JPH0434030Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a forced roller paper ejection mechanism for a printing press in which a paper ejection roller shaft and a paper ejection roller are connected by a compression spring.

(Prior Art) FIGS. 4 to 7 are assembly diagrams showing a conventional example of a forced roller paper ejection mechanism for a printing press.

The rotational force of gear 2, which is driven by a gear (not shown) of the impression cylinder IC, is generated by gear 3,
The signal is transmitted to the gear 4, which rotates the paper discharge roller shaft 1 in the direction of the arrow shown in FIG. As shown in FIG. 6, the paper discharge roller shaft 1 is machined with a groove 1a in the longitudinal direction. As shown in FIG. 7, a pin 5 inserted into a pin hole of a paper discharge roller 7 is engaged with this groove 1a, and this pin 5 is pressed and fixed in the groove 1a by a ring-shaped leaf spring 6. ing. Therefore, the paper discharge roller 7 rotates in the direction of the arrow in FIG.

This paper ejection roller 7 is supported by a lever 9 held by a support shaft 8, and the biasing force of a spring 10 acts on the lever 9, so that it is rotated while being pressed against the impression cylinder IC. . The diameter of the paper ejection roller 7 is larger than the diameter of the pitch circle of the gear 4 pin-fixed to one end of the paper ejection roller shaft 1.
Since the circumferential speed of is faster than the circumferential speed of the impression cylinder IC, immediately after passing the contact point between the paper discharge roller 7 and the impression cylinder IC,
The printing paper released from the gripper of the impression cylinder IC is fed between the rollers 11 and 12 while being pulled and pushed out by the paper discharge rollers 7. In this way, the peripheral speed of the paper discharge roller 7 is
faster than the peripheral speed of the impression cylinder IC,
Because the paper is forcibly ejected, it is called forced roller ejection.

The roller 11 is provided with an impression cylinder.
The rotation of the gear of the IC is transmitted through gear 2 and gear 13, and rotates in the direction shown by the arrow in Fig. 4. The roller 12 rotates by pressing against the roller 11 due to its own weight. The roller 11 also rotates by pressing against the gear 1.
3 and is faster than the peripheral speed of the impression cylinder IC and the peripheral speed of the paper discharge roller 7.

The portion shown in FIG. 6 can be easily taken out from the main body by removing the knob 17 shown in FIG. This is paper ejection roller 7, stopper roller 15
This is so that it can be easily replaced when it wears out. The stopper roller 15 is installed in the notch provided in the impression cylinder IC.
This is to prevent the paper ejection roller 7 from falling down, and prevents the paper ejection roller shaft 1 from falling while rotating on rings provided at both ends of the impression cylinder IC.

The paper ejection roller unit shown in Fig. 7 has two units arranged symmetrically with respect to the paper ejection roller axis 1 as shown in Fig. 6. The rollers 7 and 12 are moved in the direction shown by the arrow in FIG. 6 to set the position so that the rollers 7 and 12 are in contact with the area where there is no printed image.

FIG. 8 is a mechanical diagram showing another conventional example of a roller paper discharge mechanism of a printing press.

The shaft 33 is a lever 3 with the support 31 as a pivot.
7, and the biasing force of a spring 39 is applied, so that the paper discharge roller 30 rotates while being pressed against the impression cylinder IC by the force acting in the direction of arrow H. The support 3 is used as a stopper to prevent the paper discharge roller 30 from falling into the notch of the impression cylinder IC.
2, a screw 36 and a lock nut.

(Problems to be solved by the invention) In the forced roller paper ejection mechanism of the printing press shown in Figs. 4 to 7, as shown in Fig. 7, the paper ejection roller 1
When the printing paper passes over the ring 17 provided in the ring 1, a force F is applied in the direction shown by the arrow due to the stiffness of the printing paper. Therefore, the force of the ring-shaped plate spring 6 must be applied to the shaft portion of the roller shaft 1 through the pin 5 passing through the paper discharge roller 7 to provide a holding force sufficient to withstand this force F.

Therefore, the following problems arise.
First, this forced roller paper ejection mechanism has the problem that it is difficult to move because it is located in the back of the printing press and requires a considerable amount of force.

Secondly, since this operation is performed quite frequently, the tip of the pin 5 wears out, reducing the biasing force of the spring 6, causing the paper discharge roller unit to move during printing.

Thirdly, in order to stably discharge thin paper with a thickness of about 40μ to 50μ, the paper discharge roller shaft 1 must have high straightness. There is a problem in that the straightness is impaired and it is very difficult to correct the straightness.

