JPH041045A - Web-guiding device for rotary printing machine - Google Patents

Abstract

PURPOSE:To manufacture the title device in simple, compact design at low costs with a driving motor eliminated by a method wherein a web holder is driven through a power transmitting means that is driven on driving force provided by a roller for a rotary printing machine. CONSTITUTION:A cooling roller 11 is driven with a driving device, with drive rollers 24 being in contact with flanges 26 of the roller 11 by operation of an operating handle 30, and thereby the rotation of the cooling roller 11 is transmitted to small sprockets 15. As the speed of the rotation transmitted to the small sprockets is increased by differences of outer diameters of each of sprockets 18, 20 and 22, the travel speed of chains 6 is faster to some extent than the travel speed of a web 5. In the case where excessive tension is applied to the web, the drive rollers 24 and the cooling roller 11 start to slip each other by operation of helical tension springs 28 adjusted with adjusters 29 of a transmissibility adjusting device, and thereby the web 5 can be prevented from severing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a paper threading device used in a rotary printing press, and more specifically, the present invention is aimed at simplifying the mechanism and improving paper threading performance.

<Prior Art> In large rotary printing presses (hereinafter referred to as rotary presses), a paper threading device has conventionally been used to guide a web (wrapped paper) into the inside of the machine body.

In the example shown in FIG. 5, the paper threading device 1 is configured to guide the web 5 to the dryer device 3 and the cooling device W4 of the rotary press 2. In FIG.
The holder drive chain (hereinafter referred to as chain) 6 is the main component of the holder. Two chains 6 are provided in parallel on the left and right, one on the left side of the dryer device 3 and one on the upper right side inside the cooling device 4. It is driven by two motors 7 and moves in the direction shown by the arrow. After running alongside the web 5 (indicated by a solid line) in the dryer W3 and the cooling device 4, the chain 6 runs alongside the web 5 at the top of the cooling device 4.
and is guided by four guide rollers 8 to be reinstalled in the device 3.
．． 4 and merges again at the left end of the dryer device 3.

As shown in FIGS. 6 and 7, a web holder (paper threading bar) 9 is connected between the left and right chains 6. In front of the dryer device 3, the web 5 is folded back at its end, wound around a web holder 9, and fixed with double-sided tape 10. When the chain 6 runs, the web 5 passes through the path (conveyance path) shown by the solid line in FIG. 5, and is cut by a cutter or the like at the top of the cooling device 4, thereby being separated from the web holder 9 and the paper threading is completed. That's what I do.

<Problems to be Solved by the Invention> A plurality of (three in the illustrated example) cooling rollers 11 are provided in the cooling device 4 of the rotary press 2 in order to cool the web 5 heated by the dryer 3. ing.

Since these cooling rollers 11 have a large diameter and a large weight, they are driven to rotate in synchronization with the running of the web 5 by a motor (not shown). The cooling roller 1] is activated together with the paper threading device W1, and the web 5 is wound around the cylinder of the cooling roller 11 as shown in the figure.

However, in the rotary press 2 described above, the path of the paper threading device 1 (
For example, the running speed of the chain 6 is controlled by the rotation of the cooling roller 11 and the rotation of the cooling roller 11 by the two motors 7. Although these motors 7 are synchronized, it is unavoidable that slight differences in the number of rotations or irregularities in rotation occur between the motors 7. As a result, the difference in the relative speed of the web 5 with respect to the cooling roller 11 becomes larger or smaller than a predetermined amount, which may cause wrinkles due to sagging or meandering, or the web 5 may be cut.

In addition, the paper threading device 1 described above has two motors 7, four guide rollers 8, etc. in addition to the chain 6 and the web holder 9, so the mechanism is large-scale and the manufacturing cost is high.
Moreover, the number of man-hours required for maintenance and maintenance was also large.

The present invention was made in view of the above situation, and an object of the present invention is to provide a paper threading device for a rotary press that has a convenient and inexpensive configuration and has excellent paper threading performance.

Means for Solving the Problem> Therefore, in order to solve this problem, the present invention provides a paper threading device for a rotary printing press that guides a web held by a web holder to a web conveyance path in a rotary printing press, comprising: a web holder driving means for transporting the web holder along the web conveyance path; a power transmission means for transmitting the rotational force of the roller of the rotary printing press to the web holder driving means at an increased speed; and the roller and the web holder driving means. We propose a paper threading device for a rotary printing press, characterized by comprising power transmission rate adjusting means for varying the power transmission rate of the power transmission means in order to change the relative circumferential speed between the web holder driving means and the web holder driving means. It is something.

<Operation> The rotational force of the roller is transmitted to the web holder drive means by the power transmission means in synchronization and at increased speed, and the web holder holding the web is transported along the web conveyance path, while
The rotational force of the web driving means is controlled by the power transmission rate adjusting means so that an appropriate tension is applied to the web.

