JPH041663Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pressure contact structure between a flexible cable and a movable part, which connects a flexible cable to a movable part such as a printed circuit board mounted on a carriage in a printer or the like. It is something.

(Prior Art) Fig. 2 is an exploded perspective view of the printing section of the printer, and Fig. 3 is a perspective view of the main parts of the printer. One end of the motor shaft of this motor protrudes from the upper surface of the carriage frame 1, a pinion 2 is attached to that end, and a driving shaft (not shown) is attached to the other end of the motor shaft. A pinion is attached and faces a roller also provided on the back side, and the roller and pinion allow the vehicle to travel across the rack 3 on the travel path. Carriage frame 1
A printed wiring board 4 is provided on the upper surface of the wiring board 4, and a wiring exposed portion 5 is formed on one side of the printed wiring board 4. A plurality of guide holes 6 are formed to penetrate through the printed wiring board 4 and the carriage frame 1, and are provided on both sides of the wiring exposed portion 5 of the printed wiring board 4.

Reference numeral 7 denotes a ribbon feed mechanism, which is an integrally molded product made of synthetic resin, to which a ribbon case 8 containing an ink ribbon and a gear for winding the ink ribbon is removably attached. The ink ribbon is wound up by the engagement. Ribbon feed mechanism 7
The guide hole 6 of the carriage frame 1 is on the back side of the
A guide protrusion 9 is formed in a protruding manner at a position opposite to. Reference numeral 10 denotes a plurality of locking hooks formed on the lower side of the ribbon feed mechanism 7, which have a V-shaped side surface and are adapted to expand slightly outward due to elasticity.

Reference numeral 11 designates a flexible cable, which has an exposed wiring portion 12 formed at its end, and holes 13 through which the guide protrusions 9 pass are formed on both sides of the exposed wiring portion 12.

Reference numeral 14 designates a mat made of soft synthetic resin for evenly pressing the wiring exposed portion 12 of the flexible cable 11, and is locked to the guide protrusion 9 through a locking hole 15.

Next, the assembly operation of the above structure will be explained step by step.

The mat 14 is fitted in advance to the guide protrusion 9 of the ribbon feed mechanism 7 through the locking hole 15.

Therefore, when the holes 13 of the flexible cable 11 are aligned with the guide holes 6 of the carriage frame 1 and the ribbon feed mechanism 7 is stacked from above, the guide protrusions 9 are guided and inserted into the respective guide holes 6. At this time, at the same time, the hook 10 expands to the side edge of the carriage frame 1 and locks with the L-shaped end locking part, and the ribbon feed mechanism 7 is attached to the carriage frame 1. They are locked together, and the flexible cable 11 is also fixed at the same time, so that the wiring exposed portions 5 and 12 of the printed wiring board 4 and the flexible cable 11 are overlapped and electrically connected. At this time, pressure is applied to the exposed wiring portions 5 and 12 via the mat 14, thereby ensuring good electrical connection.

The shape of the contact surface of the mat 14 of the ribbon feed mechanism 7 may be flat, or as shown in FIG.
A protrusion 7' shown in the figure is provided.

(Problem to be solved by the invention) However, if the shape of the pressurizing part of a pressurizing member such as a ribbon feed mechanism is flat and pressure is applied to the exposed wiring part through the mat, the pressure will be applied to the flexible cable. There was a problem in that the pressure was distributed over the entire area, and insufficient pressure was applied to the most important exposed wiring, resulting in poor connection.

In addition, if the shape of the pressurizing part is not flat as described above but is shaped so that the part corresponding to the wiring in the exposed wiring part protrudes, the pressure on the wiring in the exposed wiring part will be greater than when it is flat. However, since the pressure is still concentrated through the mat, the pressure is actually dispersed on the upper surface of the exposed wiring portion of the flexible cable, resulting in the problem of poor connection as described above.

Another problem is that when the movable parts move, bending stress is concentrated near the connection between the flexible cable and the movable part, and as a result, the wiring near the connection between the flexible cable and the movable part is more likely to break. It was hot.

