JPH0643149B2 - Base paper for printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a printing base paper that can be used in a printing apparatus such as a rotary copying machine or an offset printing machine, and in particular, it automatically feeds a plate cylinder. Suitable for printing base paper (hereinafter simply referred to as "base paper"
Say. ).

(B) Conventional Technology Conventionally, it is difficult to distinguish the front side and the back side of the base paper, and there is a risk that the front side and the back side may be mistakenly reversed when mounted on the plate cylinder.

Therefore, for example, as in Gacken GSM-4, the pins on which the base paper is mounted are planted in the plate cylinder at unequal intervals, and the base paper has mounting holes corresponding to the pins. Exists.

In such a base paper, if the front side and the back side are reversed, the pins and the mounting holes do not coincide with each other and cannot be mounted on the plate cylinder properly. Therefore, when the base paper is mounted on the plate cylinder, it is determined whether or not the front and back are appropriate.

The mounting holes for the base paper are all opened equidistantly from the downstream side edge, that is, on a straight line parallel to the edge.

(C) Problems to be solved by the invention As described above, in the conventional technique, it may be noticed that the front and back sides are reversed only after the base paper is mounted on the plate cylinder, but the base paper is manually mounted. If so, this is acceptable. However, in the case of automatic plate feeding, the plate cylinder inside the device body is covered and cannot be seen,
It is necessary to provide a means for detecting whether or not the base paper is properly attached to the plate cylinder, which not only complicates the structure, but also when the front and back of the base paper are reversed, remove the cover of the main body of the device and remove the internal There is a problem that the operation is complicated because the base paper has to be taken out.

Further, only the base paper in which the mounting holes corresponding to the pins planted in the plate cylinder at unequal intervals are formed can be used. Therefore, the plate cylinder and the stencil paper must always correspond one-to-one, and the versatility of the stencil paper is low.

Further, there is a possibility that the base paper to be clamped on the plate cylinder by a so-called clamper is not provided with the mounting holes and may be mounted on the plate cylinder with the front and back reversed.

(D) Means for solving the problem A base paper detection unit is provided which detects the base paper for printing advancing in a fixed direction near the downstream side edge along the direction of travel, at the upstream side position and the downstream side position, respectively. A printing base paper to be supplied to an automatic plate supply means, which detects the front and back sides of the base paper at a position corresponding to the base paper detection means in the vicinity of the downstream end along the traveling direction during plate supply. The base paper for printing is provided with at least two target parts for carrying out the detection, and these target parts are provided at unequal distances from the downstream end of the base paper.

(E) Action In the present invention, at least two detected parts are formed, and these detected parts are provided at unequal distance positions from the downstream side edge of the base paper, so that the detected parts are detected. As a result, the front side and the back side of the base paper can be discriminated before the base paper is mounted on the plate cylinder.

As described above, since the detected portion is provided at an unequal distance position from the downstream side edge of the base paper, by taking the logical product of the outputs of the detection means for detecting each detected portion, The front and back are distinguished.

(F) Example FIG. 1 is a plan view showing a known base paper (1) in which the “plurality of detected parts” which are the main parts of the present invention are not formed.
In this base paper (1), a hard strip-shaped selvage (2) is attached to the downstream end (the left end in the figure) along the traveling direction during plate feeding. A plurality of mounting holes (3) ... Are provided in parallel with the edge.

FIG. 2 shows the first embodiment. In each of the following figures, the separation diagram A is a plan view showing a state where the surface of the base paper (1) is fed in a posture in which the surface is located above, and the separation diagram B is a plan view showing a state in which the front and back sides are reversed. is there. Further, in the embodiment shown in FIGS. 2 to 8, the base paper is not provided with a mounting hole, and is clamped by a so-called clamper provided on the cylinder plate.

