JPS6183049A - Printing head of wire dot printer - Google Patents

Abstract

PURPOSE:To increase the printing speed of a printing head by almost eliminating the rebounding of a movable part, by providing a damping mechanism having an inertia member impinging on the movable part when the movable part performs return operation. CONSTITUTION:The same number of leaf springs 21 as armatures 2 are formed and inertia members 23 are fixed to the leading ends of said leaf springs 21 to constitute a damping mechanism 71. The mechanism 71 is attached to the insulating member attached to a base 7. When the armatures 2 perform return operation, the leading ends of the armatures 2 impinge on the inertia members 23 and male screws 19a are regulated so that the impingement of said armatures 2 is performed immediately before the return of the armatures 2 to a stand-by position. Further, the equivalent of the damping mechanism 71 is made almost equal to that of the operation part of one set consisting of one set of an arm part 3 and one printing wire 6. Because of this, when the armatures 2 impinge to the inertia members 23, the armatures 2 are almost brought to a stationary state and the operation of the armatures 2 receives no effect of the elastical change of the damping mechanism 71 and a printing speed can be increased.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention is directed to attaching a printing wire to the end of a movable part, printing dots at the tip of the printing wire, and forming patterns such as characters by a collection of these dots. The present invention relates to a print head of a wire dot printer in which a print head is formed, and in particular to a damping mechanism that can speed up the return operation of a movable part and improve printing speed as a result.

[Prior art and its problems]

The print heads of wire dot printers are classified into 1 cta stone type, spring open type, etc. depending on the method of pseudo-movement of the print wire.
The latter uses a permanent magnet to deflect the printing wire in advance against the spring force, and during printing, the coil is energized to cancel the magnetic flux caused by the permanent magnet, and the printing wire is driven by the restoring force of the spring force. FIG. 1 is a vertical sectional view of a conventionally used open-spring print head, and FIG. 2 is a partial plan view of the movable portion 5 in FIG. 1.

In FIGS. 1 and 2, l is a beam-shaped spring part, 2 is a bar-shaped armature made of ferromagnetic material fixed to one end of the spring part 1, and 3 is an arm-shaped part made of the spring part 1 and the armature 2. , 4 is an annular support part made of ferromagnetic material, and this support part 4
The other end of the spring portion 1 is fixed to the inner side of the support portion 4 so that arm portions 3 in a number equal to the number of printed dots protrude toward the center of the support portion 4 . 5 is the above-mentioned arm-like part 3 and support part 4
It is a movable part consisting of. 6 is a printing wire with one end protruding toward one side of the movable part 5 (upper side in FIG. 1) and the other end fixed to the tip of the armature 2; 7 and 9 are ferromagnetic wires having approximately the same outer diameter; A disc-shaped base made of material and an annular plate-shaped magnetic path member 8 are annular plate-shaped permanent magnets having an outer diameter and width approximately equal to the outer diameter and width 6 of the magnetic path member 9. The magnet 5 is magnetized in its axial direction, and in this case, the outer diameter and width of the support portion 4 are both approximately equal to those of the magnetic path member 9. 10 is an annular plate-shaped yoke made of ferromagnetic material whose outer diameter is approximately equal to that of the support part 4 and whose width is wider than the width of the support part 4; 11 is a yoke 10
12 and 13 are intermediate wire guides and tips fixed within the cover 11 so as to close the inside of the funnel at the middle and tip of the funnel, respectively. It is a wire guide. The permanent magnet 8, the magnetic path member 9, the movable part 5, and the yoke 10 are sequentially stacked on the base 7, and the cover 11 is stacked on top of this with a protrusion provided at the stacked end so that the tip of the funnel faces upward. The movable portion 5 and the yoke 10 are formed such that when the yoke 10 is fixed with the screws 14, the inner circumferential surface of the yoke 10 and the protrusion 2a face each other with a narrow gap interposed therebetween. The free end of the printing wire 6 passes through a through hole provided in the wire guide 12.13 and projects out of the cover 11. 15 is an armature 2 with one end facing the lower surface of the armature 2 through a slit and the other end fixed to the base 7.
16 is a coil wound around the core 15, 17 is a cylindrical electrically insulating member that passes through the center of the base 7 and is fixed with adhesive or the like, and 18 is an insulating member. This is the lead wire of the coil 16 that passes through the coil 17. 1
Reference numeral 9 designates a shock absorber in which a metal disk 19b is fixed to one end of a male screw 19a, and a rubber plate 19C is attached to the upper surface of this disk 19b. The male screw 19a is
is screwed into an internal thread provided on the insulating member 17. 2
0 is a lock nut for preventing rotation of the male screw 19a.

