JPH0431061A - Impact head - Google Patents

Abstract

PURPOSE:To make an impact head having high durability and high magnetic efficiency manufacturable at low cost by a method wherein a nonmagnetic layer is integrally formed by sintering to the surface of a core to which a lever is attracted, or a member having high abrasion resistance is integrally formed by sintering to the surface whereon sliding is applied. CONSTITUTION:Electric current is selectively applied to a driving coil 7 with printing data transmitted, and a magnetic flux is produced in a magnetic circuit formed of a core 1, a frame 2, a yoke 8, a side yoke 9, and a lever 10. Thereby the lever 10 is driven, giving impetus to a printing wire 12 that is engaged to one end of the lever 10, and thereby printing is made. As formation of a nonmagnetic layer 3, excellent in abrasion-resistivity, is made integrally to a drawing surface 1a of the core 1, the thickness and capacity of the nonmagnetic layer 3 become respectively uniform, and thereby the behavior of the lever 10 is stabilized, reducing abrasion that occurs when colliding with the cord. Thereby durability of the title device can be greatly improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an impact head.

[Prior Art] Conventional impact heads generally use laminated polyimide sheets or non-magnetic plating on the surface of the core that absorbs the lever in order to improve the cutting of residual magnetic flux.

Additionally, surface treatments such as plating were generally used on sliding surfaces to increase wear resistance.

[Problems to be Solved by the Invention] However, when polyimide sheets are laminated on the surface of the core that absorbs the lever in this way, a polyimide sheet must be placed for each core, which causes assembly problems such as misalignment. Not only is it significantly worse, but it also creates an air gap between the polyimide sheet and the core, reducing magnetic efficiency.

Furthermore, when the sliding surface is subjected to a surface treatment such as wear-resistant plating, the entire member having the sliding surface is plated, which reduces the magnetic efficiency of the parts constituting the magnetic circuit other than the sliding surface. Also, the cost was increased by plating the entire member.

The present invention has been made in view of these problems, and its purpose is to form a non-magnetic layer at low cost without reducing magnetic efficiency, and to improve magnetic efficiency at low cost. It is an object of the present invention to provide an impact head having excellent durability performance by forming a member having excellent wear resistance only on the sliding surface without degrading the wear resistance.

[Means for Solving the Problems] The in-pack head of the present invention includes a printing wire, a lever for driving the printing wire, a driving coil for magnetically driving the lever, and a magnetically attracting the lever. The impact head is constituted by a frame having a core, and is characterized in that a nonmagnetic layer is integrally formed by sintering on the surface of the core that attracts the lever.

Also, a printing wire, a lever for driving the printing wire,
Consisting of a drive coil that magnetically drives the lever, a frame having a core that magnetically attracts the lever, and a yoke that cooperates with the lever to form part of a magnetic circuit and guide the lever. This impact head is characterized in that a member having excellent wear resistance is integrally formed on the sliding surface by sintering.

Also, a printing wire, a lever for driving the printing wire,
A frame having a drive coil that magnetically drives the lever, a core that magnetically attracts the lever, a fulcrum shaft that serves as a pivot point for the lever, and a part of a magnetic circuit that cooperates with the lever. The impact head is configured with a side yoke that guides the fulcrum shaft, and is characterized in that a member having excellent wear resistance is integrally formed on the sliding surface by sintering.

[Example] The details of the present invention will be explained below based on the disclosed example.

FIG. 1 is an exploded perspective view of an impact head showing an embodiment of the present invention, and FIG. 2 is a side sectional view of the same device. It is positioned with the outer circumference of the holder 5 and further positioned with the hole in the frame 2. frame 2
is for attracting the lever 10 in cooperation with the yoke 8 and the side yokes 9, and has a ring-shaped core 1 protruding from its inner surface around which a driving coil 7 is wound. York 8
A radial slit through which the lever 10 can swing is formed in the plate surface of the side yoke 9 and the plate surface of the side yoke 9, and the fulcrum shaft 14, which serves as a swing fulcrum of the lever 10, is held by this slit. .

By the way, the above-mentioned lever 10 is for printing with a printing wire 12 fixed at the tip by swinging around a fulcrum shaft 14, and is pressurized by a return spring 6, and is a lever holder having a stopper 15. It is assembled so as to be held at the standby position at 16.

17 is a fixing spring for fixing the above parts, and the nose 4
It is arranged so that positioning and fixing can be performed by inserting the convex part into the hole of the fixing spring 17.

Here, in order to accelerate the disappearance of the residual magnetic flux that occurs after the end of energization of the drive coil 7 on the surface 1a of the core 1 that attracts the lever 10, and to increase the wear resistance in the event of a collision due to attraction between the core 1 and the lever 10. , a nonmagnetic layer 3 is provided. The nonmagnetic layer 3 is made of, for example, ceramics, N1-P, C1 nitride, austenite layer metal, Ti-N, etc., and the core 1 is made of pure iron, silicon steel, permendur, etc. A non-magnetic layer 3 is laminated on the attraction surface 1a of the core 1 and integrated by sintering. Furthermore, the non-magnetic layer 11 may be formed on the sucking surface 10a of the lever 10 by a similar method.

