JPS5913988B2 - line printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a line printer, in particular, rotates a type drum on which a plurality of type characters are arranged on the outer circumferential surface, and when a desired type character of the corresponding 0 digit comes to a predetermined position, it is printed on a recording medium. The present invention relates to improvements in line printers that perform desired recording operations.

Line printers are widely used as input/output devices for computers or other information processing devices.

5. In this type of printer, in order to increase the types of characters, numbers, symbols, etc. to be recorded, that is, to increase the printing capacity, it is necessary to increase the diameter of the type drum and increase its outer peripheral area.

However, this usually means increasing the volume of the printer section of the terminal or information processing device, and decreasing the printer's startup characteristics and reducing power consumption due to an increase in the moment of inertia of the type drum. The disadvantages were an increase in the amount of electricity and prices. Also, in order to downsize,
Reduce the diameter of the type drum! 5, the printing capacity had to be reduced in proportion to the diameter of the type drum. The present invention has been made in view of the above-mentioned conventional problems, and its object is to arrange a group of left-handed and right-handed characters in a multi-spiral pattern on the outer peripheral surface of a type drum. A common type of each of the type groups is provided on the intersection with the type group, and the common type is recorded on the recording medium in both the forward and backward movement of the type drum which rotates and reciprocates. It is characterized by its large printing capacity, compact size, and high-speed recording.

An embodiment of the present invention will be explained below based on the drawings.

FIG. 1 is a partially exploded view showing a character arrangement of a group of characters arranged on the outer peripheral surface of a type drum.

Two left-handed type groups 51, 52 and two right-handed type groups 53, 5 are spirally arranged on the outer peripheral surface of the type drum 1.
4, 4 sets of numbers, letters, and 64 alphanumeric symbols are arranged between the 4 rolls, and the above-mentioned character groups 51, 52, 53, 5
Alphanumeric symbols that are rarely used on the intersection of 4 are common print characters 55
An example provided as follows is shown below. W is the character interval, S1 is the amount of movement of the type drum in the axial direction (character interval of 8 digits), and L is the total length of the outer circumference of the type drum. By rotating the type drum 1 four times and moving axially S1 to the left or right in synchronization with the rotation, it becomes possible to select all 64 characters and symbols. Therefore, by reciprocating the type drum 1 once in the axial direction, it is possible to record two lines. FIG. 2 is a partially cutaway perspective view showing the main structure of the printer.

A type drum 1 (the total length in the axial direction is partially shortened as shown in the cutaway view) is fixed to a drum shaft 2, and a type drum 1 is spirally wound around the outer peripheral surface of the type drum 1 as shown in FIG. ,
Left-handed type groups 51, 52 and 2 with 2 lines of 64 character types
are arranged in right-handed type groups 53 and 54 of the strip, and said type group 5
A common type character 55 is provided on the intersection of 1, 52, 53, and 54.

The drum shaft 2 is supported rotatably and slidably in the axial direction. The type drum rotating means is constructed so that the drum shaft 2 is rotationally driven by a transmission mechanism using a well-known electric motor (not shown).

The type drum reciprocating means includes a pinion 3 fixed to the drum shaft 2, a camshaft 4 rotatably supported, and a gear 5 fixed to the camshaft 4 and meshing with the pinion 3 at a gear ratio of 1:9. A grooved cam 6 is fixed to the cam shaft 4 and has a cam groove 6a that controls the axial movement of the type drum 1 in synchronization with the rotation of the type drum 1, and a shaft is swingably attached to the shift lever shaft 7. The supported shift lever 8, a cam follower 9 fixed to the tip of the shift lever 8 and engaged with the cam groove 6a, and a cam follower 9 fixed to the drum shaft 2 and engaged with two upper and lower pins 10 fixed to the shift lever 8. Sleep 1 with mating circumferential grooves
1.

