JPH052640Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pressurized release device for a calender for finishing paper made by a paper machine or coated with a coater by imparting gloss and smoothness. It is something.

[Prior Art] There is a conventionally used calendar shown in Fig. 5, in which an axle box b is fixed to the upper part of a pair of stands a that are set up at a required interval on the operation side and the drive side. A fixed metal roll c is rotatably supported on each shaft box b. Support levers d and e are pivotally supported by pins f and g at required intervals on each stand a below the fixed part of each axle box b, and intermediate elastic rolls h, Each of the lower metal rolls i is pivotally supported, and each of the rolls c, h, and i is pressurized and released by a lower pressure cylinder j. In the figure, k is a stopper.

In the calendering process, the work is carried out continuously, so the paper splicing must be done at regular intervals, but the paper splicing part is
If the intermediate elastic roll h is nipped by the paper, the surface of the intermediate elastic roll h is likely to be damaged, and the paper is likely to break.

Therefore, conventionally, the pressing force from the pressure cylinder j is released before and after the paper splicing part, and each of the rolls h and i
and lower each gap of rolls c, h, and i.
G ₁ and G ₂ are left open.

[Problems to be solved by the invention] However, in the conventional calender, when the piston rod of the pressure cylinder j is retracted, the support lever e tilts downward and the lower metal roll i descends as shown in FIG. Because the intermediate elastic roll h also descends due to its own weight with the lower metal riding on the roll i, even if the gap _G1 between the fixed metal roll c and the intermediate elastic roll h opens, the intermediate elastic roll h and the lower metal Since the paper web is caught in the gap _G2 between the roll i and the roll i, the tension is unbalanced and paper breaks occur.

Furthermore, although the circuit design is such that the left and right hydraulic cylinders j operate synchronously, they do not necessarily operate synchronously, and either end of each roll h or i will descend earlier or later. As shown in FIG. 7, even if one end of the roll gaps G ₁ and G ₂ is opened, the other end remains closed and the paper web is caught between them, resulting in an unbalanced tension.

Furthermore, conventionally, leaf springs l and m are used to bias the rolls c, h, and i in the direction of expanding the gaps G ₁ and G ₂ , but the elastic force of the lower leaf spring m is Unless the elastic force is made stronger than the elastic force of the upper leaf spring l, the gap _G2 will remain closed even if the gap _G1 opens, and it is very difficult to adjust the elastic force of these leaf springs l and m.

Therefore, in the past, the surface of the intermediate elastic roll h was easily scratched and paper was easily broken, so the line had to be stopped for a long time to replace the roll or feed paper, resulting in a low operating rate.

Furthermore, a high-precision hydraulic cylinder using a control valve etc. allows the slow gear gap G ₁ ,
If _G2 is opened, the weak range of the nip becomes longer, the amount of paper waste increases, and the yield decreases.

[Means for Solving the Problems] The present invention solves the above-mentioned conventional problems, opens the upper and lower gaps simultaneously and quickly, prevents damage to the elastic rolls and paper cuts, and improves the operating rate and yield of the line. The roll shaft box at the top of the calender, which has at least one elastic roll, is fixed to a frame.
An axle box that pivotally supports other rolls is fixed to a movable frame attached to the frame, and at least the uppermost left and right movable frame is connected to a torque shaft so that the torque shaft can rotate, and a cam is attached to the torque shaft. A pressure release device for a calendar, which is fixed at a midway portion of the cam, is provided with at least one stopper on the rotation locus of the cam, and is further provided with a drive source for rotation of the cam. .

[Operation] When the cam is rotated by the rotation drive source, the cam is rotated synchronously by the torque shaft, pushes the stopper, or receives a reaction force from the stopper, and the roll gear opens and closes simultaneously and evenly and in a short time. do.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show an embodiment of the present invention, in which 1 is a stand, 2 is a fixed shaft box, 3 is a fixed metal roll, 4 and 5 are support levers, 6 and 7 are pins,
8 is an intermediate elastic roll, 9 is a lower metal roll, 10 is a pressure cylinder, G ₁ and G ₂ are gaps, and the structure is substantially the same as that of the conventional example.

Both ends of a torque shaft 11 are rotatably attached to the intermediate portions of the support levers 4 on the operation side and drive side, respectively, and cams 1 are attached to both ends of the torque shaft 11.
2 are fitted and fixed at the center so that the left and right phases are the same. The length of the cam 12 is longer than the diameter of the intermediate elastic roll 8, and pins 15 and 15 are provided at both ends of the cam 12 so that the rollers 13 and 14 can be rotated.
16, and the tip of the piston rod 19 of a hydraulic or pneumatic hydraulic cylinder 18 pivotally connected to each of the support levers 4 by a pin 17 is connected to the fixing point of the torque shaft 11 of the cam 12 and the mounting point of the roller 14. They are connected by pins 20 between them.

