JPS59228Y2 - Master paper clamping device in card printing machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a master paper clamping device in a card printing machine.

For example, in a liquid type card printing machine, a master paper is clamped to a printing drum, printing paper is stacked on top of the master paper, and printing is performed by rotating the printing drum while applying pressure with a press roller.

For this reason, in the past, an opening/closing mechanism for the clamp device was provided separately, which resulted in a disadvantage that the structure was complicated.

An object of the present invention is to provide a master paper clamping device whose structure is simplified by operating the clamping device by the press roller itself.

Examples of the present invention will be described below.

A rotating shaft 3 of a printing drum 2 is supported on a pair of side plates 1 constituting the frame, and a bearing 5 is slidably guided and supported in a long groove 4 in the drum radial direction provided in the side plate 1, and a press roller 6 is attached to this. The center portion of a spring 7, which supports a rotating shaft of the printer and has both ends supported on a side plate 1, is brought into pressure contact with the bearing 5, and the press roller 6 is brought into contact with the printing drum 2.

Each time a printing card P is inserted, the printing drum 2 rotates once in the direction of the arrow from a fixed position to perform printing, and then stops at the fixed position again by a clutch mechanism to be described later.

A first groove 8 into which the press roller 6 falls slightly at the fixed position and a second groove 9 shallower than the groove 8 which follows the groove 8 at the rear in the rotational direction are formed on the outer peripheral surface of the printing drum 2.

A plate-shaped clamper 10 is inserted into both the grooves 8 and 9, and the protrusion 11 formed thereon is engaged with the step 12 between the grooves 8 and 9, and the bent ears 13 at both ends of the clamper 10 are is pulled by a spring 14 attached to the end surface of the drum 2 to urge the clamper 10 to come into pressure contact with the bottom of the groove 9, and to maintain engagement between the protrusion 11 and the stepped portion 12.

In this locked state, the clamper 10 is located close to the rear side surface of the groove 9.

However, when the printing drum 2 stops at the fixed position, the press roller 6 pushes the front half of the clamper 10 and
0 is tilted against the force of a spring 14 using the stepped portion 12 as a fulcrum.

As a result, the rear end of the clamper 10 protrudes outward from the outer peripheral surface of the drum 2, creating a gap 15 between it and the groove 9.

A master guide table 16 is tilted and supported on the side plate 1 so that its tip faces the gap 15, and a printing paper guide table 18 is attached below it to face the wedge-shaped gap 17 between the clamper 10 and the breath roller 6. , attach the printing liquid tank 19 and the felt guide 20 directly above it, immerse the rear end of the felt 22 attached to this with the hinges 21 in the printing liquid in the tank 19, and place the front end directly above the front end of the guide table 18. Let it happen.

A one-way clutch 24 is provided on the outside of the side plate 1 between the shaft 3 and a gear 23 rotatably supported thereon.

The clutch 24 has a coil spring 27 wound around a collar 25 fixed to the end of the shaft 3 and a boss 26 of the gear 23, one end of which is locked to the collar 25, and the other end bent to form an operating piece 28. This is a known coil spring type one-way clutch.

The proximal end of the start lever 30 is fixed to a bracket 29 fixed to the outside of the side plate 1, and the elasticity of the lever 30 biases the tip so that the operating piece 2B is locked, and the start lever 30 is fixed to the middle part of the lever 30. The arm 31 is made to protrude inside the side plate 1 from a hole provided in the side plate 1, and the arm tip 32 is made to hang down to the side near the gap 17.

The gear 23 is rotationally driven from the electric motor shaft 33 via the reduction gear stage 34, but the explanation of the control device for the electric motor is omitted because it has no direct relation to the present invention.

Next, the effect of this proposal will be explained.

After placing the master paper on the master guide table 16 and inserting its tip sufficiently deeply into the gap 15,
When the printing paper P is inserted along the guide table 18,
The printing liquid is applied to the paper P by the felt 22, and the leading edge of the paper pushes the arm tip 32 to remove the tip of the start lever 30 from the operating piece 2B.

As a result, the clutch 24 is engaged and the gear 23 starts rotating the printing drum 2 in the direction of the arrow.

When the rotation starts, the clamper 10 pushes the press roller 6 out of the groove 8 and presses it against the groove 9, thereby closing the gap 15.

As a result, the leading end of the master paper is bent into an S-shape by the groove 9 and the clamper 10, is securely held on the drum 2 by the tension of the spring 14, and is wound around the drum 2.

At the same time, the paper P is also pressure-fed by the press roller 6 so as to overlap with the master paper and printed.

When the printing drum 2 rotates once, the paper P has finished printing and has been ejected, and the lever 30 has returned to its original position.
4 is cut and the drum 2 stops.

With this stop, the press roller 6 tilts the clamper 10 and falls slightly into the groove 8, thereby applying a braking action to the drum 2 and accurately stopping the drum 2 at the predetermined position.

When the master paper is stopped, it is released from being held by the clamp 10, but since the tip of the master paper is bent into an S shape as described above, it does not come off from the drum 2.

The present invention has the above configuration and uses the pressure of the press roller itself to open the clamper to a state where the master paper can be inserted, so there is no need to provide a separate clamper opening/closing mechanism, and the overall structure is significantly simplified. There is also an effect that the press roller falls into the concave groove of the drum at the stop position of the printing drum, thereby performing the same action of braking and setting the stop position.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an elevational view of the liquid card printing machine with one side plate removed to show the inside;
The figure is an elevational view of the printing press, Figure 3 is a partial side view taken along the line A-A in Figure 2, Figure 4 is an enlarged sectional view of the clutch, and Figure 5 shows the state after the printing drum starts rotating. It is an elevational view of the main part. 2...Printing drum, 6...Press roller, 8...
1st concave groove, 9...2nd concave groove, 10...clamper, 11...protrusion, 12...step portion, 14...spring.

Claims (1)

[Scope of utility model registration request] In a card printing machine comprising a printing drum that starts rotating when printing paper is loaded and stops at a fixed position after one rotation, and a press roller that is in pressure contact with the drum, the press roller falls onto the printing drum at the fixed position. A concave groove and a second concave groove that is shallower than the first concave groove at the rear in the rotational direction are formed, and a clamper is inserted into both the concave grooves, and a protrusion formed on the clamper is inserted into both the concave grooves. The clamper is engaged with the stepped portion between the grooves so as to be able to swing in the radial direction of the printing drum using the stepped portion as a fulcrum, and the clamper is pressed into contact with the second groove by a spring from an appropriate position on the printing drum. At the same time, in the fixed position, the clamper is tilted by the pressure of the press roller against the force of the spring, thereby creating a gap in which the tip of the master paper is inserted between the clamper and the second groove. A clamping device for master paper in a card printing machine, characterized in that it forms a master paper.