Next, the operation of the device configured in this way will be explained. When the print data is sent, a current is selectively applied to the drive coil 7, and magnetic flux is generated in the magnetic circuit constituted by the core 1, frame 2, yoke 8, side yoke 9, and lever 10, and drives the lever 10. Then, the printing wire 12 engaged with one end of the lever 10 is energized to print.

Here, since a non-magnetic layer 3 is integrally formed on the attraction surface 1a of the core 1, which speeds up the breakage of the residual magnetic flux and has excellent wear resistance, the thickness and performance of the non-magnetic layer 3 are becomes uniform, the behavior of the lever 10 can be stabilized, and wear during a collision can be reduced, so durability is greatly improved.
By forming , the above effect becomes even more pronounced.

FIG. 3 is a diagram showing another embodiment of the present invention, in which a member 18 having excellent wear resistance is provided on the surface 8a of the yoke 8 that guides the lever 10.
is the provision. The member 18 having excellent wear resistance is made of ceramics, N1-PS C1 nitride, Ti-N, etc., the yoke 8 is made of pure iron, silicon steel, permendur, etc., and the lever 10 of the yoke 8 is made of Surface 8a that guides
A member 18 having excellent wear resistance is laminated on the top and is integrated by sintering.

Further, a member 18 having excellent wear resistance may be laminated on the sliding surface 10b of the lever 10 with respect to the yoke 8 in a similar manner, and then integrated by sintering.

Since the member 18 with excellent wear resistance is disposed on the sliding surface that guides the lever 10 and is integrated with the yoke 8 by sintering, the bonding strength is strong and problems such as peeling, shifting, and cracking can occur. Since the clearance between the lever 10 and the yoke 8 can be made constant without causing any problems, and the behavior of the lever 10 can be stabilized over a long period of time, durability can be significantly improved.

Further, by forming a similar member 13 having excellent wear resistance on the sliding surface 10b of the lever 10, the above-mentioned effect is further enhanced.

FIG. 4 shows another embodiment of the present invention, in which a member 19 having excellent wear resistance is provided on a surface 9a of the side yoke 9 that guides the fulcrum shaft 14. The member 19 having excellent wear resistance is made of, for example, ceramics, NiP, C1 nitride, Ti-N, etc., and the side yoke 9 is made of pure iron, silicon steel, permendur, etc., and the fulcrum of the side yoke 9 is A member 19 having excellent wear resistance is laminated on the surface 9a that guides the shaft 14, and is integrated by sintering.

In this way, the member 19 with excellent wear resistance is disposed on the sliding surface that guides the fulcrum shaft 14, and is integrated with the side yoke 9 by sintering, so the bonding force is large and there is no possibility of peeling, misalignment, cracking, etc. Since the fulcrum shaft 14 can be guided without causing any problems, the behavior of the lever 10 that is rotated by the fulcrum shaft 14 can be stabilized over a long period of time, and the durability can be significantly improved. As described above, according to the present invention, a non-magnetic layer is integrally formed on the surface of the core that attracts the lever by sintering, or a member with excellent wear resistance is formed only on the sliding surface by sintering. Since it is integrally formed, an impact head with high magnetic efficiency and excellent durability can be realized at low cost.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an impact head showing one embodiment of the present invention, Fig. 2 is a side sectional view of an impact head showing one embodiment of the invention, and Fig. 3 is a yoke and a yoke showing another embodiment. A sectional view of the lever, and FIG. 4 is a sectional view of a side yoke and a fulcrum shaft showing another embodiment. 1... Core 1a... Surface that attracts the lever of the core 2... Frame 3... Non-magnetic layer of the core 7... Drive coil 8... Yoke 8a... Guides the lever of the yoke Surface 9... Side yoke 9a... Surface 10 that guides the fulcrum shaft of the side yoke
... ) (-0a... Lever's suction surface Ob... Lever's surface guided by the yoke 1... Lever's non-magnetic layer 2... Printing wire 3... Lever's wear resistance Member 4 with excellent wear resistance...Fully shaft 8...Member 9 with excellent wear resistance integrally formed on the yoke...Member agent with excellent wear resistance formed integrally on the side yoke Patent attorney Kizobe Suzuki and 1 other person Figure 2

Claims (3)

[Claims] (1) In an impact head configured of a frame including a printing wire, a lever that drives the printing wire, a drive coil that magnetically drives the lever, and a core that magnetically attracts the lever, the core An impact head characterized in that a nonmagnetic layer is integrally formed by sintering on the surface that attracts the lever. (2) A frame having a printing wire, a lever that drives the printing wire, a driving coil that magnetically drives the lever, a core that magnetically attracts the lever, and a frame that cooperates with the lever to magnetically attract the lever. An impact head comprising a yoke forming a part of a circuit and guiding the lever, characterized in that a member having excellent wear resistance is integrally formed on the sliding surface by sintering. (3) A frame having a printing wire, a lever that drives the printing wire, a drive coil that magnetically drives the lever, a core that magnetically attracts the lever, and a frame that serves as a swinging fulcrum for the lever. In an impact head composed of a fulcrum shaft and a side yoke that cooperates with the lever to form part of a magnetic circuit and guide the fulcrum shaft, a material with excellent wear resistance is sintered on the sliding surface. An impact head characterized by being integrally formed.