JPS6213800Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a swinging roller with a torque limiter for a dampener in an offset printing machine. The torque limiter attached to the transmission gear between the parts cuts off the power transmission between the transmission gear and the support shaft, and prevents the transmission gear and support shaft, etc. The goal is to prevent the spread of failures.

For example, a Dahlgren type dampener in an offset printing machine forms a thin water film on the ink surface of the ink form roller by supplying dampening water from the water source roller through the chrome roller to the ink form roller. (The Dahlgren method works by keeping the balance between ink and water.) It is possible to ensure good quality printing.

This kind of thin water film is transferred onto the surface of the chrome roller by being regulated by the nip pressure with the water source roller, but it is uniformly 5μ to 15μ over the entire surface of the chrome roller. It is very difficult to form a thin water film, and such a thin water film causes partial thick and thin water unevenness in the width direction of the chrome roller due to various reasons. As a result, there is a difference in the amount of ink adhering to the plate surface, and streak-like printing unevenness appears on the printing surface as a whole.

In order to eliminate the partial unevenness of the water film on the chrome roller surface, which is one of the causes of streak-like printing unevenness that occurs on the printing surface, as one means,
The chrome roller is swung in its axial direction.

As a chrome roller swinging mechanism, the present inventor has previously proposed a chrome roller swinging device in a Dahlgren type dampening water supply device. (Japanese Patent Application No. 55-163702 (Japanese Unexamined Patent Publication No. 57-87365)) This product was designed and manufactured as a unit to be used as a replacement for the dampener part of a conventional offset printing machine. A swinging mechanism is provided within the main body, making the overall structure compact.

That is, as a swinging mechanism for the chrome roller, the roller main body of the chrome roller and the support shaft that supports it are configured to rotate separately from both sides of the water base roller in contact with the chrome roller by gear transmission, and this support A cam follower provided on the roller body side is engaged with a grooved cam provided on the shaft, and the roller body is configured to swing due to the difference in rotation between the roller body and its supporting shaft. In the moving mechanism, if the cam follower is worn out, other parts are damaged, and the cam follower does not slide in the cam groove, the roller body and its spindle will rotate as one unit. As a result, abnormal rotational force is applied to the gear on the spindle side, which is different from the rotation of the roller body, resulting in failures such as breaking the gear or twisting the spindle. become.

The present invention is designed to reduce the power transmission to the spindle side in order to prevent the failure from spreading when trouble occurs in the axial swing mechanism of the swinging chrome roller in the damper of an offset printing machine. A torque limiter is attached to the gear.

In other words, the torque limiter is equipped with a cam plate that is limited from the spindle side and a cam plate that is limited from the gear side, on the gear part on the spindle side of the chrome roller. A pressing arm that locks onto the metal is provided from the gear side, and the locking of the pressing arm transmits rotation from the gear side to the support shaft, allowing the roller body to swing on the support shaft. If a problem occurs with the swinging mechanism, the pressing arm will become unlatched to both cam plates and the fixed metal of the support shaft, and the transmission of rotation between the gear side and the support shaft will be cut off. It is something that exists.

Hereinafter, drawings of examples will be described.

As shown in Fig. 1, the dampener is designed so that ink kneaded by a rocking roller b is applied to the plate surface a' of a plate cylinder a by ink forming rollers c and c'. An oscillating chrome roller A is in contact with this ink form roller C, and a water base roller B, which is partially immersed in dampening water e from Mizifune d, is in contact with this chrome roller A. The water film is supplied from the water base roller B via the chrome roller A onto the surface of the inking roller C.

As shown in FIG. 2, the swinging roller A consists of a roller body f and a support shaft g that supports it. It is rotatably supported on a support shaft g, and both ends of the support shaft g are supported by bearings 2, 2' in the machine frame n.

The gear 3 on the left side of the support shaft g is connected to the gear 4 on the left side of the water head roller B, and the right bearing part 1' of the roller body f.
The gears 5 fixed to are meshed with the right gears 6 of the water head roller B, respectively.

A torque limiter portion h, which is a feature of the present invention, is attached to the left gear 3 of the spindle g of the roller body f of the oscillating chrome roller A.
Further, on the right support shaft g, a swinging mechanism section i for swinging the roller main body f is provided between it and the roller main body f.

As shown in FIGS. 3 to 5, the torque limiter part h has a T-shaped metal 8 fixed to the thin shaft part 7 of the support shaft g, and the gear 3 is attached to the small diameter part 9 of this T-shaped metal 8. It is fitted through the bushing 10. Between this gear 3 and the large diameter portion 11 of the T-shaped metal 8, there is an inner cam plate 13 having the same diameter as the large diameter portion 11;
An outer cam plate 12 is fitted, and a retaining ring 14 is fitted on the outside of the gear 3.

