JPH084292Y2 - Paper thickness adjusting device for sheet-fed printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper thickness adjusting device for a sheet-fed printing press.

[Conventional technology and its problems]

Generally, a sheet-fed printing press has a plate cylinder 50 as shown in FIG.
A metal plate is bent and attached to the circumference of the plate cylinder 50 and the impression cylinder.
A blanket cylinder 51 is interposed between the blanket cylinder 52 and the blanket cylinder 52, and the plate pattern of the metal plate is once transferred to the surface of the blanket cylinder 51, and this is printed on the printing paper 53 wound around the impression cylinder 52. . The printing pressure between the blanket cylinder 51 and the impression cylinder 52 is adjusted according to the thickness of the printing paper 53 used.

Therefore, in such a sheet-fed printing press, since the printing paper 53 is not continuous paper, the impression cylinder 52 is equipped with a clamp device 63 for clamping the printing paper 53, and the clamping device 63 is the impression cylinder 52. It is housed in a concave groove 64 provided along the axial direction of.

Therefore, in order to apply the printing pressure to the printing paper 53, since the impression cylinder 52 has the concave groove 64, it is necessary to always keep the distance between the impression cylinder 52 and the blanket cylinder 51 constant. If the structure is such that the blanket cylinder 51 is pressed against the impression cylinder 52 with a fluid cylinder (pneumatic pressure, hydraulic pressure, etc.), when the groove 64 moves to the contact portion of the blanket cylinder 51, the blanket cylinder 51
The peripheral portion of 51 is fitted into the groove 64, and the blanket cylinder 51 is damaged.

Therefore, conventionally, regarding the setting of the printing pressure,
Proposals as shown in FIGS. 6 and 6 have been made. That is, according to Japanese Utility Model Laid-Open No. 63-101530, the impression cylinder 52 is adjusted by adjusting the rotation of the eccentric bearings 54 provided at both ends of the blanket cylinder 51.
In the paper thickness adjusting device of the sheet-fed printing press, which adjusts the dimension between the blanket cylinder 51 and the blanket cylinder 51 according to the thickness of the printing paper 53, one rotary drive shaft 55 for rotating these eccentric bearings 54. Is provided parallel to the axis of the blanket cylinder 51, and 1 is attached to the end of the rotary drive shaft 55.
An apparatus has been proposed in which a single manual handle 56 is detachably mounted and the rotary drive shaft 55 is connected to a single motor 59 via a rotation transmission mechanism 57 and a clutch 58.

However, in such a sheet thickness adjusting device for a sheet-fed printing press, since the fan-shaped gears 60 for rotating the eccentric bearings 54 provided on both sides are connected by the single rotation drive shaft 55,
If the impression cylinder 52 and the blanket cylinder 51 are not set parallel to each other, remove each fan-shaped gear 60 from the rotary drive shaft 55 and readjust the parallelism between the impression cylinder 52 and the blanket cylinder 51. This had to be done, and this adjustment required a great deal of time and ability. Moreover, there is a possibility that a twist error of the rotary drive shaft 55 may occur.

In addition, in such a sheet thickness adjusting device of the sheet-fed printing press,
In order to detect the dimension between the 51 and the impression cylinder 52, the rotation angle of the eccentric bearing 54 is detected by the potentiometer 61. However, due to the backlash of the gear 62 connecting the potentiometer 61 and the eccentric bearing 54 and the manufacturing error of the blanket cylinder 51, the impression cylinder 52, etc., the dimension between the cylinders cannot be accurately grasped.

[Means for solving the problem]

Therefore, the present invention has been devised to solve such a problem, and the gist of the present invention is that a blanket cylinder is interposed between the plate cylinder and the impression cylinder, and both ends of the blanket cylinder are eccentric bearings. And the eccentric bearing is rotated according to the thickness of the printing paper to adjust the size between the blanket cylinder and the impression cylinder. A motor for rotating the eccentric bearing is connected to each of the bearings via a separate rotation transmission mechanism, and in order to detect the displacement amount of the blanket cylinder, it is possible to accurately measure the axial ends of the blanket cylinder. A paper thickness adjustment for a sheet-fed printing press, characterized in that a position detector facing the polished bearer surface is provided, and the motors can be separately controlled by a paper thickness and / or a signal from the position detector. On the device.

