JPS603995B2 - Printing hammer mechanism - Google Patents

Description

[Detailed description of the invention] The present invention relates to a print hammer mechanism for a printer.

A conventional printing hammer mechanism consisting of a drive magnet mechanism including an armature and a clapper-type magnet that attracts and rotates the armature, and a hammer mechanism including a hammer driven by the armature can efficiently drive the hammer. Printing machines that require large printing pressure, such as hitting the matrix type, are often used, but since the drive magnet mechanism and the hammer mechanism are mounted separately, a large mounting space is required, and it is difficult to optimize the printing operation. In order to obtain this, the installation position of the hammer mechanism is adjusted, but at this time the movable range of the armature also changes, so the drive magnet mechanism must be adjusted so that the armature's movable range becomes the optimum movable range. did not become. Furthermore, since the detection mechanism for detecting the overstroke of the hammer is also mounted separately, there is a drawback that the mounting space is further increased. In order to eliminate the above drawbacks, the present invention provides a printing hammer mechanism that integrates a drive magnet mechanism, a hammer mechanism, and a detection mechanism for detecting overstroke of the hammer, and will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a front view of the embodiment in FIG. 1, and FIG. 3 is a sectional view taken along line AA' in FIG. 2.

In the figure, 1 indicates a coil 2, a hollow core 3, and a yoke 4.
5 is an armature (see FIGS. 5 and 6); 6 is an armature holder attached to the drive magnet 1 and rotatably supports the armature 5; 7 is an armature reset spring;
8 is an inertia damper 8a attached to the armature holder 6, a lock nut 8b for attaching the inertia damper 8a to the armature holder 6, a first damper member 8c held by the inertia damper 8a, and the armature holder 6. and an armature stopper consisting of a second damper jaw 8b inserted between the lock nut 8b and a third damper material 8e glued to the tip of the inertia damper 8a, and 9 has a fourth damper material on the head as shown in FIG. 9a is attached to the drive magnet 1 with a hammer having a through hole 9b in the center.
The hammer reset spring 1 is slidably inserted into a guide hole which is disposed in the core 3 and penetrates in all directions, and is biased to the stop position by a hammer reset spring 1 which is also inserted into the core 3.

Reference numeral 11 denotes a fifth damper member attached to the drive magnet 1 facing the armature 5 (see FIGS. 7 and 8).
, 12 is a guide that is attached to the driving magnet 1 and has a guide hole penetrating in the direction of the ball to guide the hammer 9; A light-emitting diode and a light-receiving diode Z are buried so as to cooperate in the provided area, 14 is a mounting screw for fixing the drive magnet to the frame amount 6, and 15 is a stopper for fixing the armature holder 6 to the drive magnet 1. It's a screw.

Note that the frame 16 is shown to facilitate understanding of the present invention, and does not constitute the second printing hammer mechanism according to the present invention. The operation in the above configuration will be explained.
First, when the coil 2 is energized for a predetermined period of time, an attractive force is generated between the core 3 and the armature 5, and the armature 5 rotates counterclockwise using the point of contact with the yoke 4 as a fulcrum. This armature 5 presses and drives the hammer 9 via a fourth damper member 9a attached to the head of the hammer 9, and then
It collides with the damper material 11 and then returns due to the rebound force and the biasing force of the armature reset spring 7 and collides with the armature stop 3 part 8 and stops. At this time,
The third damper material 8e of the armature stopper 8 absorbs the collision, and then the inertia damper 8a absorbs the first damper material 8c,
Since the shock is absorbed through the second damper material 8d, the vibrations of the armature 5 and hammer 9 are quickly attenuated 3 and noise is reduced. Further, the hammer 9 driven by the armature 5 flies freely due to inertia, collides with type, printing paper, or an ink ribbon (not shown) and is bounced back. Due to strange circumstances, he is reinstated. This hammer 9 collides with the armature 5 and stops, but at this time, the fourth hammer 9
Since the damper material 9a collides, vibration noise is small. Further, when the hammer 9 driven by the armature 5 overstrokes due to breakage or wear of the unillustrated type, the through hole 9b of the hammer 9 faces the light emitting diode 13a and the light receiving diode 13M,
Luminous evening... The light emitted from the diode 13a passes through this through hole 9b.
The light passes through and is received by the light receiving diode 13b. When light hits the light receiving diode 13b, the resistance value changes, so this change is converted into an electrical signal by a detection circuit (not shown).
An alarm signal or a print operation stop signal can be obtained. As mentioned above, the detection mechanism for detecting the overstroke of the hammer 9 is embedded in a region provided in a predetermined space of the guide 12 and formed integrally with the drive magnet. The spatial region in which the device operates is an open space, ensuring reliable cooperation without being influenced by external disturbances, and furthermore, the mounting space can be reduced. In addition, by moving the armature holder 6 with the setscrew 15 and adjusting the position of the armature stopper 8, the movable range of the armature 5 can be optimally adjusted in advance. 14 to attach yoke 4 to frame 1
Even if the movable range of the hammer 9 is adjusted by changing the mounting position of the hammer 9, the movable range of the armature 5 does not change. Therefore, adjustment is easy. Holder 6
, a drive magnet mechanism consisting of an armature reset spring 7, an armature stopper 8, and a fifth damper member 11, the hammer 9, and a hammer reset spring 10.
Since it is assembled integrally with the hammer mechanism consisting of the guide 12 and the guide 12, the mounting space can be reduced. In particular, in the above embodiment, since the hammer 9 is housed within the core 3, the mounting space can be significantly reduced. Note that the present invention is not limited to the above-mentioned embodiments. For example, the shapes of the hammer 9, armature 5, drive magnet, etc. can be changed, or the hammer 9 can be provided outside the core 3, and the light emitting diodes 13a and The light receiving diode 13b can also be replaced with other detection elements such as a magnet and a Hall element. As described above in detail, according to the present invention, it is possible to obtain a printing hammer mechanism that integrates a drive magnet mechanism, a hammer mechanism, and a detection mechanism for detecting overstroke of the hammer, and also to reduce the mounting space. This has the effect of making adjustment easier.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a front view of the embodiment shown in Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a hammer. , FIGS. 5 and 6 are a plan view and a side view of the armature, and FIGS. 7 and 8 are a plan view and a side view of the fifth damper member. 1...Kuratupa type magnet, 2...・Coil, 3...core, 4...yoke, 5...armature,
6... Armature holder, 7... Armature reset spring, 8... Armature stopper, 9... Hammer, 10 Hammer reset spring, 11... Fifth damper material, 12... Guide, 13a ...Light emitting diode, 13b... Light receiving diode, 14...
...Mounting screw, 15... Set screw. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A driving magnet mechanism including an armature and a clapper-type magnet that attracts the armature is provided with a guide hole passing through it in the axial direction, and a hammer driven by the armature can slide in the guide hole in the axial direction. In such a printing hammer mechanism, a detection means for detecting an overstroke of the hammer is provided opposite the tip of the guide hole, a detection means is provided on the hammer, and a stopper is provided for regulating the movable range of the armature to a predetermined amount. 1. A printing hammer mechanism characterized in that: is arranged in an armature holder, and the armature holder is fixed to a drive magnet mechanism.