As shown in FIG. 2 with the number of digits omitted for convenience of explanation, the printing means is rotatably supported by a hammer shaft 12, and includes a group of type characters arranged in a spiral shape on the outer peripheral surface of the type drum 1. 51, 52, 53, and 54, corresponding hammer portions 13a,
14a, 15a, three types of hammers 13, 14, 15 having different shapes and arranged in the required number of digits in the digit direction, and hammer parts 13a, 14a, 15 from the outer peripheral surface of the type drum 1.
a plurality of springs 16 that urge each hammer 13, 14, 15 in the direction in which each hammer 13, 14, 1
A plurality of hammers 13b, 14b, 15b are fixedly installed on a frame (not shown) corresponding to the armature parts 13b, 14b, 15b of 5, and apply a striking force to each of the hammers 13, 14, 15 by being supplied with an excitation current. The solenoids 17 and the type groups 51, 52, 53, 5 of the type drum 1 are fixed to the drum shaft 2.
A type position detection wheel 18 for displaying the circumferential position of the type characters No. 4; The printed characters 53 and 54 are the hammer part 13a
, 14a, 15a, and fixed to the camshaft 4, the type drum 1 is rotated in synchronization with the rotational movement in the direction of arrow A or arrow B.
When moving in the direction, the type groups 51, 5 of the type drum 1
Left and right shift type start position detection wheels 20, 21 for displaying type start positions 2, 53, and 54; and left and right shift type start position detection wheels 20, 21.
The group of characters 51, 52, 53,
54, and magnetic detectors 22 and 23 for detecting the start positions of left and right shift type characters, respectively. FIG. 3 is an exploded explanatory diagram showing the relative positions of the grooved cam 6 and the left and right shift type start position detection wheels 20, 21.

While the type drum 1 rotates four times, the Al and A2 portions of the grooved cam 6 synchronously transmit movement to the type drum 1 in proportion to the 8-digit character interval in the axial direction. Bl,B
The second part is a switching part for reciprocating motion in the axial direction without giving the type drum 1 sudden fluctuations in acceleration. The protrusions of the left and right shift type start position detection wheels 20, 21 serve as magnetic detectors 20, 2 for detecting the left or right shift type start position, respectively.
3 shows the relationship between the position passing through the groove cam 6 and the grooved cam 6. Figure 4a
shows the relationship between the character arrangement of each digit of the left-handed character groups 51 and 52 of the character drum 1 corresponding to the character position detection signal, the left shift character start position signal, and the left shift character position signal.

An example in which the type drum 1 moves in the direction of arrow A will be explained. P1 is a print position detection signal, P2 is a left shift print position signal, P3 is a left shift print start position signal, and C
1 is the 8n-7th digit (n is a positive integer), C2 is the 8n-6th digit
digit, C3 is the 8n-5th digit, C4 is the 8n-4th digit, C5 is the 8n-3rd digit, C6 is the 8n-2nd digit, C7 is the 8n-1st digit.
The digit C8 is the character arrangement of the left-handed character groups 51 and 52 of the type drum 1 corresponding to the left-shifted character position signal P2 of the 8n-th digit. As shown in FIG. 2, the type position detection signal P1 is transmitted every time the protrusion of the type position detection wheel 18 passes the position of the type position detection magnetic detector 19, and the type position detection signal P1 is transmitted when the type group 51, 52, 53, This signal detects the position of 54 characters. The left shift type start position signal P3 is transmitted when the projection of the left shift type start position detection wheel 20 passes the position of the magnetic detector 22 for detecting the left shift type start position, and the type drum 1 moves in the direction of the arrow. This signal detects the start position of the character arrangement of the left-handed character groups 51 and 52 of the type drum 1 at the switching position of the grooved cam 6 from B2 to A2 in FIG. The left shift type position signal P2 is synchronized with the left shift type start position signal P3 and the type position detection signal P1, and a well-known control circuit controls the left-handed type groups 51, 52 of the type drum 1.
The 2N-1st signal (N is a positive integer) of the type position detection signal P1 indicating the position of the type character and the type group 51, 52, 53, 54 arranged on the type drum 1 7N- of the print position detection signal P1 indicating the position of the common print character 55
It is easily combined with the sixth signal. Furthermore, the left-shift type position signal P2 and the type arrangement C of the left-handed type group 51, 52
The left-shift printed information code to be compared with 1, C2, C3, C4, C5, C6, C7 and C8 can be easily created using a well-known control circuit. FIG. 4b is an explanatory diagram showing the relationship between the print position detection signal, the right shift print position signal, and the right shift print start position signal.

