JPS5911496B2 - Paper feed positioning device in printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing press equipped with a paper feed positioning device.

Although the paper feed positioning device according to the present invention can be applied to various types of printing presses, in the following description, a printing press having a cylindrical printing surface, that is, a printing drum, is moved back and forth by a driving means. An example of application to a modern drum printing press is shown. Note that the driving means does not constitute an essential part of the present invention. The invention is suitable for printing machines of the type in which the paper to be printed is fed to a first position and from there to a second position, usually referred to as the registration position.

The paper fed to the first position is typically locked against a first lock. When the leading edge of the paper is locked in the first catch, the paper is substantially aligned inside the printing press. However, even if the leading edge of the paper contacts the first stopper, the leading edge is often beyond the second or alignment position, so the leading edge of the paper is moved backwards and It is necessary to ensure that the ends are placed in the second or aligned position. Doing so is most conveniently accomplished by providing a second catch on the drum. These second stops are arranged so that the paper can be moved somewhat backwards with respect to the registration position, so that the paper is immediately returned to the registration position. The paper is firmly held by a gripping device during the printing process, or at some point during the printing process. However, such an arrangement only ensures that the paper is sent to the second position if it is made of a rigid material.

If the paper is thin and made of a relatively resilient material, it is difficult to accurately place the paper in alignment. This is because applying enough force to the leading edge of a thin sheet of paper to move the entire paper backwards toward the alignment position will cause the leading edge to bend against the second stop. be. The thin paper thus substantially follows the same position as it did when it contacted the first stop. The difference in their position is, of course, only on the order of a few millimeters, but it produces undesirable results, especially in multicolor printing presses. In this regard, even if the second fastener is conveniently extended over the entire width of the paper, this will only complicate the structure and will not produce the desired result. The object of the invention is to provide a means by which the above-mentioned disadvantages can be greatly reduced and, moreover, even if the paper is quite thin, its leading edge can be precisely placed in the alignment position. That's true.

Accordingly, the present invention generally relates to a printing press having a paper feed positioning device, the leading edge of said paper being in a first position, i.e. from which point the paper is moved somewhat by means of locking means. the sheet of paper is moved rearwardly into a position where it is fed to a second position, an alignment position, and the paper is in a position where it can perform an alignment operation when it is in the first position. The leading edge of the paper is pressed against the printing surface by one or more pressing means having a free end extending beyond the leading edge of the paper, and wherein the locking means is connected to the pressing means. and a leading edge of the paper to the alignment position. Other features of the invention will become apparent with reference to the following two examples.

The drawings show an embodiment in which the present invention is applied to a printing press having a cylindrical printing surface.

In the printing press, the printing surface can be reciprocated by a drive means (not shown). Such printing machines usually include a silk sheet that can reciprocate horizontally as the cylinder rotates.
Although a screen frame, a rubber roller, or an ink supply device are provided, these frames, a squeegee, and an ink supply device are not shown for the sake of simplicity. FIG. 1 shows a side view of a known paper feed positioning and setting device.

The alignment position in the paper feed positioning device is indicated by the number R, but in the state shown in FIG.
a is beyond the matching position R. This condition occurs when the paper 1 is incorrectly aligned and can be brought about in many ways and by various devices. In this embodiment, the alignment operation of the paper with respect to the first position is carried out as the drum or cylinder 4 rotates, leading edge 1a of the paper 1.
This is done by locking the first locking member 2 to the locking surface 2a of the first locking tool 2. After this, the leading edge 1a of the paper is moved from the first position to the second position or alignment position R by the second stopper 3.
sent by. This second locking device 3 is installed on the printing cylinder 4 and, with a change in position or rotational movement of said cylinder, as shown by arrow a, the leading edge 1a of the paper 1 in the first position is attached. It is now possible to contact. This places the leading edge 1a precisely in the registration position R when the paper 1 is moved generally backwards towards the second position. When the paper is in alignment position R (see FIG. 4), the gripping means 6 moves the paper 1 onto the printing cylinder 4.
It works like a grip on top. Therefore, then arrow b
The printing process is started by rotating the cylinder 4 in the direction shown in FIG. As can be seen in FIG. 5, it is a prerequisite for the operation of this printing press that the leading end 1a of the paper 1 is brought into contact with one side part of the first catch 2 by means of the second catch 3. Therefore, the first locking tool is firmly attached to the frame. the paper first
To move from the position to the alignment position, the paper is simply moved backwards by means of the front catch 3, which is in contact with a portion of the leading edge 1a of the paper, without deforming it. It is necessary to be able to do so.