The large diameter portion 11 of the T-shaped metal 8 has small, medium, and large arc-shaped recesses 15, 16, at three locations at 90-degree intervals.
17, and a large diameter portion 1 is provided at the boundary between the large diameter portion 11 and the small diameter portion 9 at a position symmetrical to the hollow notch 16.
A screw 18 slightly longer than the thickness of 1 is inserted.

The inner cam plate 13 has T-shaped metal 8 small, medium,
Recesses 15', 16', and 17' of the same size as the large recess 17 are provided at the same positions as the large recesses 15, 16, and 17, and the positions are symmetrical to the recess 16'. An arc-shaped recess 19 is provided within the center angle of 60 degrees. In addition, the outer cam plate 1
2, a concave notch 16'' of the same size as the large concave notch 17 is provided at the position of the medium concave notch 16 of the T-shaped metal 8, and outside the symmetrical position of this concave notch 16'',
An arcuate recess 20 is provided within a center angle of 60 degrees.

The gear 3 includes a T-shaped metal 8 and an inner cam plate 1.
3. Recesses 16 and 1 of the outer cam plate 12
A pressing arm 22 having a protrusion 21 that fits into 6', 16'' is pivotally attached to a pivot 23, and the other end of this pressing arm 22 is connected to an adjusting rod 24 by a pivot 25. The adjusting rod 24 passes through a holding member 26 rotatably fixed to the gear 3, and a spring is inserted between the holding member 26 and an adjusting nut 27 screwed onto the end of the adjusting rod 24. 28 are provided.

Furthermore, a screw 29 that is slightly longer than the thickness of the gear 3 is screwed into the gear 3 at a position symmetrical to the protrusion 21 of the pressing arm 22.

When the torque limiter part h made up of the above-mentioned structural members is in the state shown in FIGS. 3 and 4 when rotation is transmitted in a normal state, the protrusion 21 of the pressing arm 22 is in a T-shape. Recesses 1 in each of the metal 8, inner cam plate 13, and outer cam plate 12
6 and 16', 16'', and the protrusion 21 and the screws 18, 29 are in a straight line, and the screw 18 is inserted into the recess 19 of the inner cam plate 13, and the screw 29
protrude into the recesses 20 of the outer cam plate 12, respectively.

Next, as shown in FIG. 2, the swinging mechanism part i is
It consists of a cam member 31 having a cam groove 30 fixed to a support shaft g, and a cam follower 33 supported by a protruding arm 32 from a bearing portion 1' of a roller body f.

The gear ratio of gears 4 and 3 on the left side that transmits rotation from the water base roller B to the support shaft g is smaller than the gear ratio of gears 6 and 5 on the right side that transmits rotation from the water base roller B to the roller body f. .

Next, the effect will be explained.

If the torque limiter h attached to the gear 3 that transmits rotation to the support shaft 3 of the roller body f of the swinging chrome roller A is normal, as shown in FIGS. The protrusion 21 is fitted into the recesses 16, 16', 16'' of the T-shaped metal 8, the inner cam plate 13, and the outer cam plate 12 by the elastic force of the spring 28 wound around the adjustment rod 24. The screws 18 and 29 protrude from the center of the recesses 19 and 20, respectively. is rotated from gear 6 through gear 5 in the same direction as support shaft g.Since the gear ratio between gears 5 and 6 is larger than that between gears 3 and 4, the rotation of roller body f is faster. The rotation is larger than the rotation of the support shaft g, and due to the rotation difference, the roller body f swings in the axial direction on the support shaft g at the swing mechanism part i consisting of the cam member 31 and the cam follower 33.
Due to the swinging of this roller body f, that is, the chrome roller A, the dampening water from the water source roller B is coated with a thin film of dampening water.
This prevents uneven thickness in the width direction from occurring. During such normal operation, if an abnormality occurs in the cam follower 33 or other parts of the swing mechanism section i, the swing mechanism section i will lose its function.
The roller body f no longer swings on the support shaft g, and therefore, unless measures are taken to avoid the generation of abnormal rotational force between the gear 3 and the support shaft g, the gear 3 may be damaged or the support shaft may be damaged. Failures such as twisting of the shaft g may occur.

