JPH05372Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a printing device for a check writer which performs printing by pressing a type ring in which a plurality of concave and convex carved type characters are arranged at a predetermined pitch in the circumferential direction against a printing stand. (Prior Art) Conventionally, this type of printing device has a type ring in which a plurality of types are arranged at a predetermined pitch in the circumferential direction on the circumferential surface of a ring-shaped type ring base, and this type surface is arranged on a printing paper. After contacting the printing stand via the printing plate, the printing load is obtained by pressing it further. In order to do this, the printing stroke of the type wheel is set to be larger than the distance between the type surface and the printing stand. (Problems to be Solved by the Invention) However, in this conventional technique, assuming that the printing load is constant, the printing pressure caused by this will vary depending on the contact area of each type. That is, P=F/S P: printing pressure, F: printing load, S: contact area, and when the printing load F is constant, the smaller the contact area S, the higher the printing pressure P.
This causes problems such as the print becomes unclear due to the type, and the print paper is torn. To solve this problem, some hammer printers adjust the percussion spring force according to each character or control the current value of the percussion solenoid. This method cannot be applied to devices that perform printing due to structural differences. By the way, in a check writer printing device that prints by pressing type against a printing stand, in order to make the printing load F variable, it is necessary to make the printing stroke variable corresponding to each type, and this requires lowering the type wheel. Since the cam used as the actuating means for the printing must be changed for each type, there is a problem in that the number of parts increases and the mechanism becomes complicated. Therefore, the present invention was devised to solve the above-mentioned problems of the conventional example, and its purpose is to simplify the configuration of a check writer printing device that prints by pressing type against a printing stand. At the same time, the objective is to make the print density, print clarity, etc. uniform. (Means for Solving the Problems) In order to achieve the above object, in the present invention, a type ring in which a plurality of uneven carved type characters are arranged at a predetermined pitch in the circumferential direction is pressed against a printing base. In a printing device for a check writer that performs printing, the printing stroke of the type wheel is kept constant, and the character height of a plurality of types arranged on the type wheel is adjusted to the contact area of each type with the printing base. It is configured by setting different heights based on the height. (Function) In the present invention having the above configuration, the printing stroke of the type wheel is made constant, and the character height of a plurality of types arranged on the type wheel is adjusted to the contact area of each type with the printing base. By setting the heights to be different based on the height, the amount of insertion of the type into the printing stand is adjusted and the printing pressure is kept constant. (Example) The present invention will be explained below based on the illustrated example. FIG. 1 shows a check writer equipped with an embodiment of the printing device according to the present invention. In the same figure, 1 is the main frame of the check writer;
The frame 1 includes an input section 2 consisting of numerical keys for the amount to be printed, function keys such as an issue key, a memory key, etc., a display section 3 for displaying input numerical values, and a printing section housing a serial printer. 4 and a gap 5 for inserting paper such as checks and receipts.
It is equipped with. Then, paper P such as a check or receipt is placed in the gap 5.
After entering print data such as the amount from the input section 2 while the printer is inserted into the printer, confirm this on the display section 3, and then press the issue key to command the start of printing.
Accordingly, printing is performed on the paper P one digit at a time. Note that the paper P is fed in the direction of the digit indicated by the arrow every time one digit is printed. FIG. 2 is a side view showing in detail the internal structure of the printing unit 4 shown in FIG. The fixed frame 8 is a swinging frame. One end of the swing frame 8 is swingably supported by one end of the fixed frame 7 via a support shaft 9. The swinging frame 8 is equipped with a motor 10, a driving force transmission means 11 comprising a plurality of gears, and a type wheel 12 from its base end toward its free end. As shown in FIGS. 3a and 3b, the type ring 12 is provided with currency unit marks "¥", comma ",", and numeral "0" at predetermined pitches in the circumferential direction on the circumferential surface of a ring-shaped type wheel base 12a. ~9'', an end mark ``*'' to prevent tampering, etc., are arranged in printed letters 12b.
The type ring base 12a and the type 12b are integrally formed of a plastic material, particularly an engineering plastic having excellent impact resistance, abrasion resistance, and dimensional stability. As this engineering plastic, it is preferable to use PES (polyether sulfone) from the viewpoints of impact resistance, abrasion resistance, dimensional stability, etc. Embosses (irregularities) 12c are formed on the surface of the type 12b, as shown in FIGS. 3c and 3d, in order to mark the printed characters on the paper. A printing stand 14 is disposed directly below the type ring 12 and exposed through the window hole 13 of the horizontal substrate 6 so as to face the type 12b of the type ring 12. As shown in FIG. 4, the pressed portion 14a pressed by the type 12b portion of the printing stand 14 is made of an elastic material (about 1 mm thick) with high mechanical strength such as urethane rubber. and