Since the print head shown in FIG. 1 is constructed as described above, when the coil 16 is not energized, the magnetic flux from the permanent magnet 8 is transferred to the magnetic path member 9, the support portion 4, the yoke 101, and the yoke 101.
0 and the protrusion 2a, the armature 2, the narrow gap between the armature 2 and the iron core 15, the iron core 15, and the base 7. As a result, this magnetic flux causes the armature 2 to spring. The portion 1 is bent and adsorbed to the iron core 15. When the coil 16 is energized via the lead wire 18, the magnetic flux generated by the coil 16 cancels out the magnetic flux generated by the permanent magnet 8, so the attractive force against the armature 2 disappears. Therefore, the armature 2 is driven upward by the restoring force of the spring portion 1, and as a result, the free end of the printing wire 6 collides with the printing object such as paper (also shown) via the ink ribbon (not shown). As a result, one dot is printed.Since the current flowing through the coil 16 has already been extinguished by the time the printing wire 6 collides with the object to be printed, the armature 2 is configured to prevent the printing wire 6 from hitting the object to be printed. Due to the repulsive force upon collision and the attractive force due to the magnetic flux of the permanent magnet 8, the coil 16 returns to its state when it is not energized.

That is, the position of the printing wire 6 or the position of the armature 2 when the armature 2 is attracted to the iron core 15 is the standby position of these members.

Since the print head shown in FIG. 1 operates as described above, the armature 2 always collides with the iron core 15 when the print wire 6 returns to the standby position, and in this case, without the shock absorber 19, the armature 2 would bounce several times. Then stand still. FIG. 3 is an example of the experimental results of observing the operating state of the armature 2 when there is no shock absorber 19. Displacement S in the figure indicates the displacement of the armature 2 from the iron core 15, and point P
is the position of the armature 2 when the printing wire 6 collides with the object to be printed and printing is performed. The dotted curve shows the state of free vibration of the armature when it is assumed that the printing object and the iron core 15 are removed after the armature 2 starts the printing operation, and T is the period of this vibration. In the figure, the printing operation is performed twice at intervals equal to the period T. Tr is the rebound time, and in this case Tr+T/2:To<T, so the second printing is performed without being affected by the rebound, but if the second printing operation is started during the rebound. Then, as can be clearly inferred from the figure, the printing force and printing time in this printing are different from those in the first printing, and as a result, for example, printing distortion occurs. Therefore l/'T.

is the maximum frequency of printing operation in this case.

It is necessary for the print head that this maximum frequency is as high as possible, that is, that the printing speed is high, and for this purpose, it is necessary to make the rebound time Tr as short as possible. The shock absorber 19 in FIG. 1 shortens the rebound time Tr.

The rubber plate 19c is made of butyl rubber, in order to absorb as much kinetic energy as possible from the armature 2, etc. returning to the standby position, and to quickly bring these moving members to a standby position. Nitrile rubber, fluorine rubber, etc. are used, and the rubber plate 19C is formed in such a size that the tip of the armature 2 collides with it, and the vertical position of the rubber plate 19C is set just before the armature 2 reaches the standby position. The armature 2 is set by a male screw 19a and a lock nut 20 so that its tip collides with the rubber plate 19C. In FIG. 1, since the shock absorber 19 is provided as described above, when the armature 2 is in the standby position, the iron core 15 and the rubber plate 19 are
Both G are pressed by armature 2.