<Embodiments> Two embodiments of the present invention will be specifically described based on the drawings. In the description of the embodiment, the same members as those in the conventional example described above will be denoted by the same reference numerals, and redundant explanation will be omitted.

FIG. 1 shows a side view of a main part of a rotary printing press employing a paper threading device according to a first embodiment of the present invention, and FIG. 2 shows an enlarged cross section taken along line A-A in FIG.

As shown in these figures, the paper threading device 1 of the first embodiment is built into a cooling device 4. The chain 6 is wound around a large sprocket 14, which has a slightly larger diameter than the cooling roller 11, and is rotatably supported by the rotating shaft 12 of the cooling roller 11 via a bearing 13.
The chain 6 is further wound around six small sprockets 15 of small diameter to form a loop. In the figure, 33 is a tension sprocket that applies a predetermined tension to the chain 6.

The small sprocket 15 at the top is fixed to a driven sprocket shaft 17 rotatably supported by the left and right frames 16 of the cooling device 4 . The sprocket rotates together with a driven sprocket 18 having a smaller diameter than the small sprocket 15, which constitutes a part of the power transmission device which is the power transmission means of this embodiment.

The power transmission device consists of two parts (upper side and lower side), and the upper side has a driven sprocket (
In addition to 18 (hereinafter referred to as the 3rd sprocket), this 3rd sprocket
The third chain is connected to the sprocket 18 by one intermediate chain (hereinafter referred to as the second chain).
It consists of an intermediate sprocket (hereinafter referred to as a second sprocket) 20, which has a smaller diameter than the sprocket 18, and a tension sprocket 31. The second sprocket 20 is of a double-row type on which two rows of chains are wound, and is rotatably held on a second sprocket shaft 21 supported by the left and right frames 16.

The lower side of the power transmission device includes a second sprocket 20 and a drive chain (hereinafter referred to as the first chain) that is wound around the second sprocket 20 and the lower drive sprocket (hereinafter referred to as the first sprocket) 22.
23, consists of a drive roller 24 and a tension sprocket 25, which rotate together with the first sprocket 22. The outer periphery of the drive roller 24 is formed of a material with a high friction coefficient such as rubber, and rotates in contact with a flange 26 having a slightly smaller diameter than the cooling roller 11 which rotates integrally with the cooling roller 11.

In the power transmission device of this embodiment, the rotation of the cooling roller 11 is controlled by the drive roller 24, that is, the first sprocket 2.
2 to the second sprocket 20 via the first chain 23
It is further transmitted to the third sprocket 18, that is, the small sprocket 15, via the second chain 19.

At that time, the speed is increased by the difference in outer diameter between the small sprocket 15 and the third sprocket 18, and between the third sprocket 18 and the second sprocket 20.

The outer diameter of the flange 26 is slightly larger than the outer diameter of the cooling roller 11, so it has a deceleration effect, but this deceleration is smaller than the speed increase described above, and the overall speed is increased.

On the other hand, the second sprocket shaft 21 is integrally attached with an adjustment lever 27 that constitutes a part of a transmission rate adjustment device, which is a power transmission rate adjustment means in this embodiment. The drive roller 24 and first sprocket 22 described above are rotatably attached to the lower end of the adjustment lever 27, and a tension coil spring 28 provided between the frame 16 and the adjustment lever 27 allows the drive roller 2
4 is pressed against the flange 26 so that the force is kept constant. In the figure, 29 is the tension coil spring 2.
8, the push of the drive roller 24 is an adjuster for adjusting the force. Reference numeral 30 denotes a detachable handle that is integrated with the second sprocket shaft 21, and after the threading of the web 5 is completed, contact between the drive roller 24 and the flange 26 can be broken by operating the detachable handle 30. However, as shown in Figure 2,
In this embodiment, in addition to the chain 6 serving as the web holder driving means, a pair of power transmission means and a power transmission rate adjustment means are provided on each side.

The operation of this embodiment will be described below.

In the paper threading device of this embodiment, the web 5 is fixed to the web holder 9 not to the dryer device 3 but before the cooling device 4. Note that since the web 5 is not bent inside the dryer device 3, the paper can be threaded relatively easily. The method of fixing the web 5 to the web holder 9 is the same as that of the conventional method.9 Next, in this embodiment, the cooling roller 11 is fixed with the drive roller 24 in contact with the flange 26 by operating the attachment/detachment handle 30. is driven by a drive means (not shown). Then, as mentioned above, cooling roller 1
1 rotational force is applied to the drive roller 24 via the flange 26.
and further to the first chain 23. 2nd sprocket 20. The third sprocket 18 via the second chain 19
That is, it is transmitted to the small sprocket 15.

