JPH0286534A - Dancer rolling device for rotary printer - Google Patents

Abstract

PURPOSE:To enable the proper correspondence to the variation of tension by numerically displaying the preset value of the tension in a dancer rolling device for controlling the tension of a printed material such as synthetic resin film. CONSTITUTION:When a printed material 1 is an extensible material, the data for the elongation of the printed material 1 is determined by experiments, and this data is inputted into the control part of a motor 33 as an initial value. The rotary driving source 33 of a screw shaft 29 is operated to rotate the screw shaft 29, which moves a weight 31 in the axial direction of the screw shaft 29 through a nut 30 spirally engaged with the screw shaft 29 to give a load to a dancer roll 3, and the tension is preset. The position of the weight 31 is detected by a contactless switch 38 as a position detecting means for the weight 31, and the detection result is outputted to a numerical display board 39. In the display board 39, the preset value of the tension is calculated from the position of the weight 31 and numerically displayed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a dancer roll device for a rotary printing press, and particularly relates to a dancer roll device for a rotary printing press, and particularly relates to a dancer roll device for a rotary printing press, and particularly for printing on a printing material that is easy to stretch (for example, a synthetic resin film, etc.). The present invention relates to a dancer roll device for a rotary printing press suitable for appropriately controlling tension applied to a material.

[Prior Art] Fig. 4 is a system diagram showing the relationship between a printing material feeding device and a conventional dancer roll device, Fig. 5 is a vertical front view of the conventional dancer roll device, and Fig. 6 is a longitudinal side view of the conventional dancer roll device. It is a diagram.

For example, in a rotary printing press, as shown in FIG. 4, the printing material 1 is passed between a guide roller 2, a dancer roll 3, a feed roll 4, and a rubber roller 5 to be sent to the printing machine (not shown). It has become.

The feed roll 4 is rotationally driven by a DC motor 6 which is a rotational drive source.

Further, as shown in FIG. 6, frames 7, 7' are arranged facing each other at set intervals. This frame 7.7'
As can be seen from FIGS. 5 and 6, there is a bearing 9 in between.
, 9', a dancer roll hinge shaft 8 is rotatably supported. Dancer roll support arms 10.10' are fixed to this dancer roll hinge shaft 8 at set intervals. This dancer roll support arm 10.10
A dancer roll 3 is rotatably supported by a pin 11, 11' between the tip ends. Furthermore, as shown in FIG. 5, a stopper 12.12' is attached to the inside of one frame 7' to regulate the swing angle of the dancer roll 3 via the dancer roll support arm 10'. . As a result, by reversibly rotating the dancer roll hinge shaft 8, the dancer roll 3 is moved via the dancer roll support arm 10.10', as shown in FIG.
It is possible to swing left and right within a range regulated by stoppers 12 and 12'.

Further, the dancer roll hinge shaft 8 is shown in FIG.

As can be seen in FIG. 6, balance weight support arms 13.13' are fixed at set intervals. A balance weight 14 is attached between the tips of the balance weight support arms 13, 13'.

Further, a tension presetting means 15 is provided on the outside of one frame 7'. As shown in FIG. 4, the tension presetting means 15 includes a bellows frame cylinder 16 and an ultra-precision near relay 20 having an air escape portion 20a. The bellofram cylinder 16 is connected to one end of the dancer roll hinge shaft 8 through a piston rod 17 fitted therein and a lever 19 connected to the piston rod through a joint 18. The ultra-precision near relay 20 functions as a kind of pressure regulating valve, and is configured to release the air 21 inside the bellofram cylinder 16 and supply the air 21 into the bellofram cylinder 16. The presetting means 15 rotates the dancer roll hinge shaft 8 clockwise or counterclockwise via the piston rod 17 and lever 19 by increasing or decreasing the air 21 supplied from the ultra-precision near relay 20 to the bellofram cylinder 16. A load is applied in the direction of movement, and tension is preset to the dancer roll 3 depending on the material of the printing material 1.