In the print head shown in Fig. 1, the moving members such as the armature 2 are cushioned by the rubber plate 19c as described above, but the elasticity of the rubber that provides this cushioning effect depends on the temperature dependence and the frequency of vibration in the case of repeated loads. It is well known that there is a dependence on
Therefore, the armature 2 is repeatedly driven and the rubber plate 1
When a load is repeatedly applied to the rubber plate 9c, and as a result, heat is generated within the rubber plate and the temperature of the rubber plate increases, or when the ambient temperature of the print head changes, the elastic modulus of the rubber plate 19C changes, Furthermore, the elastic modulus of the rubber plate 19c changes depending on the operating frequency of the armature 2 and the like. Rubber plate 19c
When the elastic modulus of armature 2 changes, the rebound time when armature 2 collides with rubber plate 19c changes, and armature 2
If the next armature drive, that is, the printing operation, is started before the armature has come to a standstill, printing distortion will occur as described above.Conventionally, the elastic modulus of the rubber plate 19c changes greatly, and printing is performed assuming a fairly long rebound time. Therefore, there was a problem in that it was difficult to increase the printing speed with the print head as shown in FIG.

The above explanation has been about a spring release type print head, but an electromagnetic type print head is also provided with a shock absorber to quickly stop the armature in the standby position, and this shock absorber usually also has rubber. Therefore, the electromagnetic rectangular print head having such a structure has the same problems as the spring release type described above.

[Purpose of the invention]

The present invention solves the above-mentioned problems in the conventional print head, and the armature hardly rebounds when the armature returns to the standby position, and as a result, printing speed can be improved. An object of the present invention is to provide a print head for a wire dot printer having a damping mechanism for a movable part including a damping mechanism.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention provides an inertial member having rigidity or viscoelasticity disposed opposite to the movable part so as to collide with the movable part when the movable part performs a return operation. , a damping mechanism consisting of an elastic support member that supports the inertial members individually or continuously is provided, and the same image mass of the portion of the damping mechanism corresponding to each inertial member and the movable part and the printing wire are provided. The related parts are formed so that the image masses of a set of moving parts are almost equal. By configuring this way, when the moving part collides with a stationary inertial member, the moving part will move according to the law of conservation of momentum. The damping mechanism is in a stationary state with almost no rebound, and this action is performed almost independently of the ambient temperature and the elasticity of the damping mechanism, thereby making it possible to increase the printing speed. Further, in the second aspect of the present invention, in the print head having a damping mechanism in which the inertial member of the print head according to the first aspect of the invention is supported by a separate elastic support member,
Furthermore, a second damping member having elasticity made of rubber or the like is provided, and when the movable part of the second damping member collides with the inertial member, the damping mechanism to which the inertial member is attached collides with the second damping member. By configuring the damping mechanism in this manner, the damping mechanism comes to a standstill quickly, and as a result, the return operation of the movable part is performed quickly and reliably, thereby improving the printing speed. This is what I did.

[Embodiments of the invention]

FIG. 4 is a partial perspective view of the first embodiment of the first invention, and FIG. 5 is an external view of the shock absorber 24 in FIG.
is a plan view, and the figure (to) is a longitudinal side view. In FIG. 4, a part of the yoke 10 is shown broken, and the insulating member 17 in FIG. 1 is also omitted in FIG. It is formed so as to individually surround 2a. In FIGS. 4 and 5, reference numeral 21 denotes a leaf spring as a beam-like support member formed by providing radial slits 22 on the outside of an elastic disc, and the number of leaf springs 21 is equal to the number of armatures 2. Only each plate is formed.