If the paper does not have sufficient strength (if it is too thin), the paper is retracted to the alignment position by the stopper 3 without the leading edge 1a of the paper hitting the stopper 3 and being bent. It is difficult to do so. This means that the paper may not be placed in the aligned position, but may remain in the first position in contact with the first stop 2, as shown in Figure 1. are doing. Even in that case, although the distance between the first position and the second position R shown in FIG. It is clear that this has an undesirable effect on the color printing process. In this invention, a device 5 as shown in FIGS. 2-4 is provided in the printing press in order to precisely align the paper.

The locking means 2 is omitted in FIGS. 2 to 4, and the gripping device 6 is omitted in FIGS. 2 and 3 to simplify the drawings. In FIG. 2, the leading edge 1a of the paper is shown in a first position, ie in a position where it is in contact with the first locking device 2. In FIG.

The device 5 of the invention is attached at one end to a suitable fixture and is adapted to rest against the leading edge of the paper 1, and in this embodiment has its leading end mounted on the printing cylinder 4. It is now possible to keep the pressure on you. Further, the other end of the device, that is, the free end 5a
is provided so as to protrude somewhat from the leading end when the leading end is in the first position and is locked to the locking tool 2, but substantially , are aligned with respect to the leading edge 1a. Such a device 5 is for keeping the leading edge 1a of the paper 1 pressed against the printing surface of the printing cylinder 4, so that the paper is moved into the second position. However, here, the device 5 also serves as a pressing means. The second locking tool 3 is provided at a position facing the device 5, that is, the pressing means, in the circumferential direction of the cylinder, and the printing cylinder 4 is rotated in the direction of arrow a'' in the figure (opposite to the printing rotation direction). When the device 5 is pressed, it not only contacts and pushes the free end 5a of the device 5, but also pushes the leading edge 1a of the paper.As a result, the free end 5a of the device 5 and the paper 1 The leading ends 1a of both are moved into the alignment position R, as shown in FIG. , as soon as the alignment position is reached, it is accommodated in the cylinder 4 by suitable means (not shown).

When this happens, the gripping device 6 acts on the leading edge 1a of the paper 1 and then serves to rotate the printing cylinder 4 in the direction of arrow b and to start the printing stroke. The device 5 and the first catch 2 have then already been rotated away from the printing surface 4 by suitable means (not shown) so that the paper 1 is free beneath them. It is now possible to pass. FIG. 5 is a perspective view of a printing press constructed according to the present invention.

In this figure, the paper 1 is in the same position as in FIG. 2 and is locked by two first locking devices 2. These locks 2 are installed on both sides of the printing cylinder 4. The pressing means 5 are connected to the first locking device 2
, so that the leading end 1a can be pressed against the printing cylinder 4. As shown in FIG. 5, a locking device 3 is installed on the front side of such means 5, that is, in the forward direction of the paper 1, so that the cylinder 4 is rotated more in the direction of arrow a. In this case, the stop 3 comes to rest against the free end 5a of the means 5. The first locking member 2 is pivotally supported by a pin 8' (see FIG. 6) supported by a pair of bearings 81 and 82, and the bearings are further fixed to a common support member 7.

The means 5 are rotatably connected to the pin 8'. A dog 20 in the form of a pin, adjacent to the means 5 and attached to the catch 2, is moved from a position where it acts on the leading edge 1a of the paper 1 when the catch 2 is rotated. At the same time, it is being lifted up. The paper 1 is then free to move, but is supported by the gripping device 6 against the printing surface of the printing cylinder 4. The dogs 20 are individually rigidly attached to the first locking device 2 and on the underside of the means 5,
It extends close to it. Note that the gripping device 6 is not shown in FIG. 5 in order to simplify the drawing.
The means 5, which is a first embodiment of the present invention, consists of a flat plate member that tapers toward its free end 5a, and its side view is shown in FIG.

Such a member 5 is inserted into part 8 and supported by an angle lever 5b. This angle lever 5b is inserted through a gap 8a in the part 8 into a groove 8b which serves as a guide means for the part 5. The free end 5a of the means 5 is biased toward the left in FIG. 6 by the spring 9, but its movement is restricted by the wall portion 8c. Therefore, when the free end 5a is pressed by the locking tool 3, the member 5 is pushed into the portion 8 against the elasticity of the spring 9, but such action by the locking tool 3 is released. 6, the means 5 will be pushed by the spring 9 into the position shown in FIG. The portion 8 has a sliding surface 8d for slidably supporting the members of the means 5, allowing the means 5 to move back and forth. Further, the portion 8 is rotatable about the pin 8'. The means 5 and the first locking device 2 can therefore co-move around the same pin 8/. An additional spring 10 is installed between the part 8 and the fixture 7 in case it is necessary to adjust the pressing force of the means 5 against the leading edge 1a of the paper 1.

