JPH03371Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to an improvement of a wire holding device for a wire dot printer.
The present invention relates to an improvement of a wire holding device for a wire dot printer in which a magnetic arm is held directly by a leaf spring.

``Prior Art'' Conventionally, the wire holding device of this type of wire dot printer has the rear end of a plate spring brazed to a fixed base, the rear end of a magnetic arm to the tip of the plate spring, and the wire holding device of this type of wire dot printer. The rear end of a hollow arm is brazed to the tip of the magnetic arm, and the base of a wire is brazed to the tip of the hollow arm.

``Problem that the invention seeks to solve'' Therefore, the wire holding device of the conventional wire dot printer of this type requires assembling many small parts by brazing, and the manufacturing requires skilled workers. It is known to have the drawback of requiring manual labor.

In particular, when these parts are placed in the high-temperature atmosphere required for brazing, the hollow arms are made of extremely thin material to reduce weight, so they may be deformed by heating, oxidized or carbonized, and lose their intended strength. In addition, there is a need to use wires with extremely small diameters, which can be annealed and deformed under high heat, which is a major hindrance to maintaining the performance of wire dot printers.

SUMMARY OF THE INVENTION The present invention was devised to solve the above-mentioned drawbacks, and an object of the present invention is to provide a wire holding device for a wire dot printer that is easy to manufacture and provides uniform performance.

``Means for Solving the Problems'' In line with the above-mentioned purpose, the structure of the present invention, whose gist is the scope of the above-mentioned utility model registration claim, is that a fixing base 10 having a screw hole 12 into which the fixing screw 6 is screwed is mounted horizontally. A concave groove 11 in the direction is provided, and the fixing base 10
The plate spring 20 is fixed by fitting the rear end into the groove 11 and brazing it, and the tip of the plate spring 20 has a receiving piece portion which receives the entire width of the plate spring 20 at the lower part of the rear end. A vertical plate-shaped magnetic arm 30 having a protruding portion 32 protruding from an upper portion 31.
The tip of the leaf spring 20 is fitted between the receiving piece 31 and the protrusion 32 and fixed by brazing, and the tip of the magnetic arm 30 has two folded side surfaces 41, 41. Upper surface 42 bent at right angles
The upper surface 42 and the lower surface 43 are connected to form a hollow box shape, and the upper surface 42 and the lower surface 43 have a notch 44 on the folded end side.
44, and the tip of the magnetic arm 30 is inserted and soldered between the protrusions 45, 45 that protrude from the rear ends of both side surfaces 41, 41 to the upper and lower center portions of both sides of the magnetic arm 30. Further, the wire 50 is attached to the folded end portion of the hollow arm 40, and the base portion thereof is attached to the cutout portions 44, 44.
A technical measure has been taken in which the wire is inserted into the inner wall and fixed by soldering.

``Operation'' Therefore, the wire holding device of the wire dot printer of the present invention can manufacture the hollow arm 40 and the wire 50 without placing them in a high temperature atmosphere for brazing. Soldering has the disadvantage of being inferior in strength compared to brazing, but according to the inventor's prototype tests, the external force normally applied to the connection between the tip of the hollow arm 40 and the base of the wire 50 is the highest impact force during printing. Since it is large, there is no need to worry about soldering strength, and the external force normally applied to the connection between the rear end of the hollow arm 40 and the tip of the magnetic arm 30 is due to the weight of the hollow arm 40 and the wire 50. The corresponding inertial stress is the largest, and the hollow arm 40 is made into a hollow box shape to reduce the weight and reduce the inertial stress, and the protruding portions 45,
45 are protruded from the upper and lower center portions of both sides of the magnetic arm 30 and the soldering distance is increased to maintain strength, so that sufficient strength for practical use can be obtained.

``Example'' Next, an example of the present invention will be described below with reference to the accompanying drawings.

In the figure, numeral 10 denotes a fixing base fixed to the lid 2 of the dot drive mechanism case 1. This fixing base 10 has a screw hole 12 into which the fixing screw 6 is screwed, and a horizontal groove 11.
The screw hole 12 is perpendicularly opened in the horizontal part 10a of the fixing base 10, and the fixing base 10 is screwed onto the lid 2 by a fixing screw 6 passing through the lid 2. Further, the groove 11 is arranged on the inner side surface of the downwardly bent portion 10b at one end of the horizontal portion 10a.

A leaf spring 20 is fixed to the fixing base 10 by fitting its rear end into the groove 11 and brazing it. The concave groove 11 is provided over the entire width of the horizontal portion 10a with a width that allows the plate spring 20 to be inserted with some clearance, and the brazing material R can flow into the clearance. It has been done.

At the tip of the leaf spring 20, there is attached a magnetic arm 30 in the form of an upright plate, which has a receiving piece 31 at the lower part of the rear end for receiving the entire width of the leaf spring 20, and a protruding part 32 at the upper part. The tip of the leaf spring 20 is fitted between the receiving piece 31 and the protrusion 32 and fixed thereto by brazing. The magnetic arm 30 may be integrally formed using an appropriate magnetic material, preferably a magnetic material with low residual magnetism. Further, both side surfaces of the tip of the magnetic arm 30 have notches 33, 33 corresponding to the thickness of the protrusions 45, 45, which will be described later, and stepped portions 3 on the top and bottom surfaces.
The cutout portions 33, 33 prevent the protruding portions 45, 45 from protruding to both sides of the magnetic arm 30, and the step portions 34, 34 prevent the magnetic arm 30 and the hollow arm 40 described below. It has come to be used for mutual insertion positioning with.