[Embodiment] The configuration of the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 is a horizontal sectional view of a first embodiment of the present invention, FIG. 2 is a perspective view of an essential portion of FIG. 1, FIG. 3 is a horizontal sectional view of the second embodiment, and FIG. FIG. 3 is a horizontal sectional view of an essential part of the embodiment.

Each of the embodiments of the present invention is suitable for a sheet-fed printing press, and the first embodiment will be described with reference to FIGS.
In the figure, reference numeral 1 is a blanket cylinder, and its body shafts 1a, 1a are supported by machine frames 3, 3 on both left and right sides via eccentric bearings 2, 2, respectively (hereinafter, only one side will be described for left-right symmetry). ).

That is, the eccentric bearing 2 includes a bearing 4 and an eccentric housing 5 in which the bearing 4 is fitted, and the eccentric housing 5 is rotatably fitted to the machine frame 3.

A pin 6 is projectingly provided inside the eccentric housing 5,
One end of a screw shaft 7 is pivotally attached to and connected to the pin 6. Therefore, by moving the screw shaft 7 back and forth, the eccentric housing 5 is rotated, and the shaft center of the body shaft 1a is moved.

The other end of the screw shaft 7 is screwed into a screw cylinder 8, and the base end of the screw cylinder 8 is rotatably supported by the machine frame 3 via a support block 9 described later. That is, the base end of the screw cylinder 8 penetrates the support block 9 and is rotatably supported. The support block 9 is rotatably fitted in the machine frame 3. Therefore, the screw cylinder 8 is swingably connected to the machine frame 3 and rotatably connected to the support block 9.

A worm wheel 10 is fixed to the body of the screw cylinder 8. The worm wheel 10 meshes with a worm (not shown), and one end of a worm shaft 11 of the worm is connected via an electromagnetic clutch 12 to a motor 13 capable of forward and reverse rotation. The motor 13 can be remotely operated together with the electromagnetic clutch 12.

Then, the screw shaft 7, the screw cylinder 8, and the worm wheel
A rotation transmission mechanism 23 is constituted by 10, the worm, the worm shaft 11, the electromagnetic clutch 12, and the like.

A gear 14 is provided in the middle of the worm shaft 11, and a gear 15 that meshes with the gear 14 is provided on the shaft 16a of the rotary knob 16. These members 12, 14, 15 are provided inside the housing 17. Reference numeral 18 denotes a large gear that drives the blanket cylinder 1.

As shown in FIG. 2, a displacement sensor 19 is exposed to bearer surfaces 22 (which are highly accurately polished) provided on both ends of the blanket cylinder 1 in the axial direction. A detection signal from the displacement sensor 19 is converted into an analog amount by a central processing unit (not shown), the analog amount is displayed on a display (not shown), and a control device (not shown) for controlling the motor 13 is displayed. ) Is to be entered. In this control device, the detected signal is compared with the preset paper thickness data for calculation, and the motor 13
It is designed to reverse.

The operation of this embodiment will be described. To adjust the dimension between the impression cylinder (not shown) and the blanket cylinder 1, first, set the paper thickness data and set the paper thickness data and the displacement sensor set by the control device.
The detection signals from 19 are compared and calculated, the electromagnetic clutches 12 on both sides of the body shafts 1a, 1a are turned on, and the motors 13 are started in the direction in which the blanket cylinder 1 is to be rotated. The rotation of each motor 13 is transmitted to the worm shaft 11 → the worm → the worm wheel 10 → the screw cylinder 8 to move the screw shaft 7 back and forth. As a result, since each eccentric housing 5 rotates, for example, 8.9 degrees, the axial center position of the blanket cylinder 1 changes, and in the control device for controlling the motor 13, the paper thickness data and displacement sensor set as described above are set.
Since the rotation of each motor 13 is controlled while comparing and calculating the detection signal from 19, it is possible to obtain a predetermined body-to-body dimension.
Therefore, the operation side and drive side body shafts 1a, 1 of the blanket cylinder 1
a can be adjusted at the same time, and the impression cylinder and the blanket cylinder 1
Even when and are not set parallel to each other, the blanket cylinder 1 can be corrected to be parallel to the impression cylinder by adjusting the rotation of the motor 13 on one side.