A stopper 21 is attached to the upper side surface of each of the stands 1 and outside the rotation locus of the tip of the cam 12 so that the protruding length can be changed, and a stopper 21 is attached to the middle part of each of the support levers 5 and is connected to the stopper 21. A stopper 22 is attached to a position where an extension of the straight line connecting the fixing point of the torque shaft 11 intersects with the rotation locus so that its protrusion length can be changed. In the figure, 23,2
4 indicates an axle box.

With the above structure, when the paper splicing part is reached during operation, when the pressing force of the pressure cylinder 10 is released and the piston rod 19 of the fluid pressure cylinder 18 is simultaneously pushed out, the cam 12 will move as shown in FIG. The upper and lower rollers 13 and 14, which rotate clockwise and are in a non-contact state, and the upper and lower stoppers 21 and 2
2 are in contact with each other, the support lever 4 is tilted downward by the reaction force of the stopper 21, and at the same time the support lever 5 is tilted up and down by the reaction force of the torque shaft 11, so that the gears G ₁ and G ₂ are simultaneously and the same. formed at intervals.

Further, the left and right cams 12 are fixed to the torque shaft 11 in the same phase, and since the torque shaft 11 is strong against torsion, the rotational force transmitted to the cam 12 at one end is transferred to the cam at the other end. 1
2', the left and right rotational forces are completely synchronized, and the gap G ₁ and G ₂ are simultaneously formed at the same interval in the left and right direction.

Therefore, the gaps G ₁ and G ₂ are simultaneously opened on the upper and lower sides and on the left and right sides in a short time.

Immediately after passing through the paper splicing section, the cam 12 is rotated clockwise by an operation opposite to that described above, and pressing force is applied by the pressure cylinder 10. As a result, the gap G ₁ ,
G ₂ closes top, bottom, left and right at the same time.

In the above operation, the release or application of the pressurizing force of the pressurizing cylinder 10 and the protruding or retracting of the piston rod 19 of the fluid pressure cylinder 18 may be operated with a time difference.

Furthermore, the intermediate elastic roll 8 or other rolls 2, 9
upper and lower stoppers 21, 2 according to the roll diameter of
By adjusting the amount of protrusion of rolls 2, upper and lower
The left and right gears G ₁ and G ₂ can be opened or closed simultaneously.

FIGS. 3 and 4 show another embodiment of the present invention, in which the structure is substantially the same as that of the previous embodiment, but instead of the support levers 4 and 5, support frames 27 and 28 having a U-shaped cross section are provided. This is an example in which the device is attached to the stand 1 so as to be able to slide in the vertical direction of the stand 1 using the strips 25 and the sliding grooves 26.

In this embodiment, as in the previous embodiment, by rotating the cam 12 and the torque shaft 11 by protruding or retracting the piston rod 19 of the fluid pressure cylinder 18, the support lever 27 and the rolls 8 and 9 are rotated. 28 can be moved up and down, and the gaps G ₁ and G ₂ can be simultaneously opened or pressurized vertically and horizontally.

Note that the device of the present invention is not limited to the above-mentioned embodiments, and can be applied as long as the number of rolls is two or more, and the elastic rolls and metal rolls may be arranged alternately. It goes without saying that various changes can be made without departing from the gist of the invention, such as the fact that the rotational drive source for the cam may be not only a fluid pressure cylinder but also a screw rod, etc. [Effects of the invention] As described above, according to the pressurizing release device for a calendar of the present invention, the left and right movable frames are connected by a torque shaft so that the torque shaft can rotate, and the cam fixed to the torque shaft is rotated. Since the distance between the stopper and the torque shaft is widened at equal intervals on the left and right sides, the roll gap can open and close at equal intervals in the upper and lower stages and in the left and right directions at the same time and in a short time, and the paper splicing part can be cut. It can be passed through the paper in a short time without any problems, and various excellent effects can be achieved, such as significantly improving the operating rate and significantly reducing the amount of paper waste.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the device of the present invention, FIG. 2 is a view taken in the − direction of FIG. 1, FIG. 3 is an explanatory diagram of another embodiment of the device of the present invention, and FIG. 4 is a view in the − direction arrow of FIG. 3, FIG. 5 is an explanatory diagram of the conventional example,
6 is a diagram showing the conventional gap shown in FIG. 5 in an incompletely opened state, and FIG. 7 is a diagram showing the conventional gap shown in FIG. 5 in an incompletely opened state. Figure 1 shows the stand, 3 shows the fixed metal roll, 4,
5 is a support lever, 8 is an intermediate elastic roll, 9 is a lower metal roll, 11 is a torque shaft, 12, 12'
18 is a fluid pressure cylinder, 21 and 22 are stoppers, and 27 and 28 are support frames.

Claims (1)

[Scope of utility model registration request] The uppermost roll axle box of a calendar having at least one elastic roll is fixed to a frame, the axle boxes for pivotally supporting other rolls are fixed to a movable frame attached to the frame, and at least the uppermost left and right movable frame is fixed to a frame. A cam is connected to the torque shaft so that the torque shaft can rotate, a cam is fixed to the torque shaft in the middle of the cam, and at least one stopper is provided on the rotation locus of the cam. A pressure release device for a calendar, characterized in that it is equipped with a dynamic drive source.