It is fixed with an adhesive within the upper surface recess 14c of the aluminum base 14b. Further, the surface of the pressed portion 14a is generally formed into a flat surface. The rotation of the motor 10 is transmitted from a gear 15 provided on the drive shaft of the motor 10 to the type wheel 12 via gears 17, 18, 19, and 20 of the drive force transmission means 11. The rotational force is transmitted from the gear 20 to the type wheel 12 by friction transmission, and the gear 20 is transferred only when the locking lever 22 is disengaged from the ratchet wheel 21 provided integrally with the type wheel 12. The rotation is transmitted to the type wheel 12, and when the locking lever 22 is engaged with the ratchet wheel 21, the gear 20 slips and rotates with respect to the type wheel 12. Furthermore, the rotation of the motor 10 rotates a cam member 23 provided coaxially with the gear 19, and the cam member 23 and a cam floor 24 provided on the fixed frame 7 cooperate to cause the swing frame 8 to swing. The type wheel 12 is moved by the swinging of the swinging frame 8.
is lowered and pressed against the printing stand 14 to perform a printing operation. Further, the marking stand 14 is attached to a support shaft 28 at an approximately intermediate portion of a holding member 27 which is located below the horizontal board 6 and is swingably attached to the fixed frame 7 by a support shaft 26.
It is installed through. A screw shaft 29 screwed into the lower surface of the horizontal substrate 6 is provided at the free end of the holding member 27, and the height of the marking stand 14 can be adjusted by adjusting the screwing amount of the screw shaft 29. I can do it. Note that 30 in FIG. 2 is an ink roller that supplies ink to the type wheel 12. In this embodiment having the above configuration, the printing operation is performed as follows. That is, motor 1
0 rotates the type wheel 12 to select a type, and then the locking lever 22 engages the ratchet wheel 21 to stop the rotation of the type wheel 12. Thereafter, the cam member 23 is rotated by the rotation of the motor 10, and in cooperation with the cam floor 24, the swinging frame 8 is swung to lower the type wheel 12 and press it against the printing base 14. Thereby, printing is performed on the paper P fed between the type ring 12 and the printing stand 14. In this embodiment, the type ring 12 installed at the free end of the swinging frame 8 is made of plastic material and is lightweight, so the load on the swinging frame 8 is small. It is possible to reduce the plate thickness of the swing frame 8 and to simplify the portion that supports the swing frame 8, making it possible to reduce the weight of the entire device. Furthermore, since the type ring 12 is made of a plastic material, there is no variation in dimensions, which makes it easy to control dimensions, and it is also easy to process, thereby reducing costs. Furthermore, even if the type ring 12 is made of plastic, the pressed portion 14a of the stamp stand 14 that receives it is made of an elastic material such as urethane rubber, so the surface of the type ring 12 does not need to be plated with metal. Therefore, not only can processing costs be reduced, but also problems such as the size of the type ring 12 being out of order, the printing quality being uneven, and notches being insufficiently formed do not occur. . Further, even if the relative mounting positions of the type ring 12 and the printing stand 14 are shifted, the print clarity will not be reduced. Furthermore, since the pressed portion 14a is firmly fixed to the base portion 14b with adhesive, when the type 12b presses the pressed portion 14a,
The area around the pressed area is not raised unnecessarily, and therefore the paper P can be prevented from becoming dirty or torn. By the way, in this embodiment, as shown in FIG. 2, the rotation of the motor 10 rotates the cam member 23 provided coaxially with the gear 19, and the cam member 23 and the cam floor 24 provided on the fixed frame 7 rotate. By swinging the swinging frame 8 by the action, the type wheel 12 is lowered and pressed against the printing stand 14 to perform a printing operation. That is, in this embodiment, after the type face of the type wheel 12 contacts the printing stand 14 via the paper P, the printing load is obtained by further pressing the type surface even more.
This is the stroke of the type wheel 12 between the type face and the printing base 1.
This is because the interval is set larger than that of 4. Furthermore, in the above configuration, this embodiment sets the printing stroke of the type wheel 12 to be constant using one cam member 23, and also adjusts the character height of the plurality of type characters 12b arranged on the type wheel 12. By setting the heights to be different based on the respective contact areas to the stamp stand 14, the printed characters 12 on the stamp stand 14 are
The amount of penetration of b is adjusted to keep the printing pressure constant. To explain this specifically, the distance from the center point O of the type ring 12 to the type surface 12d is defined as the character height h. The contact areas of the monetary unit mark "¥", comma ",", numbers "0 to 9", and tamper-proof end mark "*" are as shown in Table 1 in the embodiment.