In the present invention, in order to prevent damage in such a case, a torque limiter part h is attached to the gear 3, so that in the above-mentioned unexpected situation, the rotation of the gear 3 is directly transmitted to the support shaft g. If not, and a rotation difference is generated between the two, a relative movement will occur between the support shaft 7, that is, the T-shaped metal 8, and the gear 3, and the pressing arm 22 will move as shown by the imaginary line in FIG.
The protrusion 21 escapes from the recess 16 against the spring 22 and rides on the outer peripheral surface of the large diameter portion 11 of the T-shaped metal 8, as shown in FIG. At this time, the screw 18 screwed into the T-shaped metal 8 is locked into one end of the recess 19 of the inner cam plate 13, and the screw 29 screwed into the gear 3 is inserted into the recess of the outer cam plate 12. The other end of the notch 20 opposite to the screw 18 is locked, and the gear 3
The rotational relationship between the gear 3 and the support shaft g is free, and there is no problem in the rotation difference between the gear 3 and the support shaft g due to loss of function of the swing mechanism part i, and they are mutually stable. It will continue to rotate.

In this rotation, the notches 16, 16', 16'' of the T-shaped metal 8, the inner cam plate 13, and the outer cam plate 12 are not lined up, and the protrusion 21 of the upper pressing arm 22 is as shown in FIG. As shown in FIG.
6'', and the protrusion 21 on the gear 3 side slides on the large diameter part 11 of the T-shaped metal 8 on the support shaft g side and the outer peripheral surface of the inner cam plate 13, and connects the gear 3 with the support. Each continues to rotate independently with respect to the axis g.

In order to return the torque limiter h to its normal position after repairing the faulty parts inside the swinging mechanism part i and other parts of the roller body f, loosen the tension on the spring 28 with the adjustment nut 27 to eliminate the pressure on the arm 22. , rotate the T-shaped metal 8, the outer cam plate 13, and the inner cam plate 12 to form the respective recesses 16, 16', 1.
6'', and attach the protrusion 2 of the pressing arm 22 to this.
1 and then tightening the adjustment nut 27 again. These recesses 16,1
The state of engagement between the projections 21 and the T-shaped metal 8
They also differ depending on whether they are fitted into recesses 15 or 17 having different depths.

As described above, the present invention provides a swinging roller for a dampener in an offset printing machine, in which a gear on a spindle that supports the roller body is provided with a cam plate that limits the spindle on the spindle side, and a cam plate that limits the gear on the gear side. At the same time, we added a torque limiter section that locks the cam plate and the fixed metal of the support shaft with a pressing arm from the gear side, so that the swing mechanism section installed inside the roll body Even if an abnormality occurs in the cam follower or other parts, the function of the swinging mechanism will stop, the locking state between the gear and the support shaft will be cut off, and the gears will be able to rotate together. It is possible to prevent failures from spreading to damage to mechanical parts, twisting of support shafts, etc.

This means that even if the rocking motion of the roll body stops, it continues to rotate, so work can be continued without causing fatal damage to the printed matter, and subsequent repairs can be kept to a minimum or urgent. No major repairs may be required.

Moreover, in such a configuration, attaching the torque limiter to the gear, in conjunction with arranging the swinging mechanism of the roll body within the roll body, makes the dampener as a unit more compact.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a dampener, FIG. 2 is a cross-sectional view showing the relationship between the chrome roller and water head roller of the dampener of the present invention, and FIG. 3 is a cross-sectional view of the torque limiter portion of the chrome roller in the dampener of the present invention. Figure 4 is a cross-sectional view taken along line X-X as above, Figure 5 is a front view of the T-shaped metal, b is the inner cam plate, c is the outer cam plate, and d is the position of the above three parts shifted from each other. FIG. A...Swinging chrome roller, B...Mizumoto roller,
a... Plate cylinder, b... Rocking roller, c, c'... Ink forming roller, d... Water boat, e... Dampening water, f...
... Roller body, g ... Support shaft, h ... Torque limiter section, i ... Rocking mechanism section, 3, 4, 5, 6 ... Gear, 8 ... T-shaped metal, 12 ... Outer cam plate, 1
3... Inner cam plate, 16, 16, 16... Notch,
21...Protrusion, 22...Press arm, 31...Cam member, 33...Cam follower.

Claims (1)

[Scope of utility model registration request] A dampener in which the roller body of the swinging roller and its spindle are rotated separately from both sides by a water head roller, and the roller body swings on the spindle due to the difference in rotation, The gear on the spindle side of the swing roller is provided with a cam plate that is restricted on the spindle side and a cam plate that is limited on the gear side, and these cam plates and the fixed metal of the spindle are connected together. A pressing arm is provided on the gear side, and by locking this pressing arm, power is transmitted from the gear side to the support shaft side. However, when the swing mechanism stops, both of the above cam plates, the fixed metal and the pressing A swinging roller with a torque limiter configured so that it can be disengaged from the arm.