JPH0242451Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field The present invention relates to a recording head, and particularly to a recording head in which the magnetic path blocking plate can also serve as a flexible printed circuit board.

(2) Prior Art A sheet is interposed between the clapper and the magnetic circuit to make it easier to separate from the attraction due to residual magnetism and to prevent the clapper from adhering to the coil, yoke, and the magnetic circuit. On the other hand, since the recording head moves in the row direction on the carriage, it is necessary to follow this movement and apply an excitation signal from the head drive circuit to the magnetic drive section. Conventionally, a rigid circuit board is mounted on the coil surface opposite to the magnetic path blocking plate, and an excitation signal is applied to the board via a connector. Therefore,
A magnetic path blocking surface, circuit board, and connector are required.
The number of parts increases and costs rise.

(3) Purpose of the invention The present invention was proposed to solve the above-mentioned disadvantages of the conventional recording head. It uses both a magnetic path blocking plate and a circuit board to reduce the number of parts and achieve an inexpensive recording head. The aim is to propose a head.

(4) Summary of the device This is achieved by printing a circuit for supplying a recording signal to the sheet and using a recording head that directs the sheet as it is to the recording signal supply section.

(5) Embodiments of the invention Next, embodiments of the invention will be described in detail with reference to the attached drawings. In the description of the embodiments, common or similar components are given the same reference numbers and symbols.

FIG. 1 is a sectional view of a wire dot recording head showing a typical embodiment of the present invention. As shown in the figure, the recording head includes a housing 100 that houses a magnetic drive unit that gives a flying force to the recording wire 102 to hit the recording surface, and a nose 2 that is fixed to the housing 100 and houses a guide that guides the recording wire to the recording surface.
00 and a cooling plate 300 that radiates heat generated by the magnetic drive section in the housing 100. Note that 252 is a platen;
54, 256 are recording paper and ink ribbon.

In this embodiment, the housing 100 is equipped with a magnetic drive section consisting of a yoke 104 and a coil 106 that give momentum to the wire 102 to fly toward the recording surface 250, and the magnetic drive section is driven externally according to a recording signal. The wire 102 is made to fly.
Reference numeral 108 denotes a clapper guide, in which a clapper 110 and a clapper presser spring 112 made of a plate spring are housed. Here, the claspper presser spring 112 is an integral spring having a through hole in the center and a radial presser part, and presses the rear end 114 of the claspper 110, causing the clapper 110 to act as a magnetic drive unit formed by the yoke 104 and the coil 106. Creates a fulcrum for movement when rotating in the direction of the arrow in Figure 1 due to the magnetic attraction force. In the initial state (when the magnetic drive section is not energized), the clamper 110 is connected to the presser spring 1.
12 and the force of the return spring 118 of the wire brings its tapered free end side into contact with the stopper 134. Low protrusion 1 of clapper guide 108
09 (FIG. 4) creates a space between the clapper 110 and the clapper guide 108 that allows the clapper 110 to rotate. The magnetic driving part of the yoke 104 and the coil 106, the clapper 110, and the pressing part of the clapper pressing spring 112 are connected to one wire 1.
02, and as will be described later, they are arranged radially at equal intervals around a stopper 134 having a substantially circular cross section.

Figure 2 shows the printing wire 102 and the clapper 11.
FIG. 2 is a plan view showing the arrangement of the main parts of the recording head, such as the magnetic drive section of the yoke 104 and the coil 106. FIG.

First, the wire 102 is placed in the center of the housing 100.
The proximal ends (the side to be struck by the crapper) of nine pieces are arranged concentrically at equal intervals. Coordinated wire 1
02 is held by a guide 120 (FIGS. 1 and 4). Now, let this central portion be 150 (Fig. 4). Approximately triangular clappers 1 are positioned toward the center portion 150 on the clapper guides 108 (their movement in the plane direction is restricted).
An elongated striking portion 111 extends from the main body portion 10 . In addition, on the crapper 110, the crapper 1
A claspper presser spring 112 is mounted on 10 to provide a fulcrum in the rotational direction. This also prevents the rear end of the claspper 110 from lifting up. A magnetic driving section of a yoke 104 and a coil 106, which are driven in accordance with a recording signal applied from the outside, is housed in the housing 100 so as to be located below each clapper 110.

A clapper 110 for striking a wire is arranged radially on the outer periphery of a clapper guide 108 with its base end centered around the wire 102 arranged concentrically, and a yoke 104 is provided below the clapper 110. The magnetic drive unit group of the coil 106 is the wire 1
It is arranged so as to surround the 02 group. Then, as will be described later, the linearly extending wires 102 are gradually converged to create recording rows that are substantially aligned in one line, and the magnetic drive section and the wire drive member can be arranged around the wires without any difficulty.

