JPS6351366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trigger electromagnet for a small printer.

A conventional device of this type will be explained with reference to FIGS. 1 and 2. FIG. 1 is a perspective view and FIG. 2 is a side sectional view. The magnetomotive force obtained when the coil 12 wound around the coil frame 11 is energized by the trigger signal is generated by the fixed iron core 14 forming a magnetic circuit,
A spacer 19 made of a non-magnetic material attracts the movable iron core 15 in the direction of arrow A through the yoke plates 131 and 132.
Complete the suction. The movable iron core 15 is fitted with the suction plate 16 and rotates around the shaft 21,
The suction plate 16 has a hole 164 and engages with the trigger transmission member 20 to drive it. After the trigger signal is cut off, the movable iron core 15 returns in the direction of arrow B by the trigger spring 17 that engages with the suction plate 16, and the movable iron core 15 returns to the direction of arrow B by the trigger spring 17, which is screwed to the yoke plate 132.
When the suction plate 16 hits the tip 221 of the suction plate 16, positioning during standby is performed.

Conventional trigger electromagnets having such a structure and operation have the following drawbacks. The suction plate 1
6 returns in the direction of arrow B by the trigger spring 17 and collides with the tip 221 of the trigger 22, the collision energy causes the suction plate 16 to repel again in the direction of arrow A, driving the trigger transmission member 20 as if by the trigger signal. This may cause the trigger to malfunction. In a trigger electromagnet with a conventional structure, it is necessary to attach a member such as rubber with a buffering capacity to the tip 221 of each trigger point 22 in order to absorb the collision energy, which increases the number of parts and assembly man-hours, and reduces durability. This had the disadvantage of being an expensive trigger electromagnet that lacked performance and operational stability.

The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide an inexpensive trigger electromagnet that does not increase the number of parts, has good assembly workability, is durable, has a buffering function, and has stable operation. be.

That is, in order to achieve such an object, the present invention provides a trigger electromagnet for a small printer operated by a trigger signal, which includes a yoke plate having a recess formed at one end, and a fixing member having one end magnetically coupled to the yoke plate. An iron core, a coil frame around which a coil is wound and fitted into the fixed iron core, and an engagement having a notch that fits into the recess of the yoke plate and rotatably abuts and engages with the yoke plate. a movable iron core that is fixed to the suction plate and faces the fixed iron core and rotates the suction plate by being attracted to the fixed iron core, one end of which is supported by the yoke plate; The other end is supported by the suction plate, and the suction plate is pressed against the yoke plate by a spring force, and the suction plate is rotated about the engaging portion in the return direction away from the fixed iron core. a spring member disposed at a position away from the engaging portion of the suction plate in the direction in which the movable iron core is disposed and facing a portion near one periphery of the suction plate when the suction plate returns; a stopper member that engages with the suction plate, and the suction plate is configured such that the other end of the suction plate floats up from the yoke plate due to the spring force of the spring member when the suction plate engages with the stopper member. A trigger electromagnet for a small printer is characterized by this.