【table】

[Table] In Table 1, the numbers “2, 3, 4, 5, 6,
9", the monetary unit mark "¥", and the tamper-proof end mark "*", the average value of the contact area S of 4.6 (mm ² ) is taken as 1, and the ratio of each type is shown as the numbers "1" and "7". ,
The area ratio of the comma "," is approximately 3/4, 3/4, and 1/4, respectively. A graph of this is shown in Figure 5, in which the horizontal axis represents the characters, the vertical axis represents the contact area, and the standard value on this vertical axis is the above average value.
It is 4.6 (mm ² ). That is, as shown in the graph of FIG. 5, the contact area S of the comma "," shown in FIG. 3e is significantly smaller than that of the other printed characters 12b. If this comma "," is subjected to a printing load F similar to that of the other printed characters 12b, the printing pressure P will become strong, and the printing may become too dark or the paper P may tear. Therefore, in this embodiment, for type characters with a small contact area S such as a comma ",", the height h of the type from the type surface 12d is set low, and the amount of penetration of the type 12b into the pressed portion 14a of the printing base 14 is reduced. The purpose is to reduce the printing load F and, as a result, make the printing pressure P the same as that of other characters. This is shown in Table 2.

[Table] According to Table 2, by making the character height variable depending on the type of type, the amount of penetration into the pressed portion 14a differs, and the printing pressure P is made uniform. Therefore, it is no longer necessary to change the printing stroke for each character, and it is sufficient to set the printing stroke constant using one cam member 23. In the above Table 2, the character height h is grouped into three levels, but based on Table 1 and Figure 5, the characters "08", "2345689 ¥*", "17", and "," You can also group into four levels. (Effect of the invention) The printing device of the check writer according to the invention has the above-mentioned configuration and operation, and the printing stroke of the type wheel is constant, and the character height of the plurality of characters arranged on the type wheel is fixed. By setting different heights based on the contact area of each type with the printing stand, the printing pressure becomes constant, which simplifies the mechanism and eliminates the need for control corresponding to each type.
It is possible to perform clear printing with uniform density, and there is an effect that there is no damage to the paper.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a check writer equipped with a printing device according to the present invention, Figure 2 is a side view showing an embodiment of the present invention, Figure 3a is a side view of a type wheel, and Figure 3b is a side view of a type wheel. Front view with partial cutaway, c and d of the same figure
are a surface view and a cross-sectional view of a type, respectively, FIG. Explanation of symbols, 4... Printing section, 12... Type wheel,
12a... Type wheel base, 12b... Type, 12d
...Print surface, 14...Print stand, 14a...Pressed portion.

Claims (1)

[Scope of utility model registration request] In a check writer printing device that performs printing by pressing a type wheel in which a plurality of concave and convex carved type characters are arranged at a predetermined pitch in the circumferential direction against a printing stand, the printing stroke of the type wheel is made constant, and the type wheel is 1. A printing device for a check writer, characterized in that character heights of a plurality of characters arranged in a row are set to different heights based on respective contact areas of the characters with the printing stand.