JPS5823223B2 - Continuous printing device on the outer circumference of the container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an apparatus for continuous screen printing on the outer peripheral surface of containers having a non-circular cross section, such as round bottles, square bottles, or straight or tapered portions of bottles. Regarding.

Printing machines for continuous screen printing on perfectly circular containers are already widely used, but no machines have been developed for performing similar continuous screen printing on containers with non-perfect circular cross sections.

This is because the diameter of a perfectly circular cross-section container is constant, so the circumferential speed of the screen and container is the same, and the contact position between the container and screen is constant both horizontally and vertically, so the printing mechanism is relatively simple. However, in the case of containers with non-round cross sections, the diameter of the container is not constant, so printing is incomplete or impossible with conventional machines.

In other words, since the diameter of a container with a non-round cross section is not constant, the circumferential speed of the outer circumference of the container fluctuates when the shaft rotates, and the contact position of the printing screen and squeegee with the outer circumference of the container is continuous in both the vertical and horizontal directions. fluctuate.

Therefore, in order to perform continuous screen printing on the outer circumference of a container with such a cross-sectional shape without blurring, bleeding, or ink shading, an extremely complex mechanism is required. It has been considered impossible to do so.

Therefore, it is an object of the present invention to provide a printing device capable of excellent continuous screen printing without bleeding, blurring, or ink shading even on the outer peripheral surface of a container with a non-perfect round cross section.

The printing apparatus of the present invention will be described below with reference to the drawings.

Explain in detail.

In order to perform satisfactory continuous screen printing as described above on the outer circumferential surface of a container with a non-perfect circular cross section, the apparatus of the present invention at least (1) synchronizes the outer circumferential surface of the container and the screen movement speed, and (
2) Keeping the printing pressure of the screen and squeegee constant on the printed surface of the container; (3) Moving the position of the squeegee horizontally in synchronization with the continuous horizontal variation of the contact position between the outer periphery of the container and the screen.

Including the first-class mechanism,
Furthermore, these mechanisms are configured to operate simultaneously.

Although the apparatus of the present invention is generally applicable to containers having a non-circular cross section, the drawings will be explained using a bottle as an example.

2 As shown in Fig. 1, a bottle 1 with a non-round cross section is held between a bottom chuck 2 and a mouthpiece 3 that can rotate on its axis, and is held horizontally so that it can rotate on its axis by a bearing 4 on the bottom chuck side and a bearing 4' on the mouthpiece side. is supported by

2. A shaft 5 extending horizontally rearward is integrally attached to the rear of the bottom chuck 2, and the shaft 5 has a cam 6 having the same shape as the cross section of the printed portion of the bottle and an outer peripheral groove 7 having the same shape as the outer periphery of the printed cross section of the bottle. A circumferential speed synchronous drive roller 7 having a circumferential velocity 1 is fixed coaxially.

3 As is clear from FIGS. 1 and 2, a screen frame 9 covered with a screen 8 is placed almost horizontally above the bottle, and the screen lightly contacts the top of the printed surface of the bottle or has a slight rearrangement. They are positioned so that they are separated from each other.

The screen frame 9 is supported by a horizontal support plate 10 that is integrally connected in the horizontal direction via an arm 9', and a screen movement guide member 12 is connected to the screen movement guide member 12 via a rod 11 that extends upward from the horizontal support plate 10 substantially vertically. On the lower surface of the horizontal support plate 10, an elongated bar 13 extends substantially parallel to the longitudinal axis of the screen frame 9 and perpendicular to the bottle axis, and the lower end of the bar 13 is connected to the lower surface of the horizontal support plate 10. It is slidably engaged with the top of the cam 6 having the same cross-sectional shape as the bottle.

The vicinity of the tip of the rod 11 extending upward from the horizontal support plate 10 is fitted into and engaged with an opening guide member 12' provided at the edge of the screen movement guide member 12 so as to be vertically slidable.

The screen movement guide member 12 includes a plurality of guide rollers 14
It is configured to be able to horizontally reciprocate along the guide rail 15 in a direction perpendicular to the bottle axis, and synchronizes the circumferential speed with the angles 12" 12// fixed at both ends of the screen movement guide member 12. The drive roller 7 is engaged by an end belt 16, and the end belt 16
is wound once within the roller groove 7', and its both ends are fixed to the angles 12', 12' of the guide member 12, so that the rotational movement of the circumferential speed synchronous drive loaf 7 is controlled by the screen guide member 12. is transmitted synchronously with the translational motion of the arrow.

Although not shown in FIG. 1, the guide member 12 is reciprocated by a motor 43, which is a power source, via a known reciprocating cam.

