JPS6150786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact type dot printer for forming dot matrix characters, images, figures, etc.

According to impact-type dot printers with conventional configurations, in order to increase the printing speed, it is necessary to increase the number of printing elements such as wires or shorten the driving cycle of each printing element.In the former case, the printing head This increases the size and weight of the printer, and in the latter case, a severe load is placed on the drive unit of each printing element, resulting in disadvantages such as a shortened head life.

An object of the present invention is to enable high-speed printing with a small number of printing elements and without placing a burden on the drive unit.

Another object of the present invention is to provide a printing head having a platen having a plurality of protrusions on its outer peripheral surface and a hammer member that faces the protrusions intersectingly, so that a collision occurs between the two at the intersection of the protrusions and the hammer members. In a cross hammer type dot printer that forms dots, the number M of hammer members, the spacing D between them, the inclination angle θ, and the scanning speed V of the printing head are tanθ=Ph/Pv・Q×MD D=(kM+1)×Ph A function of V=Ph・f/Q×M (where Ph and Pv are the horizontal and directional pitches of the dot matrix, and Q is the ability of one hammer member to be driven continuously while the platen rotates 1/N) The object of the present invention is to provide a cross-type dot printer that performs high-speed printing using a plurality of hammer members in a virtual circuit, where f is the response frequency when the hammer members are continuously driven, and k is an arbitrary constant.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an impact type dot printer according to the present invention will be described below with reference to the drawings.
This example is an example where M=2 and k=1,
The printing method will become more clear from the explanation of the operation of this embodiment.

In FIG. 1, side plates 1 and 2 are installed in parallel with each other at a predetermined distance via support columns (not shown). A cylindrical platen 3 is provided between the side plates 1 and 2, and a platen shaft 4 to which the platen 3 is fixed is rotatably supported by the side plates 1 and 2. The right end of the platen shaft 4 projects rightward from the side plate 2, and a gear 5 and a slit disk 6 are fixed to this projecting end. The slit disk 6 has a large number of slits (not shown) on its outer periphery, and this outer periphery fits into the recess of the detector 7. The gear 5 is rotationally driven by a motor (not shown), so that the platen 3 is continuously rotated clockwise in FIG. 3. The platen 3 has a plurality of wires (12 in this embodiment) on its outer circumferential surface.
As shown in FIG. 3, a narrow pointed protrusion 8 is formed as an integral protrusion, and as shown in FIG. and extend parallel to each other. The printing head 9 faces the platen 3 and is scanned in the same direction as its axis via a suitable scanning drive device (not shown), and is fixed between the side plates 1 and 2. It is constructed as described below on a carriage 12 which is slidably supported by two guide shafts 10 and 11.

As shown in FIGS. 2 and 3, protrusions 13 and 14 are integrally formed on the front surface of the carriage 12, and each protrusion has a triangular leaf spring member 15,
The lower end of 16 is attached via a pin 17. Each leaf spring member 1 supported in this cantilever shape
5 and 16 are equipped with thin plate-like hammer members 18 and 19 at their free ends, and each hammer member 18,
19 faces the protrusion 8 of the platen 3 in a crosswise manner as shown in FIG. Further, a recess 20 is formed in the carriage 12, and an outer magnetic pole plate 21, a plate-shaped permanent magnet 22, and a yoke plate 23 are arranged in a stacked manner in a sandwich pattern. The external shapes of the permanent magnet 22 and the yoke plate 23 are the same as that of the outer magnetic pole plate 21 shown in FIG. The outer magnetic pole plate 21 has two circular holes 24 and 25, and the permanent magnet 22 also has corresponding holes 26 and 27 (in the drawing, holes 26 and 27 with a slightly larger diameter than the holes 24 and 25). Only part 26 is the third
As shown in the figure. ) is formed. Two center magnetic pole posts 28 and 29 (only the center magnetic pole post 28 is shown in FIG. 3) are fixed to the front surface of the yoke plate 23. penetrate through the holes 26 and 27 to reach the holes 24 and 25, and the center magnetic pole posts 28 and 29 and the outer magnetic pole plate 21 are magnetized with different polarities via a permanent magnet 22. In the magnetic flux gaps formed between the hole 24 of the outer magnetic pole plate 21 and the center magnetic pole post 28, and between the hole 25 of the outer magnetic pole plate 21 and the center magnetic pole post 29, there is a Fixed cylindrical moving coils 30 and 31 are inserted therethrough. As shown in FIG. 3, a recording paper 32 and an ink ribbon 33 are arranged between the platen 3 and the hammer members 18, 19, and the recording paper 32 is passed through a paper feeding device (not shown). In Fig. 3, a predetermined amount is sent upward intermittently.