Furthermore, a synchro transmitter 25 is attached to one end of the dancer roll hinge shaft 8, as shown in FIG. As shown in FIG. 4, this synchro transmitter 25 is connected to the DC motor 6 of the feed roll 4, and detects the swing angle of the dancer roll 3 from the rotation angle of the dancer roll hinge shaft 8. By feeding back the value to the DC motor 6 and increasing/decreasing the feeding speed of the printing material 1, the tension of the printing material 1 is controlled so as to always keep the dancer roll 3 at a constant position.

[Problems to be Solved by the Invention] By the way, in the prior art shown in FIGS. 4 to 6, the tension presetting means 15
6 and an ultra-precision near relay 20, and a piston rod 17 fitted into the bellofram cylinder 16,
A lever 19 connected to this via a joint 18 applies a load to the dancer roll 3 and presets the tension.

As a result, as shown in FIG. 4, at least the dancer roll hinge bearing part 9, the connection part of the connecting pin 14 of the hind 18 and the lever 19, the verofram cylinder hinge shaft part 22, and the piston rod bearing part 23, Rod end bearing part 24, ultra-precision near relay 20, and air escape part 20
Friction and fluid resistance loss occur between a and a.

Therefore, in the prior art, the dancer roll 3 starts to move only when the tension fluctuation exceeds the friction and fluid resistance loss, which slows down the feedback of the feed roll 4 to the DC motor 6. In the case of easy-to-print materials, there was a problem in which the printing register was noticeably misaligned.The object of the present invention is to be able to accurately preset the tension by remote control, and to adjust the tension on the paper during printing after presetting the tension. Even if the tension changes by a minute amount during joints or when increasing/decelerating, this can be reliably detected.
An object of the present invention is to provide a dancer roll device for a rotary printing press that can respond to tension fluctuations.

Still another object of the present invention is to provide a dancer roll device for a rotary printing press that can appropriately preset tension while checking numerical values.

[Means for Solving the Problems] The object is to provide a means for presetting a tension applied to a printing material by a screw shaft rotatably supported;
This is achieved by comprising a weight attached in the axial direction of the screw shaft via a nut and a rotational drive source that reversibly rotates the screw shaft.

Still another object of the present invention is to connect a weight position detection means to the screw shaft, and to the position detection means, a numerical display panel is provided for calculating and displaying the tension of the printing material from the weight detection position. This is achieved by connecting.

[Operation] In the present invention, the rotational drive source of the screw shaft is activated to rotate the screw shaft, and the weight is moved in the axial direction of the screw shaft via the nut screwed to the screw shaft, thereby applying a load to the dancer roll. to preset the tension.

Then, the position of the weight is detected by the weight position detection means connected to the screw shaft, and the detection result is outputted to the numerical display panel.

The numerical display board calculates a tension preset value from the detected weight position and displays it numerically, so that the tension can be preset while visually checking the value.

Thereby, in the present invention, it becomes possible to accurately preset the tension by remote control.

After the tension is preset, if the tension fluctuates during paper splicing or when increasing or decelerating during printing, the dancer roll swing angle detection means detects the tension fluctuation from the rotation angle of the dancer roll hinge axis.

In this case, in the present invention, since the tension presetting means is configured to perform presetting by moving the weight in the axial direction of the screw shaft, it is possible to bring the loss due to friction of each part of the presetting means close to zero. .

As a result, even if the tension fluctuation during printing is minute, it is accurately detected by the swing angle detection means of the dancer roll, and the detection result is fed back to the rotational drive source of the feed roll, allowing the feed roll of the printing material to The tension can be controlled by increasing/decelerating the dancer roll and keeping the dancer roll in a constant position.

Therefore, it is possible to eliminate printing misregistration even with a printing material that is easily stretchable and requires low tension control.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 3 show one embodiment of the present invention.
The figure is a system diagram showing the relationship between the printing material feeding device and the dancer roll device, FIG. 2 is a cross-sectional plan view of a part of the dancer roll device, and FIG. 3 is a vertical cross-sectional front view of FIG. 2.