Further, in the illustrated example, the screen guide member 12 is moved along the guide rail 15 using guide rollers, but the present invention is not limited to this, and other known moving means may be used.

In this device, since the circumference of the groove 7' of the peripheral speed synchronous drive roller 7 has the same shape as the cross section of the printed part of the bottle, the peripheral speed of the bottle 1, which has a non-round cross section, is transmitted via the belt 16 and the screen movement guide. The speeds of the members 12 are synchronized so that there is no misalignment between the outer periphery of the bottle printing section and the contact surface of the screen.

Further, the tip of the bar 13 extending downward from the horizontal support plate 10 supporting the screen frame 9 engages with the outer periphery of the cam 6, which has the same shape as the printed cross section of the bottle, while reciprocating in the direction perpendicular to the extended line of the bottle axis. Therefore, the screen 8 reciprocates in the horizontal direction while rising and falling up and down in accordance with the fluctuation in the height of the top edge (radius) of the non-round bottle while keeping the contact pressure with the bottle printing surface constant.

A squeegee 18 supported by a support rod 17 is arranged on the screen 8, and an upper squeegee cylinder 19
is in contact with the screen 8 under a constant pressure.

The squeegee 18, the support rod 17, and the squeegee cylinder 19 collectively constitute a squeegee unit, and are mounted on an arm 21 of a block 20 via a guide groove 22 so as to be slidable in a direction perpendicular to the bottle axis. There is.

Note that the bottles printed by the apparatus of the present invention are non-perfect circles;
Therefore, the top edge of the bottle printing surface fluctuates up and down;
In order to keep the printing pressure of the squeegee against the screen constant, the squeegee must also move up and down as the height of the contact surface between the bottle printing surface and the screen changes.

Therefore, in the specific example shown in FIG. 1, one end 23 of the mounting block 20 is vertically slidably engaged with the machine frame 24 of one device, and in order to synchronize the vertical movement of the squeegee and the screen, the mounting block 20 is mounted on the block 20. A spacer rod 25 is fixed toward the screen frame horizontal support plate 10 below.

Note that during installation, the tip of the spacer rod 25 attached to the block 20 is in contact with the horizontal support plate 10 below, but during the printing operation, the horizontal support plate 10 moves back and forth by the screen movement guide member, so the tip of the spacer rod 25 is attached to the block 20. and the horizontal support plate 10 are in sliding contact.

Therefore, it is preferable to use a roller 26 or the like at the tip of the spacer rod to reduce the frictional resistance.

In this way, the screen and squeegee move up and down synchronously in response to variations in the height of the top ridge (radius) of the rotating non-round bottle, so that the screen and squeegee applied to the printing surface of the non-round bottle are - The pressing force, that is, the printing pressure, is always maintained constant despite level fluctuations on the printing surface.

Next, as shown in FIGS. 4a to 4c, non-.

When printing a perfectly round bottle 1, unlike the case of a perfectly round bottle, the position of the contact point between the bottle printing surface 1' and the screen 8 changes continuously at a certain period due to the rotation of the bottle.

Therefore, in order to prevent blurring, blurring, and ink shading on printing, the printing surface 1' must always be in contact with the screen 8.

The printing pressure, ie the squeegee 18, must be in position.

Therefore, the apparatus of the present invention has a squeegee continuous movement mechanism that responds to changes in the contact position between the screen and the printing surface.

An example of this squeegee continuous movement mechanism will be described with reference to FIG. 3. A guide plate 28 having an elongated retaining rod 27 is attached to the support rod 17 of the squeegee 18 in a direction perpendicular to the axis of the bottle. , the engagement rod 27 of the guide plate 28 is connected to a long hole 30 provided at one end of the hook member 29.
is engaged with.

The hook member 29 is supported so as to be rotatable in the direction of the arrow X using the corner 31 as a fulcrum.

On the other hand, the other end of the hook member 29 is pivotally engaged with one end of the piston rod 32 via a universal joint 32'.

The other end of the piston rod 32 is connected to a groove 3 provided in a rotary grooved cam 33 via a universal joint 32' and a guide roller 35.
As shown in FIG.
The support rod 24' is pivoted and supported at the tip of a support rod 24' which is suspended from the support rod 24'.

Thus, the piston rod 32 transmits the reciprocating motion generated by the engagement with the groove 34 of the rotating grooved cam 33 to the hook member 29 via the guide roller 35 at the other end, and the hook member 29 31 as a fulcrum, the reciprocating motion of the piston rod is changed into a reciprocating motion in a direction approximately perpendicular to the reciprocating motion, and the power is transferred to the squeegee.
is transmitted to the engagement rod 27 of the guide plate 28.