By the way, the hammer members 18 and 19 are arranged side by side along the scanning direction of the print head 9 as shown in FIG. It is tilted against. In FIG. 3, when the platen 3 rotates, the protrusions 8 on its outer peripheral surface successively pass downward in front of the hammer members 18 and 19. On the other hand, each of the hammer members 18 and 19 is activated when a driving pulse is printed on each of the movable coils 30 and 31.
The forward displacement force generated in the hammer members 31 causes the hammer members 18 and 19 to move forward through the leaf spring members 15 and 16, causing each of the hammer members 18 and 19 to collide with the protrusion 8 that is moving in front of the hammer members 18 and 19. 33, a rectangular dot (see FIG. 5) is recorded where the protrusion 8 and each hammer member 18, 19 intersect. By causing the protrusion 8 and each of the hammer members 18 and 19 to collide with each other at an appropriate timing, it is possible to form characters or the like in a desired dot matrix.

Next, the inclination angle .theta. of the hammer members 18 and 19, the spacing D between them, and the scanning speed V of the print head 9 to the right in FIG. 1 will be explained with reference to FIG.

Generally speaking, the number of hammer members 18 and 19 is M, the number of protrusions 8 on the platen 3 is N, and each pitch in the horizontal and vertical directions of the dot matrix is
Ph, Pv (see Figure 5), while the platen 3 rotates 1/N, the virtual number of times the hammer member 18 or 19 can be driven continuously is Q, the hammer member 18 or 19 is driven continuously. When the response frequency is f, the inclination angle θ of the hammer members 18 and 19
, the spacing D between them, and the scanning speed V of the print head.
is tanθ=Ph/Pv・Q×M……(1) D=(kM+1)×Ph……(2) V=Ph・f/Q×M……(3) =Pv・f・tanθ (4) is set to a value calculated by the relational expression (1), (2), (3), or (4), or a value approximated thereto.

However, k in the above relational expression (2) is an arbitrary integer of 1 or more.

Every time the platen 3 rotates 1/N (at this time, the protrusion 8 moves downward by Pv·Q relative to the recording paper 32 on the paper surface), the protrusion 8 moves the hammer member 18,
19 at the same position (vertical direction). On the other hand, the printing head 9 (hammer members 18, 1
9) is horizontal while the platen 3 rotates 1/N.
Only Ph and M are scanned. The hammer members 18 and 19 are tilted so that the intersecting position of the protrusion 8 and the hammer member 18 or 19 is aligned vertically on the recording paper 32 even when the print head 9 is scanned to the right. There is. The inclination angle θ of the hammer members 18 and 19 changes the arrangement of the dot rows in the vertical direction depending on its size, but the value calculated by the above relational expression (1) depends on the design of the dot matrix. Therefore, it can be corrected with some tolerance. Specifically, in this example, Ph=25.4/12×1/
6≒0.35 (mm), Pv=25.4/9×1/7≒0.40 (mm), M=
2 (books), N = (books), Q = 10 (times), f = 1800 (Hz), k = 1
From the above relational expression, θ≒10°, D=3Ph,
Each is set to V=127mm/sec. As a result, in the printing head 9 of this embodiment, when the hammer member 18 forms a dot in the a-th column in FIG. 5, the hammer member 19 forms a dot in the (a-3)-th column, and Next, the hammer member 18 forms dots in the (a+2)th column, as shown by the magnetic lines, and the hammer member 19 forms dots in the (a-1)th column, as shown by the broken lines. . That is, the hammer members 18 and 19 form two dot rows in parallel almost simultaneously with three rows apart from each other, and the formation of each dot row by the hammer members 18 and 19 coincides with the scanning of the print head 9. They move sideways, row by row.