The character arrangement of the right-handed character groups 53 and 54 of the character drum 1 corresponding to the right-shift character position signal is omitted. P4 is a right shift type character position signal, and P5 is a right shift type character start position signal. Also, when the type drum 1 starts moving in the direction of arrow B, by synchronizing with the right shift type start signal P5 and the type position detection signal P1 in the same manner as above,
The right-handed type group 5 of the type drum 1 is controlled by a well-known control circuit.
2N of the print position detection signal P1 indicating the print position of 3,54
The right shift type position signal P4 is easily created by combining the 7N-6th signal of the type position detection signal P1 indicating the position of the common type 55, and the right shift type position signal P4 A right-shift type information code to be compared with the character arrangement of the right-handed type group 53, 54 of the type drum 1 corresponding to the character type drum 1 can also be easily created using a well-known control circuit. The action will be explained below.

From FIG. 2, a transmission mechanism using a well-known electric motor (not shown) rotates the drum shaft 2 in the direction of arrow P, and this rotation causes the camshaft 4 to rotate in the direction of arrow C via the pinion 3 and gear 5. Driven. As the grooved cam 6 rotates, the shift lever 8 swings about the shift lever shaft 7 via the cam follower 9 that engages with the cam groove 6a. Due to the swinging movement of the shift lever 8, an axial sliding movement is transmitted to the drum shaft 2 through the circumferential groove of the sleeve 11 that engages with the upper and lower two pins 10 of the shift lever 8, and the printing type is Each hammer 13 of the plurality of hammer groups 13, 14, 15 corresponds to the character groups 51, 52, 53, 54 of the drum 1.
The rotational and sliding motion is transmitted to the type drum 1 so as to pass through the positions a, 14a, 15a. As the drum shaft 2 rotates, each time the protrusion of the type position detection wheel 18 passes the position of the magnetic detector 19 for detecting type position, the position of the type characters in the type groups 51, 52, 53, and 54 of the type drum 1 is detected. The type position detection signal P1 is transmitted, and the rotation of the camshaft 4 causes the left and right shift type start detection wheels 2
When the projections 0 and 21 pass through the positions of the magnetic detectors 22 and 23 for detecting the start of left or right shift type,
The type drum 1 begins to move in the direction of arrow A or the direction of arrow B, and at the switching position of the grooved cam 6 from B2 to A2 or from B1 to A1 in FIG. 3, the type groups 51, 52, 53 of the type drum 1
, 54, left or right shift type start position signals P3, P5 are generated. By synchronizing the type position detection signal P1 and the left or right shift type start position signals P3, P5, a well-known control circuit controls the right-handed type groups 51, 52 or the right-handed type group 53 of the type drum 1. , 54, the left or right shift type position signals P2, P4 are easily synthesized. When printing information is input from outside, a well-known control circuit will
Left-handed type groups 51, 52 of the type drum 1 corresponding to left- or right-shifted type position signals P2, P4, left-handed type group 53,
When the left or right shift printed information code to be compared with the printed character arrangement of each digit of 54 matches the printed information of each input digit, an excitation current is applied to each solenoid 17 of that digit. Each amateur section 13b, 14b, 1
5b are respectively attracted, and a printing force is applied to each hammer 13, 14, 15 against the biasing force of the spring, and a group of type characters 51, arranged on the outer circumferential surface of the type drum 1 that moves past.
While selecting the desired type for each digit from 52, 53, and 54,
Each hammer section 13a, 14a, 15a makes a mark on a recording medium (not shown) via an ink ribbon (not shown), and input print information is recorded on the recording medium. In addition to the illustrated example, devices such as a plate cam and a linear motor may be used as the type drum reciprocating means in the present invention.

It is also possible to apply a striking force to the hammer via a snap curl as a recording means. FIG. 5 shows two groups of left-handed type characters 151, 152 and two groups of right-handed type characters 153, 154 arranged spirally on the outer peripheral surface of a type drum 101 according to a second embodiment of the present invention. , alphabetical characters, alphanumeric symbols, kana characters, and 126 kana symbols.
It is a partially expanded view showing a type arrangement arranged between five rolls.