The present invention solves the problems of the conventional technology in that insufficient pressure is applied to the exposed portion of the wiring, resulting in poor connection, and the problem that the wiring near the connection between the flexible cable and the movable part is prone to breakage. The present invention solves this problem and provides a highly reliable press-contact structure between a flexible cable and a movable part.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention arranges a flexible film piece between a flexible cable and an elastic member, and one end of the film piece is connected to the flexible cable. A plurality of slit holes are provided in areas other than the exposed wiring part of the flexible cable so that the film parts do not overlap, one end of this film piece is overlapped and fixed to the exposed wiring part of the flexible cable, and the other end of the film piece is fixed to the free end. The flexible cable is protruded in the folding direction.

(Function) According to the present invention, the pressure generated by the deformation of the elastic member is concentrated on the wiring part of the exposed wiring part of the flexible cable through the film member due to the slit hole provided at one end of the film. Furthermore, the above-mentioned problem can be eliminated by making the other end of the film piece a free end and protruding in the folding direction of the flexible cable.

(Example) FIG. 1 is a sectional view of a flexible cable press-connecting part, and FIG. 6 is a mounting diagram of a film piece. In FIG. 1, reference numeral 17 denotes a film piece, which, as shown in FIG. 6, has an outer shape substantially the same as the wiring exposed portion 12 shown in FIG. A hole 18 is drilled through it. Further, a plurality of slit holes 19 are provided between the holes. However, this slit hole 19 is provided so that when the hole 18 of the film piece and the hole 13 of the flexible cable 11 are matched, it is located between the wires of the exposed wire portion 12 and close to and outside the wires at both ends. There is. That is, when this film piece 17 is superimposed on the flexible cable 11, the film part of the film piece 17 is present on the wiring of the flexible cable 11 at least in the wiring part A where the slit hole 19 is provided.
Therefore, when the flexible cable 11, the film piece 17, and the mat 14 are sequentially stacked on the printed wiring board 4 as shown in FIG. It will be distributed in areas other than the hole 19. As a result, pressure is concentrated on the wiring in the exposed wiring portion 12 of the flexible cable 11.

Furthermore, the other end of the film piece 17 has a protrusion B that protrudes in the folding direction of the flexible cable 11. When the flexible cable 11 is pressure-connected using this film piece 17, even if the flexible cable 11 repeatedly bends, the upward bending of the flexible cable is suppressed by the protrusion B of the film piece 17, and the flexible cable is gently bent. As a result, bending stress near the connection portion with the movable part is suppressed, and therefore, disconnection of the wiring near the connection portion becomes less likely to occur. Note that the protrusion B has a free end.

(Effects of the invention) As explained above in detail, according to the invention,
A flexible film piece is arranged between the flexible cable and the elastic member, and one end of the film piece is provided with a plurality of slit holes so that the film part does not overlap with the part other than the exposed wiring part of the flexible cable. Since one end of this film piece is fixed by overlapping the exposed wiring part of the flexible cable, the pressure generated by the deformation of the elastic member can be concentrated on the exposed wiring part of the flexible cable via the film member, thereby reducing the pressure contact force. This has the effect of increasing the reliability of pressure welding of flexible cables. Furthermore, since the other end of the film piece is made to be a free end and protrudes in the folding direction of the flexible cable, even if the flexible cable is repeatedly bent when the moving part moves, the wiring near the connection with the moving part will not be affected. This has the effect of making wire breakage less likely to occur.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a flexible cable pressure welding section showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the printing section of the printer, Fig. 3 is a perspective view of the main parts of the printer, and Fig. 4 is a conventional flexible cable. FIG. 5 is a partial side view of FIG. 4, and FIG. 6 is a mounting diagram of the film piece. 4...Printed wiring board, 11...Flexible cable, 14...Matsu, 17...Film piece.

Claims (1)

[Scope of utility model registration request] A flexible film piece is arranged between the flexible cable and the elastic member, and one end of the film piece is provided with a plurality of slit holes so that the film part does not overlap with the part other than the exposed wiring part of the flexible cable. A flexible cable and a movable part, characterized in that one end of the film piece is overlapped and fixed on the exposed wiring part of the flexible cable, and the other end of the film piece is made to protrude as a free end in the folding direction of the flexible cable. pressure welding structure.