JPS6312268Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotary printing device, and particularly to the structure of a power transmission mechanism using a link mechanism.

A rotary printing device includes a main frame, a printing device block including a group of rolls having printing rolls on the front side of the main frame, a feed pawl that conveys a printed product, and a guide rail that guides the printed product. It consists of a feeding device block.

Conventionally, a belt was used as a means of transmitting the rotation of the motor to the printing roll, so it was necessary to keep the tension of the belt constant, so one part of the printing device block was fixed and the printing roll was moved in a circular orbit. The printing roll was adjusted to the height of the item to be printed by moving it in a drawing motion.

However, because the printing roll moves in a circular orbit, the printing position between the printing roll and the object to be printed is not constant, resulting in misalignment. This necessitates adjustment with the printing roll, which has the disadvantage of complicating printing work.

Further, as another means, a method using bevel gears and splines has been proposed.

Since this method uses splines, the printing device block can be moved up and down parallel to the guide rails, so that even if the height of the printing object changes, the printing position will not shift.

However, with this structure, in order to move the printing roll up and down, the bevel gear and spline must be tightly fitted, and the bevel gear and spline must be highly accurate, which requires a large amount of manufacturing cost. There was a drawback.

This invention was proposed to improve the above-mentioned drawbacks, and is a power transmission mechanism for a rotary printing device that has a small cost and simple structure, and allows for extremely easy adjustment of the printing position between the printing roll and the printed product. It provides:

This invention will be explained below based on the embodiment shown in FIGS. 1 and 2.

FIG. 1 is an enlarged view of the main part of the structure of the power transmission mechanism of this invention.

The first gear 1 is fixed to a shaft 19 that operates a feed pawl 14 for conveying the printed product, meshes with a second gear 2 via a first link 5, and is rotated by transmission of the rotation of the motor. It is designed to move.

The second gear 2 meshes with the third gear 3 via a second link 6, and is provided to rotate as the first gear 1 rotates.

The third gear 3 meshes with the fourth gear 4 via a third link 7 and is provided between the first gear 1 and the fourth gear 4 via a fourth link 8. The second gear 2 is connected to the fixed shaft 9
It is provided so as to be rotated by the rotation of.

The fourth gear 4 is fixed to the shaft 27 of the printing roll 12, rotates by the rotation of the third gear 3, and moves on a straight line connecting the center of the first gear 1 and the center of the fixed shaft 9. It is set up so that it can be moved.

Further, the first gear 1 and the fourth gear 4 and the second gear 2 and the third gear 3 have the same number of teeth and modules, respectively, and the first link 5, the third link 7, and the fourth gear The links 8 were held so that the shaft hole distances were equal, and the distance between the centers of the second gear 2 and the third gear 3 was equal to the distance between the centers of the first gear 1 and the fixed shaft 9. It's structured.

Next, the operation will be explained.

Now, when the rotation of the motor is transmitted to the first gear 1, the first gear 1 rotates, and the second gear 2, which is meshed with the first gear 1, is transferred to the first gear 1. The third gear 3 rotates due to the rotation of the second gear 2 and meshes with the second gear 2. The third gear 3 rotates due to the rotation of the second gear 2 and meshes with the third gear 3. The fourth gear 4 rotates due to the rotation of the third gear 3, and the first gear and the fourth gear 4 rotate in synchronization.

Next, the fourth gear 4 is connected to the center of the first gear 1 and the fixed shaft 9 without destroying the correspondence relationship with the first gear 1.
When moved upward on a straight line connecting the centers of , the third gear 3 rotates counterclockwise and the second gear 2 rotates clockwise. Approach a straight line connecting the centers.

In other words, the movement of the second gear 2 and the third gear 3 changes the correspondence between the first gear 1 and the fourth gear 4 caused by moving the fourth gear 4 upward. It serves to absorb strain, and therefore the fourth gear 4 can be moved upward without disrupting the correspondence between the first gear 1 and the fourth gear 4.

Moreover, when moving the fourth gear 4 downward, the third gear 3 rotates to the right and the second gear 2 rotates to the left.

Next, a rotary printing device using this invention will be explained.

The rotary printing device 10 consists of a main frame 11, a printing device block 16 with a printing roll 12, and a feed device block 16 with a feed pawl 14 and a guide rail 15.

To explain the transmission mechanism that transmits the rotation of the motor, the first gear 1 is fixed to a shaft 19 supported by the front panel 17 and the rear panel 18, and the second gear 2 is fixed to the shaft 20 fixed to it. It meshes with the second gear 2 via first links 5a and 5b from both sides, and also meshes with a reduction gear 23 fixed to the center shaft 22 of the pulley 21.