In FIG. 2A, the front and back sides of the base paper (1) are attached to both side ends of the base paper (1) on the downstream side (hereinafter, simply referred to as “downstream side”) along the traveling direction during plate feeding. A pair of cutouts (4) and (5) as a detected part for detecting the are removed. Of the pair of notches (4) and (5), the notch depth of the left notch (4) (the distance from the downstream edge of the notch to the downstream edge of the base paper (1)) l ₁ and the right notch (4) Notch (5) depth of cut l ₂ and l ₁ > l
As ₂ the relationship occurs, in particular l ₁ = 20 mm, l ₂
It is set to 10 mm.

Then, a pair of light transmissive photocouplers (6) (7) as a base paper detecting means are provided in a portion of the apparatus main body (not shown) corresponding to the notches (4) (5). , The logical product of the signal 1 output by blocking the light of the first photocoupler (6) on the left side and the output signal (1 or 0) from the second photocoupler (7) at that time is Configured to be taken. That is, if the output signal from the second photocoupler (7) is 1 at the time when the output signal from the first photocoupler (6) becomes 1, the logical product becomes 1 and the base paper
As shown in FIG. 2A, it is determined that the plate (1) has been normally supplied, and the subsequent steps are executed.

However, as shown in FIG. 2B, when the front and back of the base paper (1) are fed in the opposite posture, the output signal from the first photocoupler (6) becomes 1, The output signal from the second photo coupler (7) is still 0, and the logical product is 0.
Thus, it is determined that the front and back sides of the base paper (1) have been fed in the opposite posture, the execution of the subsequent steps is stopped, and a display to that effect is displayed.

As is clear from the figure, the first photocoupler (6)
Is the second photo coupler (7) along the direction of travel of the base paper (1).
Since the base paper (1) is located on the upstream side, the base paper (1) is detected at the upstream side position and the downstream side position in the vicinity of the downstream side edge of the base paper (1).

FIG. 3 shows a second embodiment. In this embodiment, one of the detected portions is formed by a notch (8) having a cutting depth of l ₂ as in the first embodiment, and the other detected portion is the downstream edge of the base paper (1). Rectangular through hole opened at a distance l ₁ from
It is formed in (9).

The action of these detected parts (8) and (9) is based on the logical product of the outputs from the first and second photocouplers (6) and (7).
There is no difference from the first embodiment in that the front and back of (1) are distinguished.

FIG. 4 shows a third embodiment. In this embodiment, the detected portion is formed by a rectangular through hole (10) (11), the distance from the downstream edge of the base paper (1) to one through hole (10) is l ₂ , and the distance to the other through hole (11) is set to l ₁ . (12) is a micro switch for detecting the arrival of the base paper (1).

Both of the through holes (10) and (11) are detected by two pairs of corresponding light transmission type photocouplers (6) and (7) as described above. As shown in the figure, the light emitter (13) and the light receiver (14) of the photocoupler are separately provided above the positions corresponding to the through holes (10) and (11), respectively, and are provided at the bottom of the base paper (1). An optical fiber (15) for optically connecting the light projector (13) and the light receiver (14) may be provided.

FIG. 6 shows a fourth embodiment which is a modification of the first embodiment. In this embodiment, the depth of cut is 1 ₁
Is formed by the notch (4), and the other detection portion is formed by the downstream edge of the base paper (1) itself. That is, l ₂ = 0 is set in the first embodiment.

In each of the above embodiments, the light-transmissive photocoupler (6) (7) detects the detected portion, but the detected portion is formed of a light-reflecting member such as aluminum foil. Alternatively, it may be configured to detect this with a light reflection type photocoupler.

FIG. 7 shows two microswitches (16) on the front and back of the base paper (1) in the fifth embodiment similar to the first embodiment.
The state detected in (17) is shown. The operation principle is no different from the case where the photocouplers (6) and (7) are used for detection.