FIG. 6 shows the alphanumeric characters "A", "B", "C", and "D" in a dot matrix of 5 columns and 7 rows formed by the printer of this embodiment, and shows the formation process. It is shown in FIGS. 7A to 7D.
In FIGS. 7A to 7D, the dots with diagonal lines on the right indicate dots formed by the hammer member 18 located at the head in the scanning direction, and the dots with diagonal lines on the left indicate the dots formed by the hammer member 18 located at the beginning in the scanning direction. 19, and blank dots indicate dots already formed in the previous step. First, dots in the second column are formed in the second and fifth rows by the hammer member 18, as shown in FIG. 7A. At this time, the hammer member 19 is still in the non-print area and is not driven. Next, as shown in FIG. 7B, the dots in the fourth column are formed in the second and fifth rows by the hammer member 18, and in parallel, the dots in the first column are formed by the hammer member 19. Third,
4... Formed on the 7th line. Next, as shown in FIG. 7C, the hammer member 18 is not driven because it corresponds to the blank space between the characters in the 6th line, and the hammer member 19 moves the dots in the 3rd column to the 1st and 5th dots.
Formed in the row. Next, as shown in FIG. 7D, the dots in the 8th column (the 2nd column of the 2nd digit character) are formed in the 1st, 3rd, and 7th rows by the hammer member 18, and In parallel, dots in the fifth column are formed by the hammer member 19 in the third, fourth, . . . seventh rows. In this way, two rows of dots separated by three rows are formed almost simultaneously and in parallel, and the formation of these two rows of dots is moved to the right two rows at a time by scanning the print head 9. By moving, the desired characters shown in FIG. 6 are formed.

FIG. 8 shows the arrangement of the hammer members 34, 35, 36 in the case of M=3, k=2, and shows the inclination angle θ of each hammer member 34, 35, 36, the spacing D between them, and in this case The scanning speed V of the print head 9 is as determined by the relational expressions (1), (2), and (3).

9A to 9G show the character forming process in this case, and in the same figure, the right diagonal line dots, the left diagonal line dots, and the grid diagonal line dots are hammer members 34, 35, and 36, respectively. The blank dots indicate dots already formed in the previous step. First, the third row of dots is formed by the hammer member 34, as shown in FIG. 9A. At this time, the hammer members 35 and 36 are still in the non-printing area, and
Not driven. Next, the hammer member 34
As shown in the figure, it corresponds to the 6th column,
Since there is a blank space between characters, this hammer member 34 is not driven, and the hammer members 35, 3
6 is still in the non-print area and is not driven. Next, as shown in FIG. 9C, a dot in the ninth column (third column of the second digit character) is formed by the hammer member 34, and in parallel, a second dot is formed by the hammer member 34.
The rows of dots are formed by the hammer member 35. The hammer member 37 is still in the non-print area. Next, as shown in FIG. 9D, the hammer member 34 is not driven because it corresponds to the blank space between the characters in the 12th column (the 6th column of the 2nd digit character), and is driven by the hammer member 35. A fifth row of dots is formed. The hammer member 36 is not driven at this stage as it is still in the non-print area. Hammer member 36
reaches the printing area in the next step. That is, the three hammer members 34, 35, 36 are all aligned in the printing area for the first time, and as shown in FIG. The dots in the (3rd column of the 3rd digit character), the dots in the 8th column (2nd column of the 2nd digit character), and the dots in the 1st column of the 1st digit character are approximately formed in parallel at the same time. After this,
The formation of dots by each of the hammer members 34, 35, and 36 progresses to the right three rows at a time as the head scans to the right, as shown in FIGS. 9F and 9G. That is, in the case of M=3 and k=2, when all of the hammer members 34, 35, and 36 are aligned in the printing area, three rows of dots are formed (2×3+1) corresponding to the above arrangement of each hammer member. The dots are formed almost simultaneously and in parallel separated by ×Ph=7Ph, and the formation of dots in each row progresses sequentially to the right three rows at a time by head scanning.
Dot matrix characters as shown in the figure are formed.