This spring 10 is provided so as to be adjustable by a known method, so that the pressing force of the paper 1 against the cylinder surface 4 can be changed. In the embodiment shown, the initial or temporary positioning of the paper 1 is performed by means of a first catch 2 .

The first locks are offset relative to the second locks 3, which is necessary for the operation described above. Although there are disadvantages to such an arrangement, it allows the first alignment position of the paper to be controlled by a different paper leading edge portion than that which controls the second alignment position of the paper. It becomes possible to control. This is effective for paper whose leading end surface is not flat. FIG. 7 shows another modification of the pressing means 5 according to the invention. In this example, the free end 5a of the pressing means 5 is rigidly attached to a pin 8' (see FIG. 6) and is adapted to be placed in one of three positions. The first of these positions is shown in solid lines in FIG. 7, and the second thereof is shown in dotted lines in the same figure. Note that the state in which both the pressing means 5 and the locking tool 2 are in the paper release position is the third position. In this embodiment, the first locking device 2 has an upper end formed by a leaf spring 2.
1, etc., and is supported by the pressing means 5 via rivets 22. In such a configuration, the leaf spring 21 serves as a guide means for the first locking member 2 and also serves as a reinforcing member. In the first position, the first locking means 2 are in contact with the cylindrical surface 4, helping to place the leading edge 1a of the paper 1 in the correct alignment position.

When the pin 8/(not shown in FIG. 7) rotates, the free end 5a of the pressing means 5 is moved downwards,
It is applied to the leading edge 1a of the paper. The second stop 2 is then lightly pressed onto the cylindrical surface 4. In the second position, the catch 3 on the printing cylinder 4 is connected to the catch 2
Since the leading end 1a of the paper 1 is moved by contacting the locking tool 2
The pressing means 5 is then retracted until the paper 1 reaches the alignment position. After this, when the gripping device 6 is actuated and with it the catch 3 is drawn into the printing cylinder 4, the pressing means 5 as well as the catch 2 are both moved to release the paper 1. From the above, the free end 5a of the pressing means 5 according to the present invention serves to reinforce the free end 1a of the paper 1, and also serves as an auxiliary member of the locking tool 2. It will be recognized that they are helping to be moved together.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a paper feed positioning device of a known printing press, FIG. 2 is a same diagram showing a paper feed positioning device comprising a pressing means according to the present invention, and FIG. 3 shows the pressing means and The same figure shows the paper in the alignment position, FIG. 4 shows the paper being held by the gripping device against the printing surface, and FIG. 5 shows the printing machine in the state shown in FIG. 2. 6 is a sectional view taken along the - line in FIG. 5, and FIG. 7 is a schematic side view showing a paper feed positioning device comprising another pressing means according to the present invention. 1...paper, 1a...leading edge of paper, 2.
...First locking tool, 3...Second locking tool, 4...Printing cylinder 5...Pushing means, 5a... ... Pushing means end, R ... Alignment position.

Claims (1)

[Claims] 1. A cylinder having a cylindrical printing surface to be driven back and forth, on which the printing paper is placed, and a leading end of the printing paper 1 fed along the printing rotation direction of the cylinder, a first locking tool 2 for locking at a first position on the printing surface of the cylinder occupying a first angular position; It is biased so as to protrude slightly beyond the leading edge of the printing paper 1 locked by the first locking tool 2, and the lower surface positions the printing paper 1 relative to the printing surface. A pressing means 5 is adapted to press the first locking tool 2 and the pressing means 5 so as to be brought into contact with each other in an adjustable manner.
a common support member for supporting each operating position and an operated position separated from the printing paper; and a common support member further protruding from the tip of the pressing means 5 on the printing surface of the cylinder occupying the first angular position. By providing a second locking member 3 that is provided in a position that can freely move in and out of the cylinder, the cylinder can be rotated from the first angular position to the second angular position in the opposite direction to the printing rotation direction, and A printing machine characterized in that the front end of the pressing means 5 and the leading end of the printing paper 1 are pushed back by the locking device 3 of No. 2, and the latter are maintained in an aligned position with respect to the printing surface. Paper feed positioning device.