As a result, the squeegee continuously moves back and forth in accordance with the rotation of the rotary groove cam.

Note that during the printing operation, the squeegee performs the above-mentioned vertical movement at the same time as this continuous movement, so the engaging rod 27 of the squeegee engages with the long groove or hole 30 of the hook member.
should be a certain length.

As shown in FIG. 1, the shaft 36 of the rotary grooved cam 33 is connected to a gear 40 attached to a driven shaft 401 of the motor 43 via pinion gears 37, 37, a shaft 38, and a gear 39. The groove 34 provided in the rotary grooved cam rotates under the influence of power, and the groove 34 provided in the rotary grooved cam forms a predetermined bottle printing cross-sectional shape in synchronization with the movement of the contact position between the bottle printing surface and the screen when the squeegee continuously moves. It is configured with a pre-designed curved groove accordingly.

The rotary grooved cam 33 may have one or more grooves 34 depending on the cross-sectional shape of the bottle, and is configured to be replaceable according to the cross-sectional shape of the bottle to be printed.

In the figure, numeral 41 indicates a bearing of each member, and numeral 42 indicates a spring of each member.

The squeegee continuous movement mechanism is not limited to the mechanical operation described above; for example, it electrically detects the contact position between the bottle printing surface and the screen, and connects the detected signal to the squeegee drive source to continuously move the squeegee unit. It is also possible to move.

According to the printing device of the present invention, the circumferential speed of the bottle with a non-round cross section and the moving speed of the screen are synchronized and continuously fluctuate up and down at the same time as the level of the contact surface between the screen and the squeegee and the bottle printing surface changes. And as the contact position between the printing surface and the screen changes in the horizontal direction, the squeegee
Since the horizontal position of the bottle changes synchronously, the printing surface of the bottle with a non-round cross section is always in close contact with the screen, and a constant printing pressure can always be applied at the correct position.

As a result, the excellent effect of being able to perform clear continuous screen printing without bleeding, blurring, ink shading, etc. even on the outer peripheral surface of a container with a non-perfect circular cross section, which was previously considered impossible, was brought about.

[Brief explanation of drawings]

Fig. 1 is a side view showing a specific example of the device according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a partially cutaway plan view of Figs. 1 and 2, and Figs. 4a to 40 are FIG. 3 is an explanatory diagram showing a change in the contact position between the pin and the screen. 2...Bottom chuck, 6...Bottle cross section circular cam,
7... Peripheral speed synchronous drive roller, 8... Screen, 9... Screen frame, 10... Horizontal support plate, 12... Screen movement guide member, 15... Guide rail, 16...・Ended belt, 18...Squeegee-119...Squeegee cylinder, 20...Prolock installation, 33...Rotary groove cam.

Claims (1)

[Claims] 1. Continuous printing is performed on the outer peripheral surface of a container with a non-perfect circular cross section. In this device, a circumferential speed synchronous drive roller 7 having a cam 6 having the same shape as the outer periphery of the printed cross section of the bottle and an outer circumferential groove 7' having the same shape as the outer periphery of the printed cross section is coaxially mounted on the rotating shaft 5 of the bottom chuck 2 that supports the bottle 1. A printing screen movement guide member 12 is disposed so as to be able to reciprocate along a guide rail 15 extending in a direction substantially perpendicular to the axis of the rotating shaft 5, and in a longitudinal direction of the guide member 12. Near both ends, the circumferential speed synchronous drive roller 7 is wound once,
Each one of the ends of the belt is fixed, and a printing screen frame 9 extending in a horizontal direction substantially perpendicular to the bottle axis is supported on one side edge of a horizontal support plate 10 extending parallel to the screen frame. The horizontal plate 10 is provided along the longitudinal direction of the lower surface thereof. The cam 6 slides on the outer periphery of the cam 6 through an elongated bar, and is guided by the screen movement guide member 12 while being supported in a vertically movable manner via a rod 11 protruding from the upper surface of the horizontal plate. It is configured to allow reciprocating movement. A support arm 20 that suspends and supports the squeegee 18 in sliding contact with the printing screen is attached to the horizontal support plate at a constant interval by a spacer rod 25 that is fixedly attached to the lower surface of the support arm and whose lower end is in sliding contact with the upper surface of the horizontal support plate 10. The squeegee unit is slidably supported by a fixed frame 24 so that it can move up and down integrally with the bottle axis, and the squeegee unit is supported so that it can slide in a direction perpendicular to the bottle axis. Apparatus according to claim 1, characterized in that the unit is configured to automatically displace its position in response to variations in the contact position between the screen and the printed surface of the bottle.