JPH02196683A - Small-sized printer - Google Patents

Abstract

PURPOSE:To easily observe a printed character by providing a type drum rockable in a digit direction, a cam for fluctuating the type drum, and ink rollers aligned by corresponding a first color to the lower digit part of the type and second, third colors to the upper digit part of the type. CONSTITUTION:An ink roller retainer 17 is inserted with a black ink roller 18, a red ink roller 19, and a green ink roller 20, loosely passed through an ink roller shaft 16, a partition wall 171 is loosely engaged with the groove 151 of a cover 15, thereby positioning the ink rollers 18, 19 and 20 in digit direction. A type drum 3 is moved to an upper digit side by one digit by the engagement of the cam groove 301 with a rotor 12 upon rotation of a stepping motor 2 from its lower digit side. A symbol is disposed at first and second digits of a type sheet 4, and an ink roller 20 is disposed correspondingly to the digit. Accordingly, a printed character becomes green. The third or following digits of the type sheet 4 are numbers to be disposed, and ink rollers 18, 19 are alternately disposed corresponding to the digit. Accordingly the printed character of the number digit is coated differently in black and red colors by the cooperation of the rocking operation of the type drum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a type printer installed in a calculator or the like, and particularly to a type of printer in which ink is applied to type using an ink roller.

[Prior Art] Conventionally, this type of printer was as shown in FIG. 11 of Japanese Patent Application Laid-Open No. 56-137984 or Japanese Patent Application Laid-open No. 57-100089.

[Problems to be Solved by the Invention] In the case of the above-mentioned prior art, as shown in FIG. 13, the printed characters are printed in black in normal printing, and in order to display negative numbers, the lines for negative numbers are Measures such as printing in red were used to make it easy to distinguish between positive and negative numbers. This point is made to be very easy to read, but as shown in Figure 13, the numbers and the symbols in the lower digits are generally the same color, so be careful when making this distinction. It was tiring to have to read it.

The present invention has been made to solve this drawback, and an object thereof is to provide a printer that can distinguish numbers and symbols, and integers and negative numbers by different colors, making printed characters very easy to see.

[Means for Solving the Problems 1] The small printer of the present invention comprises a type drum having type characters disposed on its outer periphery and rotatable and swingable in the digit direction, and integrally formed coaxially with the type drum. A cam that swings the type drum, and ink in which a first color is applied to the lower digit part of the type character, and a second color and a third color are arranged in parallel to each other in the upper digit part. It is characterized by being provided with a roller.

[Function] According to the above configuration of the present invention, the lower digit part is printed in the first color, and the upper digit part is selectively painted in the second color and the third color. The type drum is made to oscillate, with ink rollers of second and third colors corresponding to each type of type.

[Embodiment] FIG. 1, FIG. 2, and FIG. 3 are an exploded perspective view, a plan sectional view, and a side sectional view, respectively, in an embodiment of the present invention.

1 is a frame, which is provided with holes 101 and 102. Reference numeral 2 denotes a step motor, which is provided with ratchet teeth 201 and ratchet teeth 202 corresponding to the phases of each type on its outer periphery. 3
is a type drum, with a cam 301, a groove 302 . Protrusion 3
031 Paper feed drive gear 304, reset signal cam 305
is integrally molded, and a through hole 306 is provided on the outer periphery.

4 is a type sheet, which has type characters 401 on the front side and protrusions 402 corresponding to the type characters 401 on the back side, and is wound around the type drum 3 by inserting the protrusions 402 into the through holes 306. There is. 5 and 6 are yokes forming yokes for the electromagnet, 7
is the iron core fixed to yoke 6, and 8 is 1 for the second digit of type 401.
9 is a hammer that is slidably set inside the coil 8, and 10 is located inside the coil 8 and moves almost integrally with the hammer 9. When the coil 8 is energized, it is generated by an attractive force. This is a suction plate that is attracted to the iron core 7. One end 501 of the yoke 5 passes through the step motor 2, and the one end 501
02 passes through the bearing 11. The bearing 11 pivotally supports the type drum 3 , and the protrusion 303 of the type drum 3 engages with the stepper motor 2 201 . Yoke 5 has hole 503.50
4 and is positioned and fixed to the frame l. The step motor 2 and the bearing 11 cannot swing in the digit direction, but the type drum 3 can swing in the digit direction. A rotor 12 is pivotally supported in a hole lO1 of the frame l, engages with a cam 301 of the type drum 3, and swings the type drum 3 in the direction of one digit per rotation. 13 is a first detection spring, and 14 is a second detection spring. The curved portion 131 of the first detection spring 13 is connected to the reset signal cam 305 of the type drum 3.
When the first detection spring 13 and the second detection spring 14 come into contact with each other, a set signal that rotates once every two revolutions of the type drum 3 is generated. Reference numeral 15 denotes an ink roller cover, which supports the ink roller shaft 16 . The ink roller receiver 17 has a black ink roller 1B and a red ink roller 19.
Or, insert the green ink roller 20 and insert the ink roller shaft 1.
The partition wall portion 171 is loosely fitted into the groove 151 of the ink roller cover 15, and the ink roller 18.
Positioning in the direction of the digits 19 and 20 is performed. 32
is a paper feed shaft, which passes through the paper feed rubber 21 and connects to the frame l.
It is pivotally supported by a platen 22 attached to. 23
6 is a paper feed gear, which is coaxially supported on the platen 22 with the paper feed shaft 32, and is pressed against the paper feed shaft 32 side by the paper feed spring 24 attached to the frame 1. The paper pressing roller 25 engages with the feed shaft 32 by forming a one-way clutch with triangular teeth, and the paper feed gear 23 reliably drives the paper feed shaft 32 during rotation in the paper feed direction. is inserted into a paper presser shaft 26 supported by the frame l, and the printed paper 31 is pressed against the paper feed rubber 21 by the spring force of the paper presser shaft 26. 2
Reference numeral 7 designates a reversing stopper claw attached to the frame l, which serves as a contact point for the ratchet teeth 202 of the step motor 2.
The type 401 is stopped at the printing position 28. Reference numeral 29 denotes an ink roller frame, which swings integrally with the type drum 3 along the full length 102 of the frame 1 when the protrusion 291 engages with the groove 302 of the type drum 3. 30 is an ink roller spring that presses the ink rollers 18, 19 and 20 against the type drum 3 side.

