and is guided to the base paper placing tray (35) from the base paper outlet (34).

Therefore, it is possible to take out the stencil sheet (7) after the plate making and mount it on another printing machine.

In this embodiment, one micro switch is used as the detection means for the original (47) and the original (47) is transported by the stepping motor, but two micro switches may be used.

(G) Effect of the Invention According to the present invention, when an original having a small area is made on a stencil sheet having a large area, the original reciprocates at least 1.5 times, so that a plurality of identical calligraphic images are made on the stencil sheet. It will be.

Therefore, the plate making efficiency is improved, and the printing paper can be saved accordingly.

Further, since the document is only reciprocated 1.5 times, a simple structure, a highly reliable and inexpensive plate making apparatus can be realized.

Further, since it is not necessary to store the entire original image, a large capacity memory is not required, which can contribute to cost reduction.

[Brief description of drawings]

Each of the drawings shows an embodiment of the present invention, FIG. 1 is an internal configuration diagram, FIG. 2 is an external perspective view, FIG. 3 is a perspective view with an upper cover opened, and FIG. 4 is FIG. 5 and 6 are schematic diagrams showing the relationship between the original and the stencil sheet, and FIG. 7 is a time chart. (1) …… Main unit, (7) …… Stencil sheet, (13) ……
Thermal head, (15) …… Platen roller, (25)…
… Capstan, (27) …… Pinch roller, (47) ……
Manuscript, (48) …… Original reading device, (49) (59) …… First
Document transfer roller pair, (51) (52) ... second document transfer roller pair, (56) ... micro switch, (58) ... image pickup device.

Claims (4)

[Claims] 1. An image pickup means for reading a written image on a surface of a document to be plate-made and converting it into an electric signal, a document transfer means for scanning the document at an image pickup position, and an output signal from the image pickup means. Is input to the stencil sheet, the thermal head has linearly arranged heating elements for making a stencil sheet, and the stencil sheet is slidably in contact with the stencil sheet while the stencil sheet is substantially aligned with the arranging direction of the heating elements. In the plate making apparatus provided with a base paper transfer means for transferring in a direction orthogonal to, the document transfer means is provided with means capable of reciprocating the document at least 1.5 times, and the image pickup means is provided only when the document is moved forward. An apparatus for making a stencil sheet, which is configured so as to be able to image. 2. A document reciprocates at least 1.5 times in one cycle, and at the time of the first forward movement of the document, the written image of the document is made into a partial area of the stencil sheet and then the second forward movement. Sometimes
The stencil sheet plate making apparatus according to claim 1, wherein the stencil sheet image of the original is formed on another area of the stencil sheet. 3. A document transfer means is provided on each side of the image pickup means.
Claim 1 which is a paired transfer roller
An apparatus for making a stencil sheet according to item 2 or item 2. 4. The stencil sheet making apparatus according to claim 1, wherein the original feeding means is provided on the upper surface of the apparatus main body.