The dancer roll device of the embodiment shown in these figures includes a weight guide plate 27, a screw shaft 29, and a weight attached to the screw shaft 29 via a nut 30, as shown in FIGS. 2 and 3. 3
1, a motor 33 which is a rotational drive source for the screw shaft 29, a position detection means for the weight 31, a digital display panel 39 which is a numerical display panel for tension, and a weight 3.
1 and a set of limit switches 41 and 42 provided on the fixed member.

As shown in FIGS. 2 and 3, the screw shaft 29 is arranged in a direction perpendicular to the dancer roll hinge axis 8, and is arranged in a direction perpendicular to the dancer roll hinge axis 8, and
is rotatably supported via bearings 28, 28'.

As shown in FIG. 3, the weight 31 is fixed to a nut 30 screwed onto the screw shaft 29, and by rotating the screw shaft 29 in the forward or reverse direction, the axis of the screw shaft 29 can be adjusted. It is designed to move in the direction.

This weight 31 has the 21st ii! As shown in I,
A trochanter 32 is provided so that the weight 31 can be smoothly moved along the inner surface of the weight guide plate 27 via the trochanter 32.

The motor 33, which is a rotational drive source for the screw shaft 29, is of a reversible type. As shown in the third @, this motor 33 rotates the screw shaft 29 in the forward or reverse direction through a driving timing pulley 34, a timing belt 35, and a driven timing pulley 36.

In the embodiment shown in FIGS. 1 to 3, the position detecting means for the weight 31 includes a dog 37 and a proximity switch 3.
8. Two dogs 37 are provided at one end of the screw shaft 29. The proximity switch 38 is disposed at a position corresponding to the dog 37, and is fixed in position to a bracket assembled to the bearing 28'. As the screw shaft 29 rotates, the position detection means for the weight 31 detects the rotation direction and rotation speed of the screw shaft 29 using the motor 33, the dog 37, and the proximity switch 38, and from this, the position of the weight 32 is detected. is calculated and output.

The digital tension display panel 39 is connected to a proximity switch 38 of the position detection means for the weight 31. This digital display panel 39 receives the detected position of the screw shaft 29 in the axial direction from the position detecting means of the weight 31, and calculates and displays the tension of the printing material 1 from this detected position.

The weight 31 is provided with a dog 40, and the weight guide plate 27 is provided with limit switches 41 and 42 at predetermined intervals. These dogs 40
and limit switches 41 and 42 are configured to stop the movement of the weight 31 at both ends of the screw shaft 29.

The other structures of the printing material feeding device and the dancer roll device are the same as those shown in FIGS. 4 to 6 above.

The dancer roll device of the above embodiment is controlled and operated as follows.

That is, when the printing material 1 is made of a material that is easily stretchable, data regarding the elongation of the printing material 1 is obtained experimentally in advance, and this data is transmitted to the control section (not shown) of the motor 33 that is the rotational drive source of the screw shaft 29. ) as the initial value.

Next, the control section drives the motor 33 to rotate the screw shaft 29 through the drive timing pulley 34, timing belt 35, and driven timing pulley 36, and the nut 3 screwed onto the screw shaft 29 is rotated.
0, the weight 31 is moved in the axial direction of the screw shaft 29 with the center of the dancer roll hinge shaft 8 as the reference point 0, a load is applied to the dancer roll 3, and the tension is preset.

When the screw shaft 29 rotates, the weight 3
The rotation speed and rotation direction of the screw shaft 29 are detected by the motor 33 and the dog 37 of the position detection means 1 and the proximity switch 38, and from this, the rotation speed and rotation direction of the screw shaft 29 are detected.
9, the position of the weight 31 in the axial direction is detected.

Next, on the digital display panel 39, a preset value of tension is calculated from the position of the weight 31 in the axial direction of the screw shaft 29 detected by the position detection means of the weight 31, and is digitally displayed.

Note that the relationship between the position of the weight 31 in the axial direction of the screw shaft 29 and the preset value of tension can be easily determined by experiment.