An inertia member 23 made of rigid metal, viscoelastic rubber, or the like is fixed to the tip of the spring 21 by welding, adhesive, or the like. 71 is the leaf spring 2 mentioned above.
1 and an inertial member 23. 2
4 is a male screw having one end fixed to the surface of the disk opposite to the surface on which the inertial member 23 is attached so as to be coaxial with the damping mechanism 71 and the disk forming the plate spring 21; 19a, and this damping device 24 is attached to an insulating member (not shown) attached to the base 7. The damping device 24 is formed such that the inertia member 23 collides with the tip of the armature 2 when the armature 2 performs a return operation while being attached to the print head in this manner, and
The position of the damping device 24 is set by the male screw 19a so that the collision occurs immediately before the damping device returns to the standby position, and in this case, the individual equivalent masses of the damping mechanism 71 corresponding to the individual inertia members 23, i.e. - an equal image mass of the damping mechanism 71 consisting of two inertial members 23 and one leaf spring 21 to which the inertial members are fixed; - a set of arm-shaped parts 3 and one printing wire 6 The related members are formed so that the image masses of one set of operating parts are approximately equal. Therefore, in the print head of Fig. 4,
When the armature 2 collides with the inertia member 23 when returning to the standby position, the inertia member 23 is blown off according to the law of conservation of momentum and the armature 2 almost stands still, so that almost no rebound of the armature 2 occurs during printing operation. Such operation of the armature 2 is hardly affected by elastic changes in the damping mechanism 71, and therefore is not affected by changes in ambient temperature or printing operation speed. In other words, in the print head shown in Fig. 4, armature 2
Since the printer stops quickly without rebounding, printing can be performed at a high speed.

FIG. 6 shows an example of experimental results obtained by observing the operational states of the main parts in FIG. 4, and the displacement U in the figure indicates the displacement of each part from the standby position. In FIG. 6, a characteristic line X indicates the operating state of the armature 2, and a characteristic line Y indicates the operating state of the inertial member 23. As is clear from the figure, the armature 2 is inertial member 2 immediately before the return operation standby position.
The inertia member 23 can be stopped at the standby position with almost no rebound after colliding with the inertial member 23.
Since the damping mechanism 71 is configured so as to be able to return to the machine position, such a print head can increase the printing speed.

FIG. 7 is a partial perspective view of the second embodiment of the first invention, and FIG. 8 is an external view of the damping device 25 in FIG. FIG. 7th
What differs from FIGS. 4 and 5 in FIGS. 4 and 8 is the damping device b≠l device 25, in which case the e device 25 has a radial slit 26 inside the elastic annular plate. a damping mechanism 72 consisting of a leaf spring 27 as a beam-like support member formed by providing a damping mechanism 72 and an inertia member 23 fixed to the tip of each leaf spring 27; A cylinder 2 fixed to the opening edge by, for example, welding.
8; a disk 1 that closes the other open end of the cylinder 28;
9b and a male screw 19a fixed at one end to the outer surface of a disc 19b so as to be coaxial with a cylinder 28, and the number of leaf springs 27 equal to the number of armatures 2 is formed. This damping device 25 is also attached to the print head in the same manner as the damping device 24, and the damping device [25 is attached to the print head in this way and when the armature 2 performs a return operation, the inertia member 25
3 is formed so as to collide with the tip of armature 2,
In addition, the position of the damping device 25 is set by the male screw 19a so that the collision occurs immediately before the armature 2 returns to the standby position, and in this case, the damping mechanism 72 corresponding to each inertial member 23 is individually equivalent. mass,
That is, the equivalent mass of the damping mechanism 72 consisting of - inertia members 23 and one plate spring 27 to which these members are fixed, and - pairs of arm-like portions 3 and one printing wire 6. The related members are formed so that the equivalent masses of one set of operating parts are approximately equal. Therefore, in the print head of FIG. 7, as in FIG. 4, when the armature 2 performs the return operation, the armature does not rebound.