In this embodiment, two revolutions of the type drum 3 constitute a printing cycle for one line, as shown in FIG. It consists of 5 strokes. type drum 3
The rotation and stopping of the step motor 2 is performed by controlling the energization of the step motor 2, but a detailed explanation of this energization control method will be omitted.

In the first stroke, the type drum 3 moves as shown in FIG.
The hammer 9 is located closer to the step motor 2, that is, closer to the lower digit, and the positional relationship between the hammer 9 and the type 401 is as shown in FIG. Note that one hammer 9 is responsible for printing two digits of type 401. When the step motor 2 is energized and rotated in the direction of the arrow, the printing position 28
Printed characters 401 are located sequentially. When a desired type character 401 of a desired color faces the printing position 28, the step motor 2 is controlled and the type drum 3 is stopped. At this time, in order to stop the type drum 3 accurately and quickly, it is sufficient to energize the step motor 2 to reverse the rotation (in the direction of arrow B) and cause the ratchet teeth 202 to engage the reverse stopper pawl 27. 3, the coil 8 of the desired digit is energized to attract the suction plate 10, and the hammer 9 is operated to remove the printed characters 401.
is pressed against the printing paper 31 to perform printing.After cutting off the current supply to the coil 8, the step motor 2 is rotated again in the direction indicated by the arrow. Repeat the same motion for each desired type, repeating the first
Finish the journey.

The second stroke is a stroke in which the type drum 3 moves from the lower digit side to the higher digit side. As the step motor 2 rotates, the cam groove 301 and the rotor 12 engage with each other, causing the type drum 3 to
moves one digit to the upper digit side.

In the third stroke, the type drum 3 is located on the upper digit side, and the positional relationship between the hammer 9 and the type 401 is as shown in FIG. In this positional relationship, the same operation as in the first step is repeated to print desired characters. Also, at the beginning of the third stroke, the paper feed drive gear 304 of the type drum 3 rotates to an angle where it meshes with the paper feed gear 23, but the position of the paper sanding drive gear 304 and the paper feed gear 23 in the digit direction is Relationship is the 8th
As shown in the figure and FIG. 10, the paper feed gear 23 does not rotate because it is out of mesh, and therefore paper feed is not performed. Also, at this time, the reset signal cam 305 of the type drum 3 The first detection spring 13 rotates to an angle that pushes up the curved portion 131, but the positional relationship between the reset signal cam 305 and the first detection spring 13 in the digit direction is such that they cannot engage, as shown in FIG. Therefore, the first detection spring 13
The curved portion 131 is not pushed up, and therefore no reset signal is generated.

The fourth stroke is a stroke in which the type drum 3 moves from the upper digit side to the lower digit side. As the step motor 2 rotates, the cam groove 301 and the rotor 12 engage with each other, causing the type drum 3 to
moves to the lower digit of the 1st digit.

The fifth step is a paper feeding step. In this process, the type drum 3 is located on the lower digit side as shown in FIG.
As shown in the figure and FIG. 9, meshing is possible. Further, the positional relationship in the digit direction between the reset signal cam 305 and the first detection spring 13 is such that they can engage with each other as shown in FIG. As the type drum 3 rotates, the paper feed drive gear 30
4 and the paper feed gear 23 mesh with each other, the paper feed gear 23 rotates by a predetermined amount, and the paper is fed by one line. Also, during this paper feed, the reset signal cam 405 is activated by the first detection spring 13. The curved portion 131 is pushed up, the first detection spring 13 and the second detection spring 14 come into contact, and a reset signal is generated. After detecting this reset signal, the step motor 2
is stopped, and the printing cycle for one line is completed.

Here, the printed characters will be explained.