Common print characters 1 include frequently used numbers, alphanumeric symbols, and alphabetic characters E on the intersections of the print groups 151, 152, 153, and 154.
This is an example provided as 55. W is the character interval, and S2 is the axial movement amount of the type drum 101 (character interval of 9 digits)
, L is the total length of the outer circumference of the type drum 101. The type drum 101 rotates 10 times (one rotation out of the 10 rotations is B1 in Fig. 3,
A switching section for the reciprocating motion in the axial direction of the type drum 101 corresponding to B2), and in synchronization with the rotation of the type drum 101
By reciprocating once in the axial direction, all characters and symbols can be selected. In addition, when printing only common type characters 155 mainly consisting of numbers, the type drum 10
1 rotates 5 times (0.5 rotation of the 5 rotations is a switching part of the axial reciprocating motion of the type drum 101), and the type drum 101 moves S2 to the left or right in the axial direction in synchronization with the rotation. Therefore, it is possible to select all common type characters 155, ie, the printing speed is twice that of selecting all characters and symbols. Although an impact printer has been described as an embodiment of the printing means in the present invention, there are also electrostatic printers that use electrostatic latent images by using a type drum made of transparent glass, etc., and exposure printers that use electrostatic latent images. It can also be easily applied to non-impact printers such as phototypesetting printers using development.

As described above, the present invention makes it possible to reduce the diameter of the type drum even when the number of types of characters, numbers, and symbols, that is, the print capacity is large, and to provide a compact printer without deteriorating print quality. can.

By using the type provided on the intersection of the left-handed and right-handed type groups arranged in a spiral pattern on the outer peripheral surface of the type drum as a common type for each type group, the type density can be increased. It is possible to provide a printer that can print at twice the printing speed when printing only the common type, and can print at twice the printing speed when printing only the common type. Monkey.

[Brief explanation of the drawing]

Figure 1 shows 64 of the type groups arranged on the outer peripheral surface of the type drum.
Figure 2 is a partially exploded perspective view showing the main mechanism of the printer, and Figure 3 shows the relative positions of the groove cam and the left and right shift type start position detection wheels. The expanded explanatory diagram, FIGS. 4A and 4B, shows the type arrangement of each digit of the type drum corresponding to the type position detection signal, the left and right shift type start position signals, the left and right shift type position signals, and the left shift type position signal. An explanatory diagram showing the relationship, FIG. 5 is a partially exploded view showing the arrangement of 126 types of characters in a group of characters arranged on the outer peripheral surface of the type drum. 1,101... Type drum, 2... Drum shaft, 3... Pinion, 4... Camshaft, 5... Gear, 6...Groove cam, 8.
...Shift lever, 9...Cam follower, 13,14,15...Hammer, 17...
... Solenoid, 18... Print position detection wheel, 19... Magnetic detector for detecting print position, 20
・・・・・・Left shift type start position detection wheel,
21... Right shift type start position detection wheel, 22... Magnetic detector for left shift type start position detection, 23... Magnetic detector for right shift type start position detection. ,51,52,151,152・
... Left-handed type group, 53, 54, 153, 154
・・・・・・Right-handed type group, 55,155・・・・・・
Common type.

Claims (1)

[Claims] 1. It has a first type group consisting of a plurality of type characters arranged in a left-handed spiral shape on the outer peripheral surface and a second type group consisting of a plurality of type characters arranged in a right-handed spiral shape, and performs rotational movement. a type drum that reciprocates in its axial direction in synchronization with the rotational movement; and a plurality of hammers that are disposed close to the outer periphery of the type drum and parallel to the axis of the type drum and that hit the type as appropriate. , a paper conveying means for feeding printing paper disposed between the hammer and the type drum, a line printer comprising a first group of type characters and a first type group disposed on the outer peripheral surface of the type drum. A line printer characterized in that the printed characters at the intersection of the two printed character groups are common printed characters used as printed characters in both the first printed character group and the second printed character group.