At the corresponding upper part of the center part 150, there is a notch (center hole) of the clapper guide 108, as will be described later.
A stopper 134, which functions as a collision member, is arranged so as to face through a sheet body 140, which will be described later. Wire 102 struck by clapper 110 struck by stopper 134
A button 116 is fitted to the base end, and a return spring 118 is wound around the button 116. Print wire 1 like this
02 can be made of tungsten with a diameter of 0.3 mm like a normal wire, and is oriented to form a nearly straight line of print on the print surface, with the base end forming a concentric circle. Arranged in intervals. The wire 102 is guided in a straight line through wire guides 120, 122, 124 (FIG. 1);
The dots form a line of dots on the final recording surface. Therefore, as shown in FIG. 3, the wires 102 are not aligned in a single line (straight line) even in the final stage guide 124, and some unevenness remains. However, after passing the guide 124 and reaching the recording surface 20,
When reaching 0, the wires 102 form a printed line 103 aligned in one line. Therefore, the wire 102 does not experience a loss of momentum as it would if it were forced to bend by the guide. Therefore, the magnetic drive section can be made smaller and lighter, and the inertia can be reduced, contributing to high-speed printing.

Figure 3 is a drawing showing from left to right the degree of linear convergence when wire guides are provided in four stages, from the first stage to the fourth stage, which is the final stage. It is shown as. As shown in the figure, a print line 103 arranged in a straight line
The wires 102, which are oriented toward Past recording surface 2
At 50, the printed line 103 is guided to form a line of dots. Wire guide 120-1
24 has guide holes 128 corresponding to the number of wires 102.
The diameter of the guide hole 128 is the same as the diameter of the guide hole when the diameter of the wire 102 is 0.3 mm.
The size can be set to about 0.36 to 0.39 mm, and an appropriate clearance can be provided. Regarding the size of the hole, the guide hole for a wire with a large degree of convergence (indicated by d in the figure showing the first stage) up to the printing surface can be made large, and conversely, the guide hole diameter for a small wire can be made small. Further, the guide hole diameter is related to the thickness of the guide plate, and when the guide plate is thick, it is desirable to provide sufficient clearance for the guide diameter. In this way, the wire guide shown in the example guides the wire in a oriented manner rather than in a curved manner, so compared to a conventional guide that curves the wire, the wire is not subjected to lateral pressure that would impede flight speed. Not affected.

Next, embodiments of the present invention will be described in more detail. As shown in FIG. 2, the circular clapper guide 108 has nine clapper positioning portions 132 on a concentric circle, each independently located within the wall thickness of the clapper guide 108 facing the yoke side. It is recessed in a radial manner. When assembling, use Kratzpar 110
are placed in the positioning portion 132 in the state shown in the figure, and the clapper presser springs 112 extending above the leaves are placed over each clapper 110. Furthermore, if the cooling plate 300 is fixed to the yoke side, the spring force of the claspper presser spring 112 will be applied to the claspper 11.
0 and prevents the clapper 110 from floating up.

Reference numeral 126 is a sheet having a function of preventing residual magnetism, etc., and is sandwiched between the magnetic paths so as to release the magnetic drive section consisting of the yoke 104 and the coil 106 and the clapper 110 from attraction due to residual magnetism. Therefore, when the magnetic driving portions of the yoke 104 and the coil 106 shift from the energized state to the de-energized state, the clapper 110 is released from attraction in a short time. Moreover, this sheet 126 is
It also functions as a member to prevent wear and twisting of the fulcrum part of the 0. Since the sheet 126 is required to have mechanical reliability at high temperatures, a polyimide resin sheet, for example, is used. This sheet 126 has flexibility and durability, and can be used as a substrate material for a flexible printed circuit board. Therefore, the coil 106 is placed on the sheet 126 with the surface facing the clamper 110 removed.
so that the terminal 107 provided on the bobbin 105 comes out. 107' is a soldered portion between the circuit pattern on the sheet 126 and the terminal 107. In this way, the sheet 126 functions as a flexible printed circuit board, and can be directly connected to the head drive circuit 154 (FIG. 5) that drives the magnetic drive unit via the extended flexible printed circuit board without using any auxiliary parts. . Note that the seat 126 is connected to the clapper guide 108 fixed to the yoke 104 from the cooling plate 300 side, and the yoke 10
4. It is held between the magnetic drive section of the coil 106. Wiring for nine magnetic drive units can be formed on one sheet 126.

A wiring diagram of the sheet 126 is shown in FIG. A common power supply line 151 is formed in the center of the circular sheet 126 (near its center hole), and this line 15
Power is supplied to the positive electrode side of each coil from the lead terminal on the upper terminal 107 via one terminal 107. On the other hand, the drive signal line 152 of each wire is used as an excitation signal output from the head drive circuit 154 in accordance with print data to each terminal 152 of the other side of the sheet 126.
7 is input. These excitation signals are connected to the negative pole side of each coil corresponding to each wire, and the wires are driven by exciting the corresponding coil. What is important here is that the terminal 107 should not be exposed below the clapper 110, but should be wired so that the terminal appears outside. The power supply line 151 and the drive signal line 152 excluding the terminal portion are formed to pass under the clapper 110, but in this case, the formed lines may be coated with an insulating resin. Most importantly, it is also possible to form both lines by removing the portions overlapping with the claspper 110.

