JPH0420790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device suitable for implementation in a printing machine such as a time stamp, which prints by applying pressure to inserted printing paper.

Conventional printing devices that print using type include:
Pressure printing is performed by rotating a printing wheel with a large number of letters formed on its circumference and applying pressure to the printing paper, or by rotating a printing roller and platen to press the printing paper against the printing wheel. There is a pressure printing method and a stamping method in which printing is performed by hitting a printing hammer against the type wheel using a solenoid.However, while the pressure printing method produces quieter printing, it is dependent on the paper quality and thickness of the printing paper. ,
If the number of sheets changes, it often becomes impossible to print clearly, and especially in the case of the printing roller pressure method, the structure is very complicated and expensive.On the other hand, the printing method using a solenoid has problems. In some cases, even though powerful stamping can always produce uniform and clear printing regardless of changes in the printing paper, the printing machine's mechanical The problem was that strength and vibration resistance were required, which made the structure more complex.

The present invention has been developed in view of the above-mentioned points, and its purpose is to achieve each of the advantages of the pressure printing method and the stamping method, namely, the printing sound is quiet, there is little impact, and In addition, it is a printing method that has been devised so that it can always produce uniform and clear printing despite changes in the quality of printing paper, the number of sheets, etc., and it also has the advantage of being simple in structure and easy to manufacture. In order to achieve the above-mentioned object, the present invention provides a pressurized vibration printing device for machines, and in order to achieve the above-mentioned object, when the type presses the printing paper, the platen receiving this pressure is slightly vibrated by an electromagnetic vibration device. It is configured to be vibrated so that clear printing can be performed by the pressurization and slight vibrations.

Next, a preferred embodiment of the printing device according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 are a partially sectional side view and an enlarged front sectional view showing an example of a time stamp in which a printing device according to the present invention is implemented, and in these drawings, 10 is a lower case. , 11 is an upper case attached to the upper surface of the lower case 10 in an open state, 12 is a type mounting frame whose intermediate part is rotatably supported inside the upper case 11 by means of a mounting shaft 13, and 14 is this mounting frame. The type shaft 12 is installed between the tips of the type shaft 12, and 15... indicates a plurality of type wheels attached to the type shaft 14 side by side. Reference numeral 16 denotes a traction spring that pulls and rotates the entire type mounting frame 12, including the type wheels 15, around the mounting shaft 13 as a fulcrum, and constantly holds the type wheels 15 in the upper position shown in FIGS. 1 and 2. Reference numeral 17 indicates an interlocking lever connected to the end of the type mounting frame 12. Reference numeral 18 denotes a type actuating device such as a toggle mechanism installed inside the lower case 10. This actuating device 18 is inserted in the direction of arrow X in FIG. 1 along the guide plate 10a laid on the upper surface of the lower case 10. When the tip of the printed printing paper TC (see Fig. 5) presses the actuator SW of the actuator start switch to turn on the switch, the drive starts and the interlocking lever 17 is pushed up as shown by the arrow Y in Fig. 1. In addition, the above-mentioned type mounting frame 12
As the interlocking lever 17 moves upward, the mounting shaft 1
The traction spring 16 is rotated counterclockwise in FIG. 1 while extending the traction spring 16 around 3, and printing is performed by pressing the type ring 15 against the printing paper TC as shown by the imaginary line in the figure. . Note that as the actuating device 18, a toggle mechanism constructed by a combination of a gear reduction mechanism operated using a motor as a drive source and a cam mechanism is usually used, but this is just one example of implementation.