In the impact type dot printer according to the present invention, the dots in the column direction are not formed simultaneously, but in order from the top with a slight time difference. The number M of the hammer members and the constant k can be arbitrarily selected, but the inclination angle θ of each hammer member, the spacing D between them, and the scanning speed V of the print head are determined by the number M of the hammer members as described above. It should be noted that this differs depending on the constant k. Furthermore, the supporting structure and electromagnetic driving device for the hammer member are not limited to the above embodiments, and can be freely modified in design without departing from the scope of the claims.

According to the impact type dot printer according to the present invention described in detail above, the printing speed can be increased without placing a severe burden on the drive unit of each hammer member, in other words, without increasing the response speed of each hammer member. Moreover, since the print head has a simple configuration and a small number of parts, it can be manufactured in a lightweight, compact, and low-cost manner. Also, the spacing D between the plurality of hammer members, the inclination angle θ, and the scanning speed V of the printing head.
By setting M in the relationship defined in the claims based on the number M of hammer members, the response frequency f, and other factors, even in a cross hammer type dot printer, M rows of dot rows can be mutually (kM +
1) The dots can be formed almost simultaneously in parallel with only one row separated horizontally, and each of the above dot rows can be formed by moving horizontally M rows at a time as the print head scans, and the dots can be formed at high speed. Printing is possible. In addition, each hammer member is mounted on a cantilever-shaped leaf spring member, and the hammer member is driven via a moving coil type electromagnetic drive device, which eliminates frictional sliding parts and improves durability. Reliability is improved and the hammer member can be actuated sharply with a small current.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an impact type dot printer according to an embodiment of the present invention, and FIG.
Figure 3 is an enlarged front view of the print head seen from the line.
Fig. 2 - Line sectional view, Fig. 4 shows M=2, k=
An explanatory diagram showing the arrangement of each hammer member in case 1,
FIG. 5 is an explanatory diagram for explaining how dots are formed by the cooperation of each hammer member and the protrusion of the platen, and FIG. 6 is an explanatory diagram illustrating how dots are formed by the printer of the present invention. An enlarged front view showing characters in a matrix as an example; FIGS. 7A to 7D are explanatory diagrams showing the process in which characters are formed by the same printer; FIG. 8 shows M=3, k=2 Explanatory diagrams showing the arrangement of each hammer member in the case of , Fig. 9A ~
FIG. 9G is an explanatory diagram showing the process of forming characters in the same case as above. 3...Platen, 8...Protrusion, 9...Printing head, 15, 16...Plate spring member, 18, 19...
Hammer member, 21, 22, 23, 28, 29, 3
0, 31... Electromagnetic drive device, 30, 31... Moving coil, 32... Recording paper, 33... Ink ribbon, 34, 35, 36... Hammer member.

Claims (1)

[Claims] 1. A rotating platen is provided with a plurality of protrusions extending substantially parallel to the axial direction on its outer circumferential surface, and is configured to face the platen and scan in the same direction as the axial direction. The printing head is provided with a plurality of hammer members facing the protrusions in an intersecting manner, and an electromagnetic drive device that causes each of the hammer members to collide with the protrusion, and each of the hammer members is configured to record. The hammer members are arranged in parallel in the scanning direction at an angle with respect to the paper feeding direction, and the inclination angle θ of each of the hammer members and the distance between the parallel arrangement D
And the scanning speed V of the print head is substantially as follows: tanθ=Ph/Pv・Q×M D=(kM+1)×Ph V=Ph・f/Q×M Where, M: Number of hammer members N: Number of protrusions on the platen Ph: Horizontal pitch of the dot matrix Pv: Vertical pitch of the dot matrix Q: Virtual circuit f in which one hammer member can be driven continuously while the platen rotates 1/N: An impact type dot printer configured by satisfying the following relationship: response frequency k when a hammer member is continuously driven; an integer greater than or equal to 1. 2. The impact dot printer according to claim 1, wherein each of the hammer members is provided on a cantilever-shaped plate spring member that is displaced by the electromagnetic drive device. 3. The impact dot printer according to claim 1 or 2, wherein the electromagnetic drive device includes a moving coil, and the hammer member is driven by displacement of the moving coil.