As shown in FIG.
29,130 are provided. Further, a stopper 134 lined with a metal plate 135 made of iron or the like is fitted in the storage recess 302 in the cooling plate 300 to provide strength, and the stopper 134 is flush with the step 130 due to the step 130. positioned at the same position. In this way, the stopper 134
Since its position is determined by the step 130, a stroke t designed to give an appropriate amount of momentum to the wire 102 can be generated regardless of assembly errors. That is, the stroke t is determined by the depth of the step 130 without being affected by installation errors or requiring adjustment. Reference numbers 136 and 136 indicate a circular notch in the center of the clapper guide 108, and the circumferential surface of the stopper 134 facing from this circular notch 136 is
A clapper 11 that strikes the base end of the wire 102
It forms a collision part of 0. In the embodiment, a suction prevention sheet 140 (described later) is interposed between the clapper 110 and the stopper 134, and the stepped portion 130 directly contacts the stopper 134 through a radial notch in the suction prevention sheet 140. The stroke t is in contact with this adsorption prevention sheet 140.
Determined by considering the thickness of Therefore, the stopper 134 absorbs the impact of the clapper 110 hitting the button 116 that is crowned on the proximal end of the wire 102 and the wire returning with the spring 118.
The stopper 134 used for this purpose is preferably made of low-repulsion rubber, such as plate-shaped butyl rubber. By constructing the stopper 134 from rubber in this manner, transient damped vibrations can be efficiently absorbed, which is also useful for reducing noise. Furthermore, as mentioned above, the stopper 134 is provided with a reinforcing plate (metal plate) for reinforcement purposes.
135, and is further elastically supported by a spring washer 138 (a curved leaf spring) which functions as a member for pressing the entire stopper 134. In this way, the impact can be easily absorbed between the soft and hard parts. Furthermore, since the shock is first received by the rubber, then diffused onto the surface, and then received by the spring washer, stable vibration absorption can be achieved.

As shown in the figure, the spring washer 138 is regulated by the bottom surface of the storage recess 302 in the cooling plate 300. Therefore, the stopper 134 reinforced by the metal plate 135 is connected to the clapper guide 1.
From the second step 130 on the 08 side to the spring washer 1
It is pressed against the second step 130 with an appropriate spring force of 38, and functions as a stopper that abuts the return of the clapper 110 and the wire 102 with an appropriate force while maintaining an accurate stroke t.

In addition, reference number 140 is a sheet body having a shape in which nine tongue pieces extend radially from a circular center onto the clapper 110 so as to cover the entire surface of the stopper 134 and the entire surface of the clapper 108. This sheet 140 prevents the clapper 110 from being adsorbed by the butyl rubber stopper 134, which tends to become sticky. Nomex (trademark of Dupont) can be used as the adsorption prevention sheet 140.

(6) Effects of the invention As described above, according to the invention, one magnetic path blocking plate doubles as a circuit board. Therefore, it is not necessary to provide a separate circuit board, the number of parts is reduced, and the recording head can be supplied at low cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a typical embodiment of the recording head of the present invention, and Fig. 2 shows the main parts of the recording head, such as the printing wire, clapper, clapper guide, yoke, coil, and wiring for the excitation signal supply circuit. 3 is an explanatory diagram showing the degree of convergence by the wire guide; FIG. 4 is an enlarged sectional view of the main parts of the recording head shown in FIG. 1; FIG. 5 is a wiring diagram of a circuit provided on the excitation cutoff sheet. In the figure, 100...Housing, 102...Wire, 104...Yoke, 106...Coil, 10
8... Cratsper guide, 110... Cratsper, 120, 122, 124... Wire guide,
126... Sheet, 127... Coil, 128...
...Guide hole, 129, 130...Stepped, 134...
... stopper, 135 ... reinforcing plate, 138 ... spring washer, 200 ... nose, 300 ... cooling plate, 302 ... storage recess.

Claims (1)

[Claims for Utility Model Registration] (1) A recording head comprising a clapper, a magnetic drive unit that attracts the clapper and causes the wire to fly, and a magnetic path blocking plate interposed between the clapper and the magnetic drive unit, The magnetic path blocking plate is made of a flexible heat-resistant sheet, and a circuit for supplying a recording signal to the magnetic drive section is printed on the sheet,
A recording head characterized in that the sheet is extended and guided to a recording signal supply section. (2) The recording head according to claim 1, wherein the circuit terminal of the magnetic drive unit comes out from the clapper side. (3) The recording head according to claim 2 of the utility model registration, characterized in that the circuit terminal of the magnetic drive section is led out to a portion on the clapper side and does not overlap with the clapper.