In FIGS. 1 to 5, 20 is a platen that receives pressurized printing from the type wheel 15 with printing paper TC interposed therebetween;
This is a printing stand with a Further, reference numeral 22 denotes a support stand formed in a generally upward U-shape, and left and right brackets 2 are attached to the left and right upper ends of this support stand 22.
2a, 22a are arranged in series, both brackets 22a,
The inner facing interval 22a1 of 22a corresponds to the printing table 21.
The inset spacing is . 23, 23 are guide pins vertically installed on the left and right bottom surfaces of the printing table 21, and on the left and right sides of the bottom frame portion 22b of the support table 22, there are two left and right guide/adjustment screws facing the left and right guide pins 23, 23. 24, 24 are protruded so as to be able to be screwed and adjusted freely, and these are inserted between the upper and lower guide pins 23 and the screws 24, specifically between the bottom of the printing table 21 on which the guide pins 23 are vertically disposed, and the screws 24. Screwed round nut 2
4a, the printing stand 21 positioned within the facing interval 22a1 is elastically supported horizontally with respect to the support stand 22.

Reference numerals 26 and 26 denote left and right support bolts for attaching the entire support base 22, which elastically supports the printing base 21 as described above, inside the lower case 10 below the type ring 15, and the bolts extend upward through the bottom plate of the lower case 10. The threaded end portion 26a of each protruding support bolt 26 is inserted into a threaded hole 22a penetrating the bracket 22a of the support stand 22.
2 are screwed into each. 27, 27 are support springs wound around both the support bolts 26, 26, and each spring 27 is attached to the bracket 22.
a and the bottom plate of the lower case 10, and the entire support stand 22 including the printing stand 21 is attached to the lower case 10.
Moreover, the platen 20 is elastically supported so as to face the type wheels 15 while being slightly lifted from the bottom plate.

Incidentally, the elastic force of the resilient springs 25, 25 that elastically support the printing table 21 and the horizontal state of the printing table 21 are as follows.
It can be adjusted as appropriate by screwing the guide/adjustment screws 24, 24, and the elastic support force of the left and right support springs 27, 27 that elastically support the support base 22, and the height and level of the support base 22 itself can be adjusted as appropriate. The state can be adjusted as appropriate by screwing the support bolts 26, 26.

Next, what is generally indicated by the reference numeral 30 is an electromagnetic vibration device mounted on the bottom frame portion 22b of the support base 22, and this electromagnetic vibration device 30 applies the printing paper TC when the type wheel 15 descends. When pressed, the printing base 21
The platen 20 on the upper surface, which actually receives pressurization, can be vibrated finely in the same way.

What is shown in FIGS. 1, 2, and 4 shows the specific structure of the electromagnetic vibration device 30, and in the figures, 31 is a magnetic plate attached to the bottom of the printing stand 21. For example, it is made of a strong magnetic material such as silicon laminated steel plate. 32 is the support stand 2
The electromagnetic vibration device 30 described above is constructed by winding an electromagnetic coil 33 around one leg of the fixed core 32, which is attached to the bottom frame portion 22b of the fixed core 32.

FIG. 6 is a block diagram briefly explaining the power supply circuit of the electromagnetic vibration device 30. In the figure, reference numeral 40 indicates a switch piece 40a on the lowering rotation path of the type support frame 12 as shown in FIGS. 1 and 2. There is a protruding normally open type micro switch, and 41 is a voltage regulator connected in series to this switch 40. The voltage regulator 41 includes a variable resistor 41a that can freely adjust the voltage high or low using a knob (not shown). Further, 42 is an oscillation circuit for the electromagnetic coil 33 connected in series to the voltage regulator 41. According to the above-mentioned configuration, the type support frame 12 rotates downward and the type wheel 15 is applied to the printing paper TC. When pressed, the micro switch 40 turns on and the power supply circuit is closed.
The electromagnetic vibration device 30 causes the magnetic plate 31 to repulsively vibrate, thereby slightly vibrating the printing stand 21 which is elastically supported by the resilient springs 25, 25, thereby causing the platen attached to the upper surface of the printing stand 21 to vibrate. 20, type wheel 1
5 can vibrate slightly while being pressed against the bottom side of the pressurized printing paper TC.

In addition, in FIG. 3, 28... is an electromagnetic vibration device 30.
This is a horizontal vibration prevention piece that prevents horizontal vibration of the printing table 21 caused by vibration.