FIG. 9 is an external view of the damping device 29 in the third embodiment of the first invention, and FIG. 4 is a plan view, and FIG. 9 (Bl is a vertical side view). Although not shown, this print head has one damping device 2 instead of the damping device 24 in FIG.
9 is attached. Reference numeral 30 denotes pins having rigidity equal in number to the number of armatures arranged on the circumference, and one end of the pins 30 protrudes into a cylindrical damper 31 made of a viscoelastic material such as rubber. A disk 19b and a male screw 19a are fixed to the bottom surface of the damper 31 in the same manner as the damping device 25 shown in FIG. 8.

The damping device 29 is constructed as described above and is formed such that when it is assembled into a print head (not shown), the armature collides with the protrusion of the pin 30, so that the pin 30 and the damper 31 are It has the functions of the inertial member 23 and leaf spring 21 in FIG. 5, and 73 is a damping mechanism consisting of a pin 30 and a damper 31 having such functions. In this case, the equivalent mass of the partial damping mechanism forming part of the damping mechanism 73, consisting of one pin 30 and the portion of the damper 31 corresponding to this pin, is as in the embodiment of FIG. The damping mechanism 73 is formed so as to be equal to the equal image mass of a set of operating parts consisting of a set of arm-like parts and a single print wire in the print head to which the damping device 29 is attached. Similarly to the print head shown in FIG. 4, a print head using the damping device 29 is also a print head in which the armature is less prone to rebound. The damping device 29 has the advantage that it is easier to manufacture than the damping devices 24 and 25 because the pin 30 is embedded in the damper 31 by a molding method.

FIG. 1O is an external view of a damping device 32 according to a fourth embodiment of the first invention, in which the inside of the figure is a plan view and the figure (toward) is a longitudinal sectional side view. Although the print head with the damping device 32 attached thereto is not shown, which print head is attached to the damping device 3 in place of the damping device 24 in FIG.
2 is attached. The difference between FIG. 10 and FIG. 9 is that instead of the pin 30 in FIG. 9, plate members 33 are provided radially with their plate surfaces parallel to the axis of the damper 31. Reference numeral 74 denotes a damping mechanism consisting of the plate member 33 and the damper 31 configured in this manner. In this case as well, the equal image mass of the partial damping mechanism forming a part of the damping mechanism 74, which is composed of one plate-like member 33 and the portion of the damper 31 corresponding to this member, is the print head to which the damping device 32 is attached. Since the damping mechanism 74 is formed so as to be equal to the equal image mass of a set of operating parts consisting of a set of arm-like parts and a single printing wire, such a damping device 32 is also The same operation and effect as the damping device 29 shown in the figure can be achieved.

In the damping device 32, the plate area of the plate member 33 is increased and the plate thickness is reduced relative to the predetermined value of the equivalent mass, thereby making it possible to narrow the gap between adjacent plate members 33. Therefore, there is an advantage that the whole can be made compact, and since the armature of the print head can collide with any part of the upper side of the plate-like member 33, the damping device 32 can be easily positioned when embedding the plate-like member 33 in the damper 31. It has the advantage of being easy to manufacture.

