JPH0136616Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a printing device that prints the manufacturing date, etc. on a label or the like.

(Prior Art) Conventionally, such printing devices have used photoelectric elements or the like to determine printing timing. That is, the printing paper sent by the paper feeding mechanism is detected by the light receiving element,
In the past, printing was performed at the desired printing timing by transmitting rotation to the printing roller using a clutch whose intermittent control was controlled by the output signal.

(Problem to be solved by the invention) However, this type of printing device requires the transmission of rotation to the printing roller for timing the printing.
Since the cutoff was done by a clutch controlled by a light receiving element, the structure was extremely complex, relatively easy to break down, and had poor maintainability, as well as being complicated to manufacture and inexpensive. There were some problems, such as difficulty.

The present invention was developed by focusing on these points, and by making it possible to set the printing timing without using a complicated mechanism such as a clutch, it provides a printing device that is less likely to malfunction, is easy to manufacture, and is inexpensive. This is what I am trying to do.

(Means for solving the problem) Therefore, in the present invention, a printing device is provided with a paper feeding mechanism that feeds printing paper one sheet at a time, a rotating device coupled to this paper feeding mechanism, and a printing device having a concave groove on the circumferential surface. platen and
A feed roller that rotates in contact with this platen and transports printing paper, a print roller that is supported on the same shaft as this feed roller and rotates independently of this feed roller, and a print roller that rotates independently of this feed roller. Type characters embedded in predetermined positions on the peripheral surface, protrusions that protrude from the outer periphery of the printing roller and loosely fit into the grooves of the platen, and the printing roller has the same outer diameter as the feed roller. a feed rib that is arranged in a headband shape on the peripheral surface and has a cutout in the vicinity of the portion corresponding to the protrusion; a weight that is fixed to the printing roller and biases the center of gravity of the printing roller so that the protrusion is downward; It is composed of an ink supply mechanism that supplies ink.

(Function) In the printing device of the present invention configured as described above,
The print paper fed by the paper feed mechanism pushes against the protrusion of the print roller, bringing the feed rib into contact with the outer periphery of the platen through the print paper, which causes the print roller to rotate and place the desired print paper on the print paper. This is a device that performs printing, and thereby removes a complicated mechanism such as a clutch from the mechanism for determining the printing timing.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway side view of an embodiment of a printing device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -2.

In the drawing, reference numeral 1 denotes a paper feeding mechanism, which separates and feeds out a large number of stacked printing papers 2 one by one from the bottom. A platen 3 is coupled to the rollers of the paper feed mechanism 1 through a chain 4 and rotates therewith. This platen 3 is formed with a groove 5 that goes around the circumferential surface. A feed roller 6 rotates in contact with the circumferential surface of the platen 3. This rotation is transmitted from the platen 3 by gears.

7 is a printing roller, which is supported on the same shaft as the feed roller 6 via a bearing;
It can rotate independently of the feed roller 6. Reference numeral 8 denotes printed characters, which are embedded in predetermined positions on the circumferential surface of the printing roller 7. A weight 9 that biases the center of gravity of the printing roller 7 is fixed to the printing roller 7, and a projection 10 that projects from the outer circumference of the printing roller 7 and fits loosely into the groove 5 of the platen 3 is fixed to the printing roller 7. stands out. Due to the deviation of the center of gravity of the printing roller 7 due to this weight 9,
The protrusion 10 always faces downward. 11
is a feed rib, and the feed roller 6
It has the same outer diameter as , and is arranged in a headband shape on the circumferential surface of the printing roller 7 . This feed rib 1
1 is cut out near the portion corresponding to the protrusion 10, and is configured to come into contact with the circumferential surface of the platen 3 only when the protrusion 10 is pushed and the printing roller 7 rotates by a predetermined angle.

