JPH037164Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a wire dot printer head using an electromagnet.

[Prior Art] Conventionally, various structures have been considered for wire dot printer heads. In particular, a wire dot printer head attracts a movable iron piece using the attractive force of an electromagnet and engages with the movable iron piece using the movement. In recent years, many structures have been proposed for dot printer heads in which printing wires protrude.

The structure described in Japanese Patent Publication No. 55-27860 is a structure for adjusting the variation in the gap between the suction surface of the movable iron piece and the fixed iron core suction surface of the electromagnet during standby, which is a common drawback of these printer heads. This has been proposed by inserting an adjustment screw into the center of a lid attached to the print head body and screwing it into the body, and changing the gap between the fixed core of the electromagnet fixed to the body and the movable iron piece to adjust the gap. Since the structure adjusts for variations in the electromagnets, unless all the fixed positions of the electromagnets are the same, it is not possible to uniformly adjust the gap between each movable iron piece.

[Problems to be Solved by the Invention] An object of the present invention is to provide a dot printer head that can provide sufficient printing quality with uniform density.

[Means for Solving the Problems] The means of the present invention includes providing a bracket and a wire guide on the print head body, arranging a plurality of electromagnets in a ring shape, and connecting each electromagnet between the bracket and the substrate attached to the print head body. A rubber ring is inserted into the electromagnet, and each movable iron piece that touches the base end of the printing wire inserted through the wire guide is arranged radially opposite each fixed iron core, and the tips of all the movable iron pieces are attached to the printing head body. The lid is brought into contact with the protrusion at the center of the inner surface of the lid, and the lid and the bracket are connected through a plurality of adjusting screws arranged concentrically.

[Embodiment, operation] In the figure, reference numeral 1 denotes a bracket of a print head body 5, in which a plurality of electromagnets 2 are arranged in a ring shape, and the fixed iron core 2a at the center is moved by the movable iron piece 3 by the excitation action of the electromagnets.
It is designed to attract. The printing wires 4 are arranged so as to be oriented toward the tip guide 7 by a plurality of intermediate guides 6 that lock the trunk of the head body 5, and the printing wires 4 are arranged in a line in the vertical direction by the tip guide 7. has been done. That is, the printing wire 4 is inserted through the tip guide 7, intermediate guide 6, and base end guide 8 of the printing head main body 5, which are integrated with the printing head main body 5, and the movable iron piece 3 incorporated into the lid 9 is provided at the rear end. , the movable iron piece 3 is attracted by the excitation of the electromagnet 2, and the lid 9 is
The printing wire 4 is moved away from the protrusion 18 on the inner surface of the printing wire 4 . The movable iron piece 3 is then returned to its original position by cutting off the excitation action. At this time, the base end of the wire pushes the movable iron piece 3 so that it comes into contact with the protrusion 18 on the inner surface of the lid 9. The lid 9 is fixed to the bracket 1 with a plurality of adjustment screws 11, and the movable iron piece 3 is incorporated through a presser plate 12 fitted on the inner surface of the lid 9. The base end of the movable iron piece 3 and the printing wire 4 are It moves within the gap 13. By adjusting all of the adjustment screws 11, the protrusions 18 can move forward and backward in parallel without inclination, and the positions where all the movable iron pieces 3 contact the base end of the wire can be kept constant.
Reference numeral 14 denotes a rubber ring interposed between the bracket 1 and the base plate 17 attached to the head body 5, and the rubber ring is bent by the aforementioned action. In this way, printing pressure and stroke adjustments can be made outside the head body. In the figure, 2b is the coil of the electromagnet 2, and 15 is the return spring of the printing wire 4, which is received by the collar 10. Reference numeral 16 indicates a heat sink made of aluminum.

[Effects] According to the present invention, it is possible to adjust variations in the contact position between the movable iron piece and the base end of the wire with a simple structure. In particular, in the present invention, since the movable iron piece with a rubber ring is adjusted through the lid with several adjustment screws, the distances between the base ends of all printing wires and all the movable iron pieces are uniform. Adjustment is therefore ensured. That is, the printing pressure of the printing wire becomes uniform, which has the effect of making it possible to print clearly.

[Brief explanation of the drawing]

The drawings show an embodiment of the wire dot printer head according to the present invention, and FIG. 1 is a front view, and FIG. 2 is a sectional view taken along the line A-A' in FIG. 1... Bracket, 2... Electromagnet, 3... Movable iron piece, 4... Printing wire, 5... Head body, 6
...Intermediate guide, 7...Distal guide, 8...Proximal guide, 9...Lid, 11...Adjustment screw, 14...
rubber ring.

Claims (1)

[Claims for Utility Model Registration] A wire dot printer head consisting of a combination of the following three elements (a), (b), and (c). (a) A bracket and a wire guide are provided on the print head body, a plurality of electromagnets are arranged in a ring shape on the bracket, and a rubber ring is interposed on each electromagnet between the bracket and the substrate attached to the print head body; (b) Each movable iron piece in contact with the base end of the printing wire inserted through the wire guide is arranged radially opposite each fixed iron core; (c) The tips of all the movable iron pieces are connected to the lid attached to the print head body. The lid and the bracket are connected to each other by a plurality of adjusting screws arranged concentrically by contacting the protrusion at the center of the inner surface.