A specific example of the present invention will be described below with reference to the drawings. 3 and 4 are perspective views of one specific example of the present invention, and FIG. 5 is a side sectional view of the center of rotation of the suction plate. The trigger point 18 utilizes the elastic deformation of the piece 111 protruding from a part of the plastic coil frame 11 in the direction of arrow C, and inserts the piece 111 of the coil frame 11 into the hole 181 provided in the trigger point 18. By this, the piece 111 and the yoke plate 13
It can be easily attached between 1 and 1. Furthermore, the point 161 where the tip 182 of the trigger point 18 contacts the suction plate 16 is the rotation center axis 2 of the conventional suction plate 16.
1 and is away from the position passing through the center of gravity of the suction plate 16 and the movable iron core 15 fixed to the suction plate 16. Further, the center of rotation of the suction plate 16 during suction is not the shaft 21, but the suction plate 16 and the yoke plate 13.
1 is a tangent line 165 formed by being pressed in the direction of arrow D by the trigger spring 17, and if the force of the trigger spring 17 is resisted, the suction plate 16 will move against the yoke plate 131.
The suction plate 16 can be moved away from the yoke plate 131 in the direction of arrow E, and the suction plate 16 is prevented from coming off vertically by sandwiching the top and bottom of the yoke plate 131 with notches 166 and 167. A state where the movable iron core is attracted in the direction of arrow A, and the suction plate 16 and the trigger degree are 1
In the return state in the direction of arrow B until the trigger point 8 comes into contact, the center of rotation is only different from the conventional one, but the shock absorbing mechanism after the collision between the suction plate 16 and the trigger point 18 will be described below. After the suction plate 16 collides with the trigger point 18, the contact area between the two is located at point 1, which is off the center of gravity of the suction plate 16 and the movable iron core 15, as described above.
61, as shown in FIG. 4, the kinetic energy of the suction plate 16 and the movable iron core 15 up to that point is approximately perpendicular to the direction of movement up to that point, with the point 161 and one end 162 of the tangent 165 as fulcrums. The suction plate 16 is rotated in the direction of arrow F. In other words, the opposite end 163 of one end 162 of the tangent 165 is pushed out in the direction of arrow E. At this time, the slight elongation of the trigger spring 17 and the friction between the notch 167 of the suction plate and a part of the yoke plate 131 produce an extremely good energy absorption effect, making it more stable and durable than conventional shock absorbers. Furthermore, the force of the trigger spring 17 involved in energy absorption is determined by the position (a) of the engaging portion 168 of the suction plate 16 and the trigger spring 17, and the fulcrums 161, 162.
The position (b, c) of the suction plate 16 and the movable iron core 1
The force of the trigger spring 17 required for the return time of 5 can be freely selected. Furthermore, the trigger transmission member 20
The kinetic energy can also be absorbed by a free load due to the position (d) of the engagement hole 164 with the suction plate 16. After the collision energy is sucked in the state shown in FIG. 4, the force in the direction of arrow D of the trigger spring 17 returns to the state shown in FIG. 3, and the next suction is not affected at all.

As described above, according to the present invention, the movable iron core is located at a position away from the abutting and engaging portion of the suction plate with the yoke plate in the direction in which the movable iron core is attached, and facing a portion of the suction plate near one of the peripheries. Since the abutment member is provided which engages the suction plate when the suction plate returns, the other end of the suction plate rises from the yoke plate due to the spring force of the spring member when the suction plate engages with the abutment member, causing Since the force is weakened, the vibration of the suction plate can be quickly suppressed, and the bouncing phenomenon of the suction plate can be quickly absorbed, and the collision noise generated when the suction plate collides with the percussion member is small, making it possible to obtain an electromagnet with stable operation. .

[Brief explanation of the drawing]

1 and 2 are a perspective view and a side sectional view, respectively, illustrating a conventional device. FIGS. 3 and 4 are a perspective view and a side sectional view showing a specific example of the present invention. It is. 11... Coil frame, 131, 132... Yoke plate, 14... Fixed iron core, 15... Movable iron core, 16
. . . Suction plate, 17 . . . Trigger spring, 18 . . . Trigger degree according to the present invention, 22 . . . Trigger degree of the conventional device.

Claims (1)

[Claims] 1. A trigger electromagnet for a small printer that is activated by a trigger signal includes: a yoke plate with a recess formed at one end, a fixed iron core with one end magnetically coupled to the yoke plate, and a coil. A suction device comprising: a coil frame wound and fitted into the fixed iron core; and an engaging portion having a notch that fits into the recess of the yoke plate and rotatably abutting and engaging with the yoke plate. a movable iron core that is fixed to the suction plate and faces the fixed iron core and rotates the suction plate by being attracted to the fixed iron core, one end of which is supported by the yoke plate and the other end of which is supported by the suction plate; a spring member which is supported by a plate and which presses the suction plate against the yoke plate by a spring force and rotates the suction plate about the engaging portion in a return direction in which the suction plate moves away from the fixed iron core; The movable iron core is disposed at a position away from the engaging portion of the suction plate in the direction in which the movable iron core is disposed and facing a portion near one periphery of the suction plate, and is connected to the suction plate when the suction plate returns. and a perpendicular member that engages with the perpendicular member, and the suction plate is configured such that the other end of the suction plate floats up from the yoke plate due to the spring force of the spring member when the suction plate engages with the perpendicular member. Trigger electromagnet for a small printer.