Fourthly, since the gear 4 shown in Fig. 6 is fixed with a pin, replacing the stopper roller 15 when it wears out requires special tools such as driving and removing pins, which is impossible for general users to do. There is a point.

Fifth, as the paper ejection roller 7 and the stopper roller 15 wear out, the roller shaft 1 approaches the impression cylinder IC in a trajectory like the arrow A shown in FIG. gear 3
As a result, the distance between gears 3 and 4 is insufficient, causing gear noise between gears 3 and 4, or the rotational force of gear 3, which is the drive side, causes gear 4 to
There is a problem in that the roller shaft 1 on the side to which is fixed is lifted in the direction opposite to the arrow A and tends to become unstable, resulting in an unstable paper ejection state.

On the other hand, in the forced roller paper ejection mechanism of the printing press shown in Fig. 8, in order to move the position of the paper ejection roller in accordance with the printed image, it is first necessary to loosen the knob screw 35, move it, and then tighten it again to fix it. Moreover, the paper discharging roller 30 suffers from poor paper discharging performance for solid materials due to the trailing rotation due to contact friction with the impression cylinder IC. Furthermore, since the paper ejection roller 30 is made of soft rubber, it is easily abraded, ink adheres easily and is difficult to remove, and the paper ejection roller 30
The disadvantage is that it is difficult to replace when it wears out.

The purpose of this invention is to solve all of the above-mentioned problems and improve operability and functional stability by using compression springs in the paper delivery roller axis of the printing press's forced roller paper delivery mechanism and the rotation transmission mechanism of the paper delivery roller. An object of the present invention is to provide a forced roller paper ejection mechanism for a printing press that improves performance.

(Means for Solving the Problems) In order to achieve the above object, the forced roller paper ejection mechanism of the printing press according to the present invention includes a paper ejection roller drive gear to which the rotation of the cylinder is transmitted, and the paper ejection roller drive gear. a paper ejection roller shaft which is rotatably supported and fixed to the shaft, and a paper ejection roller which has a radius that can rotate at a circumferential speed faster than the peripheral speed of the impression cylinder and is movable in the axial direction of the paper ejection roller shaft. and a compression spring that is wound around the paper ejection roller shaft, one end of which is fixed to the paper ejection roller side, and is tightened to the paper ejection roller shaft when the printing press rotates in the normal direction. The diameter of the paper ejection roller shaft is reduced and the compression spring is locked, and when the printing press is stopped, the end face of the compression spring is pushed to expand the spring diameter so that the paper ejection roller shaft can move in the axial direction. It is composed of

(Example) The present invention will be described in detail below with reference to the drawings and the like.

1 to 3 are schematic diagrams showing an embodiment of the forced roller paper ejection mechanism of a printing press according to the present invention, and FIG. 2 is a diagram showing section D in FIG. 1, and FIG. 2 is a diagram showing section C in FIG. 1. FIG. In addition, Figure 1 shows
The above-mentioned FIG. 6, FIG. 2, and FIG. 3 are diagrams that perform the same function as the above-mentioned FIG. 7.

The forced roller paper ejection mechanism for a printing press according to the present invention was developed in order to solve the first to fifth problems of the conventional forced roller paper ejection mechanism shown in FIGS. 5 to 8. .

First, in order to solve the first to third problems,
In order to transmit rotation and maintain the position of the paper ejection roller shaft and paper ejection roller, a compression spring is used instead of the conventional pin and ring-shaped leaf spring.

In FIGS. 1 to 3, 20 is a paper discharge roller shaft;
21 is a paper discharge roller, 22 is a compression spring, 23 is a housing, 24 is a gear, 25 is a gear, 26 is a compression spring, and 27 is a lever.

The inner diameters of the springs 22 and 26 are slightly smaller than the outer diameter of the paper discharge roller shaft 20.
It is in a state where it is lightly wrapped around. spring 2
One end of 2, 26 is connected to the paper discharge roller 21 and the housing 2.
It is inserted through the elongated hole of No. 3.

The gear 24 shown in FIG. 1 rotates in the same direction as the impression cylinder IC, as shown in FIG. 2, by transmitting the rotational force from the cylinder gear via two idle gears (not shown). At this time,
Since the compression spring 22 has an inner diameter smaller than the diameter of the paper discharge roller shaft 20, a force that causes the inner diameter to contract due to its rotational resistance acts on the compression spring 22. It rotates together with the paper roller 21 and the housing 23.

The outer diameter of the paper ejection roller 21 is larger than the pitch circle diameter of the gear 24, and its circumferential speed is faster than the circumferential speed of the impression cylinder IC.
A force in the direction opposite to the rotational direction (force in the E direction in FIG. 2) always acts on the compression spring 22, and a force that further reduces the diameter acts on the compression spring 22. Therefore, the roller shaft 20 and the compression spring 22 are in a tightened state, and the paper ejection roller 21
It is possible to stably transmit rotation and maintain position.