Therefore, the tension can be preset by remote control by controlling the motor 33 by the control unit, and it is also possible to accurately preset the tension while visually checking the digital display panel 39.

After the presetting of the tension is completed, if the tension fluctuates during paper splicing during printing or when the feeding device for the printing material 1 increases or decelerates, the dancer roll 3
swings around the dancer roll hinge shaft 8 as a fulcrum.

At this time, the angular displacement due to the swing of the dancer roll 3 is detected by the synchro transmitter 25, which is a swing angle detection means of the dancer roll 3.

Further, the detection result of the angular displacement of the dancer roll 3 by the synchro transmitter 25 is fed back to the DC motor 6 which is the rotational drive source of the feed roll 4, and the feed speed of the printing material 1 is adjusted, so that the dancer roll 3 is always The tension of the printing material 1 is controlled so as to keep it at a constant position.

When the dancer roll 3 moves, there is almost no friction and resistance loss only in the dancer roll hinge bearing part 9, so
It becomes possible to detect even minute tension fluctuations and respond accordingly. Therefore, even when the printing material 1 is easily stretchable and low tension control is required, this can be handled accurately, and misregistration of printing can be resolved.

In the embodiment shown in FIG. 1, the operation of the feeding device for the printing material 1 is the same as that shown in FIG. 4.

[Effects of the Invention] According to the invention described in claim 1 of the present invention described above, the presetting means for the tension applied to the printing material is provided by a screw shaft supported so as to be able to rotate once, and a screw shaft connected to the screw shaft via a nut. As a result, the tension can be accurately adjusted by remote control. In addition to having the effect of presetting, there is almost no loss due to friction and resistance even if the dancer roll is slightly displaced due to tension fluctuations during paper splicing during printing or when increasing or decelerating after presetting the tension. This makes it possible to detect the printing material, and therefore, it is possible to accurately cope with the case where the printing material is made of a material that is easily stretchable and low tension control is required, which has the effect of eliminating printing misregistration.

According to the second aspect of the present invention, a weight position detection means is connected to the screw shaft, and the position detection means calculates and displays a preset value of tension from the detected position of the weight. Since a display panel is connected, it is possible to preset the tension appropriately while looking at the numerical values.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a system diagram showing the relationship between the printing material feeding device and the dancer roll device, FIG. 2 is a cross-sectional plan view of a part of the dancer roll device, FIG. 3 is a longitudinal sectional front view of FIG. 2, and FIG. 4 5 is a system diagram showing the relationship between a printing material feeding device and a conventional dancer roll device, and FIG. 5 is a longitudinal sectional front view of the conventional dancer roll device.
FIG. 6 is a longitudinal side view as well. 1... Printing material, 3... Dancer roll, 4... Feed roll, 6... DC that is the rotational drive source of the feed roll
Motor, 7.7'...Frame, 8...Dancer roll hinge shaft, 1G, to'...Dancer roll support arm, 13°13'...Balance weight support arm, 14...Balance weight , 27... Weight guide plate, 29... Screw shaft, 30...
...Nut, 31...Weight, 33...Motor 237, which is a reversible rotation drive source for the screw shaft...
A dog, 38, constituting the weight position detection means.
...Proximity switch, 39...Digital display panel that is a numerical display panel for tension.

Claims (1)

[Scope of Claims] 1. A rotary printing press in which a dancer roll is provided swingably about a dancer roll hinge shaft, and a tension presetting means and a swing angle detecting means of the dancer roll are connected to the dancer roll hinge shaft. In the dancer roll device, the tension presetting means includes a rotatably supported screw shaft, a weight attached to the screw shaft in the axial direction of the screw shaft via a nut, and a rotational drive source that reversibly rotates the screw shaft. A dancer roll device for a rotary printing press, comprising: 2. A weight position detection means is connected to the screw shaft, and a numerical display panel is connected to the position detection means for calculating and displaying the tension of the printing material from the weight detection position. Item 1. A dancer roll device for a rotary printing press according to item 1.