FIG. 8 shows a state in which the front and back of the base paper (1) are detected by one microswitch (18) in the fifth embodiment. In this figure, (19) is a first lever whose base end is swingably mounted on a support shaft (20), and the free end thereof has a notch (5) on the right side of the base paper (1). A tongue piece (21) that abuts against is formed. Further, the base end of a connecting rod (22) that moves in the horizontal direction is swingably connected to the central portion of the first lever (19). (23), an L-shaped second lever whose bent portion is swingably attached to the support shaft (24), and has one end thereof contacting the notch (4) on the left side of the base paper (1). The contacting tongue (25) is formed. Further, a recess (26) which can selectively engage with the free end of the connecting rod (22) is formed in the other end of the second lever (23).

When the base paper (1) is fed in the state shown in FIG. 8,
First, the notch (5) on the right side comes into contact with the first lever (19), which rotates counterclockwise, so that the connecting rod (22) moves slightly to the right. Then, the engagement relationship between the left end of the connecting rod (22) and the recess (26) of the second lever (23) is released. In this state, when the notch (4) on the left side of the base paper (1) contacts the second lever (23), the second lever (23) rotates clockwise and the micro switch (18) operates. . Therefore,
It is detected that the front and back sides of the base paper (1) have been normally supplied.

However, when the front and back sides of the base paper (1) are fed in reverse, the notch (5) on the right side shown in FIG. 8 first comes into contact with the second lever (23). Since the lever (19) has a predetermined posture (the posture shown in FIG. 8),
The recess (26) of the lever (23) and the free end of the connecting rod (22) are engaged with each other, and the clockwise rotation of the second lever (23) is prevented. Therefore, the base paper (1) is prevented from further progressing, and the microswitch (18) does not operate.

9 to 11 are base papers according to the first embodiment.
FIG. 9 shows a concrete means for mechanically and electrically detecting (1), FIG. 9 is a perspective view, and FIGS. 10a and 10b are base papers.
The front view showing the state where the front and back of (1) are normally supplied,
FIG. 1 is a front view showing a state in which the front and back sides are reversely fed.

In these figures, (27) is a first support rod rotatably supported by a chassis (not shown) of the apparatus main body and extending in a direction substantially orthogonal to the plate feeding direction. A second support rod extending in parallel with the first support rod (27) on the downstream side.
(28) is rotatably supported on the chassis. A U-shaped engagement lever (30) biased counterclockwise by a spring (29) is fixed to one end of the first support rod (27). An engaging protrusion (31) is provided so as to project inside the end of the upper arm of the engaging lever (30), and a bending piece (3) is provided at the end of the lower arm.
2) is formed.

Further, at the other end of the first support rod (27), when the front and back sides of the base paper (1) are fed in a normal posture, a free cutout (5) with a depth of cut l ₂ is provided. The first contact arm (33) with which the ends contact is fixed.

A deformed fan-shaped detection lever (34) is fixed to one end of the second support rod (28). An engagement piece (35) capable of selectively engaging with the engagement protrusion (31) is provided at a portion of the detection lever (34) corresponding to the engagement protrusion (31) of the engagement lever (30). It is bent. In addition, the detection lever (34) of the chassis
A pair of photocouplers (36) that allow the light shielding by the detection lever (34) is provided at a portion corresponding to the shoulder portion of the stopper, and a stopper (3) that prevents overrun of the detection lever (34) is provided below.
7) is provided.

The other end of the second support rod (28) has a second contact arm (38) fixed to the downstream edge of the base paper (1), the free end of which abuts.

When the front and back of the base paper (1) are fed in a normal posture,
As shown in FIGS. 9, 10 a, and 10 b, the base paper
The notch (5) on the left side in the sheet feeding direction of (1) is the first contact arm (3
3) Abutting, the engagement lever (30) slightly rotates clockwise against the spring (29). Then, the engagement relationship between the engagement protrusion (31) of the engagement lever (30) and the engagement piece (35) of the detection lever (34) is released. When the base paper (1) further advances, the engagement lever
The bent piece (32) of (30) abuts the side edge of the detection lever (34), and the downstream edge of the base paper (1) abuts the second abutment arm (38), and the lever (30) ) And (34) are both biased counterclockwise (see FIG. 10b). Then, the base paper (1) will have both contact arms.
(33) (38) Go through the lower part and move forward, and at the same time detect lever
(34) is detected by the photocoupler (36), and the output signal from the photocoupler (36) operates the paper feeding means (not shown).