FIG. 11 is an external view of the damping device 34 in the fifth embodiment of the first invention, and FIG. 11 (5) is a plan view, and FIG.
is a longitudinal side view. Although the print head with the damping device 34 attached thereto is not shown, this print head
In the figure, a damping device 34 is attached in place of the damping device 24. In FIG. 11, numeral 36 is a flange pin having a flange 35 at one end of the pin 3°, which corresponds to the pin 30 in FIG. It is a cylindrical case in which holes 38 are arranged parallel to the axis and circumferentially around the axis. In this case, the flanged pin 36 is loosely inserted into the through hole 38 such that the flanged pin 35 is accommodated in the large diameter portion 38b and the pin 30 passes through the small diameter portion 38a. 38, the opening of the large diameter portion 38b of the case 37 is inserted into the disk 1.
It is fixed to the disk 19b with an adhesive so as to be covered by the portion 9b. 39 is interposed between the disc 19b and the collar 35 of the flanged pin 36 in the large diameter portion 38b of the through hole 38, and presses the boxwood 35 against the stepped portion of the through hole 38. A supporting member having elasticity such as rubber,
75 is a damping mechanism consisting of a flanged pin 36 and a support member 39. In this case as well, one flange pin 3
6 and a supporting member 39 corresponding to this pin, the equal image mass of the damping mechanism 75 is a set of operating parts consisting of a set of arm-shaped parts and one print wire in the print head to which the damping device 34 is attached. Since the damping mechanism 75 is formed so as to be equal to the same image mass, such a damping device e34 can have the same function and effect as the damping device 29 in FIG.

FIG. 12 is a partial perspective view of the first embodiment of the second invention;
3 is an external view of the damping device 40 in FIG. 12, and FIG. 13 (5) is a plan view, and FIG. An annular second damping member 4 made of an elastic material such as rubber, disposed on the upper surface of the device and fixed with adhesive.
1, the damping device [40 is composed of the second damping member 41, the damping mechanism 72, the cylinder 28, and the disk 19b.
and a male screw 19a. In the print head of FIG. 12, the damping device 40 is arranged so that the tip of the armature collides with the inertia member 23 immediately before the armature 2 returns to its standby position.
The second damping member 41 is set and arranged using the damping mechanism 7 that is collided with the armature 2.
2 is further arranged and fixed so as to collide with the second damping member 41. In FIGS. 12 and 13, since the print head and the damping device 40 are constructed as described above, the damping mechanism 72 that has been thrown off by the armature 2 is always collided with the second damping member 41 and here. As a result of absorbing the kinetic energy of the damping mechanism 72 in this print head, the damping mechanism 72 comes to a standstill earlier than when the second damping member 41 is not provided, so that the armature 2 comes to a standstill faster than when the second damping member 4 is not present. Therefore, the printing speed of the print head is reduced by the second damping member 41.
This has the effect of making it even faster than without it.

In the embodiment shown in FIGS. 12 and 13, the second
Although the damping member 41 is provided so as to face the damping mechanism 72, the present t42 invention also allows such a second damping member 41 to be provided so as to face the damping mechanism 71 shown in FIG. It is clear that there is.

In each of the embodiments of the first and second aspects of the present invention described above, the inertial member 23, the pin 30, the plate member 33,
Although the tip of the armature 2 collides with any of the flanged pins 36, the present invention is not limited to such a manner of collision, and the armature 2 and the spring portion 1 collide with each other.
There is no problem in causing the collision to occur at any point along almost the entire length of the arm-shaped portion 3 consisting of ,29,32゜3
4.40 is attached to the print head, but in the present invention, the above-mentioned damping devices 24, 25, 29, 32, 34° 40 may be attached to the print head without using such a screw 19a. It's good. Furthermore, while all of the embodiments described above have been directed to spring release type printheads, the invention is also applicable to electromagnetic or piezoelectric type printheads.