In this embodiment, the symbols are arranged at the 1st and 2nd digits of the type sheet 4, and the ink rollers 20 are arranged correspondingly to those digits, so the printed characters are green. In addition, numbers are placed after the third digit on the type sheet 4, and corresponding to that digit,
Since the ink rollers 18 and 19 are arranged alternately, the characters printed with numerical digits are colored separately in black and red by cooperation with the swinging motion of the type drum. The sample of characters printed in this state is printed with the positive and negative numbers colored in red and black, as shown in Figure 14, and the symbols are printed as follows:
Since it is printed in green, it is very easy to read.

During the entire stroke, the ink rollers 18 , 19 , 20 together with the ink roller frame 29 swing together with the type drum 3 and supply ink to the type 401 . As shown in FIG. 2, since the outer diameter of the partition wall 171 of the ink roller receiver 17 is larger than the outer diameter of the ink rollers 18 and 19, the ink of the black ink roller 18 and the ink of the red ink roller 19 or the green ink roller 20 The colors will not mix.

Further, the ink roller receiver 17 is loosely inserted into the ink roller shaft 16, and the partition wall portion 171 thereof is connected to the ink roller cover 1.
5 full 151&,: loosely fitted, ink roller 18.19
．． Since positioning is performed in the direction of 20 digits, the total number of
By ensuring the dimensional accuracy of 1, it is possible to easily ensure the positional accuracy of the ink rollers 18, 19, and 20 in the digit direction with respect to the type 401.

In this embodiment, printing is performed in three colors, black, red, and green, but any color may be used in any arrangement, or three or more colors may be used as required.

In one embodiment, the cam groove 301. Type drum 3, paper feed drive gear 304, and reset signal cam 3
05 are all integrally molded, but these may be molded separately and then integrated by any method.

Furthermore, in this embodiment, a grooved cam (a mechanism using a cam groove 301 and a rotor 12) is used as the cam for swinging the type drum 3, but other types of cam mechanisms may be used if the same operation can be obtained. may also be used.

[Effect of the invention 1 As described above, according to the present invention, the symbol digits, positive numbers, and negative numbers can be colored separately in three colors, making it possible to understand printed characters at a glance. A small, easy-to-read printer can be provided.

Furthermore, since the above-mentioned effects can be achieved with a book ink roller, it can be provided at a low cost.

[Brief explanation of the drawing]

1 to 12 are diagrams showing embodiments of the present invention, and FIG. 1 is an exploded perspective view. Figure 2 is a plan sectional view. Figure 3 is a side sectional view. FIG. 4 is a diagram showing the positional relationship between the printing type and the hammer in the digit direction in the first stroke and the fifth stroke. FIG. 5 is a diagram showing the positional relationship between the type and the hammer in the digit direction in the third stroke. FIG. 6 is a timing diagram of a one-line printing cycle. FIG. 7 is a perspective view showing the positional relationship in the digit direction between the paper feed drive gear and the paper feed gear in the first stroke and the fifth stroke. FIG. 8 is a perspective view showing the positional relationship in the digit direction between the paper feed drive gear and the paper feed gear in the third stroke. FIG. 9 is a plan cross-sectional view showing the positional relationship in the digit direction between the paper feed drive gear and the paper feed gear in the first stroke and the fifth stroke. Fig. 10 is a plan sectional view showing the positional relationship in the digit direction between the paper feed drive gear and the paper feed gear in the third stroke, and Fig. 11 is a plan sectional view showing the positional relationship in the digit direction between the reset signal cam and the detection spring in the third stroke. A diagram showing a positional relationship. Fig. 12 is a diagram showing the positional relationship in the digit direction between the reset signal cam and the detection spring in the fifth stroke, Fig. 13 is a diagram showing the state printed using a conventional small printer, and Fig. 14 is a diagram showing the state of printing using a conventional small printer. FIG. 3 is a diagram showing a state of printing using the small printer according to the invention. 1 ・ 2 ・ 3 ・ 4 ・ 5゜7 ・ 8 ・ 9 ・ 10 ・ 11 ・ l 2 ・ l 3 ・Frame, step motor, type drum, type sheet, yoke, iron core, coil, hammer, suction plate, bearing -Rotor/first detection spring l4, l5, 16, l7, l8, l9, 20, 2l, 22, 23, 24, 25, 26, 27, 28, 29, 30, 3l・ 32 ・ ・Second detection spring, ink roller cover, ink roller shaft, ink roller receiver, black ink roller, red ink roller, green ink roller, paper feed rubber, platen, paper feed gear, paper feed flap, paper presser Roller, paper press shaft, reverse stopper claw, printing position, ink roller frame, ink roller spring, printing paper, paper feed shaft Fig. 3 Fig. 4 Fig. 5 5× 0: 0 ratio diagram

Claims (1)

[Claims] A type drum having type arranged on its outer periphery and rotatable and swingable in the digit direction, a cam that engages with the type drum and swings the type drum, and a first cam in the lower digit part of the type. A small printer characterized in that it is provided with ink rollers arranged in parallel with each other, a second color and a third color in the upper digit part corresponding to the respective printed characters.