12 and 13 are an ink roller and a transfer roller that constitute an ink supply mechanism. The ink roller 12 is formed of a spongy roller containing a large amount of printing ink. Further, the transfer roller 13 is connected to the feed roller 6 by a gear and rotates together with the feed roller 6, and is in contact with the ink roller 12 and the type 8 embedded in the printing roller 7, so that the ink roller 1
2 printing ink is supplied to the type 8. 1
Reference numeral 4 denotes a light receiving element for detecting the presence or absence of the printing paper 2 on which printing has been completed.

Next, the operation of the printing apparatus configured as described above will be explained.

First, one sheet of printing paper 2 is fed by the paper feeding mechanism 1. This printing paper 2 has a protrusion 1 at the tip.
When it comes into contact with 0, it is pushed and the printing roller 7 moves forward while rotating. The advance of the printing paper 2 is assisted by a feed roller 6. When the printing roller 7 rotates by a predetermined angle, the feed rib 11 comes into contact with the peripheral surface of the platen 3 via the printing paper 2, and then continues to rotate as the platen 3 rotates.

As the printing roller 7 rotates, the ink-applied characters 8 are pressed against predetermined positions on the printing paper 2, and desired characters and the like are printed. When the printing operation is completed, the feed rib 11 of the printing roller 7 separates from the circumferential surface of the platen 3, so that the printing roller 7 stops with the protrusion 10 facing down under the action of the weight 9. Here, the feed rib 11 is designed to prevent contact with the platen 3 even if the printing roller 7 swings somewhat due to inertia due to the notch.

When the printing operation on one sheet of printing paper 2 is completed in this way, the printing device temporarily stops. The printing operation on the next printing paper 2 is restarted by removing the printing paper 2 on which printing has been completed. That is, when the printed printing paper 2 is removed, the light-receiving element 14, which was shielded from light by the printing paper 2, receives light and becomes conductive, thereby triggering the printing device. As a result, the stopped paper feeding mechanism 1 starts operating again, and the above-described process is repeated to perform the printing operation.

Although the present invention has been described in detail above based on the illustrated embodiment, the present invention is not limited thereto, and includes various variations in the paper feeding mechanism, ink supply mechanism, etc., for example. Furthermore, the protrusion of the printing roller does not have to be one that protrudes from the weight, but may be one that projects directly from the printing roller, and this protrusion may also function as a weight.

(Effects of the invention) The present invention is constructed as described above, and the printing paper fed by the paper feeding mechanism pushes the protrusion of the printing roller at the tip of the paper feed mechanism, and the feed rib is applied to the outer peripheral surface of the platen via the printing paper. This makes it possible to remove complicated mechanisms such as clutches from the mechanism for determining printing timing, as the printing roller starts rotating and prints as desired. Therefore, it is possible to provide a printing device that is easy to manufacture, has few failures, and has good maintainability at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of a printing device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -2. 1... Paper feeding mechanism, 2... Printing device, 3... Platen, 5... Concave groove, 6... Feed roller, 7
...Print roller, 8...Type, 9...Weight, 10
... protrusion, 11 ... feed rib, 12 ... ink roller, 13 ... transfer roller.

Claims (1)

[Scope of utility model registration request] A paper feeding mechanism that feeds printing paper one sheet at a time, a platen that rotates in conjunction with this paper feeding mechanism and has a concave groove on its circumference, and a feed roller that rotates in contact with this platen and transports the printing paper. and a printing roller that is rotatably supported on the same shaft as this feed roller and rotates independently of this feed roller.
Types embedded in predetermined positions on the circumferential surface of the printing roller, protrusions protruding from the outer periphery of the printing roller and loosely fitting into the grooves of the platen, and having the same outer diameter as the feed roller. a feed rib arranged in a headband shape on the circumferential surface of the printing roller and having a notch in the vicinity of the portion corresponding to the projection, and a weight fixed to the printing roller to bias the center of gravity of the printing roller so that the projection is located downward. , and an ink supply mechanism that supplies ink to the printed characters.