〔Effect of the invention〕

As mentioned above, in the first invention, the movable part is
: A damping base consisting of an inertial member having rigidity or viscoelasticity placed opposite the movable part so as to collide with the movable part during operation, and an elastic support member that supports the inertial member individually or continuously. , and the related parts are formed so that the equivalent mass of the damping mechanism corresponding to each inertial member, and the part '' is approximately equal to the equivalent mass of the set of operating parts consisting of the movable part and the printing wire. Therefore, when the movable part collides with a stationary inertial member, the movable part becomes stationary with almost no rebound according to the law of conservation of motion confinement, and this action is performed almost independently of the ambient temperature and the elasticity of the damping mechanism. As a result, there is an effect that the printing speed of the print head can be increased. Further, in the second invention of the present invention, in the print head having a damping mechanism in which the inertial member of the print head according to the first invention is individually supported by an elastic support member,
Further, an elastic @2 damping member made of rubber or the like is provided, and when the movable part collides with the inertial member, the tamping mechanism to which this inertial member is attached collides with the second damping member. With this arrangement, the second damping mechanism brings the damping mechanism to a standstill quickly, and as a result, the movable part comes to a standstill quickly during the return operation, so that the printing speed of the print head can be increased as in the first invention. It can be done quickly and is effective.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional spring release type print head, Figure 2
The figure is a partial plan view of the movable part in Figure 1, and Figure 3 is a partial plan view of the movable part in Figure 1.
FIGS. 4 and 7 are partial perspective views of the armature of the first and second embodiments of the present invention, FIG. figure,
FIG. 8, FIG. 9, FIG. 7A10, and FIG. 11 are external views of damping devices in the first, second, third, fourth, and fifth embodiments of the first invention, respectively, and FIG. (5), Figure 8 (5), Figure 9 (5), Figure 10 (A)
, Figure 11 (A) is a plan view of Izuite, Figure 5 (Bl, Figure 8 (B1), Figure 9 (Bj, Figure 10 (B), and Figure 11 (B) are all longitudinal side views. The figure is: 1. Spring portion, 2. Armature, 3. Arm-like portion, 4.
Supporting part, 5・Movable part, 6... Printing wire, 10 Yoke, 16・Coil, 21, 27 Plate spring, 23・Inertia member, 30・Pin, 31 Damper, 33・Plate member,
36... Pin with collar, 39... Supporting member, 41 Second damping member, 71. , 72°73.74.75
・Damping mechanism. Figure 1 Figure 2 Figure 3 Cause Figure 4 Tumor Figure 5 YcL Figure 7 ts8 Figure 9 Figure Name 10 Figure 11 Figure @ 12 Figure 13 Procedural Amendment Book Erasure 1985 1: Month 2'; Japan Patent Office = (Government - Koji J ~ Gu Yoyu 10 - Display of case Patent application Sho ($2 - Sae 62 person who makes one amendment 1° = relationship with IF case d''' request) residence
Location r::”, -1-Lj,:'lr7 people
Name (b231 εushi, -24 (j, Niai Tsujiaki (n's ri; 1-cho) 7H knee, :] 2m, '++ (-
-: ζ;) (Other names) 19th representative Personal address No. 1 Tanabeshinden, Kawasaki-ku, Kawasaki City) Date of amendment order (・J Showa The following sentence is inserted after "Front view" on page 27, line 1O of the amendment: "Figure 12 is a partial perspective view of the first embodiment of the second invention.
Figure 13 is an external view of the damping device in Figure 12.

Claims (1)

[Scope of Claims] 1) In a print head of a wire dot printer that prints using a printing wire provided in a movable part, there is provided a support member having elasticity, and the movable part is supported by the support member and has a return operation. a damping mechanism including an inertial member disposed opposite to the movable part so as to collide with the movable part when the damping mechanism collides with the movable part; A print head for a wire dot printer, characterized in that the equivalent mass of a working part consisting of a print wire is approximately equal. 2) In a print head of a wire dot printer that prints using a printing wire provided in a movable part, the number of inertia members equal to the number of movable parts and an elastic beam configured to individually fix and support the inertia members at one end are provided. a damping mechanism consisting of a supporting member; a second damping member having elasticity; The second damping member is formed to have a mass substantially equal to the mass of the second damping member, and is arranged so that the movable member collides with the inertial member when the movable member performs a return operation, and the second damping member is formed such that the movable member A print head for a wire dot printer, characterized in that the damping mechanism is arranged opposite to the damping mechanism so that the damping mechanism collides with the second damping member when the print head collides with the second damping member.