JPS5830817B2 - flat printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing machine for applying flat printing on the surface of a printing medium, and more particularly to a printing machine suitable for applying flat printing on the surface of a square bottle. be.

Devices that print on the sides of prismatic bodies such as square bottles have existed for a long time, and there are many types.

The main type of printing machine used in the bottle making industry as a printing machine for square bottles has a large number of spindles attached to a pair of endless chains that move in parallel, each spindle chucks a square bottle, and the spindles are rotated at the printing position. The bottle is pushed upward to bring the square bottle close to the flat printing screen, and the screen is pressed with a squeegee to print on the surface of the square bottle.

This type of printing machine has the advantage of being able to easily set up multiple printing positions and perform multicolor printing, but because it has a large number of spindles, it takes a long time to change types, and it is also troublesome to maintain the machine on a daily basis. However, it was not always satisfactory due to other drawbacks such as poor printing accuracy and difficulty in high-speed operation because it was a chain conveyor type.

In addition to the above-mentioned type of printing press, there is also a semi-automatic printing press in which bottles are manually fed and taken out, but it goes without saying that they cannot operate at high speeds.

Therefore, no printing press has hitherto existed that can print accurately on the surface of a printing medium, such as a square bottle, at high speed using only a small number of spindles.

The present invention has been made to provide a new printing press that solves the drawbacks of the prior art described above, and the present invention will be described in detail below with reference to examples.

1 and 2 schematically show an apparatus according to an embodiment of the invention.

This apparatus has a rotary disk 1 that rotates intermittently at 60 degrees around a horizontal axis, and six sets of printing material holders 2 mounted at equal intervals around the rotary disk 1.

As shown in FIG. 2, this printing material holder 2 consists of a mouth holder 4 for chucking the mouth of the printing material 3 (a rectangular bottle in this embodiment) and a bottom holder 5 for chucking the bottom.

The mouse holder 4 is only rotatably supported by a bearing 6, but the bottom holder 5 is supported by a bearing 7 so as to be rotatable and slidable in the longitudinal direction, as will be explained in detail later. , the printing medium 3 can be attached and detached.

The spindle 8 of the bottom holder 5 has a planetary gear 9 at its rear end.
, and each planetary gear 9 is always in mesh with the sun gear 10.

As shown in FIG. 1, the sun gear 10 includes a gear for driving the sun gear that meshes with a reciprocating rack 11, and is rotated in forward and reverse directions (alternately) by the rack 11.

For convenience of explanation, the rotational direction of the rotary disk 1, that is, the counterclockwise direction in FIG. 1 is defined as the forward direction.

The rotation angle of the sun gear 10 can be freely set by adjusting the eccentricity of the cam roller 13 that engages with the yaw 12 that drives the rack 11.

The printing material 3 is chucked in the printing material holder 2 at the position A in FIG. 1, printed on it at the positions C and D, and taken out at the position F.

For example, if the number of teeth of the sun gear 10 is 225 and the number of teeth of the planetary gear 9 is 45, and if the sun gear 10 is rotated in forward and reverse directions by 108 degrees, then when the rotating disk 1 rotates 60 degrees, the sun will simultaneously rotate. If the gear 10 is rotated in the positive direction by 0, the rotation speed of the planetary gear 9 will be 1 1/2 as given by the following formula σ
becomes.

This means that when the planetary gear advances to the next position due to the rotation of the rotary disk 1, the planetary gear rotates 180° clockwise. While the printing medium 3, such as a chucked square bottle, advances from position C to position D (this is a 180 degree inversion, which is convenient for printing on both opposing sides of the square bottle).

However, in this printing machine, when the rotary disk 1 is stopped, the sun gear 10
is reversed by 180 degrees, so if the above configuration is maintained, the planetary gear 9 will rotate 1.5 times as shown in the following equation.

Therefore, in this state, it is impossible to perform plane printing on the surface of a square bottle or the like while the rotary disk is stopped. Measures have been taken to prevent such information from being transmitted.

This will be explained with reference to FIG.

FIG. 3 is a sectional view showing the relationship among the bottom holder 5, spindle 8, planetary gear 9, etc.

The spindle 8 consists of an outer spindle sleeve 14 and an inner spindle shaft 15, the spindle sleeve 14 being slidably supported longitudinally by a linear motion bearing 16 but not rotatable.

The spindle shaft 15 has needle bearings 17,1
It is rotatably supported inside the spindle sleeve 14 by B.

A planetary gear 9 is provided on the outer periphery of the left end of the spindle sleeve 14 via a ball bearing 19, and the planetary gear 9 is fixed to the clutch housing 20 by bolts 211.

And clutch housing 20 and spindle shaft 1
A ratchet mechanism 22 is provided between the two.

This ratchet mechanism 22 rotates the spindle shaft 15 only by σ when the planetary gear 9 rotates in the clockwise direction in FIG. .

(Note that FIG. 1 corresponds to the left side view of FIG. 3.

) Since the bottom holder 5 is fixed to the right end of the spindle shaft 15 by a bolt 23, the spindle shaft 1 is fixed to the right end of the spindle shaft 15 by a planetary gear 9 via a ratchet mechanism 22.
When the bottom holder 5 is rotated, the bottom holder 5 and the square bottle 3 chucked therein also rotate.

However, when the planetary gear 9 rotates counterclockwise in FIG. 1, the spindle shaft 15 remains stationary due to the action of the ratchet mechanism 22, so the square bottle 3 also remains stationary.