A power gear (not shown) for applying power to the feed pawl 14 is fixed to the shaft 19 at a position where the feed device block 16 is located.

Further, the front panel 17 is attached to the main body 11 with a mounting tool 24.
a, 24b, and the rear panel 18 is attached to the front panel 17 by shafts 25, 19, etc.

The second gear 2 is a shaft 2 to which a third gear 3 is fixed.
6 is meshed with the third gear 3 from both sides via second links 6a, 6a.

The third gear 3 is connected to the shaft 2 to which the fourth gear 4 is fixed.
Fixed shafts 9a, 9 are provided on the front panel 17 and the rear panel 18 and mesh with the fourth gear 4 from both sides through third links 7a, 7b.
b via fourth links 8a and 8b.

The shaft 27 is connected to the front panel 28 of the printing block 13.
and a rear panel 29, and a printing roll 12 is attached to the tip thereof, and this printing roll 12 has a feeding claw 14 that extends the circumference of the roll.
It is set equal to the pitch length of.

The printing device block 13 can be moved up and down parallel to the guide rail 15 by means of a screw 30.

Next, to explain the movement, the rotation of the motor is transmitted to the deceleration gear 23 on the center shaft 22 of the pulley 21, and then transmitted to the first gear 1 meshing with this deceleration gear 23, which rotates. , the second gear 2, the third gear 3, and the fourth gear 4, and the printing roll 12 rotates.

On the other hand, a power gear (not shown) for conveying the feed pawl 14 fixed to the shaft 19 to which the first gear 1 is fixed rotates, and the feed pawl 14 is moved to move the printing material to the guideline 15. The printing roller 12 prints on a predetermined portion of the printing material.

At this time, the first gear 1 and the fourth gear 4 rotate synchronously with different rotation directions, and the direction in which the feed pawl 14 conveys the printing material and the direction in which the printing roll 12 rotates. are in the same direction, and therefore printing on the substrate is performed smoothly.

Here, when the printing device block 13 is moved upward by the screw 30, the printing roll 12 is moved upward parallel to the guide rail 15, that is, the fourth gear 4 is moved upward. However, as mentioned above, there is no change in the correspondence between the first gear 1 and the fourth gear 4,
Further, the first gear 1 and the power gear (not shown) move without any change in the correspondence relationship.

Therefore, the printing position of the printing material on the printing roll 12 before the printing roll 12 is moved upward is the same as the printing position on the printing material on the printing roll 12 after the printing roll 12 is moved upward. This means that the position is the same.

This means that even if the object to be printed has the same shape but changes in height, the printing position will be at the desired position, and there is no need to adjust the printing position.

As explained above, by simply combining four gears, one fixed shaft, and four links using a link mechanism in the structure of the power transmission mechanism of a rotary printing device, the first gear and the fourth gear can be connected. The structure allows the fourth gear to be moved without disrupting the correspondence relationship between the two, making it extremely easy to adjust the printing position between the printing roll and the printed material. This has the practical effect of greatly contributing to the development of society.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main parts of the embodiment according to this invention.
FIG. 2 is a partial sectional view of an embodiment in which this invention is applied to a rotary printing device. 1...first gear, 2...second gear, 3...
Third gear, 4... Fourth gear, 5... First link, 6... Second link, 7... Third link, 8... Fourth link, 9... Fixed shaft , 10...
...Rotary printing device, 11...Main frame, 1
2...Printing roll, 13...Printing device block, 14...Feeding claw, 15...Guide rail, 1
6... Feeding device block, 23... Reduction gear.

Claims (1)

[Claims for Utility Model Registration] A feeding device block equipped with a feed claw that conveys a printing object by transmitting the rotation of a motor, and a printing roll that prints on the printing object by transmitting the rotation of the motor. In a power transmission mechanism that transmits the rotation of the motor to the feed pawl and the printing roll of a rotary printing device including a printing device block, a first gear is fixed to a shaft that operates the feed pawl, The second gear meshes with a second gear via a first link, and is provided to rotate by transmission of the rotation of the motor, and the second gear engages with a third gear via a second link. The third gear meshes with the fourth gear via a third link and rotates with the rotation of the first gear, and the third gear meshes with the fourth gear via a third link. is connected to a fixed shaft provided between the first gear and the fourth gear, and is provided to rotate according to rotation of the second gear, and the fourth gear is connected to a fixed shaft provided between the first gear and the fourth gear, and the fourth gear fixed to the shaft of the roll, rotated by the rotation of the third gear, and moved on a straight line connecting the center of the first gear and the center of the fixed shaft. A power transmission mechanism for a rotary printing device characterized by a structure.