When the rotation of the paper ejection roller shaft 20 is stopped, no force in the contraction direction is applied to the compression spring 22. Therefore, when the lever 27 is moved from side to side, the ejection roller 21 and the housing 23 are moved against the compression spring 22. When one end is pressed, the force of compression acts on the compression spring 22 and the force of expansion of the coil diameter acts, and the holding force between the roller shaft 20 and the compression spring 22 becomes zero, and the parts C and D in Fig. 1 are slightly It can be moved.

Furthermore, since the roller shaft 20 does not require groove machining, machining the shaft 20 to have high straightness is
This can be done relatively easily.

As is clear from the above explanation, the first to third problems of the conventional printing presses (FIGS. 4 to 7) have been solved.

Next, in this embodiment, the gear 24 shown in FIG.
Screws 25 are used to attach it. Therefore, even a general user can easily attach and detach the screws, paper ejection roller, and stopper roller, and the fourth problem has been solved.

Furthermore, the fulcrum position of the paper discharge roller shaft 20 shown in FIG. Furthermore, since parts corresponding to the knob 17 shown in FIG. 5 are not used, this embodiment is easier to attach and detach than the entire part shown in FIG. This means that the point has been resolved.

Note that the gear 24 shown in FIG. 1 and the gear 4 shown in FIG. It is provided on the opposite side from the conventional one because of this reason, and because it is easier to drive the paper ejection roller shaft 20 than on the non-operation side as shown in FIG.

(Effects of the invention) As explained in detail above, according to the invention,
Because the circumferential speed of the forced paper ejection roller is faster than the cylinder circumferential speed, a compression force acts on the diameter of the compression spring installed between the roller drive shaft and the paper ejection roller when the printing press rotates forward, causing the shaft and spring to lock. When the printing press is stopped, the holding force between the compression spring and the roller drive shaft is small, and when the end face of the compression spring is pushed, the spring diameter swells, causing the holding force between the shaft and the spring to disappear. By using this method, we were able to improve the operability and functional stability of the forced roller discharge mechanism of the printing press.

[Brief explanation of the drawing]

1 to 3 are schematic diagrams showing an embodiment of the forced roller paper ejection mechanism of a printing press according to the present invention, and FIG. 2 is a diagram showing section D in FIG. 1, and FIG. 2 is a diagram showing section C in FIG. 1. FIG. 4 to 7 are assembly diagrams showing conventional examples of a forced roller paper ejection mechanism for a printing press. FIG. 8 is a mechanical diagram showing another conventional example of a roller paper discharge mechanism of a printing press. 1... Paper ejection roller shaft, 2... Gear, 3... Gear,
4... Gear, 5... Pin, 6... Ring-shaped leaf spring, 7... Paper ejection roller, 8... Support shaft, 9... Lever, 11... Paper ejection roller, 12... Roller, 13...
... Gear, 15 ... Stopper roller, 16 ... Plate, 17 ... Knob, 20 ... Paper ejection roller shaft, 21
... Paper ejection roller, 22 ... Compression spring, 23 ... Housing, 24 ... Gear, 25 ... Screw, 26 ...
Spring, 27...Lever, 28...Lever, 30...
...Paper ejection roller, 31...Support, 32...Support, 33...Shaft, 37...Lever, 39...Spring.

Claims (1)

[Claims for Utility Model Registration] (1) A paper discharge roller drive gear to which the rotation of the cylinder is transmitted, a paper discharge roller shaft to which the paper discharge roller drive gear is fixed and rotatably supported; a paper ejection roller that has a radius that can rotate at a circumferential speed faster than the circumferential speed of the tension cylinder and that can move in the axial direction of the paper ejection roller shaft; and a paper ejection roller that is wound around the paper ejection roller shaft and has one end facing the paper ejection roller side. It consists of a compression spring that is fixed and tightened to the paper discharge roller shaft when the printing press rotates in the normal direction, and when the printing press rotates in the forward direction, the diameter of the compression spring contracts and the paper discharge roller shaft and the compression spring are locked. A forced roller paper ejection mechanism for a printing press, which is configured to move the paper ejection roller shaft in the axial direction by pushing the end face of the compression spring to expand the diameter of the spring when the printing press is stopped. (2) The forced roller paper ejection mechanism for a printing press according to claim 1, wherein the paper ejection roller drive gear is screwed and fixed to the paper ejection roller shaft.