Combining the above explanation and the explanation of the planetary gear mechanism described with reference to FIG. 1, the positive direction (counterclockwise direction) of the sun gear 10
It is clear that the rotation of the sun gear 10 in the opposite direction does not rotate the rectangular bottle 3, although the rotation of the sun gear 10 in the opposite direction rotates the planetary gear 9 clockwise, thereby reversing the rectangular bottle 3, which is the printing medium.

In this way, when the sun gear 10 is reversed, the square bottle 3 remains stationary and can be flat-printed on its side by suitable flat-screen printing means 24 as shown in FIG. .

The planar screen printing means 24 has a screen 52 attached to the tip of a screen frame 51 that moves up and down in synchronization with the rotation of the rotary disk 1, and a roller 154 that runs on a guide rail 53 provided on the screen frame 51. The screen 5 is configured so that the squeegee 55 that is pulled by the screen moves when the rotary plate 1 stops.
It operates in synchronization with the rotary disk drive mechanism so that the screen frame 51 is lowered so that the screen frame 51 comes into contact with the side surface of the square bottle 3, and when the rotary disk 1 rotates, the screen frame 51 is raised.

Now, as mentioned above, when the printing material 3 is transferred from A to B and from B to C by the rotation of the rotary disk 1, the printing material rotates by a predetermined angle (for example, 180'). 9 rotates exactly 180 degrees at a time, there is a ratchet mechanism 22 between the spindle shaft 15 and the planetary gear 9, so even after the planetary gear 9 has stopped, there is a risk that the spindle shaft 15 will rotate excessively due to inertia. There is.

To prevent this, the right end of the spindle sleeve 15 (
The flange 25 is fixed, and the brake shoe 26 is pressed against it by a spring 27.

Since the brake shoe 26 can be considered to be integral with the bottom holder 5, the free rotation of the bottom holder 5 or the spindle shaft 15 due to inertia is eventually prevented by frictional force.

In this way, the spindle shaft 15 is held so as not to rotate freely by the frictional force of the brake shoe 26, but when printing is performed, a load of 10 to 20 Kp is applied to the printing material. There is a risk that the printing material 3, bottom holder 5, spindle shaft 15, etc. may rotate due to this load.

There is.

Therefore, in order to prevent this (this spindle shaft 15
A roller wheel 28 is fixed to the left end of the wheel with a key 29.

Four rollers 30 are attached to the roller wheel 28, and as shown in FIG. to completely prevent the printing material from rotating during printing.

Note that this press plate 32 is attached to the support arm 6H fixed to the machine base via parallel links 62 and 63, and is pivoted to the upper end of a vertical column 64 erected at the center thereof. By moving the drive arm 65 up and down in synchronization with the screen frame 51 described above, when the rotary disk 1 stops and the screen frame 51 descends, the suppression plate 32 descends and presses the roller 30.

As described above, when the printing material 3 is supplied to or taken out from the printing material holder 2, the bottom holder 5 retreats to the left.

This operation is caused by the cam follower 31 attached to the lower Q of the spindle sleeve 14 being moved by a grooved cam (not shown).

What has been explained above is the case where printing is performed on two opposing sides of a square bottle, but when printing on four sides of a square bottle, if the rotation angle of the sun gear 10 is 90 degrees, the planetary gear 9
Since the paper is rotated by 90 degrees when being transferred by the rotary disk 1, it is also possible to print on four sides using the positions B, C, D, and E in FIG.

Of course, it is also possible to print on printing materials having shapes other than square bottles in the same way.

The present invention has the following excellent effects.

(2) Since the printing press of the present invention has only a small number of spindle heads, it is easy to change varieties and maintain daily rootstocks.

(2) The printing press of the present invention does not release the printing material after it has been chucked once, and since the movement and rotation during that time are all performed by a gear mechanism, highly accurate positioning is possible.

■ The printing machine of the present invention uses a planetary gear mechanism to rotate the printing material by a predetermined angle and transport it between multiple printing positions, and prints two-dimensional images one after another on the surface of a polygonal column. It is possible to do so.

■ Since the printing press of the present invention has a means for preventing the rotation of the sun gear in the opposite direction from being transmitted to the printing material holder, the printing material can be kept stationary during that time, and flat printing can be performed on the surface of the printing material. can be applied.

(2) The printing press of the present invention can operate at higher speeds than conventional chain conveyor type flat printing machines.

As described above, the printing press of the present invention completely solves the shortcomings of conventional flat printing presses, and makes a great contribution to the industrial world.

[Brief explanation of drawings]

Figure 1 is a side view showing the operating principle of the printing press of the embodiment;
The figure is a front view, Figure 3 is a sectional view of the main part, and Figure 4 is a press plate 3.
FIG. 1 is a side view showing the operation of FIG. 1... Rotating disk, 2... Printing material holder, 3... Printing material, 800. ...Spindle, 9...10. Planetary gear, 10...Sun gear, 15...Spindle shaft, 22...
...Ratchet mechanism, 24...Flat printing means.

Claims (1)

[Claims] 1. A rotary disk that rotates intermittently in a fixed direction, and a plurality of printing materials that are rotatably installed around the rotary disk,
In a printing press equipped with a planetary gear installed coaxially with each printing material, and a sun gear that rotates alternately in the forward and reverse directions from each planetary gear and the force (fms), the sun gear rotates in the opposite direction. A ratchet means is provided between the planetary gear and the printing material holder to prevent rotation from being transmitted to the printing material holder, and a locking mechanism is provided on the printing material holder to prevent its rotation by an external force. A plane printing machine characterized in that, by these actions, plane printing is performed on the surface of a printing medium while the printing medium is stationary.