Further, at the tip of the magnetic arm 30, an upper surface 42 and a lower surface 43 which are bent at right angles are connected to both side surfaces 41, 41 which are folded in half to form a hollow box shape. A hollow arm 40 having notches 44, 44 on the folded end side.
A protruding portion 4 protrudes from the rear end of both side surfaces 41, 41 to the upper and lower center portions of both sides of the magnetic arm 30.
The tip of the upright plate-shaped magnetic arm 30 is inserted between 5 and 45 and fixed by soldering. Since the protrusions 45, 45 are soldered instead of the conventional brazing, it is necessary to increase the soldering distance to increase the strength.
Both upper and lower sides of the magnetic arm 30 are positioned on the side surface of the tip end of the magnetic arm 30. Note that this protrusion 4
5 and 45 have a square shape, but unlike the illustrated example, they may be semicircular, or the rear end side may be made uneven to further lengthen the soldering distance.

Further, a wire 50 is attached to the folded end portion of the hollow arm 40, and the base portion thereof is attached to the cutout portions 44, 44.
Insert it inside and solder it into place.

Note that 3 in the figure is an iron core placed below the magnetic arm 30, and this iron core 3 is attached to the dot drive mechanism case 1.
Together, they form a magnetic circuit for the permanent magnet 4, and the magnetic arm 30 is normally magnetically attracted to the top surface of the iron core 3 against the biasing force of the leaf spring 20. Further, a coil 5 is disposed on this iron core 3, and when this coil 5 is energized, the iron core 3 is excited to have a polarity opposite to that of the permanent magnet 4, and a magnetic arm 30 formed by the iron core 3
The force that attracts the magnetic arm 30 is reduced or eliminated, and the magnetic arm 30 moves toward the stopper 13 (upward in the figure) due to the biasing force of the leaf spring 20.

[Effect of the invention] The wire holding device of the wire dot printer of the present invention has the above-described configuration, and the magnetic arm 30 and the hollow arm 40 are fixed together, and the hollow arm 40 and the wire 50 are fixed by soldering. , the hollow arm 40 made of a thin material and the small diameter wire 50 can be fixed without being placed in an extremely high temperature atmosphere, and the material can be oxidized, carbonized, or
Deformation can be prevented. Especially hollow arm 4
Since the hollow arm 40 is not in the shape of a hollow box, its own weight is small and the inertial stress is small, and the hollow arm 40
Since long distance soldering is performed using the protrusions 45, 45, sufficient strength can be obtained by soldering.

In addition, in the present invention, the rear end of the leaf spring 20 is fitted into the groove 11, and the tip is fitted and brazed between the receiving piece 31 and the protrusion 32, so that the connection and fixation strength of this part is sufficient. This makes it possible to improve the strength of the connection between the tip of the leaf spring 20 and the magnetic arm 30, which has caused the most accidents in conventional wire holding devices of this type of wire dot printer, and to fix the connection using simple soldering. It is possible to provide a wire holding device for a wire dot printer that is less prone to damage as a whole regardless of the means used.

[Brief explanation of the drawing]

FIG. 1 is a front view of the wire holding device of the wire dot printer of the present invention, and FIG. 2 is an exploded perspective view of the parts. 6... Fixing screw, 10... Fixing base, 11... Concave groove, 12... Screw hole, 20... Leaf spring, 30... Magnetic arm, 31... Receiving piece part, 32... Protrusion part,
40...Hollow arm, 41...Both sides, 42...
Upper surface, 43... Lower surface, 44... Notch, 45...
Protrusion, 50...Wire.

Claims (1)

[Claims for Utility Model Registration] A fixing base 10 having a screw hole 12 into which a fixing screw 6 is screwed is provided with a horizontal concave groove 11.
The plate spring 20 is fixed by fitting the rear end into the groove 11 and brazing it, and the tip of the plate spring 20 has a receiving piece portion which receives the entire width of the plate spring 20 at the lower part of the rear end. A vertical plate-shaped magnetic arm 30 having a protruding portion 32 protruding from an upper portion 31.
The tip of the leaf spring 20 is fitted between the receiving piece 31 and the protrusion 32 and fixed by brazing, and the tip of the magnetic arm 30 has two folded side surfaces 41, 41. Upper surface 42 bent at right angles
The upper surface 42 and the lower surface 43 are connected to form a hollow box shape, and the upper surface 42 and the lower surface 43 have a notch 44 on the folded end side.
44, and the tip of the magnetic arm 30 is inserted and soldered between the protrusions 45, 45 that protrude from the rear ends of both side surfaces 41, 41 to the upper and lower center portions of both sides of the magnetic arm 30. Further, the wire 50 is attached to the folded end portion of the hollow arm 40, and the base portion thereof is attached to the cutout portions 44, 44.
A wire holding device for wire dot printers that is inserted into the wire and fixed by soldering.