Since the printing device according to the present invention has the configuration as described above, when the printing paper TC is inserted along the guide plate 10a in the direction of the arrow X in FIG. is driven to rotate the type mounting frame 12 about the mounting shaft 13 as a fulcrum, and press the type wheel 15 against the printing paper TC. At the same time as this pressing, the type mounting frame 12 moves to the vibrating device 3.
Since the micro switch 40 of 0 is pressed and closed,
The electromagnetic vibration device 30 repulsively vibrates the magnetic plate 31, and vibrates slightly while pressing the printing base 21, that is, the platen 20, against the bottom side of the printing paper TC. Due to the slight vibration of the platen 20, clear printing can be performed on the printing paper TC.

Further, the electromagnetic oscillation device 30 includes a voltage regulator 41
By adjusting the voltage by operating the variable resistor 41a, the vibration pressure of the platen 20 can be adjusted freely, so changes in the quality of printing paper TC, the number of sheets, etc. can be fully coped with, and clear printing can be performed. be able to.

Furthermore, a support stand 22 to which the above-mentioned printing stand 21 is attached
Since the printing plate 21 is mounted inside the lower case 10 while being elastically supported by the support springs 27, 27, the vibrations of the printing table 21 are absorbed by these support springs 27, 27.
can prevent the lower case 10 from vibrating during printing.

After printing is completed, the actuating device 18 and the traction spring 16 reversely rotate the type mounting frame 12 to raise the type wheel 15 to its original position, and at the same time, the micro switch 40 is turned off and the vibration device 30 is activated. Stop and prepare for the next printing.

The printing device according to the present invention is as described above, and at the same time when the type presses the print paper, the platen that receives this pressure vibrates and slightly vibrates the print paper. Compared to the conventional pressure printing method, which prints only by applying pressure from a pressure roller and platen, it is possible to obtain even and uniform printing pressure, and therefore always performs uniform and clear printing. be able to. In addition, if you want to change the quality or thickness of the printing paper, or the number of sheets to be printed, you can easily handle this by simply controlling the strength of the elastic force of the elastic spring using the vibration pressure of the platen as a guide and adjustment screw. In addition, it is economical because it can print quietly with little printing noise, there is almost no shock or vibration during printing, and the overall structure of the printing machine can be configured simply. Coupled with the fact that it has a simple configuration and is easy to implement, it is suitable for use in a printing machine such as the illustrated time stamp or a time recorder.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an example of a time stamp implemented with a printing device according to the present invention;
The figure is an enlarged sectional view taken along line A-A in Figure 1, Figure 3 is an exploded perspective view of the main parts, Figure 4 is a plan view of the assembled main parts, and Figure 5 is a front cross-section with some of the main parts omitted. 6 are block diagrams simply showing the power supply circuit of the electromagnetic vibration device. 10...Lower case, 11...Upper case, 12...
... Type mounting frame, 15... Type wheel, 18... Actuating device for type, 20... Platen, 21... Printing stand, 22... Supporting stand, 24... Guide and adjustment screw, 25... Printing stand An elastic spring that supported the
27... Support spring, 30... Electromagnetic vibration device, 31... Magnetic plate, 40... Micro switch for operating the electromagnetic vibration device, TC... Printing paper.

Claims (1)

[Claims] 1. In a printing device equipped with a type actuating device that prints on the printing paper by pressurizing and rotating the type toward the printing paper inserted between the type and the platen, the bottom of the printing device is moved by a spring. a support stand elastically supported inside the case; a printing stand elastically supported on the support stand by an elastic spring so as to be able to freely vibrate; the above-mentioned platen is attached to the top surface; and a magnetic plate is attached to the bottom surface; an adjustment screw for adjusting the spring pressure of the elastic spring; a switch means for detecting pressurized rotation of the type; and an electromagnetic device provided on the support base for repulsively vibrating the magnetic plate in response to the detection output of the switch means. A printing device comprising: an electromagnetic vibration device that slightly vibrates the printing stand by generating force.