As described above, the rotation of the small sprocket 15 is transmitted at an increased speed due to the difference in outer diameter between the sprockets 18, 20, 22, so that the running speed of the chain 6 is slightly higher than that of the web 5. As a result, web holder 9
A predetermined tension is generated in the web 5 being pulled by the web 5, but by adjusting the spring force of the tension coil spring 28 in the transmissibility adjustment device with the adjuster 29,
When excessive tension is applied, slip occurs between the drive roller 24 and the cooling roller 11, and cutting of the web 5 can be prevented. In addition, since the power transmission device operates in synchronization with the cooling roller 11, the web 5
The ratio of the relative speed between the cooling roller 11 and the cooling roller 11 is always constant, and uneven rotation does not occur at all.

In this embodiment as well, after the web 5 has passed through the paper threading path, the web 5 is cut from the web holder 9 with a cutter or the like, and the paper threading is completed, as in the conventional apparatus.

In the embodiment described above, the driving force of the web holder driving means is applied to the flange 26 which rotates together with the cooling roller 11.
This makes it possible to always apply appropriate tension to the web 5 when it passes through the paper threading path, thereby preventing wrinkles caused by slack or meandering of the web 5 and cuts caused by excessive tension. Prevention has become possible.

Next, a second embodiment of the present invention will be described with reference to a side view of the main part in FIG. 3 and FIG. 4 (an enlarged cross section taken along line BB in FIG. 3).

As shown in these figures, the paper threading device of the second embodiment is also built into the cooling device 4, and the path of the chain 6 is also the same as that of the first embodiment. Therefore, redundant descriptions will be omitted, and the structure and operation will be explained only for the different parts.

The difference between this embodiment and the first embodiment is that, as shown in the figure, the drive roller 24 rotates in direct contact with the cooling roller 11. Therefore, although the overall length of the cooling roller 1 is slightly longer, there is no need to provide a flange on the rotating shaft 12, so the number of parts and costs can be further reduced compared to the first embodiment. Other differences include the drive roller 24 (
That is, a compression coil spring 32 is used as a member for urging the adjustment lever 27) toward the cooling roller 11. Therefore, the adjuster 29 also operates not to pull the compression coil spring 32, but to compress it and vary its overall length.

The operation of the second embodiment is substantially the same as that of the first embodiment, so a description thereof will be omitted.

Although the description of the specific embodiment is completed above, the aspect of the present invention is not limited to this embodiment.

For example, in the above two embodiments, the present invention is applied to a paper threading device built into a cooling device, but it can also be applied to a paper threading device built into a printing unit, a folding machine, etc., or the conventional paper threading device mentioned above. It may be applied to a paper threading device installed between multiple devices (such as a dryer device and a cooling device), such as a paper threading device, and as a roller serving as a driving source.
Although a cooling roller was used in the above embodiment, other rollers such as an ink roller or a blanket roller may be used.Furthermore, in the above embodiment, a power transmission device consisting of an upper part and a lower part is used as a power transmission means. However, this may be an integral type, or the power transmission rate adjusting means may be constructed of a member other than the adjusting lever or the spring.

<Effects of the Invention> According to the paper threading device for a rotary printer according to the present invention, the roller for the rotary printer is used as a drive source and the web holder is driven via the power transmission means, so that the device can be improved by omitting the drive motor. While it is possible to be smaller, simpler, and lower in cost, the relative peripheral speed of the web holder to the roller can be adjusted using a power transmission rate adjustment means, which has the effect of preventing web wrinkles and cuts during paper threading. play.

[Brief explanation of the drawing]

FIG. 1 is a side view of main parts of a rotary printing press that employs a paper threading device according to a first embodiment of the present invention, and FIG.
-A is an enlarged sectional view. Further, FIG. 3 is a side view of a main part of a rotary printing press employing a paper threading device according to a second embodiment of the present invention, and FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. FIG. 5 is a schematic diagram of a conventional paper threading device, and FIGS. 6 and 7 are a plan view and a side view of the chain and web holder. In the drawing, 4 is a cooling device, 5 is a web, 6 is a drive chain, 9 is a web holder, 11 is a cooling roller, 14 is a large sprocket, 15 is a small sprocket, 16 is a frame, 17 is a driven sprocket shaft, 18 is a driven sprocket , 20 is an intermediate sprocket, 21 is a second sprocket shaft, 22 is a drive sprocket, 23 is a drive chain, 24 is a drive roller, 26 is a flange, 28 is a tension coil spring, 29 is an adjuster, 30 is a detachable handle, 32 is a compression coil spring. Figure 1

Claims (1)

[Scope of Claims] A paper threading device for a rotary printing press that guides a web held in a web holder to a web conveyance path in a rotary printing press, comprising: a web holder drive that conveys the web holder along the web conveyance path; means, a power transmission means for increasing the speed and transmitting the rotational force of the roller of the rotary printing press to the web holder driving means, and changing the relative circumferential speed between the roller and the web holder driving means, A paper threading device for a rotary printing press, comprising a power transmission rate adjusting means for varying the power transmission rate of the power transmission means.