Further, the adjustment amount is directly detected by the displacement sensor 19 facing the bearer surface 22 of the blanket cylinder 1, the detected amount is converted into an analog amount, and the motor 13 is controlled by comparing with the input of the paper thickness. Therefore, even if there is a backlash of the screw shaft 7 or the screw cylinder 8 or an error due to a mechanical clearance, the parallelism of the blanket cylinder 1 is not impaired.

Moreover, since the worm and the worm wheel 10 are used to rotate the screw cylinder 8, this serves as a locking mechanism for the screw cylinder 8 and it is not necessary to further fix the screw cylinder 8 (by a conventional rotary knob, a conventional one). The screw cylinder to be rotated needs a rotation stop member, and after adjusting the dimension between the bodies, the rotation stop member was always operated and locked, but the operation is not required).

Next, in the first embodiment, when the rotary knob 16 is manually operated as in the conventional general operation (for example, when the motor 13 fails), the electromagnetic clutch 12 is OF.
If it is set to F and the rotary knob 16 is rotated, the dimension between the bodies can be adjusted. The adjustment amount at this time can be visually checked on the display. Of course, a normal dial type indicator may be used together.

Next, a second embodiment of the present invention will be described. In FIG. 3, the difference from the first embodiment is that one end of the worm shaft 11 is extended and a rotary knob 16 is attached to the end of the worm shaft 11 to attach the gears 14 and 15 and the shaft 16a of the first embodiment. Omit it,
The whole is simplified.

Next, a third embodiment of the present invention will be described. In FIG. 4, bevel gears 20 and 21 are used instead of the worm and worm wheel 10 of the first embodiment.

In each of the above embodiments, the eccentric housing is rotated by being screwed into the screw shaft and the screw cylinder, but the present invention is not limited to this, and the eccentric housing may be rotated by the gear train mechanism. .

[Effect of device]

According to the present invention, the eccentric bearings that support both ends of the blanket cylinder are rotated by separate motors through the rotation transmission mechanism so that the dimension between the blanket cylinder and the impression cylinder can be adjusted. Even when the blanket cylinder is not set in parallel, or when there is a mechanical clearance between the eccentric bearing and the motor, it is of course possible to adjust these inconveniences at the same time. Since the displacement of the blanket cylinder is detected by the position detectors that face the bearer surfaces, which are polished at high accuracy at both ends in the axial direction, and the motor is controlled by the detection signal, the parallelism and cylinder The interspace size (printing pressure) is detected and adjusted, and the adjustment can be performed with extremely high accuracy.

Especially, the displacement detection by the position detector facing the bearer surface, which is polished with high precision, and the motor rotating by the rotation transmission mechanism, are matched and corresponded well, and the parallelism and the inter-body dimension Since there is no room for unstable elements such as noise to be entered, the adjustment can be made extremely accurate.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a first embodiment of the present invention, FIG. 2 is a perspective view of an essential portion of FIG. 1, FIG. 3 is a horizontal sectional view of the second embodiment, and FIG. FIG. 5 is a horizontal sectional view of an essential part of the embodiment, FIG. 5 is a side view of a printing pressure setting device of a conventional sheet-fed printing press, and FIG. 6 is a plan view of FIG. 1 …… Blank barrel, 2 …… Eccentric bearing, 13 …… Motor, 19 ……
Displacement sensor, 22 …… bearer surface, 23 …… rotation transmission mechanism.

Claims (1)

[Scope of utility model registration request] 1. A blanket cylinder is interposed between a plate cylinder and an impression cylinder, both ends of the blanket cylinder are supported by eccentric bearings, and the eccentric bearings are rotated according to the thickness of printing paper. In a paper thickness adjusting device of a sheet-fed printing press that adjusts a dimension between a blanket cylinder and an impression cylinder, a motor for rotating the eccentric bearings is provided to each of these eccentric bearings via a separate rotation transmission mechanism. In order to detect the amount of displacement of the blanket cylinder while being connected, position detectors are provided which face the highly precisely polished bearer surfaces at both axial ends of the blanket cylinder, respectively, and the paper thickness and / or position A paper thickness adjusting device for a sheet-fed printing press, wherein the motors can be separately controlled by a signal from a detector.