However, when the front and back of the base paper (1) are fed in the opposite posture,
As shown in FIG. 11, the deeper notch (4) with the cutting depth l ₁
Before contacting the first contact arm (33), the downstream edge of the base paper (1) contacts the second contact arm (38). Then, a clockwise rotational force is applied to the detection lever (34), but since the engagement lever (30) and the detection lever (34) are in an engagement relationship, the detection lever (34) and the first contact The arm (38) is prevented from rotating sufficiently in the clockwise direction, and the base paper (1) cannot pass through the lower part of the second contact arm (38) and is prevented from moving forward. Further, at this time, the detection lever (34) does not rotate to the position where the photocoupler (36) shields the light, and no signal is output.

Therefore, when the operator inserts the downstream side edge of the base paper (1) into the main body of the device, if the base paper (1) moves forward smoothly, the front and back sides are in a normal state, but if it does not move forward, that is, it cannot be inserted. In this case, since the front and back are reversed, it is necessary to reverse the front and back of the base paper (1) and insert it again.

In each of the above-described embodiments, the detected portion is provided near both side ends of the raw paper, but it is not always necessary to be near both side ends.

(G) Effect of the Invention In the present invention, since the front and back of the base paper can be detected before being mounted on the plate cylinder, automatic plate feeding becomes easy and reliable.

Also, since the mounting hole does not have to have a special shape,
A highly versatile base paper can be realized.

Further, even if the base paper has no mounting holes, it is easy to distinguish the front side and the back side.

Furthermore, when the operator tries to visually determine the front and back sides of the base paper, it can be done very easily only by visually recognizing the detected portion provided near the downstream end of the base paper.

[Brief description of drawings]

FIG. 1 is a plan view showing a base paper on which a detected portion is not formed, FIGS. 2 to 11 show various embodiments of the present invention, and FIGS. 2A and 2B show the first embodiment, respectively. An example plan view, FIGS. 3A and 3B are plan views of the second embodiment, FIGS. 4A and 4B are plan views of the third embodiment, and FIG. 5 is a photo. FIG. 6A and FIG. 6B are plan views of the fourth embodiment, FIG. 7A and FIG. 7B are plan views of the fifth embodiment, and FIG. FIG. 9 is a plan view of another detection mode of the embodiment, FIG. 9 is a perspective view of the detection means, and FIG.
FIGS. 0a and 10b are front views showing different aspects of the detecting means, and FIG. 11 is a front view showing still another aspect of the detecting means. (1) …… Base paper, (2) …… Ear paper, (4) (5) (8) (9) (10) (11) ……
Detected part.

Claims (6)

[Claims] 1. An automatic plate feeding device provided with a base paper detecting means for detecting a base paper for printing traveling in a fixed direction in the vicinity of a downstream side edge along the direction of travel, respectively at an upstream side position and a downstream side position. A base material for printing supplied to the means, and a detected portion for detecting the front and back sides of the base paper at a position corresponding to the base paper detecting means in the vicinity of the downstream end along the traveling direction during plate supply. The base paper for printing in which at least two are formed, and these detected portions are provided at unequal distance positions from the downstream end of the base paper. 2. The base paper for printing according to claim 1, wherein the detected portion is provided near both side edges of the base paper. 3. The base paper for printing according to claim 1, wherein the detected portion is a notch having different cutting depths in the same direction as the traveling direction during plate feeding. 4. The printing base paper according to claim 1, wherein the detected portion is a light transmission window. 5. The base paper for printing according to claim 1, wherein the detected portion is formed of a light reflecting member. 6. The printing base paper according to any one of claims 1 to 5, wherein a lining paper is attached to a downstream side end portion, and a detected portion is formed on the lining paper.